1 /* $OpenBSD: cms_ess.c,v 1.21 2019/08/11 14:19:09 jsing Exp $ */ 2 /* 3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 4 * project. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 2008 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 */ 54 55 #include <string.h> 56 57 #include "cryptlib.h" 58 #include <openssl/asn1t.h> 59 #include <openssl/pem.h> 60 #include <openssl/rand.h> 61 #include <openssl/x509v3.h> 62 #include <openssl/err.h> 63 #include <openssl/cms.h> 64 #include "cms_lcl.h" 65 66 67 CMS_ReceiptRequest * 68 d2i_CMS_ReceiptRequest(CMS_ReceiptRequest **a, const unsigned char **in, long len) 69 { 70 return (CMS_ReceiptRequest *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, 71 &CMS_ReceiptRequest_it); 72 } 73 74 int 75 i2d_CMS_ReceiptRequest(CMS_ReceiptRequest *a, unsigned char **out) 76 { 77 return ASN1_item_i2d((ASN1_VALUE *)a, out, &CMS_ReceiptRequest_it); 78 } 79 80 CMS_ReceiptRequest * 81 CMS_ReceiptRequest_new(void) 82 { 83 return (CMS_ReceiptRequest *)ASN1_item_new(&CMS_ReceiptRequest_it); 84 } 85 86 void 87 CMS_ReceiptRequest_free(CMS_ReceiptRequest *a) 88 { 89 ASN1_item_free((ASN1_VALUE *)a, &CMS_ReceiptRequest_it); 90 } 91 92 /* ESS services: for now just Signed Receipt related */ 93 94 int 95 CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr) 96 { 97 ASN1_STRING *str; 98 CMS_ReceiptRequest *rr = NULL; 99 100 if (prr) 101 *prr = NULL; 102 str = CMS_signed_get0_data_by_OBJ(si, 103 OBJ_nid2obj(NID_id_smime_aa_receiptRequest), -3, V_ASN1_SEQUENCE); 104 if (!str) 105 return 0; 106 107 rr = ASN1_item_unpack(str, &CMS_ReceiptRequest_it); 108 if (!rr) 109 return -1; 110 if (prr) 111 *prr = rr; 112 else 113 CMS_ReceiptRequest_free(rr); 114 115 return 1; 116 } 117 118 CMS_ReceiptRequest * 119 CMS_ReceiptRequest_create0(unsigned char *id, int idlen, int allorfirst, 120 STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo) 121 { 122 CMS_ReceiptRequest *rr = NULL; 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 arc4random_buf(rr->signedContentIdentifier->data, 32); 133 } 134 135 sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free); 136 rr->receiptsTo = receiptsTo; 137 138 if (receiptList) { 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 CMSerror(ERR_R_MALLOC_FAILURE); 150 CMS_ReceiptRequest_free(rr); 151 152 return NULL; 153 } 154 155 int 156 CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr) 157 { 158 unsigned char *rrder = NULL; 159 int rrderlen, r = 0; 160 161 rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder); 162 if (rrderlen < 0) 163 goto merr; 164 165 if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest, 166 V_ASN1_SEQUENCE, rrder, rrderlen)) 167 goto merr; 168 169 r = 1; 170 171 merr: 172 if (!r) 173 CMSerror(ERR_R_MALLOC_FAILURE); 174 175 free(rrder); 176 177 return r; 178 } 179 180 void 181 CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr, ASN1_STRING **pcid, 182 int *pallorfirst, STACK_OF(GENERAL_NAMES) **plist, 183 STACK_OF(GENERAL_NAMES) **prto) 184 { 185 if (pcid) 186 *pcid = rr->signedContentIdentifier; 187 if (rr->receiptsFrom->type == 0) { 188 if (pallorfirst) 189 *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier; 190 if (plist) 191 *plist = NULL; 192 } else { 193 if (pallorfirst) 194 *pallorfirst = -1; 195 if (plist) 196 *plist = rr->receiptsFrom->d.receiptList; 197 } 198 if (prto) 199 *prto = rr->receiptsTo; 200 } 201 202 /* Digest a SignerInfo structure for msgSigDigest attribute processing */ 203 204 static int 205 cms_msgSigDigest(CMS_SignerInfo *si, unsigned char *dig, unsigned int *diglen) 206 { 207 const EVP_MD *md; 208 209 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm); 210 if (md == NULL) 211 return 0; 212 if (!ASN1_item_digest(&CMS_Attributes_Verify_it, md, 213 si->signedAttrs, dig, diglen)) 214 return 0; 215 216 return 1; 217 } 218 219 /* Add a msgSigDigest attribute to a SignerInfo */ 220 221 int 222 cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src) 223 { 224 unsigned char dig[EVP_MAX_MD_SIZE]; 225 unsigned int diglen; 226 227 if (!cms_msgSigDigest(src, dig, &diglen)) { 228 CMSerror(CMS_R_MSGSIGDIGEST_ERROR); 229 return 0; 230 } 231 if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest, 232 