blob: 93fc126e113f1f89b6bbbaa68445903831fc21fe [file] [log] [blame]
Willy Tarreaue6b98942007-10-29 01:09:36 +01001/*
2 * AF_INET/AF_INET6 SOCK_STREAM protocol layer (tcp)
3 *
Willy Tarreaue8c66af2008-01-13 18:40:14 +01004 * Copyright 2000-2008 Willy Tarreau <w@1wt.eu>
Willy Tarreaue6b98942007-10-29 01:09:36 +01005 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#include <ctype.h>
14#include <errno.h>
15#include <fcntl.h>
16#include <stdio.h>
17#include <stdlib.h>
18#include <string.h>
19#include <time.h>
20
Willy Tarreau9ea05a72009-06-14 12:07:01 +020021#include <netinet/tcp.h>
22
Willy Tarreaue6b98942007-10-29 01:09:36 +010023#include <sys/param.h>
24#include <sys/socket.h>
25#include <sys/stat.h>
26#include <sys/types.h>
27#include <sys/un.h>
28
Willy Tarreaub6866442008-07-14 23:54:42 +020029#include <common/cfgparse.h>
Willy Tarreaue6b98942007-10-29 01:09:36 +010030#include <common/compat.h>
31#include <common/config.h>
32#include <common/debug.h>
33#include <common/errors.h>
34#include <common/memory.h>
35#include <common/mini-clist.h>
36#include <common/standard.h>
37#include <common/time.h>
38#include <common/version.h>
39
Willy Tarreaue6b98942007-10-29 01:09:36 +010040#include <types/global.h>
Willy Tarreaue6b98942007-10-29 01:09:36 +010041
42#include <proto/acl.h>
43#include <proto/backend.h>
44#include <proto/buffers.h>
45#include <proto/fd.h>
46#include <proto/protocols.h>
47#include <proto/proto_tcp.h>
Willy Tarreaub6866442008-07-14 23:54:42 +020048#include <proto/proxy.h>
Willy Tarreaue6b98942007-10-29 01:09:36 +010049#include <proto/queue.h>
Willy Tarreaue6b98942007-10-29 01:09:36 +010050#include <proto/session.h>
51#include <proto/stream_sock.h>
52#include <proto/task.h>
53
Willy Tarreaue8c66af2008-01-13 18:40:14 +010054#ifdef CONFIG_HAP_CTTPROXY
55#include <import/ip_tproxy.h>
56#endif
57
Willy Tarreaue6b98942007-10-29 01:09:36 +010058static int tcp_bind_listeners(struct protocol *proto);
59
60/* Note: must not be declared <const> as its list will be overwritten */
61static struct protocol proto_tcpv4 = {
62 .name = "tcpv4",
63 .sock_domain = AF_INET,
64 .sock_type = SOCK_STREAM,
65 .sock_prot = IPPROTO_TCP,
66 .sock_family = AF_INET,
67 .sock_addrlen = sizeof(struct sockaddr_in),
68 .l3_addrlen = 32/8,
69 .read = &stream_sock_read,
70 .write = &stream_sock_write,
71 .bind_all = tcp_bind_listeners,
72 .unbind_all = unbind_all_listeners,
73 .enable_all = enable_all_listeners,
74 .listeners = LIST_HEAD_INIT(proto_tcpv4.listeners),
75 .nb_listeners = 0,
76};
77
78/* Note: must not be declared <const> as its list will be overwritten */
79static struct protocol proto_tcpv6 = {
80 .name = "tcpv6",
81 .sock_domain = AF_INET6,
82 .sock_type = SOCK_STREAM,
83 .sock_prot = IPPROTO_TCP,
84 .sock_family = AF_INET6,
85 .sock_addrlen = sizeof(struct sockaddr_in6),
86 .l3_addrlen = 128/8,
87 .read = &stream_sock_read,
88 .write = &stream_sock_write,
89 .bind_all = tcp_bind_listeners,
90 .unbind_all = unbind_all_listeners,
91 .enable_all = enable_all_listeners,
92 .listeners = LIST_HEAD_INIT(proto_tcpv6.listeners),
93 .nb_listeners = 0,
94};
95
Willy Tarreaue8c66af2008-01-13 18:40:14 +010096
97/* Binds ipv4 address <local> to socket <fd>, unless <flags> is set, in which
98 * case we try to bind <remote>. <flags> is a 2-bit field consisting of :
99 * - 0 : ignore remote address (may even be a NULL pointer)
100 * - 1 : use provided address
101 * - 2 : use provided port
102 * - 3 : use both
103 *
104 * The function supports multiple foreign binding methods :
105 * - linux_tproxy: we directly bind to the foreign address
106 * - cttproxy: we bind to a local address then nat.
