/* 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, int purpose, ENGINE *e);
static STACK_OF(X509) *load_untrusted(char *file);
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;
    int purpose = -1;
    char *CApath = NULL, *CAfile = NULL;
    char *untfile = NULL, *trustfile = NULL;
    STACK_OF(X509) *untrusted = NULL, *trusted = 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_func(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);
            }
#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) {
        if (!(untrusted = load_untrusted(untfile))) {
            BIO_printf(bio_err, "Error loading untrusted file %s\n", untfile);
            ERR_print_errors(bio_err);
            goto end;
        }
    }

    if (trustfile) {
        if (!(trusted = load_untrusted(trustfile))) {
            BIO_printf(bio_err, "Error loading untrusted file %s\n",
                       trustfile);
            ERR_print_errors(bio_err);
            goto end;
        }
    }

    if (argc < 1)
        check(cert_ctx, NULL, untrusted, trusted, purpose, e);
    else
        for (i = 0; i < argc; i++)
            check(cert_ctx, argv[i], untrusted, trusted, purpose, 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);
    apps_shutdown();
    OPENSSL_EXIT(ret);
}

static int check(X509_STORE *ctx, char *file, STACK_OF(X509) *uchain,
                 STACK_OF(X509) *tchain, int purpose, 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 (purpose >= 0)
        X509_STORE_CTX_set_purpose(csc, purpose);
    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 STACK_OF(X509) *load_untrusted(char *certfile)
{
    STACK_OF(X509_INFO) *sk = NULL;
    STACK_OF(X509) *stack = NULL, *ret = NULL;
    BIO *in = NULL;
    X509_INFO *xi;

    if (!(stack = sk_X509_new_null())) {
        BIO_printf(bio_err, "memory allocation failure\n");
        goto end;
    }

    if (!(in = BIO_new_file(certfile, "r"))) {
        BIO_printf(bio_err, "error opening the file, %s\n", certfile);
        goto end;
    }

    /* This loads from a file, a stack of x509/crl/pkey sets */
    if (!(sk = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL))) {
        BIO_printf(bio_err, "error reading the file, %s\n", certfile);
        goto end;
    }

    /* scan over it and pull out the certs */
    while (sk_X509_INFO_num(sk)) {
        xi = sk_X509_INFO_shift(sk);
        if (xi->x509 != NULL) {
            sk_X509_push(stack, xi->x509);
            xi->x509 = NULL;
        }
        X509_INFO_free(xi);
    }
    if (!sk_X509_num(stack)) {
        BIO_printf(bio_err, "no certificates in file, %s\n", certfile);
        sk_X509_free(stack);
        goto end;
    }
    ret = stack;
 end:
    BIO_free(in);
    sk_X509_INFO_free(sk);
    return (ret);
}

static int MS_CALLBACK cb(int ok, X509_STORE_CTX *ctx)
{
    char buf[256];

    if (!ok) {
        if (ctx->current_cert) {
            X509_NAME_oneline(X509_get_subject_name(ctx->current_cert), buf,
                              sizeof buf);
            printf("%s\n", buf);
        }
        printf("error %d at %d depth lookup:%s\n", ctx->error,
               ctx->error_depth, X509_verify_cert_error_string(ctx->error));
        if (ctx->error == X509_V_ERR_CERT_HAS_EXPIRED)
            ok = 1;
        /*
         * since we are just checking the certificates, it is ok if they are
         * self signed. But we should still warn the user.
         */
        if (ctx->error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
            ok = 1;
        /* Continue after extension errors too */
        if (ctx->error == X509_V_ERR_INVALID_CA)
            ok = 1;
        if (ctx->error == X509_V_ERR_INVALID_NON_CA)
            ok = 1;
        if (ctx->error == X509_V_ERR_PATH_LENGTH_EXCEEDED)
            ok = 1;
        if (ctx->error == X509_V_ERR_INVALID_PURPOSE)
            ok = 1;
        if (ctx->error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
            ok = 1;
        if (ctx->error == X509_V_ERR_CRL_HAS_EXPIRED)
            ok = 1;
        if (ctx->error == X509_V_ERR_CRL_NOT_YET_VALID)
            ok = 1;
        if (ctx->error == X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION)
            ok = 1;

        if (ctx->error == X509_V_ERR_NO_EXPLICIT_POLICY)
            policies_print(NULL, ctx);
        return ok;

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