libsecurity_smime/lib/cmssigdata.c

   1 /*
   2  * The contents of this file are subject to the Mozilla Public
   3  * License Version 1.1 (the "License"); you may not use this file
   4  * except in compliance with the License. You may obtain a copy of
   5  * the License at http://www.mozilla.org/MPL/
   6  *
   7  * Software distributed under the License is distributed on an "AS
   8  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
   9  * implied. See the License for the specific language governing
  10  * rights and limitations under the License.
  11  *
  12  * The Original Code is the Netscape security libraries.
  13  *
  14  * The Initial Developer of the Original Code is Netscape
  15  * Communications Corporation.  Portions created by Netscape are
  16  * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
  17  * Rights Reserved.
  18  *
  19  * Contributor(s):
  20  *
  21  * Alternatively, the contents of this file may be used under the
  22  * terms of the GNU General Public License Version 2 or later (the
  23  * "GPL"), in which case the provisions of the GPL are applicable
  24  * instead of those above.  If you wish to allow use of your
  25  * version of this file only under the terms of the GPL and not to
  26  * allow others to use your version of this file under the MPL,
  27  * indicate your decision by deleting the provisions above and
  28  * replace them with the notice and other provisions required by
  29  * the GPL.  If you do not delete the provisions above, a recipient
  30  * may use your version of this file under either the MPL or the
  31  * GPL.
  32  */
  33
  34 /*
  35  * CMS signedData methods.
  36  */
  37
  38 #include <Security/SecCmsSignedData.h>
  39
  40 #include <Security/SecCmsContentInfo.h>
  41 #include <Security/SecCmsDigestContext.h>
  42 #include <Security/SecCmsSignerInfo.h>
  43
  44 #include "cmslocal.h"
  45
  46 #include "cert.h"
  47 #include "SecAsn1Item.h"
  48 #include "secoid.h"
  49
  50 #include <security_asn1/secasn1.h>
  51 #include <security_asn1/secerr.h>
  52 #include <security_asn1/secport.h>
  53
  54 #if !USE_CDSA_CRYPTO
  55 #include <Security/SecCertificatePriv.h>
  56 #endif
  57
  58 SecCmsSignedDataRef
  59 SecCmsSignedDataCreate(SecCmsMessageRef cmsg)
  60 {
  61     void *mark;
  62     SecCmsSignedDataRef sigd;
  63     PLArenaPool *poolp;
  64
  65     poolp = cmsg->poolp;
  66
  67     mark = PORT_ArenaMark(poolp);
  68
  69     sigd = (SecCmsSignedDataRef)PORT_ArenaZAlloc (poolp, sizeof(SecCmsSignedData));
  70     if (sigd == NULL)
  71         goto loser;
  72
  73     sigd->contentInfo.cmsg = cmsg;
  74
  75     /* signerInfos, certs, certlists, crls are all empty */
  76     /* version is set in SecCmsSignedDataFinalize() */
  77
  78     PORT_ArenaUnmark(poolp, mark);
  79     return sigd;
  80
  81 loser:
  82     PORT_ArenaRelease(poolp, mark);
  83     return NULL;
  84 }
  85
  86 void
  87 SecCmsSignedDataDestroy(SecCmsSignedDataRef sigd)
  88 {
  89     SecCmsSignerInfoRef *signerinfos, si;
  90
  91     if (sigd == NULL)
  92         return;
  93
  94     if (sigd->certs != NULL)
  95         CFRelease(sigd->certs);
  96
  97     signerinfos = sigd->signerInfos;
  98     if (signerinfos != NULL) {
  99         while ((si = *signerinfos++) != NULL)
 100             SecCmsSignerInfoDestroy(si);
 101     }
 102
 103     /* everything's in a pool, so don't worry about the storage */
 104    SecCmsContentInfoDestroy(&(sigd->contentInfo));
 105 }
 106
 107 /*
 108  * SecCmsSignedDataEncodeBeforeStart - do all the necessary things to a SignedData
 109  *     before start of encoding.
 110  *
 111  * In detail:
 112  *  - find out about the right value to put into sigd->version
 113  *  - come up with a list of digestAlgorithms (which should be the union of the algorithms
 114  *         in the signerinfos).
 115  *         If we happen to have a pre-set list of algorithms (and digest values!), we
 116  *         check if we have all the signerinfos' algorithms. If not, this is an error.
