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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /security/nss/lib/smime/cmssiginfo.c
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'security/nss/lib/smime/cmssiginfo.c')
-rw-r--r--security/nss/lib/smime/cmssiginfo.c1024
1 files changed, 1024 insertions, 0 deletions
diff --git a/security/nss/lib/smime/cmssiginfo.c b/security/nss/lib/smime/cmssiginfo.c
new file mode 100644
index 000000000..ce4f87c0a
--- /dev/null
+++ b/security/nss/lib/smime/cmssiginfo.c
@@ -0,0 +1,1024 @@
+/* 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 "key.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 ??? */
+}
+
+/*
+ * NSS_CMSSignerInfo_Sign - sign something
+ *
+ */
+SECStatus
+NSS_CMSSignerInfo_Sign(NSSCMSSignerInfo *signerinfo, SECItem *digest,
+ SECItem *contentType)
+{
+ CERTCertificate *cert;
+ SECKEYPrivateKey *privkey = NULL;
+ SECOidTag digestalgtag;
+ SECOidTag pubkAlgTag;
+ 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 (signerinfo->signerIdentifier.identifierType == NSSCMSSignerID_SubjectKeyID) {
+ SECOID_DestroyAlgorithmID(&freeAlgID, PR_FALSE);
+ }
+
+ if (signerinfo->authAttr != NULL) {
+ SECOidTag signAlgTag;
+ 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;
+
+ signAlgTag = SEC_GetSignatureAlgorithmOidTag(privkey->keyType,
+ digestalgtag);
+ if (signAlgTag == SEC_OID_UNKNOWN) {
+ PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
+ 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);
+
+ if (SECOID_SetAlgorithmID(poolp, &(signerinfo->digestEncAlg), pubkAlgTag,
+ NULL) != SECSuccess)
+ goto loser;
+
+ 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;
+
+ 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;
+}
+
+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;
+}