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 1.26 1996/08/28 06:39:12 paulus Exp $";
46 #include <sys/types.h>
48 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <arpa/inet.h>
63 #include <security/pam_appl.h>
64 #include <security/pam_modules.h>
69 #include <shadow/pwauth.h>
71 #define PW_PPP PW_LOGIN
81 #include "pathnames.h"
83 #if defined(sun) && defined(sparc)
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 *));
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 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);
283 phase = PHASE_NETWORK;
286 set_filters(&pass_filter, &active_filter);
288 for (i = 0; (protp = protocols[i]) != NULL; ++i)
289 if (protp->protocol < 0xC000 && protp->enabled_flag
290 && protp->open != NULL) {
291 (*protp->open)(unit);
292 if (protp->protocol != PPP_CCP)
298 * The peer has failed to authenticate himself using `protocol'.
301 auth_peer_fail(unit, protocol)
305 * Authentication failure: take the link down
307 lcp_close(unit, "Authentication failed");
311 * The peer has been successfully authenticated using `protocol'.
314 auth_peer_success(unit, protocol, name, namelen)
329 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
335 * Save the authenticated name of the peer for later.
337 if (namelen > sizeof(peer_authname) - 1)
338 namelen = sizeof(peer_authname) - 1;
339 BCOPY(name, peer_authname, namelen);
340 peer_authname[namelen] = 0;
343 * If there is no more authentication still to be done,
344 * proceed to the network phase.
346 if ((auth_pending[unit] &= ~bit) == 0)
351 * We have failed to authenticate ourselves to the peer using `protocol'.
354 auth_withpeer_fail(unit, protocol)
357 if (passwd_from_file)
358 BZERO(passwd, MAXSECRETLEN);
360 * We've failed to authenticate ourselves to our peer.
361 * He'll probably take the link down, and there's not much
362 * we can do except wait for that.
367 * We have successfully authenticated ourselves with the peer using `protocol'.
370 auth_withpeer_success(unit, protocol)
380 if (passwd_from_file)
381 BZERO(passwd, MAXSECRETLEN);
385 syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
391 * If there is no more authentication still being done,
392 * proceed to the network phase.
394 if ((auth_pending[unit] &= ~bit) == 0)
400 * np_up - a network protocol has come up.
406 if (num_np_up == 0 && idle_time_limit > 0) {
407 TIMEOUT(check_idle, NULL, idle_time_limit);
413 * np_down - a network protocol has gone down.
419 if (--num_np_up == 0 && idle_time_limit > 0) {
420 UNTIMEOUT(check_idle, NULL);
425 * np_finished - a network protocol has finished using the link.
428 np_finished(unit, proto)
431 if (--num_np_open <= 0) {
432 /* no further use for the link: shut up shop. */
433 lcp_close(0, "No network protocols running");
438 * check_idle - check whether the link has been idle for long
439 * enough that we can shut it down.
445 struct ppp_idle idle;
448 if (!get_idle_time(0, &idle))
450 itime = MIN(idle.xmit_idle, idle.recv_idle);
451 if (itime >= idle_time_limit) {
452 /* link is idle: shut it down. */
453 syslog(LOG_INFO, "Terminating connection due to lack of activity.");
455 lcp_close(0, "Link inactive");
457 TIMEOUT(check_idle, NULL, idle_time_limit - itime);
462 * auth_check_options - called to check authentication options.
467 lcp_options *wo = &lcp_wantoptions[0];
469 ipcp_options *ipwo = &ipcp_wantoptions[0];
472 /* Check that we are running as root. */
473 if (geteuid() != 0) {
474 option_error("must be run with root privileges");
478 /* Default our_name to hostname, and user to our_name */
479 if (our_name[0] == 0 || usehostname)
480 strcpy(our_name, hostname);
482 strcpy(user, our_name);
484 /* If authentication is required, ask peer for CHAP or PAP. */
485 if (auth_required && !wo->neg_chap && !wo->neg_upap) {
491 * Check whether we have appropriate secrets to use
492 * to authenticate the peer.
