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pk7_smime.c

/* pk7_smime.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 1999-2004 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

/* Simple PKCS#7 processing functions */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>

PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
              BIO *data, int flags)
{
      PKCS7 *p7 = NULL;
      PKCS7_SIGNER_INFO *si;
      BIO *p7bio = NULL;
      STACK_OF(X509_ALGOR) *smcap = NULL;
      int i;

      if(!X509_check_private_key(signcert, pkey)) {
            PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
                return NULL;
      }

      if(!(p7 = PKCS7_new())) {
            PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
            return NULL;
      }

      if (!PKCS7_set_type(p7, NID_pkcs7_signed))
            goto err;

      if (!PKCS7_content_new(p7, NID_pkcs7_data))
            goto err;

      if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) {
            PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
            goto err;
      }

      if(!(flags & PKCS7_NOCERTS)) {
            if (!PKCS7_add_certificate(p7, signcert))
                  goto err;
            if(certs) for(i = 0; i < sk_X509_num(certs); i++)
                  if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
                        goto err;
      }

      if(!(flags & PKCS7_NOATTR)) {
            if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
                        V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data)))
                  goto err;
            /* Add SMIMECapabilities */
            if(!(flags & PKCS7_NOSMIMECAP))
            {
            if(!(smcap = sk_X509_ALGOR_new_null())) {
                  PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
                  goto err;
            }
#ifndef OPENSSL_NO_DES
            if (!PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1))
                  goto err;
#endif
#ifndef OPENSSL_NO_RC2
            if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128))
                  goto err;
            if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64))
                  goto err;
#endif
#ifndef OPENSSL_NO_DES
            if (!PKCS7_simple_smimecap (smcap, NID_des_cbc, -1))
                  goto err;
#endif
#ifndef OPENSSL_NO_RC2
            if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40))
                  goto err;
#endif
            if (!PKCS7_add_attrib_smimecap (si, smcap))
                  goto err;
            sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
            smcap = NULL;
            }
      }

      if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);

      if (flags & PKCS7_STREAM)
            return p7;


      if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
            PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
            goto err;
      }

      SMIME_crlf_copy(data, p7bio, flags);


      if (!PKCS7_dataFinal(p7,p7bio)) {
            PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
            goto err;
      }

      BIO_free_all(p7bio);
      return p7;
err:
      sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
      BIO_free_all(p7bio);
      PKCS7_free(p7);
      return NULL;
}

int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
                              BIO *indata, BIO *out, int flags)
{
      STACK_OF(X509) *signers;
      X509 *signer;
      STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
      PKCS7_SIGNER_INFO *si;
      X509_STORE_CTX cert_ctx;
      char buf[4096];
      int i, j=0, k, ret = 0;
      BIO *p7bio;
      BIO *tmpin, *tmpout;

      if(!p7) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER);
            return 0;
      }

      if(!PKCS7_type_is_signed(p7)) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE);
            return 0;
      }

      /* Check for no data and no content: no data to verify signature */
      if(PKCS7_get_detached(p7) && !indata) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT);
            return 0;
      }
#if 0
      /* NB: this test commented out because some versions of Netscape
       * illegally include zero length content when signing data.
       */

      /* Check for data and content: two sets of data */
      if(!PKCS7_get_detached(p7) && indata) {
                        PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT);
            return 0;
      }
#endif

      sinfos = PKCS7_get_signer_info(p7);

      if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
            PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA);
            return 0;
      }


      signers = PKCS7_get0_signers(p7, certs, flags);

      if(!signers) return 0;

      /* Now verify the certificates */

      if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) {
            signer = sk_X509_value (signers, k);
            if (!(flags & PKCS7_NOCHAIN)) {
                  if(!X509_STORE_CTX_init(&cert_ctx, store, signer,
                                          p7->d.sign->cert))
                        {
                        PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
                        sk_X509_free(signers);
                        return 0;
                        }
                  X509_STORE_CTX_set_default(&cert_ctx, "smime_sign");
            } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) {
                  PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB);
                  sk_X509_free(signers);
                  return 0;
            }
            if (!(flags & PKCS7_NOCRL))
                  X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
            i = X509_verify_cert(&cert_ctx);
            if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx);
            X509_STORE_CTX_cleanup(&cert_ctx);
            if (i <= 0) {
                  PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR);
                  ERR_add_error_data(2, "Verify error:",
                               X509_verify_cert_error_string(j));
                  sk_X509_free(signers);
                  return 0;
            }
            /* Check for revocation status here */
      }

      /* Performance optimization: if the content is a memory BIO then
       * store its contents in a temporary read only memory BIO. This
       * avoids potentially large numbers of slow copies of data which will
       * occur when reading from a read write memory BIO when signatures
       * are calculated.
       */

      if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM))
            {
            char *ptr;
            long len;
            len = BIO_get_mem_data(indata, &ptr);
            tmpin = BIO_new_mem_buf(ptr, len);
            if (tmpin == NULL)
                  {
                  PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
                  return 0;
                  }
            }
      else
            tmpin = indata;
            

      if (!(p7bio=PKCS7_dataInit(p7,tmpin)))
            goto err;

      if(flags & PKCS7_TEXT) {
            if(!(tmpout = BIO_new(BIO_s_mem()))) {
                  PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE);
                  goto err;
            }
            BIO_set_mem_eof_return(tmpout, 0);
      } else tmpout = out;

