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 $"
82 #include <sys/types.h>
84 #include <sys/socket.h>
87 #if defined(_PATH_LASTLOG) && defined(__linux__)
92 #include <netinet/in.h>
93 #include <arpa/inet.h>
99 #define PW_PPP PW_LOGIN
105 #include <systemd/sd-daemon.h>
115 #include "chap-new.h"
123 #include "pathnames.h"
127 /* Bits in scan_authfile return value */
128 #define NONWILD_SERVER 1
129 #define NONWILD_CLIENT 2
131 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
133 /* The name by which the peer authenticated itself to us. */
134 char peer_authname[MAXNAMELEN];
136 /* Records which authentication operations haven't completed yet. */
137 static int auth_pending[NUM_PPP];
139 /* Records which authentication operations have been completed. */
140 int auth_done[NUM_PPP];
142 /* List of addresses which the peer may use. */
143 static struct permitted_ip *addresses[NUM_PPP];
145 /* Wordlist giving addresses which the peer may use
146 without authenticating itself. */
147 static struct wordlist *noauth_addrs;
149 /* Remote telephone number, if available */
150 char remote_number[MAXNAMELEN];
152 /* Wordlist giving remote telephone numbers which may connect. */
153 static struct wordlist *permitted_numbers;
155 /* Extra options to apply, from the secrets file entry for the peer. */
156 static struct wordlist *extra_options;
158 /* Number of network protocols which we have opened. */
159 static int num_np_open;
161 /* Number of network protocols which have come up. */
162 static int num_np_up;
164 /* Set if we got the contents of passwd[] from the pap-secrets file. */
165 static int passwd_from_file;
167 /* Set if we require authentication only because we have a default route. */
168 static bool default_auth;
170 /* Hook to enable a plugin to control the idle time limit */
171 int (*idle_time_hook)(struct ppp_idle *) = NULL;
173 /* Hook for a plugin to say whether we can possibly authenticate any peer */
174 int (*pap_check_hook)(void) = NULL;
176 /* Hook for a plugin to check the PAP user and password */
177 int (*pap_auth_hook)(char *user, char *passwd, char **msgp,
178 struct wordlist **paddrs,
179 struct wordlist **popts) = NULL;
181 /* Hook for a plugin to know about the PAP user logout */
182 void (*pap_logout_hook)(void) = NULL;
184 /* Hook for a plugin to get the PAP password for authenticating us */
185 int (*pap_passwd_hook)(char *user, char *passwd) = NULL;
187 /* Hook for a plugin to say if we can possibly authenticate a peer using CHAP */
188 int (*chap_check_hook)(void) = NULL;
190 /* Hook for a plugin to get the CHAP password for authenticating us */
191 int (*chap_passwd_hook)(char *user, char *passwd) = NULL;
194 /* Hook for a plugin to get the EAP-TLS password for authenticating us */
195 int (*eaptls_passwd_hook)(char *user, char *passwd) = NULL;
198 /* Hook for a plugin to say whether it is OK if the peer
199 refuses to authenticate. */
200 int (*null_auth_hook)(struct wordlist **paddrs,
201 struct wordlist **popts) = NULL;
203 int (*allowed_address_hook)(u_int32_t addr) = NULL;
205 #ifdef HAVE_MULTILINK
206 /* Hook for plugin to hear when an interface joins a multilink bundle */
207 void (*multilink_join_hook)(void) = NULL;
210 /* A notifier for when the peer has authenticated itself,
211 and we are proceeding to the network phase. */
212 struct notifier *auth_up_notifier = NULL;
214 /* A notifier for when the link goes down. */
215 struct notifier *link_down_notifier = NULL;
218 * This is used to ensure that we don't start an auth-up/down
219 * script while one is already running.
226 static enum script_state auth_state = s_down;
227 static enum script_state auth_script_state = s_down;
228 static pid_t auth_script_pid = 0;
233 bool uselogin = 0; /* Use /etc/passwd for checking PAP */
234 bool session_mgmt = 0; /* Do session management (login records) */
235 bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
236 bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
237 bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
238 bool refuse_eap = 0; /* Don't wanna auth. ourselves with EAP */
240 bool refuse_mschap = 0; /* Don't wanna auth. ourselves with MS-CHAP */
241 bool refuse_mschap_v2 = 0; /* Don't wanna auth. ourselves with MS-CHAPv2 */
243 bool refuse_mschap = 1; /* Don't wanna auth. ourselves with MS-CHAP */
244 bool refuse_mschap_v2 = 1; /* Don't wanna auth. ourselves with MS-CHAPv2 */
246 bool usehostname = 0; /* Use hostname for our_name */
247 bool auth_required = 0; /* Always require authentication from peer */
248 bool allow_any_ip = 0; /* Allow peer to use any IP address */
249 bool explicit_remote = 0; /* User specified explicit remote name */
250 bool explicit_user = 0; /* Set if "user" option supplied */
251 bool explicit_passwd = 0; /* Set if "password" option supplied */
252 char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
254 char *cacert_file = NULL; /* CA certificate file (pem format) */
255 char *ca_path = NULL; /* directory with CA certificates */
256 char *cert_file = NULL; /* client certificate file (pem format) */
257 char *privkey_file = NULL; /* client private key file (pem format) */
258 char *crl_dir = NULL; /* directory containing CRL files */
259 char *crl_file = NULL; /* Certificate Revocation List (CRL) file (pem format) */
260 char *max_tls_version = NULL; /* Maximum TLS protocol version (default=1.2) */
261 char *tls_verify_method = NULL;
262 bool tls_verify_key_usage = 0;
263 bool need_peer_eap = 0; /* Require peer to authenticate us */
266 static char *uafname; /* name of most recent +ua file */
268 extern char *crypt (const char *, const char *);
270 /* Prototypes for procedures local to this file. */
272 static void network_phase (int);
273 static void check_idle (void *);
274 static void connect_time_expired (void *);
275 static int null_login (int);
276 static int get_pap_passwd (char *);
277 static int have_pap_secret (int *);
278 static int have_chap_secret (char *, char *, int, int *);
279 static int have_srp_secret(char *client, char *server, int need_ip,
283 static int have_eaptls_secret_server
284 (char *client, char *server, int need_ip, int *lacks_ipp);
285 static int have_eaptls_secret_client (char *client, char *server);
286 static int scan_authfile_eaptls(FILE * f, char *client, char *server,
287 char *cli_cert, char *serv_cert,
288 char *ca_cert, char *pk,
289 struct wordlist ** addrs,
290 struct wordlist ** opts,
291 char *filename, int flags);
294 static int ip_addr_check (u_int32_t, struct permitted_ip *);
295 static int scan_authfile(FILE *, char *, char *, char *,
296 struct wordlist **, struct wordlist **,
298 static void free_wordlist (struct wordlist *);
299 static void auth_script (char *);
300 static void auth_script_done (void *);
301 static void set_allowed_addrs (int, struct wordlist *, struct wordlist *);
302 static int some_ip_ok (struct wordlist *);
303 static int setupapfile (char **);
304 static int privgroup (char **);
305 static int set_noauth_addr (char **);
306 static int set_permitted_number (char **);
307 static void check_access (FILE *, char *);
308 static int wordlist_count (struct wordlist *);
311 static void check_maxoctets (void *);
315 * Authentication-related options.
