chain.c 69.5 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"
#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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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;
        BYTE hash[20];
        DWORD size;

        do {
            cert = CertEnumCertificatesInStore(store, cert);
            if (cert)
            {
                size = sizeof(hash);

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

                    check = CertFindCertificateInStore(rootStore,
                     cert->dwCertEncodingType, 0, CERT_FIND_SHA1_HASH, &blob,
                     NULL);
                    if (!check)
                        ret = FALSE;
                    else
                        CertFreeCertificateContext(check);
                }
            }
        } 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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}

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

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

    if (pConfig->cbSize != sizeof(*pConfig))
    {
        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->hRestrictedRoot)
            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 inline BOOL CRYPT_IsCertificateSelfSigned(PCCERT_CONTEXT cert)
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{
    return CertCompareCertificateName(cert->dwCertEncodingType,
     &cert->pCertInfo->Subject, &cert->pCertInfo->Issuer);
}

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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)
{
    BYTE hash[20];
    DWORD size = sizeof(hash);
    CRYPT_HASH_BLOB blob = { sizeof(hash), hash };
    PCCERT_CONTEXT trustedRoot;

    CertGetCertificateContextProperty(rootElement->pCertContext,
     CERT_HASH_PROP_ID, hash, &size);
    trustedRoot = CertFindCertificateInStore(hRoot,
     rootElement->pCertContext->dwCertEncodingType, 0, CERT_FIND_SHA1_HASH,
     &blob, NULL);
    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.  A root certificate is assumed to be
 * allowed to be a CA whether or not the basic constraints extension is present,
 * whereas an intermediate CA cert is not.  This matches the expected usage in
 * RFC 3280:  a conforming intermediate CA MUST contain the basic constraints
 * extension.  It also appears to match Microsoft's implementation.
 * 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.
 */
static BOOL CRYPT_CheckBasicConstraintsForCA(PCCERT_CONTEXT cert,
 CERT_BASIC_CONSTRAINTS2_INFO *chainConstraints, DWORD remainingCAs,
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 BOOL isRoot, BOOL *pathLengthConstraintViolated)
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{
    BOOL validBasicConstraints;
    CERT_BASIC_CONSTRAINTS2_INFO constraints;

    if ((validBasicConstraints = CRYPT_DecodeBasicConstraints(cert,
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     &constraints, isRoot)))
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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 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 */
    else if (constraint[0] == '.')
    {
        if (lstrlenW(name) > lstrlenW(constraint))
            match = !lstrcmpiW(name + lstrlenW(name) - lstrlenW(constraint),
             constraint);
    }
    else
        match = !lstrcmpiW(constraint, name);
    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 */
    else if ((at = strchrW(constraint, '@')))
        match = !lstrcmpiW(constraint, name);
    else
    {
        if ((at = strchrW(name, '@')))
            match = url_matches(constraint, at + 1, trustErrorStatus);
        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 */
    else if (lstrlenW(name) >= lstrlenW(constraint))
        match = !lstrcmpiW(name + lstrlenW(name) - lstrlenW(constraint),
         constraint);
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    /* else:  name is too short, no match */

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    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);

    if (constraint->cbData != sizeof(DWORD) * 2)
        *trustErrorStatus |= CERT_TRUST_INVALID_NAME_CONSTRAINTS;
    else if (name->cbData == sizeof(DWORD))
    {
        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);
    }
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    /* else: name is wrong size, no match */

