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. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name(s) of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
22 * 4. Redistributions of any form whatsoever must retain the following
24 * "This product includes software developed by Paul Mackerras
25 * <paulus@samba.org>".
27 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
28 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
29 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
30 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
31 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
32 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
33 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
35 * Derived from main.c, which is:
37 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in
48 * the documentation and/or other materials provided with the
51 * 3. The name "Carnegie Mellon University" must not be used to
52 * endorse or promote products derived from this software without
53 * prior written permission. For permission or any legal
54 * details, please contact
55 * Office of Technology Transfer
56 * Carnegie Mellon University
58 * Pittsburgh, PA 15213-3890
59 * (412) 268-4387, fax: (412) 268-7395
60 * tech-transfer@andrew.cmu.edu
62 * 4. Redistributions of any form whatsoever must retain the following
64 * "This product includes software developed by Computing Services
65 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
67 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
68 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
69 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
70 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
71 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
72 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
73 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
76 #define RCSID "$Id: auth.c,v 1.94 2003/03/09 09:52:19 etbe Exp $"
85 #include <sys/types.h>
87 #include <sys/socket.h>
90 #if defined(_PATH_LASTLOG) && defined(__linux__)
95 #include <netinet/in.h>
96 #include <arpa/inet.h>
99 #include <security/pam_appl.h>
105 #define PW_PPP PW_LOGIN
122 #include "pathnames.h"
124 static const char rcsid[] = RCSID;
126 /* Bits in scan_authfile return value */
127 #define NONWILD_SERVER 1
128 #define NONWILD_CLIENT 2
130 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
132 /* The name by which the peer authenticated itself to us. */
133 char peer_authname[MAXNAMELEN];
135 /* Records which authentication operations haven't completed yet. */
136 static int auth_pending[NUM_PPP];
138 /* Records which authentication operations have been completed. */
139 int auth_done[NUM_PPP];
141 /* Set if we have successfully called plogin() */
142 static int logged_in;
144 /* List of addresses which the peer may use. */
145 static struct permitted_ip *addresses[NUM_PPP];
147 /* Wordlist giving addresses which the peer may use
148 without authenticating itself. */
149 static struct wordlist *noauth_addrs;
151 /* Remote telephone number, if available */
152 char remote_number[MAXNAMELEN];
154 /* Wordlist giving remote telephone numbers which may connect. */
155 static struct wordlist *permitted_numbers;
157 /* Extra options to apply, from the secrets file entry for the peer. */
158 static struct wordlist *extra_options;
160 /* Number of network protocols which we have opened. */
161 static int num_np_open;
163 /* Number of network protocols which have come up. */
164 static int num_np_up;
166 /* Set if we got the contents of passwd[] from the pap-secrets file. */
167 static int passwd_from_file;
169 /* Set if we require authentication only because we have a default route. */
170 static bool default_auth;
172 /* Hook to enable a plugin to control the idle time limit */
173 int (*idle_time_hook) __P((struct ppp_idle *)) = NULL;
175 /* Hook for a plugin to say whether we can possibly authenticate any peer */
176 int (*pap_check_hook) __P((void)) = NULL;
178 /* Hook for a plugin to check the PAP user and password */
179 int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
180 struct wordlist **paddrs,
181 struct wordlist **popts)) = NULL;
183 /* Hook for a plugin to know about the PAP user logout */
184 void (*pap_logout_hook) __P((void)) = NULL;
186 /* Hook for a plugin to get the PAP password for authenticating us */
187 int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL;
189 /* Hook for a plugin to say whether it is OK if the peer
190 refuses to authenticate. */
191 int (*null_auth_hook) __P((struct wordlist **paddrs,
192 struct wordlist **popts)) = NULL;
194 int (*allowed_address_hook) __P((u_int32_t addr)) = NULL;
196 /* A notifier for when the peer has authenticated itself,
197 and we are proceeding to the network phase. */
198 struct notifier *auth_up_notifier = NULL;
200 /* A notifier for when the link goes down. */
201 struct notifier *link_down_notifier = NULL;
204 * This is used to ensure that we don't start an auth-up/down
205 * script while one is already running.
212 static enum script_state auth_state = s_down;
213 static enum script_state auth_script_state = s_down;
214 static pid_t auth_script_pid = 0;
216 static int used_login; /* peer authenticated against login database */
221 bool uselogin = 0; /* Use /etc/passwd for checking PAP */
222 bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
223 bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
224 bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
225 bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */
227 bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */
228 bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */
230 bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */
231 bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */
233 bool usehostname = 0; /* Use hostname for our_name */
234 bool auth_required = 0; /* Always require authentication from peer */
235 bool allow_any_ip = 0; /* Allow peer to use any IP address */
236 bool explicit_remote = 0; /* User specified explicit remote name */
237 char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
239 static char *uafname; /* name of most recent +ua file */
241 extern char *crypt __P((const char *, const char *));
243 /* Prototypes for procedures local to this file. */
245 static void network_phase __P((int));
246 static void check_idle __P((void *));
247 static void connect_time_expired __P((void *));
248 static int plogin __P((char *, char *, char **));
249 static void plogout __P((void));
250 static int null_login __P((int));
251 static int get_pap_passwd __P((char *));
252 static int have_pap_secret __P((int *));
253 static int have_chap_secret __P((char *, char *, int, int *));
254 static int have_srp_secret __P((char *client, char *server, int need_ip,
256 static int ip_addr_check __P((u_int32_t, struct permitted_ip *));
257 static int scan_authfile __P((FILE *, char *, char *, char *,
258 struct wordlist **, struct wordlist **,
260 static void free_wordlist __P((struct wordlist *));
261 static void auth_script __P((char *));
262 static void auth_script_done __P((void *));
263 static void set_allowed_addrs __P((int, struct wordlist *, struct wordlist *));
264 static int some_ip_ok __P((struct wordlist *));
265 static int setupapfile __P((char **));
266 static int privgroup __P((char **));
267 static int set_noauth_addr __P((char **));
268 static int set_permitted_number __P((char **));
269 static void check_access __P((FILE *, char *));
270 static int wordlist_count __P((struct wordlist *));
273 static void check_maxoctets __P((void *));
277 * Authentication-related options.
