2 * auth.c - PPP authentication and phase control.
4 * Copyright (c) 1993 The Australian National University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by the Australian National University. The name of the University
13 * may not be used to endorse or promote products derived from this
14 * software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 * Copyright (c) 1989 Carnegie Mellon University.
20 * All rights reserved.
22 * Redistribution and use in source and binary forms are permitted
23 * provided that the above copyright notice and this paragraph are
24 * duplicated in all such forms and that any documentation,
25 * advertising materials, and other materials related to such
26 * distribution and use acknowledge that the software was developed
27 * by Carnegie Mellon University. The name of the
28 * University may not be used to endorse or promote products derived
29 * from this software without specific prior written permission.
30 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
32 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
34 * $FreeBSD: src/usr.sbin/pppd/auth.c,v 1.24.2.2 2002/03/12 08:55:22 maxim Exp $
35 * $DragonFly: src/usr.sbin/pppd/auth.c,v 1.3 2003/11/03 19:31:40 eirikn Exp $
46 #include <sys/types.h>
48 #include <sys/socket.h>
51 #if defined(_PATH_LASTLOG) && defined(_linux_)
56 #include <netinet/in.h>
57 #include <arpa/inet.h>
62 #include <security/pam_appl.h>
68 #define PW_PPP PW_LOGIN
81 #include "pathnames.h"
83 /* Used for storing a sequence of words. Usually malloced. */
85 struct wordlist *next;
89 /* Bits in scan_authfile return value */
90 #define NONWILD_SERVER 1
91 #define NONWILD_CLIENT 2
93 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
98 /* The name by which the peer authenticated itself to us. */
99 char peer_authname[MAXNAMELEN];
101 /* Records which authentication operations haven't completed yet. */
102 static int auth_pending[NUM_PPP];
104 /* Set if we have successfully called plogin() */
105 static int logged_in;
107 /* Set if not wild or blank */
108 static int non_wildclient;
110 /* Set if we have run the /etc/ppp/auth-up script. */
111 static int did_authup;
113 /* List of addresses which the peer may use. */
114 static struct wordlist *addresses[NUM_PPP];
116 /* Number of network protocols which we have opened. */
117 static int num_np_open;
119 /* Number of network protocols which have come up. */
120 static int num_np_up;
122 /* Set if we got the contents of passwd[] from the pap-secrets file. */
123 static int passwd_from_file;
125 /* Bits in auth_pending[] */
126 #define PAP_WITHPEER 1
128 #define CHAP_WITHPEER 4
131 extern char *crypt(const char *, const char *);
133 /* Prototypes for procedures local to this file. */
135 static void network_phase(int);
136 static void check_idle(void *);
137 static void connect_time_expired(void *);
138 static int plogin(char *, char *, char **, int *);
139 static void plogout(void);
140 static int null_login(int);
141 static int get_pap_passwd(char *);
142 static int have_pap_secret(void);
143 static int have_chap_secret(char *, char *, u_int32_t);
144 static int ip_addr_check(u_int32_t, struct wordlist *);
145 static int scan_authfile(FILE *, char *, char *, u_int32_t, char *,
146 struct wordlist **, char *);
147 static void free_wordlist(struct wordlist *);
148 static void auth_set_ip_addr(int);
149 static void auth_script(char *);
150 static void set_allowed_addrs(int, struct wordlist *);
153 * An Open on LCP has requested a change from Dead to Establish phase.
154 * Do what's necessary to bring the physical layer up.
163 * LCP has terminated the link; go to the Dead phase and take the
164 * physical layer down.
167 link_terminated(unit)
170 extern time_t etime, stime;
173 if (phase == PHASE_DEAD)
178 etime = time((time_t *) NULL);
179 minutes = (etime-stime)/60;
180 syslog(LOG_NOTICE, "Connection terminated, connected for %d minutes\n",
181 minutes > 1 ? minutes : 1);
185 * LCP has gone down; it will either die or try to re-establish.
