2 * auth.c - PPP authentication and phase control.
4 * Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. The name(s) of the authors of this software must not be used to
14 * endorse or promote products derived from this software without
15 * prior written permission.
17 * 3. Redistributions of any form whatsoever must retain the following
19 * "This product includes software developed by Paul Mackerras
20 * <paulus@samba.org>".
22 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
30 * Derived from main.c, which is:
32 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in
43 * the documentation and/or other materials provided with the
46 * 3. The name "Carnegie Mellon University" must not be used to
47 * endorse or promote products derived from this software without
48 * prior written permission. For permission or any legal
49 * details, please contact
50 * Office of Technology Transfer
51 * Carnegie Mellon University
53 * Pittsburgh, PA 15213-3890
54 * (412) 268-4387, fax: (412) 268-7395
55 * tech-transfer@andrew.cmu.edu
57 * 4. Redistributions of any form whatsoever must retain the following
59 * "This product includes software developed by Computing Services
60 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
62 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
63 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
64 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
65 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
67 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
68 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
71 #define RCSID "$Id: auth.c,v 1.117 2008/07/01 12:27:56 paulus Exp $"
86 #include <sys/types.h>
88 #include <sys/socket.h>
91 #if defined(_PATH_LASTLOG) && defined(__linux__)
96 #include <netinet/in.h>
97 #include <arpa/inet.h>
103 #define PW_PPP PW_LOGIN
113 #include <systemd/sd-daemon.h>
123 #include "chap-new.h"
131 #include "pathnames.h"
135 /* Bits in scan_authfile return value */
136 #define NONWILD_SERVER 1
137 #define NONWILD_CLIENT 2
139 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
141 /* The name by which the peer authenticated itself to us. */
142 char peer_authname[MAXNAMELEN];
144 /* Records which authentication operations haven't completed yet. */
145 static int auth_pending[NUM_PPP];
147 /* Records which authentication operations have been completed. */
148 int auth_done[NUM_PPP];
150 /* List of addresses which the peer may use. */
151 static struct permitted_ip *addresses[NUM_PPP];
153 /* Wordlist giving addresses which the peer may use
154 without authenticating itself. */
155 static struct wordlist *noauth_addrs;
157 /* Remote telephone number, if available */
158 char remote_number[MAXNAMELEN];
160 /* Wordlist giving remote telephone numbers which may connect. */
161 static struct wordlist *permitted_numbers;
163 /* Extra options to apply, from the secrets file entry for the peer. */
164 static struct wordlist *extra_options;
166 /* Number of network protocols which we have opened. */
167 static int num_np_open;
169 /* Number of network protocols which have come up. */
170 static int num_np_up;
172 /* Set if we got the contents of passwd[] from the pap-secrets file. */
173 static int passwd_from_file;
175 /* Set if we require authentication only because we have a default route. */
176 static bool default_auth;
178 /* Hook to enable a plugin to control the idle time limit */
179 int (*idle_time_hook)(struct ppp_idle *) = NULL;
181 /* Hook for a plugin to say whether we can possibly authenticate any peer */
182 int (*pap_check_hook)(void) = NULL;
184 /* Hook for a plugin to check the PAP user and password */
185 int (*pap_auth_hook)(char *user, char *passwd, char **msgp,
186 struct wordlist **paddrs,
187 struct wordlist **popts) = NULL;
189 /* Hook for a plugin to know about the PAP user logout */
190 void (*pap_logout_hook)(void) = NULL;
192 /* Hook for a plugin to get the PAP password for authenticating us */
193 int (*pap_passwd_hook)(char *user, char *passwd) = NULL;
195 /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */
196 int (*chap_check_hook)(void) = NULL;
198 /* Hook for a plugin to get the CHAP password for authenticating us */
199 int (*chap_passwd_hook)(char *user, char *passwd) = NULL;
202 /* Hook for a plugin to get the EAP-TLS password for authenticating us */
203 int (*eaptls_passwd_hook)(char *user, char *passwd) = NULL;
206 /* Hook for a plugin to say whether it is OK if the peer
207 refuses to authenticate. */
208 int (*null_auth_hook)(struct wordlist **paddrs,
209 struct wordlist **popts) = NULL;
211 int (*allowed_address_hook)(u_int32_t addr) = NULL;
213 #ifdef HAVE_MULTILINK
214 /* Hook for plugin to hear when an interface joins a multilink bundle */
215 void (*multilink_join_hook)(void) = NULL;
218 /* A notifier for when the peer has authenticated itself,
219 and we are proceeding to the network phase. */
220 struct notifier *auth_up_notifier = NULL;
222 /* A notifier for when the link goes down. */
223 struct notifier *link_down_notifier = NULL;
226 * This is used to ensure that we don't start an auth-up/down
227 * script while one is already running.
234 static enum script_state auth_state = s_down;
235 static enum script_state auth_script_state = s_down;
236 static pid_t auth_script_pid = 0;
241 bool uselogin = 0; /* Use /etc/passwd for checking PAP */
242 bool session_mgmt = 0; /* Do session management (login records) */
243 bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
244 bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
245 bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
246 bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */
248 bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */
249 bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */
251 bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */
252 bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */
254 bool usehostname = 0; /* Use hostname for our_name */
255 bool auth_required = 0; /* Always require authentication from peer */
256 bool allow_any_ip = 0; /* Allow peer to use any IP address */
257 bool explicit_remote = 0; /* User specified explicit remote name */
258 bool explicit_user = 0; /* Set if "user" option supplied */
259 bool explicit_passwd = 0; /* Set if "password" option supplied */
260 char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
262 char *cacert_file = NULL; /* CA certificate file (pem format) */
263 char *ca_path = NULL; /* directory with CA certificates */
264 char *cert_file = NULL; /* client certificate file (pem format) */
265 char *privkey_file = NULL; /* client private key file (pem format) */
266 char *pkcs12_file = NULL; /* client private key envelope file (pkcs12 format) */
267 char *crl_dir = NULL; /* directory containing CRL files */
268 char *crl_file = NULL; /* Certificate Revocation List (CRL) file (pem format) */
269 char *max_tls_version = NULL; /* Maximum TLS protocol version (default=1.2) */
270 char *tls_verify_method = NULL;
271 bool tls_verify_key_usage = 0;
272 bool need_peer_eap = 0; /* Require peer to authenticate us */
275 static char *uafname; /* name of most recent +ua file */
277 /* Prototypes for procedures local to this file. */
279 static void network_phase (int);
280 static void check_idle (void *);
281 static void connect_time_expired (void *);
282 static int null_login (int);
283 static int get_pap_passwd (char *);
284 static int have_pap_secret (int *);
285 static int have_chap_secret (char *, char *, int, int *);
286 static int have_srp_secret(char *client, char *server, int need_ip,
290 static int have_eaptls_secret_server
291 (char *client, char *server, int need_ip, int *lacks_ipp);
292 static int have_eaptls_secret_client (char *client, char *server);
293 static int scan_authfile_eaptls(FILE * f, char *client, char *server,
294 char *cli_cert, char *serv_cert,
295 char *ca_cert, char *pk,
296 struct wordlist ** addrs,
297 struct wordlist ** opts,
298 char *filename, int flags);
301 static int ip_addr_check (u_int32_t, struct permitted_ip *);
302 static int scan_authfile(FILE *, char *, char *, char *,
303 struct wordlist **, struct wordlist **,
305 static void free_wordlist (struct wordlist *);
306 static void auth_script (char *);
307 static void auth_script_done (void *);
308 static void set_allowed_addrs (int, struct wordlist *, struct wordlist *);
309 static int some_ip_ok (struct wordlist *);
310 static int setupapfile (char **);
311 static int privgroup (char **);
312 static int set_noauth_addr (char **);
313 static int set_permitted_number (char **);
314 static void check_access (FILE *, char *);
315 static int wordlist_count (struct wordlist *);
318 static void check_maxoctets (void *);
322 * Authentication-related options.
