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 PPP_WITH_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 */
247 #ifdef PPP_WITH_CHAPMS
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 #if defined(USE_EAPTLS) || defined(USE_PEAP)
263 char *cacert_file = NULL; /* CA certificate file (pem format) */
264 char *ca_path = NULL; /* Directory with CA certificates */
265 char *crl_dir = NULL; /* Directory containing CRL files */
266 char *crl_file = NULL; /* Certificate Revocation List (CRL) file (pem format) */
267 char *max_tls_version = NULL; /* Maximum TLS protocol version (default=1.2) */
268 char *tls_verify_method = NULL; /* Verify certificate method */
269 bool tls_verify_key_usage = 0; /* Verify peer certificate key usage */
272 #if defined(USE_EAPTLS)
273 char *cert_file = NULL; /* Client certificate file (pem format) */
274 char *privkey_file = NULL; /* Client private key file (pem format) */
275 char *pkcs12_file = NULL; /* Client private key envelope file (pkcs12 format) */
276 bool need_peer_eap = 0; /* Require peer to authenticate us */
279 static char *uafname; /* name of most recent +ua file */
281 /* Prototypes for procedures local to this file. */
283 static void network_phase (int);
284 static void check_idle (void *);
285 static void connect_time_expired (void *);
286 static int null_login (int);
287 static int get_pap_passwd (char *);
288 static int have_pap_secret (int *);
289 static int have_chap_secret (char *, char *, int, int *);
290 static int have_srp_secret(char *client, char *server, int need_ip,
294 static int have_eaptls_secret_server
295 (char *client, char *server, int need_ip, int *lacks_ipp);
296 static int have_eaptls_secret_client (char *client, char *server);
297 static int scan_authfile_eaptls(FILE * f, char *client, char *server,
298 char *cli_cert, char *serv_cert,
299 char *ca_cert, char *pk,
300 struct wordlist ** addrs,
301 struct wordlist ** opts,
302 char *filename, int flags);
305 static int ip_addr_check (u_int32_t, struct permitted_ip *);
306 static int scan_authfile(FILE *, char *, char *, char *,
307 struct wordlist **, struct wordlist **,
309 static void free_wordlist (struct wordlist *);
310 static void auth_script (char *);
311 static void auth_script_done (void *);
312 static void set_allowed_addrs (int, struct wordlist *, struct wordlist *);
313 static int some_ip_ok (struct wordlist *);
314 static int setupapfile (char **);
315 static int privgroup (char **);
316 static int set_noauth_addr (char **);
317 static int set_permitted_number (char **);
318 static void check_access (FILE *, char *);
319 static int wordlist_count (struct wordlist *);
322 static void check_maxoctets (void *);
326 * Authentication-related options.
328 option_t auth_options[] = {
329 { "auth", o_bool, &auth_required,
330 "Require authentication from peer", OPT_PRIO | 1 },
331 { "noauth", o_bool, &auth_required,
332 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
334 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
335 "Require PAP authentication from peer",
336 OPT_PRIOSUB | 1, &auth_required },
337 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
338 "Require PAP authentication from peer",
339 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
340 { "require-chap", o_bool, &auth_required,
341 "Require CHAP authentication from peer",
342 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
343 &lcp_wantoptions[0].chap_mdtype },
344 { "+chap", o_bool, &auth_required,
345 "Require CHAP authentication from peer",
346 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
347 &lcp_wantoptions[0].chap_mdtype },
348 #ifdef PPP_WITH_CHAPMS
349 { "require-mschap", o_bool, &auth_required,
350 "Require MS-CHAP authentication from peer",
351 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
352 &lcp_wantoptions[0].chap_mdtype },
353 { "+mschap", o_bool, &auth_required,
354 "Require MS-CHAP authentication from peer",
355 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
356 &lcp_wantoptions[0].chap_mdtype },
357 { "require-mschap-v2", o_bool, &auth_required,
358 "Require MS-CHAPv2 authentication from peer",
359 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
360 &lcp_wantoptions[0].chap_mdtype },
361 { "+mschap-v2", o_bool, &auth_required,
362 "Require MS-CHAPv2 authentication from peer",
363 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
364 &lcp_wantoptions[0].chap_mdtype },
367 { "refuse-pap", o_bool, &refuse_pap,
368 "Don't agree to auth to peer with PAP", 1 },
369 { "-pap", o_bool, &refuse_pap,
370 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
371 { "refuse-chap", o_bool, &refuse_chap,
372 "Don't agree to auth to peer with CHAP",
373 OPT_A2CLRB | MDTYPE_MD5,
374 &lcp_allowoptions[0].chap_mdtype },
375 { "-chap", o_bool, &refuse_chap,
376 "Don't allow CHAP authentication with peer",
377 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
378 &lcp_allowoptions[0].chap_mdtype },
379 #ifdef PPP_WITH_CHAPMS
380 { "refuse-mschap", o_bool, &refuse_mschap,
381 "Don't agree to auth to peer with MS-CHAP",
382 OPT_A2CLRB | MDTYPE_MICROSOFT,
383 &lcp_allowoptions[0].chap_mdtype },
384 { "-mschap", o_bool, &refuse_mschap,
385 "Don't allow MS-CHAP authentication with peer",
386 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
387 &lcp_allowoptions[0].chap_mdtype },
388 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
389 "Don't agree to auth to peer with MS-CHAPv2",
390 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
391 &lcp_allowoptions[0].chap_mdtype },
392 { "-mschap-v2", o_bool, &refuse_mschap_v2,
393 "Don't allow MS-CHAPv2 authentication with peer",
394 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
395 &lcp_allowoptions[0].chap_mdtype },
398 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
399 "Require EAP authentication from peer", OPT_PRIOSUB | 1,
401 { "refuse-eap", o_bool, &refuse_eap,
402 "Don't agree to authenticate to peer with EAP", 1 },
404 { "name", o_string, our_name,
405 "Set local name for authentication",
406 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
408 { "+ua", o_special, (void *)setupapfile,
409 "Get PAP user and password from file",
410 OPT_PRIO | OPT_A2STRVAL, &uafname },
412 { "user", o_string, user,
413 "Set name for auth with peer", OPT_PRIO | OPT_STATIC,
414 &explicit_user, MAXNAMELEN },
416 { "password", o_string, passwd,
417 "Password for authenticating us to the peer",
418 OPT_PRIO | OPT_STATIC | OPT_HIDE,
419 &explicit_passwd, MAXSECRETLEN },
421 { "usehostname", o_bool, &usehostname,
422 "Must use hostname for authentication", 1 },
