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 1.90 2002/12/04 23:03:32 paulus 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){
432 option_error("unable to read user login data file %s", fname);
437 /* get rid of newlines */
439 if (l > 0 && u[l-1] == '\n')
442 if (l > 0 && p[l-1] == '\n')
445 if (override_value("user", option_priority, fname))
446 strlcpy(user, u, sizeof(user));
447 if (override_value("passwd", option_priority, fname))
448 strlcpy(passwd, p, sizeof(passwd));
455 * privgroup - allow members of the group to have privileged access.
466 option_error("group %s is unknown", *argv);
469 for (i = 0; i < ngroups; ++i) {
470 if (groups[i] == g->gr_gid) {
480 * set_noauth_addr - set address(es) that can be used without authentication.
481 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
484 set_noauth_addr(argv)
488 int l = strlen(addr) + 1;
491 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
493 novm("allow-ip argument");
494 wp->word = (char *) (wp + 1);
495 wp->next = noauth_addrs;
496 BCOPY(addr, wp->word, l);
503 * set_permitted_number - set remote telephone number(s) that may connect.
506 set_permitted_number(argv)
509 char *number = *argv;
510 int l = strlen(number) + 1;
513 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
515 novm("allow-number argument");
516 wp->word = (char *) (wp + 1);
517 wp->next = permitted_numbers;
518 BCOPY(number, wp->word, l);
519 permitted_numbers = wp;
525 * An Open on LCP has requested a change from Dead to Establish phase.
526 * Do what's necessary to bring the physical layer up.
535 * LCP has terminated the link; go to the Dead phase and take the
536 * physical layer down.
539 link_terminated(unit)
542 if (phase == PHASE_DEAD)
544 if (pap_logout_hook) {
550 new_phase(PHASE_DEAD);
551 notice("Connection terminated.");
555 * LCP has gone down; it will either die or try to re-establish.
562 struct protent *protp;
564 notify(link_down_notifier, 0);
566 if (auth_script_state == s_up && auth_script_pid == 0) {
567 update_link_stats(unit);
568 auth_script_state = s_down;
569 auth_script(_PATH_AUTHDOWN);
571 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
572 if (!protp->enabled_flag)
574 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
575 (*protp->lowerdown)(unit);
576 if (protp->protocol < 0xC000 && protp->close != NULL)
577 (*protp->close)(unit, "LCP down");
581 if (phase != PHASE_DEAD)
582 new_phase(PHASE_ESTABLISH);
586 * The link is established.
587 * Proceed to the Dead, Authenticate or Network phase as appropriate.
590 link_established(unit)
594 lcp_options *wo = &lcp_wantoptions[unit];
595 lcp_options *go = &lcp_gotoptions[unit];
596 lcp_options *ho = &lcp_hisoptions[unit];
598 struct protent *protp;
601 * Tell higher-level protocols that LCP is up.
603 for (i = 0; (protp = protocols[i]) != NULL; ++i)
604 if (protp->protocol != PPP_LCP && protp->enabled_flag
605 && protp->lowerup != NULL)
606 (*protp->lowerup)(unit);
608 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) {
610 * We wanted the peer to authenticate itself, and it refused:
611 * if we have some address(es) it can use without auth, fine,
612 * otherwise treat it as though it authenticated with PAP using
613 * a username of "" and a password of "". If that's not OK,
616 if (noauth_addrs != NULL) {
617 set_allowed_addrs(unit, NULL, NULL);
618 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
619 warn("peer refused to authenticate: terminating link");
620 lcp_close(unit, "peer refused to authenticate");
621 status = EXIT_PEER_AUTH_FAILED;
626 new_phase(PHASE_AUTHENTICATE);
630 eap_authpeer(unit, our_name);
632 } else if (go->neg_chap) {
633 ChapAuthPeer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
635 } else if (go->neg_upap) {
640 eap_authwithpeer(unit, user);
641 auth |= EAP_WITHPEER;
642 } else if (ho->neg_chap) {
643 ChapAuthWithPeer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
644 auth |= CHAP_WITHPEER;
645 } else if (ho->neg_upap) {
646 if (passwd[0] == 0) {
647 passwd_from_file = 1;
648 if (!get_pap_passwd(passwd))
649 error("No secret found for PAP login");
651 upap_authwithpeer(unit, user, passwd);
652 auth |= PAP_WITHPEER;
654 auth_pending[unit] = auth;
662 * Proceed to the network phase.
668 lcp_options *go = &lcp_gotoptions[unit];
670 /* Log calling number. */
672 notice("peer from calling number %q authorized", remote_number);
675 * If the peer had to authenticate, run the auth-up script now.