279 option_t auth_options[] = {
280 { "auth", o_bool, &auth_required,
281 "Require authentication from peer", OPT_PRIO | 1 },
282 { "noauth", o_bool, &auth_required,
283 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
285 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
286 "Require PAP authentication from peer",
287 OPT_PRIOSUB | 1, &auth_required },
288 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
289 "Require PAP authentication from peer",
290 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
291 { "require-chap", o_bool, &auth_required,
292 "Require CHAP authentication from peer",
293 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
294 &lcp_wantoptions[0].chap_mdtype },
295 { "+chap", o_bool, &auth_required,
296 "Require CHAP authentication from peer",
297 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
298 &lcp_wantoptions[0].chap_mdtype },
300 { "require-mschap", o_bool, &auth_required,
301 "Require MS-CHAP authentication from peer",
302 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
303 &lcp_wantoptions[0].chap_mdtype },
304 { "+mschap", o_bool, &auth_required,
305 "Require MS-CHAP authentication from peer",
306 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
307 &lcp_wantoptions[0].chap_mdtype },
308 { "require-mschap-v2", o_bool, &auth_required,
309 "Require MS-CHAPv2 authentication from peer",
310 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
311 &lcp_wantoptions[0].chap_mdtype },
312 { "+mschap-v2", o_bool, &auth_required,
313 "Require MS-CHAPv2 authentication from peer",
314 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
315 &lcp_wantoptions[0].chap_mdtype },
318 { "refuse-pap", o_bool, &refuse_pap,
319 "Don't agree to auth to peer with PAP", 1 },
320 { "-pap", o_bool, &refuse_pap,
321 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
322 { "refuse-chap", o_bool, &refuse_chap,
323 "Don't agree to auth to peer with CHAP",
324 OPT_A2CLRB | MDTYPE_MD5,
325 &lcp_allowoptions[0].chap_mdtype },
326 { "-chap", o_bool, &refuse_chap,
327 "Don't allow CHAP authentication with peer",
328 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
329 &lcp_allowoptions[0].chap_mdtype },
331 { "refuse-mschap", o_bool, &refuse_mschap,
332 "Don't agree to auth to peer with MS-CHAP",
333 OPT_A2CLRB | MDTYPE_MICROSOFT,
334 &lcp_allowoptions[0].chap_mdtype },
335 { "-mschap", o_bool, &refuse_mschap,
336 "Don't allow MS-CHAP authentication with peer",
337 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
338 &lcp_allowoptions[0].chap_mdtype },
339 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
340 "Don't agree to auth to peer with MS-CHAPv2",
341 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
342 &lcp_allowoptions[0].chap_mdtype },
343 { "-mschap-v2", o_bool, &refuse_mschap_v2,
344 "Don't allow MS-CHAPv2 authentication with peer",
345 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
346 &lcp_allowoptions[0].chap_mdtype },
349 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
350 "Require EAP authentication from peer", OPT_PRIOSUB | 1,
352 { "refuse-eap", o_bool, &refuse_eap,
353 "Don't agree to authenticate to peer with EAP", 1 },
355 { "name", o_string, our_name,
356 "Set local name for authentication",
357 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
359 { "+ua", o_special, (void *)setupapfile,
360 "Get PAP user and password from file",
361 OPT_PRIO | OPT_A2STRVAL, &uafname },
363 { "user", o_string, user,
364 "Set name for auth with peer", OPT_PRIO | OPT_STATIC, NULL, MAXNAMELEN },
366 { "password", o_string, passwd,
367 "Password for authenticating us to the peer",
368 OPT_PRIO | OPT_STATIC | OPT_HIDE, NULL, MAXSECRETLEN },
370 { "usehostname", o_bool, &usehostname,
371 "Must use hostname for authentication", 1 },
373 { "remotename", o_string, remote_name,
374 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
375 &explicit_remote, MAXNAMELEN },
377 { "login", o_bool, &uselogin,
378 "Use system password database for PAP", 1 },
380 { "papcrypt", o_bool, &cryptpap,
381 "PAP passwords are encrypted", 1 },
383 { "privgroup", o_special, (void *)privgroup,
384 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
386 { "allow-ip", o_special, (void *)set_noauth_addr,
387 "Set IP address(es) which can be used without authentication",
388 OPT_PRIV | OPT_A2LIST },
390 { "remotenumber", o_string, remote_number,
391 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
394 { "allow-number", o_special, (void *)set_permitted_number,
395 "Set telephone number(s) which are allowed to connect",
396 OPT_PRIV | OPT_A2LIST },
402 * setupapfile - specifies UPAP info for authenticating with peer.
410 char u[MAXNAMELEN], p[MAXSECRETLEN];
413 lcp_allowoptions[0].neg_upap = 1;
415 /* open user info file */
416 fname = strdup(*argv);
418 novm("+ua file name");
420 ufile = fopen(fname, "r");
423 option_error("unable to open user login data file %s", fname);
426 check_access(ufile, fname);
430 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
431 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
433 option_error("unable to read user login data file %s", fname);
438 /* get rid of newlines */
440 if (l > 0 && u[l-1] == '\n')
443 if (l > 0 && p[l-1] == '\n')
446 if (override_value("user", option_priority, fname))
447 strlcpy(user, u, sizeof(user));
448 if (override_value("passwd", option_priority, fname))
449 strlcpy(passwd, p, sizeof(passwd));
456 * privgroup - allow members of the group to have privileged access.
467 option_error("group %s is unknown", *argv);
470 for (i = 0; i < ngroups; ++i) {
471 if (groups[i] == g->gr_gid) {
481 * set_noauth_addr - set address(es) that can be used without authentication.
482 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
485 set_noauth_addr(argv)
489 int l = strlen(addr) + 1;
492 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
494 novm("allow-ip argument");
495 wp->word = (char *) (wp + 1);
496 wp->next = noauth_addrs;
497 BCOPY(addr, wp->word, l);
504 * set_permitted_number - set remote telephone number(s) that may connect.
