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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 auth_client *auth = NULL; | |
200 | struct opm_listener *listener = data; | |
201 | struct rb_sockaddr_storage localaddr; | |
202 | unsigned int llen = sizeof(struct rb_sockaddr_storage); | |
203 | rb_dictionary_iter iter; | |
204 | ||
205 | if(status != 0 || listener == NULL) | |
206 | { | |
207 | rb_close(F); | |
208 | return; | |
209 | } | |
210 | ||
211 | if(getsockname(rb_get_fd(F), (struct sockaddr *)&localaddr, &llen)) | |
212 | { | |
213 | /* This can happen if the client goes away after accept */ | |
214 | rb_close(F); | |
215 | return; | |
216 | } | |
217 | ||
218 | /* Correlate connection with client(s) */ | |
219 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
220 | { | |
221 | if(GET_SS_FAMILY(&auth->c_addr) != GET_SS_FAMILY(&localaddr)) | |
222 | continue; | |
223 | ||
224 | /* Compare the addresses */ | |
225 | switch(GET_SS_FAMILY(&localaddr)) | |
226 | { | |
227 | case AF_INET: | |
228 | { | |
229 | struct sockaddr_in *s = (struct sockaddr_in *)&localaddr, *c = (struct sockaddr_in *)&auth->c_addr; | |
230 | ||
231 | if(s->sin_addr.s_addr == c->sin_addr.s_addr) | |
232 | { | |
233 | /* Match... check if it's real */ | |
234 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
235 | return; | |
236 | } | |
237 | break; | |
238 | } | |
239 | #ifdef RB_IPV6 | |
240 | case AF_INET6: | |
241 | { | |
242 | struct sockaddr_in6 *s = (struct sockaddr_in6 *)&localaddr, *c = (struct sockaddr_in6 *)&auth->c_addr; | |
243 | ||
244 | if(IN6_ARE_ADDR_EQUAL(&s->sin6_addr, &c->sin6_addr)) | |
245 | { | |
246 | rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth); | |
247 | return; | |
248 | } | |
249 | break; | |
250 | } | |
251 | #endif | |
252 | default: | |
253 | warn_opers(L_CRIT, "OPM: unknown address type in listen function"); | |
254 | exit(EX_PROVIDER_ERROR); | |
255 | } | |
256 | } | |
257 | ||
258 | /* We don't care about the socket if we get here */ | |
259 | rb_close(F); | |
260 | } | |
261 | ||
262 | /* Scanners */ | |
263 | ||
264 | static void | |
265 | opm_connected(rb_fde_t *F, int error, void *data) | |
266 | { | |
267 | struct opm_scan *scan = data; | |
268 | struct opm_proxy *proxy = scan->proxy; | |
269 | struct auth_client *auth = scan->auth; | |
270 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
271 | ||
272 | if(error || !opm_enable) | |
273 | { | |
274 | //notice_client(scan->auth->cid, "*** Scan not connected: %s", proxy->note); | |
275 | goto end; | |
276 | } | |
277 | ||
278 | switch(GET_SS_FAMILY(&auth->c_addr)) | |
279 | { | |
280 | case AF_INET: | |
281 | if(listeners[LISTEN_IPV4].F == NULL) | |
282 | /* They cannot respond to us */ | |
283 | goto end; | |
284 | ||
285 | break; | |
286 | #ifdef RB_IPV6 | |
287 | case AF_INET6: | |
288 | if(!proxy->ipv6) | |
289 | /* Welp, too bad */ | |
290 | goto end; | |
291 | ||
292 | if(listeners[LISTEN_IPV6].F == NULL) | |
293 | /* They cannot respond to us */ | |
294 | goto end; | |
295 | ||
296 | break; | |
297 | #endif | |
298 | default: | |
299 | goto end; | |
300 | } | |
301 | ||
302 | proxy->callback(scan); | |
303 | ||
304 | end: | |
305 | rb_close(scan->F); | |
306 | rb_dlinkDelete(&scan->node, &lookup->scans); | |
