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*** empty log message ***
[l2tpns.git] / radius.c
1 // L2TPNS Radius Stuff
2
3 char const *cvs_id_radius = "$Id: radius.c,v 1.44 2005/10/11 09:04:53 bodea Exp $";
4
5 #include <time.h>
6 #include <stdio.h>
7 #include <sys/types.h>
8 #include <sys/socket.h>
9 #include <malloc.h>
10 #include <string.h>
11 #include <fcntl.h>
12 #include <arpa/inet.h>
13 #include <ctype.h>
14 #include <netinet/in.h>
15 #include <errno.h>
16 #include "md5.h"
17 #include "constants.h"
18 #include "l2tpns.h"
19 #include "plugin.h"
20 #include "util.h"
21 #include "cluster.h"
22
23 extern radiust *radius;
24 extern sessiont *session;
25 extern tunnelt *tunnel;
26 extern configt *config;
27 extern int *radfds;
28 extern ip_filtert *ip_filters;
29
30 static const hasht zero;
31
32 static void calc_auth(const void *buf, size_t len, const uint8_t *in, uint8_t *out)
33 {
34 MD5_CTX ctx;
35
36 MD5_Init(&ctx);
37 MD5_Update(&ctx, (void *)buf, 4); // code, id, length
38 MD5_Update(&ctx, (void *)in, 16); // auth
39 MD5_Update(&ctx, (void *)(buf + 20), len - 20);
40 MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
41 MD5_Final(out, &ctx);
42 }
43
44 // Set up socket for radius requests
45 void initrad(void)
46 {
47 int i;
48 LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", RADIUS_FDS);
49 radfds = calloc(sizeof(int), RADIUS_FDS);
50 for (i = 0; i < RADIUS_FDS; i++)
51 {
52 int flags;
53 radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
54 flags = fcntl(radfds[i], F_GETFL, 0);
55 fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
56 }
57 }
58
59 void radiusclear(uint16_t r, sessionidt s)
60 {
61 if (s) sess_local[s].radius = 0;
62 memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
63 }
64
65 static uint16_t get_free_radius()
66 {
67 int count;
68 static uint32_t next_radius_id = 0;
69
70 for (count = MAXRADIUS; count > 0; --count)
71 {
72 ++next_radius_id; // Find the next ID to check.
73 if (next_radius_id >= MAXRADIUS)
74 next_radius_id = 1;
75
76 if (radius[next_radius_id].state == RADIUSNULL)
77 {
78 return next_radius_id;
79 }
80 }
81
82 LOG(0, 0, 0, "Can't find a free radius session! This is very bad!\n");
83 return 0;
84 }
85
86 uint16_t radiusnew(sessionidt s)
87 {
88 uint16_t r = sess_local[s].radius;
89
90 /* re-use */
91 if (r)
92 {
93 LOG(3, s, session[s].tunnel, "Re-used radius %d\n", r);
94 return r;
95 }
96
97 if (!(r = get_free_radius()))
98 {
99 LOG(1, s, session[s].tunnel, "No free RADIUS sessions\n");
100 STAT(radius_overflow);
101 return 0;
102 };
103
104 memset(&radius[r], 0, sizeof(radius[r]));
105 sess_local[s].radius = r;
106 radius[r].session = s;
107 radius[r].state = RADIUSWAIT;
108 radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
109
110 random_data(radius[r].auth, sizeof(radius[r].auth));
111
112 LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r);
113 return r;
114 }
115
116 // Send a RADIUS request
117 void radiussend(uint16_t r, uint8_t state)
118 {
119 struct sockaddr_in addr;
120 uint8_t b[4096]; // RADIUS packet
121 char pass[129];
122 int pl;
123 uint8_t *p;
124 sessionidt s;
125
126 CSTAT(radiussend);
127
128 s = radius[r].session;
129 if (!config->numradiusservers)
130 {
131 LOG(0, s, session[s].tunnel, "No RADIUS servers\n");
132 return;
133 }
134 if (!*config->radiussecret)
135 {
136 LOG(0, s, session[s].tunnel, "No RADIUS secret\n");
137 return;
138 }
139
140 if (state != RADIUSAUTH && !config->radius_accounting)
141 {
142 // Radius accounting is turned off
143 radiusclear(r, s);
144 return;
145 }
146
147 if (radius[r].state != state)
148 radius[r].try = 0;
149
150 radius[r].state = state;
151 radius[r].retry = backoff(radius[r].try++) + 20; // 3s, 4s, 6s, 10s...
