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1 | /* authd/providers/opm.c - small open proxy monitor | |
2 | * Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me> | |
3 | * | |
4 | * Permission to use, copy, modify, and/or distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice is present in all copies. | |
7 | * | |
8 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
9 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
10 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
11 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
12 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
13 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
14 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
15 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
16 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
17 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
18 | * POSSIBILITY OF SUCH DAMAGE. | |
19 | */ | |
20 | ||
21 | #include "stdinc.h" | |
22 | #include "rb_lib.h" | |
23 | #include "defaults.h" | |
24 | #include "setup.h" | |
25 | #include "authd.h" | |
26 | #include "notice.h" | |
27 | #include "provider.h" | |
28 | ||
29 | #define SELF_PID (opm_provider.id) | |
30 | ||
31 | #define OPM_READSIZE 128 | |
32 | ||
33 | typedef enum protocol_t | |
34 | { | |
35 | PROTO_NONE, | |
36 | PROTO_SOCKS4, | |
37 | PROTO_SOCKS5, | |
38 | PROTO_HTTP_CONNECT, | |
39 | PROTO_HTTPS_CONNECT, | |
40 | } protocol_t; | |
41 | ||
42 | /* Lookup data associated with auth client */ | |
43 | struct opm_lookup | |
44 | { | |
45 | rb_dlink_list scans; /* List of scans */ | |
46 | bool in_progress; | |
47 | }; | |
48 | ||
49 | struct opm_scan; | |
50 | typedef void (*opm_callback_t)(struct opm_scan *); | |
51 | ||
52 | /* A proxy scanner */ | |
53 | struct opm_proxy | |
54 | { | |
55 | char note[16]; | |
56 | protocol_t proto; | |
57 | uint16_t port; | |
58 | bool ssl; /* Connect to proxy with SSL */ | |
59 | bool ipv6; /* Proxy supports IPv6 */ | |
60 | ||
61 | opm_callback_t callback; | |
62 | ||
63 | rb_dlink_node node; | |
64 | }; | |
65 | ||
66 | /* A listener for proxy replies */ | |
67 | struct opm_listener | |
68 | { | |
69 | char ip[HOSTIPLEN]; | |
70 | uint16_t port; | |
71 | struct rb_sockaddr_storage addr; | |
72 | rb_fde_t *F; | |
73 | }; | |
74 | ||
75 | /* An individual proxy scan */ | |
76 | struct opm_scan | |
77 | { | |
78 | struct auth_client *auth; | |
79 | rb_fde_t *F; /* fd for scan */ | |
80 | ||
81 | struct opm_proxy *proxy; /* Associated proxy */ | |
82 | struct opm_listener *listener; /* Associated listener */ | |
83 | ||
84 | rb_dlink_node node; | |
85 | }; | |
86 | ||
87 | /* Proxies that we scan for */ | |
88 | static rb_dlink_list proxy_scanners; | |
89 | ||
90 | static ACCB accept_opm; | |
91 | static PF read_opm_reply; | |
92 | ||
93 | static CNCB opm_connected; | |
94 | ||
95 | static void opm_cancel(struct auth_client *auth); | |
96 | static bool create_listener(const char *ip, uint16_t port); | |
97 | ||
98 | static int opm_timeout = OPM_TIMEOUT_DEFAULT; | |
99 | static bool opm_enable = false; | |
100 | ||
101 | enum | |
102 | { | |
103 | LISTEN_IPV4, | |
104 | LISTEN_IPV6, | |
105 | LISTEN_LAST, | |
106 | }; | |
107 | ||
108 | /* IPv4 and IPv6 */ | |
109 | static struct opm_listener listeners[LISTEN_LAST]; | |
110 | ||
111 | static inline protocol_t | |
112 | get_protocol_from_string(const char *str) | |
113 | { | |
114 | if(strcasecmp(str, "socks4") == 0) | |
115 | return PROTO_SOCKS4; | |
116 | else if(strcasecmp(str, "socks5") == 0) | |
117 | return PROTO_SOCKS5; | |
118 | else if(strcasecmp(str, "httpconnect") == 0) | |
119 | return PROTO_HTTP_CONNECT; | |
120 | else if(strcasecmp(str, "httpsconnect") == 0) | |
121 | return PROTO_HTTPS_CONNECT; | |
122 | else | |
