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 1.29 1996/10/08 06:43:15 paulus Exp $";
46 #include <sys/types.h>
48 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <arpa/inet.h>
57 #if defined(SUNOS4) || defined(ULTRIX)
63 #include <security/pam_appl.h>
64 #include <security/pam_modules.h>
65 int isexpired (struct passwd *, struct spwd *);
70 #include <shadow/pwauth.h>
72 #define PW_PPP PW_LOGIN
85 #include "pathnames.h"
87 /* Used for storing a sequence of words. Usually malloced. */
89 struct wordlist *next;
93 /* Bits in scan_authfile return value */
94 #define NONWILD_SERVER 1
95 #define NONWILD_CLIENT 2
97 #define ISWILD(word) (word[0] == '*' && word[1] == 0)
102 /* The name by which the peer authenticated itself to us. */
103 char peer_authname[MAXNAMELEN];
105 /* Records which authentication operations haven't completed yet. */
106 static int auth_pending[NUM_PPP];
108 /* Set if we have successfully called login() */
109 static int logged_in;
111 /* Set if we have run the /etc/ppp/auth-up script. */
112 static int did_authup;
114 /* List of addresses which the peer may use. */
115 static struct wordlist *addresses[NUM_PPP];
117 /* Number of network protocols which we have opened. */
118 static int num_np_open;
120 /* Number of network protocols which have come up. */
121 static int num_np_up;
123 /* Set if we got the contents of passwd[] from the pap-secrets file. */
124 static int passwd_from_file;
126 /* Bits in auth_pending[] */
127 #define PAP_WITHPEER 1
129 #define CHAP_WITHPEER 4
132 /* Prototypes for procedures local to this file. */
134 static void network_phase __P((int));
135 static void check_idle __P((caddr_t));
136 static int login __P((char *, char *, char **, int *));
137 static void logout __P((void));
138 static int null_login __P((int));
139 static int get_pap_passwd __P((char *));
140 static int have_pap_secret __P((void));
141 static int have_chap_secret __P((char *, char *, u_int32_t));
142 static int ip_addr_check __P((u_int32_t, struct wordlist *));
143 static int scan_authfile __P((FILE *, char *, char *, u_int32_t, char *,
144 struct wordlist **, char *));
145 static void free_wordlist __P((struct wordlist *));
146 static void auth_script __P((char *));
148 static void callback_phase __P((int));
152 * An Open on LCP has requested a change from Dead to Establish phase.
153 * Do what's necessary to bring the physical layer up.
162 * LCP has terminated the link; go to the Dead phase and take the
163 * physical layer down.
166 link_terminated(unit)
169 if (phase == PHASE_DEAD)
174 syslog(LOG_NOTICE, "Connection terminated.");
178 * LCP has gone down; it will either die or try to re-establish.
185 struct protent *protp;
188 auth_script(_PATH_AUTHDOWN);
191 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
192 if (!protp->enabled_flag)
194 if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
195 (*protp->lowerdown)(unit);
196 if (protp->protocol < 0xC000 && protp->close != NULL)
197 (*protp->close)(unit, "LCP down");
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)
312 * The peer has failed to authenticate himself using `protocol'.
315 auth_peer_fail(unit, protocol)
319 * Authentication failure: take the link down
321 lcp_close(unit, "Authentication failed");
325 * The peer has been successfully authenticated using `protocol'.
328 auth_peer_success(unit, protocol, name, namelen)
343 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
349 * Save the authenticated name of the peer for later.
351 if (namelen > sizeof(peer_authname) - 1)
352 namelen = sizeof(peer_authname) - 1;
353 BCOPY(name, peer_authname, namelen);
354 peer_authname[namelen] = 0;
357 * If there is no more authentication still to be done,
358 * proceed to the network (or callback) phase.
360 if ((auth_pending[unit] &= ~bit) == 0)
365 * We have failed to authenticate ourselves to the peer using `protocol'.
368 auth_withpeer_fail(unit, protocol)
371 if (passwd_from_file)
372 BZERO(passwd, MAXSECRETLEN);
374 * We've failed to authenticate ourselves to our peer.
375 * He'll probably take the link down, and there's not much
376 * we can do except wait for that.
381 * We have successfully authenticated ourselves with the peer using `protocol'.
384 auth_withpeer_success(unit, protocol)
394 if (passwd_from_file)
395 BZERO(passwd, MAXSECRETLEN);
399 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
405 * If there is no more authentication still being done,
406 * proceed to the network (or callback) phase.
408 if ((auth_pending[unit] &= ~bit) == 0)
414 * np_up - a network protocol has come up.
