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verify.c
/* apps/verify.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/pem.h>

#undef PROG
#define PROG      verify_main

static int MS_CALLBACK cb(int ok, X509_STORE_CTX *ctx);
static int check(X509_STORE *ctx, char *file,
            STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
            STACK_OF(X509_CRL) *crls, ENGINE *e);
static int v_verbose=0, vflags = 0;

int MAIN(int, char **);

int MAIN(int argc, char **argv)
      {
      ENGINE *e = NULL;
      int i,ret=1, badarg = 0;
      char *CApath=NULL,*CAfile=NULL;
      char *untfile = NULL, *trustfile = NULL, *crlfile = NULL;
      STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
      STACK_OF(X509_CRL) *crls = NULL;
      X509_STORE *cert_ctx=NULL;
      X509_LOOKUP *lookup=NULL;
      X509_VERIFY_PARAM *vpm = NULL;
#ifndef OPENSSL_NO_ENGINE
      char *engine=NULL;
#endif

      cert_ctx=X509_STORE_new();
      if (cert_ctx == NULL) goto end;
      X509_STORE_set_verify_cb(cert_ctx,cb);

      ERR_load_crypto_strings();

      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;

      argc--;
      argv++;
      for (;;)
            {
            if (argc >= 1)
                  {
                  if (strcmp(*argv,"-CApath") == 0)
                        {
                        if (argc-- < 1) goto end;
                        CApath= *(++argv);
                        }
                  else if (strcmp(*argv,"-CAfile") == 0)
                        {
                        if (argc-- < 1) goto end;
                        CAfile= *(++argv);
                        }
                  else if (args_verify(&argv, &argc, &badarg, bio_err,
                                                      &vpm))
                        {
                        if (badarg)
                              goto end;
                        continue;
                        }
                  else if (strcmp(*argv,"-untrusted") == 0)
                        {
                        if (argc-- < 1) goto end;
                        untfile= *(++argv);
                        }
                  else if (strcmp(*argv,"-trusted") == 0)
                        {
                        if (argc-- < 1) goto end;
                        trustfile= *(++argv);
                        }
                  else if (strcmp(*argv,"-CRLfile") == 0)
                        {
                        if (argc-- < 1) goto end;
                        crlfile= *(++argv);
                        }
#ifndef OPENSSL_NO_ENGINE
                  else if (strcmp(*argv,"-engine") == 0)
                        {
                        if (--argc < 1) goto end;
                        engine= *(++argv);
                        }
#endif
                  else if (strcmp(*argv,"-help") == 0)
                        goto end;
                  else if (strcmp(*argv,"-verbose") == 0)
                        v_verbose=1;
                  else if (argv[0][0] == '-')
                        goto end;
                  else
                        break;
                  argc--;
                  argv++;
                  }
            else
                  break;
            }

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

      if (vpm)
            X509_STORE_set1_param(cert_ctx, vpm);

      lookup=X509_STORE_add_lookup(cert_ctx,X509_LOOKUP_file());
      if (lookup == NULL) abort();
      if (CAfile) {
            i=X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM);
            if(!i) {
                  BIO_printf(bio_err, "Error loading file %s\n", CAfile);
                  ERR_print_errors(bio_err);
                  goto end;
            }
      } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
            
      lookup=X509_STORE_add_lookup(cert_ctx,X509_LOOKUP_hash_dir());
      if (lookup == NULL) abort();
      if (CApath) {
            i=X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM);
            if(!i) {
                  BIO_printf(bio_err, "Error loading directory %s\n", CApath);
                  ERR_print_errors(bio_err);
                  goto end;
            }
      } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);

      ERR_clear_error();

      if(untfile)
            {
            untrusted = load_certs(bio_err, untfile, FORMAT_PEM,
                              NULL, e, "untrusted certificates");
            if(!untrusted)
                  goto end;
            }

      if(trustfile)
            {
            trusted = load_certs(bio_err, trustfile, FORMAT_PEM,
                              NULL, e, "trusted certificates");
            if(!trusted)
                  goto end;
            }

      if(crlfile)
            {
            crls = load_crls(bio_err, crlfile, FORMAT_PEM,
                              NULL, e, "other CRLs");
            if(!crls)
                  goto end;
            }

