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gecko-dev/security/nss/lib/smime/cmssiginfo.c

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* CMS signerInfo methods.
*/
#include "cmslocal.h"
#include "cert.h"
#include "keyhi.h"
#include "secasn1.h"
#include "secitem.h"
#include "secoid.h"
#include "pk11func.h"
#include "prtime.h"
#include "secerr.h"
#include "secder.h"
#include "cryptohi.h"
#include "smime.h"
/* =============================================================================
* SIGNERINFO
*/
NSSCMSSignerInfo *
nss_cmssignerinfo_create(NSSCMSMessage *cmsg, NSSCMSSignerIDSelector type,
CERTCertificate *cert, SECItem *subjKeyID, SECKEYPublicKey *pubKey,
SECKEYPrivateKey *signingKey, SECOidTag digestalgtag);
NSSCMSSignerInfo *
NSS_CMSSignerInfo_CreateWithSubjKeyID(NSSCMSMessage *cmsg, SECItem *subjKeyID,
SECKEYPublicKey *pubKey,
SECKEYPrivateKey *signingKey, SECOidTag digestalgtag)
{
return nss_cmssignerinfo_create(cmsg, NSSCMSSignerID_SubjectKeyID, NULL,
subjKeyID, pubKey, signingKey, digestalgtag);
}
NSSCMSSignerInfo *
NSS_CMSSignerInfo_Create(NSSCMSMessage *cmsg, CERTCertificate *cert, SECOidTag digestalgtag)
{
return nss_cmssignerinfo_create(cmsg, NSSCMSSignerID_IssuerSN, cert, NULL,
NULL, NULL, digestalgtag);
}
NSSCMSSignerInfo *
nss_cmssignerinfo_create(NSSCMSMessage *cmsg, NSSCMSSignerIDSelector type,
CERTCertificate *cert, SECItem *subjKeyID, SECKEYPublicKey *pubKey,
SECKEYPrivateKey *signingKey, SECOidTag digestalgtag)
{
void *mark;
NSSCMSSignerInfo *signerinfo;
int version;
PLArenaPool *poolp;
SECStatus rv;
poolp = cmsg->poolp;
mark = PORT_ArenaMark(poolp);
signerinfo = (NSSCMSSignerInfo *)PORT_ArenaZAlloc(poolp, sizeof(NSSCMSSignerInfo));
if (signerinfo == NULL) {
PORT_ArenaRelease(poolp, mark);
return NULL;
}
signerinfo->cmsg = cmsg;
switch (type) {
case NSSCMSSignerID_IssuerSN:
signerinfo->signerIdentifier.identifierType = NSSCMSSignerID_IssuerSN;
if ((signerinfo->cert = CERT_DupCertificate(cert)) == NULL)
goto loser;
if ((signerinfo->signerIdentifier.id.issuerAndSN = CERT_GetCertIssuerAndSN(poolp, cert)) == NULL)
goto loser;
break;
case NSSCMSSignerID_SubjectKeyID:
signerinfo->signerIdentifier.identifierType = NSSCMSSignerID_SubjectKeyID;
PORT_Assert(subjKeyID);
if (!subjKeyID)
goto loser;
signerinfo->signerIdentifier.id.subjectKeyID = PORT_ArenaNew(poolp, SECItem);
rv = SECITEM_CopyItem(poolp, signerinfo->signerIdentifier.id.subjectKeyID,
subjKeyID);
if (rv != SECSuccess) {
goto loser;
}
signerinfo->signingKey = SECKEY_CopyPrivateKey(signingKey);
if (!signerinfo->signingKey)
goto loser;
