2 * auth.c - PPP authentication and phase control.
4 * Copyright (c) 1993 The Australian National University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by the Australian National University. The name of the University
13 * may not be used to endorse or promote products derived from this
14 * software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 * Copyright (c) 1989 Carnegie Mellon University.
20 * All rights reserved.
22 * Redistribution and use in source and binary forms are permitted
23 * provided that the above copyright notice and this paragraph are
24 * duplicated in all such forms and that any documentation,
25 * advertising materials, and other materials related to such
26 * distribution and use acknowledge that the software was developed
27 * by Carnegie Mellon University. The name of the
28 * University may not be used to endorse or promote products derived
29 * from this software without specific prior written permission.
30 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
32 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
35 #define RCSID "$Id: auth.c,v 1.85 2002/10/10 05:47:34 fcusack Exp $"
44 #include <sys/types.h>
46 #include <sys/socket.h>
49 #if defined(_PATH_LASTLOG) && defined(_linux_)
54 #include <netinet/in.h>
55 #include <arpa/inet.h>
58 #include <security/pam_appl.h>
64 #define PW_PPP PW_LOGIN
80 #include "pathnames.h"
82 static const char rcsid[] = RCSID;
84 /* Bits in scan_authfile return value */
85 #define NONWILD_SERVER 1
86 #define NONWILD_CLIENT 2
88 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
90 /* The name by which the peer authenticated itself to us. */
91 char peer_authname[MAXNAMELEN];
93 /* Records which authentication operations haven't completed yet. */
94 static int auth_pending[NUM_PPP];
96 /* Records which authentication operations have been completed. */
97 int auth_done[NUM_PPP];
99 /* Set if we have successfully called plogin() */
100 static int logged_in;
102 /* List of addresses which the peer may use. */
103 static struct permitted_ip *addresses[NUM_PPP];
105 /* Wordlist giving addresses which the peer may use
106 without authenticating itself. */
107 static struct wordlist *noauth_addrs;
109 /* Remote telephone number, if available */
110 char remote_number[MAXNAMELEN];
112 /* Wordlist giving remote telephone numbers which may connect. */
113 static struct wordlist *permitted_numbers;
115 /* Extra options to apply, from the secrets file entry for the peer. */
116 static struct wordlist *extra_options;
118 /* Number of network protocols which we have opened. */
119 static int num_np_open;
121 /* Number of network protocols which have come up. */
122 static int num_np_up;
124 /* Set if we got the contents of passwd[] from the pap-secrets file. */
125 static int passwd_from_file;
127 /* Set if we require authentication only because we have a default route. */
128 static bool default_auth;
130 /* Hook to enable a plugin to control the idle time limit */
131 int (*idle_time_hook) __P((struct ppp_idle *)) = NULL;
133 /* Hook for a plugin to say whether we can possibly authenticate any peer */
134 int (*pap_check_hook) __P((void)) = NULL;
136 /* Hook for a plugin to check the PAP user and password */
137 int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
138 struct wordlist **paddrs,
139 struct wordlist **popts)) = NULL;
141 /* Hook for a plugin to know about the PAP user logout */
142 void (*pap_logout_hook) __P((void)) = NULL;
144 /* Hook for a plugin to get the PAP password for authenticating us */
145 int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL;
147 /* Hook for a plugin to say whether it is OK if the peer
148 refuses to authenticate. */
149 int (*null_auth_hook) __P((struct wordlist **paddrs,
150 struct wordlist **popts)) = NULL;
152 int (*allowed_address_hook) __P((u_int32_t addr)) = NULL;
154 /* A notifier for when the peer has authenticated itself,
155 and we are proceeding to the network phase. */
156 struct notifier *auth_up_notifier = NULL;
158 /* A notifier for when the link goes down. */
159 struct notifier *link_down_notifier = NULL;
162 * This is used to ensure that we don't start an auth-up/down
163 * script while one is already running.
170 static enum script_state auth_state = s_down;
171 static enum script_state auth_script_state = s_down;
172 static pid_t auth_script_pid = 0;
174 static int used_login; /* peer authenticated against login database */
179 bool uselogin = 0; /* Use /etc/passwd for checking PAP */
180 bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
181 bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
182 bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
184 bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */
185 bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */
187 bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */
188 bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */
190 bool usehostname = 0; /* Use hostname for our_name */
191 bool auth_required = 0; /* Always require authentication from peer */
192 bool allow_any_ip = 0; /* Allow peer to use any IP address */
193 bool explicit_remote = 0; /* User specified explicit remote name */
194 char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
196 static char *uafname; /* name of most recent +ua file */
198 extern char *crypt __P((const char *, const char *));
200 /* Prototypes for procedures local to this file. */
202 static void network_phase __P((int));
203 static void check_idle __P((void *));
204 static void connect_time_expired __P((void *));
205 static int plogin __P((char *, char *, char **));
206 static void plogout __P((void));
207 static int null_login __P((int));
208 static int get_pap_passwd __P((char *));
209 static int have_pap_secret __P((int *));
210 static int have_chap_secret __P((char *, char *, int, int *));
211 static int ip_addr_check __P((u_int32_t, struct permitted_ip *));
212 static int scan_authfile __P((FILE *, char *, char *, char *,
213 struct wordlist **, struct wordlist **,
215 static void free_wordlist __P((struct wordlist *));
216 static void auth_script __P((char *));
217 static void auth_script_done __P((void *));
218 static void set_allowed_addrs __P((int, struct wordlist *, struct wordlist *));
219 static int some_ip_ok __P((struct wordlist *));
220 static int setupapfile __P((char **));
221 static int privgroup __P((char **));
222 static int set_noauth_addr __P((char **));
223 static int set_permitted_number __P((char **));
224 static void check_access __P((FILE *, char *));
225 static int wordlist_count __P((struct wordlist *));
228 static void check_maxoctets __P((void *));
232 * Authentication-related options.
