source: rtems/cpukit/pppd/auth.c @ 2f1b930

4.104.114.84.9
Last change on this file since 2f1b930 was 2f1b930, checked in by Joel Sherrill <joel.sherrill@…>, on Aug 16, 2001 at 8:42:09 PM

2001-08-16 Mike Siers <mikes@…>

  • Update of PPPD to 2.3.11 from 2.3.5 and addition of an example application. Mike's notes on the modifications:
    • renamed error() function because of namespace problems
    • removed calls to the exit() funciton
    • removed extra files from the pppd source directory
    • defined pppd task constant values in rtemspppd.h
    • modifyied example code to get actual tick per second value
    • placed the pppd 2.3.11 man page file (pppd.8) into the pppd directory
  • pppd/cbcp.c, pppd/cbcp.h, pppd/main.c, pppd/ppp_tty.c, pppd/pppmain.c, pppd/rtems-ppp.c, pppd/rtems-ppp.c: Deleted.
  • pppd/pppd.8, pppd/rtemsmain.c, pppd/rtemspppd.c, pppd/rtemspppd.h, pppd/sys-rtems.c, pppd/utils.c, pppd/example/Makefile, pppd/example/README, pppd/example/init.c, pppd/example/netconfig.h, pppd/example/ppp.conf, pppd/example/pppdapp.c, pppd/example/system.h: New files.
  • modem/ppp_tty.c, net/if_ppp.h, pppd/Makefile.am, pppd/README, pppd/STATUS, pppd/auth.c, pppd/ccp.c, pppd/ccp.h, pppd/chap.c, pppd/chap.h, pppd/chap_ms.c, pppd/chap_ms.h, pppd/chat.c, pppd/demand.c, pppd/fsm.c, pppd/fsm.h, pppd/ipcp.c, pppd/ipcp.h, pppd/ipxcp.c, pppd/ipxcp.h, pppd/lcp.c, pppd/lcp.h, pppd/magic.c, pppd/magic.h, pppd/options.c, pppd/patchlevel.h, pppd/pathnames.h, pppd/pppd.h, pppd/upap.c, pppd/upap.h: Modified.
  • Property mode set to 100644
File size: 26.8 KB
Line 
1/*
2 * auth.c - PPP authentication and phase control.
3 *
4 * Copyright (c) 1993 The Australian National University.
5 * All rights reserved.
6 *
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.
18 *
19 * Copyright (c) 1989 Carnegie Mellon University.
20 * All rights reserved.
21 *
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.
33 */
34
35#define RCSID   "$Id$"
36
37#include <stdio.h>
38#include <stddef.h>
39#include <stdlib.h>
40#include <unistd.h>
41#include <pwd.h>
42#include <grp.h>
43#include <string.h>
44#include <sys/types.h>
45#include <sys/stat.h>
46#include <sys/socket.h>
47#include <fcntl.h>
48#if defined(_PATH_LASTLOG) && defined(_linux_)
49#include <lastlog.h>
50#endif
51
52#include <netdb.h>
53#include <netinet/in.h>
54#include <arpa/inet.h>
55
56#ifdef USE_PAM
57#include <security/pam_appl.h>
58#endif
59
60#ifdef HAS_SHADOW
61#include <shadow.h>
62#ifndef PW_PPP
63#define PW_PPP PW_LOGIN
64#endif
65#endif
66
67#include "pppd.h"
68#include "fsm.h"
69#include "lcp.h"
70#include "ipcp.h"
71#include "upap.h"
72#include "chap.h"
73#ifdef CBCP_SUPPORT
74#include "cbcp.h"
75#endif
76#include "pathnames.h"
77
78static const char rcsid[] = RCSID;
79
80/* The name by which the peer authenticated itself to us. */
81char peer_authname[MAXNAMELEN];
82
83/* Records which authentication operations haven't completed yet. */
84static int auth_pending[NUM_PPP];
85
86/* List of addresses which the peer may use. */
87static struct permitted_ip *addresses[NUM_PPP];
88
89/* Wordlist giving addresses which the peer may use
90   without authenticating itself. */
91static struct wordlist *noauth_addrs;
92
93/* Extra options to apply, from the secrets file entry for the peer. */
94static struct wordlist *extra_options;
95
96/* Number of network protocols which we have opened. */
97static int num_np_open;
98
99/* Number of network protocols which have come up. */
100static int num_np_up;
101
102/* Set if we got the contents of passwd[] from the pap-secrets file. */
103static int passwd_from_file;
104
105/* Set if we require authentication only because we have a default route. */
106static bool default_auth;
107
108/* Hook for a link status */
109void (*auth_linkup_hook)__P((void)) = NULL;
110void (*auth_linkdown_hook)__P((void)) = NULL;
111
112/* Hook to enable a plugin to control the idle time limit */
113int (*idle_time_hook) __P((struct ppp_idle *)) = NULL;
114
115/* Hook for a plugin to say whether we can possibly authenticate any peer */
116int (*pap_check_hook) __P((void)) = NULL;
117
118/* Hook for a plugin to check the PAP user and password */
