crypto/cms/cms_ess.c

   1 /*
   2  * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 "cms_lcl.h"
  18
  19 IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)
  20
  21 /* ESS services: for now just Signed Receipt related */
  22
  23 int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
  24 {
  25     ASN1_STRING *str;
  26     CMS_ReceiptRequest *rr = NULL;
  27     if (prr)
  28         *prr = NULL;
  29     str = CMS_signed_get0_data_by_OBJ(si,
  30                                       OBJ_nid2obj
  31                                       (NID_id_smime_aa_receiptRequest), -3,
  32                                       V_ASN1_SEQUENCE);
  33     if (!str)
  34         return 0;
  35
  36     rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
  37     if (!rr)
  38         return -1;
  39     if (prr)
  40         *prr = rr;
  41     else
  42         CMS_ReceiptRequest_free(rr);
  43     return 1;
  44 }
  45
  46 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(unsigned char *id, int idlen,
  47                                                int allorfirst,
  48                                                STACK_OF(GENERAL_NAMES)
  49                                                *receiptList, STACK_OF(GENERAL_NAMES)
  50                                                *receiptsTo)
  51 {
  52     CMS_ReceiptRequest *rr = NULL;
  53
  54     rr = CMS_ReceiptRequest_new();
  55     if (rr == NULL)
  56         goto merr;
  57     if (id)
  58         ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
  59     else {
  60         if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
  61             goto merr;
  62         if (RAND_bytes(rr->signedContentIdentifier->data, 32) <= 0)
  63             goto err;
  64     }
  65
  66     sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
  67     rr->receiptsTo = receiptsTo;
  68
  69     if (receiptList) {
  70         rr->receiptsFrom->type = 1;
  71         rr->receiptsFrom->d.receiptList = receiptList;
  72     } else {
  73         rr->receiptsFrom->type = 0;
  74         rr->receiptsFrom->d.allOrFirstTier = allorfirst;
  75     }
  76
  77     return rr;
  78
  79  merr:
  80     CMSerr(CMS_F_CMS_RECEIPTREQUEST_CREATE0, ERR_R_MALLOC_FAILURE);
  81
  82  err:
  83     CMS_ReceiptRequest_free(rr);
  84     return NULL;
  85
  86 }
  87
  88 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
  89 {
  90     unsigned char *rrder = NULL;
  91     int rrderlen, r = 0;
  92
  93     rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
  94     if (rrderlen < 0)
  95         goto merr;
  96
  97     if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
  98                                      V_ASN1_SEQUENCE, rrder, rrderlen))
  99         goto merr;
 100
 101     r = 1;
 102
 103  merr:
 104     if (!r)
 105         CMSerr(CMS_F_CMS_ADD1_RECEIPTREQUEST, ERR_R_MALLOC_FAILURE);
 106
 107     OPENSSL_free(rrder);
 108
 109     return r;
 110
 111 }
 112
 113 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
 114                                     ASN1_STRING **pcid,
 115                                     int *pallorfirst,
 116                                     STACK_OF(GENERAL_NAMES) **plist,
 117                                     STACK_OF(GENERAL_NAMES) **prto)
 118 {
 119     if (pcid)
 120         *pcid = rr->signedContentIdentifier;
 121     if (rr->receiptsFrom->type == 0) {
 122         if (pallorfirst)
 123             *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
 124         if (plist)
 125             *plist = NULL;
 126     } else {
 127         if (pallorfirst)
 128             *pallorfirst = -1;
 129         if (plist)
 130             *plist = rr->receiptsFrom->d.receiptList;
 131     }
 132     if (prto)
 133         *prto = rr->receiptsTo;
 134 }
 135
 136 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
 137
 138 static int cms_msgSigDigest(CMS_SignerInfo *si,
 139                             unsigned char *dig, unsigned int *diglen)
 140 {
 141     const EVP_MD *md;
 142     md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
 143     if (md == NULL)
 144         return 0;
 145     if (!ASN1_item_digest(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
 146                           si->signedAttrs, dig, diglen))
 147         return 0;
 148     return 1;
 149 }
 150
 151 /* Add a msgSigDigest attribute to a SignerInfo */
 152
 153 int cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
 154 {
 155     unsigned char dig[EVP_MAX_MD_SIZE];
 156     unsigned int diglen;
 157     if (!cms_msgSigDigest(src, dig, &diglen)) {
 158         CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, CMS_R_MSGSIGDIGEST_ERROR);
 159         return 0;
 160     }
 161     if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
 162                                      V_ASN1_OCTET_STRING, dig, diglen)) {
 163         CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, ERR_R_MALLOC_FAILURE);
 164         return 0;
 165     }
 166     return 1;
 167 }
 168
 169 /* Verify signed receipt after it has already passed normal CMS verify */
 170
 171 int cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
 172 {
 173     int r = 0, i;
 174     CMS_ReceiptRequest *rr = NULL;
 175     CMS_Receipt *rct = NULL;
 176     STACK_OF(CMS_SignerInfo) *sis, *osis;