234 option_t auth_options[] = {
235 { "auth", o_bool, &auth_required,
236 "Require authentication from peer", OPT_PRIO | 1 },
237 { "noauth", o_bool, &auth_required,
238 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
240 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
241 "Require PAP authentication from peer",
242 OPT_PRIOSUB | 1, &auth_required },
243 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
244 "Require PAP authentication from peer",
245 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
246 { "require-chap", o_bool, &auth_required,
247 "Require CHAP authentication from peer",
248 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
249 &lcp_wantoptions[0].chap_mdtype },
250 { "+chap", o_bool, &auth_required,
251 "Require CHAP authentication from peer",
252 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
253 &lcp_wantoptions[0].chap_mdtype },
255 { "require-mschap", o_bool, &auth_required,
256 "Require MS-CHAP authentication from peer",
257 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
258 &lcp_wantoptions[0].chap_mdtype },
259 { "+mschap", o_bool, &auth_required,
260 "Require MS-CHAP authentication from peer",
261 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
262 &lcp_wantoptions[0].chap_mdtype },
263 { "require-mschap-v2", o_bool, &auth_required,
264 "Require MS-CHAPv2 authentication from peer",
265 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
266 &lcp_wantoptions[0].chap_mdtype },
267 { "+mschap-v2", o_bool, &auth_required,
268 "Require MS-CHAPv2 authentication from peer",
269 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
270 &lcp_wantoptions[0].chap_mdtype },
273 { "refuse-pap", o_bool, &refuse_pap,
274 "Don't agree to auth to peer with PAP", 1 },
275 { "-pap", o_bool, &refuse_pap,
276 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
277 { "refuse-chap", o_bool, &refuse_chap,
278 "Don't agree to auth to peer with CHAP",
279 OPT_A2CLRB | MDTYPE_MD5,
280 &lcp_allowoptions[0].chap_mdtype },
281 { "-chap", o_bool, &refuse_chap,
282 "Don't allow CHAP authentication with peer",
283 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
284 &lcp_allowoptions[0].chap_mdtype },
286 { "refuse-mschap", o_bool, &refuse_mschap,
287 "Don't agree to auth to peer with MS-CHAP",
288 OPT_A2CLRB | MDTYPE_MICROSOFT,
289 &lcp_allowoptions[0].chap_mdtype },
290 { "-mschap", o_bool, &refuse_mschap,
291 "Don't allow MS-CHAP authentication with peer",
292 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
293 &lcp_allowoptions[0].chap_mdtype },
294 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
295 "Don't agree to auth to peer with MS-CHAPv2",
296 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
297 &lcp_allowoptions[0].chap_mdtype },
298 { "-mschap-v2", o_bool, &refuse_mschap_v2,
299 "Don't allow MS-CHAPv2 authentication with peer",
300 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
301 &lcp_allowoptions[0].chap_mdtype },
304 { "name", o_string, our_name,
305 "Set local name for authentication",
306 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
308 { "+ua", o_special, (void *)setupapfile,
309 "Get PAP user and password from file",
310 OPT_PRIO | OPT_A2STRVAL, &uafname },
312 { "user", o_string, user,
313 "Set name for auth with peer", OPT_PRIO | OPT_STATIC, NULL, MAXNAMELEN },
315 { "password", o_string, passwd,
316 "Password for authenticating us to the peer",
317 OPT_PRIO | OPT_STATIC | OPT_HIDE, NULL, MAXSECRETLEN },
319 { "usehostname", o_bool, &usehostname,
320 "Must use hostname for authentication", 1 },
322 { "remotename", o_string, remote_name,
323 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
324 &explicit_remote, MAXNAMELEN },
326 { "login", o_bool, &uselogin,
327 "Use system password database for PAP", 1 },
329 { "papcrypt", o_bool, &cryptpap,
330 "PAP passwords are encrypted", 1 },
332 { "privgroup", o_special, (void *)privgroup,
333 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
335 { "allow-ip", o_special, (void *)set_noauth_addr,
336 "Set IP address(es) which can be used without authentication",
337 OPT_PRIV | OPT_A2LIST },
339 { "remotenumber", o_string, remote_number,
340 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
343 { "allow-number", o_special, (void *)set_permitted_number,
344 "Set telephone number(s) which are allowed to connect",
345 OPT_PRIV | OPT_A2LIST },
351 * setupapfile - specifies UPAP info for authenticating with peer.
359 char u[MAXNAMELEN], p[MAXSECRETLEN];
362 lcp_allowoptions[0].neg_upap = 1;
364 /* open user info file */
365 fname = strdup(*argv);
367 novm("+ua file name");
369 ufile = fopen(fname, "r");
372 option_error("unable to open user login data file %s", fname);
375 check_access(ufile, fname);
379 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
380 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL){
381 option_error("unable to read user login data file %s", fname);
386 /* get rid of newlines */
388 if (l > 0 && u[l-1] == '\n')
391 if (l > 0 && p[l-1] == '\n')
394 if (override_value("user", option_priority, fname))
395 strlcpy(user, u, sizeof(user));
396 if (override_value("passwd", option_priority, fname))
397 strlcpy(passwd, p, sizeof(passwd));
404 * privgroup - allow members of the group to have privileged access.
415 option_error("group %s is unknown", *argv);
418 for (i = 0; i < ngroups; ++i) {
419 if (groups[i] == g->gr_gid) {
429 * set_noauth_addr - set address(es) that can be used without authentication.
430 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
433 set_noauth_addr(argv)
437 int l = strlen(addr) + 1;
440 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
442 novm("allow-ip argument");
443 wp->word = (char *) (wp + 1);
444 wp->next = noauth_addrs;
445 BCOPY(addr, wp->word, l);
452 * set_permitted_number - set remote telephone number(s) that may connect.