317 option_t auth_options[] = {
318 { "auth", o_bool, &auth_required,
319 "Require authentication from peer", OPT_PRIO | 1 },
320 { "noauth", o_bool, &auth_required,
321 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
323 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
324 "Require PAP authentication from peer",
325 OPT_PRIOSUB | 1, &auth_required },
326 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
327 "Require PAP authentication from peer",
328 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
329 { "require-chap", o_bool, &auth_required,
330 "Require CHAP authentication from peer",
331 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
332 &lcp_wantoptions[0].chap_mdtype },
333 { "+chap", o_bool, &auth_required,
334 "Require CHAP authentication from peer",
335 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
336 &lcp_wantoptions[0].chap_mdtype },
338 { "require-mschap", o_bool, &auth_required,
339 "Require MS-CHAP authentication from peer",
340 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
341 &lcp_wantoptions[0].chap_mdtype },
342 { "+mschap", o_bool, &auth_required,
343 "Require MS-CHAP authentication from peer",
344 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
345 &lcp_wantoptions[0].chap_mdtype },
346 { "require-mschap-v2", o_bool, &auth_required,
347 "Require MS-CHAPv2 authentication from peer",
348 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
349 &lcp_wantoptions[0].chap_mdtype },
350 { "+mschap-v2", o_bool, &auth_required,
351 "Require MS-CHAPv2 authentication from peer",
352 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
353 &lcp_wantoptions[0].chap_mdtype },
356 { "refuse-pap", o_bool, &refuse_pap,
357 "Don't agree to auth to peer with PAP", 1 },
358 { "-pap", o_bool, &refuse_pap,
359 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
360 { "refuse-chap", o_bool, &refuse_chap,
361 "Don't agree to auth to peer with CHAP",
362 OPT_A2CLRB | MDTYPE_MD5,
363 &lcp_allowoptions[0].chap_mdtype },
364 { "-chap", o_bool, &refuse_chap,
365 "Don't allow CHAP authentication with peer",
366 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
367 &lcp_allowoptions[0].chap_mdtype },
369 { "refuse-mschap", o_bool, &refuse_mschap,
370 "Don't agree to auth to peer with MS-CHAP",
371 OPT_A2CLRB | MDTYPE_MICROSOFT,
372 &lcp_allowoptions[0].chap_mdtype },
373 { "-mschap", o_bool, &refuse_mschap,
374 "Don't allow MS-CHAP authentication with peer",
375 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
376 &lcp_allowoptions[0].chap_mdtype },
377 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
378 "Don't agree to auth to peer with MS-CHAPv2",
379 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
380 &lcp_allowoptions[0].chap_mdtype },
381 { "-mschap-v2", o_bool, &refuse_mschap_v2,
382 "Don't allow MS-CHAPv2 authentication with peer",
383 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
384 &lcp_allowoptions[0].chap_mdtype },
387 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
388 "Require EAP authentication from peer", OPT_PRIOSUB | 1,
390 { "refuse-eap", o_bool, &refuse_eap,
391 "Don't agree to authenticate to peer with EAP", 1 },
393 { "name", o_string, our_name,
394 "Set local name for authentication",
395 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
397 { "+ua", o_special, (void *)setupapfile,
398 "Get PAP user and password from file",
399 OPT_PRIO | OPT_A2STRVAL, &uafname },
401 { "user", o_string, user,
402 "Set name for auth with peer", OPT_PRIO | OPT_STATIC,
403 &explicit_user, MAXNAMELEN },
405 { "password", o_string, passwd,
406 "Password for authenticating us to the peer",
407 OPT_PRIO | OPT_STATIC | OPT_HIDE,
408 &explicit_passwd, MAXSECRETLEN },
410 { "usehostname", o_bool, &usehostname,
411 "Must use hostname for authentication", 1 },
413 { "remotename", o_string, remote_name,
414 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
415 &explicit_remote, MAXNAMELEN },
417 { "login", o_bool, &uselogin,
418 "Use system password database for PAP", OPT_A2COPY | 1 ,
420 { "enable-session", o_bool, &session_mgmt,
421 "Enable session accounting for remote peers", OPT_PRIV | 1 },
423 { "papcrypt", o_bool, &cryptpap,
424 "PAP passwords are encrypted", 1 },
426 { "privgroup", o_special, (void *)privgroup,
427 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
429 { "allow-ip", o_special, (void *)set_noauth_addr,
430 "Set IP address(es) which can be used without authentication",
431 OPT_PRIV | OPT_A2LIST },
433 { "remotenumber", o_string, remote_number,
434 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
437 { "allow-number", o_special, (void *)set_permitted_number,
438 "Set telephone number(s) which are allowed to connect",
439 OPT_PRIV | OPT_A2LIST },
442 { "ca", o_string, &cacert_file, "EAP-TLS CA certificate in PEM format" },
443 { "capath", o_string, &ca_path, "EAP-TLS CA certificate directory" },
444 { "cert", o_string, &cert_file, "EAP-TLS client certificate in PEM format" },
445 { "key", o_string, &privkey_file, "EAP-TLS client private key in PEM format" },
446 { "crl-dir", o_string, &crl_dir, "Use CRLs in directory" },
447 { "crl", o_string, &crl_file, "Use specific CRL file" },
448 { "max-tls-version", o_string, &max_tls_version,
449 "Maximum TLS version (1.0/1.1/1.2 (default)/1.3)" },
450 { "tls-verify-key-usage", o_bool, &tls_verify_key_usage,
451 "Verify certificate type and extended key usage" },
452 { "tls-verify-method", o_string, &tls_verify_method,
453 "Verify peer by method (none|subject|name|suffix)" },
454 { "need-peer-eap", o_bool, &need_peer_eap,
455 "Require the peer to authenticate us", 1 },
456 #endif /* USE_EAPTLS */
461 * setupapfile - specifies UPAP info for authenticating with peer.
464 setupapfile(char **argv)
469 char u[MAXNAMELEN], p[MAXSECRETLEN];
472 lcp_allowoptions[0].neg_upap = 1;
474 /* open user info file */
475 fname = strdup(*argv);
477 novm("+ua file name");
479 if (seteuid(getuid()) == -1) {
480 option_error("unable to reset uid before opening %s: %m", fname);
484 ufile = fopen(fname, "r");
485 if (seteuid(euid) == -1)
486 fatal("unable to regain privileges: %m");
488 option_error("unable to open user login data file %s", fname);
492 check_access(ufile, fname);
496 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
497 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
499 option_error("unable to read user login data file %s", fname);
505 /* get rid of newlines */
507 if (l > 0 && u[l-1] == '\n')
510 if (l > 0 && p[l-1] == '\n')
513 if (override_value("user", option_priority, fname)) {
514 strlcpy(user, u, sizeof(user));
517 if (override_value("passwd", option_priority, fname)) {
518 strlcpy(passwd, p, sizeof(passwd));
528 * privgroup - allow members of the group to have privileged access.
531 privgroup(char **argv)
538 option_error("group %s is unknown", *argv);
541 for (i = 0; i < ngroups; ++i) {
542 if (groups[i] == g->gr_gid) {
552 * set_noauth_addr - set address(es) that can be used without authentication.
