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[l2tpns.git] / radius.c
1 // L2TPNS Radius Stuff
2
3 #include <time.h>
4 #include <stdio.h>
5 #include <sys/types.h>
6 #include <sys/socket.h>
7 #include <malloc.h>
8 #include <string.h>
9 #include <fcntl.h>
10 #include <arpa/inet.h>
11 #include <ctype.h>
12 #include <netinet/in.h>
13 #include <errno.h>
14 #include <linux/rtnetlink.h>
15
16 #include "md5.h"
17 #include "constants.h"
18 #include "dhcp6.h"
19 #include "l2tpns.h"
20 #include "plugin.h"
21 #include "util.h"
22 #include "cluster.h"
23
24 #include "l2tplac.h"
25 #include "pppoe.h"
26
27 extern radiust *radius;
28 extern sessiont *session;
29 extern tunnelt *tunnel;
30 extern configt *config;
31 extern int *radfds;
32 extern ip_filtert *ip_filters;
33
34 static const hasht zero;
35
36 static void calc_auth(const void *buf, size_t len, const uint8_t *in, uint8_t *out)
37 {
38 MD5_CTX ctx;
39
40 MD5_Init(&ctx);
41 MD5_Update(&ctx, (void *)buf, 4); // code, id, length
42 MD5_Update(&ctx, (void *)in, 16); // auth
43 MD5_Update(&ctx, (void *)(buf + 20), len - 20);
44 MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
45 MD5_Final(out, &ctx);
46 }
47
48 // Set up socket for radius requests
49 void initrad(void)
50 {
51 int i;
52 uint16_t port = 0;
53 uint16_t min = config->radius_bind_min;
54 uint16_t max = config->radius_bind_max;
55 int inc = 1;
56 struct sockaddr_in addr;
57
58 if (min)
59 {
60 port = min;
61 if (!max)
62 max = ~0 - 1;
63 }
64 else if (max) /* no minimum specified, bind from max down */
65 {
66 port = max;
67 min = 1;
68 inc = -1;
69 }
70
71 LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", RADIUS_FDS);
72 radfds = calloc(sizeof(int), RADIUS_FDS);
73 for (i = 0; i < RADIUS_FDS; i++)
74 {
75 int flags;
76 radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
77 flags = fcntl(radfds[i], F_GETFL, 0);
78 fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
79
80 if (port)
81 {
82 int b;
83
84 memset(&addr, 0, sizeof(addr));
85 addr.sin_family = AF_INET;
86 addr.sin_addr.s_addr = INADDR_ANY;
87
88 do {
89 addr.sin_port = htons(port);
90 if ((b = bind(radfds[i], (struct sockaddr *) &addr, sizeof(addr))) < 0)
91 {
92 if ((port += inc) < min || port > max)
93 {
94 LOG(0, 0, 0, "Can't bind RADIUS socket in range %u-%u\n", min, max);
95 exit(1);
96 }
97 }
98 } while (b < 0);
99 }
100 }
101 }
102
103 void radiusclear(uint16_t r, sessionidt s)
104 {
105 if (s) sess_local[s].radius = 0;
106 memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
107 }
108
109 static uint16_t get_free_radius()
110 {
111 int count;
112 static uint32_t next_radius_id = 0;
113
114 for (count = MAXRADIUS; count > 0; --count)
115 {
116 ++next_radius_id; // Find the next ID to check.
117 if (next_radius_id >= MAXRADIUS)
118 next_radius_id = 1;
119
120 if (radius[next_radius_id].state == RADIUSNULL)
121 {
122 return next_radius_id;
123 }
124 }
125
126 LOG(0, 0, 0, "Can't find a free radius session! This is very bad!\n");
127 return 0;
128 }
129
130 uint16_t radiusnew(sessionidt s)
131 {
132 uint16_t r = sess_local[s].radius;
133
134 /* re-use */
135 if (r)
136 {
137 LOG(3, s, session[s].tunnel, "Re-used radius %d\n", r);
138 return r;
139 }
140
141 if (!(r = get_free_radius()))
142 {
143 LOG(1, s, session[s].tunnel, "No free RADIUS sessions\n");
144 STAT(radius_overflow);
145 return 0;
146 };
147
148 memset(&radius[r], 0, sizeof(radius[r]));
149 sess_local[s].radius = r;
150 radius[r].session = s;
151 radius[r].state = RADIUSWAIT;
152 radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
153
154 random_data(radius[r].auth, sizeof(radius[r].auth));
155
156 LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r);
157 return r;
158 }
159
160 // Send a RADIUS request
161 void radiussend(uint16_t r, uint8_t state)
162 {
163 struct sockaddr_in addr;
164 uint8_t b[4096]; // RADIUS packet
165 char pass[129];
166 int pl;
167 uint8_t *p;
168 sessionidt s;
169
170 CSTAT(radiussend);
171
172 s = radius[r].session;
173 if (!config->numradiusservers)
174 {
175 LOG(0, s, session[s].tunnel, "No RADIUS servers\n");
176 return;
177 }
178 if (!*config->radiussecret)
179 {
180 LOG(0, s, session[s].tunnel, "No RADIUS secret\n");
181 return;
182 }
183
184 if (state != RADIUSAUTH && state != RADIUSJUSTAUTH && !config->radius_accounting)
185 {
186 // Radius accounting is turned off
187 radiusclear(r, s);
188 return;
189 }
190
191 if (radius[r].state != state)
192 radius[r].try = 0;
193
194 radius[r].state = state;
195 radius[r].retry = backoff(radius[r].try++) + 20; // 3s, 4s, 6s, 10s...
