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 *pkcs12_file = NULL; /* client private key envelope file (pkcs12 format) */
259 char *crl_dir = NULL; /* directory containing CRL files */
260 char *crl_file = NULL; /* Certificate Revocation List (CRL) file (pem format) */
261 char *max_tls_version = NULL; /* Maximum TLS protocol version (default=1.2) */
262 char *tls_verify_method = NULL;
263 bool tls_verify_key_usage = 0;
264 bool need_peer_eap = 0; /* Require peer to authenticate us */
267 static char *uafname; /* name of most recent +ua file */
269 extern char *crypt (const char *, const char *);
271 /* Prototypes for procedures local to this file. */
273 static void network_phase (int);
274 static void check_idle (void *);
275 static void connect_time_expired (void *);
276 static int null_login (int);
277 static int get_pap_passwd (char *);
278 static int have_pap_secret (int *);
279 static int have_chap_secret (char *, char *, int, int *);
280 static int have_srp_secret(char *client, char *server, int need_ip,
284 static int have_eaptls_secret_server
285 (char *client, char *server, int need_ip, int *lacks_ipp);
286 static int have_eaptls_secret_client (char *client, char *server);
287 static int scan_authfile_eaptls(FILE * f, char *client, char *server,
288 char *cli_cert, char *serv_cert,
289 char *ca_cert, char *pk,
290 struct wordlist ** addrs,
291 struct wordlist ** opts,
292 char *filename, int flags);
295 static int ip_addr_check (u_int32_t, struct permitted_ip *);
296 static int scan_authfile(FILE *, char *, char *, char *,
297 struct wordlist **, struct wordlist **,
299 static void free_wordlist (struct wordlist *);
300 static void auth_script (char *);
301 static void auth_script_done (void *);
302 static void set_allowed_addrs (int, struct wordlist *, struct wordlist *);
303 static int some_ip_ok (struct wordlist *);
304 static int setupapfile (char **);
305 static int privgroup (char **);
306 static int set_noauth_addr (char **);
307 static int set_permitted_number (char **);
308 static void check_access (FILE *, char *);
309 static int wordlist_count (struct wordlist *);
312 static void check_maxoctets (void *);
316 * Authentication-related options.
318 option_t auth_options[] = {
319 { "auth", o_bool, &auth_required,
320 "Require authentication from peer", OPT_PRIO | 1 },
321 { "noauth", o_bool, &auth_required,
322 "Don't require peer to authenticate", OPT_PRIOSUB | OPT_PRIV,
324 { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
325 "Require PAP authentication from peer",
326 OPT_PRIOSUB | 1, &auth_required },
327 { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
328 "Require PAP authentication from peer",
329 OPT_ALIAS | OPT_PRIOSUB | 1, &auth_required },
330 { "require-chap", o_bool, &auth_required,
331 "Require CHAP authentication from peer",
332 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
333 &lcp_wantoptions[0].chap_mdtype },
334 { "+chap", o_bool, &auth_required,
335 "Require CHAP authentication from peer",
336 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MD5,
337 &lcp_wantoptions[0].chap_mdtype },
339 { "require-mschap", o_bool, &auth_required,
340 "Require MS-CHAP authentication from peer",
341 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
342 &lcp_wantoptions[0].chap_mdtype },
343 { "+mschap", o_bool, &auth_required,
344 "Require MS-CHAP authentication from peer",
345 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT,
346 &lcp_wantoptions[0].chap_mdtype },
347 { "require-mschap-v2", o_bool, &auth_required,
348 "Require MS-CHAPv2 authentication from peer",
349 OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
350 &lcp_wantoptions[0].chap_mdtype },
351 { "+mschap-v2", o_bool, &auth_required,
352 "Require MS-CHAPv2 authentication from peer",
353 OPT_ALIAS | OPT_PRIOSUB | OPT_A2OR | MDTYPE_MICROSOFT_V2,
354 &lcp_wantoptions[0].chap_mdtype },
357 { "refuse-pap", o_bool, &refuse_pap,
358 "Don't agree to auth to peer with PAP", 1 },
359 { "-pap", o_bool, &refuse_pap,
360 "Don't allow PAP authentication with peer", OPT_ALIAS | 1 },
361 { "refuse-chap", o_bool, &refuse_chap,
362 "Don't agree to auth to peer with CHAP",
363 OPT_A2CLRB | MDTYPE_MD5,
364 &lcp_allowoptions[0].chap_mdtype },
365 { "-chap", o_bool, &refuse_chap,
366 "Don't allow CHAP authentication with peer",
367 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MD5,
368 &lcp_allowoptions[0].chap_mdtype },
370 { "refuse-mschap", o_bool, &refuse_mschap,
371 "Don't agree to auth to peer with MS-CHAP",
372 OPT_A2CLRB | MDTYPE_MICROSOFT,
373 &lcp_allowoptions[0].chap_mdtype },
374 { "-mschap", o_bool, &refuse_mschap,
375 "Don't allow MS-CHAP authentication with peer",
376 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT,
377 &lcp_allowoptions[0].chap_mdtype },
378 { "refuse-mschap-v2", o_bool, &refuse_mschap_v2,
379 "Don't agree to auth to peer with MS-CHAPv2",
380 OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
381 &lcp_allowoptions[0].chap_mdtype },
382 { "-mschap-v2", o_bool, &refuse_mschap_v2,
383 "Don't allow MS-CHAPv2 authentication with peer",
384 OPT_ALIAS | OPT_A2CLRB | MDTYPE_MICROSOFT_V2,
385 &lcp_allowoptions[0].chap_mdtype },
388 { "require-eap", o_bool, &lcp_wantoptions[0].neg_eap,
389 "Require EAP authentication from peer", OPT_PRIOSUB | 1,
391 { "refuse-eap", o_bool, &refuse_eap,
392 "Don't agree to authenticate to peer with EAP", 1 },
394 { "name", o_string, our_name,
395 "Set local name for authentication",
396 OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXNAMELEN },
398 { "+ua", o_special, (void *)setupapfile,
399 "Get PAP user and password from file",
400 OPT_PRIO | OPT_A2STRVAL, &uafname },
402 { "user", o_string, user,
403 "Set name for auth with peer", OPT_PRIO | OPT_STATIC,
404 &explicit_user, MAXNAMELEN },
406 { "password", o_string, passwd,
407 "Password for authenticating us to the peer",
408 OPT_PRIO | OPT_STATIC | OPT_HIDE,
409 &explicit_passwd, MAXSECRETLEN },
411 { "usehostname", o_bool, &usehostname,
412 "Must use hostname for authentication", 1 },
414 { "remotename", o_string, remote_name,
415 "Set remote name for authentication", OPT_PRIO | OPT_STATIC,
416 &explicit_remote, MAXNAMELEN },
418 { "login", o_bool, &uselogin,
419 "Use system password database for PAP", OPT_A2COPY | 1 ,
421 { "enable-session", o_bool, &session_mgmt,
422 "Enable session accounting for remote peers", OPT_PRIV | 1 },
424 { "papcrypt", o_bool, &cryptpap,
425 "PAP passwords are encrypted", 1 },
427 { "privgroup", o_special, (void *)privgroup,
428 "Allow group members to use privileged options", OPT_PRIV | OPT_A2LIST },
430 { "allow-ip", o_special, (void *)set_noauth_addr,
431 "Set IP address(es) which can be used without authentication",
432 OPT_PRIV | OPT_A2LIST },
434 { "remotenumber", o_string, remote_number,
435 "Set remote telephone number for authentication", OPT_PRIO | OPT_STATIC,
438 { "allow-number", o_special, (void *)set_permitted_number,
439 "Set telephone number(s) which are allowed to connect",
440 OPT_PRIV | OPT_A2LIST },
443 { "ca", o_string, &cacert_file, "EAP-TLS CA certificate in PEM format" },
444 { "capath", o_string, &ca_path, "EAP-TLS CA certificate directory" },
445 { "cert", o_string, &cert_file, "EAP-TLS client certificate in PEM format" },
446 { "key", o_string, &privkey_file, "EAP-TLS client private key in PEM format" },
447 { "crl-dir", o_string, &crl_dir, "Use CRLs in directory" },
448 { "crl", o_string, &crl_file, "Use specific CRL file" },
449 { "pkcs12", o_string, &pkcs12_file, "EAP-TLS client credentials in PKCS12 format" },
450 { "max-tls-version", o_string, &max_tls_version,
451 "Maximum TLS version (1.0/1.1/1.2 (default)/1.3)" },
452 { "tls-verify-key-usage", o_bool, &tls_verify_key_usage,
453 "Verify certificate type and extended key usage" },
454 { "tls-verify-method", o_string, &tls_verify_method,
455 "Verify peer by method (none|subject|name|suffix)" },
456 { "need-peer-eap", o_bool, &need_peer_eap,
457 "Require the peer to authenticate us", 1 },
458 #endif /* USE_EAPTLS */
463 * setupapfile - specifies UPAP info for authenticating with peer.
