static void debugShowSignerInfo(SecCmsSignedDataRef signedData)
{
#ifndef NDEBUG
int numberOfSigners = SecCmsSignedDataSignerInfoCount (signedData);
dtprintf("numberOfSigners : %d\n", numberOfSigners);
int ix;
for (ix=0;ix < numberOfSigners;ix++)
{
SecCmsSignerInfoRef sigi = SecCmsSignedDataGetSignerInfo(signedData,ix);
if (sigi)
{
CFStringRef commonName = SecCmsSignerInfoGetSignerCommonName(sigi);
const char *signerhdr = " signer : ";
if (commonName)
{
char *cn = cfStringToChar(commonName);
dtprintf("%s%s\n", signerhdr, cn);
if (cn)
free(cn);
CFReleaseNull(commonName);
}
else
dtprintf("%s<NULL>\n", signerhdr);
}
}
#endif
}
/*
* Indicate that no more CMSDecoderUpdateMessage() calls are forthcoming;
* finish decoding the message. We parse the message as best we can, up to
* but not including verifying individual signerInfos.
*/
OSStatus CMSDecoderFinalizeMessage(
CMSDecoderRef cmsDecoder)
{
if(cmsDecoder == NULL) {
return errSecParam;
}
if(cmsDecoder->decState != DS_Updating) {
return errSecParam;
}
ASSERT(cmsDecoder->decoder != NULL);
OSStatus ortn = SecCmsDecoderFinish(cmsDecoder->decoder, &cmsDecoder->cmsMsg);
cmsDecoder->decState = DS_Final;
/* SecCmsDecoderFinish destroyed the decoder even on failure */
cmsDecoder->decoder = NULL;
if(ortn) {
ortn = cmsRtnToOSStatus(ortn, errSecUnknownFormat);
CSSM_PERROR("SecCmsDecoderFinish", ortn);
return ortn;
}
ASSERT(cmsDecoder->cmsMsg != NULL);
cmsDecoder->wasEncrypted = SecCmsMessageIsEncrypted(cmsDecoder->cmsMsg);
/* Look for a SignedData */
int numContentInfos = SecCmsMessageContentLevelCount(cmsDecoder->cmsMsg);
int dex;
for(dex=0; dex<numContentInfos; dex++) {
SecCmsContentInfoRef ci = SecCmsMessageContentLevel(cmsDecoder->cmsMsg, dex);
SECOidTag tag = SecCmsContentInfoGetContentTypeTag(ci);
switch(tag) {
case SEC_OID_PKCS7_SIGNED_DATA:
cmsDecoder->signedData =
(SecCmsSignedDataRef)SecCmsContentInfoGetContent(ci);
/* dig down one more layer for eContentType */
ci = SecCmsSignedDataGetContentInfo(cmsDecoder->signedData);
cmsDecoder->eContentType = SecCmsContentInfoGetContentTypeOID(ci);
break;
default:
break;
}
if(cmsDecoder->signedData != NULL) {
break;
}
}
/* minimal processing of optional signedData... */
if(cmsDecoder->signedData != NULL) {
cmsDecoder->numSigners = (size_t)
SecCmsSignedDataSignerInfoCount(cmsDecoder->signedData);
if(cmsDecoder->detachedContent != NULL) {
/* time to calculate digests from detached content */
ortn = cmsDigestDetachedContent(cmsDecoder);
}
}
return ortn;
}
void Download::Initialize (CFDataRef ticket,
SecureDownloadTrustSetupCallback setup,
void* setupContext,
SecureDownloadTrustEvaluateCallback evaluate,
void* evaluateContext)
{
// decode the ticket
SecCmsMessageRef cmsMessage = GetCmsMessageFromData (ticket);
// get a policy
SecPolicyRef policy = GetPolicy ();
// parse the CMS message
int contentLevelCount = SecCmsMessageContentLevelCount (cmsMessage);
SecCmsSignedDataRef signedData;
OSStatus result;
int i = 0;
while (i < contentLevelCount)
{
SecCmsContentInfoRef contentInfo = SecCmsMessageContentLevel (cmsMessage, i++);
SECOidTag contentTypeTag = SecCmsContentInfoGetContentTypeTag (contentInfo);
if (contentTypeTag != SEC_OID_PKCS7_SIGNED_DATA)
{
continue;
}
signedData = (SecCmsSignedDataRef) SecCmsContentInfoGetContent (contentInfo);
if (signedData == NULL)
{