 117  */
 118 OSStatus
 119 SecCmsSignedDataEncodeBeforeStart(SecCmsSignedDataRef sigd)
 120 {
 121     SecCmsSignerInfoRef signerinfo;
 122     SECOidTag digestalgtag;
 123     SecAsn1Item * dummy;
 124     int version;
 125     OSStatus rv;
 126     Boolean haveDigests = PR_FALSE;
 127     int n, i;
 128     PLArenaPool *poolp;
 129
 130     poolp = sigd->contentInfo.cmsg->poolp;
 131
 132     /* we assume that we have precomputed digests if there is a list of algorithms, and */
 133     /* a chunk of data for each of those algorithms */
 134     if (sigd->digestAlgorithms != NULL && sigd->digests != NULL) {
 135         for (i=0; sigd->digestAlgorithms[i] != NULL; i++) {
 136             if (sigd->digests[i] == NULL)
 137                 break;
 138         }
 139         if (sigd->digestAlgorithms[i] == NULL)  /* reached the end of the array? */
 140             haveDigests = PR_TRUE;              /* yes: we must have all the digests */
 141     }
 142
 143     version = SEC_CMS_SIGNED_DATA_VERSION_BASIC;
 144
 145     /* RFC2630 5.1 "version is the syntax version number..." */
 146     if (SecCmsContentInfoGetContentTypeTag(&(sigd->contentInfo)) != SEC_OID_PKCS7_DATA)
 147         version = SEC_CMS_SIGNED_DATA_VERSION_EXT;
 148
 149     /* prepare all the SignerInfos (there may be none) */
 150     for (i=0; i < SecCmsSignedDataSignerInfoCount(sigd); i++) {
 151         signerinfo = SecCmsSignedDataGetSignerInfo(sigd, i);
 152
 153         /* RFC2630 5.1 "version is the syntax version number..." */
 154         if (SecCmsSignerInfoGetVersion(signerinfo) != SEC_CMS_SIGNER_INFO_VERSION_ISSUERSN)
 155             version = SEC_CMS_SIGNED_DATA_VERSION_EXT;
 156
 157         /* collect digestAlgorithms from SignerInfos */
 158         /* (we need to know which algorithms we have when the content comes in) */
 159         /* do not overwrite any existing digestAlgorithms (and digest) */
 160         digestalgtag = SecCmsSignerInfoGetDigestAlgTag(signerinfo);
 161         n = SecCmsAlgArrayGetIndexByAlgTag(sigd->digestAlgorithms, digestalgtag);
 162         if (n < 0 && haveDigests) {
 163             /* oops, there is a digestalg we do not have a digest for */
 164             /* but we were supposed to have all the digests already... */
 165             goto loser;
 166         } else if (n < 0) {
 167             /* add the digestAlgorithm & a NULL digest */
 168             rv = SecCmsSignedDataAddDigest(poolp, sigd, digestalgtag, NULL);
 169             if (rv != SECSuccess)
 170                 goto loser;
 171         } else {
 172             /* found it, nothing to do */
 173         }
 174     }
 175
 176     dummy = SEC_ASN1EncodeInteger(poolp, &(sigd->version), (long)version);
 177     if (dummy == NULL)
 178         return SECFailure;
 179
 180     /* this is a SET OF, so we need to sort them guys */
 181     rv = SecCmsArraySortByDER((void **)sigd->digestAlgorithms,
 182                                 SEC_ASN1_GET(SECOID_AlgorithmIDTemplate),
 183                                 (void **)sigd->digests);
 184     if (rv != SECSuccess)
 185         return SECFailure;
 186
 187     return SECSuccess;
 188
 189 loser:
 190     return SECFailure;
 191 }
 192
 193 OSStatus
 194 SecCmsSignedDataEncodeBeforeData(SecCmsSignedDataRef sigd)
 195 {
 196     /* set up the digests */
 197     if (sigd->digestAlgorithms != NULL) {
 198         sigd->contentInfo.digcx = SecCmsDigestContextStartMultiple(sigd->digestAlgorithms);
 199         if (sigd->contentInfo.digcx == NULL)
 200             return SECFailure;
 201     }
 202     return SECSuccess;
 203 }
 204
 205 /*
 206  * SecCmsSignedDataEncodeAfterData - do all the necessary things to a SignedData
 207  *     after all the encapsulated data was passed through the encoder.
 208  *
 209  * In detail:
 210  *  - create the signatures in all the SignerInfos
 211  *
 212  * Please note that nothing is done to the Certificates and CRLs in the message - this
 213  * is entirely the responsibility of our callers.
 214  */
 215 OSStatus
 216 SecCmsSignedDataEncodeAfterData(SecCmsSignedDataRef sigd)
 217 {
 218     SecCmsSignerInfoRef *signerinfos, signerinfo;
 219     SecCmsContentInfoRef cinfo;
 220     SECOidTag digestalgtag;
 221     OSStatus ret = SECFailure;
 222     OSStatus rv;
 223     SecAsn1Item * contentType;
 224     CFIndex certcount;
 225     int i, ci, n, rci, si;
 226     PLArenaPool *poolp;
 227     CFArrayRef certlist;
 228     extern const SecAsn1Template SecCmsSignerInfoTemplate[];
 229
 230     cinfo = &(sigd->contentInfo);
 231     poolp = cinfo->cmsg->poolp;
 232
 233     /* did we have digest calculation going on? */
 234     if (cinfo->digcx) {
 235         SecAsn1Item **digests = NULL;
 236         SECAlgorithmID **digestalgs = NULL;
 237         rv = SecCmsDigestContextFinishMultiple(cinfo->digcx, &digestalgs, &digests);
 238         if (rv != SECSuccess)
 239             goto loser;         /* error has been set by SecCmsDigestContextFinishMultiple */
 240         if (digestalgs && digests) {
 241             rv = SecCmsSignedDataSetDigests(sigd, digestalgs, digests);
 242             if (rv != SECSuccess)
 243                 goto loser;             /* error has been set by SecCmsSignedDataSetDigests */
 244         }
 245         SecCmsDigestContextDestroy(cinfo->digcx);
 246         cinfo->digcx = NULL;
 247     }
 248
 249     signerinfos = sigd->signerInfos;
 250     certcount = 0;
 251
 252     /* prepare all the SignerInfos (there may be none) */
 253     for (i=0; i < SecCmsSignedDataSignerInfoCount(sigd); i++) {
 254         signerinfo = SecCmsSignedDataGetSignerInfo(sigd, i);