466 setupapfile(char **argv)
471 char u[MAXNAMELEN], p[MAXSECRETLEN];
474 lcp_allowoptions[0].neg_upap = 1;
476 /* open user info file */
477 fname = strdup(*argv);
479 novm("+ua file name");
481 if (seteuid(getuid()) == -1) {
482 option_error("unable to reset uid before opening %s: %m", fname);
486 ufile = fopen(fname, "r");
487 if (seteuid(euid) == -1)
488 fatal("unable to regain privileges: %m");
490 option_error("unable to open user login data file %s", fname);
494 check_access(ufile, fname);
498 if (fgets(u, MAXNAMELEN - 1, ufile) == NULL
499 || fgets(p, MAXSECRETLEN - 1, ufile) == NULL) {
501 option_error("unable to read user login data file %s", fname);
507 /* get rid of newlines */
509 if (l > 0 && u[l-1] == '\n')
512 if (l > 0 && p[l-1] == '\n')
515 if (override_value("user", option_priority, fname)) {
516 strlcpy(user, u, sizeof(user));
519 if (override_value("passwd", option_priority, fname)) {
520 strlcpy(passwd, p, sizeof(passwd));
530 * privgroup - allow members of the group to have privileged access.
533 privgroup(char **argv)
540 option_error("group %s is unknown", *argv);
543 for (i = 0; i < ngroups; ++i) {
544 if (groups[i] == g->gr_gid) {
554 * set_noauth_addr - set address(es) that can be used without authentication.
555 * Equivalent to specifying an entry like `"" * "" addr' in pap-secrets.
558 set_noauth_addr(char **argv)
561 int l = strlen(addr) + 1;
564 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
566 novm("allow-ip argument");
567 wp->word = (char *) (wp + 1);
568 wp->next = noauth_addrs;
569 BCOPY(addr, wp->word, l);
576 * set_permitted_number - set remote telephone number(s) that may connect.
579 set_permitted_number(char **argv)
581 char *number = *argv;
582 int l = strlen(number) + 1;
585 wp = (struct wordlist *) malloc(sizeof(struct wordlist) + l);
587 novm("allow-number argument");
588 wp->word = (char *) (wp + 1);
589 wp->next = permitted_numbers;
590 BCOPY(number, wp->word, l);
591 permitted_numbers = wp;
597 * An Open on LCP has requested a change from Dead to Establish phase.
600 link_required(int unit)
605 * Bring the link up to the point of being able to do ppp.
607 void start_link(int unit)
609 status = EXIT_CONNECT_FAILED;
610 new_phase(PHASE_SERIALCONN);
613 devfd = the_channel->connect();
617 /* set up the serial device as a ppp interface */
619 * N.B. we used to do tdb_writelock/tdb_writeunlock around this
620 * (from establish_ppp to set_ifunit). However, we won't be
621 * doing the set_ifunit in multilink mode, which is the only time
622 * we need the atomicity that the tdb_writelock/tdb_writeunlock
623 * gives us. Thus we don't need the tdb_writelock/tdb_writeunlock.
625 fd_ppp = the_channel->establish_ppp(devfd);
627 status = EXIT_FATAL_ERROR;
631 if (!demand && ifunit >= 0)
635 * Start opening the connection and wait for
636 * incoming events (reply, timeout, etc.).
639 notice("Connect: %s <--> %s", ifname, ppp_devnam);
641 notice("Starting negotiation on %s", ppp_devnam);
644 status = EXIT_NEGOTIATION_FAILED;
645 new_phase(PHASE_ESTABLISH);
651 new_phase(PHASE_DISCONNECT);
652 if (the_channel->disconnect)
653 the_channel->disconnect();
656 new_phase(PHASE_DEAD);
657 if (the_channel->cleanup)
658 (*the_channel->cleanup)();
662 * LCP has terminated the link; go to the Dead phase and take the
663 * physical layer down.
666 link_terminated(int unit)
668 if (phase == PHASE_DEAD || phase == PHASE_MASTER)
670 new_phase(PHASE_DISCONNECT);
672 if (pap_logout_hook) {
677 if (!doing_multilink) {
678 notice("Connection terminated.");
681 notice("Link terminated.");
684 * Delete pid files before disestablishing ppp. Otherwise it
685 * can happen that another pppd gets the same unit and then
686 * we delete its pid file.
688 if (!doing_multilink && !demand)
692 * If we may want to bring the link up again, transfer
693 * the ppp unit back to the loopback. Set the
694 * real serial device back to its normal mode of operation.
699 the_channel->disestablish_ppp(devfd);
706 if (!doing_multilink && !demand)
707 script_unsetenv("IFNAME");
710 * Run disconnector script, if requested.
711 * XXX we may not be able to do this if the line has hung up!
713 if (devfd >= 0 && the_channel->disconnect) {
714 the_channel->disconnect();
717 if (the_channel->cleanup)
718 (*the_channel->cleanup)();
720 if (doing_multilink && multilink_master) {
721 if (!bundle_terminating) {
722 new_phase(PHASE_MASTER);
723 if (master_detach && !detached)
726 mp_bundle_terminated();
728 new_phase(PHASE_DEAD);
732 * LCP has gone down; it will either die or try to re-establish.