553 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
556 set_noauth_addr(char **argv)
559 int l = strlen(addr) + 1;
562 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
564 novm("allow-ip argument");
565 wp->word = (char *) (wp + 1);
566 wp->next = noauth_addrs;
567 BCOPY(addr, wp->word, l);
574 * set_permitted_number - set remote telephone number(s) that may connect.
577 set_permitted_number(char **argv)
579 char *number = *argv;
580 int l = strlen(number) + 1;
583 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
585 novm("allow-number argument");
586 wp->word = (char *) (wp + 1);
587 wp->next = permitted_numbers;
588 BCOPY(number, wp->word, l);
589 permitted_numbers = wp;
595 * An Open on LCP has requested a change from Dead to Establish phase.
598 link_required(int unit)
603 * Bring the link up to the point of being able to do ppp.
605 void start_link(int unit)
607 status = EXIT_CONNECT_FAILED;
608 new_phase(PHASE_SERIALCONN);
611 devfd = the_channel->connect();
615 /* set up the serial device as a ppp interface */
617 * N.B. we used to do tdb_writelock/tdb_writeunlock around this
618 * (from establish_ppp to set_ifunit). However, we won't be
619 * doing the set_ifunit in multilink mode, which is the only time
620 * we need the atomicity that the tdb_writelock/tdb_writeunlock
621 * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock.
623 fd_ppp = the_channel->establish_ppp(devfd);
625 status = EXIT_FATAL_ERROR;
629 if (!demand && ifunit >= 0)
633 * Start opening the connection and wait for
634 * incoming events (reply, timeout, etc.).
637 notice("Connect: %s <--> %s", ifname, ppp_devnam);
639 notice("Starting negotiation on %s", ppp_devnam);
642 status = EXIT_NEGOTIATION_FAILED;
643 new_phase(PHASE_ESTABLISH);
649 new_phase(PHASE_DISCONNECT);
650 if (the_channel->disconnect)
651 the_channel->disconnect();
654 new_phase(PHASE_DEAD);
655 if (the_channel->cleanup)
656 (*the_channel->cleanup)();
660 * LCP has terminated the link; go to the Dead phase and take the
661 * physical layer down.
664 link_terminated(int unit)
666 if (phase == PHASE_DEAD || phase == PHASE_MASTER)
668 new_phase(PHASE_DISCONNECT);
670 if (pap_logout_hook) {
675 if (!doing_multilink) {
676 notice("Connection terminated.");
679 notice("Link terminated.");
682 * Delete pid files before disestablishing ppp. Otherwise it
683 * can happen that another pppd gets the same unit and then
684 * we delete its pid file.
686 if (!doing_multilink && !demand)
690 * If we may want to bring the link up again, transfer
691 * the ppp unit back to the loopback. Set the
692 * real serial device back to its normal mode of operation.
697 the_channel->disestablish_ppp(devfd);
704 if (!doing_multilink && !demand)
705 script_unsetenv("IFNAME");
708 * Run disconnector script, if requested.
709 * XXX we may not be able to do this if the line has hung up!
711 if (devfd >= 0 && the_channel->disconnect) {
712 the_channel->disconnect();
715 if (the_channel->cleanup)
716 (*the_channel->cleanup)();
718 if (doing_multilink && multilink_master) {
719 if (!bundle_terminating) {
720 new_phase(PHASE_MASTER);
721 if (master_detach && !detached)
724 mp_bundle_terminated();
726 new_phase(PHASE_DEAD);
730 * LCP has gone down; it will either die or try to re-establish.
735 if (auth_state != s_down) {
736 notify(link_down_notifier, 0);
738 if (auth_script_state == s_up && auth_script_pid == 0) {
739 update_link_stats(unit);
740 auth_script_state = s_down;
741 auth_script(_PATH_AUTHDOWN);
744 if (!doing_multilink) {
745 upper_layers_down(unit);
746 if (phase != PHASE_DEAD && phase != PHASE_MASTER)
747 new_phase(PHASE_ESTABLISH);
749 /* XXX if doing_multilink, should do something to stop
750 network-layer traffic on the link */
753 void upper_layers_down(int unit)
756 struct protent *protp;
758 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
759 if (!protp->enabled_flag)
761 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
762 (*protp->lowerdown)(unit);
763 if (protp->protocol < 0xC000 && protp->close != NULL)
764 (*protp->close)(unit, "LCP down");
771 * The link is established.
772 * Proceed to the Dead, Authenticate or Network phase as appropriate.
775 link_established(int unit)
778 lcp_options *wo = &lcp_wantoptions[unit];
779 lcp_options *go = &lcp_gotoptions[unit];
780 lcp_options *ho = &lcp_hisoptions[unit];
782 lcp_options *ao = &lcp_allowoptions[unit];
785 struct protent *protp;
788 * Tell higher-level protocols that LCP is up.
790 if (!doing_multilink) {
791 for (i = 0; (protp = protocols[i]) != NULL; ++i)
792 if (protp->protocol != PPP_LCP && protp->enabled_flag
793 && protp->lowerup != NULL)
794 (*protp->lowerup)(unit);
797 if (!auth_required && noauth_addrs != NULL)
798 set_allowed_addrs(unit, NULL, NULL);
800 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) {
802 * We wanted the peer to authenticate itself, and it refused:
803 * if we have some address(es) it can use without auth, fine,
804 * otherwise treat it as though it authenticated with PAP using
805 * a username of "" and a password of "". If that's not OK,
808 if (noauth_addrs != NULL) {
809 set_allowed_addrs(unit, NULL, NULL);
810 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
811 warn("peer refused to authenticate: terminating link");
812 status = EXIT_PEER_AUTH_FAILED;
813 lcp_close(unit, "peer refused to authenticate");
819 if (need_peer_eap && !ao->neg_eap) {
820 warn("eap required to authenticate us but no suitable secrets");
821 lcp_close(unit, "couldn't negotiate eap");
822 status = EXIT_AUTH_TOPEER_FAILED;
826 if (need_peer_eap && !ho->neg_eap) {
827 warn("peer doesn't want to authenticate us with eap");
828 lcp_close(unit, "couldn't negotiate eap");
829 status = EXIT_PEER_AUTH_FAILED;
834 new_phase(PHASE_AUTHENTICATE);
837 eap_authpeer(unit, our_name);
839 } else if (go->neg_chap) {
840 chap_auth_peer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
842 } else if (go->neg_upap) {
847 eap_authwithpeer(unit, user);
848 auth |= EAP_WITHPEER;
849 } else if (ho->neg_chap) {
850 chap_auth_with_peer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
851 auth |= CHAP_WITHPEER;
852 } else if (ho->neg_upap) {
853 /* If a blank password was explicitly given as an option, trust
854 the user and don't try to look up one. */
855 if (passwd[0] == 0 && !explicit_passwd) {
856 passwd_from_file = 1;
857 if (!get_pap_passwd(passwd))
858 error("No secret found for PAP login");
860 upap_authwithpeer(unit, user, passwd);
861 auth |= PAP_WITHPEER;
863 auth_pending[unit] = auth;
871 * Proceed to the network phase.
