1 /*
2 * auth.c - PPP authentication and phase control.
3 *
4 * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. The name(s) of the authors of this software must not be used to
14 * endorse or promote products derived from this software without
15 * prior written permission.
16 *
17 * 3. Redistributions of any form whatsoever must retain the following
18 * acknowledgment:
19 * "This product includes software developed by Paul Mackerras
20 * <paulus@samba.org>".
21 *
22 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
29 *
30 * Derived from main.c, which is:
31 *
32 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
36 * are met:
37 *
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 *
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in
43 * the documentation and/or other materials provided with the
44 * distribution.
45 *
46 * 3. The name "Carnegie Mellon University" must not be used to
47 * endorse or promote products derived from this software without
48 * prior written permission. For permission or any legal
49 * details, please contact
50 * Office of Technology Transfer
51 * Carnegie Mellon University
52 * 5000 Forbes Avenue
53 * Pittsburgh, PA 15213-3890
54 * (412) 268-4387, fax: (412) 268-7395
55 * tech-transfer@andrew.cmu.edu
56 *
57 * 4. Redistributions of any form whatsoever must retain the following
58 * acknowledgment:
59 * "This product includes software developed by Computing Services
60 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
61 *
62 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
63 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
64 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
65 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
67 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
68 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
69 */
70
71 #include "netif/ppp/ppp_opts.h"
72 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
73
74 #if 0 /* UNUSED */
75 #include <stdio.h>
76 #include <stddef.h>
77 #include <stdlib.h>
78 #include <unistd.h>
79 #include <errno.h>
80 #include <pwd.h>
81 #include <grp.h>
82 #include <string.h>
83 #include <sys/types.h>
84 #include <sys/stat.h>
85 #include <sys/socket.h>
86 #include <utmp.h>
87 #include <fcntl.h>
88 #if defined(_PATH_LASTLOG) && defined(__linux__)
89 #include <lastlog.h>
90 #endif
91
92 #include <netdb.h>
93 #include <netinet/in.h>
94 #include <arpa/inet.h>
95
96 #ifdef HAS_SHADOW
97 #include <shadow.h>
98 #ifndef PW_PPP
99 #define PW_PPP PW_LOGIN
100 #endif
101 #endif
102
103 #include <time.h>
104 #endif /* UNUSED */
105
106 #include "netif/ppp/ppp_impl.h"
107
108 #include "netif/ppp/fsm.h"
109 #include "netif/ppp/lcp.h"
110 #if CCP_SUPPORT
111 #include "netif/ppp/ccp.h"
112 #endif /* CCP_SUPPORT */
113 #if ECP_SUPPORT
114 #include "netif/ppp/ecp.h"
115 #endif /* ECP_SUPPORT */
116 #include "netif/ppp/ipcp.h"
117 #if PAP_SUPPORT
118 #include "netif/ppp/upap.h"
119 #endif /* PAP_SUPPORT */
120 #if CHAP_SUPPORT
121 #include "netif/ppp/chap-new.h"
122 #endif /* CHAP_SUPPORT */
123 #if EAP_SUPPORT
124 #include "netif/ppp/eap.h"
125 #endif /* EAP_SUPPORT */
126 #if CBCP_SUPPORT
127 #include "netif/ppp/cbcp.h"
128 #endif
129
130 #if 0 /* UNUSED */
131 #include "session.h"
132 #endif /* UNUSED */
133
134 #if 0 /* UNUSED */
135 /* Bits in scan_authfile return value */
136 #define NONWILD_SERVER 1
137 #define NONWILD_CLIENT 2
138
139 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
140 #endif /* UNUSED */
141
142 #if 0 /* UNUSED */
143 /* List of addresses which the peer may use. */
144 static struct permitted_ip *addresses[NUM_PPP];
145
146 /* Wordlist giving addresses which the peer may use
147 without authenticating itself. */
148 static struct wordlist *noauth_addrs;
149
150 /* Remote telephone number, if available */
151 char remote_number[MAXNAMELEN];
152
153 /* Wordlist giving remote telephone numbers which may connect. */
154 static struct wordlist *permitted_numbers;
155
156 /* Extra options to apply, from the secrets file entry for the peer. */
157 static struct wordlist *extra_options;
158 #endif /* UNUSED */
159
160 #if 0 /* UNUSED */
161 /* Set if we require authentication only because we have a default route. */
162 static bool default_auth;
163
164 /* Hook to enable a plugin to control the idle time limit */
165 int (*idle_time_hook) (struct ppp_idle *) = NULL;
166
167 /* Hook for a plugin to say whether we can possibly authenticate any peer */
168 int (*pap_check_hook) (void) = NULL;
169
170 /* Hook for a plugin to check the PAP user and password */
171 int (*pap_auth_hook) (char *user, char *passwd, char **msgp,
172 struct wordlist **paddrs,
173 struct wordlist **popts) = NULL;
174
175 /* Hook for a plugin to know about the PAP user logout */
176 void (*pap_logout_hook) (void) = NULL;
177
178 /* Hook for a plugin to get the PAP password for authenticating us */
179 int (*pap_passwd_hook) (char *user, char *passwd) = NULL;
180
181 /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */
182 int (*chap_check_hook) (void) = NULL;
183
184 /* Hook for a plugin to get the CHAP password for authenticating us */
185 int (*chap_passwd_hook) (char *user, char *passwd) = NULL;
186
187 /* Hook for a plugin to say whether it is OK if the peer
188 refuses to authenticate. */
189 int (*null_auth_hook) (struct wordlist **paddrs,
190 struct wordlist **popts) = NULL;
191
192 int (*allowed_address_hook) (u32_t addr) = NULL;
193 #endif /* UNUSED */
194
195 #ifdef HAVE_MULTILINK
196 /* Hook for plugin to hear when an interface joins a multilink bundle */
197 void (*multilink_join_hook) (void) = NULL;
198 #endif
199
200 #if PPP_NOTIFY
201 /* A notifier for when the peer has authenticated itself,
202 and we are proceeding to the network phase. */
203 struct notifier *auth_up_notifier = NULL;
204
205 /* A notifier for when the link goes down. */
206 struct notifier *link_down_notifier = NULL;
207 #endif /* PPP_NOTIFY */
208
209 /*
210 * Option variables.
211 */
212 #if 0 /* MOVED TO ppp_settings */
213 bool uselogin = 0; /* Use /etc/passwd for checking PAP */
214 bool session_mgmt = 0; /* Do session management (login records) */
215 bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
216 bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
217 bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
218 bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */
219 #if MSCHAP_SUPPORT
220 bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */
221 bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */
222 #else /* MSCHAP_SUPPORT */
223 bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */
224 bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */
225 #endif /* MSCHAP_SUPPORT */
226 bool usehostname = 0; /* Use hostname for our_name */
227 bool auth_required = 0; /* Always require authentication from peer */
228 bool allow_any_ip = 0; /* Allow peer to use any IP address */
229 bool explicit_remote = 0; /* User specified explicit remote name */
230 bool explicit_user = 0; /* Set if "user" option supplied */
231 bool explicit_passwd = 0; /* Set if "password" option supplied */
232 char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
233 static char *uafname; /* name of most recent +ua file */
234
235 extern char *crypt (const char *, const char *);
236 #endif /* UNUSED */
237 /* Prototypes for procedures local to this file. */
238
239 static void network_phase(ppp_pcb *pcb);
240 #if PPP_IDLETIMELIMIT
241 static void check_idle(void *arg);
242 #endif /* PPP_IDLETIMELIMIT */
243 #if PPP_MAXCONNECT
244 static void connect_time_expired(void *arg);
245 #endif /* PPP_MAXCONNECT */
246 #if 0 /* UNUSED */
247 static int null_login (int);
248 /* static int get_pap_passwd (char *); */
249 static int have_pap_secret (int *);
250 static int have_chap_secret (char *, char *, int, int *);
251 static int have_srp_secret (char *client, char *server, int need_ip,
252 int *lacks_ipp);
253 static int ip_addr_check (u32_t, struct permitted_ip *);
254 static int scan_authfile (FILE *, char *, char *, char *,
255 struct wordlist **, struct wordlist **,
256 char *, int);
257 static void free_wordlist (struct wordlist *);
258 static void set_allowed_addrs (int, struct wordlist *, struct wordlist *);
259 static int some_ip_ok (struct wordlist *);
260 static int setupapfile (char **);
261 static int privgroup (char **);
262 static int set_noauth_addr (char **);
263 static int set_permitted_number (char **);
264 static void check_access (FILE *, char *);
265 static int wordlist_count (struct wordlist *);
266 #endif /* UNUSED */
267
268 #ifdef MAXOCTETS
269 static void check_maxoctets (void *);
270 #endif
271
272 #if PPP_OPTIONS
273 /*
274 * Authentication-related options.
