demos/bio/server-conf.c

   1 /*
   2  * A minimal program to serve an SSL connection. It uses blocking. It uses
   3  * the SSL_CONF API with a configuration file. cc -I../../include saccept.c
   4  * -L../.. -lssl -lcrypto -ldl
   5  */
   6
   7 #include <stdio.h>
   8 #include <signal.h>
   9 #include <openssl/err.h>
  10 #include <openssl/ssl.h>
  11 #include <openssl/conf.h>
  12
  13 int main(int argc, char *argv[])
  14 {
  15     char *port = "*:4433";
  16     BIO *in = NULL;
  17     BIO *ssl_bio, *tmp;
  18     SSL_CTX *ctx;
  19     SSL_CONF_CTX *cctx = NULL;
  20     CONF *conf = NULL;
  21     STACK_OF(CONF_VALUE) *sect = NULL;
  22     CONF_VALUE *cnf;
  23     long errline = -1;
  24     char buf[512];
  25     int ret = 1, i;
  26
  27     SSL_load_error_strings();
  28
  29     /* Add ciphers and message digests */
  30     OpenSSL_add_ssl_algorithms();
  31
  32     conf = NCONF_new(NULL);
  33
  34     if (NCONF_load(conf, "accept.cnf", &errline) <= 0) {
  35         if (errline <= 0)
  36             fprintf(stderr, "Error processing config file\n");
  37         else
  38             fprintf(stderr, "Error on line %ld\n", errline);
  39         goto err;
  40     }
  41
  42     sect = NCONF_get_section(conf, "default");
  43
  44     if (sect == NULL) {
  45         fprintf(stderr, "Error retrieving default section\n");
  46         goto err;
  47     }
  48
  49     ctx = SSL_CTX_new(TLS_server_method());
  50     cctx = SSL_CONF_CTX_new();
  51     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_SERVER);
  52     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CERTIFICATE);
  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         int rv;
  57         cnf = sk_CONF_VALUE_value(sect, i);
  58         rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
  59         if (rv > 0)
  60             continue;
  61         if (rv != -2) {
  62             fprintf(stderr, "Error processing %s = %s\n",
  63                     cnf->name, cnf->value);
  64             ERR_print_errors_fp(stderr);
  65             goto err;
  66         }
  67         if (strcmp(cnf->name, "Port") == 0) {
  68             port = cnf->value;
  69         } else {
  70             fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
  71             goto err;
  72         }
  73     }
  74
  75     if (!SSL_CONF_CTX_finish(cctx)) {
  76         fprintf(stderr, "Finish error\n");
  77         ERR_print_errors_fp(stderr);
  78         goto err;
  79     }
  80
  81     /* Setup server side SSL bio */
  82     ssl_bio = BIO_new_ssl(ctx, 0);
  83
  84     if ((in = BIO_new_accept(port)) == NULL)
  85         goto err;
  86
  87     /*
  88      * This means that when a new connection is accepted on 'in', The ssl_bio
  89      * will be 'duplicated' and have the new socket BIO push into it.
  90      * Basically it means the SSL BIO will be automatically setup
  91      */
  92     BIO_set_accept_bios(in, ssl_bio);
  93
  94  again:
  95     /*
  96      * The first call will setup the accept socket, and the second will get a
  97      * socket.  In this loop, the first actual accept will occur in the
  98      * BIO_read() function.
  99      */
 100
 101     if (BIO_do_accept(in) <= 0)
 102         goto err;
 103
 104     for (;;) {
 105         i = BIO_read(in, buf, 512);
 106         if (i == 0) {
 107             /*
 108              * If we have finished, remove the underlying BIO stack so the
 109              * next time we call any function for this BIO, it will attempt
 110              * to do an accept
 111              */
 112             printf("Done\n");
 113             tmp = BIO_pop(in);
 114             BIO_free_all(tmp);
 115             goto again;
 116         }
 117         if (i < 0) {
 118             if (BIO_should_retry(in))
 119                 continue;
 120             goto err;
 121         }
 122         fwrite(buf, 1, i, stdout);
 123         fflush(stdout);
 124     }
 125
 126     ret = 0;
 127  err:
 128     if (ret) {
 129         ERR_print_errors_fp(stderr);
 130     }
 131     BIO_free(in);
 132     exit(ret);
 133     return (!ret);
 134 }