874 network_phase(int unit)
876 lcp_options *go = &lcp_gotoptions[unit];
878 /* Log calling number. */
880 notice("peer from calling number %q authorized", remote_number);
883 * If the peer had to authenticate, run the auth-up script now.
885 notify(auth_up_notifier, 0);
886 if (go->neg_chap || go->neg_upap || go->neg_eap) {
888 if (auth_script_state == s_down && auth_script_pid == 0) {
889 auth_script_state = s_up;
890 auth_script(_PATH_AUTHUP);
896 * If we negotiated callback, do it now.
899 new_phase(PHASE_CALLBACK);
900 (*cbcp_protent.open)(unit);
906 * Process extra options from the secrets file
909 options_from_list(extra_options, 1);
910 free_wordlist(extra_options);
913 start_networks(unit);
917 start_networks(int unit)
920 struct protent *protp;
921 int ecp_required, mppe_required;
923 new_phase(PHASE_NETWORK);
925 #ifdef HAVE_MULTILINK
927 if (mp_join_bundle()) {
928 if (multilink_join_hook)
929 (*multilink_join_hook)();
930 if (updetach && !nodetach)
935 #endif /* HAVE_MULTILINK */
939 set_filters(&pass_filter, &active_filter);
941 /* Start CCP and ECP */
942 for (i = 0; (protp = protocols[i]) != NULL; ++i)
943 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
944 && protp->enabled_flag && protp->open != NULL)
948 * Bring up other network protocols iff encryption is not required.
950 ecp_required = ecp_gotoptions[unit].required;
951 mppe_required = ccp_gotoptions[unit].mppe;
952 if (!ecp_required && !mppe_required)
953 continue_networks(unit);
957 continue_networks(int unit)
960 struct protent *protp;
963 * Start the "real" network protocols.
965 for (i = 0; (protp = protocols[i]) != NULL; ++i)
966 if (protp->protocol < 0xC000
967 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
968 && protp->enabled_flag && protp->open != NULL) {
973 if (num_np_open == 0)
975 lcp_close(0, "No network protocols running");
979 * The peer has failed to authenticate himself using `protocol'.
982 auth_peer_fail(int unit, int protocol)
985 * Authentication failure: take the link down
987 status = EXIT_PEER_AUTH_FAILED;
988 lcp_close(unit, "Authentication failed");
992 * The peer has been successfully authenticated using `protocol'.
995 auth_peer_success(int unit, int protocol, int prot_flavor,
996 char *name, int namelen)
1003 switch (prot_flavor) {
1005 bit |= CHAP_MD5_PEER;
1008 case CHAP_MICROSOFT:
1009 bit |= CHAP_MS_PEER;
1011 case CHAP_MICROSOFT_V2:
1012 bit |= CHAP_MS2_PEER;
1024 warn("auth_peer_success: unknown protocol %x", protocol);
1029 * Save the authenticated name of the peer for later.
1031 if (namelen > sizeof(peer_authname) - 1)
1032 namelen = sizeof(peer_authname) - 1;
1033 BCOPY(name, peer_authname, namelen);
1034 peer_authname[namelen] = 0;
1035 script_setenv("PEERNAME", peer_authname, 0);
1037 /* Save the authentication method for later. */
1038 auth_done[unit] |= bit;
1041 * If there is no more authentication still to be done,
1042 * proceed to the network (or callback) phase.
1044 if ((auth_pending[unit] &= ~bit) == 0)
1045 network_phase(unit);
1049 * We have failed to authenticate ourselves to the peer using `protocol'.
1052 auth_withpeer_fail(int unit, int protocol)
1054 if (passwd_from_file)
1055 BZERO(passwd, MAXSECRETLEN);
1057 * We've failed to authenticate ourselves to our peer.
1058 * Some servers keep sending CHAP challenges, but there
1059 * is no point in persisting without any way to get updated
1060 * authentication secrets.
1062 status = EXIT_AUTH_TOPEER_FAILED;
1063 lcp_close(unit, "Failed to authenticate ourselves to peer");
1067 * We have successfully authenticated ourselves with the peer using `protocol'.
1070 auth_withpeer_success(int unit, int protocol, int prot_flavor)
1073 const char *prot = "";
1077 bit = CHAP_WITHPEER;
1079 switch (prot_flavor) {
1081 bit |= CHAP_MD5_WITHPEER;
1084 case CHAP_MICROSOFT:
1085 bit |= CHAP_MS_WITHPEER;
1087 case CHAP_MICROSOFT_V2:
1088 bit |= CHAP_MS2_WITHPEER;
1094 if (passwd_from_file)
1095 BZERO(passwd, MAXSECRETLEN);
1104 warn("auth_withpeer_success: unknown protocol %x", protocol);
1108 notice("%s authentication succeeded", prot);
1110 /* Save the authentication method for later. */
1111 auth_done[unit] |= bit;
1114 * If there is no more authentication still being done,
1115 * proceed to the network (or callback) phase.
1117 if ((auth_pending[unit] &= ~bit) == 0)
1118 network_phase(unit);
1123 * np_up - a network protocol has come up.
1126 np_up(int unit, int proto)
1130 if (num_np_up == 0) {
1132 * At this point we consider that the link has come up successfully.
1136 new_phase(PHASE_RUNNING);
1138 if (idle_time_hook != 0)
1139 tlim = (*idle_time_hook)(NULL);
1141 tlim = idle_time_limit;
1143 TIMEOUT(check_idle, NULL, tlim);
1146 * Set a timeout to close the connection once the maximum
1147 * connect time has expired.
1150 TIMEOUT(connect_time_expired, 0, maxconnect);
1154 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1158 * Detach now, if the updetach option was given.
1160 if (updetach && !nodetach) {
1161 dbglog("updetach is set. Now detaching.");
1164 } else if (nodetach && up_sdnotify) {
1165 dbglog("up_sdnotify is set. Now notifying systemd: READY=1");
1166 sd_notify(0, "READY=1");
1174 * np_down - a network protocol has gone down.
1177 np_down(int unit, int proto)
1179 if (--num_np_up == 0) {
1180 UNTIMEOUT(check_idle, NULL);
1181 UNTIMEOUT(connect_time_expired, NULL);
1183 UNTIMEOUT(check_maxoctets, NULL);
1185 new_phase(PHASE_NETWORK);
1190 * np_finished - a network protocol has finished using the link.
1193 np_finished(int unit, int proto)
1195 if (--num_np_open <= 0) {
1196 /* no further use for the link: shut up shop. */
1197 lcp_close(0, "No network protocols running");
1203 check_maxoctets(void *arg)
1207 update_link_stats(ifunit);
1210 switch(maxoctets_dir) {
1211 case PPP_OCTETS_DIRECTION_IN:
1212 used = link_stats.bytes_in;
1214 case PPP_OCTETS_DIRECTION_OUT:
1215 used = link_stats.bytes_out;
1217 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1218 case PPP_OCTETS_DIRECTION_MAXSESSION:
1219 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1222 used = link_stats.bytes_in+link_stats.bytes_out;
1225 if (used > maxoctets) {
1226 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1227 status = EXIT_TRAFFIC_LIMIT;
1228 lcp_close(0, "Traffic limit");
1231 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1237 * check_idle - check whether the link has been idle for long
1238 * enough that we can shut it down.