signerinfo->pubKey = SECKEY_CopyPublicKey(pubKey);
if (!signerinfo->pubKey)
goto loser;
break;
default:
goto loser;
}
/* set version right now */
version = NSS_CMS_SIGNER_INFO_VERSION_ISSUERSN;
/* RFC2630 5.3 "version is the syntax version number. If the .... " */
if (signerinfo->signerIdentifier.identifierType == NSSCMSSignerID_SubjectKeyID)
version = NSS_CMS_SIGNER_INFO_VERSION_SUBJKEY;
(void)SEC_ASN1EncodeInteger(poolp, &(signerinfo->version), (long)version);
if (SECOID_SetAlgorithmID(poolp, &signerinfo->digestAlg, digestalgtag, NULL) != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return signerinfo;
loser:
PORT_ArenaRelease(poolp, mark);
return NULL;
}
/*
* NSS_CMSSignerInfo_Destroy - destroy a SignerInfo data structure
*/
void
NSS_CMSSignerInfo_Destroy(NSSCMSSignerInfo *si)
{
if (si->cert != NULL)
CERT_DestroyCertificate(si->cert);
if (si->certList != NULL)
CERT_DestroyCertificateList(si->certList);
/* XXX storage ??? */
}
static SECOidTag
NSS_CMSSignerInfo_GetSignatureAlgorithmOidTag(KeyType keyType,
SECOidTag pubkAlgTag,
SECOidTag signAlgTag)
{
switch (keyType) {
case rsaKey:
return pubkAlgTag;
case rsaPssKey:
case dsaKey:
case ecKey:
return signAlgTag;
default:
return SEC_OID_UNKNOWN;
}
}
/*
* NSS_CMSSignerInfo_Sign - sign something
*
*/
SECStatus
NSS_CMSSignerInfo_Sign(NSSCMSSignerInfo *signerinfo, SECItem *digest,
SECItem *contentType)
{
CERTCertificate *cert;
SECKEYPrivateKey *privkey = NULL;
SECOidTag digestalgtag;
SECOidTag pubkAlgTag;
SECOidTag signAlgTag;
SECOidTag cmsSignAlgTag;
SECItem signature = { 0 };
SECStatus rv;
PLArenaPool *poolp, *tmppoolp = NULL;
SECAlgorithmID *algID, freeAlgID;
CERTSubjectPublicKeyInfo *spki;
PORT_Assert(digest != NULL);
poolp = signerinfo->cmsg->poolp;
switch (signerinfo->signerIdentifier.identifierType) {
case NSSCMSSignerID_IssuerSN:
cert = signerinfo->cert;
privkey = PK11_FindKeyByAnyCert(cert, signerinfo->cmsg->pwfn_arg);
if (privkey == NULL)
goto loser;
algID = &cert->subjectPublicKeyInfo.algorithm;
break;
case NSSCMSSignerID_SubjectKeyID:
privkey = signerinfo->signingKey;
signerinfo->signingKey = NULL;
spki = SECKEY_CreateSubjectPublicKeyInfo(signerinfo->pubKey);
SECKEY_DestroyPublicKey(signerinfo->pubKey);
signerinfo->pubKey = NULL;
SECOID_CopyAlgorithmID(NULL, &freeAlgID, &spki->algorithm);
SECKEY_DestroySubjectPublicKeyInfo(spki);
algID = &freeAlgID;
break;
default:
goto loser;
}
digestalgtag = NSS_CMSSignerInfo_GetDigestAlgTag(signerinfo);
/*
* XXX I think there should be a cert-level interface for this,
* so that I do not have to know about subjectPublicKeyInfo...
