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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 "rb_lib.h" | |
22 | #include "stdinc.h" | |
23 | #include "setup.h" | |
24 | #include "authd.h" | |
25 | #include "notice.h" | |
26 | #include "provider.h" | |
27 | ||
28 | #define OPM_READSIZE 128 | |
29 | ||
30 | typedef enum protocol_t | |
31 | { | |
32 | PROTO_NONE, | |
33 | PROTO_SOCKS4, | |
34 | PROTO_SOCKS5, | |
35 | } protocol_t; | |
36 | ||
37 | struct opm_lookup | |
38 | { | |
39 | rb_dlink_list scans; /* List of scans */ | |
40 | }; | |
41 | ||
42 | struct opm_proxy | |
43 | { | |
44 | char note[16]; | |
45 | protocol_t proto; | |
46 | uint16_t port; | |
47 | ||
48 | rb_dlink_node node; | |
49 | }; | |
50 | ||
51 | struct opm_scan | |
52 | { | |
53 | struct auth_client *auth; | |
54 | ||
55 | struct opm_proxy *proxy; | |
56 | rb_fde_t *F; /* fd for scan */ | |
57 | ||
58 | rb_dlink_node node; | |
59 | }; | |
60 | ||
61 | struct opm_listener | |
62 | { | |
63 | char ip[HOSTIPLEN]; | |
64 | uint16_t port; | |
65 | struct rb_sockaddr_storage addr; | |
66 | rb_fde_t *F; | |
67 | }; | |
68 | ||
69 | /* Proxies that we scan for */ | |
70 | static rb_dlink_list proxy_scanners; | |
71 | ||
72 | static ACCB accept_opm; | |
73 | static PF read_opm_reply; | |
74 | ||
75 | static CNCB socks4_connected; | |
76 | static CNCB socks5_connected; | |
77 | ||
78 | static void opm_cancel(struct auth_client *auth); | |
79 | static bool create_listener(const char *ip, uint16_t port); | |
80 | ||
81 | static int opm_timeout = 10; | |
82 | static bool opm_enable = false; | |
83 | ||
84 | #define LISTEN_IPV4 0 | |
85 | #define LISTEN_IPV6 1 | |
86 | ||
87 | /* IPv4 and IPv6 */ | |
88 | static struct opm_listener listeners[2]; | |
89 | ||
90 | static inline protocol_t | |
91 | get_protocol_from_string(const char *string) | |
92 | { | |
93 | if(strcasecmp(string, "socks4") == 0) | |
94 | return PROTO_SOCKS4; | |
95 | else if(strcasecmp(string, "socks5") == 0) | |
96 | return PROTO_SOCKS5; | |
97 | else | |
98 | return PROTO_NONE; | |
99 | } | |
100 | ||
101 | static inline struct opm_proxy * | |
102 | find_proxy_scanner(protocol_t proto, uint16_t port) | |
103 | { | |
104 | rb_dlink_node *ptr; | |
105 | ||
106 | RB_DLINK_FOREACH(ptr, proxy_scanners.head) | |
107 | { | |
108 | struct opm_proxy *proxy = ptr->data; | |
109 | ||
110 | if(proxy->proto == proto && proxy->port == port) | |
111 | return proxy; | |
112 | } | |
113 | ||
114 | return NULL; | |
115 | } | |
116 | ||
117 | static void | |
118 | read_opm_reply(rb_fde_t *F, void *data) | |
119 | { | |
120 | rb_dlink_node *ptr; | |
121 | struct auth_client *auth = data; | |
122 | struct opm_lookup *lookup; | |
123 | char readbuf[OPM_READSIZE]; | |
124 | ssize_t len; | |
125 | ||
126 | if(auth == NULL || (lookup = auth->data[PROVIDER_OPM]) == NULL) | |
127 | { | |
128 | rb_close(F); | |
129 | return; | |
130 | } | |
131 | ||
132 | if((len = rb_read(F, readbuf, sizeof(readbuf))) < 0 && rb_ignore_errno(errno)) | |
133 | { | |
134 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
135 | return; | |
136 | } | |