307 | rb_free(scan); | |
308 | } | |
309 | ||
310 | static void | |
311 | socks4_connected(struct opm_scan *scan) | |
312 | { | |
313 | struct auth_client *auth = scan->auth; | |
314 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
315 | uint8_t sendbuf[9]; /* Size we're building */ | |
316 | uint8_t *c = sendbuf; | |
317 | ||
318 | memcpy(c, "\x04\x01", 2); c += 2; /* Socks version 4, connect command */ | |
319 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_port), 2); c += 2; /* Port */ | |
320 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_addr.s_addr), 4); c += 4; /* Address */ | |
321 | *c = '\x00'; /* No userid */ | |
322 | ||
323 | /* Send header */ | |
324 | if(rb_write(scan->F, sendbuf, sizeof(sendbuf)) < 0) | |
325 | return; | |
326 | ||
327 | /* Send note */ | |
328 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) < 0) | |
329 | return; | |
330 | } | |
331 | ||
332 | static void | |
333 | socks5_connected(struct opm_scan *scan) | |
334 | { | |
335 | struct auth_client *auth = scan->auth; | |
336 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
337 | uint8_t sendbuf[25]; /* Size we're building */ | |
338 | uint8_t *c = sendbuf; | |
339 | ||
340 | auth = scan->auth; | |
341 | lookup = get_provider_data(auth, SELF_PID); | |
342 | ||
343 | /* Build the version header and socks request | |
344 | * version header (3 bytes): version, number of auth methods, auth type (0 for none) | |
345 | * connect req (3 bytes): version, command (1 = connect), reserved (0) | |
346 | */ | |
347 | memcpy(c, "\x05\x01\x00\x05\x01\x00", 6); c += 6; | |
348 | ||
349 | switch(GET_SS_FAMILY(&auth->c_addr)) | |
350 | { | |
351 | case AF_INET: | |
352 | *(c++) = '\x01'; /* Address type (1 = IPv4) */ | |
353 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_addr.s_addr), 4); c += 4; /* Address */ | |
354 | memcpy(c, &(((struct sockaddr_in *)&scan->listener->addr)->sin_port), 2); c += 2; /* Port */ | |
355 | break; | |
356 | #ifdef RB_IPV6 | |
357 | case AF_INET6: | |
358 | *(c++) = '\x04'; /* Address type (4 = IPv6) */ | |
359 | memcpy(c, ((struct sockaddr_in6 *)&scan->listener->addr)->sin6_addr.s6_addr, 16); c += 16; /* Address */ | |
360 | memcpy(c, &(((struct sockaddr_in6 *)&scan->listener->addr)->sin6_port), 2); c += 2; /* Port */ | |
361 | break; | |
362 | #endif | |
363 | default: | |
364 | return; | |
365 | } | |
366 | ||
367 | /* Send header */ | |
368 | if(rb_write(scan->F, sendbuf, (size_t)(sendbuf - c)) <= 0) | |
369 | return; | |
370 | ||
371 | /* Now the note in a separate write */ | |
372 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) <= 0) | |
373 | return; | |
374 | } | |
375 | ||
376 | static void | |
377 | http_connect_connected(struct opm_scan *scan) | |
378 | { | |
379 | struct auth_client *auth = scan->auth; | |
380 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
381 | char sendbuf[128]; /* A bit bigger than we need but better safe than sorry */ | |
382 | char *c = sendbuf; | |
383 | ||
384 | /* Simple enough to build */ | |
385 | snprintf(sendbuf, sizeof(sendbuf), "CONNECT %s:%hu HTTP/1.0\r\n\r\n", scan->listener->ip, scan->listener->port); | |
386 | ||
387 | /* Send request */ | |
388 | if(rb_write(scan->F, sendbuf, strlen(sendbuf)) <= 0) | |
389 | return; | |
390 | ||