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    return match;
}

static void CRYPT_FindMatchingNameEntry(const CERT_ALT_NAME_ENTRY *constraint,
 const CERT_ALT_NAME_INFO *subjectName, DWORD *trustErrorStatus,
 DWORD errorIfFound, DWORD errorIfNotFound)
{
    DWORD i;
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    BOOL match = FALSE;
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    for (i = 0; i < subjectName->cAltEntry; i++)
    {
        if (subjectName->rgAltEntry[i].dwAltNameChoice ==
         constraint->dwAltNameChoice)
        {
            switch (constraint->dwAltNameChoice)
            {
            case CERT_ALT_NAME_RFC822_NAME:
                match = rfc822_name_matches(constraint->u.pwszURL,
                 subjectName->rgAltEntry[i].u.pwszURL, trustErrorStatus);
                break;
            case CERT_ALT_NAME_DNS_NAME:
                match = dns_name_matches(constraint->u.pwszURL,
                 subjectName->rgAltEntry[i].u.pwszURL, trustErrorStatus);
                break;
            case CERT_ALT_NAME_URL:
                match = url_matches(constraint->u.pwszURL,
                 subjectName->rgAltEntry[i].u.pwszURL, trustErrorStatus);
                break;
            case CERT_ALT_NAME_IP_ADDRESS:
                match = ip_address_matches(&constraint->u.IPAddress,
                 &subjectName->rgAltEntry[i].u.IPAddress, trustErrorStatus);
                break;
            case CERT_ALT_NAME_DIRECTORY_NAME:
            default:
                ERR("name choice %d unsupported in this context\n",
                 constraint->dwAltNameChoice);
                *trustErrorStatus |=
                 CERT_TRUST_HAS_NOT_SUPPORTED_NAME_CONSTRAINT;
            }
        }
    }
    *trustErrorStatus |= match ? errorIfFound : errorIfNotFound;
}

static void CRYPT_CheckNameConstraints(
 const CERT_NAME_CONSTRAINTS_INFO *nameConstraints, const CERT_INFO *cert,
 DWORD *trustErrorStatus)
{
    /* If there aren't any existing constraints, don't bother checking */
    if (nameConstraints->cPermittedSubtree || nameConstraints->cExcludedSubtree)
    {
        CERT_EXTENSION *ext;

        if ((ext = CertFindExtension(szOID_SUBJECT_ALT_NAME, cert->cExtension,
         cert->rgExtension)))
        {
            CERT_ALT_NAME_INFO *subjectName;
            DWORD size;

            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;

                for (i = 0; i < nameConstraints->cExcludedSubtree; i++)
                    CRYPT_FindMatchingNameEntry(
                     &nameConstraints->rgExcludedSubtree[i].Base, subjectName,
                     trustErrorStatus,
                     CERT_TRUST_HAS_EXCLUDED_NAME_CONSTRAINT, 0);
                for (i = 0; i < nameConstraints->cPermittedSubtree; i++)
                    CRYPT_FindMatchingNameEntry(
                     &nameConstraints->rgPermittedSubtree[i].Base, subjectName,
                     trustErrorStatus,
                     0, CERT_TRUST_HAS_NOT_PERMITTED_NAME_CONSTRAINT);
                LocalFree(subjectName);
            }
        }
        else
        {
            if (nameConstraints->cPermittedSubtree)
                *trustErrorStatus |=
                 CERT_TRUST_HAS_NOT_PERMITTED_NAME_CONSTRAINT;
            if (nameConstraints->cExcludedSubtree)
                *trustErrorStatus |=
                 CERT_TRUST_HAS_EXCLUDED_NAME_CONSTRAINT;
        }
    }
}

/* 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;
}

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)))
        {
            for (j = i - 1; j >= 0; j--)
            {
                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,
                     chain->rgpElement[i]->pCertContext->pCertInfo,
                     &errorStatus);
                    chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                     errorStatus;
                }
            }
            LocalFree(nameConstraints);
        }
    }
}

723
static void dump_basic_constraints(const CERT_EXTENSION *ext)
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
{
    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);
    }
}

740
static void dump_basic_constraints2(const CERT_EXTENSION *ext)
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756
{
    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);
    }
}

757
static void dump_extension(const CERT_EXTENSION *ext)
758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
{
    TRACE_(chain)("%s (%scritical)\n", debugstr_a(ext->pszObjId),
     ext->fCritical ? "" : "not ");
    if (!strcmp(ext->pszObjId, szOID_BASIC_CONSTRAINTS))
        dump_basic_constraints(ext);
    else if (!strcmp(ext->pszObjId, szOID_BASIC_CONSTRAINTS2))
        dump_basic_constraints2(ext);
}

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

    if (!time) return NULL;

    GetLocaleInfoW(LOCALE_SYSTEM_DEFAULT, LOCALE_SSHORTDATE, dateFmt,
     sizeof(dateFmt) / sizeof(dateFmt[0]));
    FileTimeToSystemTime(time, &sysTime);
    GetDateFormatW(LOCALE_SYSTEM_DEFAULT, 0, &sysTime, dateFmt, date,
     sizeof(date) / sizeof(date[0]));
    return date;
}