424 { "remotename", o_string, remote_name,
425 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
426 &explicit_remote, MAXNAMELEN },
428 { "login", o_bool, &uselogin,
429 "Use system password database for PAP", OPT_A2COPY | 1 ,
431 { "enable-session", o_bool, &session_mgmt,
432 "Enable session accounting for remote peers", OPT_PRIV | 1 },
434 { "papcrypt", o_bool, &cryptpap,
435 "PAP passwords are encrypted", 1 },
437 { "privgroup", o_special, (void *)privgroup,
438 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
440 { "allow-ip", o_special, (void *)set_noauth_addr,
441 "Set IP address(es) which can be used without authentication",
442 OPT_PRIV | OPT_A2LIST },
444 { "remotenumber", o_string, remote_number,
445 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
448 { "allow-number", o_special, (void *)set_permitted_number,
449 "Set telephone number(s) which are allowed to connect",
450 OPT_PRIV | OPT_A2LIST },
452 #if defined(USE_EAPTLS) || defined(USE_PEAP)
453 { "ca", o_string, &cacert_file, "CA certificate in PEM format" },
454 { "capath", o_string, &ca_path, "TLS CA certificate directory" },
455 { "crl-dir", o_string, &crl_dir, "Use CRLs in directory" },
456 { "crl", o_string, &crl_file, "Use specific CRL file" },
457 { "max-tls-version", o_string, &max_tls_version,
458 "Maximum TLS version (1.0/1.1/1.2 (default)/1.3)" },
459 { "tls-verify-key-usage", o_bool, &tls_verify_key_usage,
460 "Verify certificate type and extended key usage" },
461 { "tls-verify-method", o_string, &tls_verify_method,
462 "Verify peer by method (none|subject|name|suffix)" },
465 #if defined(USE_EAPTLS)
466 { "cert", o_string, &cert_file, "client certificate in PEM format" },
467 { "key", o_string, &privkey_file, "client private key in PEM format" },
468 { "pkcs12", o_string, &pkcs12_file, "EAP-TLS client credentials in PKCS12 format" },
469 { "need-peer-eap", o_bool, &need_peer_eap,
470 "Require the peer to authenticate us", 1 },
476 * setupapfile - specifies UPAP info for authenticating with peer.
479 setupapfile(char **argv)
484 char u[MAXNAMELEN], p[MAXSECRETLEN];
487 lcp_allowoptions[0].neg_upap = 1;
489 /* open user info file */
490 fname = strdup(*argv);
492 novm("+ua file name");
494 if (seteuid(getuid()) == -1) {
495 option_error("unable to reset uid before opening %s: %m", fname);
499 ufile = fopen(fname, "r");
500 if (seteuid(euid) == -1)
501 fatal("unable to regain privileges: %m");
503 option_error("unable to open user login data file %s", fname);
507 check_access(ufile, fname);
511 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
512 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
514 option_error("unable to read user login data file %s", fname);
520 /* get rid of newlines */
522 if (l > 0 && u[l-1] == '\n')
525 if (l > 0 && p[l-1] == '\n')
528 if (override_value("user", option_priority, fname)) {
529 strlcpy(user, u, sizeof(user));
532 if (override_value("passwd", option_priority, fname)) {
533 strlcpy(passwd, p, sizeof(passwd));
543 * privgroup - allow members of the group to have privileged access.
546 privgroup(char **argv)
553 option_error("group %s is unknown", *argv);
556 for (i = 0; i < ngroups; ++i) {
557 if (groups[i] == g->gr_gid) {
567 * set_noauth_addr - set address(es) that can be used without authentication.
568 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
571 set_noauth_addr(char **argv)
574 int l = strlen(addr) + 1;
577 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
579 novm("allow-ip argument");
580 wp->word = (char *) (wp + 1);
581 wp->next = noauth_addrs;
582 BCOPY(addr, wp->word, l);
589 * set_permitted_number - set remote telephone number(s) that may connect.
592 set_permitted_number(char **argv)
594 char *number = *argv;
595 int l = strlen(number) + 1;
598 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
600 novm("allow-number argument");
601 wp->word = (char *) (wp + 1);
602 wp->next = permitted_numbers;
603 BCOPY(number, wp->word, l);
604 permitted_numbers = wp;
610 * An Open on LCP has requested a change from Dead to Establish phase.
613 link_required(int unit)
618 * Bring the link up to the point of being able to do ppp.
620 void start_link(int unit)
622 status = EXIT_CONNECT_FAILED;
623 new_phase(PHASE_SERIALCONN);
626 devfd = the_channel->connect();
630 /* set up the serial device as a ppp interface */
632 * N.B. we used to do tdb_writelock/tdb_writeunlock around this
633 * (from establish_ppp to set_ifunit). However, we won't be
634 * doing the set_ifunit in multilink mode, which is the only time
635 * we need the atomicity that the tdb_writelock/tdb_writeunlock
636 * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock.
638 fd_ppp = the_channel->establish_ppp(devfd);
640 status = EXIT_FATAL_ERROR;
644 if (!demand && ifunit >= 0)
648 * Start opening the connection and wait for
649 * incoming events (reply, timeout, etc.).
652 notice("Connect: %s <--> %s", ifname, ppp_devnam);
654 notice("Starting negotiation on %s", ppp_devnam);
657 status = EXIT_NEGOTIATION_FAILED;
658 new_phase(PHASE_ESTABLISH);
664 new_phase(PHASE_DISCONNECT);
665 if (the_channel->disconnect)
666 the_channel->disconnect();
669 new_phase(PHASE_DEAD);
670 if (the_channel->cleanup)
671 (*the_channel->cleanup)();
675 * LCP has terminated the link; go to the Dead phase and take the
676 * physical layer down.
679 link_terminated(int unit)
681 if (phase == PHASE_DEAD || phase == PHASE_MASTER)
683 new_phase(PHASE_DISCONNECT);
685 if (pap_logout_hook) {
690 if (!doing_multilink) {
691 notice("Connection terminated.");
694 notice("Link terminated.");
697 * Delete pid files before disestablishing ppp. Otherwise it
698 * can happen that another pppd gets the same unit and then
699 * we delete its pid file.
701 if (!doing_multilink && !demand)
705 * If we may want to bring the link up again, transfer
706 * the ppp unit back to the loopback. Set the
707 * real serial device back to its normal mode of operation.
712 the_channel->disestablish_ppp(devfd);
719 if (!doing_multilink && !demand)
720 script_unsetenv("IFNAME");
723 * Run disconnector script, if requested.
724 * XXX we may not be able to do this if the line has hung up!
726 if (devfd >= 0 && the_channel->disconnect) {
727 the_channel->disconnect();
730 if (the_channel->cleanup)
731 (*the_channel->cleanup)();
733 if (doing_multilink && multilink_master) {
734 if (!bundle_terminating) {
735 new_phase(PHASE_MASTER);
736 if (master_detach && !detached)
739 mp_bundle_terminated();
741 new_phase(PHASE_DEAD);
745 * LCP has gone down; it will either die or try to re-establish.
