Sweden-Number/dlls/crypt32/chain.c

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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>
#include "windef.h"
#include "winbase.h"
#include "wincrypt.h"
#include "wine/debug.h"
#include "crypt32_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(crypt);
static HCERTCHAINENGINE CRYPT_defaultChainEngine;
/* 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 };
static BOOL CRYPT_CheckRestrictedRoot(HCERTSTORE store)
{
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;
}
BOOL WINAPI CertCreateCertificateChainEngine(PCERT_CHAIN_ENGINE_CONFIG pConfig,
HCERTCHAINENGINE *phChainEngine)
{
static const WCHAR caW[] = { 'C','A',0 };
static const WCHAR myW[] = { 'M','y',0 };
static const WCHAR trustW[] = { 'T','r','u','s','t',0 };
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)
{
PCertificateChainEngine engine =
CryptMemAlloc(sizeof(CertificateChainEngine));
if (engine)
{
HCERTSTORE worldStores[4];
engine->ref = 1;
if (pConfig->hRestrictedRoot)
engine->hRoot = CertDuplicateStore(pConfig->hRestrictedRoot);
else
engine->hRoot = CertOpenSystemStoreW(0, rootW);
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;
engine->CycleDetectionModulus = pConfig->CycleDetectionModulus;
*phChainEngine = (HCERTCHAINENGINE)engine;
ret = TRUE;
}
else
ret = FALSE;
}
return ret;
}
void WINAPI CertFreeCertificateChainEngine(HCERTCHAINENGINE hChainEngine)
{
PCertificateChainEngine engine = (PCertificateChainEngine)hChainEngine;
TRACE("(%p)\n", hChainEngine);
if (engine && InterlockedDecrement(&engine->ref) == 0)
{
CertCloseStore(engine->hWorld, 0);
CertCloseStore(engine->hRoot, 0);
CryptMemFree(engine);
}
}
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;
LONG ref;
} CertificateChain, *PCertificateChain;
static inline BOOL WINAPI CRYPT_IsCertificateSelfSigned(PCCERT_CONTEXT cert)
{
return CertCompareCertificateName(cert->dwCertEncodingType,
&cert->pCertInfo->Subject, &cert->pCertInfo->Issuer);
}
/* Gets cert's issuer from store, and returns the validity flags associated
* with it. Returns NULL if no issuer whose public key matches cert's
* signature could be found.
*/
static PCCERT_CONTEXT CRYPT_GetIssuerFromStore(HCERTSTORE store,
PCCERT_CONTEXT cert, PDWORD pdwFlags)
{
PCCERT_CONTEXT issuer = NULL;
/* There might be more than issuer with the same name, so keep looking until
* one produces the correct signature for this cert.
*/
do {
*pdwFlags = CERT_STORE_REVOCATION_FLAG | CERT_STORE_SIGNATURE_FLAG |
CERT_STORE_TIME_VALIDITY_FLAG;
issuer = CertGetIssuerCertificateFromStore(store, cert, issuer,
pdwFlags);
} while (issuer && (*pdwFlags & CERT_STORE_SIGNATURE_FLAG));
return issuer;
}
static BOOL CRYPT_AddCertToSimpleChain(PCERT_SIMPLE_CHAIN chain,
PCCERT_CONTEXT cert, DWORD dwFlags)
{
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)
{
memset(element, 0, sizeof(CERT_CHAIN_ELEMENT));
element->cbSize = sizeof(CERT_CHAIN_ELEMENT);
element->pCertContext = cert;
if (dwFlags & CERT_STORE_REVOCATION_FLAG &&
!(dwFlags & CERT_STORE_NO_CRL_FLAG))
element->TrustStatus.dwErrorStatus |= CERT_TRUST_IS_REVOKED;
if (dwFlags & CERT_STORE_SIGNATURE_FLAG)
element->TrustStatus.dwErrorStatus |=
CERT_TRUST_IS_NOT_SIGNATURE_VALID;
if (dwFlags & CERT_STORE_TIME_VALIDITY_FLAG)
element->TrustStatus.dwErrorStatus |=
CERT_TRUST_IS_NOT_TIME_VALID;
/* It appears, from every example certificate chain I've found,
* that this flag is always set:
*/
element->TrustStatus.dwInfoStatus = CERT_TRUST_HAS_PREFERRED_ISSUER;
if (chain->cElement)
{
PCERT_CHAIN_ELEMENT prevElement =
chain->rgpElement[chain->cElement - 1];
/* This cert is the issuer of the previous one in the chain, so
* retroactively check the previous one's time validity nesting.