324 option_t auth_options[] = {
325 { "auth", o_bool, &auth_required,
326 "Require authentication from peer", OPT_PRIO | 1 },
327 { "noauth", o_bool, &auth_required,
328 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
330 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
331 "Require PAP authentication from peer",
332 OPT_PRIOSUB | 1, &auth_required },
333 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
334 "Require PAP authentication from peer",
335 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
336 { "require-chap", o_bool, &auth_required,
337 "Require CHAP authentication from peer",
338 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
339 &lcp_wantoptions[0].chap_mdtype },
340 { "+chap", o_bool, &auth_required,
341 "Require CHAP authentication from peer",
342 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
343 &lcp_wantoptions[0].chap_mdtype },
345 { "require-mschap", o_bool, &auth_required,
346 "Require MS-CHAP authentication from peer",
347 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
348 &lcp_wantoptions[0].chap_mdtype },
349 { "+mschap", o_bool, &auth_required,
350 "Require MS-CHAP authentication from peer",
351 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
352 &lcp_wantoptions[0].chap_mdtype },
353 { "require-mschap-v2", o_bool, &auth_required,
354 "Require MS-CHAPv2 authentication from peer",
355 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
356 &lcp_wantoptions[0].chap_mdtype },
357 { "+mschap-v2", o_bool, &auth_required,
358 "Require MS-CHAPv2 authentication from peer",
359 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
360 &lcp_wantoptions[0].chap_mdtype },
363 { "refuse-pap", o_bool, &refuse_pap,
364 "Don't agree to auth to peer with PAP", 1 },
365 { "-pap", o_bool, &refuse_pap,
366 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
367 { "refuse-chap", o_bool, &refuse_chap,
368 "Don't agree to auth to peer with CHAP",
369 OPT_A2CLRB | MDTYPE_MD5,
370 &lcp_allowoptions[0].chap_mdtype },
371 { "-chap", o_bool, &refuse_chap,
372 "Don't allow CHAP authentication with peer",
373 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
374 &lcp_allowoptions[0].chap_mdtype },
376 { "refuse-mschap", o_bool, &refuse_mschap,
377 "Don't agree to auth to peer with MS-CHAP",
378 OPT_A2CLRB | MDTYPE_MICROSOFT,
379 &lcp_allowoptions[0].chap_mdtype },
380 { "-mschap", o_bool, &refuse_mschap,
381 "Don't allow MS-CHAP authentication with peer",
382 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
383 &lcp_allowoptions[0].chap_mdtype },
384 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
385 "Don't agree to auth to peer with MS-CHAPv2",
386 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
387 &lcp_allowoptions[0].chap_mdtype },
388 { "-mschap-v2", o_bool, &refuse_mschap_v2,
389 "Don't allow MS-CHAPv2 authentication with peer",
390 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
391 &lcp_allowoptions[0].chap_mdtype },
394 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
395 "Require EAP authentication from peer", OPT_PRIOSUB | 1,
397 { "refuse-eap", o_bool, &refuse_eap,
398 "Don't agree to authenticate to peer with EAP", 1 },
400 { "name", o_string, our_name,
401 "Set local name for authentication",
402 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
404 { "+ua", o_special, (void *)setupapfile,
405 "Get PAP user and password from file",
406 OPT_PRIO | OPT_A2STRVAL, &uafname },
408 { "user", o_string, user,
409 "Set name for auth with peer", OPT_PRIO | OPT_STATIC,
410 &explicit_user, MAXNAMELEN },
412 { "password", o_string, passwd,
413 "Password for authenticating us to the peer",
414 OPT_PRIO | OPT_STATIC | OPT_HIDE,
415 &explicit_passwd, MAXSECRETLEN },
417 { "usehostname", o_bool, &usehostname,
418 "Must use hostname for authentication", 1 },
420 { "remotename", o_string, remote_name,
421 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
422 &explicit_remote, MAXNAMELEN },
424 { "login", o_bool, &uselogin,
425 "Use system password database for PAP", OPT_A2COPY | 1 ,
427 { "enable-session", o_bool, &session_mgmt,
428 "Enable session accounting for remote peers", OPT_PRIV | 1 },
430 { "papcrypt", o_bool, &cryptpap,
431 "PAP passwords are encrypted", 1 },
433 { "privgroup", o_special, (void *)privgroup,
434 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
436 { "allow-ip", o_special, (void *)set_noauth_addr,
437 "Set IP address(es) which can be used without authentication",
438 OPT_PRIV | OPT_A2LIST },
440 { "remotenumber", o_string, remote_number,
441 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
444 { "allow-number", o_special, (void *)set_permitted_number,
445 "Set telephone number(s) which are allowed to connect",
446 OPT_PRIV | OPT_A2LIST },
449 { "ca", o_string, &cacert_file, "EAP-TLS CA certificate in PEM format" },
450 { "capath", o_string, &ca_path, "EAP-TLS CA certificate directory" },
451 { "cert", o_string, &cert_file, "EAP-TLS client certificate in PEM format" },
452 { "key", o_string, &privkey_file, "EAP-TLS client private key in PEM format" },
453 { "crl-dir", o_string, &crl_dir, "Use CRLs in directory" },
454 { "crl", o_string, &crl_file, "Use specific CRL file" },
455 { "pkcs12", o_string, &pkcs12_file, "EAP-TLS client credentials in PKCS12 format" },
456 { "max-tls-version", o_string, &max_tls_version,
457 "Maximum TLS version (1.0/1.1/1.2 (default)/1.3)" },
458 { "tls-verify-key-usage", o_bool, &tls_verify_key_usage,
459 "Verify certificate type and extended key usage" },
460 { "tls-verify-method", o_string, &tls_verify_method,
461 "Verify peer by method (none|subject|name|suffix)" },
462 { "need-peer-eap", o_bool, &need_peer_eap,
463 "Require the peer to authenticate us", 1 },
464 #endif /* USE_EAPTLS */
469 * setupapfile - specifies UPAP info for authenticating with peer.
472 setupapfile(char **argv)
477 char u[MAXNAMELEN], p[MAXSECRETLEN];
480 lcp_allowoptions[0].neg_upap = 1;
482 /* open user info file */
483 fname = strdup(*argv);
485 novm("+ua file name");
487 if (seteuid(getuid()) == -1) {
488 option_error("unable to reset uid before opening %s: %m", fname);
492 ufile = fopen(fname, "r");
493 if (seteuid(euid) == -1)
494 fatal("unable to regain privileges: %m");
496 option_error("unable to open user login data file %s", fname);
500 check_access(ufile, fname);
504 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
505 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
507 option_error("unable to read user login data file %s", fname);
513 /* get rid of newlines */
515 if (l > 0 && u[l-1] == '\n')
518 if (l > 0 && p[l-1] == '\n')
521 if (override_value("user", option_priority, fname)) {
522 strlcpy(user, u, sizeof(user));
525 if (override_value("passwd", option_priority, fname)) {
526 strlcpy(passwd, p, sizeof(passwd));
536 * privgroup - allow members of the group to have privileged access.
