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 int ossl_cms_check_signing_certs(const CMS_SignerInfo *si,
  50                                  const STACK_OF(X509) *chain)
  51 {
  52     ESS_SIGNING_CERT *ss = NULL;
  53     ESS_SIGNING_CERT_V2 *ssv2 = NULL;
  54     int ret = ossl_cms_signerinfo_get_signing_cert(si, &ss) >= 0
  55         && ossl_cms_signerinfo_get_signing_cert_v2(si, &ssv2) >= 0
  56         && ossl_ess_check_signing_certs(ss, ssv2, chain, 1);
  57
  58     ESS_SIGNING_CERT_free(ss);
  59     ESS_SIGNING_CERT_V2_free(ssv2);
  60     return ret;
  61 }
  62
  63 CMS_ReceiptRequest *CMS_ReceiptRequest_create0_ex(
  64     unsigned char *id, int idlen, int allorfirst,
  65     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo,
  66     OSSL_LIB_CTX *libctx, const char *propq)
  67 {
  68     CMS_ReceiptRequest *rr;
  69
  70     rr = CMS_ReceiptRequest_new();
  71     if (rr == NULL)
  72         goto merr;
  73     if (id)
  74         ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
  75     else {
  76         if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
  77             goto merr;
  78         if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32) <= 0)
  79             goto err;
  80     }
  81
  82     sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
  83     rr->receiptsTo = receiptsTo;
  84
  85     if (receiptList != NULL) {
  86         rr->receiptsFrom->type = 1;
  87         rr->receiptsFrom->d.receiptList = receiptList;
  88     } else {
  89         rr->receiptsFrom->type = 0;
  90         rr->receiptsFrom->d.allOrFirstTier = allorfirst;
  91     }
  92
  93     return rr;
  94
  95  merr:
  96     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
  97
  98  err:
  99     CMS_ReceiptRequest_free(rr);
 100     return NULL;
 101
 102 }
 103
 104 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
 105     unsigned char *id, int idlen, int allorfirst,
 106     STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
 107 {
 108     return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
 109                                          receiptsTo, NULL, NULL);
 110 }
 111
 112 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
 113 {
 114     unsigned char *rrder = NULL;
 115     int rrderlen, r = 0;
 116
 117     rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
 118     if (rrderlen < 0)
 119         goto merr;
 120
 121     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
 122                                      V_ASN1_SEQUENCE, rrder, rrderlen))
 123         goto merr;
 124
 125     r = 1;
 126
 127  merr:
 128     if (!r)
 129         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 130
 131     OPENSSL_free(rrder);
 132
 133     return r;
 134
 135 }
 136
 137 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
 138                                     ASN1_STRING **pcid,
 139                                     int *pallorfirst,
 140                                     STACK_OF(GENERAL_NAMES) **plist,
 141                                     STACK_OF(GENERAL_NAMES) **prto)
 142 {
 143     if (pcid != NULL)
 144         *pcid = rr->signedContentIdentifier;
 145     if (rr->receiptsFrom->type == 0) {
 146         if (pallorfirst != NULL)
 147             *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
 148         if (plist != NULL)
 149             *plist = NULL;
 150     } else {
 151         if (pallorfirst != NULL)
 152             *pallorfirst = -1;
 153         if (plist != NULL)
 154             *plist = rr->receiptsFrom->d.receiptList;
 155     }
 156     if (prto != NULL)
 157         *prto = rr->receiptsTo;
 158 }
 159
 160 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
 161
 162 static int cms_msgSigDigest(CMS_SignerInfo *si,
 163                             unsigned char *dig, unsigned int *diglen)
 164 {
 165     const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 166
 167     if (md == NULL)
 168         return 0;
 169     if (!ossl_asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
 170                                   si->signedAttrs, dig, diglen,
 171                                   ossl_cms_ctx_get0_libctx(si->cms_ctx),
 172                                   ossl_cms_ctx_get0_propq(si->cms_ctx)))
 173         return 0;
 174     return 1;
 175 }
 176
 177 /* Add a msgSigDigest attribute to a SignerInfo */
 178
 179 int ossl_cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
 180 {
 181     unsigned char dig[EVP_MAX_MD_SIZE];
 182     unsigned int diglen;
 183
 184     if (!cms_msgSigDigest(src, dig, &diglen)) {