*/
if (!CertVerifyValidityNesting(
prevElement->pCertContext->pCertInfo, cert->pCertInfo))
prevElement->TrustStatus.dwErrorStatus |=
CERT_TRUST_IS_NOT_TIME_NESTED;
}
/* FIXME: check valid usages, name constraints, and for cycles */
/* FIXME: initialize the rest of element */
chain->TrustStatus.dwErrorStatus |=
element->TrustStatus.dwErrorStatus;
chain->TrustStatus.dwInfoStatus |=
element->TrustStatus.dwInfoStatus;
chain->rgpElement[chain->cElement++] = element;
ret = TRUE;
}
else
CryptMemFree(element);
}
return ret;
}
static void CRYPT_FreeSimpleChain(PCERT_SIMPLE_CHAIN chain)
{
DWORD i;
for (i = 0; i < chain->cElement; i++)
CryptMemFree(chain->rgpElement[i]);
CryptMemFree(chain->rgpElement);
CryptMemFree(chain);
}
static BOOL CRYPT_BuildSimpleChain(HCERTCHAINENGINE hChainEngine,
PCCERT_CONTEXT cert, LPFILETIME pTime, HCERTSTORE hAdditionalStore,
PCERT_SIMPLE_CHAIN *ppChain)
{
BOOL ret = FALSE;
PCertificateChainEngine engine = (PCertificateChainEngine)hChainEngine;
PCERT_SIMPLE_CHAIN chain;
HCERTSTORE world;
TRACE("(%p, %p, %p, %p)\n", hChainEngine, cert, pTime, hAdditionalStore);
world = CertOpenStore(CERT_STORE_PROV_COLLECTION, 0, 0,
CERT_STORE_CREATE_NEW_FLAG, NULL);
CertAddStoreToCollection(world, engine->hWorld, 0, 0);
if (cert->hCertStore)
CertAddStoreToCollection(world, cert->hCertStore, 0, 0);
if (hAdditionalStore)
CertAddStoreToCollection(world, hAdditionalStore, 0, 0);
chain = CryptMemAlloc(sizeof(CERT_SIMPLE_CHAIN));
if (chain)
{
memset(chain, 0, sizeof(CERT_SIMPLE_CHAIN));
chain->cbSize = sizeof(CERT_SIMPLE_CHAIN);
ret = CRYPT_AddCertToSimpleChain(chain, cert, 0);
while (ret && !CRYPT_IsCertificateSelfSigned(cert))
{
DWORD flags;
PCCERT_CONTEXT issuer = CRYPT_GetIssuerFromStore(world, cert,
&flags);
if (issuer)
{
ret = CRYPT_AddCertToSimpleChain(chain, issuer, flags);
cert = issuer;
}
else
{
TRACE("Couldn't find issuer, aborting chain creation\n");
ret = FALSE;
}
}
if (ret)
{
PCCERT_CONTEXT root = chain->rgpElement[chain->cElement - 1]->
pCertContext;
if (!(ret = CRYPT_IsCertificateSelfSigned(root)))
TRACE("Last certificate is not self-signed\n");
else
{
chain->rgpElement[chain->cElement - 1]->TrustStatus.dwInfoStatus
|= CERT_TRUST_IS_SELF_SIGNED;
if (!(ret = CryptVerifyCertificateSignatureEx(0,
root->dwCertEncodingType, CRYPT_VERIFY_CERT_SIGN_SUBJECT_CERT,
(void *)root, CRYPT_VERIFY_CERT_SIGN_ISSUER_CERT, (void *)root,
0, NULL)))
TRACE("Last certificate's signature is invalid\n");
}
if (ret)
{
BYTE hash[20];
DWORD size = sizeof(hash);
CRYPT_HASH_BLOB blob = { sizeof(hash), hash };
PCCERT_CONTEXT trustedRoot;
CertGetCertificateContextProperty(root, CERT_HASH_PROP_ID, hash,
&size);