677 if (go->neg_chap || go->neg_upap || go->neg_eap) {
678 notify(auth_up_notifier, 0);
680 if (auth_script_state == s_down && auth_script_pid == 0) {
681 auth_script_state = s_up;
682 auth_script(_PATH_AUTHUP);
688 * If we negotiated callback, do it now.
691 new_phase(PHASE_CALLBACK);
692 (*cbcp_protent.open)(unit);
698 * Process extra options from the secrets file
701 options_from_list(extra_options, 1);
702 free_wordlist(extra_options);
705 start_networks(unit);
713 struct protent *protp;
714 int ecp_required, mppe_required;
716 new_phase(PHASE_NETWORK);
718 #ifdef HAVE_MULTILINK
720 if (mp_join_bundle()) {
721 if (updetach && !nodetach)
726 #endif /* HAVE_MULTILINK */
730 set_filters(&pass_filter, &active_filter);
732 /* Start CCP and ECP */
733 for (i = 0; (protp = protocols[i]) != NULL; ++i)
734 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
735 && protp->enabled_flag && protp->open != NULL)
739 * Bring up other network protocols iff encryption is not required.
741 ecp_required = ecp_gotoptions[unit].required;
742 mppe_required = ccp_gotoptions[unit].mppe;
743 if (!ecp_required && !mppe_required)
744 continue_networks(unit);
748 continue_networks(unit)
752 struct protent *protp;
755 * Start the "real" network protocols.
757 for (i = 0; (protp = protocols[i]) != NULL; ++i)
758 if (protp->protocol < 0xC000
759 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
760 && protp->enabled_flag && protp->open != NULL) {
765 if (num_np_open == 0)
767 lcp_close(0, "No network protocols running");
771 * The peer has failed to authenticate himself using `protocol'.
774 auth_peer_fail(unit, protocol)
778 * Authentication failure: take the link down
780 lcp_close(unit, "Authentication failed");
781 status = EXIT_PEER_AUTH_FAILED;
785 * The peer has been successfully authenticated using `protocol'.
788 auth_peer_success(unit, protocol, prot_flavor, name, namelen)
789 int unit, protocol, prot_flavor;
798 switch (prot_flavor) {
799 case CHAP_DIGEST_MD5:
800 bit |= CHAP_MD5_PEER;
806 case CHAP_MICROSOFT_V2:
807 bit |= CHAP_MS2_PEER;
819 warn("auth_peer_success: unknown protocol %x", protocol);
824 * Save the authenticated name of the peer for later.
826 if (namelen > sizeof(peer_authname) - 1)
827 namelen = sizeof(peer_authname) - 1;
828 BCOPY(name, peer_authname, namelen);
829 peer_authname[namelen] = 0;
830 script_setenv("PEERNAME", peer_authname, 0);
832 /* Save the authentication method for later. */
833 auth_done[unit] |= bit;
836 * If there is no more authentication still to be done,
837 * proceed to the network (or callback) phase.
839 if ((auth_pending[unit] &= ~bit) == 0)
844 * We have failed to authenticate ourselves to the peer using `protocol'.
847 auth_withpeer_fail(unit, protocol)
850 if (passwd_from_file)
851 BZERO(passwd, MAXSECRETLEN);
853 * We've failed to authenticate ourselves to our peer.
854 * Some servers keep sending CHAP challenges, but there
855 * is no point in persisting without any way to get updated
856 * authentication secrets.
858 lcp_close(unit, "Failed to authenticate ourselves to peer");
859 status = EXIT_AUTH_TOPEER_FAILED;
863 * We have successfully authenticated ourselves with the peer using `protocol'.
866 auth_withpeer_success(unit, protocol, prot_flavor)
867 int unit, protocol, prot_flavor;
874 switch (prot_flavor) {
875 case CHAP_DIGEST_MD5:
876 bit |= CHAP_MD5_WITHPEER;
880 bit |= CHAP_MS_WITHPEER;
882 case CHAP_MICROSOFT_V2:
883 bit |= CHAP_MS2_WITHPEER;
889 if (passwd_from_file)
890 BZERO(passwd, MAXSECRETLEN);
897 warn("auth_withpeer_success: unknown protocol %x", protocol);
901 /* Save the authentication method for later. */
902 auth_done[unit] |= bit;
905 * If there is no more authentication still being done,
906 * proceed to the network (or callback) phase.
908 if ((auth_pending[unit] &= ~bit) == 0)
914 * np_up - a network protocol has come up.
922 if (num_np_up == 0) {
924 * At this point we consider that the link has come up successfully.
928 new_phase(PHASE_RUNNING);
930 if (idle_time_hook != 0)
931 tlim = (*idle_time_hook)(NULL);
933 tlim = idle_time_limit;
935 TIMEOUT(check_idle, NULL, tlim);
938 * Set a timeout to close the connection once the maximum
939 * connect time has expired.