192 struct protent *protp;
195 auth_script(_PATH_AUTHDOWN);
198 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
199 if (!protp->enabled_flag)
201 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
202 (*protp->lowerdown)(unit);
203 if (protp->protocol < 0xC000 && protp->close != NULL)
204 (*protp->close)(unit, "LCP down");
208 if (phase != PHASE_DEAD)
209 phase = PHASE_TERMINATE;
213 * The link is established.
214 * Proceed to the Dead, Authenticate or Network phase as appropriate.
217 link_established(unit)
221 lcp_options *wo = &lcp_wantoptions[unit];
222 lcp_options *go = &lcp_gotoptions[unit];
223 lcp_options *ho = &lcp_hisoptions[unit];
225 struct protent *protp;
228 * Tell higher-level protocols that LCP is up.
230 for (i = 0; (protp = protocols[i]) != NULL; ++i)
231 if (protp->protocol != PPP_LCP && protp->enabled_flag
232 && protp->lowerup != NULL)
233 (*protp->lowerup)(unit);
235 if (auth_required && !(go->neg_chap || go->neg_upap)) {
237 * We wanted the peer to authenticate itself, and it refused:
238 * treat it as though it authenticated with PAP using a username
239 * of "" and a password of "". If that's not OK, boot it out.
241 if (!wo->neg_upap || !null_login(unit)) {
242 syslog(LOG_WARNING, "peer refused to authenticate");
243 lcp_close(unit, "peer refused to authenticate");
248 phase = PHASE_AUTHENTICATE;
251 ChapAuthPeer(unit, our_name, go->chap_mdtype);
253 } else if (go->neg_upap) {
258 ChapAuthWithPeer(unit, user, ho->chap_mdtype);
259 auth |= CHAP_WITHPEER;
260 } else if (ho->neg_upap) {
261 if (passwd[0] == 0) {
262 passwd_from_file = 1;
263 if (!get_pap_passwd(passwd))
264 syslog(LOG_ERR, "No secret found for PAP login");
266 upap_authwithpeer(unit, user, passwd);
267 auth |= PAP_WITHPEER;
269 auth_pending[unit] = auth;
276 * Proceed to the network phase.
283 struct protent *protp;
284 lcp_options *go = &lcp_gotoptions[unit];
287 * If the peer had to authenticate, run the auth-up script now.
289 if ((go->neg_chap || go->neg_upap) && !did_authup) {
290 auth_script(_PATH_AUTHUP);
296 * If we negotiated callback, do it now.
299 phase = PHASE_CALLBACK;
300 (*cbcp_protent.open)(unit);
305 phase = PHASE_NETWORK;
308 set_filters(&pass_filter, &active_filter);
310 for (i = 0; (protp = protocols[i]) != NULL; ++i)
311 if (protp->protocol < 0xC000 && protp->enabled_flag
312 && protp->open != NULL) {
313 (*protp->open)(unit);
314 if (protp->protocol != PPP_CCP)
318 if (num_np_open == 0)
320 lcp_close(0, "No network protocols running");
324 * The peer has failed to authenticate himself using `protocol'.
327 auth_peer_fail(unit, protocol)
331 * Authentication failure: take the link down
333 lcp_close(unit, "Authentication failed");
337 * The peer has been successfully authenticated using `protocol'.
340 auth_peer_success(unit, protocol, name, namelen)
355 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
361 * Save the authenticated name of the peer for later.
363 if (namelen > sizeof(peer_authname) - 1)
364 namelen = sizeof(peer_authname) - 1;
365 BCOPY(name, peer_authname, namelen);
366 peer_authname[namelen] = 0;
369 * If we have overridden addresses based on auth info
370 * then set that information now before continuing.
372 auth_set_ip_addr(unit);
374 script_setenv("PEERNAME", peer_authname);
377 * If there is no more authentication still to be done,
378 * proceed to the network (or callback) phase.
380 if ((auth_pending[unit] &= ~bit) == 0)
385 * We have failed to authenticate ourselves to the peer using `protocol'.
388 auth_withpeer_fail(unit, protocol)
391 if (passwd_from_file)
392 BZERO(passwd, MAXSECRETLEN);
394 * We've failed to authenticate ourselves to our peer.