275 */
276 option_t auth_options[] = {
277 { "auth", o_bool, &auth_required,
278 "Require authentication from peer", OPT_PRIO | 1 },
279 { "noauth", o_bool, &auth_required,
280 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
281 &allow_any_ip },
282 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
283 "Require PAP authentication from peer",
284 OPT_PRIOSUB | 1, &auth_required },
285 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
286 "Require PAP authentication from peer",
287 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
288 { "require-chap", o_bool, &auth_required,
289 "Require CHAP authentication from peer",
290 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
291 &lcp_wantoptions[0].chap_mdtype },
292 { "+chap", o_bool, &auth_required,
293 "Require CHAP authentication from peer",
294 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
295 &lcp_wantoptions[0].chap_mdtype },
296 #if MSCHAP_SUPPORT
297 { "require-mschap", o_bool, &auth_required,
298 "Require MS-CHAP authentication from peer",
299 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
300 &lcp_wantoptions[0].chap_mdtype },
301 { "+mschap", o_bool, &auth_required,
302 "Require MS-CHAP authentication from peer",
303 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
304 &lcp_wantoptions[0].chap_mdtype },
305 { "require-mschap-v2", o_bool, &auth_required,
306 "Require MS-CHAPv2 authentication from peer",
307 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
308 &lcp_wantoptions[0].chap_mdtype },
309 { "+mschap-v2", o_bool, &auth_required,
310 "Require MS-CHAPv2 authentication from peer",
311 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
312 &lcp_wantoptions[0].chap_mdtype },
313 #endif /* MSCHAP_SUPPORT */
314 #if 0
315 { "refuse-pap", o_bool, &refuse_pap,
316 "Don't agree to auth to peer with PAP", 1 },
317 { "-pap", o_bool, &refuse_pap,
318 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
319 { "refuse-chap", o_bool, &refuse_chap,
320 "Don't agree to auth to peer with CHAP",
321 OPT_A2CLRB | MDTYPE_MD5,
322 &lcp_allowoptions[0].chap_mdtype },
323 { "-chap", o_bool, &refuse_chap,
324 "Don't allow CHAP authentication with peer",
325 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
326 &lcp_allowoptions[0].chap_mdtype },
327 #endif
328 #if MSCHAP_SUPPORT
329 #if 0
330 { "refuse-mschap", o_bool, &refuse_mschap,
331 "Don't agree to auth to peer with MS-CHAP",
332 OPT_A2CLRB | MDTYPE_MICROSOFT,
333 &lcp_allowoptions[0].chap_mdtype },
334 { "-mschap", o_bool, &refuse_mschap,
335 "Don't allow MS-CHAP authentication with peer",
336 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
337 &lcp_allowoptions[0].chap_mdtype },
338 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
339 "Don't agree to auth to peer with MS-CHAPv2",
340 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
341 &lcp_allowoptions[0].chap_mdtype },
342 { "-mschap-v2", o_bool, &refuse_mschap_v2,
343 "Don't allow MS-CHAPv2 authentication with peer",
344 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
345 &lcp_allowoptions[0].chap_mdtype },
346 #endif
347 #endif /* MSCHAP_SUPPORT*/
348 #if EAP_SUPPORT
349 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
350 "Require EAP authentication from peer", OPT_PRIOSUB | 1,
351 &auth_required },
352 #if 0
353 { "refuse-eap", o_bool, &refuse_eap,
354 "Don't agree to authenticate to peer with EAP", 1 },
355 #endif
356 #endif /* EAP_SUPPORT */
357 { "name", o_string, our_name,
358 "Set local name for authentication",
359 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
360
361 { "+ua", o_special, (void *)setupapfile,
362 "Get PAP user and password from file",
363 OPT_PRIO | OPT_A2STRVAL, &uafname },
364
365 #if 0
366 { "user", o_string, user,
367 "Set name for auth with peer", OPT_PRIO | OPT_STATIC,
368 &explicit_user, MAXNAMELEN },
369
370 { "password", o_string, passwd,
371 "Password for authenticating us to the peer",
372 OPT_PRIO | OPT_STATIC | OPT_HIDE,
373 &explicit_passwd, MAXSECRETLEN },
374 #endif
375
376 { "usehostname", o_bool, &usehostname,
377 "Must use hostname for authentication", 1 },
378
379 { "remotename", o_string, remote_name,
380 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
381 &explicit_remote, MAXNAMELEN },
382
383 { "login", o_bool, &uselogin,
384 "Use system password database for PAP", OPT_A2COPY | 1 ,
385 &session_mgmt },
386 { "enable-session", o_bool, &session_mgmt,
387 "Enable session accounting for remote peers", OPT_PRIV | 1 },
388
389 { "papcrypt", o_bool, &cryptpap,
390 "PAP passwords are encrypted", 1 },
391
392 { "privgroup", o_special, (void *)privgroup,
393 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
394
395 { "allow-ip", o_special, (void *)set_noauth_addr,
396 "Set IP address(es) which can be used without authentication",
397 OPT_PRIV | OPT_A2LIST },
398
399 { "remotenumber", o_string, remote_number,
400 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
401 NULL, MAXNAMELEN },
402
403 { "allow-number", o_special, (void *)set_permitted_number,
404 "Set telephone number(s) which are allowed to connect",
405 OPT_PRIV | OPT_A2LIST },
406
407 { NULL }
408 };
409 #endif /* PPP_OPTIONS */
410
411 #if 0 /* UNUSED */
412 /*
413 * setupapfile - specifies UPAP info for authenticating with peer.
414 */
415 static int
416 setupapfile(argv)
417 char **argv;
418 {
419 FILE *ufile;
420 int l;
421 uid_t euid;
422 char u[MAXNAMELEN], p[MAXSECRETLEN];
423 char *fname;
424
425 lcp_allowoptions[0].neg_upap = 1;
426
427 /* open user info file */
428 fname = strdup(*argv);
429 if (fname == NULL)
430 novm("+ua file name");
431 euid = geteuid();
432 if (seteuid(getuid()) == -1) {
433 option_error("unable to reset uid before opening %s: %m", fname);
434 return 0;
435 }
436 ufile = fopen(fname, "r");
437 if (seteuid(euid) == -1)
438 fatal("unable to regain privileges: %m");
439 if (ufile == NULL) {
440 option_error("unable to open user login data file %s", fname);
441 return 0;
442 }
443 check_access(ufile, fname);
444 uafname = fname;
445
446 /* get username */
447 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
448 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
449 fclose(ufile);
450 option_error("unable to read user login data file %s", fname);
451 return 0;
452 }
453 fclose(ufile);
454
455 /* get rid of newlines */
456 l = strlen(u);
457 if (l > 0 && u[l-1] == '\n')
458 u[l-1] = 0;
459 l = strlen(p);
460 if (l > 0 && p[l-1] == '\n')
461 p[l-1] = 0;
462
463 if (override_value("user", option_priority, fname)) {
464 strlcpy(ppp_settings.user, u, sizeof(ppp_settings.user));
465 explicit_user = 1;
466 }
467 if (override_value("passwd", option_priority, fname)) {
468 strlcpy(ppp_settings.passwd, p, sizeof(ppp_settings.passwd));
469 explicit_passwd = 1;
470 }
471
472 return (1);
473 }
474
475 /*
476 * privgroup - allow members of the group to have privileged access.
477 */
478 static int
479 privgroup(argv)
480 char **argv;
481 {
482 struct group *g;
483 int i;
484
485 g = getgrnam(*argv);
486 if (g == 0) {
487 option_error("group %s is unknown", *argv);
488 return 0;
489 }
490 for (i = 0; i < ngroups; ++i) {
491 if (groups[i] == g->gr_gid) {
492 privileged = 1;
493 break;
494 }
495 }
496 return 1;
497 }
498
499
500 /*
501 * set_noauth_addr - set address(es) that can be used without authentication.
502 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
503 */
504 static int
505 set_noauth_addr(argv)
506 char **argv;
507 {
508 char *addr = *argv;
509 int l = strlen(addr) + 1;
510 struct wordlist *wp;
511
512 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
513 if (wp == NULL)
514 novm("allow-ip argument");
515 wp->word = (char *) (wp + 1);
516 wp->next = noauth_addrs;
517 MEMCPY(wp->word, addr, l);
518 noauth_addrs = wp;
519 return 1;
520 }
521
522
523 /*
524 * set_permitted_number - set remote telephone number(s) that may connect.
525 */
526 static int
527 set_permitted_number(argv)
528 char **argv;
529 {
530 char *number = *argv;
531 int l = strlen(number) + 1;
532 struct wordlist *wp;
533
534 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
535 if (wp == NULL)
536 novm("allow-number argument");
537 wp->word = (char *) (wp + 1);
538 wp->next = permitted_numbers;
539 MEMCPY(wp->word, number, l);
540 permitted_numbers = wp;
541 return 1;
542 }
543 #endif
544
545 /*
546 * An Open on LCP has requested a change from Dead to Establish phase.
547 */
link_required(ppp_pcb * pcb)548 void link_required(ppp_pcb *pcb) {
549 LWIP_UNUSED_ARG(pcb);
550 }
551
552 #if 0
553 /*
554 * Bring the link up to the point of being able to do ppp.
555 */
556 void start_link(unit)
557 int unit;
558 {
559 ppp_pcb *pcb = &ppp_pcb_list[unit];
560 char *msg;
561
562 status = EXIT_NEGOTIATION_FAILED;
563 new_phase(pcb, PPP_PHASE_SERIALCONN);
564
565 hungup = 0;
566 devfd = the_channel->connect();
567 msg = "Connect script failed";
568 if (devfd < 0)
569 goto fail;
570
571 /* set up the serial device as a ppp interface */
572 /*
573 * N.B. we used to do tdb_writelock/tdb_writeunlock around this
574 * (from establish_ppp to set_ifunit). However, we won't be
575 * doing the set_ifunit in multilink mode, which is the only time
576 * we need the atomicity that the tdb_writelock/tdb_writeunlock
577 * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock.
578 */
579 fd_ppp = the_channel->establish_ppp(devfd);
580 msg = "ppp establishment failed";
581 if (fd_ppp < 0) {
582 status = EXIT_FATAL_ERROR;
583 goto disconnect;
584 }
585
586 if (!demand && ifunit >= 0)
587 set_ifunit(1);
588
589 /*
590 * Start opening the connection and wait for
591 * incoming events (reply, timeout, etc.).
592 */
593 if (ifunit >= 0)
594 ppp_notice("Connect: %s <--> %s", ifname, ppp_devnam);
595 else
596 ppp_notice("Starting negotiation on %s", ppp_devnam);
597 add_fd(fd_ppp);
598
599 new_phase(pcb, PPP_PHASE_ESTABLISH);
600
601 lcp_lowerup(pcb);
602 return;
603
604 disconnect:
605 new_phase(pcb, PPP_PHASE_DISCONNECT);
606 if (the_channel->disconnect)
607 the_channel->disconnect();
608
609 fail:
610 new_phase(pcb, PPP_PHASE_DEAD);
611 if (the_channel->cleanup)
612 (*the_channel->cleanup)();
613 }
614 #endif
615
616 /*
617 * LCP has terminated the link; go to the Dead phase and take the
618 * physical layer down.
619 */
link_terminated(ppp_pcb * pcb)620 void link_terminated(ppp_pcb *pcb) {
621 if (pcb->phase == PPP_PHASE_DEAD
622 #ifdef HAVE_MULTILINK
623 || pcb->phase == PPP_PHASE_MASTER
624 #endif /* HAVE_MULTILINK */
625 )
626 return;
627 new_phase(pcb, PPP_PHASE_DISCONNECT);
628
629 #if 0 /* UNUSED */
630 if (pap_logout_hook) {
631 pap_logout_hook();
632 }
633 session_end(devnam);
634 #endif /* UNUSED */
635
636 if (!doing_multilink) {
637 ppp_notice("Connection terminated.");
638 #if PPP_STATS_SUPPORT
639 print_link_stats();
640 #endif /* PPP_STATS_SUPPORT */
641 } else
642 ppp_notice("Link terminated.");
643
644 lcp_lowerdown(pcb);
645
646 ppp_link_terminated(pcb);
647 #if 0
648 /*
649 * Delete pid files before disestablishing ppp. Otherwise it
650 * can happen that another pppd gets the same unit and then
651 * we delete its pid file.