 177     CMS_SignerInfo *si, *osi = NULL;
 178     ASN1_OCTET_STRING *msig, **pcont;
 179     ASN1_OBJECT *octype;
 180     unsigned char dig[EVP_MAX_MD_SIZE];
 181     unsigned int diglen;
 182
 183     /* Get SignerInfos, also checks SignedData content type */
 184     osis = CMS_get0_SignerInfos(req_cms);
 185     sis = CMS_get0_SignerInfos(cms);
 186     if (!osis || !sis)
 187         goto err;
 188
 189     if (sk_CMS_SignerInfo_num(sis) != 1) {
 190         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NEED_ONE_SIGNER);
 191         goto err;
 192     }
 193
 194     /* Check receipt content type */
 195     if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
 196         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NOT_A_SIGNED_RECEIPT);
 197         goto err;
 198     }
 199
 200     /* Extract and decode receipt content */
 201     pcont = CMS_get0_content(cms);
 202     if (!pcont || !*pcont) {
 203         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT);
 204         goto err;
 205     }
 206
 207     rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
 208
 209     if (!rct) {
 210         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_RECEIPT_DECODE_ERROR);
 211         goto err;
 212     }
 213
 214     /* Locate original request */
 215
 216     for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
 217         osi = sk_CMS_SignerInfo_value(osis, i);
 218         if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
 219             break;
 220     }
 221
 222     if (i == sk_CMS_SignerInfo_num(osis)) {
 223         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MATCHING_SIGNATURE);
 224         goto err;
 225     }
 226
 227     si = sk_CMS_SignerInfo_value(sis, 0);
 228
 229     /* Get msgSigDigest value and compare */
 230
 231     msig = CMS_signed_get0_data_by_OBJ(si,
 232                                        OBJ_nid2obj
 233                                        (NID_id_smime_aa_msgSigDigest), -3,
 234                                        V_ASN1_OCTET_STRING);
 235
 236     if (!msig) {
 237         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MSGSIGDIGEST);
 238         goto err;
 239     }
 240
 241     if (!cms_msgSigDigest(osi, dig, &diglen)) {
 242         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_ERROR);
 243         goto err;
 244     }
 245
 246     if (diglen != (unsigned int)msig->length) {
 247         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
 248         goto err;
 249     }
 250
 251     if (memcmp(dig, msig->data, diglen)) {
 252         CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
 253                CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
 254         goto err;
 255     }
 256
 257     /* Compare content types */
 258
 259     octype = CMS_signed_get0_data_by_OBJ(osi,
 260                                          OBJ_nid2obj(NID_pkcs9_contentType),
 261                                          -3, V_ASN1_OBJECT);
 262     if (!octype) {
 263         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT_TYPE);
 264         goto err;
 265     }
 266
 267     /* Compare details in receipt request */
 268
 269     if (OBJ_cmp(octype, rct->contentType)) {
 270         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENT_TYPE_MISMATCH);
 271         goto err;
 272     }
 273
 274     /* Get original receipt request details */
 275
 276     if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
 277         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_RECEIPT_REQUEST);
 278         goto err;
 279     }
 280
 281     if (ASN1_STRING_cmp(rr->signedContentIdentifier,
 282                         rct->signedContentIdentifier)) {
 283         CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENTIDENTIFIER_MISMATCH);
 284         goto err;
 285     }
 286
 287     r = 1;
 288
 289  err:
 290     CMS_ReceiptRequest_free(rr);
 291     M_ASN1_free_of(rct, CMS_Receipt);
 292     return r;
 293
 294 }
 295
 296 /*
 297  * Encode a Receipt into an OCTET STRING read for including into content of a
 298  * SignedData ContentInfo.
 299  */
 300
 301 ASN1_OCTET_STRING *cms_encode_Receipt(CMS_SignerInfo *si)
 302 {
 303     CMS_Receipt rct;
 304     CMS_ReceiptRequest *rr = NULL;
 305     ASN1_OBJECT *ctype;
 306     ASN1_OCTET_STRING *os = NULL;
 307
 308     /* Get original receipt request */
 309
 310     /* Get original receipt request details */
 311
 312     if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
 313         CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_RECEIPT_REQUEST);
 314         goto err;
 315     }
 316
 317     /* Get original content type */
 318
 319     ctype = CMS_signed_get0_data_by_OBJ(si,
 320                                         OBJ_nid2obj(NID_pkcs9_contentType),
 321                                         -3, V_ASN1_OBJECT);
 322     if (!ctype) {
 323         CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_CONTENT_TYPE);
 324         goto err;
 325     }
 326
 327     rct.version = 1;
 328     rct.contentType = ctype;
 329     rct.signedContentIdentifier = rr->signedContentIdentifier;
 330     rct.originatorSignatureValue = si->signature;
 331
 332     os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
 333
 334  err:
 335     CMS_ReceiptRequest_free(rr);
 336     return os;
 337 }