196 LOG(4, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
197 r >> RADIUS_SHIFT, r & RADIUS_MASK,
198 radius_state(radius[r].state), radius[r].try);
199
200 if (radius[r].try > config->numradiusservers * 2)
201 {
202 if (s)
203 {
204 if (state == RADIUSAUTH || state == RADIUSJUSTAUTH)
205 sessionshutdown(s, "RADIUS timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE);
206 else
207 {
208 LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
209 radius_state(state));
210 radiusclear(r, s);
211 }
212 STAT(radius_timeout);
213 }
214 else
215 {
216 STAT(radius_retries);
217 radius[r].state = RADIUSWAIT;
218 radius[r].retry = 100;
219 }
220 return;
221 }
222 // contruct RADIUS access request
223 switch (state)
224 {
225 case RADIUSAUTH:
226 case RADIUSJUSTAUTH:
227 b[0] = AccessRequest; // access request
228 break;
229 case RADIUSSTART:
230 case RADIUSSTOP:
231 case RADIUSINTERIM:
232 b[0] = AccountingRequest; // accounting request
233 break;
234 default:
235 LOG(0, 0, 0, "Unknown radius state %d\n", state);
236 }
237 b[1] = r >> RADIUS_SHIFT; // identifier
238 memcpy(b + 4, radius[r].auth, 16);
239
240 p = b + 20;
241 if (s)
242 {
243 *p = 1; // user name
244 p[1] = strlen(session[s].user) + 2;
245 strcpy((char *) p + 2, session[s].user);
246 p += p[1];
247 }
248 if (state == RADIUSAUTH || state == RADIUSJUSTAUTH)
249 {
250 if (radius[r].chap)
251 {
252 *p = 3; // CHAP password
253 p[1] = 19; // length
254 p[2] = radius[r].id; // ID
255 memcpy(p + 3, radius[r].pass, 16); // response from CHAP request
256 p += p[1];
257 *p = 60; // CHAP Challenge
258 p[1] = 18; // length
259 memcpy(p + 2, radius[r].auth, 16);
260 p += p[1];
261 }
262 else
263 {
264 strcpy(pass, radius[r].pass);
265 pl = strlen(pass);
266 while (pl & 15)
267 pass[pl++] = 0; // pad
268 if (pl)
269 { // encrypt
270 hasht hash;
271 int p = 0;
272 while (p < pl)
273 {
274 MD5_CTX ctx;
275 MD5_Init(&ctx);
276 MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
277 if (p)
278 MD5_Update(&ctx, pass + p - 16, 16);
279 else
280 MD5_Update(&ctx, radius[r].auth, 16);
281 MD5_Final(hash, &ctx);
282 do
283 {
284 pass[p] ^= hash[p & 15];
285 p++;
286 }
287 while (p & 15);
288 }
289 }
290 *p = 2; // password
291 p[1] = pl + 2;
292 if (pl)
293 memcpy(p + 2, pass, pl);
294 p += p[1];
295 }
296 }
297 else // accounting
298 {
299 *p = 40; // accounting type
300 p[1] = 6;
301 *(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3
302 p += p[1];
303 if (s)
304 {
305 *p = 44; // session ID
306 p[1] = 18;
307 sprintf((char *) p + 2, "%08X%08X", session[s].unique_id, session[s].opened);
308 p += p[1];
309 if (state == RADIUSSTART)
310 { // start
311 *p = 41; // delay
312 p[1] = 6;
313 *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
314 p += p[1];
315 sess_local[s].last_interim = time_now; // Setup "first" Interim
316 }
317 else
318 { // stop, interim
319 *p = 42; // input octets
320 p[1] = 6;
321 *(uint32_t *) (p + 2) = htonl(session[s].cin);
322 p += p[1];
323
324 *p = 43; // output octets
325 p[1] = 6;
326 *(uint32_t *) (p + 2) = htonl(session[s].cout);
327 p += p[1];
328
329 *p = 46; // session time
330 p[1] = 6;
331 *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
332 p += p[1];
333
334 *p = 47; // input packets
335 p[1] = 6;
336 *(uint32_t *) (p + 2) = htonl(session[s].pin);
337 p += p[1];
338
339 *p = 48; // output packets
340 p[1] = 6;
341 *(uint32_t *) (p + 2) = htonl(session[s].pout);
342 p += p[1];
343
344 *p = 52; // input gigawords
345 p[1] = 6;
346 *(uint32_t *) (p + 2) = htonl(session[s].cin_wrap);
347 p += p[1];
348
349 *p = 53; // output gigawords
350 p[1] = 6;
351 *(uint32_t *) (p + 2) = htonl(session[s].cout_wrap);
352 p += p[1];
353
354 if (state == RADIUSSTOP && radius[r].term_cause)
355 {
356 *p = 49; // acct-terminate-cause
357 p[1] = 6;
358 *(uint32_t *) (p + 2) = htonl(radius[r].term_cause);
359 p += p[1];
360
361 if (radius[r].term_msg)
362 {
363 *p = 26; // vendor-specific
364 *(uint32_t *) (p + 2) = htonl(9); // Cisco
365 p[6] = 1; // Cisco-AVPair
366 p[7] = 2 + sprintf((char *) p + 8, "disc-cause-ext=%s", radius[r].term_msg);
367 p[1] = p[7] + 6;
368 p += p[1];
369 }
370 }
371 }
372
373 if (session[s].classlen) {
374 *p = 25; // class
375 p[1] = session[s].classlen + 2;
376 memcpy(p + 2, session[s].class, session[s].classlen);
377 p += p[1];
378 }
379
380 {
381 struct param_radius_account acct = { &tunnel[session[s].tunnel], &session[s], &p };
382 run_plugins(PLUGIN_RADIUS_ACCOUNT, &acct);
383 }
384 }
385 }
386
387 if (s)
388 {
389 *p = 5; // NAS-Port
390 p[1] = 6;
391 *(uint32_t *) (p + 2) = htonl(s);
392 p += p[1];
393
394 *p = 6; // Service-Type
395 p[1] = 6;
396 *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 8 : 2)); // Authenticate only or Framed-User respectevily