652 */
653 if (!doing_multilink && !demand)
654 remove_pidfiles();
655
656 /*
657 * If we may want to bring the link up again, transfer
658 * the ppp unit back to the loopback. Set the
659 * real serial device back to its normal mode of operation.
660 */
661 if (fd_ppp >= 0) {
662 remove_fd(fd_ppp);
663 clean_check();
664 the_channel->disestablish_ppp(devfd);
665 if (doing_multilink)
666 mp_exit_bundle();
667 fd_ppp = -1;
668 }
669 if (!hungup)
670 lcp_lowerdown(pcb);
671 if (!doing_multilink && !demand)
672 script_unsetenv("IFNAME");
673
674 /*
675 * Run disconnector script, if requested.
676 * XXX we may not be able to do this if the line has hung up!
677 */
678 if (devfd >= 0 && the_channel->disconnect) {
679 the_channel->disconnect();
680 devfd = -1;
681 }
682 if (the_channel->cleanup)
683 (*the_channel->cleanup)();
684
685 if (doing_multilink && multilink_master) {
686 if (!bundle_terminating)
687 new_phase(pcb, PPP_PHASE_MASTER);
688 else
689 mp_bundle_terminated();
690 } else
691 new_phase(pcb, PPP_PHASE_DEAD);
692 #endif
693 }
694
695 /*
696 * LCP has gone down; it will either die or try to re-establish.
697 */
link_down(ppp_pcb * pcb)698 void link_down(ppp_pcb *pcb) {
699 #if PPP_NOTIFY
700 notify(link_down_notifier, 0);
701 #endif /* PPP_NOTIFY */
702
703 if (!doing_multilink) {
704 upper_layers_down(pcb);
705 if (pcb->phase != PPP_PHASE_DEAD
706 #ifdef HAVE_MULTILINK
707 && pcb->phase != PPP_PHASE_MASTER
708 #endif /* HAVE_MULTILINK */
709 )
710 new_phase(pcb, PPP_PHASE_ESTABLISH);
711 }
712 /* XXX if doing_multilink, should do something to stop
713 network-layer traffic on the link */
714 }
715
upper_layers_down(ppp_pcb * pcb)716 void upper_layers_down(ppp_pcb *pcb) {
717 int i;
718 const struct protent *protp;
719
720 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
721 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
722 (*protp->lowerdown)(pcb);
723 if (protp->protocol < 0xC000 && protp->close != NULL)
724 (*protp->close)(pcb, "LCP down");
725 }
726 pcb->num_np_open = 0;
727 pcb->num_np_up = 0;
728 }
729
730 /*
731 * The link is established.
732 * Proceed to the Dead, Authenticate or Network phase as appropriate.
733 */
link_established(ppp_pcb * pcb)734 void link_established(ppp_pcb *pcb) {
735 #if PPP_AUTH_SUPPORT
736 int auth;
737 #if PPP_SERVER
738 #if PAP_SUPPORT
739 lcp_options *wo = &pcb->lcp_wantoptions;
740 #endif /* PAP_SUPPORT */
741 lcp_options *go = &pcb->lcp_gotoptions;
742 #endif /* PPP_SERVER */
743 lcp_options *ho = &pcb->lcp_hisoptions;
744 #endif /* PPP_AUTH_SUPPORT */
745 int i;
746 const struct protent *protp;
747
748 /*
749 * Tell higher-level protocols that LCP is up.
750 */
751 if (!doing_multilink) {
752 for (i = 0; (protp = protocols[i]) != NULL; ++i)
753 if (protp->protocol != PPP_LCP
754 && protp->lowerup != NULL)
755 (*protp->lowerup)(pcb);
756 }
757
758 #if PPP_AUTH_SUPPORT
759 #if PPP_SERVER
760 #if PPP_ALLOWED_ADDRS
761 if (!auth_required && noauth_addrs != NULL)
762 set_allowed_addrs(unit, NULL, NULL);
763 #endif /* PPP_ALLOWED_ADDRS */
764
765 if (pcb->settings.auth_required && !(0
766 #if PAP_SUPPORT
767 || go->neg_upap
768 #endif /* PAP_SUPPORT */
769 #if CHAP_SUPPORT
770 || go->neg_chap
771 #endif /* CHAP_SUPPORT */
772 #if EAP_SUPPORT
773 || go->neg_eap
774 #endif /* EAP_SUPPORT */
775 )) {
776
777 #if PPP_ALLOWED_ADDRS
778 /*
779 * We wanted the peer to authenticate itself, and it refused:
780 * if we have some address(es) it can use without auth, fine,
781 * otherwise treat it as though it authenticated with PAP using
782 * a username of "" and a password of "". If that's not OK,
783 * boot it out.
784 */
785 if (noauth_addrs != NULL) {
786 set_allowed_addrs(unit, NULL, NULL);
787 } else
788 #endif /* PPP_ALLOWED_ADDRS */
789 if (!pcb->settings.null_login
790 #if PAP_SUPPORT
791 || !wo->neg_upap
792 #endif /* PAP_SUPPORT */
793 ) {
794 ppp_warn("peer refused to authenticate: terminating link");
795 #if 0 /* UNUSED */
796 status = EXIT_PEER_AUTH_FAILED;
797 #endif /* UNUSED */
798 pcb->err_code = PPPERR_AUTHFAIL;
799 lcp_close(pcb, "peer refused to authenticate");
800 return;
801 }
802 }
803 #endif /* PPP_SERVER */
804
805 new_phase(pcb, PPP_PHASE_AUTHENTICATE);
806 auth = 0;
807 #if PPP_SERVER
808 #if EAP_SUPPORT
809 if (go->neg_eap) {
810 eap_authpeer(pcb, PPP_OUR_NAME);
811 auth |= EAP_PEER;
812 } else
813 #endif /* EAP_SUPPORT */
814 #if CHAP_SUPPORT
815 if (go->neg_chap) {
816 chap_auth_peer(pcb, PPP_OUR_NAME, CHAP_DIGEST(go->chap_mdtype));
817 auth |= CHAP_PEER;
818 } else
819 #endif /* CHAP_SUPPORT */
820 #if PAP_SUPPORT
821 if (go->neg_upap) {
822 upap_authpeer(pcb);
823 auth |= PAP_PEER;
824 } else
825 #endif /* PAP_SUPPORT */
826 {}
827 #endif /* PPP_SERVER */
828
829 #if EAP_SUPPORT
830 if (ho->neg_eap) {
831 eap_authwithpeer(pcb, pcb->settings.user);
832 auth |= EAP_WITHPEER;
833 } else
834 #endif /* EAP_SUPPORT */
835 #if CHAP_SUPPORT
836 if (ho->neg_chap) {
837 chap_auth_with_peer(pcb, pcb->settings.user, CHAP_DIGEST(ho->chap_mdtype));
838 auth |= CHAP_WITHPEER;
839 } else
840 #endif /* CHAP_SUPPORT */
841 #if PAP_SUPPORT
842 if (ho->neg_upap) {
843 upap_authwithpeer(pcb, pcb->settings.user, pcb->settings.passwd);
844 auth |= PAP_WITHPEER;
845 } else
846 #endif /* PAP_SUPPORT */
847 {}
848
849 pcb->auth_pending = auth;
850 pcb->auth_done = 0;
851
852 if (!auth)
853 #endif /* PPP_AUTH_SUPPORT */
854 network_phase(pcb);
855 }
856
857 /*
858 * Proceed to the network phase.
859 */
network_phase(ppp_pcb * pcb)860 static void network_phase(ppp_pcb *pcb) {
861 #if CBCP_SUPPORT
862 ppp_pcb *pcb = &ppp_pcb_list[unit];
863 #endif
864 #if 0 /* UNUSED */
865 lcp_options *go = &lcp_gotoptions[unit];
866 #endif /* UNUSED */
867
868 #if 0 /* UNUSED */
869 /* Log calling number. */
870 if (*remote_number)
871 ppp_notice("peer from calling number %q authorized", remote_number);
872 #endif /* UNUSED */
873
874 #if PPP_NOTIFY
875 /*
876 * If the peer had to authenticate, notify it now.
877 */
878 if (0
879 #if CHAP_SUPPORT
880 || go->neg_chap
881 #endif /* CHAP_SUPPORT */
882 #if PAP_SUPPORT
883 || go->neg_upap
884 #endif /* PAP_SUPPORT */
885 #if EAP_SUPPORT
886 || go->neg_eap
887 #endif /* EAP_SUPPORT */
888 ) {
889 notify(auth_up_notifier, 0);
890 }
891 #endif /* PPP_NOTIFY */
892
893 #if CBCP_SUPPORT
894 /*
895 * If we negotiated callback, do it now.
896 */
897 if (go->neg_cbcp) {
898 new_phase(pcb, PPP_PHASE_CALLBACK);
899 (*cbcp_protent.open)(pcb);
900 return;
901 }
902 #endif
903
904 #if PPP_OPTIONS
905 /*
906 * Process extra options from the secrets file
907 */
908 if (extra_options) {
909 options_from_list(extra_options, 1);
910 free_wordlist(extra_options);
911 extra_options = 0;
912 }
913 #endif /* PPP_OPTIONS */
914 start_networks(pcb);
915 }
916
start_networks(ppp_pcb * pcb)917 void start_networks(ppp_pcb *pcb) {
918 #if CCP_SUPPORT || ECP_SUPPORT
919 int i;
920 const struct protent *protp;
921 #endif /* CCP_SUPPORT || ECP_SUPPORT */
922
923 new_phase(pcb, PPP_PHASE_NETWORK);
924
925 #ifdef HAVE_MULTILINK
926 if (multilink) {
927 if (mp_join_bundle()) {
928 if (multilink_join_hook)
929 (*multilink_join_hook)();
930 if (updetach && !nodetach)
931 detach();
932 return;
933 }
934 }
935 #endif /* HAVE_MULTILINK */
936
937 #ifdef PPP_FILTER
938 if (!demand)
939 set_filters(&pass_filter, &active_filter);
940 #endif
941 #if CCP_SUPPORT || ECP_SUPPORT
942 /* Start CCP and ECP */
943 for (i = 0; (protp = protocols[i]) != NULL; ++i)
944 if (
945 (0
946 #if ECP_SUPPORT
947 || protp->protocol == PPP_ECP
948 #endif /* ECP_SUPPORT */
949 #if CCP_SUPPORT
950 || protp->protocol == PPP_CCP
951 #endif /* CCP_SUPPORT */
952 )
953 && protp->open != NULL)
954 (*protp->open)(pcb);
955 #endif /* CCP_SUPPORT || ECP_SUPPORT */
956
957 /*
958 * Bring up other network protocols iff encryption is not required.