455 set_permitted_number(argv)
458 char *number = *argv;
459 int l = strlen(number) + 1;
462 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
464 novm("allow-number argument");
465 wp->word = (char *) (wp + 1);
466 wp->next = permitted_numbers;
467 BCOPY(number, wp->word, l);
468 permitted_numbers = wp;
474 * An Open on LCP has requested a change from Dead to Establish phase.
475 * Do what's necessary to bring the physical layer up.
484 * LCP has terminated the link; go to the Dead phase and take the
485 * physical layer down.
488 link_terminated(unit)
491 if (phase == PHASE_DEAD)
493 if (pap_logout_hook) {
499 new_phase(PHASE_DEAD);
500 notice("Connection terminated.");
504 * LCP has gone down; it will either die or try to re-establish.
511 struct protent *protp;
513 notify(link_down_notifier, 0);
515 if (auth_script_state == s_up && auth_script_pid == 0) {
516 update_link_stats(unit);
517 auth_script_state = s_down;
518 auth_script(_PATH_AUTHDOWN);
520 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
521 if (!protp->enabled_flag)
523 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
524 (*protp->lowerdown)(unit);
525 if (protp->protocol < 0xC000 && protp->close != NULL)
526 (*protp->close)(unit, "LCP down");
530 if (phase != PHASE_DEAD)
531 new_phase(PHASE_ESTABLISH);
535 * The link is established.
536 * Proceed to the Dead, Authenticate or Network phase as appropriate.
539 link_established(unit)
543 lcp_options *wo = &lcp_wantoptions[unit];
544 lcp_options *go = &lcp_gotoptions[unit];
545 lcp_options *ho = &lcp_hisoptions[unit];
547 struct protent *protp;
550 * Tell higher-level protocols that LCP is up.
552 for (i = 0; (protp = protocols[i]) != NULL; ++i)
553 if (protp->protocol != PPP_LCP && protp->enabled_flag
554 && protp->lowerup != NULL)
555 (*protp->lowerup)(unit);
557 if (auth_required && !(go->neg_upap || go->neg_chap)) {
559 * We wanted the peer to authenticate itself, and it refused:
560 * if we have some address(es) it can use without auth, fine,
561 * otherwise treat it as though it authenticated with PAP using
562 * a username of "" and a password of "". If that's not OK,
565 if (noauth_addrs != NULL) {
566 set_allowed_addrs(unit, NULL, NULL);
567 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
568 warn("peer refused to authenticate: terminating link");
569 lcp_close(unit, "peer refused to authenticate");
570 status = EXIT_PEER_AUTH_FAILED;
575 new_phase(PHASE_AUTHENTICATE);
579 ChapAuthPeer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
581 } else if (go->neg_upap) {
586 ChapAuthWithPeer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
587 auth |= CHAP_WITHPEER;
588 } else if (ho->neg_upap) {
589 if (passwd[0] == 0) {
590 passwd_from_file = 1;
591 if (!get_pap_passwd(passwd))
592 error("No secret found for PAP login");
594 upap_authwithpeer(unit, user, passwd);
595 auth |= PAP_WITHPEER;
597 auth_pending[unit] = auth;
605 * Proceed to the network phase.
611 lcp_options *go = &lcp_gotoptions[unit];
614 * If the peer had to authenticate, run the auth-up script now.
616 if (go->neg_chap || go->neg_upap) {
617 notify(auth_up_notifier, 0);
619 if (auth_script_state == s_down && auth_script_pid == 0) {
620 auth_script_state = s_up;
621 auth_script(_PATH_AUTHUP);
627 * If we negotiated callback, do it now.
630 new_phase(PHASE_CALLBACK);
631 (*cbcp_protent.open)(unit);
637 * Process extra options from the secrets file
640 options_from_list(extra_options, 1);
641 free_wordlist(extra_options);
644 start_networks(unit);
652 struct protent *protp;
653 int ecp_required, mppe_required;
655 new_phase(PHASE_NETWORK);
657 #ifdef HAVE_MULTILINK
659 if (mp_join_bundle()) {
660 if (updetach && !nodetach)
665 #endif /* HAVE_MULTILINK */
669 set_filters(&pass_filter, &active_filter);
671 /* Start CCP and ECP */
672 for (i = 0; (protp = protocols[i]) != NULL; ++i)
673 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
674 && protp->enabled_flag && protp->open != NULL)
678 * Bring up other network protocols iff encryption is not required.
680 ecp_required = ecp_gotoptions[unit].required;
681 mppe_required = ccp_gotoptions[unit].mppe;
682 if (!ecp_required && !mppe_required)
683 continue_networks(unit);
687 continue_networks(unit)
691 struct protent *protp;
694 * Start the "real" network protocols.
696 for (i = 0; (protp = protocols[i]) != NULL; ++i)
697 if (protp->protocol < 0xC000
698 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
699 && protp->enabled_flag && protp->open != NULL) {
704 if (num_np_open == 0)
706 lcp_close(0, "No network protocols running");
710 * The peer has failed to authenticate himself using `protocol'.
713 auth_peer_fail(unit, protocol)
717 * Authentication failure: take the link down
719 lcp_close(unit, "Authentication failed");
720 status = EXIT_PEER_AUTH_FAILED;
724 * The peer has been successfully authenticated using `protocol'.
727 auth_peer_success(unit, protocol, prot_flavor, name, namelen)
728 int unit, protocol, prot_flavor;
737 switch (prot_flavor) {
738 case CHAP_DIGEST_MD5:
739 bit |= CHAP_MD5_PEER;
745 case CHAP_MICROSOFT_V2:
746 bit |= CHAP_MS2_PEER;
755 warn("auth_peer_success: unknown protocol %x", protocol);
760 * Save the authenticated name of the peer for later.
