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 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 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 (cms_signerinfo_get_signing_cert(si, &ss) > 0 && ss->cert_ids != NULL) {
  63         STACK_OF(ESS_CERT_ID) *cert_ids = ss->cert_ids;
  64
  65         cert = sk_X509_value(chain, 0);
  66         if (ess_find_cert(cert_ids, cert) != 0)
  67             goto err;
  68
  69         /*
  70          * Check the other certificates of the chain.
  71          * Fail if no signing certificate ids found for each certificate.
  72          */
  73         if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
  74             /* for each chain cert, try to find its cert id */
  75             for (i = 1; i < sk_X509_num(chain); ++i) {
  76                 cert = sk_X509_value(chain, i);
  77                 if (ess_find_cert(cert_ids, cert) < 0)
  78                     goto err;
  79             }
  80         }
  81     } else if (cms_signerinfo_get_signing_cert_v2(si, &ssv2) > 0
  82                    && ssv2->cert_ids!= NULL) {
  83         STACK_OF(ESS_CERT_ID_V2) *cert_ids_v2 = ssv2->cert_ids;
  84
  85         cert = sk_X509_value(chain, 0);
  86         if (ess_find_cert_v2(cert_ids_v2, cert) != 0)
  87             goto err;
  88
  89         /*
  90          * Check the other certificates of the chain.
  91          * Fail if no signing certificate ids found for each certificate.
  92          */
  93         if (sk_ESS_CERT_ID_V2_num(cert_ids_v2) > 1) {
  94             /* for each chain cert, try to find its cert id */
  95             for (i = 1; i < sk_X509_num(chain); ++i) {
  96                 cert = sk_X509_value(chain, i);
  97                 if (ess_find_cert_v2(cert_ids_v2, cert) < 0)
  98                     goto err;
  99             }
 100         }
 101     } else {
 102         CMSerr(CMS_F_ESS_CHECK_SIGNING_CERTS,
 103                CMS_R_ESS_NO_SIGNING_CERTID_ATTRIBUTE);
 104         return 0;
 105     }
 106     ret = 1;
 107  err:
 108     if (!ret)
 109         CMSerr(CMS_F_ESS_CHECK_SIGNING_CERTS,
 110                CMS_R_ESS_SIGNING_CERTID_MISMATCH_ERROR);
 111
 112     ESS_SIGNING_CERT_free(ss);
 113     ESS_SIGNING_CERT_V2_free(ssv2);
 114     return ret;
 115 }
 116
 117 CMS_ReceiptRequest *CMS_ReceiptRequest_create0_ex(
 118     unsigned char *id, int idlen, int allorfirst,
 119     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo,
 120     OSSL_LIB_CTX *libctx, const char *propq)
 121 {
 122     CMS_ReceiptRequest *rr;
 123
 124     rr = CMS_ReceiptRequest_new();
 125     if (rr == NULL)
 126         goto merr;
 127     if (id)
 128         ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
 129     else {
 130         if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
 131             goto merr;
 132         if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32) <= 0)
 133             goto err;
 134     }
 135
 136     sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
 137     rr->receiptsTo = receiptsTo;
 138
 139     if (receiptList != NULL) {
 140         rr->receiptsFrom->type = 1;
 141         rr->receiptsFrom->d.receiptList = receiptList;
 142     } else {
 143         rr->receiptsFrom->type = 0;
 144         rr->receiptsFrom->d.allOrFirstTier = allorfirst;
 145     }
 146
 147     return rr;
 148
 149  merr:
 150     CMSerr(0, ERR_R_MALLOC_FAILURE);
 151
 152  err:
 153     CMS_ReceiptRequest_free(rr);
 154     return NULL;
 155
 156 }
 157
 158 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
 159     unsigned char *id, int idlen, int allorfirst,
 160     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
 161 {
 162     return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
 163                                          receiptsTo, NULL, NULL);
 164 }
 165
 166 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
 167 {
 168     unsigned char *rrder = NULL;
 169     int rrderlen, r = 0;
 170
 171     rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
 172     if (rrderlen < 0)
 173         goto merr;
 174
 175     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
 176                                      V_ASN1_SEQUENCE, rrder, rrderlen))
 177         goto merr;
 178
 179     r = 1;
 180
 181  merr:
 182     if (!r)
 183         CMSerr(CMS_F_CMS_ADD1_RECEIPTREQUEST, ERR_R_MALLOC_FAILURE);
 184
 185     OPENSSL_free(rrder);
 186
 187     return r;
 188
 189 }
 190
 191 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
 192                                     ASN1_STRING **pcid,
 193                                     int *pallorfirst,
 194                                     STACK_OF(GENERAL_NAMES) **plist,
 195                                     STACK_OF(GENERAL_NAMES) **prto)
 196 {
 197     if (pcid != NULL)
 198         *pcid = rr->signedContentIdentifier;
 199     if (rr->receiptsFrom->type == 0) {
 200         if (pallorfirst != NULL)
 201             *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
 202         if (plist != NULL)
 203             *plist = NULL;
 204     } else {
 205         if (pallorfirst != NULL)
 206             *pallorfirst = -1;
 207         if (plist != NULL)
 208             *plist = rr->receiptsFrom->d.receiptList;
 209     }
 210     if (prto != NULL)
 211         *prto = rr->receiptsTo;
 212 }
 213
 214 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
 215
 216 static int cms_msgSigDigest(CMS_SignerInfo *si,
 217                             unsigned char *dig, unsigned int *diglen)
 218 {
 219     const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 220
 221     if (md == NULL)
 222         return 0;
 223     if (!asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
 224                              si->signedAttrs, dig, diglen, si->cms_ctx->libctx,
 225                              si->cms_ctx->propq))
 226         return 0;
 227     return 1;
 228 }
 229
 230 /* Add a msgSigDigest attribute to a SignerInfo */
 231