*/
pubkAlgTag = SECOID_GetAlgorithmTag(algID);
if (algID == &freeAlgID) {
SECOID_DestroyAlgorithmID(&freeAlgID, PR_FALSE);
}
signAlgTag = SEC_GetSignatureAlgorithmOidTag(SECKEY_GetPrivateKeyType(privkey),
digestalgtag);
if (signAlgTag == SEC_OID_UNKNOWN) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
goto loser;
}
cmsSignAlgTag = NSS_CMSSignerInfo_GetSignatureAlgorithmOidTag(
SECKEY_GetPrivateKeyType(privkey), pubkAlgTag, signAlgTag);
if (cmsSignAlgTag == SEC_OID_UNKNOWN) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
goto loser;
}
if (SECOID_SetAlgorithmID(poolp, &(signerinfo->digestEncAlg),
cmsSignAlgTag, NULL) != SECSuccess)
goto loser;
if (signerinfo->authAttr != NULL) {
SECItem encoded_attrs;
/* find and fill in the message digest attribute. */
rv = NSS_CMSAttributeArray_SetAttr(poolp, &(signerinfo->authAttr),
SEC_OID_PKCS9_MESSAGE_DIGEST, digest, PR_FALSE);
if (rv != SECSuccess)
goto loser;
if (contentType != NULL) {
/* if the caller wants us to, find and fill in the content type attribute. */
rv = NSS_CMSAttributeArray_SetAttr(poolp, &(signerinfo->authAttr),
SEC_OID_PKCS9_CONTENT_TYPE, contentType, PR_FALSE);
if (rv != SECSuccess)
goto loser;
}
if ((tmppoolp = PORT_NewArena(1024)) == NULL) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
goto loser;
}
/*
* Before encoding, reorder the attributes so that when they
* are encoded, they will be conforming DER, which is required
* to have a specific order and that is what must be used for
* the hash/signature. We do this here, rather than building
* it into EncodeAttributes, because we do not want to do
* such reordering on incoming messages (which also uses
* EncodeAttributes) or our old signatures (and other "broken"
* implementations) will not verify. So, we want to guarantee
* that we send out good DER encodings of attributes, but not
* to expect to receive them.
*/
if (NSS_CMSAttributeArray_Reorder(signerinfo->authAttr) != SECSuccess)
goto loser;
encoded_attrs.data = NULL;
encoded_attrs.len = 0;
if (NSS_CMSAttributeArray_Encode(tmppoolp, &(signerinfo->authAttr),
&encoded_attrs) == NULL)
goto loser;
rv = SEC_SignData(&signature, encoded_attrs.data, encoded_attrs.len,
privkey, signAlgTag);
PORT_FreeArena(tmppoolp, PR_FALSE); /* awkward memory management :-( */
tmppoolp = 0;
} else {
rv = SGN_Digest(privkey, digestalgtag, &signature, digest);
}
SECKEY_DestroyPrivateKey(privkey);
privkey = NULL;
if (rv != SECSuccess)
goto loser;
if (SECITEM_CopyItem(poolp, &(signerinfo->encDigest), &signature) != SECSuccess)
goto loser;
SECITEM_FreeItem(&signature, PR_FALSE);
return SECSuccess;
loser:
if (signature.len != 0)
SECITEM_FreeItem(&signature, PR_FALSE);
if (privkey)
SECKEY_DestroyPrivateKey(privkey);
if (tmppoolp)
PORT_FreeArena(tmppoolp, PR_FALSE);
return SECFailure;
}
SECStatus
NSS_CMSSignerInfo_VerifyCertificate(NSSCMSSignerInfo *signerinfo, CERTCertDBHandle *certdb,
SECCertUsage certusage)
{
CERTCertificate *cert;
PRTime stime;
if ((cert = NSS_CMSSignerInfo_GetSigningCertificate(signerinfo, certdb)) == NULL) {
signerinfo->verificationStatus = NSSCMSVS_SigningCertNotFound;
return SECFailure;
}
/*
* Get and convert the signing time; if available, it will be used
* both on the cert verification and for importing the sender
* email profile.
*/
if (NSS_CMSSignerInfo_GetSigningTime(signerinfo, &stime) != SECSuccess)
stime = PR_Now(); /* not found or conversion failed, so check against now */
/*
* XXX This uses the signing time, if available. Additionally, we
* might want to, if there is no signing time, get the message time
* from the mail header itself, and use that. That would require
* a change to our interface though, and for S/MIME callers to pass
* in a time (and for non-S/MIME callers to pass in nothing, or
* maybe make them pass in the current time, always?).
