2 * auth.c - PPP authentication and phase control.
4 * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
17 * 3. Redistributions of any form whatsoever must retain the following
19 * "This product includes software developed by Paul Mackerras
20 * <paulus@samba.org>".
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.
30 * Derived from main.c, which is:
32 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
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
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
53 * Pittsburgh, PA 15213-3890
54 * (412) 268-4387, fax: (412) 268-7395
55 * tech-transfer@andrew.cmu.edu
57 * 4. Redistributions of any form whatsoever must retain the following
59 * "This product includes software developed by Computing Services
60 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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.
71 #define RCSID "$Id: auth.c,v 1.103 2005/03/21 09:20:16 paulus Exp $"
81 #include <sys/types.h>
83 #include <sys/socket.h>
86 #if defined(_PATH_LASTLOG) && defined(__linux__)
91 #include <netinet/in.h>
92 #include <arpa/inet.h>
95 #include <security/pam_appl.h>
101 #define PW_PPP PW_LOGIN
113 #include "chap-new.h"
118 #include "pathnames.h"
120 static const char rcsid[] = RCSID;
122 /* Bits in scan_authfile return value */
123 #define NONWILD_SERVER 1
124 #define NONWILD_CLIENT 2
126 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
128 /* The name by which the peer authenticated itself to us. */
129 char peer_authname[MAXNAMELEN];
131 /* Records which authentication operations haven't completed yet. */
132 static int auth_pending[NUM_PPP];
134 /* Records which authentication operations have been completed. */
135 int auth_done[NUM_PPP];
137 /* Set if we have successfully called plogin() */
138 static int logged_in;
140 /* List of addresses which the peer may use. */
141 static struct permitted_ip *addresses[NUM_PPP];
143 /* Wordlist giving addresses which the peer may use
144 without authenticating itself. */
145 static struct wordlist *noauth_addrs;
147 /* Remote telephone number, if available */
148 char remote_number[MAXNAMELEN];
150 /* Wordlist giving remote telephone numbers which may connect. */
151 static struct wordlist *permitted_numbers;
153 /* Extra options to apply, from the secrets file entry for the peer. */
154 static struct wordlist *extra_options;
156 /* Number of network protocols which we have opened. */
157 static int num_np_open;
159 /* Number of network protocols which have come up. */
160 static int num_np_up;
162 /* Set if we got the contents of passwd[] from the pap-secrets file. */
163 static int passwd_from_file;
165 /* Set if we require authentication only because we have a default route. */
166 static bool default_auth;
168 /* Hook to enable a plugin to control the idle time limit */
169 int (*idle_time_hook) __P((struct ppp_idle *)) = NULL;
171 /* Hook for a plugin to say whether we can possibly authenticate any peer */
172 int (*pap_check_hook) __P((void)) = NULL;
174 /* Hook for a plugin to check the PAP user and password */
175 int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
176 struct wordlist **paddrs,
177 struct wordlist **popts)) = NULL;
179 /* Hook for a plugin to know about the PAP user logout */
180 void (*pap_logout_hook) __P((void)) = NULL;
182 /* Hook for a plugin to get the PAP password for authenticating us */
183 int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL;
185 /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */
186 int (*chap_check_hook) __P((void)) = NULL;
188 /* Hook for a plugin to get the CHAP password for authenticating us */
189 int (*chap_passwd_hook) __P((char *user, char *passwd)) = NULL;
191 /* Hook for a plugin to say whether it is OK if the peer
192 refuses to authenticate. */
193 int (*null_auth_hook) __P((struct wordlist **paddrs,
194 struct wordlist **popts)) = NULL;
196 int (*allowed_address_hook) __P((u_int32_t addr)) = NULL;
198 /* A notifier for when the peer has authenticated itself,
199 and we are proceeding to the network phase. */
200 struct notifier *auth_up_notifier = NULL;
202 /* A notifier for when the link goes down. */
203 struct notifier *link_down_notifier = NULL;
206 * This is used to ensure that we don't start an auth-up/down
207 * script while one is already running.
214 static enum script_state auth_state = s_down;
215 static enum script_state auth_script_state = s_down;
216 static pid_t auth_script_pid = 0;
218 static int used_login; /* peer authenticated against login database */
223 bool uselogin = 0; /* Use /etc/passwd for checking PAP */
224 bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
225 bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
226 bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
227 bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */
229 bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */
230 bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */
232 bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */
233 bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */
235 bool usehostname = 0; /* Use hostname for our_name */
236 bool auth_required = 0; /* Always require authentication from peer */
237 bool allow_any_ip = 0; /* Allow peer to use any IP address */
238 bool explicit_remote = 0; /* User specified explicit remote name */
239 char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
241 static char *uafname; /* name of most recent +ua file */
243 extern char *crypt __P((const char *, const char *));
245 /* Prototypes for procedures local to this file. */
247 static void network_phase __P((int));
248 static void check_idle __P((void *));
249 static void connect_time_expired __P((void *));
250 static int plogin __P((char *, char *, char **));
251 static void plogout __P((void));
252 static int null_login __P((int));
253 static int get_pap_passwd __P((char *));
254 static int have_pap_secret __P((int *));
255 static int have_chap_secret __P((char *, char *, int, int *));
256 static int have_srp_secret __P((char *client, char *server, int need_ip,
258 static int ip_addr_check __P((u_int32_t, struct permitted_ip *));
259 static int scan_authfile __P((FILE *, char *, char *, char *,
260 struct wordlist **, struct wordlist **,
262 static void free_wordlist __P((struct wordlist *));
263 static void auth_script __P((char *));
264 static void auth_script_done __P((void *));
265 static void set_allowed_addrs __P((int, struct wordlist *, struct wordlist *));
266 static int some_ip_ok __P((struct wordlist *));
267 static int setupapfile __P((char **));
268 static int privgroup __P((char **));
269 static int set_noauth_addr __P((char **));
270 static int set_permitted_number __P((char **));
271 static void check_access __P((FILE *, char *));
272 static int wordlist_count __P((struct wordlist *));
275 static void check_maxoctets __P((void *));
279 * Authentication-related options.