 255
 256         /* find correct digest for this signerinfo */
 257         digestalgtag = SecCmsSignerInfoGetDigestAlgTag(signerinfo);
 258         n = SecCmsAlgArrayGetIndexByAlgTag(sigd->digestAlgorithms, digestalgtag);
 259         if (n < 0 || sigd->digests == NULL || sigd->digests[n] == NULL) {
 260             /* oops - digest not found */
 261             PORT_SetError(SEC_ERROR_DIGEST_NOT_FOUND);
 262             goto loser;
 263         }
 264
 265         /* XXX if our content is anything else but data, we need to force the
 266          * presence of signed attributes (RFC2630 5.3 "signedAttributes is a
 267          * collection...") */
 268
 269         /* pass contentType here as we want a contentType attribute */
 270         if ((contentType = SecCmsContentInfoGetContentTypeOID(cinfo)) == NULL)
 271             goto loser;
 272
 273         /* sign the thing */
 274         rv = SecCmsSignerInfoSign(signerinfo, sigd->digests[n], contentType);
 275         if (rv != SECSuccess)
 276             goto loser;
 277
 278         /* while we're at it, count number of certs in certLists */
 279         certlist = SecCmsSignerInfoGetCertList(signerinfo);
 280         if (certlist)
 281             certcount += CFArrayGetCount(certlist);
 282     }
 283
 284     /* this is a SET OF, so we need to sort them guys */
 285     rv = SecCmsArraySortByDER((void **)signerinfos, SecCmsSignerInfoTemplate, NULL);
 286     if (rv != SECSuccess)
 287         goto loser;
 288
 289     /*
 290      * now prepare certs & crls
 291      */
 292
 293     /* count the rest of the certs */
 294     if (sigd->certs != NULL)
 295         certcount += CFArrayGetCount(sigd->certs);
 296
 297     if (certcount == 0) {
 298         sigd->rawCerts = NULL;
 299     } else {
 300         /*
 301          * Combine all of the certs and cert chains into rawcerts.
 302          * Note: certcount is an upper bound; we may not need that many slots
 303          * but we will allocate anyway to avoid having to do another pass.
 304          * (The temporary space saving is not worth it.)
 305          *
 306          * XXX ARGH - this NEEDS to be fixed. need to come up with a decent
 307          *  SetOfDERcertficates implementation
 308          */
 309         sigd->rawCerts = (SecAsn1Item * *)PORT_ArenaAlloc(poolp, (certcount + 1) * sizeof(SecAsn1Item *));
 310         if (sigd->rawCerts == NULL)
 311             return SECFailure;
 312
 313         /*
 314          * XXX Want to check for duplicates and not add *any* cert that is
 315          * already in the set.  This will be more important when we start
 316          * dealing with larger sets of certs, dual-key certs (signing and
 317          * encryption), etc.  For the time being we can slide by...
 318          *
 319          * XXX ARGH - this NEEDS to be fixed. need to come up with a decent
 320          *  SetOfDERcertficates implementation
 321          */
 322         rci = 0;
 323         if (signerinfos != NULL) {
 324             for (si = 0; signerinfos[si] != NULL; si++) {
 325                 signerinfo = signerinfos[si];
 326                 for (ci = 0; ci < CFArrayGetCount(signerinfo->certList); ci++) {
 327                     sigd->rawCerts[rci] = PORT_ArenaZAlloc(poolp, sizeof(SecAsn1Item));
 328                     SecCertificateRef cert = (SecCertificateRef)CFArrayGetValueAtIndex(signerinfo->certList, ci);
 329 #if USE_CDSA_CRYPTO
 330                     SecCertificateGetData(cert, sigd->rawCerts[rci++]);
 331 #else
 332                     SecAsn1Item cert_data = { SecCertificateGetLength(cert),
 333                         (uint8_t *)SecCertificateGetBytePtr(cert) };
 334                     *(sigd->rawCerts[rci++]) = cert_data;
 335 #endif
 336                 }
 337             }
 338         }
 339
 340         if (sigd->certs != NULL) {
 341             for (ci = 0; ci < CFArrayGetCount(sigd->certs); ci++) {
 342                 sigd->rawCerts[rci] = PORT_ArenaZAlloc(poolp, sizeof(SecAsn1Item));
 343                 SecCertificateRef cert = (SecCertificateRef)CFArrayGetValueAtIndex(sigd->certs, ci);
 344 #if USE_CDSA_CRYPTO
 345                 SecCertificateGetData(cert, sigd->rawCerts[rci++]);
 346 #else
 347                     SecAsn1Item cert_data = { SecCertificateGetLength(cert),
 348                         (uint8_t *)SecCertificateGetBytePtr(cert) };
 349                     *(sigd->rawCerts[rci++]) = cert_data;
 350 #endif
 351             }
 352         }
 353
 354         sigd->rawCerts[rci] = NULL;
 355
 356         /* this is a SET OF, so we need to sort them guys - we have the DER already, though */
 357         SecCmsArraySort((void **)sigd->rawCerts, SecCmsUtilDERCompare, NULL, NULL);
 358     }
 359
 360     ret = SECSuccess;
 361
 362 loser:
 363     return ret;
 364 }
 365
 366 OSStatus
 367 SecCmsSignedDataDecodeBeforeData(SecCmsSignedDataRef sigd)
 368 {
 369     /* set up the digests, if we have digest algorithms, no digests yet, and content is attached */
 370     if (sigd->digestAlgorithms != NULL && sigd->digests == NULL /* && sigd->contentInfo.content.pointer != NULL*/) {
 371         /* if digests are already there, do nothing */
 372         sigd->contentInfo.digcx = SecCmsDigestContextStartMultiple(sigd->digestAlgorithms);
 373         if (sigd->contentInfo.digcx == NULL)
 374             return SECFailure;
 375     }
 376     return SECSuccess;
 377 }
 378
 379 /*
 380  * SecCmsSignedDataDecodeAfterData - do all the necessary things to a SignedData
 381  *     after all the encapsulated data was passed through the decoder.