507 set_permitted_number(argv)
510 char *number = *argv;
511 int l = strlen(number) + 1;
514 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
516 novm("allow-number argument");
517 wp->word = (char *) (wp + 1);
518 wp->next = permitted_numbers;
519 BCOPY(number, wp->word, l);
520 permitted_numbers = wp;
526 * An Open on LCP has requested a change from Dead to Establish phase.
527 * Do what's necessary to bring the physical layer up.
536 * LCP has terminated the link; go to the Dead phase and take the
537 * physical layer down.
540 link_terminated(unit)
543 if (phase == PHASE_DEAD)
545 if (pap_logout_hook) {
551 new_phase(PHASE_DEAD);
552 notice("Connection terminated.");
556 * LCP has gone down; it will either die or try to re-establish.
563 struct protent *protp;
565 notify(link_down_notifier, 0);
567 if (auth_script_state == s_up && auth_script_pid == 0) {
568 update_link_stats(unit);
569 auth_script_state = s_down;
570 auth_script(_PATH_AUTHDOWN);
572 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
573 if (!protp->enabled_flag)
575 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
576 (*protp->lowerdown)(unit);
577 if (protp->protocol < 0xC000 && protp->close != NULL)
578 (*protp->close)(unit, "LCP down");
582 if (phase != PHASE_DEAD)
583 new_phase(PHASE_ESTABLISH);
587 * The link is established.
588 * Proceed to the Dead, Authenticate or Network phase as appropriate.
591 link_established(unit)
595 lcp_options *wo = &lcp_wantoptions[unit];
596 lcp_options *go = &lcp_gotoptions[unit];
597 lcp_options *ho = &lcp_hisoptions[unit];
599 struct protent *protp;
602 * Tell higher-level protocols that LCP is up.
604 for (i = 0; (protp = protocols[i]) != NULL; ++i)
605 if (protp->protocol != PPP_LCP && protp->enabled_flag
606 && protp->lowerup != NULL)
607 (*protp->lowerup)(unit);
609 if (!auth_required && noauth_addrs != NULL)
610 set_allowed_addrs(unit, NULL, NULL);
612 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) {
614 * We wanted the peer to authenticate itself, and it refused:
615 * if we have some address(es) it can use without auth, fine,
616 * otherwise treat it as though it authenticated with PAP using
617 * a username of "" and a password of "". If that's not OK,
620 if (noauth_addrs != NULL) {
621 set_allowed_addrs(unit, NULL, NULL);
622 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
623 warn("peer refused to authenticate: terminating link");
624 lcp_close(unit, "peer refused to authenticate");
625 status = EXIT_PEER_AUTH_FAILED;
630 new_phase(PHASE_AUTHENTICATE);
634 eap_authpeer(unit, our_name);
636 } else if (go->neg_chap) {
637 ChapAuthPeer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
639 } else if (go->neg_upap) {
644 eap_authwithpeer(unit, user);
645 auth |= EAP_WITHPEER;
646 } else if (ho->neg_chap) {
647 ChapAuthWithPeer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
648 auth |= CHAP_WITHPEER;
649 } else if (ho->neg_upap) {
650 if (passwd[0] == 0) {
651 passwd_from_file = 1;
652 if (!get_pap_passwd(passwd))
653 error("No secret found for PAP login");
655 upap_authwithpeer(unit, user, passwd);
656 auth |= PAP_WITHPEER;
658 auth_pending[unit] = auth;
666 * Proceed to the network phase.
672 lcp_options *go = &lcp_gotoptions[unit];
674 /* Log calling number. */
676 notice("peer from calling number %q authorized", remote_number);
679 * If the peer had to authenticate, run the auth-up script now.
681 if (go->neg_chap || go->neg_upap || go->neg_eap) {
682 notify(auth_up_notifier, 0);
684 if (auth_script_state == s_down && auth_script_pid == 0) {
685 auth_script_state = s_up;
686 auth_script(_PATH_AUTHUP);
692 * If we negotiated callback, do it now.
695 new_phase(PHASE_CALLBACK);
696 (*cbcp_protent.open)(unit);
702 * Process extra options from the secrets file
705 options_from_list(extra_options, 1);
706 free_wordlist(extra_options);
709 start_networks(unit);
717 struct protent *protp;
718 int ecp_required, mppe_required;
720 new_phase(PHASE_NETWORK);
722 #ifdef HAVE_MULTILINK
724 if (mp_join_bundle()) {
725 if (updetach && !nodetach)
730 #endif /* HAVE_MULTILINK */
734 set_filters(&pass_filter, &active_filter);
736 /* Start CCP and ECP */
737 for (i = 0; (protp = protocols[i]) != NULL; ++i)
738 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
739 && protp->enabled_flag && protp->open != NULL)
743 * Bring up other network protocols iff encryption is not required.
745 ecp_required = ecp_gotoptions[unit].required;
746 mppe_required = ccp_gotoptions[unit].mppe;
747 if (!ecp_required && !mppe_required)
748 continue_networks(unit);
752 continue_networks(unit)
756 struct protent *protp;
759 * Start the "real" network protocols.
761 for (i = 0; (protp = protocols[i]) != NULL; ++i)
762 if (protp->protocol < 0xC000
763 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
764 && protp->enabled_flag && protp->open != NULL) {
769 if (num_np_open == 0)
771 lcp_close(0, "No network protocols running");
775 * The peer has failed to authenticate himself using `protocol'.
778 auth_peer_fail(unit, protocol)
782 * Authentication failure: take the link down
784 lcp_close(unit, "Authentication failed");
785 status = EXIT_PEER_AUTH_FAILED;
789 * The peer has been successfully authenticated using `protocol'.
792 auth_peer_success(unit, protocol, prot_flavor, name, namelen)
793 int unit, protocol, prot_flavor;
802 switch (prot_flavor) {
803 case CHAP_DIGEST_MD5:
804 bit |= CHAP_MD5_PEER;
810 case CHAP_MICROSOFT_V2:
811 bit |= CHAP_MS2_PEER;
823 warn("auth_peer_success: unknown protocol %x", protocol);
828 * Save the authenticated name of the peer for later.