281 option_t auth_options[] = {
282 { "auth", o_bool, &auth_required,
283 "Require authentication from peer", OPT_PRIO | 1 },
284 { "noauth", o_bool, &auth_required,
285 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
287 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
288 "Require PAP authentication from peer",
289 OPT_PRIOSUB | 1, &auth_required },
290 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
291 "Require PAP authentication from peer",
292 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
293 { "require-chap", o_bool, &auth_required,
294 "Require CHAP authentication from peer",
295 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
296 &lcp_wantoptions[0].chap_mdtype },
297 { "+chap", o_bool, &auth_required,
298 "Require CHAP authentication from peer",
299 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
300 &lcp_wantoptions[0].chap_mdtype },
302 { "require-mschap", o_bool, &auth_required,
303 "Require MS-CHAP authentication from peer",
304 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
305 &lcp_wantoptions[0].chap_mdtype },
306 { "+mschap", o_bool, &auth_required,
307 "Require MS-CHAP authentication from peer",
308 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
309 &lcp_wantoptions[0].chap_mdtype },
310 { "require-mschap-v2", o_bool, &auth_required,
311 "Require MS-CHAPv2 authentication from peer",
312 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
313 &lcp_wantoptions[0].chap_mdtype },
314 { "+mschap-v2", o_bool, &auth_required,
315 "Require MS-CHAPv2 authentication from peer",
316 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
317 &lcp_wantoptions[0].chap_mdtype },
320 { "refuse-pap", o_bool, &refuse_pap,
321 "Don't agree to auth to peer with PAP", 1 },
322 { "-pap", o_bool, &refuse_pap,
323 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
324 { "refuse-chap", o_bool, &refuse_chap,
325 "Don't agree to auth to peer with CHAP",
326 OPT_A2CLRB | MDTYPE_MD5,
327 &lcp_allowoptions[0].chap_mdtype },
328 { "-chap", o_bool, &refuse_chap,
329 "Don't allow CHAP authentication with peer",
330 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
331 &lcp_allowoptions[0].chap_mdtype },
333 { "refuse-mschap", o_bool, &refuse_mschap,
334 "Don't agree to auth to peer with MS-CHAP",
335 OPT_A2CLRB | MDTYPE_MICROSOFT,
336 &lcp_allowoptions[0].chap_mdtype },
337 { "-mschap", o_bool, &refuse_mschap,
338 "Don't allow MS-CHAP authentication with peer",
339 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
340 &lcp_allowoptions[0].chap_mdtype },
341 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
342 "Don't agree to auth to peer with MS-CHAPv2",
343 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
344 &lcp_allowoptions[0].chap_mdtype },
345 { "-mschap-v2", o_bool, &refuse_mschap_v2,
346 "Don't allow MS-CHAPv2 authentication with peer",
347 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
348 &lcp_allowoptions[0].chap_mdtype },
351 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
352 "Require EAP authentication from peer", OPT_PRIOSUB | 1,
354 { "refuse-eap", o_bool, &refuse_eap,
355 "Don't agree to authenticate to peer with EAP", 1 },
357 { "name", o_string, our_name,
358 "Set local name for authentication",
359 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
361 { "+ua", o_special, (void *)setupapfile,
362 "Get PAP user and password from file",
363 OPT_PRIO | OPT_A2STRVAL, &uafname },
365 { "user", o_string, user,
366 "Set name for auth with peer", OPT_PRIO | OPT_STATIC, NULL, MAXNAMELEN },
368 { "password", o_string, passwd,
369 "Password for authenticating us to the peer",
370 OPT_PRIO | OPT_STATIC | OPT_HIDE, NULL, MAXSECRETLEN },
372 { "usehostname", o_bool, &usehostname,
373 "Must use hostname for authentication", 1 },
375 { "remotename", o_string, remote_name,
376 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
377 &explicit_remote, MAXNAMELEN },
379 { "login", o_bool, &uselogin,
380 "Use system password database for PAP", 1 },
382 { "papcrypt", o_bool, &cryptpap,
383 "PAP passwords are encrypted", 1 },
385 { "privgroup", o_special, (void *)privgroup,
386 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
388 { "allow-ip", o_special, (void *)set_noauth_addr,
389 "Set IP address(es) which can be used without authentication",
390 OPT_PRIV | OPT_A2LIST },
392 { "remotenumber", o_string, remote_number,
393 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
396 { "allow-number", o_special, (void *)set_permitted_number,
397 "Set telephone number(s) which are allowed to connect",
398 OPT_PRIV | OPT_A2LIST },
404 * setupapfile - specifies UPAP info for authenticating with peer.
412 char u[MAXNAMELEN], p[MAXSECRETLEN];
415 lcp_allowoptions[0].neg_upap = 1;
417 /* open user info file */
418 fname = strdup(*argv);
420 novm("+ua file name");
422 ufile = fopen(fname, "r");
425 option_error("unable to open user login data file %s", fname);
428 check_access(ufile, fname);
432 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
433 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
435 option_error("unable to read user login data file %s", fname);
440 /* get rid of newlines */
442 if (l > 0 && u[l-1] == '\n')
445 if (l > 0 && p[l-1] == '\n')
448 if (override_value("user", option_priority, fname))
449 strlcpy(user, u, sizeof(user));
450 if (override_value("passwd", option_priority, fname))
451 strlcpy(passwd, p, sizeof(passwd));
458 * privgroup - allow members of the group to have privileged access.
469 option_error("group %s is unknown", *argv);
472 for (i = 0; i < ngroups; ++i) {
473 if (groups[i] == g->gr_gid) {
483 * set_noauth_addr - set address(es) that can be used without authentication.
484 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
487 set_noauth_addr(argv)
491 int l = strlen(addr) + 1;
494 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
496 novm("allow-ip argument");
497 wp->word = (char *) (wp + 1);
498 wp->next = noauth_addrs;
499 BCOPY(addr, wp->word, l);
506 * set_permitted_number - set remote telephone number(s) that may connect.
509 set_permitted_number(argv)
512 char *number = *argv;
513 int l = strlen(number) + 1;
516 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
518 novm("allow-number argument");
519 wp->word = (char *) (wp + 1);
520 wp->next = permitted_numbers;
521 BCOPY(number, wp->word, l);
522 permitted_numbers = wp;
528 * An Open on LCP has requested a change from Dead to Establish phase.
529 * Do what's necessary to bring the physical layer up.
537 new_phase(PHASE_SERIALCONN);
539 devfd = the_channel->connect();
540 msg = "Connect script failed";
544 /* set up the serial device as a ppp interface */
546 * N.B. we used to do tdb_writelock/tdb_writeunlock around this
547 * (from establish_ppp to set_ifunit). However, we won't be
548 * doing the set_ifunit in multilink mode, which is the only time
549 * we need the atomicity that the tdb_writelock/tdb_writeunlock
550 * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock.