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

    TRACE_(chain)("%p\n", cert);
    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);
    }
809 810
    TRACE_(chain)("valid from %s to %s\n",
     debugstr_w(filetime_to_str(&cert->pCertInfo->NotBefore)),
811 812 813 814 815 816
     debugstr_w(filetime_to_str(&cert->pCertInfo->NotAfter)));
    TRACE_(chain)("%d extensions\n", cert->pCertInfo->cExtension);
    for (i = 0; i < cert->pCertInfo->cExtension; i++)
        dump_extension(&cert->pCertInfo->rgExtension[i]);
}

817
static void CRYPT_CheckSimpleChain(PCertificateChainEngine engine,
818 819 820
 PCERT_SIMPLE_CHAIN chain, LPFILETIME time)
{
    PCERT_CHAIN_ELEMENT rootElement = chain->rgpElement[chain->cElement - 1];
821
    int i;
822
    BOOL pathLengthConstraintViolated = FALSE;
823
    CERT_BASIC_CONSTRAINTS2_INFO constraints = { TRUE, FALSE, 0 };
824

825 826
    TRACE_(chain)("checking chain with %d elements for time %s\n",
     chain->cElement, debugstr_w(filetime_to_str(time)));
827
    for (i = chain->cElement - 1; i >= 0; i--)
828
    {
829 830
        if (TRACE_ON(chain))
            dump_element(chain->rgpElement[i]->pCertContext);
831 832 833 834
        if (CertVerifyTimeValidity(time,
         chain->rgpElement[i]->pCertContext->pCertInfo) != 0)
            chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
             CERT_TRUST_IS_NOT_TIME_VALID;
835 836
        if (i != 0)
        {
837 838 839 840 841 842 843
            BOOL isRoot;

            if (i == chain->cElement - 1)
                isRoot = CRYPT_IsCertificateSelfSigned(
                 chain->rgpElement[i]->pCertContext);
            else
                isRoot = FALSE;
844 845 846 847 848 849 850 851
            /* 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;
852 853 854 855
            /* Once a path length constraint has been violated, every remaining
             * CA cert's basic constraints is considered invalid.
             */
            if (pathLengthConstraintViolated)
856 857
                chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
                 CERT_TRUST_INVALID_BASIC_CONSTRAINTS;
858 859
            else if (!CRYPT_CheckBasicConstraintsForCA(
             chain->rgpElement[i]->pCertContext, &constraints, i - 1,
860
             isRoot, &pathLengthConstraintViolated))
861 862 863 864 865 866 867 868
                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--;
            }
869
        }
870 871 872
        if (CRYPT_IsSimpleChainCyclic(chain))
        {
            /* If the chain is cyclic, then the path length constraints
873
             * are violated, because the chain is infinitely long.
874 875 876
             */
            pathLengthConstraintViolated = TRUE;
            chain->TrustStatus.dwErrorStatus |=
877
             CERT_TRUST_IS_PARTIAL_CHAIN |
878 879
             CERT_TRUST_INVALID_BASIC_CONSTRAINTS;
        }
880
        /* FIXME: check valid usages */
881 882 883
        CRYPT_CombineTrustStatus(&chain->TrustStatus,
         &chain->rgpElement[i]->TrustStatus);
    }
884
    CRYPT_CheckChainNameConstraints(chain);
885 886
    if (CRYPT_IsCertificateSelfSigned(rootElement->pCertContext))
    {
887 888
        rootElement->TrustStatus.dwInfoStatus |=
         CERT_TRUST_IS_SELF_SIGNED | CERT_TRUST_HAS_NAME_MATCH_ISSUER;
889
        CRYPT_CheckRootCert(engine->hRoot, rootElement);
890 891 892 893
    }
    CRYPT_CombineTrustStatus(&chain->TrustStatus, &rootElement->TrustStatus);
}

