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 1.35 1997/11/27 06:49:15 paulus 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>
60 #include <security/pam_appl.h>
61 #include <security/pam_modules.h>
67 #include <shadow/pwauth.h>
70 #define PW_PPP PW_LOGIN
83 #include "pathnames.h"
85 /* Used for storing a sequence of words. Usually malloced. */
87 struct wordlist *next;
91 /* Bits in scan_authfile return value */
92 #define NONWILD_SERVER 1
93 #define NONWILD_CLIENT 2
95 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
100 /* The name by which the peer authenticated itself to us. */
101 char peer_authname[MAXNAMELEN];
103 /* Records which authentication operations haven't completed yet. */
104 static int auth_pending[NUM_PPP];
106 /* Set if we have successfully called plogin() */
107 static int logged_in;
109 /* Set if we have run the /etc/ppp/auth-up script. */
110 static int did_authup;
112 /* List of addresses which the peer may use. */
113 static struct wordlist *addresses[NUM_PPP];
115 /* Number of network protocols which we have opened. */
116 static int num_np_open;
118 /* Number of network protocols which have come up. */
119 static int num_np_up;
121 /* Set if we got the contents of passwd[] from the pap-secrets file. */
122 static int passwd_from_file;
124 /* Bits in auth_pending[] */
125 #define PAP_WITHPEER 1
127 #define CHAP_WITHPEER 4
130 extern char *crypt __P((const char *, const char *));
132 /* Prototypes for procedures local to this file. */
134 static void network_phase __P((int));
135 static void check_idle __P((void *));
136 static void connect_time_expired __P((void *));
137 static int plogin __P((char *, char *, char **, int *));
138 static void plogout __P((void));
139 static int null_login __P((int));
140 static int get_pap_passwd __P((char *));
141 static int have_pap_secret __P((void));
142 static int have_chap_secret __P((char *, char *, u_int32_t));
143 static int ip_addr_check __P((u_int32_t, struct wordlist *));
144 static int scan_authfile __P((FILE *, char *, char *, u_int32_t, char *,
145 struct wordlist **, char *));
146 static void free_wordlist __P((struct wordlist *));
147 static void auth_script __P((char *));
148 static void set_allowed_addrs __P((int, struct wordlist *));
151 * An Open on LCP has requested a change from Dead to Establish phase.
152 * Do what's necessary to bring the physical layer up.
161 * LCP has terminated the link; go to the Dead phase and take the
162 * physical layer down.
165 link_terminated(unit)
168 if (phase == PHASE_DEAD)
173 syslog(LOG_NOTICE, "Connection terminated.");
177 * LCP has gone down; it will either die or try to re-establish.
184 struct protent *protp;
187 auth_script(_PATH_AUTHDOWN);
190 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
191 if (!protp->enabled_flag)
193 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
194 (*protp->lowerdown)(unit);
195 if (protp->protocol < 0xC000 && protp->close != NULL)
196 (*protp->close)(unit, "LCP down");
200 if (phase != PHASE_DEAD)
201 phase = PHASE_TERMINATE;
205 * The link is established.
206 * Proceed to the Dead, Authenticate or Network phase as appropriate.
209 link_established(unit)
213 lcp_options *wo = &lcp_wantoptions[unit];
214 lcp_options *go = &lcp_gotoptions[unit];
215 lcp_options *ho = &lcp_hisoptions[unit];
217 struct protent *protp;
220 * Tell higher-level protocols that LCP is up.
222 for (i = 0; (protp = protocols[i]) != NULL; ++i)
223 if (protp->protocol != PPP_LCP && protp->enabled_flag
224 && protp->lowerup != NULL)
225 (*protp->lowerup)(unit);
227 if (auth_required && !(go->neg_chap || go->neg_upap)) {
229 * We wanted the peer to authenticate itself, and it refused:
230 * treat it as though it authenticated with PAP using a username
231 * of "" and a password of "". If that's not OK, boot it out.