942 TIMEOUT(connect_time_expired, 0, maxconnect);
946 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
950 * Detach now, if the updetach option was given.
952 if (updetach && !nodetach)
959 * np_down - a network protocol has gone down.
965 if (--num_np_up == 0) {
966 UNTIMEOUT(check_idle, NULL);
967 UNTIMEOUT(connect_time_expired, NULL);
969 UNTIMEOUT(check_maxoctets, NULL);
971 new_phase(PHASE_NETWORK);
976 * np_finished - a network protocol has finished using the link.
979 np_finished(unit, proto)
982 if (--num_np_open <= 0) {
983 /* no further use for the link: shut up shop. */
984 lcp_close(0, "No network protocols running");
996 update_link_stats(ifunit);
999 switch(maxoctets_dir) {
1000 case PPP_OCTETS_DIRECTION_IN:
1001 used = link_stats.bytes_in;
1003 case PPP_OCTETS_DIRECTION_OUT:
1004 used = link_stats.bytes_out;
1006 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1007 case PPP_OCTETS_DIRECTION_MAXSESSION:
1008 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1011 used = link_stats.bytes_in+link_stats.bytes_out;
1014 diff = maxoctets - used;
1016 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1017 lcp_close(0, "Traffic limit");
1019 status = EXIT_TRAFFIC_LIMIT;
1021 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1027 * check_idle - check whether the link has been idle for long
1028 * enough that we can shut it down.
1034 struct ppp_idle idle;
1038 if (!get_idle_time(0, &idle))
1040 if (idle_time_hook != 0) {
1041 tlim = idle_time_hook(&idle);
1043 itime = MIN(idle.xmit_idle, idle.recv_idle);
1044 tlim = idle_time_limit - itime;
1047 /* link is idle: shut it down. */
1048 notice("Terminating connection due to lack of activity.");
1049 lcp_close(0, "Link inactive");
1051 status = EXIT_IDLE_TIMEOUT;
1053 TIMEOUT(check_idle, NULL, tlim);
1058 * connect_time_expired - log a message and close the connection.
1061 connect_time_expired(arg)
1064 info("Connect time expired");
1065 lcp_close(0, "Connect time expired"); /* Close connection */
1066 status = EXIT_CONNECT_TIME;
1070 * auth_check_options - called to check authentication options.
1073 auth_check_options()
1075 lcp_options *wo = &lcp_wantoptions[0];
1079 /* Default our_name to hostname, and user to our_name */
1080 if (our_name[0] == 0 || usehostname)
1081 strlcpy(our_name, hostname, sizeof(our_name));
1083 strlcpy(user, our_name, sizeof(user));
1086 * If we have a default route, require the peer to authenticate
1087 * unless the noauth option was given or the real user is root.
1089 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1094 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1095 if (wo->chap_mdtype)
1098 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1099 if (auth_required) {
1101 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) {
1102 wo->neg_chap = 1; wo->chap_mdtype = MDTYPE_ALL;
1107 wo->neg_chap = 0; wo->chap_mdtype = MDTYPE_NONE;
1113 * Check whether we have appropriate secrets to use
1114 * to authenticate the peer. Note that EAP can authenticate by way
1115 * of a CHAP-like exchanges as well as SRP.
1118 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1119 if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
1120 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1121 our_name, 1, &lacks_ip);
1123 if (!can_auth && wo->neg_eap) {
1124 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1125 our_name, 1, &lacks_ip);
1128 if (auth_required && !can_auth && noauth_addrs == NULL) {
1131 "By default the remote system is required to authenticate itself");
1133 "(because this system has a default route to the internet)");
1134 } else if (explicit_remote)
1136 "The remote system (%s) is required to authenticate itself",
1140 "The remote system is required to authenticate itself");
1142 "but I couldn't find any suitable secret (password) for it to use to do so.");
1145 "(None of the available passwords would let it use an IP address.)");
1152 * auth_reset - called when LCP is starting negotiations to recheck
1153 * authentication options, i.e. whether we have appropriate secrets
1154 * to use for authenticating ourselves and/or the peer.
1160 lcp_options *go = &lcp_gotoptions[unit];
1161 lcp_options *ao = &lcp_allowoptions[unit];
1165 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1166 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1167 && (passwd[0] != 0 ||
1168 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1170 ao->neg_eap = !refuse_eap && (
1172 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1173 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1174 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL));
1177 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1180 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1181 our_name, 1, NULL)))
1185 (hadchap == 0 || (hadchap == -1 &&
1186 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1188 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1195 * check_passwd - Check the user name and passwd against the PAP secrets
1196 * file. If requested, also check against the system password database,
1197 * and login the user if OK.