123 | return PROTO_NONE; | |
124 | } | |
125 | ||
126 | static inline struct opm_proxy * | |
127 | find_proxy_scanner(protocol_t proto, uint16_t port) | |
128 | { | |
129 | rb_dlink_node *ptr; | |
130 | ||
131 | RB_DLINK_FOREACH(ptr, proxy_scanners.head) | |
132 | { | |
133 | struct opm_proxy *proxy = ptr->data; | |
134 | ||
135 | if(proxy->proto == proto && proxy->port == port) | |
136 | return proxy; | |
137 | } | |
138 | ||
139 | return NULL; | |
140 | } | |
141 | ||
142 | /* This is called when an open proxy connects to us */ | |
143 | static void | |
144 | read_opm_reply(rb_fde_t *F, void *data) | |
145 | { | |
146 | rb_dlink_node *ptr; | |
147 | struct auth_client *auth = data; | |
148 | struct opm_lookup *lookup; | |
149 | char readbuf[OPM_READSIZE]; | |
150 | ssize_t len; | |
151 | ||
152 | lrb_assert(auth != NULL); | |
153 | lookup = get_provider_data(auth, SELF_PID); | |
154 | lrb_assert(lookup != NULL); | |
155 | ||
156 | if((len = rb_read(F, readbuf, sizeof(readbuf))) < 0 && rb_ignore_errno(errno)) | |
157 | { | |
158 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
159 | return; | |
160 | } | |
161 | else if(len <= 0) | |
162 | { | |
163 | /* Dead */ | |
164 | rb_close(F); | |
165 | return; | |
166 | } | |
167 | ||
168 | RB_DLINK_FOREACH(ptr, proxy_scanners.head) | |
169 | { | |
170 | struct opm_proxy *proxy = ptr->data; | |
171 | ||
172 | if(strncmp(proxy->note, readbuf, strlen(proxy->note)) == 0) | |
173 | { | |
174 | rb_dlink_node *ptr, *nptr; | |
175 | ||
176 | /* Cancel outstanding lookups */ | |
177 | RB_DLINK_FOREACH_SAFE(ptr, nptr, lookup->scans.head) | |
178 | { | |
179 | struct opm_scan *scan = ptr->data; | |
180 | ||
181 | rb_close(scan->F); | |
182 | rb_free(scan); | |
183 | } | |
184 | ||
185 | /* No longer needed, client is going away */ | |
186 | rb_free(lookup); | |
187 | ||
188 | reject_client(auth, SELF_PID, readbuf, "Open proxy detected"); | |
189 | break; | |
190 | } | |
191 | } | |
192 | ||
193 | rb_close(F); | |
194 | } | |
195 | ||
196 | static void | |
197 | accept_opm(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t len, void *data) | |
198 | { | |
199 | struct opm_listener *listener = data; | |
200 | struct rb_sockaddr_storage localaddr; | |
201 | unsigned int llen = sizeof(struct rb_sockaddr_storage); | |
202 | rb_dlink_node *ptr; | |
203 | ||
204 | if(status != 0 || listener == NULL) | |
205 | { | |
206 | rb_close(F); | |
207 | return; | |
208 | } | |
209 | ||
210 | if(getsockname(rb_get_fd(F), (struct sockaddr *)&localaddr, &llen)) | |
211 | { | |
212 | /* This can happen if the client goes away after accept */ | |
213 | rb_close(F); | |
214 | return; | |
215 | } | |
216 | ||
217 | /* Correlate connection with client(s) */ | |
218 | RB_DLINK_FOREACH(ptr, auth_clients.head) | |
219 | { | |
220 | struct auth_client *auth = ptr->data; | |
221 | ||
222 | if(GET_SS_FAMILY(&auth->c_addr) != GET_SS_FAMILY(&localaddr)) | |
223 | continue; | |
224 | ||
225 | /* Compare the addresses */ | |
226 | switch(GET_SS_FAMILY(&localaddr)) | |
227 | { | |
228 | case AF_INET: | |
229 | { | |
230 | struct sockaddr_in *s = (struct sockaddr_in *)&localaddr, *c = (struct sockaddr_in *)&auth->c_addr; | |
231 | ||
232 | if(s->sin_addr.s_addr == c->sin_addr.s_addr) | |
233 | { | |
234 | /* Match... check if it's real */ | |
235 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
236 | return; | |
237 | } | |
238 | break; | |
239 | } | |
240 | #ifdef RB_IPV6 | |
241 | case AF_INET6: | |
242 | { | |
243 | struct sockaddr_in6 *s = (struct sockaddr_in6 *)&localaddr, *c = (struct sockaddr_in6 *)&auth->c_addr; | |
244 | ||
245 | if(IN6_ARE_ADDR_EQUAL(&s->sin6_addr, &c->sin6_addr)) | |
246 | { | |
247 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
248 | return; | |
249 | } | |
250 | break; | |
251 | } | |