420 if (num_np_up == 0 && idle_time_limit > 0) {
421 TIMEOUT(check_idle, NULL, idle_time_limit);
427 * np_down - a network protocol has gone down.
433 if (--num_np_up == 0 && idle_time_limit > 0) {
434 UNTIMEOUT(check_idle, NULL);
439 * np_finished - a network protocol has finished using the link.
442 np_finished(unit, proto)
445 if (--num_np_open <= 0) {
446 /* no further use for the link: shut up shop. */
447 lcp_close(0, "No network protocols running");
452 * check_idle - check whether the link has been idle for long
453 * enough that we can shut it down.
459 struct ppp_idle idle;
462 if (!get_idle_time(0, &idle))
464 itime = MIN(idle.xmit_idle, idle.recv_idle);
465 if (itime >= idle_time_limit) {
466 /* link is idle: shut it down. */
467 syslog(LOG_INFO, "Terminating connection due to lack of activity.");
469 lcp_close(0, "Link inactive");
471 TIMEOUT(check_idle, NULL, idle_time_limit - itime);
476 * auth_check_options - called to check authentication options.
481 lcp_options *wo = &lcp_wantoptions[0];
483 ipcp_options *ipwo = &ipcp_wantoptions[0];
486 /* Default our_name to hostname, and user to our_name */
487 if (our_name[0] == 0 || usehostname)
488 strcpy(our_name, hostname);
490 strcpy(user, our_name);
492 /* If authentication is required, ask peer for CHAP or PAP. */
493 if (auth_required && !wo->neg_chap && !wo->neg_upap) {
499 * Check whether we have appropriate secrets to use
500 * to authenticate the peer.
502 can_auth = wo->neg_upap && (uselogin || have_pap_secret());
503 if (!can_auth && wo->neg_chap) {
504 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
505 can_auth = have_chap_secret(remote_name, our_name, remote);
508 if (auth_required && !can_auth) {
509 option_error("peer authentication required but no suitable secret(s) found\n");
510 if (remote_name[0] == 0)
511 option_error("for authenticating any peer to us (%s)\n", our_name);
513 option_error("for authenticating peer %s to us (%s)\n",
514 remote_name, our_name);
519 * Check whether the user tried to override certain values
522 if (!auth_required && auth_req_info.priv > 0) {
523 if (!default_device && devnam_info.priv == 0) {
524 option_error("can't override device name when noauth option used");
527 if (connector != NULL && connector_info.priv == 0
528 || disconnector != NULL && disconnector_info.priv == 0
529 || welcomer != NULL && welcomer_info.priv == 0) {
530 option_error("can't override connect, disconnect or welcome");
531 option_error("option values when noauth option used");
538 * auth_reset - called when LCP is starting negotiations to recheck
539 * authentication options, i.e. whether we have appropriate secrets
540 * to use for authenticating ourselves and/or the peer.
546 lcp_options *go = &lcp_gotoptions[unit];
547 lcp_options *ao = &lcp_allowoptions[0];
548 ipcp_options *ipwo = &ipcp_wantoptions[0];
551 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
552 ao->neg_chap = !refuse_chap
553 && have_chap_secret(user, remote_name, (u_int32_t)0);
555 if (go->neg_upap && !uselogin && !have_pap_secret())
558 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
559 if (!have_chap_secret(remote_name, our_name, remote))
567 * check_passwd - Check the user name and passwd against the PAP secrets
568 * file. If requested, also check against the system password database,
569 * and login the user if OK.
572 * UPAP_AUTHNAK: Authentication failed.
573 * UPAP_AUTHACK: Authentication succeeded.
574 * In either case, msg points to an appropriate message.
577 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg, msglen)
589 struct wordlist *addrs;
591 ipcp_options *ipwo = &ipcp_wantoptions[unit];
592 char passwd[256], user[256];
593 char secret[MAXWORDLEN];
594 static int attempts = 0;
597 * Make copies of apasswd and auser, then null-terminate them.
599 BCOPY(apasswd, passwd, passwdlen);
600 passwd[passwdlen] = '\0';
601 BCOPY(auser, user, userlen);
602 user[userlen] = '\0';
606 * Open the file of pap secrets and scan for a suitable secret
607 * for authenticating this user.