137 | else if(len <= 0) | |
138 | { | |
139 | /* Dead */ | |
140 | rb_close(F); | |
141 | return; | |
142 | } | |
143 | ||
144 | RB_DLINK_FOREACH(ptr, proxy_scanners.head) | |
145 | { | |
146 | struct opm_proxy *proxy = ptr->data; | |
147 | ||
148 | if(strncmp(proxy->note, readbuf, sizeof(readbuf)) == 0) | |
149 | { | |
150 | rb_dlink_node *ptr, *nptr; | |
151 | ||
152 | /* Cancel outstanding lookups */ | |
153 | RB_DLINK_FOREACH_SAFE(ptr, nptr, lookup->scans.head) | |
154 | { | |
155 | struct opm_scan *scan = ptr->data; | |
156 | ||
157 | rb_close(scan->F); | |
158 | rb_free(scan); | |
159 | } | |
160 | ||
161 | /* No longer needed, client is going away */ | |
162 | rb_free(lookup); | |
163 | ||
164 | reject_client(auth, PROVIDER_OPM, readbuf, "Open proxy detected"); | |
165 | break; | |
166 | } | |
167 | } | |
168 | ||
169 | rb_close(F); | |
170 | } | |
171 | ||
172 | static void | |
173 | accept_opm(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t len, void *data) | |
174 | { | |
175 | struct auth_client *auth = NULL; | |
176 | struct opm_listener *listener = data; | |
177 | struct rb_sockaddr_storage localaddr; | |
178 | unsigned int llen = sizeof(struct rb_sockaddr_storage); | |
179 | rb_dictionary_iter iter; | |
180 | ||
181 | if(status != 0 || listener == NULL) | |
182 | { | |
183 | rb_close(F); | |
184 | return; | |
185 | } | |
186 | ||
187 | if(getsockname(rb_get_fd(F), (struct sockaddr *)&localaddr, &llen)) | |
188 | { | |
189 | /* This can happen if the client goes away after accept */ | |
190 | rb_close(F); | |
191 | return; | |
192 | } | |
193 | ||
194 | /* Correlate connection with client(s) */ | |
195 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
196 | { | |
197 | if(GET_SS_FAMILY(&auth->c_addr) != GET_SS_FAMILY(&localaddr)) | |
198 | continue; | |
199 | ||
200 | /* Compare the addresses */ | |
201 | switch(GET_SS_FAMILY(&localaddr)) | |
202 | { | |
203 | case AF_INET: | |
204 | { | |
205 | struct sockaddr_in *s = (struct sockaddr_in *)&localaddr, *c = (struct sockaddr_in *)&auth->c_addr; | |
206 | ||
207 | if(s->sin_addr.s_addr == c->sin_addr.s_addr) | |
208 | { | |
209 | /* Match... check if it's real */ | |
210 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
211 | return; | |
212 | } | |
213 | break; | |
214 | } | |
215 | #ifdef RB_IPV6 | |
216 | case AF_INET6: | |
217 | { | |
218 | struct sockaddr_in6 *s = (struct sockaddr_in6 *)&localaddr, *c = (struct sockaddr_in6 *)&auth->c_addr; | |
219 | ||
220 | if(IN6_ARE_ADDR_EQUAL(&s->sin6_addr, &c->sin6_addr)) | |
221 | { | |
222 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
223 | return; | |
224 | } | |
225 | break; | |
226 | } | |
227 | #endif | |
228 | default: | |
229 | warn_opers(L_CRIT, "OPM: unknown address type in listen function"); | |
230 | exit(EX_PROVIDER_ERROR); | |
231 | } | |
232 | } | |
233 | ||
234 | /* We don't care about the socket if we get here */ | |
235 | rb_close(F); | |
236 | } | |
237 | ||
238 | /* Scanners */ | |
239 | ||
240 | static void | |
241 | socks4_connected(rb_fde_t *F, int error, void *data) | |
242 | { | |
