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 1.33 1997/11/27 06:07:29 paulus Exp $";
46 #include <sys/types.h>
48 #include <sys/socket.h>
53 #include <netinet/in.h>
54 #include <arpa/inet.h>
57 #include <security/pam_appl.h>
58 #include <security/pam_modules.h>
64 #include <shadow/pwauth.h>
67 #define PW_PPP PW_LOGIN
80 #include "pathnames.h"
82 /* Used for storing a sequence of words. Usually malloced. */
84 struct wordlist *next;
88 /* Bits in scan_authfile return value */
89 #define NONWILD_SERVER 1
90 #define NONWILD_CLIENT 2
92 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
97 /* The name by which the peer authenticated itself to us. */
98 char peer_authname[MAXNAMELEN];
100 /* Records which authentication operations haven't completed yet. */
101 static int auth_pending[NUM_PPP];
103 /* Set if we have successfully called login() */
104 static int logged_in;
106 /* Set if we have run the /etc/ppp/auth-up script. */
107 static int did_authup;
109 /* List of addresses which the peer may use. */
110 static struct wordlist *addresses[NUM_PPP];
112 /* Number of network protocols which we have opened. */
113 static int num_np_open;
115 /* Number of network protocols which have come up. */
116 static int num_np_up;
118 /* Set if we got the contents of passwd[] from the pap-secrets file. */
119 static int passwd_from_file;
121 /* Bits in auth_pending[] */
122 #define PAP_WITHPEER 1
124 #define CHAP_WITHPEER 4
127 extern char *crypt __P((const char *, const char *));
129 /* Prototypes for procedures local to this file. */
131 static void network_phase __P((int));
132 static void check_idle __P((void *));
133 static void connect_time_expired __P((void *));
134 static int login __P((char *, char *, char **, int *));
135 static void logout __P((void));
136 static int null_login __P((int));
137 static int get_pap_passwd __P((char *));
138 static int have_pap_secret __P((void));
139 static int have_chap_secret __P((char *, char *, u_int32_t));
140 static int ip_addr_check __P((u_int32_t, struct wordlist *));
141 static int scan_authfile __P((FILE *, char *, char *, u_int32_t, char *,
142 struct wordlist **, char *));
143 static void free_wordlist __P((struct wordlist *));
144 static void auth_script __P((char *));
145 static void set_allowed_addrs __P((int, struct wordlist *));
148 * An Open on LCP has requested a change from Dead to Establish phase.
149 * Do what's necessary to bring the physical layer up.
158 * LCP has terminated the link; go to the Dead phase and take the
159 * physical layer down.
162 link_terminated(unit)
165 if (phase == PHASE_DEAD)
170 syslog(LOG_NOTICE, "Connection terminated.");
174 * LCP has gone down; it will either die or try to re-establish.
181 struct protent *protp;
184 auth_script(_PATH_AUTHDOWN);
187 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
188 if (!protp->enabled_flag)
190 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
191 (*protp->lowerdown)(unit);
192 if (protp->protocol < 0xC000 && protp->close != NULL)
193 (*protp->close)(unit, "LCP down");
197 if (phase != PHASE_DEAD)
198 phase = PHASE_TERMINATE;
202 * The link is established.
203 * Proceed to the Dead, Authenticate or Network phase as appropriate.
206 link_established(unit)
210 lcp_options *wo = &lcp_wantoptions[unit];
211 lcp_options *go = &lcp_gotoptions[unit];
212 lcp_options *ho = &lcp_hisoptions[unit];
214 struct protent *protp;
217 * Tell higher-level protocols that LCP is up.
219 for (i = 0; (protp = protocols[i]) != NULL; ++i)
220 if (protp->protocol != PPP_LCP && protp->enabled_flag
221 && protp->lowerup != NULL)
222 (*protp->lowerup)(unit);
224 if (auth_required && !(go->neg_chap || go->neg_upap)) {
226 * We wanted the peer to authenticate itself, and it refused:
227 * treat it as though it authenticated with PAP using a username
228 * of "" and a password of "". If that's not OK, boot it out.