609 filename = _PATH_UPAPFILE;
612 f = fopen(filename, "r");
615 syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
620 check_access(f, filename);
621 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
622 if (scan_authfile(f, user, our_name, remote,
623 secret, &addrs, filename) < 0
624 || (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
625 && strcmp(crypt(passwd, secret), secret) != 0)) {
626 syslog(LOG_WARNING, "PAP authentication failure for %s", user);
632 if (uselogin && ret == UPAP_AUTHACK) {
633 ret = login(user, passwd, msg, msglen);
634 if (ret == UPAP_AUTHNAK) {
635 syslog(LOG_WARNING, "PAP login failure for %s", user);
639 if (ret == UPAP_AUTHNAK) {
640 if (*msg == (char *) 0)
641 *msg = "Login incorrect";
642 *msglen = strlen(*msg);
644 * Frustrate passwd stealer programs.
645 * Allow 10 tries, but start backing off after 3 (stolen from login).
646 * On 10'th, drop the connection.
648 if (attempts++ >= 10) {
649 syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
650 attempts, devnam, user);
654 sleep((u_int) (attempts - 3) * 5);
656 free_wordlist(addrs);
659 attempts = 0; /* Reset count */
660 if (*msg == (char *) 0)
662 *msglen = strlen(*msg);
663 if (addresses[unit] != NULL)
664 free_wordlist(addresses[unit]);
665 addresses[unit] = addrs;
668 BZERO(passwd, sizeof(passwd));
669 BZERO(secret, sizeof(secret));
676 * This function was lifted from the shadow-3.3.2 version by John Haugh II.
677 * It is included because the function was not in the standard libshadow
678 * library. If it is included in the library then I can remove it from here.
681 #define DAY (24L*3600L)
683 * isexpired - determine if account is expired yet
685 * isexpired calculates the expiration date based on the
686 * password expiration criteria.
697 clock = time ((time_t *) 0) / DAY;
700 * Quick and easy - there is an expired account field
701 * along with an inactive account field. Do the expired
702 * one first since it is worse.
705 if (sp->sp_expire > 0 && sp->sp_expire < clock)
708 if (sp->sp_inact > 0 && sp->sp_lstchg > 0 && sp->sp_max > 0 &&
709 sp->sp_inact + sp->sp_lstchg + sp->sp_max < clock)
713 * The last and max fields must be present for an account
714 * to have an expired password. A maximum of >10000 days
715 * is considered to be infinite.
718 if (sp->sp_lstchg == -1 ||
719 sp->sp_max == -1 || sp->sp_max >= 10000L)
723 * Calculate today's day and the day on which the password
724 * is going to expire. If that date has already passed,
725 * the password has expired.
728 if (sp->sp_lstchg + sp->sp_max < clock)
737 * This function is needed for PAM. However, it should not be called.
738 * If it is, return the error code.
742 static int pam_conv(int num_msg, const struct pam_message **msg,
743 struct pam_response **resp, void *appdata_ptr)
750 * login - Check the user name and password against the system
751 * password database, and login the user if OK.
754 * UPAP_AUTHNAK: Login failed.
755 * UPAP_AUTHACK: Login succeeded.
756 * In either case, msg points to an appropriate message.
760 login(user, passwd, msg, msglen)
769 struct pam_conv pam_conversation;
775 * Fill the pam_conversion structure
777 memset (&pam_conversation, '\0', sizeof (struct pam_conv));
778 pam_conversation.conv = &pam_conv;
780 pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
781 if (pam_error != PAM_SUCCESS) {
782 *msg = (char *) pam_strerror (pam_error);
786 * Define the fields for the credintial validation
788 (void) pam_set_item (pamh, PAM_AUTHTOK, passwd);
789 (void) pam_set_item (pamh, PAM_TTY, devnam);
793 pam_error = pam_authenticate (pamh, PAM_SILENT);
794 if (pam_error == PAM_SUCCESS)
795 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
797 *msg = (char *) pam_strerror (pam_error);
801 (void) pam_end (pamh, pam_error);
803 if (pam_error != PAM_SUCCESS)
806 * Use the non-PAM methods directly
808 #else /* #ifdef USE_PAM */
815 struct spwd *getspnam();
820 return (UPAP_AUTHNAK);
824 spwd = getspnam(user);
827 /* check the age of the password entry */
828 if (isexpired(pw, spwd)) {
829 syslog(LOG_WARNING,"Expired password for %s",user);
830 return (UPAP_AUTHNAK);
832 pw->pw_passwd = spwd->sp_pwdp;
837 * XXX If no passwd, let them login without one.
839 if (pw->pw_passwd != NULL && *pw->pw_passwd != '\0') {
840 epasswd = crypt(passwd, pw->pw_passwd);
841 if (strcmp(epasswd, pw->pw_passwd) != 0) {
842 return (UPAP_AUTHNAK);
845 #endif /* #ifdef USE_PAM */
847 syslog(LOG_INFO, "user %s logged in", user);
850 * Write a wtmp entry for this user.