830 if (namelen > sizeof(peer_authname) - 1)
831 namelen = sizeof(peer_authname) - 1;
832 BCOPY(name, peer_authname, namelen);
833 peer_authname[namelen] = 0;
834 script_setenv("PEERNAME", peer_authname, 0);
836 /* Save the authentication method for later. */
837 auth_done[unit] |= bit;
840 * If there is no more authentication still to be done,
841 * proceed to the network (or callback) phase.
843 if ((auth_pending[unit] &= ~bit) == 0)
848 * We have failed to authenticate ourselves to the peer using `protocol'.
851 auth_withpeer_fail(unit, protocol)
854 if (passwd_from_file)
855 BZERO(passwd, MAXSECRETLEN);
857 * We've failed to authenticate ourselves to our peer.
858 * Some servers keep sending CHAP challenges, but there
859 * is no point in persisting without any way to get updated
860 * authentication secrets.
862 lcp_close(unit, "Failed to authenticate ourselves to peer");
863 status = EXIT_AUTH_TOPEER_FAILED;
867 * We have successfully authenticated ourselves with the peer using `protocol'.
870 auth_withpeer_success(unit, protocol, prot_flavor)
871 int unit, protocol, prot_flavor;
878 switch (prot_flavor) {
879 case CHAP_DIGEST_MD5:
880 bit |= CHAP_MD5_WITHPEER;
884 bit |= CHAP_MS_WITHPEER;
886 case CHAP_MICROSOFT_V2:
887 bit |= CHAP_MS2_WITHPEER;
893 if (passwd_from_file)
894 BZERO(passwd, MAXSECRETLEN);
901 warn("auth_withpeer_success: unknown protocol %x", protocol);
905 /* Save the authentication method for later. */
906 auth_done[unit] |= bit;
909 * If there is no more authentication still being done,
910 * proceed to the network (or callback) phase.
912 if ((auth_pending[unit] &= ~bit) == 0)
918 * np_up - a network protocol has come up.
926 if (num_np_up == 0) {
928 * At this point we consider that the link has come up successfully.
932 new_phase(PHASE_RUNNING);
934 if (idle_time_hook != 0)
935 tlim = (*idle_time_hook)(NULL);
937 tlim = idle_time_limit;
939 TIMEOUT(check_idle, NULL, tlim);
942 * Set a timeout to close the connection once the maximum
943 * connect time has expired.
946 TIMEOUT(connect_time_expired, 0, maxconnect);
950 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
954 * Detach now, if the updetach option was given.
956 if (updetach && !nodetach)
963 * np_down - a network protocol has gone down.
969 if (--num_np_up == 0) {
970 UNTIMEOUT(check_idle, NULL);
971 UNTIMEOUT(connect_time_expired, NULL);
973 UNTIMEOUT(check_maxoctets, NULL);
975 new_phase(PHASE_NETWORK);
980 * np_finished - a network protocol has finished using the link.
983 np_finished(unit, proto)
986 if (--num_np_open <= 0) {
987 /* no further use for the link: shut up shop. */
988 lcp_close(0, "No network protocols running");
1000 update_link_stats(ifunit);
1003 switch(maxoctets_dir) {
1004 case PPP_OCTETS_DIRECTION_IN:
1005 used = link_stats.bytes_in;
1007 case PPP_OCTETS_DIRECTION_OUT:
1008 used = link_stats.bytes_out;
1010 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1011 case PPP_OCTETS_DIRECTION_MAXSESSION:
1012 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1015 used = link_stats.bytes_in+link_stats.bytes_out;
1018 diff = maxoctets - used;
1020 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1021 lcp_close(0, "Traffic limit");
1023 status = EXIT_TRAFFIC_LIMIT;
1025 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1031 * check_idle - check whether the link has been idle for long
1032 * enough that we can shut it down.
1038 struct ppp_idle idle;
1042 if (!get_idle_time(0, &idle))
1044 if (idle_time_hook != 0) {
1045 tlim = idle_time_hook(&idle);
1047 itime = MIN(idle.xmit_idle, idle.recv_idle);
1048 tlim = idle_time_limit - itime;
1051 /* link is idle: shut it down. */
1052 notice("Terminating connection due to lack of activity.");
1053 lcp_close(0, "Link inactive");
1055 status = EXIT_IDLE_TIMEOUT;
1057 TIMEOUT(check_idle, NULL, tlim);
1062 * connect_time_expired - log a message and close the connection.
1065 connect_time_expired(arg)
1068 info("Connect time expired");
1069 lcp_close(0, "Connect time expired"); /* Close connection */
1070 status = EXIT_CONNECT_TIME;
1074 * auth_check_options - called to check authentication options.
1077 auth_check_options()
1079 lcp_options *wo = &lcp_wantoptions[0];
1083 /* Default our_name to hostname, and user to our_name */
1084 if (our_name[0] == 0 || usehostname)
1085 strlcpy(our_name, hostname, sizeof(our_name));
1087 strlcpy(user, our_name, sizeof(user));
1090 * If we have a default route, require the peer to authenticate
1091 * unless the noauth option was given or the real user is root.
1093 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1098 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1099 if (wo->chap_mdtype)
1102 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1103 if (auth_required) {
1105 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) {
1106 wo->neg_chap = 1; wo->chap_mdtype = MDTYPE_ALL;
1111 wo->neg_chap = 0; wo->chap_mdtype = MDTYPE_NONE;
1117 * Check whether we have appropriate secrets to use
1118 * to authenticate the peer. Note that EAP can authenticate by way
1119 * of a CHAP-like exchanges as well as SRP.
1122 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1123 if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
1124 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1125 our_name, 1, &lacks_ip);
1127 if (!can_auth && wo->neg_eap) {
1128 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1129 our_name, 1, &lacks_ip);
1132 if (auth_required && !can_auth && noauth_addrs == NULL) {
1135 "By default the remote system is required to authenticate itself");
1137 "(because this system has a default route to the internet)");
1138 } else if (explicit_remote)
1140 "The remote system (%s) is required to authenticate itself",
1144 "The remote system is required to authenticate itself");
1146 "but I couldn't find any suitable secret (password) for it to use to do so.");
1149 "(None of the available passwords would let it use an IP address.)");
1155 * Early check for remote number authorization.