107 * The second one can be used as a fallback for the first one.
108 * This function returns 0 when everything's OK, 1 if it could not bind, to the
109 * local address, 2 if it could not bind to the foreign address.
110 */
111int tcpv4_bind_socket(int fd, int flags, struct sockaddr_in *local, struct sockaddr_in *remote)
112{
113 struct sockaddr_in bind_addr;
114 int foreign_ok = 0;
115 int ret;
116
117#ifdef CONFIG_HAP_LINUX_TPROXY
118 static int ip_transp_working = 1;
119 if (flags && ip_transp_working) {
120 if (setsockopt(fd, SOL_IP, IP_TRANSPARENT, (char *) &one, sizeof(one)) == 0
121 || setsockopt(fd, SOL_IP, IP_FREEBIND, (char *) &one, sizeof(one)) == 0)
122 foreign_ok = 1;
123 else
124 ip_transp_working = 0;
125 }
126#endif
127 if (flags) {
128 memset(&bind_addr, 0, sizeof(bind_addr));
129 if (flags & 1)
130 bind_addr.sin_addr = remote->sin_addr;
131 if (flags & 2)
132 bind_addr.sin_port = remote->sin_port;
133 }
134
135 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one));
136 if (foreign_ok) {
137 ret = bind(fd, (struct sockaddr *)&bind_addr, sizeof(bind_addr));
138 if (ret < 0)
139 return 2;
140 }
141 else {
142 ret = bind(fd, (struct sockaddr *)local, sizeof(*local));
143 if (ret < 0)
144 return 1;
145 }
146
147 if (!flags)
148 return 0;
149
150#ifdef CONFIG_HAP_CTTPROXY
151 if (!foreign_ok) {
152 struct in_tproxy itp1, itp2;
153 memset(&itp1, 0, sizeof(itp1));
154
155 itp1.op = TPROXY_ASSIGN;
156 itp1.v.addr.faddr = bind_addr.sin_addr;
157 itp1.v.addr.fport = bind_addr.sin_port;
158
159 /* set connect flag on socket */
160 itp2.op = TPROXY_FLAGS;
161 itp2.v.flags = ITP_CONNECT | ITP_ONCE;
162
163 if (setsockopt(fd, SOL_IP, IP_TPROXY, &itp1, sizeof(itp1)) != -1 &&
164 setsockopt(fd, SOL_IP, IP_TPROXY, &itp2, sizeof(itp2)) != -1) {
165 foreign_ok = 1;
166 }
167 }
168#endif
169 if (!foreign_ok)
170 /* we could not bind to a foreign address */
171 return 2;
172
173 return 0;
174}
Willy Tarreaue6b98942007-10-29 01:09:36 +0100175
176/* This function tries to bind a TCPv4/v6 listener. It may return a warning or
177 * an error message in <err> if the message is at most <errlen> bytes long
178 * (including '\0'). The return value is composed from ERR_ABORT, ERR_WARN,
179 * ERR_ALERT, ERR_RETRYABLE and ERR_FATAL. ERR_NONE indicates that everything
180 * was alright and that no message was returned. ERR_RETRYABLE means that an
181 * error occurred but that it may vanish after a retry (eg: port in use), and
182 * ERR_FATAL indicates a non-fixable error.ERR_WARN and ERR_ALERT do not alter
183 * the meaning of the error, but just indicate that a message is present which
184 * should be displayed with the respective level. Last, ERR_ABORT indicates
185 * that it's pointless to try to start other listeners. No error message is
186 * returned if errlen is NULL.
