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smime.c

/* smime.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 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).
 *
 */

/* S/MIME utility function */

#include <stdio.h>
#include <string.h>
#include "apps.h"
#include <openssl/crypto.h>
#include <openssl/pem.h>
#include <openssl/err.h>

#undef PROG
#define PROG smime_main
static int save_certs(char *signerfile, STACK_OF(X509) *signers);

#define SMIME_OP  0x10
#define SMIME_ENCRYPT   (1 | SMIME_OP)
#define SMIME_DECRYPT   2
#define SMIME_SIGN      (3 | SMIME_OP)
#define SMIME_VERIFY    4
#define SMIME_PK7OUT    5

int MAIN(int, char **);

int MAIN(int argc, char **argv)
{
      ENGINE *e = NULL;
      int operation = 0;
      int ret = 0;
      char **args;
      char *inmode = "r", *outmode = "w";
      char *infile = NULL, *outfile = NULL;
      char *signerfile = NULL, *recipfile = NULL;
      char *certfile = NULL, *keyfile = NULL, *contfile=NULL;
      const EVP_CIPHER *cipher = NULL;
      PKCS7 *p7 = NULL;
      X509_STORE *store = NULL;
      X509 *cert = NULL, *recip = NULL, *signer = NULL;
      EVP_PKEY *key = NULL;
      STACK_OF(X509) *encerts = NULL, *other = NULL;
      BIO *in = NULL, *out = NULL, *indata = NULL;
      int badarg = 0;
      int flags = PKCS7_DETACHED, store_flags = 0;
      char *to = NULL, *from = NULL, *subject = NULL;
      char *CAfile = NULL, *CApath = NULL;
      char *passargin = NULL, *passin = NULL;
      char *inrand = NULL;
      int need_rand = 0;
      int informat = FORMAT_SMIME, outformat = FORMAT_SMIME;
        int keyform = FORMAT_PEM;
#ifndef OPENSSL_NO_ENGINE
      char *engine=NULL;
#endif

      args = argv + 1;
      ret = 1;

      apps_startup();

      if (bio_err == NULL)
            if ((bio_err = BIO_new(BIO_s_file())) != NULL)
                  BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);

      if (!load_config(bio_err, NULL))
            goto end;