737 if (auth_state != s_down) {
738 notify(link_down_notifier, 0);
740 if (auth_script_state == s_up && auth_script_pid == 0) {
741 update_link_stats(unit);
742 auth_script_state = s_down;
743 auth_script(_PATH_AUTHDOWN);
746 if (!doing_multilink) {
747 upper_layers_down(unit);
748 if (phase != PHASE_DEAD && phase != PHASE_MASTER)
749 new_phase(PHASE_ESTABLISH);
751 /* XXX if doing_multilink, should do something to stop
752 network-layer traffic on the link */
755 void upper_layers_down(int unit)
758 struct protent *protp;
760 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
761 if (!protp->enabled_flag)
763 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
764 (*protp->lowerdown)(unit);
765 if (protp->protocol < 0xC000 && protp->close != NULL)
766 (*protp->close)(unit, "LCP down");
773 * The link is established.
774 * Proceed to the Dead, Authenticate or Network phase as appropriate.
777 link_established(int unit)
780 lcp_options *wo = &lcp_wantoptions[unit];
781 lcp_options *go = &lcp_gotoptions[unit];
782 lcp_options *ho = &lcp_hisoptions[unit];
784 lcp_options *ao = &lcp_allowoptions[unit];
787 struct protent *protp;
790 * Tell higher-level protocols that LCP is up.
792 if (!doing_multilink) {
793 for (i = 0; (protp = protocols[i]) != NULL; ++i)
794 if (protp->protocol != PPP_LCP && protp->enabled_flag
795 && protp->lowerup != NULL)
796 (*protp->lowerup)(unit);
799 if (!auth_required && noauth_addrs != NULL)
800 set_allowed_addrs(unit, NULL, NULL);
802 if (auth_required && !(go->neg_upap || go->neg_chap || go->neg_eap)) {
804 * We wanted the peer to authenticate itself, and it refused:
805 * if we have some address(es) it can use without auth, fine,
806 * otherwise treat it as though it authenticated with PAP using
807 * a username of "" and a password of "". If that's not OK,
810 if (noauth_addrs != NULL) {
811 set_allowed_addrs(unit, NULL, NULL);
812 } else if (!wo->neg_upap || uselogin || !null_login(unit)) {
813 warn("peer refused to authenticate: terminating link");
814 status = EXIT_PEER_AUTH_FAILED;
815 lcp_close(unit, "peer refused to authenticate");
821 if (need_peer_eap && !ao->neg_eap) {
822 warn("eap required to authenticate us but no suitable secrets");
823 lcp_close(unit, "couldn't negotiate eap");
824 status = EXIT_AUTH_TOPEER_FAILED;
828 if (need_peer_eap && !ho->neg_eap) {
829 warn("peer doesn't want to authenticate us with eap");
830 lcp_close(unit, "couldn't negotiate eap");
831 status = EXIT_PEER_AUTH_FAILED;
836 new_phase(PHASE_AUTHENTICATE);
839 eap_authpeer(unit, our_name);
841 } else if (go->neg_chap) {
842 chap_auth_peer(unit, our_name, CHAP_DIGEST(go->chap_mdtype));
844 } else if (go->neg_upap) {
849 eap_authwithpeer(unit, user);
850 auth |= EAP_WITHPEER;
851 } else if (ho->neg_chap) {
852 chap_auth_with_peer(unit, user, CHAP_DIGEST(ho->chap_mdtype));
853 auth |= CHAP_WITHPEER;
854 } else if (ho->neg_upap) {
855 /* If a blank password was explicitly given as an option, trust
856 the user and don't try to look up one. */
857 if (passwd[0] == 0 && !explicit_passwd) {
858 passwd_from_file = 1;
859 if (!get_pap_passwd(passwd))
860 error("No secret found for PAP login");
862 upap_authwithpeer(unit, user, passwd);
863 auth |= PAP_WITHPEER;
865 auth_pending[unit] = auth;
873 * Proceed to the network phase.
876 network_phase(int unit)
878 lcp_options *go = &lcp_gotoptions[unit];
880 /* Log calling number. */
882 notice("peer from calling number %q authorized", remote_number);
885 * If the peer had to authenticate, run the auth-up script now.
887 notify(auth_up_notifier, 0);
888 if (go->neg_chap || go->neg_upap || go->neg_eap) {
890 if (auth_script_state == s_down && auth_script_pid == 0) {
891 auth_script_state = s_up;
892 auth_script(_PATH_AUTHUP);
898 * If we negotiated callback, do it now.
901 new_phase(PHASE_CALLBACK);
902 (*cbcp_protent.open)(unit);
908 * Process extra options from the secrets file
911 options_from_list(extra_options, 1);
912 free_wordlist(extra_options);
915 start_networks(unit);
919 start_networks(int unit)
922 struct protent *protp;
923 int ecp_required, mppe_required;
925 new_phase(PHASE_NETWORK);
927 #ifdef HAVE_MULTILINK
929 if (mp_join_bundle()) {
930 if (multilink_join_hook)
931 (*multilink_join_hook)();
932 if (updetach && !nodetach)
937 #endif /* HAVE_MULTILINK */
941 set_filters(&pass_filter, &active_filter);
943 /* Start CCP and ECP */
944 for (i = 0; (protp = protocols[i]) != NULL; ++i)
945 if ((protp->protocol == PPP_ECP || protp->protocol == PPP_CCP)
946 && protp->enabled_flag && protp->open != NULL)
950 * Bring up other network protocols iff encryption is not required.
952 ecp_required = ecp_gotoptions[unit].required;
953 mppe_required = ccp_gotoptions[unit].mppe;
954 if (!ecp_required && !mppe_required)
955 continue_networks(unit);
959 continue_networks(int unit)
962 struct protent *protp;
965 * Start the "real" network protocols.
967 for (i = 0; (protp = protocols[i]) != NULL; ++i)
968 if (protp->protocol < 0xC000
969 && protp->protocol != PPP_CCP && protp->protocol != PPP_ECP
970 && protp->enabled_flag && protp->open != NULL) {
975 if (num_np_open == 0)
977 lcp_close(0, "No network protocols running");
981 * The peer has failed to authenticate himself using `protocol'.
984 auth_peer_fail(int unit, int protocol)
987 * Authentication failure: take the link down
989 status = EXIT_PEER_AUTH_FAILED;
990 lcp_close(unit, "Authentication failed");
994 * The peer has been successfully authenticated using `protocol'.
997 auth_peer_success(int unit, int protocol, int prot_flavor,
998 char *name, int namelen)
1005 switch (prot_flavor) {
1007 bit |= CHAP_MD5_PEER;
1010 case CHAP_MICROSOFT:
1011 bit |= CHAP_MS_PEER;
1013 case CHAP_MICROSOFT_V2:
1014 bit |= CHAP_MS2_PEER;
1026 warn("auth_peer_success: unknown protocol %x", protocol);
1031 * Save the authenticated name of the peer for later.
1033 if (namelen > sizeof(peer_authname) - 1)
1034 namelen = sizeof(peer_authname) - 1;
1035 BCOPY(name, peer_authname, namelen);
1036 peer_authname[namelen] = 0;
1037 script_setenv("PEERNAME", peer_authname, 0);
1039 /* Save the authentication method for later. */
1040 auth_done[unit] |= bit;
1043 * If there is no more authentication still to be done,
1044 * proceed to the network (or callback) phase.