252 | #endif | |
253 | default: | |
254 | warn_opers(L_CRIT, "OPM: unknown address type in listen function"); | |
255 | exit(EX_PROVIDER_ERROR); | |
256 | } | |
257 | } | |
258 | ||
259 | /* We don't care about the socket if we get here */ | |
260 | rb_close(F); | |
261 | } | |
262 | ||
263 | /* Scanners */ | |
264 | ||
265 | static void | |
266 | opm_connected(rb_fde_t *F, int error, void *data) | |
267 | { | |
268 | struct opm_scan *scan = data; | |
269 | struct opm_proxy *proxy = scan->proxy; | |
270 | struct auth_client *auth = scan->auth; | |
271 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
272 | ||
273 | if(error || !opm_enable) | |
274 | { | |
275 | //notice_client(scan->auth->cid, "*** Scan not connected: %s", proxy->note); | |
276 | goto end; | |
277 | } | |
278 | ||
279 | switch(GET_SS_FAMILY(&auth->c_addr)) | |
280 | { | |
281 | case AF_INET: | |
282 | if(listeners[LISTEN_IPV4].F == NULL) | |
283 | /* They cannot respond to us */ | |
284 | goto end; | |
285 | ||
286 | break; | |
287 | #ifdef RB_IPV6 | |
288 | case AF_INET6: | |
289 | if(!proxy->ipv6) | |
290 | /* Welp, too bad */ | |
291 | goto end; | |
292 | ||
293 | if(listeners[LISTEN_IPV6].F == NULL) | |
294 | /* They cannot respond to us */ | |
295 | goto end; | |
296 | ||
297 | break; | |
298 | #endif | |
299 | default: | |
300 | goto end; | |
301 | } | |
302 | ||
303 | proxy->callback(scan); | |
304 | ||
305 | end: | |
306 | rb_close(scan->F); | |
307 | rb_dlinkDelete(&scan->node, &lookup->scans); | |
308 | rb_free(scan); | |
309 | } | |
310 | ||
311 | static void | |
312 | socks4_connected(struct opm_scan *scan) | |
313 | { | |
314 | struct auth_client *auth = scan->auth; | |
315 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
316 | uint8_t sendbuf[9]; /* Size we're building */ | |
317 | uint8_t *c = sendbuf; | |
318 | ||
319 | memcpy(c, "\x04\x01", 2); c += 2; /* Socks version 4, connect command */ | |
320 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_port), 2); c += 2; /* Port */ | |
321 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_addr.s_addr), 4); c += 4; /* Address */ | |
322 | *c = '\x00'; /* No userid */ | |
323 | ||
324 | /* Send header */ | |
325 | if(rb_write(scan->F, sendbuf, sizeof(sendbuf)) < 0) | |
326 | return; | |
327 | ||
328 | /* Send note */ | |
329 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) < 0) | |
330 | return; | |
331 | } | |
332 | ||
333 | static void | |
334 | socks5_connected(struct opm_scan *scan) | |
335 | { | |
336 | struct auth_client *auth = scan->auth; | |
337 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
338 | uint8_t sendbuf[25]; /* Size we're building */ | |
339 | uint8_t *c = sendbuf; | |
340 | ||
341 | auth = scan->auth; | |
342 | lookup = get_provider_data(auth, SELF_PID); | |
343 | ||
344 | /* Build the version header and socks request | |
345 | * version header (3 bytes): version, number of auth methods, auth type (0 for none) | |
346 | * connect req (3 bytes): version, command (1 = connect), reserved (0) | |
347 | */ | |
348 | memcpy(c, "\x05\x01\x00\x05\x01\x00", 6); c += 6; | |
349 | ||
350 | switch(GET_SS_FAMILY(&auth->c_addr)) | |
351 | { | |
352 | case AF_INET: | |
353 | *(c++) = '\x01'; /* Address type (1 = IPv4) */ | |
354 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_addr.s_addr), 4); c += 4; /* Address */ | |
355 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_port), 2); c += 2; /* Port */ | |
356 | break; | |
357 | #ifdef RB_IPV6 | |
358 | case AF_INET6: | |
359 | *(c++) = '\x04'; /* Address type (4 = IPv6) */ | |
360 | memcpy(c, ((struct sockaddr_in6 *)&scan->listener->addr)->sin6_addr.s6_addr, 16); c += 16; /* Address */ | |
361 | memcpy(c, &(((struct sockaddr_in6 *)&scan->listener->addr)->sin6_port), 2); c += 2; /* Port */ | |
362 | break; | |