233 if (!wo->neg_upap || !null_login(unit)) {
234 syslog(LOG_WARNING, "peer refused to authenticate");
235 lcp_close(unit, "peer refused to authenticate");
240 phase = PHASE_AUTHENTICATE;
243 ChapAuthPeer(unit, our_name, go->chap_mdtype);
245 } else if (go->neg_upap) {
250 ChapAuthWithPeer(unit, user, ho->chap_mdtype);
251 auth |= CHAP_WITHPEER;
252 } else if (ho->neg_upap) {
253 if (passwd[0] == 0) {
254 passwd_from_file = 1;
255 if (!get_pap_passwd(passwd))
256 syslog(LOG_ERR, "No secret found for PAP login");
258 upap_authwithpeer(unit, user, passwd);
259 auth |= PAP_WITHPEER;
261 auth_pending[unit] = auth;
268 * Proceed to the network phase.
275 struct protent *protp;
276 lcp_options *go = &lcp_gotoptions[unit];
279 * If the peer had to authenticate, run the auth-up script now.
281 if ((go->neg_chap || go->neg_upap) && !did_authup) {
282 auth_script(_PATH_AUTHUP);
288 * If we negotiated callback, do it now.
291 phase = PHASE_CALLBACK;
292 (*cbcp_protent.open)(unit);
297 phase = PHASE_NETWORK;
300 set_filters(&pass_filter, &active_filter);
302 for (i = 0; (protp = protocols[i]) != NULL; ++i)
303 if (protp->protocol < 0xC000 && protp->enabled_flag
304 && protp->open != NULL) {
305 (*protp->open)(unit);
306 if (protp->protocol != PPP_CCP)
310 if (num_np_open == 0)
312 lcp_close(0, "No network protocols running");
316 * The peer has failed to authenticate himself using `protocol'.
319 auth_peer_fail(unit, protocol)
323 * Authentication failure: take the link down
325 lcp_close(unit, "Authentication failed");
329 * The peer has been successfully authenticated using `protocol'.
332 auth_peer_success(unit, protocol, name, namelen)
347 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
353 * Save the authenticated name of the peer for later.
355 if (namelen > sizeof(peer_authname) - 1)
356 namelen = sizeof(peer_authname) - 1;
357 BCOPY(name, peer_authname, namelen);
358 peer_authname[namelen] = 0;
361 * If there is no more authentication still to be done,
362 * proceed to the network (or callback) phase.
364 if ((auth_pending[unit] &= ~bit) == 0)
369 * We have failed to authenticate ourselves to the peer using `protocol'.
372 auth_withpeer_fail(unit, protocol)
375 if (passwd_from_file)
376 BZERO(passwd, MAXSECRETLEN);
378 * We've failed to authenticate ourselves to our peer.
379 * He'll probably take the link down, and there's not much
380 * we can do except wait for that.
385 * We have successfully authenticated ourselves with the peer using `protocol'.
388 auth_withpeer_success(unit, protocol)
398 if (passwd_from_file)
399 BZERO(passwd, MAXSECRETLEN);
403 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
409 * If there is no more authentication still being done,
410 * proceed to the network (or callback) phase.
412 if ((auth_pending[unit] &= ~bit) == 0)
418 * np_up - a network protocol has come up.
424 if (num_np_up == 0) {
426 * At this point we consider that the link has come up successfully.
430 if (idle_time_limit > 0)
431 TIMEOUT(check_idle, NULL, idle_time_limit);
434 * Set a timeout to close the connection once the maximum
435 * connect time has expired.
438 TIMEOUT(connect_time_expired, 0, maxconnect);
444 * np_down - a network protocol has gone down.
450 if (--num_np_up == 0 && idle_time_limit > 0) {
451 UNTIMEOUT(check_idle, NULL);
456 * np_finished - a network protocol has finished using the link.
459 np_finished(unit, proto)
462 if (--num_np_open <= 0) {
463 /* no further use for the link: shut up shop. */
464 lcp_close(0, "No network protocols running");
469 * check_idle - check whether the link has been idle for long
470 * enough that we can shut it down.
476 struct ppp_idle idle;
479 if (!get_idle_time(0, &idle))
481 itime = MIN(idle.xmit_idle, idle.recv_idle);
482 if (itime >= idle_time_limit) {
483 /* link is idle: shut it down. */
484 syslog(LOG_INFO, "Terminating connection due to lack of activity.");
485 lcp_close(0, "Link inactive");
487 TIMEOUT(check_idle, NULL, idle_time_limit - itime);
492 * connect_time_expired - log a message and close the connection.