750 if (auth_state != s_down) {
751 notify(link_down_notifier, 0);
753 if (auth_script_state == s_up && auth_script_pid == 0) {
754 update_link_stats(unit);
755 auth_script_state = s_down;
756 auth_script(_PATH_AUTHDOWN);
759 if (!doing_multilink) {
760 upper_layers_down(unit);
761 if (phase != PHASE_DEAD && phase != PHASE_MASTER)
762 new_phase(PHASE_ESTABLISH);
764 /* XXX if doing_multilink, should do something to stop
765 network-layer traffic on the link */
768 void upper_layers_down(int unit)
771 struct protent *protp;
773 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
774 if (!protp->enabled_flag)
776 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
777 (*protp->lowerdown)(unit);
778 if (protp->protocol < 0xC000 && protp->close != NULL)
779 (*protp->close)(unit, "LCP down");
786 * The link is established.
787 * Proceed to the Dead, Authenticate or Network phase as appropriate.
790 link_established(int unit)
793 lcp_options *wo = &lcp_wantoptions[unit];
794 lcp_options *go = &lcp_gotoptions[unit];
795 lcp_options *ho = &lcp_hisoptions[unit];
797 lcp_options *ao = &lcp_allowoptions[unit];
800 struct protent *protp;
803 * Tell higher-level protocols that LCP is up.
805 if (!doing_multilink) {
806 for (i = 0; (protp = protocols[i]) != NULL; ++i)
807 if (protp->protocol != PPP_LCP && protp->enabled_flag
808 && protp->lowerup != NULL)
809 (*protp->lowerup)(unit);
812 if (!auth_required && noauth_addrs != NULL)
813 set_allowed_addrs(unit, NULL, NULL);
815 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) {
817 * We wanted the peer to authenticate itself, and it refused:
818 * if we have some address(es) it can use without auth, fine,
819 * otherwise treat it as though it authenticated with PAP using
820 * a username of "" and a password of "". If that's not OK,
823 if (noauth_addrs != NULL) {
824 set_allowed_addrs(unit, NULL, NULL);
825 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
826 warn("peer refused to authenticate: terminating link");
827 status = EXIT_PEER_AUTH_FAILED;
828 lcp_close(unit, "peer refused to authenticate");
834 if (need_peer_eap && !ao->neg_eap) {
835 warn("eap required to authenticate us but no suitable secrets");
836 lcp_close(unit, "couldn't negotiate eap");
837 status = EXIT_AUTH_TOPEER_FAILED;
841 if (need_peer_eap && !ho->neg_eap) {
842 warn("peer doesn't want to authenticate us with eap");
843 lcp_close(unit, "couldn't negotiate eap");
844 status = EXIT_PEER_AUTH_FAILED;
849 new_phase(PHASE_AUTHENTICATE);
852 eap_authpeer(unit, our_name);
854 } else if (go->neg_chap) {
855 chap_auth_peer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
857 } else if (go->neg_upap) {
862 eap_authwithpeer(unit, user);
863 auth |= EAP_WITHPEER;
864 } else if (ho->neg_chap) {
865 chap_auth_with_peer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
866 auth |= CHAP_WITHPEER;
867 } else if (ho->neg_upap) {
868 /* If a blank password was explicitly given as an option, trust
869 the user and don't try to look up one. */
870 if (passwd[0] == 0 && !explicit_passwd) {
871 passwd_from_file = 1;
872 if (!get_pap_passwd(passwd))
873 error("No secret found for PAP login");
875 upap_authwithpeer(unit, user, passwd);
876 auth |= PAP_WITHPEER;
878 auth_pending[unit] = auth;
886 * Proceed to the network phase.
889 network_phase(int unit)
891 lcp_options *go = &lcp_gotoptions[unit];
893 /* Log calling number. */
895 notice("peer from calling number %q authorized", remote_number);
898 * If the peer had to authenticate, run the auth-up script now.
900 notify(auth_up_notifier, 0);
901 if (go->neg_chap || go->neg_upap || go->neg_eap) {
903 if (auth_script_state == s_down && auth_script_pid == 0) {
904 auth_script_state = s_up;
905 auth_script(_PATH_AUTHUP);
911 * If we negotiated callback, do it now.
914 new_phase(PHASE_CALLBACK);
915 (*cbcp_protent.open)(unit);
921 * Process extra options from the secrets file
924 options_from_list(extra_options, 1);
925 free_wordlist(extra_options);
928 start_networks(unit);
932 start_networks(int unit)
935 struct protent *protp;
936 int ecp_required, mppe_required;
938 new_phase(PHASE_NETWORK);
940 #ifdef PPP_WITH_MULTILINK
942 if (mp_join_bundle()) {
943 if (multilink_join_hook)
944 (*multilink_join_hook)();
945 if (updetach && !nodetach)
950 #endif /* PPP_WITH_MULTILINK */
952 #ifdef PPP_WITH_FILTER
954 set_filters(&pass_filter, &active_filter);
956 /* Start CCP and ECP */
957 for (i = 0; (protp = protocols[i]) != NULL; ++i)
958 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
959 && protp->enabled_flag && protp->open != NULL)
963 * Bring up other network protocols iff encryption is not required.
965 ecp_required = ecp_gotoptions[unit].required;
966 mppe_required = ccp_gotoptions[unit].mppe;
967 if (!ecp_required && !mppe_required)
968 continue_networks(unit);
972 continue_networks(int unit)
975 struct protent *protp;
978 * Start the "real" network protocols.
980 for (i = 0; (protp = protocols[i]) != NULL; ++i)
981 if (protp->protocol < 0xC000
982 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
983 && protp->enabled_flag && protp->open != NULL) {
988 if (num_np_open == 0)
990 lcp_close(0, "No network protocols running");
994 * The peer has failed to authenticate himself using `protocol'.
997 auth_peer_fail(int unit, int protocol)
1000 * Authentication failure: take the link down
1002 status = EXIT_PEER_AUTH_FAILED;
1003 lcp_close(unit, "Authentication failed");
1007 * The peer has been successfully authenticated using `protocol'.
1010 auth_peer_success(int unit, int protocol, int prot_flavor,
1011 char *name, int namelen)
1018 switch (prot_flavor) {
1020 bit |= CHAP_MD5_PEER;
1022 #ifdef PPP_WITH_CHAPMS
1023 case CHAP_MICROSOFT:
1024 bit |= CHAP_MS_PEER;
1026 case CHAP_MICROSOFT_V2:
1027 bit |= CHAP_MS2_PEER;
1039 warn("auth_peer_success: unknown protocol %x", protocol);
1044 * Save the authenticated name of the peer for later.