397 p += p[1];
398
399 *p = 7; // Framed-Protocol
400 p[1] = htonl((state == RADIUSJUSTAUTH ? 0 : 6));
401 *(uint32_t *) (p + 2) = htonl((state == RADIUSJUSTAUTH ? 0 : 1)); // PPP
402 p += p[1];
403
404 if (session[s].ip)
405 {
406 *p = 8; // Framed-IP-Address
407 p[1] = 6;
408 *(uint32_t *) (p + 2) = htonl(session[s].ip);
409 p += p[1];
410 }
411
412 if (session[s].route[0].ip)
413 {
414 int r;
415 for (r = 0; s && r < MAXROUTE && session[s].route[r].ip; r++)
416 {
417 *p = 22; // Framed-Route
418 p[1] = sprintf((char *) p + 2, "%s/%d %s 1",
419 fmtaddr(htonl(session[s].route[r].ip), 0),
420 session[s].route[r].prefixlen,
421 fmtaddr(htonl(session[s].ip), 1)) + 2;
422
423 p += p[1];
424 }
425 }
426
427 if (session[s].session_timeout)
428 {
429 *p = 27; // Session-Timeout
430 p[1] = 6;
431 *(uint32_t *) (p + 2) = htonl(session[s].session_timeout);
432 p += p[1];
433 }
434
435 if (session[s].idle_timeout)
436 {
437 *p = 28; // Idle-Timeout
438 p[1] = 6;
439 *(uint32_t *) (p + 2) = htonl(session[s].idle_timeout);
440 p += p[1];
441 }
442
443 if (*session[s].called)
444 {
445 *p = 30; // called
446 p[1] = strlen(session[s].called) + 2;
447 strcpy((char *) p + 2, session[s].called);
448 p += p[1];
449 }
450
451 if (*session[s].calling)
452 {
453 *p = 31; // calling
454 p[1] = strlen(session[s].calling) + 2;
455 strcpy((char *) p + 2, session[s].calling);
456 p += p[1];
457 }
458 }
459
460 // NAS-IP-Address
461 *p = 4;
462 p[1] = 6;
463 *(uint32_t *)(p + 2) = config->bind_address;
464 p += p[1];
465
466 // All AVpairs added
467 *(uint16_t *) (b + 2) = htons(p - b);
468 if (state != RADIUSAUTH && state != RADIUSJUSTAUTH)
469 {
470 // Build auth for accounting packet
471 calc_auth(b, p - b, zero, b + 4);
472 memcpy(radius[r].auth, b + 4, 16);
473 }
474 memset(&addr, 0, sizeof(addr));
475 addr.sin_family = AF_INET;
476 *(uint32_t *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
477 {
478 // get radius port
479 uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers];
480 // assume RADIUS accounting port is the authentication port +1
481 addr.sin_port = htons((state == RADIUSAUTH || state == RADIUSJUSTAUTH) ? port : port+1);
482 }
483
484 LOG_HEX(5, "RADIUS Send", b, (p - b));
485 sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
486 }
487
488 static void handle_avpair(sessionidt s, uint8_t *avp, int len)
489 {
490 uint8_t *key = avp;
491 uint8_t *value = memchr(avp, '=', len);
492 uint8_t tmp[2048] = "";
493
494 if (value)
495 {
496 *value++ = 0;
497 len -= value - key;
498 }
499 else
500 {
501 value = tmp;
502 len = 0;
503 }
504
505 // strip quotes
506 if (len > 2 && (*value == '"' || *value == '\'') && value[len - 1] == *value)
507 {
508 value++;
509 len--;
510 value[len - 1] = 0;
511 }
512 // copy and null terminate
513 else if (len < sizeof(tmp) - 1)
514 {
515 memcpy(tmp, value, len);
516 tmp[len] = 0;
517 value = tmp;
518 }
519 else
520 return;
521
522 // Run hooks
523 {
524 struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], (char *) key, (char *) value };
525 run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
526 }
527 }
528
529 // process RADIUS response
530 void processrad(uint8_t *buf, int len, char socket_index)
531 {
532 uint8_t b[MAXETHER];
533 uint16_t r;
534 sessionidt s;
535 tunnelidt t = 0;
536 hasht hash;
537 uint8_t routes = 0;
538 int r_code;
539 int r_id;
540 int OpentunnelReq = 0;
541
542 CSTAT(processrad);
543
544 LOG_HEX(5, "RADIUS Response", buf, len);
545 if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
546 {
547 LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
548 return ;
549 }
550
551 r_code = buf[0]; // response type
552 r_id = buf[1]; // radius reply indentifier.
553
554 len = ntohs(*(uint16_t *) (buf + 2));
555 r = socket_index | (r_id << RADIUS_SHIFT);
556 s = radius[r].session;
557 LOG(3, s, session[s].tunnel, "Received %s, radius %d response for session %u (%s, id %d)\n",
558 radius_state(radius[r].state), r, s, radius_code(r_code), r_id);
559
560 if (!s && radius[r].state != RADIUSSTOP)
561 {
562 LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
563 return;
564 }
565 if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSJUSTAUTH && radius[r].state != RADIUSSTART
566 && radius[r].state != RADIUSSTOP && radius[r].state != RADIUSINTERIM)
567 {
568 LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
569 return;
570 }
571 t = session[s].tunnel;
572 calc_auth(buf, len, radius[r].auth, hash);
573 do {
574 if (memcmp(hash, buf + 4, 16))
575 {
576 LOG(0, s, session[s].tunnel, " Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
577 return; // Do nothing. On timeout, it will try the next radius server.