495 connect_time_expired(arg)
498 syslog(LOG_INFO, "Connect time expired");
499 lcp_close(0, "Connect time expired"); /* Close connection */
503 * auth_check_options - called to check authentication options.
508 lcp_options *wo = &lcp_wantoptions[0];
510 ipcp_options *ipwo = &ipcp_wantoptions[0];
513 /* Default our_name to hostname, and user to our_name */
514 if (our_name[0] == 0 || usehostname)
515 strcpy(our_name, hostname);
517 strcpy(user, our_name);
519 /* If authentication is required, ask peer for CHAP or PAP. */
520 if (auth_required && !wo->neg_chap && !wo->neg_upap) {
526 * Check whether we have appropriate secrets to use
527 * to authenticate the peer.
529 can_auth = wo->neg_upap && (uselogin || have_pap_secret());
530 if (!can_auth && wo->neg_chap) {
531 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
532 can_auth = have_chap_secret(remote_name, our_name, remote);
535 if (auth_required && !can_auth) {
536 option_error("peer authentication required but no suitable secret(s) found\n");
537 if (remote_name[0] == 0)
538 option_error("for authenticating any peer to us (%s)\n", our_name);
540 option_error("for authenticating peer %s to us (%s)\n",
541 remote_name, our_name);
546 * Check whether the user tried to override certain values
549 if (!auth_required && auth_req_info.priv > 0) {
550 if (!default_device && devnam_info.priv == 0) {
551 option_error("can't override device name when noauth option used");
554 if ((connector != NULL && connector_info.priv == 0)
555 || (disconnector != NULL && disconnector_info.priv == 0)
556 || (welcomer != NULL && welcomer_info.priv == 0)) {
557 option_error("can't override connect, disconnect or welcome");
558 option_error("option values when noauth option used");
565 * auth_reset - called when LCP is starting negotiations to recheck
566 * authentication options, i.e. whether we have appropriate secrets
567 * to use for authenticating ourselves and/or the peer.
573 lcp_options *go = &lcp_gotoptions[unit];
574 lcp_options *ao = &lcp_allowoptions[0];
575 ipcp_options *ipwo = &ipcp_wantoptions[0];
578 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
579 ao->neg_chap = !refuse_chap
580 && have_chap_secret(user, remote_name, (u_int32_t)0);
582 if (go->neg_upap && !uselogin && !have_pap_secret())
585 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
586 if (!have_chap_secret(remote_name, our_name, remote))
594 * check_passwd - Check the user name and passwd against the PAP secrets
595 * file. If requested, also check against the system password database,
596 * and login the user if OK.
599 * UPAP_AUTHNAK: Authentication failed.
600 * UPAP_AUTHACK: Authentication succeeded.
601 * In either case, msg points to an appropriate message.
604 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg, msglen)
616 struct wordlist *addrs;
618 ipcp_options *ipwo = &ipcp_wantoptions[unit];
619 char passwd[256], user[256];
620 char secret[MAXWORDLEN];
621 static int attempts = 0;
624 * Make copies of apasswd and auser, then null-terminate them.
626 BCOPY(apasswd, passwd, passwdlen);
627 passwd[passwdlen] = '\0';
628 BCOPY(auser, user, userlen);
629 user[userlen] = '\0';
633 * Open the file of pap secrets and scan for a suitable secret
634 * for authenticating this user.
636 filename = _PATH_UPAPFILE;
639 f = fopen(filename, "r");
641 syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
645 check_access(f, filename);
646 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
647 if (scan_authfile(f, user, our_name, remote,
648 secret, &addrs, filename) < 0
649 || (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
650 && strcmp(crypt(passwd, secret), secret) != 0)) {
651 syslog(LOG_WARNING, "PAP authentication failure for %s", user);
657 if (uselogin && ret == UPAP_AUTHACK) {
658 ret = plogin(user, passwd, msg, msglen);
659 if (ret == UPAP_AUTHNAK) {
660 syslog(LOG_WARNING, "PAP login failure for %s", user);
664 if (ret == UPAP_AUTHNAK) {
665 if (*msg == (char *) 0)
666 *msg = "Login incorrect";
667 *msglen = strlen(*msg);
669 * Frustrate passwd stealer programs.
670 * Allow 10 tries, but start backing off after 3 (stolen from login).
671 * On 10'th, drop the connection.