391 | /* Now the note in a separate write */ | |
392 | if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) <= 0) | |
393 | return; | |
394 | ||
395 | /* MiroTik needs this, and as a separate write */ | |
396 | if(rb_write(scan->F, "\r\n", 2) <= 0) | |
397 | return; | |
398 | } | |
399 | ||
400 | /* Establish connections */ | |
401 | static inline void | |
402 | establish_connection(struct auth_client *auth, struct opm_proxy *proxy) | |
403 | { | |
404 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
405 | struct opm_scan *scan = rb_malloc(sizeof(struct opm_scan)); | |
406 | struct opm_listener *listener; | |
407 | struct rb_sockaddr_storage c_a, l_a; | |
408 | int opt = 1; | |
409 | ||
410 | lrb_assert(lookup != NULL); | |
411 | ||
412 | #ifdef RB_IPV6 | |
413 | if(GET_SS_FAMILY(&auth->c_addr) == AF_INET6) | |
414 | { | |
415 | if(proxy->proto == PROTO_SOCKS4) | |
416 | { | |
417 | /* SOCKS4 doesn't support IPv6 */ | |
418 | rb_free(scan); | |
419 | return; | |
420 | } | |
421 | listener = &listeners[LISTEN_IPV6]; | |
422 | } | |
423 | else | |
424 | #endif | |
425 | listener = &listeners[LISTEN_IPV4]; | |
426 | ||
427 | if(listener->F == NULL) | |
428 | { | |
429 | /* We can't respond */ | |
430 | rb_free(scan); | |
431 | return; | |
432 | } | |
433 | ||
434 | c_a = auth->c_addr; /* Client */ | |
435 | l_a = listener->addr; /* Listener (connect using its IP) */ | |
436 | ||
437 | scan->auth = auth; | |
438 | scan->proxy = proxy; | |
439 | scan->listener = listener; | |
440 | if((scan->F = rb_socket(GET_SS_FAMILY(&auth->c_addr), SOCK_STREAM, 0, proxy->note)) == NULL) | |
441 | { | |
442 | warn_opers(L_WARN, "OPM: could not create OPM socket (proto %s): %s", proxy->note, strerror(errno)); | |
443 | rb_free(scan); | |
444 | return; | |
445 | } | |
446 | ||
447 | /* Disable Nagle's algorithim - buffering could affect scans */ | |
448 | (void)setsockopt(rb_get_fd(scan->F), IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt)); | |
449 | ||
450 | SET_SS_PORT(&l_a, 0); | |
451 | SET_SS_PORT(&c_a, htons(proxy->port)); | |
452 | ||
453 | rb_dlinkAdd(scan, &scan->node, &lookup->scans); | |
454 | ||
455 | if(!proxy->ssl) | |
456 | rb_connect_tcp(scan->F, | |
457 | (struct sockaddr *)&c_a, | |
458 | (struct sockaddr *)&l_a, | |
459 | opm_connected, scan, opm_timeout); | |
460 | else | |
461 | rb_connect_tcp_ssl(scan->F, | |
462 | (struct sockaddr *)&c_a, | |
463 | (struct sockaddr *)&l_a, | |
464 | opm_connected, scan, opm_timeout); | |
465 | } | |
466 | ||
467 | static bool | |
468 | create_listener(const char *ip, uint16_t port) | |
469 | { | |
470 | struct auth_client *auth; | |
471 | struct opm_listener *listener; | |
472 | struct rb_sockaddr_storage addr; | |
473 | rb_dictionary_iter iter; | |
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_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
564 | { | |
565 | opm_cancel(auth); | |
566 | /* auth is now invalid as we have no reference */ | |
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 | auth_client_ref(auth); | |
636 | ||
637 | set_provider_data(auth, SELF_PID, rb_malloc(sizeof(struct opm_lookup))); | |
638 | ||
639 | if((!get_provider_id("rdns", &rdns_pid) || is_provider_done(auth, rdns_pid)) && | |
640 | (!get_provider_id("ident", &ident_pid) || is_provider_done(auth, ident_pid))) | |