1241 check_idle(void *arg)
1243 struct ppp_idle idle;
1247 if (!get_idle_time(0, &idle))
1249 if (idle_time_hook != 0) {
1250 tlim = idle_time_hook(&idle);
1252 itime = MIN(idle.xmit_idle, idle.recv_idle);
1253 tlim = idle_time_limit - itime;
1256 /* link is idle: shut it down. */
1257 notice("Terminating connection due to lack of activity.");
1258 status = EXIT_IDLE_TIMEOUT;
1259 lcp_close(0, "Link inactive");
1262 TIMEOUT(check_idle, NULL, tlim);
1267 * connect_time_expired - log a message and close the connection.
1270 connect_time_expired(void *arg)
1272 info("Connect time expired");
1273 status = EXIT_CONNECT_TIME;
1274 lcp_close(0, "Connect time expired"); /* Close connection */
1278 * auth_check_options - called to check authentication options.
1281 auth_check_options(void)
1283 lcp_options *wo = &lcp_wantoptions[0];
1287 /* Default our_name to hostname, and user to our_name */
1288 if (our_name[0] == 0 || usehostname)
1289 strlcpy(our_name, hostname, sizeof(our_name));
1290 /* If a blank username was explicitly given as an option, trust
1291 the user and don't use our_name */
1292 if (user[0] == 0 && !explicit_user)
1293 strlcpy(user, our_name, sizeof(user));
1296 * If we have a default route, require the peer to authenticate
1297 * unless the noauth option was given or the real user is root.
1299 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1304 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1305 if (wo->chap_mdtype)
1308 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1309 if (auth_required) {
1311 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) {
1312 wo->neg_chap = chap_mdtype_all != MDTYPE_NONE;
1313 wo->chap_mdtype = chap_mdtype_all;
1319 wo->chap_mdtype = MDTYPE_NONE;
1325 * Check whether we have appropriate secrets to use
1326 * to authenticate the peer. Note that EAP can authenticate by way
1327 * of a CHAP-like exchanges as well as SRP.
1330 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1331 if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
1332 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1333 our_name, 1, &lacks_ip);
1335 if (!can_auth && wo->neg_eap) {
1336 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1337 our_name, 1, &lacks_ip);
1341 if (!can_auth && wo->neg_eap) {
1343 have_eaptls_secret_server((explicit_remote ? remote_name :
1344 NULL), our_name, 1, &lacks_ip);
1349 if (auth_required && !can_auth && noauth_addrs == NULL) {
1352 "By default the remote system is required to authenticate itself");
1354 "(because this system has a default route to the internet)");
1355 } else if (explicit_remote)
1357 "The remote system (%s) is required to authenticate itself",
1361 "The remote system is required to authenticate itself");
1363 "but I couldn't find any suitable secret (password) for it to use to do so.");
1366 "(None of the available passwords would let it use an IP address.)");
1372 * Early check for remote number authorization.
1374 if (!auth_number()) {
1375 warn("calling number %q is not authorized", remote_number);
1376 exit(EXIT_CNID_AUTH_FAILED);
1381 * auth_reset - called when LCP is starting negotiations to recheck
1382 * authentication options, i.e. whether we have appropriate secrets
1383 * to use for authenticating ourselves and/or the peer.
1386 auth_reset(int unit)
1388 lcp_options *go = &lcp_gotoptions[unit];
1389 lcp_options *ao = &lcp_allowoptions[unit];
1393 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1394 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1395 && ((passwd[0] != 0 || explicit_passwd) ||
1396 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1398 ao->neg_eap = !refuse_eap && (
1400 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1401 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1402 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL)
1404 || have_eaptls_secret_client(user, (explicit_remote? remote_name: NULL))
1409 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1412 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1413 our_name, 1, NULL)))
1417 (hadchap == 0 || (hadchap == -1 &&
1418 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1420 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1423 && !have_eaptls_secret_server((explicit_remote? remote_name: NULL),
1432 * check_passwd - Check the user name and passwd against the PAP secrets
1433 * file. If requested, also check against the system password database,
1434 * and login the user if OK.
1437 * UPAP_AUTHNAK: Authentication failed.
1438 * UPAP_AUTHACK: Authentication succeeded.
1439 * In either case, msg points to an appropriate message.
1442 check_passwd(int unit,
1443 char *auser, int userlen,
1444 char *apasswd, int passwdlen, char **msg)
1449 struct wordlist *addrs = NULL, *opts = NULL;
1450 char passwd[256], user[256];
1451 char secret[MAXWORDLEN];
1452 static int attempts = 0;
1455 * Make copies of apasswd and auser, then null-terminate them.
1456 * If there are unprintable characters in the password, make
1459 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1460 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1464 * Check if a plugin wants to handle this.
1466 if (pap_auth_hook) {
1467 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1469 /* note: set_allowed_addrs() saves opts (but not addrs):
1472 set_allowed_addrs(unit, addrs, opts);
1474 free_wordlist(opts);
1476 free_wordlist(addrs);
1477 BZERO(passwd, sizeof(passwd));
1478 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1483 * Open the file of pap secrets and scan for a suitable secret
1484 * for authenticating this user.
1486 filename = _PATH_UPAPFILE;
1487 addrs = opts = NULL;
1489 f = fopen(filename, "r");
1491 error("Can't open PAP password file %s: %m", filename);
1494 check_access(f, filename);
1495 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1496 warn("no PAP secret found for %s", user);
1499 * If the secret is "@login", it means to check
1500 * the password against the login database.
1502 int login_secret = strcmp(secret, "@login") == 0;
1504 if (uselogin || login_secret) {
1505 /* login option or secret is @login */
1506 if (session_full(user, passwd, devnam, msg) == 0) {
1509 } else if (session_mgmt) {
1510 if (session_check(user, NULL, devnam, NULL) == 0) {
1511 warn("Peer %q failed PAP Session verification", user);
1515 if (secret[0] != 0 && !login_secret) {
1516 /* password given in pap-secrets - must match */
1517 if (cryptpap || strcmp(passwd, secret) != 0) {
1518 char *cbuf = crypt(passwd, secret);
1519 if (!cbuf || strcmp(cbuf, secret) != 0)
1527 if (ret == UPAP_AUTHNAK) {
1529 *msg = "Login incorrect";
1531 * XXX can we ever get here more than once??
1532 * Frustrate passwd stealer programs.
1533 * Allow 10 tries, but start backing off after 3 (stolen from login).
1534 * On 10'th, drop the connection.
1536 if (attempts++ >= 10) {
1537 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1538 lcp_close(unit, "login failed");
1541 sleep((u_int) (attempts - 3) * 5);
1543 free_wordlist(opts);
1546 attempts = 0; /* Reset count */
1549 set_allowed_addrs(unit, addrs, opts);
1553 free_wordlist(addrs);
1554 BZERO(passwd, sizeof(passwd));
1555 BZERO(secret, sizeof(secret));
1561 * null_login - Check if a username of "" and a password of "" are
1562 * acceptable, and iff so, set the list of acceptable IP addresses
1566 null_login(int unit)
1571 struct wordlist *addrs, *opts;
1572 char secret[MAXWORDLEN];
1575 * Check if a plugin wants to handle this.