539 privgroup(char **argv)
546 option_error("group %s is unknown", *argv);
549 for (i = 0; i < ngroups; ++i) {
550 if (groups[i] == g->gr_gid) {
560 * set_noauth_addr - set address(es) that can be used without authentication.
561 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
564 set_noauth_addr(char **argv)
567 int l = strlen(addr) + 1;
570 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
572 novm("allow-ip argument");
573 wp->word = (char *) (wp + 1);
574 wp->next = noauth_addrs;
575 BCOPY(addr, wp->word, l);
582 * set_permitted_number - set remote telephone number(s) that may connect.
585 set_permitted_number(char **argv)
587 char *number = *argv;
588 int l = strlen(number) + 1;
591 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
593 novm("allow-number argument");
594 wp->word = (char *) (wp + 1);
595 wp->next = permitted_numbers;
596 BCOPY(number, wp->word, l);
597 permitted_numbers = wp;
603 * An Open on LCP has requested a change from Dead to Establish phase.
606 link_required(int unit)
611 * Bring the link up to the point of being able to do ppp.
613 void start_link(int unit)
615 status = EXIT_CONNECT_FAILED;
616 new_phase(PHASE_SERIALCONN);
619 devfd = the_channel->connect();
623 /* set up the serial device as a ppp interface */
625 * N.B. we used to do tdb_writelock/tdb_writeunlock around this
626 * (from establish_ppp to set_ifunit). However, we won't be
627 * doing the set_ifunit in multilink mode, which is the only time
628 * we need the atomicity that the tdb_writelock/tdb_writeunlock
629 * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock.
631 fd_ppp = the_channel->establish_ppp(devfd);
633 status = EXIT_FATAL_ERROR;
637 if (!demand && ifunit >= 0)
641 * Start opening the connection and wait for
642 * incoming events (reply, timeout, etc.).
645 notice("Connect: %s <--> %s", ifname, ppp_devnam);
647 notice("Starting negotiation on %s", ppp_devnam);
650 status = EXIT_NEGOTIATION_FAILED;
651 new_phase(PHASE_ESTABLISH);
657 new_phase(PHASE_DISCONNECT);
658 if (the_channel->disconnect)
659 the_channel->disconnect();
662 new_phase(PHASE_DEAD);
663 if (the_channel->cleanup)
664 (*the_channel->cleanup)();
668 * LCP has terminated the link; go to the Dead phase and take the
669 * physical layer down.
672 link_terminated(int unit)
674 if (phase == PHASE_DEAD || phase == PHASE_MASTER)
676 new_phase(PHASE_DISCONNECT);
678 if (pap_logout_hook) {
683 if (!doing_multilink) {
684 notice("Connection terminated.");
687 notice("Link terminated.");
690 * Delete pid files before disestablishing ppp. Otherwise it
691 * can happen that another pppd gets the same unit and then
692 * we delete its pid file.
694 if (!doing_multilink && !demand)
698 * If we may want to bring the link up again, transfer
699 * the ppp unit back to the loopback. Set the
700 * real serial device back to its normal mode of operation.
705 the_channel->disestablish_ppp(devfd);
712 if (!doing_multilink && !demand)
713 script_unsetenv("IFNAME");
716 * Run disconnector script, if requested.
717 * XXX we may not be able to do this if the line has hung up!
719 if (devfd >= 0 && the_channel->disconnect) {
720 the_channel->disconnect();
723 if (the_channel->cleanup)
724 (*the_channel->cleanup)();
726 if (doing_multilink && multilink_master) {
727 if (!bundle_terminating) {
728 new_phase(PHASE_MASTER);
729 if (master_detach && !detached)
732 mp_bundle_terminated();
734 new_phase(PHASE_DEAD);
738 * LCP has gone down; it will either die or try to re-establish.
743 if (auth_state != s_down) {
744 notify(link_down_notifier, 0);
746 if (auth_script_state == s_up && auth_script_pid == 0) {
747 update_link_stats(unit);
748 auth_script_state = s_down;
749 auth_script(_PATH_AUTHDOWN);
752 if (!doing_multilink) {
753 upper_layers_down(unit);
754 if (phase != PHASE_DEAD && phase != PHASE_MASTER)
755 new_phase(PHASE_ESTABLISH);
757 /* XXX if doing_multilink, should do something to stop
758 network-layer traffic on the link */
761 void upper_layers_down(int unit)
764 struct protent *protp;
766 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
767 if (!protp->enabled_flag)
769 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
770 (*protp->lowerdown)(unit);
771 if (protp->protocol < 0xC000 && protp->close != NULL)
772 (*protp->close)(unit, "LCP down");
779 * The link is established.
780 * Proceed to the Dead, Authenticate or Network phase as appropriate.
783 link_established(int unit)
786 lcp_options *wo = &lcp_wantoptions[unit];
787 lcp_options *go = &lcp_gotoptions[unit];
788 lcp_options *ho = &lcp_hisoptions[unit];
790 lcp_options *ao = &lcp_allowoptions[unit];
793 struct protent *protp;
796 * Tell higher-level protocols that LCP is up.
798 if (!doing_multilink) {
799 for (i = 0; (protp = protocols[i]) != NULL; ++i)
800 if (protp->protocol != PPP_LCP && protp->enabled_flag
801 && protp->lowerup != NULL)
802 (*protp->lowerup)(unit);
805 if (!auth_required && noauth_addrs != NULL)
806 set_allowed_addrs(unit, NULL, NULL);
808 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) {
810 * We wanted the peer to authenticate itself, and it refused:
811 * if we have some address(es) it can use without auth, fine,
812 * otherwise treat it as though it authenticated with PAP using
813 * a username of "" and a password of "". If that's not OK,
816 if (noauth_addrs != NULL) {
817 set_allowed_addrs(unit, NULL, NULL);
818 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
819 warn("peer refused to authenticate: terminating link");
820 status = EXIT_PEER_AUTH_FAILED;
821 lcp_close(unit, "peer refused to authenticate");
827 if (need_peer_eap && !ao->neg_eap) {
828 warn("eap required to authenticate us but no suitable secrets");
829 lcp_close(unit, "couldn't negotiate eap");
830 status = EXIT_AUTH_TOPEER_FAILED;
834 if (need_peer_eap && !ho->neg_eap) {
835 warn("peer doesn't want to authenticate us with eap");
836 lcp_close(unit, "couldn't negotiate eap");
837 status = EXIT_PEER_AUTH_FAILED;
842 new_phase(PHASE_AUTHENTICATE);
845 eap_authpeer(unit, our_name);
847 } else if (go->neg_chap) {
848 chap_auth_peer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
850 } else if (go->neg_upap) {
855 eap_authwithpeer(unit, user);
856 auth |= EAP_WITHPEER;
857 } else if (ho->neg_chap) {
858 chap_auth_with_peer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
859 auth |= CHAP_WITHPEER;
860 } else if (ho->neg_upap) {
861 /* If a blank password was explicitly given as an option, trust
862 the user and don't try to look up one. */
863 if (passwd[0] == 0 && !explicit_passwd) {
864 passwd_from_file = 1;
865 if (!get_pap_passwd(passwd))
866 error("No secret found for PAP login");
868 upap_authwithpeer(unit, user, passwd);
869 auth |= PAP_WITHPEER;
871 auth_pending[unit] = auth;
879 * Proceed to the network phase.
