crypto/cms/cms_ess.c

   1 /*
   2  * Copyright 2008-2020 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 DEFINE_STACK_OF(ESS_CERT_ID)
  24 DEFINE_STACK_OF(ESS_CERT_ID_V2)
  25
  26 IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)
  27
  28 /* ESS services */
  29
  30 int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
  31 {
  32     ASN1_STRING *str;
  33     CMS_ReceiptRequest *rr;
  34     ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_receiptRequest);
  35
  36     if (prr != NULL)
  37         *prr = NULL;
  38     str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
  39     if (str == NULL)
  40         return 0;
  41
  42     rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
  43     if (rr == NULL)
  44         return -1;
  45     if (prr != NULL)
  46         *prr = rr;
  47     else
  48         CMS_ReceiptRequest_free(rr);
  49     return 1;
  50 }
  51
  52 /*
  53     First, get the ESS_SIGNING_CERT(V2) signed attribute from |si|.
  54     Then check matching of each cert of trust |chain| with one of
  55     the |cert_ids|(Hash+IssuerID) list from this ESS_SIGNING_CERT.
  56     Derived from ts_check_signing_certs()
  57 */
  58 int ess_check_signing_certs(CMS_SignerInfo *si, STACK_OF(X509) *chain)
  59 {
  60     ESS_SIGNING_CERT *ss = NULL;
  61     ESS_SIGNING_CERT_V2 *ssv2 = NULL;
  62     X509 *cert;
  63     int i = 0, ret = 0;
  64
  65     if (cms_signerinfo_get_signing_cert(si, &ss) > 0 && ss->cert_ids != NULL) {
  66         STACK_OF(ESS_CERT_ID) *cert_ids = ss->cert_ids;
  67
  68         cert = sk_X509_value(chain, 0);
  69         if (ess_find_cert(cert_ids, cert) != 0)
  70             goto err;
  71
  72         /*
  73          * Check the other certificates of the chain.
  74          * Fail if no signing certificate ids found for each certificate.
  75          */
  76         if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
  77             /* for each chain cert, try to find its cert id */
  78             for (i = 1; i < sk_X509_num(chain); ++i) {
  79                 cert = sk_X509_value(chain, i);
  80                 if (ess_find_cert(cert_ids, cert) < 0)
  81                     goto err;
  82             }
  83         }
  84     } else if (cms_signerinfo_get_signing_cert_v2(si, &ssv2) > 0
  85                    && ssv2->cert_ids!= NULL) {
  86         STACK_OF(ESS_CERT_ID_V2) *cert_ids_v2 = ssv2->cert_ids;
  87
  88         cert = sk_X509_value(chain, 0);
  89         if (ess_find_cert_v2(cert_ids_v2, cert) != 0)
  90             goto err;
  91
  92         /*
  93          * Check the other certificates of the chain.
  94          * Fail if no signing certificate ids found for each certificate.