1046 if ((auth_pending[unit] &= ~bit) == 0)
1047 network_phase(unit);
1051 * We have failed to authenticate ourselves to the peer using `protocol'.
1054 auth_withpeer_fail(int unit, int protocol)
1056 if (passwd_from_file)
1057 BZERO(passwd, MAXSECRETLEN);
1059 * We've failed to authenticate ourselves to our peer.
1060 * Some servers keep sending CHAP challenges, but there
1061 * is no point in persisting without any way to get updated
1062 * authentication secrets.
1064 status = EXIT_AUTH_TOPEER_FAILED;
1065 lcp_close(unit, "Failed to authenticate ourselves to peer");
1069 * We have successfully authenticated ourselves with the peer using `protocol'.
1072 auth_withpeer_success(int unit, int protocol, int prot_flavor)
1075 const char *prot = "";
1079 bit = CHAP_WITHPEER;
1081 switch (prot_flavor) {
1083 bit |= CHAP_MD5_WITHPEER;
1086 case CHAP_MICROSOFT:
1087 bit |= CHAP_MS_WITHPEER;
1089 case CHAP_MICROSOFT_V2:
1090 bit |= CHAP_MS2_WITHPEER;
1096 if (passwd_from_file)
1097 BZERO(passwd, MAXSECRETLEN);
1106 warn("auth_withpeer_success: unknown protocol %x", protocol);
1110 notice("%s authentication succeeded", prot);
1112 /* Save the authentication method for later. */
1113 auth_done[unit] |= bit;
1116 * If there is no more authentication still being done,
1117 * proceed to the network (or callback) phase.
1119 if ((auth_pending[unit] &= ~bit) == 0)
1120 network_phase(unit);
1125 * np_up - a network protocol has come up.
1128 np_up(int unit, int proto)
1132 if (num_np_up == 0) {
1134 * At this point we consider that the link has come up successfully.
1138 new_phase(PHASE_RUNNING);
1140 if (idle_time_hook != 0)
1141 tlim = (*idle_time_hook)(NULL);
1143 tlim = idle_time_limit;
1145 TIMEOUT(check_idle, NULL, tlim);
1148 * Set a timeout to close the connection once the maximum
1149 * connect time has expired.
1152 TIMEOUT(connect_time_expired, 0, maxconnect);
1156 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1160 * Detach now, if the updetach option was given.
1162 if (updetach && !nodetach) {
1163 dbglog("updetach is set. Now detaching.");
1166 } else if (nodetach && up_sdnotify) {
1167 dbglog("up_sdnotify is set. Now notifying systemd: READY=1");
1168 sd_notify(0, "READY=1");
1176 * np_down - a network protocol has gone down.
1179 np_down(int unit, int proto)
1181 if (--num_np_up == 0) {
1182 UNTIMEOUT(check_idle, NULL);
1183 UNTIMEOUT(connect_time_expired, NULL);
1185 UNTIMEOUT(check_maxoctets, NULL);
1187 new_phase(PHASE_NETWORK);
1192 * np_finished - a network protocol has finished using the link.
1195 np_finished(int unit, int proto)
1197 if (--num_np_open <= 0) {
1198 /* no further use for the link: shut up shop. */
1199 lcp_close(0, "No network protocols running");
1205 check_maxoctets(void *arg)
1209 update_link_stats(ifunit);
1212 switch(maxoctets_dir) {
1213 case PPP_OCTETS_DIRECTION_IN:
1214 used = link_stats.bytes_in;
1216 case PPP_OCTETS_DIRECTION_OUT:
1217 used = link_stats.bytes_out;
1219 case PPP_OCTETS_DIRECTION_MAXOVERAL:
1220 case PPP_OCTETS_DIRECTION_MAXSESSION:
1221 used = (link_stats.bytes_in > link_stats.bytes_out) ? link_stats.bytes_in : link_stats.bytes_out;
1224 used = link_stats.bytes_in+link_stats.bytes_out;
1227 if (used > maxoctets) {
1228 notice("Traffic limit reached. Limit: %u Used: %u", maxoctets, used);
1229 status = EXIT_TRAFFIC_LIMIT;
1230 lcp_close(0, "Traffic limit");
1233 TIMEOUT(check_maxoctets, NULL, maxoctets_timeout);
1239 * check_idle - check whether the link has been idle for long
1240 * enough that we can shut it down.
1243 check_idle(void *arg)
1245 struct ppp_idle idle;
1249 if (!get_idle_time(0, &idle))
1251 if (idle_time_hook != 0) {
1252 tlim = idle_time_hook(&idle);
1254 itime = MIN(idle.xmit_idle, idle.recv_idle);
1255 tlim = idle_time_limit - itime;
1258 /* link is idle: shut it down. */
1259 notice("Terminating connection due to lack of activity.");
1260 status = EXIT_IDLE_TIMEOUT;
1261 lcp_close(0, "Link inactive");
1264 TIMEOUT(check_idle, NULL, tlim);
1269 * connect_time_expired - log a message and close the connection.
1272 connect_time_expired(void *arg)
1274 info("Connect time expired");
1275 status = EXIT_CONNECT_TIME;
1276 lcp_close(0, "Connect time expired"); /* Close connection */
1280 * auth_check_options - called to check authentication options.
1283 auth_check_options(void)
1285 lcp_options *wo = &lcp_wantoptions[0];
1289 /* Default our_name to hostname, and user to our_name */
1290 if (our_name[0] == 0 || usehostname)
1291 strlcpy(our_name, hostname, sizeof(our_name));
1292 /* If a blank username was explicitly given as an option, trust
1293 the user and don't use our_name */
1294 if (user[0] == 0 && !explicit_user)
1295 strlcpy(user, our_name, sizeof(user));
1298 * If we have a default route, require the peer to authenticate
1299 * unless the noauth option was given or the real user is root.
1301 if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
1306 /* If we selected any CHAP flavors, we should probably negotiate it. :-) */
1307 if (wo->chap_mdtype)
1310 /* If authentication is required, ask peer for CHAP, PAP, or EAP. */
1311 if (auth_required) {
1313 if (!wo->neg_chap && !wo->neg_upap && !wo->neg_eap) {
1314 wo->neg_chap = chap_mdtype_all != MDTYPE_NONE;
1315 wo->chap_mdtype = chap_mdtype_all;
1321 wo->chap_mdtype = MDTYPE_NONE;
1327 * Check whether we have appropriate secrets to use
1328 * to authenticate the peer. Note that EAP can authenticate by way
1329 * of a CHAP-like exchanges as well as SRP.
1332 can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
1333 if (!can_auth && (wo->neg_chap || wo->neg_eap)) {
1334 can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
1335 our_name, 1, &lacks_ip);
1337 if (!can_auth && wo->neg_eap) {
1338 can_auth = have_srp_secret((explicit_remote? remote_name: NULL),
1339 our_name, 1, &lacks_ip);
1343 if (!can_auth && wo->neg_eap) {
1345 have_eaptls_secret_server((explicit_remote ? remote_name :
1346 NULL), our_name, 1, &lacks_ip);
1351 if (auth_required && !can_auth && noauth_addrs == NULL) {
1354 "By default the remote system is required to authenticate itself");
1356 "(because this system has a default route to the internet)");
1357 } else if (explicit_remote)
1359 "The remote system (%s) is required to authenticate itself",
1363 "The remote system is required to authenticate itself");
1365 "but I couldn't find any suitable secret (password) for it to use to do so.");
1368 "(None of the available passwords would let it use an IP address.)");
1374 * Early check for remote number authorization.
