chain.c 135 KB
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/*
 * Copyright 2006 Juan Lang
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 */
#include <stdarg.h>
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#define NONAMELESSUNION
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#include "windef.h"
#include "winbase.h"
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#define CERT_CHAIN_PARA_HAS_EXTRA_FIELDS
#define CERT_REVOCATION_PARA_HAS_EXTRA_FIELDS
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#include "wincrypt.h"
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#include "wininet.h"
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#include "wine/debug.h"
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#include "wine/unicode.h"
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#include "crypt32_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(crypt);
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WINE_DECLARE_DEBUG_CHANNEL(chain);
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#define DEFAULT_CYCLE_MODULUS 7

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static HCERTCHAINENGINE CRYPT_defaultChainEngine;

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/* This represents a subset of a certificate chain engine:  it doesn't include
 * the "hOther" store described by MSDN, because I'm not sure how that's used.
 * It also doesn't include the "hTrust" store, because I don't yet implement
 * CTLs or complex certificate chains.
 */
typedef struct _CertificateChainEngine
{
    LONG       ref;
    HCERTSTORE hRoot;
    HCERTSTORE hWorld;
    DWORD      dwFlags;
    DWORD      dwUrlRetrievalTimeout;
    DWORD      MaximumCachedCertificates;
    DWORD      CycleDetectionModulus;
} CertificateChainEngine, *PCertificateChainEngine;

static inline void CRYPT_AddStoresToCollection(HCERTSTORE collection,
 DWORD cStores, HCERTSTORE *stores)
{
    DWORD i;

    for (i = 0; i < cStores; i++)
        CertAddStoreToCollection(collection, stores[i], 0, 0);
}

static inline void CRYPT_CloseStores(DWORD cStores, HCERTSTORE *stores)
{
    DWORD i;

    for (i = 0; i < cStores; i++)
        CertCloseStore(stores[i], 0);
}

static const WCHAR rootW[] = { 'R','o','o','t',0 };

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/* Finds cert in store by comparing the cert's hashes. */
static PCCERT_CONTEXT CRYPT_FindCertInStore(HCERTSTORE store,
 PCCERT_CONTEXT cert)
{
    PCCERT_CONTEXT matching = NULL;
    BYTE hash[20];
    DWORD size = sizeof(hash);

    if (CertGetCertificateContextProperty(cert, CERT_HASH_PROP_ID, hash, &size))
    {
        CRYPT_HASH_BLOB blob = { sizeof(hash), hash };

        matching = CertFindCertificateInStore(store, cert->dwCertEncodingType,
         0, CERT_FIND_SHA1_HASH, &blob, NULL);
    }
    return matching;
}

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static BOOL CRYPT_CheckRestrictedRoot(HCERTSTORE store)
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{
    BOOL ret = TRUE;

    if (store)
    {
        HCERTSTORE rootStore = CertOpenSystemStoreW(0, rootW);
        PCCERT_CONTEXT cert = NULL, check;

        do {
            cert = CertEnumCertificatesInStore(store, cert);
            if (cert)
            {
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                if (!(check = CRYPT_FindCertInStore(rootStore, cert)))
                    ret = FALSE;
                else
                    CertFreeCertificateContext(check);
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            }
        } while (ret && cert);
        if (cert)
            CertFreeCertificateContext(cert);
        CertCloseStore(rootStore, 0);
    }
    return ret;
}

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HCERTCHAINENGINE CRYPT_CreateChainEngine(HCERTSTORE root,
 PCERT_CHAIN_ENGINE_CONFIG pConfig)
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{
    static const WCHAR caW[] = { 'C','A',0 };
    static const WCHAR myW[] = { 'M','y',0 };
    static const WCHAR trustW[] = { 'T','r','u','s','t',0 };
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    PCertificateChainEngine engine =
     CryptMemAlloc(sizeof(CertificateChainEngine));

    if (engine)
    {
        HCERTSTORE worldStores[4];

        engine->ref = 1;
        engine->hRoot = root;
        engine->hWorld = CertOpenStore(CERT_STORE_PROV_COLLECTION, 0, 0,
         CERT_STORE_CREATE_NEW_FLAG, NULL);
        worldStores[0] = CertDuplicateStore(engine->hRoot);
        worldStores[1] = CertOpenSystemStoreW(0, caW);
        worldStores[2] = CertOpenSystemStoreW(0, myW);
        worldStores[3] = CertOpenSystemStoreW(0, trustW);
        CRYPT_AddStoresToCollection(engine->hWorld,
         sizeof(worldStores) / sizeof(worldStores[0]), worldStores);
        CRYPT_AddStoresToCollection(engine->hWorld,
         pConfig->cAdditionalStore, pConfig->rghAdditionalStore);
        CRYPT_CloseStores(sizeof(worldStores) / sizeof(worldStores[0]),
         worldStores);
        engine->dwFlags = pConfig->dwFlags;
        engine->dwUrlRetrievalTimeout = pConfig->dwUrlRetrievalTimeout;
        engine->MaximumCachedCertificates =
         pConfig->MaximumCachedCertificates;
        if (pConfig->CycleDetectionModulus)
            engine->CycleDetectionModulus = pConfig->CycleDetectionModulus;
        else
            engine->CycleDetectionModulus = DEFAULT_CYCLE_MODULUS;
    }
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    return engine;
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}

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typedef struct _CERT_CHAIN_ENGINE_CONFIG_NO_EXCLUSIVE_ROOT
{
    DWORD       cbSize;
    HCERTSTORE  hRestrictedRoot;
    HCERTSTORE  hRestrictedTrust;
    HCERTSTORE  hRestrictedOther;
    DWORD       cAdditionalStore;
    HCERTSTORE *rghAdditionalStore;
    DWORD       dwFlags;
    DWORD       dwUrlRetrievalTimeout;
    DWORD       MaximumCachedCertificates;
    DWORD       CycleDetectionModulus;
} CERT_CHAIN_ENGINE_CONFIG_NO_EXCLUSIVE_ROOT;

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BOOL WINAPI CertCreateCertificateChainEngine(PCERT_CHAIN_ENGINE_CONFIG pConfig,
 HCERTCHAINENGINE *phChainEngine)
{
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    BOOL ret;

    TRACE("(%p, %p)\n", pConfig, phChainEngine);

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    if (pConfig->cbSize != sizeof(CERT_CHAIN_ENGINE_CONFIG_NO_EXCLUSIVE_ROOT)
     && pConfig->cbSize != sizeof(CERT_CHAIN_ENGINE_CONFIG))
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    {
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
    *phChainEngine = NULL;
    ret = CRYPT_CheckRestrictedRoot(pConfig->hRestrictedRoot);
    if (ret)
    {
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        HCERTSTORE root;
        HCERTCHAINENGINE engine;
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        if (pConfig->cbSize >= sizeof(CERT_CHAIN_ENGINE_CONFIG) &&
         pConfig->hExclusiveRoot)
            root = CertDuplicateStore(pConfig->hExclusiveRoot);
        else if (pConfig->hRestrictedRoot)
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            root = CertDuplicateStore(pConfig->hRestrictedRoot);
        else
            root = CertOpenSystemStoreW(0, rootW);
        engine = CRYPT_CreateChainEngine(root, pConfig);
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        if (engine)
        {
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            *phChainEngine = engine;
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            ret = TRUE;
        }
        else
            ret = FALSE;
    }
    return ret;
}

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VOID WINAPI CertFreeCertificateChainEngine(HCERTCHAINENGINE hChainEngine)
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{
    PCertificateChainEngine engine = (PCertificateChainEngine)hChainEngine;

    TRACE("(%p)\n", hChainEngine);

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    if (engine && InterlockedDecrement(&engine->ref) == 0)
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    {
        CertCloseStore(engine->hWorld, 0);
        CertCloseStore(engine->hRoot, 0);
        CryptMemFree(engine);
    }
}
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static HCERTCHAINENGINE CRYPT_GetDefaultChainEngine(void)
{
    if (!CRYPT_defaultChainEngine)
    {
        CERT_CHAIN_ENGINE_CONFIG config = { 0 };
        HCERTCHAINENGINE engine;

        config.cbSize = sizeof(config);
        CertCreateCertificateChainEngine(&config, &engine);
        InterlockedCompareExchangePointer(&CRYPT_defaultChainEngine, engine,
         NULL);
        if (CRYPT_defaultChainEngine != engine)
            CertFreeCertificateChainEngine(engine);
    }
    return CRYPT_defaultChainEngine;
}

void default_chain_engine_free(void)
{
    CertFreeCertificateChainEngine(CRYPT_defaultChainEngine);
}

typedef struct _CertificateChain
{
    CERT_CHAIN_CONTEXT context;
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    HCERTSTORE world;
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    LONG ref;
} CertificateChain, *PCertificateChain;

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static BOOL CRYPT_IsCertificateSelfSigned(PCCERT_CONTEXT cert)
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{
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    PCERT_EXTENSION ext;
    DWORD size;
    BOOL ret;

    if ((ext = CertFindExtension(szOID_AUTHORITY_KEY_IDENTIFIER2,
     cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
    {
        CERT_AUTHORITY_KEY_ID2_INFO *info;

        ret = CryptDecodeObjectEx(cert->dwCertEncodingType,
         X509_AUTHORITY_KEY_ID2, ext->Value.pbData, ext->Value.cbData,
         CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
         &info, &size);
        if (ret)
        {
            if (info->AuthorityCertIssuer.cAltEntry &&
             info->AuthorityCertSerialNumber.cbData)
            {
                PCERT_ALT_NAME_ENTRY directoryName = NULL;
                DWORD i;

                for (i = 0; !directoryName &&
                 i < info->AuthorityCertIssuer.cAltEntry; i++)
                    if (info->AuthorityCertIssuer.rgAltEntry[i].dwAltNameChoice
                     == CERT_ALT_NAME_DIRECTORY_NAME)
                        directoryName =
                         &info->AuthorityCertIssuer.rgAltEntry[i];
                if (directoryName)
                {
                    ret = CertCompareCertificateName(cert->dwCertEncodingType,
                     &directoryName->u.DirectoryName, &cert->pCertInfo->Issuer)
                     && CertCompareIntegerBlob(&info->AuthorityCertSerialNumber,
                     &cert->pCertInfo->SerialNumber);
                }
                else
                {
                    FIXME("no supported name type in authority key id2\n");
                    ret = FALSE;
                }
            }
            else if (info->KeyId.cbData)
            {
                ret = CertGetCertificateContextProperty(cert,
                 CERT_KEY_IDENTIFIER_PROP_ID, NULL, &size);
                if (ret && size == info->KeyId.cbData)
                {
                    LPBYTE buf = CryptMemAlloc(size);

                    if (buf)
                    {
                        CertGetCertificateContextProperty(cert,
                         CERT_KEY_IDENTIFIER_PROP_ID, buf, &size);
                        ret = !memcmp(buf, info->KeyId.pbData, size);
                        CryptMemFree(buf);
                    }
                }
                else
                    ret = FALSE;
            }
            LocalFree(info);
        }
    }
    else if ((ext = CertFindExtension(szOID_AUTHORITY_KEY_IDENTIFIER,
     cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
    {
        CERT_AUTHORITY_KEY_ID_INFO *info;

        ret = CryptDecodeObjectEx(cert->dwCertEncodingType,
         X509_AUTHORITY_KEY_ID, ext->Value.pbData, ext->Value.cbData,
         CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
         &info, &size);
        if (ret)
        {
            if (info->CertIssuer.cbData && info->CertSerialNumber.cbData)
            {
                ret = CertCompareCertificateName(cert->dwCertEncodingType,
                 &info->CertIssuer, &cert->pCertInfo->Issuer) &&
                 CertCompareIntegerBlob(&info->CertSerialNumber,
                 &cert->pCertInfo->SerialNumber);
            }
            else if (info->KeyId.cbData)
            {
                ret = CertGetCertificateContextProperty(cert,
                 CERT_KEY_IDENTIFIER_PROP_ID, NULL, &size);
                if (ret && size == info->KeyId.cbData)
                {
                    LPBYTE buf = CryptMemAlloc(size);

                    if (buf)
                    {
                        CertGetCertificateContextProperty(cert,
                         CERT_KEY_IDENTIFIER_PROP_ID, buf, &size);
                        ret = !memcmp(buf, info->KeyId.pbData, size);
                        CryptMemFree(buf);
                    }
                    else
                        ret = FALSE;
                }
                else
                    ret = FALSE;
            }
            else
                ret = FALSE;
            LocalFree(info);
        }
    }
    else
        ret = CertCompareCertificateName(cert->dwCertEncodingType,
         &cert->pCertInfo->Subject, &cert->pCertInfo->Issuer);
    return ret;
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}

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static void CRYPT_FreeChainElement(PCERT_CHAIN_ELEMENT element)
{
    CertFreeCertificateContext(element->pCertContext);
    CryptMemFree(element);
}

static void CRYPT_CheckSimpleChainForCycles(PCERT_SIMPLE_CHAIN chain)
{
    DWORD i, j, cyclicCertIndex = 0;

    /* O(n^2) - I don't think there's a faster way */
    for (i = 0; !cyclicCertIndex && i < chain->cElement; i++)
        for (j = i + 1; !cyclicCertIndex && j < chain->cElement; j++)
            if (CertCompareCertificate(X509_ASN_ENCODING,
             chain->rgpElement[i]->pCertContext->pCertInfo,
             chain->rgpElement[j]->pCertContext->pCertInfo))
                cyclicCertIndex = j;
    if (cyclicCertIndex)
    {
        chain->rgpElement[cyclicCertIndex]->TrustStatus.dwErrorStatus
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         |= CERT_TRUST_IS_CYCLIC | CERT_TRUST_INVALID_BASIC_CONSTRAINTS;
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        /* Release remaining certs */
        for (i = cyclicCertIndex + 1; i < chain->cElement; i++)
            CRYPT_FreeChainElement(chain->rgpElement[i]);
        /* Truncate chain */
        chain->cElement = cyclicCertIndex + 1;
    }
}

/* Checks whether the chain is cyclic by examining the last element's status */
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static inline BOOL CRYPT_IsSimpleChainCyclic(const CERT_SIMPLE_CHAIN *chain)
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{
    if (chain->cElement)
        return chain->rgpElement[chain->cElement - 1]->TrustStatus.dwErrorStatus
         & CERT_TRUST_IS_CYCLIC;
    else
        return FALSE;
}

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static inline void CRYPT_CombineTrustStatus(CERT_TRUST_STATUS *chainStatus,
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 const CERT_TRUST_STATUS *elementStatus)
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{
    /* Any error that applies to an element also applies to a chain.. */
    chainStatus->dwErrorStatus |= elementStatus->dwErrorStatus;
    /* but the bottom nibble of an element's info status doesn't apply to the
     * chain.
     */
    chainStatus->dwInfoStatus |= (elementStatus->dwInfoStatus & 0xfffffff0);
}

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static BOOL CRYPT_AddCertToSimpleChain(const CertificateChainEngine *engine,
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 PCERT_SIMPLE_CHAIN chain, PCCERT_CONTEXT cert, DWORD subjectInfoStatus)
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{
    BOOL ret = FALSE;
    PCERT_CHAIN_ELEMENT element = CryptMemAlloc(sizeof(CERT_CHAIN_ELEMENT));

    if (element)
    {
        if (!chain->cElement)
            chain->rgpElement = CryptMemAlloc(sizeof(PCERT_CHAIN_ELEMENT));
        else
            chain->rgpElement = CryptMemRealloc(chain->rgpElement,
             (chain->cElement + 1) * sizeof(PCERT_CHAIN_ELEMENT));
        if (chain->rgpElement)
        {
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            chain->rgpElement[chain->cElement++] = element;
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            memset(element, 0, sizeof(CERT_CHAIN_ELEMENT));
            element->cbSize = sizeof(CERT_CHAIN_ELEMENT);
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            element->pCertContext = CertDuplicateCertificateContext(cert);
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            if (chain->cElement > 1)
                chain->rgpElement[chain->cElement - 2]->TrustStatus.dwInfoStatus
                 = subjectInfoStatus;
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            /* FIXME: initialize the rest of element */
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            if (!(chain->cElement % engine->CycleDetectionModulus))
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            {
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                CRYPT_CheckSimpleChainForCycles(chain);
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                /* Reinitialize the element pointer in case the chain is
                 * cyclic, in which case the chain is truncated.
                 */
                element = chain->rgpElement[chain->cElement - 1];
            }
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            CRYPT_CombineTrustStatus(&chain->TrustStatus,
             &element->TrustStatus);
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            ret = TRUE;
        }
        else
            CryptMemFree(element);
    }
    return ret;
}

static void CRYPT_FreeSimpleChain(PCERT_SIMPLE_CHAIN chain)
{
    DWORD i;

    for (i = 0; i < chain->cElement; i++)
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        CRYPT_FreeChainElement(chain->rgpElement[i]);
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    CryptMemFree(chain->rgpElement);
    CryptMemFree(chain);
}

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static void CRYPT_CheckTrustedStatus(HCERTSTORE hRoot,
 PCERT_CHAIN_ELEMENT rootElement)
{
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    PCCERT_CONTEXT trustedRoot = CRYPT_FindCertInStore(hRoot,
     rootElement->pCertContext);

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    if (!trustedRoot)
        rootElement->TrustStatus.dwErrorStatus |=
         CERT_TRUST_IS_UNTRUSTED_ROOT;
    else
        CertFreeCertificateContext(trustedRoot);
}

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static void CRYPT_CheckRootCert(HCERTCHAINENGINE hRoot,
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 PCERT_CHAIN_ELEMENT rootElement)
{
    PCCERT_CONTEXT root = rootElement->pCertContext;

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    if (!CryptVerifyCertificateSignatureEx(0, root->dwCertEncodingType,
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     CRYPT_VERIFY_CERT_SIGN_SUBJECT_CERT, (void *)root,
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     CRYPT_VERIFY_CERT_SIGN_ISSUER_CERT, (void *)root, 0, NULL))
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    {
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        TRACE_(chain)("Last certificate's signature is invalid\n");
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        rootElement->TrustStatus.dwErrorStatus |=
         CERT_TRUST_IS_NOT_SIGNATURE_VALID;
    }
    CRYPT_CheckTrustedStatus(hRoot, rootElement);
}

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/* Decodes a cert's basic constraints extension (either szOID_BASIC_CONSTRAINTS
 * or szOID_BASIC_CONSTRAINTS2, whichever is present) into a
 * CERT_BASIC_CONSTRAINTS2_INFO.  If it neither extension is present, sets
 * constraints->fCA to defaultIfNotSpecified.
 * Returns FALSE if the extension is present but couldn't be decoded.
 */
static BOOL CRYPT_DecodeBasicConstraints(PCCERT_CONTEXT cert,
 CERT_BASIC_CONSTRAINTS2_INFO *constraints, BOOL defaultIfNotSpecified)
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{
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    BOOL ret = TRUE;
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    PCERT_EXTENSION ext = CertFindExtension(szOID_BASIC_CONSTRAINTS,
     cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension);

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    constraints->fPathLenConstraint = FALSE;
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    if (ext)
    {
        CERT_BASIC_CONSTRAINTS_INFO *info;
        DWORD size = 0;

        ret = CryptDecodeObjectEx(X509_ASN_ENCODING, szOID_BASIC_CONSTRAINTS,
         ext->Value.pbData, ext->Value.cbData, CRYPT_DECODE_ALLOC_FLAG,
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         NULL, &info, &size);
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        if (ret)
        {
            if (info->SubjectType.cbData == 1)
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                constraints->fCA =
                 info->SubjectType.pbData[0] & CERT_CA_SUBJECT_FLAG;
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            LocalFree(info);
        }
    }
    else
    {
        ext = CertFindExtension(szOID_BASIC_CONSTRAINTS2,
         cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension);
        if (ext)
        {
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            DWORD size = sizeof(CERT_BASIC_CONSTRAINTS2_INFO);
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            ret = CryptDecodeObjectEx(X509_ASN_ENCODING,
             szOID_BASIC_CONSTRAINTS2, ext->Value.pbData, ext->Value.cbData,
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             0, NULL, constraints, &size);
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        }
        else
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            constraints->fCA = defaultIfNotSpecified;
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    }
    return ret;
}