 382  */
 383 OSStatus
 384 SecCmsSignedDataDecodeAfterData(SecCmsSignedDataRef sigd)
 385 {
 386     OSStatus rv = SECSuccess;
 387
 388     /* did we have digest calculation going on? */
 389     if (sigd->contentInfo.digcx) {
 390         /* @@@ we should see if data was absent vs. zero length */
 391         if (sigd->contentInfo.content.data && sigd->contentInfo.content.data->Length) {
 392             SecAsn1Item * *digests = NULL;
 393             SECAlgorithmID **digestalgs = NULL;
 394             rv = SecCmsDigestContextFinishMultiple(sigd->contentInfo.digcx, &digestalgs, &digests);
 395             if (rv != SECSuccess)
 396                 goto loser;             /* error has been set by SecCmsDigestContextFinishMultiple */
 397             rv = SecCmsSignedDataSetDigests(sigd, digestalgs, digests);
 398             if (rv != SECSuccess)
 399                 goto loser;             /* error has been set by SecCmsSignedDataSetDigests */
 400         }
 401         SecCmsDigestContextDestroy(sigd->contentInfo.digcx);
 402         sigd->contentInfo.digcx = NULL;
 403     }
 404
 405 loser:
 406     return rv;
 407 }
 408
 409 /*
 410  * SecCmsSignedDataDecodeAfterEnd - do all the necessary things to a SignedData
 411  *     after all decoding is finished.
 412  */
 413 OSStatus
 414 SecCmsSignedDataDecodeAfterEnd(SecCmsSignedDataRef sigd)
 415 {
 416     SecCmsSignerInfoRef *signerinfos;
 417     int i;
 418
 419     if (!sigd) {
 420         return SECFailure;
 421     }
 422
 423     /* set cmsg for all the signerinfos */
 424     signerinfos = sigd->signerInfos;
 425
 426     /* set signedData for all the signerinfos */
 427     if (signerinfos) {
 428         for (i = 0; signerinfos[i] != NULL; i++)
 429             signerinfos[i]->signedData = sigd;
 430     }
 431
 432     return SECSuccess;
 433 }
 434
 435 /*
 436  * SecCmsSignedDataGetSignerInfos - retrieve the SignedData's signer list
 437  */
 438 SecCmsSignerInfoRef *
 439 SecCmsSignedDataGetSignerInfos(SecCmsSignedDataRef sigd)
 440 {
 441     return sigd->signerInfos;
 442 }
 443
 444 int
 445 SecCmsSignedDataSignerInfoCount(SecCmsSignedDataRef sigd)
 446 {
 447     return SecCmsArrayCount((void **)sigd->signerInfos);
 448 }
 449
 450 SecCmsSignerInfoRef
 451 SecCmsSignedDataGetSignerInfo(SecCmsSignedDataRef sigd, int i)
 452 {
 453     return sigd->signerInfos[i];
 454 }
 455
 456 /*
 457  * SecCmsSignedDataGetDigestAlgs - retrieve the SignedData's digest algorithm list
 458  */
 459 SECAlgorithmID **
 460 SecCmsSignedDataGetDigestAlgs(SecCmsSignedDataRef sigd)
 461 {
 462     return sigd->digestAlgorithms;
 463 }
 464
 465 /*
 466  * SecCmsSignedDataGetContentInfo - return pointer to this signedData's contentinfo
 467  */
 468 SecCmsContentInfoRef
 469 SecCmsSignedDataGetContentInfo(SecCmsSignedDataRef sigd)
 470 {
 471     return &(sigd->contentInfo);
 472 }
 473
 474 /*
 475  * SecCmsSignedDataGetCertificateList - retrieve the SignedData's certificate list
 476  */
 477 SecAsn1Item * *
 478 SecCmsSignedDataGetCertificateList(SecCmsSignedDataRef sigd)
 479 {
 480     return sigd->rawCerts;
 481 }
 482
 483 OSStatus
 484 SecCmsSignedDataImportCerts(SecCmsSignedDataRef sigd, SecKeychainRef keychain,
 485                                 SECCertUsage certusage, Boolean keepcerts)
 486 {
 487     OSStatus rv = -1;
 488
 489 #if USE_CDSA_CRYPTO
 490     int ix, certcount = SecCmsArrayCount((void **)sigd->rawCerts);
 491     rv = CERT_ImportCerts(keychain, certusage, certcount, sigd->rawCerts, NULL,
 492                           keepcerts, PR_FALSE, NULL);
 493     /* XXX CRL handling */
 494
 495     if (sigd->signerInfos != NULL) {
 496         /* fill in all signerinfo's certs */
 497         for (ix = 0; sigd->signerInfos[ix] != NULL; i++)
 498             (void)SecCmsSignerInfoGetSigningCertificate(sigd->signerInfos[ix], keychain);
 499     }
 500 #else
 501     // XXX we should only ever import certs for a cert only data blob
 502 #endif
 503
 504     return rv;
 505 }
 506
 507 /*
 508  * XXX the digests need to be passed in BETWEEN the decoding and the verification in case
 509  *     of external signatures!