1200 * UPAP_AUTHNAK: Authentication failed.
1201 * UPAP_AUTHACK: Authentication succeeded.
1202 * In either case, msg points to an appropriate message.
1205 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
1216 struct wordlist *addrs = NULL, *opts = NULL;
1217 char passwd[256], user[256];
1218 char secret[MAXWORDLEN];
1219 static int attempts = 0;
1222 * Make copies of apasswd and auser, then null-terminate them.
1223 * If there are unprintable characters in the password, make
1226 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1227 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1231 * Check if a plugin wants to handle this.
1233 if (pap_auth_hook) {
1234 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1237 set_allowed_addrs(unit, addrs, opts);
1238 BZERO(passwd, sizeof(passwd));
1240 free_wordlist(addrs);
1242 free_wordlist(opts);
1244 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1249 * Open the file of pap secrets and scan for a suitable secret
1250 * for authenticating this user.
1252 filename = _PATH_UPAPFILE;
1253 addrs = opts = NULL;
1255 f = fopen(filename, "r");
1257 error("Can't open PAP password file %s: %m", filename);
1260 check_access(f, filename);
1261 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1262 warn("no PAP secret found for %s", user);
1265 * If the secret is "@login", it means to check
1266 * the password against the login database.
1268 int login_secret = strcmp(secret, "@login") == 0;
1270 if (uselogin || login_secret) {
1271 /* login option or secret is @login */
1272 if ((ret = plogin(user, passwd, msg)) == UPAP_AUTHACK)
1275 if (secret[0] != 0 && !login_secret) {
1276 /* password given in pap-secrets - must match */
1277 if ((cryptpap || strcmp(passwd, secret) != 0)
1278 && strcmp(crypt(passwd, secret), secret) != 0)
1285 if (ret == UPAP_AUTHNAK) {
1287 *msg = "Login incorrect";
1289 * XXX can we ever get here more than once??
1290 * Frustrate passwd stealer programs.
1291 * Allow 10 tries, but start backing off after 3 (stolen from login).
1292 * On 10'th, drop the connection.
1294 if (attempts++ >= 10) {
1295 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1296 lcp_close(unit, "login failed");
1299 sleep((u_int) (attempts - 3) * 5);
1301 free_wordlist(opts);
1304 attempts = 0; /* Reset count */
1307 set_allowed_addrs(unit, addrs, opts);
1311 free_wordlist(addrs);
1312 BZERO(passwd, sizeof(passwd));
1313 BZERO(secret, sizeof(secret));
1319 * This function is needed for PAM.
1323 /* Static variables used to communicate between the conversation function
1324 * and the server_login function
1326 static char *PAM_username;
1327 static char *PAM_password;
1328 static int PAM_error = 0;
1329 static pam_handle_t *pamh = NULL;
1331 /* PAM conversation function
1332 * Here we assume (for now, at least) that echo on means login name, and
1333 * echo off means password.
1336 static int PAM_conv (int num_msg,
1340 struct pam_message **msg,
1341 struct pam_response **resp, void *appdata_ptr)
1344 struct pam_response *reply = NULL;
1346 #define COPY_STRING(s) (s) ? strdup(s) : NULL
1348 reply = malloc(sizeof(struct pam_response) * num_msg);
1349 if (!reply) return PAM_CONV_ERR;
1351 for (replies = 0; replies < num_msg; replies++) {
1352 switch (msg[replies]->msg_style) {
1353 case PAM_PROMPT_ECHO_ON:
1354 reply[replies].resp_retcode = PAM_SUCCESS;
1355 reply[replies].resp = COPY_STRING(PAM_username);
1356 /* PAM frees resp */
1358 case PAM_PROMPT_ECHO_OFF:
1359 reply[replies].resp_retcode = PAM_SUCCESS;
1360 reply[replies].resp = COPY_STRING(PAM_password);
1361 /* PAM frees resp */
1366 /* ignore it, but pam still wants a NULL response... */
1367 reply[replies].resp_retcode = PAM_SUCCESS;
1368 reply[replies].resp = NULL;
1371 /* Must be an error of some sort... */
1374 return PAM_CONV_ERR;
1381 static struct pam_conv PAM_conversation = {
1385 #endif /* USE_PAM */
1388 * plogin - Check the user name and password against the system
1389 * password database, and login the user if OK.
1392 * UPAP_AUTHNAK: Login failed.
1393 * UPAP_AUTHACK: Login succeeded.
1394 * In either case, msg points to an appropriate message.