552 fd_ppp = the_channel->establish_ppp(devfd);
553 msg = "ppp establishment failed";
555 status = EXIT_FATAL_ERROR;
559 if (!demand && ifunit >= 0)
563 * Start opening the connection and wait for
564 * incoming events (reply, timeout, etc.).
567 notice("Connect: %s <--> %s", ifname, ppp_devnam);
569 notice("Starting negotiation on %s", ppp_devnam);
572 status = EXIT_NEGOTIATION_FAILED;
573 new_phase(PHASE_ESTABLISH);
579 new_phase(PHASE_DISCONNECT);
580 if (the_channel->disconnect)
581 the_channel->disconnect();
584 new_phase(PHASE_DEAD);
585 if (the_channel->cleanup)
586 (*the_channel->cleanup)();
590 * LCP has terminated the link; go to the Dead phase and take the
591 * physical layer down.
594 link_terminated(unit)
597 if (phase == PHASE_DEAD || phase == PHASE_MASTER)
599 new_phase(PHASE_DISCONNECT);
601 if (pap_logout_hook) {
608 if (!doing_multilink) {
609 notice("Connection terminated.");
612 notice("Link terminated.");
615 * Delete pid files before disestablishing ppp. Otherwise it
616 * can happen that another pppd gets the same unit and then
617 * we delete its pid file.
619 if (!doing_multilink && !demand)
623 * If we may want to bring the link up again, transfer
624 * the ppp unit back to the loopback. Set the
625 * real serial device back to its normal mode of operation.
630 the_channel->disestablish_ppp(devfd);
637 if (!doing_multilink && !demand)
638 script_unsetenv("IFNAME");
641 * Run disconnector script, if requested.
642 * XXX we may not be able to do this if the line has hung up!
644 if (devfd >= 0 && the_channel->disconnect) {
645 the_channel->disconnect();
649 if (doing_multilink && multilink_master) {
650 if (!bundle_terminating)
651 new_phase(PHASE_MASTER);
653 mp_bundle_terminated();
655 new_phase(PHASE_DEAD);
659 * LCP has gone down; it will either die or try to re-establish.
665 if (auth_state != s_down) {
666 notify(link_down_notifier, 0);
668 if (auth_script_state == s_up && auth_script_pid == 0) {
669 update_link_stats(unit);
670 auth_script_state = s_down;
671 auth_script(_PATH_AUTHDOWN);
674 if (!doing_multilink) {
675 upper_layers_down(unit);
676 if (phase != PHASE_DEAD && phase != PHASE_MASTER)
677 new_phase(PHASE_ESTABLISH);
679 /* XXX if doing_multilink, should do something to stop
680 network-layer traffic on the link */
683 void upper_layers_down(int unit)
686 struct protent *protp;
688 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
689 if (!protp->enabled_flag)
691 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
692 (*protp->lowerdown)(unit);
693 if (protp->protocol < 0xC000 && protp->close != NULL)
694 (*protp->close)(unit, "LCP down");
701 * The link is established.
702 * Proceed to the Dead, Authenticate or Network phase as appropriate.
705 link_established(unit)
709 lcp_options *wo = &lcp_wantoptions[unit];
710 lcp_options *go = &lcp_gotoptions[unit];
711 lcp_options *ho = &lcp_hisoptions[unit];
713 struct protent *protp;
716 * Tell higher-level protocols that LCP is up.
718 if (!doing_multilink) {
719 for (i = 0; (protp = protocols[i]) != NULL; ++i)
720 if (protp->protocol != PPP_LCP && protp->enabled_flag
721 && protp->lowerup != NULL)
722 (*protp->lowerup)(unit);
725 if (!auth_required && noauth_addrs != NULL)
726 set_allowed_addrs(unit, NULL, NULL);
728 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) {
730 * We wanted the peer to authenticate itself, and it refused:
731 * if we have some address(es) it can use without auth, fine,
732 * otherwise treat it as though it authenticated with PAP using
733 * a username of "" and a password of "". If that's not OK,
736 if (noauth_addrs != NULL) {
737 set_allowed_addrs(unit, NULL, NULL);
738 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
739 warn("peer refused to authenticate: terminating link");
740 lcp_close(unit, "peer refused to authenticate");
741 status = EXIT_PEER_AUTH_FAILED;
746 new_phase(PHASE_AUTHENTICATE);
750 eap_authpeer(unit, our_name);
752 } else if (go->neg_chap) {
753 chap_auth_peer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
755 } else if (go->neg_upap) {
760 eap_authwithpeer(unit, user);
761 auth |= EAP_WITHPEER;
762 } else if (ho->neg_chap) {
763 chap_auth_with_peer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
764 auth |= CHAP_WITHPEER;
765 } else if (ho->neg_upap) {
766 if (passwd[0] == 0) {
767 passwd_from_file = 1;
768 if (!get_pap_passwd(passwd))
769 error("No secret found for PAP login");
771 upap_authwithpeer(unit, user, passwd);
772 auth |= PAP_WITHPEER;
774 auth_pending[unit] = auth;
782 * Proceed to the network phase.
788 lcp_options *go = &lcp_gotoptions[unit];
790 /* Log calling number. */
792 notice("peer from calling number %q authorized", remote_number);
795 * If the peer had to authenticate, run the auth-up script now.
797 if (go->neg_chap || go->neg_upap || go->neg_eap) {
798 notify(auth_up_notifier, 0);
800 if (auth_script_state == s_down && auth_script_pid == 0) {
801 auth_script_state = s_up;
802 auth_script(_PATH_AUTHUP);
808 * If we negotiated callback, do it now.
811 new_phase(PHASE_CALLBACK);
812 (*cbcp_protent.open)(unit);
818 * Process extra options from the secrets file
821 options_from_list(extra_options, 1);
822 free_wordlist(extra_options);
825 start_networks(unit);
833 struct protent *protp;
834 int ecp_required, mppe_required;
836 new_phase(PHASE_NETWORK);
838 #ifdef HAVE_MULTILINK
840 if (mp_join_bundle()) {
841 if (updetach && !nodetach)
846 #endif /* HAVE_MULTILINK */
850 set_filters(&pass_filter, &active_filter);
852 /* Start CCP and ECP */
853 for (i = 0; (protp = protocols[i]) != NULL; ++i)
854 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
855 && protp->enabled_flag && protp->open != NULL)
859 * Bring up other network protocols iff encryption is not required.