230 if (!wo->neg_upap || !null_login(unit)) {
231 syslog(LOG_WARNING, "peer refused to authenticate");
232 lcp_close(unit, "peer refused to authenticate");
237 phase = PHASE_AUTHENTICATE;
240 ChapAuthPeer(unit, our_name, go->chap_mdtype);
242 } else if (go->neg_upap) {
247 ChapAuthWithPeer(unit, user, ho->chap_mdtype);
248 auth |= CHAP_WITHPEER;
249 } else if (ho->neg_upap) {
250 if (passwd[0] == 0) {
251 passwd_from_file = 1;
252 if (!get_pap_passwd(passwd))
253 syslog(LOG_ERR, "No secret found for PAP login");
255 upap_authwithpeer(unit, user, passwd);
256 auth |= PAP_WITHPEER;
258 auth_pending[unit] = auth;
265 * Proceed to the network phase.
272 struct protent *protp;
273 lcp_options *go = &lcp_gotoptions[unit];
276 * If the peer had to authenticate, run the auth-up script now.
278 if ((go->neg_chap || go->neg_upap) && !did_authup) {
279 auth_script(_PATH_AUTHUP);
285 * If we negotiated callback, do it now.
288 phase = PHASE_CALLBACK;
289 (*cbcp_protent.open)(unit);
294 phase = PHASE_NETWORK;
297 set_filters(&pass_filter, &active_filter);
299 for (i = 0; (protp = protocols[i]) != NULL; ++i)
300 if (protp->protocol < 0xC000 && protp->enabled_flag
301 && protp->open != NULL) {
302 (*protp->open)(unit);
303 if (protp->protocol != PPP_CCP)
307 if (num_np_open == 0)
309 lcp_close(0, "No network protocols running");
313 * The peer has failed to authenticate himself using `protocol'.
316 auth_peer_fail(unit, protocol)
320 * Authentication failure: take the link down
322 lcp_close(unit, "Authentication failed");
326 * The peer has been successfully authenticated using `protocol'.
329 auth_peer_success(unit, protocol, name, namelen)
344 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
350 * Save the authenticated name of the peer for later.
352 if (namelen > sizeof(peer_authname) - 1)
353 namelen = sizeof(peer_authname) - 1;
354 BCOPY(name, peer_authname, namelen);
355 peer_authname[namelen] = 0;
358 * If there is no more authentication still to be done,
359 * proceed to the network (or callback) phase.
361 if ((auth_pending[unit] &= ~bit) == 0)
366 * We have failed to authenticate ourselves to the peer using `protocol'.
369 auth_withpeer_fail(unit, protocol)
372 if (passwd_from_file)
373 BZERO(passwd, MAXSECRETLEN);
375 * We've failed to authenticate ourselves to our peer.
376 * He'll probably take the link down, and there's not much
377 * we can do except wait for that.
382 * We have successfully authenticated ourselves with the peer using `protocol'.
385 auth_withpeer_success(unit, protocol)
395 if (passwd_from_file)
396 BZERO(passwd, MAXSECRETLEN);
400 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
406 * If there is no more authentication still being done,
407 * proceed to the network (or callback) phase.
409 if ((auth_pending[unit] &= ~bit) == 0)
415 * np_up - a network protocol has come up.
421 if (num_np_up == 0) {
423 * At this point we consider that the link has come up successfully.
427 if (idle_time_limit > 0)
428 TIMEOUT(check_idle, NULL, idle_time_limit);
431 * Set a timeout to close the connection once the maximum
432 * connect time has expired.
435 TIMEOUT(connect_time_expired, 0, maxconnect);
441 * np_down - a network protocol has gone down.
447 if (--num_np_up == 0 && idle_time_limit > 0) {
448 UNTIMEOUT(check_idle, NULL);
453 * np_finished - a network protocol has finished using the link.
456 np_finished(unit, proto)
459 if (--num_np_open <= 0) {
460 /* no further use for the link: shut up shop. */
461 lcp_close(0, "No network protocols running");
466 * check_idle - check whether the link has been idle for long
467 * enough that we can shut it down.
473 struct ppp_idle idle;
476 if (!get_idle_time(0, &idle))
478 itime = MIN(idle.xmit_idle, idle.recv_idle);
479 if (itime >= idle_time_limit) {
480 /* link is idle: shut it down. */
481 syslog(LOG_INFO, "Terminating connection due to lack of activity.");
482 lcp_close(0, "Link inactive");
484 TIMEOUT(check_idle, NULL, idle_time_limit - itime);
489 * connect_time_expired - log a message and close the connection.