894
static PCCERT_CONTEXT CRYPT_GetIssuer(HCERTSTORE store, PCCERT_CONTEXT subject,
895
 PCCERT_CONTEXT prevIssuer, DWORD *infoStatus)
896
{
897 898 899
    PCCERT_CONTEXT issuer = NULL;
    PCERT_EXTENSION ext;
    DWORD size;
900

901
    *infoStatus = 0;
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925
    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);
926 927
                if (issuer)
                    *infoStatus = CERT_TRUST_HAS_EXACT_MATCH_ISSUER;
928 929 930 931 932 933 934 935
            }
            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);
936 937
                if (issuer)
                    *infoStatus = CERT_TRUST_HAS_KEY_MATCH_ISSUER;
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978
            }
            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);
979 980
                    if (issuer)
                        *infoStatus = CERT_TRUST_HAS_EXACT_MATCH_ISSUER;
981 982 983 984 985 986 987 988 989 990 991
                }
                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);
992 993
                if (issuer)
                    *infoStatus = CERT_TRUST_HAS_KEY_MATCH_ISSUER;
994 995 996 997 998 999 1000 1001 1002
            }
            LocalFree(info);
        }
    }
    else
    {
        issuer = CertFindCertificateInStore(store,
         subject->dwCertEncodingType, 0, CERT_FIND_SUBJECT_NAME,
         &subject->pCertInfo->Issuer, prevIssuer);
1003
        *infoStatus = CERT_TRUST_HAS_NAME_MATCH_ISSUER;
1004
    }
1005 1006 1007
    return issuer;
}

1008 1009 1010
/* 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.
 */
1011
static BOOL CRYPT_BuildSimpleChain(const CertificateChainEngine *engine,
1012 1013 1014 1015 1016 1017 1018 1019
 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))
    {
1020 1021
        PCCERT_CONTEXT issuer = CRYPT_GetIssuer(world, cert, NULL,
         &chain->rgpElement[chain->cElement - 1]->TrustStatus.dwInfoStatus);
1022 1023 1024

        if (issuer)
        {
1025 1026
            ret = CRYPT_AddCertToSimpleChain(engine, chain, issuer,
             chain->rgpElement[chain->cElement - 1]->TrustStatus.dwInfoStatus);
1027 1028 1029 1030
            /* CRYPT_AddCertToSimpleChain add-ref's the issuer, so free it to
             * close the enumeration that found it
             */
            CertFreeCertificateContext(issuer);
1031 1032 1033 1034
            cert = issuer;
        }
        else
        {
1035
            TRACE_(chain)("Couldn't find issuer, halting chain creation\n");
1036
            chain->TrustStatus.dwErrorStatus |= CERT_TRUST_IS_PARTIAL_CHAIN;
1037 1038 1039 1040 1041 1042 1043
            break;
        }
    }
    return ret;
}

static BOOL CRYPT_GetSimpleChainForCert(PCertificateChainEngine engine,
1044
 HCERTSTORE world, PCCERT_CONTEXT cert, LPFILETIME pTime,
1045 1046 1047 1048 1049
 PCERT_SIMPLE_CHAIN *ppChain)
{
    BOOL ret = FALSE;
    PCERT_SIMPLE_CHAIN chain;

1050
    TRACE("(%p, %p, %p, %p)\n", engine, world, cert, pTime);
1051 1052 1053 1054 1055 1056

    chain = CryptMemAlloc(sizeof(CERT_SIMPLE_CHAIN));
    if (chain)
    {
        memset(chain, 0, sizeof(CERT_SIMPLE_CHAIN));
        chain->cbSize = sizeof(CERT_SIMPLE_CHAIN);
1057
        ret = CRYPT_AddCertToSimpleChain(engine, chain, cert, 0);
1058
        if (ret)
1059
        {
1060 1061
            ret = CRYPT_BuildSimpleChain(engine, world, chain);
            if (ret)
1062
                CRYPT_CheckSimpleChain(engine, chain, pTime);
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
        }
        if (!ret)
        {
            CRYPT_FreeSimpleChain(chain);
            chain = NULL;
        }
        *ppChain = chain;
    }
    return ret;
}