 232 int 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         CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, 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         CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, 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 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         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, 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         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, 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         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, 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         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, 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         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, 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         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MSGSIGDIGEST);
 318         goto err;
 319     }
 320
 321     if (!cms_msgSigDigest(osi, dig, &diglen)) {
 322         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_ERROR);
 323         goto err;
 324     }
 325
 326     if (diglen != (unsigned int)msig->length) {
 327         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
 328         goto err;
 329     }
 330
 331     if (memcmp(dig, msig->data, diglen)) {
 332         CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
 333                CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
 334         goto err;
 335     }
 336
 337     /* Compare content types */
 338
 339     octype = CMS_signed_get0_data_by_OBJ(osi,
 340                                          OBJ_nid2obj(NID_pkcs9_contentType),
 341                                          -3, V_ASN1_OBJECT);
 342     if (!octype) {
 343         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT_TYPE);
 344         goto err;
 345     }
 346
 347     /* Compare details in receipt request */
 348
 349     if (OBJ_cmp(octype, rct->contentType)) {
 350         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENT_TYPE_MISMATCH);
 351         goto err;
 352     }
 353
 354     /* Get original receipt request details */
 355
 356     if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
 357         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_RECEIPT_REQUEST);
 358         goto err;
 359     }
 360
 361     if (ASN1_STRING_cmp(rr->signedContentIdentifier,
 362                         rct->signedContentIdentifier)) {
 363         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENTIDENTIFIER_MISMATCH);
 364         goto err;
 365     }
 366
 367     r = 1;
 368
 369  err:
 370     CMS_ReceiptRequest_free(rr);
 371     M_ASN1_free_of(rct, CMS_Receipt);
 372     return r;
 373
 374 }
 375
 376 /*
 377  * Encode a Receipt into an OCTET STRING read for including into content of a
 378  * SignedData ContentInfo.
 379  */
 380
 381 ASN1_OCTET_STRING *cms_encode_Receipt(CMS_SignerInfo *si)
 382 {
 383     CMS_Receipt rct;
 384     CMS_ReceiptRequest *rr = NULL;
 385     ASN1_OBJECT *ctype;
 386     ASN1_OCTET_STRING *os = NULL;
 387
 388     /* Get original receipt request */
 389
 390     /* Get original receipt request details */
 391
 392     if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
 393         CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_RECEIPT_REQUEST);
 394         goto err;
 395     }
 396
 397     /* Get original content type */
 398
 399     ctype = CMS_signed_get0_data_by_OBJ(si,
 400                                         OBJ_nid2obj(NID_pkcs9_contentType),
 401                                         -3, V_ASN1_OBJECT);
 402     if (!ctype) {
 403         CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_CONTENT_TYPE);
 404         goto err;
 405     }
 406
 407     rct.version = 1;
 408     rct.contentType = ctype;
 409     rct.signedContentIdentifier = rr->signedContentIdentifier;
 410     rct.originatorSignatureValue = si->signature;
 411
 412     os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
 413
 414  err:
 415     CMS_ReceiptRequest_free(rr);
 416     return os;
 417 }
 418
 419 /*
 420  * Add signer certificate's V2 digest |sc| to a SignerInfo structure |si|
 421  */
 422
 423 int cms_add1_signing_cert_v2(CMS_SignerInfo *si, ESS_SIGNING_CERT_V2 *sc)
 424 {
 425     ASN1_STRING *seq = NULL;
 426     unsigned char *p, *pp = NULL;
 427     int len;
 428
 429     /* Add SigningCertificateV2 signed attribute to the signer info. */
 430     len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
 431     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 432         goto err;
 433     p = pp;
 434     i2d_ESS_SIGNING_CERT_V2(sc, &p);
 435     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 436         goto err;
 437     OPENSSL_free(pp);
 438     pp = NULL;
 439     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificateV2,
 440                                      V_ASN1_SEQUENCE, seq, -1))
 441         goto err;
 442     ASN1_STRING_free(seq);
 443     return 1;
 444  err:
 445     CMSerr(CMS_F_CMS_ADD1_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE);
 446     ASN1_STRING_free(seq);
 447     OPENSSL_free(pp);
 448     return 0;
 449 }
 450
 451 /*
 452  * Add signer certificate's digest |sc| to a SignerInfo structure |si|
 453  */
 454
 455 int cms_add1_signing_cert(CMS_SignerInfo *si, ESS_SIGNING_CERT *sc)
 456 {
 457     ASN1_STRING *seq = NULL;
 458     unsigned char *p, *pp = NULL;
 459     int len;
 460
 461     /* Add SigningCertificate signed attribute to the signer info. */
 462     len = i2d_ESS_SIGNING_CERT(sc, NULL);
 463     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 464         goto err;
 465     p = pp;
 466     i2d_ESS_SIGNING_CERT(sc, &p);
 467     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 468         goto err;
 469     OPENSSL_free(pp);
 470     pp = NULL;
 471     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificate,
 472                                      V_ASN1_SEQUENCE, seq, -1))
 473         goto err;
 474     ASN1_STRING_free(seq);
 475     return 1;
 476  err:
 477     CMSerr(CMS_F_CMS_ADD1_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 478     ASN1_STRING_free(seq);
 479     OPENSSL_free(pp);
 480     return 0;
 481 }