492 connect_time_expired(arg)
495 syslog(LOG_INFO, "Connect time expired");
496 lcp_close(0, "Connect time expired"); /* Close connection */
500 * auth_check_options - called to check authentication options.
505 lcp_options *wo = &lcp_wantoptions[0];
507 ipcp_options *ipwo = &ipcp_wantoptions[0];
510 /* Default our_name to hostname, and user to our_name */
511 if (our_name[0] == 0 || usehostname)
512 strcpy(our_name, hostname);
514 strcpy(user, our_name);
516 /* If authentication is required, ask peer for CHAP or PAP. */
517 if (auth_required && !wo->neg_chap && !wo->neg_upap) {
523 * Check whether we have appropriate secrets to use
524 * to authenticate the peer.
526 can_auth = wo->neg_upap && (uselogin || have_pap_secret());
527 if (!can_auth && wo->neg_chap) {
528 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
529 can_auth = have_chap_secret(remote_name, our_name, remote);
532 if (auth_required && !can_auth) {
533 option_error("peer authentication required but no suitable secret(s) found\n");
534 if (remote_name[0] == 0)
535 option_error("for authenticating any peer to us (%s)\n", our_name);
537 option_error("for authenticating peer %s to us (%s)\n",
538 remote_name, our_name);
543 * Check whether the user tried to override certain values
546 if (!auth_required && auth_req_info.priv > 0) {
547 if (!default_device && devnam_info.priv == 0) {
548 option_error("can't override device name when noauth option used");
551 if ((connector != NULL && connector_info.priv == 0)
552 || (disconnector != NULL && disconnector_info.priv == 0)
553 || (welcomer != NULL && welcomer_info.priv == 0)) {
554 option_error("can't override connect, disconnect or welcome");
555 option_error("option values when noauth option used");
562 * auth_reset - called when LCP is starting negotiations to recheck
563 * authentication options, i.e. whether we have appropriate secrets
564 * to use for authenticating ourselves and/or the peer.
570 lcp_options *go = &lcp_gotoptions[unit];
571 lcp_options *ao = &lcp_allowoptions[0];
572 ipcp_options *ipwo = &ipcp_wantoptions[0];
575 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
576 ao->neg_chap = !refuse_chap
577 && have_chap_secret(user, remote_name, (u_int32_t)0);
579 if (go->neg_upap && !uselogin && !have_pap_secret())
582 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
583 if (!have_chap_secret(remote_name, our_name, remote))
591 * check_passwd - Check the user name and passwd against the PAP secrets
592 * file. If requested, also check against the system password database,
593 * and login the user if OK.
596 * UPAP_AUTHNAK: Authentication failed.
597 * UPAP_AUTHACK: Authentication succeeded.
598 * In either case, msg points to an appropriate message.
601 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg, msglen)
613 struct wordlist *addrs;
615 ipcp_options *ipwo = &ipcp_wantoptions[unit];
616 char passwd[256], user[256];
617 char secret[MAXWORDLEN];
618 static int attempts = 0;
621 * Make copies of apasswd and auser, then null-terminate them.
623 BCOPY(apasswd, passwd, passwdlen);
624 passwd[passwdlen] = '\0';
625 BCOPY(auser, user, userlen);
626 user[userlen] = '\0';
630 * Open the file of pap secrets and scan for a suitable secret
631 * for authenticating this user.
633 filename = _PATH_UPAPFILE;
636 f = fopen(filename, "r");
638 syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
642 check_access(f, filename);
643 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
644 if (scan_authfile(f, user, our_name, remote,
645 secret, &addrs, filename) < 0
646 || (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
647 && strcmp(crypt(passwd, secret), secret) != 0)) {
648 syslog(LOG_WARNING, "PAP authentication failure for %s", user);
654 if (uselogin && ret == UPAP_AUTHACK) {
655 ret = login(user, passwd, msg, msglen);
656 if (ret == UPAP_AUTHNAK) {
657 syslog(LOG_WARNING, "PAP login failure for %s", user);
661 if (ret == UPAP_AUTHNAK) {
662 if (*msg == (char *) 0)
663 *msg = "Login incorrect";
664 *msglen = strlen(*msg);
666 * Frustrate passwd stealer programs.
