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crypt32: Reject certificates whose fields don't match their versions.

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Juan Lang 2009-11-06 14:38:40 -08:00 committed by Alexandre Julliard
parent 9fe6be454f
commit 216df7a714
1 changed files with 47 additions and 0 deletions
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47
dlls/crypt32/chain.c
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@ -1311,6 +1311,45 @@ static BOOL CRYPT_CriticalExtensionsSupported(PCCERT_CONTEXT cert)
return ret;
}
static BOOL CRYPT_IsCertVersionValid(PCCERT_CONTEXT cert)
{
BOOL ret = TRUE;
/* Checks whether the contents of the cert match the cert's version. */
switch (cert->pCertInfo->dwVersion)
{
case CERT_V1:
/* A V1 cert may not contain unique identifiers. See RFC 5280,
* section 4.1.2.8:
* "These fields MUST only appear if the version is 2 or 3 (Section
* 4.1.2.1). These fields MUST NOT appear if the version is 1."
*/
if (cert->pCertInfo->IssuerUniqueId.cbData ||
cert->pCertInfo->SubjectUniqueId.cbData)
ret = FALSE;
/* A V1 cert may not contain extensions. See RFC 5280, section 4.1.2.9:
* "This field MUST only appear if the version is 3 (Section 4.1.2.1)."
*/
if (cert->pCertInfo->cExtension)
ret = FALSE;
break;
case CERT_V2:
/* A V2 cert may not contain extensions. See RFC 5280, section 4.1.2.9:
* "This field MUST only appear if the version is 3 (Section 4.1.2.1)."
*/
if (cert->pCertInfo->cExtension)
ret = FALSE;
break;
case CERT_V3:
/* Do nothing, all fields are allowed for V3 certs */
break;
default:
WARN_(chain)("invalid cert version %d\n", cert->pCertInfo->dwVersion);
ret = FALSE;
}
return ret;
}
static void CRYPT_CheckSimpleChain(PCertificateChainEngine engine,
PCERT_SIMPLE_CHAIN chain, LPFILETIME time)
{
@ -1332,6 +1371,14 @@ static void CRYPT_CheckSimpleChain(PCertificateChainEngine engine,
chain->rgpElement[i]->pCertContext);
else
isRoot = FALSE;
if (!CRYPT_IsCertVersionValid(chain->rgpElement[i]->pCertContext))
{
/* MS appears to accept certs whose versions don't match their
* contents, so there isn't an appropriate error code.
*/
chain->rgpElement[i]->TrustStatus.dwErrorStatus |=
CERT_TRUST_INVALID_EXTENSION;
}
if (CertVerifyTimeValidity(time,
chain->rgpElement[i]->pCertContext->pCertInfo) != 0)
chain->rgpElement[i]->TrustStatus.dwErrorStatus |=