1579 ret = (*null_auth_hook)(&addrs, &opts);
1582 * Open the file of pap secrets and scan for a suitable secret.
1585 filename = _PATH_UPAPFILE;
1587 f = fopen(filename, "r");
1590 check_access(f, filename);
1592 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1593 ret = i >= 0 && secret[0] == 0;
1594 BZERO(secret, sizeof(secret));
1599 set_allowed_addrs(unit, addrs, opts);
1601 free_wordlist(opts);
1603 free_wordlist(addrs);
1610 * get_pap_passwd - get a password for authenticating ourselves with
1611 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1613 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1616 get_pap_passwd(char *passwd)
1621 char secret[MAXWORDLEN];
1624 * Check whether a plugin wants to supply this.
1626 if (pap_passwd_hook) {
1627 ret = (*pap_passwd_hook)(user, passwd);
1632 filename = _PATH_UPAPFILE;
1633 f = fopen(filename, "r");
1636 check_access(f, filename);
1637 ret = scan_authfile(f, user,
1638 (remote_name[0]? remote_name: NULL),
1639 secret, NULL, NULL, filename, 0);
1644 strlcpy(passwd, secret, MAXSECRETLEN);
1645 BZERO(secret, sizeof(secret));
1651 * have_pap_secret - check whether we have a PAP file with any
1652 * secrets that we could possibly use for authenticating the peer.
1655 have_pap_secret(int *lacks_ipp)
1660 struct wordlist *addrs;
1662 /* let the plugin decide, if there is one */
1663 if (pap_check_hook) {
1664 ret = (*pap_check_hook)();
1669 filename = _PATH_UPAPFILE;
1670 f = fopen(filename, "r");
1674 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1675 NULL, &addrs, NULL, filename, 0);
1677 if (ret >= 0 && !some_ip_ok(addrs)) {
1683 free_wordlist(addrs);
1690 * have_chap_secret - check whether we have a CHAP file with a
1691 * secret that we could possibly use for authenticating `client'
1692 * on `server'. Either can be the null string, meaning we don't
1693 * know the identity yet.
1696 have_chap_secret(char *client, char *server,
1697 int need_ip, int *lacks_ipp)
1702 struct wordlist *addrs;
1704 if (chap_check_hook) {
1705 ret = (*chap_check_hook)();
1711 filename = _PATH_CHAPFILE;
1712 f = fopen(filename, "r");
1716 if (client != NULL && client[0] == 0)
1718 else if (server != NULL && server[0] == 0)
1721 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1723 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1729 free_wordlist(addrs);
1736 * have_srp_secret - check whether we have a SRP file with a
1737 * secret that we could possibly use for authenticating `client'
1738 * on `server'. Either can be the null string, meaning we don't
1739 * know the identity yet.
1742 have_srp_secret(char *client, char *server, int need_ip, int *lacks_ipp)
1747 struct wordlist *addrs;
1749 filename = _PATH_SRPFILE;
1750 f = fopen(filename, "r");
1754 if (client != NULL && client[0] == 0)
1756 else if (server != NULL && server[0] == 0)
1759 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1761 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1767 free_wordlist(addrs);
1774 * get_secret - open the CHAP secret file and return the secret
1775 * for authenticating the given client on the given server.
1776 * (We could be either client or server).
1779 get_secret(int unit, char *client, char *server,
1780 char *secret, int *secret_len, int am_server)
1785 struct wordlist *addrs, *opts;
1786 char secbuf[MAXWORDLEN];
1788 if (!am_server && passwd[0] != 0) {
1789 strlcpy(secbuf, passwd, sizeof(secbuf));
1790 } else if (!am_server && chap_passwd_hook) {
1791 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1792 error("Unable to obtain CHAP password for %s on %s from plugin",
1797 filename = _PATH_CHAPFILE;
1801 f = fopen(filename, "r");
1803 error("Can't open chap secret file %s: %m", filename);
1806 check_access(f, filename);
1808 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1814 set_allowed_addrs(unit, addrs, opts);
1816 free_wordlist(opts);
1818 free_wordlist(addrs);
1821 len = strlen(secbuf);
1822 if (len > MAXSECRETLEN) {
1823 error("Secret for %s on %s is too long", client, server);
1826 BCOPY(secbuf, secret, len);
1827 BZERO(secbuf, sizeof(secbuf));
1835 * get_srp_secret - open the SRP secret file and return the secret
1836 * for authenticating the given client on the given server.
1837 * (We could be either client or server).
1840 get_srp_secret(int unit, char *client, char *server,
1841 char *secret, int am_server)
1846 struct wordlist *addrs, *opts;
1848 if (!am_server && passwd[0] != '\0') {
1849 strlcpy(secret, passwd, MAXWORDLEN);
1851 filename = _PATH_SRPFILE;
1854 fp = fopen(filename, "r");
1856 error("Can't open srp secret file %s: %m", filename);
1859 check_access(fp, filename);
1862 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
1863 filename, am_server);
1869 set_allowed_addrs(unit, addrs, opts);
1870 else if (opts != NULL)
1871 free_wordlist(opts);
1873 free_wordlist(addrs);
1880 * set_allowed_addrs() - set the list of allowed addresses.
1881 * Also looks for `--' indicating options to apply for this peer
1882 * and leaves the following words in extra_options.
1885 set_allowed_addrs(int unit, struct wordlist *addrs,
1886 struct wordlist *opts)
1889 struct wordlist *ap, **plink;
1890 struct permitted_ip *ip;
1891 char *ptr_word, *ptr_mask;
1894 u_int32_t a, mask, ah, offset;
1895 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1896 u_int32_t suggested_ip = 0;
1898 if (addresses[unit] != NULL)
1899 free(addresses[unit]);
1900 addresses[unit] = NULL;
1901 if (extra_options != NULL)
1902 free_wordlist(extra_options);
1903 extra_options = opts;
1906 * Count the number of IP addresses given.