762 if (namelen > sizeof(peer_authname) - 1)
763 namelen = sizeof(peer_authname) - 1;
764 BCOPY(name, peer_authname, namelen);
765 peer_authname[namelen] = 0;
766 script_setenv("PEERNAME", peer_authname, 0);
768 /* Save the authentication method for later. */
769 auth_done[unit] |= bit;
772 * If there is no more authentication still to be done,
773 * proceed to the network (or callback) phase.
775 if ((auth_pending[unit] &= ~bit) == 0)
780 * We have failed to authenticate ourselves to the peer using `protocol'.
783 auth_withpeer_fail(unit, protocol)
786 if (passwd_from_file)
787 BZERO(passwd, MAXSECRETLEN);
789 * We've failed to authenticate ourselves to our peer.
790 * Some servers keep sending CHAP challenges, but there
791 * is no point in persisting without any way to get updated
792 * authentication secrets.
794 lcp_close(unit, "Failed to authenticate ourselves to peer");
795 status = EXIT_AUTH_TOPEER_FAILED;
799 * We have successfully authenticated ourselves with the peer using `protocol'.
802 auth_withpeer_success(unit, protocol, prot_flavor)
803 int unit, protocol, prot_flavor;
810 switch (prot_flavor) {
811 case CHAP_DIGEST_MD5:
812 bit |= CHAP_MD5_WITHPEER;
816 bit |= CHAP_MS_WITHPEER;
818 case CHAP_MICROSOFT_V2:
819 bit |= CHAP_MS2_WITHPEER;
825 if (passwd_from_file)
826 BZERO(passwd, MAXSECRETLEN);
830 warn("auth_withpeer_success: unknown protocol %x", protocol);
834 /* Save the authentication method for later. */
835 auth_done[unit] |= bit;
838 * If there is no more authentication still being done,
839 * proceed to the network (or callback) phase.
841 if ((auth_pending[unit] &= ~bit) == 0)
847 * np_up - a network protocol has come up.
855 if (num_np_up == 0) {
857 * At this point we consider that the link has come up successfully.
861 new_phase(PHASE_RUNNING);
863 if (idle_time_hook != 0)
864 tlim = (*idle_time_hook)(NULL);
866 tlim = idle_time_limit;
868 TIMEOUT(check_idle, NULL, tlim);
871 * Set a timeout to close the connection once the maximum
872 * connect time has expired.
875 TIMEOUT(connect_time_expired, 0, maxconnect);
879 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
883 * Detach now, if the updetach option was given.
885 if (updetach && !nodetach)
892 * np_down - a network protocol has gone down.
898 if (--num_np_up == 0) {
899 UNTIMEOUT(check_idle, NULL);
900 UNTIMEOUT(connect_time_expired, NULL);
902 UNTIMEOUT(check_maxoctets, NULL);
904 new_phase(PHASE_NETWORK);
909 * np_finished - a network protocol has finished using the link.
912 np_finished(unit, proto)
915 if (--num_np_open <= 0) {
916 /* no further use for the link: shut up shop. */
917 lcp_close(0, "No network protocols running");
929 update_link_stats(ifunit);
932 switch(maxoctets_dir) {
933 case PPP_OCTETS_DIRECTION_IN:
934 used = link_stats.bytes_in;
936 case PPP_OCTETS_DIRECTION_OUT:
937 used = link_stats.bytes_out;
939 case PPP_OCTETS_DIRECTION_MAXOVERAL:
940 case PPP_OCTETS_DIRECTION_MAXSESSION:
941 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
944 used = link_stats.bytes_in+link_stats.bytes_out;
947 diff = maxoctets - used;
949 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
950 lcp_close(0, "Traffic limit");
952 status = EXIT_TRAFFIC_LIMIT;
954 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
960 * check_idle - check whether the link has been idle for long
961 * enough that we can shut it down.
967 struct ppp_idle idle;
971 if (!get_idle_time(0, &idle))
973 if (idle_time_hook != 0) {
974 tlim = idle_time_hook(&idle);
976 itime = MIN(idle.xmit_idle, idle.recv_idle);
977 tlim = idle_time_limit - itime;
980 /* link is idle: shut it down. */
981 notice("Terminating connection due to lack of activity.");
982 lcp_close(0, "Link inactive");
984 status = EXIT_IDLE_TIMEOUT;
986 TIMEOUT(check_idle, NULL, tlim);
991 * connect_time_expired - log a message and close the connection.
994 connect_time_expired(arg)
997 info("Connect time expired");
998 lcp_close(0, "Connect time expired"); /* Close connection */
999 status = EXIT_CONNECT_TIME;
1003 * auth_check_options - called to check authentication options.
1006 auth_check_options()
1008 lcp_options *wo = &lcp_wantoptions[0];
1012 /* Default our_name to hostname, and user to our_name */
1013 if (our_name[0] == 0 || usehostname)
1014 strlcpy(our_name, hostname, sizeof(our_name));
1016 strlcpy(user, our_name, sizeof(user));
1019 * If we have a default route, require the peer to authenticate
1020 * unless the noauth option was given or the real user is root.
1022 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1027 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1028 if (wo->chap_mdtype)
1031 /* If authentication is required, ask peer for CHAP or PAP. */
1032 if (auth_required) {
1034 if (!wo->neg_chap && !wo->neg_upap) {
1035 wo->neg_chap = 1; wo->chap_mdtype = MDTYPE_ALL;
1039 wo->neg_chap = 0; wo->chap_mdtype = MDTYPE_NONE;
1044 * Check whether we have appropriate secrets to use
1045 * to authenticate the peer.