667 * Allow 10 tries, but start backing off after 3 (stolen from login).
668 * On 10'th, drop the connection.
670 if (attempts++ >= 10) {
671 syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
672 attempts, devnam, user);
676 sleep((u_int) (attempts - 3) * 5);
678 free_wordlist(addrs);
681 attempts = 0; /* Reset count */
682 if (*msg == (char *) 0)
684 *msglen = strlen(*msg);
685 set_allowed_addrs(unit, addrs);
688 BZERO(passwd, sizeof(passwd));
689 BZERO(secret, sizeof(secret));
695 * This function is needed for PAM. However, it should not be called.
696 * If it is, return the error code.
700 static int pam_conv(int num_msg, const struct pam_message **msg,
701 struct pam_response **resp, void *appdata_ptr)
708 * login - Check the user name and password against the system
709 * password database, and login the user if OK.
712 * UPAP_AUTHNAK: Login failed.
713 * UPAP_AUTHACK: Login succeeded.
714 * In either case, msg points to an appropriate message.
718 login(user, passwd, msg, msglen)
727 struct pam_conv pam_conversation;
733 * Fill the pam_conversion structure
735 memset (&pam_conversation, '\0', sizeof (struct pam_conv));
736 pam_conversation.conv = &pam_conv;
738 pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
739 if (pam_error != PAM_SUCCESS) {
740 *msg = (char *) pam_strerror (pam_error);
744 * Define the fields for the credintial validation
746 (void) pam_set_item (pamh, PAM_AUTHTOK, passwd);
747 (void) pam_set_item (pamh, PAM_TTY, devnam);
751 pam_error = pam_authenticate (pamh, PAM_SILENT);
752 if (pam_error == PAM_SUCCESS)
753 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
755 *msg = (char *) pam_strerror (pam_error);
759 (void) pam_end (pamh, pam_error);
761 if (pam_error != PAM_SUCCESS)
764 * Use the non-PAM methods directly
766 #else /* #ifdef USE_PAM */
772 struct spwd *getspnam();
773 extern int isexpired (struct passwd *, struct spwd *); /* in libshadow.a */
778 return (UPAP_AUTHNAK);
782 spwd = getspnam(user);
785 /* check the age of the password entry */
786 if (isexpired(pw, spwd)) {
787 syslog(LOG_WARNING,"Expired password for %s",user);
788 return (UPAP_AUTHNAK);
790 pw->pw_passwd = spwd->sp_pwdp;
795 * If no passwd, don't let them login.
797 if (pw->pw_passwd == NULL || *pw->pw_passwd == '\0'
798 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
799 return (UPAP_AUTHNAK);
801 #endif /* #ifdef USE_PAM */
803 syslog(LOG_INFO, "user %s logged in", user);
806 * Write a wtmp entry for this user.
809 if (strncmp(tty, "/dev/", 5) == 0)
811 logwtmp(tty, user, remote_name); /* Add wtmp login entry */
818 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
819 (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
820 memset((void *)&ll, 0, sizeof(ll));
821 (void)time(&ll.ll_time);
822 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
823 (void)write(fd, (char *)&ll, sizeof(ll));
830 return (UPAP_AUTHACK);
834 * logout - Logout the user.
842 if (strncmp(tty, "/dev/", 5) == 0)
844 logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
850 * null_login - Check if a username of "" and a password of "" are
851 * acceptable, and iff so, set the list of acceptable IP addresses
861 struct wordlist *addrs;
862 char secret[MAXWORDLEN];
865 * Open the file of pap secrets and scan for a suitable secret.
866 * We don't accept a wildcard client.
868 filename = _PATH_UPAPFILE;
870 f = fopen(filename, "r");
873 check_access(f, filename);
875 i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
876 ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
877 BZERO(secret, sizeof(secret));
880 set_allowed_addrs(unit, addrs);
882 free_wordlist(addrs);
890 * get_pap_passwd - get a password for authenticating ourselves with
891 * our peer using PAP. Returns 1 on success, 0 if no suitable password
895 get_pap_passwd(passwd)
901 struct wordlist *addrs;
902 char secret[MAXWORDLEN];
904 filename = _PATH_UPAPFILE;
906 f = fopen(filename, "r");
909 check_access(f, filename);
910 ret = scan_authfile(f, user,
911 remote_name[0]? remote_name: NULL,
912 (u_int32_t)0, secret, NULL, filename);
916 if (passwd != NULL) {
917 strncpy(passwd, secret, MAXSECRETLEN);
918 passwd[MAXSECRETLEN-1] = 0;
920 BZERO(secret, sizeof(secret));
926 * have_pap_secret - check whether we have a PAP file with any
927 * secrets that we could possibly use for authenticating the peer.
