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.
36 static char rcsid[] = "$Id: auth.c,v 1.31 1997/04/30 05:50:16 paulus Exp $";
46 #include <sys/types.h>
48 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <arpa/inet.h>
55 #include <security/pam_appl.h>
56 #include <security/pam_modules.h>
62 #include <shadow/pwauth.h>
65 #define PW_PPP PW_LOGIN
78 #include "pathnames.h"
80 /* Used for storing a sequence of words. Usually malloced. */
82 struct wordlist *next;
86 /* Bits in scan_authfile return value */
87 #define NONWILD_SERVER 1
88 #define NONWILD_CLIENT 2
90 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
95 /* The name by which the peer authenticated itself to us. */
96 char peer_authname[MAXNAMELEN];
98 /* Records which authentication operations haven't completed yet. */
99 static int auth_pending[NUM_PPP];
101 /* Set if we have successfully called login() */
102 static int logged_in;
104 /* Set if we have run the /etc/ppp/auth-up script. */
105 static int did_authup;
107 /* List of addresses which the peer may use. */
108 static struct wordlist *addresses[NUM_PPP];
110 /* Number of network protocols which we have opened. */
111 static int num_np_open;
113 /* Number of network protocols which have come up. */
114 static int num_np_up;
116 /* Set if we got the contents of passwd[] from the pap-secrets file. */
117 static int passwd_from_file;
119 /* Bits in auth_pending[] */
120 #define PAP_WITHPEER 1
122 #define CHAP_WITHPEER 4
125 extern char *crypt __P((const char *, const char *));
127 /* Prototypes for procedures local to this file. */
129 static void network_phase __P((int));
130 static void check_idle __P((void *));
131 static void connect_time_expired __P((void *));
132 static int login __P((char *, char *, char **, int *));
133 static void logout __P((void));
134 static int null_login __P((int));
135 static int get_pap_passwd __P((char *));
136 static int have_pap_secret __P((void));
137 static int have_chap_secret __P((char *, char *, u_int32_t));
138 static int ip_addr_check __P((u_int32_t, struct wordlist *));
139 static int scan_authfile __P((FILE *, char *, char *, u_int32_t, char *,
140 struct wordlist **, char *));
141 static void free_wordlist __P((struct wordlist *));
142 static void auth_script __P((char *));
143 static void set_allowed_addrs __P((int, struct wordlist *));
145 static void callback_phase __P((int));
149 * An Open on LCP has requested a change from Dead to Establish phase.
150 * Do what's necessary to bring the physical layer up.
159 * LCP has terminated the link; go to the Dead phase and take the
160 * physical layer down.
163 link_terminated(unit)
166 if (phase == PHASE_DEAD)
171 syslog(LOG_NOTICE, "Connection terminated.");
175 * LCP has gone down; it will either die or try to re-establish.
182 struct protent *protp;
185 auth_script(_PATH_AUTHDOWN);
188 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
189 if (!protp->enabled_flag)
191 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
192 (*protp->lowerdown)(unit);
193 if (protp->protocol < 0xC000 && protp->close != NULL)
194 (*protp->close)(unit, "LCP down");
198 if (phase != PHASE_DEAD)
199 phase = PHASE_TERMINATE;
203 * The link is established.
204 * Proceed to the Dead, Authenticate or Network phase as appropriate.
207 link_established(unit)
211 lcp_options *wo = &lcp_wantoptions[unit];
212 lcp_options *go = &lcp_gotoptions[unit];
213 lcp_options *ho = &lcp_hisoptions[unit];
215 struct protent *protp;
218 * Tell higher-level protocols that LCP is up.
220 for (i = 0; (protp = protocols[i]) != NULL; ++i)
221 if (protp->protocol != PPP_LCP && protp->enabled_flag
222 && protp->lowerup != NULL)
223 (*protp->lowerup)(unit);
225 if (auth_required && !(go->neg_chap || go->neg_upap)) {
227 * We wanted the peer to authenticate itself, and it refused:
228 * treat it as though it authenticated with PAP using a username
229 * of "" and a password of "". If that's not OK, boot it out.