578 }
579
580 if (((radius[r].state == RADIUSAUTH ||radius[r].state == RADIUSJUSTAUTH) && r_code != AccessAccept && r_code != AccessReject) ||
581 ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP || radius[r].state == RADIUSINTERIM) && r_code != AccountingResponse))
582 {
583 LOG(1, s, session[s].tunnel, " Unexpected RADIUS response %s\n", radius_code(r_code));
584 return; // We got something we didn't expect. Let the timeouts take
585 // care off finishing the radius session if that's really correct.
586 }
587
588 if (radius[r].state == RADIUSAUTH || radius[r].state == RADIUSJUSTAUTH)
589 {
590 // run post-auth plugin
591 struct param_post_auth packet = {
592 &tunnel[t],
593 &session[s],
594 session[s].user,
595 (r_code == AccessAccept),
596 radius[r].chap ? PPPCHAP : PPPPAP
597 };
598
599 run_plugins(PLUGIN_POST_AUTH, &packet);
600 r_code = packet.auth_allowed ? AccessAccept : AccessReject;
601
602 if (r_code == AccessAccept)
603 {
604 // Login successful
605 // Extract IP, routes, etc
606 uint8_t *p = buf + 20;
607 uint8_t *e = buf + len;
608 uint8_t tag;
609 uint8_t strtemp[256];
610 lac_reset_rad_tag_tunnel_ctxt();
611
612 for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
613 {
614 if (*p == 26 && p[1] >= 7)
615 {
616 // Vendor-Specific Attribute
617 uint32_t vendor = ntohl(*(int *)(p + 2));
618 uint8_t attrib = *(p + 6);
619 int attrib_length = *(p + 7) - 2;
620
621 LOG(4, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%u Attrib=%u Length=%d\n", vendor, attrib, attrib_length);
622 if (vendor == 9 && attrib == 1) // Cisco-AVPair
623 {
624 if (attrib_length < 0) continue;
625 LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n",
626 attrib_length, p + 8);
627
628 handle_avpair(s, p + 8, attrib_length);
629 continue;
630 }
631 else if (vendor == 529 && attrib >= 135 && attrib <= 136) // Ascend
632 {
633 // handle old-format ascend DNS attributes below
634 p += 6;
635 }
636 else if (vendor == 64520) // Sames
637 {
638 //Sames vendor-specific 64520
639 uint8_t *pvs = p + 6; // pvs set to begin to attribute
640 LOG(3, s, session[s].tunnel, " Sames vendor-specific: %d, Attrib: %d, lenght: %d\n", vendor, attrib, attrib_length);
641 grp_processvendorspecific(s, pvs);
642 continue;
643 }
644 else
645 {
646 LOG(3, s, session[s].tunnel, " Unknown vendor-specific: %d, Attrib: %d\n", vendor, attrib);
647 continue;
648 }
649 }
650
651 if (*p == 8)
652 {
653 // Framed-IP-Address
654 if (p[1] < 6) continue;
655 session[s].ip = ntohl(*(uint32_t *) (p + 2));
656 session[s].ip_pool_index = -1;
657 LOG(3, s, session[s].tunnel, " Radius reply contains IP address %s\n",
658 fmtaddr(htonl(session[s].ip), 0));
659
660 if (session[s].ip == 0xFFFFFFFE)
661 session[s].ip = 0; // assign from pool
662 }
663 else if (*p == 135)
664 {
665 // DNS address
666 if (p[1] < 6) continue;
667 session[s].dns1 = ntohl(*(uint32_t *) (p + 2));
668 LOG(3, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n",
669 fmtaddr(htonl(session[s].dns1), 0));
670 }
671 else if (*p == 136)
672 {
673 // DNS address
674 if (p[1] < 6) continue;
675 session[s].dns2 = ntohl(*(uint32_t *) (p + 2));
676 LOG(3, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n",
677 fmtaddr(htonl(session[s].dns2), 0));
678 }
679 else if (*p == 22)
680 {
681 // Framed-Route
682 in_addr_t ip = 0;
683 uint8_t u = 0;
684 uint8_t bits = 0;
685 uint8_t *n = p + 2;
686 uint8_t *e = p + p[1];
687 while (n < e && (isdigit(*n) || *n == '.'))
688 {
689 if (*n == '.')