861 ecp_required = ecp_gotoptions[unit].required;
862 mppe_required = ccp_gotoptions[unit].mppe;
863 if (!ecp_required && !mppe_required)
864 continue_networks(unit);
868 continue_networks(unit)
872 struct protent *protp;
875 * Start the "real" network protocols.
877 for (i = 0; (protp = protocols[i]) != NULL; ++i)
878 if (protp->protocol < 0xC000
879 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
880 && protp->enabled_flag && protp->open != NULL) {
885 if (num_np_open == 0)
887 lcp_close(0, "No network protocols running");
891 * The peer has failed to authenticate himself using `protocol'.
894 auth_peer_fail(unit, protocol)
898 * Authentication failure: take the link down
900 lcp_close(unit, "Authentication failed");
901 status = EXIT_PEER_AUTH_FAILED;
905 * The peer has been successfully authenticated using `protocol'.
908 auth_peer_success(unit, protocol, prot_flavor, name, namelen)
909 int unit, protocol, prot_flavor;
918 switch (prot_flavor) {
920 bit |= CHAP_MD5_PEER;
926 case CHAP_MICROSOFT_V2:
927 bit |= CHAP_MS2_PEER;
939 warn("auth_peer_success: unknown protocol %x", protocol);
944 * Save the authenticated name of the peer for later.
946 if (namelen > sizeof(peer_authname) - 1)
947 namelen = sizeof(peer_authname) - 1;
948 BCOPY(name, peer_authname, namelen);
949 peer_authname[namelen] = 0;
950 script_setenv("PEERNAME", peer_authname, 0);
952 /* Save the authentication method for later. */
953 auth_done[unit] |= bit;
956 * If there is no more authentication still to be done,
957 * proceed to the network (or callback) phase.
959 if ((auth_pending[unit] &= ~bit) == 0)
964 * We have failed to authenticate ourselves to the peer using `protocol'.
967 auth_withpeer_fail(unit, protocol)
970 if (passwd_from_file)
971 BZERO(passwd, MAXSECRETLEN);
973 * We've failed to authenticate ourselves to our peer.
974 * Some servers keep sending CHAP challenges, but there
975 * is no point in persisting without any way to get updated
976 * authentication secrets.
978 lcp_close(unit, "Failed to authenticate ourselves to peer");
979 status = EXIT_AUTH_TOPEER_FAILED;
983 * We have successfully authenticated ourselves with the peer using `protocol'.
986 auth_withpeer_success(unit, protocol, prot_flavor)
987 int unit, protocol, prot_flavor;
994 switch (prot_flavor) {
996 bit |= CHAP_MD5_WITHPEER;
1000 bit |= CHAP_MS_WITHPEER;
1002 case CHAP_MICROSOFT_V2:
1003 bit |= CHAP_MS2_WITHPEER;
1009 if (passwd_from_file)
1010 BZERO(passwd, MAXSECRETLEN);
1017 warn("auth_withpeer_success: unknown protocol %x", protocol);
1021 /* Save the authentication method for later. */
1022 auth_done[unit] |= bit;
1025 * If there is no more authentication still being done,
1026 * proceed to the network (or callback) phase.
1028 if ((auth_pending[unit] &= ~bit) == 0)
1029 network_phase(unit);
1034 * np_up - a network protocol has come up.
1042 if (num_np_up == 0) {
1044 * At this point we consider that the link has come up successfully.
1048 new_phase(PHASE_RUNNING);
1050 if (idle_time_hook != 0)
1051 tlim = (*idle_time_hook)(NULL);
1053 tlim = idle_time_limit;
1055 TIMEOUT(check_idle, NULL, tlim);
1058 * Set a timeout to close the connection once the maximum
1059 * connect time has expired.
1062 TIMEOUT(connect_time_expired, 0, maxconnect);
1066 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1070 * Detach now, if the updetach option was given.
1072 if (updetach && !nodetach)
1079 * np_down - a network protocol has gone down.
1082 np_down(unit, proto)
1085 if (--num_np_up == 0) {
1086 UNTIMEOUT(check_idle, NULL);
1087 UNTIMEOUT(connect_time_expired, NULL);
1089 UNTIMEOUT(check_maxoctets, NULL);
1091 new_phase(PHASE_NETWORK);
1096 * np_finished - a network protocol has finished using the link.
1099 np_finished(unit, proto)
1102 if (--num_np_open <= 0) {
1103 /* no further use for the link: shut up shop. */
1104 lcp_close(0, "No network protocols running");
1110 check_maxoctets(arg)
1116 update_link_stats(ifunit);
1119 switch(maxoctets_dir) {
1120 case PPP_OCTETS_DIRECTION_IN:
1121 used = link_stats.bytes_in;
1123 case PPP_OCTETS_DIRECTION_OUT:
1124 used = link_stats.bytes_out;
1126 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1127 case PPP_OCTETS_DIRECTION_MAXSESSION:
1128 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1131 used = link_stats.bytes_in+link_stats.bytes_out;
1134 diff = maxoctets - used;
1136 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1137 lcp_close(0, "Traffic limit");
1139 status = EXIT_TRAFFIC_LIMIT;
1141 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1147 * check_idle - check whether the link has been idle for long
1148 * enough that we can shut it down.
1154 struct ppp_idle idle;
1158 if (!get_idle_time(0, &idle))
1160 if (idle_time_hook != 0) {
1161 tlim = idle_time_hook(&idle);
1163 itime = MIN(idle.xmit_idle, idle.recv_idle);
1164 tlim = idle_time_limit - itime;
1167 /* link is idle: shut it down. */
1168 notice("Terminating connection due to lack of activity.");
1169 lcp_close(0, "Link inactive");
1171 status = EXIT_IDLE_TIMEOUT;
1173 TIMEOUT(check_idle, NULL, tlim);
1178 * connect_time_expired - log a message and close the connection.
1181 connect_time_expired(arg)
1184 info("Connect time expired");
1185 status = EXIT_CONNECT_TIME;
1186 lcp_close(0, "Connect time expired"); /* Close connection */
1190 * auth_check_options - called to check authentication options.
