demos/bio/server-conf.c

   1 /*
   2  * Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 <signal.h>
  18 #include <openssl/err.h>
  19 #include <openssl/ssl.h>
  20 #include <openssl/conf.h>
  21
  22 int main(int argc, char *argv[])
  23 {
  24     char *port = "*:4433";
  25     BIO *in = NULL;
  26     BIO *ssl_bio, *tmp;
  27     SSL_CTX *ctx;
  28     SSL_CONF_CTX *cctx = NULL;
  29     CONF *conf = NULL;
  30     STACK_OF(CONF_VALUE) *sect = NULL;
  31     CONF_VALUE *cnf;
  32     long errline = -1;
  33     char buf[512];
  34     int ret = 1, i;
  35
  36     SSL_load_error_strings();
  37
  38     /* Add ciphers and message digests */
  39     OpenSSL_add_ssl_algorithms();
  40
  41     conf = NCONF_new(NULL);
  42
  43     if (NCONF_load(conf, "accept.cnf", &errline) <= 0) {
  44         if (errline <= 0)
  45             fprintf(stderr, "Error processing config file\n");
  46         else
  47             fprintf(stderr, "Error on line %ld\n", errline);
  48         goto err;
  49     }
  50
  51     sect = NCONF_get_section(conf, "default");
  52
  53     if (sect == NULL) {
  54         fprintf(stderr, "Error retrieving default section\n");
  55         goto err;
  56     }
  57
  58     ctx = SSL_CTX_new(TLS_server_method());
  59     cctx = SSL_CONF_CTX_new();
  60     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_SERVER);
  61     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CERTIFICATE);
  62     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
  63     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
  64     for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
  65         int rv;
  66         cnf = sk_CONF_VALUE_value(sect, i);
  67         rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
  68         if (rv > 0)
  69             continue;
  70         if (rv != -2) {
  71             fprintf(stderr, "Error processing %s = %s\n",
  72                     cnf->name, cnf->value);
  73             ERR_print_errors_fp(stderr);
  74             goto err;
  75         }
  76         if (strcmp(cnf->name, "Port") == 0) {
  77             port = cnf->value;
  78         } else {
  79             fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
  80             goto err;
  81         }
  82     }
  83
  84     if (!SSL_CONF_CTX_finish(cctx)) {
  85         fprintf(stderr, "Finish error\n");
  86         ERR_print_errors_fp(stderr);
  87         goto err;
  88     }
  89
  90     /* Setup server side SSL bio */
  91     ssl_bio = BIO_new_ssl(ctx, 0);
  92
  93     if ((in = BIO_new_accept(port)) == NULL)
  94         goto err;
  95
  96     /*
  97      * This means that when a new connection is accepted on 'in', The ssl_bio
  98      * will be 'duplicated' and have the new socket BIO push into it.
  99      * Basically it means the SSL BIO will be automatically setup
 100      */
 101     BIO_set_accept_bios(in, ssl_bio);
 102
 103  again:
 104     /*
 105      * The first call will setup the accept socket, and the second will get a
 106      * socket.  In this loop, the first actual accept will occur in the
 107      * BIO_read() function.
 108      */
 109
 110     if (BIO_do_accept(in) <= 0)
 111         goto err;
 112
 113     for (;;) {
 114         i = BIO_read(in, buf, 512);
 115         if (i == 0) {
 116             /*
 117              * If we have finished, remove the underlying BIO stack so the
 118              * next time we call any function for this BIO, it will attempt
 119              * to do an accept
 120              */
 121             printf("Done\n");
 122             tmp = BIO_pop(in);
 123             BIO_free_all(tmp);
 124             goto again;
 125         }
 126         if (i < 0) {
 127             if (BIO_should_retry(in))
 128                 continue;
 129             goto err;
 130         }
 131         fwrite(buf, 1, i, stdout);
 132         fflush(stdout);
 133     }
 134
 135     ret = 0;
 136  err:
 137     if (ret) {
 138         ERR_print_errors_fp(stderr);
 139     }
 140     BIO_free(in);
 141     exit(ret);
 142     return (!ret);
 143 }