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/* Checks element's basic constraints to see if it can act as a CA, with
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 * remainingCAs CAs left in this chain.  In general, a cert must include the
 * basic constraints extension, with the CA flag asserted, in order to be
 * allowed to be a CA.  A V1 or V2 cert, which has no extensions, is also
 * allowed to be a CA if it's installed locally (in the engine's world store.)
 * This matches the expected usage in RFC 5280, section 4.2.1.9:  a conforming
 * CA MUST include the basic constraints extension in all certificates that are
 * used to validate digital signatures on certificates.  It also matches
 * section 6.1.4(k): "If a certificate is a v1 or v2 certificate, then the
 * application MUST either verify that the certificate is a CA certificate
 * through out-of-band means or reject the certificate." Rejecting the
 * certificate prohibits a large number of commonly used certificates, so
 * accepting locally installed ones is a compromise.
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 * Root certificates are also allowed to be CAs even without a basic
 * constraints extension.  This is implied by RFC 5280, section 6.1:  the
 * root of a certificate chain's only requirement is that it was used to issue
 * the next certificate in the chain.
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 * Updates chainConstraints with the element's constraints, if:
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 * 1. chainConstraints doesn't have a path length constraint, or
 * 2. element's path length constraint is smaller than chainConstraints's
 * Sets *pathLengthConstraintViolated to TRUE if a path length violation
 * occurs.
 * Returns TRUE if the element can be a CA, and the length of the remaining
 * chain is valid.
 */
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static BOOL CRYPT_CheckBasicConstraintsForCA(PCertificateChainEngine engine,
 PCCERT_CONTEXT cert, CERT_BASIC_CONSTRAINTS2_INFO *chainConstraints,
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 DWORD remainingCAs, BOOL isRoot, BOOL *pathLengthConstraintViolated)
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{
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    BOOL validBasicConstraints, implicitCA = FALSE;
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    CERT_BASIC_CONSTRAINTS2_INFO constraints;

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    if (isRoot)
        implicitCA = TRUE;
    else if (cert->pCertInfo->dwVersion == CERT_V1 ||
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     cert->pCertInfo->dwVersion == CERT_V2)
    {
        BYTE hash[20];
        DWORD size = sizeof(hash);

        if (CertGetCertificateContextProperty(cert, CERT_HASH_PROP_ID,
         hash, &size))
        {
            CRYPT_HASH_BLOB blob = { sizeof(hash), hash };
            PCCERT_CONTEXT localCert = CertFindCertificateInStore(
             engine->hWorld, cert->dwCertEncodingType, 0, CERT_FIND_SHA1_HASH,
             &blob, NULL);

            if (localCert)
            {
                CertFreeCertificateContext(localCert);
                implicitCA = TRUE;
            }
        }
    }
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    if ((validBasicConstraints = CRYPT_DecodeBasicConstraints(cert,
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     &constraints, implicitCA)))
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    {
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        chainConstraints->fCA = constraints.fCA;
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        if (!constraints.fCA)
        {
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            TRACE_(chain)("chain element %d can't be a CA\n", remainingCAs + 1);
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            validBasicConstraints = FALSE;
        }
        else if (constraints.fPathLenConstraint)
        {
            /* If the element has path length constraints, they apply to the
             * entire remaining chain.
             */
            if (!chainConstraints->fPathLenConstraint ||
             constraints.dwPathLenConstraint <
             chainConstraints->dwPathLenConstraint)
            {
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                TRACE_(chain)("setting path length constraint to %d\n",
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                 chainConstraints->dwPathLenConstraint);
                chainConstraints->fPathLenConstraint = TRUE;
                chainConstraints->dwPathLenConstraint =
                 constraints.dwPathLenConstraint;
            }
        }
    }
    if (chainConstraints->fPathLenConstraint &&
     remainingCAs > chainConstraints->dwPathLenConstraint)
    {
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        TRACE_(chain)("remaining CAs %d exceed max path length %d\n",
         remainingCAs, chainConstraints->dwPathLenConstraint);
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        validBasicConstraints = FALSE;
        *pathLengthConstraintViolated = TRUE;
    }
    return validBasicConstraints;
}

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static BOOL domain_name_matches(LPCWSTR constraint, LPCWSTR name)
{
    BOOL match;

    /* RFC 5280, section 4.2.1.10:
     * "For URIs, the constraint applies to the host part of the name...
     *  When the constraint begins with a period, it MAY be expanded with one
     *  or more labels.  That is, the constraint ".example.com" is satisfied by
     *  both host.example.com and my.host.example.com.  However, the constraint
     *  ".example.com" is not satisfied by "example.com".  When the constraint
     *  does not begin with a period, it specifies a host."
     * and for email addresses,
     * "To indicate all Internet mail addresses on a particular host, the
     *  constraint is specified as the host name.  For example, the constraint
     *  "example.com" is satisfied by any mail address at the host
     *  "example.com".  To specify any address within a domain, the constraint
     *  is specified with a leading period (as with URIs)."
     */
    if (constraint[0] == '.')
    {
        /* Must be strictly greater than, a name can't begin with '.' */
        if (lstrlenW(name) > lstrlenW(constraint))
            match = !lstrcmpiW(name + lstrlenW(name) - lstrlenW(constraint),
             constraint);
        else
        {
            /* name is too short, no match */
            match = FALSE;
        }
    }
    else
        match = !lstrcmpiW(name, constraint);
     return match;
}

671 672 673 674 675 676 677 678 679 680 681
static BOOL url_matches(LPCWSTR constraint, LPCWSTR name,
 DWORD *trustErrorStatus)
{
    BOOL match = FALSE;

    TRACE("%s, %s\n", debugstr_w(constraint), debugstr_w(name));

    if (!constraint)
        *trustErrorStatus |= CERT_TRUST_INVALID_NAME_CONSTRAINTS;
    else if (!name)
        ; /* no match */
682
    else
683
    {
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
        LPCWSTR colon, authority_end, at, hostname = NULL;
        /* The maximum length for a hostname is 254 in the DNS, see RFC 1034 */
        WCHAR hostname_buf[255];

        /* RFC 5280: only the hostname portion of the URL is compared.  From
         * section 4.2.1.10:
         * "For URIs, the constraint applies to the host part of the name.
         *  The constraint MUST be specified as a fully qualified domain name
         *  and MAY specify a host or a domain."
         * The format for URIs is in RFC 2396.
         *
         * First, remove any scheme that's present. */
        colon = strchrW(name, ':');
        if (colon && *(colon + 1) == '/' && *(colon + 2) == '/')
            name = colon + 3;
        /* Next, find the end of the authority component.  (The authority is
         * generally just the hostname, but it may contain a username or a port.
         * Those are removed next.)
         */
        authority_end = strchrW(name, '/');
        if (!authority_end)
            authority_end = strchrW(name, '?');
        if (!authority_end)
            authority_end = name + strlenW(name);
708 709 710 711 712 713
        /* Remove any port number from the authority.  The userinfo portion
         * of an authority may contain a colon, so stop if a userinfo portion
         * is found (indicated by '@').
         */
        for (colon = authority_end; colon >= name && *colon != ':' &&
         *colon != '@'; colon--)
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735
            ;
        if (*colon == ':')
            authority_end = colon;
        /* Remove any username from the authority */
        if ((at = strchrW(name, '@')))
            name = at;
        /* Ignore any path or query portion of the URL. */
        if (*authority_end)
        {
            if (authority_end - name < sizeof(hostname_buf) /
             sizeof(hostname_buf[0]))
            {
                memcpy(hostname_buf, name,
                 (authority_end - name) * sizeof(WCHAR));
                hostname_buf[authority_end - name] = 0;
                hostname = hostname_buf;
            }
            /* else: Hostname is too long, not a match */
        }
        else
            hostname = name;
        if (hostname)
736
            match = domain_name_matches(constraint, hostname);
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
    }
    return match;
}

static BOOL rfc822_name_matches(LPCWSTR constraint, LPCWSTR name,
 DWORD *trustErrorStatus)
{
    BOOL match = FALSE;
    LPCWSTR at;

    TRACE("%s, %s\n", debugstr_w(constraint), debugstr_w(name));

    if (!constraint)
        *trustErrorStatus |= CERT_TRUST_INVALID_NAME_CONSTRAINTS;
    else if (!name)
        ; /* no match */
753
    else if (strchrW(constraint, '@'))
754 755 756 757
        match = !lstrcmpiW(constraint, name);
    else
    {
        if ((at = strchrW(name, '@')))
758
            match = domain_name_matches(constraint, at + 1);
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775
        else
            match = !lstrcmpiW(constraint, name);
    }
    return match;
}

static BOOL dns_name_matches(LPCWSTR constraint, LPCWSTR name,
 DWORD *trustErrorStatus)
{
    BOOL match = FALSE;

    TRACE("%s, %s\n", debugstr_w(constraint), debugstr_w(name));

    if (!constraint)
        *trustErrorStatus |= CERT_TRUST_INVALID_NAME_CONSTRAINTS;
    else if (!name)
        ; /* no match */
776 777 778 779 780 781 782 783 784 785 786
    /* RFC 5280, section 4.2.1.10:
     * "DNS name restrictions are expressed as host.example.com.  Any DNS name
     *  that can be constructed by simply adding zero or more labels to the
     *  left-hand side of the name satisfies the name constraint.  For example,
     *  www.host.example.com would satisfy the constraint but host1.example.com
     *  would not."
     */
    else if (lstrlenW(name) == lstrlenW(constraint))
        match = !lstrcmpiW(name, constraint);
    else if (lstrlenW(name) > lstrlenW(constraint))
    {
787 788
        match = !lstrcmpiW(name + lstrlenW(name) - lstrlenW(constraint),
         constraint);
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
        if (match)
        {
            BOOL dot = FALSE;
            LPCWSTR ptr;

            /* This only matches if name is a subdomain of constraint, i.e.
             * there's a '.' between the beginning of the name and the
             * matching portion of the name.
             */
            for (ptr = name + lstrlenW(name) - lstrlenW(constraint);
             !dot && ptr >= name; ptr--)
                if (*ptr == '.')
                    dot = TRUE;
            match = dot;
        }
    }
805 806
    /* else:  name is too short, no match */

807 808 809 810 811 812 813 814 815 816 817
    return match;
}

static BOOL ip_address_matches(const CRYPT_DATA_BLOB *constraint,
 const CRYPT_DATA_BLOB *name, DWORD *trustErrorStatus)
{
    BOOL match = FALSE;

    TRACE("(%d, %p), (%d, %p)\n", constraint->cbData, constraint->pbData,
     name->cbData, name->pbData);

818 819 820 821
    /* RFC5280, section 4.2.1.10, iPAddress syntax: either 8 or 32 bytes, for
     * IPv4 or IPv6 addresses, respectively.
     */
    if (constraint->cbData != sizeof(DWORD) * 2 && constraint->cbData != 32)
822
        *trustErrorStatus |= CERT_TRUST_INVALID_NAME_CONSTRAINTS;
823 824
    else if (name->cbData == sizeof(DWORD) &&
     constraint->cbData == sizeof(DWORD) * 2)
825 826 827 828 829 830 831 832 833 834 835
    {
        DWORD subnet, mask, addr;

        memcpy(&subnet, constraint->pbData, sizeof(subnet));
        memcpy(&mask, constraint->pbData + sizeof(subnet), sizeof(mask));
        memcpy(&addr, name->pbData, sizeof(addr));
        /* These are really in big-endian order, but for equality matching we
         * don't need to swap to host order
         */
        match = (subnet & mask) == (addr & mask);
    }
836 837 838 839 840 841 842 843 844 845 846 847 848
    else if (name->cbData == 16 && constraint->cbData == 32)
    {
        const BYTE *subnet, *mask, *addr;
        DWORD i;

        subnet = constraint->pbData;
        mask = constraint->pbData + 16;
        addr = name->pbData;
        match = TRUE;
        for (i = 0; match && i < 16; i++)
            if ((subnet[i] & mask[i]) != (addr[i] & mask[i]))
                match = FALSE;
    }
849 850
    /* else: name is wrong size, no match */

851 852 853
    return match;
}

854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
static BOOL directory_name_matches(const CERT_NAME_BLOB *constraint,
 const CERT_NAME_BLOB *name)
{
    CERT_NAME_INFO *constraintName;
    DWORD size;
    BOOL match = FALSE;

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_NAME, constraint->pbData,
     constraint->cbData, CRYPT_DECODE_ALLOC_FLAG, NULL, &constraintName, &size))
    {
        DWORD i;

        match = TRUE;
        for (i = 0; match && i < constraintName->cRDN; i++)
            match = CertIsRDNAttrsInCertificateName(X509_ASN_ENCODING,
             CERT_CASE_INSENSITIVE_IS_RDN_ATTRS_FLAG,
             (CERT_NAME_BLOB *)name, &constraintName->rgRDN[i]);
        LocalFree(constraintName);
    }
    return match;
}

876
static BOOL alt_name_matches(const CERT_ALT_NAME_ENTRY *name,
877
 const CERT_ALT_NAME_ENTRY *constraint, DWORD *trustErrorStatus, BOOL *present)
878
{
879
    BOOL match = FALSE;
880

881
    if (name->dwAltNameChoice == constraint->dwAltNameChoice)
882
    {
883 884
        if (present)
            *present = TRUE;
885
        switch (constraint->dwAltNameChoice)
886
        {
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
        case CERT_ALT_NAME_RFC822_NAME:
            match = rfc822_name_matches(constraint->u.pwszURL,
             name->u.pwszURL, trustErrorStatus);
            break;
        case CERT_ALT_NAME_DNS_NAME:
            match = dns_name_matches(constraint->u.pwszURL,
             name->u.pwszURL, trustErrorStatus);
            break;
        case CERT_ALT_NAME_URL:
            match = url_matches(constraint->u.pwszURL,
             name->u.pwszURL, trustErrorStatus);
            break;
        case CERT_ALT_NAME_IP_ADDRESS:
            match = ip_address_matches(&constraint->u.IPAddress,
             &name->u.IPAddress, trustErrorStatus);
            break;
        case CERT_ALT_NAME_DIRECTORY_NAME:
904 905 906
            match = directory_name_matches(&constraint->u.DirectoryName,
             &name->u.DirectoryName);
            break;
907 908 909 910 911
        default:
            ERR("name choice %d unsupported in this context\n",
             constraint->dwAltNameChoice);
            *trustErrorStatus |=
             CERT_TRUST_HAS_NOT_SUPPORTED_NAME_CONSTRAINT;
912 913
        }
    }
914 915
    else if (present)
        *present = FALSE;
916
    return match;
917 918
}

919 920 921 922 923 924 925 926
static BOOL alt_name_matches_excluded_name(const CERT_ALT_NAME_ENTRY *name,
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, DWORD *trustErrorStatus)
{
    DWORD i;
    BOOL match = FALSE;

    for (i = 0; !match && i < nameConstraints->cExcludedSubtree; i++)
        match = alt_name_matches(name,
927
         &nameConstraints->rgExcludedSubtree[i].Base, trustErrorStatus, NULL);
928 929 930 931
    return match;
}

static BOOL alt_name_matches_permitted_name(const CERT_ALT_NAME_ENTRY *name,
932 933
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, DWORD *trustErrorStatus,
 BOOL *present)
934 935 936 937 938 939
{
    DWORD i;
    BOOL match = FALSE;

    for (i = 0; !match && i < nameConstraints->cPermittedSubtree; i++)
        match = alt_name_matches(name,
940 941
         &nameConstraints->rgPermittedSubtree[i].Base, trustErrorStatus,
         present);
942 943 944
    return match;
}

945 946 947 948 949 950 951 952 953 954 955 956
static inline PCERT_EXTENSION get_subject_alt_name_ext(const CERT_INFO *cert)
{
    PCERT_EXTENSION ext;

    ext = CertFindExtension(szOID_SUBJECT_ALT_NAME2,
     cert->cExtension, cert->rgExtension);
    if (!ext)
        ext = CertFindExtension(szOID_SUBJECT_ALT_NAME,
         cert->cExtension, cert->rgExtension);
    return ext;
}

957 958
static void compare_alt_name_with_constraints(const CERT_EXTENSION *altNameExt,
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, DWORD *trustErrorStatus)
959
{
960 961
    CERT_ALT_NAME_INFO *subjectAltName;
    DWORD size;
962

963 964 965 966
    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_ALTERNATE_NAME,
     altNameExt->Value.pbData, altNameExt->Value.cbData,
     CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
     &subjectAltName, &size))
967
    {
968
        DWORD i;
969

970
        for (i = 0; i < subjectAltName->cAltEntry; i++)
971
        {
972 973 974 975 976 977 978 979 980 981 982
             BOOL nameFormPresent;

             /* A name constraint only applies if the name form is present.
              * From RFC 5280, section 4.2.1.10:
              * "Restrictions apply only when the specified name form is
              *  present.  If no name of the type is in the certificate,
              *  the certificate is acceptable."
              */
            if (alt_name_matches_excluded_name(
             &subjectAltName->rgAltEntry[i], nameConstraints,
             trustErrorStatus))
983 984 985
            {
                TRACE_(chain)("subject alternate name form %d excluded\n",
                 subjectAltName->rgAltEntry[i].dwAltNameChoice);
986 987
                *trustErrorStatus |=
                 CERT_TRUST_HAS_EXCLUDED_NAME_CONSTRAINT;
988
            }
989 990 991 992
            nameFormPresent = FALSE;
            if (!alt_name_matches_permitted_name(
             &subjectAltName->rgAltEntry[i], nameConstraints,
             trustErrorStatus, &nameFormPresent) && nameFormPresent)
993 994 995
            {
                TRACE_(chain)("subject alternate name form %d not permitted\n",
                 subjectAltName->rgAltEntry[i].dwAltNameChoice);
996 997
                *trustErrorStatus |=
                 CERT_TRUST_HAS_NOT_PERMITTED_NAME_CONSTRAINT;
998
            }
999
        }
1000
        LocalFree(subjectAltName);
1001
    }
1002 1003 1004 1005 1006
    else
        *trustErrorStatus |=
         CERT_TRUST_INVALID_EXTENSION | CERT_TRUST_INVALID_NAME_CONSTRAINTS;
}

1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075
static BOOL rfc822_attr_matches_excluded_name(const CERT_RDN_ATTR *attr,
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, DWORD *trustErrorStatus)
{
    DWORD i;
    BOOL match = FALSE;

    for (i = 0; !match && i < nameConstraints->cExcludedSubtree; i++)
    {
        const CERT_ALT_NAME_ENTRY *constraint =
         &nameConstraints->rgExcludedSubtree[i].Base;

        if (constraint->dwAltNameChoice == CERT_ALT_NAME_RFC822_NAME)
            match = rfc822_name_matches(constraint->u.pwszRfc822Name,
             (LPCWSTR)attr->Value.pbData, trustErrorStatus);
    }
    return match;
}

static BOOL rfc822_attr_matches_permitted_name(const CERT_RDN_ATTR *attr,
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, DWORD *trustErrorStatus,
 BOOL *present)
{
    DWORD i;
    BOOL match = FALSE;

    for (i = 0; !match && i < nameConstraints->cPermittedSubtree; i++)
    {
        const CERT_ALT_NAME_ENTRY *constraint =
         &nameConstraints->rgPermittedSubtree[i].Base;

        if (constraint->dwAltNameChoice == CERT_ALT_NAME_RFC822_NAME)
        {
            *present = TRUE;
            match = rfc822_name_matches(constraint->u.pwszRfc822Name,
             (LPCWSTR)attr->Value.pbData, trustErrorStatus);
        }
    }
    return match;
}

static void compare_subject_with_email_constraints(
 const CERT_NAME_BLOB *subjectName,
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, DWORD *trustErrorStatus)
{
    CERT_NAME_INFO *name;
    DWORD size;

