1 /***********************************************************************
2 *
3 * radius.c
4 *
5 * RADIUS plugin for pppd. Performs PAP, CHAP, MS-CHAP, MS-CHAPv2
6 * authentication using RADIUS.
7 *
8 * Copyright (C) 2002 Roaring Penguin Software Inc.
9 *
10 * Based on a patch for ipppd, which is:
11 * Copyright (C) 1996, Matjaz Godec <gody@elgo.si>
12 * Copyright (C) 1996, Lars Fenneberg <in5y050@public.uni-hamburg.de>
13 * Copyright (C) 1997, Miguel A.L. Paraz <map@iphil.net>
14 *
15 * Uses radiusclient library, which is:
16 * Copyright (C) 1995,1996,1997,1998 Lars Fenneberg <lf@elemental.net>
17 * Copyright (C) 2002 Roaring Penguin Software Inc.
18 *
19 * MPPE support is by Ralf Hofmann, <ralf.hofmann@elvido.net>, with
20 * modification from Frank Cusack, <frank@google.com>.
21 *
22 * This plugin may be distributed according to the terms of the GNU
23 * General Public License, version 2 or (at your option) any later version.
24 *
25 ***********************************************************************/
26 static char const RCSID[] =
27 "$Id: radius.c,v 1.28 2004/11/14 10:27:57 paulus Exp $";
28
29 #include "pppd.h"
30 #include "chap-new.h"
31 #ifdef CHAPMS
32 #include "chap_ms.h"
33 #ifdef MPPE
34 #include "md5.h"
35 #endif
36 #endif
37 #include "radiusclient.h"
38 #include "fsm.h"
39 #include "ipcp.h"
40 #include <syslog.h>
41 #include <sys/types.h>
42 #include <sys/time.h>
43 #include <string.h>
44 #include <netinet/in.h>
45 #include <stdlib.h>
46
47 #define BUF_LEN 1024
48
49 #define MD5_HASH_SIZE 16
50
51 static char *config_file = NULL;
52 static int add_avp(char **);
53 static struct avpopt {
54 char *vpstr;
55 struct avpopt *next;
56 } *avpopt = NULL;
57 static bool portnummap = 0;
58
59 static option_t Options[] = {
60 { "radius-config-file", o_string, &config_file },
61 { "avpair", o_special, add_avp },
62 { "map-to-ttyname", o_bool, &portnummap,
63 "Set Radius NAS-Port attribute value via libradiusclient library", OPT_PRIO | 1 },
64 { "map-to-ifname", o_bool, &portnummap,
65 "Set Radius NAS-Port attribute to number as in interface name (Default)", OPT_PRIOSUB | 0 },
66 { NULL }
67 };
68
69 static int radius_secret_check(void);
70 static int radius_pap_auth(char *user,
71 char *passwd,
72 char **msgp,
73 struct wordlist **paddrs,
74 struct wordlist **popts);
75 static int radius_chap_verify(char *user, char *ourname, int id,
76 struct chap_digest_type *digest,
77 unsigned char *challenge,
78 unsigned char *response,
79 char *message, int message_space);
80
81 static void radius_ip_up(void *opaque, int arg);
82 static void radius_ip_down(void *opaque, int arg);
83 static void make_username_realm(char *user);
84 static int radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
85 struct chap_digest_type *digest,
86 unsigned char *challenge,
87 char *message, int message_space);
88 static void radius_choose_ip(u_int32_t *addrp);
89 static int radius_init(char *msg);
90 static int get_client_port(char *ifname);
91 static int radius_allowed_address(u_int32_t addr);
92 static void radius_acct_interim(void *);
93 #ifdef MPPE
94 static int radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
95 unsigned char *);
96 static int radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info);
97 #endif
98
99 #ifndef MAXSESSIONID
100 #define MAXSESSIONID 32
101 #endif
102
103 #ifndef MAXCLASSLEN
104 #define MAXCLASSLEN 500
105 #endif
106
107 struct radius_state {
108 int accounting_started;
109 int initialized;
110 int client_port;
111 int choose_ip;
112 int any_ip_addr_ok;
113 int done_chap_once;
114 u_int32_t ip_addr;
115 char user[MAXNAMELEN];
116 char config_file[MAXPATHLEN];
117 char session_id[MAXSESSIONID + 1];
118 time_t start_time;
119 int acct_interim_interval;
120 SERVER *authserver; /* Authentication server to use */
121 SERVER *acctserver; /* Accounting server to use */
122 int class_len;
123 char class[MAXCLASSLEN];
124 VALUE_PAIR *avp; /* Additional (user supplied) vp's to send to server */
125 };
126
127 void (*radius_attributes_hook)(VALUE_PAIR *) = NULL;
128
129 /* The pre_auth_hook MAY set authserver and acctserver if it wants.
130 In that case, they override the values in the radiusclient.conf file */
131 void (*radius_pre_auth_hook)(char const *user,
132 SERVER **authserver,
133 SERVER **acctserver) = NULL;
134
135 static struct radius_state rstate;
136
137 char pppd_version[] = VERSION;
138
139 /**********************************************************************
140 * %FUNCTION: plugin_init
141 * %ARGUMENTS:
142 * None
143 * %RETURNS:
144 * Nothing
145 * %DESCRIPTION:
146 * Initializes RADIUS plugin.