935 ipcp_options *ipwo = &ipcp_wantoptions[0];
938 filename = _PATH_UPAPFILE;
939 f = fopen(filename, "r");
943 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
944 ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
954 * have_chap_secret - check whether we have a CHAP file with a
955 * secret that we could possibly use for authenticating `client'
956 * on `server'. Either can be the null string, meaning we don't
957 * know the identity yet.
960 have_chap_secret(client, server, remote)
969 filename = _PATH_CHAPFILE;
970 f = fopen(filename, "r");
976 else if (server[0] == 0)
979 ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
989 * get_secret - open the CHAP secret file and return the secret
990 * for authenticating the given client on the given server.
991 * (We could be either client or server).
994 get_secret(unit, client, server, secret, secret_len, save_addrs)
1005 struct wordlist *addrs;
1006 char secbuf[MAXWORDLEN];
1008 filename = _PATH_CHAPFILE;
1012 f = fopen(filename, "r");
1014 syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
1017 check_access(f, filename);
1019 ret = scan_authfile(f, client, server, (u_int32_t)0,
1020 secbuf, &addrs, filename);
1026 set_allowed_addrs(unit, addrs);
1028 len = strlen(secbuf);
1029 if (len > MAXSECRETLEN) {
1030 syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
1033 BCOPY(secbuf, secret, len);
1034 BZERO(secbuf, sizeof(secbuf));
1041 * set_allowed_addrs() - set the list of allowed addresses.
1044 set_allowed_addrs(unit, addrs)
1046 struct wordlist *addrs;
1048 if (addresses[unit] != NULL)
1049 free_wordlist(addresses[unit]);
1050 addresses[unit] = addrs;
1053 * If there's only one authorized address we might as well
1054 * ask our peer for that one right away
1056 if (addrs != NULL && addrs->next == NULL) {
1057 char *p = addrs->word;
1058 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1062 if (wo->hisaddr == 0 && *p != '!' && *p != '-'
1063 && strchr(p, '/') == NULL) {
1064 hp = gethostbyname(p);
1065 if (hp != NULL && hp->h_addrtype == AF_INET)
1066 a = *(u_int32_t *)hp->h_addr;
1069 if (a != (u_int32_t) -1)
1076 * auth_ip_addr - check whether the peer is authorized to use
1077 * a given IP address. Returns 1 if authorized, 0 otherwise.
1080 auth_ip_addr(unit, addr)
1084 return ip_addr_check(addr, addresses[unit]);
1088 ip_addr_check(addr, addrs)
1090 struct wordlist *addrs;
1092 u_int32_t a, mask, ah;
1094 char *ptr_word, *ptr_mask;
1098 /* don't allow loopback or multicast address */
1099 if (bad_ip_adrs(addr))
1103 return !auth_required; /* no addresses authorized */
1105 for (; addrs != NULL; addrs = addrs->next) {
1106 /* "-" means no addresses authorized, "*" means any address allowed */
1107 ptr_word = addrs->word;
1108 if (strcmp(ptr_word, "-") == 0)
1110 if (strcmp(ptr_word, "*") == 0)
1114 if (*ptr_word == '!') {
1119 mask = ~ (u_int32_t) 0;
1120 ptr_mask = strchr (ptr_word, '/');
1121 if (ptr_mask != NULL) {
1124 bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
1125 if (bit_count <= 0 || bit_count > 32) {
1126 syslog (LOG_WARNING,
1127 "invalid address length %s in auth. address list",
1132 mask <<= 32 - bit_count;
1135 hp = gethostbyname(ptr_word);
1136 if (hp != NULL && hp->h_addrtype == AF_INET) {
1137 a = *(u_int32_t *)hp->h_addr;
1139 np = getnetbyname (ptr_word);
1140 if (np != NULL && np->n_addrtype == AF_INET) {
1141 a = htonl (*(u_int32_t *)np->n_net);
1142 if (ptr_mask == NULL) {
1143 /* calculate appropriate mask for net */
1146 mask = IN_CLASSA_NET;
1147 else if (IN_CLASSB(ah))
1148 mask = IN_CLASSB_NET;
1149 else if (IN_CLASSC(ah))
1150 mask = IN_CLASSC_NET;
1153 a = inet_addr (ptr_word);
1157 if (ptr_mask != NULL)
1160 if (a == (u_int32_t)-1L)
1161 syslog (LOG_WARNING,
1162 "unknown host %s in auth. address list",
1165 /* Here a and addr are in network byte order,
1166 and mask is in host order. */
1167 if (((addr ^ a) & htonl(mask)) == 0)
1170 return 0; /* not in list => can't have it */
1174 * bad_ip_adrs - return 1 if the IP address is one we don't want
1175 * to use, such as an address in the loopback net or a multicast address.