690 {
691 ip = (ip << 8) + u;
692 u = 0;
693 }
694 else
695 u = u * 10 + *n - '0';
696 n++;
697 }
698 ip = (ip << 8) + u;
699 if (*n == '/')
700 {
701 n++;
702 while (n < e && isdigit(*n))
703 bits = bits * 10 + *n++ - '0';
704 }
705 else if ((ip >> 24) < 128)
706 bits = 8;
707 else if ((ip >> 24) < 192)
708 bits = 16;
709 else
710 bits = 24;
711
712 if (routes == MAXROUTE)
713 {
714 LOG(1, s, session[s].tunnel, " Too many routes\n");
715 }
716 else if (ip)
717 {
718 LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%d\n",
719 fmtaddr(htonl(ip), 0), bits);
720
721 session[s].route[routes].ip = ip;
722 session[s].route[routes].prefixlen = bits;
723 routes++;
724 }
725 }
726 else if (*p == 11)
727 {
728 // Filter-Id
729 char *filter = (char *) p + 2;
730 int l = p[1] - 2;
731 char *suffix;
732 int f;
733 uint8_t *fp = 0;
734
735 LOG(3, s, session[s].tunnel, " Radius reply contains Filter-Id \"%.*s\"\n", l, filter);
736 if ((suffix = memchr(filter, '.', l)))
737 {
738 int b = suffix - filter;
739 if (l - b == 3 && !memcmp("in", suffix+1, 2))
740 fp = &session[s].filter_in;
741 else if (l - b == 4 && !memcmp("out", suffix+1, 3))
742 fp = &session[s].filter_out;
743
744 l = b;
745 }
746
747 if (!fp)
748 {
749 LOG(3, s, session[s].tunnel, " Invalid filter\n");
750 continue;
751 }
752
753 if ((f = find_filter(filter, l)) < 0 || !*ip_filters[f].name)
754 {
755 LOG(3, s, session[s].tunnel, " Unknown filter\n");
756 }
757 else
758 {
759 *fp = f + 1;
760 ip_filters[f].used++;
761 }
762 }
763 else if (*p == 27)
764 {
765 // Session-Timeout
766 if (p[1] < 6) continue;
767 session[s].session_timeout = ntohl(*(uint32_t *)(p + 2));
768 LOG(3, s, session[s].tunnel, " Radius reply contains Session-Timeout = %u\n", session[s].session_timeout);
769 if(!session[s].session_timeout && config->kill_timedout_sessions)
770 sessionshutdown(s, "Session timeout is zero", CDN_ADMIN_DISC, 0);
771 }
772 else if (*p == 28)
773 {
774 // Idle-Timeout
775 if (p[1] < 6) continue;
776 session[s].idle_timeout = ntohl(*(uint32_t *)(p + 2));
777 LOG(3, s, session[s].tunnel, " Radius reply contains Idle-Timeout = %u\n", session[s].idle_timeout);
778 }
779 else if (*p == 99)
780 {
781 // Framed-IPv6-Route
782 struct in6_addr r6;
783 int prefixlen;
784 uint8_t *n = p + 2;
785 uint8_t *e = p + p[1];
786 uint8_t *m = memchr(n, '/', e - n);
787
788 *m++ = 0;
789 inet_pton(AF_INET6, (char *) n, &r6);
790
791 prefixlen = 0;
792 while (m < e && isdigit(*m)) {
793 prefixlen = prefixlen * 10 + *m++ - '0';
794 }
795
796 if (prefixlen)
797 {
798 LOG(3, s, session[s].tunnel,
799 " Radius reply contains route for %s/%d\n",
800 n, prefixlen);
801 session[s].ipv6route = r6;
802 session[s].ipv6prefixlen = prefixlen;
803 }
804 }
805 else if (*p == 123)
806 {
807 // Delegated-IPv6-Prefix
808 if ((p[1] > 4) && (p[3] > 0) && (p[3] <= 128))
809 {
810 char ipv6addr[INET6_ADDRSTRLEN];
811 memcpy(&session[s].ipv6route, &p[4], p[1] - 4);
812 session[s].ipv6prefixlen = p[3];
813 LOG(3, s, session[s].tunnel, " Radius reply contains Delegated IPv6 Prefix %s/%d\n",
814 inet_ntop(AF_INET6, &session[s].ipv6route, ipv6addr, INET6_ADDRSTRLEN), session[s].ipv6prefixlen);
815 }
816 }
817 else if (*p == 168)
818 {
819 // Framed-IPv6-Address
820 if (p[1] == 18)
821 {
822 char ipv6addr[INET6_ADDRSTRLEN];
823 memcpy(&session[s].ipv6address, &p[2], 16);
824 LOG(3, s, session[s].tunnel, " Radius reply contains Framed-IPv6-Address %s\n", inet_ntop(AF_INET6, &session[s].ipv6address, ipv6addr, INET6_ADDRSTRLEN));
825 }
826 }
827 else if (*p == 25)
828 {
829 // Class
830 if (p[1] < 3) continue;
831 session[s].classlen = p[1] - 2;
832 if (session[s].classlen > MAXCLASS)
833 session[s].classlen = MAXCLASS;
834 memcpy(session[s].class, p + 2, session[s].classlen);
835 }
836 else if (*p == 64)
837 {
838 // Tunnel-Type
839 if (p[1] != 6) continue;
840 tag = p[2];
841 LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Type:%d %d\n",
842 tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
843 // Fill context
844 lac_set_rad_tag_tunnel_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
845 /* Request open tunnel to remote LNS*/
846 OpentunnelReq = 1;
847 }
848 else if (*p == 65)
849 {
850 // Tunnel-Medium-Type
851 if (p[1] < 6) continue;
852 tag = p[2];
853 LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Medium-Type:%d %d\n",
854 tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
855 // Fill context
856 lac_set_rad_tag_tunnel_medium_type(tag, ntohl(*(uint32_t *)(p + 2)) & 0xFFFFFF);
857 }
858 else if (*p == 67)
859 {
860 // Tunnel-Server-Endpoint
861 if (p[1] < 3) continue;
862 tag = p[2];
863 //If the Tag field is greater than 0x1F,
864 // it SHOULD be interpreted as the first byte of the following String field.
865 memset(strtemp, 0, 256);
866 if (tag > 0x1F)
867 {
868 tag = 0;
869 memcpy(strtemp, (p + 2), p[1]-2);
870 }
871 else
872 memcpy(strtemp, (p + 3), p[1]-3);
873
874 LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Server-Endpoint:%d %s\n", tag, strtemp);
875 // Fill context
876 lac_set_rad_tag_tunnel_serv_endpt(tag, (char *) strtemp);
877 }
878 else if (*p == 69)
879 {
880 // Tunnel-Password
881 size_t lentemp;
882
883 if (p[1] < 5) continue;
884 tag = p[2];
885
886 memset(strtemp, 0, 256);
887 lentemp = p[1]-3;
888 memcpy(strtemp, (p + 3), lentemp);
889 if (!rad_tunnel_pwdecode(strtemp, &lentemp, config->radiussecret, radius[r].auth))
890 {
891 LOG_HEX(3, "Error Decode Tunnel-Password, Dump Radius reponse:", p, p[1]);
892 continue;
893 }
894
895 LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Password:%d %s\n", tag, strtemp);
896 if (strlen((char *) strtemp) > 63)
897 {
898 LOG(1, s, session[s].tunnel, "tunnel password is too long (>63)\n");
899 continue;
900 }
901 // Fill context
902 lac_set_rad_tag_tunnel_password(tag, (char *) strtemp);
903 }
904 else if (*p == 82)
905 {
906 // Tunnel-Assignment-Id
907 if (p[1] < 3) continue;
908 tag = p[2];
909 //If the Tag field is greater than 0x1F,
910 // it SHOULD be interpreted as the first byte of the following String field.