152 LOG(4, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
153 r >> RADIUS_SHIFT, r & RADIUS_MASK,
154 radius_state(radius[r].state), radius[r].try);
155
156 if (radius[r].try > config->numradiusservers * 2)
157 {
158 if (s)
159 {
160 if (state == RADIUSAUTH)
161 sessionshutdown(s, "RADIUS timeout.", 3, 0);
162 else
163 {
164 LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
165 radius_state(state));
166 radiusclear(r, s);
167 }
168 STAT(radius_timeout);
169 }
170 else
171 {
172 STAT(radius_retries);
173 radius[r].state = RADIUSWAIT;
174 radius[r].retry = 100;
175 }
176 return;
177 }
178 // contruct RADIUS access request
179 switch (state)
180 {
181 case RADIUSAUTH:
182 b[0] = AccessRequest; // access request
183 break;
184 case RADIUSSTART:
185 case RADIUSSTOP:
186 case RADIUSINTERIM:
187 b[0] = AccountingRequest; // accounting request
188 break;
189 default:
190 LOG(0, 0, 0, "Unknown radius state %d\n", state);
191 }
192 b[1] = r >> RADIUS_SHIFT; // identifier
193 memcpy(b + 4, radius[r].auth, 16);
194 p = b + 20;
195 if (s)
196 {
197 *p = 1; // user name
198 p[1] = strlen(session[s].user) + 2;
199 strcpy((char *) p + 2, session[s].user);
200 p += p[1];
201 }
202 if (state == RADIUSAUTH)
203 {
204 if (radius[r].chap)
205 {
206 *p = 3; // CHAP password
207 p[1] = 19; // length
208 p[2] = radius[r].id; // ID
209 memcpy(p + 3, radius[r].pass, 16); // response from CHAP request
210 p += p[1];
211 *p = 60; // CHAP Challenge
212 p[1] = 18; // length
213 memcpy(p + 2, radius[r].auth, 16);
214 p += p[1];
215 }
216 else
217 {
218 strcpy(pass, radius[r].pass);
219 pl = strlen(pass);
220 while (pl & 15)
221 pass[pl++] = 0; // pad
222 if (pl)
223 { // encrypt
224 hasht hash;
225 int p = 0;
226 while (p < pl)
227 {
228 MD5_CTX ctx;
229 MD5_Init(&ctx);
230 MD5_Update(&ctx, config->radiussecret, strlen(config->radiussecret));
231 if (p)
232 MD5_Update(&ctx, pass + p - 16, 16);
233 else
234 MD5_Update(&ctx, radius[r].auth, 16);
235 MD5_Final(hash, &ctx);
236 do
237 {
238 pass[p] ^= hash[p & 15];
239 p++;
240 }
241 while (p & 15);
242 }
243 }
244 *p = 2; // password
245 p[1] = pl + 2;
246 if (pl)
247 memcpy(p + 2, pass, pl);
248 p += p[1];
249 }
250 }
251 else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM)
252 { // accounting
253 *p = 40; // accounting type
254 p[1] = 6;
255 *(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3
256 p += p[1];
257 if (s)
258 {
259 *p = 44; // session ID
260 p[1] = 18;
261 sprintf((char *) p + 2, "%08X%08X", session[s].unique_id, session[s].opened);
262 p += p[1];
263 if (state == RADIUSSTART)
264 { // start
265 *p = 41; // delay
266 p[1] = 6;
267 *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
268 p += p[1];
269 sess_local[s].last_interim = time_now; // Setup "first" Interim
270 }
271 else
272 { // stop, interim
273 *p = 42; // input octets
274 p[1] = 6;
275 *(uint32_t *) (p + 2) = htonl(session[s].cin);
276 p += p[1];
277
278 *p = 43; // output octets
279 p[1] = 6;
280 *(uint32_t *) (p + 2) = htonl(session[s].cout);
281 p += p[1];
282
283 *p = 46; // session time
284 p[1] = 6;
285 *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
286 p += p[1];
287
288 *p = 47; // input packets
289 p[1] = 6;
290 *(uint32_t *) (p + 2) = htonl(session[s].pin);
291 p += p[1];
292
293 *p = 48; // output packets