  95          */
  96         if (sk_ESS_CERT_ID_V2_num(cert_ids_v2) > 1) {
  97             /* for each chain cert, try to find its cert id */
  98             for (i = 1; i < sk_X509_num(chain); ++i) {
  99                 cert = sk_X509_value(chain, i);
 100                 if (ess_find_cert_v2(cert_ids_v2, cert) < 0)
 101                     goto err;
 102             }
 103         }
 104     } else {
 105         CMSerr(CMS_F_ESS_CHECK_SIGNING_CERTS,
 106                CMS_R_ESS_NO_SIGNING_CERTID_ATTRIBUTE);
 107         return 0;
 108     }
 109     ret = 1;
 110  err:
 111     if (!ret)
 112         CMSerr(CMS_F_ESS_CHECK_SIGNING_CERTS,
 113                CMS_R_ESS_SIGNING_CERTID_MISMATCH_ERROR);
 114
 115     ESS_SIGNING_CERT_free(ss);
 116     ESS_SIGNING_CERT_V2_free(ssv2);
 117     return ret;
 118 }
 119
 120 CMS_ReceiptRequest *CMS_ReceiptRequest_create0_with_libctx(
 121     unsigned char *id, int idlen, int allorfirst,
 122     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo,
 123     OPENSSL_CTX *libctx, const char *propq)
 124 {
 125     CMS_ReceiptRequest *rr;
 126
 127     rr = CMS_ReceiptRequest_new();
 128     if (rr == NULL)
 129         goto merr;
 130     if (id)
 131         ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
 132     else {
 133         if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
 134             goto merr;
 135         if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32) <= 0)
 136             goto err;
 137     }
 138
 139     sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
 140     rr->receiptsTo = receiptsTo;
 141
 142     if (receiptList != NULL) {
 143         rr->receiptsFrom->type = 1;
 144         rr->receiptsFrom->d.receiptList = receiptList;
 145     } else {
 146         rr->receiptsFrom->type = 0;
 147         rr->receiptsFrom->d.allOrFirstTier = allorfirst;
 148     }
 149
 150     return rr;
 151
 152  merr:
 153     CMSerr(0, ERR_R_MALLOC_FAILURE);
 154
 155  err:
 156     CMS_ReceiptRequest_free(rr);
 157     return NULL;
 158
 159 }
 160
 161 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
 162     unsigned char *id, int idlen, int allorfirst,
 163     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
 164 {
 165     return CMS_ReceiptRequest_create0_with_libctx(id, idlen, allorfirst,
 166                                                   receiptList, receiptsTo,
 167                                                   NULL, NULL);
 168 }
 169
 170 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
 171 {
 172     unsigned char *rrder = NULL;
 173     int rrderlen, r = 0;
 174
 175     rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
 176     if (rrderlen < 0)
 177         goto merr;
 178
 179     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
 180                                      V_ASN1_SEQUENCE, rrder, rrderlen))
 181         goto merr;
 182
 183     r = 1;
 184
 185  merr:
 186     if (!r)
 187         CMSerr(CMS_F_CMS_ADD1_RECEIPTREQUEST, ERR_R_MALLOC_FAILURE);
 188
 189     OPENSSL_free(rrder);
 190
 191     return r;
 192
 193 }
 194
 195 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
 196                                     ASN1_STRING **pcid,
 197                                     int *pallorfirst,
 198                                     STACK_OF(GENERAL_NAMES) **plist,
 199                                     STACK_OF(GENERAL_NAMES) **prto)
 200 {
 201     if (pcid != NULL)
 202         *pcid = rr->signedContentIdentifier;
 203     if (rr->receiptsFrom->type == 0) {
 204         if (pallorfirst != NULL)
 205             *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
 206         if (plist != NULL)
 207             *plist = NULL;
 208     } else {
 209         if (pallorfirst != NULL)
 210             *pallorfirst = -1;
 211         if (plist != NULL)
 212             *plist = rr->receiptsFrom->d.receiptList;
 213     }
 214     if (prto != NULL)
 215         *prto = rr->receiptsTo;
 216 }
 217
 218 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
 219
 220 static int cms_msgSigDigest(CMS_SignerInfo *si,
 221                             unsigned char *dig, unsigned int *diglen)
 222 {
 223     const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 224
 225     if (md == NULL)
 226         return 0;
 227     if (!asn1_item_digest_with_libctx(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
 228                                       si->signedAttrs, dig, diglen,
 229                                       si->cms_ctx->libctx, si->cms_ctx->propq))
 230         return 0;
 231     return 1;
 232 }
 233
 234 /* Add a msgSigDigest attribute to a SignerInfo */
 235
 236 int cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
 237 {
 238     unsigned char dig[EVP_MAX_MD_SIZE];
 239     unsigned int diglen;
 240
 241     if (!cms_msgSigDigest(src, dig, &diglen)) {