882 network_phase(int unit)
884 lcp_options *go = &lcp_gotoptions[unit];
886 /* Log calling number. */
888 notice("peer from calling number %q authorized", remote_number);
891 * If the peer had to authenticate, run the auth-up script now.
893 notify(auth_up_notifier, 0);
894 if (go->neg_chap || go->neg_upap || go->neg_eap) {
896 if (auth_script_state == s_down && auth_script_pid == 0) {
897 auth_script_state = s_up;
898 auth_script(_PATH_AUTHUP);
904 * If we negotiated callback, do it now.
907 new_phase(PHASE_CALLBACK);
908 (*cbcp_protent.open)(unit);
914 * Process extra options from the secrets file
917 options_from_list(extra_options, 1);
918 free_wordlist(extra_options);
921 start_networks(unit);
925 start_networks(int unit)
928 struct protent *protp;
929 int ecp_required, mppe_required;
931 new_phase(PHASE_NETWORK);
933 #ifdef HAVE_MULTILINK
935 if (mp_join_bundle()) {
936 if (multilink_join_hook)
937 (*multilink_join_hook)();
938 if (updetach && !nodetach)
943 #endif /* HAVE_MULTILINK */
947 set_filters(&pass_filter, &active_filter);
949 /* Start CCP and ECP */
950 for (i = 0; (protp = protocols[i]) != NULL; ++i)
951 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
952 && protp->enabled_flag && protp->open != NULL)
956 * Bring up other network protocols iff encryption is not required.
958 ecp_required = ecp_gotoptions[unit].required;
959 mppe_required = ccp_gotoptions[unit].mppe;
960 if (!ecp_required && !mppe_required)
961 continue_networks(unit);
965 continue_networks(int unit)
968 struct protent *protp;
971 * Start the "real" network protocols.
973 for (i = 0; (protp = protocols[i]) != NULL; ++i)
974 if (protp->protocol < 0xC000
975 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
976 && protp->enabled_flag && protp->open != NULL) {
981 if (num_np_open == 0)
983 lcp_close(0, "No network protocols running");
987 * The peer has failed to authenticate himself using `protocol'.
990 auth_peer_fail(int unit, int protocol)
993 * Authentication failure: take the link down
995 status = EXIT_PEER_AUTH_FAILED;
996 lcp_close(unit, "Authentication failed");
1000 * The peer has been successfully authenticated using `protocol'.
1003 auth_peer_success(int unit, int protocol, int prot_flavor,
1004 char *name, int namelen)
1011 switch (prot_flavor) {
1013 bit |= CHAP_MD5_PEER;
1016 case CHAP_MICROSOFT:
1017 bit |= CHAP_MS_PEER;
1019 case CHAP_MICROSOFT_V2:
1020 bit |= CHAP_MS2_PEER;
1032 warn("auth_peer_success: unknown protocol %x", protocol);
1037 * Save the authenticated name of the peer for later.
1039 if (namelen > sizeof(peer_authname) - 1)
1040 namelen = sizeof(peer_authname) - 1;
1041 BCOPY(name, peer_authname, namelen);
1042 peer_authname[namelen] = 0;
1043 script_setenv("PEERNAME", peer_authname, 0);
1045 /* Save the authentication method for later. */
1046 auth_done[unit] |= bit;
1049 * If there is no more authentication still to be done,
1050 * proceed to the network (or callback) phase.
1052 if ((auth_pending[unit] &= ~bit) == 0)
1053 network_phase(unit);
1057 * We have failed to authenticate ourselves to the peer using `protocol'.
1060 auth_withpeer_fail(int unit, int protocol)
1062 if (passwd_from_file)
1063 BZERO(passwd, MAXSECRETLEN);
1065 * We've failed to authenticate ourselves to our peer.
1066 * Some servers keep sending CHAP challenges, but there
1067 * is no point in persisting without any way to get updated
1068 * authentication secrets.
1070 status = EXIT_AUTH_TOPEER_FAILED;
1071 lcp_close(unit, "Failed to authenticate ourselves to peer");
1075 * We have successfully authenticated ourselves with the peer using `protocol'.
1078 auth_withpeer_success(int unit, int protocol, int prot_flavor)
1081 const char *prot = "";
1085 bit = CHAP_WITHPEER;
1087 switch (prot_flavor) {
1089 bit |= CHAP_MD5_WITHPEER;
1092 case CHAP_MICROSOFT:
1093 bit |= CHAP_MS_WITHPEER;
1095 case CHAP_MICROSOFT_V2:
1096 bit |= CHAP_MS2_WITHPEER;
1102 if (passwd_from_file)
1103 BZERO(passwd, MAXSECRETLEN);
1112 warn("auth_withpeer_success: unknown protocol %x", protocol);
1116 notice("%s authentication succeeded", prot);
1118 /* Save the authentication method for later. */
1119 auth_done[unit] |= bit;
1122 * If there is no more authentication still being done,
1123 * proceed to the network (or callback) phase.
1125 if ((auth_pending[unit] &= ~bit) == 0)
1126 network_phase(unit);
1131 * np_up - a network protocol has come up.
1134 np_up(int unit, int proto)
1138 if (num_np_up == 0) {
1140 * At this point we consider that the link has come up successfully.
1144 new_phase(PHASE_RUNNING);
1146 if (idle_time_hook != 0)
1147 tlim = (*idle_time_hook)(NULL);
1149 tlim = idle_time_limit;
1151 TIMEOUT(check_idle, NULL, tlim);
1154 * Set a timeout to close the connection once the maximum
1155 * connect time has expired.
1158 TIMEOUT(connect_time_expired, 0, maxconnect);
1162 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1166 * Detach now, if the updetach option was given.
1168 if (updetach && !nodetach) {
1169 dbglog("updetach is set. Now detaching.");
1172 } else if (nodetach && up_sdnotify) {
1173 dbglog("up_sdnotify is set. Now notifying systemd: READY=1");
1174 sd_notify(0, "READY=1");
1182 * np_down - a network protocol has gone down.
1185 np_down(int unit, int proto)
1187 if (--num_np_up == 0) {
1188 UNTIMEOUT(check_idle, NULL);
1189 UNTIMEOUT(connect_time_expired, NULL);
1191 UNTIMEOUT(check_maxoctets, NULL);
1193 new_phase(PHASE_NETWORK);
1198 * np_finished - a network protocol has finished using the link.
1201 np_finished(int unit, int proto)
1203 if (--num_np_open <= 0) {
1204 /* no further use for the link: shut up shop. */
1205 lcp_close(0, "No network protocols running");
1211 check_maxoctets(void *arg)
1215 update_link_stats(ifunit);
1218 switch(maxoctets_dir) {
1219 case PPP_OCTETS_DIRECTION_IN:
1220 used = link_stats.bytes_in;
1222 case PPP_OCTETS_DIRECTION_OUT:
1223 used = link_stats.bytes_out;
1225 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1226 case PPP_OCTETS_DIRECTION_MAXSESSION:
1227 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1230 used = link_stats.bytes_in+link_stats.bytes_out;
1233 if (used > maxoctets) {
1234 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1235 status = EXIT_TRAFFIC_LIMIT;
1236 lcp_close(0, "Traffic limit");
1239 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1245 * check_idle - check whether the link has been idle for long
1246 * enough that we can shut it down.