MacOSError::throwMe (errSecureDownloadInvalidTicket);
}
// import the certificates found in the cms message
result = SecCmsSignedDataImportCerts (signedData, NULL, certUsageObjectSigner, true);
if (result != 0)
{
MacOSError::throwMe (errSecureDownloadInvalidTicket);
}
int numberOfSigners = SecCmsSignedDataSignerInfoCount (signedData);
int j;
if (numberOfSigners == 0) // no signers? This is a possible attack
{
MacOSError::throwMe (errSecureDownloadInvalidTicket);
}
for (j = 0; j < numberOfSigners; ++j)
{
SecTrustResultType resultType;
// do basic verification of the message
SecTrustRef trustRef;
result = SecCmsSignedDataVerifySignerInfo (signedData, j, NULL, policy, &trustRef);
// notify the user of the new trust ref
if (setup != NULL)
{
SecureDownloadTrustCallbackResult tcResult = setup (trustRef, setupContext);
switch (tcResult)
{
case kSecureDownloadDoNotEvaluateSigner:
continue;
case kSecureDownloadFailEvaluation:
MacOSError::throwMe (errSecureDownloadInvalidTicket);
case kSecureDownloadEvaluateSigner:
break;
}
}
if (result != 0)
{
MacOSError::throwMe (errSecureDownloadInvalidTicket);
}
result = SecTrustEvaluate (trustRef, &resultType);
if (result != noErr)
{
MacOSError::throwMe (errSecureDownloadInvalidTicket);
}
if (evaluate != NULL)
{
resultType = evaluate (trustRef, resultType, evaluateContext);
}
GoOrNoGo (resultType);
}
}
// extract the message
CSSM_DATA_PTR message = SecCmsMessageGetContent (cmsMessage);
CFDataRef ticketData = CFDataCreateWithBytesNoCopy (NULL, message->Data, message->Length, kCFAllocatorNull);
CheckCFThingForNULL (ticketData);
ParseTicket (ticketData);
// setup for hashing
CC_SHA256_Init (&mSHA256Context);
// clean up
CFRelease (ticketData);
SecCmsMessageDestroy (cmsMessage);
}
/*
* SecCmsSignedDataEncodeAfterData - do all the necessary things to a SignedData
* after all the encapsulated data was passed through the encoder.
*
* In detail:
* - create the signatures in all the SignerInfos
*
* Please note that nothing is done to the Certificates and CRLs in the message - this
* is entirely the responsibility of our callers.
*/
OSStatus
SecCmsSignedDataEncodeAfterData(SecCmsSignedDataRef sigd)
{
SecCmsSignerInfoRef *signerinfos, signerinfo;
SecCmsContentInfoRef cinfo;
SECOidTag digestalgtag;
OSStatus ret = SECFailure;
OSStatus rv;
CSSM_DATA_PTR contentType;
int certcount;
int i, ci, n, rci, si;
PLArenaPool *poolp;
CFArrayRef certlist;
extern const SecAsn1Template SecCmsSignerInfoTemplate[];
poolp = sigd->cmsg->poolp;
cinfo = &(sigd->contentInfo);
/* did we have digest calculation going on? */
if (cinfo->digcx) {
rv = SecCmsDigestContextFinishMultiple(cinfo->digcx, (SecArenaPoolRef)poolp, &(sigd->digests));
if (rv != SECSuccess)
goto loser; /* error has been set by SecCmsDigestContextFinishMultiple */
cinfo->digcx = NULL;
}
signerinfos = sigd->signerInfos;
certcount = 0;
/* prepare all the SignerInfos (there may be none) */
for (i=0; i < SecCmsSignedDataSignerInfoCount(sigd); i++) {
signerinfo = SecCmsSignedDataGetSignerInfo(sigd, i);
/* find correct digest for this signerinfo */
digestalgtag = SecCmsSignerInfoGetDigestAlgTag(signerinfo);
n = SecCmsAlgArrayGetIndexByAlgTag(sigd->digestAlgorithms, digestalgtag);
if (n < 0 || sigd->digests == NULL || sigd->digests[n] == NULL) {
/* oops - digest not found */
PORT_SetError(SEC_ERROR_DIGEST_NOT_FOUND);