1046 if (namelen > sizeof(peer_authname) - 1)
1047 namelen = sizeof(peer_authname) - 1;
1048 BCOPY(name, peer_authname, namelen);
1049 peer_authname[namelen] = 0;
1050 script_setenv("PEERNAME", peer_authname, 0);
1052 /* Save the authentication method for later. */
1053 auth_done[unit] |= bit;
1056 * If there is no more authentication still to be done,
1057 * proceed to the network (or callback) phase.
1059 if ((auth_pending[unit] &= ~bit) == 0)
1060 network_phase(unit);
1064 * We have failed to authenticate ourselves to the peer using `protocol'.
1067 auth_withpeer_fail(int unit, int protocol)
1069 if (passwd_from_file)
1070 BZERO(passwd, MAXSECRETLEN);
1072 * We've failed to authenticate ourselves to our peer.
1073 * Some servers keep sending CHAP challenges, but there
1074 * is no point in persisting without any way to get updated
1075 * authentication secrets.
1077 status = EXIT_AUTH_TOPEER_FAILED;
1078 lcp_close(unit, "Failed to authenticate ourselves to peer");
1082 * We have successfully authenticated ourselves with the peer using `protocol'.
1085 auth_withpeer_success(int unit, int protocol, int prot_flavor)
1088 const char *prot = "";
1092 bit = CHAP_WITHPEER;
1094 switch (prot_flavor) {
1096 bit |= CHAP_MD5_WITHPEER;
1098 #ifdef PPP_WITH_CHAPMS
1099 case CHAP_MICROSOFT:
1100 bit |= CHAP_MS_WITHPEER;
1102 case CHAP_MICROSOFT_V2:
1103 bit |= CHAP_MS2_WITHPEER;
1109 if (passwd_from_file)
1110 BZERO(passwd, MAXSECRETLEN);
1119 warn("auth_withpeer_success: unknown protocol %x", protocol);
1123 notice("%s authentication succeeded", prot);
1125 /* Save the authentication method for later. */
1126 auth_done[unit] |= bit;
1129 * If there is no more authentication still being done,
1130 * proceed to the network (or callback) phase.
1132 if ((auth_pending[unit] &= ~bit) == 0)
1133 network_phase(unit);
1138 * np_up - a network protocol has come up.
1141 np_up(int unit, int proto)
1145 if (num_np_up == 0) {
1147 * At this point we consider that the link has come up successfully.
1151 new_phase(PHASE_RUNNING);
1153 if (idle_time_hook != 0)
1154 tlim = (*idle_time_hook)(NULL);
1156 tlim = idle_time_limit;
1158 TIMEOUT(check_idle, NULL, tlim);
1161 * Set a timeout to close the connection once the maximum
1162 * connect time has expired.
1165 TIMEOUT(connect_time_expired, 0, maxconnect);
1169 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1173 * Detach now, if the updetach option was given.
1175 if (updetach && !nodetach) {
1176 dbglog("updetach is set. Now detaching.");
1179 } else if (nodetach && up_sdnotify) {
1180 dbglog("up_sdnotify is set. Now notifying systemd: READY=1");
1181 sd_notify(0, "READY=1");
1189 * np_down - a network protocol has gone down.
1192 np_down(int unit, int proto)
1194 if (--num_np_up == 0) {
1195 UNTIMEOUT(check_idle, NULL);
1196 UNTIMEOUT(connect_time_expired, NULL);
1198 UNTIMEOUT(check_maxoctets, NULL);
1200 new_phase(PHASE_NETWORK);
1205 * np_finished - a network protocol has finished using the link.
1208 np_finished(int unit, int proto)
1210 if (--num_np_open <= 0) {
1211 /* no further use for the link: shut up shop. */
1212 lcp_close(0, "No network protocols running");
1218 check_maxoctets(void *arg)
1222 update_link_stats(ifunit);
1225 switch(maxoctets_dir) {
1226 case PPP_OCTETS_DIRECTION_IN:
1227 used = link_stats.bytes_in;
1229 case PPP_OCTETS_DIRECTION_OUT:
1230 used = link_stats.bytes_out;
1232 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1233 case PPP_OCTETS_DIRECTION_MAXSESSION:
1234 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1237 used = link_stats.bytes_in+link_stats.bytes_out;
1240 if (used > maxoctets) {
1241 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1242 status = EXIT_TRAFFIC_LIMIT;
1243 lcp_close(0, "Traffic limit");
1246 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1252 * check_idle - check whether the link has been idle for long
1253 * enough that we can shut it down.
1256 check_idle(void *arg)
1258 struct ppp_idle idle;
1262 if (!get_idle_time(0, &idle))
1264 if (idle_time_hook != 0) {
1265 tlim = idle_time_hook(&idle);
1267 itime = MIN(idle.xmit_idle, idle.recv_idle);
1268 tlim = idle_time_limit - itime;
1271 /* link is idle: shut it down. */
1272 notice("Terminating connection due to lack of activity.");
1273 status = EXIT_IDLE_TIMEOUT;
1274 lcp_close(0, "Link inactive");
1277 TIMEOUT(check_idle, NULL, tlim);
1282 * connect_time_expired - log a message and close the connection.
1285 connect_time_expired(void *arg)
1287 info("Connect time expired");
1288 status = EXIT_CONNECT_TIME;
1289 lcp_close(0, "Connect time expired"); /* Close connection */
1293 * auth_check_options - called to check authentication options.
1296 auth_check_options(void)
1298 lcp_options *wo = &lcp_wantoptions[0];
1302 /* Default our_name to hostname, and user to our_name */
1303 if (our_name[0] == 0 || usehostname)
1304 strlcpy(our_name, hostname, sizeof(our_name));
1305 /* If a blank username was explicitly given as an option, trust
1306 the user and don't use our_name */
1307 if (user[0] == 0 && !explicit_user)
1308 strlcpy(user, our_name, sizeof(user));
1311 * If we have a default route, require the peer to authenticate
1312 * unless the noauth option was given or the real user is root.
1314 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1319 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1320 if (wo->chap_mdtype)
1323 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1324 if (auth_required) {
1326 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) {
1327 wo->neg_chap = chap_mdtype_all != MDTYPE_NONE;
1328 wo->chap_mdtype = chap_mdtype_all;
1334 wo->chap_mdtype = MDTYPE_NONE;
1340 * Check whether we have appropriate secrets to use
1341 * to authenticate the peer. Note that EAP can authenticate by way
1342 * of a CHAP-like exchanges as well as SRP.