1908 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
1911 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
1915 /* temporarily append the noauth_addrs list to addrs */
1916 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
1918 *plink = noauth_addrs;
1921 for (ap = addrs; ap != NULL; ap = ap->next) {
1922 /* "-" means no addresses authorized, "*" means any address allowed */
1923 ptr_word = ap->word;
1924 if (strcmp(ptr_word, "-") == 0)
1926 if (strcmp(ptr_word, "*") == 0) {
1928 ip[n].base = ip[n].mask = 0;
1934 if (*ptr_word == '!') {
1939 mask = ~ (u_int32_t) 0;
1941 ptr_mask = strchr (ptr_word, '/');
1942 if (ptr_mask != NULL) {
1946 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
1947 if (bit_count <= 0 || bit_count > 32) {
1948 warn("invalid address length %v in auth. address list",
1952 bit_count = 32 - bit_count; /* # bits in host part */
1954 offset = ifunit + 1;
1958 warn("invalid address length syntax: %v", ptr_mask+1);
1965 hp = gethostbyname(ptr_word);
1966 if (hp != NULL && hp->h_addrtype == AF_INET) {
1967 a = *(u_int32_t *)hp->h_addr;
1969 np = getnetbyname (ptr_word);
1970 if (np != NULL && np->n_addrtype == AF_INET) {
1971 a = htonl ((u_int32_t)np->n_net);
1972 if (ptr_mask == NULL) {
1973 /* calculate appropriate mask for net */
1976 mask = IN_CLASSA_NET;
1977 else if (IN_CLASSB(ah))
1978 mask = IN_CLASSB_NET;
1979 else if (IN_CLASSC(ah))
1980 mask = IN_CLASSC_NET;
1983 a = inet_addr (ptr_word);
1987 if (ptr_mask != NULL)
1990 if (a == (u_int32_t)-1L) {
1991 warn("unknown host %s in auth. address list", ap->word);
1995 if (offset >= ~mask) {
1996 warn("interface unit %d too large for subnet %v",
2000 a = htonl((ntohl(a) & mask) + offset);
2001 mask = ~(u_int32_t)0;
2003 ip[n].mask = htonl(mask);
2004 ip[n].base = a & ip[n].mask;
2006 if (~mask == 0 && suggested_ip == 0)
2011 ip[n].permit = 0; /* make the last entry forbid all addresses */
2012 ip[n].base = 0; /* to terminate the list */
2015 addresses[unit] = ip;
2018 * If the address given for the peer isn't authorized, or if
2019 * the user hasn't given one, AND there is an authorized address
2020 * which is a single host, then use that if we find one.
2022 if (suggested_ip != 0
2023 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2024 wo->hisaddr = suggested_ip;
2026 * Do we insist on this address? No, if there are other
2027 * addresses authorized than the suggested one.
2030 wo->accept_remote = 1;
2035 * auth_ip_addr - check whether the peer is authorized to use
2036 * a given IP address. Returns 1 if authorized, 0 otherwise.
2039 auth_ip_addr(int unit, u_int32_t addr)
2043 /* don't allow loopback or multicast address */
2044 if (bad_ip_adrs(addr))
2047 if (allowed_address_hook) {
2048 ok = allowed_address_hook(addr);
2049 if (ok >= 0) return ok;
2052 if (addresses[unit] != NULL) {
2053 ok = ip_addr_check(addr, addresses[unit]);
2059 return 0; /* no addresses authorized */
2060 return allow_any_ip || privileged || !have_route_to(addr);
2064 ip_addr_check(u_int32_t addr, struct permitted_ip *addrs)
2067 if ((addr & addrs->mask) == addrs->base)
2068 return addrs->permit;
2072 * bad_ip_adrs - return 1 if the IP address is one we don't want
2073 * to use, such as an address in the loopback net or a multicast address.
2074 * addr is in network byte order.
2077 bad_ip_adrs(u_int32_t addr)
2080 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2081 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2085 * some_ip_ok - check a wordlist to see if it authorizes any
2089 some_ip_ok(struct wordlist *addrs)
2091 for (; addrs != 0; addrs = addrs->next) {
2092 if (addrs->word[0] == '-')
2094 if (addrs->word[0] != '!')
2095 return 1; /* some IP address is allowed */
2101 * auth_number - check whether the remote number is allowed to connect.
2102 * Returns 1 if authorized, 0 otherwise.
2107 struct wordlist *wp = permitted_numbers;
2110 /* Allow all if no authorization list. */
2114 /* Allow if we have a match in the authorization list. */
2116 /* trailing '*' wildcard */
2117 l = strlen(wp->word);
2118 if ((wp->word)[l - 1] == '*')
2120 if (!strncasecmp(wp->word, remote_number, l))
2129 * check_access - complain if a secret file has too-liberal permissions.
2132 check_access(FILE *f, char *filename)
2136 if (fstat(fileno(f), &sbuf) < 0) {
2137 warn("cannot stat secret file %s: %m", filename);
2138 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2139 warn("Warning - secret file %s has world and/or group access",
2146 * scan_authfile - Scan an authorization file for a secret suitable
2147 * for authenticating `client' on `server'. The return value is -1
2148 * if no secret is found, otherwise >= 0. The return value has
2149 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2150 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2151 * Any following words on the line up to a "--" (i.e. address authorization
2152 * info) are placed in a wordlist and returned in *addrs. Any
2153 * following words (extra options) are placed in a wordlist and
2154 * returned in *opts.
2155 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2156 * Flags are non-zero if we need two colons in the secret in order to
2160 scan_authfile(FILE *f, char *client, char *server,
2161 char *secret, struct wordlist **addrs,
2162 struct wordlist **opts, char *filename,
2166 int got_flag, best_flag;
2168 struct wordlist *ap, *addr_list, *alist, **app;
2169 char word[MAXWORDLEN];
2170 char atfile[MAXWORDLEN];
2171 char lsecret[MAXWORDLEN];
2179 if (!getword(f, word, &newline, filename))
2180 return -1; /* file is empty??? */
2185 * Skip until we find a word at the start of a line.
2187 while (!newline && getword(f, word, &newline, filename))
2190 break; /* got to end of file */
2193 * Got a client - check if it's a match or a wildcard.
2196 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2201 got_flag = NONWILD_CLIENT;
2204 * Now get a server and check if it matches.
2206 if (!getword(f, word, &newline, filename))
2210 if (!ISWILD(word)) {
2211 if (server != NULL && strcmp(word, server) != 0)
2213 got_flag |= NONWILD_SERVER;
2217 * Got some sort of a match - see if it's better than what
2220 if (got_flag <= best_flag)
2226 if (!getword(f, word, &newline, filename))
2232 * SRP-SHA1 authenticator should never be reading secrets from
2233 * a file. (Authenticatee may, though.)
2235 if (flags && ((cp = strchr(word, ':')) == NULL ||
2236 strchr(cp + 1, ':') == NULL))
2239 if (secret != NULL) {
2241 * Special syntax: @/pathname means read secret from file.
2243 if (word[0] == '@' && word[1] == '/') {
2244 strlcpy(atfile, word+1, sizeof(atfile));
2245 if ((sf = fopen(atfile, "r")) == NULL) {
2246 warn("can't open indirect secret file %s", atfile);
2249 check_access(sf, atfile);
2250 if (!getword(sf, word, &xxx, atfile)) {
2251 warn("no secret in indirect secret file %s", atfile);
2257 strlcpy(lsecret, word, sizeof(lsecret));
2261 * Now read address authorization info and make a wordlist.
2265 if (!getword(f, word, &newline, filename) || newline)
2267 ap = (struct wordlist *)
2268 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2270 novm("authorized addresses");
2271 ap->word = (char *) (ap + 1);
2272 strcpy(ap->word, word);
2279 * This is the best so far; remember it.
2281 best_flag = got_flag;
2283 free_wordlist(addr_list);
2286 strlcpy(secret, lsecret, MAXWORDLEN);
2292 /* scan for a -- word indicating the start of options */
2293 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2294 if (strcmp(ap->word, "--") == 0)
2296 /* ap = start of options */
2298 ap = ap->next; /* first option */
2299 free(*app); /* free the "--" word */
2300 *app = NULL; /* terminate addr list */
2304 else if (ap != NULL)
2308 else if (addr_list != NULL)
2309 free_wordlist(addr_list);
2315 * wordlist_count - return the number of items in a wordlist
2318 wordlist_count(struct wordlist *wp)
2322 for (n = 0; wp != NULL; wp = wp->next)
2328 * free_wordlist - release memory allocated for a wordlist.