243 | struct opm_scan *scan = data; | |
244 | struct opm_lookup *lookup; | |
245 | struct auth_client *auth; | |
246 | uint8_t sendbuf[9]; /* Size we're building */ | |
247 | uint8_t *c = sendbuf; | |
248 | ssize_t ret; | |
249 | ||
250 | if(scan == NULL || (auth = scan->auth) == NULL || (lookup = auth->data[PROVIDER_OPM]) == NULL) | |
251 | return; | |
252 | ||
253 | if(error || !opm_enable) | |
254 | goto end; | |
255 | ||
256 | memcpy(c, "\x04\x01", 2); c += 2; /* Socks version 4, connect command */ | |
257 | ||
258 | switch(GET_SS_FAMILY(&auth->c_addr)) | |
259 | { | |
260 | case AF_INET: | |
261 | if(listeners[LISTEN_IPV4].F == NULL) | |
262 | /* They cannot respond to us */ | |
263 | goto end; | |
264 | ||
265 | memcpy(c, &(((struct sockaddr_in *)&listeners[LISTEN_IPV4].addr)->sin_port), 2); c += 2; /* Port */ | |
266 | memcpy(c, &(((struct sockaddr_in *)&listeners[LISTEN_IPV4].addr)->sin_addr.s_addr), 4); c += 4; /* Address */ | |
267 | break; | |
268 | #ifdef RB_IPV6 | |
269 | case AF_INET6: | |
270 | /* socks4 doesn't support IPv6 */ | |
271 | #endif | |
272 | default: | |
273 | goto end; | |
274 | } | |
275 | ||
276 | *c = '\x00'; /* No userid */ | |
277 | ||
278 | /* Send header */ | |
279 | if(rb_write(scan->F, sendbuf, sizeof(sendbuf)) < 0) | |
280 | goto end; | |
281 | ||
282 | /* Send note */ | |
283 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) < 0) | |
284 | goto end; | |
285 | ||
286 | end: | |
287 | rb_close(scan->F); | |
288 | rb_dlinkDelete(&scan->node, &lookup->scans); | |
289 | rb_free(scan); | |
290 | } | |
291 | ||
292 | static void | |
293 | socks5_connected(rb_fde_t *F, int error, void *data) | |
294 | { | |
295 | struct opm_scan *scan = data; | |
296 | struct opm_lookup *lookup; | |
297 | struct opm_listener *listener; | |
298 | struct auth_client *auth; | |
299 | uint8_t sendbuf[25]; /* Size we're building */ | |
300 | uint8_t *c = sendbuf; | |
301 | ssize_t ret; | |
302 | ||
303 | if(scan == NULL || (auth = scan->auth) == NULL || (lookup = auth->data[PROVIDER_OPM]) == NULL) | |
304 | return; | |
305 | ||
306 | if(error || !opm_enable) | |
307 | goto end; | |
308 | ||
309 | /* Build the version header and socks request | |
310 | * version header (3 bytes): version, number of auth methods, auth type (0 for none) | |
311 | * connect req (3 bytes): version, command (1 = connect), reserved (0) | |
312 | */ | |
313 | memcpy(c, "\x05\x01\x00\x05\x01\x00", 6); c += 6; | |
314 | ||
315 | switch(GET_SS_FAMILY(&auth->c_addr)) | |
316 | { | |
317 | case AF_INET: | |
318 | listener = &listeners[LISTEN_IPV4]; | |
319 | if(!listener->F) | |
320 | goto end; | |
321 | ||
322 | *(c++) = '\x01'; /* Address type (1 = IPv4) */ | |
323 | memcpy(c, &(((struct sockaddr_in *)&listener->addr)->sin_addr.s_addr), 4); c += 4;/* Address */ | |
324 | memcpy(c, &(((struct sockaddr_in *)&listener->addr)->sin_port), 2); c += 2; /* Port */ | |
325 | break; | |
326 | #ifdef RB_IPV6 | |
327 | case AF_INET6: | |
328 | listener = &listeners[LISTEN_IPV6]; | |
329 | if(!listener->F) | |
330 | goto end; | |
331 | ||
332 | *(c++) = '\x04'; /* Address type (4 = IPv6) */ | |
