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 use the
12 * SSL_CONF API with the command line. cc -I../../include server-arg.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
main(int argc,char * argv[])23 int main(int argc, char *argv[])
24 {
25 char *port = "*:4433";
26 BIO *ssl_bio, *tmp;
27 SSL_CTX *ctx;
28 SSL_CONF_CTX *cctx;
29 char buf[512];
30 BIO *in = NULL;
31 int ret = EXIT_FAILURE, i;
32 char **args = argv + 1;
33 int nargs = argc - 1;
34
35 ctx = SSL_CTX_new(TLS_server_method());
36
37 cctx = SSL_CONF_CTX_new();
38 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_SERVER);
39 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CERTIFICATE);
40 SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
41 while (*args && **args == '-') {
42 int rv;
43 /* Parse standard arguments */
44 rv = SSL_CONF_cmd_argv(cctx, &nargs, &args);
45 if (rv == -3) {
46 fprintf(stderr, "Missing argument for %s\n", *args);
47 goto err;
48 }
49 if (rv < 0) {
50 fprintf(stderr, "Error in command %s\n", *args);
51 ERR_print_errors_fp(stderr);
52 goto err;
53 }
54 /* If rv > 0 we processed something so proceed to next arg */
55 if (rv > 0)
56 continue;
57 /* Otherwise application specific argument processing */
58 if (strcmp(*args, "-port") == 0) {
59 port = args[1];
60 if (port == NULL) {
61 fprintf(stderr, "Missing -port argument\n");
62 goto err;
63 }
64 args += 2;
65 nargs -= 2;
66 continue;
67 } else {
68 fprintf(stderr, "Unknown argument %s\n", *args);
69 goto err;
70 }
71 }
72
73 if (!SSL_CONF_CTX_finish(cctx)) {
74 fprintf(stderr, "Finish error\n");
75 ERR_print_errors_fp(stderr);
76 goto err;
77 }
78 #ifdef ITERATE_CERTS
79 /*
80 * Demo of how to iterate over all certificates in an SSL_CTX structure.
81 */
82 {
83 X509 *x;
84 int rv;
85 rv = SSL_CTX_set_current_cert(ctx, SSL_CERT_SET_FIRST);
86 while (rv) {
87 X509 *x = SSL_CTX_get0_certificate(ctx);
88 X509_NAME_print_ex_fp(stdout, X509_get_subject_name(x), 0,
89 XN_FLAG_ONELINE);
90 printf("\n");
91 rv = SSL_CTX_set_current_cert(ctx, SSL_CERT_SET_NEXT);
92 }
93 fflush(stdout);
94 }
95 #endif
96 /* Setup server side SSL bio */
97 ssl_bio = BIO_new_ssl(ctx, 0);
98
99 if ((in = BIO_new_accept(port)) == NULL)
100 goto err;
101
102 /*
103 * This means that when a new connection is accepted on 'in', The ssl_bio
104 * will be 'duplicated' and have the new socket BIO push into it.
105 * Basically it means the SSL BIO will be automatically setup
106 */
107 BIO_set_accept_bios(in, ssl_bio);
108
109 again:
110 /*
111 * The first call will setup the accept socket, and the second will get a
112 * socket. In this loop, the first actual accept will occur in the
113 * BIO_read() function.
114 */
115
116 if (BIO_do_accept(in) <= 0)
117 goto err;
118
119 for (;;) {
120 i = BIO_read(in, buf, 512);
121 if (i == 0) {
122 /*
123 * If we have finished, remove the underlying BIO stack so the
124 * next time we call any function for this BIO, it will attempt
125 * to do an accept
126 */
127 printf("Done\n");
128 tmp = BIO_pop(in);
129 BIO_free_all(tmp);
130 goto again;
131 }
132 if (i < 0)
133 goto err;
134 fwrite(buf, 1, i, stdout);
135 fflush(stdout);
136 }
137
138 ret = EXIT_SUCCESS;
139 err:
140 if (ret != EXIT_SUCCESS)
141 ERR_print_errors_fp(stderr);
142 BIO_free(in);
143 return ret;
144 }
145