/*
* NSS_CMSSignerInfo_Verify - verify the signature of a single SignerInfo
*
* Just verifies the signature. The assumption is that verification of
* the certificate is done already.
*/
SECStatus
NSS_CMSSignerInfo_Verify(NSSCMSSignerInfo *signerinfo,
SECItem *digest, /* may be NULL */
SECItem *contentType) /* may be NULL */
{
SECKEYPublicKey *publickey = NULL;
NSSCMSAttribute *attr;
SECItem encoded_attrs;
CERTCertificate *cert;
NSSCMSVerificationStatus vs = NSSCMSVS_Unverified;
PLArenaPool *poolp;
SECOidTag digestalgtag;
SECOidTag pubkAlgTag;
if (signerinfo == NULL)
return SECFailure;
/* NSS_CMSSignerInfo_GetSigningCertificate will fail if 2nd parm is NULL
** and cert has not been verified
*/
cert = NSS_CMSSignerInfo_GetSigningCertificate(signerinfo, NULL);
if (cert == NULL) {
vs = NSSCMSVS_SigningCertNotFound;
goto loser;
}
if ((publickey = CERT_ExtractPublicKey(cert)) == NULL) {
vs = NSSCMSVS_ProcessingError;
goto loser;
}
digestalgtag = NSS_CMSSignerInfo_GetDigestAlgTag(signerinfo);
pubkAlgTag = SECOID_GetAlgorithmTag(&(signerinfo->digestEncAlg));
if ((pubkAlgTag == SEC_OID_UNKNOWN) || (digestalgtag == SEC_OID_UNKNOWN)) {
vs = NSSCMSVS_SignatureAlgorithmUnknown;
goto loser;
}
if (!NSS_CMSArray_IsEmpty((void **)signerinfo->authAttr)) {
if (contentType) {
/*
* Check content type
*
* RFC2630 sez that if there are any authenticated attributes,
* then there must be one for content type which matches the
* content type of the content being signed, and there must
* be one for message digest which matches our message digest.
* So check these things first.
*/
attr = NSS_CMSAttributeArray_FindAttrByOidTag(signerinfo->authAttr,
SEC_OID_PKCS9_CONTENT_TYPE, PR_TRUE);
if (attr == NULL) {
vs = NSSCMSVS_MalformedSignature;
goto loser;
}
if (NSS_CMSAttribute_CompareValue(attr, contentType) == PR_FALSE) {
vs = NSSCMSVS_MalformedSignature;
goto loser;
}
}
/*
* Check digest
*/
attr = NSS_CMSAttributeArray_FindAttrByOidTag(signerinfo->authAttr,
SEC_OID_PKCS9_MESSAGE_DIGEST, PR_TRUE);
if (attr == NULL) {
vs = NSSCMSVS_MalformedSignature;
goto loser;
}
if (!digest ||
NSS_CMSAttribute_CompareValue(attr, digest) == PR_FALSE) {
vs = NSSCMSVS_DigestMismatch;
goto loser;
}
if ((poolp = PORT_NewArena (1024)) == NULL) {
vs = NSSCMSVS_ProcessingError;
goto loser;
}
/*
* Check signature
*
* The signature is based on a digest of the DER-encoded authenticated
* attributes. So, first we encode and then we digest/verify.
* we trust the decoder to have the attributes in the right (sorted)
* order
*/
encoded_attrs.data = NULL;
encoded_attrs.len = 0;
if (NSS_CMSAttributeArray_Encode(poolp, &(signerinfo->authAttr),
&encoded_attrs) == NULL ||
encoded_attrs.data == NULL || encoded_attrs.len == 0) {
PORT_FreeArena(poolp, PR_FALSE);
vs = NSSCMSVS_ProcessingError;
goto loser;
}
vs = (VFY_VerifyDataDirect(encoded_attrs.data, encoded_attrs.len,
publickey, &(signerinfo->encDigest), pubkAlgTag,
digestalgtag, NULL, signerinfo->cmsg->pwfn_arg) != SECSuccess)
? NSSCMSVS_BadSignature : NSSCMSVS_GoodSignature;
PORT_FreeArena(poolp, PR_FALSE); /* awkward memory management :-( */
} else {
SECItem *sig;
/* No authenticated attributes.