1345 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1346 if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
1347 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1348 our_name, 1, &lacks_ip);
1350 if (!can_auth && wo->neg_eap) {
1351 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1352 our_name, 1, &lacks_ip);
1356 if (!can_auth && wo->neg_eap) {
1358 have_eaptls_secret_server((explicit_remote ? remote_name :
1359 NULL), our_name, 1, &lacks_ip);
1364 if (auth_required && !can_auth && noauth_addrs == NULL) {
1367 "By default the remote system is required to authenticate itself");
1369 "(because this system has a default route to the internet)");
1370 } else if (explicit_remote)
1372 "The remote system (%s) is required to authenticate itself",
1376 "The remote system is required to authenticate itself");
1378 "but I couldn't find any suitable secret (password) for it to use to do so.");
1381 "(None of the available passwords would let it use an IP address.)");
1387 * Early check for remote number authorization.
1389 if (!auth_number()) {
1390 warn("calling number %q is not authorized", remote_number);
1391 exit(EXIT_CNID_AUTH_FAILED);
1396 * auth_reset - called when LCP is starting negotiations to recheck
1397 * authentication options, i.e. whether we have appropriate secrets
1398 * to use for authenticating ourselves and/or the peer.
1401 auth_reset(int unit)
1403 lcp_options *go = &lcp_gotoptions[unit];
1404 lcp_options *ao = &lcp_allowoptions[unit];
1408 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1409 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1410 && ((passwd[0] != 0 || explicit_passwd) ||
1411 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1413 ao->neg_eap = !refuse_eap && (
1415 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1416 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1417 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL)
1419 || have_eaptls_secret_client(user, (explicit_remote? remote_name: NULL))
1424 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1427 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1428 our_name, 1, NULL)))
1432 (hadchap == 0 || (hadchap == -1 &&
1433 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1435 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1438 && !have_eaptls_secret_server((explicit_remote? remote_name: NULL),
1447 * check_passwd - Check the user name and passwd against the PAP secrets
1448 * file. If requested, also check against the system password database,
1449 * and login the user if OK.
1452 * UPAP_AUTHNAK: Authentication failed.
1453 * UPAP_AUTHACK: Authentication succeeded.
1454 * In either case, msg points to an appropriate message.
1457 check_passwd(int unit,
1458 char *auser, int userlen,
1459 char *apasswd, int passwdlen, char **msg)
1464 struct wordlist *addrs = NULL, *opts = NULL;
1465 char passwd[256], user[256];
1466 char secret[MAXWORDLEN];
1467 static int attempts = 0;
1470 * Make copies of apasswd and auser, then null-terminate them.
1471 * If there are unprintable characters in the password, make
1474 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1475 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1479 * Check if a plugin wants to handle this.
1481 if (pap_auth_hook) {
1482 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1484 /* note: set_allowed_addrs() saves opts (but not addrs):
1487 set_allowed_addrs(unit, addrs, opts);
1489 free_wordlist(opts);
1491 free_wordlist(addrs);
1492 BZERO(passwd, sizeof(passwd));
1493 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1498 * Open the file of pap secrets and scan for a suitable secret
1499 * for authenticating this user.
1501 filename = _PATH_UPAPFILE;
1502 addrs = opts = NULL;
1504 f = fopen(filename, "r");
1506 error("Can't open PAP password file %s: %m", filename);
1509 check_access(f, filename);
1510 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1511 warn("no PAP secret found for %s", user);
1514 * If the secret is "@login", it means to check
1515 * the password against the login database.
1517 int login_secret = strcmp(secret, "@login") == 0;
1519 if (uselogin || login_secret) {
1520 /* login option or secret is @login */
1521 if (session_full(user, passwd, devnam, msg) == 0) {
1524 } else if (session_mgmt) {
1525 if (session_check(user, NULL, devnam, NULL) == 0) {
1526 warn("Peer %q failed PAP Session verification", user);
1530 if (secret[0] != 0 && !login_secret) {
1531 /* password given in pap-secrets - must match */
1532 if (cryptpap || strcmp(passwd, secret) != 0) {
1534 char *cbuf = crypt(passwd, secret);
1535 if (!cbuf || strcmp(cbuf, secret) != 0)
1544 if (ret == UPAP_AUTHNAK) {
1546 *msg = "Login incorrect";
1548 * XXX can we ever get here more than once??
1549 * Frustrate passwd stealer programs.
1550 * Allow 10 tries, but start backing off after 3 (stolen from login).
1551 * On 10'th, drop the connection.
1553 if (attempts++ >= 10) {
1554 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1555 lcp_close(unit, "login failed");
1558 sleep((u_int) (attempts - 3) * 5);
1560 free_wordlist(opts);
1563 attempts = 0; /* Reset count */
1566 set_allowed_addrs(unit, addrs, opts);
1570 free_wordlist(addrs);
1571 BZERO(passwd, sizeof(passwd));
1572 BZERO(secret, sizeof(secret));
1578 * null_login - Check if a username of "" and a password of "" are
1579 * acceptable, and iff so, set the list of acceptable IP addresses
1583 null_login(int unit)
1588 struct wordlist *addrs, *opts;
1589 char secret[MAXWORDLEN];
1592 * Check if a plugin wants to handle this.
1596 ret = (*null_auth_hook)(&addrs, &opts);
1599 * Open the file of pap secrets and scan for a suitable secret.
1602 filename = _PATH_UPAPFILE;
1604 f = fopen(filename, "r");
1607 check_access(f, filename);
1609 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1610 ret = i >= 0 && secret[0] == 0;
1611 BZERO(secret, sizeof(secret));
1616 set_allowed_addrs(unit, addrs, opts);
1618 free_wordlist(opts);
1620 free_wordlist(addrs);
1627 * get_pap_passwd - get a password for authenticating ourselves with
1628 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1630 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1633 get_pap_passwd(char *passwd)
1638 char secret[MAXWORDLEN];
1641 * Check whether a plugin wants to supply this.
1643 if (pap_passwd_hook) {
1644 ret = (*pap_passwd_hook)(user, passwd);
1649 filename = _PATH_UPAPFILE;
1650 f = fopen(filename, "r");
1653 check_access(f, filename);
1654 ret = scan_authfile(f, user,
1655 (remote_name[0]? remote_name: NULL),
1656 secret, NULL, NULL, filename, 0);
1661 strlcpy(passwd, secret, MAXSECRETLEN);
1662 BZERO(secret, sizeof(secret));
1668 * have_pap_secret - check whether we have a PAP file with any
1669 * secrets that we could possibly use for authenticating the peer.
1672 have_pap_secret(int *lacks_ipp)
1677 struct wordlist *addrs;
1679 /* let the plugin decide, if there is one */
1680 if (pap_check_hook) {
1681 ret = (*pap_check_hook)();
1686 filename = _PATH_UPAPFILE;
1687 f = fopen(filename, "r");
1691 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1692 NULL, &addrs, NULL, filename, 0);
1694 if (ret >= 0 && !some_ip_ok(addrs)) {
1700 free_wordlist(addrs);
1707 * have_chap_secret - check whether we have a CHAP file with a
1708 * secret that we could possibly use for authenticating `client'
1709 * on `server'. Either can be the null string, meaning we don't
1710 * know the identity yet.