853 if (strncmp(tty, "/dev/", 5) == 0)
855 logwtmp(tty, user, remote_name); /* Add wtmp login entry */
858 return (UPAP_AUTHACK);
862 * logout - Logout the user.
870 if (strncmp(tty, "/dev/", 5) == 0)
872 logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
878 * null_login - Check if a username of "" and a password of "" are
879 * acceptable, and iff so, set the list of acceptable IP addresses
889 struct wordlist *addrs;
890 char secret[MAXWORDLEN];
893 * Open the file of pap secrets and scan for a suitable secret.
894 * We don't accept a wildcard client.
896 filename = _PATH_UPAPFILE;
898 f = fopen(filename, "r");
901 check_access(f, filename);
903 i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
904 ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
905 BZERO(secret, sizeof(secret));
908 if (addresses[unit] != NULL)
909 free_wordlist(addresses[unit]);
910 addresses[unit] = addrs;
919 * get_pap_passwd - get a password for authenticating ourselves with
920 * our peer using PAP. Returns 1 on success, 0 if no suitable password
924 get_pap_passwd(passwd)
929 struct wordlist *addrs;
930 char secret[MAXWORDLEN];
932 filename = _PATH_UPAPFILE;
934 f = fopen(filename, "r");
937 check_access(f, filename);
938 if (scan_authfile(f, user,
939 remote_name[0]? remote_name: NULL,
940 (u_int32_t)0, secret, NULL, filename) < 0)
942 if (passwd != NULL) {
943 strncpy(passwd, secret, MAXSECRETLEN);
944 passwd[MAXSECRETLEN-1] = 0;
946 BZERO(secret, sizeof(secret));
952 * have_pap_secret - check whether we have a PAP file with any
953 * secrets that we could possibly use for authenticating the peer.
961 ipcp_options *ipwo = &ipcp_wantoptions[0];
964 filename = _PATH_UPAPFILE;
965 f = fopen(filename, "r");
969 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
970 ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
980 * have_chap_secret - check whether we have a CHAP file with a
981 * secret that we could possibly use for authenticating `client'
982 * on `server'. Either can be the null string, meaning we don't
983 * know the identity yet.
986 have_chap_secret(client, server, remote)
995 filename = _PATH_CHAPFILE;
996 f = fopen(filename, "r");
1002 else if (server[0] == 0)
1005 ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
1015 * get_secret - open the CHAP secret file and return the secret
1016 * for authenticating the given client on the given server.
1017 * (We could be either client or server).
1020 get_secret(unit, client, server, secret, secret_len, save_addrs)
1031 struct wordlist *addrs;
1032 char secbuf[MAXWORDLEN];
1034 filename = _PATH_CHAPFILE;
1038 f = fopen(filename, "r");
1040 syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
1043 check_access(f, filename);
1045 ret = scan_authfile(f, client, server, (u_int32_t)0,
1046 secbuf, &addrs, filename);
1052 if (addresses[unit] != NULL)
1053 free_wordlist(addresses[unit]);
1054 addresses[unit] = addrs;
1057 len = strlen(secbuf);
1058 if (len > MAXSECRETLEN) {
1059 syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
1062 BCOPY(secbuf, secret, len);
1063 BZERO(secbuf, sizeof(secbuf));
1070 * auth_ip_addr - check whether the peer is authorized to use
1071 * a given IP address. Returns 1 if authorized, 0 otherwise.