187 */
188int tcp_bind_listener(struct listener *listener, char *errmsg, int errlen)
189{
190 __label__ tcp_return, tcp_close_return;
191 int fd, err;
192 const char *msg = NULL;
193
194 /* ensure we never return garbage */
195 if (errmsg && errlen)
196 *errmsg = 0;
197
198 if (listener->state != LI_ASSIGNED)
199 return ERR_NONE; /* already bound */
200
201 err = ERR_NONE;
202
203 if ((fd = socket(listener->addr.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
204 err |= ERR_RETRYABLE | ERR_ALERT;
205 msg = "cannot create listening socket";
206 goto tcp_return;
207 }
Willy Tarreauedcf6682008-11-30 23:15:34 +0100208
Willy Tarreaue6b98942007-10-29 01:09:36 +0100209 if (fd >= global.maxsock) {
210 err |= ERR_FATAL | ERR_ABORT | ERR_ALERT;
211 msg = "not enough free sockets (raise '-n' parameter)";
212 goto tcp_close_return;
213 }
214
Willy Tarreaufb14edc2009-06-14 15:24:37 +0200215 if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
Willy Tarreaue6b98942007-10-29 01:09:36 +0100216 err |= ERR_FATAL | ERR_ALERT;
217 msg = "cannot make socket non-blocking";
218 goto tcp_close_return;
219 }
220
221 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one)) == -1) {
222 /* not fatal but should be reported */
223 msg = "cannot do so_reuseaddr";
224 err |= ERR_ALERT;
225 }
226
227 if (listener->options & LI_O_NOLINGER)
228 setsockopt(fd, SOL_SOCKET, SO_LINGER, (struct linger *) &nolinger, sizeof(struct linger));
Willy Tarreauedcf6682008-11-30 23:15:34 +0100229
Willy Tarreaue6b98942007-10-29 01:09:36 +0100230#ifdef SO_REUSEPORT
231 /* OpenBSD supports this. As it's present in old libc versions of Linux,
232 * it might return an error that we will silently ignore.
233 */
234 setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char *) &one, sizeof(one));
235#endif
Willy Tarreaub1e52e82008-01-13 14:49:51 +0100236#ifdef CONFIG_HAP_LINUX_TPROXY
Willy Tarreauedcf6682008-11-30 23:15:34 +0100237 if ((listener->options & LI_O_FOREIGN)
Willy Tarreau0a459892008-01-13 17:37:16 +0100238 && (setsockopt(fd, SOL_IP, IP_TRANSPARENT, (char *) &one, sizeof(one)) == -1)
239 && (setsockopt(fd, SOL_IP, IP_FREEBIND, (char *) &one, sizeof(one)) == -1)) {
Willy Tarreaub1e52e82008-01-13 14:49:51 +0100240 msg = "cannot make listening socket transparent";
241 err |= ERR_ALERT;
242 }
243#endif
Willy Tarreau5e6e2042009-02-04 17:19:29 +0100244#ifdef SO_BINDTODEVICE
245 /* Note: this might fail if not CAP_NET_RAW */
246 if (listener->interface) {
247 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
Willy Tarreau604e8302009-03-06 00:48:23 +0100248 listener->interface, strlen(listener->interface) + 1) == -1) {
Willy Tarreau5e6e2042009-02-04 17:19:29 +0100249 msg = "cannot bind listener to device";
250 err |= ERR_WARN;
251 }
252 }
253#endif
Willy Tarreaube1b9182009-06-14 18:48:19 +0200254#ifdef TCP_MAXSEG
255 if (listener->maxseg) {
256 if (setsockopt(fd, SOL_TCP, TCP_MAXSEG,
257 &listener->maxseg, sizeof(listener->maxseg)) == -1) {
258 msg = "cannot set MSS";
259 err |= ERR_WARN;
260 }
261 }
262#endif
Willy Tarreaue6b98942007-10-29 01:09:36 +0100263 if (bind(fd, (struct sockaddr *)&listener->addr, listener->proto->sock_addrlen) == -1) {
264 err |= ERR_RETRYABLE | ERR_ALERT;
265 msg = "cannot bind socket";
266 goto tcp_close_return;
267 }
Willy Tarreauedcf6682008-11-30 23:15:34 +0100268
Willy Tarreauc73ce2b2008-01-06 10:55:10 +0100269 if (listen(fd, listener->backlog ? listener->backlog : listener->maxconn) == -1) {
Willy Tarreaue6b98942007-10-29 01:09:36 +0100270 err |= ERR_RETRYABLE | ERR_ALERT;
271 msg = "cannot listen to socket";
272 goto tcp_close_return;
273 }
Willy Tarreauedcf6682008-11-30 23:15:34 +0100274
Willy Tarreau9ea05a72009-06-14 12:07:01 +0200275#ifdef TCP_QUICKACK
276 if (listener->options & LI_O_NOQUICKACK)
277 setsockopt(fd, SOL_TCP, TCP_QUICKACK, (char *) &zero, sizeof(zero));
278#endif
279
Willy Tarreaue6b98942007-10-29 01:09:36 +0100280 /* the socket is ready */
281 listener->fd = fd;
282 listener->state = LI_LISTEN;
283
284 /* the function for the accept() event */
285 fd_insert(fd);
286 fdtab[fd].cb[DIR_RD].f = listener->accept;
287 fdtab[fd].cb[DIR_WR].f = NULL; /* never called */
288 fdtab[fd].cb[DIR_RD].b = fdtab[fd].cb[DIR_WR].b = NULL;
Willy Tarreaueabf3132008-08-29 23:36:51 +0200289 fdtab[fd].owner = listener; /* reference the listener instead of a task */
Willy Tarreaue6b98942007-10-29 01:09:36 +0100290 fdtab[fd].state = FD_STLISTEN;
Willy Tarreaufb14edc2009-06-14 15:24:37 +0200291 fdtab[fd].flags = FD_FL_TCP;
Willy Tarreau5d707e12009-06-28 11:09:07 +0200292 if (listener->options & LI_O_NOLINGER)
293 fdtab[fd].flags |= FD_FL_TCP_NOLING;
294
Willy Tarreaue6b98942007-10-29 01:09:36 +0100295 fdtab[fd].peeraddr = NULL;
296 fdtab[fd].peerlen = 0;
Willy Tarreaue6b98942007-10-29 01:09:36 +0100297 tcp_return:
298 if (msg && errlen)
299 strlcpy2(errmsg, msg, errlen);
300 return err;
301
302 tcp_close_return:
303 close(fd);
304 goto tcp_return;
305}
306
307/* This function creates all TCP sockets bound to the protocol entry <proto>.