 510  */
 511
 512
 513 /*
 514  * SecCmsSignedDataVerifySignerInfo - check the signatures.
 515  *
 516  * The digests were either calculated during decoding (and are stored in the
 517  * signedData itself) or set after decoding using SecCmsSignedDataSetDigests.
 518  *
 519  * The verification checks if the signing cert is valid and has a trusted chain
 520  * for the purpose specified by "policies".
 521  *
 522  * If trustRef is NULL the cert chain is verified and the VerificationStatus is set accordingly.
 523  * Otherwise a SecTrust object is returned for the caller to evaluate using SecTrustEvaluate().
 524  */
 525 OSStatus
 526 SecCmsSignedDataVerifySignerInfo(SecCmsSignedDataRef sigd, int i,
 527                             SecKeychainRef keychainOrArray, CFTypeRef policies, SecTrustRef *trustRef)
 528 {
 529     SecCmsSignerInfoRef signerinfo;
 530     SecCmsContentInfoRef cinfo;
 531     SECOidData *algiddata;
 532     SecAsn1Item *contentType, *digest;
 533     OSStatus status;
 534
 535     if (sigd == NULL || sigd->signerInfos == NULL || i >= SecCmsSignedDataSignerInfoCount(sigd)) {
 536         return errSecParam;
 537     }
 538
 539     cinfo = &(sigd->contentInfo);
 540     signerinfo = sigd->signerInfos[i];
 541
 542     /* Signature or digest level verificationStatus errors should supercede
 543        certificate level errors, so check the digest and signature first.  */
 544
 545     /* Find digest and contentType for signerinfo */
 546     algiddata = SecCmsSignerInfoGetDigestAlg(signerinfo);
 547     if (algiddata == NULL) {
 548         return errSecInvalidDigestAlgorithm;
 549     }
 550
 551     if (!sigd->digests) {
 552         SECAlgorithmID **digestalgs = SecCmsSignedDataGetDigestAlgs(sigd);
 553         SecCmsDigestContextRef digcx = SecCmsDigestContextStartMultiple(digestalgs);
 554         SecCmsSignedDataSetDigestContext(sigd, digcx);
 555         SecCmsDigestContextDestroy(digcx);
 556     }
 557
 558     digest = SecCmsSignedDataGetDigestByAlgTag(sigd, algiddata->offset);
 559     if (digest == NULL) {
 560         return errSecDataNotAvailable;
 561     }
 562
 563     contentType = SecCmsContentInfoGetContentTypeOID(cinfo);
 564
 565     /* verify signature */
 566     status = SecCmsSignerInfoVerify(signerinfo, digest, contentType);
 567 #if SECTRUST_VERBOSE_DEBUG
 568         syslog(LOG_ERR, "SecCmsSignedDataVerifySignerInfo: SecCmsSignerInfoVerify returned %d, will %sverify cert",
 569                 (int)status, (status) ? "NOT " : "");
 570 #endif
 571     if (status) {
 572         return status;
 573     }
 574
 575     /* Now verify the certificate.  We only do this when the signature verification succeeds. Note that this
 576        behavior is different than the macOS code. */
 577     status = SecCmsSignerInfoVerifyCertificate(signerinfo, keychainOrArray, policies, trustRef);
 578 #if SECTRUST_VERBOSE_DEBUG
 579         syslog(LOG_ERR, "SecCmsSignedDataVerifySignerInfo: SecCmsSignerInfoVerifyCertificate returned %d", (int)status);
 580 #endif
 581
 582     return status;
 583 }
 584
 585 #if USE_CDSA_CRYPTO
 586
 587 /*
 588  * SecCmsSignedDataVerifyCertsOnly - verify the certs in a certs-only message
 589  */
 590 OSStatus
 591 SecCmsSignedDataVerifyCertsOnly(SecCmsSignedDataRef sigd,
 592                                   SecKeychainRef keychainOrArray,
 593                                   CFTypeRef policies)
 594 {
 595     SecCertificateRef cert;
 596     OSStatus rv = SECSuccess;
 597     int i;
 598     int count;
 599
 600     if (!sigd || !keychainOrArray || !sigd->rawCerts) {
 601         PORT_SetError(SEC_ERROR_INVALID_ARGS);
 602         return SECFailure;
 603     }
 604
 605     count = SecCmsArrayCount((void**)sigd->rawCerts);
 606     for (i=0; i < count; i++) {
 607         if (sigd->certs && CFArrayGetCount(sigd->certs) > i) {
 608             cert = (SecCertificateRef)CFArrayGetValueAtIndex(sigd->certs, i);
 609             CFRetain(cert);
 610         } else {
 611             cert = CERT_FindCertByDERCert(keychainOrArray, sigd->rawCerts[i]);
 612             if (!cert) {
 613                 rv = SECFailure;
 614                 break;
 615             }
 616         }
 617         rv |= CERT_VerifyCert(keychainOrArray, cert, policies, CFAbsoluteTimeGetCurrent(), NULL);
 618         CFRelease(cert);
 619     }
 620