641 | { | |
642 | /* Don't start until ident and rdns are finished (or not loaded) */ | |
643 | opm_scan(auth); | |
644 | } | |
645 | ||
646 | set_provider_running(auth, SELF_PID); | |
647 | return true; | |
648 | } | |
649 | ||
650 | static void | |
651 | opm_cancel(struct auth_client *auth) | |
652 | { | |
653 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
654 | ||
655 | if(lookup != NULL) | |
656 | { | |
657 | rb_dlink_node *ptr, *nptr; | |
658 | ||
659 | notice_client(auth->cid, "*** Did not detect open proxies"); | |
660 | ||
661 | RB_DLINK_FOREACH_SAFE(ptr, nptr, lookup->scans.head) | |
662 | { | |
663 | struct opm_scan *scan = ptr->data; | |
664 | ||
665 | rb_close(scan->F); | |
666 | rb_free(scan); | |
667 | } | |
668 | ||
669 | rb_free(lookup); | |
670 | ||
671 | set_provider_data(auth, SELF_PID, NULL); | |
672 | set_provider_timeout_absolute(auth, SELF_PID, 0); | |
673 | provider_done(auth, SELF_PID); | |
674 | ||
675 | auth_client_unref(auth); | |
676 | } | |
677 | } | |
678 | ||
679 | static void | |
680 | opm_destroy(void) | |
681 | { | |
682 | struct auth_client *auth; | |
683 | rb_dictionary_iter iter; | |
684 | ||
685 | /* Nuke all opm lookups */ | |
686 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
687 | { | |
688 | opm_cancel(auth); | |
689 | /* auth is now invalid as we have no reference */ | |
690 | } | |
691 | } | |
692 | ||
693 | ||
694 | static void | |
695 | add_conf_opm_timeout(const char *key __unused, int parc __unused, const char **parv) | |
696 | { | |
697 | int timeout = atoi(parv[0]); | |
698 | ||
699 | if(timeout < 0) | |
700 | { | |
701 | warn_opers(L_CRIT, "opm: opm timeout < 0 (value: %d)", timeout); | |
702 | return; | |
703 | } | |
704 | ||
705 | opm_timeout = timeout; | |
706 | } | |
707 | ||
708 | static void | |
709 | set_opm_enabled(const char *key __unused, int parc __unused, const char **parv) | |
710 | { | |
711 | bool enable = (*parv[0] == '1'); | |
712 | ||
713 | if(!enable) | |
714 | { | |
715 | if(listeners[LISTEN_IPV4].F != NULL || listeners[LISTEN_IPV6].F != NULL) | |
716 | { | |
717 | struct auth_client *auth; | |
718 | rb_dictionary_iter iter; | |
719 | ||
720 | /* Close the listening socket */ | |
721 | if(listeners[LISTEN_IPV4].F != NULL) | |
722 | rb_close(listeners[LISTEN_IPV4].F); | |
723 | ||
724 | if(listeners[LISTEN_IPV6].F != NULL) | |
725 | rb_close(listeners[LISTEN_IPV6].F); | |
726 | ||
727 | listeners[LISTEN_IPV4].F = listeners[LISTEN_IPV6].F = NULL; | |
728 | ||
729 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
730 | { | |
731 | opm_cancel(auth); | |
732 | /* auth is now invalid as we have no reference */ | |
733 | } | |
734 | } | |
735 | } | |
736 | else | |
737 | { | |
738 | if(listeners[LISTEN_IPV4].ip[0] != '\0' && listeners[LISTEN_IPV4].port != 0) | |
739 | { | |
740 | if(listeners[LISTEN_IPV4].F == NULL) | |
741 | /* Pre-configured IP/port, just re-establish */ | |
742 | create_listener(listeners[LISTEN_IPV4].ip, listeners[LISTEN_IPV4].port); | |
743 | } | |
744 | ||
745 | if(listeners[LISTEN_IPV6].ip[0] != '\0' && listeners[LISTEN_IPV6].port != 0) | |
746 | { | |
747 | if(listeners[LISTEN_IPV6].F == NULL) | |
748 | /* Pre-configured IP/port, just re-establish */ | |