294 p[1] = 6;
295 *(uint32_t *) (p + 2) = htonl(session[s].pout);
296 p += p[1];
297
298 *p = 52; // input gigawords
299 p[1] = 6;
300 *(uint32_t *) (p + 2) = htonl(session[s].cin_wrap);
301 p += p[1];
302
303 *p = 53; // output gigawords
304 p[1] = 6;
305 *(uint32_t *) (p + 2) = htonl(session[s].cout_wrap);
306 p += p[1];
307
308 {
309 struct param_radius_account acct = { &tunnel[session[s].tunnel], &session[s], &p };
310 run_plugins(PLUGIN_RADIUS_ACCOUNT, &acct);
311 }
312 }
313 }
314 }
315 if (s)
316 {
317 *p = 5; // NAS-Port
318 p[1] = 6;
319 *(uint32_t *) (p + 2) = htonl(s);
320 p += p[1];
321 }
322 if (s && session[s].ip)
323 {
324 *p = 8; // Framed-IP-Address
325 p[1] = 6;
326 *(uint32_t *) (p + 2) = htonl(session[s].ip);
327 p += p[1];
328 }
329 if (*session[s].called)
330 {
331 *p = 30; // called
332 p[1] = strlen(session[s].called) + 2;
333 strcpy((char *) p + 2, session[s].called);
334 p += p[1];
335 }
336 if (*session[s].calling)
337 {
338 *p = 31; // calling
339 p[1] = strlen(session[s].calling) + 2;
340 strcpy((char *) p + 2, session[s].calling);
341 p += p[1];
342 }
343 // NAS-IP-Address
344 *p = 4;
345 p[1] = 6;
346 *(uint32_t *)(p + 2) = config->bind_address;
347 p += p[1];
348
349 // All AVpairs added
350 *(uint16_t *) (b + 2) = htons(p - b);
351 if (state != RADIUSAUTH)
352 {
353 // Build auth for accounting packet
354 calc_auth(b, p - b, zero, b + 4);
355 memcpy(radius[r].auth, b + 4, 16);
356 }
357 memset(&addr, 0, sizeof(addr));
358 addr.sin_family = AF_INET;
359 *(uint32_t *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
360 {
361 // get radius port
362 uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers];
363 // assume RADIUS accounting port is the authentication port +1
364 addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1);
365 }
366
367 LOG_HEX(5, "RADIUS Send", b, (p - b));
368 sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
369 }
370
371 static void handle_avpair(sessionidt s, uint8_t *avp, int len)
372 {
373 uint8_t *key = avp;
374 uint8_t *value = memchr(avp, '=', len);
375 uint8_t tmp[2048] = "";
376
377 if (value)
378 {
379 *value++ = 0;
380 len -= value - key;
381 }
382 else
383 {
384 value = tmp;
385 len = 0;
386 }
387
388 // strip quotes
389 if (len > 2 && (*value == '"' || *value == '\'') && value[len - 1] == *value)
390 {
391 value++;
392 len--;
393 value[len - 1] = 0;
394 }
395 // copy and null terminate
396 else if (len < sizeof(tmp) - 1)
397 {
398 memcpy(tmp, value, len);
399 tmp[len] = 0;
400 value = tmp;
401 }
402 else
403 return;
404
405 // Run hooks
406 {
407 struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], (char *) key, (char *) value };
408 run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
409 }
410 }
411
412 // process RADIUS response
413 void processrad(uint8_t *buf, int len, char socket_index)
414 {
415 uint8_t b[MAXETHER];
416 uint16_t r;
417 sessionidt s;
418 tunnelidt t = 0;
419 hasht hash;
420 uint8_t routes = 0;
421 int r_code;
422 int r_id;
423
424 CSTAT(processrad);
425
426 LOG_HEX(5, "RADIUS Response", buf, len);
427 if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
428 {
429 LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
430 return ;
431 }
432
433 r_code = buf[0]; // response type
434 r_id = buf[1]; // radius reply indentifier.