 185         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
 186         return 0;
 187     }
 188     if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
 189                                      V_ASN1_OCTET_STRING, dig, diglen)) {
 190         ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 191         return 0;
 192     }
 193     return 1;
 194 }
 195
 196 /* Verify signed receipt after it has already passed normal CMS verify */
 197
 198 int ossl_cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
 199 {
 200     int r = 0, i;
 201     CMS_ReceiptRequest *rr = NULL;
 202     CMS_Receipt *rct = NULL;
 203     STACK_OF(CMS_SignerInfo) *sis, *osis;
 204     CMS_SignerInfo *si, *osi = NULL;
 205     ASN1_OCTET_STRING *msig, **pcont;
 206     ASN1_OBJECT *octype;
 207     unsigned char dig[EVP_MAX_MD_SIZE];
 208     unsigned int diglen;
 209
 210     /* Get SignerInfos, also checks SignedData content type */
 211     osis = CMS_get0_SignerInfos(req_cms);
 212     sis = CMS_get0_SignerInfos(cms);
 213     if (!osis || !sis)
 214         goto err;
 215
 216     if (sk_CMS_SignerInfo_num(sis) != 1) {
 217         ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER);
 218         goto err;
 219     }
 220
 221     /* Check receipt content type */
 222     if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
 223         ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT);
 224         goto err;
 225     }
 226
 227     /* Extract and decode receipt content */
 228     pcont = CMS_get0_content(cms);
 229     if (pcont == NULL || *pcont == NULL) {
 230         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
 231         goto err;
 232     }
 233
 234     rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
 235
 236     if (!rct) {
 237         ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR);
 238         goto err;
 239     }
 240
 241     /* Locate original request */
 242
 243     for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
 244         osi = sk_CMS_SignerInfo_value(osis, i);
 245         if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
 246             break;
 247     }
 248
 249     if (i == sk_CMS_SignerInfo_num(osis)) {
 250         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE);
 251         goto err;
 252     }
 253
 254     si = sk_CMS_SignerInfo_value(sis, 0);
 255
 256     /* Get msgSigDigest value and compare */
 257
 258     msig = CMS_signed_get0_data_by_OBJ(si,
 259                                        OBJ_nid2obj
 260                                        (NID_id_smime_aa_msgSigDigest), -3,
 261                                        V_ASN1_OCTET_STRING);
 262
 263     if (!msig) {
 264         ERR_raise(ERR_LIB_CMS, CMS_R_NO_MSGSIGDIGEST);
 265         goto err;
 266     }
 267
 268     if (!cms_msgSigDigest(osi, dig, &diglen)) {
 269         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
 270         goto err;
 271     }
 272
 273     if (diglen != (unsigned int)msig->length) {
 274         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
 275         goto err;
 276     }
 277
 278     if (memcmp(dig, msig->data, diglen)) {
 279         ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
 280         goto err;
 281     }
 282
 283     /* Compare content types */
 284
 285     octype = CMS_signed_get0_data_by_OBJ(osi,
 286                                          OBJ_nid2obj(NID_pkcs9_contentType),
 287                                          -3, V_ASN1_OBJECT);
 288     if (!octype) {
 289         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
 290         goto err;
 291     }
 292
 293     /* Compare details in receipt request */
 294
 295     if (OBJ_cmp(octype, rct->contentType)) {
 296         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_MISMATCH);
 297         goto err;
 298     }
 299
 300     /* Get original receipt request details */
 301
 302     if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
 303         ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
 304         goto err;
 305     }
 306
 307     if (ASN1_STRING_cmp(rr->signedContentIdentifier,
 308                         rct->signedContentIdentifier)) {
 309         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENTIDENTIFIER_MISMATCH);
 310         goto err;
 311     }
 312
 313     r = 1;
 314
 315  err:
 316     CMS_ReceiptRequest_free(rr);
 317     M_ASN1_free_of(rct, CMS_Receipt);
 318     return r;
 319
 320 }
 321
 322 /*
 323  * Encode a Receipt into an OCTET STRING read for including into content of a
 324  * SignedData ContentInfo.