      while (!badarg && *args && *args[0] == '-') {
            if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
            else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
            else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
            else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
            else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
#ifndef OPENSSL_NO_DES
            else if (!strcmp (*args, "-des3")) 
                        cipher = EVP_des_ede3_cbc();
            else if (!strcmp (*args, "-des")) 
                        cipher = EVP_des_cbc();
#endif
#ifndef OPENSSL_NO_RC2
            else if (!strcmp (*args, "-rc2-40")) 
                        cipher = EVP_rc2_40_cbc();
            else if (!strcmp (*args, "-rc2-128")) 
                        cipher = EVP_rc2_cbc();
            else if (!strcmp (*args, "-rc2-64")) 
                        cipher = EVP_rc2_64_cbc();
#endif
#ifndef OPENSSL_NO_AES
            else if (!strcmp(*args,"-aes128"))
                        cipher = EVP_aes_128_cbc();
            else if (!strcmp(*args,"-aes192"))
                        cipher = EVP_aes_192_cbc();
            else if (!strcmp(*args,"-aes256"))
                        cipher = EVP_aes_256_cbc();
#endif
            else if (!strcmp (*args, "-text")) 
                        flags |= PKCS7_TEXT;
            else if (!strcmp (*args, "-nointern")) 
                        flags |= PKCS7_NOINTERN;
            else if (!strcmp (*args, "-noverify")) 
                        flags |= PKCS7_NOVERIFY;
            else if (!strcmp (*args, "-nochain")) 
                        flags |= PKCS7_NOCHAIN;
            else if (!strcmp (*args, "-nocerts")) 
                        flags |= PKCS7_NOCERTS;
            else if (!strcmp (*args, "-noattr")) 
                        flags |= PKCS7_NOATTR;
            else if (!strcmp (*args, "-nodetach")) 
                        flags &= ~PKCS7_DETACHED;
            else if (!strcmp (*args, "-nosmimecap"))
                        flags |= PKCS7_NOSMIMECAP;
            else if (!strcmp (*args, "-binary"))
                        flags |= PKCS7_BINARY;
            else if (!strcmp (*args, "-nosigs"))
                        flags |= PKCS7_NOSIGS;
            else if (!strcmp (*args, "-nooldmime"))
                        flags |= PKCS7_NOOLDMIMETYPE;
            else if (!strcmp (*args, "-crlfeol"))
                        flags |= PKCS7_CRLFEOL;
            else if (!strcmp (*args, "-crl_check"))
                        store_flags |= X509_V_FLAG_CRL_CHECK;
            else if (!strcmp (*args, "-crl_check_all"))
                        store_flags |= X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL;
            else if (!strcmp(*args,"-rand")) {
                  if (args[1]) {
                        args++;
                        inrand = *args;
                  } else badarg = 1;
                  need_rand = 1;
#ifndef OPENSSL_NO_ENGINE
            } else if (!strcmp(*args,"-engine")) {
                  if (args[1]) {
                        args++;
                        engine = *args;
                  } else badarg = 1;
#endif
            } else if (!strcmp(*args,"-passin")) {
                  if (args[1]) {
                        args++;
                        passargin = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-to")) {
                  if (args[1]) {
                        args++;
                        to = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-from")) {
                  if (args[1]) {
                        args++;
                        from = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-subject")) {
                  if (args[1]) {
                        args++;
                        subject = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-signer")) {
                  if (args[1]) {
                        args++;
                        signerfile = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-recip")) {
                  if (args[1]) {
                        args++;
                        recipfile = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-inkey")) {
                  if (args[1]) {
                        args++;
                        keyfile = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-keyform")) {
                  if (args[1]) {
                        args++;
                        keyform = str2fmt(*args);
                  } else badarg = 1;
            } else if (!strcmp (*args, "-certfile")) {
                  if (args[1]) {
                        args++;
                        certfile = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-CAfile")) {
                  if (args[1]) {
                        args++;
                        CAfile = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-CApath")) {
                  if (args[1]) {
                        args++;
                        CApath = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-in")) {
                  if (args[1]) {
                        args++;
                        infile = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-inform")) {
                  if (args[1]) {
                        args++;
                        informat = str2fmt(*args);
                  } else badarg = 1;
            } else if (!strcmp (*args, "-outform")) {
                  if (args[1]) {
                        args++;
                        outformat = str2fmt(*args);
                  } else badarg = 1;
            } else if (!strcmp (*args, "-out")) {
                  if (args[1]) {
                        args++;
                        outfile = *args;
                  } else badarg = 1;
            } else if (!strcmp (*args, "-content")) {
                  if (args[1]) {
                        args++;
                        contfile = *args;
                  } else badarg = 1;
            } else badarg = 1;
            args++;
      }

      if(operation == SMIME_SIGN) {
            if(!signerfile) {
                  BIO_printf(bio_err, "No signer certificate specified\n");
                  badarg = 1;
            }
            need_rand = 1;
      } else if(operation == SMIME_DECRYPT) {
            if(!recipfile) {
                  BIO_printf(bio_err, "No recipient certificate and key specified\n");
                  badarg = 1;
            }
      } else if(operation == SMIME_ENCRYPT) {
            if(!*args) {
                  BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
                  badarg = 1;
            }
            need_rand = 1;
      } else if(!operation) badarg = 1;

      if (badarg) {
            BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
            BIO_printf (bio_err, "where options are\n");
            BIO_printf (bio_err, "-encrypt       encrypt message\n");
            BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
            BIO_printf (bio_err, "-sign          sign message\n");
            BIO_printf (bio_err, "-verify        verify signed message\n");
            BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
#ifndef OPENSSL_NO_DES
            BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
            BIO_printf (bio_err, "-des           encrypt with DES\n");
#endif
#ifndef OPENSSL_NO_RC2
            BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40 (default)\n");
            BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
            BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
#endif
#ifndef OPENSSL_NO_AES
            BIO_printf (bio_err, "-aes128, -aes192, -aes256\n");
            BIO_printf (bio_err, "               encrypt PEM output with cbc aes\n");
#endif
            BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
            BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
            BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
            BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
            BIO_printf (bio_err, "-nodetach      use opaque signing\n");
            BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
            BIO_printf (bio_err, "-binary        don't translate message to text\n");
            BIO_printf (bio_err, "-certfile file other certificates file\n");
            BIO_printf (bio_err, "-signer file   signer certificate file\n");
            BIO_printf (bio_err, "-recip  file   recipient certificate file for decryption\n");
            BIO_printf (bio_err, "-in file       input file\n");
            BIO_printf (bio_err, "-inform arg    input format SMIME (default), PEM or DER\n");
            BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
            BIO_printf (bio_err, "-keyform arg   input private key format (PEM or ENGINE)\n");
            BIO_printf (bio_err, "-out file      output file\n");
            BIO_printf (bio_err, "-outform arg   output format SMIME (default), PEM or DER\n");
            BIO_printf (bio_err, "-content file  supply or override content for detached signature\n");
            BIO_printf (bio_err, "-to addr       to address\n");
            BIO_printf (bio_err, "-from ad       from address\n");
            BIO_printf (bio_err, "-subject s     subject\n");
            BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
            BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
            BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
            BIO_printf (bio_err, "-crl_check     check revocation status of signer's certificate using CRLs\n");
            BIO_printf (bio_err, "-crl_check_all check revocation status of signer's certificate chain using CRLs\n");
#ifndef OPENSSL_NO_ENGINE
            BIO_printf (bio_err, "-engine e      use engine e, possibly a hardware device.\n");
#endif
            BIO_printf (bio_err, "-passin arg    input file pass phrase source\n");
            BIO_printf(bio_err,  "-rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
            BIO_printf(bio_err,  "               load the file (or the files in the directory) into\n");
            BIO_printf(bio_err,  "               the random number generator\n");
            BIO_printf (bio_err, "cert.pem       recipient certificate(s) for encryption\n");
            goto end;
      }