333 | memcpy(c, ((struct sockaddr_in6 *)&listener->addr)->sin6_addr.s6_addr, 16); c += 16; /* Address */ | |
334 | memcpy(c, &(((struct sockaddr_in6 *)&listener->addr)->sin6_port), 2); c += 2; /* Port */ | |
335 | break; | |
336 | #endif | |
337 | default: | |
338 | goto end; | |
339 | } | |
340 | ||
341 | /* Send header */ | |
342 | if(rb_write(scan->F, sendbuf, (size_t)(sendbuf - c)) <= 0) | |
343 | goto end; | |
344 | ||
345 | /* Now the note in a separate write */ | |
346 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) <= 0) | |
347 | goto end; | |
348 | ||
349 | end: | |
350 | rb_close(scan->F); | |
351 | rb_dlinkDelete(&scan->node, &lookup->scans); | |
352 | rb_free(scan); | |
353 | } | |
354 | ||
355 | /* Establish connections */ | |
356 | static inline void | |
357 | establish_connection(struct auth_client *auth, struct opm_proxy *proxy) | |
358 | { | |
359 | struct opm_lookup *lookup = auth->data[PROVIDER_OPM]; | |
360 | struct opm_listener *listener; | |
361 | struct opm_scan *scan = rb_malloc(sizeof(struct opm_scan)); | |
362 | struct rb_sockaddr_storage c_a, l_a; | |
363 | int opt = 1; | |
364 | CNCB *callback; | |
365 | ||
366 | switch(proxy->proto) | |
367 | { | |
368 | case PROTO_SOCKS4: | |
369 | #ifdef RB_IPV6 | |
370 | if(GET_SS_FAMILY(&auth->c_addr) == AF_INET6) | |
371 | { | |
372 | rb_free(scan); | |
373 | return; | |
374 | } | |
375 | #endif | |
376 | callback = socks4_connected; | |
377 | break; | |
378 | case PROTO_SOCKS5: | |
379 | callback = socks5_connected; | |
380 | break; | |
381 | default: | |
382 | return; | |
383 | } | |
384 | ||
385 | #ifdef RB_IPV6 | |
386 | if(GET_SS_FAMILY(&auth->c_addr) == AF_INET6) | |
387 | listener = &listeners[LISTEN_IPV6]; | |
388 | else | |
389 | #endif | |
390 | listener = &listeners[LISTEN_IPV4]; | |
391 | ||
392 | c_a = auth->c_addr; /* Client */ | |
393 | l_a = listener->addr; /* Listener */ | |
394 | ||
395 | scan->auth = auth; | |
396 | scan->proxy = proxy; | |
397 | if((scan->F = rb_socket(GET_SS_FAMILY(&auth->c_addr), SOCK_STREAM, 0, proxy->note)) == NULL) | |
398 | { | |
399 | warn_opers(L_CRIT, "OPM: could not create OPM socket (proto %s): %s", proxy->note, strerror(errno)); | |
400 | rb_free(scan); | |
401 | return; | |
402 | } | |
403 | ||
404 | /* Disable Nagle's algorithim - buffering could affect scans */ | |
405 | (void)setsockopt(rb_get_fd(scan->F), IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt)); | |
406 | ||
407 | SET_SS_PORT(&l_a, 0); | |
408 | SET_SS_PORT(&c_a, htons(proxy->port)); | |
409 | ||
410 | rb_dlinkAdd(scan, &scan->node, &lookup->scans); | |
411 | rb_connect_tcp(scan->F, | |
412 | (struct sockaddr *)&c_a, | |
413 | (struct sockaddr *)&l_a, | |
414 | GET_SS_LEN(&l_a), | |
415 | callback, scan, opm_timeout); | |
416 | } | |
417 | ||
418 | static bool | |
419 | create_listener(const char *ip, uint16_t port) | |
420 | { | |
421 | struct auth_client *auth; | |
422 | struct opm_listener *listener; | |
423 | struct rb_sockaddr_storage addr; | |
424 | rb_dictionary_iter iter; | |
425 | rb_fde_t *F; | |
426 | int opt = 1; | |
427 | ||