      if (argc < 1) check(cert_ctx, NULL, untrusted, trusted, crls, e);
      else
            for (i=0; i<argc; i++)
                  check(cert_ctx,argv[i], untrusted, trusted, crls, e);
      ret=0;
end:
      if (ret == 1) {
            BIO_printf(bio_err,"usage: verify [-verbose] [-CApath path] [-CAfile file] [-purpose purpose] [-crl_check]");
#ifndef OPENSSL_NO_ENGINE
            BIO_printf(bio_err," [-engine e]");
#endif
            BIO_printf(bio_err," cert1 cert2 ...\n");
            BIO_printf(bio_err,"recognized usages:\n");
            for(i = 0; i < X509_PURPOSE_get_count(); i++) {
                  X509_PURPOSE *ptmp;
                  ptmp = X509_PURPOSE_get0(i);
                  BIO_printf(bio_err, "\t%-10s\t%s\n", X509_PURPOSE_get0_sname(ptmp),
                                                X509_PURPOSE_get0_name(ptmp));
            }
      }
      if (vpm) X509_VERIFY_PARAM_free(vpm);
      if (cert_ctx != NULL) X509_STORE_free(cert_ctx);
      sk_X509_pop_free(untrusted, X509_free);
      sk_X509_pop_free(trusted, X509_free);
      sk_X509_CRL_pop_free(crls, X509_CRL_free);
      apps_shutdown();
      OPENSSL_EXIT(ret);
      }

static int check(X509_STORE *ctx, char *file,
            STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
            STACK_OF(X509_CRL) *crls, ENGINE *e)
      {
      X509 *x=NULL;
      int i=0,ret=0;
      X509_STORE_CTX *csc;

      x = load_cert(bio_err, file, FORMAT_PEM, NULL, e, "certificate file");
      if (x == NULL)
            goto end;
      fprintf(stdout,"%s: ",(file == NULL)?"stdin":file);

      csc = X509_STORE_CTX_new();
      if (csc == NULL)
            {
            ERR_print_errors(bio_err);
            goto end;
            }
      X509_STORE_set_flags(ctx, vflags);
      if(!X509_STORE_CTX_init(csc,ctx,x,uchain))
            {
            ERR_print_errors(bio_err);
            goto end;
            }
      if(tchain) X509_STORE_CTX_trusted_stack(csc, tchain);
      if (crls)
            X509_STORE_CTX_set0_crls(csc, crls);
      i=X509_verify_cert(csc);
      X509_STORE_CTX_free(csc);

      ret=0;
end:
      if (i > 0)
            {
            fprintf(stdout,"OK\n");
            ret=1;
            }
      else
            ERR_print_errors(bio_err);
      if (x != NULL) X509_free(x);

      return(ret);
      }

static int MS_CALLBACK cb(int ok, X509_STORE_CTX *ctx)
      {
      int cert_error = X509_STORE_CTX_get_error(ctx);
      X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);

      if (!ok)
            {
            if (current_cert)
                  {
                  X509_NAME_print_ex_fp(stdout,
                        X509_get_subject_name(current_cert),
                        0, XN_FLAG_ONELINE);
                  printf("\n");
                  }
            printf("%serror %d at %d depth lookup:%s\n",
                  X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path]" : "",
                  cert_error,
                  X509_STORE_CTX_get_error_depth(ctx),
                  X509_verify_cert_error_string(cert_error));
            switch(cert_error)
                  {
                  case X509_V_ERR_NO_EXPLICIT_POLICY:
                        policies_print(NULL, ctx);
                  case X509_V_ERR_CERT_HAS_EXPIRED:

                  /* since we are just checking the certificates, it is
                   * ok if they are self signed. But we should still warn
                   * the user.
                   */

                  case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
                  /* Continue after extension errors too */
                  case X509_V_ERR_INVALID_CA:
                  case X509_V_ERR_INVALID_NON_CA:
                  case X509_V_ERR_PATH_LENGTH_EXCEEDED:
                  case X509_V_ERR_INVALID_PURPOSE:
                  case X509_V_ERR_CRL_HAS_EXPIRED:
                  case X509_V_ERR_CRL_NOT_YET_VALID:
                  case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
                  ok = 1;

                  }

            return ok;

            }
      if (cert_error == X509_V_OK && ok == 2)
            policies_print(NULL, ctx);
      if (!v_verbose)
            ERR_clear_error();
      return(ok);
      }

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