1249 check_idle(void *arg)
1251 struct ppp_idle idle;
1255 if (!get_idle_time(0, &idle))
1257 if (idle_time_hook != 0) {
1258 tlim = idle_time_hook(&idle);
1260 itime = MIN(idle.xmit_idle, idle.recv_idle);
1261 tlim = idle_time_limit - itime;
1264 /* link is idle: shut it down. */
1265 notice("Terminating connection due to lack of activity.");
1266 status = EXIT_IDLE_TIMEOUT;
1267 lcp_close(0, "Link inactive");
1270 TIMEOUT(check_idle, NULL, tlim);
1275 * connect_time_expired - log a message and close the connection.
1278 connect_time_expired(void *arg)
1280 info("Connect time expired");
1281 status = EXIT_CONNECT_TIME;
1282 lcp_close(0, "Connect time expired"); /* Close connection */
1286 * auth_check_options - called to check authentication options.
1289 auth_check_options(void)
1291 lcp_options *wo = &lcp_wantoptions[0];
1295 /* Default our_name to hostname, and user to our_name */
1296 if (our_name[0] == 0 || usehostname)
1297 strlcpy(our_name, hostname, sizeof(our_name));
1298 /* If a blank username was explicitly given as an option, trust
1299 the user and don't use our_name */
1300 if (user[0] == 0 && !explicit_user)
1301 strlcpy(user, our_name, sizeof(user));
1304 * If we have a default route, require the peer to authenticate
1305 * unless the noauth option was given or the real user is root.
1307 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1312 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1313 if (wo->chap_mdtype)
1316 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1317 if (auth_required) {
1319 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) {
1320 wo->neg_chap = chap_mdtype_all != MDTYPE_NONE;
1321 wo->chap_mdtype = chap_mdtype_all;
1327 wo->chap_mdtype = MDTYPE_NONE;
1333 * Check whether we have appropriate secrets to use
1334 * to authenticate the peer. Note that EAP can authenticate by way
1335 * of a CHAP-like exchanges as well as SRP.
1338 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1339 if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
1340 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1341 our_name, 1, &lacks_ip);
1343 if (!can_auth && wo->neg_eap) {
1344 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1345 our_name, 1, &lacks_ip);
1349 if (!can_auth && wo->neg_eap) {
1351 have_eaptls_secret_server((explicit_remote ? remote_name :
1352 NULL), our_name, 1, &lacks_ip);
1357 if (auth_required && !can_auth && noauth_addrs == NULL) {
1360 "By default the remote system is required to authenticate itself");
1362 "(because this system has a default route to the internet)");
1363 } else if (explicit_remote)
1365 "The remote system (%s) is required to authenticate itself",
1369 "The remote system is required to authenticate itself");
1371 "but I couldn't find any suitable secret (password) for it to use to do so.");
1374 "(None of the available passwords would let it use an IP address.)");
1380 * Early check for remote number authorization.
1382 if (!auth_number()) {
1383 warn("calling number %q is not authorized", remote_number);
1384 exit(EXIT_CNID_AUTH_FAILED);
1389 * auth_reset - called when LCP is starting negotiations to recheck
1390 * authentication options, i.e. whether we have appropriate secrets
1391 * to use for authenticating ourselves and/or the peer.
1394 auth_reset(int unit)
1396 lcp_options *go = &lcp_gotoptions[unit];
1397 lcp_options *ao = &lcp_allowoptions[unit];
1401 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1402 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1403 && ((passwd[0] != 0 || explicit_passwd) ||
1404 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1406 ao->neg_eap = !refuse_eap && (
1408 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1409 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1410 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL)
1412 || have_eaptls_secret_client(user, (explicit_remote? remote_name: NULL))
1417 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1420 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1421 our_name, 1, NULL)))
1425 (hadchap == 0 || (hadchap == -1 &&
1426 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1428 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1431 && !have_eaptls_secret_server((explicit_remote? remote_name: NULL),
1440 * check_passwd - Check the user name and passwd against the PAP secrets
1441 * file. If requested, also check against the system password database,
1442 * and login the user if OK.
1445 * UPAP_AUTHNAK: Authentication failed.
1446 * UPAP_AUTHACK: Authentication succeeded.
1447 * In either case, msg points to an appropriate message.
1450 check_passwd(int unit,
1451 char *auser, int userlen,
1452 char *apasswd, int passwdlen, char **msg)
1457 struct wordlist *addrs = NULL, *opts = NULL;
1458 char passwd[256], user[256];
1459 char secret[MAXWORDLEN];
1460 static int attempts = 0;
1463 * Make copies of apasswd and auser, then null-terminate them.
1464 * If there are unprintable characters in the password, make
1467 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1468 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1472 * Check if a plugin wants to handle this.
1474 if (pap_auth_hook) {
1475 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1477 /* note: set_allowed_addrs() saves opts (but not addrs):
1480 set_allowed_addrs(unit, addrs, opts);
1482 free_wordlist(opts);
1484 free_wordlist(addrs);
1485 BZERO(passwd, sizeof(passwd));
1486 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1491 * Open the file of pap secrets and scan for a suitable secret
1492 * for authenticating this user.
1494 filename = _PATH_UPAPFILE;
1495 addrs = opts = NULL;
1497 f = fopen(filename, "r");
1499 error("Can't open PAP password file %s: %m", filename);
1502 check_access(f, filename);
1503 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1504 warn("no PAP secret found for %s", user);
1507 * If the secret is "@login", it means to check
1508 * the password against the login database.
1510 int login_secret = strcmp(secret, "@login") == 0;
1512 if (uselogin || login_secret) {
1513 /* login option or secret is @login */
1514 if (session_full(user, passwd, devnam, msg) == 0) {
1517 } else if (session_mgmt) {
1518 if (session_check(user, NULL, devnam, NULL) == 0) {
1519 warn("Peer %q failed PAP Session verification", user);
1523 if (secret[0] != 0 && !login_secret) {
1524 /* password given in pap-secrets - must match */
1525 if (cryptpap || strcmp(passwd, secret) != 0) {
1527 char *cbuf = crypt(passwd, secret);
1528 if (!cbuf || strcmp(cbuf, secret) != 0)
1537 if (ret == UPAP_AUTHNAK) {
1539 *msg = "Login incorrect";
1541 * XXX can we ever get here more than once??
1542 * Frustrate passwd stealer programs.
1543 * Allow 10 tries, but start backing off after 3 (stolen from login).
1544 * On 10'th, drop the connection.
1546 if (attempts++ >= 10) {
1547 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1548 lcp_close(unit, "login failed");
1551 sleep((u_int) (attempts - 3) * 5);
1553 free_wordlist(opts);
1556 attempts = 0; /* Reset count */
1559 set_allowed_addrs(unit, addrs, opts);
1563 free_wordlist(addrs);
1564 BZERO(passwd, sizeof(passwd));
1565 BZERO(secret, sizeof(secret));
1571 * null_login - Check if a username of "" and a password of "" are
1572 * acceptable, and iff so, set the list of acceptable IP addresses
1576 null_login(int unit)
1581 struct wordlist *addrs, *opts;
1582 char secret[MAXWORDLEN];
1585 * Check if a plugin wants to handle this.