1048 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1049 if (!can_auth && (wo->neg_chap)) {
1050 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1051 our_name, 1, &lacks_ip);
1054 if (auth_required && !can_auth && noauth_addrs == NULL) {
1057 "By default the remote system is required to authenticate itself");
1059 "(because this system has a default route to the internet)");
1060 } else if (explicit_remote)
1062 "The remote system (%s) is required to authenticate itself",
1066 "The remote system is required to authenticate itself");
1068 "but I couldn't find any suitable secret (password) for it to use to do so.");
1071 "(None of the available passwords would let it use an IP address.)");
1078 * auth_reset - called when LCP is starting negotiations to recheck
1079 * authentication options, i.e. whether we have appropriate secrets
1080 * to use for authenticating ourselves and/or the peer.
1086 lcp_options *go = &lcp_gotoptions[unit];
1087 lcp_options *ao = &lcp_allowoptions[0];
1089 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1090 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1092 || have_chap_secret(user, (explicit_remote? remote_name: NULL),
1095 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1098 if (!have_chap_secret((explicit_remote? remote_name: NULL),
1106 * check_passwd - Check the user name and passwd against the PAP secrets
1107 * file. If requested, also check against the system password database,
1108 * and login the user if OK.
1111 * UPAP_AUTHNAK: Authentication failed.
1112 * UPAP_AUTHACK: Authentication succeeded.
1113 * In either case, msg points to an appropriate message.
1116 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
1127 struct wordlist *addrs = NULL, *opts = NULL;
1128 char passwd[256], user[256];
1129 char secret[MAXWORDLEN];
1130 static int attempts = 0;
1133 * Make copies of apasswd and auser, then null-terminate them.
1134 * If there are unprintable characters in the password, make
1137 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1138 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1142 * Check if a plugin wants to handle this.
1144 if (pap_auth_hook) {
1145 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1148 set_allowed_addrs(unit, addrs, opts);
1149 BZERO(passwd, sizeof(passwd));
1151 free_wordlist(addrs);
1153 free_wordlist(opts);
1155 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1160 * Open the file of pap secrets and scan for a suitable secret
1161 * for authenticating this user.
1163 filename = _PATH_UPAPFILE;
1164 addrs = opts = NULL;
1166 f = fopen(filename, "r");
1168 error("Can't open PAP password file %s: %m", filename);
1171 check_access(f, filename);
1172 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename) < 0) {
1173 warn("no PAP secret found for %s", user);
1176 * If the secret is "@login", it means to check
1177 * the password against the login database.
1179 int login_secret = strcmp(secret, "@login") == 0;
1181 if (uselogin || login_secret) {
1182 /* login option or secret is @login */
1183 ret = plogin(user, passwd, msg);
1184 if (ret == UPAP_AUTHNAK)
1185 warn("PAP login failure for %s", user);
1189 if (secret[0] != 0 && !login_secret) {
1190 /* password given in pap-secrets - must match */
1191 if ((cryptpap || strcmp(passwd, secret) != 0)
1192 && strcmp(crypt(passwd, secret), secret) != 0) {
1194 warn("PAP authentication failure for %s", user);
1201 if (ret == UPAP_AUTHNAK) {
1203 *msg = "Login incorrect";
1205 * XXX can we ever get here more than once??
1206 * Frustrate passwd stealer programs.
1207 * Allow 10 tries, but start backing off after 3 (stolen from login).
1208 * On 10'th, drop the connection.
1210 if (attempts++ >= 10) {
1211 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1212 lcp_close(unit, "login failed");
1215 sleep((u_int) (attempts - 3) * 5);
1217 free_wordlist(opts);
1220 attempts = 0; /* Reset count */
1223 set_allowed_addrs(unit, addrs, opts);
1227 free_wordlist(addrs);
1228 BZERO(passwd, sizeof(passwd));
1229 BZERO(secret, sizeof(secret));
1235 * This function is needed for PAM.
1239 /* Static variables used to communicate between the conversation function
1240 * and the server_login function
1242 static char *PAM_username;
1243 static char *PAM_password;
1244 static int PAM_error = 0;
1245 static pam_handle_t *pamh = NULL;
1247 /* PAM conversation function
1248 * Here we assume (for now, at least) that echo on means login name, and
1249 * echo off means password.
1252 static int PAM_conv (int num_msg, const struct pam_message **msg,
1253 struct pam_response **resp, void *appdata_ptr)
1256 struct pam_response *reply = NULL;
1258 #define COPY_STRING(s) (s) ? strdup(s) : NULL
1260 reply = malloc(sizeof(struct pam_response) * num_msg);
1261 if (!reply) return PAM_CONV_ERR;
1263 for (replies = 0; replies < num_msg; replies++) {
1264 switch (msg[replies]->msg_style) {
1265 case PAM_PROMPT_ECHO_ON:
1266 reply[replies].resp_retcode = PAM_SUCCESS;
1267 reply[replies].resp = COPY_STRING(PAM_username);
1268 /* PAM frees resp */
1270 case PAM_PROMPT_ECHO_OFF:
1271 reply[replies].resp_retcode = PAM_SUCCESS;
1272 reply[replies].resp = COPY_STRING(PAM_password);
1273 /* PAM frees resp */
1278 /* ignore it, but pam still wants a NULL response... */
1279 reply[replies].resp_retcode = PAM_SUCCESS;
1280 reply[replies].resp = NULL;
1283 /* Must be an error of some sort... */
1286 return PAM_CONV_ERR;
1293 static struct pam_conv PAM_conversation = {
1297 #endif /* USE_PAM */
1300 * plogin - Check the user name and password against the system
1301 * password database, and login the user if OK.
1304 * UPAP_AUTHNAK: Login failed.
1305 * UPAP_AUTHACK: Login succeeded.