435
436 len = ntohs(*(uint16_t *) (buf + 2));
437 r = socket_index | (r_id << RADIUS_SHIFT);
438 s = radius[r].session;
439 LOG(3, s, session[s].tunnel, "Received %s, radius %d response for session %u (%s, id %d)\n",
440 radius_state(radius[r].state), r, s, radius_code(r_code), r_id);
441
442 if (!s && radius[r].state != RADIUSSTOP)
443 {
444 LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
445 return;
446 }
447 if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART
448 && radius[r].state != RADIUSSTOP && radius[r].state != RADIUSINTERIM)
449 {
450 LOG(1, s, session[s].tunnel, " Unexpected RADIUS response\n");
451 return;
452 }
453 t = session[s].tunnel;
454 calc_auth(buf, len, radius[r].auth, hash);
455 do {
456 if (memcmp(hash, buf + 4, 16))
457 {
458 LOG(0, s, session[s].tunnel, " Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
459 return; // Do nothing. On timeout, it will try the next radius server.
460 }
461
462 if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) ||
463 ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP || radius[r].state == RADIUSINTERIM) && r_code != AccountingResponse))
464 {
465 LOG(1, s, session[s].tunnel, " Unexpected RADIUS response %s\n", radius_code(r_code));
466 return; // We got something we didn't expect. Let the timeouts take
467 // care off finishing the radius session if that's really correct.
468 }
469
470 if (radius[r].state == RADIUSAUTH)
471 {
472 // run post-auth plugin
473 struct param_post_auth packet = {
474 &tunnel[t],
475 &session[s],
476 session[s].user,
477 (r_code == AccessAccept),
478 radius[r].chap ? PPPCHAP : PPPPAP
479 };
480
481 run_plugins(PLUGIN_POST_AUTH, &packet);
482 r_code = packet.auth_allowed ? AccessAccept : AccessReject;
483
484 // process auth response
485 if (radius[r].chap)
486 {
487 // CHAP
488 uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
489 if (!p) return; // Abort!
490
491 *p = (r_code == AccessAccept) ? 3 : 4; // ack/nak
492 p[1] = radius[r].id;
493 *(uint16_t *) (p + 2) = ntohs(4); // no message
494 tunnelsend(b, (p - b) + 4, t); // send it
495
496 LOG(3, s, session[s].tunnel, " CHAP User %s authentication %s.\n", session[s].user,
497 (r_code == AccessAccept) ? "allowed" : "denied");
498 }
499 else
500 {
501 // PAP
502 uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
503 if (!p) return; // Abort!