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_UNICODE_NAME,
     subjectName->pbData, subjectName->cbData,
     CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL, &name, &size))
    {
        DWORD i, j;

        for (i = 0; i < name->cRDN; i++)
            for (j = 0; j < name->rgRDN[i].cRDNAttr; j++)
                if (!strcmp(name->rgRDN[i].rgRDNAttr[j].pszObjId,
                 szOID_RSA_emailAddr))
                {
                    BOOL nameFormPresent;

                    /* A name constraint only applies if the name form is
                     * present.  From RFC 5280, section 4.2.1.10:
                     * "Restrictions apply only when the specified name form is
                     *  present.  If no name of the type is in the certificate,
                     *  the certificate is acceptable."
                     */
                    if (rfc822_attr_matches_excluded_name(
                     &name->rgRDN[i].rgRDNAttr[j], nameConstraints,
                     trustErrorStatus))
1076 1077 1078
                    {
                        TRACE_(chain)(
                         "email address in subject name is excluded\n");
1079 1080
                        *trustErrorStatus |=
                         CERT_TRUST_HAS_EXCLUDED_NAME_CONSTRAINT;
1081
                    }
1082 1083 1084 1085
                    nameFormPresent = FALSE;
                    if (!rfc822_attr_matches_permitted_name(
                     &name->rgRDN[i].rgRDNAttr[j], nameConstraints,
                     trustErrorStatus, &nameFormPresent) && nameFormPresent)
1086 1087 1088
                    {
                        TRACE_(chain)(
                         "email address in subject name is not permitted\n");
1089 1090
                        *trustErrorStatus |=
                         CERT_TRUST_HAS_NOT_PERMITTED_NAME_CONSTRAINT;
1091
                    }
1092 1093 1094 1095 1096 1097 1098 1099
                }
        LocalFree(name);
    }
    else
        *trustErrorStatus |=
         CERT_TRUST_INVALID_EXTENSION | CERT_TRUST_INVALID_NAME_CONSTRAINTS;
}

1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
static BOOL CRYPT_IsEmptyName(const CERT_NAME_BLOB *name)
{
    BOOL empty;

    if (!name->cbData)
        empty = TRUE;
    else if (name->cbData == 2 && name->pbData[1] == 0)
    {
        /* An empty sequence is also empty */
        empty = TRUE;
    }
    else
        empty = FALSE;
    return empty;
}

1116 1117 1118
static void compare_subject_with_constraints(const CERT_NAME_BLOB *subjectName,
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, DWORD *trustErrorStatus)
{
1119
    BOOL hasEmailConstraint = FALSE;
1120 1121
    DWORD i;

1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
    /* In general, a subject distinguished name only matches a directory name
     * constraint.  However, an exception exists for email addresses.
     * From RFC 5280, section 4.2.1.6:
     * "Legacy implementations exist where an electronic mail address is
     *  embedded in the subject distinguished name as an emailAddress
     *  attribute [RFC2985]."
     * If an email address constraint exists, check that constraint separately.
     */
    for (i = 0; !hasEmailConstraint && i < nameConstraints->cExcludedSubtree;
     i++)
        if (nameConstraints->rgExcludedSubtree[i].Base.dwAltNameChoice ==
         CERT_ALT_NAME_RFC822_NAME)
            hasEmailConstraint = TRUE;
    for (i = 0; !hasEmailConstraint && i < nameConstraints->cPermittedSubtree;
     i++)
        if (nameConstraints->rgPermittedSubtree[i].Base.dwAltNameChoice ==
         CERT_ALT_NAME_RFC822_NAME)
            hasEmailConstraint = TRUE;
    if (hasEmailConstraint)
        compare_subject_with_email_constraints(subjectName, nameConstraints,
         trustErrorStatus);
1143 1144 1145 1146 1147 1148 1149
    for (i = 0; i < nameConstraints->cExcludedSubtree; i++)
    {
        CERT_ALT_NAME_ENTRY *constraint =
         &nameConstraints->rgExcludedSubtree[i].Base;

        if (constraint->dwAltNameChoice == CERT_ALT_NAME_DIRECTORY_NAME &&
         directory_name_matches(&constraint->u.DirectoryName, subjectName))
1150 1151
        {
            TRACE_(chain)("subject name is excluded\n");
1152 1153
            *trustErrorStatus |=
             CERT_TRUST_HAS_EXCLUDED_NAME_CONSTRAINT;
1154
        }
1155
    }
1156 1157 1158 1159 1160 1161 1162
    /* RFC 5280, section 4.2.1.10:
     * "Restrictions apply only when the specified name form is present.
     *  If no name of the type is in the certificate, the certificate is
     *  acceptable."
     * An empty name can't have the name form present, so don't check it.
     */
    if (nameConstraints->cPermittedSubtree && !CRYPT_IsEmptyName(subjectName))
1163
    {
1164
        BOOL match = FALSE, hasDirectoryConstraint = FALSE;
1165

1166
        for (i = 0; !match && i < nameConstraints->cPermittedSubtree; i++)
1167
        {
1168 1169 1170 1171
            CERT_ALT_NAME_ENTRY *constraint =
             &nameConstraints->rgPermittedSubtree[i].Base;

            if (constraint->dwAltNameChoice == CERT_ALT_NAME_DIRECTORY_NAME)
1172 1173
            {
                hasDirectoryConstraint = TRUE;
1174 1175
                match = directory_name_matches(&constraint->u.DirectoryName,
                 subjectName);
1176
            }
1177
        }
1178
        if (hasDirectoryConstraint && !match)
1179 1180
        {
            TRACE_(chain)("subject name is not permitted\n");
1181
            *trustErrorStatus |= CERT_TRUST_HAS_NOT_PERMITTED_NAME_CONSTRAINT;
1182
        }
1183 1184 1185
    }
}

1186 1187 1188 1189 1190 1191 1192 1193 1194
static void CRYPT_CheckNameConstraints(
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, const CERT_INFO *cert,
 DWORD *trustErrorStatus)
{
    CERT_EXTENSION *ext = get_subject_alt_name_ext(cert);

    if (ext)
        compare_alt_name_with_constraints(ext, nameConstraints,
         trustErrorStatus);
1195 1196 1197 1198 1199 1200 1201
    /* Name constraints apply to the subject alternative name as well as the
     * subject name.  From RFC 5280, section 4.2.1.10:
     * "Restrictions apply to the subject distinguished name and apply to
     *  subject alternative names."
     */
    compare_subject_with_constraints(&cert->Subject, nameConstraints,
     trustErrorStatus);
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
}

/* Gets cert's name constraints, if any.  Free with LocalFree. */
static CERT_NAME_CONSTRAINTS_INFO *CRYPT_GetNameConstraints(CERT_INFO *cert)
{
    CERT_NAME_CONSTRAINTS_INFO *info = NULL;

    CERT_EXTENSION *ext;

    if ((ext = CertFindExtension(szOID_NAME_CONSTRAINTS, cert->cExtension,
     cert->rgExtension)))
    {
        DWORD size;

        CryptDecodeObjectEx(X509_ASN_ENCODING, X509_NAME_CONSTRAINTS,
         ext->Value.pbData, ext->Value.cbData,
         CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL, &info,
         &size);
    }
    return info;
}

1224 1225 1226 1227 1228
static BOOL CRYPT_IsValidNameConstraint(const CERT_NAME_CONSTRAINTS_INFO *info)
{
    DWORD i;
    BOOL ret = TRUE;

1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
    /* Make sure at least one permitted or excluded subtree is present.  From
     * RFC 5280, section 4.2.1.10:
     * "Conforming CAs MUST NOT issue certificates where name constraints is an
     *  empty sequence.  That is, either the permittedSubtrees field or the
     *  excludedSubtrees MUST be present."
     */
    if (!info->cPermittedSubtree && !info->cExcludedSubtree)
    {
        WARN_(chain)("constraints contain no permitted nor excluded subtree\n");
        ret = FALSE;
    }
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
    /* Check that none of the constraints specifies a minimum or a maximum.
     * See RFC 5280, section 4.2.1.10:
     * "Within this profile, the minimum and maximum fields are not used with
     *  any name forms, thus, the minimum MUST be zero, and maximum MUST be
     *  absent.  However, if an application encounters a critical name
     *  constraints extension that specifies other values for minimum or
     *  maximum for a name form that appears in a subsequent certificate, the
     *  application MUST either process these fields or reject the
     *  certificate."
     * Since it gives no guidance as to how to process these fields, we
     * reject any name constraint that contains them.
     */
    for (i = 0; ret && i < info->cPermittedSubtree; i++)
        if (info->rgPermittedSubtree[i].dwMinimum ||
         info->rgPermittedSubtree[i].fMaximum)
        {
            TRACE_(chain)("found a minimum or maximum in permitted subtrees\n");
            ret = FALSE;
        }
    for (i = 0; ret && i < info->cExcludedSubtree; i++)
        if (info->rgExcludedSubtree[i].dwMinimum ||
         info->rgExcludedSubtree[i].fMaximum)
        {
            TRACE_(chain)("found a minimum or maximum in excluded subtrees\n");
            ret = FALSE;
        }
    return ret;
}

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static void CRYPT_CheckChainNameConstraints(PCERT_SIMPLE_CHAIN chain)
{
    int i, j;

    /* Microsoft's implementation appears to violate RFC 3280:  according to
     * MSDN, the various CERT_TRUST_*_NAME_CONSTRAINT errors are set if a CA's
     * name constraint is violated in the end cert.  According to RFC 3280,
     * the constraints should be checked against every subsequent certificate
     * in the chain, not just the end cert.
     * Microsoft's implementation also sets the name constraint errors on the
     * certs whose constraints were violated, not on the certs that violated
     * them.
     * In order to be error-compatible with Microsoft's implementation, while
     * still adhering to RFC 3280, I use a O(n ^ 2) algorithm to check name
     * constraints.
     */
    for (i = chain->cElement - 1; i > 0; i--)
    {
        CERT_NAME_CONSTRAINTS_INFO *nameConstraints;

        if ((nameConstraints = CRYPT_GetNameConstraints(
         chain->rgpElement[i]->pCertContext->pCertInfo)))
        {
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            if (!CRYPT_IsValidNameConstraint(nameConstraints))
                chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                 CERT_TRUST_HAS_NOT_SUPPORTED_NAME_CONSTRAINT;
            else
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            {
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                for (j = i - 1; j >= 0; j--)
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                {
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                    DWORD errorStatus = 0;

                    /* According to RFC 3280, self-signed certs don't have name
                     * constraints checked unless they're the end cert.
                     */
                    if (j == 0 || !CRYPT_IsCertificateSelfSigned(
                     chain->rgpElement[j]->pCertContext))
                    {
                        CRYPT_CheckNameConstraints(nameConstraints,
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                         chain->rgpElement[j]->pCertContext->pCertInfo,
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                         &errorStatus);
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                        if (errorStatus)
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                        {
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                            chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                             errorStatus;
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                            CRYPT_CombineTrustStatus(&chain->TrustStatus,
                             &chain->rgpElement[i]->TrustStatus);
                        }
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                        else
                            chain->rgpElement[i]->TrustStatus.dwInfoStatus |=
                             CERT_TRUST_HAS_VALID_NAME_CONSTRAINTS;
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                    }
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                }
            }
            LocalFree(nameConstraints);
        }
    }
}

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/* Gets cert's policies info, if any.  Free with LocalFree. */
static CERT_POLICIES_INFO *CRYPT_GetPolicies(PCCERT_CONTEXT cert)
{
    PCERT_EXTENSION ext;
    CERT_POLICIES_INFO *policies = NULL;

    ext = CertFindExtension(szOID_KEY_USAGE, cert->pCertInfo->cExtension,
     cert->pCertInfo->rgExtension);
    if (ext)
    {
        DWORD size;

        CryptDecodeObjectEx(X509_ASN_ENCODING, X509_CERT_POLICIES,
         ext->Value.pbData, ext->Value.cbData, CRYPT_DECODE_ALLOC_FLAG, NULL,
         &policies, &size);
    }
    return policies;
}

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static void CRYPT_CheckPolicies(const CERT_POLICIES_INFO *policies, CERT_INFO *cert,
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 DWORD *errorStatus)
{
    DWORD i;

    for (i = 0; i < policies->cPolicyInfo; i++)
    {
        /* For now, the only accepted policy identifier is the anyPolicy
         * identifier.
         * FIXME: the policy identifiers should be compared against the
         * cert's certificate policies extension, subject to the policy
         * mappings extension, and the policy constraints extension.
         * See RFC 5280, sections 4.2.1.4, 4.2.1.5, and 4.2.1.11.
         */
        if (strcmp(policies->rgPolicyInfo[i].pszPolicyIdentifier,
         szOID_ANY_CERT_POLICY))
        {
            FIXME("unsupported policy %s\n",
             policies->rgPolicyInfo[i].pszPolicyIdentifier);
            *errorStatus |= CERT_TRUST_INVALID_POLICY_CONSTRAINTS;
        }
    }
}

static void CRYPT_CheckChainPolicies(PCERT_SIMPLE_CHAIN chain)
{
    int i, j;

    for (i = chain->cElement - 1; i > 0; i--)
    {
        CERT_POLICIES_INFO *policies;

        if ((policies = CRYPT_GetPolicies(chain->rgpElement[i]->pCertContext)))
        {
            for (j = i - 1; j >= 0; j--)
            {
                DWORD errorStatus = 0;

                CRYPT_CheckPolicies(policies,
                 chain->rgpElement[j]->pCertContext->pCertInfo, &errorStatus);
                if (errorStatus)
                {
                    chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                     errorStatus;
                    CRYPT_CombineTrustStatus(&chain->TrustStatus,
                     &chain->rgpElement[i]->TrustStatus);
                }
            }
            LocalFree(policies);
        }
    }
}

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static LPWSTR name_value_to_str(const CERT_NAME_BLOB *name)
{
    DWORD len = cert_name_to_str_with_indent(X509_ASN_ENCODING, 0, name,
     CERT_SIMPLE_NAME_STR, NULL, 0);
    LPWSTR str = NULL;

    if (len)
    {
        str = CryptMemAlloc(len * sizeof(WCHAR));
        if (str)
            cert_name_to_str_with_indent(X509_ASN_ENCODING, 0, name,
             CERT_SIMPLE_NAME_STR, str, len);
    }
    return str;
}

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static void dump_alt_name_entry(const CERT_ALT_NAME_ENTRY *entry)
{
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    LPWSTR str;

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    switch (entry->dwAltNameChoice)
    {
    case CERT_ALT_NAME_OTHER_NAME:
        TRACE_(chain)("CERT_ALT_NAME_OTHER_NAME, oid = %s\n",
         debugstr_a(entry->u.pOtherName->pszObjId));
         break;
    case CERT_ALT_NAME_RFC822_NAME:
        TRACE_(chain)("CERT_ALT_NAME_RFC822_NAME: %s\n",
         debugstr_w(entry->u.pwszRfc822Name));
        break;
    case CERT_ALT_NAME_DNS_NAME:
        TRACE_(chain)("CERT_ALT_NAME_DNS_NAME: %s\n",
         debugstr_w(entry->u.pwszDNSName));
        break;
    case CERT_ALT_NAME_DIRECTORY_NAME:
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        str = name_value_to_str(&entry->u.DirectoryName);
        TRACE_(chain)("CERT_ALT_NAME_DIRECTORY_NAME: %s\n", debugstr_w(str));
        CryptMemFree(str);
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        break;
    case CERT_ALT_NAME_URL:
        TRACE_(chain)("CERT_ALT_NAME_URL: %s\n", debugstr_w(entry->u.pwszURL));
        break;
    case CERT_ALT_NAME_IP_ADDRESS:
        TRACE_(chain)("CERT_ALT_NAME_IP_ADDRESS: %d bytes\n",
         entry->u.IPAddress.cbData);
        break;
    case CERT_ALT_NAME_REGISTERED_ID:
        TRACE_(chain)("CERT_ALT_NAME_REGISTERED_ID: %s\n",
         debugstr_a(entry->u.pszRegisteredID));
        break;
    default:
        TRACE_(chain)("dwAltNameChoice = %d\n", entry->dwAltNameChoice);
    }
}

static void dump_alt_name(LPCSTR type, const CERT_EXTENSION *ext)
{
    CERT_ALT_NAME_INFO *name;
    DWORD size;

    TRACE_(chain)("%s:\n", type);
    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_ALTERNATE_NAME,
     ext->Value.pbData, ext->Value.cbData,
     CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL, &name, &size))
    {
        DWORD i;

        TRACE_(chain)("%d alt name entries:\n", name->cAltEntry);
        for (i = 0; i < name->cAltEntry; i++)
            dump_alt_name_entry(&name->rgAltEntry[i]);
        LocalFree(name);
    }
}

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static void dump_basic_constraints(const CERT_EXTENSION *ext)
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{
    CERT_BASIC_CONSTRAINTS_INFO *info;
    DWORD size = 0;

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, szOID_BASIC_CONSTRAINTS,
     ext->Value.pbData, ext->Value.cbData, CRYPT_DECODE_ALLOC_FLAG,
     NULL, &info, &size))
    {
        TRACE_(chain)("SubjectType: %02x\n", info->SubjectType.pbData[0]);
        TRACE_(chain)("%s path length constraint\n",
         info->fPathLenConstraint ? "has" : "doesn't have");
        TRACE_(chain)("path length=%d\n", info->dwPathLenConstraint);
        LocalFree(info);
    }
}

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static void dump_basic_constraints2(const CERT_EXTENSION *ext)
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{
    CERT_BASIC_CONSTRAINTS2_INFO constraints;
    DWORD size = sizeof(CERT_BASIC_CONSTRAINTS2_INFO);

    if (CryptDecodeObjectEx(X509_ASN_ENCODING,
     szOID_BASIC_CONSTRAINTS2, ext->Value.pbData, ext->Value.cbData,
     0, NULL, &constraints, &size))
    {
        TRACE_(chain)("basic constraints:\n");
        TRACE_(chain)("can%s be a CA\n", constraints.fCA ? "" : "not");
        TRACE_(chain)("%s path length constraint\n",
         constraints.fPathLenConstraint ? "has" : "doesn't have");
        TRACE_(chain)("path length=%d\n", constraints.dwPathLenConstraint);
    }
}

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static void dump_key_usage(const CERT_EXTENSION *ext)
{
    CRYPT_BIT_BLOB usage;
    DWORD size = sizeof(usage);

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_BITS, ext->Value.pbData,
     ext->Value.cbData, CRYPT_DECODE_NOCOPY_FLAG, NULL, &usage, &size))
    {
#define trace_usage_bit(bits, bit) \
 if ((bits) & (bit)) TRACE_(chain)("%s\n", #bit)
        if (usage.cbData)
        {
            trace_usage_bit(usage.pbData[0], CERT_DIGITAL_SIGNATURE_KEY_USAGE);
            trace_usage_bit(usage.pbData[0], CERT_NON_REPUDIATION_KEY_USAGE);
            trace_usage_bit(usage.pbData[0], CERT_KEY_ENCIPHERMENT_KEY_USAGE);
            trace_usage_bit(usage.pbData[0], CERT_DATA_ENCIPHERMENT_KEY_USAGE);
            trace_usage_bit(usage.pbData[0], CERT_KEY_AGREEMENT_KEY_USAGE);
            trace_usage_bit(usage.pbData[0], CERT_KEY_CERT_SIGN_KEY_USAGE);
            trace_usage_bit(usage.pbData[0], CERT_CRL_SIGN_KEY_USAGE);
            trace_usage_bit(usage.pbData[0], CERT_ENCIPHER_ONLY_KEY_USAGE);
        }
#undef trace_usage_bit
        if (usage.cbData > 1 && usage.pbData[1] & CERT_DECIPHER_ONLY_KEY_USAGE)
            TRACE_(chain)("CERT_DECIPHER_ONLY_KEY_USAGE\n");
    }
}