1157 if (!auth_number()) {
1158 warn("calling number %q is not authorized", remote_number);
1159 exit(EXIT_CNID_AUTH_FAILED);
1164 * auth_reset - called when LCP is starting negotiations to recheck
1165 * authentication options, i.e. whether we have appropriate secrets
1166 * to use for authenticating ourselves and/or the peer.
1172 lcp_options *go = &lcp_gotoptions[unit];
1173 lcp_options *ao = &lcp_allowoptions[unit];
1177 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1178 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1179 && (passwd[0] != 0 ||
1180 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1182 ao->neg_eap = !refuse_eap && (
1184 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1185 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1186 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL));
1189 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1192 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1193 our_name, 1, NULL)))
1197 (hadchap == 0 || (hadchap == -1 &&
1198 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1200 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1207 * check_passwd - Check the user name and passwd against the PAP secrets
1208 * file. If requested, also check against the system password database,
1209 * and login the user if OK.
1212 * UPAP_AUTHNAK: Authentication failed.
1213 * UPAP_AUTHACK: Authentication succeeded.
1214 * In either case, msg points to an appropriate message.
1217 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
1228 struct wordlist *addrs = NULL, *opts = NULL;
1229 char passwd[256], user[256];
1230 char secret[MAXWORDLEN];
1231 static int attempts = 0;
1234 * Make copies of apasswd and auser, then null-terminate them.
1235 * If there are unprintable characters in the password, make
1238 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1239 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1243 * Check if a plugin wants to handle this.
1245 if (pap_auth_hook) {
1246 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1249 set_allowed_addrs(unit, addrs, opts);
1250 BZERO(passwd, sizeof(passwd));
1252 free_wordlist(addrs);
1254 free_wordlist(opts);
1256 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1261 * Open the file of pap secrets and scan for a suitable secret
1262 * for authenticating this user.
1264 filename = _PATH_UPAPFILE;
1265 addrs = opts = NULL;
1267 f = fopen(filename, "r");
1269 error("Can't open PAP password file %s: %m", filename);
1272 check_access(f, filename);
1273 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1274 warn("no PAP secret found for %s", user);
1277 * If the secret is "@login", it means to check
1278 * the password against the login database.
1280 int login_secret = strcmp(secret, "@login") == 0;
1282 if (uselogin || login_secret) {
1283 /* login option or secret is @login */
1284 if ((ret = plogin(user, passwd, msg)) == UPAP_AUTHACK)
1287 if (secret[0] != 0 && !login_secret) {
1288 /* password given in pap-secrets - must match */
1289 if ((cryptpap || strcmp(passwd, secret) != 0)
1290 && strcmp(crypt(passwd, secret), secret) != 0)
1297 if (ret == UPAP_AUTHNAK) {
1299 *msg = "Login incorrect";
1301 * XXX can we ever get here more than once??
1302 * Frustrate passwd stealer programs.
1303 * Allow 10 tries, but start backing off after 3 (stolen from login).
1304 * On 10'th, drop the connection.
1306 if (attempts++ >= 10) {
1307 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1308 lcp_close(unit, "login failed");
1311 sleep((u_int) (attempts - 3) * 5);
1313 free_wordlist(opts);
1316 attempts = 0; /* Reset count */
1319 set_allowed_addrs(unit, addrs, opts);
1323 free_wordlist(addrs);
1324 BZERO(passwd, sizeof(passwd));
1325 BZERO(secret, sizeof(secret));
1331 * This function is needed for PAM.
1335 /* Static variables used to communicate between the conversation function
1336 * and the server_login function
1338 static char *PAM_username;
1339 static char *PAM_password;
1340 static int PAM_error = 0;
1341 static pam_handle_t *pamh = NULL;
1343 /* PAM conversation function
1344 * Here we assume (for now, at least) that echo on means login name, and
1345 * echo off means password.
1348 static int PAM_conv (int num_msg,
1352 struct pam_message **msg,
1353 struct pam_response **resp, void *appdata_ptr)
1356 struct pam_response *reply = NULL;
1358 #define COPY_STRING(s) (s) ? strdup(s) : NULL
1360 reply = malloc(sizeof(struct pam_response) * num_msg);
1361 if (!reply) return PAM_CONV_ERR;
1363 for (replies = 0; replies < num_msg; replies++) {
1364 switch (msg[replies]->msg_style) {
1365 case PAM_PROMPT_ECHO_ON:
1366 reply[replies].resp_retcode = PAM_SUCCESS;
1367 reply[replies].resp = COPY_STRING(PAM_username);
1368 /* PAM frees resp */
1370 case PAM_PROMPT_ECHO_OFF:
1371 reply[replies].resp_retcode = PAM_SUCCESS;
1372 reply[replies].resp = COPY_STRING(PAM_password);
1373 /* PAM frees resp */
1378 /* ignore it, but pam still wants a NULL response... */
1379 reply[replies].resp_retcode = PAM_SUCCESS;
1380 reply[replies].resp = NULL;
1383 /* Must be an error of some sort... */
1386 return PAM_CONV_ERR;
1393 static struct pam_conv PAM_conversation = {
1397 #endif /* USE_PAM */
1400 * plogin - Check the user name and password against the system
1401 * password database, and login the user if OK.
1404 * UPAP_AUTHNAK: Login failed.
1405 * UPAP_AUTHACK: Login succeeded.
1406 * In either case, msg points to an appropriate message.