goto loser;
}
/* XXX if our content is anything else but data, we need to force the
* presence of signed attributes (RFC2630 5.3 "signedAttributes is a
* collection...") */
/* pass contentType here as we want a contentType attribute */
if ((contentType = SecCmsContentInfoGetContentTypeOID(cinfo)) == NULL)
goto loser;
/* sign the thing */
rv = SecCmsSignerInfoSign(signerinfo, sigd->digests[n], contentType);
if (rv != SECSuccess)
goto loser;
/* while we're at it, count number of certs in certLists */
certlist = SecCmsSignerInfoGetCertList(signerinfo);
if (certlist)
certcount += CFArrayGetCount(certlist);
}
/* Now we can get a timestamp, since we have all the digests */
// We force the setting of a callback, since this is the most usual case
if (!sigd->cmsg->tsaCallback)
SecCmsMessageSetTSACallback(sigd->cmsg, (SecCmsTSACallback)SecCmsTSADefaultCallback);
if (sigd->cmsg->tsaCallback && sigd->cmsg->tsaContext)
{
CSSM_DATA tsaResponse = {0,};
SecAsn1TSAMessageImprint messageImprint = {{{0},},{0,}};
// <rdar://problem/11073466> Add nonce support for timestamping client
uint64_t nonce = 0;
require_noerr(getRandomNonce(&nonce), tsxit);
dprintf("SecCmsSignedDataSignerInfoCount: %d\n", SecCmsSignedDataSignerInfoCount(sigd));
// Calculate hash of encDigest and put in messageImprint.hashedMessage
SecCmsSignerInfoRef signerinfo = SecCmsSignedDataGetSignerInfo(sigd, 0); // NB - assume 1 signer only!
CSSM_DATA *encDigest = SecCmsSignerInfoGetEncDigest(signerinfo);
require_noerr(createTSAMessageImprint(sigd, encDigest, &messageImprint), tsxit);
// Callback to fire up XPC service to talk to TimeStamping server, etc.
require_noerr(rv =(*sigd->cmsg->tsaCallback)(sigd->cmsg->tsaContext, &messageImprint,
nonce, &tsaResponse), tsxit);
require_noerr(rv = validateTSAResponseAndAddTimeStamp(signerinfo, &tsaResponse, nonce), tsxit);
/*
It is likely that every occurrence of "goto loser" in this file should
also do a PORT_SetError. Since it is not clear what might depend on this
behavior, we just do this in the timestamping case.
*/
tsxit:
if (rv)
{
dprintf("Original timestamp error: %d\n", (int)rv);
rv = remapTimestampError(rv);
PORT_SetError(rv);
goto loser;
}
}
/* this is a SET OF, so we need to sort them guys */
rv = SecCmsArraySortByDER((void **)signerinfos, SecCmsSignerInfoTemplate, NULL);
if (rv != SECSuccess)
goto loser;
/*
* now prepare certs & crls
*/
/* count the rest of the certs */
if (sigd->certs != NULL)
certcount += CFArrayGetCount(sigd->certs);
if (certcount == 0) {
sigd->rawCerts = NULL;
} else {
/*
* Combine all of the certs and cert chains into rawcerts.
* Note: certcount is an upper bound; we may not need that many slots
* but we will allocate anyway to avoid having to do another pass.
* (The temporary space saving is not worth it.)
*
* XXX ARGH - this NEEDS to be fixed. need to come up with a decent
* SetOfDERcertficates implementation
*/
sigd->rawCerts = (CSSM_DATA_PTR *)PORT_ArenaAlloc(poolp, (certcount + 1) * sizeof(CSSM_DATA_PTR));
if (sigd->rawCerts == NULL)
return SECFailure;
/*
* XXX Want to check for duplicates and not add *any* cert that is
* already in the set. This will be more important when we start
* dealing with larger sets of certs, dual-key certs (signing and
* encryption), etc. For the time being we can slide by...