395 * He'll probably take the link down, and there's not much
396 * we can do except wait for that.
401 * We have successfully authenticated ourselves with the peer using `protocol'.
404 auth_withpeer_success(unit, protocol)
414 if (passwd_from_file)
415 BZERO(passwd, MAXSECRETLEN);
419 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
425 * If we have overridden addresses based on auth info
426 * then set that information now before continuing.
428 auth_set_ip_addr(unit);
431 * If there is no more authentication still being done,
432 * proceed to the network (or callback) phase.
434 if ((auth_pending[unit] &= ~bit) == 0)
440 * np_up - a network protocol has come up.
446 if (num_np_up == 0) {
448 * At this point we consider that the link has come up successfully.
452 if (idle_time_limit > 0)
453 TIMEOUT(check_idle, NULL, idle_time_limit);
456 * Set a timeout to close the connection once the maximum
457 * connect time has expired.
460 TIMEOUT(connect_time_expired, 0, maxconnect);
463 * Detach now, if the updetach option was given.
472 * np_down - a network protocol has gone down.
478 if (--num_np_up == 0 && idle_time_limit > 0) {
479 UNTIMEOUT(check_idle, NULL);
484 * np_finished - a network protocol has finished using the link.
487 np_finished(unit, proto)
490 if (--num_np_open <= 0) {
491 /* no further use for the link: shut up shop. */
492 lcp_close(0, "No network protocols running");
497 * check_idle - check whether the link has been idle for long
498 * enough that we can shut it down.
504 struct ppp_idle idle;
507 if (!get_idle_time(0, &idle))
509 itime = MIN(idle.xmit_idle, idle.recv_idle);
510 if (itime >= idle_time_limit) {
511 /* link is idle: shut it down. */
512 syslog(LOG_INFO, "Terminating connection due to lack of activity.");
513 lcp_close(0, "Link inactive");
515 TIMEOUT(check_idle, NULL, idle_time_limit - itime);
520 * connect_time_expired - log a message and close the connection.
523 connect_time_expired(arg)
526 syslog(LOG_INFO, "Connect time expired");
527 lcp_close(0, "Connect time expired"); /* Close connection */
531 * auth_check_options - called to check authentication options.
536 lcp_options *wo = &lcp_wantoptions[0];
538 ipcp_options *ipwo = &ipcp_wantoptions[0];
541 /* Default our_name to hostname, and user to our_name */
542 if (our_name[0] == 0 || usehostname)
543 strcpy(our_name, hostname);
545 strcpy(user, our_name);
547 /* If authentication is required, ask peer for CHAP or PAP. */
548 if (auth_required && !wo->neg_chap && !wo->neg_upap) {
554 * Check whether we have appropriate secrets to use
555 * to authenticate the peer.
557 can_auth = wo->neg_upap && (uselogin || have_pap_secret());
558 if (!can_auth && wo->neg_chap) {
559 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
560 can_auth = have_chap_secret(remote_name, our_name, remote);
563 if (auth_required && !can_auth) {
564 option_error("peer authentication required but no suitable secret(s) found\n");
565 if (remote_name[0] == 0)
566 option_error("for authenticating any peer to us (%s)\n", our_name);
568 option_error("for authenticating peer %s to us (%s)\n",
569 remote_name, our_name);
574 * Check whether the user tried to override certain values
577 if (!auth_required && auth_req_info.priv > 0) {
578 if (!default_device && devnam_info.priv == 0) {
579 option_error("can't override device name when noauth option used");
582 if ((connector != NULL && connector_info.priv == 0)
583 || (disconnector != NULL && disconnector_info.priv == 0)
584 || (welcomer != NULL && welcomer_info.priv == 0)) {
585 option_error("can't override connect, disconnect or welcome");
586 option_error("option values when noauth option used");
593 * auth_reset - called when LCP is starting negotiations to recheck
594 * authentication options, i.e. whether we have appropriate secrets
595 * to use for authenticating ourselves and/or the peer.