1410 plogin(user, passwd, msg)
1420 pam_error = pam_start ("ppp", user, &PAM_conversation, &pamh);
1421 if (pam_error != PAM_SUCCESS) {
1422 *msg = (char *) pam_strerror (pamh, pam_error);
1424 return UPAP_AUTHNAK;
1427 * Define the fields for the credential validation
1430 PAM_username = user;
1431 PAM_password = passwd;
1433 pam_set_item (pamh, PAM_TTY, devnam); /* this might be useful to some modules */
1438 pam_error = pam_authenticate (pamh, PAM_SILENT);
1439 if (pam_error == PAM_SUCCESS && !PAM_error) {
1440 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
1441 if (pam_error == PAM_SUCCESS)
1442 pam_error = pam_open_session (pamh, PAM_SILENT);
1445 *msg = (char *) pam_strerror (pamh, pam_error);
1450 reopen_log(); /* apparently the PAM stuff does closelog() */
1451 PAM_username = NULL;
1452 PAM_password = NULL;
1453 if (pam_error != PAM_SUCCESS)
1454 return UPAP_AUTHNAK;
1455 #else /* #ifdef USE_PAM */
1458 * Use the non-PAM methods directly
1463 struct spwd *getspnam();
1465 struct passwd *pw = getpwnam(user);
1469 return (UPAP_AUTHNAK);
1472 spwd = getspnam(user);
1475 /* check the age of the password entry */
1476 long now = time(NULL) / 86400L;
1478 if ((spwd->sp_expire > 0 && now >= spwd->sp_expire)
1479 || ((spwd->sp_max >= 0 && spwd->sp_max < 10000)
1480 && spwd->sp_lstchg >= 0
1481 && now >= spwd->sp_lstchg + spwd->sp_max)) {
1482 warn("Password for %s has expired", user);
1483 return (UPAP_AUTHNAK);
1485 pw->pw_passwd = spwd->sp_pwdp;
1490 * If no passwd, don't let them login.
1492 if (pw->pw_passwd == NULL || strlen(pw->pw_passwd) < 2
1493 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
1494 return (UPAP_AUTHNAK);
1496 #endif /* #ifdef USE_PAM */
1499 * Write a wtmp entry for this user.
1503 if (strncmp(tty, "/dev/", 5) == 0)
1505 logwtmp(tty, user, ifname); /* Add wtmp login entry */
1507 #if defined(_PATH_LASTLOG) && !defined(USE_PAM)
1508 if (pw != (struct passwd *)NULL) {
1512 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1513 (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
1514 memset((void *)&ll, 0, sizeof(ll));
1515 (void)time(&ll.ll_time);
1516 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
1517 (void)write(fd, (char *)&ll, sizeof(ll));
1521 #endif /* _PATH_LASTLOG and not USE_PAM */
1523 info("user %s logged in", user);
1526 return (UPAP_AUTHACK);
1530 * plogout - Logout the user.
1539 pam_error = pam_close_session (pamh, PAM_SILENT);
1540 pam_end (pamh, pam_error);
1543 /* Apparently the pam stuff does closelog(). */
1545 #else /* ! USE_PAM */
1549 if (strncmp(tty, "/dev/", 5) == 0)
1551 logwtmp(tty, "", ""); /* Wipe out utmp logout entry */
1552 #endif /* ! USE_PAM */
1558 * null_login - Check if a username of "" and a password of "" are
1559 * acceptable, and iff so, set the list of acceptable IP addresses
1569 struct wordlist *addrs, *opts;
1570 char secret[MAXWORDLEN];
1573 * Check if a plugin wants to handle this.
1577 ret = (*null_auth_hook)(&addrs, &opts);
1580 * Open the file of pap secrets and scan for a suitable secret.
1583 filename = _PATH_UPAPFILE;
1585 f = fopen(filename, "r");
1588 check_access(f, filename);
1590 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1591 ret = i >= 0 && secret[0] == 0;
1592 BZERO(secret, sizeof(secret));
1597 set_allowed_addrs(unit, addrs, opts);
1599 free_wordlist(opts);
1601 free_wordlist(addrs);
1608 * get_pap_passwd - get a password for authenticating ourselves with
1609 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1611 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1614 get_pap_passwd(passwd)
1620 char secret[MAXWORDLEN];
1623 * Check whether a plugin wants to supply this.
1625 if (pap_passwd_hook) {
1626 ret = (*pap_passwd_hook)(user, passwd);
1631 filename = _PATH_UPAPFILE;
1632 f = fopen(filename, "r");
1635 check_access(f, filename);
1636 ret = scan_authfile(f, user,
1637 (remote_name[0]? remote_name: NULL),
1638 secret, NULL, NULL, filename, 0);
1643 strlcpy(passwd, secret, MAXSECRETLEN);
1644 BZERO(secret, sizeof(secret));
1650 * have_pap_secret - check whether we have a PAP file with any
1651 * secrets that we could possibly use for authenticating the peer.
1654 have_pap_secret(lacks_ipp)
1660 struct wordlist *addrs;
1662 /* let the plugin decide, if there is one */
1663 if (pap_check_hook) {
1664 ret = (*pap_check_hook)();
1669 filename = _PATH_UPAPFILE;
1670 f = fopen(filename, "r");
1674 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1675 NULL, &addrs, NULL, filename, 0);
1677 if (ret >= 0 && !some_ip_ok(addrs)) {
1683 free_wordlist(addrs);
1690 * have_chap_secret - check whether we have a CHAP file with a
1691 * secret that we could possibly use for authenticating `client'
1692 * on `server'. Either can be the null string, meaning we don't
1693 * know the identity yet.
1696 have_chap_secret(client, server, need_ip, lacks_ipp)
1705 struct wordlist *addrs;
1707 if (chap_check_hook) {
1708 ret = (*chap_check_hook)();
1714 filename = _PATH_CHAPFILE;
1715 f = fopen(filename, "r");
1719 if (client != NULL && client[0] == 0)
1721 else if (server != NULL && server[0] == 0)
1724 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1726 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1732 free_wordlist(addrs);
1739 * have_srp_secret - check whether we have a SRP file with a
1740 * secret that we could possibly use for authenticating `client'
1741 * on `server'. Either can be the null string, meaning we don't
1742 * know the identity yet.
1745 have_srp_secret(client, server, need_ip, lacks_ipp)
1754 struct wordlist *addrs;
1756 filename = _PATH_SRPFILE;
1757 f = fopen(filename, "r");
1761 if (client != NULL && client[0] == 0)
1763 else if (server != NULL && server[0] == 0)
1766 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1768 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1774 free_wordlist(addrs);
1781 * get_secret - open the CHAP secret file and return the secret
1782 * for authenticating the given client on the given server.