363 | #endif | |
364 | default: | |
365 | return; | |
366 | } | |
367 | ||
368 | /* Send header */ | |
369 | if(rb_write(scan->F, sendbuf, (size_t)(sendbuf - c)) <= 0) | |
370 | return; | |
371 | ||
372 | /* Now the note in a separate write */ | |
373 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) <= 0) | |
374 | return; | |
375 | } | |
376 | ||
377 | static void | |
378 | http_connect_connected(struct opm_scan *scan) | |
379 | { | |
380 | struct auth_client *auth = scan->auth; | |
381 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
382 | char sendbuf[128]; /* A bit bigger than we need but better safe than sorry */ | |
383 | char *c = sendbuf; | |
384 | ||
385 | /* Simple enough to build */ | |
386 | snprintf(sendbuf, sizeof(sendbuf), "CONNECT %s:%hu HTTP/1.0\r\n\r\n", scan->listener->ip, scan->listener->port); | |
387 | ||
388 | /* Send request */ | |
389 | if(rb_write(scan->F, sendbuf, strlen(sendbuf)) <= 0) | |
390 | return; | |
391 | ||
392 | /* Now the note in a separate write */ | |
393 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) <= 0) | |
394 | return; | |
395 | ||
396 | /* MiroTik needs this, and as a separate write */ | |
397 | if(rb_write(scan->F, "\r\n", 2) <= 0) | |
398 | return; | |
399 | } | |
400 | ||
401 | /* Establish connections */ | |
402 | static inline void | |
403 | establish_connection(struct auth_client *auth, struct opm_proxy *proxy) | |
404 | { | |
405 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
406 | struct opm_scan *scan = rb_malloc(sizeof(struct opm_scan)); | |
407 | struct opm_listener *listener; | |
408 | struct rb_sockaddr_storage c_a, l_a; | |
409 | int opt = 1; | |
410 | ||
411 | lrb_assert(lookup != NULL); | |
412 | ||
413 | #ifdef RB_IPV6 | |
414 | if(GET_SS_FAMILY(&auth->c_addr) == AF_INET6) | |
415 | { | |
416 | if(proxy->proto == PROTO_SOCKS4) | |
417 | { | |
418 | /* SOCKS4 doesn't support IPv6 */ | |
419 | rb_free(scan); | |
420 | return; | |
421 | } | |
422 | listener = &listeners[LISTEN_IPV6]; | |
423 | } | |
424 | else | |
425 | #endif | |
426 | listener = &listeners[LISTEN_IPV4]; | |
427 | ||
428 | if(listener->F == NULL) | |
429 | { | |
430 | /* We can't respond */ | |
431 | rb_free(scan); | |
432 | return; | |
433 | } | |
434 | ||
435 | c_a = auth->c_addr; /* Client */ | |
436 | l_a = listener->addr; /* Listener (connect using its IP) */ | |
437 | ||
438 | scan->auth = auth; | |
439 | scan->proxy = proxy; | |
440 | scan->listener = listener; | |
441 | if((scan->F = rb_socket(GET_SS_FAMILY(&auth->c_addr), SOCK_STREAM, 0, proxy->note)) == NULL) | |
442 | { | |
443 | warn_opers(L_WARN, "OPM: could not create OPM socket (proto %s): %s", proxy->note, strerror(errno)); | |
444 | rb_free(scan); | |
445 | return; | |
446 | } | |
447 | ||
448 | /* Disable Nagle's algorithim - buffering could affect scans */ | |
449 | (void)setsockopt(rb_get_fd(scan->F), IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt)); | |
450 | ||
451 | SET_SS_PORT(&l_a, 0); | |
452 | SET_SS_PORT(&c_a, htons(proxy->port)); | |
453 | ||
454 | rb_dlinkAdd(scan, &scan->node, &lookup->scans); | |
455 | ||
456 | if(!proxy->ssl) | |
457 | rb_connect_tcp(scan->F, | |
458 | (struct sockaddr *)&c_a, | |
459 | (struct sockaddr *)&l_a, | |
460 | opm_connected, scan, opm_timeout); | |
461 | else | |
462 | rb_connect_tcp_ssl(scan->F, | |
463 | (struct sockaddr *)&c_a, | |
464 | (struct sockaddr *)&l_a, | |
465 | opm_connected, scan, opm_timeout); | |
466 | } | |
467 | ||
468 | static bool | |
469 | create_listener(const char *ip, uint16_t port) | |
470 | { | |
471 | struct opm_listener *listener; | |
472 | struct rb_sockaddr_storage addr; | |
473 | rb_dlink_node *ptr, *nptr; | |
474 | rb_fde_t *F; | |
475 | int opt = 1; | |
476 | ||
477 | if(!rb_inet_pton_sock(ip, (struct sockaddr *)&addr)) | |