231 if (!wo->neg_upap || !null_login(unit)) {
232 syslog(LOG_WARNING, "peer refused to authenticate");
233 lcp_close(unit, "peer refused to authenticate");
238 phase = PHASE_AUTHENTICATE;
241 ChapAuthPeer(unit, our_name, go->chap_mdtype);
243 } else if (go->neg_upap) {
248 ChapAuthWithPeer(unit, user, ho->chap_mdtype);
249 auth |= CHAP_WITHPEER;
250 } else if (ho->neg_upap) {
251 if (passwd[0] == 0) {
252 passwd_from_file = 1;
253 if (!get_pap_passwd(passwd))
254 syslog(LOG_ERR, "No secret found for PAP login");
256 upap_authwithpeer(unit, user, passwd);
257 auth |= PAP_WITHPEER;
259 auth_pending[unit] = auth;
266 * Proceed to the network phase.
273 struct protent *protp;
274 lcp_options *go = &lcp_gotoptions[unit];
277 * If the peer had to authenticate, run the auth-up script now.
279 if ((go->neg_chap || go->neg_upap) && !did_authup) {
280 auth_script(_PATH_AUTHUP);
286 * If we negotiated callback, do it now.
289 phase = PHASE_CALLBACK;
290 (*cbcp_protent.open)(unit);
295 phase = PHASE_NETWORK;
298 set_filters(&pass_filter, &active_filter);
300 for (i = 0; (protp = protocols[i]) != NULL; ++i)
301 if (protp->protocol < 0xC000 && protp->enabled_flag
302 && protp->open != NULL) {
303 (*protp->open)(unit);
304 if (protp->protocol != PPP_CCP)
310 * The peer has failed to authenticate himself using `protocol'.
313 auth_peer_fail(unit, protocol)
317 * Authentication failure: take the link down
319 lcp_close(unit, "Authentication failed");
323 * The peer has been successfully authenticated using `protocol'.
326 auth_peer_success(unit, protocol, name, namelen)
341 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
347 * Save the authenticated name of the peer for later.
349 if (namelen > sizeof(peer_authname) - 1)
350 namelen = sizeof(peer_authname) - 1;
351 BCOPY(name, peer_authname, namelen);
352 peer_authname[namelen] = 0;
355 * If there is no more authentication still to be done,
356 * proceed to the network (or callback) phase.
358 if ((auth_pending[unit] &= ~bit) == 0)
363 * We have failed to authenticate ourselves to the peer using `protocol'.
366 auth_withpeer_fail(unit, protocol)
369 if (passwd_from_file)
370 BZERO(passwd, MAXSECRETLEN);
372 * We've failed to authenticate ourselves to our peer.
373 * He'll probably take the link down, and there's not much
374 * we can do except wait for that.
379 * We have successfully authenticated ourselves with the peer using `protocol'.
382 auth_withpeer_success(unit, protocol)
392 if (passwd_from_file)
393 BZERO(passwd, MAXSECRETLEN);
397 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
403 * If there is no more authentication still being done,
404 * proceed to the network (or callback) phase.
406 if ((auth_pending[unit] &= ~bit) == 0)
412 * np_up - a network protocol has come up.
418 if (num_np_up == 0 && idle_time_limit > 0) {
419 TIMEOUT(check_idle, NULL, idle_time_limit);
422 * Set a timeout to close the connection once the maximum
423 * connect time has expired.
426 TIMEOUT(connect_time_expired, 0, maxconnect);
432 * np_down - a network protocol has gone down.
438 if (--num_np_up == 0 && idle_time_limit > 0) {
439 UNTIMEOUT(check_idle, NULL);
444 * np_finished - a network protocol has finished using the link.
447 np_finished(unit, proto)
450 if (--num_np_open <= 0) {
451 /* no further use for the link: shut up shop. */
452 lcp_close(0, "No network protocols running");
457 * check_idle - check whether the link has been idle for long
458 * enough that we can shut it down.
464 struct ppp_idle idle;
467 if (!get_idle_time(0, &idle))
469 itime = MIN(idle.xmit_idle, idle.recv_idle);
470 if (itime >= idle_time_limit) {
471 /* link is idle: shut it down. */
472 syslog(LOG_INFO, "Terminating connection due to lack of activity.");
474 lcp_close(0, "Link inactive");
476 TIMEOUT(check_idle, NULL, idle_time_limit - itime);
481 * connect_time_expired - log a message and close the connection.
