nsresult
VerifyCMSDetachedSignatureIncludingCertificate(
const SECItem& buffer, const SECItem& detachedDigest,
nsresult (*verifyCertificate)(CERTCertificate* cert, void* context,
void* pinArg),
void *verifyCertificateContext, void* pinArg)
{
// XXX: missing pinArg is tolerated.
if (NS_WARN_IF(!buffer.data && buffer.len > 0) ||
NS_WARN_IF(!detachedDigest.data && detachedDigest.len > 0) ||
(!verifyCertificate) ||
NS_WARN_IF(!verifyCertificateContext)) {
return NS_ERROR_INVALID_ARG;
}
ScopedNSSCMSMessage
cmsMsg(NSS_CMSMessage_CreateFromDER(const_cast<SECItem*>(&buffer), nullptr,
nullptr, nullptr, nullptr, nullptr,
nullptr));
if (!cmsMsg) {
return NS_ERROR_CMS_VERIFY_ERROR_PROCESSING;
}
if (!NSS_CMSMessage_IsSigned(cmsMsg.get())) {
return NS_ERROR_CMS_VERIFY_NOT_SIGNED;
}
NSSCMSContentInfo* cinfo = NSS_CMSMessage_ContentLevel(cmsMsg.get(), 0);
if (!cinfo) {
return NS_ERROR_CMS_VERIFY_NO_CONTENT_INFO;
}
// signedData is non-owning
NSSCMSSignedData* signedData =
reinterpret_cast<NSSCMSSignedData*>(NSS_CMSContentInfo_GetContent(cinfo));
if (!signedData) {
return NS_ERROR_CMS_VERIFY_NO_CONTENT_INFO;
}
// Set digest value.
if (NSS_CMSSignedData_SetDigestValue(signedData, SEC_OID_SHA1,
const_cast<SECItem*>(&detachedDigest))) {
return NS_ERROR_CMS_VERIFY_BAD_DIGEST;
}
// Parse the certificates into CERTCertificate objects held in memory so
// verifyCertificate will be able to find them during path building.
ScopedCERTCertList certs(CERT_NewCertList());
if (!certs) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (signedData->rawCerts) {
for (size_t i = 0; signedData->rawCerts[i]; ++i) {
ScopedCERTCertificate
cert(CERT_NewTempCertificate(CERT_GetDefaultCertDB(),
signedData->rawCerts[i], nullptr, false,
true));
// Skip certificates that fail to parse
if (cert) {
if (CERT_AddCertToListTail(certs.get(), cert.get()) == SECSuccess) {
cert.forget(); // ownership transfered
} else {
return NS_ERROR_OUT_OF_MEMORY;
}
}
}
}
// Get the end-entity certificate.
int numSigners = NSS_CMSSignedData_SignerInfoCount(signedData);
if (NS_WARN_IF(numSigners != 1)) {
return NS_ERROR_CMS_VERIFY_ERROR_PROCESSING;
}
// signer is non-owning.
NSSCMSSignerInfo* signer = NSS_CMSSignedData_GetSignerInfo(signedData, 0);
if (NS_WARN_IF(!signer)) {
return NS_ERROR_CMS_VERIFY_ERROR_PROCESSING;
}
CERTCertificate* signerCert =
NSS_CMSSignerInfo_GetSigningCertificate(signer, CERT_GetDefaultCertDB());
if (!signerCert) {
return NS_ERROR_CMS_VERIFY_ERROR_PROCESSING;
}
nsresult rv = verifyCertificate(signerCert, verifyCertificateContext, pinArg);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// See NSS_CMSContentInfo_GetContentTypeOID, which isn't exported from NSS.
SECOidData* contentTypeOidData =
SECOID_FindOID(&signedData->contentInfo.contentType);
if (!contentTypeOidData) {
return NS_ERROR_CMS_VERIFY_ERROR_PROCESSING;
}
return MapSECStatus(NSS_CMSSignerInfo_Verify(signer,
const_cast<SECItem*>(&detachedDigest),
&contentTypeOidData->oid));
}
nsresult nsCMSMessage::CommonVerifySignature(unsigned char* aDigestData, PRUint32 aDigestDataLen)
{
nsNSSShutDownPreventionLock locker;
if (isAlreadyShutDown())
return NS_ERROR_NOT_AVAILABLE;
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature, content level count %d\n", NSS_CMSMessage_ContentLevelCount(m_cmsMsg)));
NSSCMSContentInfo *cinfo = nsnull;
NSSCMSSignedData *sigd = nsnull;
NSSCMSSignerInfo *si;
PRInt32 nsigners;
nsresult rv = NS_ERROR_FAILURE;
if (NSS_CMSMessage_IsSigned(m_cmsMsg) == PR_FALSE) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - not signed\n"));
return NS_ERROR_CMS_VERIFY_NOT_SIGNED;
}
cinfo = NSS_CMSMessage_ContentLevel(m_cmsMsg, 0);
if (cinfo) {
// I don't like this hard cast. We should check in some way, that we really have this type.