147 ***********************************************************************/
148 void
plugin_init(void)149 plugin_init(void)
150 {
151 pap_check_hook = radius_secret_check;
152 pap_auth_hook = radius_pap_auth;
153
154 chap_check_hook = radius_secret_check;
155 chap_verify_hook = radius_chap_verify;
156
157 ip_choose_hook = radius_choose_ip;
158 allowed_address_hook = radius_allowed_address;
159
160 add_notifier(&ip_up_notifier, radius_ip_up, NULL);
161 add_notifier(&ip_down_notifier, radius_ip_down, NULL);
162
163 memset(&rstate, 0, sizeof(rstate));
164
165 strlcpy(rstate.config_file, "/etc/radiusclient/radiusclient.conf",
166 sizeof(rstate.config_file));
167
168 add_options(Options);
169
170 info("RADIUS plugin initialized.");
171 }
172
173 /**********************************************************************
174 * %FUNCTION: add_avp
175 * %ARGUMENTS:
176 * argv -- the <attribute=value> pair to add
177 * %RETURNS:
178 * 1
179 * %DESCRIPTION:
180 * Adds an av pair to be passed on to the RADIUS server on each request.
181 ***********************************************************************/
182 static int
add_avp(char ** argv)183 add_avp(char **argv)
184 {
185 struct avpopt *p = malloc(sizeof(struct avpopt));
186
187 /* Append to a list of vp's for later parsing */
188 p->vpstr = strdup(*argv);
189 p->next = avpopt;
190 avpopt = p;
191
192 return 1;
193 }
194
195 /**********************************************************************
196 * %FUNCTION: radius_secret_check
197 * %ARGUMENTS:
198 * None
199 * %RETURNS:
200 * 1 -- we are ALWAYS willing to supply a secret. :-)
201 * %DESCRIPTION:
202 * Tells pppd that we will try to authenticate the peer, and not to
203 * worry about looking in /etc/ppp/*-secrets
204 ***********************************************************************/
205 static int
radius_secret_check(void)206 radius_secret_check(void)
207 {
208 return 1;
209 }
210
211 /**********************************************************************
212 * %FUNCTION: radius_choose_ip
213 * %ARGUMENTS:
214 * addrp -- where to store the IP address
215 * %RETURNS:
216 * Nothing
217 * %DESCRIPTION:
218 * If RADIUS server has specified an IP address, it is stored in *addrp.
219 ***********************************************************************/
220 static void
radius_choose_ip(u_int32_t * addrp)221 radius_choose_ip(u_int32_t *addrp)
222 {
223 if (rstate.choose_ip) {
224 *addrp = rstate.ip_addr;
225 }
226 }
227
228 /**********************************************************************
229 * %FUNCTION: radius_pap_auth
230 * %ARGUMENTS:
231 * user -- user-name of peer
232 * passwd -- password supplied by peer
233 * msgp -- Message which will be sent in PAP response
234 * paddrs -- set to a list of possible peer IP addresses
235 * popts -- set to a list of additional pppd options
236 * %RETURNS:
237 * 1 if we can authenticate, -1 if we cannot.
238 * %DESCRIPTION:
239 * Performs PAP authentication using RADIUS
240 ***********************************************************************/
241 static int
radius_pap_auth(char * user,char * passwd,char ** msgp,struct wordlist ** paddrs,struct wordlist ** popts)242 radius_pap_auth(char *user,
243 char *passwd,
244 char **msgp,
245 struct wordlist **paddrs,
246 struct wordlist **popts)
247 {
248 VALUE_PAIR *send, *received;
249 UINT4 av_type;
250 int result;
251 static char radius_msg[BUF_LEN];
252
253 radius_msg[0] = 0;
254 *msgp = radius_msg;
255
256 if (radius_init(radius_msg) < 0) {
257 return 0;
258 }
259
260 /* Put user with potentially realm added in rstate.user */
261 make_username_realm(user);
262
263 if (radius_pre_auth_hook) {
264 radius_pre_auth_hook(rstate.user,
265 &rstate.authserver,
266 &rstate.acctserver);
267 }
268
269 send = NULL;
270 received = NULL;
271
272 /* Hack... the "port" is the ppp interface number. Should really be
273 the tty */
274 rstate.client_port = get_client_port(portnummap ? devnam : ifname);
275
276 av_type = PW_FRAMED;
277 rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
278
279 av_type = PW_PPP;
280 rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
281
282 rc_avpair_add(&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
283 rc_avpair_add(&send, PW_USER_PASSWORD, passwd, 0, VENDOR_NONE);
284 if (*remote_number) {
285 rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
286 VENDOR_NONE);
287 } else if (ipparam)
288 rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
289
290 /* Add user specified vp's */
291 if (rstate.avp)
292 rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
293
294 if (rstate.authserver) {
295 result = rc_auth_using_server(rstate.authserver,
296 rstate.client_port, send,
297 &received, radius_msg, NULL);
298 } else {
299 result = rc_auth(rstate.client_port, send, &received, radius_msg, NULL);
300 }
301
302 if (result == OK_RC) {
303 if (radius_setparams(received, radius_msg, NULL, NULL, NULL, NULL, 0) < 0) {
304 result = ERROR_RC;
305 }
306 }
307
308 /* free value pairs */
309 rc_avpair_free(received);
310 rc_avpair_free(send);
311
312 return (result == OK_RC) ? 1 : 0;
313 }
314
315 /**********************************************************************
316 * %FUNCTION: radius_chap_verify
317 * %ARGUMENTS:
318 * user -- name of the peer
319 * ourname -- name for this machine
320 * id -- the ID byte in the challenge
321 * digest -- points to the structure representing the digest type
322 * challenge -- the challenge string we sent (length in first byte)
323 * response -- the response (hash) the peer sent back (length in 1st byte)
324 * message -- space for a message to be returned to the peer
325 * message_space -- number of bytes available at *message.
326 * %RETURNS:
327 * 1 if the response is good, 0 if it is bad
328 * %DESCRIPTION:
329 * Performs CHAP, MS-CHAP and MS-CHAPv2 authentication using RADIUS.