 242         CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, CMS_R_MSGSIGDIGEST_ERROR);
 243         return 0;
 244     }
 245     if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
 246                                      V_ASN1_OCTET_STRING, dig, diglen)) {
 247         CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, ERR_R_MALLOC_FAILURE);
 248         return 0;
 249     }
 250     return 1;
 251 }
 252
 253 /* Verify signed receipt after it has already passed normal CMS verify */
 254
 255 int cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
 256 {
 257     int r = 0, i;
 258     CMS_ReceiptRequest *rr = NULL;
 259     CMS_Receipt *rct = NULL;
 260     STACK_OF(CMS_SignerInfo) *sis, *osis;
 261     CMS_SignerInfo *si, *osi = NULL;
 262     ASN1_OCTET_STRING *msig, **pcont;
 263     ASN1_OBJECT *octype;
 264     unsigned char dig[EVP_MAX_MD_SIZE];
 265     unsigned int diglen;
 266
 267     /* Get SignerInfos, also checks SignedData content type */
 268     osis = CMS_get0_SignerInfos(req_cms);
 269     sis = CMS_get0_SignerInfos(cms);
 270     if (!osis || !sis)
 271         goto err;
 272
 273     if (sk_CMS_SignerInfo_num(sis) != 1) {
 274         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NEED_ONE_SIGNER);
 275         goto err;
 276     }
 277
 278     /* Check receipt content type */
 279     if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
 280         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NOT_A_SIGNED_RECEIPT);
 281         goto err;
 282     }
 283
 284     /* Extract and decode receipt content */
 285     pcont = CMS_get0_content(cms);
 286     if (pcont == NULL || *pcont == NULL) {
 287         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT);
 288         goto err;
 289     }
 290
 291     rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
 292
 293     if (!rct) {
 294         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_RECEIPT_DECODE_ERROR);
 295         goto err;
 296     }
 297
 298     /* Locate original request */
 299
 300     for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
 301         osi = sk_CMS_SignerInfo_value(osis, i);
 302         if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
 303             break;
 304     }
 305
 306     if (i == sk_CMS_SignerInfo_num(osis)) {
 307         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MATCHING_SIGNATURE);
 308         goto err;
 309     }
 310
 311     si = sk_CMS_SignerInfo_value(sis, 0);
 312
 313     /* Get msgSigDigest value and compare */
 314
 315     msig = CMS_signed_get0_data_by_OBJ(si,
 316                                        OBJ_nid2obj
 317                                        (NID_id_smime_aa_msgSigDigest), -3,
 318                                        V_ASN1_OCTET_STRING);
 319
 320     if (!msig) {
 321         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MSGSIGDIGEST);
 322         goto err;
 323     }
 324
 325     if (!cms_msgSigDigest(osi, dig, &diglen)) {
 326         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_ERROR);
 327         goto err;
 328     }
 329
 330     if (diglen != (unsigned int)msig->length) {
 331         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
 332         goto err;
 333     }
 334
 335     if (memcmp(dig, msig->data, diglen)) {
 336         CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
 337                CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
 338         goto err;
 339     }
 340
 341     /* Compare content types */
 342
 343     octype = CMS_signed_get0_data_by_OBJ(osi,
 344                                          OBJ_nid2obj(NID_pkcs9_contentType),
 345                                          -3, V_ASN1_OBJECT);
 346     if (!octype) {
 347         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT_TYPE);
 348         goto err;
 349     }
 350
 351     /* Compare details in receipt request */
 352
 353     if (OBJ_cmp(octype, rct->contentType)) {
 354         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENT_TYPE_MISMATCH);
 355         goto err;
 356     }
 357
 358     /* Get original receipt request details */
 359
 360     if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
 361         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_RECEIPT_REQUEST);
 362         goto err;
 363     }
 364
 365     if (ASN1_STRING_cmp(rr->signedContentIdentifier,
 366                         rct->signedContentIdentifier)) {
 367         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENTIDENTIFIER_MISMATCH);
 368         goto err;
 369     }
 370
 371     r = 1;
 372
 373  err:
 374     CMS_ReceiptRequest_free(rr);
 375     M_ASN1_free_of(rct, CMS_Receipt);
 376     return r;
 377
 378 }
 379
 380 /*
 381  * Encode a Receipt into an OCTET STRING read for including into content of a
 382  * SignedData ContentInfo.