428 | if(!rb_inet_pton_sock(ip, (struct sockaddr *)&addr)) | |
429 | { | |
430 | warn_opers(L_CRIT, "OPM: got a bad listener: %s:%hu", ip, port); | |
431 | exit(EX_PROVIDER_ERROR); | |
432 | } | |
433 | ||
434 | #ifdef RB_IPV6 | |
435 | if(GET_SS_FAMILY(&addr) == AF_INET6) | |
436 | { | |
437 | struct sockaddr_in6 *a1, *a2; | |
438 | ||
439 | listener = &listeners[LISTEN_IPV6]; | |
440 | ||
441 | a1 = (struct sockaddr_in6 *)&addr; | |
442 | a2 = (struct sockaddr_in6 *)&listener->addr; | |
443 | ||
444 | if(IN6_ARE_ADDR_EQUAL(&a1->sin6_addr, &a2->sin6_addr) && | |
445 | GET_SS_PORT(&addr) == GET_SS_PORT(&listener->addr) && | |
446 | listener->F != NULL) | |
447 | { | |
448 | /* Listener already exists */ | |
449 | return false; | |
450 | } | |
451 | } | |
452 | else | |
453 | #endif | |
454 | { | |
455 | struct sockaddr_in *a1, *a2; | |
456 | ||
457 | listener = &listeners[LISTEN_IPV4]; | |
458 | ||
459 | a1 = (struct sockaddr_in *)&addr; | |
460 | a2 = (struct sockaddr_in *)&listener->addr; | |
461 | ||
462 | if(a1->sin_addr.s_addr == a2->sin_addr.s_addr && | |
463 | GET_SS_PORT(&addr) == GET_SS_PORT(&listener->addr) && | |
464 | listener->F != NULL) | |
465 | { | |
466 | /* Listener already exists */ | |
467 | return false; | |
468 | } | |
469 | } | |
470 | ||
471 | if((F = rb_socket(GET_SS_FAMILY(&addr), SOCK_STREAM, 0, "OPM listener socket")) == NULL) | |
472 | { | |
473 | /* This shouldn't fail, or we have big problems... */ | |
474 | warn_opers(L_CRIT, "OPM: cannot create socket: %s", strerror(errno)); | |
475 | exit(EX_PROVIDER_ERROR); | |
476 | } | |
477 | ||
478 | if(setsockopt(rb_get_fd(F), SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt))) | |
479 | { | |
480 | /* This shouldn't fail either... */ | |
481 | warn_opers(L_CRIT, "OPM: cannot set options on socket: %s", strerror(errno)); | |
482 | exit(EX_PROVIDER_ERROR); | |
483 | } | |
484 | ||
485 | /* Set up ports for binding */ | |
486 | #ifdef RB_IPV6 | |
487 | if(GET_SS_FAMILY(&addr) == AF_INET6) | |
488 | ((struct sockaddr_in6 *)&addr)->sin6_port = htons(port); | |
489 | else | |
490 | #endif | |
491 | ((struct sockaddr_in *)&addr)->sin_port = htons(port); | |
492 | ||
493 | if(bind(rb_get_fd(F), (struct sockaddr *)&addr, GET_SS_LEN(&addr))) | |
494 | { | |
495 | /* Shit happens, let's not cripple authd over /this/ since it could be user error */ | |
496 | warn_opers(L_WARN, "OPM: cannot bind on socket: %s", strerror(errno)); | |
497 | rb_close(F); | |
498 | return false; | |
499 | } | |
500 | ||
501 | if(rb_listen(F, SOMAXCONN, false)) /* deferred accept could interfere with detection */ | |
502 | { | |
503 | /* Again, could be user error */ | |
504 | warn_opers(L_WARN, "OPM: cannot listen on socket: %s", strerror(errno)); | |
505 | rb_close(F); | |
506 | return false; | |
507 | } | |
508 | ||
509 | /* From this point forward we assume we have a listener */ | |
510 | ||
511 | if(listener->F != NULL) | |
512 | /* Close old listener */ | |
513 | rb_close(listener->F); | |
514 | ||
515 | listener->F = F; | |
516 | ||
517 | /* Cancel clients that may be on old listener | |