601 lcp_options *go = &lcp_gotoptions[unit];
602 lcp_options *ao = &lcp_allowoptions[0];
603 ipcp_options *ipwo = &ipcp_wantoptions[0];
606 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
607 ao->neg_chap = !refuse_chap
608 && have_chap_secret(user, remote_name, (u_int32_t)0);
610 if (go->neg_upap && !uselogin && !have_pap_secret())
613 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
614 if (!have_chap_secret(remote_name, our_name, remote))
621 * check_passwd - Check the user name and passwd against the PAP secrets
622 * file. If requested, also check against the system password database,
623 * and login the user if OK.
626 * UPAP_AUTHNAK: Authentication failed.
627 * UPAP_AUTHACK: Authentication succeeded.
628 * In either case, msg points to an appropriate message.
631 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg, msglen)
643 struct wordlist *addrs;
645 ipcp_options *ipwo = &ipcp_wantoptions[unit];
646 char passwd[256], user[256];
647 char secret[MAXWORDLEN];
648 static int attempts = 0;
652 * Make copies of apasswd and auser, then null-terminate them.
654 len = MIN(passwdlen, sizeof(passwd) - 1);
655 BCOPY(apasswd, passwd, len);
657 len = MIN(userlen, sizeof(user) - 1);
658 BCOPY(auser, user, len);
663 * Open the file of pap secrets and scan for a suitable secret
664 * for authenticating this user.
666 filename = _PATH_UPAPFILE;
669 f = fopen(filename, "r");
671 syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
675 check_access(f, filename);
676 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
677 if (scan_authfile(f, user, our_name, remote,
678 secret, &addrs, filename) < 0) {
679 warn("no PAP secret found for %s", user);
681 if (secret[0] != 0) {
682 /* password given in pap-secrets - must match */
683 if ((cryptpap || strcmp(passwd, secret) != 0)
684 && strcmp(crypt(passwd, secret), secret) != 0) {
686 warn("PAP authentication failure for %s", user);
693 if (uselogin && ret == UPAP_AUTHACK) {
694 ret = plogin(user, passwd, msg, msglen);
695 if (ret == UPAP_AUTHNAK) {
696 syslog(LOG_WARNING, "PAP login failure for %s", user);
700 if (ret == UPAP_AUTHNAK) {
701 if (*msg == (char *) 0)
702 *msg = "Login incorrect";
703 *msglen = strlen(*msg);
705 * Frustrate passwd stealer programs.
706 * Allow 10 tries, but start backing off after 3 (stolen from login).
707 * On 10'th, drop the connection.
709 if (attempts++ >= 10) {
710 syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
711 attempts, devnam, user);
715 sleep((u_int) (attempts - 3) * 5);
717 free_wordlist(addrs);
720 attempts = 0; /* Reset count */
721 if (*msg == (char *) 0)
723 *msglen = strlen(*msg);
724 set_allowed_addrs(unit, addrs);
727 BZERO(passwd, sizeof(passwd));
728 BZERO(secret, sizeof(secret));
734 * Check if an "entry" is in the file "fname" - used by ppplogin.
735 * Taken from libexec/ftpd/ftpd.c
736 * Returns: 0 if not found, 1 if found, 2 if file can't be opened for reading.
739 checkfile(fname, name)
745 char *p, line[BUFSIZ];
747 if ((fd = fopen(fname, "r")) != NULL) {
748 while (fgets(line, sizeof(line), fd) != NULL)
749 if ((p = strchr(line, '\n')) != NULL) {
753 if (strcmp(line, name) == 0) {
766 * This function is needed for PAM.