959 */
960 if (1
961 #if ECP_SUPPORT
962 && !ecp_gotoptions[unit].required
963 #endif /* ECP_SUPPORT */
964 #if MPPE_SUPPORT
965 && !pcb->ccp_gotoptions.mppe
966 #endif /* MPPE_SUPPORT */
967 )
968 continue_networks(pcb);
969 }
970
continue_networks(ppp_pcb * pcb)971 void continue_networks(ppp_pcb *pcb) {
972 int i;
973 const struct protent *protp;
974
975 /*
976 * Start the "real" network protocols.
977 */
978 for (i = 0; (protp = protocols[i]) != NULL; ++i)
979 if (protp->protocol < 0xC000
980 #if CCP_SUPPORT
981 && protp->protocol != PPP_CCP
982 #endif /* CCP_SUPPORT */
983 #if ECP_SUPPORT
984 && protp->protocol != PPP_ECP
985 #endif /* ECP_SUPPORT */
986 && protp->open != NULL) {
987 (*protp->open)(pcb);
988 ++pcb->num_np_open;
989 }
990
991 if (pcb->num_np_open == 0)
992 /* nothing to do */
993 lcp_close(pcb, "No network protocols running");
994 }
995
996 #if PPP_AUTH_SUPPORT
997 #if PPP_SERVER
998 /*
999 * auth_check_passwd - Check the user name and passwd against configuration.
1000 *
1001 * returns:
1002 * 0: Authentication failed.
1003 * 1: Authentication succeeded.
1004 * In either case, msg points to an appropriate message and msglen to the message len.
1005 */
auth_check_passwd(ppp_pcb * pcb,char * auser,int userlen,char * apasswd,int passwdlen,const char ** msg,int * msglen)1006 int auth_check_passwd(ppp_pcb *pcb, char *auser, int userlen, char *apasswd, int passwdlen, const char **msg, int *msglen) {
1007 int secretuserlen;
1008 int secretpasswdlen;
1009
1010 if (pcb->settings.user && pcb->settings.passwd) {
1011 secretuserlen = (int)strlen(pcb->settings.user);
1012 secretpasswdlen = (int)strlen(pcb->settings.passwd);
1013 if (secretuserlen == userlen
1014 && secretpasswdlen == passwdlen
1015 && !memcmp(auser, pcb->settings.user, userlen)
1016 && !memcmp(apasswd, pcb->settings.passwd, passwdlen) ) {
1017 *msg = "Login ok";
1018 *msglen = sizeof("Login ok")-1;
1019 return 1;
1020 }
1021 }
1022
1023 *msg = "Login incorrect";
1024 *msglen = sizeof("Login incorrect")-1;
1025 return 0;
1026 }
1027
1028 /*
1029 * The peer has failed to authenticate himself using `protocol'.
1030 */
auth_peer_fail(ppp_pcb * pcb,int protocol)1031 void auth_peer_fail(ppp_pcb *pcb, int protocol) {
1032 LWIP_UNUSED_ARG(protocol);
1033 /*
1034 * Authentication failure: take the link down
1035 */
1036 #if 0 /* UNUSED */
1037 status = EXIT_PEER_AUTH_FAILED;
1038 #endif /* UNUSED */
1039 pcb->err_code = PPPERR_AUTHFAIL;
1040 lcp_close(pcb, "Authentication failed");
1041 }
1042
1043 /*
1044 * The peer has been successfully authenticated using `protocol'.
1045 */
auth_peer_success(ppp_pcb * pcb,int protocol,int prot_flavor,const char * name,int namelen)1046 void auth_peer_success(ppp_pcb *pcb, int protocol, int prot_flavor, const char *name, int namelen) {
1047 int bit;
1048 #ifndef HAVE_MULTILINK
1049 LWIP_UNUSED_ARG(name);
1050 LWIP_UNUSED_ARG(namelen);
1051 #endif /* HAVE_MULTILINK */
1052
1053 switch (protocol) {
1054 #if CHAP_SUPPORT
1055 case PPP_CHAP:
1056 bit = CHAP_PEER;
1057 switch (prot_flavor) {
1058 case CHAP_MD5:
1059 bit |= CHAP_MD5_PEER;
1060 break;
1061 #if MSCHAP_SUPPORT
1062 case CHAP_MICROSOFT:
1063 bit |= CHAP_MS_PEER;
1064 break;
1065 case CHAP_MICROSOFT_V2:
1066 bit |= CHAP_MS2_PEER;
1067 break;
1068 #endif /* MSCHAP_SUPPORT */
1069 default:
1070 break;
1071 }
1072 break;
1073 #endif /* CHAP_SUPPORT */
1074 #if PAP_SUPPORT
1075 case PPP_PAP:
1076 bit = PAP_PEER;
1077 break;
1078 #endif /* PAP_SUPPORT */
1079 #if EAP_SUPPORT
1080 case PPP_EAP:
1081 bit = EAP_PEER;
1082 break;
1083 #endif /* EAP_SUPPORT */
1084 default:
1085 ppp_warn("auth_peer_success: unknown protocol %x", protocol);
1086 return;
1087 }
1088
1089 #ifdef HAVE_MULTILINK
1090 /*
1091 * Save the authenticated name of the peer for later.
1092 */
1093 if (namelen > (int)sizeof(pcb->peer_authname) - 1)
1094 namelen = (int)sizeof(pcb->peer_authname) - 1;
1095 MEMCPY(pcb->peer_authname, name, namelen);
1096 pcb->peer_authname[namelen] = 0;
1097 #endif /* HAVE_MULTILINK */
1098 #if 0 /* UNUSED */
1099 script_setenv("PEERNAME", , 0);
1100 #endif /* UNUSED */
1101
1102 /* Save the authentication method for later. */
1103 pcb->auth_done |= bit;
1104
1105 /*
1106 * If there is no more authentication still to be done,
1107 * proceed to the network (or callback) phase.
1108 */
1109 if ((pcb->auth_pending &= ~bit) == 0)
1110 network_phase(pcb);
1111 }
1112 #endif /* PPP_SERVER */
1113
1114 /*
1115 * We have failed to authenticate ourselves to the peer using `protocol'.
1116 */
auth_withpeer_fail(ppp_pcb * pcb,int protocol)1117 void auth_withpeer_fail(ppp_pcb *pcb, int protocol) {
1118 LWIP_UNUSED_ARG(protocol);
1119 /*
1120 * We've failed to authenticate ourselves to our peer.
1121 *
1122 * Some servers keep sending CHAP challenges, but there
1123 * is no point in persisting without any way to get updated
1124 * authentication secrets.
1125 *
1126 * He'll probably take the link down, and there's not much
1127 * we can do except wait for that.
1128 */
1129 pcb->err_code = PPPERR_AUTHFAIL;
1130 lcp_close(pcb, "Failed to authenticate ourselves to peer");
1131 }
1132
1133 /*
1134 * We have successfully authenticated ourselves with the peer using `protocol'.
1135 */
auth_withpeer_success(ppp_pcb * pcb,int protocol,int prot_flavor)1136 void auth_withpeer_success(ppp_pcb *pcb, int protocol, int prot_flavor) {
1137 int bit;
1138 const char *prot = "";
1139
1140 switch (protocol) {
1141 #if CHAP_SUPPORT
1142 case PPP_CHAP:
1143 bit = CHAP_WITHPEER;
1144 prot = "CHAP";
1145 switch (prot_flavor) {
1146 case CHAP_MD5:
1147 bit |= CHAP_MD5_WITHPEER;
1148 break;
1149 #if MSCHAP_SUPPORT
1150 case CHAP_MICROSOFT:
1151 bit |= CHAP_MS_WITHPEER;
1152 break;
1153 case CHAP_MICROSOFT_V2:
1154 bit |= CHAP_MS2_WITHPEER;
1155 break;
1156 #endif /* MSCHAP_SUPPORT */
1157 default:
1158 break;
1159 }
1160 break;
1161 #endif /* CHAP_SUPPORT */
1162 #if PAP_SUPPORT
1163 case PPP_PAP:
1164 bit = PAP_WITHPEER;
1165 prot = "PAP";
1166 break;
1167 #endif /* PAP_SUPPORT */
1168 #if EAP_SUPPORT
1169 case PPP_EAP:
1170 bit = EAP_WITHPEER;
1171 prot = "EAP";
1172 break;
1173 #endif /* EAP_SUPPORT */
1174 default:
1175 ppp_warn("auth_withpeer_success: unknown protocol %x", protocol);
1176 bit = 0;
1177 /* no break */
1178 }
1179
1180 ppp_notice("%s authentication succeeded", prot);
1181
1182 /* Save the authentication method for later. */
1183 pcb->auth_done |= bit;
1184
1185 /*
1186 * If there is no more authentication still being done,
1187 * proceed to the network (or callback) phase.
1188 */
1189 if ((pcb->auth_pending &= ~bit) == 0)
1190 network_phase(pcb);
1191 }
1192 #endif /* PPP_AUTH_SUPPORT */
1193
1194
1195 /*
1196 * np_up - a network protocol has come up.
1197 */
np_up(ppp_pcb * pcb,int proto)1198 void np_up(ppp_pcb *pcb, int proto) {
1199 #if PPP_IDLETIMELIMIT
1200 int tlim;
1201 #endif /* PPP_IDLETIMELIMIT */
1202 LWIP_UNUSED_ARG(proto);
1203
1204 if (pcb->num_np_up == 0) {
1205 /*
1206 * At this point we consider that the link has come up successfully.