1193 auth_check_options()
1195 lcp_options *wo = &lcp_wantoptions[0];
1199 /* Default our_name to hostname, and user to our_name */
1200 if (our_name[0] == 0 || usehostname)
1201 strlcpy(our_name, hostname, sizeof(our_name));
1203 strlcpy(user, our_name, sizeof(user));
1206 * If we have a default route, require the peer to authenticate
1207 * unless the noauth option was given or the real user is root.
1209 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1214 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1215 if (wo->chap_mdtype)
1218 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1219 if (auth_required) {
1221 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) {
1222 wo->neg_chap = chap_mdtype_all != MDTYPE_NONE;
1223 wo->chap_mdtype = chap_mdtype_all;
1229 wo->chap_mdtype = MDTYPE_NONE;
1235 * Check whether we have appropriate secrets to use
1236 * to authenticate the peer. Note that EAP can authenticate by way
1237 * of a CHAP-like exchanges as well as SRP.
1240 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1241 if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
1242 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1243 our_name, 1, &lacks_ip);
1245 if (!can_auth && wo->neg_eap) {
1246 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1247 our_name, 1, &lacks_ip);
1250 if (auth_required && !can_auth && noauth_addrs == NULL) {
1253 "By default the remote system is required to authenticate itself");
1255 "(because this system has a default route to the internet)");
1256 } else if (explicit_remote)
1258 "The remote system (%s) is required to authenticate itself",
1262 "The remote system is required to authenticate itself");
1264 "but I couldn't find any suitable secret (password) for it to use to do so.");
1267 "(None of the available passwords would let it use an IP address.)");
1273 * Early check for remote number authorization.
1275 if (!auth_number()) {
1276 warn("calling number %q is not authorized", remote_number);
1277 exit(EXIT_CNID_AUTH_FAILED);
1282 * auth_reset - called when LCP is starting negotiations to recheck
1283 * authentication options, i.e. whether we have appropriate secrets
1284 * to use for authenticating ourselves and/or the peer.
1290 lcp_options *go = &lcp_gotoptions[unit];
1291 lcp_options *ao = &lcp_allowoptions[unit];
1295 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1296 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1297 && (passwd[0] != 0 ||
1298 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1300 ao->neg_eap = !refuse_eap && (
1302 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1303 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1304 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL));
1307 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1310 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1311 our_name, 1, NULL)))
1315 (hadchap == 0 || (hadchap == -1 &&
1316 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1318 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1325 * check_passwd - Check the user name and passwd against the PAP secrets
1326 * file. If requested, also check against the system password database,
1327 * and login the user if OK.
1330 * UPAP_AUTHNAK: Authentication failed.
1331 * UPAP_AUTHACK: Authentication succeeded.
1332 * In either case, msg points to an appropriate message.
1335 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
1346 struct wordlist *addrs = NULL, *opts = NULL;
1347 char passwd[256], user[256];
1348 char secret[MAXWORDLEN];
1349 static int attempts = 0;
1352 * Make copies of apasswd and auser, then null-terminate them.
1353 * If there are unprintable characters in the password, make
1356 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1357 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1361 * Check if a plugin wants to handle this.
1363 if (pap_auth_hook) {
1364 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1366 /* note: set_allowed_addrs() saves opts (but not addrs):
1369 set_allowed_addrs(unit, addrs, opts);
1371 free_wordlist(opts);
1373 free_wordlist(addrs);
1374 BZERO(passwd, sizeof(passwd));
1375 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1380 * Open the file of pap secrets and scan for a suitable secret
1381 * for authenticating this user.
1383 filename = _PATH_UPAPFILE;
1384 addrs = opts = NULL;
1386 f = fopen(filename, "r");
1388 error("Can't open PAP password file %s: %m", filename);
1391 check_access(f, filename);
1392 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1393 warn("no PAP secret found for %s", user);
1396 * If the secret is "@login", it means to check
1397 * the password against the login database.
1399 int login_secret = strcmp(secret, "@login") == 0;
1401 if (uselogin || login_secret) {
1402 /* login option or secret is @login */
1403 if ((ret = plogin(user, passwd, msg)) == UPAP_AUTHACK)
1406 if (secret[0] != 0 && !login_secret) {
1407 /* password given in pap-secrets - must match */
1408 if ((cryptpap || strcmp(passwd, secret) != 0)
1409 && strcmp(crypt(passwd, secret), secret) != 0)
1416 if (ret == UPAP_AUTHNAK) {
1418 *msg = "Login incorrect";
1420 * XXX can we ever get here more than once??
1421 * Frustrate passwd stealer programs.
1422 * Allow 10 tries, but start backing off after 3 (stolen from login).
1423 * On 10'th, drop the connection.
1425 if (attempts++ >= 10) {
1426 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1427 lcp_close(unit, "login failed");
1430 sleep((u_int) (attempts - 3) * 5);
1432 free_wordlist(opts);
1435 attempts = 0; /* Reset count */
1438 set_allowed_addrs(unit, addrs, opts);
1442 free_wordlist(addrs);
1443 BZERO(passwd, sizeof(passwd));
1444 BZERO(secret, sizeof(secret));
1450 * This function is needed for PAM.
1454 /* Static variables used to communicate between the conversation function
1455 * and the server_login function
1457 static char *PAM_username;
1458 static char *PAM_password;
1459 static int PAM_error = 0;
1460 static pam_handle_t *pamh = NULL;
1462 /* PAM conversation function
1463 * Here we assume (for now, at least) that echo on means login name, and
1464 * echo off means password.
1467 static int PAM_conv (int num_msg,
1471 struct pam_message **msg,
1472 struct pam_response **resp, void *appdata_ptr)
1475 struct pam_response *reply = NULL;
1477 #define COPY_STRING(s) (s) ? strdup(s) : NULL
1479 reply = malloc(sizeof(struct pam_response) * num_msg);
1480 if (!reply) return PAM_CONV_ERR;
1482 for (replies = 0; replies < num_msg; replies++) {
1483 switch (msg[replies]->msg_style) {
1484 case PAM_PROMPT_ECHO_ON:
1485 reply[replies].resp_retcode = PAM_SUCCESS;
1486 reply[replies].resp = COPY_STRING(PAM_username);
1487 /* PAM frees resp */
1489 case PAM_PROMPT_ECHO_OFF:
1490 reply[replies].resp_retcode = PAM_SUCCESS;
1491 reply[replies].resp = COPY_STRING(PAM_password);
1492 /* PAM frees resp */
1497 /* ignore it, but pam still wants a NULL response... */
1498 reply[replies].resp_retcode = PAM_SUCCESS;
1499 reply[replies].resp = NULL;
1502 /* Must be an error of some sort... */
1505 return PAM_CONV_ERR;
1512 static struct pam_conv PAM_conversation = {
1516 #endif /* USE_PAM */
1519 * plogin - Check the user name and password against the system
1520 * password database, and login the user if OK.