308 * It is intended to be used as the protocol's bind_all() function.
309 * The sockets will be registered but not added to any fd_set, in order not to
310 * loose them across the fork(). A call to enable_all_listeners() is needed
311 * to complete initialization. The return value is composed from ERR_*.
312 */
313static int tcp_bind_listeners(struct protocol *proto)
314{
315 struct listener *listener;
316 int err = ERR_NONE;
317
318 list_for_each_entry(listener, &proto->listeners, proto_list) {
319 err |= tcp_bind_listener(listener, NULL, 0);
320 if ((err & ERR_CODE) == ERR_ABORT)
321 break;
322 }
323
324 return err;
325}
326
327/* Add listener to the list of tcpv4 listeners. The listener's state
328 * is automatically updated from LI_INIT to LI_ASSIGNED. The number of
329 * listeners is updated. This is the function to use to add a new listener.
330 */
331void tcpv4_add_listener(struct listener *listener)
332{
333 if (listener->state != LI_INIT)
334 return;
335 listener->state = LI_ASSIGNED;
336 listener->proto = &proto_tcpv4;
337 LIST_ADDQ(&proto_tcpv4.listeners, &listener->proto_list);
338 proto_tcpv4.nb_listeners++;
339}
340
341/* Add listener to the list of tcpv4 listeners. The listener's state
342 * is automatically updated from LI_INIT to LI_ASSIGNED. The number of
343 * listeners is updated. This is the function to use to add a new listener.
344 */
345void tcpv6_add_listener(struct listener *listener)
346{
347 if (listener->state != LI_INIT)
348 return;
349 listener->state = LI_ASSIGNED;
350 listener->proto = &proto_tcpv6;
351 LIST_ADDQ(&proto_tcpv6.listeners, &listener->proto_list);
352 proto_tcpv6.nb_listeners++;
353}
354
Willy Tarreauedcf6682008-11-30 23:15:34 +0100355/* This function performs the TCP request analysis on the current request. It
356 * returns 1 if the processing can continue on next analysers, or zero if it
357 * needs more data, encounters an error, or wants to immediately abort the
358 * request. It relies on buffers flags, and updates s->req->analysers. Its
359 * behaviour is rather simple:
Willy Tarreau86ef7dc2009-03-15 22:55:47 +0100360 * - the analyser should check for errors and timeouts, and react as expected.
361 * It does not have to close anything upon error, the caller will. Note that
362 * the caller also knows how to report errors and timeouts.
363 * - if the analyser does not have enough data, it must return 0 without calling
Willy Tarreauedcf6682008-11-30 23:15:34 +0100364 * other ones. It should also probably do a buffer_write_dis() to ensure
365 * that unprocessed data will not be forwarded. But that probably depends on
366 * the protocol.
367 * - if an analyser has enough data, it just has to pass on to the next
368 * analyser without using buffer_write_dis() (enabled by default).
369 * - if an analyser thinks it has no added value anymore staying here, it must
370 * reset its bit from the analysers flags in order not to be called anymore.
371 *
372 * In the future, analysers should be able to indicate that they want to be
373 * called after XXX bytes have been received (or transfered), and the min of
374 * all's wishes will be used to ring back (unless a special condition occurs).