 325  */
 326
 327 ASN1_OCTET_STRING *ossl_cms_encode_Receipt(CMS_SignerInfo *si)
 328 {
 329     CMS_Receipt rct;
 330     CMS_ReceiptRequest *rr = NULL;
 331     ASN1_OBJECT *ctype;
 332     ASN1_OCTET_STRING *os = NULL;
 333
 334     /* Get original receipt request */
 335
 336     /* Get original receipt request details */
 337
 338     if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
 339         ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
 340         goto err;
 341     }
 342
 343     /* Get original content type */
 344
 345     ctype = CMS_signed_get0_data_by_OBJ(si,
 346                                         OBJ_nid2obj(NID_pkcs9_contentType),
 347                                         -3, V_ASN1_OBJECT);
 348     if (!ctype) {
 349         ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
 350         goto err;
 351     }
 352
 353     rct.version = 1;
 354     rct.contentType = ctype;
 355     rct.signedContentIdentifier = rr->signedContentIdentifier;
 356     rct.originatorSignatureValue = si->signature;
 357
 358     os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
 359
 360  err:
 361     CMS_ReceiptRequest_free(rr);
 362     return os;
 363 }
 364
 365 /*
 366  * Add signer certificate's V2 digest |sc| to a SignerInfo structure |si|
 367  */
 368
 369 int ossl_cms_add1_signing_cert_v2(CMS_SignerInfo *si, ESS_SIGNING_CERT_V2 *sc)
 370 {
 371     ASN1_STRING *seq = NULL;
 372     unsigned char *p, *pp = NULL;
 373     int len;
 374
 375     /* Add SigningCertificateV2 signed attribute to the signer info. */
 376     len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
 377     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 378         goto err;
 379     p = pp;
 380     i2d_ESS_SIGNING_CERT_V2(sc, &p);
 381     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 382         goto err;
 383     OPENSSL_free(pp);
 384     pp = NULL;
 385     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificateV2,
 386                                      V_ASN1_SEQUENCE, seq, -1))
 387         goto err;
 388     ASN1_STRING_free(seq);
 389     return 1;
 390  err:
 391     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 392     ASN1_STRING_free(seq);
 393     OPENSSL_free(pp);
 394     return 0;
 395 }
 396
 397 /*
 398  * Add signer certificate's digest |sc| to a SignerInfo structure |si|
 399  */
 400
 401 int ossl_cms_add1_signing_cert(CMS_SignerInfo *si, ESS_SIGNING_CERT *sc)
 402 {
 403     ASN1_STRING *seq = NULL;
 404     unsigned char *p, *pp = NULL;
 405     int len;
 406
 407     /* Add SigningCertificate signed attribute to the signer info. */
 408     len = i2d_ESS_SIGNING_CERT(sc, NULL);
 409     if (len <= 0 || (pp = OPENSSL_malloc(len)) == NULL)
 410         goto err;
 411     p = pp;
 412     i2d_ESS_SIGNING_CERT(sc, &p);
 413     if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 414         goto err;
 415     OPENSSL_free(pp);
 416     pp = NULL;
 417     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_signingCertificate,
 418                                      V_ASN1_SEQUENCE, seq, -1))
 419         goto err;
 420     ASN1_STRING_free(seq);
 421     return 1;
 422  err:
 423     ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
 424     ASN1_STRING_free(seq);
 425     OPENSSL_free(pp);
 426     return 0;
 427 }