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      1 /*
      2  * Copyright 2013-2017 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License").  You may not use
      5  * this file except in compliance with the License.  You can obtain a copy
      6  * in the file LICENSE in the source distribution or at
      7  * https://www.openssl.org/source/license.html
      8  */
      9 
     10 /*
     11  * A minimal program to serve an SSL connection. It uses blocking. It uses
     12  * the SSL_CONF API with a configuration file. cc -I../../include saccept.c
     13  * -L../.. -lssl -lcrypto -ldl
     14  */
     15 
     16 #include <stdio.h>
     17 #include <string.h>
     18 #include <signal.h>
     19 #include <stdlib.h>
     20 #include <openssl/err.h>
     21 #include <openssl/ssl.h>
     22 #include <openssl/conf.h>
     23 
     24 int main(int argc, char *argv[])
     25 {
     26     char *port = "*:4433";
     27     BIO *in = NULL;
     28     BIO *ssl_bio, *tmp;
     29     SSL_CTX *ctx;
     30     SSL_CONF_CTX *cctx = NULL;
     31     CONF *conf = NULL;
     32     STACK_OF(CONF_VALUE) *sect = NULL;
     33     CONF_VALUE *cnf;
     34     long errline = -1;
     35     char buf[512];
     36     int ret = EXIT_FAILURE, i;
     37 
     38     ctx = SSL_CTX_new(TLS_server_method());
     39 
     40     conf = NCONF_new(NULL);
     41 
     42     if (NCONF_load(conf, "accept.cnf", &errline) <= 0) {
     43         if (errline <= 0)
     44             fprintf(stderr, "Error processing config file\n");
     45         else
     46             fprintf(stderr, "Error on line %ld\n", errline);
     47         goto err;
     48     }
     49 
     50     sect = NCONF_get_section(conf, "default");
     51 
     52     if (sect == NULL) {
     53         fprintf(stderr, "Error retrieving default section\n");
     54         goto err;
     55     }
     56 
     57     cctx = SSL_CONF_CTX_new();
     58     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_SERVER);
     59     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CERTIFICATE);
     60     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
     61     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
     62     for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
     63         int rv;
     64         cnf = sk_CONF_VALUE_value(sect, i);
     65         rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
     66         if (rv > 0)
     67             continue;
     68         if (rv != -2) {
     69             fprintf(stderr, "Error processing %s = %s\n",
     70                     cnf->name, cnf->value);
     71             ERR_print_errors_fp(stderr);
     72             goto err;
     73         }
     74         if (strcmp(cnf->name, "Port") == 0) {
     75             port = cnf->value;
     76         } else {
     77             fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
     78             goto err;
     79         }
     80     }
     81 
     82     if (!SSL_CONF_CTX_finish(cctx)) {
     83         fprintf(stderr, "Finish error\n");
     84         ERR_print_errors_fp(stderr);
     85         goto err;
     86     }
     87 
     88     /* Setup server side SSL bio */
     89     ssl_bio = BIO_new_ssl(ctx, 0);
     90 
     91     if ((in = BIO_new_accept(port)) == NULL)
     92         goto err;
     93 
     94     /*
     95      * This means that when a new connection is accepted on 'in', The ssl_bio
     96      * will be 'duplicated' and have the new socket BIO push into it.
     97      * Basically it means the SSL BIO will be automatically setup
     98      */
     99     BIO_set_accept_bios(in, ssl_bio);
    100 
    101  again:
    102     /*
    103      * The first call will setup the accept socket, and the second will get a
    104      * socket.  In this loop, the first actual accept will occur in the
    105      * BIO_read() function.
    106      */
    107 
    108     if (BIO_do_accept(in) <= 0)
    109         goto err;
    110 
    111     for (;;) {
    112         i = BIO_read(in, buf, 512);
    113         if (i == 0) {
    114             /*
    115              * If we have finished, remove the underlying BIO stack so the
    116              * next time we call any function for this BIO, it will attempt
    117              * to do an accept
    118              */
    119             printf("Done\n");
    120             tmp = BIO_pop(in);
    121             BIO_free_all(tmp);
    122             goto again;
    123         }
    124         if (i < 0) {
    125             if (BIO_should_retry(in))
    126                 continue;
    127             goto err;
    128         }
    129         fwrite(buf, 1, i, stdout);
    130         fflush(stdout);
    131     }
    132 
    133     ret = EXIT_SUCCESS;
    134  err:
    135     if (ret != EXIT_SUCCESS)
    136         ERR_print_errors_fp(stderr);
    137     BIO_free(in);
    138     return ret;
    139 }
    140