375 */
Willy Tarreau3a816292009-07-07 10:55:49 +0200376int tcp_inspect_request(struct session *s, struct buffer *req, int an_bit)
Willy Tarreauedcf6682008-11-30 23:15:34 +0100377{
378 struct tcp_rule *rule;
379 int partial;
380
381 DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
382 now_ms, __FUNCTION__,
383 s,
384 req,
385 req->rex, req->wex,
386 req->flags,
387 req->l,
388 req->analysers);
389
Willy Tarreauedcf6682008-11-30 23:15:34 +0100390 /* We don't know whether we have enough data, so must proceed
391 * this way :
392 * - iterate through all rules in their declaration order
393 * - if one rule returns MISS, it means the inspect delay is
394 * not over yet, then return immediately, otherwise consider
395 * it as a non-match.
396 * - if one rule returns OK, then return OK
397 * - if one rule returns KO, then return KO
398 */
399
Willy Tarreaud869b242009-03-15 14:43:58 +0100400 if (req->flags & BF_SHUTR || !s->fe->tcp_req.inspect_delay || tick_is_expired(req->analyse_exp, now_ms))
Willy Tarreauedcf6682008-11-30 23:15:34 +0100401 partial = 0;
402 else
403 partial = ACL_PARTIAL;
404
405 list_for_each_entry(rule, &s->fe->tcp_req.inspect_rules, list) {
406 int ret = ACL_PAT_PASS;
407
408 if (rule->cond) {
Willy Tarreau51d5dad2009-07-12 10:10:05 +0200409 ret = acl_exec_cond(rule->cond, s->fe, s, &s->txn, ACL_DIR_REQ | partial);
Willy Tarreauedcf6682008-11-30 23:15:34 +0100410 if (ret == ACL_PAT_MISS) {
411 buffer_write_dis(req);
412 /* just set the request timeout once at the beginning of the request */
Willy Tarreaud869b242009-03-15 14:43:58 +0100413 if (!tick_isset(req->analyse_exp) && s->fe->tcp_req.inspect_delay)
Willy Tarreauedcf6682008-11-30 23:15:34 +0100414 req->analyse_exp = tick_add_ifset(now_ms, s->fe->tcp_req.inspect_delay);
415 return 0;
416 }
417
418 ret = acl_pass(ret);
419 if (rule->cond->pol == ACL_COND_UNLESS)
420 ret = !ret;
421 }
422
423 if (ret) {
424 /* we have a matching rule. */
425 if (rule->action == TCP_ACT_REJECT) {
426 buffer_abort(req);
427 buffer_abort(s->rep);
428 req->analysers = 0;
429 s->fe->failed_req++;
430 if (!(s->flags & SN_ERR_MASK))
431 s->flags |= SN_ERR_PRXCOND;
432 if (!(s->flags & SN_FINST_MASK))
433 s->flags |= SN_FINST_R;
434 return 0;
435 }
436 /* otherwise accept */
437 break;
438 }
439 }
440
441 /* if we get there, it means we have no rule which matches, or
442 * we have an explicit accept, so we apply the default accept.
443 */
Willy Tarreau3a816292009-07-07 10:55:49 +0200444 req->analysers &= ~an_bit;
Willy Tarreauedcf6682008-11-30 23:15:34 +0100445 req->analyse_exp = TICK_ETERNITY;
446 return 1;
447}
448
449
Willy Tarreaub6866442008-07-14 23:54:42 +0200450/* This function should be called to parse a line starting with the "tcp-request"
451 * keyword.