1523 * UPAP_AUTHNAK: Login failed.
1524 * UPAP_AUTHACK: Login succeeded.
1525 * In either case, msg points to an appropriate message.
1529 plogin(user, passwd, msg)
1539 pam_error = pam_start ("ppp", user, &PAM_conversation, &pamh);
1540 if (pam_error != PAM_SUCCESS) {
1541 *msg = (char *) pam_strerror (pamh, pam_error);
1543 return UPAP_AUTHNAK;
1546 * Define the fields for the credential validation
1549 PAM_username = user;
1550 PAM_password = passwd;
1552 pam_set_item (pamh, PAM_TTY, devnam); /* this might be useful to some modules */
1557 pam_error = pam_authenticate (pamh, PAM_SILENT);
1558 if (pam_error == PAM_SUCCESS && !PAM_error) {
1559 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
1560 if (pam_error == PAM_SUCCESS)
1561 pam_error = pam_open_session (pamh, PAM_SILENT);
1564 *msg = (char *) pam_strerror (pamh, pam_error);
1569 reopen_log(); /* apparently the PAM stuff does closelog() */
1570 PAM_username = NULL;
1571 PAM_password = NULL;
1572 if (pam_error != PAM_SUCCESS)
1573 return UPAP_AUTHNAK;
1574 #else /* #ifdef USE_PAM */
1577 * Use the non-PAM methods directly
1582 struct spwd *getspnam();
1584 struct passwd *pw = getpwnam(user);
1588 return (UPAP_AUTHNAK);
1591 spwd = getspnam(user);
1594 /* check the age of the password entry */
1595 long now = time(NULL) / 86400L;
1597 if ((spwd->sp_expire > 0 && now >= spwd->sp_expire)
1598 || ((spwd->sp_max >= 0 && spwd->sp_max < 10000)
1599 && spwd->sp_lstchg >= 0
1600 && now >= spwd->sp_lstchg + spwd->sp_max)) {
1601 warn("Password for %s has expired", user);
1602 return (UPAP_AUTHNAK);
1604 pw->pw_passwd = spwd->sp_pwdp;
1609 * If no passwd, don't let them login.
1611 if (pw->pw_passwd == NULL || strlen(pw->pw_passwd) < 2
1612 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
1613 return (UPAP_AUTHNAK);
1615 #endif /* #ifdef USE_PAM */
1618 * Write a wtmp entry for this user.
1622 if (strncmp(tty, "/dev/", 5) == 0)
1624 logwtmp(tty, user, ifname); /* Add wtmp login entry */
1626 #if defined(_PATH_LASTLOG) && !defined(USE_PAM)
1627 if (pw != (struct passwd *)NULL) {
1631 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1632 (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
1633 memset((void *)&ll, 0, sizeof(ll));
1634 (void)time(&ll.ll_time);
1635 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
1636 (void)write(fd, (char *)&ll, sizeof(ll));
1640 #endif /* _PATH_LASTLOG and not USE_PAM */
1642 info("user %s logged in", user);
1645 return (UPAP_AUTHACK);
1649 * plogout - Logout the user.
1658 pam_error = pam_close_session (pamh, PAM_SILENT);
1659 pam_end (pamh, pam_error);
1662 /* Apparently the pam stuff does closelog(). */
1664 #else /* ! USE_PAM */
1668 if (strncmp(tty, "/dev/", 5) == 0)
1670 logwtmp(tty, "", ""); /* Wipe out utmp logout entry */
1671 #endif /* ! USE_PAM */
1677 * null_login - Check if a username of "" and a password of "" are
1678 * acceptable, and iff so, set the list of acceptable IP addresses
1688 struct wordlist *addrs, *opts;
1689 char secret[MAXWORDLEN];
1692 * Check if a plugin wants to handle this.
1696 ret = (*null_auth_hook)(&addrs, &opts);
1699 * Open the file of pap secrets and scan for a suitable secret.
1702 filename = _PATH_UPAPFILE;
1704 f = fopen(filename, "r");
1707 check_access(f, filename);
1709 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1710 ret = i >= 0 && secret[0] == 0;
1711 BZERO(secret, sizeof(secret));
1716 set_allowed_addrs(unit, addrs, opts);
1718 free_wordlist(opts);
1720 free_wordlist(addrs);
1727 * get_pap_passwd - get a password for authenticating ourselves with
1728 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1730 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1733 get_pap_passwd(passwd)
1739 char secret[MAXWORDLEN];
1742 * Check whether a plugin wants to supply this.
1744 if (pap_passwd_hook) {
1745 ret = (*pap_passwd_hook)(user, passwd);
1750 filename = _PATH_UPAPFILE;
1751 f = fopen(filename, "r");
1754 check_access(f, filename);
1755 ret = scan_authfile(f, user,
1756 (remote_name[0]? remote_name: NULL),
1757 secret, NULL, NULL, filename, 0);
1762 strlcpy(passwd, secret, MAXSECRETLEN);
1763 BZERO(secret, sizeof(secret));
1769 * have_pap_secret - check whether we have a PAP file with any
1770 * secrets that we could possibly use for authenticating the peer.
1773 have_pap_secret(lacks_ipp)
1779 struct wordlist *addrs;
1781 /* let the plugin decide, if there is one */
1782 if (pap_check_hook) {
1783 ret = (*pap_check_hook)();
1788 filename = _PATH_UPAPFILE;
1789 f = fopen(filename, "r");
1793 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1794 NULL, &addrs, NULL, filename, 0);
1796 if (ret >= 0 && !some_ip_ok(addrs)) {
1802 free_wordlist(addrs);
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.