1074
static BOOL CRYPT_BuildCandidateChainFromCert(HCERTCHAINENGINE hChainEngine,
1075
 PCCERT_CONTEXT cert, LPFILETIME pTime, HCERTSTORE hAdditionalStore,
1076 1077
 PCertificateChain *ppChain)
{
1078
    PCertificateChainEngine engine = (PCertificateChainEngine)hChainEngine;
1079
    PCERT_SIMPLE_CHAIN simpleChain = NULL;
1080
    HCERTSTORE world;
1081 1082
    BOOL ret;

1083 1084 1085 1086 1087
    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);
1088 1089 1090
    /* FIXME: only simple chains are supported for now, as CTLs aren't
     * supported yet.
     */
1091
    if ((ret = CRYPT_GetSimpleChainForCert(engine, world, cert, pTime,
1092
     &simpleChain)))
1093 1094 1095 1096 1097 1098
    {
        PCertificateChain chain = CryptMemAlloc(sizeof(CertificateChain));

        if (chain)
        {
            chain->ref = 1;
1099
            chain->world = world;
1100
            chain->context.cbSize = sizeof(CERT_CHAIN_CONTEXT);
1101
            chain->context.TrustStatus = simpleChain->TrustStatus;
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
            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;
}

1117 1118
/* Makes and returns a copy of chain, up to and including element iElement. */
static PCERT_SIMPLE_CHAIN CRYPT_CopySimpleChainToElement(
1119
 const CERT_SIMPLE_CHAIN *chain, DWORD iElement)
1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
{
    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)
                {
1143
                    *element = *chain->rgpElement[i];
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
                    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);
1180 1181
    chain->context.cLowerQualityChainContext = 0;
    chain->context.rgpLowerQualityChainContext = NULL;
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 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 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
}

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;

    TRACE("(%p, %p, %p, %p)\n", hChainEngine, pTime, hAdditionalStore, chain);

    /* 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
    {
1284
        DWORD i, j, infoStatus;
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
        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);

1297
                alternateIssuer = CRYPT_GetIssuer(prevIssuer->hCertStore,
1298
                 subject, prevIssuer, &infoStatus);
1299 1300 1301 1302 1303 1304 1305 1306 1307
            }
        if (alternateIssuer)
        {
            i--;
            j--;
            alternate = CRYPT_CopyChainToElement(chain, i, j);
            if (alternate)
            {
                BOOL ret = CRYPT_AddCertToSimpleChain(engine,
1308
                 alternate->context.rgpChain[i], alternateIssuer, infoStatus);
1309

1310 1311 1312 1313
                /* CRYPT_AddCertToSimpleChain add-ref's the issuer, so free it
                 * to close the enumeration that found it
                 */
                CertFreeCertificateContext(alternateIssuer);
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
                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;
}

#define CHAIN_QUALITY_SIGNATURE_VALID 8
#define CHAIN_QUALITY_TIME_VALID      4
#define CHAIN_QUALITY_COMPLETE_CHAIN  2
#define CHAIN_QUALITY_TRUSTED_ROOT    1

#define CHAIN_QUALITY_HIGHEST \
 CHAIN_QUALITY_SIGNATURE_VALID | CHAIN_QUALITY_TIME_VALID | \
 CHAIN_QUALITY_COMPLETE_CHAIN | CHAIN_QUALITY_TRUSTED_ROOT

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

1348
static DWORD CRYPT_ChainQuality(const CertificateChain *chain)
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
{
    DWORD quality = CHAIN_QUALITY_HIGHEST;

    if (IS_TRUST_ERROR_SET(&chain->context.TrustStatus,
     CERT_TRUST_IS_UNTRUSTED_ROOT))
        quality &= ~CHAIN_QUALITY_TRUSTED_ROOT;
    if (IS_TRUST_ERROR_SET(&chain->context.TrustStatus,
     CERT_TRUST_IS_PARTIAL_CHAIN))
    if (chain->context.TrustStatus.dwErrorStatus & 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;
1396 1397
            chain->context.cLowerQualityChainContext = 0;
            chain->context.rgpLowerQualityChainContext = NULL;
1398 1399 1400 1401 1402 1403 1404
            chain = alternate;
        }
    }
    return chain;
}

static BOOL CRYPT_AddAlternateChainToChain(PCertificateChain chain,
1405
 const CertificateChain *alternate)
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
{
    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;
}