1306 * In either case, msg points to an appropriate message.
1310 plogin(user, passwd, msg)
1320 pam_error = pam_start ("ppp", user, &PAM_conversation, &pamh);
1321 if (pam_error != PAM_SUCCESS) {
1322 *msg = (char *) pam_strerror (pamh, pam_error);
1324 return UPAP_AUTHNAK;
1327 * Define the fields for the credential validation
1330 PAM_username = user;
1331 PAM_password = passwd;
1333 pam_set_item (pamh, PAM_TTY, devnam); /* this might be useful to some modules */
1338 pam_error = pam_authenticate (pamh, PAM_SILENT);
1339 if (pam_error == PAM_SUCCESS && !PAM_error) {
1340 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
1341 if (pam_error == PAM_SUCCESS)
1342 pam_error = pam_open_session (pamh, PAM_SILENT);
1345 *msg = (char *) pam_strerror (pamh, pam_error);
1350 reopen_log(); /* apparently the PAM stuff does closelog() */
1351 PAM_username = NULL;
1352 PAM_password = NULL;
1353 if (pam_error != PAM_SUCCESS)
1354 return UPAP_AUTHNAK;
1355 #else /* #ifdef USE_PAM */
1358 * Use the non-PAM methods directly
1363 struct spwd *getspnam();
1365 struct passwd *pw = getpwnam(user);
1369 return (UPAP_AUTHNAK);
1372 spwd = getspnam(user);
1375 /* check the age of the password entry */
1376 long now = time(NULL) / 86400L;
1378 if ((spwd->sp_expire > 0 && now >= spwd->sp_expire)
1379 || ((spwd->sp_max >= 0 && spwd->sp_max < 10000)
1380 && spwd->sp_lstchg >= 0
1381 && now >= spwd->sp_lstchg + spwd->sp_max)) {
1382 warn("Password for %s has expired", user);
1383 return (UPAP_AUTHNAK);
1385 pw->pw_passwd = spwd->sp_pwdp;
1390 * If no passwd, don't let them login.
1392 if (pw->pw_passwd == NULL || strlen(pw->pw_passwd) < 2
1393 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
1394 return (UPAP_AUTHNAK);
1396 #endif /* #ifdef USE_PAM */
1399 * Write a wtmp entry for this user.
1403 if (strncmp(tty, "/dev/", 5) == 0)
1405 logwtmp(tty, user, ifname); /* Add wtmp login entry */
1407 #if defined(_PATH_LASTLOG) && !defined(USE_PAM)
1408 if (pw != (struct passwd *)NULL) {
1412 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1413 (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
1414 memset((void *)&ll, 0, sizeof(ll));
1415 (void)time(&ll.ll_time);
1416 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
1417 (void)write(fd, (char *)&ll, sizeof(ll));
1421 #endif /* _PATH_LASTLOG and not USE_PAM */
1423 info("user %s logged in", user);
1426 return (UPAP_AUTHACK);
1430 * plogout - Logout the user.
1439 pam_error = pam_close_session (pamh, PAM_SILENT);
1440 pam_end (pamh, pam_error);
1443 /* Apparently the pam stuff does closelog(). */
1445 #else /* ! USE_PAM */
1449 if (strncmp(tty, "/dev/", 5) == 0)
1451 logwtmp(tty, "", ""); /* Wipe out utmp logout entry */
1452 #endif /* ! USE_PAM */
1458 * null_login - Check if a username of "" and a password of "" are
1459 * acceptable, and iff so, set the list of acceptable IP addresses
1469 struct wordlist *addrs, *opts;
1470 char secret[MAXWORDLEN];
1473 * Check if a plugin wants to handle this.
1477 ret = (*null_auth_hook)(&addrs, &opts);
1480 * Open the file of pap secrets and scan for a suitable secret.
1483 filename = _PATH_UPAPFILE;
1485 f = fopen(filename, "r");
1488 check_access(f, filename);
1490 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename);
1491 ret = i >= 0 && secret[0] == 0;
1492 BZERO(secret, sizeof(secret));
1497 set_allowed_addrs(unit, addrs, opts);
1499 free_wordlist(opts);
1501 free_wordlist(addrs);
1508 * get_pap_passwd - get a password for authenticating ourselves with
1509 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1511 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1514 get_pap_passwd(passwd)
1520 char secret[MAXWORDLEN];
1523 * Check whether a plugin wants to supply this.
1525 if (pap_passwd_hook) {
1526 ret = (*pap_passwd_hook)(user, passwd);
1531 filename = _PATH_UPAPFILE;
1532 f = fopen(filename, "r");
1535 check_access(f, filename);
1536 ret = scan_authfile(f, user,
1537 (remote_name[0]? remote_name: NULL),
1538 secret, NULL, NULL, filename);
1543 strlcpy(passwd, secret, MAXSECRETLEN);
1544 BZERO(secret, sizeof(secret));
1550 * have_pap_secret - check whether we have a PAP file with any
1551 * secrets that we could possibly use for authenticating the peer.
1554 have_pap_secret(lacks_ipp)
1560 struct wordlist *addrs;
1562 /* let the plugin decide, if there is one */
1563 if (pap_check_hook) {
1564 ret = (*pap_check_hook)();
1569 filename = _PATH_UPAPFILE;
1570 f = fopen(filename, "r");
1574 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1575 NULL, &addrs, NULL, filename);
1577 if (ret >= 0 && !some_ip_ok(addrs)) {
1583 free_wordlist(addrs);
1590 * have_chap_secret - check whether we have a CHAP file with a
1591 * secret that we could possibly use for authenticating `client'
1592 * on `server'. Either can be the null string, meaning we don't
1593 * know the identity yet.