911 memset(strtemp, 0, 256);
912 if (tag > 0x1F)
913 {
914 tag = 0;
915 memcpy(strtemp, (p + 2), p[1]-2);
916 }
917 else
918 memcpy(strtemp, (p + 3), p[1]-3);
919
920 LOG(3, s, session[s].tunnel, " Radius reply Tunnel-Assignment-Id:%d %s\n", tag, strtemp);
921 // Fill context
922 lac_set_rad_tag_tunnel_assignment_id(tag, (char *) strtemp);
923 }
924 }
925 }
926 else if (r_code == AccessReject)
927 {
928 LOG(2, s, session[s].tunnel, " Authentication rejected for %s\n", session[s].user);
929 sessionkill(s, "Authentication rejected");
930 break;
931 }
932
933 if ((!config->disable_lac_func) && OpentunnelReq)
934 {
935 char assignment_id[256];
936 // Save radius tag context to conf
937 lac_save_rad_tag_tunnels(s);
938
939 memset(assignment_id, 0, 256);
940 if (!lac_rad_select_assignment_id(s, assignment_id))
941 break; // Error no assignment_id
942
943 LOG(3, s, session[s].tunnel, "Select Tunnel Remote LNS for assignment_id == %s\n", assignment_id);
944
945 if (lac_rad_forwardtoremotelns(s, assignment_id, session[s].user))
946 {
947 int ro;
948 // Sanity check, no local IP to session forwarded
949 session[s].ip = 0;
950 for (ro = 0; r < MAXROUTE && session[s].route[ro].ip; r++)
951 {
952 session[s].route[ro].ip = 0;
953 }
954 break;
955 }
956 }
957
958 // process auth response
959 if (radius[r].chap)
960 {
961 // CHAP
962 uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0);
963 if (!p) return; // Abort!
964
965 *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak
966 p[1] = radius[r].id;
967 *(uint16_t *) (p + 2) = ntohs(4); // no message
968 tunnelsend(b, (p - b) + 4, t); // send it
969
970 LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user,
971 (r_code == AccessAccept) ? "allowed" : "denied");
972 }
973 else
974 {
975 // PAP
976 uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0);
977 if (!p) return; // Abort!
978
979 // ack/nak
980 *p = r_code;
981 p[1] = radius[r].id;
982 *(uint16_t *) (p + 2) = ntohs(5);
983 p[4] = 0; // no message
984 tunnelsend(b, (p - b) + 5, t); // send it
985
986 LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user,
987 (r_code == AccessAccept) ? "allowed" : "denied");
988 }
989
990 if (!session[s].dns1 && config->default_dns1)
991 {
992 session[s].dns1 = ntohl(config->default_dns1);
993 LOG(3, s, t, " Sending dns1 = %s\n", fmtaddr(config->default_dns1, 0));
994 }
995 if (!session[s].dns2 && config->default_dns2)
996 {
997 session[s].dns2 = ntohl(config->default_dns2);
998 LOG(3, s, t, " Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));
999 }
1000
1001 // Valid Session, set it up
1002 session[s].unique_id = 0;
1003 sessionsetup(s, t);
1004 }
1005 else
1006 {
1007 // An ack for a stop or start record.
1008 LOG(3, s, t, " RADIUS accounting ack recv in state %s\n", radius_state(radius[r].state));
1009 break;
1010 }
1011 } while (0);
1012
1013 // finished with RADIUS
1014 radiusclear(r, s);
1015 }
1016
1017 // Send a retry for RADIUS/CHAP message
1018 void radiusretry(uint16_t r)
1019 {
1020 sessionidt s = radius[r].session;
1021 tunnelidt t = 0;
1022
1023 CSTAT(radiusretry);
1024
1025 if (s) t = session[s].tunnel;
1026
1027 switch (radius[r].state)
1028 {
1029 case RADIUSCHAP: // sending CHAP down PPP
1030 sendchap(s, t);
1031 break;
1032 case RADIUSAUTH: // sending auth to RADIUS server
1033 case RADIUSJUSTAUTH: // sending auth to RADIUS server
1034 case RADIUSSTART: // sending start accounting to RADIUS server
1035 case RADIUSSTOP: // sending stop accounting to RADIUS server
1036 case RADIUSINTERIM: // sending interim accounting to RADIUS server
1037 radiussend(r, radius[r].state);
1038 break;
1039 default:
1040 case RADIUSNULL: // Not in use
1041 case RADIUSWAIT: // waiting timeout before available, in case delayed reply from RADIUS server
1042 // free up RADIUS task
1043 radiusclear(r, s);
1044 LOG(3, s, session[s].tunnel, "Freeing up radius session %d\n", r);
1045 break;
1046 }
1047 }
1048
1049 extern int daefd;
1050
1051 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
1052 {
1053 int i, r_code, r_id, length, attribute_length;
1054 uint8_t *packet, attribute;
1055 hasht hash;
1056 char username[MAXUSER] = "";
1057 in_addr_t nas = 0;
1058 in_addr_t ip = 0;
1059 uint32_t port = 0;
1060 uint32_t error = 0;
1061 sessionidt s = 0;
1062 tunnelidt t;
1063 int fin = -1;
1064 int fout = -1;
1065 uint8_t *avpair[64];
1066 int avpair_len[sizeof(avpair)/sizeof(*avpair)];
1067 int avp = 0;
1068 int auth_only = 0;
1069 uint8_t *p;
1070
1071 LOG(3, 0, 0, "DAE request from %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
1072 LOG_HEX(5, "DAE Request", buf, len);
1073
1074 if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
1075 {
1076 LOG(1, 0, 0, "Duff DAE request length %d\n", len);
1077 return;
1078 }
1079
1080 r_code = buf[0]; // request type
1081 r_id = buf[1]; // radius indentifier.