770 static char *PAM_username = "";
771 static char *PAM_password = "";
773 #ifdef PAM_ESTABLISH_CRED /* new PAM defines :(^ */
774 #define MY_PAM_STRERROR(err_code) (char *) pam_strerror(pamh,err_code)
776 #define MY_PAM_STRERROR(err_code) (char *) pam_strerror(err_code)
779 static int pam_conv (int num_msg,
780 const struct pam_message **msg,
781 struct pam_response **resp,
784 int count = 0, replies = 0;
785 struct pam_response *reply = NULL;
788 for (count = 0; count < num_msg; count++)
790 size += sizeof (struct pam_response);
791 reply = realloc (reply, size); /* ANSI: is malloc() if reply==NULL */
795 switch (msg[count]->msg_style)
797 case PAM_PROMPT_ECHO_ON:
798 reply[replies].resp_retcode = PAM_SUCCESS;
799 reply[replies++].resp = strdup(PAM_username); /* never NULL */
802 case PAM_PROMPT_ECHO_OFF:
803 reply[replies].resp_retcode = PAM_SUCCESS;
804 reply[replies++].resp = strdup(PAM_password); /* never NULL */
808 reply[replies].resp_retcode = PAM_SUCCESS;
809 reply[replies++].resp = NULL;
829 * plogin - Check the user name and password against the system
830 * password database, and login the user if OK.
833 * UPAP_AUTHNAK: Login failed.
834 * UPAP_AUTHACK: Login succeeded.
835 * In either case, msg points to an appropriate message.
837 * UPAP_AUTHACK should only be returned *after* wtmp and utmp are updated.
841 plogin(user, passwd, msg, msglen)
850 struct pam_conv pam_conversation;
854 * Fill the pam_conversion structure
856 memset (&pam_conversation, '\0', sizeof (struct pam_conv));
857 pam_conversation.conv = &pam_conv;
859 pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
861 if (pam_error != PAM_SUCCESS) {
862 *msg = MY_PAM_STRERROR (pam_error);
866 * Define the fields for the credintial validation
868 (void) pam_set_item (pamh, PAM_TTY, devnam);
870 PAM_password = passwd;
874 pam_error = pam_authenticate (pamh, PAM_SILENT);
875 if (pam_error == PAM_SUCCESS) {
876 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
878 /* start a session for this user. Session closed when link ends. */
879 if (pam_error == PAM_SUCCESS)
880 (void) pam_open_session (pamh, PAM_SILENT);
883 *msg = MY_PAM_STRERROR (pam_error);
890 (void) pam_end (pamh, pam_error);
892 if (pam_error != PAM_SUCCESS)
895 * Use the non-PAM methods directly
897 #else /* #ifdef USE_PAM */
906 struct spwd *getspnam();
912 return (UPAP_AUTHNAK);
915 * Check that the user is not listed in /etc/ppp/ppp.deny
916 * and that the user's shell is listed in /etc/ppp/ppp.shells
917 * if /etc/ppp/ppp.shells exists.
920 if (checkfile(_PATH_PPPDENY, user) == 1) {
921 syslog(LOG_WARNING, "upap user %s: login denied in %s",
922 user, _PATH_PPPDENY);
923 return (UPAP_AUTHNAK);
926 if (checkfile(_PATH_PPPSHELLS, pw->pw_shell) == 0) {
927 syslog(LOG_WARNING, "upap user %s: shell %s not in %s",
928 user, pw->pw_shell, _PATH_PPPSHELLS);
929 return (UPAP_AUTHNAK);
933 spwd = getspnam(user);
936 /* check the age of the password entry */
937 long now = time(NULL) / 86400L;
939 if ((spwd->sp_expire > 0 && now >= spwd->sp_expire)
940 || ((spwd->sp_max >= 0 && spwd->sp_max < 10000)
941 && spwd->sp_lstchg >= 0
942 && now >= spwd->sp_lstchg + spwd->sp_max)) {
943 syslog(LOG_WARNING, "Password for %s has expired", user);
944 return (UPAP_AUTHNAK);
946 pw->pw_passwd = spwd->sp_pwdp;
951 * If no passwd, don't let them login.