1429
static PCERT_CHAIN_ELEMENT CRYPT_FindIthElementInChain(
1430
 const CERT_CHAIN_CONTEXT *chain, DWORD i)
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
{
    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;
}

1445 1446 1447 1448 1449
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;

1450
static void CRYPT_VerifyChainRevocation(PCERT_CHAIN_CONTEXT chain,
1451
 LPFILETIME pTime, const CERT_CHAIN_PARA *pChainPara, DWORD chainFlags)
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
{
    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)
    {
        PCCERT_CONTEXT *contexts =
         CryptMemAlloc(cContext * sizeof(PCCERT_CONTEXT *));

        if (contexts)
        {
            DWORD i, j, iContext, revocationFlags;
            CERT_REVOCATION_PARA revocationPara = { sizeof(revocationPara), 0 };
            CERT_REVOCATION_STATUS revocationStatus =
             { sizeof(revocationStatus), 0 };
            BOOL ret;

            for (i = 0, iContext = 0; iContext < cContext && i < chain->cChain;
             i++)
            {
                for (j = 0; iContext < cContext &&
                 j < chain->rgpChain[i]->cElement; j++)
                    contexts[iContext++] =
                     chain->rgpChain[i]->rgpElement[j]->pCertContext;
            }
            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 (pChainPara->cbSize == sizeof(CERT_CHAIN_PARA))
            {
                revocationPara.dwUrlRetrievalTimeout =
                 pChainPara->dwUrlRetrievalTimeout;
                revocationPara.fCheckFreshnessTime =
                 pChainPara->fCheckRevocationFreshnessTime;
                revocationPara.dwFreshnessTime =
                 pChainPara->dwRevocationFreshnessTime;
            }
            ret = CertVerifyRevocation(X509_ASN_ENCODING,
             CERT_CONTEXT_REVOCATION_TYPE, cContext, (void **)contexts,
             revocationFlags, &revocationPara, &revocationStatus);
            if (!ret)
            {
                PCERT_CHAIN_ELEMENT element =
                 CRYPT_FindIthElementInChain(chain, revocationStatus.dwIndex);
                DWORD error;

                switch (revocationStatus.dwError)
                {
                case CRYPT_E_NO_REVOCATION_CHECK:
                case CRYPT_E_NO_REVOCATION_DLL:
                case CRYPT_E_NOT_IN_REVOCATION_DATABASE:
                    error = CERT_TRUST_REVOCATION_STATUS_UNKNOWN;
                    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;
            }
            CryptMemFree(contexts);
        }
    }
}
1546

1547 1548 1549 1550 1551
BOOL WINAPI CertGetCertificateChain(HCERTCHAINENGINE hChainEngine,
 PCCERT_CONTEXT pCertContext, LPFILETIME pTime, HCERTSTORE hAdditionalStore,
 PCERT_CHAIN_PARA pChainPara, DWORD dwFlags, LPVOID pvReserved,
 PCCERT_CHAIN_CONTEXT* ppChainContext)
{
1552
    BOOL ret;
1553
    PCertificateChain chain = NULL;
1554

1555 1556 1557
    TRACE("(%p, %p, %p, %p, %p, %08x, %p, %p)\n", hChainEngine, pCertContext,
     pTime, hAdditionalStore, pChainPara, dwFlags, pvReserved, ppChainContext);

1558 1559
    if (ppChainContext)
        *ppChainContext = NULL;
1560 1561 1562 1563 1564
    if (!pChainPara)
    {
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
1565 1566 1567 1568 1569
    if (!pCertContext->pCertInfo->SignatureAlgorithm.pszObjId)
    {
        SetLastError(ERROR_INVALID_DATA);
        return FALSE;
    }
1570 1571 1572 1573 1574 1575
    if (pChainPara->cbSize != sizeof(CERT_CHAIN_PARA_NO_EXTRA_FIELDS) &&
     pChainPara->cbSize != sizeof(CERT_CHAIN_PARA))
    {
        SetLastError(E_INVALIDARG);
        return FALSE;
    }
1576 1577 1578
    if (!hChainEngine)
        hChainEngine = CRYPT_GetDefaultChainEngine();
    /* FIXME: what about HCCE_LOCAL_MACHINE? */
1579 1580 1581
    ret = CRYPT_BuildCandidateChainFromCert(hChainEngine, pCertContext, pTime,
     hAdditionalStore, &chain);
    if (ret)
1582
    {
1583
        PCertificateChain alternate = NULL;
1584
        PCERT_CHAIN_CONTEXT pChain;
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599