330 ***********************************************************************/
331 static int
radius_chap_verify(char * user,char * ourname,int id,struct chap_digest_type * digest,unsigned char * challenge,unsigned char * response,char * message,int message_space)332 radius_chap_verify(char *user, char *ourname, int id,
333 struct chap_digest_type *digest,
334 unsigned char *challenge, unsigned char *response,
335 char *message, int message_space)
336 {
337 VALUE_PAIR *send, *received;
338 UINT4 av_type;
339 static char radius_msg[BUF_LEN];
340 int result;
341 int challenge_len, response_len;
342 u_char cpassword[MAX_RESPONSE_LEN + 1];
343 #ifdef MPPE
344 /* Need the RADIUS secret and Request Authenticator to decode MPPE */
345 REQUEST_INFO request_info, *req_info = &request_info;
346 #else
347 REQUEST_INFO *req_info = NULL;
348 #endif
349
350 challenge_len = *challenge++;
351 response_len = *response++;
352
353 radius_msg[0] = 0;
354
355 if (radius_init(radius_msg) < 0) {
356 error("%s", radius_msg);
357 return 0;
358 }
359
360 /* return error for types we can't handle */
361 if ((digest->code != CHAP_MD5)
362 #ifdef CHAPMS
363 && (digest->code != CHAP_MICROSOFT)
364 && (digest->code != CHAP_MICROSOFT_V2)
365 #endif
366 ) {
367 error("RADIUS: Challenge type %u unsupported", digest->code);
368 return 0;
369 }
370
371 /* Put user with potentially realm added in rstate.user */
372 if (!rstate.done_chap_once) {
373 make_username_realm(user);
374 rstate.client_port = get_client_port (portnummap ? devnam : ifname);
375 if (radius_pre_auth_hook) {
376 radius_pre_auth_hook(rstate.user,
377 &rstate.authserver,
378 &rstate.acctserver);
379 }
380 }
381
382 send = received = NULL;
383
384 av_type = PW_FRAMED;
385 rc_avpair_add (&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
386
387 av_type = PW_PPP;
388 rc_avpair_add (&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
389
390 rc_avpair_add (&send, PW_USER_NAME, rstate.user , 0, VENDOR_NONE);
391
392 /*
393 * add the challenge and response fields
394 */
395 switch (digest->code) {
396 case CHAP_MD5:
397 /* CHAP-Challenge and CHAP-Password */
398 if (response_len != MD5_HASH_SIZE)
399 return 0;
400 cpassword[0] = id;
401 memcpy(&cpassword[1], response, MD5_HASH_SIZE);
402
403 rc_avpair_add(&send, PW_CHAP_CHALLENGE,
404 challenge, challenge_len, VENDOR_NONE);
405 rc_avpair_add(&send, PW_CHAP_PASSWORD,
406 cpassword, MD5_HASH_SIZE + 1, VENDOR_NONE);
407 break;
408
409 #ifdef CHAPMS
410 case CHAP_MICROSOFT:
411 {
412 /* MS-CHAP-Challenge and MS-CHAP-Response */
413 MS_ChapResponse *rmd = (MS_ChapResponse *) response;
414 u_char *p = cpassword;
415
416 if (response_len != MS_CHAP_RESPONSE_LEN)
417 return 0;
418 *p++ = id;
419 /* The idiots use a different field order in RADIUS than PPP */
420 memcpy(p, rmd->UseNT, sizeof(rmd->UseNT));
421 p += sizeof(rmd->UseNT);
422 memcpy(p, rmd->LANManResp, sizeof(rmd->LANManResp));
423 p += sizeof(rmd->LANManResp);
424 memcpy(p, rmd->NTResp, sizeof(rmd->NTResp));
425
426 rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
427 challenge, challenge_len, VENDOR_MICROSOFT);
428 rc_avpair_add(&send, PW_MS_CHAP_RESPONSE,
429 cpassword, MS_CHAP_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
430 break;
431 }
432
433 case CHAP_MICROSOFT_V2:
434 {
435 /* MS-CHAP-Challenge and MS-CHAP2-Response */
436 MS_Chap2Response *rmd = (MS_Chap2Response *) response;
437 u_char *p = cpassword;
438
439 if (response_len != MS_CHAP2_RESPONSE_LEN)
440 return 0;
441 *p++ = id;
442 /* The idiots use a different field order in RADIUS than PPP */
443 memcpy(p, rmd->Flags, sizeof(rmd->Flags));
444 p += sizeof(rmd->Flags);
445 memcpy(p, rmd->PeerChallenge, sizeof(rmd->PeerChallenge));
446 p += sizeof(rmd->PeerChallenge);
447 memcpy(p, rmd->Reserved, sizeof(rmd->Reserved));
448 p += sizeof(rmd->Reserved);
449 memcpy(p, rmd->NTResp, sizeof(rmd->NTResp));
450
451 rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
452 challenge, challenge_len, VENDOR_MICROSOFT);
453 rc_avpair_add(&send, PW_MS_CHAP2_RESPONSE,
454 cpassword, MS_CHAP2_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
455 break;
456 }
457 #endif
458 }
459
460 if (*remote_number) {
461 rc_avpair_add(&send, PW_CALLING_STATION_ID, remote_number, 0,
462 VENDOR_NONE);
463 } else if (ipparam)
464 rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
465
466 /* Add user specified vp's */
467 if (rstate.avp)
468 rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
469
470 /*
471 * make authentication with RADIUS server
472 */
473
474 if (rstate.authserver) {
475 result = rc_auth_using_server(rstate.authserver,
476 rstate.client_port, send,
477 &received, radius_msg, req_info);
478 } else {
479 result = rc_auth(rstate.client_port, send, &received, radius_msg,
480 req_info);
481 }
482
483 if (result == OK_RC) {
484 if (!rstate.done_chap_once) {
485 if (radius_setparams(received, radius_msg, req_info, digest,
486 challenge, message, message_space) < 0) {
487 error("%s", radius_msg);
488 result = ERROR_RC;
489 } else {
490 rstate.done_chap_once = 1;
491 }
492 }
493 }
494
495 rc_avpair_free(received);
496 rc_avpair_free (send);
497 return (result == OK_RC);
498 }
499
500 /**********************************************************************
501 * %FUNCTION: make_username_realm
502 * %ARGUMENTS:
503 * user -- the user given to pppd
504 * %RETURNS:
505 * Nothing
506 * %DESCRIPTION:
507 * Copies user into rstate.user. If it lacks a realm (no "@domain" part),
508 * then the default realm from the radiusclient config file is added.