478 | { | |
479 | warn_opers(L_CRIT, "OPM: got a bad listener: %s:%hu", ip, port); | |
480 | exit(EX_PROVIDER_ERROR); | |
481 | } | |
482 | ||
483 | SET_SS_PORT(&addr, htons(port)); | |
484 | ||
485 | #ifdef RB_IPV6 | |
486 | if(GET_SS_FAMILY(&addr) == AF_INET6) | |
487 | { | |
488 | struct sockaddr_in6 *a1, *a2; | |
489 | ||
490 | listener = &listeners[LISTEN_IPV6]; | |
491 | ||
492 | a1 = (struct sockaddr_in6 *)&addr; | |
493 | a2 = (struct sockaddr_in6 *)&listener->addr; | |
494 | ||
495 | if(IN6_ARE_ADDR_EQUAL(&a1->sin6_addr, &a2->sin6_addr) && | |
496 | GET_SS_PORT(&addr) == GET_SS_PORT(&listener->addr) && | |
497 | listener->F != NULL) | |
498 | { | |
499 | /* Listener already exists */ | |
500 | return false; | |
501 | } | |
502 | } | |
503 | else | |
504 | #endif | |
505 | { | |
506 | struct sockaddr_in *a1, *a2; | |
507 | ||
508 | listener = &listeners[LISTEN_IPV4]; | |
509 | ||
510 | a1 = (struct sockaddr_in *)&addr; | |
511 | a2 = (struct sockaddr_in *)&listener->addr; | |
512 | ||
513 | if(a1->sin_addr.s_addr == a2->sin_addr.s_addr && | |
514 | GET_SS_PORT(&addr) == GET_SS_PORT(&listener->addr) && | |
515 | listener->F != NULL) | |
516 | { | |
517 | /* Listener already exists */ | |
518 | return false; | |
519 | } | |
520 | } | |
521 | ||
522 | if((F = rb_socket(GET_SS_FAMILY(&addr), SOCK_STREAM, 0, "OPM listener socket")) == NULL) | |
523 | { | |
524 | /* This shouldn't fail, or we have big problems... */ | |
525 | warn_opers(L_CRIT, "OPM: cannot create socket: %s", strerror(errno)); | |
526 | exit(EX_PROVIDER_ERROR); | |
527 | } | |
528 | ||
529 | if(setsockopt(rb_get_fd(F), SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt))) | |
530 | { | |
531 | /* This shouldn't fail either... */ | |
532 | warn_opers(L_CRIT, "OPM: cannot set options on socket: %s", strerror(errno)); | |
533 | exit(EX_PROVIDER_ERROR); | |
534 | } | |
535 | ||
536 | if(bind(rb_get_fd(F), (struct sockaddr *)&addr, GET_SS_LEN(&addr))) | |
537 | { | |
538 | /* Shit happens, let's not cripple authd over /this/ since it could be user error */ | |
539 | warn_opers(L_WARN, "OPM: cannot bind on socket: %s", strerror(errno)); | |
540 | rb_close(F); | |
541 | return false; | |
542 | } | |
543 | ||
544 | if(rb_listen(F, SOMAXCONN, false)) /* deferred accept could interfere with detection */ | |
545 | { | |
546 | /* Again, could be user error */ | |
547 | warn_opers(L_WARN, "OPM: cannot listen on socket: %s", strerror(errno)); | |
548 | rb_close(F); | |
549 | return false; | |
550 | } | |
551 | ||
552 | /* From this point forward we assume we have a listener */ | |
553 | ||
554 | if(listener->F != NULL) | |
555 | /* Close old listener */ | |
556 | rb_close(listener->F); | |
557 | ||
558 | listener->F = F; | |
559 | ||
560 | /* Cancel clients that may be on old listener | |
561 | * XXX - should rescan clients that need it | |
562 | */ | |
563 | RB_DLINK_FOREACH_SAFE(ptr, nptr, auth_clients.head) | |
564 | { | |
565 | struct auth_client *auth = ptr->data; | |
566 | opm_cancel(auth); | |
567 | } | |
568 | ||
569 | /* Copy data */ | |
570 | rb_strlcpy(listener->ip, ip, sizeof(listener->ip)); | |
571 | listener->port = port; | |
572 | listener->addr = addr; | |
573 | ||
574 | opm_enable = true; /* Implicitly set this to true for now if we have a listener */ | |
575 | rb_accept_tcp(listener->F, NULL, accept_opm, listener); | |
576 | return true; | |
577 | } | |
578 | ||
579 | static void | |
580 | opm_scan(struct auth_client *auth) | |
581 | { | |
582 | rb_dlink_node *ptr; | |
583 | struct opm_lookup *lookup; | |
584 | ||
585 | lrb_assert(auth != NULL); | |
586 | ||
587 | lookup = get_provider_data(auth, SELF_PID); | |
588 | set_provider_timeout_relative(auth, SELF_PID, opm_timeout); | |
589 | ||
590 | lookup->in_progress = true; | |
591 | ||
