verify.c

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/* apps/verify.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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]");
        BIO_printf(bio_err," [-attime timestamp]");
#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);
    }