1 /*
2 * Copyright 1995-2022 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 /* socket-related functions used by s_client and s_server */
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <errno.h>
15 #include <signal.h>
16 #include <openssl/opensslconf.h>
17
18 /*
19 * With IPv6, it looks like Digital has mixed up the proper order of
20 * recursive header file inclusion, resulting in the compiler complaining
21 * that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is
22 * needed to have fileno() declared correctly... So let's define u_int
23 */
24 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
25 # define __U_INT
26 typedef unsigned int u_int;
27 #endif
28
29 #ifdef _WIN32
30 # include <process.h>
31
32 /* MSVC renamed some POSIX functions to have an underscore prefix. */
33 # ifdef _MSC_VER
34 # define getpid _getpid
35 # endif
36 #endif
37
38 #ifndef OPENSSL_NO_SOCK
39
40 # include "apps.h"
41 # include "s_apps.h"
42 # include "internal/sockets.h"
43
44 # if defined(__TANDEM)
45 # if defined(OPENSSL_TANDEM_FLOSS)
46 # include <floss.h(floss_read)>
47 # endif
48 # endif
49
50 # include <openssl/bio.h>
51 # include <openssl/err.h>
52
53 /* Keep track of our peer's address for the cookie callback */
54 BIO_ADDR *ourpeer = NULL;
55
56 /*
57 * init_client - helper routine to set up socket communication
58 * @sock: pointer to storage of resulting socket.
59 * @host: the host name or path (for AF_UNIX) to connect to.
60 * @port: the port to connect to (ignored for AF_UNIX).
61 * @bindhost: source host or path (for AF_UNIX).
62 * @bindport: source port (ignored for AF_UNIX).
63 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
64 * AF_UNSPEC
65 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
66 * @protocol: socket protocol, e.g. IPPROTO_TCP or IPPROTO_UDP (or 0 for any)
67 *
68 * This will create a socket and use it to connect to a host:port, or if
69 * family == AF_UNIX, to the path found in host.
70 *
71 * If the host has more than one address, it will try them one by one until
72 * a successful connection is established. The resulting socket will be
73 * found in *sock on success, it will be given INVALID_SOCKET otherwise.
74 *
75 * Returns 1 on success, 0 on failure.
76 */
init_client(int * sock,const char * host,const char * port,const char * bindhost,const char * bindport,int family,int type,int protocol)77 int init_client(int *sock, const char *host, const char *port,
78 const char *bindhost, const char *bindport,
79 int family, int type, int protocol)
80 {
81 BIO_ADDRINFO *res = NULL;
82 BIO_ADDRINFO *bindaddr = NULL;
83 const BIO_ADDRINFO *ai = NULL;
84 const BIO_ADDRINFO *bi = NULL;
85 int found = 0;
86 int ret;
87
88 if (BIO_sock_init() != 1)
89 return 0;
90
91 ret = BIO_lookup_ex(host, port, BIO_LOOKUP_CLIENT, family, type, protocol,
92 &res);
93 if (ret == 0) {
94 ERR_print_errors(bio_err);
95 return 0;
96 }
97
98 if (bindhost != NULL || bindport != NULL) {
99 ret = BIO_lookup_ex(bindhost, bindport, BIO_LOOKUP_CLIENT,
100 family, type, protocol, &bindaddr);
101 if (ret == 0) {
102 ERR_print_errors (bio_err);
103 goto out;
104 }
105 }
106
107 ret = 0;
108 for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
109 /* Admittedly, these checks are quite paranoid, we should not get
110 * anything in the BIO_ADDRINFO chain that we haven't
111 * asked for. */
112 OPENSSL_assert((family == AF_UNSPEC
113 || family == BIO_ADDRINFO_family(ai))
114 && (type == 0 || type == BIO_ADDRINFO_socktype(ai))
115 && (protocol == 0
116 || protocol == BIO_ADDRINFO_protocol(ai)));
117
118 if (bindaddr != NULL) {
119 for (bi = bindaddr; bi != NULL; bi = BIO_ADDRINFO_next(bi)) {
120 if (BIO_ADDRINFO_family(bi) == BIO_ADDRINFO_family(ai))
121 break;
122 }
123 if (bi == NULL)
124 continue;
125 ++found;
126 }
127
128 *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
129 BIO_ADDRINFO_protocol(ai), 0);
130 if (*sock == INVALID_SOCKET) {
131 /* Maybe the kernel doesn't support the socket family, even if
132 * BIO_lookup() added it in the returned result...