953 if (pw->pw_passwd == NULL || *pw->pw_passwd == '\0'
954 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
955 return (UPAP_AUTHNAK);
958 (void)gettimeofday(&tp, (struct timezone *)NULL);
959 if (tp.tv_sec >= pw->pw_expire) {
960 syslog(LOG_INFO, "pap user %s account expired", user);
961 return (UPAP_AUTHNAK);
965 /* These functions are not enabled for PAM. The reason for this is that */
966 /* there is not necessarily a "passwd" entry for this user. That is */
967 /* real purpose of 'PAM' -- to virtualize the account data from the */
968 /* application. If you want to do the same thing, write the entry in */
969 /* the 'session' hook. */
971 /* Log in wtmp and utmp using login() */
974 if (strncmp(tty, _PATH_DEV, sizeof _PATH_DEV - 1) == 0)
977 if (logout(tty)) /* Already entered (by login?) */
978 logwtmp(tty, "", "");
980 #if defined(_PATH_LASTLOG)
985 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
986 (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
987 memset((void *)&ll, 0, sizeof(ll));
988 (void)time(&ll.ll_time);
989 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
990 (void)write(fd, (char *)&ll, sizeof(ll));
996 memset((void *)&utmp, 0, sizeof(utmp));
997 (void)time(&utmp.ut_time);
998 (void)strncpy(utmp.ut_name, user, sizeof(utmp.ut_name));
999 (void)strncpy(utmp.ut_host, ":PPP", sizeof(utmp.ut_host));
1000 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
1001 login(&utmp); /* This logs us in wtmp too */
1003 #endif /* #ifdef USE_PAM */
1005 syslog(LOG_INFO, "user %s logged in", user);
1008 return (UPAP_AUTHACK);
1012 * plogout - Logout the user.
1018 struct pam_conv pam_conversation;
1022 * Fill the pam_conversion structure. The PAM specification states that the
1023 * session must be able to be closed by a totally different handle from which
1024 * it was created. Hold the PAM group to their own specification!
1026 memset (&pam_conversation, '\0', sizeof (struct pam_conv));
1027 pam_conversation.conv = &pam_conv;
1029 pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
1030 if (pam_error == PAM_SUCCESS) {
1031 (void) pam_set_item (pamh, PAM_TTY, devnam);
1032 (void) pam_close_session (pamh, PAM_SILENT);
1033 (void) pam_end (pamh, PAM_SUCCESS);
1040 if (strncmp(tty, _PATH_DEV, sizeof _PATH_DEV - 1) == 0)
1042 logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
1043 logout(tty); /* Wipe out utmp */
1051 * null_login - Check if a username of "" and a password of "" are
1052 * acceptable, and iff so, set the list of acceptable IP addresses
1062 struct wordlist *addrs;
1063 char secret[MAXWORDLEN];
1066 * Open the file of pap secrets and scan for a suitable secret.
1067 * We don't accept a wildcard client.
1069 filename = _PATH_UPAPFILE;
1071 f = fopen(filename, "r");
1074 check_access(f, filename);
1076 i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
1077 ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
1078 BZERO(secret, sizeof(secret));
1081 set_allowed_addrs(unit, addrs);
1083 free_wordlist(addrs);
1091 * get_pap_passwd - get a password for authenticating ourselves with
1092 * our peer using PAP. Returns 1 on success, 0 if no suitable password
1096 get_pap_passwd(passwd)
1102 struct wordlist *addrs;
1103 char secret[MAXWORDLEN];
1105 filename = _PATH_UPAPFILE;
1107 f = fopen(filename, "r");
1110 check_access(f, filename);
1111 ret = scan_authfile(f, user,
1112 remote_name[0]? remote_name: NULL,
1113 (u_int32_t)0, secret, NULL, filename);
1117 if (passwd != NULL) {
1118 strncpy(passwd, secret, MAXSECRETLEN);
1119 passwd[MAXSECRETLEN-1] = 0;
1121 BZERO(secret, sizeof(secret));
1127 * have_pap_secret - check whether we have a PAP file with any
1128 * secrets that we could possibly use for authenticating the peer.
1136 ipcp_options *ipwo = &ipcp_wantoptions[0];
1139 filename = _PATH_UPAPFILE;
1140 f = fopen(filename, "r");
1144 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
1145 ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
1155 * have_chap_secret - check whether we have a CHAP file with a
1156 * secret that we could possibly use for authenticating `client'
1157 * on `server'. Either can be the null string, meaning we don't
1158 * know the identity yet.
1161 have_chap_secret(client, server, remote)
1170 filename = _PATH_CHAPFILE;
1171 f = fopen(filename, "r");
1177 else if (server[0] == 0)
1180 ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
1190 * get_secret - open the CHAP secret file and return the secret
1191 * for authenticating the given client on the given server.