1713 have_chap_secret(char *client, char *server,
1714 int need_ip, int *lacks_ipp)
1719 struct wordlist *addrs;
1721 if (chap_check_hook) {
1722 ret = (*chap_check_hook)();
1728 filename = _PATH_CHAPFILE;
1729 f = fopen(filename, "r");
1733 if (client != NULL && client[0] == 0)
1735 else if (server != NULL && server[0] == 0)
1738 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1740 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1746 free_wordlist(addrs);
1753 * have_srp_secret - check whether we have a SRP file with a
1754 * secret that we could possibly use for authenticating `client'
1755 * on `server'. Either can be the null string, meaning we don't
1756 * know the identity yet.
1759 have_srp_secret(char *client, char *server, int need_ip, int *lacks_ipp)
1764 struct wordlist *addrs;
1766 filename = _PATH_SRPFILE;
1767 f = fopen(filename, "r");
1771 if (client != NULL && client[0] == 0)
1773 else if (server != NULL && server[0] == 0)
1776 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1778 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1784 free_wordlist(addrs);
1791 * get_secret - open the CHAP secret file and return the secret
1792 * for authenticating the given client on the given server.
1793 * (We could be either client or server).
1796 get_secret(int unit, char *client, char *server,
1797 char *secret, int *secret_len, int am_server)
1802 struct wordlist *addrs, *opts;
1803 char secbuf[MAXWORDLEN];
1805 if (!am_server && passwd[0] != 0) {
1806 strlcpy(secbuf, passwd, sizeof(secbuf));
1807 } else if (!am_server && chap_passwd_hook) {
1808 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1809 error("Unable to obtain CHAP password for %s on %s from plugin",
1814 filename = _PATH_CHAPFILE;
1818 f = fopen(filename, "r");
1820 error("Can't open chap secret file %s: %m", filename);
1823 check_access(f, filename);
1825 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1831 set_allowed_addrs(unit, addrs, opts);
1833 free_wordlist(opts);
1835 free_wordlist(addrs);
1838 len = strlen(secbuf);
1839 if (len > MAXSECRETLEN) {
1840 error("Secret for %s on %s is too long", client, server);
1843 BCOPY(secbuf, secret, len);
1844 BZERO(secbuf, sizeof(secbuf));
1852 * get_srp_secret - open the SRP secret file and return the secret
1853 * for authenticating the given client on the given server.
1854 * (We could be either client or server).
1857 get_srp_secret(int unit, char *client, char *server,
1858 char *secret, int am_server)
1863 struct wordlist *addrs, *opts;
1865 if (!am_server && passwd[0] != '\0') {
1866 strlcpy(secret, passwd, MAXWORDLEN);
1868 filename = _PATH_SRPFILE;
1871 fp = fopen(filename, "r");
1873 error("Can't open srp secret file %s: %m", filename);
1876 check_access(fp, filename);
1879 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
1880 filename, am_server);
1886 set_allowed_addrs(unit, addrs, opts);
1887 else if (opts != NULL)
1888 free_wordlist(opts);
1890 free_wordlist(addrs);
1897 * set_allowed_addrs() - set the list of allowed addresses.
1898 * Also looks for `--' indicating options to apply for this peer
1899 * and leaves the following words in extra_options.
1902 set_allowed_addrs(int unit, struct wordlist *addrs,
1903 struct wordlist *opts)
1906 struct wordlist *ap, **plink;
1907 struct permitted_ip *ip;
1908 char *ptr_word, *ptr_mask;
1911 u_int32_t a, mask, ah, offset;
1912 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1913 u_int32_t suggested_ip = 0;
1915 if (addresses[unit] != NULL)
1916 free(addresses[unit]);
1917 addresses[unit] = NULL;
1918 if (extra_options != NULL)
1919 free_wordlist(extra_options);
1920 extra_options = opts;
1923 * Count the number of IP addresses given.
1925 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
1928 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
1932 /* temporarily append the noauth_addrs list to addrs */
1933 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
1935 *plink = noauth_addrs;
1938 for (ap = addrs; ap != NULL; ap = ap->next) {
1939 /* "-" means no addresses authorized, "*" means any address allowed */
1940 ptr_word = ap->word;
1941 if (strcmp(ptr_word, "-") == 0)
1943 if (strcmp(ptr_word, "*") == 0) {
1945 ip[n].base = ip[n].mask = 0;
1951 if (*ptr_word == '!') {
1956 mask = ~ (u_int32_t) 0;
1958 ptr_mask = strchr (ptr_word, '/');
1959 if (ptr_mask != NULL) {
1963 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
1964 if (bit_count <= 0 || bit_count > 32) {
1965 warn("invalid address length %v in auth. address list",
1969 bit_count = 32 - bit_count; /* # bits in host part */
1971 offset = ifunit + 1;
1975 warn("invalid address length syntax: %v", ptr_mask+1);
1982 hp = gethostbyname(ptr_word);
1983 if (hp != NULL && hp->h_addrtype == AF_INET) {
1984 a = *(u_int32_t *)hp->h_addr;
1986 np = getnetbyname (ptr_word);
1987 if (np != NULL && np->n_addrtype == AF_INET) {
1988 a = htonl ((u_int32_t)np->n_net);
1989 if (ptr_mask == NULL) {
1990 /* calculate appropriate mask for net */
1993 mask = IN_CLASSA_NET;
1994 else if (IN_CLASSB(ah))
1995 mask = IN_CLASSB_NET;
1996 else if (IN_CLASSC(ah))
1997 mask = IN_CLASSC_NET;
2000 a = inet_addr (ptr_word);
2004 if (ptr_mask != NULL)
2007 if (a == (u_int32_t)-1L) {
2008 warn("unknown host %s in auth. address list", ap->word);
2012 if (offset >= ~mask) {
2013 warn("interface unit %d too large for subnet %v",
2017 a = htonl((ntohl(a) & mask) + offset);
2018 mask = ~(u_int32_t)0;
2020 ip[n].mask = htonl(mask);
2021 ip[n].base = a & ip[n].mask;
2023 if (~mask == 0 && suggested_ip == 0)
2028 ip[n].permit = 0; /* make the last entry forbid all addresses */
2029 ip[n].base = 0; /* to terminate the list */
2032 addresses[unit] = ip;
2035 * If the address given for the peer isn't authorized, or if
2036 * the user hasn't given one, AND there is an authorized address
2037 * which is a single host, then use that if we find one.