1596 have_chap_secret(client, server, need_ip, lacks_ipp)
1605 struct wordlist *addrs;
1607 if (chap_check_hook) {
1608 ret = (*chap_check_hook)();
1614 filename = _PATH_CHAPFILE;
1615 f = fopen(filename, "r");
1619 if (client != NULL && client[0] == 0)
1621 else if (server != NULL && server[0] == 0)
1624 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename);
1626 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1632 free_wordlist(addrs);
1639 * get_secret - open the CHAP secret file and return the secret
1640 * for authenticating the given client on the given server.
1641 * (We could be either client or server).
1644 get_secret(unit, client, server, secret, secret_len, am_server)
1655 struct wordlist *addrs, *opts;
1656 char secbuf[MAXWORDLEN];
1658 if (!am_server && passwd[0] != 0) {
1659 strlcpy(secbuf, passwd, sizeof(secbuf));
1660 } else if (!am_server && chap_passwd_hook) {
1661 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1662 error("Unable to obtain CHAP password for %s on %s from plugin",
1667 filename = _PATH_CHAPFILE;
1671 f = fopen(filename, "r");
1673 error("Can't open chap secret file %s: %m", filename);
1676 check_access(f, filename);
1678 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename);
1684 set_allowed_addrs(unit, addrs, opts);
1686 free_wordlist(opts);
1688 free_wordlist(addrs);
1691 len = strlen(secbuf);
1692 if (len > MAXSECRETLEN) {
1693 error("Secret for %s on %s is too long", client, server);
1696 BCOPY(secbuf, secret, len);
1697 BZERO(secbuf, sizeof(secbuf));
1704 * set_allowed_addrs() - set the list of allowed addresses.
1705 * Also looks for `--' indicating options to apply for this peer
1706 * and leaves the following words in extra_options.
1709 set_allowed_addrs(unit, addrs, opts)
1711 struct wordlist *addrs;
1712 struct wordlist *opts;
1715 struct wordlist *ap, **plink;
1716 struct permitted_ip *ip;
1717 char *ptr_word, *ptr_mask;
1720 u_int32_t a, mask, ah, offset;
1721 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1722 u_int32_t suggested_ip = 0;
1724 if (addresses[unit] != NULL)
1725 free(addresses[unit]);
1726 addresses[unit] = NULL;
1727 if (extra_options != NULL)
1728 free_wordlist(extra_options);
1729 extra_options = opts;
1732 * Count the number of IP addresses given.
1734 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
1737 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
1741 /* temporarily append the noauth_addrs list to addrs */
1742 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
1744 *plink = noauth_addrs;
1747 for (ap = addrs; ap != NULL; ap = ap->next) {
1748 /* "-" means no addresses authorized, "*" means any address allowed */
1749 ptr_word = ap->word;
1750 if (strcmp(ptr_word, "-") == 0)
1752 if (strcmp(ptr_word, "*") == 0) {
1754 ip[n].base = ip[n].mask = 0;
1760 if (*ptr_word == '!') {
1765 mask = ~ (u_int32_t) 0;
1767 ptr_mask = strchr (ptr_word, '/');
1768 if (ptr_mask != NULL) {
1772 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
1773 if (bit_count <= 0 || bit_count > 32) {
1774 warn("invalid address length %v in auth. address list",
1778 bit_count = 32 - bit_count; /* # bits in host part */
1780 offset = ifunit + 1;
1784 warn("invalid address length syntax: %v", ptr_mask+1);
1791 hp = gethostbyname(ptr_word);
1792 if (hp != NULL && hp->h_addrtype == AF_INET) {
1793 a = *(u_int32_t *)hp->h_addr;
1795 np = getnetbyname (ptr_word);
1796 if (np != NULL && np->n_addrtype == AF_INET) {
1797 a = htonl (*(u_int32_t *)np->n_net);
1798 if (ptr_mask == NULL) {
1799 /* calculate appropriate mask for net */
1802 mask = IN_CLASSA_NET;
1803 else if (IN_CLASSB(ah))
1804 mask = IN_CLASSB_NET;
1805 else if (IN_CLASSC(ah))
1806 mask = IN_CLASSC_NET;
1809 a = inet_addr (ptr_word);
1813 if (ptr_mask != NULL)
1816 if (a == (u_int32_t)-1L) {
1817 warn("unknown host %s in auth. address list", ap->word);
1821 if (offset >= ~mask) {
1822 warn("interface unit %d too large for subnet %v",
1826 a = htonl((ntohl(a) & mask) + offset);
1827 mask = ~(u_int32_t)0;
1829 ip[n].mask = htonl(mask);
1830 ip[n].base = a & ip[n].mask;
1832 if (~mask == 0 && suggested_ip == 0)
1837 ip[n].permit = 0; /* make the last entry forbid all addresses */
1838 ip[n].base = 0; /* to terminate the list */
1841 addresses[unit] = ip;
1844 * If the address given for the peer isn't authorized, or if
1845 * the user hasn't given one, AND there is an authorized address
1846 * which is a single host, then use that if we find one.
1848 if (suggested_ip != 0
1849 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
1850 wo->hisaddr = suggested_ip;
1852 * Do we insist on this address? No, if there are other
1853 * addresses authorized than the suggested one.
1856 wo->accept_remote = 1;
1861 * auth_ip_addr - check whether the peer is authorized to use
1862 * a given IP address. Returns 1 if authorized, 0 otherwise.