452 */
453static int tcp_parse_tcp_req(char **args, int section_type, struct proxy *curpx,
454 struct proxy *defpx, char *err, int errlen)
455{
456 const char *ptr = NULL;
Willy Tarreauc7e961e2008-08-17 17:13:47 +0200457 unsigned int val;
Willy Tarreaub6866442008-07-14 23:54:42 +0200458 int retlen;
459
460 if (!*args[1]) {
461 snprintf(err, errlen, "missing argument for '%s' in %s '%s'",
462 args[0], proxy_type_str(proxy), curpx->id);
463 return -1;
464 }
465
466 if (!strcmp(args[1], "inspect-delay")) {
467 if (curpx == defpx) {
468 snprintf(err, errlen, "%s %s is not allowed in 'defaults' sections",
469 args[0], args[1]);
470 return -1;
471 }
472
473 if (!(curpx->cap & PR_CAP_FE)) {
474 snprintf(err, errlen, "%s %s will be ignored because %s '%s' has no %s capability",
475 args[0], args[1], proxy_type_str(proxy), curpx->id,
476 "frontend");
477 return 1;
478 }
479
480 if (!*args[2] || (ptr = parse_time_err(args[2], &val, TIME_UNIT_MS))) {
481 retlen = snprintf(err, errlen,
482 "'%s %s' expects a positive delay in milliseconds, in %s '%s'",
483 args[0], args[1], proxy_type_str(proxy), curpx->id);
484 if (ptr && retlen < errlen)
485 retlen += snprintf(err+retlen, errlen - retlen,
486 " (unexpected character '%c')", *ptr);
487 return -1;
488 }
489
490 if (curpx->tcp_req.inspect_delay) {
491 snprintf(err, errlen, "ignoring %s %s (was already defined) in %s '%s'",
492 args[0], args[1], proxy_type_str(proxy), curpx->id);
493 return 1;
494 }
495 curpx->tcp_req.inspect_delay = val;
496 return 0;
497 }
498
499 if (!strcmp(args[1], "content")) {
500 int action;
Willy Tarreaudd64f8d2008-07-27 22:02:32 +0200501 int warn = 0;
Willy Tarreaub6866442008-07-14 23:54:42 +0200502 int pol = ACL_COND_NONE;
503 struct acl_cond *cond;
504 struct tcp_rule *rule;
505
506 if (curpx == defpx) {
507 snprintf(err, errlen, "%s %s is not allowed in 'defaults' sections",
508 args[0], args[1]);
509 return -1;
510 }
511
512 if (!strcmp(args[2], "accept"))
513 action = TCP_ACT_ACCEPT;
514 else if (!strcmp(args[2], "reject"))
515 action = TCP_ACT_REJECT;
516 else {
517 retlen = snprintf(err, errlen,
518 "'%s %s' expects 'accept' or 'reject', in %s '%s' (was '%s')",
519 args[0], args[1], proxy_type_str(curpx), curpx->id, args[2]);
520 return -1;
521 }
522
523 pol = ACL_COND_NONE;
524 cond = NULL;
525
526 if (!strcmp(args[3], "if"))
527 pol = ACL_COND_IF;
528 else if (!strcmp(args[3], "unless"))
529 pol = ACL_COND_UNLESS;
530
531 /* Note: we consider "if TRUE" when there is no condition */
532 if (pol != ACL_COND_NONE &&
533 (cond = parse_acl_cond((const char **)args+4, &curpx->acl, pol)) == NULL) {
534 retlen = snprintf(err, errlen,
Willy Tarreaudd64f8d2008-07-27 22:02:32 +0200535 "error detected in %s '%s' while parsing '%s' condition",
Willy Tarreaub6866442008-07-14 23:54:42 +0200536 proxy_type_str(curpx), curpx->id, args[3]);
537 return -1;
538 }
539
Willy Tarreaudd64f8d2008-07-27 22:02:32 +0200540 // FIXME: how to set this ?
541 // cond->line = linenum;
Willy Tarreaua9fb0832009-07-10 20:53:53 +0200542 if (cond)
543 curpx->acl_requires |= cond->requires;
Willy Tarreau8e80e0b2009-05-10 12:05:46 +0200544 if (cond && cond->requires & (ACL_USE_RTR_ANY | ACL_USE_L7_ANY)) {
Willy Tarreaudd64f8d2008-07-27 22:02:32 +0200545 struct acl *acl;
546 const char *name;
547
548 acl = cond_find_require(cond, ACL_USE_RTR_ANY|ACL_USE_L7_ANY);
549 name = acl ? acl->name : "(unknown)";
550
551 retlen = snprintf(err, errlen,
552 "acl '%s' involves some %s criteria which will be ignored.",
553 name,
554 (acl->requires & ACL_USE_RTR_ANY) ? "response-only" : "layer 7");
555 warn++;
556 }
Willy Tarreaub6866442008-07-14 23:54:42 +0200557 rule = (struct tcp_rule *)calloc(1, sizeof(*rule));
558 rule->cond = cond;
559 rule->action = action;
560 LIST_INIT(&rule->list);
561 LIST_ADDQ(&curpx->tcp_req.inspect_rules, &rule->list);
Willy Tarreaudd64f8d2008-07-27 22:02:32 +0200562 return warn;
Willy Tarreaub6866442008-07-14 23:54:42 +0200563 }
564
565 snprintf(err, errlen, "unknown argument '%s' after '%s' in %s '%s'",
566 args[1], args[0], proxy_type_str(proxy), curpx->id);
567 return -1;
568}
569
570/* return the number of bytes in the request buffer */
571static int
572acl_fetch_req_len(struct proxy *px, struct session *l4, void *l7, int dir,
573 struct acl_expr *expr, struct acl_test *test)
574{
575 if (!l4 || !l4->req)
576 return 0;
577
578 test->i = l4->req->l;
579 test->flags = ACL_TEST_F_VOLATILE | ACL_TEST_F_MAY_CHANGE;
580 return 1;
581}
582
Willy Tarreau655e26a2008-07-15 18:58:05 +0200583/* Return the version of the SSL protocol in the request. It supports both
584 * SSLv3 (TLSv1) header format for any message, and SSLv2 header format for
585 * the hello message. The SSLv3 format is described in RFC 2246 p49, and the
586 * SSLv2 format is described here, and completed p67 of RFC 2246 :
587 * http://wp.netscape.com/eng/security/SSL_2.html
588 *
589 * Note: this decoder only works with non-wrapping data.