V_ASN1_OCTET_STRING, dig, diglen)) { 233 CMSerror(ERR_R_MALLOC_FAILURE); 234 return 0; 235 } 236 237 return 1; 238 } 239 240 /* Verify signed receipt after it has already passed normal CMS verify */ 241 242 int 243 cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms) 244 { 245 int r = 0, i; 246 CMS_ReceiptRequest *rr = NULL; 247 CMS_Receipt *rct = NULL; 248 STACK_OF(CMS_SignerInfo) *sis, *osis; 249 CMS_SignerInfo *si, *osi = NULL; 250 ASN1_OCTET_STRING *msig, **pcont; 251 ASN1_OBJECT *octype; 252 unsigned char dig[EVP_MAX_MD_SIZE]; 253 unsigned int diglen; 254 255 /* Get SignerInfos, also checks SignedData content type */ 256 osis = CMS_get0_SignerInfos(req_cms); 257 sis = CMS_get0_SignerInfos(cms); 258 if (!osis || !sis) 259 goto err; 260 261 if (sk_CMS_SignerInfo_num(sis) != 1) { 262 CMSerror(CMS_R_NEED_ONE_SIGNER); 263 goto err; 264 } 265 266 /* Check receipt content type */ 267 if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) { 268 CMSerror(CMS_R_NOT_A_SIGNED_RECEIPT); 269 goto err; 270 } 271 272 /* Extract and decode receipt content */ 273 pcont = CMS_get0_content(cms); 274 if (!pcont || !*pcont) { 275 CMSerror(CMS_R_NO_CONTENT); 276 goto err; 277 } 278 279 rct = ASN1_item_unpack(*pcont, &CMS_Receipt_it); 280 281 if (!rct) { 282 CMSerror(CMS_R_RECEIPT_DECODE_ERROR); 283 goto err; 284 } 285 286 /* Locate original request */ 287 288 for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) { 289 osi = sk_CMS_SignerInfo_value(osis, i); 290 if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue)) 291 break; 292 } 293 294 if (i == sk_CMS_SignerInfo_num(osis)) { 295 CMSerror(CMS_R_NO_MATCHING_SIGNATURE); 296 goto err; 297 } 298 299 si = sk_CMS_SignerInfo_value(sis, 0); 300 301 /* Get msgSigDigest value and compare */ 302 303 msig = CMS_signed_get0_data_by_OBJ(si, 304 OBJ_nid2obj(NID_id_smime_aa_msgSigDigest), -3, V_ASN1_OCTET_STRING); 305 306 if (!msig) { 307 CMSerror(CMS_R_NO_MSGSIGDIGEST); 308 goto err; 309 } 310 311 if (!cms_msgSigDigest(osi, dig, &diglen)) { 312 CMSerror(CMS_R_MSGSIGDIGEST_ERROR); 313 goto err; 314 } 315 316 if (diglen != (unsigned int)msig->length) { 317 CMSerror(CMS_R_MSGSIGDIGEST_WRONG_LENGTH); 318 goto err; 319 } 320 321 if (memcmp(dig, msig->data, diglen)) { 322 CMSerror(CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE); 323 goto err; 324 } 325 326 /* Compare content types */ 327 328 octype = CMS_signed_get0_data_by_OBJ(osi, 329 OBJ_nid2obj(NID_pkcs9_contentType), -3, V_ASN1_OBJECT); 330 if (!octype) { 331 CMSerror(CMS_R_NO_CONTENT_TYPE); 332 goto err; 333 } 334 335 /* Compare details in receipt request */ 336 337 if (OBJ_cmp(octype, rct->contentType)) { 338 CMSerror(CMS_R_CONTENT_TYPE_MISMATCH); 339 goto err; 340 } 341 342 /* Get original receipt request details */ 343 344 if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) { 345 CMSerror(CMS_R_NO_RECEIPT_REQUEST); 346 goto err; 347 } 348 349 if (ASN1_STRING_cmp(rr->signedContentIdentifier, 350 rct->signedContentIdentifier)) { 351 CMSerror(CMS_R_CONTENTIDENTIFIER_MISMATCH); 352 goto err; 353 } 354 355 r = 1; 356 357 err: 358 CMS_ReceiptRequest_free(rr); 359 ASN1_item_free((ASN1_VALUE *)rct, &CMS_Receipt_it); 360 return r; 361 } 362 363 /* 364 * Encode a Receipt into an OCTET STRING read for including into content of a 365 * SignedData ContentInfo. 366 */ 367 368 ASN1_OCTET_STRING * 369 cms_encode_Receipt(CMS_SignerInfo *si) 370 { 371 CMS_Receipt rct; 372 CMS_ReceiptRequest *rr = NULL; 373 ASN1_OBJECT *ctype; 374 ASN1_OCTET_STRING *os = NULL; 375 376 /* Get original receipt request */ 377 378 /* Get original receipt request details */ 379 380 if (CMS_get1_ReceiptRequest(si, &rr) <= 0) { 381 CMSerror(CMS_R_NO_RECEIPT_REQUEST); 382 goto err; 383 } 384 385 /* Get original content type */ 386 387 ctype = CMS_signed_get0_data_by_OBJ(si, 388 OBJ_nid2obj(NID_pkcs9_contentType), -3, V_ASN1_OBJECT); 389 if (!ctype) { 390 CMSerror(CMS_R_NO_CONTENT_TYPE); 391 goto err; 392 } 393 394 rct.version = 1; 395 rct.contentType = ctype; 396 rct.signedContentIdentifier = rr->signedContentIdentifier; 397 rct.originatorSignatureValue = si->signature; 398 399 os = ASN1_item_pack(&rct, &CMS_Receipt_it, NULL); 400 401 err: 402 CMS_ReceiptRequest_free(rr); 403 return os; 404 } 405