1398 plogin(user, passwd, msg)
1408 pam_error = pam_start ("ppp", user, &PAM_conversation, &pamh);
1409 if (pam_error != PAM_SUCCESS) {
1410 *msg = (char *) pam_strerror (pamh, pam_error);
1412 return UPAP_AUTHNAK;
1415 * Define the fields for the credential validation
1418 PAM_username = user;
1419 PAM_password = passwd;
1421 pam_set_item (pamh, PAM_TTY, devnam); /* this might be useful to some modules */
1426 pam_error = pam_authenticate (pamh, PAM_SILENT);
1427 if (pam_error == PAM_SUCCESS && !PAM_error) {
1428 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
1429 if (pam_error == PAM_SUCCESS)
1430 pam_error = pam_open_session (pamh, PAM_SILENT);
1433 *msg = (char *) pam_strerror (pamh, pam_error);
1438 reopen_log(); /* apparently the PAM stuff does closelog() */
1439 PAM_username = NULL;
1440 PAM_password = NULL;
1441 if (pam_error != PAM_SUCCESS)
1442 return UPAP_AUTHNAK;
1443 #else /* #ifdef USE_PAM */
1446 * Use the non-PAM methods directly
1451 struct spwd *getspnam();
1453 struct passwd *pw = getpwnam(user);
1457 return (UPAP_AUTHNAK);
1460 spwd = getspnam(user);
1463 /* check the age of the password entry */
1464 long now = time(NULL) / 86400L;
1466 if ((spwd->sp_expire > 0 && now >= spwd->sp_expire)
1467 || ((spwd->sp_max >= 0 && spwd->sp_max < 10000)
1468 && spwd->sp_lstchg >= 0
1469 && now >= spwd->sp_lstchg + spwd->sp_max)) {
1470 warn("Password for %s has expired", user);
1471 return (UPAP_AUTHNAK);
1473 pw->pw_passwd = spwd->sp_pwdp;
1478 * If no passwd, don't let them login.
1480 if (pw->pw_passwd == NULL || strlen(pw->pw_passwd) < 2
1481 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
1482 return (UPAP_AUTHNAK);
1484 #endif /* #ifdef USE_PAM */
1487 * Write a wtmp entry for this user.
1491 if (strncmp(tty, "/dev/", 5) == 0)
1493 logwtmp(tty, user, ifname); /* Add wtmp login entry */
1495 #if defined(_PATH_LASTLOG) && !defined(USE_PAM)
1496 if (pw != (struct passwd *)NULL) {
1500 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
1501 (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
1502 memset((void *)&ll, 0, sizeof(ll));
1503 (void)time(&ll.ll_time);
1504 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
1505 (void)write(fd, (char *)&ll, sizeof(ll));
1509 #endif /* _PATH_LASTLOG and not USE_PAM */
1511 info("user %s logged in", user);
1514 return (UPAP_AUTHACK);
1518 * plogout - Logout the user.
1527 pam_error = pam_close_session (pamh, PAM_SILENT);
1528 pam_end (pamh, pam_error);
1531 /* Apparently the pam stuff does closelog(). */
1533 #else /* ! USE_PAM */
1537 if (strncmp(tty, "/dev/", 5) == 0)
1539 logwtmp(tty, "", ""); /* Wipe out utmp logout entry */
1540 #endif /* ! USE_PAM */
1546 * null_login - Check if a username of "" and a password of "" are
1547 * acceptable, and iff so, set the list of acceptable IP addresses
1557 struct wordlist *addrs, *opts;
1558 char secret[MAXWORDLEN];
1561 * Check if a plugin wants to handle this.
1565 ret = (*null_auth_hook)(&addrs, &opts);
1568 * Open the file of pap secrets and scan for a suitable secret.
1571 filename = _PATH_UPAPFILE;
1573 f = fopen(filename, "r");
1576 check_access(f, filename);
1578 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1579 ret = i >= 0 && secret[0] == 0;
1580 BZERO(secret, sizeof(secret));
1585 set_allowed_addrs(unit, addrs, opts);
1587 free_wordlist(opts);
1589 free_wordlist(addrs);
1596 * get_pap_passwd - get a password for authenticating ourselves with
1597 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1599 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1602 get_pap_passwd(passwd)
1608 char secret[MAXWORDLEN];
1611 * Check whether a plugin wants to supply this.
1613 if (pap_passwd_hook) {
1614 ret = (*pap_passwd_hook)(user, passwd);
1619 filename = _PATH_UPAPFILE;
1620 f = fopen(filename, "r");
1623 check_access(f, filename);
1624 ret = scan_authfile(f, user,
1625 (remote_name[0]? remote_name: NULL),
1626 secret, NULL, NULL, filename, 0);
1631 strlcpy(passwd, secret, MAXSECRETLEN);
1632 BZERO(secret, sizeof(secret));
1638 * have_pap_secret - check whether we have a PAP file with any
1639 * secrets that we could possibly use for authenticating the peer.