504
505 // ack/nak
506 *p = r_code;
507 p[1] = radius[r].id;
508 *(uint16_t *) (p + 2) = ntohs(5);
509 p[4] = 0; // no message
510 tunnelsend(b, (p - b) + 5, t); // send it
511
512 LOG(3, s, session[s].tunnel, " PAP User %s authentication %s.\n", session[s].user,
513 (r_code == AccessAccept) ? "allowed" : "denied");
514 }
515
516 if (r_code == AccessAccept)
517 {
518 // Login successful
519 // Extract IP, routes, etc
520 uint8_t *p = buf + 20;
521 uint8_t *e = buf + len;
522 for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
523 {
524 if (*p == 8)
525 {
526 // Framed-IP-Address
527 if (p[1] < 6) continue;
528 session[s].ip = ntohl(*(uint32_t *) (p + 2));
529 session[s].ip_pool_index = -1;
530 LOG(3, s, session[s].tunnel, " Radius reply contains IP address %s\n",
531 fmtaddr(htonl(session[s].ip), 0));
532
533 if (session[s].ip == 0xFFFFFFFE)
534 session[s].ip = 0; // assign from pool
535 }
536 else if (*p == 135)
537 {
538 // DNS address
539 if (p[1] < 6) continue;
540 session[s].dns1 = ntohl(*(uint32_t *) (p + 2));
541 LOG(3, s, session[s].tunnel, " Radius reply contains primary DNS address %s\n",
542 fmtaddr(htonl(session[s].dns1), 0));
543 }
544 else if (*p == 136)
545 {
546 // DNS address
547 if (p[1] < 6) continue;
548 session[s].dns2 = ntohl(*(uint32_t *) (p + 2));
549 LOG(3, s, session[s].tunnel, " Radius reply contains secondary DNS address %s\n",
550 fmtaddr(htonl(session[s].dns2), 0));
551 }
552 else if (*p == 22)
553 {
554 // Framed-Route
555 in_addr_t ip = 0, mask = 0;
556 uint8_t u = 0;
557 uint8_t bits = 0;
558 uint8_t *n = p + 2;
559 uint8_t *e = p + p[1];
560 while (n < e && (isdigit(*n) || *n == '.'))
561 {
562 if (*n == '.')
563 {
564 ip = (ip << 8) + u;
565 u = 0;
566 }
567 else
568 u = u * 10 + *n - '0';
569 n++;
570 }
571 ip = (ip << 8) + u;
572 if (*n == '/')
573 {
574 n++;
575 while (n < e && isdigit(*n))
576 bits = bits * 10 + *n++ - '0';
577 mask = (( -1) << (32 - bits));
578 }
579 else if ((ip >> 24) < 128)
580 mask = 0xFF0000;
581 else if ((ip >> 24) < 192)
582 mask = 0xFFFF0000;
583 else
584 mask = 0xFFFFFF00;
585
586 if (routes == MAXROUTE)
587 {
588 LOG(1, s, session[s].tunnel, " Too many routes\n");
589 }
590 else if (ip)
591 {
592 LOG(3, s, session[s].tunnel, " Radius reply contains route for %s/%s\n",
593 fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1));
594
595 session[s].route[routes].ip = ip;
596 session[s].route[routes].mask = mask;
597 routes++;
598 }
599 }
600 else if (*p == 11)
601 {
602 // Filter-Id
603 char *filter = (char *) p + 2;
604 int l = p[1] - 2;
605 char *suffix;
606 int f;
607 uint8_t *fp = 0;
608
609 LOG(3, s, session[s].tunnel, " Radius reply contains Filter-Id \"%.*s\"\n", l, filter);
610 if ((suffix = memchr(filter, '.', l)))
611 {
612 int b = suffix - filter;
613 if (l - b == 3 && !memcmp("in", suffix+1, 2))
614 fp = &session[s].filter_in;
615 else if (l - b == 4 && !memcmp("out", suffix+1, 3))
616 fp = &session[s].filter_out;
617
618 l = b;
619 }
620
621 if (!fp)
622 {
623 LOG(3, s, session[s].tunnel, " Invalid filter\n");
624 continue;
625 }
626
627 if ((f = find_filter(filter, l)) < 0 || !*ip_filters[f].name)
628 {
629 LOG(3, s, session[s].tunnel, " Unknown filter\n");
630 }
631 else
632 {
633 *fp = f + 1;
634 ip_filters[f].used++;
635 }
636 }
637 else if (*p == 26 && p[1] >= 7)
638 {
639 // Vendor-Specific Attribute
640 int vendor = ntohl(*(int *)(p + 2));
641 char attrib = *(p + 6);
642 int attrib_length = *(p + 7) - 2;
643
644 LOG(3, s, session[s].tunnel, " Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
645 if (vendor != 9 || attrib != 1)