 383  */
 384
 385 ASN1_OCTET_STRING *cms_encode_Receipt(CMS_SignerInfo *si)
 386 {
 387     CMS_Receipt rct;
 388     CMS_ReceiptRequest *rr = NULL;
 389     ASN1_OBJECT *ctype;
 390     ASN1_OCTET_STRING *os = NULL;
 391
 392     /* Get original receipt request */
 393
 394     /* Get original receipt request details */
 395
 396     if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
 397         CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_RECEIPT_REQUEST);
 398         goto err;
 399     }
 400
 401     /* Get original content type */
 402
 403     ctype = CMS_signed_get0_data_by_OBJ(si,
 404                                         OBJ_nid2obj(NID_pkcs9_contentType),
 405                                         -3, V_ASN1_OBJECT);
 406     if (!ctype) {
 407         CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_CONTENT_TYPE);
 408         goto err;
 409     }
 410
 411     rct.version = 1;
 412     rct.contentType = ctype;
 413     rct.signedContentIdentifier = rr->signedContentIdentifier;
 414     rct.originatorSignatureValue = si->signature;
 415
 416     os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
 417
 418  err:
 419     CMS_ReceiptRequest_free(rr);
 420     return os;
 421 }
 422
 423 /*
 424  * Add signer certificate's V2 digest |sc| to a SignerInfo structure |si|
 425  */
 426
 427 int cms_add1_signing_cert_v2(CMS_SignerInfo *si, ESS_SIGNING_CERT_V2 *sc)
 428 {
 429     ASN1_STRING *seq = NULL;
 430     unsigned char *p, *pp = NULL;
 431     int len;
 432
 433     /* Add SigningCertificateV2 signed attribute to the signer info. */
 434     len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
 435     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 436         goto err;
 437     p = pp;
 438     i2d_ESS_SIGNING_CERT_V2(sc, &p);
 439     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 440         goto err;
 441     OPENSSL_free(pp);
 442     pp = NULL;
 443     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificateV2,
 444                                      V_ASN1_SEQUENCE, seq, -1))
 445         goto err;
 446     ASN1_STRING_free(seq);
 447     return 1;
 448  err:
 449     CMSerr(CMS_F_CMS_ADD1_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE);
 450     ASN1_STRING_free(seq);
 451     OPENSSL_free(pp);
 452     return 0;
 453 }
 454
 455 /*
 456  * Add signer certificate's digest |sc| to a SignerInfo structure |si|
 457  */
 458
 459 int cms_add1_signing_cert(CMS_SignerInfo *si, ESS_SIGNING_CERT *sc)
 460 {
 461     ASN1_STRING *seq = NULL;
 462     unsigned char *p, *pp = NULL;
 463     int len;
 464
 465     /* Add SigningCertificate signed attribute to the signer info. */
 466     len = i2d_ESS_SIGNING_CERT(sc, NULL);
 467     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 468         goto err;
 469     p = pp;
 470     i2d_ESS_SIGNING_CERT(sc, &p);
 471     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 472         goto err;
 473     OPENSSL_free(pp);
 474     pp = NULL;
 475     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificate,
 476                                      V_ASN1_SEQUENCE, seq, -1))
 477         goto err;
 478     ASN1_STRING_free(seq);
 479     return 1;
 480  err:
 481     CMSerr(CMS_F_CMS_ADD1_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 482     ASN1_STRING_free(seq);
 483     OPENSSL_free(pp);
 484     return 0;
 485 }