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static void dump_general_subtree(const CERT_GENERAL_SUBTREE *subtree)
{
    dump_alt_name_entry(&subtree->Base);
    TRACE_(chain)("dwMinimum = %d, fMaximum = %d, dwMaximum = %d\n",
     subtree->dwMinimum, subtree->fMaximum, subtree->dwMaximum);
}

static void dump_name_constraints(const CERT_EXTENSION *ext)
{
    CERT_NAME_CONSTRAINTS_INFO *nameConstraints;
    DWORD size;

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_NAME_CONSTRAINTS,
     ext->Value.pbData, ext->Value.cbData,
     CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL, &nameConstraints,
     &size))
    {
        DWORD i;

        TRACE_(chain)("%d permitted subtrees:\n",
         nameConstraints->cPermittedSubtree);
        for (i = 0; i < nameConstraints->cPermittedSubtree; i++)
            dump_general_subtree(&nameConstraints->rgPermittedSubtree[i]);
        TRACE_(chain)("%d excluded subtrees:\n",
         nameConstraints->cExcludedSubtree);
        for (i = 0; i < nameConstraints->cExcludedSubtree; i++)
            dump_general_subtree(&nameConstraints->rgExcludedSubtree[i]);
        LocalFree(nameConstraints);
    }
}

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static void dump_cert_policies(const CERT_EXTENSION *ext)
{
    CERT_POLICIES_INFO *policies;
    DWORD size;

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_CERT_POLICIES,
     ext->Value.pbData, ext->Value.cbData, CRYPT_DECODE_ALLOC_FLAG, NULL,
     &policies, &size))
    {
        DWORD i, j;

        TRACE_(chain)("%d policies:\n", policies->cPolicyInfo);
        for (i = 0; i < policies->cPolicyInfo; i++)
        {
            TRACE_(chain)("policy identifier: %s\n",
             debugstr_a(policies->rgPolicyInfo[i].pszPolicyIdentifier));
            TRACE_(chain)("%d policy qualifiers:\n",
             policies->rgPolicyInfo[i].cPolicyQualifier);
            for (j = 0; j < policies->rgPolicyInfo[i].cPolicyQualifier; j++)
                TRACE_(chain)("%s\n", debugstr_a(
                 policies->rgPolicyInfo[i].rgPolicyQualifier[j].
                 pszPolicyQualifierId));
        }
        LocalFree(policies);
    }
}

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static void dump_enhanced_key_usage(const CERT_EXTENSION *ext)
{
    CERT_ENHKEY_USAGE *usage;
    DWORD size;

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_ENHANCED_KEY_USAGE,
     ext->Value.pbData, ext->Value.cbData, CRYPT_DECODE_ALLOC_FLAG, NULL,
     &usage, &size))
    {
        DWORD i;

        TRACE_(chain)("%d usages:\n", usage->cUsageIdentifier);
        for (i = 0; i < usage->cUsageIdentifier; i++)
            TRACE_(chain)("%s\n", usage->rgpszUsageIdentifier[i]);
        LocalFree(usage);
    }
}

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static void dump_netscape_cert_type(const CERT_EXTENSION *ext)
{
    CRYPT_BIT_BLOB usage;
    DWORD size = sizeof(usage);

    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_BITS, ext->Value.pbData,
     ext->Value.cbData, CRYPT_DECODE_NOCOPY_FLAG, NULL, &usage, &size))
    {
#define trace_cert_type_bit(bits, bit) \
 if ((bits) & (bit)) TRACE_(chain)("%s\n", #bit)
        if (usage.cbData)
        {
            trace_cert_type_bit(usage.pbData[0],
             NETSCAPE_SSL_CLIENT_AUTH_CERT_TYPE);
            trace_cert_type_bit(usage.pbData[0],
             NETSCAPE_SSL_SERVER_AUTH_CERT_TYPE);
            trace_cert_type_bit(usage.pbData[0], NETSCAPE_SMIME_CERT_TYPE);
            trace_cert_type_bit(usage.pbData[0], NETSCAPE_SIGN_CERT_TYPE);
            trace_cert_type_bit(usage.pbData[0], NETSCAPE_SSL_CA_CERT_TYPE);
            trace_cert_type_bit(usage.pbData[0], NETSCAPE_SMIME_CA_CERT_TYPE);
            trace_cert_type_bit(usage.pbData[0], NETSCAPE_SIGN_CA_CERT_TYPE);
        }
#undef trace_cert_type_bit
    }
}

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static void dump_extension(const CERT_EXTENSION *ext)
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{
    TRACE_(chain)("%s (%scritical)\n", debugstr_a(ext->pszObjId),
     ext->fCritical ? "" : "not ");
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    if (!strcmp(ext->pszObjId, szOID_SUBJECT_ALT_NAME))
        dump_alt_name("subject alt name", ext);
    else  if (!strcmp(ext->pszObjId, szOID_ISSUER_ALT_NAME))
        dump_alt_name("issuer alt name", ext);
    else if (!strcmp(ext->pszObjId, szOID_BASIC_CONSTRAINTS))
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        dump_basic_constraints(ext);
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    else if (!strcmp(ext->pszObjId, szOID_KEY_USAGE))
        dump_key_usage(ext);
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    else if (!strcmp(ext->pszObjId, szOID_SUBJECT_ALT_NAME2))
        dump_alt_name("subject alt name 2", ext);
    else if (!strcmp(ext->pszObjId, szOID_ISSUER_ALT_NAME2))
        dump_alt_name("issuer alt name 2", ext);
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    else if (!strcmp(ext->pszObjId, szOID_BASIC_CONSTRAINTS2))
        dump_basic_constraints2(ext);
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    else if (!strcmp(ext->pszObjId, szOID_NAME_CONSTRAINTS))
        dump_name_constraints(ext);
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    else if (!strcmp(ext->pszObjId, szOID_CERT_POLICIES))
        dump_cert_policies(ext);
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    else if (!strcmp(ext->pszObjId, szOID_ENHANCED_KEY_USAGE))
        dump_enhanced_key_usage(ext);
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    else if (!strcmp(ext->pszObjId, szOID_NETSCAPE_CERT_TYPE))
        dump_netscape_cert_type(ext);
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}

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static LPCSTR filetime_to_str(const FILETIME *time)
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{
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    char date[80];
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    char dateFmt[80]; /* sufficient for all versions of LOCALE_SSHORTDATE */
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    SYSTEMTIME sysTime;

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    if (!time) return "(null)";
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    GetLocaleInfoA(LOCALE_SYSTEM_DEFAULT, LOCALE_SSHORTDATE, dateFmt,
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     sizeof(dateFmt) / sizeof(dateFmt[0]));
    FileTimeToSystemTime(time, &sysTime);
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    GetDateFormatA(LOCALE_SYSTEM_DEFAULT, 0, &sysTime, dateFmt, date,
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     sizeof(date) / sizeof(date[0]));
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    return wine_dbg_sprintf("%s", date);
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}

static void dump_element(PCCERT_CONTEXT cert)
{
    LPWSTR name = NULL;
    DWORD len, i;

Juan Lang's avatar
Juan Lang committed
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    TRACE_(chain)("%p: version %d\n", cert, cert->pCertInfo->dwVersion);
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    len = CertGetNameStringW(cert, CERT_NAME_SIMPLE_DISPLAY_TYPE,
     CERT_NAME_ISSUER_FLAG, NULL, NULL, 0);
    name = CryptMemAlloc(len * sizeof(WCHAR));
    if (name)
    {
        CertGetNameStringW(cert, CERT_NAME_SIMPLE_DISPLAY_TYPE,
         CERT_NAME_ISSUER_FLAG, NULL, name, len);
        TRACE_(chain)("issued by %s\n", debugstr_w(name));
        CryptMemFree(name);
    }
    len = CertGetNameStringW(cert, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL,
     NULL, 0);
    name = CryptMemAlloc(len * sizeof(WCHAR));
    if (name)
    {
        CertGetNameStringW(cert, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL,
         name, len);
        TRACE_(chain)("issued to %s\n", debugstr_w(name));
        CryptMemFree(name);
    }
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    TRACE_(chain)("valid from %s to %s\n",
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     filetime_to_str(&cert->pCertInfo->NotBefore),
     filetime_to_str(&cert->pCertInfo->NotAfter));
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    TRACE_(chain)("%d extensions\n", cert->pCertInfo->cExtension);
    for (i = 0; i < cert->pCertInfo->cExtension; i++)
        dump_extension(&cert->pCertInfo->rgExtension[i]);
}

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static BOOL CRYPT_KeyUsageValid(PCertificateChainEngine engine,
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 PCCERT_CONTEXT cert, BOOL isRoot, BOOL isCA, DWORD index)
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{
    PCERT_EXTENSION ext;
    BOOL ret;
    BYTE usageBits = 0;

    ext = CertFindExtension(szOID_KEY_USAGE, cert->pCertInfo->cExtension,
     cert->pCertInfo->rgExtension);
    if (ext)
    {
        CRYPT_BIT_BLOB usage;
        DWORD size = sizeof(usage);

        ret = CryptDecodeObjectEx(cert->dwCertEncodingType, X509_BITS,
         ext->Value.pbData, ext->Value.cbData, CRYPT_DECODE_NOCOPY_FLAG, NULL,
         &usage, &size);
        if (!ret)
            return FALSE;
        else if (usage.cbData > 2)
        {
            /* The key usage extension only defines 9 bits => no more than 2
             * bytes are needed to encode all known usages.
             */
            return FALSE;
        }
        else
        {
            /* The only bit relevant to chain validation is the keyCertSign
             * bit, which is always in the least significant byte of the
             * key usage bits.
             */
            usageBits = usage.pbData[usage.cbData - 1];
        }
    }
    if (isCA)
    {
        if (!ext)
        {
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            /* MS appears to violate RFC 5280, section 4.2.1.3 (Key Usage)
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             * here.  Quoting the RFC:
             * "This [key usage] extension MUST appear in certificates that
             * contain public keys that are used to validate digital signatures
             * on other public key certificates or CRLs."
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             * MS appears to accept certs that do not contain key usage
             * extensions as CA certs.  V1 and V2 certificates did not have
             * extensions, and many root certificates are V1 certificates, so
             * perhaps this is prudent.  On the other hand, MS also accepts V3
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             * certs without key usage extensions.  Because some CAs, e.g.
             * Certum, also do not include key usage extensions in their
             * intermediate certificates, we are forced to accept V3
             * certificates without key usage extensions as well.
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             */
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            ret = TRUE;
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        }
        else
        {
            if (!(usageBits & CERT_KEY_CERT_SIGN_KEY_USAGE))
            {
                WARN_(chain)("keyCertSign not asserted on a CA cert\n");
                ret = FALSE;
            }
            else
                ret = TRUE;
        }
    }
    else
    {
        if (ext && (usageBits & CERT_KEY_CERT_SIGN_KEY_USAGE))
        {
            WARN_(chain)("keyCertSign asserted on a non-CA cert\n");
            ret = FALSE;
        }
        else
            ret = TRUE;
    }
    return ret;
}

1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
static BOOL CRYPT_CriticalExtensionsSupported(PCCERT_CONTEXT cert)
{
    BOOL ret = TRUE;
    DWORD i;

    for (i = 0; ret && i < cert->pCertInfo->cExtension; i++)
    {
        if (cert->pCertInfo->rgExtension[i].fCritical)
        {
            LPCSTR oid = cert->pCertInfo->rgExtension[i].pszObjId;

            if (!strcmp(oid, szOID_BASIC_CONSTRAINTS))
                ret = TRUE;
            else if (!strcmp(oid, szOID_BASIC_CONSTRAINTS2))
                ret = TRUE;
            else if (!strcmp(oid, szOID_NAME_CONSTRAINTS))
                ret = TRUE;
            else if (!strcmp(oid, szOID_KEY_USAGE))
                ret = TRUE;
            else if (!strcmp(oid, szOID_SUBJECT_ALT_NAME))
                ret = TRUE;
1815 1816
            else if (!strcmp(oid, szOID_SUBJECT_ALT_NAME2))
                ret = TRUE;
1817 1818
            else if (!strcmp(oid, szOID_CERT_POLICIES))
                ret = TRUE;
1819 1820
            else if (!strcmp(oid, szOID_ENHANCED_KEY_USAGE))
                ret = TRUE;
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831
            else
            {
                FIXME("unsupported critical extension %s\n",
                 debugstr_a(oid));
                ret = FALSE;
            }
        }
    }
    return ret;
}

1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
static BOOL CRYPT_IsCertVersionValid(PCCERT_CONTEXT cert)
{
    BOOL ret = TRUE;

    /* Checks whether the contents of the cert match the cert's version. */
    switch (cert->pCertInfo->dwVersion)
    {
    case CERT_V1:
        /* A V1 cert may not contain unique identifiers.  See RFC 5280,
         * section 4.1.2.8:
         * "These fields MUST only appear if the version is 2 or 3 (Section
         *  4.1.2.1).  These fields MUST NOT appear if the version is 1."
         */
        if (cert->pCertInfo->IssuerUniqueId.cbData ||
         cert->pCertInfo->SubjectUniqueId.cbData)
            ret = FALSE;
        /* A V1 cert may not contain extensions.  See RFC 5280, section 4.1.2.9:
         * "This field MUST only appear if the version is 3 (Section 4.1.2.1)."
         */
        if (cert->pCertInfo->cExtension)
            ret = FALSE;
        break;
    case CERT_V2:
        /* A V2 cert may not contain extensions.  See RFC 5280, section 4.1.2.9:
         * "This field MUST only appear if the version is 3 (Section 4.1.2.1)."
         */
        if (cert->pCertInfo->cExtension)
            ret = FALSE;
        break;
    case CERT_V3:
        /* Do nothing, all fields are allowed for V3 certs */
        break;
    default:
        WARN_(chain)("invalid cert version %d\n", cert->pCertInfo->dwVersion);
        ret = FALSE;
    }
    return ret;
}

1871
static void CRYPT_CheckSimpleChain(PCertificateChainEngine engine,
1872 1873 1874
 PCERT_SIMPLE_CHAIN chain, LPFILETIME time)
{
    PCERT_CHAIN_ELEMENT rootElement = chain->rgpElement[chain->cElement - 1];
1875
    int i;
1876
    BOOL pathLengthConstraintViolated = FALSE;
1877
    CERT_BASIC_CONSTRAINTS2_INFO constraints = { FALSE, FALSE, 0 };
1878

1879
    TRACE_(chain)("checking chain with %d elements for time %s\n",
1880
     chain->cElement, filetime_to_str(time));
1881
    for (i = chain->cElement - 1; i >= 0; i--)
1882
    {
1883 1884
        BOOL isRoot;

1885 1886
        if (TRACE_ON(chain))
            dump_element(chain->rgpElement[i]->pCertContext);
1887 1888 1889 1890 1891
        if (i == chain->cElement - 1)
            isRoot = CRYPT_IsCertificateSelfSigned(
             chain->rgpElement[i]->pCertContext);
        else
            isRoot = FALSE;
1892 1893 1894 1895 1896 1897 1898 1899
        if (!CRYPT_IsCertVersionValid(chain->rgpElement[i]->pCertContext))
        {
            /* MS appears to accept certs whose versions don't match their
             * contents, so there isn't an appropriate error code.
             */
            chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
             CERT_TRUST_INVALID_EXTENSION;
        }
1900 1901 1902 1903
        if (CertVerifyTimeValidity(time,
         chain->rgpElement[i]->pCertContext->pCertInfo) != 0)
            chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
             CERT_TRUST_IS_NOT_TIME_VALID;
1904 1905
        if (i != 0)
        {
1906 1907 1908 1909 1910 1911 1912 1913
            /* Check the signature of the cert this issued */
            if (!CryptVerifyCertificateSignatureEx(0, X509_ASN_ENCODING,
             CRYPT_VERIFY_CERT_SIGN_SUBJECT_CERT,
             (void *)chain->rgpElement[i - 1]->pCertContext,
             CRYPT_VERIFY_CERT_SIGN_ISSUER_CERT,
             (void *)chain->rgpElement[i]->pCertContext, 0, NULL))
                chain->rgpElement[i - 1]->TrustStatus.dwErrorStatus |=
                 CERT_TRUST_IS_NOT_SIGNATURE_VALID;
1914 1915 1916 1917
            /* Once a path length constraint has been violated, every remaining
             * CA cert's basic constraints is considered invalid.
             */
            if (pathLengthConstraintViolated)
1918 1919
                chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                 CERT_TRUST_INVALID_BASIC_CONSTRAINTS;
1920
            else if (!CRYPT_CheckBasicConstraintsForCA(engine,
1921
             chain->rgpElement[i]->pCertContext, &constraints, i - 1, isRoot,
1922
             &pathLengthConstraintViolated))
1923 1924 1925 1926 1927 1928 1929 1930
                chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                 CERT_TRUST_INVALID_BASIC_CONSTRAINTS;
            else if (constraints.fPathLenConstraint &&
             constraints.dwPathLenConstraint)
            {
                /* This one's valid - decrement max length */
                constraints.dwPathLenConstraint--;
            }
1931
        }
1932 1933 1934 1935 1936 1937 1938 1939
        else
        {
            /* Check whether end cert has a basic constraints extension */
            if (!CRYPT_DecodeBasicConstraints(
             chain->rgpElement[i]->pCertContext, &constraints, FALSE))
                chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                 CERT_TRUST_INVALID_BASIC_CONSTRAINTS;
        }
1940
        if (!CRYPT_KeyUsageValid(engine, chain->rgpElement[i]->pCertContext,
1941
         isRoot, constraints.fCA, i))
1942 1943
            chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
             CERT_TRUST_IS_NOT_VALID_FOR_USAGE;
1944 1945 1946
        if (CRYPT_IsSimpleChainCyclic(chain))
        {
            /* If the chain is cyclic, then the path length constraints
1947
             * are violated, because the chain is infinitely long.
1948 1949 1950
             */
            pathLengthConstraintViolated = TRUE;
            chain->TrustStatus.dwErrorStatus |=
1951
             CERT_TRUST_IS_PARTIAL_CHAIN |
1952 1953
             CERT_TRUST_INVALID_BASIC_CONSTRAINTS;
        }
1954 1955 1956 1957
        /* Check whether every critical extension is supported */
        if (!CRYPT_CriticalExtensionsSupported(
         chain->rgpElement[i]->pCertContext))
            chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
1958 1959
             CERT_TRUST_INVALID_EXTENSION |
             CERT_TRUST_HAS_NOT_SUPPORTED_CRITICAL_EXT;
1960 1961 1962
        CRYPT_CombineTrustStatus(&chain->TrustStatus,
         &chain->rgpElement[i]->TrustStatus);
    }
1963
    CRYPT_CheckChainNameConstraints(chain);
1964
    CRYPT_CheckChainPolicies(chain);
1965 1966
    if (CRYPT_IsCertificateSelfSigned(rootElement->pCertContext))
    {
1967 1968
        rootElement->TrustStatus.dwInfoStatus |=
         CERT_TRUST_IS_SELF_SIGNED | CERT_TRUST_HAS_NAME_MATCH_ISSUER;
1969
        CRYPT_CheckRootCert(engine->hRoot, rootElement);
1970 1971 1972 1973
    }
    CRYPT_CombineTrustStatus(&chain->TrustStatus, &rootElement->TrustStatus);
}

1974
static PCCERT_CONTEXT CRYPT_GetIssuer(HCERTSTORE store, PCCERT_CONTEXT subject,
1975
 PCCERT_CONTEXT prevIssuer, DWORD *infoStatus)
1976
{
1977 1978 1979
    PCCERT_CONTEXT issuer = NULL;
    PCERT_EXTENSION ext;
    DWORD size;
1980