518 | * XXX - should rescan clients that need it | |
519 | */ | |
520 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
521 | { | |
522 | opm_cancel(auth); | |
523 | } | |
524 | ||
525 | /* Copy data */ | |
526 | rb_strlcpy(listener->ip, ip, sizeof(listener->ip)); | |
527 | listener->port = port; | |
528 | listener->addr = addr; | |
529 | ||
530 | opm_enable = true; /* Implicitly set this to true for now if we have a listener */ | |
531 | rb_accept_tcp(listener->F, NULL, accept_opm, listener); | |
532 | return true; | |
533 | } | |
534 | ||
535 | ||
536 | static void | |
537 | opm_destroy(void) | |
538 | { | |
539 | struct auth_client *auth; | |
540 | rb_dictionary_iter iter; | |
541 | ||
542 | /* Nuke all opm lookups */ | |
543 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
544 | { | |
545 | opm_cancel(auth); | |
546 | } | |
547 | } | |
548 | ||
549 | static bool | |
550 | opm_start(struct auth_client *auth) | |
551 | { | |
552 | rb_dlink_node *ptr; | |
553 | struct opm_lookup *lookup = rb_malloc(sizeof(struct opm_lookup)); | |
554 | ||
555 | if(!opm_enable || !rb_dlink_list_length(&proxy_scanners)) | |
556 | { | |
557 | notice_client(auth->cid, "*** Proxy scanning disabled, not scanning"); | |
558 | return true; | |
559 | } | |
560 | ||
561 | auth->data[PROVIDER_OPM] = lookup = rb_malloc(sizeof(struct opm_lookup)); | |
562 | auth->timeout[PROVIDER_OPM] = rb_current_time() + opm_timeout; | |
563 | ||
564 | RB_DLINK_FOREACH(ptr, proxy_scanners.head) | |
565 | { | |
566 | struct opm_proxy *proxy = ptr->data; | |
567 | establish_connection(auth, proxy); | |
568 | } | |
569 | ||
570 | notice_client(auth->cid, "*** Scanning for open proxies..."); | |
571 | set_provider_on(auth, PROVIDER_OPM); | |
572 | ||
573 | return true; | |
574 | } | |
575 | ||
576 | static void | |
577 | opm_cancel(struct auth_client *auth) | |
578 | { | |
579 | struct opm_lookup *lookup = auth->data[PROVIDER_OPM]; | |
580 | ||
581 | if(lookup != NULL) | |
582 | { | |
583 | rb_dlink_node *ptr, *nptr; | |
584 | ||
585 | notice_client(auth->cid, "*** Did not detect open proxies"); | |
586 | ||
587 | RB_DLINK_FOREACH_SAFE(ptr, nptr, lookup->scans.head) | |
588 | { | |
589 | struct opm_scan *scan = ptr->data; | |
590 | ||
591 | rb_close(scan->F); | |
592 | rb_free(scan); | |
593 | } | |
594 | ||
595 | rb_free(lookup); | |
596 | provider_done(auth, PROVIDER_OPM); | |
597 | } | |
598 | } | |
599 | ||
600 | static void | |
601 | add_conf_opm_timeout(const char *key __unused, int parc __unused, const char **parv) | |
602 | { | |
603 | int timeout = atoi(parv[0]); | |
604 | ||
605 | if(timeout < 0) | |
606 | { | |
607 | warn_opers(L_CRIT, "opm: opm timeout < 0 (value: %d)", timeout); | |
608 | return; | |
609 | } | |
610 | ||
611 | opm_timeout = timeout; | |
612 | } | |
613 | ||
614 | static void | |
615 | set_opm_enabled(const char *key __unused, int parc __unused, const char **parv) | |
616 | { | |
617 | bool enable = (*parv[0] == '1'); | |
618 | ||
619 | if(!enable) | |
620 | { | |
621 | if(listeners[LISTEN_IPV4].F != NULL || listeners[LISTEN_IPV6].F != NULL) | |
622 | { | |