1192 * (We could be either client or server).
1195 get_secret(unit, client, server, secret, secret_len, save_addrs)
1206 struct wordlist *addrs;
1207 char secbuf[MAXWORDLEN];
1209 filename = _PATH_CHAPFILE;
1213 f = fopen(filename, "r");
1215 syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
1218 check_access(f, filename);
1220 ret = scan_authfile(f, client, server, (u_int32_t)0,
1221 secbuf, &addrs, filename);
1227 set_allowed_addrs(unit, addrs);
1229 len = strlen(secbuf);
1230 if (len > MAXSECRETLEN) {
1231 syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
1234 BCOPY(secbuf, secret, len);
1235 BZERO(secbuf, sizeof(secbuf));
1242 * set_allowed_addrs() - set the list of allowed addresses.
1245 set_allowed_addrs(unit, addrs)
1247 struct wordlist *addrs;
1249 if (addresses[unit] != NULL)
1250 free_wordlist(addresses[unit]);
1251 addresses[unit] = addrs;
1254 * If there's only one authorized address we might as well
1255 * ask our peer for that one right away
1257 if (addrs != NULL && addrs->next == NULL) {
1258 char *p = addrs->word;
1259 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1263 if (*p != '!' && *p != '-' && strchr(p, '/') == NULL) {
1264 hp = gethostbyname(p);
1265 if (hp != NULL && hp->h_addrtype == AF_INET)
1266 a = *(u_int32_t *)hp->h_addr;
1269 if (a != (u_int32_t) -1)
1276 auth_set_ip_addr(unit)
1279 struct wordlist *addrs;
1281 if (non_wildclient && (addrs = addresses[unit]) != NULL) {
1282 for (; addrs != NULL; addrs = addrs->next) {
1283 /* Look for address overrides, and set them if we have any */
1284 if (strchr(addrs->word, ':') != NULL) {
1285 if (setipaddr(addrs->word))
1293 * auth_ip_addr - check whether the peer is authorized to use
1294 * a given IP address. Returns 1 if authorized, 0 otherwise.
1297 auth_ip_addr(unit, addr)
1301 return ip_addr_check(addr, addresses[unit]);
1305 ip_addr_check(addr, addrs)
1307 struct wordlist *addrs;
1310 u_int32_t a, mask, ah;
1312 char *ptr_word, *ptr_mask;
1316 /* don't allow loopback or multicast address */
1317 if (bad_ip_adrs(addr))
1321 return !auth_required; /* no addresses authorized */
1324 for (; addrs != NULL; addrs = addrs->next) {
1326 /* "-" means no addresses authorized, "*" means any address allowed */
1327 ptr_word = addrs->word;
1328 if (strcmp(ptr_word, "-") == 0)
1330 if (strcmp(ptr_word, "*") == 0)
1334 * A colon in the string means that we wish to force a specific
1335 * local:remote address, but we ignore these for now.
1337 if (strchr(addrs->word, ':') != NULL)
1342 if (*ptr_word == '!') {
1347 mask = ~ (u_int32_t) 0;
1348 ptr_mask = strchr (ptr_word, '/');
1349 if (ptr_mask != NULL) {
1352 bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
1353 if (bit_count <= 0 || bit_count > 32) {
1354 syslog (LOG_WARNING,
1355 "invalid address length %s in auth. address list",
1360 mask <<= 32 - bit_count;
1363 hp = gethostbyname(ptr_word);
1364 if (hp != NULL && hp->h_addrtype == AF_INET) {
1365 a = *(u_int32_t *)hp->h_addr;
1367 np = getnetbyname (ptr_word);
1368 if (np != NULL && np->n_addrtype == AF_INET) {
1369 a = htonl (*(u_int32_t *)np->n_net);
1370 if (ptr_mask == NULL) {
1371 /* calculate appropriate mask for net */
1374 mask = IN_CLASSA_NET;
1375 else if (IN_CLASSB(ah))
1376 mask = IN_CLASSB_NET;
1377 else if (IN_CLASSC(ah))
1378 mask = IN_CLASSC_NET;
1381 a = inet_addr (ptr_word);
1385 if (ptr_mask != NULL)
1388 if (a == (u_int32_t)-1L)
1389 syslog (LOG_WARNING,
1390 "unknown host %s in auth. address list",
1393 /* Here a and addr are in network byte order,
1394 and mask is in host order. */
1395 if (((addr ^ a) & htonl(mask)) == 0)
1399 return x == y; /* not in list => can't have it */
1403 * bad_ip_adrs - return 1 if the IP address is one we don't want
1404 * to use, such as an address in the loopback net or a multicast address.