1981
    *infoStatus = 0;
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
    if ((ext = CertFindExtension(szOID_AUTHORITY_KEY_IDENTIFIER,
     subject->pCertInfo->cExtension, subject->pCertInfo->rgExtension)))
    {
        CERT_AUTHORITY_KEY_ID_INFO *info;
        BOOL ret;

        ret = CryptDecodeObjectEx(subject->dwCertEncodingType,
         X509_AUTHORITY_KEY_ID, ext->Value.pbData, ext->Value.cbData,
         CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
         &info, &size);
        if (ret)
        {
            CERT_ID id;

            if (info->CertIssuer.cbData && info->CertSerialNumber.cbData)
            {
                id.dwIdChoice = CERT_ID_ISSUER_SERIAL_NUMBER;
                memcpy(&id.u.IssuerSerialNumber.Issuer, &info->CertIssuer,
                 sizeof(CERT_NAME_BLOB));
                memcpy(&id.u.IssuerSerialNumber.SerialNumber,
                 &info->CertSerialNumber, sizeof(CRYPT_INTEGER_BLOB));
                issuer = CertFindCertificateInStore(store,
                 subject->dwCertEncodingType, 0, CERT_FIND_CERT_ID, &id,
                 prevIssuer);
2006
                if (issuer)
2007 2008
                {
                    TRACE_(chain)("issuer found by issuer/serial number\n");
2009
                    *infoStatus = CERT_TRUST_HAS_EXACT_MATCH_ISSUER;
2010
                }
2011 2012 2013 2014 2015 2016 2017 2018
            }
            else if (info->KeyId.cbData)
            {
                id.dwIdChoice = CERT_ID_KEY_IDENTIFIER;
                memcpy(&id.u.KeyId, &info->KeyId, sizeof(CRYPT_HASH_BLOB));
                issuer = CertFindCertificateInStore(store,
                 subject->dwCertEncodingType, 0, CERT_FIND_CERT_ID, &id,
                 prevIssuer);
2019
                if (issuer)
2020 2021
                {
                    TRACE_(chain)("issuer found by key id\n");
2022
                    *infoStatus = CERT_TRUST_HAS_KEY_MATCH_ISSUER;
2023
                }
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064
            }
            LocalFree(info);
        }
    }
    else if ((ext = CertFindExtension(szOID_AUTHORITY_KEY_IDENTIFIER2,
     subject->pCertInfo->cExtension, subject->pCertInfo->rgExtension)))
    {
        CERT_AUTHORITY_KEY_ID2_INFO *info;
        BOOL ret;

        ret = CryptDecodeObjectEx(subject->dwCertEncodingType,
         X509_AUTHORITY_KEY_ID2, ext->Value.pbData, ext->Value.cbData,
         CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
         &info, &size);
        if (ret)
        {
            CERT_ID id;

            if (info->AuthorityCertIssuer.cAltEntry &&
             info->AuthorityCertSerialNumber.cbData)
            {
                PCERT_ALT_NAME_ENTRY directoryName = NULL;
                DWORD i;

                for (i = 0; !directoryName &&
                 i < info->AuthorityCertIssuer.cAltEntry; i++)
                    if (info->AuthorityCertIssuer.rgAltEntry[i].dwAltNameChoice
                     == CERT_ALT_NAME_DIRECTORY_NAME)
                        directoryName =
                         &info->AuthorityCertIssuer.rgAltEntry[i];
                if (directoryName)
                {
                    id.dwIdChoice = CERT_ID_ISSUER_SERIAL_NUMBER;
                    memcpy(&id.u.IssuerSerialNumber.Issuer,
                     &directoryName->u.DirectoryName, sizeof(CERT_NAME_BLOB));
                    memcpy(&id.u.IssuerSerialNumber.SerialNumber,
                     &info->AuthorityCertSerialNumber,
                     sizeof(CRYPT_INTEGER_BLOB));
                    issuer = CertFindCertificateInStore(store,
                     subject->dwCertEncodingType, 0, CERT_FIND_CERT_ID, &id,
                     prevIssuer);
2065
                    if (issuer)
2066 2067
                    {
                        TRACE_(chain)("issuer found by directory name\n");
2068
                        *infoStatus = CERT_TRUST_HAS_EXACT_MATCH_ISSUER;
2069
                    }
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080
                }
                else
                    FIXME("no supported name type in authority key id2\n");
            }
            else if (info->KeyId.cbData)
            {
                id.dwIdChoice = CERT_ID_KEY_IDENTIFIER;
                memcpy(&id.u.KeyId, &info->KeyId, sizeof(CRYPT_HASH_BLOB));
                issuer = CertFindCertificateInStore(store,
                 subject->dwCertEncodingType, 0, CERT_FIND_CERT_ID, &id,
                 prevIssuer);
2081
                if (issuer)
2082 2083
                {
                    TRACE_(chain)("issuer found by key id\n");
2084
                    *infoStatus = CERT_TRUST_HAS_KEY_MATCH_ISSUER;
2085
                }
2086 2087 2088 2089 2090 2091 2092 2093 2094
            }
            LocalFree(info);
        }
    }
    else
    {
        issuer = CertFindCertificateInStore(store,
         subject->dwCertEncodingType, 0, CERT_FIND_SUBJECT_NAME,
         &subject->pCertInfo->Issuer, prevIssuer);
2095
        TRACE_(chain)("issuer found by name\n");
2096
        *infoStatus = CERT_TRUST_HAS_NAME_MATCH_ISSUER;
2097
    }
2098 2099 2100
    return issuer;
}

2101 2102 2103
/* Builds a simple chain by finding an issuer for the last cert in the chain,
 * until reaching a self-signed cert, or until no issuer can be found.
 */
2104
static BOOL CRYPT_BuildSimpleChain(const CertificateChainEngine *engine,
2105 2106 2107 2108 2109 2110 2111 2112
 HCERTSTORE world, PCERT_SIMPLE_CHAIN chain)
{
    BOOL ret = TRUE;
    PCCERT_CONTEXT cert = chain->rgpElement[chain->cElement - 1]->pCertContext;

    while (ret && !CRYPT_IsSimpleChainCyclic(chain) &&
     !CRYPT_IsCertificateSelfSigned(cert))
    {
2113 2114
        PCCERT_CONTEXT issuer = CRYPT_GetIssuer(world, cert, NULL,
         &chain->rgpElement[chain->cElement - 1]->TrustStatus.dwInfoStatus);
2115 2116 2117

        if (issuer)
        {
2118 2119
            ret = CRYPT_AddCertToSimpleChain(engine, chain, issuer,
             chain->rgpElement[chain->cElement - 1]->TrustStatus.dwInfoStatus);
2120 2121 2122 2123
            /* CRYPT_AddCertToSimpleChain add-ref's the issuer, so free it to
             * close the enumeration that found it
             */
            CertFreeCertificateContext(issuer);
2124 2125 2126 2127
            cert = issuer;
        }
        else
        {
2128
            TRACE_(chain)("Couldn't find issuer, halting chain creation\n");
2129
            chain->TrustStatus.dwErrorStatus |= CERT_TRUST_IS_PARTIAL_CHAIN;
2130 2131 2132 2133 2134 2135
            break;
        }
    }
    return ret;
}

2136 2137 2138 2139 2140 2141 2142
static LPCSTR debugstr_filetime(LPFILETIME pTime)
{
    if (!pTime)
        return "(nil)";
    return wine_dbg_sprintf("%p (%s)", pTime, filetime_to_str(pTime));
}

2143
static BOOL CRYPT_GetSimpleChainForCert(PCertificateChainEngine engine,
2144
 HCERTSTORE world, PCCERT_CONTEXT cert, LPFILETIME pTime,
2145 2146 2147 2148 2149
 PCERT_SIMPLE_CHAIN *ppChain)
{
    BOOL ret = FALSE;
    PCERT_SIMPLE_CHAIN chain;

2150
    TRACE("(%p, %p, %p, %s)\n", engine, world, cert, debugstr_filetime(pTime));
2151 2152 2153 2154 2155 2156

    chain = CryptMemAlloc(sizeof(CERT_SIMPLE_CHAIN));
    if (chain)
    {
        memset(chain, 0, sizeof(CERT_SIMPLE_CHAIN));
        chain->cbSize = sizeof(CERT_SIMPLE_CHAIN);
2157
        ret = CRYPT_AddCertToSimpleChain(engine, chain, cert, 0);
2158
        if (ret)
2159
        {
2160 2161
            ret = CRYPT_BuildSimpleChain(engine, world, chain);
            if (ret)
2162
                CRYPT_CheckSimpleChain(engine, chain, pTime);
2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
        }
        if (!ret)
        {
            CRYPT_FreeSimpleChain(chain);
            chain = NULL;
        }
        *ppChain = chain;
    }
    return ret;
}

2174
static BOOL CRYPT_BuildCandidateChainFromCert(HCERTCHAINENGINE hChainEngine,
2175
 PCCERT_CONTEXT cert, LPFILETIME pTime, HCERTSTORE hAdditionalStore,
2176 2177
 PCertificateChain *ppChain)
{
2178
    PCertificateChainEngine engine = (PCertificateChainEngine)hChainEngine;
2179
    PCERT_SIMPLE_CHAIN simpleChain = NULL;
2180
    HCERTSTORE world;
2181 2182
    BOOL ret;

2183 2184 2185 2186 2187
    world = CertOpenStore(CERT_STORE_PROV_COLLECTION, 0, 0,
     CERT_STORE_CREATE_NEW_FLAG, NULL);
    CertAddStoreToCollection(world, engine->hWorld, 0, 0);
    if (hAdditionalStore)
        CertAddStoreToCollection(world, hAdditionalStore, 0, 0);
2188 2189 2190
    /* FIXME: only simple chains are supported for now, as CTLs aren't
     * supported yet.
     */
2191
    if ((ret = CRYPT_GetSimpleChainForCert(engine, world, cert, pTime,
2192
     &simpleChain)))
2193 2194 2195 2196 2197 2198
    {
        PCertificateChain chain = CryptMemAlloc(sizeof(CertificateChain));

        if (chain)
        {
            chain->ref = 1;
2199
            chain->world = world;
2200
            chain->context.cbSize = sizeof(CERT_CHAIN_CONTEXT);
2201
            chain->context.TrustStatus = simpleChain->TrustStatus;
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216
            chain->context.cChain = 1;
            chain->context.rgpChain = CryptMemAlloc(sizeof(PCERT_SIMPLE_CHAIN));
            chain->context.rgpChain[0] = simpleChain;
            chain->context.cLowerQualityChainContext = 0;
            chain->context.rgpLowerQualityChainContext = NULL;
            chain->context.fHasRevocationFreshnessTime = FALSE;
            chain->context.dwRevocationFreshnessTime = 0;
        }
        else
            ret = FALSE;
        *ppChain = chain;
    }
    return ret;
}

2217 2218
/* Makes and returns a copy of chain, up to and including element iElement. */
static PCERT_SIMPLE_CHAIN CRYPT_CopySimpleChainToElement(
2219
 const CERT_SIMPLE_CHAIN *chain, DWORD iElement)
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242
{
    PCERT_SIMPLE_CHAIN copy = CryptMemAlloc(sizeof(CERT_SIMPLE_CHAIN));

    if (copy)
    {
        memset(copy, 0, sizeof(CERT_SIMPLE_CHAIN));
        copy->cbSize = sizeof(CERT_SIMPLE_CHAIN);
        copy->rgpElement =
         CryptMemAlloc((iElement + 1) * sizeof(PCERT_CHAIN_ELEMENT));
        if (copy->rgpElement)
        {
            DWORD i;
            BOOL ret = TRUE;

            memset(copy->rgpElement, 0,
             (iElement + 1) * sizeof(PCERT_CHAIN_ELEMENT));
            for (i = 0; ret && i <= iElement; i++)
            {
                PCERT_CHAIN_ELEMENT element =
                 CryptMemAlloc(sizeof(CERT_CHAIN_ELEMENT));

                if (element)
                {
2243
                    *element = *chain->rgpElement[i];
2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279
                    element->pCertContext = CertDuplicateCertificateContext(
                     chain->rgpElement[i]->pCertContext);
                    /* Reset the trust status of the copied element, it'll get
                     * rechecked after the new chain is done.
                     */
                    memset(&element->TrustStatus, 0, sizeof(CERT_TRUST_STATUS));
                    copy->rgpElement[copy->cElement++] = element;
                }
                else
                    ret = FALSE;
            }
            if (!ret)
            {
                for (i = 0; i <= iElement; i++)
                    CryptMemFree(copy->rgpElement[i]);
                CryptMemFree(copy->rgpElement);
                CryptMemFree(copy);
                copy = NULL;
            }
        }
        else
        {
            CryptMemFree(copy);
            copy = NULL;
        }
    }
    return copy;
}

static void CRYPT_FreeLowerQualityChains(PCertificateChain chain)
{
    DWORD i;

    for (i = 0; i < chain->context.cLowerQualityChainContext; i++)
        CertFreeCertificateChain(chain->context.rgpLowerQualityChainContext[i]);
    CryptMemFree(chain->context.rgpLowerQualityChainContext);
2280 2281
    chain->context.cLowerQualityChainContext = 0;
    chain->context.rgpLowerQualityChainContext = NULL;
2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370
}

static void CRYPT_FreeChainContext(PCertificateChain chain)
{
    DWORD i;

    CRYPT_FreeLowerQualityChains(chain);
    for (i = 0; i < chain->context.cChain; i++)
        CRYPT_FreeSimpleChain(chain->context.rgpChain[i]);
    CryptMemFree(chain->context.rgpChain);
    CertCloseStore(chain->world, 0);
    CryptMemFree(chain);
}

/* Makes and returns a copy of chain, up to and including element iElement of
 * simple chain iChain.
 */
static PCertificateChain CRYPT_CopyChainToElement(PCertificateChain chain,
 DWORD iChain, DWORD iElement)
{
    PCertificateChain copy = CryptMemAlloc(sizeof(CertificateChain));

    if (copy)
    {
        copy->ref = 1;
        copy->world = CertDuplicateStore(chain->world);
        copy->context.cbSize = sizeof(CERT_CHAIN_CONTEXT);
        /* Leave the trust status of the copied chain unset, it'll get
         * rechecked after the new chain is done.
         */
        memset(&copy->context.TrustStatus, 0, sizeof(CERT_TRUST_STATUS));
        copy->context.cLowerQualityChainContext = 0;
        copy->context.rgpLowerQualityChainContext = NULL;
        copy->context.fHasRevocationFreshnessTime = FALSE;
        copy->context.dwRevocationFreshnessTime = 0;
        copy->context.rgpChain = CryptMemAlloc(
         (iChain + 1) * sizeof(PCERT_SIMPLE_CHAIN));
        if (copy->context.rgpChain)
        {
            BOOL ret = TRUE;
            DWORD i;

            memset(copy->context.rgpChain, 0,
             (iChain + 1) * sizeof(PCERT_SIMPLE_CHAIN));
            if (iChain)
            {
                for (i = 0; ret && iChain && i < iChain - 1; i++)
                {
                    copy->context.rgpChain[i] =
                     CRYPT_CopySimpleChainToElement(chain->context.rgpChain[i],
                     chain->context.rgpChain[i]->cElement - 1);
                    if (!copy->context.rgpChain[i])
                        ret = FALSE;
                }
            }
            else
                i = 0;
            if (ret)
            {
                copy->context.rgpChain[i] =
                 CRYPT_CopySimpleChainToElement(chain->context.rgpChain[i],
                 iElement);
                if (!copy->context.rgpChain[i])
                    ret = FALSE;
            }
            if (!ret)
            {
                CRYPT_FreeChainContext(copy);
                copy = NULL;
            }
            else
                copy->context.cChain = iChain + 1;
        }
        else
        {
            CryptMemFree(copy);
            copy = NULL;
        }
    }
    return copy;
}

static PCertificateChain CRYPT_BuildAlternateContextFromChain(
 HCERTCHAINENGINE hChainEngine, LPFILETIME pTime, HCERTSTORE hAdditionalStore,
 PCertificateChain chain)
{
    PCertificateChainEngine engine = (PCertificateChainEngine)hChainEngine;
    PCertificateChain alternate;

2371 2372
    TRACE("(%p, %s, %p, %p)\n", hChainEngine, debugstr_filetime(pTime),
     hAdditionalStore, chain);
2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384

    /* Always start with the last "lower quality" chain to ensure a consistent
     * order of alternate creation:
     */
    if (chain->context.cLowerQualityChainContext)
        chain = (PCertificateChain)chain->context.rgpLowerQualityChainContext[
         chain->context.cLowerQualityChainContext - 1];
    /* A chain with only one element can't have any alternates */
    if (chain->context.cChain <= 1 && chain->context.rgpChain[0]->cElement <= 1)
        alternate = NULL;
    else
    {
2385
        DWORD i, j, infoStatus;
2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397
        PCCERT_CONTEXT alternateIssuer = NULL;

        alternate = NULL;
        for (i = 0; !alternateIssuer && i < chain->context.cChain; i++)
            for (j = 0; !alternateIssuer &&
             j < chain->context.rgpChain[i]->cElement - 1; j++)
            {
                PCCERT_CONTEXT subject =
                 chain->context.rgpChain[i]->rgpElement[j]->pCertContext;
                PCCERT_CONTEXT prevIssuer = CertDuplicateCertificateContext(
                 chain->context.rgpChain[i]->rgpElement[j + 1]->pCertContext);

2398
                alternateIssuer = CRYPT_GetIssuer(prevIssuer->hCertStore,
2399
                 subject, prevIssuer, &infoStatus);
2400 2401 2402 2403 2404 2405 2406 2407 2408
            }
        if (alternateIssuer)
        {
            i--;
            j--;
            alternate = CRYPT_CopyChainToElement(chain, i, j);
            if (alternate)
            {
                BOOL ret = CRYPT_AddCertToSimpleChain(engine,
2409
                 alternate->context.rgpChain[i], alternateIssuer, infoStatus);
2410

2411 2412 2413 2414
                /* CRYPT_AddCertToSimpleChain add-ref's the issuer, so free it
                 * to close the enumeration that found it
                 */
                CertFreeCertificateContext(alternateIssuer);
2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
                if (ret)
                {
                    ret = CRYPT_BuildSimpleChain(engine, alternate->world,
                     alternate->context.rgpChain[i]);
                    if (ret)
                        CRYPT_CheckSimpleChain(engine,
                         alternate->context.rgpChain[i], pTime);
                    CRYPT_CombineTrustStatus(&alternate->context.TrustStatus,
                     &alternate->context.rgpChain[i]->TrustStatus);
                }
                if (!ret)
                {
                    CRYPT_FreeChainContext(alternate);
                    alternate = NULL;
                }
            }
        }
    }
    TRACE("%p\n", alternate);
    return alternate;
}

2437 2438 2439 2440 2441
#define CHAIN_QUALITY_SIGNATURE_VALID   0x16
#define CHAIN_QUALITY_TIME_VALID        8
#define CHAIN_QUALITY_COMPLETE_CHAIN    4
#define CHAIN_QUALITY_BASIC_CONSTRAINTS 2
#define CHAIN_QUALITY_TRUSTED_ROOT      1
2442 2443 2444

#define CHAIN_QUALITY_HIGHEST \
 CHAIN_QUALITY_SIGNATURE_VALID | CHAIN_QUALITY_TIME_VALID | \
2445 2446
 CHAIN_QUALITY_COMPLETE_CHAIN | CHAIN_QUALITY_BASIC_CONSTRAINTS | \
 CHAIN_QUALITY_TRUSTED_ROOT
2447 2448 2449 2450

#define IS_TRUST_ERROR_SET(TrustStatus, bits) \
 (TrustStatus)->dwErrorStatus & (bits)

2451
static DWORD CRYPT_ChainQuality(const CertificateChain *chain)
2452 2453 2454 2455 2456 2457
{
    DWORD quality = CHAIN_QUALITY_HIGHEST;

    if (IS_TRUST_ERROR_SET(&chain->context.TrustStatus,
     CERT_TRUST_IS_UNTRUSTED_ROOT))
        quality &= ~CHAIN_QUALITY_TRUSTED_ROOT;
2458 2459 2460
    if (IS_TRUST_ERROR_SET(&chain->context.TrustStatus,
     CERT_TRUST_INVALID_BASIC_CONSTRAINTS))
        quality &= ~CHAIN_QUALITY_BASIC_CONSTRAINTS;
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500
    if (IS_TRUST_ERROR_SET(&chain->context.TrustStatus,
     CERT_TRUST_IS_PARTIAL_CHAIN))
        quality &= ~CHAIN_QUALITY_COMPLETE_CHAIN;
    if (IS_TRUST_ERROR_SET(&chain->context.TrustStatus,
     CERT_TRUST_IS_NOT_TIME_VALID | CERT_TRUST_IS_NOT_TIME_NESTED))
        quality &= ~CHAIN_QUALITY_TIME_VALID;
    if (IS_TRUST_ERROR_SET(&chain->context.TrustStatus,
     CERT_TRUST_IS_NOT_SIGNATURE_VALID))
        quality &= ~CHAIN_QUALITY_SIGNATURE_VALID;
    return quality;
}

