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crypt32: Check authority key identifer extension to determine if a certificate is self-signed.

This commit is contained in:
Juan Lang 2009-12-17 08:52:19 -08:00 committed by Alexandre Julliard
parent 34e82e3dbd
commit 048594854a
1 changed files with 111 additions and 3 deletions
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114
dlls/crypt32/chain.c
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@ -230,10 +230,118 @@ typedef struct _CertificateChain
LONG ref; LONG ref;
} CertificateChain, *PCertificateChain; } CertificateChain, *PCertificateChain;
static inline BOOL CRYPT_IsCertificateSelfSigned(PCCERT_CONTEXT cert) static BOOL CRYPT_IsCertificateSelfSigned(PCCERT_CONTEXT cert)
{ {
return CertCompareCertificateName(cert->dwCertEncodingType, PCERT_EXTENSION ext;
&cert->pCertInfo->Subject, &cert->pCertInfo->Issuer); DWORD size;
BOOL ret;
if ((ext = CertFindExtension(szOID_AUTHORITY_KEY_IDENTIFIER2,
cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
{
CERT_AUTHORITY_KEY_ID2_INFO *info;
ret = CryptDecodeObjectEx(cert->dwCertEncodingType,
X509_AUTHORITY_KEY_ID2, ext->Value.pbData, ext->Value.cbData,
CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
&info, &size);
if (ret)
{
if (info->AuthorityCertIssuer.cAltEntry &&
info->AuthorityCertSerialNumber.cbData)
{
PCERT_ALT_NAME_ENTRY directoryName = NULL;
DWORD i;
for (i = 0; !directoryName &&
i < info->AuthorityCertIssuer.cAltEntry; i++)
if (info->AuthorityCertIssuer.rgAltEntry[i].dwAltNameChoice
== CERT_ALT_NAME_DIRECTORY_NAME)
directoryName =
&info->AuthorityCertIssuer.rgAltEntry[i];
if (directoryName)
{
ret = CertCompareCertificateName(cert->dwCertEncodingType,
&directoryName->u.DirectoryName, &cert->pCertInfo->Issuer)
&& CertCompareIntegerBlob(&info->AuthorityCertSerialNumber,
&cert->pCertInfo->SerialNumber);
}
else
{
FIXME("no supported name type in authority key id2\n");
ret = FALSE;
}
}
else if (info->KeyId.cbData)
{
ret = CertGetCertificateContextProperty(cert,
CERT_KEY_IDENTIFIER_PROP_ID, NULL, &size);
if (ret && size == info->KeyId.cbData)
{
LPBYTE buf = CryptMemAlloc(size);
if (buf)
{
CertGetCertificateContextProperty(cert,
CERT_KEY_IDENTIFIER_PROP_ID, buf, &size);
ret = !memcmp(buf, info->KeyId.pbData, size);
CryptMemFree(buf);
}
}
else
ret = FALSE;
}
LocalFree(info);
}
}
else if ((ext = CertFindExtension(szOID_AUTHORITY_KEY_IDENTIFIER,
cert->pCertInfo->cExtension, cert->pCertInfo->rgExtension)))
{
CERT_AUTHORITY_KEY_ID_INFO *info;
ret = CryptDecodeObjectEx(cert->dwCertEncodingType,
X509_AUTHORITY_KEY_ID, ext->Value.pbData, ext->Value.cbData,
CRYPT_DECODE_ALLOC_FLAG | CRYPT_DECODE_NOCOPY_FLAG, NULL,
&info, &size);
if (ret)
{
if (info->CertIssuer.cbData && info->CertSerialNumber.cbData)
{
ret = CertCompareCertificateName(cert->dwCertEncodingType,
&info->CertIssuer, &cert->pCertInfo->Issuer) &&
CertCompareIntegerBlob(&info->CertSerialNumber,
&cert->pCertInfo->SerialNumber);
}
else if (info->KeyId.cbData)
{
ret = CertGetCertificateContextProperty(cert,
CERT_KEY_IDENTIFIER_PROP_ID, NULL, &size);
if (ret && size == info->KeyId.cbData)
{
LPBYTE buf = CryptMemAlloc(size);
if (buf)
{
CertGetCertificateContextProperty(cert,
CERT_KEY_IDENTIFIER_PROP_ID, buf, &size);
ret = !memcmp(buf, info->KeyId.pbData, size);
CryptMemFree(buf);
}
else
ret = FALSE;
}
else
ret = FALSE;
}
else
ret = FALSE;
LocalFree(info);
}
}
else
ret = CertCompareCertificateName(cert->dwCertEncodingType,
&cert->pCertInfo->Subject, &cert->pCertInfo->Issuer);
return ret;
} }
static void CRYPT_FreeChainElement(PCERT_CHAIN_ELEMENT element) static void CRYPT_FreeChainElement(PCERT_CHAIN_ELEMENT element)