1082
1083 if (r_code != DisconnectRequest && r_code != CoARequest)
1084 {
1085 LOG(1, 0, 0, "Unrecognised DAE request %s\n", radius_code(r_code));
1086 return;
1087 }
1088
1089 if (!config->cluster_iam_master)
1090 {
1091 master_forward_dae_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
1092 return;
1093 }
1094
1095 len = ntohs(*(uint16_t *) (buf + 2));
1096
1097 LOG(3, 0, 0, "Received DAE %s, id %d\n", radius_code(r_code), r_id);
1098
1099 // check authenticator
1100 calc_auth(buf, len, zero, hash);
1101 if (memcmp(hash, buf + 4, 16) != 0)
1102 {
1103 LOG(1, 0, 0, "Incorrect vector in DAE request (wrong secret in radius config?)\n");
1104 return;
1105 }
1106
1107 // unpack attributes
1108 packet = buf + 20;
1109 length = len - 20;
1110
1111 while (length > 0)
1112 {
1113 attribute = *packet++;
1114 attribute_length = *packet++;
1115 if (attribute_length < 2)
1116 break;
1117
1118 length -= attribute_length;
1119 attribute_length -= 2;
1120 switch (attribute)
1121 {
1122 case 1: /* username */
1123 len = attribute_length < MAXUSER ? attribute_length : MAXUSER - 1;
1124 memcpy(username, packet, len);
1125 username[len] = 0;
1126 LOG(4, 0, 0, " Received DAE User-Name: %s\n", username);
1127 break;
1128
1129 case 4: /* nas ip address */
1130 nas = *(uint32_t *) packet; // net order
1131 if (nas != config->bind_address)
1132 error = 403; // NAS identification mismatch
1133
1134 LOG(4, 0, 0, " Received DAE NAS-IP-Address: %s\n", fmtaddr(nas, 0));
1135 break;
1136
1137 case 5: /* nas port */
1138 port = ntohl(*(uint32_t *) packet);
1139 if (port < 1 || port > MAXSESSION)
1140 error = 404;
1141
1142 LOG(4, 0, 0, " Received DAE NAS-Port: %u\n", port);
1143 break;
1144
1145 case 6: /* service type */
1146 {
1147 uint32_t service_type = ntohl(*(uint32_t *) packet);
1148 auth_only = service_type == 8; // Authenticate only
1149
1150 LOG(4, 0, 0, " Received DAE Service-Type: %u\n", service_type);
1151 }
1152 break;
1153
1154 case 8: /* ip address */
1155 ip = *(uint32_t *) packet; // net order
1156 LOG(4, 0, 0, " Received DAE Framed-IP-Address: %s\n", fmtaddr(ip, 0));
1157 break;
1158
1159 case 11: /* filter id */
1160 LOG(4, 0, 0, " Received DAE Filter-Id: %.*s\n", attribute_length, packet);
1161 if (!(p = memchr(packet, '.', attribute_length)))
1162 {
1163 error = 404; // invalid request
1164 break;
1165 }
1166
1167 len = p - packet;
1168 i = find_filter((char *) packet, len);
1169 if (i < 0 || !*ip_filters[i].name)
1170 {
1171 error = 404;
1172 break;
1173 }
1174
1175 if (!memcmp(p, ".in", attribute_length - len))
1176 fin = i + 1;
1177 else if (!memcmp(p, ".out", attribute_length - len))
1178 fout = i + 1;
1179 else
1180 error = 404;
1181
1182 break;
1183
1184 case 26: /* vendor specific */
1185 if (attribute_length >= 6
1186 && ntohl(*(uint32_t *) packet) == 9 // Cisco
1187 && *(packet + 4) == 1 // Cisco-AVPair
1188 && *(packet + 5) >= 2) // length
1189 {
1190 int len = *(packet + 5) - 2;
1191 uint8_t *a = packet + 6;
1192
1193 LOG(4, 0, 0, " Received DAE Cisco-AVPair: %.*s\n", len, a);
1194 if (avp < sizeof(avpair)/sizeof(*avpair) - 1)
1195 {
1196 avpair[avp] = a;
1197 avpair_len[avp++] = len;
1198 }
1199 }
1200 break;
1201 }
1202
1203 packet += attribute_length;
1204 }
1205
1206 if (!error && auth_only)
1207 {
1208 if (fin != -1 || fout != -1 || avp)
1209 error = 401; // unsupported attribute
1210 else
1211 error = 405; // unsupported service
1212 }
1213
1214 if (!error && !(port || ip || *username))
1215 error = 402; // missing attribute
1216
1217 // exact match for SID if given
1218 if (!error && port)
1219 {
1220 s = port;
1221 if (!session[s].opened)
1222 error = 503; // not found
1223 }
1224
1225 if (!error && ip)
1226 {
1227 // find/check session by IP
1228 i = sessionbyip(ip);
1229 if (!i || (s && s != i)) // not found or mismatching port
1230 error = 503;
1231 else
1232 s = i;
1233 }
1234
1235 if (!error && *username)
1236 {
1237 if (s)
1238 {
1239 if (strcmp(session[s].user, username))
1240 error = 503;
1241 }
1242 else if (!(s = sessionbyuser(username)))
1243 error = 503;
1244 }
1245
1246 t = session[s].tunnel;
1247
1248 switch (r_code)
1249 {
1250 case DisconnectRequest: // Packet of Disconnect/Death
1251 if (error)
1252 {
1253 r_code = DisconnectNAK;