** The signature is based on the plain message digest.
*/
sig = &(signerinfo->encDigest);
if (sig->len == 0)
goto loser;
vs = (!digest ||
VFY_VerifyDigestDirect(digest, publickey, sig, pubkAlgTag,
digestalgtag, signerinfo->cmsg->pwfn_arg) != SECSuccess)
? NSSCMSVS_BadSignature : NSSCMSVS_GoodSignature;
}
if (vs == NSSCMSVS_BadSignature) {
int error = PORT_GetError();
/*
* XXX Change the generic error into our specific one, because
* in that case we get a better explanation out of the Security
* Advisor. This is really a bug in the PSM error strings (the
* "generic" error has a lousy/wrong message associated with it
* which assumes the signature verification was done for the
* purposes of checking the issuer signature on a certificate)
* but this is at least an easy workaround and/or in the
* Security Advisor, which specifically checks for the error
* SEC_ERROR_PKCS7_BAD_SIGNATURE and gives more explanation
* in that case but does not similarly check for
* SEC_ERROR_BAD_SIGNATURE. It probably should, but then would
* probably say the wrong thing in the case that it *was* the
* certificate signature check that failed during the cert
* verification done above. Our error handling is really a mess.
*/
if (error == SEC_ERROR_BAD_SIGNATURE)
PORT_SetError(SEC_ERROR_PKCS7_BAD_SIGNATURE);
/*
* map algorithm failures to NSSCMSVS values
*/
if ((error == SEC_ERROR_PKCS7_KEYALG_MISMATCH) ||
(error == SEC_ERROR_INVALID_ALGORITHM)) {
/* keep the same error code as 3.11 and before */
PORT_SetError(SEC_ERROR_PKCS7_BAD_SIGNATURE);
vs = NSSCMSVS_SignatureAlgorithmUnsupported;
}
}
if (publickey != NULL)
SECKEY_DestroyPublicKey (publickey);
signerinfo->verificationStatus = vs;
return (vs == NSSCMSVS_GoodSignature) ? SECSuccess : SECFailure;
loser:
if (publickey != NULL)
SECKEY_DestroyPublicKey (publickey);
signerinfo->verificationStatus = vs;
PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
return SECFailure;
}
SECStatus
VerifySignedData(const SignedDataWithSignature& sd,
const SECItem& subjectPublicKeyInfo, void* pkcs11PinArg)
{
if (!sd.data.data || !sd.signature.data) {
PR_NOT_REACHED("invalid args to VerifySignedData");
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
// See bug 921585.
if (sd.data.len > static_cast<unsigned int>(std::numeric_limits<int>::max())) {
PR_SetError(SEC_ERROR_INVALID_ARGS, 0);
return SECFailure;
}
SECOidTag pubKeyAlg;
SECOidTag digestAlg;
switch (sd.algorithm) {
case SignatureAlgorithm::ecdsa_with_sha512:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA512;
break;
case SignatureAlgorithm::ecdsa_with_sha384:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA384;
break;
case SignatureAlgorithm::ecdsa_with_sha256:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::ecdsa_with_sha1:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA1;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha512:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA512;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha384:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA384;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha256:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha1:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA1;
break;
case SignatureAlgorithm::dsa_with_sha256:
pubKeyAlg = SEC_OID_ANSIX9_DSA_SIGNATURE;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::dsa_with_sha1:
pubKeyAlg = SEC_OID_ANSIX9_DSA_SIGNATURE;
digestAlg = SEC_OID_SHA1;
break;
default:
PR_NOT_REACHED("unknown signature algorithm");
PR_SetError(SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED, 0);
return SECFailure;
}
ScopedSECKeyPublicKey pubKey;
if (CheckPublicKeySize(subjectPublicKeyInfo, pubKey) != SECSuccess) {
return SECFailure;
}
// The static_cast is safe according to the check above that references
// bug 921585.
return VFY_VerifyDataDirect(sd.data.data, static_cast<int>(sd.data.len),
pubKey.get(), &sd.signature, pubKeyAlg,
digestAlg, nullptr, pkcs11PinArg);
}
Result
VerifySignedData(const SignedDataWithSignature& sd,
Input subjectPublicKeyInfo, void* pkcs11PinArg)
{
// See bug 921585.