590 */
591static int
592acl_fetch_req_ssl_ver(struct proxy *px, struct session *l4, void *l7, int dir,
593 struct acl_expr *expr, struct acl_test *test)
594{
595 int version, bleft, msg_len;
596 const unsigned char *data;
597
598 if (!l4 || !l4->req)
599 return 0;
600
601 msg_len = 0;
602 bleft = l4->req->l;
603 if (!bleft)
604 goto too_short;
605
Willy Tarreauc7e961e2008-08-17 17:13:47 +0200606 data = (const unsigned char *)l4->req->w;
Willy Tarreau655e26a2008-07-15 18:58:05 +0200607 if ((*data >= 0x14 && *data <= 0x17) || (*data == 0xFF)) {
608 /* SSLv3 header format */
609 if (bleft < 5)
610 goto too_short;
611
612 version = (data[1] << 16) + data[2]; /* version: major, minor */
613 msg_len = (data[3] << 8) + data[4]; /* record length */
614
615 /* format introduced with SSLv3 */
616 if (version < 0x00030000)
617 goto not_ssl;
618
619 /* message length between 1 and 2^14 + 2048 */
620 if (msg_len < 1 || msg_len > ((1<<14) + 2048))
621 goto not_ssl;
622
623 bleft -= 5; data += 5;
624 } else {
625 /* SSLv2 header format, only supported for hello (msg type 1) */
626 int rlen, plen, cilen, silen, chlen;
627
628 if (*data & 0x80) {
629 if (bleft < 3)
630 goto too_short;
631 /* short header format : 15 bits for length */
632 rlen = ((data[0] & 0x7F) << 8) | data[1];
633 plen = 0;
634 bleft -= 2; data += 2;
635 } else {
636 if (bleft < 4)
637 goto too_short;
638 /* long header format : 14 bits for length + pad length */
639 rlen = ((data[0] & 0x3F) << 8) | data[1];
640 plen = data[2];
641 bleft -= 3; data += 2;
642 }
643
644 if (*data != 0x01)
645 goto not_ssl;
646 bleft--; data++;
647
648 if (bleft < 8)
649 goto too_short;
650 version = (data[0] << 16) + data[1]; /* version: major, minor */
651 cilen = (data[2] << 8) + data[3]; /* cipher len, multiple of 3 */
652 silen = (data[4] << 8) + data[5]; /* session_id_len: 0 or 16 */
653 chlen = (data[6] << 8) + data[7]; /* 16<=challenge length<=32 */
654
655 bleft -= 8; data += 8;
656 if (cilen % 3 != 0)
657 goto not_ssl;
658 if (silen && silen != 16)
659 goto not_ssl;
660 if (chlen < 16 || chlen > 32)
661 goto not_ssl;
662 if (rlen != 9 + cilen + silen + chlen)
663 goto not_ssl;
664
665 /* focus on the remaining data length */
666 msg_len = cilen + silen + chlen + plen;
667 }
668 /* We could recursively check that the buffer ends exactly on an SSL
669 * fragment boundary and that a possible next segment is still SSL,
670 * but that's a bit pointless. However, we could still check that
671 * all the part of the request which fits in a buffer is already
672 * there.
673 */
Willy Tarreau03d60bb2009-01-09 11:13:00 +0100674 if (msg_len > l4->req->max_len + l4->req->data - l4->req->w)
675 msg_len = l4->req->max_len + l4->req->data - l4->req->w;
Willy Tarreau655e26a2008-07-15 18:58:05 +0200676
677 if (bleft < msg_len)
678 goto too_short;
679
680 /* OK that's enough. We have at least the whole message, and we have
681 * the protocol version.