1589 ret = (*null_auth_hook)(&addrs, &opts);
1592 * Open the file of pap secrets and scan for a suitable secret.
1595 filename = _PATH_UPAPFILE;
1597 f = fopen(filename, "r");
1600 check_access(f, filename);
1602 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1603 ret = i >= 0 && secret[0] == 0;
1604 BZERO(secret, sizeof(secret));
1609 set_allowed_addrs(unit, addrs, opts);
1611 free_wordlist(opts);
1613 free_wordlist(addrs);
1620 * get_pap_passwd - get a password for authenticating ourselves with
1621 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1623 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1626 get_pap_passwd(char *passwd)
1631 char secret[MAXWORDLEN];
1634 * Check whether a plugin wants to supply this.
1636 if (pap_passwd_hook) {
1637 ret = (*pap_passwd_hook)(user, passwd);
1642 filename = _PATH_UPAPFILE;
1643 f = fopen(filename, "r");
1646 check_access(f, filename);
1647 ret = scan_authfile(f, user,
1648 (remote_name[0]? remote_name: NULL),
1649 secret, NULL, NULL, filename, 0);
1654 strlcpy(passwd, secret, MAXSECRETLEN);
1655 BZERO(secret, sizeof(secret));
1661 * have_pap_secret - check whether we have a PAP file with any
1662 * secrets that we could possibly use for authenticating the peer.
1665 have_pap_secret(int *lacks_ipp)
1670 struct wordlist *addrs;
1672 /* let the plugin decide, if there is one */
1673 if (pap_check_hook) {
1674 ret = (*pap_check_hook)();
1679 filename = _PATH_UPAPFILE;
1680 f = fopen(filename, "r");
1684 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1685 NULL, &addrs, NULL, filename, 0);
1687 if (ret >= 0 && !some_ip_ok(addrs)) {
1693 free_wordlist(addrs);
1700 * have_chap_secret - check whether we have a CHAP file with a
1701 * secret that we could possibly use for authenticating `client'
1702 * on `server'. Either can be the null string, meaning we don't
1703 * know the identity yet.
1706 have_chap_secret(char *client, char *server,
1707 int need_ip, int *lacks_ipp)
1712 struct wordlist *addrs;
1714 if (chap_check_hook) {
1715 ret = (*chap_check_hook)();
1721 filename = _PATH_CHAPFILE;
1722 f = fopen(filename, "r");
1726 if (client != NULL && client[0] == 0)
1728 else if (server != NULL && server[0] == 0)
1731 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1733 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1739 free_wordlist(addrs);
1746 * have_srp_secret - check whether we have a SRP file with a
1747 * secret that we could possibly use for authenticating `client'
1748 * on `server'. Either can be the null string, meaning we don't
1749 * know the identity yet.
1752 have_srp_secret(char *client, char *server, int need_ip, int *lacks_ipp)
1757 struct wordlist *addrs;
1759 filename = _PATH_SRPFILE;
1760 f = fopen(filename, "r");
1764 if (client != NULL && client[0] == 0)
1766 else if (server != NULL && server[0] == 0)
1769 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1771 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1777 free_wordlist(addrs);
1784 * get_secret - open the CHAP secret file and return the secret
1785 * for authenticating the given client on the given server.
1786 * (We could be either client or server).
1789 get_secret(int unit, char *client, char *server,
1790 char *secret, int *secret_len, int am_server)
1795 struct wordlist *addrs, *opts;
1796 char secbuf[MAXWORDLEN];
1798 if (!am_server && passwd[0] != 0) {
1799 strlcpy(secbuf, passwd, sizeof(secbuf));
1800 } else if (!am_server && chap_passwd_hook) {
1801 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1802 error("Unable to obtain CHAP password for %s on %s from plugin",
1807 filename = _PATH_CHAPFILE;
1811 f = fopen(filename, "r");
1813 error("Can't open chap secret file %s: %m", filename);
1816 check_access(f, filename);
1818 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1824 set_allowed_addrs(unit, addrs, opts);
1826 free_wordlist(opts);
1828 free_wordlist(addrs);
1831 len = strlen(secbuf);
1832 if (len > MAXSECRETLEN) {
1833 error("Secret for %s on %s is too long", client, server);
1836 BCOPY(secbuf, secret, len);
1837 BZERO(secbuf, sizeof(secbuf));
1845 * get_srp_secret - open the SRP secret file and return the secret
1846 * for authenticating the given client on the given server.
1847 * (We could be either client or server).
1850 get_srp_secret(int unit, char *client, char *server,
1851 char *secret, int am_server)
1856 struct wordlist *addrs, *opts;
1858 if (!am_server && passwd[0] != '\0') {
1859 strlcpy(secret, passwd, MAXWORDLEN);
1861 filename = _PATH_SRPFILE;
1864 fp = fopen(filename, "r");
1866 error("Can't open srp secret file %s: %m", filename);
1869 check_access(fp, filename);
1872 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
1873 filename, am_server);
1879 set_allowed_addrs(unit, addrs, opts);
1880 else if (opts != NULL)
1881 free_wordlist(opts);
1883 free_wordlist(addrs);
1890 * set_allowed_addrs() - set the list of allowed addresses.
1891 * Also looks for `--' indicating options to apply for this peer
1892 * and leaves the following words in extra_options.
1895 set_allowed_addrs(int unit, struct wordlist *addrs,
1896 struct wordlist *opts)
1899 struct wordlist *ap, **plink;
1900 struct permitted_ip *ip;
1901 char *ptr_word, *ptr_mask;
1904 u_int32_t a, mask, ah, offset;
1905 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1906 u_int32_t suggested_ip = 0;
1908 if (addresses[unit] != NULL)
1909 free(addresses[unit]);
1910 addresses[unit] = NULL;
1911 if (extra_options != NULL)
1912 free_wordlist(extra_options);
1913 extra_options = opts;
1916 * Count the number of IP addresses given.
