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cms_ess.c

/* crypto/cms/cms_ess.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */

#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/rand.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include "cms_lcl.h"

DECLARE_ASN1_ITEM(CMS_ReceiptRequest)
DECLARE_ASN1_ITEM(CMS_Receipt)

IMPLEMENT_ASN1_FUNCTIONS_const(CMS_ReceiptRequest)

/* ESS services: for now just Signed Receipt related */

int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
      {
      ASN1_STRING *str;
      CMS_ReceiptRequest *rr = NULL;
      if (prr)
            *prr = NULL;
      str = CMS_signed_get0_data_by_OBJ(si,
                        OBJ_nid2obj(NID_id_smime_aa_receiptRequest),
                              -3, V_ASN1_SEQUENCE);
      if (!str)
            return 0;

      rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
      if (!rr)
            return -1;
      if (prr)
            *prr = rr;
      else
            CMS_ReceiptRequest_free(rr);
      return 1;
      }

CMS_ReceiptRequest *CMS_ReceiptRequest_create0(unsigned char *id, int idlen,
                        int allorfirst,
                        STACK_OF(GENERAL_NAMES) *receiptList,
                        STACK_OF(GENERAL_NAMES) *receiptsTo)
      {
      CMS_ReceiptRequest *rr = NULL;

      rr = CMS_ReceiptRequest_new();
      if (!rr)
            goto merr;
      if (id)
            ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
      else
            {
            if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
                  goto merr;
            if (RAND_pseudo_bytes(rr->signedContentIdentifier->data, 32) 
                              <= 0)
                  goto err;
            }

      sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
      rr->receiptsTo = receiptsTo;

      if (receiptList)
            {
            rr->receiptsFrom->type = 1;
            rr->receiptsFrom->d.receiptList = receiptList;
            }
      else
            {
            rr->receiptsFrom->type = 0;
            rr->receiptsFrom->d.allOrFirstTier = allorfirst;
            }

      return rr;

      merr:
      CMSerr(CMS_F_CMS_RECEIPTREQUEST_CREATE0, ERR_R_MALLOC_FAILURE);

      err:
      if (rr)
            CMS_ReceiptRequest_free(rr);

      return NULL;
      
      }

int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
      {
      unsigned char *rrder = NULL;
      int rrderlen, r = 0;

      rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
      if (rrderlen < 0)
            goto merr;

      if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
                              V_ASN1_SEQUENCE, rrder, rrderlen))
            goto merr;

      r = 1;

      merr:
      if (!r)
            CMSerr(CMS_F_CMS_ADD1_RECEIPTREQUEST, ERR_R_MALLOC_FAILURE);

      if (rrder)
            OPENSSL_free(rrder);

      return r;
      
      }

void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
                              ASN1_STRING **pcid,
                              int *pallorfirst,
                              STACK_OF(GENERAL_NAMES) **plist,
                              STACK_OF(GENERAL_NAMES) **prto)
      {
      if (pcid)
            *pcid = rr->signedContentIdentifier;
      if (rr->receiptsFrom->type == 0)
            {
            if (pallorfirst)
                  *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
            if (plist)
                  *plist = NULL;
            }
      else
            {
            if (pallorfirst)
                  *pallorfirst = -1;
            if (plist)
                  *plist = rr->receiptsFrom->d.receiptList;
            }
      if (prto)
            *prto = rr->receiptsTo;
      }

/* Digest a SignerInfo structure for msgSigDigest attribute processing */

static int cms_msgSigDigest(CMS_SignerInfo *si,
                        unsigned char *dig, unsigned int *diglen)
      {
      const EVP_MD *md;
      md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
      if (md == NULL)
            return 0;
      if (!ASN1_item_digest(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
                                    si->signedAttrs, dig, diglen))
            return 0;
      return 1;
      }

/* Add a msgSigDigest attribute to a SignerInfo */

int cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
      {
      unsigned char dig[EVP_MAX_MD_SIZE];
      unsigned int diglen;
      if (!cms_msgSigDigest(src, dig, &diglen))
            {
            CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, CMS_R_MSGSIGDIGEST_ERROR);
            return 0;
            }
      if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
                              V_ASN1_OCTET_STRING, dig, diglen))
            {
            CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      return 1;
      }