trustedRoot = CertFindCertificateInStore(engine->hRoot,
root->dwCertEncodingType, 0, CERT_FIND_SHA1_HASH, &blob, NULL);
if (!trustedRoot)
chain->TrustStatus.dwErrorStatus |=
CERT_TRUST_IS_UNTRUSTED_ROOT;
else
CertFreeCertificateContext(trustedRoot);
}
}
if (!ret)
{
CRYPT_FreeSimpleChain(chain);
chain = NULL;
}
*ppChain = chain;
}
CertCloseStore(world, 0);
return ret;
}
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;
typedef struct _CERT_CHAIN_PARA_EXTRA_FIELDS {
DWORD cbSize;
CERT_USAGE_MATCH RequestedUsage;
CERT_USAGE_MATCH RequestedIssuancePolicy;
DWORD dwUrlRetrievalTimeout;
BOOL fCheckRevocationFreshnessTime;
DWORD dwRevocationFreshnessTime;
} CERT_CHAIN_PARA_EXTRA_FIELDS, *PCERT_CHAIN_PARA_EXTRA_FIELDS;
BOOL WINAPI CertGetCertificateChain(HCERTCHAINENGINE hChainEngine,
PCCERT_CONTEXT pCertContext, LPFILETIME pTime, HCERTSTORE hAdditionalStore,
PCERT_CHAIN_PARA pChainPara, DWORD dwFlags, LPVOID pvReserved,
PCCERT_CHAIN_CONTEXT* ppChainContext)
{
PCERT_SIMPLE_CHAIN simpleChain = NULL;
BOOL ret;
TRACE("(%p, %p, %p, %p, %p, %08x, %p, %p)\n", hChainEngine, pCertContext,
pTime, hAdditionalStore, pChainPara, dwFlags, pvReserved, ppChainContext);
if (!pChainPara)
{
SetLastError(E_INVALIDARG);
return FALSE;
}
2007-08-14 23:35:31 +02:00
if (ppChainContext)
*ppChainContext = NULL;
if (!hChainEngine)
hChainEngine = CRYPT_GetDefaultChainEngine();
/* FIXME: what about HCCE_LOCAL_MACHINE? */
/* FIXME: pChainPara is for now ignored */
/* FIXME: only simple chains are supported for now, as CTLs aren't
* supported yet.
*/
if ((ret = CRYPT_BuildSimpleChain(hChainEngine, pCertContext, pTime,
hAdditionalStore, &simpleChain)))
{
PCertificateChain chain = CryptMemAlloc(sizeof(CertificateChain));
if (chain)
{
chain->ref = 1;
chain->context.cbSize = sizeof(CERT_CHAIN_CONTEXT);
memcpy(&chain->context.TrustStatus, &simpleChain->TrustStatus,
sizeof(CERT_TRUST_STATUS));
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;
if (ppChainContext)
*ppChainContext = (PCCERT_CHAIN_CONTEXT)chain;
else
CertFreeCertificateChain((PCCERT_CHAIN_CONTEXT)chain);
}
TRACE("returning %d\n", ret);
return ret;
}
static void CRYPT_FreeChainContext(PCertificateChain chain)
{
DWORD i;
/* Note the chain's rgpLowerQualityChainContext isn't freed, but
* it's never set, either.
*/
for (i = 0; i < chain->context.cChain; i++)
CRYPT_FreeSimpleChain(chain->context.rgpChain[i]);
CryptMemFree(chain->context.rgpChain);
CryptMemFree(chain);
}
void WINAPI CertFreeCertificateChain(PCCERT_CHAIN_CONTEXT pChainContext)
{
PCertificateChain chain = (PCertificateChain)pChainContext;
TRACE("(%p)\n", pChainContext);
if (chain)
{
if (InterlockedDecrement(&chain->ref) == 0)
CRYPT_FreeChainContext(chain);
}
}