1783 * (We could be either client or server).
1786 get_secret(unit, client, server, secret, secret_len, am_server)
1797 struct wordlist *addrs, *opts;
1798 char secbuf[MAXWORDLEN];
1800 if (!am_server && passwd[0] != 0) {
1801 strlcpy(secbuf, passwd, sizeof(secbuf));
1802 } else if (!am_server && chap_passwd_hook) {
1803 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1804 error("Unable to obtain CHAP password for %s on %s from plugin",
1809 filename = _PATH_CHAPFILE;
1813 f = fopen(filename, "r");
1815 error("Can't open chap secret file %s: %m", filename);
1818 check_access(f, filename);
1820 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1826 set_allowed_addrs(unit, addrs, opts);
1828 free_wordlist(opts);
1830 free_wordlist(addrs);
1833 len = strlen(secbuf);
1834 if (len > MAXSECRETLEN) {
1835 error("Secret for %s on %s is too long", client, server);
1838 BCOPY(secbuf, secret, len);
1839 BZERO(secbuf, sizeof(secbuf));
1847 * get_srp_secret - open the SRP secret file and return the secret
1848 * for authenticating the given client on the given server.
1849 * (We could be either client or server).
1852 get_srp_secret(unit, client, server, secret, am_server)
1862 struct wordlist *addrs, *opts;
1864 if (!am_server && passwd[0] != '\0') {
1865 strlcpy(secret, passwd, MAXWORDLEN);
1867 filename = _PATH_SRPFILE;
1870 fp = fopen(filename, "r");
1872 error("Can't open srp secret file %s: %m", filename);
1875 check_access(fp, filename);
1878 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
1879 filename, am_server);
1885 set_allowed_addrs(unit, addrs, opts);
1886 else if (opts != NULL)
1887 free_wordlist(opts);
1889 free_wordlist(addrs);
1896 * set_allowed_addrs() - set the list of allowed addresses.
1897 * Also looks for `--' indicating options to apply for this peer
1898 * and leaves the following words in extra_options.
1901 set_allowed_addrs(unit, addrs, opts)
1903 struct wordlist *addrs;
1904 struct wordlist *opts;
1907 struct wordlist *ap, **plink;
1908 struct permitted_ip *ip;
1909 char *ptr_word, *ptr_mask;
1912 u_int32_t a, mask, ah, offset;
1913 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1914 u_int32_t suggested_ip = 0;
1916 if (addresses[unit] != NULL)
1917 free(addresses[unit]);
1918 addresses[unit] = NULL;
1919 if (extra_options != NULL)
1920 free_wordlist(extra_options);
1921 extra_options = opts;
1924 * Count the number of IP addresses given.
1926 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
1929 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
1933 /* temporarily append the noauth_addrs list to addrs */
1934 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
1936 *plink = noauth_addrs;
1939 for (ap = addrs; ap != NULL; ap = ap->next) {
1940 /* "-" means no addresses authorized, "*" means any address allowed */
1941 ptr_word = ap->word;
1942 if (strcmp(ptr_word, "-") == 0)
1944 if (strcmp(ptr_word, "*") == 0) {
1946 ip[n].base = ip[n].mask = 0;
1952 if (*ptr_word == '!') {
1957 mask = ~ (u_int32_t) 0;
1959 ptr_mask = strchr (ptr_word, '/');
1960 if (ptr_mask != NULL) {
1964 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
1965 if (bit_count <= 0 || bit_count > 32) {
1966 warn("invalid address length %v in auth. address list",
1970 bit_count = 32 - bit_count; /* # bits in host part */
1972 offset = ifunit + 1;
1976 warn("invalid address length syntax: %v", ptr_mask+1);
1983 hp = gethostbyname(ptr_word);
1984 if (hp != NULL && hp->h_addrtype == AF_INET) {
1985 a = *(u_int32_t *)hp->h_addr;
1987 np = getnetbyname (ptr_word);
1988 if (np != NULL && np->n_addrtype == AF_INET) {
1989 a = htonl ((u_int32_t)np->n_net);
1990 if (ptr_mask == NULL) {
1991 /* calculate appropriate mask for net */
1994 mask = IN_CLASSA_NET;
1995 else if (IN_CLASSB(ah))
1996 mask = IN_CLASSB_NET;
1997 else if (IN_CLASSC(ah))
1998 mask = IN_CLASSC_NET;
2001 a = inet_addr (ptr_word);
2005 if (ptr_mask != NULL)
2008 if (a == (u_int32_t)-1L) {
2009 warn("unknown host %s in auth. address list", ap->word);
2013 if (offset >= ~mask) {
2014 warn("interface unit %d too large for subnet %v",
2018 a = htonl((ntohl(a) & mask) + offset);
2019 mask = ~(u_int32_t)0;
2021 ip[n].mask = htonl(mask);
2022 ip[n].base = a & ip[n].mask;
2024 if (~mask == 0 && suggested_ip == 0)
2029 ip[n].permit = 0; /* make the last entry forbid all addresses */
2030 ip[n].base = 0; /* to terminate the list */
2033 addresses[unit] = ip;
2036 * If the address given for the peer isn't authorized, or if
2037 * the user hasn't given one, AND there is an authorized address
2038 * which is a single host, then use that if we find one.
2040 if (suggested_ip != 0
2041 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2042 wo->hisaddr = suggested_ip;
2044 * Do we insist on this address? No, if there are other
2045 * addresses authorized than the suggested one.
2048 wo->accept_remote = 1;
2053 * auth_ip_addr - check whether the peer is authorized to use
2054 * a given IP address. Returns 1 if authorized, 0 otherwise.