133 */
134 continue;
135 }
136
137 if (bi != NULL) {
138 if (!BIO_bind(*sock, BIO_ADDRINFO_address(bi),
139 BIO_SOCK_REUSEADDR)) {
140 BIO_closesocket(*sock);
141 *sock = INVALID_SOCKET;
142 break;
143 }
144 }
145
146 #ifndef OPENSSL_NO_SCTP
147 if (protocol == IPPROTO_SCTP) {
148 /*
149 * For SCTP we have to set various options on the socket prior to
150 * connecting. This is done automatically by BIO_new_dgram_sctp().
151 * We don't actually need the created BIO though so we free it again
152 * immediately.
153 */
154 BIO *tmpbio = BIO_new_dgram_sctp(*sock, BIO_NOCLOSE);
155
156 if (tmpbio == NULL) {
157 ERR_print_errors(bio_err);
158 return 0;
159 }
160 BIO_free(tmpbio);
161 }
162 #endif
163
164 if (!BIO_connect(*sock, BIO_ADDRINFO_address(ai),
165 BIO_ADDRINFO_protocol(ai) == IPPROTO_TCP ? BIO_SOCK_NODELAY : 0)) {
166 BIO_closesocket(*sock);
167 *sock = INVALID_SOCKET;
168 continue;
169 }
170
171 /* Success, don't try any more addresses */
172 break;
173 }
174
175 if (*sock == INVALID_SOCKET) {
176 if (bindaddr != NULL && !found) {
177 BIO_printf(bio_err, "Can't bind %saddress for %s%s%s\n",
178 #ifdef AF_INET6
179 BIO_ADDRINFO_family(res) == AF_INET6 ? "IPv6 " :
180 #endif
181 BIO_ADDRINFO_family(res) == AF_INET ? "IPv4 " :
182 BIO_ADDRINFO_family(res) == AF_UNIX ? "unix " : "",
183 bindhost != NULL ? bindhost : "",
184 bindport != NULL ? ":" : "",
185 bindport != NULL ? bindport : "");
186 ERR_clear_error();
187 ret = 0;
188 }
189 ERR_print_errors(bio_err);
190 } else {
191 /* Remove any stale errors from previous connection attempts */
192 ERR_clear_error();
193 ret = 1;
194 }
195 out:
196 if (bindaddr != NULL) {
197 BIO_ADDRINFO_free (bindaddr);
198 }
199 BIO_ADDRINFO_free(res);
200 return ret;
201 }
202
report_server_accept(BIO * out,int asock,int with_address,int with_pid)203 int report_server_accept(BIO *out, int asock, int with_address, int with_pid)
204 {
205 int success = 1;
206
207 if (BIO_printf(out, "ACCEPT") <= 0)
208 return 0;
209 if (with_address) {
210 union BIO_sock_info_u info;
211 char *hostname = NULL;
212 char *service = NULL;
213
214 if ((info.addr = BIO_ADDR_new()) != NULL
215 && BIO_sock_info(asock, BIO_SOCK_INFO_ADDRESS, &info)
216 && (hostname = BIO_ADDR_hostname_string(info.addr, 1)) != NULL
217 && (service = BIO_ADDR_service_string(info.addr, 1)) != NULL) {
218 success = BIO_printf(out,
219 strchr(hostname, ':') == NULL
220 ? /* IPv4 */ " %s:%s"
221 : /* IPv6 */ " [%s]:%s",
222 hostname, service) > 0;
223 } else {
224 (void)BIO_printf(out, "unknown:error\n");
225 success = 0;
226 }
227 OPENSSL_free(hostname);
228 OPENSSL_free(service);
229 BIO_ADDR_free(info.addr);
230 }
231 if (with_pid)
232 success = success && BIO_printf(out, " PID=%d", getpid()) > 0;
233 success = success && BIO_printf(out, "\n") > 0;
234 (void)BIO_flush(out);
235
236 return success;
237 }
238
239 /*
240 * do_server - helper routine to perform a server operation
241 * @accept_sock: pointer to storage of resulting socket.