592 | RB_DLINK_FOREACH(ptr, proxy_scanners.head) | |
593 | { | |
594 | struct opm_proxy *proxy = ptr->data; | |
595 | //notice_client(auth->cid, "*** Scanning for proxy type %s", proxy->note); | |
596 | establish_connection(auth, proxy); | |
597 | } | |
598 | ||
599 | notice_client(auth->cid, "*** Scanning for open proxies..."); | |
600 | } | |
601 | ||
602 | /* This is called every time a provider is completed as long as we are marked not done */ | |
603 | static void | |
604 | opm_initiate(struct auth_client *auth, uint32_t provider) | |
605 | { | |
606 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
607 | uint32_t rdns_pid, ident_pid; | |
608 | ||
609 | lrb_assert(provider != SELF_PID); | |
610 | lrb_assert(!is_provider_done(auth, SELF_PID)); | |
611 | lrb_assert(rb_dlink_list_length(&proxy_scanners) > 0); | |
612 | ||
613 | if(lookup == NULL || lookup->in_progress) | |
614 | /* Nothing to do */ | |
615 | return; | |
616 | else if((!get_provider_id("rdns", &rdns_pid) || is_provider_done(auth, rdns_pid)) && | |
617 | (!get_provider_id("ident", &ident_pid) || is_provider_done(auth, ident_pid))) | |
618 | /* Don't start until ident and rdns are finished (or not loaded) */ | |
619 | return; | |
620 | else | |
621 | opm_scan(auth); | |
622 | } | |
623 | ||
624 | static bool | |
625 | opm_start(struct auth_client *auth) | |
626 | { | |
627 | uint32_t rdns_pid, ident_pid; | |
628 | ||
629 | lrb_assert(get_provider_data(auth, SELF_PID) == NULL); | |
630 | ||
631 | if(!opm_enable || rb_dlink_list_length(&proxy_scanners) == 0) | |
632 | /* Nothing to do... */ | |
633 | return true; | |
634 | ||
635 | set_provider_data(auth, SELF_PID, rb_malloc(sizeof(struct opm_lookup))); | |
636 | ||
637 | if((!get_provider_id("rdns", &rdns_pid) || is_provider_done(auth, rdns_pid)) && | |
638 | (!get_provider_id("ident", &ident_pid) || is_provider_done(auth, ident_pid))) | |
639 | { | |
640 | /* Don't start until ident and rdns are finished (or not loaded) */ | |
641 | opm_scan(auth); | |
642 | } | |
643 | ||
644 | set_provider_running(auth, SELF_PID); | |
645 | return true; | |
646 | } | |
647 | ||
648 | static void | |
649 | opm_cancel(struct auth_client *auth) | |
650 | { | |
651 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
652 | ||
653 | if(lookup != NULL) | |
654 | { | |
655 | rb_dlink_node *ptr, *nptr; | |
656 | ||
657 | notice_client(auth->cid, "*** Did not detect open proxies"); | |
658 | ||
659 | RB_DLINK_FOREACH_SAFE(ptr, nptr, lookup->scans.head) | |
660 | { | |
661 | struct opm_scan *scan = ptr->data; | |
662 | ||
663 | rb_close(scan->F); | |
664 | rb_free(scan); | |
665 | } | |
666 | ||
667 | rb_free(lookup); | |
668 | ||
669 | set_provider_data(auth, SELF_PID, NULL); | |
670 | set_provider_timeout_absolute(auth, SELF_PID, 0); | |
671 | provider_done(auth, SELF_PID); | |
672 | } | |
673 | } | |
674 | ||
675 | static void | |
676 | opm_destroy(void) | |
677 | { | |
678 | rb_dlink_node *ptr, *nptr; | |
679 | ||
680 | /* Nuke all opm lookups */ | |
681 | RB_DLINK_FOREACH_SAFE(ptr, nptr, auth_clients.head) | |
682 | { | |
683 | struct auth_client *auth = ptr->data; | |
684 | opm_cancel(auth); | |
685 | } | |
686 | } | |
687 | ||
688 | ||
689 | static void | |
690 | add_conf_opm_timeout(const char *key __unused, int parc __unused, const char **parv) | |
691 | { | |
692 | int timeout = atoi(parv[0]); | |
693 | ||
694 | if(timeout < 0) | |
695 | { | |
696 | warn_opers(L_CRIT, "opm: opm timeout < 0 (value: %d)", timeout); | |
697 | return; | |
698 | } | |
699 | ||
700 | opm_timeout = timeout; | |
701 | } | |
702 | ||
703 | static void | |
704 | set_opm_enabled(const char *key __unused, int parc __unused, const char **parv) | |
705 | { | |
706 | bool enable = (*parv[0] == '1'); | |
707 | ||
708 | if(!enable) | |
709 | { | |