494 can_auth = wo->neg_upap && (uselogin || have_pap_secret());
495 if (!can_auth && wo->neg_chap) {
496 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
497 can_auth = have_chap_secret(remote_name, our_name, remote);
500 if (auth_required && !can_auth) {
501 option_error("peer authentication required but no suitable secret(s) found\n");
506 * Check whether the user tried to override certain values
509 if (!auth_required && auth_req_info.priv > 0) {
510 if (!default_device && devnam_info.priv == 0) {
511 option_error("can't override device name when noauth option used");
514 if (connector != NULL && connector_info.priv == 0
515 || disconnector != NULL && disconnector_info.priv == 0
516 || welcomer != NULL && welcomer_info.priv == 0) {
517 option_error("can't override connect, disconnect or welcome");
518 option_error("option values when noauth option used");
525 * auth_reset - called when LCP is starting negotiations to recheck
526 * authentication options, i.e. whether we have appropriate secrets
527 * to use for authenticating ourselves and/or the peer.
533 lcp_options *go = &lcp_gotoptions[unit];
534 lcp_options *ao = &lcp_allowoptions[0];
535 ipcp_options *ipwo = &ipcp_wantoptions[0];
538 ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
539 ao->neg_chap = !refuse_chap
540 && have_chap_secret(user, remote_name, (u_int32_t)0);
542 if (go->neg_upap && !uselogin && !have_pap_secret())
545 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
546 if (!have_chap_secret(remote_name, our_name, remote))
554 * check_passwd - Check the user name and passwd against the PAP secrets
555 * file. If requested, also check against the system password database,
556 * and login the user if OK.
559 * UPAP_AUTHNAK: Authentication failed.
560 * UPAP_AUTHACK: Authentication succeeded.
561 * In either case, msg points to an appropriate message.
564 check_passwd(unit, auser, userlen, apasswd, passwdlen, msg, msglen)
576 struct wordlist *addrs;
578 ipcp_options *ipwo = &ipcp_wantoptions[unit];
579 char passwd[256], user[256];
580 char secret[MAXWORDLEN];
581 static int attempts = 0;
584 * Make copies of apasswd and auser, then null-terminate them.
586 BCOPY(apasswd, passwd, passwdlen);
587 passwd[passwdlen] = '\0';
588 BCOPY(auser, user, userlen);
589 user[userlen] = '\0';
593 * Open the file of pap secrets and scan for a suitable secret
594 * for authenticating this user.
596 filename = _PATH_UPAPFILE;
599 f = fopen(filename, "r");
602 syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
607 check_access(f, filename);
608 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
609 if (scan_authfile(f, user, our_name, remote,
610 secret, &addrs, filename) < 0
611 || (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
612 && strcmp(crypt(passwd, secret), secret) != 0)) {
613 syslog(LOG_WARNING, "PAP authentication failure for %s", user);
619 if (uselogin && ret == UPAP_AUTHACK) {
620 ret = login(user, passwd, msg, msglen);
621 if (ret == UPAP_AUTHNAK) {
622 syslog(LOG_WARNING, "PAP login failure for %s", user);
626 if (ret == UPAP_AUTHNAK) {
627 if (*msg == (char *) 0)
628 *msg = "Login incorrect";
629 *msglen = strlen(*msg);
631 * Frustrate passwd stealer programs.
632 * Allow 10 tries, but start backing off after 3 (stolen from login).
633 * On 10'th, drop the connection.
635 if (attempts++ >= 10) {
636 syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
637 attempts, devnam, user);
641 sleep((u_int) (attempts - 3) * 5);
643 free_wordlist(addrs);
646 attempts = 0; /* Reset count */
647 if (*msg == (char *) 0)
649 *msglen = strlen(*msg);
650 if (addresses[unit] != NULL)
651 free_wordlist(addresses[unit]);
652 addresses[unit] = addrs;
655 BZERO(passwd, sizeof(passwd));
656 BZERO(secret, sizeof(secret));
663 * This function was lifted from the shadow-3.3.2 version by John Haugh II.
664 * It is included because the function was not in the standard libshadow
665 * library. If it is included in the library then I can remove it from here.
668 #define DAY (24L*3600L)
670 * isexpired - determine if account is expired yet
672 * isexpired calculates the expiration date based on the
673 * password expiration criteria.
684 clock = time ((time_t *) 0) / DAY;
687 * Quick and easy - there is an expired account field
688 * along with an inactive account field. Do the expired
689 * one first since it is worse.