1376 if (!auth_number()) {
1377 warn("calling number %q is not authorized", remote_number);
1378 exit(EXIT_CNID_AUTH_FAILED);
1383 * auth_reset - called when LCP is starting negotiations to recheck
1384 * authentication options, i.e. whether we have appropriate secrets
1385 * to use for authenticating ourselves and/or the peer.
1388 auth_reset(int unit)
1390 lcp_options *go = &lcp_gotoptions[unit];
1391 lcp_options *ao = &lcp_allowoptions[unit];
1395 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
1396 ao->neg_chap = (!refuse_chap || !refuse_mschap || !refuse_mschap_v2)
1397 && ((passwd[0] != 0 || explicit_passwd) ||
1398 (hadchap = have_chap_secret(user, (explicit_remote? remote_name:
1400 ao->neg_eap = !refuse_eap && (
1402 (hadchap == 1 || (hadchap == -1 && have_chap_secret(user,
1403 (explicit_remote? remote_name: NULL), 0, NULL))) ||
1404 have_srp_secret(user, (explicit_remote? remote_name: NULL), 0, NULL)
1406 || have_eaptls_secret_client(user, (explicit_remote? remote_name: NULL))
1411 if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
1414 if (!(hadchap = have_chap_secret((explicit_remote? remote_name: NULL),
1415 our_name, 1, NULL)))
1419 (hadchap == 0 || (hadchap == -1 &&
1420 !have_chap_secret((explicit_remote? remote_name: NULL), our_name,
1422 !have_srp_secret((explicit_remote? remote_name: NULL), our_name, 1,
1425 && !have_eaptls_secret_server((explicit_remote? remote_name: NULL),
1434 * check_passwd - Check the user name and passwd against the PAP secrets
1435 * file. If requested, also check against the system password database,
1436 * and login the user if OK.
1439 * UPAP_AUTHNAK: Authentication failed.
1440 * UPAP_AUTHACK: Authentication succeeded.
1441 * In either case, msg points to an appropriate message.
1444 check_passwd(int unit,
1445 char *auser, int userlen,
1446 char *apasswd, int passwdlen, char **msg)
1451 struct wordlist *addrs = NULL, *opts = NULL;
1452 char passwd[256], user[256];
1453 char secret[MAXWORDLEN];
1454 static int attempts = 0;
1457 * Make copies of apasswd and auser, then null-terminate them.
1458 * If there are unprintable characters in the password, make
1461 slprintf(passwd, sizeof(passwd), "%.*v", passwdlen, apasswd);
1462 slprintf(user, sizeof(user), "%.*v", userlen, auser);
1466 * Check if a plugin wants to handle this.
1468 if (pap_auth_hook) {
1469 ret = (*pap_auth_hook)(user, passwd, msg, &addrs, &opts);
1471 /* note: set_allowed_addrs() saves opts (but not addrs):
1474 set_allowed_addrs(unit, addrs, opts);
1476 free_wordlist(opts);
1478 free_wordlist(addrs);
1479 BZERO(passwd, sizeof(passwd));
1480 return ret? UPAP_AUTHACK: UPAP_AUTHNAK;
1485 * Open the file of pap secrets and scan for a suitable secret
1486 * for authenticating this user.
1488 filename = _PATH_UPAPFILE;
1489 addrs = opts = NULL;
1491 f = fopen(filename, "r");
1493 error("Can't open PAP password file %s: %m", filename);
1496 check_access(f, filename);
1497 if (scan_authfile(f, user, our_name, secret, &addrs, &opts, filename, 0) < 0) {
1498 warn("no PAP secret found for %s", user);
1501 * If the secret is "@login", it means to check
1502 * the password against the login database.
1504 int login_secret = strcmp(secret, "@login") == 0;
1506 if (uselogin || login_secret) {
1507 /* login option or secret is @login */
1508 if (session_full(user, passwd, devnam, msg) == 0) {
1511 } else if (session_mgmt) {
1512 if (session_check(user, NULL, devnam, NULL) == 0) {
1513 warn("Peer %q failed PAP Session verification", user);
1517 if (secret[0] != 0 && !login_secret) {
1518 /* password given in pap-secrets - must match */
1519 if (cryptpap || strcmp(passwd, secret) != 0) {
1520 char *cbuf = crypt(passwd, secret);
1521 if (!cbuf || strcmp(cbuf, secret) != 0)
1529 if (ret == UPAP_AUTHNAK) {
1531 *msg = "Login incorrect";
1533 * XXX can we ever get here more than once??
1534 * Frustrate passwd stealer programs.
1535 * Allow 10 tries, but start backing off after 3 (stolen from login).
1536 * On 10'th, drop the connection.
1538 if (attempts++ >= 10) {
1539 warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
1540 lcp_close(unit, "login failed");
1543 sleep((u_int) (attempts - 3) * 5);
1545 free_wordlist(opts);
1548 attempts = 0; /* Reset count */
1551 set_allowed_addrs(unit, addrs, opts);
1555 free_wordlist(addrs);
1556 BZERO(passwd, sizeof(passwd));
1557 BZERO(secret, sizeof(secret));
1563 * null_login - Check if a username of "" and a password of "" are
1564 * acceptable, and iff so, set the list of acceptable IP addresses
1568 null_login(int unit)
1573 struct wordlist *addrs, *opts;
1574 char secret[MAXWORDLEN];
1577 * Check if a plugin wants to handle this.
1581 ret = (*null_auth_hook)(&addrs, &opts);
1584 * Open the file of pap secrets and scan for a suitable secret.
1587 filename = _PATH_UPAPFILE;
1589 f = fopen(filename, "r");
1592 check_access(f, filename);
1594 i = scan_authfile(f, "", our_name, secret, &addrs, &opts, filename, 0);
1595 ret = i >= 0 && secret[0] == 0;
1596 BZERO(secret, sizeof(secret));
1601 set_allowed_addrs(unit, addrs, opts);
1603 free_wordlist(opts);
1605 free_wordlist(addrs);
1612 * get_pap_passwd - get a password for authenticating ourselves with
1613 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1615 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
1618 get_pap_passwd(char *passwd)
1623 char secret[MAXWORDLEN];
1626 * Check whether a plugin wants to supply this.
1628 if (pap_passwd_hook) {
1629 ret = (*pap_passwd_hook)(user, passwd);
1634 filename = _PATH_UPAPFILE;
1635 f = fopen(filename, "r");
1638 check_access(f, filename);
1639 ret = scan_authfile(f, user,
1640 (remote_name[0]? remote_name: NULL),
1641 secret, NULL, NULL, filename, 0);
1646 strlcpy(passwd, secret, MAXSECRETLEN);
1647 BZERO(secret, sizeof(secret));
1653 * have_pap_secret - check whether we have a PAP file with any
1654 * secrets that we could possibly use for authenticating the peer.