1642 have_pap_secret(lacks_ipp)
1648 struct wordlist *addrs;
1650 /* let the plugin decide, if there is one */
1651 if (pap_check_hook) {
1652 ret = (*pap_check_hook)();
1657 filename = _PATH_UPAPFILE;
1658 f = fopen(filename, "r");
1662 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1663 NULL, &addrs, NULL, filename, 0);
1665 if (ret >= 0 && !some_ip_ok(addrs)) {
1671 free_wordlist(addrs);
1678 * have_chap_secret - check whether we have a CHAP file with a
1679 * secret that we could possibly use for authenticating `client'
1680 * on `server'. Either can be the null string, meaning we don't
1681 * know the identity yet.
1684 have_chap_secret(client, server, need_ip, lacks_ipp)
1693 struct wordlist *addrs;
1695 if (chap_check_hook) {
1696 ret = (*chap_check_hook)();
1702 filename = _PATH_CHAPFILE;
1703 f = fopen(filename, "r");
1707 if (client != NULL && client[0] == 0)
1709 else if (server != NULL && server[0] == 0)
1712 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1714 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1720 free_wordlist(addrs);
1727 * have_srp_secret - check whether we have a SRP file with a
1728 * secret that we could possibly use for authenticating `client'
1729 * on `server'. Either can be the null string, meaning we don't
1730 * know the identity yet.
1733 have_srp_secret(client, server, need_ip, lacks_ipp)
1742 struct wordlist *addrs;
1744 filename = _PATH_SRPFILE;
1745 f = fopen(filename, "r");
1749 if (client != NULL && client[0] == 0)
1751 else if (server != NULL && server[0] == 0)
1754 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1756 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1762 free_wordlist(addrs);
1769 * get_secret - open the CHAP secret file and return the secret
1770 * for authenticating the given client on the given server.
1771 * (We could be either client or server).
1774 get_secret(unit, client, server, secret, secret_len, am_server)
1785 struct wordlist *addrs, *opts;
1786 char secbuf[MAXWORDLEN];
1788 if (!am_server && passwd[0] != 0) {
1789 strlcpy(secbuf, passwd, sizeof(secbuf));
1790 } else if (!am_server && chap_passwd_hook) {
1791 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1792 error("Unable to obtain CHAP password for %s on %s from plugin",
1797 filename = _PATH_CHAPFILE;
1801 f = fopen(filename, "r");
1803 error("Can't open chap secret file %s: %m", filename);
1806 check_access(f, filename);
1808 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1814 set_allowed_addrs(unit, addrs, opts);
1816 free_wordlist(opts);
1818 free_wordlist(addrs);
1821 len = strlen(secbuf);
1822 if (len > MAXSECRETLEN) {
1823 error("Secret for %s on %s is too long", client, server);
1826 BCOPY(secbuf, secret, len);
1827 BZERO(secbuf, sizeof(secbuf));
1835 * get_srp_secret - open the SRP secret file and return the secret
1836 * for authenticating the given client on the given server.
1837 * (We could be either client or server).
1840 get_srp_secret(unit, client, server, secret, am_server)
1850 struct wordlist *addrs, *opts;
1852 if (!am_server && passwd[0] != '\0') {
1853 strlcpy(secret, passwd, MAXWORDLEN);
1855 filename = _PATH_SRPFILE;
1858 fp = fopen(filename, "r");
1860 error("Can't open srp secret file %s: %m", filename);
1863 check_access(fp, filename);
1866 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
1867 filename, am_server);
1873 set_allowed_addrs(unit, addrs, opts);
1874 else if (opts != NULL)
1875 free_wordlist(opts);
1877 free_wordlist(addrs);
1884 * set_allowed_addrs() - set the list of allowed addresses.
1885 * Also looks for `--' indicating options to apply for this peer
1886 * and leaves the following words in extra_options.
1889 set_allowed_addrs(unit, addrs, opts)
1891 struct wordlist *addrs;
1892 struct wordlist *opts;
1895 struct wordlist *ap, **plink;
1896 struct permitted_ip *ip;
1897 char *ptr_word, *ptr_mask;
1900 u_int32_t a, mask, ah, offset;
1901 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1902 u_int32_t suggested_ip = 0;
1904 if (addresses[unit] != NULL)
1905 free(addresses[unit]);
1906 addresses[unit] = NULL;
1907 if (extra_options != NULL)
1908 free_wordlist(extra_options);
1909 extra_options = opts;
1912 * Count the number of IP addresses given.