692 if (sp->sp_expire > 0 && sp->sp_expire < clock)
695 if (sp->sp_inact > 0 && sp->sp_lstchg > 0 && sp->sp_max > 0 &&
696 sp->sp_inact + sp->sp_lstchg + sp->sp_max < clock)
700 * The last and max fields must be present for an account
701 * to have an expired password. A maximum of >10000 days
702 * is considered to be infinite.
705 if (sp->sp_lstchg == -1 ||
706 sp->sp_max == -1 || sp->sp_max >= 10000L)
710 * Calculate today's day and the day on which the password
711 * is going to expire. If that date has already passed,
712 * the password has expired.
715 if (sp->sp_lstchg + sp->sp_max < clock)
724 * This function is needed for PAM. However, it should not be called.
725 * If it is, return the error code.
729 static int pam_conv(int num_msg, const struct pam_message **msg,
730 struct pam_response **resp, void *appdata_ptr)
737 * login - Check the user name and password against the system
738 * password database, and login the user if OK.
741 * UPAP_AUTHNAK: Login failed.
742 * UPAP_AUTHACK: Login succeeded.
743 * In either case, msg points to an appropriate message.
747 login(user, passwd, msg, msglen)
756 struct pam_conv pam_conversation;
762 * Fill the pam_conversion structure
764 memset (&pam_conversation, '\0', sizeof (struct pam_conv));
765 pam_conversation.conv = &pam_conv;
767 pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
768 if (pam_error != PAM_SUCCESS) {
769 *msg = (char *) pam_strerror (pam_error);
773 * Define the fields for the credintial validation
775 (void) pam_set_item (pamh, PAM_AUTHTOK, passwd);
776 (void) pam_set_item (pamh, PAM_TTY, devnam);
780 pam_error = pam_authenticate (pamh, PAM_SILENT);
781 if (pam_error == PAM_SUCCESS)
782 pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
784 *msg = (char *) pam_strerror (pam_error);
788 (void) pam_end (pamh, pam_error);
790 if (pam_error != PAM_SUCCESS)
793 * Use the non-PAM methods directly
795 #else /* #ifdef USE_PAM */
802 struct spwd *getspnam();
805 if ((pw = getpwnam(user)) == NULL) {
806 return (UPAP_AUTHNAK);
810 if ((spwd = getspnam(user)) == NULL) {
813 pw->pw_passwd = spwd->sp_pwdp;
818 * XXX If no passwd, let them login without one.
820 if (pw->pw_passwd == '\0') {
821 return (UPAP_AUTHACK);
826 if (pw->pw_passwd[0] == '@') {
827 if (pw_auth (pw->pw_passwd+1, pw->pw_name, PW_PPP, NULL)) {
828 return (UPAP_AUTHNAK);
831 epasswd = pw_encrypt(passwd, pw->pw_passwd);
832 if (strcmp(epasswd, pw->pw_passwd)) {
833 return (UPAP_AUTHNAK);
836 /* check the age of the password entry */
837 if (spwd && (isexpired (pw, spwd) != 0)) {
838 return (UPAP_AUTHNAK);
842 epasswd = crypt(passwd, pw->pw_passwd);
843 if (strcmp(epasswd, pw->pw_passwd)) {
844 return (UPAP_AUTHNAK);
847 #endif /* #ifdef USE_PAM */
849 syslog(LOG_INFO, "user %s logged in", user);
852 * Write a wtmp entry for this user.
855 if (strncmp(tty, "/dev/", 5) == 0)
857 logwtmp(tty, user, remote_name); /* Add wtmp login entry */
860 return (UPAP_AUTHACK);
864 * logout - Logout the user.
872 if (strncmp(tty, "/dev/", 5) == 0)
874 logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
880 * null_login - Check if a username of "" and a password of "" are
881 * acceptable, and iff so, set the list of acceptable IP addresses
891 struct wordlist *addrs;
892 char secret[MAXWORDLEN];
895 * Open the file of pap secrets and scan for a suitable secret.
896 * We don't accept a wildcard client.