/* Verify signed receipt after it has already passed normal CMS verify */

int cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
      {
      int r = 0, i;
      CMS_ReceiptRequest *rr = NULL;
      CMS_Receipt *rct = NULL;
      STACK_OF(CMS_SignerInfo) *sis, *osis;
      CMS_SignerInfo *si, *osi = NULL;
      ASN1_OCTET_STRING *msig, **pcont;
      ASN1_OBJECT *octype;
      unsigned char dig[EVP_MAX_MD_SIZE];
      unsigned int diglen;

      /* Get SignerInfos, also checks SignedData content type */
      osis = CMS_get0_SignerInfos(req_cms);
      sis = CMS_get0_SignerInfos(cms);
      if (!osis || !sis)
            goto err;

      if (sk_CMS_SignerInfo_num(sis) != 1)
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NEED_ONE_SIGNER);
            goto err;
            }

      /* Check receipt content type */
      if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt)
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NOT_A_SIGNED_RECEIPT);
            goto err;
            }

      /* Extract and decode receipt content */
      pcont = CMS_get0_content(cms);
      if (!pcont || !*pcont)
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT);
            goto err;
            }

      rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));

      if (!rct)   
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_RECEIPT_DECODE_ERROR);
            goto err;
            }

      /* Locate original request */

      for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++)
            {
            osi = sk_CMS_SignerInfo_value(osis, i);
            if (!ASN1_STRING_cmp(osi->signature,
                              rct->originatorSignatureValue))
                  break;
            }

      if (i == sk_CMS_SignerInfo_num(osis))
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MATCHING_SIGNATURE);
            goto err;
            }

      si = sk_CMS_SignerInfo_value(sis, 0);

      /* Get msgSigDigest value and compare */

      msig = CMS_signed_get0_data_by_OBJ(si,
                        OBJ_nid2obj(NID_id_smime_aa_msgSigDigest),
                              -3, V_ASN1_OCTET_STRING);

      if (!msig)
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MSGSIGDIGEST);
            goto err;
            }

      if (!cms_msgSigDigest(osi, dig, &diglen))
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_ERROR);
            goto err;
            }

      if (diglen != (unsigned int)msig->length)
                  {
                  CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
                        CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
                  goto err;
                  }

      if (memcmp(dig, msig->data, diglen))
                  {
                  CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
                        CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
                  goto err;
                  }

      /* Compare content types */

      octype = CMS_signed_get0_data_by_OBJ(osi,
                        OBJ_nid2obj(NID_pkcs9_contentType),
                              -3, V_ASN1_OBJECT);
      if (!octype)
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT_TYPE);
            goto err;
            }

      /* Compare details in receipt request */

      if (OBJ_cmp(octype, rct->contentType))
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENT_TYPE_MISMATCH);
            goto err;
            }

      /* Get original receipt request details */

      if (CMS_get1_ReceiptRequest(osi, &rr) <= 0)
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_RECEIPT_REQUEST);
            goto err;
            }

      if (ASN1_STRING_cmp(rr->signedContentIdentifier,
                              rct->signedContentIdentifier))
            {
            CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
                              CMS_R_CONTENTIDENTIFIER_MISMATCH);
            goto err;
            }

      r = 1;

      err:
      if (rr)
            CMS_ReceiptRequest_free(rr);
      if (rct)
            M_ASN1_free_of(rct, CMS_Receipt);

      return r;

      }

/* Encode a Receipt into an OCTET STRING read for including into content of
 * a SignedData ContentInfo.
 */

ASN1_OCTET_STRING *cms_encode_Receipt(CMS_SignerInfo *si)
      {
      CMS_Receipt rct;
      CMS_ReceiptRequest *rr = NULL;
      ASN1_OBJECT *ctype;
      ASN1_OCTET_STRING *os = NULL;

      /* Get original receipt request */

      /* Get original receipt request details */

      if (CMS_get1_ReceiptRequest(si, &rr) <= 0)
            {
            CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_RECEIPT_REQUEST);
            goto err;
            }

      /* Get original content type */

      ctype = CMS_signed_get0_data_by_OBJ(si,
                        OBJ_nid2obj(NID_pkcs9_contentType),
                              -3, V_ASN1_OBJECT);
      if (!ctype)
            {
            CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_CONTENT_TYPE);
            goto err;
            }

      rct.version = 1;
      rct.contentType = ctype;
      rct.signedContentIdentifier = rr->signedContentIdentifier;
      rct.originatorSignatureValue = si->signature;

      os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);

      err:
      if (rr)
            CMS_ReceiptRequest_free(rr);

      return os;

      }



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