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
main(int argc,char * argv[])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
