/*

 * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#include "apps.h"

#include "progs.h"

#include <openssl/bio.h>

#include <openssl/conf.h>

#include <openssl/err.h>

#include <openssl/evp.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, OPT_KEYFORM

} OPTION_CHOICE;

const 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"},

    {"keyform", OPT_KEYFORM, 'f', "Private key file format - default PEM (PEM, DER, or ENGINE)"},

    {"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',

     "Specify the name of an SPKAC-dedicated section of configuration"},

#ifndef OPENSSL_NO_ENGINE

    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},

#endif

    {NULL}

};

int spkac_main(int argc, char **argv)

{

    BIO *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;

    int keyformat = FORMAT_PEM;

    OPTION_CHOICE o;

    prog = opt_init(argc, argv, spkac_options);

    while ((o = opt_next()) != OPT_EOF) {

        switch (o) {

        case OPT_EOF:

        case OPT_ERR:

 opthelp:

            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_KEYFORM:

            if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyformat))

                goto opthelp;

            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();

    if (argc != 0)

        goto opthelp;

    if (!app_passwd(passinarg, NULL, &passin, NULL)) {

        BIO_printf(bio_err, "Error getting password\n");

        goto end;

    }

    if (keyfile != NULL) {

        pkey = load_key(strcmp(keyfile, "-") ? keyfile : NULL,

                        keyformat, 1, passin, e, "private key");

        if (pkey == NULL)

            goto end;

        spki = NETSCAPE_SPKI_new();

        if (spki == NULL)

            goto end;

        if (challenge != NULL)

            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);

        if (spkstr == NULL)

            goto end;

        out = bio_open_default(outfile, 'w', FORMAT_TEXT);

        if (out == NULL) {

            OPENSSL_free(spkstr);

            goto end;

        }

        BIO_printf(out, "SPKAC=%s\n", spkstr);

        OPENSSL_free(spkstr);

        ret = 0;

        goto end;

    }

    if ((conf = app_load_config(infile)) == NULL)

        goto end;

    spkstr = NCONF_get_string(conf, spksect, spkac);

    if (spkstr == NULL) {

        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 == NULL) {

        BIO_printf(bio_err, "Error loading SPKAC\n");

        ERR_print_errors(bio_err);

        goto end;

    }

    out = bio_open_default(outfile, 'w', FORMAT_TEXT);

    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_all(out);

    EVP_PKEY_free(pkey);

    release_engine(e);

    OPENSSL_free(passin);

    return ret;

}