sigd = (NSSCMSSignedData*)NSS_CMSContentInfo_GetContent(cinfo);
}
if (!sigd) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - no content info\n"));
rv = NS_ERROR_CMS_VERIFY_NO_CONTENT_INFO;
goto loser;
}
if (aDigestData && aDigestDataLen)
{
SECItem digest;
digest.data = aDigestData;
digest.len = aDigestDataLen;
if (NSS_CMSSignedData_SetDigestValue(sigd, SEC_OID_SHA1, &digest)) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - bad digest\n"));
rv = NS_ERROR_CMS_VERIFY_BAD_DIGEST;
goto loser;
}
}
// Import certs. Note that import failure is not a signature verification failure. //
if (NSS_CMSSignedData_ImportCerts(sigd, CERT_GetDefaultCertDB(), certUsageEmailRecipient, PR_TRUE) != SECSuccess) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - can not import certs\n"));
}
nsigners = NSS_CMSSignedData_SignerInfoCount(sigd);
PR_ASSERT(nsigners > 0);
si = NSS_CMSSignedData_GetSignerInfo(sigd, 0);
// See bug 324474. We want to make sure the signing cert is
// still valid at the current time.
if (CERT_VerifyCertificateNow(CERT_GetDefaultCertDB(), si->cert, PR_TRUE,
certificateUsageEmailSigner,
si->cmsg->pwfn_arg, NULL) != SECSuccess) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - signing cert not trusted now\n"));
rv = NS_ERROR_CMS_VERIFY_UNTRUSTED;
goto loser;
}
// We verify the first signer info, only //
if (NSS_CMSSignedData_VerifySignerInfo(sigd, 0, CERT_GetDefaultCertDB(), certUsageEmailSigner) != SECSuccess) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - unable to verify signature\n"));
if (NSSCMSVS_SigningCertNotFound == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - signing cert not found\n"));
rv = NS_ERROR_CMS_VERIFY_NOCERT;
}
else if(NSSCMSVS_SigningCertNotTrusted == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - signing cert not trusted at signing time\n"));
rv = NS_ERROR_CMS_VERIFY_UNTRUSTED;
}
else if(NSSCMSVS_Unverified == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - can not verify\n"));
rv = NS_ERROR_CMS_VERIFY_ERROR_UNVERIFIED;
}
else if(NSSCMSVS_ProcessingError == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - processing error\n"));
rv = NS_ERROR_CMS_VERIFY_ERROR_PROCESSING;
}
else if(NSSCMSVS_BadSignature == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - bad signature\n"));
rv = NS_ERROR_CMS_VERIFY_BAD_SIGNATURE;
}
else if(NSSCMSVS_DigestMismatch == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - digest mismatch\n"));
rv = NS_ERROR_CMS_VERIFY_DIGEST_MISMATCH;
}
else if(NSSCMSVS_SignatureAlgorithmUnknown == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - algo unknown\n"));
rv = NS_ERROR_CMS_VERIFY_UNKNOWN_ALGO;
}
else if(NSSCMSVS_SignatureAlgorithmUnsupported == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - algo not supported\n"));
rv = NS_ERROR_CMS_VERIFY_UNSUPPORTED_ALGO;
}
else if(NSSCMSVS_MalformedSignature == si->verificationStatus) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - malformed signature\n"));
rv = NS_ERROR_CMS_VERIFY_MALFORMED_SIGNATURE;
}
goto loser;
}
// Save the profile. Note that save import failure is not a signature verification failure. //
if (NSS_SMIMESignerInfo_SaveSMIMEProfile(si) != SECSuccess) {
PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - unable to save smime profile\n"));
}
rv = NS_OK;
loser:
return rv;
}