 621     return rv;
 622 }
 623 #else
 624 OSStatus
 625 SecCmsSignedDataVerifyCertsOnly(SecCmsSignedDataRef sigd,
 626                                   SecKeychainRef keychainOrArray,
 627                                   CFTypeRef policies)
 628 {
 629     OSStatus rv = SECSuccess;
 630
 631     if (!sigd || !keychainOrArray || !sigd->rawCerts) {
 632         PORT_SetError(SEC_ERROR_INVALID_ARGS);
 633         return SECFailure;
 634     }
 635
 636     SecAsn1Item **cert_datas = sigd->rawCerts;
 637     SecAsn1Item *cert_data;
 638     while ((cert_data = *cert_datas++) != NULL) {
 639         SecCertificateRef cert = SecCertificateCreateWithBytes(NULL, cert_data->Data, cert_data->Length);
 640         if (cert) {
 641             CFArrayRef certs = CFArrayCreate(kCFAllocatorDefault, (const void **)&cert, 1, NULL);
 642             rv |= CERT_VerifyCert(keychainOrArray, certs, policies, CFAbsoluteTimeGetCurrent(), NULL);
 643             CFRelease(certs);
 644             CFRelease(cert);
 645         }
 646         else
 647             rv |= SECFailure;
 648     }
 649
 650     return rv;
 651 }
 652 #endif
 653
 654 /*
 655  * SecCmsSignedDataHasDigests - see if we have digests in place
 656  */
 657 Boolean
 658 SecCmsSignedDataHasDigests(SecCmsSignedDataRef sigd)
 659 {
 660     return (sigd->digests != NULL);
 661 }
 662
 663 OSStatus
 664 SecCmsSignedDataAddCertList(SecCmsSignedDataRef sigd, CFArrayRef certlist)
 665 {
 666     PORT_Assert(certlist != NULL);
 667
 668     if (certlist == NULL)
 669         return SECFailure;
 670
 671     if (!sigd->certs)
 672         sigd->certs = CFArrayCreateMutableCopy(NULL, 0, certlist);
 673     else
 674     {
 675         CFRange certlistRange = { 0, CFArrayGetCount(certlist) };
 676         CFArrayAppendArray(sigd->certs, certlist, certlistRange);
 677     }
 678
 679     return SECSuccess;
 680 }
 681
 682 /*
 683  * SecCmsSignedDataAddCertChain - add cert and its entire chain to the set of certs
 684  */
 685 OSStatus
 686 SecCmsSignedDataAddCertChain(SecCmsSignedDataRef sigd, SecCertificateRef cert)
 687 {
 688     CFArrayRef certlist;
 689     SECCertUsage usage;
 690     OSStatus rv;
 691
 692     usage = certUsageEmailSigner;
 693
 694     /* do not include root */
 695     certlist = CERT_CertChainFromCert(cert, usage, PR_FALSE, PR_FALSE);
 696     if (certlist == NULL)
 697         return SECFailure;
 698
 699     rv = SecCmsSignedDataAddCertList(sigd, certlist);
 700     CFRelease(certlist);
 701
 702     return rv;
 703 }
 704
 705 OSStatus
 706 SecCmsSignedDataAddCertificate(SecCmsSignedDataRef sigd, SecCertificateRef cert)
 707 {
 708     PORT_Assert(cert != NULL);
 709
 710     if (cert == NULL)
 711         return SECFailure;
 712
 713     if (!sigd->certs)
 714         sigd->certs = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
 715
 716     CFArrayAppendValue(sigd->certs, cert);
 717
 718     return SECSuccess;
 719 }
 720
 721 Boolean
 722 SecCmsSignedDataContainsCertsOrCrls(SecCmsSignedDataRef sigd)
 723 {
 724     if (sigd->rawCerts != NULL && sigd->rawCerts[0] != NULL)
 725         return PR_TRUE;
 726     else if (sigd->rawCrls != NULL && sigd->rawCrls[0] != NULL)
 727         return PR_TRUE;
 728     else
 729         return PR_FALSE;
 730 }
 731
 732 OSStatus
 733 SecCmsSignedDataAddSignerInfo(SecCmsSignedDataRef sigd,
 734                               SecCmsSignerInfoRef signerinfo)
 735 {
 736     void *mark;
 737     OSStatus rv;
 738     SECOidTag digestalgtag;
 739     PLArenaPool *poolp;
 740
 741     poolp = sigd->contentInfo.cmsg->poolp;
 742
 743     mark = PORT_ArenaMark(poolp);
 744
 745     /* add signerinfo */
 746     rv = SecCmsArrayAdd(poolp, (void ***)&(sigd->signerInfos), (void *)signerinfo);
 747     if (rv != SECSuccess)
 748         goto loser;
 749
 750     /*
 751      * add empty digest
 752      * Empty because we don't have it yet. Either it gets created during encoding
 753      * (if the data is present) or has to be set externally.
 754      * XXX maybe pass it in optionally?
 755      */
 756     digestalgtag = SecCmsSignerInfoGetDigestAlgTag(signerinfo);
 757     rv = SecCmsSignedDataSetDigestValue(sigd, digestalgtag, NULL);
 758     if (rv != SECSuccess)
 759         goto loser;
 760
 761     /*
 762      * The last thing to get consistency would be adding the digest.