1207 */
1208 new_phase(pcb, PPP_PHASE_RUNNING);
1209
1210 #if PPP_IDLETIMELIMIT
1211 #if 0 /* UNUSED */
1212 if (idle_time_hook != 0)
1213 tlim = (*idle_time_hook)(NULL);
1214 else
1215 #endif /* UNUSED */
1216 tlim = pcb->settings.idle_time_limit;
1217 if (tlim > 0)
1218 TIMEOUT(check_idle, (void*)pcb, tlim);
1219 #endif /* PPP_IDLETIMELIMIT */
1220
1221 #if PPP_MAXCONNECT
1222 /*
1223 * Set a timeout to close the connection once the maximum
1224 * connect time has expired.
1225 */
1226 if (pcb->settings.maxconnect > 0)
1227 TIMEOUT(connect_time_expired, (void*)pcb, pcb->settings.maxconnect);
1228 #endif /* PPP_MAXCONNECT */
1229
1230 #ifdef MAXOCTETS
1231 if (maxoctets > 0)
1232 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1233 #endif
1234
1235 #if 0 /* Unused */
1236 /*
1237 * Detach now, if the updetach option was given.
1238 */
1239 if (updetach && !nodetach)
1240 detach();
1241 #endif /* Unused */
1242 }
1243 ++pcb->num_np_up;
1244 }
1245
1246 /*
1247 * np_down - a network protocol has gone down.
1248 */
np_down(ppp_pcb * pcb,int proto)1249 void np_down(ppp_pcb *pcb, int proto) {
1250 LWIP_UNUSED_ARG(proto);
1251 if (--pcb->num_np_up == 0) {
1252 #if PPP_IDLETIMELIMIT
1253 UNTIMEOUT(check_idle, (void*)pcb);
1254 #endif /* PPP_IDLETIMELIMIT */
1255 #if PPP_MAXCONNECT
1256 UNTIMEOUT(connect_time_expired, NULL);
1257 #endif /* PPP_MAXCONNECT */
1258 #ifdef MAXOCTETS
1259 UNTIMEOUT(check_maxoctets, NULL);
1260 #endif
1261 new_phase(pcb, PPP_PHASE_NETWORK);
1262 }
1263 }
1264
1265 /*
1266 * np_finished - a network protocol has finished using the link.
1267 */
np_finished(ppp_pcb * pcb,int proto)1268 void np_finished(ppp_pcb *pcb, int proto) {
1269 LWIP_UNUSED_ARG(proto);
1270 if (--pcb->num_np_open <= 0) {
1271 /* no further use for the link: shut up shop. */
1272 lcp_close(pcb, "No network protocols running");
1273 }
1274 }
1275
1276 #ifdef MAXOCTETS
1277 static void
check_maxoctets(arg)1278 check_maxoctets(arg)
1279 void *arg;
1280 {
1281 #if PPP_STATS_SUPPORT
1282 unsigned int used;
1283
1284 update_link_stats(ifunit);
1285 link_stats_valid=0;
1286
1287 switch(maxoctets_dir) {
1288 case PPP_OCTETS_DIRECTION_IN:
1289 used = link_stats.bytes_in;
1290 break;
1291 case PPP_OCTETS_DIRECTION_OUT:
1292 used = link_stats.bytes_out;
1293 break;
1294 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1295 case PPP_OCTETS_DIRECTION_MAXSESSION:
1296 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1297 break;
1298 default:
1299 used = link_stats.bytes_in+link_stats.bytes_out;
1300 break;
1301 }
1302 if (used > maxoctets) {
1303 ppp_notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1304 status = EXIT_TRAFFIC_LIMIT;
1305 lcp_close(pcb, "Traffic limit");
1306 #if 0 /* UNUSED */
1307 need_holdoff = 0;
1308 #endif /* UNUSED */
1309 } else {
1310 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1311 }
1312 #endif /* PPP_STATS_SUPPORT */
1313 }
1314 #endif /* MAXOCTETS */
1315
1316 #if PPP_IDLETIMELIMIT
1317 /*
1318 * check_idle - check whether the link has been idle for long
1319 * enough that we can shut it down.
1320 */
check_idle(void * arg)1321 static void check_idle(void *arg) {
1322 ppp_pcb *pcb = (ppp_pcb*)arg;
1323 struct ppp_idle idle;
1324 time_t itime;
1325 int tlim;
1326
1327 if (!get_idle_time(pcb, &idle))
1328 return;
1329 #if 0 /* UNUSED */
1330 if (idle_time_hook != 0) {
1331 tlim = idle_time_hook(&idle);
1332 } else {
1333 #endif /* UNUSED */
1334 itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle);
1335 tlim = pcb->settings.idle_time_limit - itime;
1336 #if 0 /* UNUSED */
1337 }
1338 #endif /* UNUSED */
1339 if (tlim <= 0) {
1340 /* link is idle: shut it down. */
1341 ppp_notice("Terminating connection due to lack of activity.");
1342 pcb->err_code = PPPERR_IDLETIMEOUT;
1343 lcp_close(pcb, "Link inactive");
1344 #if 0 /* UNUSED */
1345 need_holdoff = 0;
1346 #endif /* UNUSED */
1347 } else {
1348 TIMEOUT(check_idle, (void*)pcb, tlim);
1349 }
1350 }
1351 #endif /* PPP_IDLETIMELIMIT */
1352
1353 #if PPP_MAXCONNECT
1354 /*
1355 * connect_time_expired - log a message and close the connection.
1356 */
connect_time_expired(void * arg)1357 static void connect_time_expired(void *arg) {
1358 ppp_pcb *pcb = (ppp_pcb*)arg;
1359 ppp_info("Connect time expired");
1360 pcb->err_code = PPPERR_CONNECTTIME;
1361 lcp_close(pcb, "Connect time expired"); /* Close connection */
1362 }
1363 #endif /* PPP_MAXCONNECT */
1364
1365 #if PPP_OPTIONS
1366 /*
1367 * auth_check_options - called to check authentication options.
1368 */
1369 void
auth_check_options()1370 auth_check_options()
1371 {
1372 lcp_options *wo = &lcp_wantoptions[0];
1373 int can_auth;
1374 int lacks_ip;
1375
1376 /* Default our_name to hostname, and user to our_name */
1377 if (our_name[0] == 0 || usehostname)
1378 strlcpy(our_name, hostname, sizeof(our_name));
1379 /* If a blank username was explicitly given as an option, trust
1380 the user and don't use our_name */
1381 if (ppp_settings.user[0] == 0 && !explicit_user)
1382 strlcpy(ppp_settings.user, our_name, sizeof(ppp_settings.user));
1383
1384 /*
1385 * If we have a default route, require the peer to authenticate
1386 * unless the noauth option was given or the real user is root.
1387 */
1388 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1389 auth_required = 1;
1390 default_auth = 1;
1391 }
1392
1393 #if CHAP_SUPPORT
1394 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1395 if (wo->chap_mdtype)
1396 wo->neg_chap = 1;
1397 #endif /* CHAP_SUPPORT */
1398
1399 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1400 if (auth_required) {
1401 allow_any_ip = 0;
1402 if (1
1403 #if CHAP_SUPPORT
1404 && !wo->neg_chap
1405 #endif /* CHAP_SUPPORT */
1406 #if PAP_SUPPORT
1407 && !wo->neg_upap
1408 #endif /* PAP_SUPPORT */
1409 #if EAP_SUPPORT
1410 && !wo->neg_eap
1411 #endif /* EAP_SUPPORT */
1412 ) {
1413 #if CHAP_SUPPORT
1414 wo->neg_chap = CHAP_MDTYPE_SUPPORTED != MDTYPE_NONE;
1415 wo->chap_mdtype = CHAP_MDTYPE_SUPPORTED;
1416 #endif /* CHAP_SUPPORT */
1417 #if PAP_SUPPORT
1418 wo->neg_upap = 1;
1419 #endif /* PAP_SUPPORT */
1420 #if EAP_SUPPORT
1421 wo->neg_eap = 1;
1422 #endif /* EAP_SUPPORT */
1423 }
1424 } else {
1425 #if CHAP_SUPPORT
1426 wo->neg_chap = 0;
1427 wo->chap_mdtype = MDTYPE_NONE;
1428 #endif /* CHAP_SUPPORT */
1429 #if PAP_SUPPORT
1430 wo->neg_upap = 0;
1431 #endif /* PAP_SUPPORT */
1432 #if EAP_SUPPORT
1433 wo->neg_eap = 0;
1434 #endif /* EAP_SUPPORT */
1435 }
1436
1437 /*
1438 * Check whether we have appropriate secrets to use
1439 * to authenticate the peer. Note that EAP can authenticate by way
1440 * of a CHAP-like exchanges as well as SRP.
1441 */
1442 lacks_ip = 0;
1443 #if PAP_SUPPORT
1444 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1445 #else
1446 can_auth = 0;
1447 #endif /* PAP_SUPPORT */
1448 if (!can_auth && (0
1449 #if CHAP_SUPPORT
1450 || wo->neg_chap
1451 #endif /* CHAP_SUPPORT */
1452 #if EAP_SUPPORT
1453 || wo->neg_eap
1454 #endif /* EAP_SUPPORT */
1455 )) {
1456 #if CHAP_SUPPORT
1457 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1458 our_name, 1, &lacks_ip);
1459 #else
1460 can_auth = 0;
1461 #endif
1462 }
1463 if (!can_auth
1464 #if EAP_SUPPORT
1465 && wo->neg_eap
1466 #endif /* EAP_SUPPORT */
1467 ) {
1468 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1469 our_name, 1, &lacks_ip);
1470 }
1471
1472 if (auth_required && !can_auth && noauth_addrs == NULL) {
1473 if (default_auth) {
1474 option_error(
1475 "By default the remote system is required to authenticate itself");
1476 option_error(
1477 "(because this system has a default route to the internet)");
1478 } else if (explicit_remote)
1479 option_error(
1480 "The remote system (%s) is required to authenticate itself",
1481 remote_name);
1482 else
1483 option_error(
1484 "The remote system is required to authenticate itself");
1485 option_error(
1486 "but I couldn't find any suitable secret (password) for it to use to do so.");
1487 if (lacks_ip)
1488 option_error(
1489 "(None of the available passwords would let it use an IP address.)");
1490
1491 exit(1);
1492 }
1493
1494 /*
1495 * Early check for remote number authorization.
1496 */
1497 if (!auth_number()) {
1498 ppp_warn("calling number %q is not authorized", remote_number);
1499 exit(EXIT_CNID_AUTH_FAILED);
1500 }
1501 }
1502 #endif /* PPP_OPTIONS */
1503
1504 #if 0 /* UNUSED */
1505 /*
1506 * auth_reset - called when LCP is starting negotiations to recheck
1507 * authentication options, i.e. whether we have appropriate secrets
1508 * to use for authenticating ourselves and/or the peer.
