demos/bio/client-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 #include <string.h>
  11 #include <openssl/err.h>
  12 #include <openssl/ssl.h>
  13 #include <openssl/conf.h>
  14
  15 int main(int argc, char **argv)
  16 {
  17     BIO *sbio = NULL, *out = NULL;
  18     int i, len, rv;
  19     char tmpbuf[1024];
  20     SSL_CTX *ctx = NULL;
  21     SSL_CONF_CTX *cctx = NULL;
  22     SSL *ssl = NULL;
  23     CONF *conf = NULL;
  24     STACK_OF(CONF_VALUE) *sect = NULL;
  25     CONF_VALUE *cnf;
  26     const char *connect_str = "localhost:4433";
  27     long errline = -1;
  28
  29     ERR_load_crypto_strings();
  30     ERR_load_SSL_strings();
  31     SSL_library_init();
  32
  33     conf = NCONF_new(NULL);
  34
  35     if (NCONF_load(conf, "connect.cnf", &errline) <= 0) {
  36         if (errline <= 0)
  37             fprintf(stderr, "Error processing config file\n");
  38         else
  39             fprintf(stderr, "Error on line %ld\n", errline);
  40         goto end;
  41     }
  42
  43     sect = NCONF_get_section(conf, "default");
  44
  45     if (sect == NULL) {
  46         fprintf(stderr, "Error retrieving default section\n");
  47         goto end;
  48     }
  49
  50     ctx = SSL_CTX_new(TLS_client_method());
  51     cctx = SSL_CONF_CTX_new();
  52     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
  53     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
  54     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
  55     for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
  56         cnf = sk_CONF_VALUE_value(sect, i);
  57         rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
  58         if (rv > 0)
  59             continue;
  60         if (rv != -2) {
  61             fprintf(stderr, "Error processing %s = %s\n",
  62                     cnf->name, cnf->value);
  63             ERR_print_errors_fp(stderr);
  64             goto end;
  65         }
  66         if (strcmp(cnf->name, "Connect") == 0) {
  67             connect_str = cnf->value;
  68         } else {
  69             fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
  70             goto end;
  71         }
  72     }
  73
  74     if (!SSL_CONF_CTX_finish(cctx)) {
  75         fprintf(stderr, "Finish error\n");
  76         ERR_print_errors_fp(stderr);
  77         goto end;
  78     }
  79
  80     /*
  81      * We'd normally set some stuff like the verify paths and * mode here
  82      * because as things stand this will connect to * any server whose
  83      * certificate is signed by any CA.
  84      */
  85
  86     sbio = BIO_new_ssl_connect(ctx);
  87
  88     BIO_get_ssl(sbio, &ssl);
  89
  90     if (!ssl) {
  91         fprintf(stderr, "Can't locate SSL pointer\n");
  92         goto end;
  93     }
  94
  95     /* Don't want any retries */
  96     SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
  97
  98     /* We might want to do other things with ssl here */
  99
 100     BIO_set_conn_hostname(sbio, connect_str);
 101
 102     out = BIO_new_fp(stdout, BIO_NOCLOSE);
 103     if (BIO_do_connect(sbio) <= 0) {
 104         fprintf(stderr, "Error connecting to server\n");
 105         ERR_print_errors_fp(stderr);
 106         goto end;
 107     }
 108
 109     if (BIO_do_handshake(sbio) <= 0) {
 110         fprintf(stderr, "Error establishing SSL connection\n");
 111         ERR_print_errors_fp(stderr);
 112         goto end;
 113     }
 114
 115     /* Could examine ssl here to get connection info */
 116
 117     BIO_puts(sbio, "GET / HTTP/1.0\n\n");
 118     for (;;) {
 119         len = BIO_read(sbio, tmpbuf, 1024);
 120         if (len <= 0)
 121             break;
 122         BIO_write(out, tmpbuf, len);
 123     }
 124  end:
 125     SSL_CONF_CTX_free(cctx);
 126     BIO_free_all(sbio);
 127     BIO_free(out);
 128     NCONF_free(conf);
 129     return 0;
 130 }