1914 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
1917 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
1921 /* temporarily append the noauth_addrs list to addrs */
1922 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
1924 *plink = noauth_addrs;
1927 for (ap = addrs; ap != NULL; ap = ap->next) {
1928 /* "-" means no addresses authorized, "*" means any address allowed */
1929 ptr_word = ap->word;
1930 if (strcmp(ptr_word, "-") == 0)
1932 if (strcmp(ptr_word, "*") == 0) {
1934 ip[n].base = ip[n].mask = 0;
1940 if (*ptr_word == '!') {
1945 mask = ~ (u_int32_t) 0;
1947 ptr_mask = strchr (ptr_word, '/');
1948 if (ptr_mask != NULL) {
1952 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
1953 if (bit_count <= 0 || bit_count > 32) {
1954 warn("invalid address length %v in auth. address list",
1958 bit_count = 32 - bit_count; /* # bits in host part */
1960 offset = ifunit + 1;
1964 warn("invalid address length syntax: %v", ptr_mask+1);
1971 hp = gethostbyname(ptr_word);
1972 if (hp != NULL && hp->h_addrtype == AF_INET) {
1973 a = *(u_int32_t *)hp->h_addr;
1975 np = getnetbyname (ptr_word);
1976 if (np != NULL && np->n_addrtype == AF_INET) {
1977 a = htonl (*(u_int32_t *)np->n_net);
1978 if (ptr_mask == NULL) {
1979 /* calculate appropriate mask for net */
1982 mask = IN_CLASSA_NET;
1983 else if (IN_CLASSB(ah))
1984 mask = IN_CLASSB_NET;
1985 else if (IN_CLASSC(ah))
1986 mask = IN_CLASSC_NET;
1989 a = inet_addr (ptr_word);
1993 if (ptr_mask != NULL)
1996 if (a == (u_int32_t)-1L) {
1997 warn("unknown host %s in auth. address list", ap->word);
2001 if (offset >= ~mask) {
2002 warn("interface unit %d too large for subnet %v",
2006 a = htonl((ntohl(a) & mask) + offset);
2007 mask = ~(u_int32_t)0;
2009 ip[n].mask = htonl(mask);
2010 ip[n].base = a & ip[n].mask;
2012 if (~mask == 0 && suggested_ip == 0)
2017 ip[n].permit = 0; /* make the last entry forbid all addresses */
2018 ip[n].base = 0; /* to terminate the list */
2021 addresses[unit] = ip;
2024 * If the address given for the peer isn't authorized, or if
2025 * the user hasn't given one, AND there is an authorized address
2026 * which is a single host, then use that if we find one.
2028 if (suggested_ip != 0
2029 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2030 wo->hisaddr = suggested_ip;
2032 * Do we insist on this address? No, if there are other
2033 * addresses authorized than the suggested one.
2036 wo->accept_remote = 1;
2041 * auth_ip_addr - check whether the peer is authorized to use
2042 * a given IP address. Returns 1 if authorized, 0 otherwise.
2045 auth_ip_addr(unit, addr)
2051 /* don't allow loopback or multicast address */
2052 if (bad_ip_adrs(addr))
2055 if (allowed_address_hook) {
2056 ok = allowed_address_hook(addr);
2057 if (ok >= 0) return ok;
2060 if (addresses[unit] != NULL) {
2061 ok = ip_addr_check(addr, addresses[unit]);
2067 return 0; /* no addresses authorized */
2068 return allow_any_ip || privileged || !have_route_to(addr);
2072 ip_addr_check(addr, addrs)
2074 struct permitted_ip *addrs;
2077 if ((addr & addrs->mask) == addrs->base)
2078 return addrs->permit;
2082 * bad_ip_adrs - return 1 if the IP address is one we don't want
2083 * to use, such as an address in the loopback net or a multicast address.
2084 * addr is in network byte order.
2091 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2092 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2096 * some_ip_ok - check a wordlist to see if it authorizes any
2101 struct wordlist *addrs;
2103 for (; addrs != 0; addrs = addrs->next) {
2104 if (addrs->word[0] == '-')
2106 if (addrs->word[0] != '!')
2107 return 1; /* some IP address is allowed */
2113 * auth_number - check whether the remote number is allowed to connect.
2114 * Returns 1 if authorized, 0 otherwise.
2119 struct wordlist *wp = permitted_numbers;
2122 /* Allow all if no authorization list. */
2126 /* Allow if we have a match in the authorization list. */
2128 /* trailing '*' wildcard */
2129 l = strlen(wp->word);
2130 if ((wp->word)[l - 1] == '*')
2132 if (!strncasecmp(wp->word, remote_number, l))
2141 * check_access - complain if a secret file has too-liberal permissions.