1918 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
1921 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
1925 /* temporarily append the noauth_addrs list to addrs */
1926 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
1928 *plink = noauth_addrs;
1931 for (ap = addrs; ap != NULL; ap = ap->next) {
1932 /* "-" means no addresses authorized, "*" means any address allowed */
1933 ptr_word = ap->word;
1934 if (strcmp(ptr_word, "-") == 0)
1936 if (strcmp(ptr_word, "*") == 0) {
1938 ip[n].base = ip[n].mask = 0;
1944 if (*ptr_word == '!') {
1949 mask = ~ (u_int32_t) 0;
1951 ptr_mask = strchr (ptr_word, '/');
1952 if (ptr_mask != NULL) {
1956 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
1957 if (bit_count <= 0 || bit_count > 32) {
1958 warn("invalid address length %v in auth. address list",
1962 bit_count = 32 - bit_count; /* # bits in host part */
1964 offset = ifunit + 1;
1968 warn("invalid address length syntax: %v", ptr_mask+1);
1975 hp = gethostbyname(ptr_word);
1976 if (hp != NULL && hp->h_addrtype == AF_INET) {
1977 a = *(u_int32_t *)hp->h_addr;
1979 np = getnetbyname (ptr_word);
1980 if (np != NULL && np->n_addrtype == AF_INET) {
1981 a = htonl ((u_int32_t)np->n_net);
1982 if (ptr_mask == NULL) {
1983 /* calculate appropriate mask for net */
1986 mask = IN_CLASSA_NET;
1987 else if (IN_CLASSB(ah))
1988 mask = IN_CLASSB_NET;
1989 else if (IN_CLASSC(ah))
1990 mask = IN_CLASSC_NET;
1993 a = inet_addr (ptr_word);
1997 if (ptr_mask != NULL)
2000 if (a == (u_int32_t)-1L) {
2001 warn("unknown host %s in auth. address list", ap->word);
2005 if (offset >= ~mask) {
2006 warn("interface unit %d too large for subnet %v",
2010 a = htonl((ntohl(a) & mask) + offset);
2011 mask = ~(u_int32_t)0;
2013 ip[n].mask = htonl(mask);
2014 ip[n].base = a & ip[n].mask;
2016 if (~mask == 0 && suggested_ip == 0)
2021 ip[n].permit = 0; /* make the last entry forbid all addresses */
2022 ip[n].base = 0; /* to terminate the list */
2025 addresses[unit] = ip;
2028 * If the address given for the peer isn't authorized, or if
2029 * the user hasn't given one, AND there is an authorized address
2030 * which is a single host, then use that if we find one.
2032 if (suggested_ip != 0
2033 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2034 wo->hisaddr = suggested_ip;
2036 * Do we insist on this address? No, if there are other
2037 * addresses authorized than the suggested one.
2040 wo->accept_remote = 1;
2045 * auth_ip_addr - check whether the peer is authorized to use
2046 * a given IP address. Returns 1 if authorized, 0 otherwise.
2049 auth_ip_addr(int unit, u_int32_t addr)
2053 /* don't allow loopback or multicast address */
2054 if (bad_ip_adrs(addr))
2057 if (allowed_address_hook) {
2058 ok = allowed_address_hook(addr);
2059 if (ok >= 0) return ok;
2062 if (addresses[unit] != NULL) {
2063 ok = ip_addr_check(addr, addresses[unit]);
2069 return 0; /* no addresses authorized */
2070 return allow_any_ip || privileged || !have_route_to(addr);
2074 ip_addr_check(u_int32_t addr, 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.
2087 bad_ip_adrs(u_int32_t addr)
2090 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2091 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2095 * some_ip_ok - check a wordlist to see if it authorizes any
2099 some_ip_ok(struct wordlist *addrs)
2101 for (; addrs != 0; addrs = addrs->next) {
2102 if (addrs->word[0] == '-')
2104 if (addrs->word[0] != '!')
2105 return 1; /* some IP address is allowed */
2111 * auth_number - check whether the remote number is allowed to connect.
2112 * Returns 1 if authorized, 0 otherwise.
2117 struct wordlist *wp = permitted_numbers;
2120 /* Allow all if no authorization list. */
2124 /* Allow if we have a match in the authorization list. */
2126 /* trailing '*' wildcard */
2127 l = strlen(wp->word);
2128 if ((wp->word)[l - 1] == '*')
2130 if (!strncasecmp(wp->word, remote_number, l))
2139 * check_access - complain if a secret file has too-liberal permissions.
2142 check_access(FILE *f, char *filename)
2146 if (fstat(fileno(f), &sbuf) < 0) {
2147 warn("cannot stat secret file %s: %m", filename);
2148 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2149 warn("Warning - secret file %s has world and/or group access",
2156 * scan_authfile - Scan an authorization file for a secret suitable
2157 * for authenticating `client' on `server'. The return value is -1
2158 * if no secret is found, otherwise >= 0. The return value has
2159 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2160 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2161 * Any following words on the line up to a "--" (i.e. address authorization
2162 * info) are placed in a wordlist and returned in *addrs. Any
2163 * following words (extra options) are placed in a wordlist and
2164 * returned in *opts.
2165 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2166 * Flags are non-zero if we need two colons in the secret in order to
2170 scan_authfile(FILE *f, char *client, char *server,
2171 char *secret, struct wordlist **addrs,
2172 struct wordlist **opts, char *filename,
2176 int got_flag, best_flag;
2178 struct wordlist *ap, *addr_list, *alist, **app;
2179 char word[MAXWORDLEN];
2180 char atfile[MAXWORDLEN];
2181 char lsecret[MAXWORDLEN];
2189 if (!getword(f, word, &newline, filename))
2190 return -1; /* file is empty??? */
2195 * Skip until we find a word at the start of a line.
2197 while (!newline && getword(f, word, &newline, filename))
2200 break; /* got to end of file */
2203 * Got a client - check if it's a match or a wildcard.
2206 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2211 got_flag = NONWILD_CLIENT;
2214 * Now get a server and check if it matches.
2216 if (!getword(f, word, &newline, filename))
2220 if (!ISWILD(word)) {
2221 if (server != NULL && strcmp(word, server) != 0)
2223 got_flag |= NONWILD_SERVER;
2227 * Got some sort of a match - see if it's better than what
2230 if (got_flag <= best_flag)
2236 if (!getword(f, word, &newline, filename))
2242 * SRP-SHA1 authenticator should never be reading secrets from
2243 * a file. (Authenticatee may, though.)
2245 if (flags && ((cp = strchr(word, ':')) == NULL ||
2246 strchr(cp + 1, ':') == NULL))
2249 if (secret != NULL) {
2251 * Special syntax: @/pathname means read secret from file.
2253 if (word[0] == '@' && word[1] == '/') {
2254 strlcpy(atfile, word+1, sizeof(atfile));
2255 if ((sf = fopen(atfile, "r")) == NULL) {
2256 warn("can't open indirect secret file %s", atfile);
2259 check_access(sf, atfile);
2260 if (!getword(sf, word, &xxx, atfile)) {
2261 warn("no secret in indirect secret file %s", atfile);
2267 strlcpy(lsecret, word, sizeof(lsecret));
2271 * Now read address authorization info and make a wordlist.
2275 if (!getword(f, word, &newline, filename) || newline)
2277 ap = (struct wordlist *)
2278 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2280 novm("authorized addresses");
2281 ap->word = (char *) (ap + 1);
2282 strcpy(ap->word, word);
2289 * This is the best so far; remember it.
2291 best_flag = got_flag;
2293 free_wordlist(addr_list);
2296 strlcpy(secret, lsecret, MAXWORDLEN);
2302 /* scan for a -- word indicating the start of options */
2303 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2304 if (strcmp(ap->word, "--") == 0)
2306 /* ap = start of options */
2308 ap = ap->next; /* first option */
2309 free(*app); /* free the "--" word */
2310 *app = NULL; /* terminate addr list */
2314 else if (ap != NULL)
2318 else if (addr_list != NULL)
2319 free_wordlist(addr_list);
2325 * wordlist_count - return the number of items in a wordlist
2328 wordlist_count(struct wordlist *wp)
2332 for (n = 0; wp != NULL; wp = wp->next)
2338 * free_wordlist - release memory allocated for a wordlist.