1657 have_pap_secret(int *lacks_ipp)
1662 struct wordlist *addrs;
1664 /* let the plugin decide, if there is one */
1665 if (pap_check_hook) {
1666 ret = (*pap_check_hook)();
1671 filename = _PATH_UPAPFILE;
1672 f = fopen(filename, "r");
1676 ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
1677 NULL, &addrs, NULL, filename, 0);
1679 if (ret >= 0 && !some_ip_ok(addrs)) {
1685 free_wordlist(addrs);
1692 * have_chap_secret - check whether we have a CHAP file with a
1693 * secret that we could possibly use for authenticating `client'
1694 * on `server'. Either can be the null string, meaning we don't
1695 * know the identity yet.
1698 have_chap_secret(char *client, char *server,
1699 int need_ip, int *lacks_ipp)
1704 struct wordlist *addrs;
1706 if (chap_check_hook) {
1707 ret = (*chap_check_hook)();
1713 filename = _PATH_CHAPFILE;
1714 f = fopen(filename, "r");
1718 if (client != NULL && client[0] == 0)
1720 else if (server != NULL && server[0] == 0)
1723 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1725 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1731 free_wordlist(addrs);
1738 * have_srp_secret - check whether we have a SRP file with a
1739 * secret that we could possibly use for authenticating `client'
1740 * on `server'. Either can be the null string, meaning we don't
1741 * know the identity yet.
1744 have_srp_secret(char *client, char *server, int need_ip, int *lacks_ipp)
1749 struct wordlist *addrs;
1751 filename = _PATH_SRPFILE;
1752 f = fopen(filename, "r");
1756 if (client != NULL && client[0] == 0)
1758 else if (server != NULL && server[0] == 0)
1761 ret = scan_authfile(f, client, server, NULL, &addrs, NULL, filename, 0);
1763 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
1769 free_wordlist(addrs);
1776 * get_secret - open the CHAP secret file and return the secret
1777 * for authenticating the given client on the given server.
1778 * (We could be either client or server).
1781 get_secret(int unit, char *client, char *server,
1782 char *secret, int *secret_len, int am_server)
1787 struct wordlist *addrs, *opts;
1788 char secbuf[MAXWORDLEN];
1790 if (!am_server && passwd[0] != 0) {
1791 strlcpy(secbuf, passwd, sizeof(secbuf));
1792 } else if (!am_server && chap_passwd_hook) {
1793 if ( (*chap_passwd_hook)(client, secbuf) < 0) {
1794 error("Unable to obtain CHAP password for %s on %s from plugin",
1799 filename = _PATH_CHAPFILE;
1803 f = fopen(filename, "r");
1805 error("Can't open chap secret file %s: %m", filename);
1808 check_access(f, filename);
1810 ret = scan_authfile(f, client, server, secbuf, &addrs, &opts, filename, 0);
1816 set_allowed_addrs(unit, addrs, opts);
1818 free_wordlist(opts);
1820 free_wordlist(addrs);
1823 len = strlen(secbuf);
1824 if (len > MAXSECRETLEN) {
1825 error("Secret for %s on %s is too long", client, server);
1828 BCOPY(secbuf, secret, len);
1829 BZERO(secbuf, sizeof(secbuf));
1837 * get_srp_secret - open the SRP secret file and return the secret
1838 * for authenticating the given client on the given server.
1839 * (We could be either client or server).
1842 get_srp_secret(int unit, char *client, char *server,
1843 char *secret, int am_server)
1848 struct wordlist *addrs, *opts;
1850 if (!am_server && passwd[0] != '\0') {
1851 strlcpy(secret, passwd, MAXWORDLEN);
1853 filename = _PATH_SRPFILE;
1856 fp = fopen(filename, "r");
1858 error("Can't open srp secret file %s: %m", filename);
1861 check_access(fp, filename);
1864 ret = scan_authfile(fp, client, server, secret, &addrs, &opts,
1865 filename, am_server);
1871 set_allowed_addrs(unit, addrs, opts);
1872 else if (opts != NULL)
1873 free_wordlist(opts);
1875 free_wordlist(addrs);
1882 * set_allowed_addrs() - set the list of allowed addresses.
1883 * Also looks for `--' indicating options to apply for this peer
1884 * and leaves the following words in extra_options.
1887 set_allowed_addrs(int unit, struct wordlist *addrs,
1888 struct wordlist *opts)
1891 struct wordlist *ap, **plink;
1892 struct permitted_ip *ip;
1893 char *ptr_word, *ptr_mask;
1896 u_int32_t a, mask, ah, offset;
1897 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1898 u_int32_t suggested_ip = 0;
1900 if (addresses[unit] != NULL)
1901 free(addresses[unit]);
1902 addresses[unit] = NULL;
1903 if (extra_options != NULL)
1904 free_wordlist(extra_options);
1905 extra_options = opts;
1908 * Count the number of IP addresses given.
1910 n = wordlist_count(addrs) + wordlist_count(noauth_addrs);
1913 ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
1917 /* temporarily append the noauth_addrs list to addrs */
1918 for (plink = &addrs; *plink != NULL; plink = &(*plink)->next)
1920 *plink = noauth_addrs;
1923 for (ap = addrs; ap != NULL; ap = ap->next) {
1924 /* "-" means no addresses authorized, "*" means any address allowed */
1925 ptr_word = ap->word;
1926 if (strcmp(ptr_word, "-") == 0)
1928 if (strcmp(ptr_word, "*") == 0) {
1930 ip[n].base = ip[n].mask = 0;
1936 if (*ptr_word == '!') {
1941 mask = ~ (u_int32_t) 0;
1943 ptr_mask = strchr (ptr_word, '/');
1944 if (ptr_mask != NULL) {
1948 bit_count = (int) strtol (ptr_mask+1, &endp, 10);
1949 if (bit_count <= 0 || bit_count > 32) {
1950 warn("invalid address length %v in auth. address list",
1954 bit_count = 32 - bit_count; /* # bits in host part */
1956 offset = ifunit + 1;
1960 warn("invalid address length syntax: %v", ptr_mask+1);
1967 hp = gethostbyname(ptr_word);
1968 if (hp != NULL && hp->h_addrtype == AF_INET) {
1969 a = *(u_int32_t *)hp->h_addr;
1971 np = getnetbyname (ptr_word);
1972 if (np != NULL && np->n_addrtype == AF_INET) {
1973 a = htonl ((u_int32_t)np->n_net);
1974 if (ptr_mask == NULL) {
1975 /* calculate appropriate mask for net */
1978 mask = IN_CLASSA_NET;
1979 else if (IN_CLASSB(ah))
1980 mask = IN_CLASSB_NET;
1981 else if (IN_CLASSC(ah))
1982 mask = IN_CLASSC_NET;
1985 a = inet_addr (ptr_word);
1989 if (ptr_mask != NULL)
1992 if (a == (u_int32_t)-1L) {
1993 warn("unknown host %s in auth. address list", ap->word);
1997 if (offset >= ~mask) {
1998 warn("interface unit %d too large for subnet %v",
2002 a = htonl((ntohl(a) & mask) + offset);
2003 mask = ~(u_int32_t)0;
2005 ip[n].mask = htonl(mask);
2006 ip[n].base = a & ip[n].mask;
2008 if (~mask == 0 && suggested_ip == 0)
2013 ip[n].permit = 0; /* make the last entry forbid all addresses */
2014 ip[n].base = 0; /* to terminate the list */
2017 addresses[unit] = ip;
2020 * If the address given for the peer isn't authorized, or if
2021 * the user hasn't given one, AND there is an authorized address
2022 * which is a single host, then use that if we find one.
