/* 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;
    int crl_download = 0;
#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);
            } else if (strcmp(*argv, "-crl_download") == 0)
                crl_download = 1;
#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;
    }

    ret = 0;

    if (crl_download)
        store_setup_crl_download(cert_ctx);
    if (argc < 1) {
        if (1 != check(cert_ctx, NULL, untrusted, trusted, crls, e))
            ret = -1;
    } else {
        for (i = 0; i < argc; i++)
            if (1 != check(cert_ctx, argv[i], untrusted, trusted, crls, e))
                ret = -1;
    }

 end:
    if (ret == 1) {
        BIO_printf(bio_err,
                   "usage: verify [-verbose] [-CApath path] [-CAfile file] [-purpose purpose] [-crl_check]");
        BIO_printf(bio_err, " [-no_alt_chains] [-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 < 0 ? 2 : 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);
}