623 | struct auth_client *auth; | |
624 | rb_dictionary_iter iter; | |
625 | ||
626 | /* Close the listening socket */ | |
627 | if(listeners[LISTEN_IPV4].F != NULL) | |
628 | rb_close(listeners[LISTEN_IPV4].F); | |
629 | ||
630 | if(listeners[LISTEN_IPV6].F != NULL) | |
631 | rb_close(listeners[LISTEN_IPV6].F); | |
632 | ||
633 | listeners[LISTEN_IPV4].F = listeners[LISTEN_IPV6].F = NULL; | |
634 | ||
635 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
636 | { | |
637 | opm_cancel(auth); | |
638 | } | |
639 | } | |
640 | } | |
641 | else | |
642 | { | |
643 | if(listeners[LISTEN_IPV4].ip[0] != '\0' && listeners[LISTEN_IPV4].port != 0) | |
644 | { | |
645 | lrb_assert(listeners[LISTEN_IPV4].F == NULL); | |
646 | ||
647 | /* Pre-configured IP/port, just re-establish */ | |
648 | create_listener(listeners[LISTEN_IPV4].ip, listeners[LISTEN_IPV4].port); | |
649 | } | |
650 | ||
651 | if(listeners[LISTEN_IPV6].ip[0] != '\0' && listeners[LISTEN_IPV6].port != 0) | |
652 | { | |
653 | lrb_assert(listeners[LISTEN_IPV6].F == NULL); | |
654 | ||
655 | /* Pre-configured IP/port, just re-establish */ | |
656 | create_listener(listeners[LISTEN_IPV6].ip, listeners[LISTEN_IPV6].port); | |
657 | } | |
658 | } | |
659 | ||
660 | opm_enable = enable; | |
661 | } | |
662 | ||
663 | static void | |
664 | set_opm_listener(const char *key __unused, int parc __unused, const char **parv) | |
665 | { | |
666 | const char *ip = parv[0]; | |
667 | int iport = atoi(parv[1]); | |
668 | ||
669 | if(iport > 65535 || iport <= 0) | |
670 | { | |
671 | warn_opers(L_CRIT, "OPM: got a bad listener: %s:%s", parv[0], parv[1]); | |
672 | exit(EX_PROVIDER_ERROR); | |
673 | } | |
674 | ||
675 | create_listener(ip, (uint16_t)iport); | |
676 | } | |
677 | ||
678 | static void | |
679 | create_opm_scanner(const char *key __unused, int parc __unused, const char **parv) | |
680 | { | |
681 | int iport = atoi(parv[1]); | |
682 | struct opm_proxy *proxy = rb_malloc(sizeof(struct opm_proxy)); | |
683 | ||
684 | if(iport <= 0 || iport > 65535) | |
685 | { | |
686 | warn_opers(L_CRIT, "OPM: got a bad scanner: %s (port %s)", parv[0], parv[1]); | |
687 | exit(EX_PROVIDER_ERROR); | |
688 | } | |
689 | ||
690 | proxy->port = (uint16_t)iport; | |
691 | ||
692 | switch((proxy->proto = get_protocol_from_string(parv[0]))) | |
693 | { | |
694 | case PROTO_SOCKS4: | |
695 | snprintf(proxy->note, sizeof(proxy->note), "socks4:%hu", proxy->port); | |
696 | break; | |
697 | case PROTO_SOCKS5: | |
698 | snprintf(proxy->note, sizeof(proxy->note), "socks5:%hu", proxy->port); | |
699 | break; | |
700 | default: | |
701 | warn_opers(L_CRIT, "OPM: got an unknown proxy type: %s (port %hu)", parv[0], proxy->port); | |
702 | exit(EX_PROVIDER_ERROR); | |
703 | } | |
704 | ||
705 | if(find_proxy_scanner(proxy->proto, proxy->port) != NULL) | |
706 | { | |
707 | warn_opers(L_CRIT, "OPM: got a duplicate scanner: %s (port %hu)", parv[0], proxy->port); | |
708 | exit(EX_PROVIDER_ERROR); | |
709 | } | |
710 | ||
711 | rb_dlinkAdd(proxy, &proxy->node, &proxy_scanners); | |
712 | } | |
713 | ||
714 | static void | |