484 connect_time_expired(arg)
487 syslog(LOG_INFO, "Connect time expired");
488 lcp_close(0, "Connect time expired"); /* Close connection */
492 * auth_check_options - called to check authentication options.
497 lcp_options *wo = &lcp_wantoptions[0];
499 ipcp_options *ipwo = &ipcp_wantoptions[0];
502 /* Default our_name to hostname, and user to our_name */
503 if (our_name[0] == 0 || usehostname)
504 strcpy(our_name, hostname);
506 strcpy(user, our_name);
508 /* If authentication is required, ask peer for CHAP or PAP. */
509 if (auth_required && !wo->neg_chap && !wo->neg_upap) {
515 * Check whether we have appropriate secrets to use
516 * to authenticate the peer.
518 can_auth = wo->neg_upap && (uselogin || have_pap_secret());
519 if (!can_auth && wo->neg_chap) {
520 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
521 can_auth = have_chap_secret(remote_name, our_name, remote);
524 if (auth_required && !can_auth) {
525 option_error("peer authentication required but no suitable secret(s) found\n");
526 if (remote_name[0] == 0)
527 option_error("for authenticating any peer to us (%s)\n", our_name);
529 option_error("for authenticating peer %s to us (%s)\n",
530 remote_name, our_name);
535 * Check whether the user tried to override certain values
538 if (!auth_required && auth_req_info.priv > 0) {
539 if (!default_device && devnam_info.priv == 0) {
540 option_error("can't override device name when noauth option used");
543 if ((connector != NULL && connector_info.priv == 0)
544 || (disconnector != NULL && disconnector_info.priv == 0)
545 || (welcomer != NULL && welcomer_info.priv == 0)) {
546 option_error("can't override connect, disconnect or welcome");
547 option_error("option values when noauth option used");
554 * auth_reset - called when LCP is starting negotiations to recheck
555 * authentication options, i.e. whether we have appropriate secrets
556 * to use for authenticating ourselves and/or the peer.
562 lcp_options *go = &lcp_gotoptions[unit];
563 lcp_options *ao = &lcp_allowoptions[0];
564 ipcp_options *ipwo = &ipcp_wantoptions[0];
567 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
568 ao->neg_chap = !refuse_chap
569 && have_chap_secret(user, remote_name, (u_int32_t)0);
571 if (go->neg_upap && !uselogin && !have_pap_secret())
574 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
575 if (!have_chap_secret(remote_name, our_name, remote))
583 * check_passwd - Check the user name and passwd against the PAP secrets
584 * file. If requested, also check against the system password database,
585 * and login the user if OK.
588 * UPAP_AUTHNAK: Authentication failed.
589 * UPAP_AUTHACK: Authentication succeeded.
590 * In either case, msg points to an appropriate message.
593 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg, msglen)
605 struct wordlist *addrs;
607 ipcp_options *ipwo = &ipcp_wantoptions[unit];
608 char passwd[256], user[256];
609 char secret[MAXWORDLEN];
610 static int attempts = 0;
613 * Make copies of apasswd and auser, then null-terminate them.
615 BCOPY(apasswd, passwd, passwdlen);
616 passwd[passwdlen] = '\0';
617 BCOPY(auser, user, userlen);
618 user[userlen] = '\0';
622 * Open the file of pap secrets and scan for a suitable secret
623 * for authenticating this user.
625 filename = _PATH_UPAPFILE;
628 f = fopen(filename, "r");
630 syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
634 check_access(f, filename);
635 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
636 if (scan_authfile(f, user, our_name, remote,
637 secret, &addrs, filename) < 0
638 || (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
639 && strcmp(crypt(passwd, secret), secret) != 0)) {
640 syslog(LOG_WARNING, "PAP authentication failure for %s", user);
646 if (uselogin && ret == UPAP_AUTHACK) {
647 ret = login(user, passwd, msg, msglen);
648 if (ret == UPAP_AUTHNAK) {
649 syslog(LOG_WARNING, "PAP login failure for %s", user);
653 if (ret == UPAP_AUTHNAK) {
654 if (*msg == (char *) 0)
655 *msg = "Login incorrect";
656 *msglen = strlen(*msg);
658 * Frustrate passwd stealer programs.