#ifndef OPENSSL_NO_ENGINE
        e = setup_engine(bio_err, engine, 0);
#endif

      if(!app_passwd(bio_err, passargin, NULL, &passin, NULL)) {
            BIO_printf(bio_err, "Error getting password\n");
            goto end;
      }

      if (need_rand) {
            app_RAND_load_file(NULL, bio_err, (inrand != NULL));
            if (inrand != NULL)
                  BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
                        app_RAND_load_files(inrand));
      }

      ret = 2;

      if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;

      if(operation & SMIME_OP) {
            if(flags & PKCS7_BINARY) inmode = "rb";
            if(outformat == FORMAT_ASN1) outmode = "wb";
      } else {
            if(flags & PKCS7_BINARY) outmode = "wb";
            if(informat == FORMAT_ASN1) inmode = "rb";
      }

      if(operation == SMIME_ENCRYPT) {
            if (!cipher) {
#ifndef OPENSSL_NO_RC2              
                  cipher = EVP_rc2_40_cbc();
#else
                  BIO_printf(bio_err, "No cipher selected\n");
                  goto end;
#endif
            }
            encerts = sk_X509_new_null();
            while (*args) {
                  if(!(cert = load_cert(bio_err,*args,FORMAT_PEM,
                        NULL, e, "recipient certificate file"))) {
#if 0                   /* An appropriate message is already printed */
                        BIO_printf(bio_err, "Can't read recipient certificate file %s\n", *args);
#endif
                        goto end;
                  }
                  sk_X509_push(encerts, cert);
                  cert = NULL;
                  args++;
            }
      }

      if(signerfile && (operation == SMIME_SIGN)) {
            if(!(signer = load_cert(bio_err,signerfile,FORMAT_PEM, NULL,
                  e, "signer certificate"))) {
#if 0             /* An appropri message has already been printed */
                  BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
#endif
                  goto end;
            }
      }

      if(certfile) {
            if(!(other = load_certs(bio_err,certfile,FORMAT_PEM, NULL,
                  e, "certificate file"))) {
#if 0             /* An appropriate message has already been printed */
                  BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
#endif
                  ERR_print_errors(bio_err);
                  goto end;
            }
      }

      if(recipfile && (operation == SMIME_DECRYPT)) {
            if(!(recip = load_cert(bio_err,recipfile,FORMAT_PEM,NULL,
                  e, "recipient certificate file"))) {
#if 0             /* An appropriate message has alrady been printed */
                  BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
#endif
                  ERR_print_errors(bio_err);
                  goto end;
            }
      }

      if(operation == SMIME_DECRYPT) {
            if(!keyfile) keyfile = recipfile;
      } else if(operation == SMIME_SIGN) {
            if(!keyfile) keyfile = signerfile;
      } else keyfile = NULL;

      if(keyfile) {
            key = load_key(bio_err, keyfile, keyform, 0, passin, e,
                         "signing key file");
            if (!key) {
                  goto end;
                }
      }

      if (infile) {
            if (!(in = BIO_new_file(infile, inmode))) {
                  BIO_printf (bio_err,
                         "Can't open input file %s\n", infile);
                  goto end;
            }
      } else in = BIO_new_fp(stdin, BIO_NOCLOSE);