 763      */
 764
 765     PORT_ArenaUnmark(poolp, mark);
 766     return SECSuccess;
 767
 768 loser:
 769     PORT_ArenaRelease (poolp, mark);
 770     return SECFailure;
 771 }
 772
 773 SecAsn1Item *
 774 SecCmsSignedDataGetDigestByAlgTag(SecCmsSignedDataRef sigd, SECOidTag algtag)
 775 {
 776     int idx;
 777
 778     if(sigd == NULL || sigd->digests == NULL) {
 779         return NULL;
 780     }
 781     idx = SecCmsAlgArrayGetIndexByAlgTag(sigd->digestAlgorithms, algtag);
 782     return (idx >= 0)?(sigd->digests)[idx]:NULL;
 783 }
 784
 785 OSStatus
 786 SecCmsSignedDataSetDigestContext(SecCmsSignedDataRef sigd,
 787                                  SecCmsDigestContextRef digestContext)
 788 {
 789     SECAlgorithmID **digestalgs;
 790     SecAsn1Item * *digests;
 791
 792     if (SecCmsDigestContextFinishMultiple(digestContext, &digestalgs, &digests) != SECSuccess)
 793         goto loser;
 794     if (SecCmsSignedDataSetDigests(sigd, digestalgs, digests) != SECSuccess)
 795         goto loser;
 796
 797     return 0;
 798 loser:
 799     return PORT_GetError();
 800 }
 801
 802 /*
 803  * SecCmsSignedDataSetDigests - set a signedData's digests member
 804  *
 805  * "digestalgs" - array of digest algorithm IDs
 806  * "digests"    - array of digests corresponding to the digest algorithms
 807  */
 808 OSStatus
 809 SecCmsSignedDataSetDigests(SecCmsSignedDataRef sigd,
 810                                 SECAlgorithmID **digestalgs,
 811                                 SecAsn1Item * *digests)
 812 {
 813     int cnt, i, idx;
 814
 815     /* Check input structure and items in structure */
 816     if (sigd == NULL || sigd->digestAlgorithms == NULL || sigd->contentInfo.cmsg == NULL ||
 817         sigd->contentInfo.cmsg->poolp == NULL) {
 818         PORT_SetError(SEC_ERROR_INVALID_ARGS);
 819         return SECFailure;
 820     }
 821
 822     /* Since we'll generate a empty digest for content-less messages
 823        whether or not they're detached, we have to avoid overwriting
 824        externally set digest for detached content => return early */
 825     if (sigd->digests && sigd->digests[0])
 826         return 0;
 827
 828     /* we assume that the digests array is just not there yet */
 829 /*
 830     PORT_Assert(sigd->digests == NULL);
 831     if (sigd->digests != NULL) {
 832         PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
 833         return SECFailure;
 834     }
 835 */
 836     /* now allocate one (same size as digestAlgorithms) */
 837     if (sigd->digests == NULL) {
 838         cnt = SecCmsArrayCount((void **)sigd->digestAlgorithms);
 839         sigd->digests = PORT_ArenaZAlloc(sigd->contentInfo.cmsg->poolp, (cnt + 1) * sizeof(SecAsn1Item *));
 840         if (sigd->digests == NULL) {
 841             PORT_SetError(SEC_ERROR_NO_MEMORY);
 842             return SECFailure;
 843         }
 844     }
 845
 846     for (i = 0; sigd->digestAlgorithms[i] != NULL; i++) {
 847         /* try to find the sigd's i'th digest algorithm in the array we passed in */
 848         idx = SecCmsAlgArrayGetIndexByAlgID(digestalgs, sigd->digestAlgorithms[i]);
 849         if (idx < 0) {
 850             PORT_SetError(SEC_ERROR_DIGEST_NOT_FOUND);
 851             return SECFailure;
 852         }
 853
 854         /* found it - now set it */
 855         if ((sigd->digests[i] = SECITEM_AllocItem(sigd->contentInfo.cmsg->poolp, NULL, 0)) == NULL ||
 856             SECITEM_CopyItem(sigd->contentInfo.cmsg->poolp, sigd->digests[i], digests[idx]) != SECSuccess)
 857         {
 858             PORT_SetError(SEC_ERROR_NO_MEMORY);
 859             return SECFailure;
 860         }
 861     }
 862     return SECSuccess;
 863 }
 864
 865 OSStatus
 866 SecCmsSignedDataSetDigestValue(SecCmsSignedDataRef sigd,
 867                                 SECOidTag digestalgtag,
 868                                 SecAsn1Item * digestdata)
 869 {
 870     SecAsn1Item * digest = NULL;
 871     PLArenaPool *poolp;
 872     void *mark;
 873     int n, cnt;
 874
 875     poolp = sigd->contentInfo.cmsg->poolp;
 876
 877     mark = PORT_ArenaMark(poolp);
 878
 879
 880     if (digestdata) {
 881         digest = (SecAsn1Item *) PORT_ArenaZAlloc(poolp,sizeof(SecAsn1Item));
 882
 883         /* copy digestdata item to arena (in case we have it and are not only making room) */
 884         if (SECITEM_CopyItem(poolp, digest, digestdata) != SECSuccess)
 885             goto loser;
 886     }
 887
 888     /* now allocate one (same size as digestAlgorithms) */
 889     if (sigd->digests == NULL) {
 890         cnt = SecCmsArrayCount((void **)sigd->digestAlgorithms);