659 * Allow 10 tries, but start backing off after 3 (stolen from login).
660 * On 10'th, drop the connection.
662 if (attempts++ >= 10) {
663 syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
664 attempts, devnam, user);
668 sleep((u_int) (attempts - 3) * 5);
670 free_wordlist(addrs);
673 attempts = 0; /* Reset count */
674 if (*msg == (char *) 0)
676 *msglen = strlen(*msg);
677 set_allowed_addrs(unit, addrs);
680 BZERO(passwd, sizeof(passwd));
681 BZERO(secret, sizeof(secret));
687 * This function is needed for PAM. However, it should not be called.
688 * If it is, return the error code.
692 static int pam_conv(int num_msg, const struct pam_message **msg,
693 struct pam_response **resp, void *appdata_ptr)
700 * login - Check the user name and password against the system
701 * password database, and login the user if OK.
704 * UPAP_AUTHNAK: Login failed.
705 * UPAP_AUTHACK: Login succeeded.
706 * In either case, msg points to an appropriate message.
710 login(user, passwd, msg, msglen)
719 struct pam_conv pam_conversation;
725 * Fill the pam_conversion structure
727 memset (&pam_conversation, '\0', sizeof (struct pam_conv));
728 pam_conversation.conv = &pam_conv;
730 pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
731 if (pam_error != PAM_SUCCESS) {
732 *msg = (char *) pam_strerror (pam_error);
736 * Define the fields for the credintial validation
738 (void) pam_set_item (pamh, PAM_AUTHTOK, passwd);
739 (void) pam_set_item (pamh, PAM_TTY, devnam);
743 pam_error = pam_authenticate (pamh, PAM_SILENT);
744 if (pam_error == PAM_SUCCESS)
745 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
747 *msg = (char *) pam_strerror (pam_error);
751 (void) pam_end (pamh, pam_error);
753 if (pam_error != PAM_SUCCESS)
756 * Use the non-PAM methods directly
758 #else /* #ifdef USE_PAM */
764 struct spwd *getspnam();
765 extern int isexpired (struct passwd *, struct spwd *); /* in libshadow.a */
770 return (UPAP_AUTHNAK);
774 spwd = getspnam(user);
777 /* check the age of the password entry */
778 if (isexpired(pw, spwd)) {
779 syslog(LOG_WARNING,"Expired password for %s",user);
780 return (UPAP_AUTHNAK);
782 pw->pw_passwd = spwd->sp_pwdp;
787 * If no passwd, don't let them login.
789 if (pw->pw_passwd == NULL || *pw->pw_passwd == '\0'
790 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
791 return (UPAP_AUTHNAK);
793 #endif /* #ifdef USE_PAM */
795 syslog(LOG_INFO, "user %s logged in", user);
798 * Write a wtmp entry for this user.
801 if (strncmp(tty, "/dev/", 5) == 0)
803 logwtmp(tty, user, remote_name); /* Add wtmp login entry */
806 return (UPAP_AUTHACK);
810 * logout - Logout the user.
818 if (strncmp(tty, "/dev/", 5) == 0)
820 logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
826 * null_login - Check if a username of "" and a password of "" are
827 * acceptable, and iff so, set the list of acceptable IP addresses
837 struct wordlist *addrs;
838 char secret[MAXWORDLEN];
841 * Open the file of pap secrets and scan for a suitable secret.
842 * We don't accept a wildcard client.
844 filename = _PATH_UPAPFILE;
846 f = fopen(filename, "r");
849 check_access(f, filename);
851 i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
852 ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
853 BZERO(secret, sizeof(secret));
856 set_allowed_addrs(unit, addrs);
858 free_wordlist(addrs);
866 * get_pap_passwd - get a password for authenticating ourselves with
867 * our peer using PAP. Returns 1 on success, 0 if no suitable password
871 get_pap_passwd(passwd)
876 struct wordlist *addrs;
877 char secret[MAXWORDLEN];
879 filename = _PATH_UPAPFILE;
881 f = fopen(filename, "r");
884 check_access(f, filename);
885 if (scan_authfile(f, user,
886 remote_name[0]? remote_name: NULL,
887 (u_int32_t)0, secret, NULL, filename) < 0)
889 if (passwd != NULL) {
890 strncpy(passwd, secret, MAXSECRETLEN);
891 passwd[MAXSECRETLEN-1] = 0;
893 BZERO(secret, sizeof(secret));
899 * have_pap_secret - check whether we have a PAP file with any
900 * secrets that we could possibly use for authenticating the peer.