2341 free_wordlist(struct wordlist *wp)
2343 struct wordlist *next;
2345 while (wp != NULL) {
2353 * auth_script_done - called when the auth-up or auth-down script
2357 auth_script_done(void *arg)
2359 auth_script_pid = 0;
2360 switch (auth_script_state) {
2362 if (auth_state == s_down) {
2363 auth_script_state = s_down;
2364 auth_script(_PATH_AUTHDOWN);
2368 if (auth_state == s_up) {
2369 auth_script_state = s_up;
2370 auth_script(_PATH_AUTHUP);
2377 * auth_script - execute a script with arguments
2378 * interface-name peer-name real-user tty speed
2381 auth_script(char *script)
2389 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2390 user_name = pw->pw_name;
2392 slprintf(struid, sizeof(struid), "%d", getuid());
2395 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2399 argv[2] = peer_authname;
2400 argv[3] = user_name;
2405 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL, 0);
2411 have_eaptls_secret_server(char *client, char *server,
2412 int need_ip, int *lacks_ipp)
2417 struct wordlist *addrs;
2418 char servcertfile[MAXWORDLEN];
2419 char clicertfile[MAXWORDLEN];
2420 char cacertfile[MAXWORDLEN];
2421 char pkfile[MAXWORDLEN];
2423 filename = _PATH_EAPTLSSERVFILE;
2424 f = fopen(filename, "r");
2428 if (client != NULL && client[0] == 0)
2430 else if (server != NULL && server[0] == 0)
2434 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2435 cacertfile, pkfile, &addrs, NULL, filename,
2441 if (ret >= 0 && !eaptls_init_ssl(1, cacertfile, servcertfile,
2442 clicertfile, pkfile))
2446 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
2452 free_wordlist(addrs);
2459 have_eaptls_secret_client(char *client, char *server)
2464 struct wordlist *addrs = NULL;
2465 char servcertfile[MAXWORDLEN];
2466 char clicertfile[MAXWORDLEN];
2467 char cacertfile[MAXWORDLEN];
2468 char pkfile[MAXWORDLEN];
2470 if (client != NULL && client[0] == 0)
2472 else if (server != NULL && server[0] == 0)
2475 if ((cacert_file || ca_path) && cert_file && privkey_file)
2480 filename = _PATH_EAPTLSCLIFILE;
2481 f = fopen(filename, "r");
2486 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2487 cacertfile, pkfile, &addrs, NULL, filename,
2492 if (ret >= 0 && !eaptls_init_ssl(0, cacertfile, clicertfile,
2493 servcertfile, pkfile))
2498 free_wordlist(addrs);
2505 scan_authfile_eaptls(FILE *f, char *client, char *server,
2506 char *cli_cert, char *serv_cert, char *ca_cert,
2507 char *pk, struct wordlist **addrs,
2508 struct wordlist **opts,
2509 char *filename, int flags)
2512 int got_flag, best_flag;
2513 struct wordlist *ap, *addr_list, *alist, **app;
2514 char word[MAXWORDLEN];
2521 if (!getword(f, word, &newline, filename))
2522 return -1; /* file is empty??? */
2527 * Skip until we find a word at the start of a line.
2529 while (!newline && getword(f, word, &newline, filename));
2531 break; /* got to end of file */
2534 * Got a client - check if it's a match or a wildcard.
2537 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2542 got_flag = NONWILD_CLIENT;
2545 * Now get a server and check if it matches.
2547 if (!getword(f, word, &newline, filename))
2551 if (!ISWILD(word)) {
2552 if (server != NULL && strcmp(word, server) != 0)
2554 got_flag |= NONWILD_SERVER;
2558 * Got some sort of a match - see if it's better than what
2561 if (got_flag <= best_flag)
2567 if (!getword(f, word, &newline, filename))
2571 if (strcmp(word, "-") != 0) {
2572 strlcpy(cli_cert, word, MAXWORDLEN);
2579 if (!getword(f, word, &newline, filename))
2583 if (strcmp(word, "-") != 0) {
2584 strlcpy(serv_cert, word, MAXWORDLEN);
2591 if (!getword(f, word, &newline, filename))
2595 strlcpy(ca_cert, word, MAXWORDLEN);
2600 if (!getword(f, word, &newline, filename))
2604 strlcpy(pk, word, MAXWORDLEN);
2608 * Now read address authorization info and make a wordlist.
2612 if (!getword(f, word, &newline, filename) || newline)
2614 ap = (struct wordlist *)
2615 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2617 novm("authorized addresses");
2618 ap->word = (char *) (ap + 1);
2619 strcpy(ap->word, word);
2625 * This is the best so far; remember it.
2627 best_flag = got_flag;
2629 free_wordlist(addr_list);
2636 /* scan for a -- word indicating the start of options */
2637 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2638 if (strcmp(ap->word, "--") == 0)
2640 /* ap = start of options */
2642 ap = ap->next; /* first option */
2643 free(*app); /* free the "--" word */
2644 *app = NULL; /* terminate addr list */
2648 else if (ap != NULL)
2652 else if (addr_list != NULL)
2653 free_wordlist(addr_list);
2660 get_eaptls_secret(int unit, char *client, char *server,
2661 char *clicertfile, char *servcertfile, char *cacertfile,
2662 char *capath, char *pkfile, char *pkcs12, int am_server)
2666 char *filename = NULL;
2667 struct wordlist *addrs = NULL;
2668 struct wordlist *opts = NULL;
2670 /* maybe overkill, but it eases debugging */
2671 bzero(clicertfile, MAXWORDLEN);
2672 bzero(servcertfile, MAXWORDLEN);
2673 bzero(cacertfile, MAXWORDLEN);
2674 bzero(capath, MAXWORDLEN);
2675 bzero(pkfile, MAXWORDLEN);
2676 bzero(pkcs12, MAXWORDLEN);
2678 /* the ca+cert+privkey can also be specified as options */
2679 if (!am_server && (cacert_file || ca_path) && cert_file && privkey_file )
2681 strlcpy( clicertfile, cert_file, MAXWORDLEN );
2683 strlcpy( cacertfile, cacert_file, MAXWORDLEN );
2685 strlcpy( capath, ca_path, MAXWORDLEN );
2686 strlcpy( pkfile, privkey_file, MAXWORDLEN );
2688 else if (!am_server && pkcs12_file)
2690 strlcpy( pkcs12, pkcs12_file, MAXWORDLEN );
2692 strlcpy( cacertfile, cacert_file, MAXWORDLEN );
2694 strlcpy( capath, ca_path, MAXWORDLEN );
2698 filename = (am_server ? _PATH_EAPTLSSERVFILE : _PATH_EAPTLSCLIFILE);
2701 fp = fopen(filename, "r");
2704 error("Can't open eap-tls secret file %s: %m", filename);
2708 check_access(fp, filename);
2710 ret = scan_authfile_eaptls(fp, client, server, clicertfile, servcertfile,
2711 cacertfile, pkfile, &addrs, &opts, filename, 0);
2715 if (ret < 0) return 0;
2718 if (eaptls_passwd_hook)
2720 dbglog( "Calling eaptls password hook" );
2721 if ( (*eaptls_passwd_hook)(pkfile, passwd) < 0)
2723 error("Unable to obtain EAP-TLS password for %s (%s) from plugin",
2729 set_allowed_addrs(unit, addrs, opts);
2730 else if (opts != NULL)
2731 free_wordlist(opts);
2733 free_wordlist(addrs);