682 */
683 test->i = version;
684 test->flags = ACL_TEST_F_VOLATILE;
685 return 1;
686
687 too_short:
688 test->flags = ACL_TEST_F_MAY_CHANGE;
689 not_ssl:
690 return 0;
691}
692
Emeric Brunbede3d02009-06-30 17:54:00 +0200693int
694acl_fetch_rdp_cookie(struct proxy *px, struct session *l4, void *l7, int dir,
695 struct acl_expr *expr, struct acl_test *test)
696{
697 int bleft;
698 const unsigned char *data;
699
700 if (!l4 || !l4->req)
701 return 0;
702
703 test->flags = 0;
704
705 bleft = l4->req->l;
706 if (bleft <= 11)
707 goto too_short;
708
709 data = (const unsigned char *)l4->req->w + 11;
710 bleft -= 11;
711
712 if (bleft <= 7)
713 goto too_short;
714
715 if (strncasecmp((const char *)data, "Cookie:", 7) != 0)
716 goto not_cookie;
717
718 data += 7;
719 bleft -= 7;
720
721 while (bleft > 0 && *data == ' ') {
722 data++;
723 bleft--;
724 }
725
726 if (expr->arg_len) {
727
728 if (bleft <= expr->arg_len)
729 goto too_short;
730
731 if ((data[expr->arg_len] != '=') ||
732 strncasecmp(expr->arg.str, (const char *)data, expr->arg_len) != 0)
733 goto not_cookie;
734
735 data += expr->arg_len + 1;
736 bleft -= expr->arg_len + 1;
737 } else {
738 while (bleft > 0 && *data != '=') {
739 if (*data == '\r' || *data == '\n')
740 goto not_cookie;
741 data++;
742 bleft--;
743 }
744
745 if (bleft < 1)
746 goto too_short;
747
748 if (*data != '=')
749 goto not_cookie;
750
751 data++;
752 bleft--;
753 }
754
755 /* data points to cookie value */
756 test->ptr = (char *)data;
757 test->len = 0;
758
759 while (bleft > 0 && *data != '\r') {
760 data++;
761 bleft--;
762 }
763
764 if (bleft < 2)
765 goto too_short;
766
767 if (data[0] != '\r' || data[1] != '\n')
768 goto not_cookie;
769
770 test->len = (char *)data - test->ptr;
771 test->flags = ACL_TEST_F_VOLATILE;
772 return 1;
773
774 too_short:
775 test->flags = ACL_TEST_F_MAY_CHANGE;
776 not_cookie:
777 return 0;
778}
779
780static int
781acl_fetch_rdp_cookie_cnt(struct proxy *px, struct session *l4, void *l7, int dir,
782 struct acl_expr *expr, struct acl_test *test)
783{
784 int ret;
785
786 ret = acl_fetch_rdp_cookie(px, l4, l7, dir, expr, test);
787
788 test->ptr = NULL;
789 test->len = 0;
790
791 if (test->flags & ACL_TEST_F_MAY_CHANGE)
792 return 0;
793
794 test->flags = ACL_TEST_F_VOLATILE;
795 test->i = ret;
796
797 return 1;
798}
Willy Tarreaub6866442008-07-14 23:54:42 +0200799
800static struct cfg_kw_list cfg_kws = {{ },{
801 { CFG_LISTEN, "tcp-request", tcp_parse_tcp_req },
802 { 0, NULL, NULL },
803}};
804
805static struct acl_kw_list acl_kws = {{ },{
Willy Tarreau0ceba5a2008-07-25 19:31:03 +0200806 { "req_len", acl_parse_int, acl_fetch_req_len, acl_match_int, ACL_USE_L4REQ_VOLATILE },
807 { "req_ssl_ver", acl_parse_dotted_ver, acl_fetch_req_ssl_ver, acl_match_int, ACL_USE_L4REQ_VOLATILE },
Emeric Brunbede3d02009-06-30 17:54:00 +0200808 { "req_rdp_cookie", acl_parse_str, acl_fetch_rdp_cookie, acl_match_str, ACL_USE_L4REQ_VOLATILE },
809 { "req_rdp_cookie_cnt", acl_parse_int, acl_fetch_rdp_cookie_cnt, acl_match_int, ACL_USE_L4REQ_VOLATILE },
Willy Tarreaub6866442008-07-14 23:54:42 +0200810 { NULL, NULL, NULL, NULL },
811}};
812
Willy Tarreaue6b98942007-10-29 01:09:36 +0100813__attribute__((constructor))
814static void __tcp_protocol_init(void)
815{
816 protocol_register(&proto_tcpv4);
817 protocol_register(&proto_tcpv6);
Willy Tarreaub6866442008-07-14 23:54:42 +0200818 cfg_register_keywords(&cfg_kws);
819 acl_register_keywords(&acl_kws);
Willy Tarreaue6b98942007-10-29 01:09:36 +0100820}
821
822
823/*
824 * Local variables:
825 * c-indent-level: 8
826 * c-basic-offset: 8
827 * End:
828 */