/*

 * Copyright 1995-2018 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 "apps.h"

#include "progs.h"

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/x509.h>

#include <openssl/pem.h>

#include <openssl/ssl.h>

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT,

    OPT_TEXT, OPT_CERT, OPT_NOOUT, OPT_CONTEXT

} OPTION_CHOICE;

const OPTIONS sess_id_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"inform", OPT_INFORM, 'F', "Input format - default PEM (DER or PEM)"},

    {"outform", OPT_OUTFORM, 'f',

     "Output format - default PEM (PEM, DER or NSS)"},

    {"in", OPT_IN, 's', "Input file - default stdin"},

    {"out", OPT_OUT, '>', "Output file - default stdout"},

    {"text", OPT_TEXT, '-', "Print ssl session id details"},

    {"cert", OPT_CERT, '-', "Output certificate "},

    {"noout", OPT_NOOUT, '-', "Don't output the encoded session info"},

    {"context", OPT_CONTEXT, 's', "Set the session ID context"},

    {NULL}

};

static SSL_SESSION *load_sess_id(char *file, int format);

int sess_id_main(int argc, char **argv)

{

    SSL_SESSION *x = NULL;

    X509 *peer = NULL;

    BIO *out = NULL;

    char *infile = NULL, *outfile = NULL, *context = NULL, *prog;

    int informat = FORMAT_PEM, outformat = FORMAT_PEM;

    int cert = 0, noout = 0, text = 0, ret = 1, i, num = 0;

    OPTION_CHOICE o;

    prog = opt_init(argc, argv, sess_id_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(sess_id_options);

            ret = 0;

            goto end;

        case OPT_INFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))

                goto opthelp;

            break;

        case OPT_OUTFORM:

            if (!opt_format(opt_arg(), OPT_FMT_PEMDER | OPT_FMT_NSS,

                            &outformat))

                goto opthelp;

            break;

        case OPT_IN:

            infile = opt_arg();

            break;

        case OPT_OUT:

            outfile = opt_arg();

            break;

        case OPT_TEXT:

            text = ++num;

            break;

        case OPT_CERT:

            cert = ++num;

            break;

        case OPT_NOOUT:

            noout = ++num;

            break;

        case OPT_CONTEXT:

            context = opt_arg();

            break;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    x = load_sess_id(infile, informat);

    if (x == NULL) {

        goto end;

    }

    peer = SSL_SESSION_get0_peer(x);

    if (context != NULL) {

        size_t ctx_len = strlen(context);

        if (ctx_len > SSL_MAX_SID_CTX_LENGTH) {

            BIO_printf(bio_err, "Context too long\n");

            goto end;

        }

        if (!SSL_SESSION_set1_id_context(x, (unsigned char *)context,

                                         ctx_len)) {

            BIO_printf(bio_err, "Error setting id context\n");

            goto end;

        }

    }

    if (!noout || text) {

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

        if (out == NULL)

            goto end;

    }

    if (text) {

        SSL_SESSION_print(out, x);

        if (cert) {

            if (peer == NULL)

                BIO_puts(out, "No certificate present\n");

            else

                X509_print(out, peer);

        }

    }

    if (!noout && !cert) {

        if (outformat == FORMAT_ASN1) {

            i = i2d_SSL_SESSION_bio(out, x);

        } else if (outformat == FORMAT_PEM) {

            i = PEM_write_bio_SSL_SESSION(out, x);

        } else if (outformat == FORMAT_NSS) {

            i = SSL_SESSION_print_keylog(out, x);

        } else {

            BIO_printf(bio_err, "bad output format specified for outfile\n");

            goto end;

        }

        if (!i) {

            BIO_printf(bio_err, "unable to write SSL_SESSION\n");

            goto end;

        }

    } else if (!noout && (peer != NULL)) { /* just print the certificate */

        if (outformat == FORMAT_ASN1) {

            i = (int)i2d_X509_bio(out, peer);

        } else if (outformat == FORMAT_PEM) {

            i = PEM_write_bio_X509(out, peer);

        } else {

            BIO_printf(bio_err, "bad output format specified for outfile\n");

            goto end;

        }

        if (!i) {

            BIO_printf(bio_err, "unable to write X509\n");

            goto end;

        }

    }

    ret = 0;

 end:

    BIO_free_all(out);

    SSL_SESSION_free(x);

    return ret;

}

static SSL_SESSION *load_sess_id(char *infile, int format)

{

    SSL_SESSION *x = NULL;

    BIO *in = NULL;

    in = bio_open_default(infile, 'r', format);

    if (in == NULL)

        goto end;

    if (format == FORMAT_ASN1)

        x = d2i_SSL_SESSION_bio(in, NULL);

    else

        x = PEM_read_bio_SSL_SESSION(in, NULL, NULL, NULL);

    if (x == NULL) {

        BIO_printf(bio_err, "unable to load SSL_SESSION\n");

        ERR_print_errors(bio_err);

        goto end;

    }

 end:

    BIO_free(in);

    return x;

}