1176 * addr is in network byte order.
1183 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1184 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1188 * check_access - complain if a secret file has too-liberal permissions.
1191 check_access(f, filename)
1197 if (fstat(fileno(f), &sbuf) < 0) {
1198 syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
1199 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
1200 syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
1206 * scan_authfile - Scan an authorization file for a secret suitable
1207 * for authenticating `client' on `server'. The return value is -1
1208 * if no secret is found, otherwise >= 0. The return value has
1209 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
1210 * NONWILD_SERVER set if the secret didn't have "*" for the server.
1211 * Any following words on the line (i.e. address authorization
1212 * info) are placed in a wordlist and returned in *addrs.
1215 scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
1221 struct wordlist **addrs;
1225 int got_flag, best_flag;
1227 struct wordlist *ap, *addr_list, *alist, *alast;
1228 char word[MAXWORDLEN];
1229 char atfile[MAXWORDLEN];
1230 char lsecret[MAXWORDLEN];
1235 if (!getword(f, word, &newline, filename))
1236 return -1; /* file is empty??? */
1241 * Skip until we find a word at the start of a line.
1243 while (!newline && getword(f, word, &newline, filename))
1246 break; /* got to end of file */
1249 * Got a client - check if it's a match or a wildcard.
1252 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
1257 got_flag = NONWILD_CLIENT;
1260 * Now get a server and check if it matches.
1262 if (!getword(f, word, &newline, filename))
1266 if (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
1269 got_flag |= NONWILD_SERVER;
1272 * Got some sort of a match - see if it's better than what
1275 if (got_flag <= best_flag)
1281 if (!getword(f, word, &newline, filename))
1287 * Special syntax: @filename means read secret from file.
1289 if (word[0] == '@') {
1290 strcpy(atfile, word+1);
1291 if ((sf = fopen(atfile, "r")) == NULL) {
1292 syslog(LOG_WARNING, "can't open indirect secret file %s",
1296 check_access(sf, atfile);
1297 if (!getword(sf, word, &xxx, atfile)) {
1298 syslog(LOG_WARNING, "no secret in indirect secret file %s",
1306 strcpy(lsecret, word);
1309 * Now read address authorization info and make a wordlist.
1311 alist = alast = NULL;
1313 if (!getword(f, word, &newline, filename) || newline)
1315 ap = (struct wordlist *) malloc(sizeof(struct wordlist)
1318 novm("authorized addresses");
1320 strcpy(ap->word, word);
1329 * Check if the given IP address is allowed by the wordlist.
1331 if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
1332 free_wordlist(alist);
1337 * This is the best so far; remember it.
1339 best_flag = got_flag;
1341 free_wordlist(addr_list);
1344 strcpy(secret, lsecret);
1352 else if (addr_list != NULL)
1353 free_wordlist(addr_list);
1359 * free_wordlist - release memory allocated for a wordlist.
1363 struct wordlist *wp;
1365 struct wordlist *next;
1367 while (wp != NULL) {
1375 * auth_script - execute a script with arguments
1376 * interface-name peer-name real-user tty speed
1388 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
1389 user_name = pw->pw_name;
1391 sprintf(struid, "%d", getuid());
1394 sprintf(strspeed, "%d", baud_rate);
1398 argv[2] = peer_authname;
1399 argv[3] = user_name;
1404 run_program(script, argv, 0);