1405 * addr is in network byte order.
1412 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1413 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1417 * check_access - complain if a secret file has too-liberal permissions.
1420 check_access(f, filename)
1426 if (fstat(fileno(f), &sbuf) < 0) {
1427 syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
1428 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
1429 syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
1435 * scan_authfile - Scan an authorization file for a secret suitable
1436 * for authenticating `client' on `server'. The return value is -1
1437 * if no secret is found, otherwise >= 0. The return value has
1438 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
1439 * NONWILD_SERVER set if the secret didn't have "*" for the server.
1440 * Any following words on the line (i.e. address authorization
1441 * info) are placed in a wordlist and returned in *addrs.
1444 scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
1450 struct wordlist **addrs;
1454 int got_flag, best_flag;
1456 struct wordlist *ap, *addr_list, *alist, *alast;
1457 char word[MAXWORDLEN];
1458 char atfile[MAXWORDLEN];
1459 char lsecret[MAXWORDLEN];
1464 if (!getword(f, word, &newline, filename))
1465 return -1; /* file is empty??? */
1470 * Skip until we find a word at the start of a line.
1472 while (!newline && getword(f, word, &newline, filename))
1475 break; /* got to end of file */
1478 * Got a client - check if it's a match or a wildcard.
1481 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
1486 got_flag = NONWILD_CLIENT;
1489 * Now get a server and check if it matches.
1491 if (!getword(f, word, &newline, filename))
1495 if (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
1498 got_flag |= NONWILD_SERVER;
1501 * Got some sort of a match - see if it's better than what
1504 if (got_flag <= best_flag)
1510 if (!getword(f, word, &newline, filename))
1516 * Special syntax: @filename means read secret from file.
1518 if (word[0] == '@') {
1519 strcpy(atfile, word+1);
1520 if ((sf = fopen(atfile, "r")) == NULL) {
1521 syslog(LOG_WARNING, "can't open indirect secret file %s",
1525 check_access(sf, atfile);
1526 if (!getword(sf, word, &xxx, atfile)) {
1527 syslog(LOG_WARNING, "no secret in indirect secret file %s",
1535 strcpy(lsecret, word);
1538 * Now read address authorization info and make a wordlist.
1540 alist = alast = NULL;
1542 if (!getword(f, word, &newline, filename) || newline)
1544 ap = (struct wordlist *) malloc(sizeof(struct wordlist)
1547 novm("authorized addresses");
1549 strcpy(ap->word, word);
1558 * Check if the given IP address is allowed by the wordlist.
1560 if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
1561 free_wordlist(alist);
1566 * This is the best so far; remember it.
1568 best_flag = got_flag;
1570 free_wordlist(addr_list);
1573 strcpy(secret, lsecret);
1581 else if (addr_list != NULL)
1582 free_wordlist(addr_list);
1584 non_wildclient = (best_flag & NONWILD_CLIENT) && client != NULL &&
1590 * free_wordlist - release memory allocated for a wordlist.
1594 struct wordlist *wp;
1596 struct wordlist *next;
1598 while (wp != NULL) {
1606 * auth_script - execute a script with arguments
1607 * interface-name peer-name real-user tty speed
1619 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
1620 user_name = pw->pw_name;
1622 sprintf(struid, "%d", getuid());
1625 sprintf(strspeed, "%d", baud_rate);
1629 argv[2] = peer_authname;
1630 argv[3] = user_name;
1635 run_program(script, argv, 0);