crypto/cms/cms_ess.c

   1 /*
   2  * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/cryptlib.h"
  11 #include <openssl/asn1t.h>
  12 #include <openssl/pem.h>
  13 #include <openssl/rand.h>
  14 #include <openssl/x509v3.h>
  15 #include <openssl/err.h>
  16 #include <openssl/cms.h>
  17 #include <openssl/ess.h>
  18 #include "crypto/ess.h"
  19 #include "crypto/cms.h"
  20 #include "crypto/x509.h"
  21 #include "cms_local.h"
  22
  23 IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)
  24
  25 /* ESS services */
  26
  27 int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
  28 {
  29     ASN1_STRING *str;
  30     CMS_ReceiptRequest *rr;
  31     ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_receiptRequest);
  32
  33     if (prr != NULL)
  34         *prr = NULL;
  35     str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
  36     if (str == NULL)
  37         return 0;
  38
  39     rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
  40     if (rr == NULL)
  41         return -1;
  42     if (prr != NULL)
  43         *prr = rr;
  44     else
  45         CMS_ReceiptRequest_free(rr);
  46     return 1;
  47 }
  48
  49 /*
  50     First, get the ESS_SIGNING_CERT(V2) signed attribute from |si|.
  51     Then check matching of each cert of trust |chain| with one of
  52     the |cert_ids|(Hash+IssuerID) list from this ESS_SIGNING_CERT.
  53     Derived from ts_check_signing_certs()
  54 */
  55 int ossl_ess_check_signing_certs(CMS_SignerInfo *si, STACK_OF(X509) *chain)
  56 {
  57     ESS_SIGNING_CERT *ss = NULL;
  58     ESS_SIGNING_CERT_V2 *ssv2 = NULL;
  59     X509 *cert;
  60     int i = 0, ret = 0;
  61
  62     if (ossl_cms_signerinfo_get_signing_cert(si, &ss) > 0
  63             && ss->cert_ids != NULL) {
  64         STACK_OF(ESS_CERT_ID) *cert_ids = ss->cert_ids;
  65
  66         cert = sk_X509_value(chain, 0);
  67         if (ossl_ess_find_cert(cert_ids, cert) != 0)
  68             goto err;
  69
  70         /*
  71          * Check the other certificates of the chain.
  72          * Fail if no signing certificate ids found for each certificate.
  73          */
  74         if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
  75             /* for each chain cert, try to find its cert id */
  76             for (i = 1; i < sk_X509_num(chain); ++i) {
  77                 cert = sk_X509_value(chain, i);
  78                 if (ossl_ess_find_cert(cert_ids, cert) < 0)
  79                     goto err;
  80             }
  81         }
  82     } else if (ossl_cms_signerinfo_get_signing_cert_v2(si, &ssv2) > 0
  83                    && ssv2->cert_ids!= NULL) {
  84         STACK_OF(ESS_CERT_ID_V2) *cert_ids_v2 = ssv2->cert_ids;
  85
  86         cert = sk_X509_value(chain, 0);
  87         if (ossl_ess_find_cert_v2(cert_ids_v2, cert) != 0)
  88             goto err;
  89
  90         /*
  91          * Check the other certificates of the chain.
  92          * Fail if no signing certificate ids found for each certificate.
  93          */
  94         if (sk_ESS_CERT_ID_V2_num(cert_ids_v2) > 1) {
  95             /* for each chain cert, try to find its cert id */
  96             for (i = 1; i < sk_X509_num(chain); ++i) {
  97                 cert = sk_X509_value(chain, i);
  98                 if (ossl_ess_find_cert_v2(cert_ids_v2, cert) < 0)
  99                     goto err;
 100             }
 101         }
 102     } else {
 103         ERR_raise(ERR_LIB_CMS, CMS_R_ESS_NO_SIGNING_CERTID_ATTRIBUTE);
 104         return 0;
 105     }
 106     ret = 1;
 107  err:
 108     if (!ret)
 109         ERR_raise(ERR_LIB_CMS, CMS_R_ESS_SIGNING_CERTID_MISMATCH_ERROR);
 110
 111     ESS_SIGNING_CERT_free(ss);
 112     ESS_SIGNING_CERT_V2_free(ssv2);
 113     return ret;
 114 }
 115
 116 CMS_ReceiptRequest *CMS_ReceiptRequest_create0_ex(
 117     unsigned char *id, int idlen, int allorfirst,
 118     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo,
 119     OSSL_LIB_CTX *libctx, const char *propq)
 120 {
 121     CMS_ReceiptRequest *rr;
 122
 123     rr = CMS_ReceiptRequest_new();
 124     if (rr == NULL)
 125         goto merr;
 126     if (id)
 127         ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
 128     else {
 129         if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
 130             goto merr;
 131         if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32) <= 0)
 132             goto err;
 133     }
 134
 135     sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
 136     rr->receiptsTo = receiptsTo;
 137
 138     if (receiptList != NULL) {
 139         rr->receiptsFrom->type = 1;
 140         rr->receiptsFrom->d.receiptList = receiptList;
 141     } else {
 142         rr->receiptsFrom->type = 0;
 143         rr->receiptsFrom->d.allOrFirstTier = allorfirst;
 144     }
 145
 146     return rr;
 147
 148  merr:
 149     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 150
 151  err:
 152     CMS_ReceiptRequest_free(rr);
 153     return NULL;
 154
 155 }
 156
 157 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
 158     unsigned char *id, int idlen, int allorfirst,
 159     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
 160 {
 161     return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