1509 */
1510 void
1511 auth_reset(unit)
1512 int unit;
1513 {
1514 lcp_options *go = &lcp_gotoptions[unit];
1515 lcp_options *ao = &lcp_allowoptions[unit];
1516 int hadchap;
1517
1518 hadchap = -1;
1519 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1520 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1521 && (passwd[0] != 0 ||
1522 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1523 NULL), 0, NULL)));
1524 ao->neg_eap = !refuse_eap && (
1525 passwd[0] != 0 ||
1526 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1527 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1528 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL));
1529
1530 hadchap = -1;
1531 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1532 go->neg_upap = 0;
1533 if (go->neg_chap) {
1534 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1535 our_name, 1, NULL)))
1536 go->neg_chap = 0;
1537 }
1538 if (go->neg_eap &&
1539 (hadchap == 0 || (hadchap == -1 &&
1540 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1541 1, NULL))) &&
1542 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1543 NULL))
1544 go->neg_eap = 0;
1545 }
1546
1547 /*
1548 * check_passwd - Check the user name and passwd against the PAP secrets
1549 * file. If requested, also check against the system password database,
1550 * and login the user if OK.
1551 *
1552 * returns:
1553 * UPAP_AUTHNAK: Authentication failed.
1554 * UPAP_AUTHACK: Authentication succeeded.
1555 * In either case, msg points to an appropriate message.
1556 */
1557 int
1558 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
1559 int unit;
1560 char *auser;
1561 int userlen;
1562 char *apasswd;
1563 int passwdlen;
1564 char **msg;
1565 {
1566 return UPAP_AUTHNAK;
1567 int ret;
1568 char *filename;
1569 FILE *f;
1570 struct wordlist *addrs = NULL, *opts = NULL;
1571 char passwd[256], user[256];
1572 char secret[MAXWORDLEN];
1573 static int attempts = 0;
1574
1575 /*
1576 * Make copies of apasswd and auser, then null-terminate them.
1577 * If there are unprintable characters in the password, make
1578 * them visible.
1579 */
1580 slprintf(ppp_settings.passwd, sizeof(ppp_settings.passwd), "%.*v", passwdlen, apasswd);
1581 slprintf(ppp_settings.user, sizeof(ppp_settings.user), "%.*v", userlen, auser);
1582 *msg = "";
1583
1584 /*
1585 * Check if a plugin wants to handle this.
1586 */
1587 if (pap_auth_hook) {
1588 ret = (*pap_auth_hook)(ppp_settings.user, ppp_settings.passwd, msg, &addrs, &opts);
1589 if (ret >= 0) {
1590 /* note: set_allowed_addrs() saves opts (but not addrs):
1591 don't free it! */
1592 if (ret)
1593 set_allowed_addrs(unit, addrs, opts);
1594 else if (opts != 0)
1595 free_wordlist(opts);
1596 if (addrs != 0)
1597 free_wordlist(addrs);
1598 BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd));
1599 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1600 }
1601 }
1602
1603 /*
1604 * Open the file of pap secrets and scan for a suitable secret
1605 * for authenticating this user.
1606 */
1607 filename = _PATH_UPAPFILE;
1608 addrs = opts = NULL;
1609 ret = UPAP_AUTHNAK;
1610 f = fopen(filename, "r");
1611 if (f == NULL) {
1612 ppp_error("Can't open PAP password file %s: %m", filename);
1613
1614 } else {
1615 check_access(f, filename);
1616 if (scan_authfile(f, ppp_settings.user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1617 ppp_warn("no PAP secret found for %s", user);
1618 } else {
1619 /*
1620 * If the secret is "@login", it means to check
1621 * the password against the login database.
1622 */
1623 int login_secret = strcmp(secret, "@login") == 0;
1624 ret = UPAP_AUTHACK;
1625 if (uselogin || login_secret) {
1626 /* login option or secret is @login */
1627 if (session_full(ppp_settings.user, ppp_settings.passwd, devnam, msg) == 0) {
1628 ret = UPAP_AUTHNAK;
1629 }
1630 } else if (session_mgmt) {
1631 if (session_check(ppp_settings.user, NULL, devnam, NULL) == 0) {
1632 ppp_warn("Peer %q failed PAP Session verification", user);
1633 ret = UPAP_AUTHNAK;
1634 }
1635 }
1636 if (secret[0] != 0 && !login_secret) {
1637 /* password given in pap-secrets - must match */
1638 if ((cryptpap || strcmp(ppp_settings.passwd, secret) != 0)
1639 && strcmp(crypt(ppp_settings.passwd, secret), secret) != 0)
1640 ret = UPAP_AUTHNAK;
1641 }
1642 }
1643 fclose(f);
1644 }
1645
1646 if (ret == UPAP_AUTHNAK) {
1647 if (**msg == 0)
1648 *msg = "Login incorrect";
1649 /*
1650 * XXX can we ever get here more than once??
1651 * Frustrate passwd stealer programs.
1652 * Allow 10 tries, but start backing off after 3 (stolen from login).
1653 * On 10'th, drop the connection.
1654 */
1655 if (attempts++ >= 10) {
1656 ppp_warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1657 lcp_close(pcb, "login failed");
1658 }
1659 if (attempts > 3)
1660 sleep((u_int) (attempts - 3) * 5);
1661 if (opts != NULL)
1662 free_wordlist(opts);
1663
1664 } else {
1665 attempts = 0; /* Reset count */
1666 if (**msg == 0)
1667 *msg = "Login ok";
1668 set_allowed_addrs(unit, addrs, opts);
1669 }
1670
1671 if (addrs != NULL)
1672 free_wordlist(addrs);
1673 BZERO(ppp_settings.passwd, sizeof(ppp_settings.passwd));
1674 BZERO(secret, sizeof(secret));
1675
1676 return ret;
1677 }
1678
1679 /*
1680 * null_login - Check if a username of "" and a password of "" are
1681 * acceptable, and iff so, set the list of acceptable IP addresses
1682 * and return 1.
1683 */
1684 static int
1685 null_login(unit)
1686 int unit;
1687 {
1688 char *filename;
1689 FILE *f;
1690 int i, ret;
1691 struct wordlist *addrs, *opts;
1692 char secret[MAXWORDLEN];
1693
1694 /*
1695 * Check if a plugin wants to handle this.
1696 */
1697 ret = -1;
1698 if (null_auth_hook)
1699 ret = (*null_auth_hook)(&addrs, &opts);
1700
1701 /*
1702 * Open the file of pap secrets and scan for a suitable secret.
1703 */
1704 if (ret <= 0) {
1705 filename = _PATH_UPAPFILE;
1706 addrs = NULL;
1707 f = fopen(filename, "r");
1708 if (f == NULL)
1709 return 0;
1710 check_access(f, filename);
1711
1712 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1713 ret = i >= 0 && secret[0] == 0;
1714 BZERO(secret, sizeof(secret));
1715 fclose(f);
1716 }
1717
1718 if (ret)
1719 set_allowed_addrs(unit, addrs, opts);
1720 else if (opts != 0)
1721 free_wordlist(opts);
1722 if (addrs != 0)
1723 free_wordlist(addrs);
1724
1725 return ret;
1726 }
1727
1728 /*
1729 * get_pap_passwd - get a password for authenticating ourselves with
1730 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1731 * could be found.
1732 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1733 */
1734 static int
1735 get_pap_passwd(passwd)
1736 char *passwd;
1737 {
1738 char *filename;
1739 FILE *f;
1740 int ret;
1741 char secret[MAXWORDLEN];
1742
1743 /*
1744 * Check whether a plugin wants to supply this.
1745 */
1746 if (pap_passwd_hook) {
1747 ret = (*pap_passwd_hook)(ppp_settings,user, ppp_settings.passwd);
1748 if (ret >= 0)
1749 return ret;
1750 }
1751
1752 filename = _PATH_UPAPFILE;
1753 f = fopen(filename, "r");
1754 if (f == NULL)
1755 return 0;
1756 check_access(f, filename);
1757 ret = scan_authfile(f, user,
1758 (remote_name[0]? remote_name: NULL),
1759 secret, NULL, NULL, filename, 0);
1760 fclose(f);
1761 if (ret < 0)
1762 return 0;
1763 if (passwd != NULL)
1764 strlcpy(passwd, secret, MAXSECRETLEN);
1765 BZERO(secret, sizeof(secret));
1766 return 1;
1767 }
1768
1769 /*
1770 * have_pap_secret - check whether we have a PAP file with any
1771 * secrets that we could possibly use for authenticating the peer.
1772 */
1773 static int
1774 have_pap_secret(lacks_ipp)
1775 int *lacks_ipp;
1776 {
1777 FILE *f;
1778 int ret;
1779 char *filename;
1780 struct wordlist *addrs;
1781
1782 /* let the plugin decide, if there is one */
1783 if (pap_check_hook) {
1784 ret = (*pap_check_hook)();
1785 if (ret >= 0)
1786 return ret;
1787 }
1788
1789 filename = _PATH_UPAPFILE;
1790 f = fopen(filename, "r");
1791 if (f == NULL)
1792 return 0;
1793
1794 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1795 NULL, &addrs, NULL, filename, 0);
1796 fclose(f);
1797 if (ret >= 0 && !some_ip_ok(addrs)) {
1798 if (lacks_ipp != 0)
1799 *lacks_ipp = 1;
1800 ret = -1;
1801 }
1802 if (addrs != 0)
1803 free_wordlist(addrs);
1804
1805 return ret >= 0;
1806 }
1807
1808 /*
1809 * have_chap_secret - check whether we have a CHAP file with a
1810 * secret that we could possibly use for authenticating `client'
1811 * on `server'. Either can be the null string, meaning we don't
1812 * know the identity yet.