2057 auth_ip_addr(unit, addr)
2063 /* don't allow loopback or multicast address */
2064 if (bad_ip_adrs(addr))
2067 if (allowed_address_hook) {
2068 ok = allowed_address_hook(addr);
2069 if (ok >= 0) return ok;
2072 if (addresses[unit] != NULL) {
2073 ok = ip_addr_check(addr, addresses[unit]);
2079 return 0; /* no addresses authorized */
2080 return allow_any_ip || privileged || !have_route_to(addr);
2084 ip_addr_check(addr, addrs)
2086 struct permitted_ip *addrs;
2089 if ((addr & addrs->mask) == addrs->base)
2090 return addrs->permit;
2094 * bad_ip_adrs - return 1 if the IP address is one we don't want
2095 * to use, such as an address in the loopback net or a multicast address.
2096 * addr is in network byte order.
2103 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2104 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2108 * some_ip_ok - check a wordlist to see if it authorizes any
2113 struct wordlist *addrs;
2115 for (; addrs != 0; addrs = addrs->next) {
2116 if (addrs->word[0] == '-')
2118 if (addrs->word[0] != '!')
2119 return 1; /* some IP address is allowed */
2125 * auth_number - check whether the remote number is allowed to connect.
2126 * Returns 1 if authorized, 0 otherwise.
2131 struct wordlist *wp = permitted_numbers;
2134 /* Allow all if no authorization list. */
2138 /* Allow if we have a match in the authorization list. */
2140 /* trailing '*' wildcard */
2141 l = strlen(wp->word);
2142 if ((wp->word)[l - 1] == '*')
2144 if (!strncasecmp(wp->word, remote_number, l))
2153 * check_access - complain if a secret file has too-liberal permissions.
2156 check_access(f, filename)
2162 if (fstat(fileno(f), &sbuf) < 0) {
2163 warn("cannot stat secret file %s: %m", filename);
2164 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2165 warn("Warning - secret file %s has world and/or group access",
2172 * scan_authfile - Scan an authorization file for a secret suitable
2173 * for authenticating `client' on `server'. The return value is -1
2174 * if no secret is found, otherwise >= 0. The return value has
2175 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2176 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2177 * Any following words on the line up to a "--" (i.e. address authorization
2178 * info) are placed in a wordlist and returned in *addrs. Any
2179 * following words (extra options) are placed in a wordlist and
2180 * returned in *opts.
2181 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2182 * Flags are non-zero if we need two colons in the secret in order to
2186 scan_authfile(f, client, server, secret, addrs, opts, filename, flags)
2191 struct wordlist **addrs;
2192 struct wordlist **opts;
2197 int got_flag, best_flag;
2199 struct wordlist *ap, *addr_list, *alist, **app;
2200 char word[MAXWORDLEN];
2201 char atfile[MAXWORDLEN];
2202 char lsecret[MAXWORDLEN];
2210 if (!getword(f, word, &newline, filename))
2211 return -1; /* file is empty??? */
2216 * Skip until we find a word at the start of a line.
2218 while (!newline && getword(f, word, &newline, filename))
2221 break; /* got to end of file */
2224 * Got a client - check if it's a match or a wildcard.
2227 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2232 got_flag = NONWILD_CLIENT;
2235 * Now get a server and check if it matches.
2237 if (!getword(f, word, &newline, filename))
2241 if (!ISWILD(word)) {
2242 if (server != NULL && strcmp(word, server) != 0)
2244 got_flag |= NONWILD_SERVER;
2248 * Got some sort of a match - see if it's better than what
2251 if (got_flag <= best_flag)
2257 if (!getword(f, word, &newline, filename))
2263 * SRP-SHA1 authenticator should never be reading secrets from
2264 * a file. (Authenticatee may, though.)
2266 if (flags && ((cp = strchr(word, ':')) == NULL ||
2267 strchr(cp + 1, ':') == NULL))
2270 if (secret != NULL) {
2272 * Special syntax: @/pathname means read secret from file.
2274 if (word[0] == '@' && word[1] == '/') {
2275 strlcpy(atfile, word+1, sizeof(atfile));
2276 if ((sf = fopen(atfile, "r")) == NULL) {
2277 warn("can't open indirect secret file %s", atfile);
2280 check_access(sf, atfile);
2281 if (!getword(sf, word, &xxx, atfile)) {
2282 warn("no secret in indirect secret file %s", atfile);
2288 strlcpy(lsecret, word, sizeof(lsecret));
2292 * Now read address authorization info and make a wordlist.
2296 if (!getword(f, word, &newline, filename) || newline)
2298 ap = (struct wordlist *)
2299 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2301 novm("authorized addresses");
2302 ap->word = (char *) (ap + 1);
2303 strcpy(ap->word, word);
2310 * This is the best so far; remember it.
2312 best_flag = got_flag;
2314 free_wordlist(addr_list);
2317 strlcpy(secret, lsecret, MAXWORDLEN);
2323 /* scan for a -- word indicating the start of options */
2324 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2325 if (strcmp(ap->word, "--") == 0)
2327 /* ap = start of options */
2329 ap = ap->next; /* first option */
2330 free(*app); /* free the "--" word */
2331 *app = NULL; /* terminate addr list */
2335 else if (ap != NULL)
2339 else if (addr_list != NULL)
2340 free_wordlist(addr_list);
2346 * wordlist_count - return the number of items in a wordlist
2350 struct wordlist *wp;
2354 for (n = 0; wp != NULL; wp = wp->next)
2360 * free_wordlist - release memory allocated for a wordlist.
2364 struct wordlist *wp;
2366 struct wordlist *next;
2368 while (wp != NULL) {
2376 * auth_script_done - called when the auth-up or auth-down script
2380 auth_script_done(arg)
2383 auth_script_pid = 0;
2384 switch (auth_script_state) {
2386 if (auth_state == s_down) {
2387 auth_script_state = s_down;
2388 auth_script(_PATH_AUTHDOWN);
2392 if (auth_state == s_up) {
2393 auth_script_state = s_up;
2394 auth_script(_PATH_AUTHUP);
2401 * auth_script - execute a script with arguments
2402 * interface-name peer-name real-user tty speed
2414 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2415 user_name = pw->pw_name;
2417 slprintf(struid, sizeof(struid), "%d", getuid());
2420 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2424 argv[2] = peer_authname;
2425 argv[3] = user_name;
2430 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);