 162                                          receiptsTo, NULL, NULL);
 163 }
 164
 165 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
 166 {
 167     unsigned char *rrder = NULL;
 168     int rrderlen, r = 0;
 169
 170     rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
 171     if (rrderlen < 0)
 172         goto merr;
 173
 174     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
 175                                      V_ASN1_SEQUENCE, rrder, rrderlen))
 176         goto merr;
 177
 178     r = 1;
 179
 180  merr:
 181     if (!r)
 182         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 183
 184     OPENSSL_free(rrder);
 185
 186     return r;
 187
 188 }
 189
 190 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
 191                                     ASN1_STRING **pcid,
 192                                     int *pallorfirst,
 193                                     STACK_OF(GENERAL_NAMES) **plist,
 194                                     STACK_OF(GENERAL_NAMES) **prto)
 195 {
 196     if (pcid != NULL)
 197         *pcid = rr->signedContentIdentifier;
 198     if (rr->receiptsFrom->type == 0) {
 199         if (pallorfirst != NULL)
 200             *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
 201         if (plist != NULL)
 202             *plist = NULL;
 203     } else {
 204         if (pallorfirst != NULL)
 205             *pallorfirst = -1;
 206         if (plist != NULL)
 207             *plist = rr->receiptsFrom->d.receiptList;
 208     }
 209     if (prto != NULL)
 210         *prto = rr->receiptsTo;
 211 }
 212
 213 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
 214
 215 static int cms_msgSigDigest(CMS_SignerInfo *si,
 216                             unsigned char *dig, unsigned int *diglen)
 217 {
 218     const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 219
 220     if (md == NULL)
 221         return 0;
 222     if (!asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
 223                              si->signedAttrs, dig, diglen,
 224                              ossl_cms_ctx_get0_libctx(si->cms_ctx),
 225                              ossl_cms_ctx_get0_propq(si->cms_ctx)))
 226         return 0;
 227     return 1;
 228 }
 229
 230 /* Add a msgSigDigest attribute to a SignerInfo */
 231
 232 int ossl_cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
 233 {
 234     unsigned char dig[EVP_MAX_MD_SIZE];
 235     unsigned int diglen;
 236
 237     if (!cms_msgSigDigest(src, dig, &diglen)) {
 238         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
 239         return 0;
 240     }
 241     if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
 242                                      V_ASN1_OCTET_STRING, dig, diglen)) {
 243         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 244         return 0;
 245     }
 246     return 1;
 247 }
 248
 249 /* Verify signed receipt after it has already passed normal CMS verify */
 250
 251 int ossl_cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
 252 {
 253     int r = 0, i;
 254     CMS_ReceiptRequest *rr = NULL;
 255     CMS_Receipt *rct = NULL;
 256     STACK_OF(CMS_SignerInfo) *sis, *osis;
 257     CMS_SignerInfo *si, *osi = NULL;
 258     ASN1_OCTET_STRING *msig, **pcont;
 259     ASN1_OBJECT *octype;
 260     unsigned char dig[EVP_MAX_MD_SIZE];
 261     unsigned int diglen;
 262
 263     /* Get SignerInfos, also checks SignedData content type */
 264     osis = CMS_get0_SignerInfos(req_cms);
 265     sis = CMS_get0_SignerInfos(cms);
 266     if (!osis || !sis)
 267         goto err;
 268
 269     if (sk_CMS_SignerInfo_num(sis) != 1) {
 270         ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER);
 271         goto err;
 272     }
 273
 274     /* Check receipt content type */
 275     if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
 276         ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT);
 277         goto err;
 278     }
 279
 280     /* Extract and decode receipt content */
 281     pcont = CMS_get0_content(cms);
 282     if (pcont == NULL || *pcont == NULL) {
 283         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
 284         goto err;
 285     }
 286
 287     rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
 288
 289     if (!rct) {
 290         ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR);
 291         goto err;
 292     }
 293
 294     /* Locate original request */
 295
 296     for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
 297         osi = sk_CMS_SignerInfo_value(osis, i);
 298         if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
 299             break;
 300     }
 301
 302     if (i == sk_CMS_SignerInfo_num(osis)) {
 303         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE);
 304         goto err;
 305     }
 306
 307     si = sk_CMS_SignerInfo_value(sis, 0);
 308
 309     /* Get msgSigDigest value and compare */
 310
 311     msig = CMS_signed_get0_data_by_OBJ(si,
 312                                        OBJ_nid2obj
 313                                        (NID_id_smime_aa_msgSigDigest), -3,
 314                                        V_ASN1_OCTET_STRING);
 315
 316     if (!msig) {