710 | if(listeners[LISTEN_IPV4].F != NULL || listeners[LISTEN_IPV6].F != NULL) | |
711 | { | |
712 | rb_dlink_node *ptr, *nptr; | |
713 | ||
714 | /* Close the listening socket */ | |
715 | if(listeners[LISTEN_IPV4].F != NULL) | |
716 | rb_close(listeners[LISTEN_IPV4].F); | |
717 | ||
718 | if(listeners[LISTEN_IPV6].F != NULL) | |
719 | rb_close(listeners[LISTEN_IPV6].F); | |
720 | ||
721 | listeners[LISTEN_IPV4].F = listeners[LISTEN_IPV6].F = NULL; | |
722 | ||
723 | RB_DLINK_FOREACH_SAFE(ptr, nptr, auth_clients.head) | |
724 | { | |
725 | struct auth_client *auth = ptr->data; | |
726 | opm_cancel(auth); | |
727 | } | |
728 | } | |
729 | } | |
730 | else | |
731 | { | |
732 | if(listeners[LISTEN_IPV4].ip[0] != '\0' && listeners[LISTEN_IPV4].port != 0) | |
733 | { | |
734 | if(listeners[LISTEN_IPV4].F == NULL) | |
735 | /* Pre-configured IP/port, just re-establish */ | |
736 | create_listener(listeners[LISTEN_IPV4].ip, listeners[LISTEN_IPV4].port); | |
737 | } | |
738 | ||
739 | if(listeners[LISTEN_IPV6].ip[0] != '\0' && listeners[LISTEN_IPV6].port != 0) | |
740 | { | |
741 | if(listeners[LISTEN_IPV6].F == NULL) | |
742 | /* Pre-configured IP/port, just re-establish */ | |
743 | create_listener(listeners[LISTEN_IPV6].ip, listeners[LISTEN_IPV6].port); | |
744 | } | |
745 | } | |
746 | ||
747 | opm_enable = enable; | |
748 | } | |
749 | ||
750 | static void | |
751 | set_opm_listener(const char *key __unused, int parc __unused, const char **parv) | |
752 | { | |
753 | const char *ip = parv[0]; | |
754 | int iport = atoi(parv[1]); | |
755 | ||
756 | if(iport > 65535 || iport <= 0) | |
757 | { | |
758 | warn_opers(L_CRIT, "OPM: got a bad listener: %s:%s", parv[0], parv[1]); | |
759 | exit(EX_PROVIDER_ERROR); | |
760 | } | |
761 | ||
762 | create_listener(ip, (uint16_t)iport); | |
763 | } | |
764 | ||
765 | static void | |
766 | create_opm_scanner(const char *key __unused, int parc __unused, const char **parv) | |
767 | { | |
768 | int iport = atoi(parv[1]); | |
769 | struct opm_proxy *proxy = rb_malloc(sizeof(struct opm_proxy)); | |
770 | ||
771 | if(iport <= 0 || iport > 65535) | |
772 | { | |
773 | warn_opers(L_CRIT, "OPM: got a bad scanner: %s (port %s)", parv[0], parv[1]); | |
774 | exit(EX_PROVIDER_ERROR); | |
775 | } | |
776 | ||
777 | proxy->port = (uint16_t)iport; | |
778 | ||
779 | switch((proxy->proto = get_protocol_from_string(parv[0]))) | |
780 | { | |
781 | case PROTO_SOCKS4: | |
782 | snprintf(proxy->note, sizeof(proxy->note), "socks4:%hu", proxy->port); | |
783 | proxy->ssl = false; | |
784 | proxy->callback = socks4_connected; | |
785 | break; | |
786 | case PROTO_SOCKS5: | |
787 | snprintf(proxy->note, sizeof(proxy->note), "socks5:%hu", proxy->port); | |
788 | proxy->ssl = false; | |
789 | proxy->callback = socks5_connected; | |
790 | break; | |
791 | case PROTO_HTTP_CONNECT: | |
792 | snprintf(proxy->note, sizeof(proxy->note), "httpconnect:%hu", proxy->port); | |
793 | proxy->ssl = false; | |
794 | proxy->callback = http_connect_connected; | |
795 | break; | |
796 | case PROTO_HTTPS_CONNECT: | |
797 | snprintf(proxy->note, sizeof(proxy->note), "httpsconnect:%hu", proxy->port); | |
798 | proxy->callback = http_connect_connected; | |
799 | proxy->ssl = true; | |
800 | break; | |
801 | default: | |
802 | warn_opers(L_CRIT, "OPM: got an unknown proxy type: %s (port %hu)", parv[0], proxy->port); | |
803 | exit(EX_PROVIDER_ERROR); | |
804 | } | |
805 | ||
806 | if(find_proxy_scanner(proxy->proto, proxy->port) != NULL) | |
807 | { | |
808 | warn_opers(L_CRIT, "OPM: got a duplicate scanner: %s (port %hu)", parv[0], proxy->port); | |
809 | exit(EX_PROVIDER_ERROR); | |
810 | } | |
811 | ||
812 | rb_dlinkAdd(proxy, &proxy->node, &proxy_scanners); | |
813 | } | |
814 | ||
815 | static void | |