509 ***********************************************************************/
510 static void
make_username_realm(char * user)511 make_username_realm(char *user)
512 {
513 char *default_realm;
514
515 if ( user != NULL ) {
516 strlcpy(rstate.user, user, sizeof(rstate.user));
517 } else {
518 rstate.user[0] = 0;
519 }
520
521 default_realm = rc_conf_str("default_realm");
522
523 if (!strchr(rstate.user, '@') &&
524 default_realm &&
525 (*default_realm != '\0')) {
526 strlcat(rstate.user, "@", sizeof(rstate.user));
527 strlcat(rstate.user, default_realm, sizeof(rstate.user));
528 }
529 }
530
531 /**********************************************************************
532 * %FUNCTION: radius_setparams
533 * %ARGUMENTS:
534 * vp -- received value-pairs
535 * msg -- buffer in which to place error message. Holds up to BUF_LEN chars
536 * %RETURNS:
537 * >= 0 on success; -1 on failure
538 * %DESCRIPTION:
539 * Parses attributes sent by RADIUS server and sets them in pppd.
540 ***********************************************************************/
541 static int
radius_setparams(VALUE_PAIR * vp,char * msg,REQUEST_INFO * req_info,struct chap_digest_type * digest,unsigned char * challenge,char * message,int message_space)542 radius_setparams(VALUE_PAIR *vp, char *msg, REQUEST_INFO *req_info,
543 struct chap_digest_type *digest, unsigned char *challenge,
544 char *message, int message_space)
545 {
546 u_int32_t remote;
547 int ms_chap2_success = 0;
548 #ifdef MPPE
549 int mppe_enc_keys = 0; /* whether or not these were received */
550 int mppe_enc_policy = 0;
551 int mppe_enc_types = 0;
552 #endif
553
554 /* Send RADIUS attributes to anyone else who might be interested */
555 if (radius_attributes_hook) {
556 (*radius_attributes_hook)(vp);
557 }
558
559 /*
560 * service type (if not framed then quit),
561 * new IP address (RADIUS can define static IP for some users),
562 */
563
564 while (vp) {
565 if (vp->vendorcode == VENDOR_NONE) {
566 switch (vp->attribute) {
567 case PW_SERVICE_TYPE:
568 /* check for service type */
569 /* if not FRAMED then exit */
570 if (vp->lvalue != PW_FRAMED) {
571 slprintf(msg, BUF_LEN, "RADIUS: wrong service type %ld for %s",
572 vp->lvalue, rstate.user);
573 return -1;
574 }
575 break;
576
577 case PW_FRAMED_PROTOCOL:
578 /* check for framed protocol type */
579 /* if not PPP then also exit */
580 if (vp->lvalue != PW_PPP) {
581 slprintf(msg, BUF_LEN, "RADIUS: wrong framed protocol %ld for %s",
582 vp->lvalue, rstate.user);
583 return -1;
584 }
585 break;
586
587 case PW_SESSION_TIMEOUT:
588 /* Session timeout */
589 maxconnect = vp->lvalue;
590 break;
591 #ifdef MAXOCTETS
592 case PW_SESSION_OCTETS_LIMIT:
593 /* Session traffic limit */
594 maxoctets = vp->lvalue;
595 break;
596 case PW_OCTETS_DIRECTION:
597 /* Session traffic limit direction check */
598 maxoctets_dir = ( vp->lvalue > 4 ) ? 0 : vp->lvalue ;
599 break;
600 #endif
601 case PW_ACCT_INTERIM_INTERVAL:
602 /* Send accounting updates every few seconds */
603 rstate.acct_interim_interval = vp->lvalue;
604 /* RFC says it MUST NOT be less than 60 seconds */
605 /* We use "0" to signify not sending updates */
606 if (rstate.acct_interim_interval &&
607 rstate.acct_interim_interval < 60) {
608 rstate.acct_interim_interval = 60;
609 }
610 break;
611 case PW_FRAMED_IP_ADDRESS:
612 /* seting up remote IP addresses */
613 remote = vp->lvalue;
614 if (remote == 0xffffffff) {
615 /* 0xffffffff means user should be allowed to select one */
616 rstate.any_ip_addr_ok = 1;
617 } else if (remote != 0xfffffffe) {
618 /* 0xfffffffe means NAS should select an ip address */
619 remote = htonl(vp->lvalue);
620 if (bad_ip_adrs (remote)) {
621 slprintf(msg, BUF_LEN, "RADIUS: bad remote IP address %I for %s",
622 remote, rstate.user);
623 return -1;
624 }
625 rstate.choose_ip = 1;
626 rstate.ip_addr = remote;
627 }
628 break;
629 case PW_CLASS:
630 /* Save Class attribute to pass it in accounting request */
631 if (vp->lvalue <= MAXCLASSLEN) {
632 rstate.class_len=vp->lvalue;
633 memcpy(rstate.class, vp->strvalue, rstate.class_len);
634 } /* else too big for our buffer - ignore it */
635 break;
636 }
637
638
639 #ifdef CHAPMS
640 } else if (vp->vendorcode == VENDOR_MICROSOFT) {
641 switch (vp->attribute) {
642 case PW_MS_CHAP2_SUCCESS:
643 if ((vp->lvalue != 43) || strncmp(vp->strvalue + 1, "S=", 2)) {
644 slprintf(msg,BUF_LEN,"RADIUS: bad MS-CHAP2-Success packet");
645 return -1;
646 }
647 if (message != NULL)
648 strlcpy(message, vp->strvalue + 1, message_space);
649 ms_chap2_success = 1;
650 break;
651
652 #ifdef MPPE
653 case PW_MS_CHAP_MPPE_KEYS:
654 if (radius_setmppekeys(vp, req_info, challenge) < 0) {
655 slprintf(msg, BUF_LEN,
656 "RADIUS: bad MS-CHAP-MPPE-Keys attribute");
657 return -1;
658 }
659 mppe_enc_keys = 1;
660 break;
661
662 case PW_MS_MPPE_SEND_KEY:
663 case PW_MS_MPPE_RECV_KEY:
664 if (radius_setmppekeys2(vp, req_info) < 0) {
665 slprintf(msg, BUF_LEN,
666 "RADIUS: bad MS-MPPE-%s-Key attribute",
667 (vp->attribute == PW_MS_MPPE_SEND_KEY)?