1815 have_chap_secret(client, server, need_ip, lacks_ipp)
1824 struct wordlist *addrs;
1826 if (chap_check_hook) {
1827 ret = (*chap_check_hook)();
1833 filename = _PATH_CHAPFILE;
1834 f = fopen(filename, "r");
1838 if (client != NULL && client[0] == 0)
1840 else if (server != NULL && server[0] == 0)
1843 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1845 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1851 free_wordlist(addrs);
1858 * have_srp_secret - check whether we have a SRP file with a
1859 * secret that we could possibly use for authenticating `client'
1860 * on `server'. Either can be the null string, meaning we don't
1861 * know the identity yet.
1864 have_srp_secret(client, server, need_ip, lacks_ipp)
1873 struct wordlist *addrs;
1875 filename = _PATH_SRPFILE;
1876 f = fopen(filename, "r");
1880 if (client != NULL && client[0] == 0)
1882 else if (server != NULL && server[0] == 0)
1885 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1887 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1893 free_wordlist(addrs);
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).
1905 get_secret(unit, client, server, secret, secret_len, am_server)
1916 struct wordlist *addrs, *opts;
1917 char secbuf[MAXWORDLEN];
1919 if (!am_server && passwd[0] != 0) {
1920 strlcpy(secbuf, passwd, sizeof(secbuf));
1921 } else if (!am_server && chap_passwd_hook) {
1922 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1923 error("Unable to obtain CHAP password for %s on %s from plugin",
1928 filename = _PATH_CHAPFILE;
1932 f = fopen(filename, "r");
1934 error("Can't open chap secret file %s: %m", filename);
1937 check_access(f, filename);
1939 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1945 set_allowed_addrs(unit, addrs, opts);
1947 free_wordlist(opts);
1949 free_wordlist(addrs);
1952 len = strlen(secbuf);
1953 if (len > MAXSECRETLEN) {
1954 error("Secret for %s on %s is too long", client, server);
1957 BCOPY(secbuf, secret, len);
1958 BZERO(secbuf, sizeof(secbuf));
1966 * get_srp_secret - open the SRP secret file and return the secret
1967 * for authenticating the given client on the given server.
1968 * (We could be either client or server).
1971 get_srp_secret(unit, client, server, secret, am_server)
1981 struct wordlist *addrs, *opts;
1983 if (!am_server && passwd[0] != '\0') {
1984 strlcpy(secret, passwd, MAXWORDLEN);
1986 filename = _PATH_SRPFILE;
1989 fp = fopen(filename, "r");
1991 error("Can't open srp secret file %s: %m", filename);
1994 check_access(fp, filename);
1997 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
1998 filename, am_server);
2004 set_allowed_addrs(unit, addrs, opts);
2005 else if (opts != NULL)
2006 free_wordlist(opts);
2008 free_wordlist(addrs);
2015 * set_allowed_addrs() - set the list of allowed addresses.
2016 * Also looks for `--' indicating options to apply for this peer
2017 * and leaves the following words in extra_options.
2020 set_allowed_addrs(unit, addrs, opts)
2022 struct wordlist *addrs;
2023 struct wordlist *opts;
2026 struct wordlist *ap, **plink;
2027 struct permitted_ip *ip;
2028 char *ptr_word, *ptr_mask;
2031 u_int32_t a, mask, ah, offset;
2032 struct ipcp_options *wo = &ipcp_wantoptions[unit];
2033 u_int32_t suggested_ip = 0;
2035 if (addresses[unit] != NULL)
2036 free(addresses[unit]);
2037 addresses[unit] = NULL;
2038 if (extra_options != NULL)
2039 free_wordlist(extra_options);
2040 extra_options = opts;
2043 * Count the number of IP addresses given.
2045 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
2048 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
2052 /* temporarily append the noauth_addrs list to addrs */
2053 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
2055 *plink = noauth_addrs;
2058 for (ap = addrs; ap != NULL; ap = ap->next) {
2059 /* "-" means no addresses authorized, "*" means any address allowed */
2060 ptr_word = ap->word;
2061 if (strcmp(ptr_word, "-") == 0)
2063 if (strcmp(ptr_word, "*") == 0) {
2065 ip[n].base = ip[n].mask = 0;
2071 if (*ptr_word == '!') {
2076 mask = ~ (u_int32_t) 0;
2078 ptr_mask = strchr (ptr_word, '/');
2079 if (ptr_mask != NULL) {
2083 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
2084 if (bit_count <= 0 || bit_count > 32) {
2085 warn("invalid address length %v in auth. address list",
2089 bit_count = 32 - bit_count; /* # bits in host part */
2091 offset = ifunit + 1;
2095 warn("invalid address length syntax: %v", ptr_mask+1);
2102 hp = gethostbyname(ptr_word);
2103 if (hp != NULL && hp->h_addrtype == AF_INET) {
2104 a = *(u_int32_t *)hp->h_addr;
2106 np = getnetbyname (ptr_word);
2107 if (np != NULL && np->n_addrtype == AF_INET) {
2108 a = htonl ((u_int32_t)np->n_net);
2109 if (ptr_mask == NULL) {
2110 /* calculate appropriate mask for net */
2113 mask = IN_CLASSA_NET;
2114 else if (IN_CLASSB(ah))
2115 mask = IN_CLASSB_NET;
2116 else if (IN_CLASSC(ah))
2117 mask = IN_CLASSC_NET;
2120 a = inet_addr (ptr_word);
2124 if (ptr_mask != NULL)
2127 if (a == (u_int32_t)-1L) {
2128 warn("unknown host %s in auth. address list", ap->word);
2132 if (offset >= ~mask) {
2133 warn("interface unit %d too large for subnet %v",
2137 a = htonl((ntohl(a) & mask) + offset);
2138 mask = ~(u_int32_t)0;
2140 ip[n].mask = htonl(mask);
2141 ip[n].base = a & ip[n].mask;
2143 if (~mask == 0 && suggested_ip == 0)
2148 ip[n].permit = 0; /* make the last entry forbid all addresses */
2149 ip[n].base = 0; /* to terminate the list */
2152 addresses[unit] = ip;
2155 * If the address given for the peer isn't authorized, or if
2156 * the user hasn't given one, AND there is an authorized address
2157 * which is a single host, then use that if we find one.
2159 if (suggested_ip != 0
2160 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2161 wo->hisaddr = suggested_ip;
2163 * Do we insist on this address? No, if there are other
2164 * addresses authorized than the suggested one.
2167 wo->accept_remote = 1;
2172 * auth_ip_addr - check whether the peer is authorized to use
2173 * a given IP address. Returns 1 if authorized, 0 otherwise.
