/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 1999. Based on an original idea by Massimiliano Pala (madwolf@openca.org).
 */
/* ====================================================================
 * 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).
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "apps.h"
#include <openssl/bio.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/lhash.h>
#include <openssl/x509.h>
#include <openssl/pem.h>

typedef enum OPTION_choice {
    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
    OPT_NOOUT, OPT_PUBKEY, OPT_VERIFY, OPT_IN, OPT_OUT,
    OPT_ENGINE, OPT_KEY, OPT_CHALLENGE, OPT_PASSIN, OPT_SPKAC,
    OPT_SPKSECT
} OPTION_CHOICE;

OPTIONS spkac_options[] = {
    {"help", OPT_HELP, '-', "Display this summary"},
    {"in", OPT_IN, '<', "Input file"},
    {"out", OPT_OUT, '>', "Output file"},
    {"key", OPT_KEY, '<', "Create SPKAC using private key"},
    {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
    {"challenge", OPT_CHALLENGE, 's', "Challenge string"},
    {"spkac", OPT_SPKAC, 's', "Alternative SPKAC name"},
    {"noout", OPT_NOOUT, '-', "Don't print SPKAC"},
    {"pubkey", OPT_PUBKEY, '-', "Output public key"},
    {"verify", OPT_VERIFY, '-', "Verify SPKAC signature"},
    {"spksect", OPT_SPKSECT, 's'},
#ifndef OPENSSL_NO_ENGINE
    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
#endif
    {NULL}
};

int spkac_main(int argc, char **argv)
{
    BIO *in = NULL, *out = NULL;
    CONF *conf = NULL;
    ENGINE *e = NULL;
    EVP_PKEY *pkey = NULL;
    NETSCAPE_SPKI *spki = NULL;
    char *challenge = NULL, *keyfile = NULL;
    char *infile = NULL, *outfile = NULL, *passinarg = NULL, *passin = NULL;
    char *spkstr = NULL, *prog;
    const char *spkac = "SPKAC", *spksect = "default";
    int i, ret = 1, verify = 0, noout = 0, pubkey = 0;
    OPTION_CHOICE o;

    prog = opt_init(argc, argv, spkac_options);
    while ((o = opt_next()) != OPT_EOF) {
        switch (o) {
        case OPT_EOF:
        case OPT_ERR:
            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
            goto end;
        case OPT_HELP:
            opt_help(spkac_options);
            ret = 0;
            goto end;
        case OPT_IN:
            infile = opt_arg();
            break;
        case OPT_OUT:
            outfile = opt_arg();
            break;
        case OPT_NOOUT:
            noout = 1;
            break;
        case OPT_PUBKEY:
            pubkey = 1;
            break;
        case OPT_VERIFY:
            verify = 1;
            break;
        case OPT_PASSIN:
            passinarg = opt_arg();
            break;
        case OPT_KEY:
            keyfile = opt_arg();
            break;
        case OPT_CHALLENGE:
            challenge = opt_arg();
            break;
        case OPT_SPKAC:
            spkac = opt_arg();
            break;
        case OPT_SPKSECT:
            spksect = opt_arg();
            break;
        case OPT_ENGINE:
            e = setup_engine(opt_arg(), 0);
            break;
        }
    }
    argc = opt_num_rest();
    argv = opt_rest();

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

    if (keyfile) {
        pkey = load_key(strcmp(keyfile, "-") ? keyfile : NULL,
                        FORMAT_PEM, 1, passin, e, "private key");
        if (!pkey) {
            goto end;
        }
        spki = NETSCAPE_SPKI_new();
        if (challenge)
            ASN1_STRING_set(spki->spkac->challenge,
                            challenge, (int)strlen(challenge));
        NETSCAPE_SPKI_set_pubkey(spki, pkey);
        NETSCAPE_SPKI_sign(spki, pkey, EVP_md5());
        spkstr = NETSCAPE_SPKI_b64_encode(spki);

        out = bio_open_default(outfile, "w");
        if (out == NULL)
            goto end;
        BIO_printf(out, "SPKAC=%s\n", spkstr);
        OPENSSL_free(spkstr);
        ret = 0;
        goto end;
    }

    in = bio_open_default(infile, "r");
    if (in == NULL)
        goto end;

    conf = NCONF_new(NULL);
    i = NCONF_load_bio(conf, in, NULL);
    if (!i) {
        BIO_printf(bio_err, "Error parsing config file\n");
        ERR_print_errors(bio_err);
        goto end;
    }

    spkstr = NCONF_get_string(conf, spksect, spkac);

    if (!spkstr) {
        BIO_printf(bio_err, "Can't find SPKAC called \"%s\"\n", spkac);
        ERR_print_errors(bio_err);
        goto end;
    }

    spki = NETSCAPE_SPKI_b64_decode(spkstr, -1);

    if (!spki) {
        BIO_printf(bio_err, "Error loading SPKAC\n");
        ERR_print_errors(bio_err);
        goto end;
    }

    out = bio_open_default(outfile, "w");
    if (out == NULL)
        goto end;

    if (!noout)
        NETSCAPE_SPKI_print(out, spki);
    pkey = NETSCAPE_SPKI_get_pubkey(spki);
    if (verify) {
        i = NETSCAPE_SPKI_verify(spki, pkey);
        if (i > 0)
            BIO_printf(bio_err, "Signature OK\n");
        else {
            BIO_printf(bio_err, "Signature Failure\n");
            ERR_print_errors(bio_err);
            goto end;
        }
    }
    if (pubkey)
        PEM_write_bio_PUBKEY(out, pkey);

    ret = 0;

 end:
    NCONF_free(conf);
    NETSCAPE_SPKI_free(spki);
    BIO_free(in);
    BIO_free_all(out);
    EVP_PKEY_free(pkey);
    if (passin)
        OPENSSL_free(passin);
    return (ret);
}