if (sd.data.GetLength() >
static_cast<unsigned int>(std::numeric_limits<int>::max())) {
return Result::FATAL_ERROR_INVALID_ARGS;
}
SECOidTag pubKeyAlg;
SECOidTag digestAlg;
switch (sd.algorithm) {
case SignatureAlgorithm::ecdsa_with_sha512:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA512;
break;
case SignatureAlgorithm::ecdsa_with_sha384:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA384;
break;
case SignatureAlgorithm::ecdsa_with_sha256:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::ecdsa_with_sha1:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA1;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha512:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA512;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha384:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA384;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha256:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha1:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA1;
break;
case SignatureAlgorithm::dsa_with_sha256:
pubKeyAlg = SEC_OID_ANSIX9_DSA_SIGNATURE;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::dsa_with_sha1:
pubKeyAlg = SEC_OID_ANSIX9_DSA_SIGNATURE;
digestAlg = SEC_OID_SHA1;
break;
default:
PR_NOT_REACHED("unknown signature algorithm");
return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
}
Result rv;
ScopedSECKeyPublicKey pubKey;
rv = CheckPublicKeySize(subjectPublicKeyInfo, pubKey);
if (rv != Success) {
return rv;
}
// The static_cast is safe according to the check above that references
// bug 921585.
SECItem dataSECItem(UnsafeMapInputToSECItem(sd.data));
SECItem signatureSECItem(UnsafeMapInputToSECItem(sd.signature));
SECStatus srv = VFY_VerifyDataDirect(dataSECItem.data,
static_cast<int>(dataSECItem.len),
pubKey.get(), &signatureSECItem,
pubKeyAlg, digestAlg, nullptr,
pkcs11PinArg);
if (srv != SECSuccess) {
return MapPRErrorCodeToResult(PR_GetError());
}
return Success;
}
Result
VerifySignedData(const SignedDataWithSignature& sd,
Input subjectPublicKeyInfo, void* pkcs11PinArg)
{
SECOidTag pubKeyAlg;
SECOidTag digestAlg;
switch (sd.algorithm) {
case SignatureAlgorithm::ecdsa_with_sha512:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA512;
break;
case SignatureAlgorithm::ecdsa_with_sha384:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA384;
break;
case SignatureAlgorithm::ecdsa_with_sha256:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::ecdsa_with_sha1:
pubKeyAlg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
digestAlg = SEC_OID_SHA1;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha512:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA512;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha384:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA384;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha256:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::rsa_pkcs1_with_sha1:
pubKeyAlg = SEC_OID_PKCS1_RSA_ENCRYPTION;
digestAlg = SEC_OID_SHA1;
break;
case SignatureAlgorithm::dsa_with_sha256:
pubKeyAlg = SEC_OID_ANSIX9_DSA_SIGNATURE;
digestAlg = SEC_OID_SHA256;
break;
case SignatureAlgorithm::dsa_with_sha1:
pubKeyAlg = SEC_OID_ANSIX9_DSA_SIGNATURE;
digestAlg = SEC_OID_SHA1;
break;
default:
PR_NOT_REACHED("unknown signature algorithm");
return Result::ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED;
}
Result rv;
ScopedSECKeyPublicKey pubKey;
rv = CheckPublicKeySize(subjectPublicKeyInfo, pubKey);
if (rv != Success) {
return rv;
}
// The static_cast is safe as long as the length of the data in sd.data can
// fit in an int. Right now that length is stored as a uint16_t, so this
// works. In the future this may change, hence the assertion.
// See also bug 921585.
static_assert(sizeof(decltype(sd.data.GetLength())) < sizeof(int),
"sd.data.GetLength() must fit in an int");
SECItem dataSECItem(UnsafeMapInputToSECItem(sd.data));
SECItem signatureSECItem(UnsafeMapInputToSECItem(sd.signature));
SECStatus srv = VFY_VerifyDataDirect(dataSECItem.data,
static_cast<int>(dataSECItem.len),
pubKey.get(), &signatureSECItem,
pubKeyAlg, digestAlg, nullptr,
pkcs11PinArg);
if (srv != SECSuccess) {
return MapPRErrorCodeToResult(PR_GetError());
}
return Success;
}