2176 auth_ip_addr(unit, addr)
2182 /* don't allow loopback or multicast address */
2183 if (bad_ip_adrs(addr))
2186 if (allowed_address_hook) {
2187 ok = allowed_address_hook(addr);
2188 if (ok >= 0) return ok;
2191 if (addresses[unit] != NULL) {
2192 ok = ip_addr_check(addr, addresses[unit]);
2198 return 0; /* no addresses authorized */
2199 return allow_any_ip || privileged || !have_route_to(addr);
2203 ip_addr_check(addr, addrs)
2205 struct permitted_ip *addrs;
2208 if ((addr & addrs->mask) == addrs->base)
2209 return addrs->permit;
2213 * bad_ip_adrs - return 1 if the IP address is one we don't want
2214 * to use, such as an address in the loopback net or a multicast address.
2215 * addr is in network byte order.
2222 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2223 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2227 * some_ip_ok - check a wordlist to see if it authorizes any
2232 struct wordlist *addrs;
2234 for (; addrs != 0; addrs = addrs->next) {
2235 if (addrs->word[0] == '-')
2237 if (addrs->word[0] != '!')
2238 return 1; /* some IP address is allowed */
2244 * auth_number - check whether the remote number is allowed to connect.
2245 * Returns 1 if authorized, 0 otherwise.
2250 struct wordlist *wp = permitted_numbers;
2253 /* Allow all if no authorization list. */
2257 /* Allow if we have a match in the authorization list. */
2259 /* trailing '*' wildcard */
2260 l = strlen(wp->word);
2261 if ((wp->word)[l - 1] == '*')
2263 if (!strncasecmp(wp->word, remote_number, l))
2272 * check_access - complain if a secret file has too-liberal permissions.
2275 check_access(f, filename)
2281 if (fstat(fileno(f), &sbuf) < 0) {
2282 warn("cannot stat secret file %s: %m", filename);
2283 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2284 warn("Warning - secret file %s has world and/or group access",
2291 * scan_authfile - Scan an authorization file for a secret suitable
2292 * for authenticating `client' on `server'. The return value is -1
2293 * if no secret is found, otherwise >= 0. The return value has
2294 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2295 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2296 * Any following words on the line up to a "--" (i.e. address authorization
2297 * info) are placed in a wordlist and returned in *addrs. Any
2298 * following words (extra options) are placed in a wordlist and
2299 * returned in *opts.
2300 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2301 * Flags are non-zero if we need two colons in the secret in order to
2305 scan_authfile(f, client, server, secret, addrs, opts, filename, flags)
2310 struct wordlist **addrs;
2311 struct wordlist **opts;
2316 int got_flag, best_flag;
2318 struct wordlist *ap, *addr_list, *alist, **app;
2319 char word[MAXWORDLEN];
2320 char atfile[MAXWORDLEN];
2321 char lsecret[MAXWORDLEN];
2329 if (!getword(f, word, &newline, filename))
2330 return -1; /* file is empty??? */
2335 * Skip until we find a word at the start of a line.
2337 while (!newline && getword(f, word, &newline, filename))
2340 break; /* got to end of file */
2343 * Got a client - check if it's a match or a wildcard.
2346 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2351 got_flag = NONWILD_CLIENT;
2354 * Now get a server and check if it matches.
2356 if (!getword(f, word, &newline, filename))
2360 if (!ISWILD(word)) {
2361 if (server != NULL && strcmp(word, server) != 0)
2363 got_flag |= NONWILD_SERVER;
2367 * Got some sort of a match - see if it's better than what
2370 if (got_flag <= best_flag)
2376 if (!getword(f, word, &newline, filename))
2382 * SRP-SHA1 authenticator should never be reading secrets from
2383 * a file. (Authenticatee may, though.)
2385 if (flags && ((cp = strchr(word, ':')) == NULL ||
2386 strchr(cp + 1, ':') == NULL))
2389 if (secret != NULL) {
2391 * Special syntax: @/pathname means read secret from file.
2393 if (word[0] == '@' && word[1] == '/') {
2394 strlcpy(atfile, word+1, sizeof(atfile));
2395 if ((sf = fopen(atfile, "r")) == NULL) {
2396 warn("can't open indirect secret file %s", atfile);
2399 check_access(sf, atfile);
2400 if (!getword(sf, word, &xxx, atfile)) {
2401 warn("no secret in indirect secret file %s", atfile);
2407 strlcpy(lsecret, word, sizeof(lsecret));
2411 * Now read address authorization info and make a wordlist.
2415 if (!getword(f, word, &newline, filename) || newline)
2417 ap = (struct wordlist *)
2418 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2420 novm("authorized addresses");
2421 ap->word = (char *) (ap + 1);
2422 strcpy(ap->word, word);
2429 * This is the best so far; remember it.
2431 best_flag = got_flag;
2433 free_wordlist(addr_list);
2436 strlcpy(secret, lsecret, MAXWORDLEN);
2442 /* scan for a -- word indicating the start of options */
2443 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2444 if (strcmp(ap->word, "--") == 0)
2446 /* ap = start of options */
2448 ap = ap->next; /* first option */
2449 free(*app); /* free the "--" word */
2450 *app = NULL; /* terminate addr list */
2454 else if (ap != NULL)
2458 else if (addr_list != NULL)
2459 free_wordlist(addr_list);
2465 * wordlist_count - return the number of items in a wordlist
2469 struct wordlist *wp;
2473 for (n = 0; wp != NULL; wp = wp->next)
2479 * free_wordlist - release memory allocated for a wordlist.
2483 struct wordlist *wp;
2485 struct wordlist *next;
2487 while (wp != NULL) {
2495 * auth_script_done - called when the auth-up or auth-down script
2499 auth_script_done(arg)
2502 auth_script_pid = 0;
2503 switch (auth_script_state) {
2505 if (auth_state == s_down) {
2506 auth_script_state = s_down;
2507 auth_script(_PATH_AUTHDOWN);
2511 if (auth_state == s_up) {
2512 auth_script_state = s_up;
2513 auth_script(_PATH_AUTHUP);
2520 * auth_script - execute a script with arguments
2521 * interface-name peer-name real-user tty speed
2533 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2534 user_name = pw->pw_name;
2536 slprintf(struid, sizeof(struid), "%d", getuid());
2539 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2543 argv[2] = peer_authname;
2544 argv[3] = user_name;
2549 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);