*/
if (CERT_VerifyCert(certdb, cert, PR_TRUE, certusage, stime,
signerinfo->cmsg->pwfn_arg, NULL) != SECSuccess) {
signerinfo->verificationStatus = NSSCMSVS_SigningCertNotTrusted;
return SECFailure;
}
return SECSuccess;
}
/*
* 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;
SECOidTag digestalgtagCmp;
SECOidTag sigAlgTag;
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(&(cert->subjectPublicKeyInfo.algorithm));
sigAlgTag = SECOID_GetAlgorithmTag(&(signerinfo->digestEncAlg));
if ((pubkAlgTag == SEC_OID_UNKNOWN) || (digestalgtag == SEC_OID_UNKNOWN) ||
(sigAlgTag == 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;
}
if (sigAlgTag == pubkAlgTag) {
/* This is to handle cases in which signatureAlgorithm field
* specifies the public key algorithm rather than a signature
* algorithm. */
vs = (VFY_VerifyDataDirect(encoded_attrs.data, encoded_attrs.len,
publickey, &(signerinfo->encDigest), pubkAlgTag,
digestalgtag, NULL, signerinfo->cmsg->pwfn_arg) != SECSuccess)
? NSSCMSVS_BadSignature
: NSSCMSVS_GoodSignature;
} else {
if (VFY_VerifyDataWithAlgorithmID(encoded_attrs.data,
encoded_attrs.len, publickey, &(signerinfo->encDigest),
&(signerinfo->digestEncAlg), &digestalgtagCmp,
signerinfo->cmsg->pwfn_arg) != SECSuccess) {
vs = NSSCMSVS_BadSignature;
} else if (digestalgtagCmp != digestalgtag) {
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
vs = NSSCMSVS_BadSignature;
} else {
vs = 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;
if (sigAlgTag == pubkAlgTag) {
/* This is to handle cases in which signatureAlgorithm field
* specifies the public key algorithm rather than a signature
* algorithm. */
vs = (!digest ||
VFY_VerifyDigestDirect(digest, publickey, sig, pubkAlgTag,
digestalgtag, signerinfo->cmsg->pwfn_arg) != SECSuccess)
? NSSCMSVS_BadSignature
: NSSCMSVS_GoodSignature;
} else {
vs = (!digest ||
VFY_VerifyDigestWithAlgorithmID(digest, publickey, sig,
&(signerinfo->digestEncAlg), 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;
}
NSSCMSVerificationStatus
NSS_CMSSignerInfo_GetVerificationStatus(NSSCMSSignerInfo *signerinfo)
{
return signerinfo->verificationStatus;
}
SECOidData *
NSS_CMSSignerInfo_GetDigestAlg(NSSCMSSignerInfo *signerinfo)
{
SECOidData *algdata;
SECOidTag algtag;
algdata = SECOID_FindOID(&(signerinfo->digestAlg.algorithm));
if (algdata == NULL) {
return algdata;
}
/* Windows may have given us a signer algorithm oid instead of a digest
* algorithm oid. This call will map to a signer oid to a digest one,
* otherwise it leaves the oid alone and let the chips fall as they may
* if it's not a digest oid.
*/
algtag = NSS_CMSUtil_MapSignAlgs(algdata->offset);
if (algtag != algdata->offset) {
/* if the tags don't match, then we must have received a signer
* algorithID. Now we need to get the oid data for the digest
* oid, which the rest of the code is expecting */
algdata = SECOID_FindOIDByTag(algtag);
}
return algdata;
}
SECOidTag
NSS_CMSSignerInfo_GetDigestAlgTag(NSSCMSSignerInfo *signerinfo)
{
SECOidData *algdata;
if (!signerinfo) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SEC_OID_UNKNOWN;
}
algdata = NSS_CMSSignerInfo_GetDigestAlg(signerinfo);
if (algdata != NULL)
return algdata->offset;
else
return SEC_OID_UNKNOWN;
}
CERTCertificateList *
NSS_CMSSignerInfo_GetCertList(NSSCMSSignerInfo *signerinfo)
{
return signerinfo->certList;
}
int
NSS_CMSSignerInfo_GetVersion(NSSCMSSignerInfo *signerinfo)
{
unsigned long version;
/* always take apart the SECItem */
if (SEC_ASN1DecodeInteger(&(signerinfo->version), &version) != SECSuccess)
return 0;
else
return (int)version;
}
/*
* NSS_CMSSignerInfo_GetSigningTime - return the signing time,
* in UTCTime or GeneralizedTime format,
* of a CMS signerInfo.