        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);
1600 1601
        pChain = (PCERT_CHAIN_CONTEXT)chain;
        CRYPT_VerifyChainRevocation(pChain, pTime, pChainPara, dwFlags);
1602
        if (ppChainContext)
1603
            *ppChainContext = pChain;
1604
        else
1605
            CertFreeCertificateChain(pChain);
1606 1607 1608 1609 1610
    }
    TRACE("returning %d\n", ret);
    return ret;
}

1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622
PCCERT_CHAIN_CONTEXT WINAPI CertDuplicateCertificateChain(
 PCCERT_CHAIN_CONTEXT pChainContext)
{
    PCertificateChain chain = (PCertificateChain)pChainContext;

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

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

1623
VOID WINAPI CertFreeCertificateChain(PCCERT_CHAIN_CONTEXT pChainContext)
1624
{
1625 1626 1627 1628 1629 1630 1631 1632 1633
    PCertificateChain chain = (PCertificateChain)pChainContext;

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

    if (chain)
    {
        if (InterlockedDecrement(&chain->ref) == 0)
            CRYPT_FreeChainContext(chain);
    }
1634
}
1635

1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
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)
{
    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 &
     CERT_TRUST_IS_UNTRUSTED_ROOT)
    {
        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_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;
    }
1681 1682
    else
        pPolicyStatus->dwError = NO_ERROR;
1683 1684 1685
    return TRUE;
}

1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735
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 };

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);

    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;
}

1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
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);
    }
1749 1750
    else
        pPolicyStatus->dwError = NO_ERROR;
1751 1752 1753
    return TRUE;
}

1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 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
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;
}

1868 1869 1870 1871
typedef BOOL (WINAPI *CertVerifyCertificateChainPolicyFunc)(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus);

1872 1873 1874 1875
BOOL WINAPI CertVerifyCertificateChainPolicy(LPCSTR szPolicyOID,
 PCCERT_CHAIN_CONTEXT pChainContext, PCERT_CHAIN_POLICY_PARA pPolicyPara,
 PCERT_CHAIN_POLICY_STATUS pPolicyStatus)
{
1876 1877 1878 1879 1880 1881
    static HCRYPTOIDFUNCSET set = NULL;
    BOOL ret = FALSE;
    CertVerifyCertificateChainPolicyFunc verifyPolicy = NULL;
    HCRYPTOIDFUNCADDR hFunc = NULL;

    TRACE("(%s, %p, %p, %p)\n", debugstr_a(szPolicyOID), pChainContext,
1882
     pPolicyPara, pPolicyStatus);
1883 1884 1885 1886 1887

    if (!HIWORD(szPolicyOID))
    {
        switch (LOWORD(szPolicyOID))
        {
1888
        case LOWORD(CERT_CHAIN_POLICY_BASE):
1889 1890
            verifyPolicy = verify_base_policy;
            break;
1891
        case LOWORD(CERT_CHAIN_POLICY_AUTHENTICODE):
1892 1893
            verifyPolicy = verify_authenticode_policy;
            break;
1894
        case LOWORD(CERT_CHAIN_POLICY_BASIC_CONSTRAINTS):
1895 1896
            verifyPolicy = verify_basic_constraints_policy;
            break;
1897
        case LOWORD(CERT_CHAIN_POLICY_MICROSOFT_ROOT):
1898 1899
            verifyPolicy = verify_ms_root_policy;
            break;
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
        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,
1910
         (void **)&verifyPolicy, &hFunc);
1911 1912 1913 1914 1915 1916 1917
    }
    if (verifyPolicy)
        ret = verifyPolicy(szPolicyOID, pChainContext, pPolicyPara,
         pPolicyStatus);
    if (hFunc)
        CryptFreeOIDFunctionAddress(hFunc, 0);
    return ret;
1918
}