1074 auth_ip_addr(unit, addr)
1078 return ip_addr_check(addr, addresses[unit]);
1082 ip_addr_check(addr, addrs)
1084 struct wordlist *addrs;
1086 u_int32_t a, mask, ah;
1088 char *ptr_word, *ptr_mask;
1092 /* don't allow loopback or multicast address */
1093 if (bad_ip_adrs(addr))
1097 return 1; /* no restriction */
1099 for (; addrs != NULL; addrs = addrs->next) {
1100 /* "-" means no addresses authorized */
1101 ptr_word = addrs->word;
1102 if (strcmp(ptr_word, "-") == 0)
1106 if (*ptr_word == '!') {
1111 mask = ~ (u_int32_t) 0;
1112 ptr_mask = strchr (ptr_word, '/');
1113 if (ptr_mask != NULL) {
1116 bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
1117 if (bit_count <= 0 || bit_count > 32) {
1118 syslog (LOG_WARNING,
1119 "invalid address length %s in auth. address list",
1124 mask <<= 32 - bit_count;
1127 hp = gethostbyname(ptr_word);
1128 if (hp != NULL && hp->h_addrtype == AF_INET) {
1129 a = *(u_int32_t *)hp->h_addr;
1130 mask = ~ (u_int32_t) 0; /* are we sure we want this? */
1132 np = getnetbyname (ptr_word);
1133 if (np != NULL && np->n_addrtype == AF_INET)
1134 a = htonl (*(u_int32_t *)np->n_net);
1136 a = inet_addr (ptr_word);
1137 if (ptr_mask == NULL) {
1138 /* calculate appropriate mask for net */
1141 mask = IN_CLASSA_NET;
1142 else if (IN_CLASSB(ah))
1143 mask = IN_CLASSB_NET;
1144 else if (IN_CLASSC(ah))
1145 mask = IN_CLASSC_NET;
1149 if (ptr_mask != NULL)
1153 syslog (LOG_WARNING,
1154 "unknown host %s in auth. address list",
1157 if (((addr ^ a) & htonl(mask)) == 0)
1160 return 0; /* not in list => can't have it */
1164 * bad_ip_adrs - return 1 if the IP address is one we don't want
1165 * to use, such as an address in the loopback net or a multicast address.
1166 * addr is in network byte order.
1173 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1174 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1178 * check_access - complain if a secret file has too-liberal permissions.
1181 check_access(f, filename)
1187 if (fstat(fileno(f), &sbuf) < 0) {
1188 syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
1189 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
1190 syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
1196 * scan_authfile - Scan an authorization file for a secret suitable
1197 * for authenticating `client' on `server'. The return value is -1
1198 * if no secret is found, otherwise >= 0. The return value has
1199 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
1200 * NONWILD_SERVER set if the secret didn't have "*" for the server.
1201 * Any following words on the line (i.e. address authorization
1202 * info) are placed in a wordlist and returned in *addrs.
1205 scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
1211 struct wordlist **addrs;
1215 int got_flag, best_flag;
1217 struct wordlist *ap, *addr_list, *alist, *alast;
1218 char word[MAXWORDLEN];
1219 char atfile[MAXWORDLEN];
1220 char lsecret[MAXWORDLEN];
1225 if (!getword(f, word, &newline, filename))
1226 return -1; /* file is empty??? */
1231 * Skip until we find a word at the start of a line.
1233 while (!newline && getword(f, word, &newline, filename))
1236 break; /* got to end of file */
1239 * Got a client - check if it's a match or a wildcard.
1242 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
1247 got_flag = NONWILD_CLIENT;
1250 * Now get a server and check if it matches.
1252 if (!getword(f, word, &newline, filename))
1256 if (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
1259 got_flag |= NONWILD_SERVER;
1262 * Got some sort of a match - see if it's better than what
1265 if (got_flag <= best_flag)
1271 if (!getword(f, word, &newline, filename))
1277 * Special syntax: @filename means read secret from file.
1279 if (word[0] == '@') {
1280 strcpy(atfile, word+1);
1281 if ((sf = fopen(atfile, "r")) == NULL) {
1282 syslog(LOG_WARNING, "can't open indirect secret file %s",
1286 check_access(sf, atfile);
1287 if (!getword(sf, word, &xxx, atfile)) {
1288 syslog(LOG_WARNING, "no secret in indirect secret file %s",
1296 strcpy(lsecret, word);
1299 * Now read address authorization info and make a wordlist.
1301 alist = alast = NULL;
1303 if (!getword(f, word, &newline, filename) || newline)
1305 ap = (struct wordlist *) malloc(sizeof(struct wordlist)
1308 novm("authorized addresses");
1310 strcpy(ap->word, word);
1319 * Check if the given IP address is allowed by the wordlist.
1321 if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
1322 free_wordlist(alist);
1327 * This is the best so far; remember it.
1329 best_flag = got_flag;
1331 free_wordlist(addr_list);
1334 strcpy(secret, lsecret);
1342 else if (addr_list != NULL)
1343 free_wordlist(addr_list);
1349 * free_wordlist - release memory allocated for a wordlist.
1353 struct wordlist *wp;
1355 struct wordlist *next;
1357 while (wp != NULL) {
1365 * auth_script - execute a script with arguments
1366 * interface-name peer-name real-user tty speed
1378 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
1379 user_name = pw->pw_name;
1381 sprintf(struid, "%d", getuid());
1384 sprintf(strspeed, "%d", baud_rate);
1388 argv[2] = peer_authname;
1389 argv[3] = user_name;
1394 run_program(script, argv, 0);