715 | delete_opm_scanner(const char *key __unused, int parc __unused, const char **parv) | |
716 | { | |
717 | struct auth_client *auth; | |
718 | struct opm_proxy *proxy; | |
719 | protocol_t proto = get_protocol_from_string(parv[0]); | |
720 | int iport = atoi(parv[1]); | |
721 | rb_dictionary_iter iter; | |
722 | ||
723 | if(iport <= 0 || iport > 65535) | |
724 | { | |
725 | warn_opers(L_CRIT, "OPM: got a bad scanner to delete: %s (port %s)", parv[0], parv[1]); | |
726 | exit(EX_PROVIDER_ERROR); | |
727 | } | |
728 | ||
729 | if(proto == PROTO_NONE) | |
730 | { | |
731 | warn_opers(L_CRIT, "OPM: got an unknown proxy type to delete: %s (port %d)", parv[0], iport); | |
732 | exit(EX_PROVIDER_ERROR); | |
733 | } | |
734 | ||
735 | if((proxy = find_proxy_scanner(proto, (uint16_t)iport)) == NULL) | |
736 | { | |
737 | warn_opers(L_CRIT, "OPM: cannot find proxy to delete: %s (port %d)", parv[0], iport); | |
738 | exit(EX_PROVIDER_ERROR); | |
739 | } | |
740 | ||
741 | /* Abort remaining clients on this scanner */ | |
742 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
743 | { | |
744 | rb_dlink_node *ptr; | |
745 | struct opm_lookup *lookup = auth->data[PROVIDER_OPM]; | |
746 | ||
747 | if(lookup == NULL) | |
748 | continue; | |
749 | ||
750 | RB_DLINK_FOREACH(ptr, lookup->scans.head) | |
751 | { | |
752 | struct opm_scan *scan = ptr->data; | |
753 | ||
754 | if(scan->proxy->port == proxy->port && scan->proxy->proto == proxy->proto) | |
755 | { | |
756 | /* Match */ | |
757 | rb_dlinkDelete(&scan->node, &lookup->scans); | |
758 | rb_free(scan); | |
759 | ||
760 | if(!rb_dlink_list_length(&lookup->scans)) | |
761 | opm_cancel(auth); | |
762 | ||
763 | break; | |
764 | } | |
765 | } | |
766 | } | |
767 | ||
768 | rb_dlinkDelete(&proxy->node, &proxy_scanners); | |
769 | rb_free(proxy); | |
770 | } | |
771 | ||
772 | static void | |
773 | delete_opm_scanner_all(const char *key __unused, int parc __unused, const char **parv __unused) | |
774 | { | |
775 | struct auth_client *auth; | |
776 | rb_dlink_node *ptr, *nptr; | |
777 | rb_dictionary_iter iter; | |
778 | ||
779 | RB_DLINK_FOREACH_SAFE(ptr, nptr, proxy_scanners.head) | |
780 | { | |
781 | rb_free(ptr->data); | |
782 | rb_dlinkDelete(ptr, &proxy_scanners); | |
783 | } | |
784 | ||
785 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
786 | { | |
787 | opm_cancel(auth); | |
788 | } | |
789 | } | |
790 | ||
791 | ||
792 | struct auth_opts_handler opm_options[] = | |
793 | { | |
794 | { "opm_timeout", 1, add_conf_opm_timeout }, | |
795 | { "opm_enabled", 1, set_opm_enabled }, | |
796 | { "opm_listener", 2, set_opm_listener }, | |
797 | { "opm_scanner", 2, create_opm_scanner }, | |
798 | { "opm_scanner_del", 2, delete_opm_scanner }, | |
799 | { "opm_scanner_del_all", 0, delete_opm_scanner_all }, | |
800 | { NULL, 0, NULL }, | |
801 | }; | |
802 | ||
803 | struct auth_provider opm_provider = | |
804 | { | |
805 | .id = PROVIDER_OPM, | |
806 | .destroy = opm_destroy, | |
807 | .start = opm_start, | |
808 | .cancel = opm_cancel, | |
809 | .timeout = opm_cancel, | |
810 | .opt_handlers = opm_options, | |
811 | }; |