646 {
647 LOG(3, s, session[s].tunnel, " Unknown vendor-specific\n");
648 continue;
649 }
650
651 if (attrib_length > 0)
652 {
653 LOG(3, s, session[s].tunnel, " Cisco-AVPair value: %.*s\n",
654 attrib_length, p + 8);
655
656 handle_avpair(s, p + 8, attrib_length);
657 }
658 }
659 else if (*p == 99)
660 {
661 // Framed-IPv6-Route
662 struct in6_addr r6;
663 int prefixlen;
664 uint8_t *n = p + 2;
665 uint8_t *e = p + p[1];
666 uint8_t *m = memchr(n, '/', e - p);
667
668 *m++ = 0;
669 inet_pton(AF_INET6, (char *) n, &r6);
670
671 prefixlen = 0;
672 while (m < e && isdigit(*m)) {
673 prefixlen = prefixlen * 10 + *m++ - '0';
674 }
675
676 if (prefixlen)
677 {
678 LOG(3, s, session[s].tunnel,
679 " Radius reply contains route for %s/%d\n",
680 n, prefixlen);
681 session[s].ipv6route = r6;
682 session[s].ipv6prefixlen = prefixlen;
683 }
684 }
685 }
686 }
687 else if (r_code == AccessReject)
688 {
689 LOG(2, s, session[s].tunnel, " Authentication rejected for %s\n", session[s].user);
690 sessionkill(s, "Authentication rejected");
691 break;
692 }
693
694 if (!session[s].dns1 && config->default_dns1)
695 {
696 session[s].dns1 = ntohl(config->default_dns1);
697 LOG(3, s, t, " Sending dns1 = %s\n", fmtaddr(config->default_dns1, 0));
698 }
699 if (!session[s].dns2 && config->default_dns2)
700 {
701 session[s].dns2 = ntohl(config->default_dns2);
702 LOG(3, s, t, " Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));
703 }
704
705 // Valid Session, set it up
706 session[s].unique_id = 0;
707 sessionsetup(s, t);
708 }
709 else
710 {
711 // An ack for a stop or start record.
712 LOG(3, s, t, " RADIUS accounting ack recv in state %s\n", radius_state(radius[r].state));
713 break;
714 }
715 } while (0);
716
717 // finished with RADIUS
718 radiusclear(r, s);
719 }
720
721 // Send a retry for RADIUS/CHAP message
722 void radiusretry(uint16_t r)
723 {
724 sessionidt s = radius[r].session;
725 tunnelidt t = 0;
726
727 CSTAT(radiusretry);
728
729 if (s) t = session[s].tunnel;
730
731 switch (radius[r].state)
732 {
733 case RADIUSCHAP: // sending CHAP down PPP
734 sendchap(s, t);
735 break;
736 case RADIUSAUTH: // sending auth to RADIUS server
737 case RADIUSSTART: // sending start accounting to RADIUS server
738 case RADIUSSTOP: // sending stop accounting to RADIUS server
739 case RADIUSINTERIM: // sending interim accounting to RADIUS server
740 radiussend(r, radius[r].state);
741 break;
742 default:
743 case RADIUSNULL: // Not in use
744 case RADIUSWAIT: // waiting timeout before available, in case delayed reply from RADIUS server
745 // free up RADIUS task
746 radiusclear(r, s);
747 LOG(3, s, session[s].tunnel, "Freeing up radius session %d\n", r);
748 break;
749 }
750 }
751
752 extern int daefd;
753
754 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
755 {
756 int i, r_code, r_id, length, attribute_length;
757 uint8_t *packet, attribute;
758 hasht hash;
759 char username[MAXUSER] = "";
760 in_addr_t nas = 0;
761 in_addr_t ip = 0;
762 uint32_t port = 0;
763 uint32_t error = 0;
764 sessionidt s = 0;
765 tunnelidt t;
766 int fin = -1;
767 int fout = -1;
768 uint8_t *avpair[64];
769 int avpair_len[sizeof(avpair)/sizeof(*avpair)];
770 int avp = 0;
771 int auth_only = 0;
772 uint8_t *p;
773
774 LOG(3, 0, 0, "DAE request from %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
775 LOG_HEX(5, "DAE Request", buf, len);
776
777 if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
778 {
779 LOG(1, 0, 0, "Duff DAE request length %d\n", len);
780 return;
781 }
782
783 r_code = buf[0]; // request type
784 r_id = buf[1]; // radius indentifier.