2039 if (suggested_ip != 0
2040 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2041 wo->hisaddr = suggested_ip;
2043 * Do we insist on this address? No, if there are other
2044 * addresses authorized than the suggested one.
2047 wo->accept_remote = 1;
2052 * auth_ip_addr - check whether the peer is authorized to use
2053 * a given IP address. Returns 1 if authorized, 0 otherwise.
2056 auth_ip_addr(int unit, u_int32_t addr)
2060 /* don't allow loopback or multicast address */
2061 if (bad_ip_adrs(addr))
2064 if (allowed_address_hook) {
2065 ok = allowed_address_hook(addr);
2066 if (ok >= 0) return ok;
2069 if (addresses[unit] != NULL) {
2070 ok = ip_addr_check(addr, addresses[unit]);
2076 return 0; /* no addresses authorized */
2077 return allow_any_ip || privileged || !have_route_to(addr);
2081 ip_addr_check(u_int32_t addr, struct permitted_ip *addrs)
2084 if ((addr & addrs->mask) == addrs->base)
2085 return addrs->permit;
2089 * bad_ip_adrs - return 1 if the IP address is one we don't want
2090 * to use, such as an address in the loopback net or a multicast address.
2091 * addr is in network byte order.
2094 bad_ip_adrs(u_int32_t addr)
2097 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2098 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2102 * some_ip_ok - check a wordlist to see if it authorizes any
2106 some_ip_ok(struct wordlist *addrs)
2108 for (; addrs != 0; addrs = addrs->next) {
2109 if (addrs->word[0] == '-')
2111 if (addrs->word[0] != '!')
2112 return 1; /* some IP address is allowed */
2118 * auth_number - check whether the remote number is allowed to connect.
2119 * Returns 1 if authorized, 0 otherwise.
2124 struct wordlist *wp = permitted_numbers;
2127 /* Allow all if no authorization list. */
2131 /* Allow if we have a match in the authorization list. */
2133 /* trailing '*' wildcard */
2134 l = strlen(wp->word);
2135 if ((wp->word)[l - 1] == '*')
2137 if (!strncasecmp(wp->word, remote_number, l))
2146 * check_access - complain if a secret file has too-liberal permissions.
2149 check_access(FILE *f, char *filename)
2153 if (fstat(fileno(f), &sbuf) < 0) {
2154 warn("cannot stat secret file %s: %m", filename);
2155 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2156 warn("Warning - secret file %s has world and/or group access",
2163 * scan_authfile - Scan an authorization file for a secret suitable
2164 * for authenticating `client' on `server'. The return value is -1
2165 * if no secret is found, otherwise >= 0. The return value has
2166 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2167 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2168 * Any following words on the line up to a "--" (i.e. address authorization
2169 * info) are placed in a wordlist and returned in *addrs. Any
2170 * following words (extra options) are placed in a wordlist and
2171 * returned in *opts.
2172 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2173 * Flags are non-zero if we need two colons in the secret in order to
2177 scan_authfile(FILE *f, char *client, char *server,
2178 char *secret, struct wordlist **addrs,
2179 struct wordlist **opts, char *filename,
2183 int got_flag, best_flag;
2185 struct wordlist *ap, *addr_list, *alist, **app;
2186 char word[MAXWORDLEN];
2187 char atfile[MAXWORDLEN];
2188 char lsecret[MAXWORDLEN];
2196 if (!getword(f, word, &newline, filename))
2197 return -1; /* file is empty??? */
2202 * Skip until we find a word at the start of a line.
2204 while (!newline && getword(f, word, &newline, filename))
2207 break; /* got to end of file */
2210 * Got a client - check if it's a match or a wildcard.
2213 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2218 got_flag = NONWILD_CLIENT;
2221 * Now get a server and check if it matches.
2223 if (!getword(f, word, &newline, filename))
2227 if (!ISWILD(word)) {
2228 if (server != NULL && strcmp(word, server) != 0)
2230 got_flag |= NONWILD_SERVER;
2234 * Got some sort of a match - see if it's better than what
2237 if (got_flag <= best_flag)
2243 if (!getword(f, word, &newline, filename))
2249 * SRP-SHA1 authenticator should never be reading secrets from
2250 * a file. (Authenticatee may, though.)
2252 if (flags && ((cp = strchr(word, ':')) == NULL ||
2253 strchr(cp + 1, ':') == NULL))
2256 if (secret != NULL) {
2258 * Special syntax: @/pathname means read secret from file.
2260 if (word[0] == '@' && word[1] == '/') {
2261 strlcpy(atfile, word+1, sizeof(atfile));
2262 if ((sf = fopen(atfile, "r")) == NULL) {
2263 warn("can't open indirect secret file %s", atfile);
2266 check_access(sf, atfile);
2267 if (!getword(sf, word, &xxx, atfile)) {
2268 warn("no secret in indirect secret file %s", atfile);
2274 strlcpy(lsecret, word, sizeof(lsecret));
2278 * Now read address authorization info and make a wordlist.
2282 if (!getword(f, word, &newline, filename) || newline)
2284 ap = (struct wordlist *)
2285 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2287 novm("authorized addresses");
2288 ap->word = (char *) (ap + 1);
2289 strcpy(ap->word, word);
2296 * This is the best so far; remember it.
2298 best_flag = got_flag;
2300 free_wordlist(addr_list);
2303 strlcpy(secret, lsecret, MAXWORDLEN);
2309 /* scan for a -- word indicating the start of options */
2310 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2311 if (strcmp(ap->word, "--") == 0)
2313 /* ap = start of options */
2315 ap = ap->next; /* first option */
2316 free(*app); /* free the "--" word */
2317 *app = NULL; /* terminate addr list */
2321 else if (ap != NULL)
2325 else if (addr_list != NULL)
2326 free_wordlist(addr_list);
2332 * wordlist_count - return the number of items in a wordlist
2335 wordlist_count(struct wordlist *wp)
2339 for (n = 0; wp != NULL; wp = wp->next)
2345 * free_wordlist - release memory allocated for a wordlist.