 317         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MSGSIGDIGEST);
 318         goto err;
 319     }
 320
 321     if (!cms_msgSigDigest(osi, dig, &diglen)) {
 322         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
 323         goto err;
 324     }
 325
 326     if (diglen != (unsigned int)msig->length) {
 327         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
 328         goto err;
 329     }
 330
 331     if (memcmp(dig, msig->data, diglen)) {
 332         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
 333         goto err;
 334     }
 335
 336     /* Compare content types */
 337
 338     octype = CMS_signed_get0_data_by_OBJ(osi,
 339                                          OBJ_nid2obj(NID_pkcs9_contentType),
 340                                          -3, V_ASN1_OBJECT);
 341     if (!octype) {
 342         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
 343         goto err;
 344     }
 345
 346     /* Compare details in receipt request */
 347
 348     if (OBJ_cmp(octype, rct->contentType)) {
 349         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_MISMATCH);
 350         goto err;
 351     }
 352
 353     /* Get original receipt request details */
 354
 355     if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
 356         ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
 357         goto err;
 358     }
 359
 360     if (ASN1_STRING_cmp(rr->signedContentIdentifier,
 361                         rct->signedContentIdentifier)) {
 362         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENTIDENTIFIER_MISMATCH);
 363         goto err;
 364     }
 365
 366     r = 1;
 367
 368  err:
 369     CMS_ReceiptRequest_free(rr);
 370     M_ASN1_free_of(rct, CMS_Receipt);
 371     return r;
 372
 373 }
 374
 375 /*
 376  * Encode a Receipt into an OCTET STRING read for including into content of a
 377  * SignedData ContentInfo.
 378  */
 379
 380 ASN1_OCTET_STRING *ossl_cms_encode_Receipt(CMS_SignerInfo *si)
 381 {
 382     CMS_Receipt rct;
 383     CMS_ReceiptRequest *rr = NULL;
 384     ASN1_OBJECT *ctype;
 385     ASN1_OCTET_STRING *os = NULL;
 386
 387     /* Get original receipt request */
 388
 389     /* Get original receipt request details */
 390
 391     if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
 392         ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
 393         goto err;
 394     }
 395
 396     /* Get original content type */
 397
 398     ctype = CMS_signed_get0_data_by_OBJ(si,
 399                                         OBJ_nid2obj(NID_pkcs9_contentType),
 400                                         -3, V_ASN1_OBJECT);
 401     if (!ctype) {
 402         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
 403         goto err;
 404     }
 405
 406     rct.version = 1;
 407     rct.contentType = ctype;
 408     rct.signedContentIdentifier = rr->signedContentIdentifier;
 409     rct.originatorSignatureValue = si->signature;
 410
 411     os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
 412
 413  err:
 414     CMS_ReceiptRequest_free(rr);
 415     return os;
 416 }
 417
 418 /*
 419  * Add signer certificate's V2 digest |sc| to a SignerInfo structure |si|
 420  */
 421
 422 int ossl_cms_add1_signing_cert_v2(CMS_SignerInfo *si, ESS_SIGNING_CERT_V2 *sc)
 423 {
 424     ASN1_STRING *seq = NULL;
 425     unsigned char *p, *pp = NULL;
 426     int len;
 427
 428     /* Add SigningCertificateV2 signed attribute to the signer info. */
 429     len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
 430     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 431         goto err;
 432     p = pp;
 433     i2d_ESS_SIGNING_CERT_V2(sc, &p);
 434     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 435         goto err;
 436     OPENSSL_free(pp);
 437     pp = NULL;
 438     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificateV2,
 439                                      V_ASN1_SEQUENCE, seq, -1))
 440         goto err;
 441     ASN1_STRING_free(seq);
 442     return 1;
 443  err:
 444     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 445     ASN1_STRING_free(seq);
 446     OPENSSL_free(pp);
 447     return 0;
 448 }
 449
 450 /*
 451  * Add signer certificate's digest |sc| to a SignerInfo structure |si|
 452  */
 453
 454 int ossl_cms_add1_signing_cert(CMS_SignerInfo *si, ESS_SIGNING_CERT *sc)
 455 {
 456     ASN1_STRING *seq = NULL;
 457     unsigned char *p, *pp = NULL;
 458     int len;
 459
 460     /* Add SigningCertificate signed attribute to the signer info. */
 461     len = i2d_ESS_SIGNING_CERT(sc, NULL);
 462     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 463         goto err;
 464     p = pp;
 465     i2d_ESS_SIGNING_CERT(sc, &p);
 466     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 467         goto err;
 468     OPENSSL_free(pp);
 469     pp = NULL;
 470     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificate,
 471                                      V_ASN1_SEQUENCE, seq, -1))
 472         goto err;
 473     ASN1_STRING_free(seq);
 474     return 1;
 475  err:
 476     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 477     ASN1_STRING_free(seq);
 478     OPENSSL_free(pp);
 479     return 0;
 480 }