2144 check_access(f, filename)
2150 if (fstat(fileno(f), &sbuf) < 0) {
2151 warn("cannot stat secret file %s: %m", filename);
2152 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2153 warn("Warning - secret file %s has world and/or group access",
2160 * scan_authfile - Scan an authorization file for a secret suitable
2161 * for authenticating `client' on `server'. The return value is -1
2162 * if no secret is found, otherwise >= 0. The return value has
2163 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2164 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2165 * Any following words on the line up to a "--" (i.e. address authorization
2166 * info) are placed in a wordlist and returned in *addrs. Any
2167 * following words (extra options) are placed in a wordlist and
2168 * returned in *opts.
2169 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2170 * Flags are non-zero if we need two colons in the secret in order to
2174 scan_authfile(f, client, server, secret, addrs, opts, filename, flags)
2179 struct wordlist **addrs;
2180 struct wordlist **opts;
2185 int got_flag, best_flag;
2187 struct wordlist *ap, *addr_list, *alist, **app;
2188 char word[MAXWORDLEN];
2189 char atfile[MAXWORDLEN];
2190 char lsecret[MAXWORDLEN];
2198 if (!getword(f, word, &newline, filename))
2199 return -1; /* file is empty??? */
2204 * Skip until we find a word at the start of a line.
2206 while (!newline && getword(f, word, &newline, filename))
2209 break; /* got to end of file */
2212 * Got a client - check if it's a match or a wildcard.
2215 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2220 got_flag = NONWILD_CLIENT;
2223 * Now get a server and check if it matches.
2225 if (!getword(f, word, &newline, filename))
2229 if (!ISWILD(word)) {
2230 if (server != NULL && strcmp(word, server) != 0)
2232 got_flag |= NONWILD_SERVER;
2236 * Got some sort of a match - see if it's better than what
2239 if (got_flag <= best_flag)
2245 if (!getword(f, word, &newline, filename))
2251 * SRP-SHA1 authenticator should never be reading secrets from
2252 * a file. (Authenticatee may, though.)
2254 if (flags && ((cp = strchr(word, ':')) == NULL ||
2255 strchr(cp + 1, ':') == NULL))
2258 if (secret != NULL) {
2260 * Special syntax: @/pathname means read secret from file.
2262 if (word[0] == '@' && word[1] == '/') {
2263 strlcpy(atfile, word+1, sizeof(atfile));
2264 if ((sf = fopen(atfile, "r")) == NULL) {
2265 warn("can't open indirect secret file %s", atfile);
2268 check_access(sf, atfile);
2269 if (!getword(sf, word, &xxx, atfile)) {
2270 warn("no secret in indirect secret file %s", atfile);
2276 strlcpy(lsecret, word, sizeof(lsecret));
2280 * Now read address authorization info and make a wordlist.
2284 if (!getword(f, word, &newline, filename) || newline)
2286 ap = (struct wordlist *)
2287 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2289 novm("authorized addresses");
2290 ap->word = (char *) (ap + 1);
2291 strcpy(ap->word, word);
2298 * This is the best so far; remember it.
2300 best_flag = got_flag;
2302 free_wordlist(addr_list);
2305 strlcpy(secret, lsecret, MAXWORDLEN);
2311 /* scan for a -- word indicating the start of options */
2312 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2313 if (strcmp(ap->word, "--") == 0)
2315 /* ap = start of options */
2317 ap = ap->next; /* first option */
2318 free(*app); /* free the "--" word */
2319 *app = NULL; /* terminate addr list */
2323 else if (ap != NULL)
2327 else if (addr_list != NULL)
2328 free_wordlist(addr_list);
2334 * wordlist_count - return the number of items in a wordlist
2338 struct wordlist *wp;
2342 for (n = 0; wp != NULL; wp = wp->next)
2348 * free_wordlist - release memory allocated for a wordlist.
2352 struct wordlist *wp;
2354 struct wordlist *next;
2356 while (wp != NULL) {
2364 * auth_script_done - called when the auth-up or auth-down script
2368 auth_script_done(arg)
2371 auth_script_pid = 0;
2372 switch (auth_script_state) {
2374 if (auth_state == s_down) {
2375 auth_script_state = s_down;
2376 auth_script(_PATH_AUTHDOWN);
2380 if (auth_state == s_up) {
2381 auth_script_state = s_up;
2382 auth_script(_PATH_AUTHUP);
2389 * auth_script - execute a script with arguments
2390 * interface-name peer-name real-user tty speed
2402 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2403 user_name = pw->pw_name;
2405 slprintf(struid, sizeof(struid), "%d", getuid());
2408 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2412 argv[2] = peer_authname;
2413 argv[3] = user_name;
2418 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);