*
* sinfo - signerInfo data for this signer
*
* Returns a pointer to XXXX (what?)
* A return value of NULL is an error.
*/
SECStatus
NSS_CMSSignerInfo_GetSigningTime(NSSCMSSignerInfo *sinfo, PRTime *stime)
{
NSSCMSAttribute *attr;
SECItem *value;
if (sinfo == NULL)
return SECFailure;
if (sinfo->signingTime != 0) {
*stime = sinfo->signingTime; /* cached copy */
return SECSuccess;
}
attr = NSS_CMSAttributeArray_FindAttrByOidTag(sinfo->authAttr,
SEC_OID_PKCS9_SIGNING_TIME, PR_TRUE);
/* XXXX multi-valued attributes NIH */
if (attr == NULL || (value = NSS_CMSAttribute_GetValue(attr)) == NULL)
return SECFailure;
if (DER_DecodeTimeChoice(stime, value) != SECSuccess)
return SECFailure;
sinfo->signingTime = *stime; /* make cached copy */
return SECSuccess;
}
/*
* Return the signing cert of a CMS signerInfo.
*
* the certs in the enclosing SignedData must have been imported already
*/
CERTCertificate *
NSS_CMSSignerInfo_GetSigningCertificate(NSSCMSSignerInfo *signerinfo, CERTCertDBHandle *certdb)
{
CERTCertificate *cert;
NSSCMSSignerIdentifier *sid;
if (signerinfo->cert != NULL)
return signerinfo->cert;
/* no certdb, and cert hasn't been set yet? */
if (certdb == NULL)
return NULL;
/*
* This cert will also need to be freed, but since we save it
* in signerinfo for later, we do not want to destroy it when
* we leave this function -- we let the clean-up of the entire
* cinfo structure later do the destroy of this cert.
*/
sid = &signerinfo->signerIdentifier;
switch (sid->identifierType) {
case NSSCMSSignerID_IssuerSN:
cert = CERT_FindCertByIssuerAndSN(certdb, sid->id.issuerAndSN);
break;
case NSSCMSSignerID_SubjectKeyID:
cert = CERT_FindCertBySubjectKeyID(certdb, sid->id.subjectKeyID);
break;
default:
cert = NULL;
break;
}
/* cert can be NULL at that point */
signerinfo->cert = cert; /* earmark it */
return cert;
}
/*
* NSS_CMSSignerInfo_GetSignerCommonName - return the common name of the signer
*
* sinfo - signerInfo data for this signer
*
* Returns a pointer to allocated memory, which must be freed with PORT_Free.
* A return value of NULL is an error.
*/
char *
NSS_CMSSignerInfo_GetSignerCommonName(NSSCMSSignerInfo *sinfo)
{
CERTCertificate *signercert;
/* will fail if cert is not verified */
if ((signercert = NSS_CMSSignerInfo_GetSigningCertificate(sinfo, NULL)) == NULL)
return NULL;
return (CERT_GetCommonName(&signercert->subject));
}
/*
* NSS_CMSSignerInfo_GetSignerEmailAddress - return the common name of the signer
*
* sinfo - signerInfo data for this signer
*
* Returns a pointer to allocated memory, which must be freed.
* A return value of NULL is an error.
*/
char *
NSS_CMSSignerInfo_GetSignerEmailAddress(NSSCMSSignerInfo *sinfo)
{
CERTCertificate *signercert;
if ((signercert = NSS_CMSSignerInfo_GetSigningCertificate(sinfo, NULL)) == NULL)
return NULL;
if (!signercert->emailAddr || !signercert->emailAddr[0])
return NULL;
return (PORT_Strdup(signercert->emailAddr));
}
/*
* NSS_CMSSignerInfo_AddAuthAttr - add an attribute to the
* authenticated (i.e. signed) attributes of "signerinfo".
*/
SECStatus
NSS_CMSSignerInfo_AddAuthAttr(NSSCMSSignerInfo *signerinfo, NSSCMSAttribute *attr)
{
return NSS_CMSAttributeArray_AddAttr(signerinfo->cmsg->poolp, &(signerinfo->authAttr), attr);
}
/*
* NSS_CMSSignerInfo_AddUnauthAttr - add an attribute to the
* unauthenticated attributes of "signerinfo".