/* Chooses the highest quality chain among chain and its "lower quality"
 * alternate chains.  Returns the highest quality chain, with all other
 * chains as lower quality chains of it.
 */
static PCertificateChain CRYPT_ChooseHighestQualityChain(
 PCertificateChain chain)
{
    DWORD i;

    /* There are always only two chains being considered:  chain, and an
     * alternate at chain->rgpLowerQualityChainContext[i].  If the alternate
     * has a higher quality than chain, the alternate gets assigned the lower
     * quality contexts, with chain taking the alternate's place among the
     * lower quality contexts.
     */
    for (i = 0; i < chain->context.cLowerQualityChainContext; i++)
    {
        PCertificateChain alternate =
         (PCertificateChain)chain->context.rgpLowerQualityChainContext[i];

        if (CRYPT_ChainQuality(alternate) > CRYPT_ChainQuality(chain))
        {
            alternate->context.cLowerQualityChainContext =
             chain->context.cLowerQualityChainContext;
            alternate->context.rgpLowerQualityChainContext =
             chain->context.rgpLowerQualityChainContext;
            alternate->context.rgpLowerQualityChainContext[i] =
             (PCCERT_CHAIN_CONTEXT)chain;
2501 2502
            chain->context.cLowerQualityChainContext = 0;
            chain->context.rgpLowerQualityChainContext = NULL;
2503 2504 2505 2506 2507 2508 2509
            chain = alternate;
        }
    }
    return chain;
}

static BOOL CRYPT_AddAlternateChainToChain(PCertificateChain chain,
2510
 const CertificateChain *alternate)
2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533
{
    BOOL ret;

    if (chain->context.cLowerQualityChainContext)
        chain->context.rgpLowerQualityChainContext =
         CryptMemRealloc(chain->context.rgpLowerQualityChainContext,
         (chain->context.cLowerQualityChainContext + 1) *
         sizeof(PCCERT_CHAIN_CONTEXT));
    else
        chain->context.rgpLowerQualityChainContext =
         CryptMemAlloc(sizeof(PCCERT_CHAIN_CONTEXT));
    if (chain->context.rgpLowerQualityChainContext)
    {
        chain->context.rgpLowerQualityChainContext[
         chain->context.cLowerQualityChainContext++] =
         (PCCERT_CHAIN_CONTEXT)alternate;
        ret = TRUE;
    }
    else
        ret = FALSE;
    return ret;
}

2534
static PCERT_CHAIN_ELEMENT CRYPT_FindIthElementInChain(
2535
 const CERT_CHAIN_CONTEXT *chain, DWORD i)
2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549
{
    DWORD j, iElement;
    PCERT_CHAIN_ELEMENT element = NULL;

    for (j = 0, iElement = 0; !element && j < chain->cChain; j++)
    {
        if (iElement + chain->rgpChain[j]->cElement < i)
            iElement += chain->rgpChain[j]->cElement;
        else
            element = chain->rgpChain[j]->rgpElement[i - iElement];
    }
    return element;
}

2550 2551 2552 2553 2554
typedef struct _CERT_CHAIN_PARA_NO_EXTRA_FIELDS {
    DWORD            cbSize;
    CERT_USAGE_MATCH RequestedUsage;
} CERT_CHAIN_PARA_NO_EXTRA_FIELDS, *PCERT_CHAIN_PARA_NO_EXTRA_FIELDS;

2555
static void CRYPT_VerifyChainRevocation(PCERT_CHAIN_CONTEXT chain,
2556 2557
 LPFILETIME pTime, HCERTSTORE hAdditionalStore,
 const CERT_CHAIN_PARA *pChainPara, DWORD chainFlags)
2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580
{
    DWORD cContext;

    if (chainFlags & CERT_CHAIN_REVOCATION_CHECK_END_CERT)
        cContext = 1;
    else if ((chainFlags & CERT_CHAIN_REVOCATION_CHECK_CHAIN) ||
     (chainFlags & CERT_CHAIN_REVOCATION_CHECK_CHAIN_EXCLUDE_ROOT))
    {
        DWORD i;

        for (i = 0, cContext = 0; i < chain->cChain; i++)
        {
            if (i < chain->cChain - 1 ||
             chainFlags & CERT_CHAIN_REVOCATION_CHECK_CHAIN)
                cContext += chain->rgpChain[i]->cElement;
            else
                cContext += chain->rgpChain[i]->cElement - 1;
        }
    }
    else
        cContext = 0;
    if (cContext)
    {
2581 2582 2583 2584 2585
        DWORD i, j, iContext, revocationFlags;
        CERT_REVOCATION_PARA revocationPara = { sizeof(revocationPara), 0 };
        CERT_REVOCATION_STATUS revocationStatus =
         { sizeof(revocationStatus), 0 };
        BOOL ret;
2586

2587 2588 2589 2590 2591 2592 2593
        revocationFlags = CERT_VERIFY_REV_CHAIN_FLAG;
        if (chainFlags & CERT_CHAIN_REVOCATION_CHECK_CACHE_ONLY)
            revocationFlags |= CERT_VERIFY_CACHE_ONLY_BASED_REVOCATION;
        if (chainFlags & CERT_CHAIN_REVOCATION_ACCUMULATIVE_TIMEOUT)
            revocationFlags |= CERT_VERIFY_REV_ACCUMULATIVE_TIMEOUT_FLAG;
        revocationPara.pftTimeToUse = pTime;
        if (hAdditionalStore)
2594
        {
2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611
            revocationPara.cCertStore = 1;
            revocationPara.rgCertStore = &hAdditionalStore;
            revocationPara.hCrlStore = hAdditionalStore;
        }
        if (pChainPara->cbSize == sizeof(CERT_CHAIN_PARA))
        {
            revocationPara.dwUrlRetrievalTimeout =
             pChainPara->dwUrlRetrievalTimeout;
            revocationPara.fCheckFreshnessTime =
             pChainPara->fCheckRevocationFreshnessTime;
            revocationPara.dwFreshnessTime =
             pChainPara->dwRevocationFreshnessTime;
        }
        for (i = 0, iContext = 0; iContext < cContext && i < chain->cChain; i++)
        {
            for (j = 0; iContext < cContext &&
             j < chain->rgpChain[i]->cElement; j++, iContext++)
2612
            {
2613 2614
                PCCERT_CONTEXT certToCheck =
                 chain->rgpChain[i]->rgpElement[j]->pCertContext;
2615

2616 2617 2618 2619 2620 2621 2622 2623 2624
                if (j < chain->rgpChain[i]->cElement - 1)
                    revocationPara.pIssuerCert =
                     chain->rgpChain[i]->rgpElement[j + 1]->pCertContext;
                else
                    revocationPara.pIssuerCert = NULL;
                ret = CertVerifyRevocation(X509_ASN_ENCODING,
                 CERT_CONTEXT_REVOCATION_TYPE, 1, (void **)&certToCheck,
                 revocationFlags, &revocationPara, &revocationStatus);
                if (!ret)
2625
                {
2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656
                    PCERT_CHAIN_ELEMENT element = CRYPT_FindIthElementInChain(
                     chain, iContext);
                    DWORD error;

                    switch (revocationStatus.dwError)
                    {
                    case CRYPT_E_NO_REVOCATION_CHECK:
                    case CRYPT_E_NO_REVOCATION_DLL:
                    case CRYPT_E_NOT_IN_REVOCATION_DATABASE:
                        /* If the revocation status is unknown, it's assumed
                         * to be offline too.
                         */
                        error = CERT_TRUST_REVOCATION_STATUS_UNKNOWN |
                         CERT_TRUST_IS_OFFLINE_REVOCATION;
                        break;
                    case CRYPT_E_REVOCATION_OFFLINE:
                        error = CERT_TRUST_IS_OFFLINE_REVOCATION;
                        break;
                    case CRYPT_E_REVOKED:
                        error = CERT_TRUST_IS_REVOKED;
                        break;
                    default:
                        WARN("unmapped error %08x\n", revocationStatus.dwError);
                        error = 0;
                    }
                    if (element)
                    {
                        /* FIXME: set element's pRevocationInfo member */
                        element->TrustStatus.dwErrorStatus |= error;
                    }
                    chain->TrustStatus.dwErrorStatus |= error;
2657 2658 2659 2660 2661
                }
            }
        }
    }
}
2662

2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749
static void CRYPT_CheckUsages(PCERT_CHAIN_CONTEXT chain,
 const CERT_CHAIN_PARA *pChainPara)
{
    if (pChainPara->cbSize >= sizeof(CERT_CHAIN_PARA_NO_EXTRA_FIELDS) &&
     pChainPara->RequestedUsage.Usage.cUsageIdentifier)
    {
        PCCERT_CONTEXT endCert;
        PCERT_EXTENSION ext;
        BOOL validForUsage;

        /* A chain, if created, always includes the end certificate */
        endCert = chain->rgpChain[0]->rgpElement[0]->pCertContext;
        /* The extended key usage extension specifies how a certificate's
         * public key may be used.  From RFC 5280, section 4.2.1.12:
         * "This extension indicates one or more purposes for which the
         *  certified public key may be used, in addition to or in place of the
         *  basic purposes indicated in the key usage extension."
         * If the extension is present, it only satisfies the requested usage
         * if that usage is included in the extension:
         * "If the extension is present, then the certificate MUST only be used
         *  for one of the purposes indicated."
         * There is also the special anyExtendedKeyUsage OID, but it doesn't
         * have to be respected:
         * "Applications that require the presence of a particular purpose
         *  MAY reject certificates that include the anyExtendedKeyUsage OID
         *  but not the particular OID expected for the application."
         * For now, I'm being more conservative and ignoring the presence of
         * the anyExtendedKeyUsage OID.
         */
        if ((ext = CertFindExtension(szOID_ENHANCED_KEY_USAGE,
         endCert->pCertInfo->cExtension, endCert->pCertInfo->rgExtension)))
        {
            const CERT_ENHKEY_USAGE *requestedUsage =
             &pChainPara->RequestedUsage.Usage;
            CERT_ENHKEY_USAGE *usage;
            DWORD size;

            if (CryptDecodeObjectEx(X509_ASN_ENCODING,
             X509_ENHANCED_KEY_USAGE, ext->Value.pbData, ext->Value.cbData,
             CRYPT_DECODE_ALLOC_FLAG, NULL, &usage, &size))
            {
                if (pChainPara->RequestedUsage.dwType == USAGE_MATCH_TYPE_AND)
                {
                    DWORD i, j;

                    /* For AND matches, all usages must be present */
                    validForUsage = TRUE;
                    for (i = 0; validForUsage &&
                     i < requestedUsage->cUsageIdentifier; i++)
                    {
                        BOOL match = FALSE;

                        for (j = 0; !match && j < usage->cUsageIdentifier; j++)
                            match = !strcmp(usage->rgpszUsageIdentifier[j],
                             requestedUsage->rgpszUsageIdentifier[i]);
                        if (!match)
                            validForUsage = FALSE;
                    }
                }
                else
                {
                    DWORD i, j;

                    /* For OR matches, any matching usage suffices */
                    validForUsage = FALSE;
                    for (i = 0; !validForUsage &&
                     i < requestedUsage->cUsageIdentifier; i++)
                    {
                        for (j = 0; !validForUsage &&
                         j < usage->cUsageIdentifier; j++)
                            validForUsage =
                             !strcmp(usage->rgpszUsageIdentifier[j],
                             requestedUsage->rgpszUsageIdentifier[i]);
                    }
                }
                LocalFree(usage);
            }
            else
                validForUsage = FALSE;
        }
        else
        {
            /* If the extension isn't present, any interpretation is valid:
             * "Certificate using applications MAY require that the extended
             *  key usage extension be present and that a particular purpose
             *  be indicated in order for the certificate to be acceptable to
             *  that application."
2750 2751
             * Not all web sites include the extended key usage extension, so
             * accept chains without it.
2752
             */
2753 2754
            TRACE_(chain)("requested usage from certificate with no usages\n");
            validForUsage = TRUE;
2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768
        }
        if (!validForUsage)
        {
            chain->TrustStatus.dwErrorStatus |=
             CERT_TRUST_IS_NOT_VALID_FOR_USAGE;
            chain->rgpChain[0]->rgpElement[0]->TrustStatus.dwErrorStatus |=
             CERT_TRUST_IS_NOT_VALID_FOR_USAGE;
        }
    }
    if (pChainPara->cbSize >= sizeof(CERT_CHAIN_PARA) &&
     pChainPara->RequestedIssuancePolicy.Usage.cUsageIdentifier)
        FIXME("unimplemented for RequestedIssuancePolicy\n");
}

2769 2770
static void dump_usage_match(LPCSTR name, const CERT_USAGE_MATCH *usageMatch)
{
2771 2772 2773
    if (usageMatch->Usage.cUsageIdentifier)
    {
        DWORD i;
2774

2775 2776 2777 2778 2779
        TRACE_(chain)("%s: %s\n", name,
         usageMatch->dwType == USAGE_MATCH_TYPE_AND ? "AND" : "OR");
        for (i = 0; i < usageMatch->Usage.cUsageIdentifier; i++)
            TRACE_(chain)("%s\n", usageMatch->Usage.rgpszUsageIdentifier[i]);
    }
2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796
}

static void dump_chain_para(const CERT_CHAIN_PARA *pChainPara)
{
    TRACE_(chain)("%d\n", pChainPara->cbSize);
    if (pChainPara->cbSize >= sizeof(CERT_CHAIN_PARA_NO_EXTRA_FIELDS))
        dump_usage_match("RequestedUsage", &pChainPara->RequestedUsage);
    if (pChainPara->cbSize >= sizeof(CERT_CHAIN_PARA))
    {
        dump_usage_match("RequestedIssuancePolicy",
         &pChainPara->RequestedIssuancePolicy);
        TRACE_(chain)("%d\n", pChainPara->dwUrlRetrievalTimeout);
        TRACE_(chain)("%d\n", pChainPara->fCheckRevocationFreshnessTime);
        TRACE_(chain)("%d\n", pChainPara->dwRevocationFreshnessTime);
    }
}

2797 2798 2799 2800 2801
BOOL WINAPI CertGetCertificateChain(HCERTCHAINENGINE hChainEngine,
 PCCERT_CONTEXT pCertContext, LPFILETIME pTime, HCERTSTORE hAdditionalStore,
 PCERT_CHAIN_PARA pChainPara, DWORD dwFlags, LPVOID pvReserved,
 PCCERT_CHAIN_CONTEXT* ppChainContext)
{
2802
    BOOL ret;
2803
    PCertificateChain chain = NULL;
2804

2805 2806 2807
    TRACE("(%p, %p, %s, %p, %p, %08x, %p, %p)\n", hChainEngine, pCertContext,
     debugstr_filetime(pTime), hAdditionalStore, pChainPara, dwFlags,
     pvReserved, ppChainContext);
2808

2809 2810
    if (ppChainContext)
        *ppChainContext = NULL;
2811 2812 2813 2814 2815
    if (!pChainPara)
    {
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
2816 2817 2818 2819 2820
    if (!pCertContext->pCertInfo->SignatureAlgorithm.pszObjId)
    {
        SetLastError(ERROR_INVALID_DATA);
        return FALSE;
    }
2821

2822 2823
    if (!hChainEngine)
        hChainEngine = CRYPT_GetDefaultChainEngine();
2824 2825
    if (TRACE_ON(chain))
        dump_chain_para(pChainPara);
2826
    /* FIXME: what about HCCE_LOCAL_MACHINE? */
2827 2828 2829
    ret = CRYPT_BuildCandidateChainFromCert(hChainEngine, pCertContext, pTime,
     hAdditionalStore, &chain);
    if (ret)
2830
    {
2831
        PCertificateChain alternate = NULL;
2832
        PCERT_CHAIN_CONTEXT pChain;
2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847

        do {
            alternate = CRYPT_BuildAlternateContextFromChain(hChainEngine,
             pTime, hAdditionalStore, chain);

            /* Alternate contexts are added as "lower quality" contexts of
             * chain, to avoid loops in alternate chain creation.
             * The highest-quality chain is chosen at the end.
             */
            if (alternate)
                ret = CRYPT_AddAlternateChainToChain(chain, alternate);
        } while (ret && alternate);
        chain = CRYPT_ChooseHighestQualityChain(chain);
        if (!(dwFlags & CERT_CHAIN_RETURN_LOWER_QUALITY_CONTEXTS))
            CRYPT_FreeLowerQualityChains(chain);
2848
        pChain = (PCERT_CHAIN_CONTEXT)chain;
2849 2850
        CRYPT_VerifyChainRevocation(pChain, pTime, hAdditionalStore,
         pChainPara, dwFlags);
2851
        CRYPT_CheckUsages(pChain, pChainPara);
2852 2853
        TRACE_(chain)("error status: %08x\n",
         pChain->TrustStatus.dwErrorStatus);
2854
        if (ppChainContext)
2855
            *ppChainContext = pChain;
2856
        else
2857
            CertFreeCertificateChain(pChain);
2858 2859 2860 2861 2862
    }
    TRACE("returning %d\n", ret);
    return ret;
}

2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874
PCCERT_CHAIN_CONTEXT WINAPI CertDuplicateCertificateChain(
 PCCERT_CHAIN_CONTEXT pChainContext)
{
    PCertificateChain chain = (PCertificateChain)pChainContext;

    TRACE("(%p)\n", pChainContext);

    if (chain)
        InterlockedIncrement(&chain->ref);
    return pChainContext;
}

2875
VOID WINAPI CertFreeCertificateChain(PCCERT_CHAIN_CONTEXT pChainContext)
2876
{
2877 2878 2879 2880 2881 2882 2883 2884 2885
    PCertificateChain chain = (PCertificateChain)pChainContext;

    TRACE("(%p)\n", pChainContext);

    if (chain)
    {
        if (InterlockedDecrement(&chain->ref) == 0)
            CRYPT_FreeChainContext(chain);
    }
2886
}
2887

2888 2889 2890 2891 2892 2893 2894 2895 2896
PCCERT_CHAIN_CONTEXT WINAPI CertFindChainInStore(HCERTSTORE store,
 DWORD certEncodingType, DWORD findFlags, DWORD findType,
 const void *findPara, PCCERT_CHAIN_CONTEXT prevChainContext)
{
    FIXME("(%p, %08x, %08x, %d, %p, %p): stub\n", store, certEncodingType,
     findFlags, findType, findPara, prevChainContext);
    return NULL;
}