      if (outfile) {
            if (!(out = BIO_new_file(outfile, outmode))) {
                  BIO_printf (bio_err,
                         "Can't open output file %s\n", outfile);
                  goto end;
            }
      } else {
            out = BIO_new_fp(stdout, BIO_NOCLOSE);
#ifdef OPENSSL_SYS_VMS
            {
                BIO *tmpbio = BIO_new(BIO_f_linebuffer());
                out = BIO_push(tmpbio, out);
            }
#endif
      }

      if(operation == SMIME_VERIFY) {
            if(!(store = setup_verify(bio_err, CAfile, CApath))) goto end;
            X509_STORE_set_flags(store, store_flags);
      }


      ret = 3;

      if(operation == SMIME_ENCRYPT) {
            p7 = PKCS7_encrypt(encerts, in, cipher, flags);
      } else if(operation == SMIME_SIGN) {
            p7 = PKCS7_sign(signer, key, other, in, flags);
            if (BIO_reset(in) != 0 && (flags & PKCS7_DETACHED)) {
              BIO_printf(bio_err, "Can't rewind input file\n");
              goto end;
            }
      } else {
            if(informat == FORMAT_SMIME) 
                  p7 = SMIME_read_PKCS7(in, &indata);
            else if(informat == FORMAT_PEM) 
                  p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
            else if(informat == FORMAT_ASN1) 
                  p7 = d2i_PKCS7_bio(in, NULL);
            else {
                  BIO_printf(bio_err, "Bad input format for PKCS#7 file\n");
                  goto end;
            }

            if(!p7) {
                  BIO_printf(bio_err, "Error reading S/MIME message\n");
                  goto end;
            }
            if(contfile) {
                  BIO_free(indata);
                  if(!(indata = BIO_new_file(contfile, "rb"))) {
                        BIO_printf(bio_err, "Can't read content file %s\n", contfile);
                        goto end;
                  }
            }
      }

      if(!p7) {
            BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
            goto end;
      }

      ret = 4;
      if(operation == SMIME_DECRYPT) {
            if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
                  BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
                  goto end;
            }
      } else if(operation == SMIME_VERIFY) {
            STACK_OF(X509) *signers;
            if(PKCS7_verify(p7, other, store, indata, out, flags)) {
                  BIO_printf(bio_err, "Verification successful\n");
            } else {
                  BIO_printf(bio_err, "Verification failure\n");
                  goto end;
            }
            signers = PKCS7_get0_signers(p7, other, flags);
            if(!save_certs(signerfile, signers)) {
                  BIO_printf(bio_err, "Error writing signers to %s\n",
                                                signerfile);
                  ret = 5;
                  goto end;
            }
            sk_X509_free(signers);
      } else if(operation == SMIME_PK7OUT) {
            PEM_write_bio_PKCS7(out, p7);
      } else {
            if(to) BIO_printf(out, "To: %s\n", to);
            if(from) BIO_printf(out, "From: %s\n", from);
            if(subject) BIO_printf(out, "Subject: %s\n", subject);
            if(outformat == FORMAT_SMIME) 
                  SMIME_write_PKCS7(out, p7, in, flags);
            else if(outformat == FORMAT_PEM) 
                  PEM_write_bio_PKCS7(out,p7);
            else if(outformat == FORMAT_ASN1) 
                  i2d_PKCS7_bio(out,p7);
            else {
                  BIO_printf(bio_err, "Bad output format for PKCS#7 file\n");
                  goto end;
            }
      }
      ret = 0;
end:
      if (need_rand)
            app_RAND_write_file(NULL, bio_err);
      if(ret) ERR_print_errors(bio_err);
      sk_X509_pop_free(encerts, X509_free);
      sk_X509_pop_free(other, X509_free);
      X509_STORE_free(store);
      X509_free(cert);
      X509_free(recip);
      X509_free(signer);
      EVP_PKEY_free(key);
      PKCS7_free(p7);
      BIO_free(in);
      BIO_free(indata);
      BIO_free_all(out);
      if(passin) OPENSSL_free(passin);
      return (ret);
}

static int save_certs(char *signerfile, STACK_OF(X509) *signers)
{
      int i;
      BIO *tmp;
      if(!signerfile) return 1;
      tmp = BIO_new_file(signerfile, "w");
      if(!tmp) return 0;
      for(i = 0; i < sk_X509_num(signers); i++)
            PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
      BIO_free(tmp);
      return 1;
}
      

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