749 | create_listener(listeners[LISTEN_IPV6].ip, listeners[LISTEN_IPV6].port); | |
750 | } | |
751 | } | |
752 | ||
753 | opm_enable = enable; | |
754 | } | |
755 | ||
756 | static void | |
757 | set_opm_listener(const char *key __unused, int parc __unused, const char **parv) | |
758 | { | |
759 | const char *ip = parv[0]; | |
760 | int iport = atoi(parv[1]); | |
761 | ||
762 | if(iport > 65535 || iport <= 0) | |
763 | { | |
764 | warn_opers(L_CRIT, "OPM: got a bad listener: %s:%s", parv[0], parv[1]); | |
765 | exit(EX_PROVIDER_ERROR); | |
766 | } | |
767 | ||
768 | create_listener(ip, (uint16_t)iport); | |
769 | } | |
770 | ||
771 | static void | |
772 | create_opm_scanner(const char *key __unused, int parc __unused, const char **parv) | |
773 | { | |
774 | int iport = atoi(parv[1]); | |
775 | struct opm_proxy *proxy = rb_malloc(sizeof(struct opm_proxy)); | |
776 | ||
777 | if(iport <= 0 || iport > 65535) | |
778 | { | |
779 | warn_opers(L_CRIT, "OPM: got a bad scanner: %s (port %s)", parv[0], parv[1]); | |
780 | exit(EX_PROVIDER_ERROR); | |
781 | } | |
782 | ||
783 | proxy->port = (uint16_t)iport; | |
784 | ||
785 | switch((proxy->proto = get_protocol_from_string(parv[0]))) | |
786 | { | |
787 | case PROTO_SOCKS4: | |
788 | snprintf(proxy->note, sizeof(proxy->note), "socks4:%hu", proxy->port); | |
789 | proxy->ssl = false; | |
790 | proxy->callback = socks4_connected; | |
791 | break; | |
792 | case PROTO_SOCKS5: | |
793 | snprintf(proxy->note, sizeof(proxy->note), "socks5:%hu", proxy->port); | |
794 | proxy->ssl = false; | |
795 | proxy->callback = socks5_connected; | |
796 | break; | |
797 | case PROTO_HTTP_CONNECT: | |
798 | snprintf(proxy->note, sizeof(proxy->note), "httpconnect:%hu", proxy->port); | |
799 | proxy->ssl = false; | |
800 | proxy->callback = http_connect_connected; | |
801 | break; | |
802 | case PROTO_HTTPS_CONNECT: | |
803 | snprintf(proxy->note, sizeof(proxy->note), "httpsconnect:%hu", proxy->port); | |
804 | proxy->callback = http_connect_connected; | |
805 | proxy->ssl = true; | |
806 | break; | |
807 | default: | |
808 | warn_opers(L_CRIT, "OPM: got an unknown proxy type: %s (port %hu)", parv[0], proxy->port); | |
809 | exit(EX_PROVIDER_ERROR); | |
810 | } | |
811 | ||
812 | if(find_proxy_scanner(proxy->proto, proxy->port) != NULL) | |
813 | { | |
814 | warn_opers(L_CRIT, "OPM: got a duplicate scanner: %s (port %hu)", parv[0], proxy->port); | |
815 | exit(EX_PROVIDER_ERROR); | |
816 | } | |
817 | ||
818 | rb_dlinkAdd(proxy, &proxy->node, &proxy_scanners); | |
819 | } | |
820 | ||
821 | static void | |
822 | delete_opm_scanner(const char *key __unused, int parc __unused, const char **parv) | |
823 | { | |
824 | struct auth_client *auth; | |
825 | struct opm_proxy *proxy; | |
826 | protocol_t proto = get_protocol_from_string(parv[0]); | |
827 | int iport = atoi(parv[1]); | |
828 | rb_dictionary_iter iter; | |
829 | ||
830 | if(iport <= 0 || iport > 65535) | |
831 | { | |
832 | warn_opers(L_CRIT, "OPM: got a bad scanner to delete: %s (port %s)", parv[0], parv[1]); | |
833 | exit(EX_PROVIDER_ERROR); | |
834 | } | |
835 | ||
836 | if(proto == PROTO_NONE) | |
837 | { | |
838 | warn_opers(L_CRIT, "OPM: got an unknown proxy type to delete: %s (port %d)", parv[0], iport); | |
839 | exit(EX_PROVIDER_ERROR); | |
840 | } | |