785
786 if (r_code != DisconnectRequest && r_code != CoARequest)
787 {
788 LOG(1, 0, 0, "Unrecognised DAE request %s\n", radius_code(r_code));
789 return;
790 }
791
792 if (!config->cluster_iam_master)
793 {
794 master_forward_dae_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
795 return;
796 }
797
798 len = ntohs(*(uint16_t *) (buf + 2));
799
800 LOG(3, 0, 0, "Received DAE %s, id %d\n", radius_code(r_code), r_id);
801
802 // check authenticator
803 calc_auth(buf, len, zero, hash);
804 if (memcmp(hash, buf + 4, 16) != 0)
805 {
806 LOG(1, 0, 0, "Incorrect vector in DAE request (wrong secret in radius config?)\n");
807 return;
808 }
809
810 // unpack attributes
811 packet = buf + 20;
812 length = len - 20;
813
814 while (length > 0)
815 {
816 attribute = *packet++;
817 attribute_length = *packet++;
818 if (attribute_length < 2)
819 break;
820
821 length -= attribute_length;
822 attribute_length -= 2;
823 switch (attribute)
824 {
825 case 1: /* username */
826 len = attribute_length < MAXUSER ? attribute_length : MAXUSER - 1;
827 memcpy(username, packet, len);
828 username[len] = 0;
829 LOG(4, 0, 0, " Received DAE User-Name: %s\n", username);
830 break;
831
832 case 4: /* nas ip address */
833 nas = *(uint32_t *) packet; // net order
834 if (nas != config->bind_address)
835 error = 403; // NAS identification mismatch
836
837 LOG(4, 0, 0, " Received DAE NAS-IP-Address: %s\n", fmtaddr(nas, 0));
838 break;
839
840 case 5: /* nas port */
841 port = ntohl(*(uint32_t *) packet);
842 if (port < 1 || port > MAXSESSION)
843 error = 404;
844
845 LOG(4, 0, 0, " Received DAE NAS-Port: %u\n", port);
846 break;
847
848 case 6: /* service type */
849 {
850 uint32_t service_type = ntohl(*(uint32_t *) packet);
851 auth_only = service_type == 8; // Authenticate only
852
853 LOG(4, 0, 0, " Received DAE Service-Type: %u\n", service_type);
854 }
855 break;
856
857 case 8: /* ip address */
858 ip = *(uint32_t *) packet; // net order
859 LOG(4, 0, 0, " Received DAE Framed-IP-Address: %s\n", fmtaddr(ip, 0));
860 break;
861
862 case 11: /* filter id */
863 LOG(4, 0, 0, " Received DAE Filter-Id: %.*s\n", attribute_length, packet);
864 if (!(p = memchr(packet, '.', attribute_length)))
865 {
866 error = 404; // invalid request
867 break;
868 }
869
870 len = p - packet;
871 i = find_filter((char *) packet, len);
872 if (i < 0 || !*ip_filters[i].name)
873 {
874 error = 404;
875 break;
876 }
877
878 if (!memcmp(p, ".in", attribute_length - len))
879 fin = i + 1;
880 else if (!memcmp(p, ".out", attribute_length - len))
881 fout = i + 1;
882 else
883 error = 404;
884
885 break;
886
887 case 26: /* vendor specific */
888 if (attribute_length >= 6
889 && ntohl(*(uint32_t *) packet) == 9 // Cisco
890 && *(packet + 4) == 1 // Cisco-AVPair
891 && *(packet + 5) >= 2) // length
892 {
893 int len = *(packet + 5) - 2;
894 uint8_t *a = packet + 6;
895
896 LOG(4, 0, 0, " Received DAE Cisco-AVPair: %.*s\n", len, a);
897 if (avp < sizeof(avpair)/sizeof(*avpair) - 1)