673 if (attempts++ >= 10) {
674 syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
675 attempts, devnam, user);
679 sleep((u_int) (attempts - 3) * 5);
681 free_wordlist(addrs);
684 attempts = 0; /* Reset count */
685 if (*msg == (char *) 0)
687 *msglen = strlen(*msg);
688 set_allowed_addrs(unit, addrs);
691 BZERO(passwd, sizeof(passwd));
692 BZERO(secret, sizeof(secret));
698 * This function is needed for PAM. However, it should not be called.
699 * If it is, return the error code.
703 static int pam_conv(int num_msg, const struct pam_message **msg,
704 struct pam_response **resp, void *appdata_ptr)
711 * plogin - Check the user name and password against the system
712 * password database, and login the user if OK.
715 * UPAP_AUTHNAK: Login failed.
716 * UPAP_AUTHACK: Login succeeded.
717 * In either case, msg points to an appropriate message.
721 plogin(user, passwd, msg, msglen)
730 struct pam_conv pam_conversation;
736 * Fill the pam_conversion structure
738 memset (&pam_conversation, '\0', sizeof (struct pam_conv));
739 pam_conversation.conv = &pam_conv;
741 pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
742 if (pam_error != PAM_SUCCESS) {
743 *msg = (char *) pam_strerror (pam_error);
747 * Define the fields for the credintial validation
749 (void) pam_set_item (pamh, PAM_AUTHTOK, passwd);
750 (void) pam_set_item (pamh, PAM_TTY, devnam);
754 pam_error = pam_authenticate (pamh, PAM_SILENT);
755 if (pam_error == PAM_SUCCESS)
756 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
758 *msg = (char *) pam_strerror (pam_error);
762 (void) pam_end (pamh, pam_error);
764 if (pam_error != PAM_SUCCESS)
767 * Use the non-PAM methods directly
769 #else /* #ifdef USE_PAM */
775 struct spwd *getspnam();
776 extern int isexpired (struct passwd *, struct spwd *); /* in libshadow.a */
781 return (UPAP_AUTHNAK);
785 spwd = getspnam(user);
788 /* check the age of the password entry */
789 if (isexpired(pw, spwd)) {
790 syslog(LOG_WARNING,"Expired password for %s",user);
791 return (UPAP_AUTHNAK);
793 pw->pw_passwd = spwd->sp_pwdp;
798 * If no passwd, don't let them login.
800 if (pw->pw_passwd == NULL || *pw->pw_passwd == '\0'
801 || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
802 return (UPAP_AUTHNAK);
804 #endif /* #ifdef USE_PAM */
806 syslog(LOG_INFO, "user %s logged in", user);
809 * Write a wtmp entry for this user.
812 if (strncmp(tty, "/dev/", 5) == 0)
814 logwtmp(tty, user, remote_name); /* Add wtmp login entry */
821 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
822 (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
823 memset((void *)&ll, 0, sizeof(ll));
824 (void)time(&ll.ll_time);
825 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
826 (void)write(fd, (char *)&ll, sizeof(ll));
833 return (UPAP_AUTHACK);
837 * plogout - Logout the user.
845 if (strncmp(tty, "/dev/", 5) == 0)
847 logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
853 * null_login - Check if a username of "" and a password of "" are
854 * acceptable, and iff so, set the list of acceptable IP addresses
864 struct wordlist *addrs;
865 char secret[MAXWORDLEN];
868 * Open the file of pap secrets and scan for a suitable secret.
869 * We don't accept a wildcard client.
871 filename = _PATH_UPAPFILE;
873 f = fopen(filename, "r");
876 check_access(f, filename);
878 i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
879 ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
880 BZERO(secret, sizeof(secret));
883 set_allowed_addrs(unit, addrs);
885 free_wordlist(addrs);
893 * get_pap_passwd - get a password for authenticating ourselves with
894 * our peer using PAP. Returns 1 on success, 0 if no suitable password
898 get_pap_passwd(passwd)
904 struct wordlist *addrs;
905 char secret[MAXWORDLEN];
907 filename = _PATH_UPAPFILE;
909 f = fopen(filename, "r");
912 check_access(f, filename);
913 ret = scan_authfile(f, user,
914 remote_name[0]? remote_name: NULL,
915 (u_int32_t)0, secret, NULL, filename);
919 if (passwd != NULL) {
920 strncpy(passwd, secret, MAXSECRETLEN);
921 passwd[MAXSECRETLEN-1] = 0;
923 BZERO(secret, sizeof(secret));
929 * have_pap_secret - check whether we have a PAP file with any
930 * secrets that we could possibly use for authenticating the peer.