2024 if (suggested_ip != 0
2025 && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr))) {
2026 wo->hisaddr = suggested_ip;
2028 * Do we insist on this address? No, if there are other
2029 * addresses authorized than the suggested one.
2032 wo->accept_remote = 1;
2037 * auth_ip_addr - check whether the peer is authorized to use
2038 * a given IP address. Returns 1 if authorized, 0 otherwise.
2041 auth_ip_addr(int unit, u_int32_t addr)
2045 /* don't allow loopback or multicast address */
2046 if (bad_ip_adrs(addr))
2049 if (allowed_address_hook) {
2050 ok = allowed_address_hook(addr);
2051 if (ok >= 0) return ok;
2054 if (addresses[unit] != NULL) {
2055 ok = ip_addr_check(addr, addresses[unit]);
2061 return 0; /* no addresses authorized */
2062 return allow_any_ip || privileged || !have_route_to(addr);
2066 ip_addr_check(u_int32_t addr, struct permitted_ip *addrs)
2069 if ((addr & addrs->mask) == addrs->base)
2070 return addrs->permit;
2074 * bad_ip_adrs - return 1 if the IP address is one we don't want
2075 * to use, such as an address in the loopback net or a multicast address.
2076 * addr is in network byte order.
2079 bad_ip_adrs(u_int32_t addr)
2082 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
2083 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
2087 * some_ip_ok - check a wordlist to see if it authorizes any
2091 some_ip_ok(struct wordlist *addrs)
2093 for (; addrs != 0; addrs = addrs->next) {
2094 if (addrs->word[0] == '-')
2096 if (addrs->word[0] != '!')
2097 return 1; /* some IP address is allowed */
2103 * auth_number - check whether the remote number is allowed to connect.
2104 * Returns 1 if authorized, 0 otherwise.
2109 struct wordlist *wp = permitted_numbers;
2112 /* Allow all if no authorization list. */
2116 /* Allow if we have a match in the authorization list. */
2118 /* trailing '*' wildcard */
2119 l = strlen(wp->word);
2120 if ((wp->word)[l - 1] == '*')
2122 if (!strncasecmp(wp->word, remote_number, l))
2131 * check_access - complain if a secret file has too-liberal permissions.
2134 check_access(FILE *f, char *filename)
2138 if (fstat(fileno(f), &sbuf) < 0) {
2139 warn("cannot stat secret file %s: %m", filename);
2140 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
2141 warn("Warning - secret file %s has world and/or group access",
2148 * scan_authfile - Scan an authorization file for a secret suitable
2149 * for authenticating `client' on `server'. The return value is -1
2150 * if no secret is found, otherwise >= 0. The return value has
2151 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
2152 * NONWILD_SERVER set if the secret didn't have "*" for the server.
2153 * Any following words on the line up to a "--" (i.e. address authorization
2154 * info) are placed in a wordlist and returned in *addrs. Any
2155 * following words (extra options) are placed in a wordlist and
2156 * returned in *opts.
2157 * We assume secret is NULL or points to MAXWORDLEN bytes of space.
2158 * Flags are non-zero if we need two colons in the secret in order to
2162 scan_authfile(FILE *f, char *client, char *server,
2163 char *secret, struct wordlist **addrs,
2164 struct wordlist **opts, char *filename,
2168 int got_flag, best_flag;
2170 struct wordlist *ap, *addr_list, *alist, **app;
2171 char word[MAXWORDLEN];
2172 char atfile[MAXWORDLEN];
2173 char lsecret[MAXWORDLEN];
2181 if (!getword(f, word, &newline, filename))
2182 return -1; /* file is empty??? */
2187 * Skip until we find a word at the start of a line.
2189 while (!newline && getword(f, word, &newline, filename))
2192 break; /* got to end of file */
2195 * Got a client - check if it's a match or a wildcard.
2198 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2203 got_flag = NONWILD_CLIENT;
2206 * Now get a server and check if it matches.
2208 if (!getword(f, word, &newline, filename))
2212 if (!ISWILD(word)) {
2213 if (server != NULL && strcmp(word, server) != 0)
2215 got_flag |= NONWILD_SERVER;
2219 * Got some sort of a match - see if it's better than what
2222 if (got_flag <= best_flag)
2228 if (!getword(f, word, &newline, filename))
2234 * SRP-SHA1 authenticator should never be reading secrets from
2235 * a file. (Authenticatee may, though.)
2237 if (flags && ((cp = strchr(word, ':')) == NULL ||
2238 strchr(cp + 1, ':') == NULL))
2241 if (secret != NULL) {
2243 * Special syntax: @/pathname means read secret from file.
2245 if (word[0] == '@' && word[1] == '/') {
2246 strlcpy(atfile, word+1, sizeof(atfile));
2247 if ((sf = fopen(atfile, "r")) == NULL) {
2248 warn("can't open indirect secret file %s", atfile);
2251 check_access(sf, atfile);
2252 if (!getword(sf, word, &xxx, atfile)) {
2253 warn("no secret in indirect secret file %s", atfile);
2259 strlcpy(lsecret, word, sizeof(lsecret));
2263 * Now read address authorization info and make a wordlist.
2267 if (!getword(f, word, &newline, filename) || newline)
2269 ap = (struct wordlist *)
2270 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2272 novm("authorized addresses");
2273 ap->word = (char *) (ap + 1);
2274 strcpy(ap->word, word);
2281 * This is the best so far; remember it.
2283 best_flag = got_flag;
2285 free_wordlist(addr_list);
2288 strlcpy(secret, lsecret, MAXWORDLEN);
2294 /* scan for a -- word indicating the start of options */
2295 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2296 if (strcmp(ap->word, "--") == 0)
2298 /* ap = start of options */
2300 ap = ap->next; /* first option */
2301 free(*app); /* free the "--" word */
2302 *app = NULL; /* terminate addr list */
2306 else if (ap != NULL)
2310 else if (addr_list != NULL)
2311 free_wordlist(addr_list);
2317 * wordlist_count - return the number of items in a wordlist
2320 wordlist_count(struct wordlist *wp)
2324 for (n = 0; wp != NULL; wp = wp->next)
2330 * free_wordlist - release memory allocated for a wordlist.