898 {
899 avpair[avp] = a;
900 avpair_len[avp++] = len;
901 }
902 }
903 break;
904 }
905
906 packet += attribute_length;
907 }
908
909 if (!error && auth_only)
910 {
911 if (fin != -1 || fout != -1 || avp)
912 error = 401; // unsupported attribute
913 else
914 error = 405; // unsupported service
915 }
916
917 if (!error && !(port || ip || *username))
918 error = 402; // missing attribute
919
920 // exact match for SID if given
921 if (!error && port)
922 {
923 s = port;
924 if (!session[s].opened)
925 error = 503; // not found
926 }
927
928 if (!error && ip)
929 {
930 // find/check session by IP
931 i = sessionbyip(ip);
932 if (!i || (s && s != i)) // not found or mismatching port
933 error = 503;
934 else
935 s = i;
936 }
937
938 if (!error && *username)
939 {
940 if (s)
941 {
942 if (strcmp(session[s].user, username))
943 error = 503;
944 }
945 else if (!(s = sessionbyuser(username)))
946 error = 503;
947 }
948
949 t = session[s].tunnel;
950
951 switch (r_code)
952 {
953 case DisconnectRequest: // Packet of Disconnect/Death
954 if (error)
955 {
956 r_code = DisconnectNAK;
957 break;
958 }
959
960 LOG(3, s, t, " DAE Disconnect %d (%s)\n", s, session[s].user);
961 r_code = DisconnectACK;
962
963 sessionshutdown(s, "Requested by PoD", 3, 0); // disconnect session
964 break;
965
966 case CoARequest: // Change of Authorization
967 if (error)
968 {
969 r_code = CoANAK;
970 break;
971 }
972
973 LOG(3, s, t, " DAE Change %d (%s)\n", s, session[s].user);
974 r_code = CoAACK;
975
976 // reset
977 {
978 struct param_radius_reset p = { &tunnel[session[s].tunnel], &session[s] };
979 run_plugins(PLUGIN_RADIUS_RESET, &p);
980 }
981
982 // apply filters
983 if (fin == -1)
984 fin = 0;
985 else
986 LOG(3, s, t, " Filter in %d (%s)\n", fin, ip_filters[fin - 1].name);
987
988 if (fout == -1)
989 fout = 0;
990 else
991 LOG(3, s, t, " Filter out %d (%s)\n", fout, ip_filters[fout - 1].name);
992
993 filter_session(s, fin, fout);
994
995 // process cisco av-pair(s)
996 for (i = 0; i < avp; i++)
997 {
998 LOG(3, s, t, " Cisco-AVPair: %.*s\n", avpair_len[i], avpair[i]);
999 handle_avpair(s, avpair[i], avpair_len[i]);
1000 }
1001
1002 cluster_send_session(s);
1003 break;
1004 }
1005
1006 // send response
1007 packet = buf;
1008 *packet++ = r_code;
1009 *packet++ = r_id;
1010 // skip len + auth
1011 packet += 2 + 16;
1012 len = packet - buf;
1013
1014 // add attributes
1015 if (error)
1016 {
1017 // add error cause
1018 *packet++ = 101;
1019 *packet++ = 6;
1020 *(uint32_t *) packet = htonl(error);
1021 len += 6;
1022 }
1023
1024 *((uint16_t *)(buf + 2)) = htons(len);
1025
1026 // make vector
1027 calc_auth(buf, len, hash, buf + 4);
1028
1029 LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id);
1030
1031 // send DAE response
1032 if (sendto(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen) < 0)
1033 LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
1034 }
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"