668 "Send": "Recv");
669 return -1;
670 }
671 mppe_enc_keys = 1;
672 break;
673
674 case PW_MS_MPPE_ENCRYPTION_POLICY:
675 mppe_enc_policy = vp->lvalue; /* save for later */
676 break;
677
678 case PW_MS_MPPE_ENCRYPTION_TYPES:
679 mppe_enc_types = vp->lvalue; /* save for later */
680 break;
681
682 #endif /* MPPE */
683 #if 0
684 case PW_MS_PRIMARY_DNS_SERVER:
685 case PW_MS_SECONDARY_DNS_SERVER:
686 case PW_MS_PRIMARY_NBNS_SERVER:
687 case PW_MS_SECONDARY_NBNS_SERVER:
688 break;
689 #endif
690 }
691 #endif /* CHAPMS */
692 }
693 vp = vp->next;
694 }
695
696 /* Require a valid MS-CHAP2-SUCCESS for MS-CHAPv2 auth */
697 if (digest && (digest->code == CHAP_MICROSOFT_V2) && !ms_chap2_success)
698 return -1;
699
700 #ifdef MPPE
701 /*
702 * Require both policy and key attributes to indicate a valid key.
703 * Note that if the policy value was '0' we don't set the key!
704 */
705 if (mppe_enc_policy && mppe_enc_keys) {
706 mppe_keys_set = 1;
707 /* Set/modify allowed encryption types. */
708 if (mppe_enc_types)
709 set_mppe_enc_types(mppe_enc_policy, mppe_enc_types);
710 }
711 #endif
712
713 return 0;
714 }
715
716 #ifdef MPPE
717 /**********************************************************************
718 * %FUNCTION: radius_setmppekeys
719 * %ARGUMENTS:
720 * vp -- value pair holding MS-CHAP-MPPE-KEYS attribute
721 * req_info -- radius request information used for encryption
722 * %RETURNS:
723 * >= 0 on success; -1 on failure
724 * %DESCRIPTION:
725 * Decrypt the "key" provided by the RADIUS server for MPPE encryption.
726 * See RFC 2548.
727 ***********************************************************************/
728 static int
radius_setmppekeys(VALUE_PAIR * vp,REQUEST_INFO * req_info,unsigned char * challenge)729 radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
730 unsigned char *challenge)
731 {
732 int i;
733 MD5_CTX Context;
734 u_char plain[32];
735 u_char buf[16];
736
737 if (vp->lvalue != 32) {
738 error("RADIUS: Incorrect attribute length (%d) for MS-CHAP-MPPE-Keys",
739 vp->lvalue);
740 return -1;
741 }
742
743 memcpy(plain, vp->strvalue, sizeof(plain));
744
745 MD5_Init(&Context);
746 MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
747 MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
748 MD5_Final(buf, &Context);
749
750 for (i = 0; i < 16; i++)
751 plain[i] ^= buf[i];
752
753 MD5_Init(&Context);
754 MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
755 MD5_Update(&Context, vp->strvalue, 16);
756 MD5_Final(buf, &Context);
757
758 for(i = 0; i < 16; i++)
759 plain[i + 16] ^= buf[i];
760
761 /*
762 * Annoying. The "key" returned is just the NTPasswordHashHash, which
763 * the NAS (us) doesn't need; we only need the start key. So we have
764 * to generate the start key, sigh. NB: We do not support the LM-Key.
765 */
766 mppe_set_keys(challenge, &plain[8]);
767
768 return 0;
769 }
770
771 /**********************************************************************
772 * %FUNCTION: radius_setmppekeys2
773 * %ARGUMENTS:
774 * vp -- value pair holding MS-MPPE-SEND-KEY or MS-MPPE-RECV-KEY attribute
775 * req_info -- radius request information used for encryption
776 * %RETURNS:
777 * >= 0 on success; -1 on failure
778 * %DESCRIPTION:
779 * Decrypt the key provided by the RADIUS server for MPPE encryption.
780 * See RFC 2548.