2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916
static void find_element_with_error(PCCERT_CHAIN_CONTEXT chain, DWORD error,
 LONG *iChain, LONG *iElement)
{
    DWORD i, j;

    for (i = 0; i < chain->cChain; i++)
        for (j = 0; j < chain->rgpChain[i]->cElement; j++)
            if (chain->rgpChain[i]->rgpElement[j]->TrustStatus.dwErrorStatus &
             error)
            {
                *iChain = i;
                *iElement = j;
                return;
            }
}

static BOOL WINAPI verify_base_policy(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus)
{
2917 2918 2919 2920
    DWORD checks = 0;

    if (pPolicyPara)
        checks = pPolicyPara->dwFlags;
2921
    pPolicyStatus->lChainIndex = pPolicyStatus->lElementIndex = -1;
2922
    pPolicyStatus->dwError = NO_ERROR;
2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938
    if (pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_IS_NOT_SIGNATURE_VALID)
    {
        pPolicyStatus->dwError = TRUST_E_CERT_SIGNATURE;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_NOT_SIGNATURE_VALID, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
    else if (pChainContext->TrustStatus.dwErrorStatus & CERT_TRUST_IS_CYCLIC)
    {
        pPolicyStatus->dwError = CERT_E_CHAINING;
        find_element_with_error(pChainContext, CERT_TRUST_IS_CYCLIC,
         &pPolicyStatus->lChainIndex, &pPolicyStatus->lElementIndex);
        /* For a cyclic chain, which element is a cycle isn't meaningful */
        pPolicyStatus->lElementIndex = -1;
    }
2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965
    if (!pPolicyStatus->dwError &&
     pChainContext->TrustStatus.dwErrorStatus & CERT_TRUST_IS_UNTRUSTED_ROOT &&
     !(checks & CERT_CHAIN_POLICY_ALLOW_UNKNOWN_CA_FLAG))
    {
        pPolicyStatus->dwError = CERT_E_UNTRUSTEDROOT;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_UNTRUSTED_ROOT, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
    if (!pPolicyStatus->dwError &&
     pChainContext->TrustStatus.dwErrorStatus & CERT_TRUST_IS_NOT_TIME_VALID)
    {
        pPolicyStatus->dwError = CERT_E_EXPIRED;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_NOT_TIME_VALID, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
    if (!pPolicyStatus->dwError &&
     pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_IS_NOT_VALID_FOR_USAGE &&
     !(checks & CERT_CHAIN_POLICY_IGNORE_WRONG_USAGE_FLAG))
    {
        pPolicyStatus->dwError = CERT_E_WRONG_USAGE;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_NOT_VALID_FOR_USAGE, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
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    if (!pPolicyStatus->dwError &&
     pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_HAS_NOT_SUPPORTED_CRITICAL_EXT &&
     !(checks & CERT_CHAIN_POLICY_IGNORE_NOT_SUPPORTED_CRITICAL_EXT_FLAG))
    {
        pPolicyStatus->dwError = CERT_E_CRITICAL;
        find_element_with_error(pChainContext,
         CERT_TRUST_HAS_NOT_SUPPORTED_CRITICAL_EXT, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
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    return TRUE;
}

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static BYTE msTestPubKey1[] = {
0x30,0x47,0x02,0x40,0x81,0x55,0x22,0xb9,0x8a,0xa4,0x6f,0xed,0xd6,0xe7,0xd9,
0x66,0x0f,0x55,0xbc,0xd7,0xcd,0xd5,0xbc,0x4e,0x40,0x02,0x21,0xa2,0xb1,0xf7,
0x87,0x30,0x85,0x5e,0xd2,0xf2,0x44,0xb9,0xdc,0x9b,0x75,0xb6,0xfb,0x46,0x5f,
0x42,0xb6,0x9d,0x23,0x36,0x0b,0xde,0x54,0x0f,0xcd,0xbd,0x1f,0x99,0x2a,0x10,
0x58,0x11,0xcb,0x40,0xcb,0xb5,0xa7,0x41,0x02,0x03,0x01,0x00,0x01 };
static BYTE msTestPubKey2[] = {
0x30,0x47,0x02,0x40,0x9c,0x50,0x05,0x1d,0xe2,0x0e,0x4c,0x53,0xd8,0xd9,0xb5,
0xe5,0xfd,0xe9,0xe3,0xad,0x83,0x4b,0x80,0x08,0xd9,0xdc,0xe8,0xe8,0x35,0xf8,
0x11,0xf1,0xe9,0x9b,0x03,0x7a,0x65,0x64,0x76,0x35,0xce,0x38,0x2c,0xf2,0xb6,
0x71,0x9e,0x06,0xd9,0xbf,0xbb,0x31,0x69,0xa3,0xf6,0x30,0xa0,0x78,0x7b,0x18,
0xdd,0x50,0x4d,0x79,0x1e,0xeb,0x61,0xc1,0x02,0x03,0x01,0x00,0x01 };

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static void dump_authenticode_extra_chain_policy_para(
 AUTHENTICODE_EXTRA_CERT_CHAIN_POLICY_PARA *extraPara)
{
    if (extraPara)
    {
        TRACE_(chain)("cbSize = %d\n", extraPara->cbSize);
        TRACE_(chain)("dwRegPolicySettings = %08x\n",
         extraPara->dwRegPolicySettings);
        TRACE_(chain)("pSignerInfo = %p\n", extraPara->pSignerInfo);
    }
}

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static BOOL WINAPI verify_authenticode_policy(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus)
{
    BOOL ret = verify_base_policy(szPolicyOID, pChainContext, pPolicyPara,
     pPolicyStatus);
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    AUTHENTICODE_EXTRA_CERT_CHAIN_POLICY_PARA *extraPara = NULL;
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    if (pPolicyPara)
        extraPara = pPolicyPara->pvExtraPolicyPara;
    if (TRACE_ON(chain))
        dump_authenticode_extra_chain_policy_para(extraPara);
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    if (ret && pPolicyStatus->dwError == CERT_E_UNTRUSTEDROOT)
    {
        CERT_PUBLIC_KEY_INFO msPubKey = { { 0 } };
        BOOL isMSTestRoot = FALSE;
        PCCERT_CONTEXT failingCert =
         pChainContext->rgpChain[pPolicyStatus->lChainIndex]->
         rgpElement[pPolicyStatus->lElementIndex]->pCertContext;
        DWORD i;
        CRYPT_DATA_BLOB keyBlobs[] = {
         { sizeof(msTestPubKey1), msTestPubKey1 },
         { sizeof(msTestPubKey2), msTestPubKey2 },
        };

        /* Check whether the root is an MS test root */
        for (i = 0; !isMSTestRoot && i < sizeof(keyBlobs) / sizeof(keyBlobs[0]);
         i++)
        {
            msPubKey.PublicKey.cbData = keyBlobs[i].cbData;
            msPubKey.PublicKey.pbData = keyBlobs[i].pbData;
            if (CertComparePublicKeyInfo(
             X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
             &failingCert->pCertInfo->SubjectPublicKeyInfo, &msPubKey))
                isMSTestRoot = TRUE;
        }
        if (isMSTestRoot)
            pPolicyStatus->dwError = CERT_E_UNTRUSTEDTESTROOT;
    }
    return ret;
}

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static BOOL WINAPI verify_basic_constraints_policy(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus)
{
    pPolicyStatus->lChainIndex = pPolicyStatus->lElementIndex = -1;
    if (pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_INVALID_BASIC_CONSTRAINTS)
    {
        pPolicyStatus->dwError = TRUST_E_BASIC_CONSTRAINTS;
        find_element_with_error(pChainContext,
         CERT_TRUST_INVALID_BASIC_CONSTRAINTS, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
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    else
        pPolicyStatus->dwError = NO_ERROR;
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    return TRUE;
}

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static BOOL match_dns_to_subject_alt_name(const CERT_EXTENSION *ext,
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 LPCWSTR server_name)
{
    BOOL matches = FALSE;
    CERT_ALT_NAME_INFO *subjectName;
    DWORD size;

    TRACE_(chain)("%s\n", debugstr_w(server_name));
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    /* This could be spoofed by the embedded NULL vulnerability, since the
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     * returned CERT_ALT_NAME_INFO doesn't have a way to indicate the
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     * encoded length of a name.  Fortunately CryptDecodeObjectEx fails if
     * the encoded form of the name contains a NULL.
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     */
    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_ALTERNATE_NAME,
     ext->Value.pbData, ext->Value.cbData,
     CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
     &subjectName, &size))
    {
        DWORD i;

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        /* RFC 5280 states that multiple instances of each name type may exist,
         * in section 4.2.1.6:
         * "Multiple name forms, and multiple instances of each name form,
         *  MAY be included."
Juan Lang's avatar
Juan Lang committed
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         * It doesn't specify the behavior in such cases, but both RFC 2818
         * and RFC 2595 explicitly accept a certificate if any name matches.
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         */
        for (i = 0; !matches && i < subjectName->cAltEntry; i++)
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        {
            if (subjectName->rgAltEntry[i].dwAltNameChoice ==
             CERT_ALT_NAME_DNS_NAME)
            {
                TRACE_(chain)("dNSName: %s\n", debugstr_w(
                 subjectName->rgAltEntry[i].u.pwszDNSName));
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                if (subjectName->rgAltEntry[i].u.pwszDNSName[0] == '*')
                {
                    LPCWSTR server_name_dot;

                    /* Matching a wildcard: a wildcard matches a single name
                     * component, which is terminated by a dot.  RFC 1034
                     * doesn't define whether multiple wildcards are allowed,
                     * but I will assume that they are not until proven
                     * otherwise.  RFC 1034 also states that 'the "*" label
                     * always matches at least one whole label and sometimes
                     * more, but always whole labels.'  Native crypt32 does not
                     * match more than one label with a wildcard, so I do the
                     * same here.  Thus, a wildcard only accepts the first
                     * label, then requires an exact match of the remaining
                     * string.
                     */
                    server_name_dot = strchrW(server_name, '.');
                    if (server_name_dot)
                    {
                        if (!strcmpiW(server_name_dot,
                         subjectName->rgAltEntry[i].u.pwszDNSName + 1))
                            matches = TRUE;
                    }
                }
                else if (!strcmpiW(server_name,
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                 subjectName->rgAltEntry[i].u.pwszDNSName))
                    matches = TRUE;
            }
        }
        LocalFree(subjectName);
    }
    return matches;
}

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static BOOL find_matching_domain_component(const CERT_NAME_INFO *name,
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 LPCWSTR component)
{
    BOOL matches = FALSE;
    DWORD i, j;

    for (i = 0; !matches && i < name->cRDN; i++)
        for (j = 0; j < name->rgRDN[i].cRDNAttr; j++)
            if (!strcmp(szOID_DOMAIN_COMPONENT,
             name->rgRDN[i].rgRDNAttr[j].pszObjId))
            {
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                const CERT_RDN_ATTR *attr;
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                attr = &name->rgRDN[i].rgRDNAttr[j];
                /* Compare with memicmpW rather than strcmpiW in order to avoid
                 * a match with a string with an embedded NULL.  The component
                 * must match one domain component attribute's entire string
                 * value with a case-insensitive match.
                 */
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                matches = !memicmpW(component, (LPCWSTR)attr->Value.pbData,
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                 attr->Value.cbData / sizeof(WCHAR));
            }
    return matches;
}

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static BOOL match_domain_component(LPCWSTR allowed_component, DWORD allowed_len,
 LPCWSTR server_component, DWORD server_len, BOOL allow_wildcards,
 BOOL *see_wildcard)
{
    LPCWSTR allowed_ptr, server_ptr;
    BOOL matches = TRUE;

    *see_wildcard = FALSE;
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    if (server_len < allowed_len)
    {
        WARN_(chain)("domain component %s too short for %s\n",
         debugstr_wn(server_component, server_len),
         debugstr_wn(allowed_component, allowed_len));
        /* A domain component can't contain a wildcard character, so a domain
         * component shorter than the allowed string can't produce a match.
         */
        return FALSE;
    }
    for (allowed_ptr = allowed_component, server_ptr = server_component;
         matches && allowed_ptr - allowed_component < allowed_len;
         allowed_ptr++, server_ptr++)
    {
        if (*allowed_ptr == '*')
        {
            if (allowed_ptr - allowed_component < allowed_len - 1)
            {
                WARN_(chain)("non-wildcard characters after wildcard not supported\n");
                matches = FALSE;
            }
            else if (!allow_wildcards)
            {
                WARN_(chain)("wildcard after non-wildcard component\n");
                matches = FALSE;
            }
            else
            {
                /* the preceding characters must have matched, so the rest of
                 * the component also matches.
                 */
                *see_wildcard = TRUE;
                break;
            }
        }
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        if (matches)
            matches = tolowerW(*allowed_ptr) == tolowerW(*server_ptr);
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    }
    if (matches && server_ptr - server_component < server_len)
    {
        /* If there are unmatched characters in the server domain component,
         * the server domain only matches if the allowed string ended in a '*'.
         */
        matches = *allowed_ptr == '*';
    }
    return matches;
}

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static BOOL match_common_name(LPCWSTR server_name, const CERT_RDN_ATTR *nameAttr)
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{
    LPCWSTR allowed = (LPCWSTR)nameAttr->Value.pbData;
    LPCWSTR allowed_component = allowed;
    DWORD allowed_len = nameAttr->Value.cbData / sizeof(WCHAR);
    LPCWSTR server_component = server_name;
    DWORD server_len = strlenW(server_name);
    BOOL matches = TRUE, allow_wildcards = TRUE;

    TRACE_(chain)("CN = %s\n", debugstr_wn(allowed_component, allowed_len));

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    /* Remove trailing NULLs from the allowed name; while they shouldn't appear
     * in a certificate in the first place, they sometimes do, and they should
     * be ignored.
     */
    while (allowed_len && allowed_component[allowed_len - 1] == 0)
      allowed_len--;

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    /* From RFC 2818 (HTTP over TLS), section 3.1:
     * "Names may contain the wildcard character * which is considered to match
     *  any single domain name component or component fragment. E.g.,
     *  *.a.com matches foo.a.com but not bar.foo.a.com. f*.com matches foo.com
     *  but not bar.com."
     *
     * And from RFC 2595 (Using TLS with IMAP, POP3 and ACAP), section 2.4:
     * "A "*" wildcard character MAY be used as the left-most name component in
     *  the certificate.  For example, *.example.com would match a.example.com,
     *  foo.example.com, etc. but would not match example.com."
     *
     * There are other protocols which use TLS, and none of them is
     * authoritative.  This accepts certificates in common usage, e.g.
     * *.domain.com matches www.domain.com but not domain.com, and
     * www*.domain.com matches www1.domain.com but not mail.domain.com.
     */
    do {
        LPCWSTR allowed_dot, server_dot;

        allowed_dot = memchrW(allowed_component, '.',
         allowed_len - (allowed_component - allowed));
        server_dot = memchrW(server_component, '.',
         server_len - (server_component - server_name));
        /* The number of components must match */
        if ((!allowed_dot && server_dot) || (allowed_dot && !server_dot))
        {
            if (!allowed_dot)
                WARN_(chain)("%s: too many components for CN=%s\n",
                 debugstr_w(server_name), debugstr_wn(allowed, allowed_len));
            else
                WARN_(chain)("%s: not enough components for CN=%s\n",
                 debugstr_w(server_name), debugstr_wn(allowed, allowed_len));
            matches = FALSE;
        }
        else
        {
            LPCWSTR allowed_end, server_end;
            BOOL has_wildcard;

            allowed_end = allowed_dot ? allowed_dot : allowed + allowed_len;
            server_end = server_dot ? server_dot : server_name + server_len;
            matches = match_domain_component(allowed_component,
             allowed_end - allowed_component, server_component,
             server_end - server_component, allow_wildcards, &has_wildcard);
            /* Once a non-wildcard component is seen, no wildcard components
             * may follow
             */
            if (!has_wildcard)
                allow_wildcards = FALSE;
            if (matches)
            {
                allowed_component = allowed_dot ? allowed_dot + 1 : allowed_end;
                server_component = server_dot ? server_dot + 1 : server_end;
            }
        }
    } while (matches && allowed_component &&
     allowed_component - allowed < allowed_len &&
     server_component && server_component - server_name < server_len);
    TRACE_(chain)("returning %d\n", matches);
    return matches;
}

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static BOOL match_dns_to_subject_dn(PCCERT_CONTEXT cert, LPCWSTR server_name)
{
    BOOL matches = FALSE;
    CERT_NAME_INFO *name;
    DWORD size;

    TRACE_(chain)("%s\n", debugstr_w(server_name));
    if (CryptDecodeObjectEx(X509_ASN_ENCODING, X509_UNICODE_NAME,
     cert->pCertInfo->Subject.pbData, cert->pCertInfo->Subject.cbData,
     CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
     &name, &size))
    {
        /* If the subject distinguished name contains any name components,
         * make sure all of them are present.
         */
        if (CertFindRDNAttr(szOID_DOMAIN_COMPONENT, name))
        {
            LPCWSTR ptr = server_name;

            do {
                LPCWSTR dot = strchrW(ptr, '.'), end;
                /* 254 is the maximum DNS label length, see RFC 1035 */
                WCHAR component[255];
                DWORD len;

                end = dot ? dot : ptr + strlenW(ptr);
                len = end - ptr;
                if (len >= sizeof(component) / sizeof(component[0]))
                {
                    WARN_(chain)("domain component %s too long\n",
                     debugstr_wn(ptr, len));
                    matches = FALSE;
                }
                else
                {
                    memcpy(component, ptr, len * sizeof(WCHAR));
                    component[len] = 0;
                    matches = find_matching_domain_component(name, component);
                }
                ptr = dot ? dot + 1 : end;
            } while (matches && ptr && *ptr);
        }
        else
        {
3338
            DWORD i, j;
3339 3340

            /* If the certificate isn't using a DN attribute in the name, make
3341 3342 3343 3344 3345
             * make sure at least one common name matches.  From RFC 2818,
             * section 3.1:
             * "If more than one identity of a given type is present in the
             * certificate (e.g., more than one dNSName name, a match in any
             * one of the set is considered acceptable.)"
3346
             */
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            for (i = 0; !matches && i < name->cRDN; i++)
                for (j = 0; !matches && j < name->rgRDN[i].cRDNAttr; j++)
                {
                    PCERT_RDN_ATTR attr = &name->rgRDN[i].rgRDNAttr[j];

                    if (attr->pszObjId && !strcmp(szOID_COMMON_NAME,
                     attr->pszObjId))
                        matches = match_common_name(server_name, attr);
                }
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        }
        LocalFree(name);
    }
    return matches;
}

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static void dump_ssl_extra_chain_policy_para(HTTPSPolicyCallbackData *sslPara)
{
    if (sslPara)
    {
        TRACE_(chain)("cbSize = %d\n", sslPara->u.cbSize);
        TRACE_(chain)("dwAuthType = %d\n", sslPara->dwAuthType);
        TRACE_(chain)("fdwChecks = %08x\n", sslPara->fdwChecks);
        TRACE_(chain)("pwszServerName = %s\n",
         debugstr_w(sslPara->pwszServerName));
    }
}