*/
SECStatus
NSS_CMSSignerInfo_AddUnauthAttr(NSSCMSSignerInfo *signerinfo, NSSCMSAttribute *attr)
{
return NSS_CMSAttributeArray_AddAttr(signerinfo->cmsg->poolp, &(signerinfo->unAuthAttr), attr);
}
/*
* NSS_CMSSignerInfo_AddSigningTime - add the signing time to the
* authenticated (i.e. signed) attributes of "signerinfo".
*
* This is expected to be included in outgoing signed
* messages for email (S/MIME) but is likely useful in other situations.
*
* This should only be added once; a second call will do nothing.
*
* XXX This will probably just shove the current time into "signerinfo"
* but it will not actually get signed until the entire item is
* processed for encoding. Is this (expected to be small) delay okay?
*/
SECStatus
NSS_CMSSignerInfo_AddSigningTime(NSSCMSSignerInfo *signerinfo, PRTime t)
{
NSSCMSAttribute *attr;
SECItem stime;
void *mark;
PLArenaPool *poolp;
poolp = signerinfo->cmsg->poolp;
mark = PORT_ArenaMark(poolp);
/* create new signing time attribute */
if (DER_EncodeTimeChoice(NULL, &stime, t) != SECSuccess)
goto loser;
if ((attr = NSS_CMSAttribute_Create(poolp, SEC_OID_PKCS9_SIGNING_TIME, &stime, PR_FALSE)) == NULL) {
SECITEM_FreeItem(&stime, PR_FALSE);
goto loser;
}
SECITEM_FreeItem(&stime, PR_FALSE);
if (NSS_CMSSignerInfo_AddAuthAttr(signerinfo, attr) != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return SECSuccess;
loser:
PORT_ArenaRelease(poolp, mark);
return SECFailure;
}
/*
* NSS_CMSSignerInfo_AddSMIMECaps - add a SMIMECapabilities attribute to the
* authenticated (i.e. signed) attributes of "signerinfo".
*
* This is expected to be included in outgoing signed
* messages for email (S/MIME).
*/
SECStatus
NSS_CMSSignerInfo_AddSMIMECaps(NSSCMSSignerInfo *signerinfo)
{
NSSCMSAttribute *attr;
SECItem *smimecaps = NULL;
void *mark;
PLArenaPool *poolp;
poolp = signerinfo->cmsg->poolp;
mark = PORT_ArenaMark(poolp);
smimecaps = SECITEM_AllocItem(poolp, NULL, 0);
if (smimecaps == NULL)
goto loser;
/* create new signing time attribute */
if (NSS_SMIMEUtil_CreateSMIMECapabilities(poolp, smimecaps) != SECSuccess)
goto loser;
if ((attr = NSS_CMSAttribute_Create(poolp, SEC_OID_PKCS9_SMIME_CAPABILITIES, smimecaps, PR_TRUE)) == NULL)
goto loser;
if (NSS_CMSSignerInfo_AddAuthAttr(signerinfo, attr) != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return SECSuccess;
loser:
PORT_ArenaRelease(poolp, mark);
return SECFailure;
}
/*
* NSS_CMSSignerInfo_AddSMIMEEncKeyPrefs - add a SMIMEEncryptionKeyPreferences attribute to the
* authenticated (i.e. signed) attributes of "signerinfo".
*
* This is expected to be included in outgoing signed messages for email (S/MIME).