      /* We now have to 'read' from p7bio to calculate digests etc. */
      for (;;)
      {
            i=BIO_read(p7bio,buf,sizeof(buf));
            if (i <= 0) break;
            if (tmpout) BIO_write(tmpout, buf, i);
      }

      if(flags & PKCS7_TEXT) {
            if(!SMIME_text(tmpout, out)) {
                  PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR);
                  BIO_free(tmpout);
                  goto err;
            }
            BIO_free(tmpout);
      }

      /* Now Verify All Signatures */
      if (!(flags & PKCS7_NOSIGS))
          for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
            {
            si=sk_PKCS7_SIGNER_INFO_value(sinfos,i);
            signer = sk_X509_value (signers, i);
            j=PKCS7_signatureVerify(p7bio,p7,si, signer);
            if (j <= 0) {
                  PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE);
                  goto err;
            }
      }

      ret = 1;

      err:
      
      if (tmpin == indata)
            {
            if (indata) BIO_pop(p7bio);
            }
      BIO_free_all(p7bio);

      sk_X509_free(signers);

      return ret;
}

STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
{
      STACK_OF(X509) *signers;
      STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
      PKCS7_SIGNER_INFO *si;
      PKCS7_ISSUER_AND_SERIAL *ias;
      X509 *signer;
      int i;

      if(!p7) {
            PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER);
            return NULL;
      }

      if(!PKCS7_type_is_signed(p7)) {
            PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
            return NULL;
      }

      /* Collect all the signers together */

      sinfos = PKCS7_get_signer_info(p7);

      if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
            PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
            return NULL;
      }

      if(!(signers = sk_X509_new_null())) {
            PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
            return NULL;
      }

      for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
      {
          si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
          ias = si->issuer_and_serial;
          signer = NULL;
            /* If any certificates passed they take priority */
          if (certs) signer = X509_find_by_issuer_and_serial (certs,
                                    ias->issuer, ias->serial);
          if (!signer && !(flags & PKCS7_NOINTERN)
                  && p7->d.sign->cert) signer =
                          X509_find_by_issuer_and_serial (p7->d.sign->cert,
                                          ias->issuer, ias->serial);
          if (!signer) {
                  PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
                  sk_X509_free(signers);
                  return NULL;
          }

          if (!sk_X509_push(signers, signer)) {
                  sk_X509_free(signers);
                  return NULL;
          }
      }
      return signers;
}


/* Build a complete PKCS#7 enveloped data */

PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
                                                int flags)
{
      PKCS7 *p7;
      BIO *p7bio = NULL;
      int i;
      X509 *x509;
      if(!(p7 = PKCS7_new())) {
            PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
            return NULL;
      }

      if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
            goto err;
      if(!PKCS7_set_cipher(p7, cipher)) {
            PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
            goto err;
      }

      for(i = 0; i < sk_X509_num(certs); i++) {
            x509 = sk_X509_value(certs, i);
            if(!PKCS7_add_recipient(p7, x509)) {
                  PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
                              PKCS7_R_ERROR_ADDING_RECIPIENT);
                  goto err;
            }
      }

      if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
            PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
            goto err;
      }

      SMIME_crlf_copy(in, p7bio, flags);

      (void)BIO_flush(p7bio);

        if (!PKCS7_dataFinal(p7,p7bio)) {
            PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
            goto err;
      }
        BIO_free_all(p7bio);

      return p7;

      err:

      BIO_free_all(p7bio);
      PKCS7_free(p7);
      return NULL;

}

int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
{
      BIO *tmpmem;
      int ret, i;
      char buf[4096];

      if(!p7) {
            PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER);
            return 0;
      }

      if(!PKCS7_type_is_enveloped(p7)) {
            PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE);
            return 0;
      }

      if(cert && !X509_check_private_key(cert, pkey)) {
            PKCS7err(PKCS7_F_PKCS7_DECRYPT,
                        PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
            return 0;
      }

      if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
            PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
            return 0;
      }

      if (flags & PKCS7_TEXT) {
            BIO *tmpbuf, *bread;
            /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
            if(!(tmpbuf = BIO_new(BIO_f_buffer()))) {
                  PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
                  BIO_free_all(tmpmem);
                  return 0;
            }
            if(!(bread = BIO_push(tmpbuf, tmpmem))) {
                  PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
                  BIO_free_all(tmpbuf);
                  BIO_free_all(tmpmem);
                  return 0;
            }
            ret = SMIME_text(bread, data);
            BIO_free_all(bread);
            return ret;
      } else {
            for(;;) {
                  i = BIO_read(tmpmem, buf, sizeof(buf));
                  if(i <= 0) break;
                  BIO_write(data, buf, i);
            }
            BIO_free_all(tmpmem);
            return 1;
      }
}

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