2331 free_wordlist(struct wordlist *wp)
2333 struct wordlist *next;
2335 while (wp != NULL) {
2343 * auth_script_done - called when the auth-up or auth-down script
2347 auth_script_done(void *arg)
2349 auth_script_pid = 0;
2350 switch (auth_script_state) {
2352 if (auth_state == s_down) {
2353 auth_script_state = s_down;
2354 auth_script(_PATH_AUTHDOWN);
2358 if (auth_state == s_up) {
2359 auth_script_state = s_up;
2360 auth_script(_PATH_AUTHUP);
2367 * auth_script - execute a script with arguments
2368 * interface-name peer-name real-user tty speed
2371 auth_script(char *script)
2379 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2380 user_name = pw->pw_name;
2382 slprintf(struid, sizeof(struid), "%d", getuid());
2385 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2389 argv[2] = peer_authname;
2390 argv[3] = user_name;
2395 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL, 0);
2401 have_eaptls_secret_server(char *client, char *server,
2402 int need_ip, int *lacks_ipp)
2407 struct wordlist *addrs;
2408 char servcertfile[MAXWORDLEN];
2409 char clicertfile[MAXWORDLEN];
2410 char cacertfile[MAXWORDLEN];
2411 char pkfile[MAXWORDLEN];
2413 filename = _PATH_EAPTLSSERVFILE;
2414 f = fopen(filename, "r");
2418 if (client != NULL && client[0] == 0)
2420 else if (server != NULL && server[0] == 0)
2424 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2425 cacertfile, pkfile, &addrs, NULL, filename,
2431 if (ret >= 0 && !eaptls_init_ssl(1, cacertfile, servcertfile,
2432 clicertfile, pkfile))
2436 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
2442 free_wordlist(addrs);
2449 have_eaptls_secret_client(char *client, char *server)
2454 struct wordlist *addrs = NULL;
2455 char servcertfile[MAXWORDLEN];
2456 char clicertfile[MAXWORDLEN];
2457 char cacertfile[MAXWORDLEN];
2458 char pkfile[MAXWORDLEN];
2460 if (client != NULL && client[0] == 0)
2462 else if (server != NULL && server[0] == 0)
2465 if ((cacert_file || ca_path) && cert_file && privkey_file)
2468 filename = _PATH_EAPTLSCLIFILE;
2469 f = fopen(filename, "r");
2474 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2475 cacertfile, pkfile, &addrs, NULL, filename,
2480 if (ret >= 0 && !eaptls_init_ssl(0, cacertfile, clicertfile,
2481 servcertfile, pkfile))
2486 free_wordlist(addrs);
2493 scan_authfile_eaptls(FILE *f, char *client, char *server,
2494 char *cli_cert, char *serv_cert, char *ca_cert,
2495 char *pk, struct wordlist **addrs,
2496 struct wordlist **opts,
2497 char *filename, int flags)
2500 int got_flag, best_flag;
2501 struct wordlist *ap, *addr_list, *alist, **app;
2502 char word[MAXWORDLEN];
2509 if (!getword(f, word, &newline, filename))
2510 return -1; /* file is empty??? */
2515 * Skip until we find a word at the start of a line.
2517 while (!newline && getword(f, word, &newline, filename));
2519 break; /* got to end of file */
2522 * Got a client - check if it's a match or a wildcard.
2525 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2530 got_flag = NONWILD_CLIENT;
2533 * Now get a server and check if it matches.
2535 if (!getword(f, word, &newline, filename))
2539 if (!ISWILD(word)) {
2540 if (server != NULL && strcmp(word, server) != 0)
2542 got_flag |= NONWILD_SERVER;
2546 * Got some sort of a match - see if it's better than what
2549 if (got_flag <= best_flag)
2555 if (!getword(f, word, &newline, filename))
2559 if (strcmp(word, "-") != 0) {
2560 strlcpy(cli_cert, word, MAXWORDLEN);
2567 if (!getword(f, word, &newline, filename))
2571 if (strcmp(word, "-") != 0) {
2572 strlcpy(serv_cert, word, MAXWORDLEN);
2579 if (!getword(f, word, &newline, filename))
2583 strlcpy(ca_cert, word, MAXWORDLEN);
2588 if (!getword(f, word, &newline, filename))
2592 strlcpy(pk, word, MAXWORDLEN);
2596 * Now read address authorization info and make a wordlist.
2600 if (!getword(f, word, &newline, filename) || newline)
2602 ap = (struct wordlist *)
2603 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2605 novm("authorized addresses");
2606 ap->word = (char *) (ap + 1);
2607 strcpy(ap->word, word);
2613 * This is the best so far; remember it.
2615 best_flag = got_flag;
2617 free_wordlist(addr_list);
2624 /* scan for a -- word indicating the start of options */
2625 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2626 if (strcmp(ap->word, "--") == 0)
2628 /* ap = start of options */
2630 ap = ap->next; /* first option */
2631 free(*app); /* free the "--" word */
2632 *app = NULL; /* terminate addr list */
2636 else if (ap != NULL)
2640 else if (addr_list != NULL)
2641 free_wordlist(addr_list);
2648 get_eaptls_secret(int unit, char *client, char *server,
2649 char *clicertfile, char *servcertfile, char *cacertfile,
2650 char *capath, char *pkfile, int am_server)
2654 char *filename = NULL;
2655 struct wordlist *addrs = NULL;
2656 struct wordlist *opts = NULL;
2658 /* maybe overkill, but it eases debugging */
2659 bzero(clicertfile, MAXWORDLEN);
2660 bzero(servcertfile, MAXWORDLEN);
2661 bzero(cacertfile, MAXWORDLEN);
2662 bzero(capath, MAXWORDLEN);
2663 bzero(pkfile, MAXWORDLEN);
2665 /* the ca+cert+privkey can also be specified as options */
2666 if (!am_server && (cacert_file || ca_path) && cert_file && privkey_file )
2668 strlcpy( clicertfile, cert_file, MAXWORDLEN );
2670 strlcpy( cacertfile, cacert_file, MAXWORDLEN );
2672 strlcpy( capath, ca_path, MAXWORDLEN );
2673 strlcpy( pkfile, privkey_file, MAXWORDLEN );
2677 filename = (am_server ? _PATH_EAPTLSSERVFILE : _PATH_EAPTLSCLIFILE);
2680 fp = fopen(filename, "r");
2683 error("Can't open eap-tls secret file %s: %m", filename);
2687 check_access(fp, filename);
2689 ret = scan_authfile_eaptls(fp, client, server, clicertfile, servcertfile,
2690 cacertfile, pkfile, &addrs, &opts, filename, 0);
2694 if (ret < 0) return 0;
2697 if (eaptls_passwd_hook)
2699 dbglog( "Calling eaptls password hook" );
2700 if ( (*eaptls_passwd_hook)(pkfile, passwd) < 0)
2702 error("Unable to obtain EAP-TLS password for %s (%s) from plugin",
2708 set_allowed_addrs(unit, addrs, opts);
2709 else if (opts != NULL)
2710 free_wordlist(opts);
2712 free_wordlist(addrs);