*
* XXX ARGH - this NEEDS to be fixed. need to come up with a decent
* SetOfDERcertficates implementation
*/
rci = 0;
if (signerinfos != NULL) {
for (si = 0; signerinfos[si] != NULL; si++) {
signerinfo = signerinfos[si];
for (ci = 0; ci < CFArrayGetCount(signerinfo->certList); ci++) {
sigd->rawCerts[rci] = PORT_ArenaZAlloc(poolp, sizeof(CSSM_DATA));
SecCertificateRef cert = (SecCertificateRef)CFArrayGetValueAtIndex(signerinfo->certList, ci);
SecCertificateGetData(cert, sigd->rawCerts[rci++]);
}
}
}
if (sigd->certs != NULL) {
for (ci = 0; ci < CFArrayGetCount(sigd->certs); ci++) {
sigd->rawCerts[rci] = PORT_ArenaZAlloc(poolp, sizeof(CSSM_DATA));
SecCertificateRef cert = (SecCertificateRef)CFArrayGetValueAtIndex(sigd->certs, ci);
SecCertificateGetData(cert, sigd->rawCerts[rci++]);
}
}
sigd->rawCerts[rci] = NULL;
/* this is a SET OF, so we need to sort them guys - we have the DER already, though */
SecCmsArraySort((void **)sigd->rawCerts, SecCmsUtilDERCompare, NULL, NULL);
}
ret = SECSuccess;
loser:
dprintf("SecCmsSignedDataEncodeAfterData: ret: %ld, rv: %ld\n", (long)ret, (long)rv);
return ret;
}
/*
* SecCmsSignedDataEncodeBeforeStart - do all the necessary things to a SignedData
* before start of encoding.
*
* In detail:
* - find out about the right value to put into sigd->version
* - come up with a list of digestAlgorithms (which should be the union of the algorithms
* in the signerinfos).
* If we happen to have a pre-set list of algorithms (and digest values!), we
* check if we have all the signerinfos' algorithms. If not, this is an error.
*/
OSStatus
SecCmsSignedDataEncodeBeforeStart(SecCmsSignedDataRef sigd)
{
SecCmsSignerInfoRef signerinfo;
SECOidTag digestalgtag;
CSSM_DATA_PTR dummy;
int version;
OSStatus rv;
Boolean haveDigests = PR_FALSE;
int n, i;
PLArenaPool *poolp;
poolp = sigd->cmsg->poolp;
/* we assume that we have precomputed digests if there is a list of algorithms, and */
/* a chunk of data for each of those algorithms */
if (sigd->digestAlgorithms != NULL && sigd->digests != NULL) {
for (i=0; sigd->digestAlgorithms[i] != NULL; i++) {
if (sigd->digests[i] == NULL)
break;
}
if (sigd->digestAlgorithms[i] == NULL) /* reached the end of the array? */
haveDigests = PR_TRUE; /* yes: we must have all the digests */
}
version = SEC_CMS_SIGNED_DATA_VERSION_BASIC;
/* RFC2630 5.1 "version is the syntax version number..." */
if (SecCmsContentInfoGetContentTypeTag(&(sigd->contentInfo)) != SEC_OID_PKCS7_DATA)
version = SEC_CMS_SIGNED_DATA_VERSION_EXT;
/* prepare all the SignerInfos (there may be none) */
for (i=0; i < SecCmsSignedDataSignerInfoCount(sigd); i++) {
signerinfo = SecCmsSignedDataGetSignerInfo(sigd, i);
/* RFC2630 5.1 "version is the syntax version number..." */
if (SecCmsSignerInfoGetVersion(signerinfo) != SEC_CMS_SIGNER_INFO_VERSION_ISSUERSN)
version = SEC_CMS_SIGNED_DATA_VERSION_EXT;
/* collect digestAlgorithms from SignerInfos */
/* (we need to know which algorithms we have when the content comes in) */
/* do not overwrite any existing digestAlgorithms (and digest) */
digestalgtag = SecCmsSignerInfoGetDigestAlgTag(signerinfo);
n = SecCmsAlgArrayGetIndexByAlgTag(sigd->digestAlgorithms, digestalgtag);
if (n < 0 && haveDigests) {
/* oops, there is a digestalg we do not have a digest for */
/* but we were supposed to have all the digests already... */
goto loser;
} else if (n < 0) {
/* add the digestAlgorithm & a NULL digest */
rv = SecCmsSignedDataAddDigest((SecArenaPoolRef)poolp, sigd, digestalgtag, NULL);
if (rv != SECSuccess)
goto loser;
} else {
/* found it, nothing to do */
}
}
dummy = SEC_ASN1EncodeInteger(poolp, &(sigd->version), (long)version);
if (dummy == NULL)
return SECFailure;
/* this is a SET OF, so we need to sort them guys */
rv = SecCmsArraySortByDER((void **)sigd->digestAlgorithms,
SEC_ASN1_GET(SECOID_AlgorithmIDTemplate),
(void **)sigd->digests);
if (rv != SECSuccess)
return SECFailure;
return SECSuccess;
loser:
return SECFailure;
}