 891         sigd->digests = PORT_ArenaZAlloc(sigd->contentInfo.cmsg->poolp, (cnt + 1) * sizeof(SecAsn1Item *));
 892         if (sigd->digests == NULL) {
 893                 PORT_SetError(SEC_ERROR_NO_MEMORY);
 894                 return SECFailure;
 895         }
 896     }
 897
 898     n = -1;
 899     if (sigd->digestAlgorithms != NULL)
 900         n = SecCmsAlgArrayGetIndexByAlgTag(sigd->digestAlgorithms, digestalgtag);
 901
 902     /* if not found, add a digest */
 903     if (n < 0) {
 904         if (SecCmsSignedDataAddDigest(poolp, sigd, digestalgtag, digest) != SECSuccess)
 905             goto loser;
 906     } else {
 907         /* replace NULL pointer with digest item (and leak previous value) */
 908         sigd->digests[n] = digest;
 909     }
 910
 911     PORT_ArenaUnmark(poolp, mark);
 912     return SECSuccess;
 913
 914 loser:
 915     PORT_ArenaRelease(poolp, mark);
 916     return SECFailure;
 917 }
 918
 919 OSStatus
 920 SecCmsSignedDataAddDigest(PRArenaPool *poolp,
 921                                 SecCmsSignedDataRef sigd,
 922                                 SECOidTag digestalgtag,
 923                                 SecAsn1Item * digest)
 924 {
 925     SECAlgorithmID *digestalg;
 926     void *mark;
 927
 928     mark = PORT_ArenaMark(poolp);
 929
 930     digestalg = PORT_ArenaZAlloc(poolp, sizeof(SECAlgorithmID));
 931     if (digestalg == NULL)
 932         goto loser;
 933
 934     if (SECOID_SetAlgorithmID (poolp, digestalg, digestalgtag, NULL) != SECSuccess) /* no params */
 935         goto loser;
 936
 937     if (SecCmsArrayAdd(poolp, (void ***)&(sigd->digestAlgorithms), (void *)digestalg) != SECSuccess ||
 938         /* even if digest is NULL, add dummy to have same-size array */
 939         SecCmsArrayAdd(poolp, (void ***)&(sigd->digests), (void *)digest) != SECSuccess)
 940     {
 941         goto loser;
 942     }
 943
 944     PORT_ArenaUnmark(poolp, mark);
 945     return SECSuccess;
 946
 947 loser:
 948     PORT_ArenaRelease(poolp, mark);
 949     return SECFailure;
 950 }
 951
 952 SecAsn1Item *
 953 SecCmsSignedDataGetDigestValue(SecCmsSignedDataRef sigd, SECOidTag digestalgtag)
 954 {
 955     int n;
 956
 957     if (sigd->digestAlgorithms == NULL)
 958         return NULL;
 959
 960     n = SecCmsAlgArrayGetIndexByAlgTag(sigd->digestAlgorithms, digestalgtag);
 961
 962     return (n < 0) ? NULL : sigd->digests[n];
 963 }
 964
 965 /* =============================================================================
 966  * Misc. utility functions
 967  */
 968
 969 /*
 970  * SecCmsSignedDataCreateCertsOnly - create a certs-only SignedData.
 971  *
 972  * cert          - base certificates that will be included
 973  * include_chain - if true, include the complete cert chain for cert
 974  *
 975  * More certs and chains can be added via AddCertificate and AddCertChain.
 976  *
 977  * An error results in a return value of NULL and an error set.
 978  *
 979  * XXXX CRLs
 980  */
 981 SecCmsSignedDataRef
 982 SecCmsSignedDataCreateCertsOnly(SecCmsMessageRef cmsg, SecCertificateRef cert, Boolean include_chain)
 983 {
 984     SecCmsSignedDataRef sigd;
 985     void *mark;
 986     PLArenaPool *poolp;
 987     OSStatus rv;
 988
 989     poolp = cmsg->poolp;
 990     mark = PORT_ArenaMark(poolp);
 991
 992     sigd = SecCmsSignedDataCreate(cmsg);
 993     if (sigd == NULL)
 994         goto loser;
 995
 996     /* no signerinfos, thus no digestAlgorithms */
 997
 998     /* but certs */
 999     if (include_chain) {
1000         rv = SecCmsSignedDataAddCertChain(sigd, cert);
1001     } else {
1002         rv = SecCmsSignedDataAddCertificate(sigd, cert);
1003     }
1004     if (rv != SECSuccess)
1005         goto loser;
1006
1007     /* RFC2630 5.2 sez:
1008      * In the degenerate case where there are no signers, the
1009      * EncapsulatedContentInfo value being "signed" is irrelevant.  In this
1010      * case, the content type within the EncapsulatedContentInfo value being
1011      * "signed" should be id-data (as defined in section 4), and the content
1012      * field of the EncapsulatedContentInfo value should be omitted.
1013      */
1014     rv = SecCmsContentInfoSetContentData(&(sigd->contentInfo), NULL, PR_TRUE);
1015     if (rv != SECSuccess)
1016         goto loser;
1017
1018     PORT_ArenaUnmark(poolp, mark);
1019     return sigd;
1020
1021 loser:
1022     if (sigd)
1023         SecCmsSignedDataDestroy(sigd);
1024     PORT_ArenaRelease(poolp, mark);
1025     return NULL;
1026 }
1027
1028 /* TODO:
1029  * SecCmsSignerInfoGetReceiptRequest()
1030  * SecCmsSignedDataHasReceiptRequest()
1031  * easy way to iterate over signers
1032  */
1033