242 * @host: the host name or path (for AF_UNIX) to connect to.
243 * @port: the port to connect to (ignored for AF_UNIX).
244 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
245 * AF_UNSPEC
246 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
247 * @cb: pointer to a function that receives the accepted socket and
248 * should perform the communication with the connecting client.
249 * @context: pointer to memory that's passed verbatim to the cb function.
250 * @naccept: number of times an incoming connect should be accepted. If -1,
251 * unlimited number.
252 *
253 * This will create a socket and use it to listen to a host:port, or if
254 * family == AF_UNIX, to the path found in host, then start accepting
255 * incoming connections and run cb on the resulting socket.
256 *
257 * 0 on failure, something other on success.
258 */
do_server(int * accept_sock,const char * host,const char * port,int family,int type,int protocol,do_server_cb cb,unsigned char * context,int naccept,BIO * bio_s_out)259 int do_server(int *accept_sock, const char *host, const char *port,
260 int family, int type, int protocol, do_server_cb cb,
261 unsigned char *context, int naccept, BIO *bio_s_out)
262 {
263 int asock = 0;
264 int sock;
265 int i;
266 BIO_ADDRINFO *res = NULL;
267 const BIO_ADDRINFO *next;
268 int sock_family, sock_type, sock_protocol, sock_port;
269 const BIO_ADDR *sock_address;
270 int sock_family_fallback = AF_UNSPEC;
271 const BIO_ADDR *sock_address_fallback = NULL;
272 int sock_options = BIO_SOCK_REUSEADDR;
273 int ret = 0;
274
275 if (BIO_sock_init() != 1)
276 return 0;
277
278 if (!BIO_lookup_ex(host, port, BIO_LOOKUP_SERVER, family, type, protocol,
279 &res)) {
280 ERR_print_errors(bio_err);
281 return 0;
282 }
283
284 /* Admittedly, these checks are quite paranoid, we should not get
285 * anything in the BIO_ADDRINFO chain that we haven't asked for */
286 OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
287 && (type == 0 || type == BIO_ADDRINFO_socktype(res))
288 && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(res)));
289
290 sock_family = BIO_ADDRINFO_family(res);
291 sock_type = BIO_ADDRINFO_socktype(res);
292 sock_protocol = BIO_ADDRINFO_protocol(res);
293 sock_address = BIO_ADDRINFO_address(res);
294 next = BIO_ADDRINFO_next(res);
295 #ifdef AF_INET6
296 if (sock_family == AF_INET6)
297 sock_options |= BIO_SOCK_V6_ONLY;
298 if (next != NULL
299 && BIO_ADDRINFO_socktype(next) == sock_type
300 && BIO_ADDRINFO_protocol(next) == sock_protocol) {
301 if (sock_family == AF_INET
302 && BIO_ADDRINFO_family(next) == AF_INET6) {
303 /* In case AF_INET6 is returned but not supported by the
304 * kernel, retry with the first detected address family */
305 sock_family_fallback = sock_family;
306 sock_address_fallback = sock_address;
307 sock_family = AF_INET6;
308 sock_address = BIO_ADDRINFO_address(next);
309 } else if (sock_family == AF_INET6
310 && BIO_ADDRINFO_family(next) == AF_INET) {
311 sock_options &= ~BIO_SOCK_V6_ONLY;
312 }
313 }
314 #endif
315
316 asock = BIO_socket(sock_family, sock_type, sock_protocol, 0);
317 if (asock == INVALID_SOCKET && sock_family_fallback != AF_UNSPEC) {
318 asock = BIO_socket(sock_family_fallback, sock_type, sock_protocol, 0);
319 sock_address = sock_address_fallback;
320 }
321 if (asock == INVALID_SOCKET
322 || !BIO_listen(asock, sock_address, sock_options)) {
323 BIO_ADDRINFO_free(res);
324 ERR_print_errors(bio_err);
325 if (asock != INVALID_SOCKET)
326 BIO_closesocket(asock);
327 goto end;
328 }
329
330 #ifndef OPENSSL_NO_SCTP
331 if (protocol == IPPROTO_SCTP) {
332 /*
333 * For SCTP we have to set various options on the socket prior to
334 * accepting. This is done automatically by BIO_new_dgram_sctp().
