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/x509.h" 20 #include "cms_local.h" 21 22 IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest) 23 24 /* ESS services */ 25 26 int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr) 27 { 28 ASN1_STRING *str; 29 CMS_ReceiptRequest *rr; 30 ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_receiptRequest); 31 32 if (prr != NULL) 33 *prr = NULL; 34 str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE); 35 if (str == NULL) 36 return 0; 37 38 rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest)); 39 if (rr == NULL) 40 return -1; 41 if (prr != NULL) 42 *prr = rr; 43 else 44 CMS_ReceiptRequest_free(rr); 45 return 1; 46 } 47 48 /* 49 * Returns 0 if attribute is not found, 1 if found, 50 * or -1 on attribute parsing failure. 51 */ 52 static int ossl_cms_signerinfo_get_signing_cert(const CMS_SignerInfo *si, 53 ESS_SIGNING_CERT **psc) 54 { 55 ASN1_STRING *str; 56 ESS_SIGNING_CERT *sc; 57 ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificate); 58 59 if (psc != NULL) 60 *psc = NULL; 61 str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE); 62 if (str == NULL) 63 return 0; 64 65 sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT)); 66 if (sc == NULL) 67 return -1; 68 if (psc != NULL) 69 *psc = sc; 70 else 71 ESS_SIGNING_CERT_free(sc); 72 return 1; 73 } 74 75 /* 76 * Returns 0 if attribute is not found, 1 if found, 77 * or -1 on attribute parsing failure. 78 */ 79 static int ossl_cms_signerinfo_get_signing_cert_v2(const CMS_SignerInfo *si, 80 ESS_SIGNING_CERT_V2 **psc) 81 { 82 ASN1_STRING *str; 83 ESS_SIGNING_CERT_V2 *sc; 84 ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificateV2); 85 86 if (psc != NULL) 87 *psc = NULL; 88 str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE); 89 if (str == NULL) 90 return 0; 91 92 sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT_V2)); 93 if (sc == NULL) 94 return -1; 95 if (psc != NULL) 96 *psc = sc; 97 else 98 ESS_SIGNING_CERT_V2_free(sc); 99 return 1; 100 } 101 102 int ossl_cms_check_signing_certs(const CMS_SignerInfo *si, 103 const STACK_OF(X509) *chain) 104 { 105 ESS_SIGNING_CERT *ss = NULL; 106 ESS_SIGNING_CERT_V2 *ssv2 = NULL; 107 int ret = ossl_cms_signerinfo_get_signing_cert(si, &ss) >= 0 108 && ossl_cms_signerinfo_get_signing_cert_v2(si, &ssv2) >= 0 109 && OSSL_ESS_check_signing_certs(ss, ssv2, chain, 1) > 0; 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) 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, 132 0) <= 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 ERR_raise(ERR_LIB_CMS, 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); 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 ERR_raise(ERR_LIB_CMS, 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 (!ossl_asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md, 224 si->signedAttrs, dig, diglen, 225 ossl_cms_ctx_get0_libctx(si->cms_ctx), 226 ossl_cms_ctx_get0_propq(si->cms_ctx))) 227 return 0; 228 return 1; 229 } 230 231 /* Add a msgSigDigest attribute to a SignerInfo */ 232 233 int ossl_cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src) 234 { 235 unsigned char dig[EVP_MAX_MD_SIZE]; 236 unsigned int diglen; 237 238 if (!cms_msgSigDigest(src, dig, &diglen)) { 239 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR); 240 return 0; 241 } 242 if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest, 243 V_ASN1_OCTET_STRING, dig, diglen)) { 244 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE); 245 return 0; 246 } 247 return 1; 248 } 249 250 /* Verify signed receipt after it has already passed normal CMS verify */ 251 252 int ossl_cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms) 253 { 254 int r = 0, i; 255 CMS_ReceiptRequest *rr = NULL; 256 CMS_Receipt *rct = NULL; 257 STACK_OF(CMS_SignerInfo) *sis, *osis; 258 CMS_SignerInfo *si, *osi = NULL; 259 ASN1_OCTET_STRING *msig, **pcont; 260 ASN1_OBJECT *octype; 261 unsigned char dig[EVP_MAX_MD_SIZE]; 262 unsigned int diglen; 263 264 /* Get SignerInfos, also checks SignedData content type */ 265 osis = CMS_get0_SignerInfos(req_cms); 266 sis = CMS_get0_SignerInfos(cms); 267 if (!osis || !sis) 268 goto err; 269 270 if (sk_CMS_SignerInfo_num(sis) != 1) { 271 ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER); 272 goto err; 273 } 274 275 /* Check receipt content type */ 276 if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) { 277 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT); 278 goto err; 279 } 280 281 /* Extract and decode receipt content */ 282 pcont = CMS_get0_content(cms); 283 if (pcont == NULL || *pcont == NULL) { 284 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT); 285 goto err; 286 } 287 288 rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt)); 289 290 if (!rct) { 291 ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR); 292 goto err; 293 } 294 295 /* Locate original request */ 296 297 for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) { 298 osi = sk_CMS_SignerInfo_value(osis, i); 299 if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue)) 300 break; 301 } 302 303 if (i == sk_CMS_SignerInfo_num(osis)) { 304 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE); 305 goto err; 306 } 307 308 si = sk_CMS_SignerInfo_value(sis, 0); 309 310 /* Get msgSigDigest value and compare */ 311 312 msig = CMS_signed_get0_data_by_OBJ(si, 313 OBJ_nid2obj 314 (NID_id_smime_aa_msgSigDigest), -3, 315 V_ASN1_OCTET_STRING); 316 317 if (!msig) { 318 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MSGSIGDIGEST); 319 goto err; 320 } 321 322 if (!cms_msgSigDigest(osi, dig, &diglen)) { 323 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR); 324 goto err; 325 } 326 327 if (diglen != (unsigned int)msig->length) { 328 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_WRONG_LENGTH); 329 goto err; 330 } 331 332 if (memcmp(dig, msig->data, diglen)) { 333 ERR_raise(ERR_LIB_CMS, 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 ERR_raise(ERR_LIB_CMS, 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 ERR_raise(ERR_LIB_CMS, 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 ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST); 358 goto err; 359 } 360 361 if (ASN1_STRING_cmp(rr->signedContentIdentifier, 362 rct->signedContentIdentifier)) { 363 ERR_raise(ERR_LIB_CMS, 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 *ossl_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 ERR_raise(ERR_LIB_CMS, 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 ERR_raise(ERR_LIB_CMS, 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