*/
SECStatus
NSS_CMSSignerInfo_AddSMIMEEncKeyPrefs(NSSCMSSignerInfo *signerinfo, CERTCertificate *cert, CERTCertDBHandle *certdb)
{
NSSCMSAttribute *attr;
SECItem *smimeekp = NULL;
void *mark;
PLArenaPool *poolp;
/* verify this cert for encryption */
if (CERT_VerifyCert(certdb, cert, PR_TRUE, certUsageEmailRecipient, PR_Now(), signerinfo->cmsg->pwfn_arg, NULL) != SECSuccess) {
return SECFailure;
}
poolp = signerinfo->cmsg->poolp;
mark = PORT_ArenaMark(poolp);
smimeekp = SECITEM_AllocItem(poolp, NULL, 0);
if (smimeekp == NULL)
goto loser;
/* create new signing time attribute */
if (NSS_SMIMEUtil_CreateSMIMEEncKeyPrefs(poolp, smimeekp, cert) != SECSuccess)
goto loser;
if ((attr = NSS_CMSAttribute_Create(poolp, SEC_OID_SMIME_ENCRYPTION_KEY_PREFERENCE, smimeekp, PR_TRUE)) == NULL)
goto loser;
if (NSS_CMSSignerInfo_AddAuthAttr(signerinfo, attr) != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return SECSuccess;
loser:
PORT_ArenaRelease(poolp, mark);
return SECFailure;
}
/*
* NSS_CMSSignerInfo_AddMSSMIMEEncKeyPrefs - add a SMIMEEncryptionKeyPreferences attribute to the
* authenticated (i.e. signed) attributes of "signerinfo", using the OID preferred by Microsoft.
*
* This is expected to be included in outgoing signed messages for email (S/MIME),
* if compatibility with Microsoft mail clients is wanted.
*/
SECStatus
NSS_CMSSignerInfo_AddMSSMIMEEncKeyPrefs(NSSCMSSignerInfo *signerinfo, CERTCertificate *cert, CERTCertDBHandle *certdb)
{
NSSCMSAttribute *attr;
SECItem *smimeekp = NULL;
void *mark;
PLArenaPool *poolp;
/* verify this cert for encryption */
if (CERT_VerifyCert(certdb, cert, PR_TRUE, certUsageEmailRecipient, PR_Now(), signerinfo->cmsg->pwfn_arg, NULL) != SECSuccess) {
return SECFailure;
}
poolp = signerinfo->cmsg->poolp;
mark = PORT_ArenaMark(poolp);
smimeekp = SECITEM_AllocItem(poolp, NULL, 0);
if (smimeekp == NULL)
goto loser;
/* create new signing time attribute */
if (NSS_SMIMEUtil_CreateMSSMIMEEncKeyPrefs(poolp, smimeekp, cert) != SECSuccess)
goto loser;
if ((attr = NSS_CMSAttribute_Create(poolp, SEC_OID_MS_SMIME_ENCRYPTION_KEY_PREFERENCE, smimeekp, PR_TRUE)) == NULL)
goto loser;
if (NSS_CMSSignerInfo_AddAuthAttr(signerinfo, attr) != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return SECSuccess;
loser:
PORT_ArenaRelease(poolp, mark);
return SECFailure;
}
/*
* NSS_CMSSignerInfo_AddCounterSignature - countersign a signerinfo
*
* 1. digest the DER-encoded signature value of the original signerinfo
* 2. create new signerinfo with correct version, sid, digestAlg
* 3. add message-digest authAttr, but NO content-type
* 4. sign the authAttrs
* 5. DER-encode the new signerInfo
* 6. add the whole thing to original signerInfo's unAuthAttrs
* as a SEC_OID_PKCS9_COUNTER_SIGNATURE attribute
*
* XXXX give back the new signerinfo?