335 * We don't actually need the created BIO though so we free it again
336 * immediately.
337 */
338 BIO *tmpbio = BIO_new_dgram_sctp(asock, BIO_NOCLOSE);
339
340 if (tmpbio == NULL) {
341 BIO_closesocket(asock);
342 ERR_print_errors(bio_err);
343 goto end;
344 }
345 BIO_free(tmpbio);
346 }
347 #endif
348
349 sock_port = BIO_ADDR_rawport(sock_address);
350
351 BIO_ADDRINFO_free(res);
352 res = NULL;
353
354 if (!report_server_accept(bio_s_out, asock, sock_port == 0, 0)) {
355 BIO_closesocket(asock);
356 ERR_print_errors(bio_err);
357 goto end;
358 }
359
360 if (accept_sock != NULL)
361 *accept_sock = asock;
362 for (;;) {
363 char sink[64];
364 struct timeval timeout;
365 fd_set readfds;
366
367 if (type == SOCK_STREAM) {
368 BIO_ADDR_free(ourpeer);
369 ourpeer = BIO_ADDR_new();
370 if (ourpeer == NULL) {
371 BIO_closesocket(asock);
372 ERR_print_errors(bio_err);
373 goto end;
374 }
375 do {
376 sock = BIO_accept_ex(asock, ourpeer, 0);
377 } while (sock < 0 && BIO_sock_should_retry(sock));
378 if (sock < 0) {
379 ERR_print_errors(bio_err);
380 BIO_closesocket(asock);
381 break;
382 }
383 BIO_set_tcp_ndelay(sock, 1);
384 i = (*cb)(sock, type, protocol, context);
385
386 /*
387 * If we ended with an alert being sent, but still with data in the
388 * network buffer to be read, then calling BIO_closesocket() will
389 * result in a TCP-RST being sent. On some platforms (notably
390 * Windows) then this will result in the peer immediately abandoning
391 * the connection including any buffered alert data before it has
392 * had a chance to be read. Shutting down the sending side first,
393 * and then closing the socket sends TCP-FIN first followed by
394 * TCP-RST. This seems to allow the peer to read the alert data.
395 */
396 shutdown(sock, 1); /* SHUT_WR */
397 /*
398 * We just said we have nothing else to say, but it doesn't mean
399 * that the other side has nothing. It's even recommended to
400 * consume incoming data. [In testing context this ensures that
401 * alerts are passed on...]
402 */
403 timeout.tv_sec = 0;
404 timeout.tv_usec = 500000; /* some extreme round-trip */
405 do {
406 FD_ZERO(&readfds);
407 openssl_fdset(sock, &readfds);
408 } while (select(sock + 1, &readfds, NULL, NULL, &timeout) > 0
409 && readsocket(sock, sink, sizeof(sink)) > 0);
410
411 BIO_closesocket(sock);
412 } else {
413 i = (*cb)(asock, type, protocol, context);
414 }
415
416 if (naccept != -1)
417 naccept--;
418 if (i < 0 || naccept == 0) {
419 BIO_closesocket(asock);
420 ret = i;
421 break;
422 }
423 }
424 end:
425 # ifdef AF_UNIX
426 if (family == AF_UNIX)
427 unlink(host);
428 # endif
429 BIO_ADDR_free(ourpeer);
430 ourpeer = NULL;
431 return ret;
432 }
433
do_ssl_shutdown(SSL * ssl)434 void do_ssl_shutdown(SSL *ssl)
435 {
436 int ret;
437
438 do {
439 /* We only do unidirectional shutdown */
440 ret = SSL_shutdown(ssl);
441 if (ret < 0) {
442 switch (SSL_get_error(ssl, ret)) {
443 case SSL_ERROR_WANT_READ:
444 case SSL_ERROR_WANT_WRITE:
445 case SSL_ERROR_WANT_ASYNC:
446 case SSL_ERROR_WANT_ASYNC_JOB:
447 /* We just do busy waiting. Nothing clever */
448 continue;
449 }
450 ret = 0;
451 }
452 } while (ret < 0);
453 }
454
455 #endif /* OPENSSL_NO_SOCK */
456