898 filename = _PATH_UPAPFILE;
900 f = fopen(filename, "r");
903 check_access(f, filename);
905 i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
906 ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
907 BZERO(secret, sizeof(secret));
910 if (addresses[unit] != NULL)
911 free_wordlist(addresses[unit]);
912 addresses[unit] = addrs;
921 * get_pap_passwd - get a password for authenticating ourselves with
922 * our peer using PAP. Returns 1 on success, 0 if no suitable password
926 get_pap_passwd(char *passwd)
930 struct wordlist *addrs;
931 char secret[MAXWORDLEN];
933 filename = _PATH_UPAPFILE;
935 f = fopen(filename, "r");
938 check_access(f, filename);
939 if (scan_authfile(f, user,
940 remote_name[0]? remote_name: NULL,
941 (u_int32_t)0, secret, NULL, filename) < 0)
943 if (passwd != NULL) {
944 strncpy(passwd, secret, MAXSECRETLEN);
945 passwd[MAXSECRETLEN-1] = 0;
947 BZERO(secret, sizeof(secret));
953 * have_pap_secret - check whether we have a PAP file with any
954 * secrets that we could possibly use for authenticating the peer.
962 ipcp_options *ipwo = &ipcp_wantoptions[0];
965 filename = _PATH_UPAPFILE;
966 f = fopen(filename, "r");
970 remote = ipwo->accept_remote? 0: ipwo->hisaddr;
971 ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
981 * have_chap_secret - check whether we have a CHAP file with a
982 * secret that we could possibly use for authenticating `client'
983 * on `server'. Either can be the null string, meaning we don't
984 * know the identity yet.
987 have_chap_secret(client, server, remote)
996 filename = _PATH_CHAPFILE;
997 f = fopen(filename, "r");
1003 else if (server[0] == 0)
1006 ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
1016 * get_secret - open the CHAP secret file and return the secret
1017 * for authenticating the given client on the given server.
1018 * (We could be either client or server).
1021 get_secret(unit, client, server, secret, secret_len, save_addrs)
1032 struct wordlist *addrs;
1033 char secbuf[MAXWORDLEN];
1035 filename = _PATH_CHAPFILE;
1039 f = fopen(filename, "r");
1041 syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
1044 check_access(f, filename);
1046 ret = scan_authfile(f, client, server, (u_int32_t)0,
1047 secbuf, &addrs, filename);
1053 if (addresses[unit] != NULL)
1054 free_wordlist(addresses[unit]);
1055 addresses[unit] = addrs;
1058 len = strlen(secbuf);
1059 if (len > MAXSECRETLEN) {
1060 syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
1063 BCOPY(secbuf, secret, len);
1064 BZERO(secbuf, sizeof(secbuf));
1071 * auth_ip_addr - check whether the peer is authorized to use
1072 * a given IP address. Returns 1 if authorized, 0 otherwise.
1075 auth_ip_addr(unit, addr)
1079 return ip_addr_check(addr, addresses[unit]);
1083 ip_addr_check(addr, addrs)
1085 struct wordlist *addrs;
1087 u_int32_t a, mask, ah;
1089 char *ptr_word, *ptr_mask;
1093 /* don't allow loopback or multicast address */
1094 if (bad_ip_adrs(addr))
1098 return 1; /* no restriction */
1100 for (; addrs != NULL; addrs = addrs->next) {
1101 /* "-" means no addresses authorized */
1102 ptr_word = addrs->word;
1103 if (strcmp(ptr_word, "-") == 0)
1107 if (*ptr_word == '!') {
1112 mask = ~ (u_int32_t) 0;
1113 ptr_mask = strchr (ptr_word, '/');
1114 if (ptr_mask != NULL) {
1117 bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
1118 if (bit_count <= 0 || bit_count > 32) {
1119 syslog (LOG_WARNING,
1120 "invalid address length %s in auth. address list",
1125 mask <<= 32 - bit_count;
1128 hp = gethostbyname(ptr_word);
1129 if (hp != NULL && hp->h_addrtype == AF_INET) {
1130 a = *(u_int32_t *)hp->h_addr;
1131 mask = ~ (u_int32_t) 0; /* are we sure we want this? */
1133 np = getnetbyname (ptr_word);
1134 if (np != NULL && np->n_addrtype == AF_INET)
1135 a = htonl (*(u_int32_t *)np->n_net);
1137 a = inet_addr (ptr_word);
1138 if (ptr_mask == NULL) {
1139 /* calculate appropriate mask for net */
1142 mask = IN_CLASSA_NET;
1143 else if (IN_CLASSB(ah))
1144 mask = IN_CLASSB_NET;
1145 else if (IN_CLASSC(ah))
1146 mask = IN_CLASSC_NET;
1150 if (ptr_mask != NULL)
1154 syslog (LOG_WARNING,
1155 "unknown host %s in auth. address list",
1158 if (((addr ^ a) & htonl(mask)) == 0)
1161 return 0; /* not in list => can't have it */
1165 * bad_ip_adrs - return 1 if the IP address is one we don't want
1166 * to use, such as an address in the loopback net or a multicast address.