2348 free_wordlist(struct wordlist *wp)
2350 struct wordlist *next;
2352 while (wp != NULL) {
2360 * auth_script_done - called when the auth-up or auth-down script
2364 auth_script_done(void *arg)
2366 auth_script_pid = 0;
2367 switch (auth_script_state) {
2369 if (auth_state == s_down) {
2370 auth_script_state = s_down;
2371 auth_script(_PATH_AUTHDOWN);
2375 if (auth_state == s_up) {
2376 auth_script_state = s_up;
2377 auth_script(_PATH_AUTHUP);
2384 * auth_script - execute a script with arguments
2385 * interface-name peer-name real-user tty speed
2388 auth_script(char *script)
2396 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2397 user_name = pw->pw_name;
2399 slprintf(struid, sizeof(struid), "%d", getuid());
2402 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2406 argv[2] = peer_authname;
2407 argv[3] = user_name;
2413 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL, 0);
2419 have_eaptls_secret_server(char *client, char *server,
2420 int need_ip, int *lacks_ipp)
2425 struct wordlist *addrs;
2426 char servcertfile[MAXWORDLEN];
2427 char clicertfile[MAXWORDLEN];
2428 char cacertfile[MAXWORDLEN];
2429 char pkfile[MAXWORDLEN];
2431 filename = _PATH_EAPTLSSERVFILE;
2432 f = fopen(filename, "r");
2436 if (client != NULL && client[0] == 0)
2438 else if (server != NULL && server[0] == 0)
2442 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2443 cacertfile, pkfile, &addrs, NULL, filename,
2449 if (ret >= 0 && !eaptls_init_ssl(1, cacertfile, servcertfile,
2450 clicertfile, pkfile))
2454 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
2460 free_wordlist(addrs);
2467 have_eaptls_secret_client(char *client, char *server)
2472 struct wordlist *addrs = NULL;
2473 char servcertfile[MAXWORDLEN];
2474 char clicertfile[MAXWORDLEN];
2475 char cacertfile[MAXWORDLEN];
2476 char pkfile[MAXWORDLEN];
2478 if (client != NULL && client[0] == 0)
2480 else if (server != NULL && server[0] == 0)
2483 if ((cacert_file || ca_path) && cert_file && privkey_file)
2488 filename = _PATH_EAPTLSCLIFILE;
2489 f = fopen(filename, "r");
2494 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2495 cacertfile, pkfile, &addrs, NULL, filename,
2500 if (ret >= 0 && !eaptls_init_ssl(0, cacertfile, clicertfile,
2501 servcertfile, pkfile))
2506 free_wordlist(addrs);
2513 scan_authfile_eaptls(FILE *f, char *client, char *server,
2514 char *cli_cert, char *serv_cert, char *ca_cert,
2515 char *pk, struct wordlist **addrs,
2516 struct wordlist **opts,
2517 char *filename, int flags)
2520 int got_flag, best_flag;
2521 struct wordlist *ap, *addr_list, *alist, **app;
2522 char word[MAXWORDLEN];
2529 if (!getword(f, word, &newline, filename))
2530 return -1; /* file is empty??? */
2535 * Skip until we find a word at the start of a line.
2537 while (!newline && getword(f, word, &newline, filename));
2539 break; /* got to end of file */
2542 * Got a client - check if it's a match or a wildcard.
2545 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2550 got_flag = NONWILD_CLIENT;
2553 * Now get a server and check if it matches.
2555 if (!getword(f, word, &newline, filename))
2559 if (!ISWILD(word)) {
2560 if (server != NULL && strcmp(word, server) != 0)
2562 got_flag |= NONWILD_SERVER;
2566 * Got some sort of a match - see if it's better than what
2569 if (got_flag <= best_flag)
2575 if (!getword(f, word, &newline, filename))
2579 if (strcmp(word, "-") != 0) {
2580 strlcpy(cli_cert, word, MAXWORDLEN);
2587 if (!getword(f, word, &newline, filename))
2591 if (strcmp(word, "-") != 0) {
2592 strlcpy(serv_cert, word, MAXWORDLEN);
2599 if (!getword(f, word, &newline, filename))
2603 strlcpy(ca_cert, word, MAXWORDLEN);
2608 if (!getword(f, word, &newline, filename))
2612 strlcpy(pk, word, MAXWORDLEN);
2616 * Now read address authorization info and make a wordlist.
2620 if (!getword(f, word, &newline, filename) || newline)
2622 ap = (struct wordlist *)
2623 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2625 novm("authorized addresses");
2626 ap->word = (char *) (ap + 1);
2627 strcpy(ap->word, word);
2633 * This is the best so far; remember it.
2635 best_flag = got_flag;
2637 free_wordlist(addr_list);
2644 /* scan for a -- word indicating the start of options */
2645 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2646 if (strcmp(ap->word, "--") == 0)
2648 /* ap = start of options */
2650 ap = ap->next; /* first option */
2651 free(*app); /* free the "--" word */
2652 *app = NULL; /* terminate addr list */
2656 else if (ap != NULL)
2660 else if (addr_list != NULL)
2661 free_wordlist(addr_list);
2668 get_eaptls_secret(int unit, char *client, char *server,
2669 char *clicertfile, char *servcertfile, char *cacertfile,
2670 char *capath, char *pkfile, char *pkcs12, int am_server)
2674 char *filename = NULL;
2675 struct wordlist *addrs = NULL;
2676 struct wordlist *opts = NULL;
2678 /* maybe overkill, but it eases debugging */
2679 bzero(clicertfile, MAXWORDLEN);
2680 bzero(servcertfile, MAXWORDLEN);
2681 bzero(cacertfile, MAXWORDLEN);
2682 bzero(capath, MAXWORDLEN);
2683 bzero(pkfile, MAXWORDLEN);
2684 bzero(pkcs12, MAXWORDLEN);
2686 /* the ca+cert+privkey can also be specified as options */
2687 if (!am_server && (cacert_file || ca_path) && cert_file && privkey_file )
2689 strlcpy( clicertfile, cert_file, MAXWORDLEN );
2691 strlcpy( cacertfile, cacert_file, MAXWORDLEN );
2693 strlcpy( capath, ca_path, MAXWORDLEN );
2694 strlcpy( pkfile, privkey_file, MAXWORDLEN );
2696 else if (!am_server && pkcs12_file)
2698 strlcpy( pkcs12, pkcs12_file, MAXWORDLEN );
2700 strlcpy( cacertfile, cacert_file, MAXWORDLEN );
2702 strlcpy( capath, ca_path, MAXWORDLEN );
2706 filename = (am_server ? _PATH_EAPTLSSERVFILE : _PATH_EAPTLSCLIFILE);
2709 fp = fopen(filename, "r");
2712 error("Can't open eap-tls secret file %s: %m", filename);
2716 check_access(fp, filename);
2718 ret = scan_authfile_eaptls(fp, client, server, clicertfile, servcertfile,
2719 cacertfile, pkfile, &addrs, &opts, filename, 0);
2723 if (ret < 0) return 0;
2726 if (eaptls_passwd_hook)
2728 dbglog( "Calling eaptls password hook" );
2729 if ( (*eaptls_passwd_hook)(pkfile, passwd) < 0)
2731 error("Unable to obtain EAP-TLS password for %s (%s) from plugin",
2737 set_allowed_addrs(unit, addrs, opts);
2738 else if (opts != NULL)
2739 free_wordlist(opts);
2741 free_wordlist(addrs);