938 ipcp_options *ipwo = &ipcp_wantoptions[0];
941 filename = _PATH_UPAPFILE;
942 f = fopen(filename, "r");
946 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
947 ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
957 * have_chap_secret - check whether we have a CHAP file with a
958 * secret that we could possibly use for authenticating `client'
959 * on `server'. Either can be the null string, meaning we don't
960 * know the identity yet.
963 have_chap_secret(client, server, remote)
972 filename = _PATH_CHAPFILE;
973 f = fopen(filename, "r");
979 else if (server[0] == 0)
982 ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
992 * get_secret - open the CHAP secret file and return the secret
993 * for authenticating the given client on the given server.
994 * (We could be either client or server).
997 get_secret(unit, client, server, secret, secret_len, save_addrs)
1008 struct wordlist *addrs;
1009 char secbuf[MAXWORDLEN];
1011 filename = _PATH_CHAPFILE;
1015 f = fopen(filename, "r");
1017 syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
1020 check_access(f, filename);
1022 ret = scan_authfile(f, client, server, (u_int32_t)0,
1023 secbuf, &addrs, filename);
1029 set_allowed_addrs(unit, addrs);
1031 len = strlen(secbuf);
1032 if (len > MAXSECRETLEN) {
1033 syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
1036 BCOPY(secbuf, secret, len);
1037 BZERO(secbuf, sizeof(secbuf));
1044 * set_allowed_addrs() - set the list of allowed addresses.
1047 set_allowed_addrs(unit, addrs)
1049 struct wordlist *addrs;
1051 if (addresses[unit] != NULL)
1052 free_wordlist(addresses[unit]);
1053 addresses[unit] = addrs;
1056 * If there's only one authorized address we might as well
1057 * ask our peer for that one right away
1059 if (addrs != NULL && addrs->next == NULL) {
1060 char *p = addrs->word;
1061 struct ipcp_options *wo = &ipcp_wantoptions[unit];
1065 if (wo->hisaddr == 0 && *p != '!' && *p != '-'
1066 && strchr(p, '/') == NULL) {
1067 hp = gethostbyname(p);
1068 if (hp != NULL && hp->h_addrtype == AF_INET)
1069 a = *(u_int32_t *)hp->h_addr;
1072 if (a != (u_int32_t) -1)
1079 * auth_ip_addr - check whether the peer is authorized to use
1080 * a given IP address. Returns 1 if authorized, 0 otherwise.
1083 auth_ip_addr(unit, addr)
1087 return ip_addr_check(addr, addresses[unit]);
1091 ip_addr_check(addr, addrs)
1093 struct wordlist *addrs;
1095 u_int32_t a, mask, ah;
1097 char *ptr_word, *ptr_mask;
1101 /* don't allow loopback or multicast address */
1102 if (bad_ip_adrs(addr))
1106 return !auth_required; /* no addresses authorized */
1108 for (; addrs != NULL; addrs = addrs->next) {
1109 /* "-" means no addresses authorized, "*" means any address allowed */
1110 ptr_word = addrs->word;
1111 if (strcmp(ptr_word, "-") == 0)
1113 if (strcmp(ptr_word, "*") == 0)
1117 if (*ptr_word == '!') {
1122 mask = ~ (u_int32_t) 0;
1123 ptr_mask = strchr (ptr_word, '/');
1124 if (ptr_mask != NULL) {
1127 bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
1128 if (bit_count <= 0 || bit_count > 32) {
1129 syslog (LOG_WARNING,
1130 "invalid address length %s in auth. address list",
1135 mask <<= 32 - bit_count;
1138 hp = gethostbyname(ptr_word);
1139 if (hp != NULL && hp->h_addrtype == AF_INET) {
1140 a = *(u_int32_t *)hp->h_addr;
1142 np = getnetbyname (ptr_word);
1143 if (np != NULL && np->n_addrtype == AF_INET) {
1144 a = htonl (*(u_int32_t *)np->n_net);
1145 if (ptr_mask == NULL) {
1146 /* calculate appropriate mask for net */
1149 mask = IN_CLASSA_NET;
1150 else if (IN_CLASSB(ah))
1151 mask = IN_CLASSB_NET;
1152 else if (IN_CLASSC(ah))
1153 mask = IN_CLASSC_NET;
1156 a = inet_addr (ptr_word);
1160 if (ptr_mask != NULL)
1163 if (a == (u_int32_t)-1L)
1164 syslog (LOG_WARNING,
1165 "unknown host %s in auth. address list",
1168 /* Here a and addr are in network byte order,
1169 and mask is in host order. */
1170 if (((addr ^ a) & htonl(mask)) == 0)
1173 return 0; /* not in list => can't have it */
1177 * bad_ip_adrs - return 1 if the IP address is one we don't want
1178 * to use, such as an address in the loopback net or a multicast address.