816 | delete_opm_scanner(const char *key __unused, int parc __unused, const char **parv) | |
817 | { | |
818 | struct opm_proxy *proxy; | |
819 | protocol_t proto = get_protocol_from_string(parv[0]); | |
820 | int iport = atoi(parv[1]); | |
821 | rb_dlink_node *ptr, *nptr; | |
822 | ||
823 | if(iport <= 0 || iport > 65535) | |
824 | { | |
825 | warn_opers(L_CRIT, "OPM: got a bad scanner to delete: %s (port %s)", parv[0], parv[1]); | |
826 | exit(EX_PROVIDER_ERROR); | |
827 | } | |
828 | ||
829 | if(proto == PROTO_NONE) | |
830 | { | |
831 | warn_opers(L_CRIT, "OPM: got an unknown proxy type to delete: %s (port %d)", parv[0], iport); | |
832 | exit(EX_PROVIDER_ERROR); | |
833 | } | |
834 | ||
835 | if((proxy = find_proxy_scanner(proto, (uint16_t)iport)) == NULL) | |
836 | { | |
837 | warn_opers(L_CRIT, "OPM: cannot find proxy to delete: %s (port %d)", parv[0], iport); | |
838 | exit(EX_PROVIDER_ERROR); | |
839 | } | |
840 | ||
841 | /* Abort remaining clients on this scanner */ | |
842 | RB_DLINK_FOREACH_SAFE(ptr, nptr, auth_clients.head) | |
843 | { | |
844 | struct auth_client *auth = ptr->data; | |
845 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
846 | rb_dlink_node *optr; | |
847 | ||
848 | if(lookup == NULL) | |
849 | continue; | |
850 | ||
851 | RB_DLINK_FOREACH(optr, lookup->scans.head) | |
852 | { | |
853 | struct opm_scan *scan = optr->data; | |
854 | ||
855 | if(scan->proxy->port == proxy->port && scan->proxy->proto == proxy->proto) | |
856 | { | |
857 | /* Match */ | |
858 | rb_dlinkDelete(&scan->node, &lookup->scans); | |
859 | rb_free(scan); | |
860 | ||
861 | if(rb_dlink_list_length(&lookup->scans) == 0) | |
862 | opm_cancel(auth); | |
863 | ||
864 | break; | |
865 | } | |
866 | } | |
867 | } | |
868 | ||
869 | rb_dlinkDelete(&proxy->node, &proxy_scanners); | |
870 | rb_free(proxy); | |
871 | ||
872 | if(rb_dlink_list_length(&proxy_scanners) == 0) | |
873 | opm_enable = false; | |
874 | } | |
875 | ||
876 | static void | |
877 | delete_opm_scanner_all(const char *key __unused, int parc __unused, const char **parv __unused) | |
878 | { | |
879 | rb_dlink_node *ptr, *nptr; | |
880 | ||
881 | RB_DLINK_FOREACH_SAFE(ptr, nptr, proxy_scanners.head) | |
882 | { | |
883 | rb_free(ptr->data); | |
884 | rb_dlinkDelete(ptr, &proxy_scanners); | |
885 | } | |
886 | ||
887 | RB_DLINK_FOREACH_SAFE(ptr, nptr, auth_clients.head) | |
888 | { | |
889 | struct auth_client *auth = ptr->data; | |
890 | opm_cancel(auth); | |
891 | } | |
892 | ||
893 | opm_enable = false; | |
894 | } | |
895 | ||
896 | static void | |
897 | delete_opm_listener_all(const char *key __unused, int parc __unused, const char **parv __unused) | |
898 | { | |
899 | if(listeners[LISTEN_IPV4].F != NULL) | |
900 | rb_close(listeners[LISTEN_IPV4].F); | |
901 | ||
902 | #ifdef RB_IPV6 | |
903 | if(listeners[LISTEN_IPV6].F != NULL) | |
904 | rb_close(listeners[LISTEN_IPV6].F); | |
905 | #endif | |
906 | ||
907 | memset(&listeners, 0, sizeof(listeners)); | |
908 | } | |
909 | ||
910 | ||
911 | struct auth_opts_handler opm_options[] = | |
912 | { | |
913 | { "opm_timeout", 1, add_conf_opm_timeout }, | |
914 | { "opm_enabled", 1, set_opm_enabled }, | |
915 | { "opm_listener", 2, set_opm_listener }, | |
916 | { "opm_listener_del_all", 0, delete_opm_listener_all }, | |
917 | { "opm_scanner", 2, create_opm_scanner }, | |
918 | { "opm_scanner_del", 2, delete_opm_scanner }, | |
919 | { "opm_scanner_del_all", 0, delete_opm_scanner_all }, | |
920 | { NULL, 0, NULL }, | |
921 | }; | |
922 | ||
923 | struct auth_provider opm_provider = | |
924 | { | |
925 | .name = "opm", | |
926 | .letter = 'O', | |
927 | .destroy = opm_destroy, | |
928 | .start = opm_start, | |
929 | .cancel = opm_cancel, | |
930 | .timeout = opm_cancel, | |
931 | .completed = opm_initiate, | |
932 | .opt_handlers = opm_options, | |
933 | }; |