2333 free_wordlist(struct wordlist *wp)
2335 struct wordlist *next;
2337 while (wp != NULL) {
2345 * auth_script_done - called when the auth-up or auth-down script
2349 auth_script_done(void *arg)
2351 auth_script_pid = 0;
2352 switch (auth_script_state) {
2354 if (auth_state == s_down) {
2355 auth_script_state = s_down;
2356 auth_script(_PATH_AUTHDOWN);
2360 if (auth_state == s_up) {
2361 auth_script_state = s_up;
2362 auth_script(_PATH_AUTHUP);
2369 * auth_script - execute a script with arguments
2370 * interface-name peer-name real-user tty speed
2373 auth_script(char *script)
2381 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
2382 user_name = pw->pw_name;
2384 slprintf(struid, sizeof(struid), "%d", getuid());
2387 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
2391 argv[2] = peer_authname;
2392 argv[3] = user_name;
2397 auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL, 0);
2403 have_eaptls_secret_server(char *client, char *server,
2404 int need_ip, int *lacks_ipp)
2409 struct wordlist *addrs;
2410 char servcertfile[MAXWORDLEN];
2411 char clicertfile[MAXWORDLEN];
2412 char cacertfile[MAXWORDLEN];
2413 char pkfile[MAXWORDLEN];
2415 filename = _PATH_EAPTLSSERVFILE;
2416 f = fopen(filename, "r");
2420 if (client != NULL && client[0] == 0)
2422 else if (server != NULL && server[0] == 0)
2426 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2427 cacertfile, pkfile, &addrs, NULL, filename,
2433 if (ret >= 0 && !eaptls_init_ssl(1, cacertfile, servcertfile,
2434 clicertfile, pkfile))
2438 if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
2444 free_wordlist(addrs);
2451 have_eaptls_secret_client(char *client, char *server)
2456 struct wordlist *addrs = NULL;
2457 char servcertfile[MAXWORDLEN];
2458 char clicertfile[MAXWORDLEN];
2459 char cacertfile[MAXWORDLEN];
2460 char pkfile[MAXWORDLEN];
2462 if (client != NULL && client[0] == 0)
2464 else if (server != NULL && server[0] == 0)
2467 if ((cacert_file || ca_path) && cert_file && privkey_file)
2472 filename = _PATH_EAPTLSCLIFILE;
2473 f = fopen(filename, "r");
2478 scan_authfile_eaptls(f, client, server, clicertfile, servcertfile,
2479 cacertfile, pkfile, &addrs, NULL, filename,
2484 if (ret >= 0 && !eaptls_init_ssl(0, cacertfile, clicertfile,
2485 servcertfile, pkfile))
2490 free_wordlist(addrs);
2497 scan_authfile_eaptls(FILE *f, char *client, char *server,
2498 char *cli_cert, char *serv_cert, char *ca_cert,
2499 char *pk, struct wordlist **addrs,
2500 struct wordlist **opts,
2501 char *filename, int flags)
2504 int got_flag, best_flag;
2505 struct wordlist *ap, *addr_list, *alist, **app;
2506 char word[MAXWORDLEN];
2513 if (!getword(f, word, &newline, filename))
2514 return -1; /* file is empty??? */
2519 * Skip until we find a word at the start of a line.
2521 while (!newline && getword(f, word, &newline, filename));
2523 break; /* got to end of file */
2526 * Got a client - check if it's a match or a wildcard.
2529 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
2534 got_flag = NONWILD_CLIENT;
2537 * Now get a server and check if it matches.
2539 if (!getword(f, word, &newline, filename))
2543 if (!ISWILD(word)) {
2544 if (server != NULL && strcmp(word, server) != 0)
2546 got_flag |= NONWILD_SERVER;
2550 * Got some sort of a match - see if it's better than what
2553 if (got_flag <= best_flag)
2559 if (!getword(f, word, &newline, filename))
2563 if (strcmp(word, "-") != 0) {
2564 strlcpy(cli_cert, word, MAXWORDLEN);
2571 if (!getword(f, word, &newline, filename))
2575 if (strcmp(word, "-") != 0) {
2576 strlcpy(serv_cert, word, MAXWORDLEN);
2583 if (!getword(f, word, &newline, filename))
2587 strlcpy(ca_cert, word, MAXWORDLEN);
2592 if (!getword(f, word, &newline, filename))
2596 strlcpy(pk, word, MAXWORDLEN);
2600 * Now read address authorization info and make a wordlist.
2604 if (!getword(f, word, &newline, filename) || newline)
2606 ap = (struct wordlist *)
2607 malloc(sizeof(struct wordlist) + strlen(word) + 1);
2609 novm("authorized addresses");
2610 ap->word = (char *) (ap + 1);
2611 strcpy(ap->word, word);
2617 * This is the best so far; remember it.
2619 best_flag = got_flag;
2621 free_wordlist(addr_list);
2628 /* scan for a -- word indicating the start of options */
2629 for (app = &addr_list; (ap = *app) != NULL; app = &ap->next)
2630 if (strcmp(ap->word, "--") == 0)
2632 /* ap = start of options */
2634 ap = ap->next; /* first option */
2635 free(*app); /* free the "--" word */
2636 *app = NULL; /* terminate addr list */
2640 else if (ap != NULL)
2644 else if (addr_list != NULL)
2645 free_wordlist(addr_list);
2652 get_eaptls_secret(int unit, char *client, char *server,
2653 char *clicertfile, char *servcertfile, char *cacertfile,
2654 char *capath, char *pkfile, char *pkcs12, int am_server)
2658 char *filename = NULL;
2659 struct wordlist *addrs = NULL;
2660 struct wordlist *opts = NULL;
2662 /* maybe overkill, but it eases debugging */
2663 bzero(clicertfile, MAXWORDLEN);
2664 bzero(servcertfile, MAXWORDLEN);
2665 bzero(cacertfile, MAXWORDLEN);
2666 bzero(capath, MAXWORDLEN);
2667 bzero(pkfile, MAXWORDLEN);
2668 bzero(pkcs12, MAXWORDLEN);
2670 /* the ca+cert+privkey can also be specified as options */
2671 if (!am_server && (cacert_file || ca_path) && cert_file && privkey_file )
2673 strlcpy( clicertfile, cert_file, MAXWORDLEN );
2675 strlcpy( cacertfile, cacert_file, MAXWORDLEN );
2677 strlcpy( capath, ca_path, MAXWORDLEN );
2678 strlcpy( pkfile, privkey_file, MAXWORDLEN );
2680 else if (!am_server && pkcs12_file)
2682 strlcpy( pkcs12, pkcs12_file, MAXWORDLEN );
2684 strlcpy( cacertfile, cacert_file, MAXWORDLEN );
2686 strlcpy( capath, ca_path, MAXWORDLEN );
2690 filename = (am_server ? _PATH_EAPTLSSERVFILE : _PATH_EAPTLSCLIFILE);
2693 fp = fopen(filename, "r");
2696 error("Can't open eap-tls secret file %s: %m", filename);
2700 check_access(fp, filename);
2702 ret = scan_authfile_eaptls(fp, client, server, clicertfile, servcertfile,
2703 cacertfile, pkfile, &addrs, &opts, filename, 0);
2707 if (ret < 0) return 0;
2710 if (eaptls_passwd_hook)
2712 dbglog( "Calling eaptls password hook" );
2713 if ( (*eaptls_passwd_hook)(pkfile, passwd) < 0)
2715 error("Unable to obtain EAP-TLS password for %s (%s) from plugin",
2721 set_allowed_addrs(unit, addrs, opts);
2722 else if (opts != NULL)
2723 free_wordlist(opts);
2725 free_wordlist(addrs);