781 ***********************************************************************/
782 static int
radius_setmppekeys2(VALUE_PAIR * vp,REQUEST_INFO * req_info)783 radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info)
784 {
785 int i;
786 MD5_CTX Context;
787 u_char *salt = vp->strvalue;
788 u_char *crypt = vp->strvalue + 2;
789 u_char plain[32];
790 u_char buf[MD5_HASH_SIZE];
791 char *type = "Send";
792
793 if (vp->attribute == PW_MS_MPPE_RECV_KEY)
794 type = "Recv";
795
796 if (vp->lvalue != 34) {
797 error("RADIUS: Incorrect attribute length (%d) for MS-MPPE-%s-Key",
798 vp->lvalue, type);
799 return -1;
800 }
801
802 if ((salt[0] & 0x80) == 0) {
803 error("RADIUS: Illegal salt value for MS-MPPE-%s-Key attribute", type);
804 return -1;
805 }
806
807 memcpy(plain, crypt, 32);
808
809 MD5_Init(&Context);
810 MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
811 MD5_Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
812 MD5_Update(&Context, salt, 2);
813 MD5_Final(buf, &Context);
814
815 for (i = 0; i < 16; i++)
816 plain[i] ^= buf[i];
817
818 if (plain[0] != sizeof(mppe_send_key) /* 16 */) {
819 error("RADIUS: Incorrect key length (%d) for MS-MPPE-%s-Key attribute",
820 (int) plain[0], type);
821 return -1;
822 }
823
824 MD5_Init(&Context);
825 MD5_Update(&Context, req_info->secret, strlen(req_info->secret));
826 MD5_Update(&Context, crypt, 16);
827 MD5_Final(buf, &Context);
828
829 plain[16] ^= buf[0]; /* only need the first byte */
830
831 if (vp->attribute == PW_MS_MPPE_SEND_KEY)
832 memcpy(mppe_send_key, plain + 1, 16);
833 else
834 memcpy(mppe_recv_key, plain + 1, 16);
835
836 return 0;
837 }
838 #endif /* MPPE */
839
840 /**********************************************************************
841 * %FUNCTION: radius_acct_start
842 * %ARGUMENTS:
843 * None
844 * %RETURNS:
845 * Nothing
846 * %DESCRIPTION:
847 * Sends a "start" accounting message to the RADIUS server.
848 ***********************************************************************/
849 static void
radius_acct_start(void)850 radius_acct_start(void)
851 {
852 UINT4 av_type;
853 int result;
854 VALUE_PAIR *send = NULL;
855 ipcp_options *ho = &ipcp_hisoptions[0];
856 u_int32_t hisaddr;
857
858 if (!rstate.initialized) {
859 return;
860 }
861
862 rstate.start_time = time(NULL);
863
864 strncpy(rstate.session_id, rc_mksid(), sizeof(rstate.session_id));
865
866 rc_avpair_add(&send, PW_ACCT_SESSION_ID,
867 rstate.session_id, 0, VENDOR_NONE);
868 rc_avpair_add(&send, PW_USER_NAME,
869 rstate.user, 0, VENDOR_NONE);
870
871 if (rstate.class_len > 0)
872 rc_avpair_add(&send, PW_CLASS,
873 rstate.class, rstate.class_len, VENDOR_NONE);
874
875 av_type = PW_STATUS_START;
876 rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
877
878 av_type = PW_FRAMED;
879 rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
880
881 av_type = PW_PPP;
882 rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
883
884 if (*remote_number) {
885 rc_avpair_add(&send, PW_CALLING_STATION_ID,
886 remote_number, 0, VENDOR_NONE);
887 } else if (ipparam)
888 rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
889
890 av_type = PW_RADIUS;
891 rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
892
893
894 av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
895 rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
896
897 hisaddr = ho->hisaddr;
898 av_type = htonl(hisaddr);
899 rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
900
901 /* Add user specified vp's */
902 if (rstate.avp)
903 rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
904
905 if (rstate.acctserver) {
906 result = rc_acct_using_server(rstate.acctserver,
907 rstate.client_port, send);
908 } else {
909 result = rc_acct(rstate.client_port, send);
910 }
911
912 rc_avpair_free(send);
913
914 if (result != OK_RC) {
915 /* RADIUS server could be down so make this a warning */
916 syslog(LOG_WARNING,
917 "Accounting START failed for %s", rstate.user);
918 } else {
919 rstate.accounting_started = 1;
920 /* Kick off periodic accounting reports */
921 if (rstate.acct_interim_interval) {
922 TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
923 }
924 }
925 }
926
927 /**********************************************************************
928 * %FUNCTION: radius_acct_stop
929 * %ARGUMENTS:
930 * None
931 * %RETURNS:
932 * Nothing
933 * %DESCRIPTION:
934 * Sends a "stop" accounting message to the RADIUS server.