1813 */
1814 static int
1815 have_chap_secret(client, server, need_ip, lacks_ipp)
1816 char *client;
1817 char *server;
1818 int need_ip;
1819 int *lacks_ipp;
1820 {
1821 FILE *f;
1822 int ret;
1823 char *filename;
1824 struct wordlist *addrs;
1825
1826 if (chap_check_hook) {
1827 ret = (*chap_check_hook)();
1828 if (ret >= 0) {
1829 return ret;
1830 }
1831 }
1832
1833 filename = _PATH_CHAPFILE;
1834 f = fopen(filename, "r");
1835 if (f == NULL)
1836 return 0;
1837
1838 if (client != NULL && client[0] == 0)
1839 client = NULL;
1840 else if (server != NULL && server[0] == 0)
1841 server = NULL;
1842
1843 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1844 fclose(f);
1845 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1846 if (lacks_ipp != 0)
1847 *lacks_ipp = 1;
1848 ret = -1;
1849 }
1850 if (addrs != 0)
1851 free_wordlist(addrs);
1852
1853 return ret >= 0;
1854 }
1855
1856 /*
1857 * have_srp_secret - check whether we have a SRP file with a
1858 * secret that we could possibly use for authenticating `client'
1859 * on `server'. Either can be the null string, meaning we don't
1860 * know the identity yet.
1861 */
1862 static int
1863 have_srp_secret(client, server, need_ip, lacks_ipp)
1864 char *client;
1865 char *server;
1866 int need_ip;
1867 int *lacks_ipp;
1868 {
1869 FILE *f;
1870 int ret;
1871 char *filename;
1872 struct wordlist *addrs;
1873
1874 filename = _PATH_SRPFILE;
1875 f = fopen(filename, "r");
1876 if (f == NULL)
1877 return 0;
1878
1879 if (client != NULL && client[0] == 0)
1880 client = NULL;
1881 else if (server != NULL && server[0] == 0)
1882 server = NULL;
1883
1884 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1885 fclose(f);
1886 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1887 if (lacks_ipp != 0)
1888 *lacks_ipp = 1;
1889 ret = -1;
1890 }
1891 if (addrs != 0)
1892 free_wordlist(addrs);
1893
1894 return ret >= 0;
1895 }
1896 #endif /* UNUSED */
1897
1898 #if PPP_AUTH_SUPPORT
1899 /*
1900 * get_secret - open the CHAP secret file and return the secret
1901 * for authenticating the given client on the given server.
1902 * (We could be either client or server).
1903 */
get_secret(ppp_pcb * pcb,const char * client,const char * server,char * secret,int * secret_len,int am_server)1904 int get_secret(ppp_pcb *pcb, const char *client, const char *server, char *secret, int *secret_len, int am_server) {
1905 int len;
1906 LWIP_UNUSED_ARG(server);
1907 LWIP_UNUSED_ARG(am_server);
1908
1909 if (!client || !client[0] || !pcb->settings.user || !pcb->settings.passwd || strcmp(client, pcb->settings.user)) {
1910 return 0;
1911 }
1912
1913 len = (int)strlen(pcb->settings.passwd);
1914 if (len > MAXSECRETLEN) {
1915 ppp_error("Secret for %s on %s is too long", client, server);
1916 len = MAXSECRETLEN;
1917 }
1918
1919 MEMCPY(secret, pcb->settings.passwd, len);
1920 *secret_len = len;
1921 return 1;
1922
1923 #if 0 /* UNUSED */
1924 FILE *f;
1925 int ret, len;
1926 char *filename;
1927 struct wordlist *addrs, *opts;
1928 char secbuf[MAXWORDLEN];
1929 struct wordlist *addrs;
1930 addrs = NULL;
1931
1932 if (!am_server && ppp_settings.passwd[0] != 0) {
1933 strlcpy(secbuf, ppp_settings.passwd, sizeof(secbuf));
1934 } else if (!am_server && chap_passwd_hook) {
1935 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1936 ppp_error("Unable to obtain CHAP password for %s on %s from plugin",
1937 client, server);
1938 return 0;
1939 }
1940 } else {
1941 filename = _PATH_CHAPFILE;
1942 addrs = NULL;
1943 secbuf[0] = 0;
1944
1945 f = fopen(filename, "r");
1946 if (f == NULL) {
1947 ppp_error("Can't open chap secret file %s: %m", filename);
1948 return 0;
1949 }
1950 check_access(f, filename);
1951
1952 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1953 fclose(f);
1954 if (ret < 0)
1955 return 0;
1956
1957 if (am_server)
1958 set_allowed_addrs(unit, addrs, opts);
1959 else if (opts != 0)
1960 free_wordlist(opts);
1961 if (addrs != 0)
1962 free_wordlist(addrs);
1963 }
1964
1965 len = strlen(secbuf);
1966 if (len > MAXSECRETLEN) {
1967 ppp_error("Secret for %s on %s is too long", client, server);
1968 len = MAXSECRETLEN;
1969 }
1970 MEMCPY(secret, secbuf, len);
1971 BZERO(secbuf, sizeof(secbuf));
1972 *secret_len = len;
1973
1974 return 1;
1975 #endif /* UNUSED */
1976 }
1977 #endif /* PPP_AUTH_SUPPORT */
1978
1979
1980 #if 0 /* UNUSED */
1981 /*
1982 * get_srp_secret - open the SRP secret file and return the secret
1983 * for authenticating the given client on the given server.
1984 * (We could be either client or server).
1985 */
1986 int
1987 get_srp_secret(unit, client, server, secret, am_server)
1988 int unit;
1989 char *client;
1990 char *server;
1991 char *secret;
1992 int am_server;
1993 {
1994 FILE *fp;
1995 int ret;
1996 char *filename;
1997 struct wordlist *addrs, *opts;
1998
1999 if (!am_server && ppp_settings.passwd[0] != '\0') {
2000 strlcpy(secret, ppp_settings.passwd, MAXWORDLEN);
2001 } else {
2002 filename = _PATH_SRPFILE;
2003 addrs = NULL;
2004
2005 fp = fopen(filename, "r");
2006 if (fp == NULL) {
2007 ppp_error("Can't open srp secret file %s: %m", filename);
2008 return 0;
2009 }
2010 check_access(fp, filename);
2011
2012 secret[0] = '\0';
2013 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
2014 filename, am_server);
2015 fclose(fp);
2016 if (ret < 0)
2017 return 0;
2018
2019 if (am_server)
2020 set_allowed_addrs(unit, addrs, opts);
2021 else if (opts != NULL)
2022 free_wordlist(opts);
2023 if (addrs != NULL)
2024 free_wordlist(addrs);
2025 }
2026
2027 return 1;
2028 }
2029
2030 /*
2031 * set_allowed_addrs() - set the list of allowed addresses.
2032 * Also looks for `--' indicating options to apply for this peer
2033 * and leaves the following words in extra_options.
2034 */
2035 static void
2036 set_allowed_addrs(unit, addrs, opts)
2037 int unit;
2038 struct wordlist *addrs;
2039 struct wordlist *opts;
2040 {
2041 int n;
2042 struct wordlist *ap, **plink;
2043 struct permitted_ip *ip;
2044 char *ptr_word, *ptr_mask;
2045 struct hostent *hp;
2046 struct netent *np;
2047 u32_t a, mask, ah, offset;
2048 struct ipcp_options *wo = &ipcp_wantoptions[unit];
2049 u32_t suggested_ip = 0;
2050
2051 if (addresses[unit] != NULL)
2052 free(addresses[unit]);
2053 addresses[unit] = NULL;
2054 if (extra_options != NULL)
2055 free_wordlist(extra_options);
2056 extra_options = opts;
2057
2058 /*
2059 * Count the number of IP addresses given.
2060 */
2061 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
2062 if (n == 0)
2063 return;
2064 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
2065 if (ip == 0)
2066 return;
2067
2068 /* temporarily append the noauth_addrs list to addrs */
2069 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
2070 ;
2071 *plink = noauth_addrs;
2072
2073 n = 0;
2074 for (ap = addrs; ap != NULL; ap = ap->next) {
2075 /* "-" means no addresses authorized, "*" means any address allowed */
2076 ptr_word = ap->word;
2077 if (strcmp(ptr_word, "-") == 0)
2078 break;
2079 if (strcmp(ptr_word, "*") == 0) {
2080 ip[n].permit = 1;
2081 ip[n].base = ip[n].mask = 0;
2082 ++n;
2083 break;
2084 }
2085
2086 ip[n].permit = 1;
2087 if (*ptr_word == '!') {
2088 ip[n].permit = 0;
2089 ++ptr_word;
2090 }
2091
2092 mask = ~ (u32_t) 0;
2093 offset = 0;
2094 ptr_mask = strchr (ptr_word, '/');
2095 if (ptr_mask != NULL) {
2096 int bit_count;
2097 char *endp;
2098
2099 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
2100 if (bit_count <= 0 || bit_count > 32) {
2101 ppp_warn("invalid address length %v in auth. address list",
2102 ptr_mask+1);
2103 continue;
2104 }
2105 bit_count = 32 - bit_count; /* # bits in host part */
2106 if (*endp == '+') {
2107 offset = ifunit + 1;
2108 ++endp;
2109 }
2110 if (*endp != 0) {
2111 ppp_warn("invalid address length syntax: %v", ptr_mask+1);
2112 continue;
2113 }
2114 *ptr_mask = '\0';
2115 mask <<= bit_count;
2116 }
2117
2118 hp = gethostbyname(ptr_word);
2119 if (hp != NULL && hp->h_addrtype == AF_INET) {
2120 a = *(u32_t *)hp->h_addr;
2121 } else {
2122 np = getnetbyname (ptr_word);
2123 if (np != NULL && np->n_addrtype == AF_INET) {
2124 a = lwip_htonl ((u32_t)np->n_net);
2125 if (ptr_mask == NULL) {
2126 /* calculate appropriate mask for net */
2127 ah = lwip_ntohl(a);
2128 if (IN_CLASSA(ah))
2129 mask = IN_CLASSA_NET;
2130 else if (IN_CLASSB(ah))
2131 mask = IN_CLASSB_NET;
2132 else if (IN_CLASSC(ah))
2133 mask = IN_CLASSC_NET;
2134 }
2135 } else {
2136 a = inet_addr (ptr_word);
2137 }
2138 }
2139
2140 if (ptr_mask != NULL)
2141 *ptr_mask = '/';
2142
2143 if (a == (u32_t)-1L) {
2144 ppp_warn("unknown host %s in auth. address list", ap->word);
2145 continue;
2146 }
2147 if (offset != 0) {
2148 if (offset >= ~mask) {
2149 ppp_warn("interface unit %d too large for subnet %v",
2150 ifunit, ptr_word);
2151 continue;
2152 }
2153 a = lwip_htonl((lwip_ntohl(a) & mask) + offset);
2154 mask = ~(u32_t)0;
2155 }
2156 ip[n].mask = lwip_htonl(mask);
2157 ip[n].base = a & ip[n].mask;
2158 ++n;
2159 if (~mask == 0 && suggested_ip == 0)
2160 suggested_ip = a;
2161 }
2162 *plink = NULL;
2163
2164 ip[n].permit = 0; /* make the last entry forbid all addresses */
2165 ip[n].base = 0; /* to terminate the list */
2166 ip[n].mask = 0;
2167
2168 addresses[unit] = ip;
2169
2170 /*
2171 * If the address given for the peer isn't authorized, or if
2172 * the user hasn't given one, AND there is an authorized address
2173 * which is a single host, then use that if we find one.