1865 auth_ip_addr(unit, addr)
1871 /* don't allow loopback or multicast address */
1872 if (bad_ip_adrs(addr))
1875 if (allowed_address_hook) {
1876 ok = allowed_address_hook(addr);
1877 if (ok >= 0) return ok;
1880 if (addresses[unit] != NULL) {
1881 ok = ip_addr_check(addr, addresses[unit]);
1887 return 0; /* no addresses authorized */
1888 return allow_any_ip || privileged || !have_route_to(addr);
1892 ip_addr_check(addr, addrs)
1894 struct permitted_ip *addrs;
1897 if ((addr & addrs->mask) == addrs->base)
1898 return addrs->permit;
1902 * bad_ip_adrs - return 1 if the IP address is one we don't want
1903 * to use, such as an address in the loopback net or a multicast address.
1904 * addr is in network byte order.
1911 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1912 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1916 * some_ip_ok - check a wordlist to see if it authorizes any
1921 struct wordlist *addrs;
1923 for (; addrs != 0; addrs = addrs->next) {
1924 if (addrs->word[0] == '-')
1926 if (addrs->word[0] != '!')
1927 return 1; /* some IP address is allowed */
1933 * auth_number - check whether the remote number is allowed to connect.
1934 * Returns 1 if authorized, 0 otherwise.
1939 struct wordlist *wp = permitted_numbers;
1942 /* Allow all if no authorization list. */
1946 /* Allow if we have a match in the authorization list. */
1948 /* trailing '*' wildcard */
1949 l = strlen(wp->word);
1950 if ((wp->word)[l - 1] == '*')
1952 if (!strncasecmp(wp->word, remote_number, l))
1962 * check_access - complain if a secret file has too-liberal permissions.
1965 check_access(f, filename)
1971 if (fstat(fileno(f), &sbuf) < 0) {
1972 warn("cannot stat secret file %s: %m", filename);
1973 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
1974 warn("Warning - secret file %s has world and/or group access",
1981 * scan_authfile - Scan an authorization file for a secret suitable
1982 * for authenticating `client' on `server'. The return value is -1
1983 * if no secret is found, otherwise >= 0. The return value has
1984 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
1985 * NONWILD_SERVER set if the secret didn't have "*" for the server.
1986 * Any following words on the line up to a "--" (i.e. address authorization
1987 * info) are placed in a wordlist and returned in *addrs. Any
1988 * following words (extra options) are placed in a wordlist and
1989 * returned in *opts.
1990 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
1993 scan_authfile(f, client, server, secret, addrs, opts, filename)
1998 struct wordlist **addrs;
1999 struct wordlist **opts;
2003 int got_flag, best_flag;
2005 struct wordlist *ap, *addr_list, *alist, **app;
2006 char word[MAXWORDLEN];
2007 char atfile[MAXWORDLEN];
2008 char lsecret[MAXWORDLEN];
2015 if (!getword(f, word, &newline, filename))
2016 return -1; /* file is empty??? */
2021 * Skip until we find a word at the start of a line.
2023 while (!newline && getword(f, word, &newline, filename))
2026 break; /* got to end of file */
2029 * Got a client - check if it's a match or a wildcard.
2032 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2037 got_flag = NONWILD_CLIENT;
2040 * Now get a server and check if it matches.
2042 if (!getword(f, word, &newline, filename))
2046 if (!ISWILD(word)) {
2047 if (server != NULL && strcmp(word, server) != 0)
2049 got_flag |= NONWILD_SERVER;
2053 * Got some sort of a match - see if it's better than what
2056 if (got_flag <= best_flag)
2062 if (!getword(f, word, &newline, filename))
2067 if (secret != NULL) {
2069 * Special syntax: @/pathname means read secret from file.
2071 if (word[0] == '@' && word[1] == '/') {
2072 strlcpy(atfile, word+1, sizeof(atfile));
2073 if ((sf = fopen(atfile, "r")) == NULL) {
2074 warn("can't open indirect secret file %s", atfile);
2077 check_access(sf, atfile);
2078 if (!getword(sf, word, &xxx, atfile)) {
2079 warn("no secret in indirect secret file %s", atfile);
2085 strlcpy(lsecret, word, sizeof(lsecret));
2089 * Now read address authorization info and make a wordlist.
2093 if (!getword(f, word, &newline, filename) || newline)
2095 ap = (struct wordlist *)
2096 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2098 novm("authorized addresses");
2099 ap->word = (char *) (ap + 1);
2100 strcpy(ap->word, word);
2107 * This is the best so far; remember it.
2109 best_flag = got_flag;
2111 free_wordlist(addr_list);
2114 strlcpy(secret, lsecret, MAXWORDLEN);
2120 /* scan for a -- word indicating the start of options */
2121 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2122 if (strcmp(ap->word, "--") == 0)
2124 /* ap = start of options */
2126 ap = ap->next; /* first option */
2127 free(*app); /* free the "--" word */
2128 *app = NULL; /* terminate addr list */
2132 else if (ap != NULL)
2136 else if (addr_list != NULL)
2137 free_wordlist(addr_list);
2143 * wordlist_count - return the number of items in a wordlist
2147 struct wordlist *wp;
2151 for (n = 0; wp != NULL; wp = wp->next)
2157 * free_wordlist - release memory allocated for a wordlist.
2161 struct wordlist *wp;
2163 struct wordlist *next;
2165 while (wp != NULL) {
2173 * auth_script_done - called when the auth-up or auth-down script
2177 auth_script_done(arg)
2180 auth_script_pid = 0;
2181 switch (auth_script_state) {
2183 if (auth_state == s_down) {
2184 auth_script_state = s_down;
2185 auth_script(_PATH_AUTHDOWN);
2189 if (auth_state == s_up) {
2190 auth_script_state = s_up;
2191 auth_script(_PATH_AUTHUP);
2198 * auth_script - execute a script with arguments
2199 * interface-name peer-name real-user tty speed
2211 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2212 user_name = pw->pw_name;
2214 slprintf(struid, sizeof(struid), "%d", getuid());
2217 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2221 argv[2] = peer_authname;
2222 argv[3] = user_name;
2227 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);