908 ipcp_options *ipwo = &ipcp_wantoptions[0];
911 filename = _PATH_UPAPFILE;
912 f = fopen(filename, "r");
916 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
917 ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
927 * have_chap_secret - check whether we have a CHAP file with a
928 * secret that we could possibly use for authenticating `client'
929 * on `server'. Either can be the null string, meaning we don't
930 * know the identity yet.
933 have_chap_secret(client, server, remote)
942 filename = _PATH_CHAPFILE;
943 f = fopen(filename, "r");
949 else if (server[0] == 0)
952 ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
962 * get_secret - open the CHAP secret file and return the secret
963 * for authenticating the given client on the given server.
964 * (We could be either client or server).
967 get_secret(unit, client, server, secret, secret_len, save_addrs)
978 struct wordlist *addrs;
979 char secbuf[MAXWORDLEN];
981 filename = _PATH_CHAPFILE;
985 f = fopen(filename, "r");
987 syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
990 check_access(f, filename);
992 ret = scan_authfile(f, client, server, (u_int32_t)0,
993 secbuf, &addrs, filename);
999 set_allowed_addrs(unit, addrs);
1001 len = strlen(secbuf);
1002 if (len > MAXSECRETLEN) {
1003 syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
1006 BCOPY(secbuf, secret, len);
1007 BZERO(secbuf, sizeof(secbuf));
1014 * set_allowed_addrs() - set the list of allowed addresses.
1017 set_allowed_addrs(unit, addrs)
1019 struct wordlist *addrs;
1021 if (addresses[unit] != NULL)
1022 free_wordlist(addresses[unit]);
1023 addresses[unit] = addrs;
1026 * If there's only one authorized address we might as well
1027 * ask our peer for that one right away
1029 if (addrs != NULL && addrs->next == NULL) {
1030 char *p = addrs->word;
1031 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1035 if (wo->hisaddr == 0 && *p != '!' && *p != '-'
1036 && strchr(p, '/') == NULL) {
1037 hp = gethostbyname(p);
1038 if (hp != NULL && hp->h_addrtype == AF_INET)
1039 a = *(u_int32_t *)hp->h_addr;
1042 if (a != (u_int32_t) -1)
1049 * auth_ip_addr - check whether the peer is authorized to use
1050 * a given IP address. Returns 1 if authorized, 0 otherwise.
1053 auth_ip_addr(unit, addr)
1057 return ip_addr_check(addr, addresses[unit]);
1061 ip_addr_check(addr, addrs)
1063 struct wordlist *addrs;
1065 u_int32_t a, mask, ah;
1067 char *ptr_word, *ptr_mask;
1071 /* don't allow loopback or multicast address */
1072 if (bad_ip_adrs(addr))
1076 return !auth_required; /* no addresses authorized */
1078 for (; addrs != NULL; addrs = addrs->next) {
1079 /* "-" means no addresses authorized, "*" means any address allowed */
1080 ptr_word = addrs->word;
1081 if (strcmp(ptr_word, "-") == 0)
1083 if (strcmp(ptr_word, "*") == 0)
1087 if (*ptr_word == '!') {
1092 mask = ~ (u_int32_t) 0;
1093 ptr_mask = strchr (ptr_word, '/');
1094 if (ptr_mask != NULL) {
1097 bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
1098 if (bit_count <= 0 || bit_count > 32) {
1099 syslog (LOG_WARNING,
1100 "invalid address length %s in auth. address list",
1105 mask <<= 32 - bit_count;
1108 hp = gethostbyname(ptr_word);
1109 if (hp != NULL && hp->h_addrtype == AF_INET) {
1110 a = *(u_int32_t *)hp->h_addr;
1112 np = getnetbyname (ptr_word);
1113 if (np != NULL && np->n_addrtype == AF_INET) {
1114 a = htonl (*(u_int32_t *)np->n_net);
1115 if (ptr_mask == NULL) {
1116 /* calculate appropriate mask for net */
1119 mask = IN_CLASSA_NET;
1120 else if (IN_CLASSB(ah))
1121 mask = IN_CLASSB_NET;
1122 else if (IN_CLASSC(ah))
1123 mask = IN_CLASSC_NET;
1126 a = inet_addr (ptr_word);
1130 if (ptr_mask != NULL)
1133 if (a == (u_int32_t)-1L)
1134 syslog (LOG_WARNING,
1135 "unknown host %s in auth. address list",
1138 /* Here a and addr are in network byte order,
1139 and mask is in host order. */
1140 if (((addr ^ a) & htonl(mask)) == 0)
1143 return 0; /* not in list => can't have it */
1147 * bad_ip_adrs - return 1 if the IP address is one we don't want
1148 * to use, such as an address in the loopback net or a multicast address.