1167 * addr is in network byte order.
1174 return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1175 || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1179 * check_access - complain if a secret file has too-liberal permissions.
1182 check_access(f, filename)
1188 if (fstat(fileno(f), &sbuf) < 0) {
1189 syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
1190 } else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
1191 syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
1197 * scan_authfile - Scan an authorization file for a secret suitable
1198 * for authenticating `client' on `server'. The return value is -1
1199 * if no secret is found, otherwise >= 0. The return value has
1200 * NONWILD_CLIENT set if the secret didn't have "*" for the client, and
1201 * NONWILD_SERVER set if the secret didn't have "*" for the server.
1202 * Any following words on the line (i.e. address authorization
1203 * info) are placed in a wordlist and returned in *addrs.
1206 scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
1212 struct wordlist **addrs;
1216 int got_flag, best_flag;
1218 struct wordlist *ap, *addr_list, *alist, *alast;
1219 char word[MAXWORDLEN];
1220 char atfile[MAXWORDLEN];
1221 char lsecret[MAXWORDLEN];
1226 if (!getword(f, word, &newline, filename))
1227 return -1; /* file is empty??? */
1232 * Skip until we find a word at the start of a line.
1234 while (!newline && getword(f, word, &newline, filename))
1237 break; /* got to end of file */
1240 * Got a client - check if it's a match or a wildcard.
1243 if (client != NULL && strcmp(word, client) != 0 && !ISWILD(word)) {
1248 got_flag = NONWILD_CLIENT;
1251 * Now get a server and check if it matches.
1253 if (!getword(f, word, &newline, filename))
1257 if (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
1260 got_flag |= NONWILD_SERVER;
1263 * Got some sort of a match - see if it's better than what
1266 if (got_flag <= best_flag)
1272 if (!getword(f, word, &newline, filename))
1278 * Special syntax: @filename means read secret from file.
1280 if (word[0] == '@') {
1281 strcpy(atfile, word+1);
1282 if ((sf = fopen(atfile, "r")) == NULL) {
1283 syslog(LOG_WARNING, "can't open indirect secret file %s",
1287 check_access(sf, atfile);
1288 if (!getword(sf, word, &xxx, atfile)) {
1289 syslog(LOG_WARNING, "no secret in indirect secret file %s",
1297 strcpy(lsecret, word);
1300 * Now read address authorization info and make a wordlist.
1302 alist = alast = NULL;
1304 if (!getword(f, word, &newline, filename) || newline)
1306 ap = (struct wordlist *) malloc(sizeof(struct wordlist)
1309 novm("authorized addresses");
1311 strcpy(ap->word, word);
1320 * Check if the given IP address is allowed by the wordlist.
1322 if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
1323 free_wordlist(alist);
1328 * This is the best so far; remember it.
1330 best_flag = got_flag;
1332 free_wordlist(addr_list);
1335 strcpy(secret, lsecret);
1343 else if (addr_list != NULL)
1344 free_wordlist(addr_list);
1350 * free_wordlist - release memory allocated for a wordlist.
1354 struct wordlist *wp;
1356 struct wordlist *next;
1358 while (wp != NULL) {
1366 * auth_script - execute a script with arguments
1367 * interface-name peer-name real-user tty speed
1379 if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
1380 user_name = pw->pw_name;
1382 sprintf(struid, "%d", getuid());
1385 sprintf(strspeed, "%d", baud_rate);
1389 argv[2] = peer_authname;
1390 argv[3] = user_name;
1395 run_program(script, argv, 0);