2174 */
2175 if (suggested_ip != 0
2176 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2177 wo->hisaddr = suggested_ip;
2178 /*
2179 * Do we insist on this address? No, if there are other
2180 * addresses authorized than the suggested one.
2181 */
2182 if (n > 1)
2183 wo->accept_remote = 1;
2184 }
2185 }
2186
2187 /*
2188 * auth_ip_addr - check whether the peer is authorized to use
2189 * a given IP address. Returns 1 if authorized, 0 otherwise.
2190 */
2191 int
2192 auth_ip_addr(unit, addr)
2193 int unit;
2194 u32_t addr;
2195 {
2196 int ok;
2197
2198 /* don't allow loopback or multicast address */
2199 if (bad_ip_adrs(addr))
2200 return 0;
2201
2202 if (allowed_address_hook) {
2203 ok = allowed_address_hook(addr);
2204 if (ok >= 0) return ok;
2205 }
2206
2207 if (addresses[unit] != NULL) {
2208 ok = ip_addr_check(addr, addresses[unit]);
2209 if (ok >= 0)
2210 return ok;
2211 }
2212
2213 if (auth_required)
2214 return 0; /* no addresses authorized */
2215 return allow_any_ip || privileged || !have_route_to(addr);
2216 }
2217
2218 static int
2219 ip_addr_check(addr, addrs)
2220 u32_t addr;
2221 struct permitted_ip *addrs;
2222 {
2223 for (; ; ++addrs)
2224 if ((addr & addrs->mask) == addrs->base)
2225 return addrs->permit;
2226 }
2227
2228 /*
2229 * bad_ip_adrs - return 1 if the IP address is one we don't want
2230 * to use, such as an address in the loopback net or a multicast address.
2231 * addr is in network byte order.
2232 */
2233 int
2234 bad_ip_adrs(addr)
2235 u32_t addr;
2236 {
2237 addr = lwip_ntohl(addr);
2238 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2239 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2240 }
2241
2242 /*
2243 * some_ip_ok - check a wordlist to see if it authorizes any
2244 * IP address(es).
2245 */
2246 static int
2247 some_ip_ok(addrs)
2248 struct wordlist *addrs;
2249 {
2250 for (; addrs != 0; addrs = addrs->next) {
2251 if (addrs->word[0] == '-')
2252 break;
2253 if (addrs->word[0] != '!')
2254 return 1; /* some IP address is allowed */
2255 }
2256 return 0;
2257 }
2258
2259 /*
2260 * auth_number - check whether the remote number is allowed to connect.
2261 * Returns 1 if authorized, 0 otherwise.
2262 */
2263 int
2264 auth_number()
2265 {
2266 struct wordlist *wp = permitted_numbers;
2267 int l;
2268
2269 /* Allow all if no authorization list. */
2270 if (!wp)
2271 return 1;
2272
2273 /* Allow if we have a match in the authorization list. */
2274 while (wp) {
2275 /* trailing '*' wildcard */
2276 l = strlen(wp->word);
2277 if ((wp->word)[l - 1] == '*')
2278 l--;
2279 if (!strncasecmp(wp->word, remote_number, l))
2280 return 1;
2281 wp = wp->next;
2282 }
2283
2284 return 0;
2285 }
2286
2287 /*
2288 * check_access - complain if a secret file has too-liberal permissions.
2289 */
2290 static void
2291 check_access(f, filename)
2292 FILE *f;
2293 char *filename;
2294 {
2295 struct stat sbuf;
2296
2297 if (fstat(fileno(f), &sbuf) < 0) {
2298 ppp_warn("cannot stat secret file %s: %m", filename);
2299 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2300 ppp_warn("Warning - secret file %s has world and/or group access",
2301 filename);
2302 }
2303 }
2304
2305 /*
2306 * scan_authfile - Scan an authorization file for a secret suitable
2307 * for authenticating `client' on `server'. The return value is -1
2308 * if no secret is found, otherwise >= 0. The return value has
2309 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2310 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2311 * Any following words on the line up to a "--" (i.e. address authorization
2312 * info) are placed in a wordlist and returned in *addrs. Any
2313 * following words (extra options) are placed in a wordlist and
2314 * returned in *opts.
2315 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2316 * Flags are non-zero if we need two colons in the secret in order to
2317 * match.
2318 */
2319 static int
2320 scan_authfile(f, client, server, secret, addrs, opts, filename, flags)
2321 FILE *f;
2322 char *client;
2323 char *server;
2324 char *secret;
2325 struct wordlist **addrs;
2326 struct wordlist **opts;
2327 char *filename;
2328 int flags;
2329 {
2330 int newline, xxx;
2331 int got_flag, best_flag;
2332 FILE *sf;
2333 struct wordlist *ap, *addr_list, *alist, **app;
2334 char word[MAXWORDLEN];
2335 char atfile[MAXWORDLEN];
2336 char lsecret[MAXWORDLEN];
2337 char *cp;
2338
2339 if (addrs != NULL)
2340 *addrs = NULL;
2341 if (opts != NULL)
2342 *opts = NULL;
2343 addr_list = NULL;
2344 if (!getword(f, word, &newline, filename))
2345 return -1; /* file is empty??? */
2346 newline = 1;
2347 best_flag = -1;
2348 for (;;) {
2349 /*
2350 * Skip until we find a word at the start of a line.
2351 */
2352 while (!newline && getword(f, word, &newline, filename))
2353 ;
2354 if (!newline)
2355 break; /* got to end of file */
2356
2357 /*
2358 * Got a client - check if it's a match or a wildcard.
2359 */
2360 got_flag = 0;
2361 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2362 newline = 0;
2363 continue;
2364 }
2365 if (!ISWILD(word))
2366 got_flag = NONWILD_CLIENT;
2367
2368 /*
2369 * Now get a server and check if it matches.
2370 */
2371 if (!getword(f, word, &newline, filename))
2372 break;
2373 if (newline)
2374 continue;
2375 if (!ISWILD(word)) {
2376 if (server != NULL && strcmp(word, server) != 0)
2377 continue;
2378 got_flag |= NONWILD_SERVER;
2379 }
2380
2381 /*
2382 * Got some sort of a match - see if it's better than what
2383 * we have already.
2384 */
2385 if (got_flag <= best_flag)
2386 continue;
2387
2388 /*
2389 * Get the secret.
2390 */
2391 if (!getword(f, word, &newline, filename))
2392 break;
2393 if (newline)
2394 continue;
2395
2396 /*
2397 * SRP-SHA1 authenticator should never be reading secrets from
2398 * a file. (Authenticatee may, though.)
2399 */
2400 if (flags && ((cp = strchr(word, ':')) == NULL ||
2401 strchr(cp + 1, ':') == NULL))
2402 continue;
2403
2404 if (secret != NULL) {
2405 /*
2406 * Special syntax: @/pathname means read secret from file.
2407 */
2408 if (word[0] == '@' && word[1] == '/') {
2409 strlcpy(atfile, word+1, sizeof(atfile));
2410 if ((sf = fopen(atfile, "r")) == NULL) {
2411 ppp_warn("can't open indirect secret file %s", atfile);
2412 continue;
2413 }
2414 check_access(sf, atfile);
2415 if (!getword(sf, word, &xxx, atfile)) {
2416 ppp_warn("no secret in indirect secret file %s", atfile);
2417 fclose(sf);
2418 continue;
2419 }
2420 fclose(sf);
2421 }
2422 strlcpy(lsecret, word, sizeof(lsecret));
2423 }
2424
2425 /*
2426 * Now read address authorization info and make a wordlist.
2427 */
2428 app = &alist;
2429 for (;;) {
2430 if (!getword(f, word, &newline, filename) || newline)
2431 break;
2432 ap = (struct wordlist *)
2433 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2434 if (ap == NULL)
2435 novm("authorized addresses");
2436 ap->word = (char *) (ap + 1);
2437 strcpy(ap->word, word);
2438 *app = ap;
2439 app = &ap->next;
2440 }
2441 *app = NULL;
2442
2443 /*
2444 * This is the best so far; remember it.
2445 */
2446 best_flag = got_flag;
2447 if (addr_list)
2448 free_wordlist(addr_list);
2449 addr_list = alist;
2450 if (secret != NULL)
2451 strlcpy(secret, lsecret, MAXWORDLEN);
2452
2453 if (!newline)
2454 break;
2455 }
2456
2457 /* scan for a -- word indicating the start of options */
2458 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2459 if (strcmp(ap->word, "--") == 0)
2460 break;
2461 /* ap = start of options */
2462 if (ap != NULL) {
2463 ap = ap->next; /* first option */
2464 free(*app); /* free the "--" word */
2465 *app = NULL; /* terminate addr list */
2466 }
2467 if (opts != NULL)
2468 *opts = ap;
2469 else if (ap != NULL)
2470 free_wordlist(ap);
2471 if (addrs != NULL)
2472 *addrs = addr_list;
2473 else if (addr_list != NULL)
2474 free_wordlist(addr_list);
2475
2476 return best_flag;
2477 }
2478
2479 /*
2480 * wordlist_count - return the number of items in a wordlist
2481 */
2482 static int
2483 wordlist_count(wp)
2484 struct wordlist *wp;
2485 {
2486 int n;
2487
2488 for (n = 0; wp != NULL; wp = wp->next)
2489 ++n;
2490 return n;
2491 }
2492
2493 /*
2494 * free_wordlist - release memory allocated for a wordlist.
2495 */
2496 static void
2497 free_wordlist(wp)
2498 struct wordlist *wp;
2499 {
2500 struct wordlist *next;
2501
2502 while (wp != NULL) {
2503 next = wp->next;
2504 free(wp);
2505 wp = next;
2506 }
2507 }
2508 #endif /* UNUSED */
2509
2510 #endif /* PPP_SUPPORT */
2511