841 | ||
842 | if((proxy = find_proxy_scanner(proto, (uint16_t)iport)) == NULL) | |
843 | { | |
844 | warn_opers(L_CRIT, "OPM: cannot find proxy to delete: %s (port %d)", parv[0], iport); | |
845 | exit(EX_PROVIDER_ERROR); | |
846 | } | |
847 | ||
848 | /* Abort remaining clients on this scanner */ | |
849 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
850 | { | |
851 | rb_dlink_node *ptr; | |
852 | struct opm_lookup *lookup = get_provider_data(auth, SELF_PID); | |
853 | ||
854 | if(lookup == NULL) | |
855 | continue; | |
856 | ||
857 | auth_client_ref(auth); | |
858 | ||
859 | RB_DLINK_FOREACH(ptr, lookup->scans.head) | |
860 | { | |
861 | struct opm_scan *scan = ptr->data; | |
862 | ||
863 | if(scan->proxy->port == proxy->port && scan->proxy->proto == proxy->proto) | |
864 | { | |
865 | /* Match */ | |
866 | rb_dlinkDelete(&scan->node, &lookup->scans); | |
867 | rb_free(scan); | |
868 | ||
869 | if(rb_dlink_list_length(&lookup->scans) == 0) | |
870 | opm_cancel(auth); | |
871 | ||
872 | break; | |
873 | } | |
874 | } | |
875 | ||
876 | auth_client_unref(auth); | |
877 | } | |
878 | ||
879 | rb_dlinkDelete(&proxy->node, &proxy_scanners); | |
880 | rb_free(proxy); | |
881 | ||
882 | if(rb_dlink_list_length(&proxy_scanners) == 0) | |
883 | opm_enable = false; | |
884 | } | |
885 | ||
886 | static void | |
887 | delete_opm_scanner_all(const char *key __unused, int parc __unused, const char **parv __unused) | |
888 | { | |
889 | struct auth_client *auth; | |
890 | rb_dlink_node *ptr, *nptr; | |
891 | rb_dictionary_iter iter; | |
892 | ||
893 | RB_DLINK_FOREACH_SAFE(ptr, nptr, proxy_scanners.head) | |
894 | { | |
895 | rb_free(ptr->data); | |
896 | rb_dlinkDelete(ptr, &proxy_scanners); | |
897 | } | |
898 | ||
899 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) | |
900 | { | |
901 | opm_cancel(auth); | |
902 | /* auth is now invalid as we have no reference */ | |
903 | } | |
904 | ||
905 | opm_enable = false; | |
906 | } | |
907 | ||
908 | static void | |
909 | delete_opm_listener_all(const char *key __unused, int parc __unused, const char **parv __unused) | |
910 | { | |
911 | if(listeners[LISTEN_IPV4].F != NULL) | |
912 | rb_close(listeners[LISTEN_IPV4].F); | |
913 | ||
914 | #ifdef RB_IPV6 | |
915 | if(listeners[LISTEN_IPV6].F != NULL) | |
916 | rb_close(listeners[LISTEN_IPV6].F); | |
917 | #endif | |
918 | ||
919 | memset(&listeners, 0, sizeof(listeners)); | |
920 | } | |
921 | ||
922 | ||
923 | struct auth_opts_handler opm_options[] = | |
924 | { | |
925 | { "opm_timeout", 1, add_conf_opm_timeout }, | |
926 | { "opm_enabled", 1, set_opm_enabled }, | |
927 | { "opm_listener", 2, set_opm_listener }, | |
928 | { "opm_listener_del_all", 0, delete_opm_listener_all }, | |
929 | { "opm_scanner", 2, create_opm_scanner }, | |
930 | { "opm_scanner_del", 2, delete_opm_scanner }, | |
931 | { "opm_scanner_del_all", 0, delete_opm_scanner_all }, | |
932 | { NULL, 0, NULL }, | |
933 | }; | |
934 | ||
935 | struct auth_provider opm_provider = | |
936 | { | |
937 | .name = "opm", | |
938 | .letter = 'O', | |
939 | .destroy = opm_destroy, | |
940 | .start = opm_start, | |
941 | .cancel = opm_cancel, | |
942 | .timeout = opm_cancel, | |
943 | .completed = opm_initiate, | |
944 | .opt_handlers = opm_options, | |
945 | }; |