935 ***********************************************************************/
936 static void
radius_acct_stop(void)937 radius_acct_stop(void)
938 {
939 UINT4 av_type;
940 VALUE_PAIR *send = NULL;
941 ipcp_options *ho = &ipcp_hisoptions[0];
942 u_int32_t hisaddr;
943 int result;
944
945 if (!rstate.initialized) {
946 return;
947 }
948
949 if (!rstate.accounting_started) {
950 return;
951 }
952
953 rstate.accounting_started = 0;
954 rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
955 0, VENDOR_NONE);
956
957 rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
958
959 av_type = PW_STATUS_STOP;
960 rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
961
962 av_type = PW_FRAMED;
963 rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
964
965 av_type = PW_PPP;
966 rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
967
968 av_type = PW_RADIUS;
969 rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
970
971
972 if (link_stats_valid) {
973 av_type = link_connect_time;
974 rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
975
976 av_type = link_stats.bytes_out;
977 rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
978
979 av_type = link_stats.bytes_in;
980 rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
981
982 av_type = link_stats.pkts_out;
983 rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
984
985 av_type = link_stats.pkts_in;
986 rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
987 }
988
989 if (*remote_number) {
990 rc_avpair_add(&send, PW_CALLING_STATION_ID,
991 remote_number, 0, VENDOR_NONE);
992 } else if (ipparam)
993 rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
994
995 av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
996 rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
997
998 av_type = PW_NAS_ERROR;
999 switch( status ) {
1000 case EXIT_OK:
1001 case EXIT_USER_REQUEST:
1002 av_type = PW_USER_REQUEST;
1003 break;
1004
1005 case EXIT_HANGUP:
1006 case EXIT_PEER_DEAD:
1007 case EXIT_CONNECT_FAILED:
1008 av_type = PW_LOST_CARRIER;
1009 break;
1010
1011 case EXIT_INIT_FAILED:
1012 case EXIT_OPEN_FAILED:
1013 case EXIT_LOCK_FAILED:
1014 case EXIT_PTYCMD_FAILED:
1015 av_type = PW_PORT_ERROR;
1016 break;
1017
1018 case EXIT_PEER_AUTH_FAILED:
1019 case EXIT_AUTH_TOPEER_FAILED:
1020 case EXIT_NEGOTIATION_FAILED:
1021 case EXIT_CNID_AUTH_FAILED:
1022 av_type = PW_SERVICE_UNAVAILABLE;
1023 break;
1024
1025 case EXIT_IDLE_TIMEOUT:
1026 av_type = PW_ACCT_IDLE_TIMEOUT;
1027 break;
1028
1029 case EXIT_CONNECT_TIME:
1030 av_type = PW_ACCT_SESSION_TIMEOUT;
1031 break;
1032
1033 #ifdef MAXOCTETS
1034 case EXIT_TRAFFIC_LIMIT:
1035 av_type = PW_NAS_REQUEST;
1036 break;
1037 #endif
1038
1039 default:
1040 av_type = PW_NAS_ERROR;
1041 break;
1042 }
1043 rc_avpair_add(&send, PW_ACCT_TERMINATE_CAUSE, &av_type, 0, VENDOR_NONE);
1044
1045 hisaddr = ho->hisaddr;
1046 av_type = htonl(hisaddr);
1047 rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
1048
1049 /* Add user specified vp's */
1050 if (rstate.avp)
1051 rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
1052
1053 if (rstate.acctserver) {
1054 result = rc_acct_using_server(rstate.acctserver,
1055 rstate.client_port, send);
1056 } else {
1057 result = rc_acct(rstate.client_port, send);
1058 }
1059
1060 if (result != OK_RC) {
1061 /* RADIUS server could be down so make this a warning */
1062 syslog(LOG_WARNING,
1063 "Accounting STOP failed for %s", rstate.user);
1064 }
1065 rc_avpair_free(send);
1066 }
1067
1068 /**********************************************************************
1069 * %FUNCTION: radius_acct_interim
1070 * %ARGUMENTS:
1071 * None
1072 * %RETURNS:
1073 * Nothing
1074 * %DESCRIPTION:
1075 * Sends an interim accounting message to the RADIUS server
1076 ***********************************************************************/
1077 static void
radius_acct_interim(void * ignored)1078 radius_acct_interim(void *ignored)
1079 {
1080 UINT4 av_type;
1081 VALUE_PAIR *send = NULL;
1082 ipcp_options *ho = &ipcp_hisoptions[0];
1083 u_int32_t hisaddr;
1084 int result;
1085
1086 if (!rstate.initialized) {
1087 return;
1088 }
1089
1090 if (!rstate.accounting_started) {
1091 return;
1092 }
1093
1094 rc_avpair_add(&send, PW_ACCT_SESSION_ID, rstate.session_id,
1095 0, VENDOR_NONE);
1096
1097 rc_avpair_add(&send, PW_USER_NAME, rstate.user, 0, VENDOR_NONE);
1098
1099 av_type = PW_STATUS_ALIVE;
1100 rc_avpair_add(&send, PW_ACCT_STATUS_TYPE, &av_type, 0, VENDOR_NONE);
1101
1102 av_type = PW_FRAMED;
1103 rc_avpair_add(&send, PW_SERVICE_TYPE, &av_type, 0, VENDOR_NONE);
1104
1105 av_type = PW_PPP;
1106 rc_avpair_add(&send, PW_FRAMED_PROTOCOL, &av_type, 0, VENDOR_NONE);
1107
1108 av_type = PW_RADIUS;
1109 rc_avpair_add(&send, PW_ACCT_AUTHENTIC, &av_type, 0, VENDOR_NONE);
1110
1111 /* Update link stats */
1112 update_link_stats(0);
1113
1114 if (link_stats_valid) {
1115 link_stats_valid = 0; /* Force later code to update */
1116
1117 av_type = link_connect_time;
1118 rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
1119
1120 av_type = link_stats.bytes_out;
1121 rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
1122
1123 av_type = link_stats.bytes_in;
1124 rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
1125
1126 av_type = link_stats.pkts_out;
1127 rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
1128
1129 av_type = link_stats.pkts_in;
1130 rc_avpair_add(&send, PW_ACCT_INPUT_PACKETS, &av_type, 0, VENDOR_NONE);
1131 }
1132
1133 if (*remote_number) {
1134 rc_avpair_add(&send, PW_CALLING_STATION_ID,
1135 remote_number, 0, VENDOR_NONE);
1136 } else if (ipparam)
1137 rc_avpair_add(&send, PW_CALLING_STATION_ID, ipparam, 0, VENDOR_NONE);
1138
1139 av_type = ( using_pty ? PW_VIRTUAL : ( sync_serial ? PW_SYNC : PW_ASYNC ) );
1140 rc_avpair_add(&send, PW_NAS_PORT_TYPE, &av_type, 0, VENDOR_NONE);
1141
1142 hisaddr = ho->hisaddr;
1143 av_type = htonl(hisaddr);
1144 rc_avpair_add(&send, PW_FRAMED_IP_ADDRESS , &av_type , 0, VENDOR_NONE);
1145
1146 /* Add user specified vp's */
1147 if (rstate.avp)
1148 rc_avpair_insert(&send, NULL, rc_avpair_copy(rstate.avp));
1149
1150 if (rstate.acctserver) {
1151 result = rc_acct_using_server(rstate.acctserver,
1152 rstate.client_port, send);
1153 } else {
1154 result = rc_acct(rstate.client_port, send);
1155 }
1156
1157 if (result != OK_RC) {
1158 /* RADIUS server could be down so make this a warning */
1159 syslog(LOG_WARNING,
1160 "Interim accounting failed for %s", rstate.user);
1161 }
1162 rc_avpair_free(send);
1163
1164 /* Schedule another one */
1165 TIMEOUT(radius_acct_interim, NULL, rstate.acct_interim_interval);
1166 }
1167
1168 /**********************************************************************
1169 * %FUNCTION: radius_ip_up
1170 * %ARGUMENTS:
1171 * opaque -- ignored
1172 * arg -- ignored
1173 * %RETURNS:
1174 * Nothing
1175 * %DESCRIPTION:
1176 * Called when IPCP is up. We'll do a start-accounting record.