1179 * addr is in network byte order.
1186 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1187 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1191 * check_access - complain if a secret file has too-liberal permissions.
1194 check_access(f, filename)
1200 if (fstat(fileno(f), &sbuf) < 0) {
1201 syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
1202 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
1203 syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
1209 * scan_authfile - Scan an authorization file for a secret suitable
1210 * for authenticating `client' on `server'. The return value is -1
1211 * if no secret is found, otherwise >= 0. The return value has
1212 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
1213 * NONWILD_SERVER set if the secret didn't have "*" for the server.
1214 * Any following words on the line (i.e. address authorization
1215 * info) are placed in a wordlist and returned in *addrs.
1218 scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
1224 struct wordlist **addrs;
1228 int got_flag, best_flag;
1230 struct wordlist *ap, *addr_list, *alist, *alast;
1231 char word[MAXWORDLEN];
1232 char atfile[MAXWORDLEN];
1233 char lsecret[MAXWORDLEN];
1238 if (!getword(f, word, &newline, filename))
1239 return -1; /* file is empty??? */
1244 * Skip until we find a word at the start of a line.
1246 while (!newline && getword(f, word, &newline, filename))
1249 break; /* got to end of file */
1252 * Got a client - check if it's a match or a wildcard.
1255 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
1260 got_flag = NONWILD_CLIENT;
1263 * Now get a server and check if it matches.
1265 if (!getword(f, word, &newline, filename))
1269 if (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
1272 got_flag |= NONWILD_SERVER;
1275 * Got some sort of a match - see if it's better than what
1278 if (got_flag <= best_flag)
1284 if (!getword(f, word, &newline, filename))
1290 * Special syntax: @filename means read secret from file.
1292 if (word[0] == '@') {
1293 strcpy(atfile, word+1);
1294 if ((sf = fopen(atfile, "r")) == NULL) {
1295 syslog(LOG_WARNING, "can't open indirect secret file %s",
1299 check_access(sf, atfile);
1300 if (!getword(sf, word, &xxx, atfile)) {
1301 syslog(LOG_WARNING, "no secret in indirect secret file %s",
1309 strcpy(lsecret, word);
1312 * Now read address authorization info and make a wordlist.
1314 alist = alast = NULL;
1316 if (!getword(f, word, &newline, filename) || newline)
1318 ap = (struct wordlist *) malloc(sizeof(struct wordlist)
1321 novm("authorized addresses");
1323 strcpy(ap->word, word);
1332 * Check if the given IP address is allowed by the wordlist.
1334 if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
1335 free_wordlist(alist);
1340 * This is the best so far; remember it.
1342 best_flag = got_flag;
1344 free_wordlist(addr_list);
1347 strcpy(secret, lsecret);
1355 else if (addr_list != NULL)
1356 free_wordlist(addr_list);
1362 * free_wordlist - release memory allocated for a wordlist.
1366 struct wordlist *wp;
1368 struct wordlist *next;
1370 while (wp != NULL) {
1378 * auth_script - execute a script with arguments
1379 * interface-name peer-name real-user tty speed
1391 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
1392 user_name = pw->pw_name;
1394 sprintf(struid, "%d", getuid());
1397 sprintf(strspeed, "%d", baud_rate);
1401 argv[2] = peer_authname;
1402 argv[3] = user_name;
1407 run_program(script, argv, 0);