1254 break;
1255 }
1256
1257 LOG(3, s, t, " DAE Disconnect %d (%s)\n", s, session[s].user);
1258 r_code = DisconnectACK;
1259
1260 sessionshutdown(s, "Requested by PoD", CDN_ADMIN_DISC, TERM_ADMIN_RESET); // disconnect session
1261 break;
1262
1263 case CoARequest: // Change of Authorization
1264 if (error)
1265 {
1266 r_code = CoANAK;
1267 break;
1268 }
1269
1270 LOG(3, s, t, " DAE Change %d (%s)\n", s, session[s].user);
1271 r_code = CoAACK;
1272
1273 // reset
1274 {
1275 struct param_radius_reset p = { &tunnel[session[s].tunnel], &session[s] };
1276 run_plugins(PLUGIN_RADIUS_RESET, &p);
1277 }
1278
1279 // apply filters
1280 if (fin == -1)
1281 fin = 0;
1282 else
1283 LOG(3, s, t, " Filter in %d (%s)\n", fin, ip_filters[fin - 1].name);
1284
1285 if (fout == -1)
1286 fout = 0;
1287 else
1288 LOG(3, s, t, " Filter out %d (%s)\n", fout, ip_filters[fout - 1].name);
1289
1290 filter_session(s, fin, fout);
1291
1292 // process cisco av-pair(s)
1293 for (i = 0; i < avp; i++)
1294 {
1295 LOG(3, s, t, " Cisco-AVPair: %.*s\n", avpair_len[i], avpair[i]);
1296 handle_avpair(s, avpair[i], avpair_len[i]);
1297 }
1298
1299 cluster_send_session(s);
1300 break;
1301 }
1302
1303 // send response
1304 packet = buf;
1305 *packet++ = r_code;
1306 *packet++ = r_id;
1307 // skip len + auth
1308 packet += 2 + 16;
1309 len = packet - buf;
1310
1311 // add attributes
1312 if (error)
1313 {
1314 // add error cause
1315 *packet++ = 101;
1316 *packet++ = 6;
1317 *(uint32_t *) packet = htonl(error);
1318 len += 6;
1319 }
1320
1321 *((uint16_t *)(buf + 2)) = htons(len);
1322
1323 // make vector
1324 calc_auth(buf, len, hash, buf + 4);
1325
1326 LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id);
1327
1328 // send DAE response
1329 if (sendtofrom(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen, local) < 0)
1330 LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
1331 }
1332
1333 // Decrypte the encrypted Tunnel Password.
1334 // Defined in RFC-2868.
1335 // the pl2tpsecret buffer must set to 256 characters.
1336 // return 0 on decoding error else length of decoded l2tpsecret
1337 int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen,
1338 const char *radiussecret, const uint8_t * auth)
1339 {
1340 MD5_CTX ctx, oldctx;
1341 hasht hash;
1342 int secretlen;
1343 unsigned i, n, len, decodedlen;
1344
1345 /* 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 6 7
1346 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1347 | Salt | Salt | String ..........
1348 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*/
1349
1350 len = *pl2tpsecretlen;
1351
1352 if (len < 2)
1353 {
1354 LOG(1, 0, 0, "tunnel password is too short, We need at least a salt\n");
1355 return 0;
1356 }
1357
1358 if (len <= 3)
1359 {
1360 pl2tpsecret[0] = 0;
1361 *pl2tpsecretlen = 0;
1362 LOG(1, 0, 0, "tunnel passwd is empty !!!\n");
1363 return 0;
1364 }
1365
1366 len -= 2; /* discount the salt */
1367
1368 //Use the secret to setup the decryption
1369 secretlen = strlen(radiussecret);
1370
1371 MD5_Init(&ctx);
1372 MD5_Update(&ctx, (void *) radiussecret, secretlen);
1373 oldctx = ctx; /* save intermediate work */
1374
1375 // Set up the initial key:
1376 // b(1) = MD5(radiussecret + auth + salt)
1377 MD5_Update(&ctx, (void *) auth, 16);
1378 MD5_Update(&ctx, pl2tpsecret, 2);
1379
1380 decodedlen = 0;
1381 for (n = 0; n < len; n += 16)
1382 {
1383 int base = 0;
1384
1385 if (n == 0)
1386 {
1387 MD5_Final(hash, &ctx);
1388
1389 ctx = oldctx;
1390
1391 // the first octet, it's the 'data_len'
1392 // Check is correct
1393 decodedlen = pl2tpsecret[2] ^ hash[0];
1394 if (decodedlen >= len)
1395 {
1396 LOG(1, 0, 0, "tunnel password is too long !!!\n");
1397 return 0;
1398 }
1399
1400 MD5_Update(&ctx, pl2tpsecret + 2, 16);
1401 base = 1;
1402 } else
1403 {
1404 MD5_Final(hash, &ctx);
1405
1406 ctx = oldctx;
1407 MD5_Update(&ctx, pl2tpsecret + n + 2, 16);
1408 }
1409
1410 for (i = base; i < 16; i++)
1411 {
1412 pl2tpsecret[n + i - 1] = pl2tpsecret[n + i + 2] ^ hash[i];
1413 }
1414 }
1415
1416 if (decodedlen > 239) decodedlen = 239;
1417
1418 *pl2tpsecretlen = decodedlen;
1419 pl2tpsecret[decodedlen] = 0;
1420
1421 return decodedlen;
1422 };
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"