*/
SECStatus
NSS_CMSSignerInfo_AddCounterSignature(NSSCMSSignerInfo *signerinfo,
SECOidTag digestalg, CERTCertificate signingcert)
{
/* XXXX TBD XXXX */
return SECFailure;
}
/*
* XXXX the following needs to be done in the S/MIME layer code
* after signature of a signerinfo is verified
*/
SECStatus
NSS_SMIMESignerInfo_SaveSMIMEProfile(NSSCMSSignerInfo *signerinfo)
{
CERTCertificate *cert = NULL;
SECItem *profile = NULL;
NSSCMSAttribute *attr;
SECItem *stime = NULL;
SECItem *ekp;
CERTCertDBHandle *certdb;
int save_error;
SECStatus rv;
PRBool must_free_cert = PR_FALSE;
certdb = CERT_GetDefaultCertDB();
/* sanity check - see if verification status is ok (unverified does not count...) */
if (signerinfo->verificationStatus != NSSCMSVS_GoodSignature)
return SECFailure;
/* find preferred encryption cert */
if (!NSS_CMSArray_IsEmpty((void **)signerinfo->authAttr) &&
(attr = NSS_CMSAttributeArray_FindAttrByOidTag(signerinfo->authAttr,
SEC_OID_SMIME_ENCRYPTION_KEY_PREFERENCE, PR_TRUE)) != NULL) { /* we have a SMIME_ENCRYPTION_KEY_PREFERENCE attribute! */
ekp = NSS_CMSAttribute_GetValue(attr);
if (ekp == NULL)
return SECFailure;
/* we assume that all certs coming with the message have been imported to the */
/* temporary database */
cert = NSS_SMIMEUtil_GetCertFromEncryptionKeyPreference(certdb, ekp);
if (cert == NULL)
return SECFailure;
must_free_cert = PR_TRUE;
}
if (cert == NULL) {
/* no preferred cert found?
* find the cert the signerinfo is signed with instead */
cert = NSS_CMSSignerInfo_GetSigningCertificate(signerinfo, certdb);
if (cert == NULL || cert->emailAddr == NULL || !cert->emailAddr[0])
return SECFailure;
}
/* verify this cert for encryption (has been verified for signing so far) */
/* don't verify this cert for encryption. It may just be a signing cert.
* that's OK, we can still save the S/MIME profile. The encryption cert
* should have already been saved */
#ifdef notdef
if (CERT_VerifyCert(certdb, cert, PR_TRUE, certUsageEmailRecipient, PR_Now(), signerinfo->cmsg->pwfn_arg, NULL) != SECSuccess) {
if (must_free_cert)
CERT_DestroyCertificate(cert);
return SECFailure;
}
#endif
/* XXX store encryption cert permanently? */
/*
* Remember the current error set because we do not care about
* anything set by the functions we are about to call.
*/
save_error = PORT_GetError();
if (!NSS_CMSArray_IsEmpty((void **)signerinfo->authAttr)) {
attr = NSS_CMSAttributeArray_FindAttrByOidTag(signerinfo->authAttr,
SEC_OID_PKCS9_SMIME_CAPABILITIES,
PR_TRUE);
profile = NSS_CMSAttribute_GetValue(attr);
attr = NSS_CMSAttributeArray_FindAttrByOidTag(signerinfo->authAttr,
SEC_OID_PKCS9_SIGNING_TIME,
PR_TRUE);
stime = NSS_CMSAttribute_GetValue(attr);
}
rv = CERT_SaveSMimeProfile(cert, profile, stime);
if (must_free_cert)
CERT_DestroyCertificate(cert);
/*
* Restore the saved error in case the calls above set a new
* one that we do not actually care about.
*/
PORT_SetError(save_error);
return rv;
}
/*
* NSS_CMSSignerInfo_IncludeCerts - set cert chain inclusion mode for this signer
*/
SECStatus
NSS_CMSSignerInfo_IncludeCerts(NSSCMSSignerInfo *signerinfo,
NSSCMSCertChainMode cm, SECCertUsage usage)
{
if (signerinfo->cert == NULL)
return SECFailure;
/* don't leak if we get called twice */
if (signerinfo->certList != NULL) {
CERT_DestroyCertificateList(signerinfo->certList);
signerinfo->certList = NULL;
}
switch (cm) {
case NSSCMSCM_None:
signerinfo->certList = NULL;
break;
case NSSCMSCM_CertOnly:
signerinfo->certList = CERT_CertListFromCert(signerinfo->cert);
break;
case NSSCMSCM_CertChain:
signerinfo->certList = CERT_CertChainFromCert(signerinfo->cert,
usage, PR_FALSE);
break;
case NSSCMSCM_CertChainWithRoot:
signerinfo->certList = CERT_CertChainFromCert(signerinfo->cert,
usage, PR_TRUE);
break;
}
if (cm != NSSCMSCM_None && signerinfo->certList == NULL)
return SECFailure;
return SECSuccess;
}
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