3374 3375 3376 3377
static BOOL WINAPI verify_ssl_policy(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus)
{
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    HTTPSPolicyCallbackData *sslPara = NULL;
    DWORD checks = 0;

    if (pPolicyPara)
        sslPara = pPolicyPara->pvExtraPolicyPara;
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    if (TRACE_ON(chain))
        dump_ssl_extra_chain_policy_para(sslPara);
3385 3386
    if (sslPara && sslPara->u.cbSize >= sizeof(HTTPSPolicyCallbackData))
        checks = sslPara->fdwChecks;
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    pPolicyStatus->lChainIndex = pPolicyStatus->lElementIndex = -1;
    if (pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_IS_NOT_SIGNATURE_VALID)
    {
        pPolicyStatus->dwError = TRUST_E_CERT_SIGNATURE;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_NOT_SIGNATURE_VALID, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
    else if (pChainContext->TrustStatus.dwErrorStatus &
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     CERT_TRUST_IS_UNTRUSTED_ROOT &&
     !(checks & SECURITY_FLAG_IGNORE_UNKNOWN_CA))
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    {
        pPolicyStatus->dwError = CERT_E_UNTRUSTEDROOT;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_UNTRUSTED_ROOT, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
    else if (pChainContext->TrustStatus.dwErrorStatus & CERT_TRUST_IS_CYCLIC)
    {
        pPolicyStatus->dwError = CERT_E_UNTRUSTEDROOT;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_CYCLIC, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
        /* For a cyclic chain, which element is a cycle isn't meaningful */
        pPolicyStatus->lElementIndex = -1;
    }
    else if (pChainContext->TrustStatus.dwErrorStatus &
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     CERT_TRUST_IS_NOT_TIME_VALID &&
     !(checks & SECURITY_FLAG_IGNORE_CERT_DATE_INVALID))
3417 3418 3419 3420 3421 3422
    {
        pPolicyStatus->dwError = CERT_E_EXPIRED;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_NOT_TIME_VALID, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
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    else if (pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_IS_NOT_VALID_FOR_USAGE &&
     !(checks & SECURITY_FLAG_IGNORE_WRONG_USAGE))
    {
        pPolicyStatus->dwError = CERT_E_WRONG_USAGE;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_NOT_VALID_FOR_USAGE, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
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    else if (pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_IS_REVOKED && !(checks & SECURITY_FLAG_IGNORE_REVOCATION))
    {
        pPolicyStatus->dwError = CERT_E_REVOKED;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_REVOKED, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
    else if (pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_IS_OFFLINE_REVOCATION &&
     !(checks & SECURITY_FLAG_IGNORE_REVOCATION))
    {
        pPolicyStatus->dwError = CERT_E_REVOCATION_FAILURE;
        find_element_with_error(pChainContext,
         CERT_TRUST_IS_OFFLINE_REVOCATION, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
3449 3450 3451 3452 3453 3454 3455 3456
    else if (pChainContext->TrustStatus.dwErrorStatus &
     CERT_TRUST_HAS_NOT_SUPPORTED_CRITICAL_EXT)
    {
        pPolicyStatus->dwError = CERT_E_CRITICAL;
        find_element_with_error(pChainContext,
         CERT_TRUST_HAS_NOT_SUPPORTED_CRITICAL_EXT, &pPolicyStatus->lChainIndex,
         &pPolicyStatus->lElementIndex);
    }
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    else
        pPolicyStatus->dwError = NO_ERROR;
    /* We only need bother checking whether the name in the end certificate
     * matches if the chain is otherwise okay.
     */
    if (!pPolicyStatus->dwError && pPolicyPara &&
     pPolicyPara->cbSize >= sizeof(CERT_CHAIN_POLICY_PARA))
    {
        if (sslPara && sslPara->u.cbSize >= sizeof(HTTPSPolicyCallbackData))
        {
            if (sslPara->dwAuthType == AUTHTYPE_SERVER &&
3468
             sslPara->pwszServerName &&
3469
             !(checks & SECURITY_FLAG_IGNORE_CERT_CN_INVALID))
3470 3471 3472 3473 3474 3475
            {
                PCCERT_CONTEXT cert;
                PCERT_EXTENSION altNameExt;
                BOOL matches;

                cert = pChainContext->rgpChain[0]->rgpElement[0]->pCertContext;
3476
                altNameExt = get_subject_alt_name_ext(cert->pCertInfo);
3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504
                /* If the alternate name extension exists, the name it contains
                 * is bound to the certificate, so make sure the name matches
                 * it.  Otherwise, look for the server name in the subject
                 * distinguished name.  RFC5280, section 4.2.1.6:
                 * "Whenever such identities are to be bound into a
                 *  certificate, the subject alternative name (or issuer
                 *  alternative name) extension MUST be used; however, a DNS
                 *  name MAY also be represented in the subject field using the
                 *  domainComponent attribute."
                 */
                if (altNameExt)
                    matches = match_dns_to_subject_alt_name(altNameExt,
                     sslPara->pwszServerName);
                else
                    matches = match_dns_to_subject_dn(cert,
                     sslPara->pwszServerName);
                if (!matches)
                {
                    pPolicyStatus->dwError = CERT_E_CN_NO_MATCH;
                    pPolicyStatus->lChainIndex = 0;
                    pPolicyStatus->lElementIndex = 0;
                }
            }
        }
    }
    return TRUE;
}

3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618
static BYTE msPubKey1[] = {
0x30,0x82,0x01,0x0a,0x02,0x82,0x01,0x01,0x00,0xdf,0x08,0xba,0xe3,0x3f,0x6e,
0x64,0x9b,0xf5,0x89,0xaf,0x28,0x96,0x4a,0x07,0x8f,0x1b,0x2e,0x8b,0x3e,0x1d,
0xfc,0xb8,0x80,0x69,0xa3,0xa1,0xce,0xdb,0xdf,0xb0,0x8e,0x6c,0x89,0x76,0x29,
0x4f,0xca,0x60,0x35,0x39,0xad,0x72,0x32,0xe0,0x0b,0xae,0x29,0x3d,0x4c,0x16,
0xd9,0x4b,0x3c,0x9d,0xda,0xc5,0xd3,0xd1,0x09,0xc9,0x2c,0x6f,0xa6,0xc2,0x60,
0x53,0x45,0xdd,0x4b,0xd1,0x55,0xcd,0x03,0x1c,0xd2,0x59,0x56,0x24,0xf3,0xe5,
0x78,0xd8,0x07,0xcc,0xd8,0xb3,0x1f,0x90,0x3f,0xc0,0x1a,0x71,0x50,0x1d,0x2d,
0xa7,0x12,0x08,0x6d,0x7c,0xb0,0x86,0x6c,0xc7,0xba,0x85,0x32,0x07,0xe1,0x61,
0x6f,0xaf,0x03,0xc5,0x6d,0xe5,0xd6,0xa1,0x8f,0x36,0xf6,0xc1,0x0b,0xd1,0x3e,
0x69,0x97,0x48,0x72,0xc9,0x7f,0xa4,0xc8,0xc2,0x4a,0x4c,0x7e,0xa1,0xd1,0x94,
0xa6,0xd7,0xdc,0xeb,0x05,0x46,0x2e,0xb8,0x18,0xb4,0x57,0x1d,0x86,0x49,0xdb,
0x69,0x4a,0x2c,0x21,0xf5,0x5e,0x0f,0x54,0x2d,0x5a,0x43,0xa9,0x7a,0x7e,0x6a,
0x8e,0x50,0x4d,0x25,0x57,0xa1,0xbf,0x1b,0x15,0x05,0x43,0x7b,0x2c,0x05,0x8d,
0xbd,0x3d,0x03,0x8c,0x93,0x22,0x7d,0x63,0xea,0x0a,0x57,0x05,0x06,0x0a,0xdb,
0x61,0x98,0x65,0x2d,0x47,0x49,0xa8,0xe7,0xe6,0x56,0x75,0x5c,0xb8,0x64,0x08,
0x63,0xa9,0x30,0x40,0x66,0xb2,0xf9,0xb6,0xe3,0x34,0xe8,0x67,0x30,0xe1,0x43,
0x0b,0x87,0xff,0xc9,0xbe,0x72,0x10,0x5e,0x23,0xf0,0x9b,0xa7,0x48,0x65,0xbf,
0x09,0x88,0x7b,0xcd,0x72,0xbc,0x2e,0x79,0x9b,0x7b,0x02,0x03,0x01,0x00,0x01 };
static BYTE msPubKey2[] = {
0x30,0x82,0x01,0x0a,0x02,0x82,0x01,0x01,0x00,0xa9,0x02,0xbd,0xc1,0x70,0xe6,
0x3b,0xf2,0x4e,0x1b,0x28,0x9f,0x97,0x78,0x5e,0x30,0xea,0xa2,0xa9,0x8d,0x25,
0x5f,0xf8,0xfe,0x95,0x4c,0xa3,0xb7,0xfe,0x9d,0xa2,0x20,0x3e,0x7c,0x51,0xa2,
0x9b,0xa2,0x8f,0x60,0x32,0x6b,0xd1,0x42,0x64,0x79,0xee,0xac,0x76,0xc9,0x54,
0xda,0xf2,0xeb,0x9c,0x86,0x1c,0x8f,0x9f,0x84,0x66,0xb3,0xc5,0x6b,0x7a,0x62,
0x23,0xd6,0x1d,0x3c,0xde,0x0f,0x01,0x92,0xe8,0x96,0xc4,0xbf,0x2d,0x66,0x9a,
0x9a,0x68,0x26,0x99,0xd0,0x3a,0x2c,0xbf,0x0c,0xb5,0x58,0x26,0xc1,0x46,0xe7,
0x0a,0x3e,0x38,0x96,0x2c,0xa9,0x28,0x39,0xa8,0xec,0x49,0x83,0x42,0xe3,0x84,
0x0f,0xbb,0x9a,0x6c,0x55,0x61,0xac,0x82,0x7c,0xa1,0x60,0x2d,0x77,0x4c,0xe9,
0x99,0xb4,0x64,0x3b,0x9a,0x50,0x1c,0x31,0x08,0x24,0x14,0x9f,0xa9,0xe7,0x91,
0x2b,0x18,0xe6,0x3d,0x98,0x63,0x14,0x60,0x58,0x05,0x65,0x9f,0x1d,0x37,0x52,
0x87,0xf7,0xa7,0xef,0x94,0x02,0xc6,0x1b,0xd3,0xbf,0x55,0x45,0xb3,0x89,0x80,
0xbf,0x3a,0xec,0x54,0x94,0x4e,0xae,0xfd,0xa7,0x7a,0x6d,0x74,0x4e,0xaf,0x18,
0xcc,0x96,0x09,0x28,0x21,0x00,0x57,0x90,0x60,0x69,0x37,0xbb,0x4b,0x12,0x07,
0x3c,0x56,0xff,0x5b,0xfb,0xa4,0x66,0x0a,0x08,0xa6,0xd2,0x81,0x56,0x57,0xef,
0xb6,0x3b,0x5e,0x16,0x81,0x77,0x04,0xda,0xf6,0xbe,0xae,0x80,0x95,0xfe,0xb0,
0xcd,0x7f,0xd6,0xa7,0x1a,0x72,0x5c,0x3c,0xca,0xbc,0xf0,0x08,0xa3,0x22,0x30,
0xb3,0x06,0x85,0xc9,0xb3,0x20,0x77,0x13,0x85,0xdf,0x02,0x03,0x01,0x00,0x01 };
static BYTE msPubKey3[] = {
0x30,0x82,0x02,0x0a,0x02,0x82,0x02,0x01,0x00,0xf3,0x5d,0xfa,0x80,0x67,0xd4,
0x5a,0xa7,0xa9,0x0c,0x2c,0x90,0x20,0xd0,0x35,0x08,0x3c,0x75,0x84,0xcd,0xb7,
0x07,0x89,0x9c,0x89,0xda,0xde,0xce,0xc3,0x60,0xfa,0x91,0x68,0x5a,0x9e,0x94,
0x71,0x29,0x18,0x76,0x7c,0xc2,0xe0,0xc8,0x25,0x76,0x94,0x0e,0x58,0xfa,0x04,
0x34,0x36,0xe6,0xdf,0xaf,0xf7,0x80,0xba,0xe9,0x58,0x0b,0x2b,0x93,0xe5,0x9d,
0x05,0xe3,0x77,0x22,0x91,0xf7,0x34,0x64,0x3c,0x22,0x91,0x1d,0x5e,0xe1,0x09,
0x90,0xbc,0x14,0xfe,0xfc,0x75,0x58,0x19,0xe1,0x79,0xb7,0x07,0x92,0xa3,0xae,
0x88,0x59,0x08,0xd8,0x9f,0x07,0xca,0x03,0x58,0xfc,0x68,0x29,0x6d,0x32,0xd7,
0xd2,0xa8,0xcb,0x4b,0xfc,0xe1,0x0b,0x48,0x32,0x4f,0xe6,0xeb,0xb8,0xad,0x4f,
0xe4,0x5c,0x6f,0x13,0x94,0x99,0xdb,0x95,0xd5,0x75,0xdb,0xa8,0x1a,0xb7,0x94,
0x91,0xb4,0x77,0x5b,0xf5,0x48,0x0c,0x8f,0x6a,0x79,0x7d,0x14,0x70,0x04,0x7d,
0x6d,0xaf,0x90,0xf5,0xda,0x70,0xd8,0x47,0xb7,0xbf,0x9b,0x2f,0x6c,0xe7,0x05,
0xb7,0xe1,0x11,0x60,0xac,0x79,0x91,0x14,0x7c,0xc5,0xd6,0xa6,0xe4,0xe1,0x7e,
0xd5,0xc3,0x7e,0xe5,0x92,0xd2,0x3c,0x00,0xb5,0x36,0x82,0xde,0x79,0xe1,0x6d,
0xf3,0xb5,0x6e,0xf8,0x9f,0x33,0xc9,0xcb,0x52,0x7d,0x73,0x98,0x36,0xdb,0x8b,
0xa1,0x6b,0xa2,0x95,0x97,0x9b,0xa3,0xde,0xc2,0x4d,0x26,0xff,0x06,0x96,0x67,
0x25,0x06,0xc8,0xe7,0xac,0xe4,0xee,0x12,0x33,0x95,0x31,0x99,0xc8,0x35,0x08,
0x4e,0x34,0xca,0x79,0x53,0xd5,0xb5,0xbe,0x63,0x32,0x59,0x40,0x36,0xc0,0xa5,
0x4e,0x04,0x4d,0x3d,0xdb,0x5b,0x07,0x33,0xe4,0x58,0xbf,0xef,0x3f,0x53,0x64,
0xd8,0x42,0x59,0x35,0x57,0xfd,0x0f,0x45,0x7c,0x24,0x04,0x4d,0x9e,0xd6,0x38,
0x74,0x11,0x97,0x22,0x90,0xce,0x68,0x44,0x74,0x92,0x6f,0xd5,0x4b,0x6f,0xb0,
0x86,0xe3,0xc7,0x36,0x42,0xa0,0xd0,0xfc,0xc1,0xc0,0x5a,0xf9,0xa3,0x61,0xb9,
0x30,0x47,0x71,0x96,0x0a,0x16,0xb0,0x91,0xc0,0x42,0x95,0xef,0x10,0x7f,0x28,
0x6a,0xe3,0x2a,0x1f,0xb1,0xe4,0xcd,0x03,0x3f,0x77,0x71,0x04,0xc7,0x20,0xfc,
0x49,0x0f,0x1d,0x45,0x88,0xa4,0xd7,0xcb,0x7e,0x88,0xad,0x8e,0x2d,0xec,0x45,
0xdb,0xc4,0x51,0x04,0xc9,0x2a,0xfc,0xec,0x86,0x9e,0x9a,0x11,0x97,0x5b,0xde,
0xce,0x53,0x88,0xe6,0xe2,0xb7,0xfd,0xac,0x95,0xc2,0x28,0x40,0xdb,0xef,0x04,
0x90,0xdf,0x81,0x33,0x39,0xd9,0xb2,0x45,0xa5,0x23,0x87,0x06,0xa5,0x55,0x89,
0x31,0xbb,0x06,0x2d,0x60,0x0e,0x41,0x18,0x7d,0x1f,0x2e,0xb5,0x97,0xcb,0x11,
0xeb,0x15,0xd5,0x24,0xa5,0x94,0xef,0x15,0x14,0x89,0xfd,0x4b,0x73,0xfa,0x32,
0x5b,0xfc,0xd1,0x33,0x00,0xf9,0x59,0x62,0x70,0x07,0x32,0xea,0x2e,0xab,0x40,
0x2d,0x7b,0xca,0xdd,0x21,0x67,0x1b,0x30,0x99,0x8f,0x16,0xaa,0x23,0xa8,0x41,
0xd1,0xb0,0x6e,0x11,0x9b,0x36,0xc4,0xde,0x40,0x74,0x9c,0xe1,0x58,0x65,0xc1,
0x60,0x1e,0x7a,0x5b,0x38,0xc8,0x8f,0xbb,0x04,0x26,0x7c,0xd4,0x16,0x40,0xe5,
0xb6,0x6b,0x6c,0xaa,0x86,0xfd,0x00,0xbf,0xce,0xc1,0x35,0x02,0x03,0x01,0x00,
0x01 };

static BOOL WINAPI verify_ms_root_policy(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus)
{
    BOOL ret = verify_base_policy(szPolicyOID, pChainContext, pPolicyPara,
     pPolicyStatus);

    if (ret && !pPolicyStatus->dwError)
    {
        CERT_PUBLIC_KEY_INFO msPubKey = { { 0 } };
        BOOL isMSRoot = FALSE;
        DWORD i;
        CRYPT_DATA_BLOB keyBlobs[] = {
         { sizeof(msPubKey1), msPubKey1 },
         { sizeof(msPubKey2), msPubKey2 },
         { sizeof(msPubKey3), msPubKey3 },
        };
        PCERT_SIMPLE_CHAIN rootChain =
         pChainContext->rgpChain[pChainContext->cChain -1 ];
        PCCERT_CONTEXT root =
         rootChain->rgpElement[rootChain->cElement - 1]->pCertContext;

        for (i = 0; !isMSRoot && i < sizeof(keyBlobs) / sizeof(keyBlobs[0]);
         i++)
        {
            msPubKey.PublicKey.cbData = keyBlobs[i].cbData;
            msPubKey.PublicKey.pbData = keyBlobs[i].pbData;
            if (CertComparePublicKeyInfo(
             X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
             &root->pCertInfo->SubjectPublicKeyInfo, &msPubKey))
                isMSRoot = TRUE;
        }
        if (isMSRoot)
            pPolicyStatus->lChainIndex = pPolicyStatus->lElementIndex = 0;
    }
    return ret;
}

3619 3620 3621 3622
typedef BOOL (WINAPI *CertVerifyCertificateChainPolicyFunc)(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus);

3623 3624 3625 3626 3627 3628 3629 3630 3631 3632
static void dump_policy_para(PCERT_CHAIN_POLICY_PARA para)
{
    if (para)
    {
        TRACE_(chain)("cbSize = %d\n", para->cbSize);
        TRACE_(chain)("dwFlags = %08x\n", para->dwFlags);
        TRACE_(chain)("pvExtraPolicyPara = %p\n", para->pvExtraPolicyPara);
    }
}

3633 3634 3635 3636
BOOL WINAPI CertVerifyCertificateChainPolicy(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus)
{
3637 3638 3639 3640 3641 3642
    static HCRYPTOIDFUNCSET set = NULL;
    BOOL ret = FALSE;
    CertVerifyCertificateChainPolicyFunc verifyPolicy = NULL;
    HCRYPTOIDFUNCADDR hFunc = NULL;

    TRACE("(%s, %p, %p, %p)\n", debugstr_a(szPolicyOID), pChainContext,
3643
     pPolicyPara, pPolicyStatus);
3644 3645
    if (TRACE_ON(chain))
        dump_policy_para(pPolicyPara);
3646

3647
    if (IS_INTOID(szPolicyOID))
3648 3649 3650
    {
        switch (LOWORD(szPolicyOID))
        {
3651
        case LOWORD(CERT_CHAIN_POLICY_BASE):
3652 3653
            verifyPolicy = verify_base_policy;
            break;
3654
        case LOWORD(CERT_CHAIN_POLICY_AUTHENTICODE):
3655 3656
            verifyPolicy = verify_authenticode_policy;
            break;
3657 3658 3659
        case LOWORD(CERT_CHAIN_POLICY_SSL):
            verifyPolicy = verify_ssl_policy;
            break;
3660
        case LOWORD(CERT_CHAIN_POLICY_BASIC_CONSTRAINTS):
3661 3662
            verifyPolicy = verify_basic_constraints_policy;
            break;
3663
        case LOWORD(CERT_CHAIN_POLICY_MICROSOFT_ROOT):
3664 3665
            verifyPolicy = verify_ms_root_policy;
            break;
3666 3667 3668 3669 3670 3671 3672 3673 3674 3675
        default:
            FIXME("unimplemented for %d\n", LOWORD(szPolicyOID));
        }
    }
    if (!verifyPolicy)
    {
        if (!set)
            set = CryptInitOIDFunctionSet(
             CRYPT_OID_VERIFY_CERTIFICATE_CHAIN_POLICY_FUNC, 0);
        CryptGetOIDFunctionAddress(set, X509_ASN_ENCODING, szPolicyOID, 0,
3676
         (void **)&verifyPolicy, &hFunc);
3677 3678 3679 3680 3681 3682
    }
    if (verifyPolicy)
        ret = verifyPolicy(szPolicyOID, pChainContext, pPolicyPara,
         pPolicyStatus);
    if (hFunc)
        CryptFreeOIDFunctionAddress(hFunc, 0);
3683
    TRACE("returning %d (%08x)\n", ret, pPolicyStatus->dwError);
3684
    return ret;
3685
}