1177 ***********************************************************************/
1178 static void
radius_ip_up(void * opaque,int arg)1179 radius_ip_up(void *opaque, int arg)
1180 {
1181 radius_acct_start();
1182 }
1183
1184 /**********************************************************************
1185 * %FUNCTION: radius_ip_down
1186 * %ARGUMENTS:
1187 * opaque -- ignored
1188 * arg -- ignored
1189 * %RETURNS:
1190 * Nothing
1191 * %DESCRIPTION:
1192 * Called when IPCP is down. We'll do a stop-accounting record.
1193 ***********************************************************************/
1194 static void
radius_ip_down(void * opaque,int arg)1195 radius_ip_down(void *opaque, int arg)
1196 {
1197 radius_acct_stop();
1198 }
1199
1200 /**********************************************************************
1201 * %FUNCTION: radius_init
1202 * %ARGUMENTS:
1203 * msg -- buffer of size BUF_LEN for error message
1204 * %RETURNS:
1205 * negative on failure; non-negative on success
1206 * %DESCRIPTION:
1207 * Initializes radiusclient library
1208 ***********************************************************************/
1209 static int
radius_init(char * msg)1210 radius_init(char *msg)
1211 {
1212 if (rstate.initialized) {
1213 return 0;
1214 }
1215
1216 if (config_file && *config_file) {
1217 strlcpy(rstate.config_file, config_file, MAXPATHLEN-1);
1218 }
1219
1220 rstate.initialized = 1;
1221
1222 if (rc_read_config(rstate.config_file) != 0) {
1223 slprintf(msg, BUF_LEN, "RADIUS: Can't read config file %s",
1224 rstate.config_file);
1225 return -1;
1226 }
1227
1228 if (rc_read_dictionary(rc_conf_str("dictionary")) != 0) {
1229 slprintf(msg, BUF_LEN, "RADIUS: Can't read dictionary file %s",
1230 rc_conf_str("dictionary"));
1231 return -1;
1232 }
1233
1234 if (rc_read_mapfile(rc_conf_str("mapfile")) != 0) {
1235 slprintf(msg, BUF_LEN, "RADIUS: Can't read map file %s",
1236 rc_conf_str("mapfile"));
1237 return -1;
1238 }
1239
1240 /* Add av pairs saved during option parsing */
1241 while (avpopt) {
1242 struct avpopt *n = avpopt->next;
1243
1244 rc_avpair_parse(avpopt->vpstr, &rstate.avp);
1245 free(avpopt->vpstr);
1246 free(avpopt);
1247 avpopt = n;
1248 }
1249 return 0;
1250 }
1251
1252 /**********************************************************************
1253 * %FUNCTION: get_client_port
1254 * %ARGUMENTS:
1255 * ifname -- PPP interface name (e.g. "ppp7")
1256 * %RETURNS:
1257 * The NAS port number (e.g. 7)
1258 * %DESCRIPTION:
1259 * Extracts the port number from the interface name
1260 ***********************************************************************/
1261 static int
get_client_port(char * ifname)1262 get_client_port(char *ifname)
1263 {
1264 int port;
1265 if (sscanf(ifname, "ppp%d", &port) == 1) {
1266 return port;
1267 }
1268 return rc_map2id(ifname);
1269 }
1270
1271 /**********************************************************************
1272 * %FUNCTION: radius_allowed_address
1273 * %ARGUMENTS:
1274 * addr -- IP address
1275 * %RETURNS:
1276 * 1 if we're allowed to use that IP address; 0 if not; -1 if we do
1277 * not know.
1278 ***********************************************************************/
1279 static int
radius_allowed_address(u_int32_t addr)1280 radius_allowed_address(u_int32_t addr)
1281 {
1282 ipcp_options *wo = &ipcp_wantoptions[0];
1283
1284 if (!rstate.choose_ip) {
1285 /* If RADIUS server said any address is OK, then fine... */
1286 if (rstate.any_ip_addr_ok) {
1287 return 1;
1288 }
1289
1290 /* Sigh... if an address was supplied for remote host in pppd
1291 options, it has to match that. */
1292 if (wo->hisaddr != 0 && wo->hisaddr == addr) {
1293 return 1;
1294 }
1295
1296 return 0;
1297 }
1298 if (addr == rstate.ip_addr) return 1;
1299 return 0;
1300 }
1301
1302 /* Useful for other plugins */
radius_logged_in_user(void)1303 char *radius_logged_in_user(void)
1304 {
1305 return rstate.user;
1306 }
1307