1149 * addr is in network byte order.
1156 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1157 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1161 * check_access - complain if a secret file has too-liberal permissions.
1164 check_access(f, filename)
1170 if (fstat(fileno(f), &sbuf) < 0) {
1171 syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
1172 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
1173 syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
1179 * scan_authfile - Scan an authorization file for a secret suitable
1180 * for authenticating `client' on `server'. The return value is -1
1181 * if no secret is found, otherwise >= 0. The return value has
1182 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
1183 * NONWILD_SERVER set if the secret didn't have "*" for the server.
1184 * Any following words on the line (i.e. address authorization
1185 * info) are placed in a wordlist and returned in *addrs.
1188 scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
1194 struct wordlist **addrs;
1198 int got_flag, best_flag;
1200 struct wordlist *ap, *addr_list, *alist, *alast;
1201 char word[MAXWORDLEN];
1202 char atfile[MAXWORDLEN];
1203 char lsecret[MAXWORDLEN];
1208 if (!getword(f, word, &newline, filename))
1209 return -1; /* file is empty??? */
1214 * Skip until we find a word at the start of a line.
1216 while (!newline && getword(f, word, &newline, filename))
1219 break; /* got to end of file */
1222 * Got a client - check if it's a match or a wildcard.
1225 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
1230 got_flag = NONWILD_CLIENT;
1233 * Now get a server and check if it matches.
1235 if (!getword(f, word, &newline, filename))
1239 if (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
1242 got_flag |= NONWILD_SERVER;
1245 * Got some sort of a match - see if it's better than what
1248 if (got_flag <= best_flag)
1254 if (!getword(f, word, &newline, filename))
1260 * Special syntax: @filename means read secret from file.
1262 if (word[0] == '@') {
1263 strcpy(atfile, word+1);
1264 if ((sf = fopen(atfile, "r")) == NULL) {
1265 syslog(LOG_WARNING, "can't open indirect secret file %s",
1269 check_access(sf, atfile);
1270 if (!getword(sf, word, &xxx, atfile)) {
1271 syslog(LOG_WARNING, "no secret in indirect secret file %s",
1279 strcpy(lsecret, word);
1282 * Now read address authorization info and make a wordlist.
1284 alist = alast = NULL;
1286 if (!getword(f, word, &newline, filename) || newline)
1288 ap = (struct wordlist *) malloc(sizeof(struct wordlist)
1291 novm("authorized addresses");
1293 strcpy(ap->word, word);
1302 * Check if the given IP address is allowed by the wordlist.
1304 if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
1305 free_wordlist(alist);
1310 * This is the best so far; remember it.
1312 best_flag = got_flag;
1314 free_wordlist(addr_list);
1317 strcpy(secret, lsecret);
1325 else if (addr_list != NULL)
1326 free_wordlist(addr_list);
1332 * free_wordlist - release memory allocated for a wordlist.
1336 struct wordlist *wp;
1338 struct wordlist *next;
1340 while (wp != NULL) {
1348 * auth_script - execute a script with arguments
1349 * interface-name peer-name real-user tty speed
1361 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
1362 user_name = pw->pw_name;
1364 sprintf(struid, "%d", getuid());
1367 sprintf(strspeed, "%d", baud_rate);
1371 argv[2] = peer_authname;
1372 argv[3] = user_name;
1377 run_program(script, argv, 0);