119int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
120                          struct wordlist **paddrs,
121                          struct wordlist **popts)) = NULL;
122
123/* Hook for a plugin to know about the PAP user logout */
124void (*pap_logout_hook) __P((void)) = NULL;
125
126/* Hook for a plugin to get the PAP password for authenticating us */
127int (*pap_passwd_hook) __P((char *user, char *passwd)) = NULL;
128
129/*
130 * This is used to ensure that we don't start an auth-up/down
131 * script while one is already running.
132 */
133enum script_state {
134    s_down,
135    s_up
136};
137
138static enum script_state auth_state = s_down;
139static enum script_state auth_script_state = s_down;
140
141/*
142 * Option variables.
143 */
144bool uselogin = 0;              /* Use /etc/passwd for checking PAP */
145bool cryptpap = 0;              /* Passwords in pap-secrets are encrypted */
146bool refuse_pap = 0;            /* Don't wanna auth. ourselves with PAP */
147bool refuse_chap = 0;           /* Don't wanna auth. ourselves with CHAP */
148bool usehostname = 0;           /* Use hostname for our_name */
149bool auth_required = 0;         /* Always require authentication from peer */
150bool allow_any_ip = 0;          /* Allow peer to use any IP address */
151bool explicit_remote = 0;       /* User specified explicit remote name */
152char remote_name[MAXNAMELEN];   /* Peer's name for authentication */
153
154/* Bits in auth_pending[] */
155#define PAP_WITHPEER    1
156#define PAP_PEER        2
157#define CHAP_WITHPEER   4
158#define CHAP_PEER       8
159
160extern char *crypt __P((const char *, const char *));
161
162/* Prototypes for procedures local to this file. */
163
164static void network_phase __P((int));
165static void check_idle __P((void *));
166static void connect_time_expired __P((void *));
167static int  null_login __P((int));
168static int  get_pap_passwd __P((char *));
169static int  have_pap_secret __P((int *));
170static int  have_chap_secret __P((char *, char *, int, int *));
171static int  ip_addr_check __P((u_int32_t, struct permitted_ip *));
172static void free_wordlist __P((struct wordlist *));
173static void auth_script __P((enum script_state s));
174static void set_allowed_addrs __P((int, struct wordlist *, struct wordlist *));
175
176
177/*
178 * Authentication-related options.
179 */
180option_t auth_options[] = {
181    { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
182      "Require PAP authentication from peer", 1, &auth_required },
183    { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
184      "Require PAP authentication from peer", 1, &auth_required },
185    { "refuse-pap", o_bool, &refuse_pap,
186      "Don't agree to auth to peer with PAP", 1 },
187    { "-pap", o_bool, &refuse_pap,
188      "Don't allow PAP authentication with peer", 1 },
189    { "require-chap", o_bool, &lcp_wantoptions[0].neg_chap,
190      "Require CHAP authentication from peer", 1, &auth_required },
191    { "+chap", o_bool, &lcp_wantoptions[0].neg_chap,
192      "Require CHAP authentication from peer", 1, &auth_required },
193    { "refuse-chap", o_bool, &refuse_chap,
194      "Don't agree to auth to peer with CHAP", 1 },
195    { "-chap", o_bool, &refuse_chap,
196      "Don't allow CHAP authentication with peer", 1 },
197    { "name", o_string, our_name,
198      "Set local name for authentication",
199      OPT_PRIV|OPT_STATIC, NULL, MAXNAMELEN },
200    { "user", o_string, user,
201      "Set name for auth with peer", OPT_STATIC, NULL, MAXNAMELEN },
202    { "usehostname", o_bool, &usehostname,
203      "Must use hostname for authentication", 1 },
204    { "remotename", o_string, remote_name,
205      "Set remote name for authentication", OPT_STATIC,
206      &explicit_remote, MAXNAMELEN },
207    { "auth", o_bool, &auth_required,
208      "Require authentication from peer", 1 },
209    { "noauth", o_bool, &auth_required,
210      "Don't require peer to authenticate", OPT_PRIV, &allow_any_ip },
211    {  "login", o_bool, &uselogin,
212      "Use system password database for PAP", 1 },
213    { "papcrypt", o_bool, &cryptpap,
214      "PAP passwords are encrypted", 1 },
215/* Removed for RTEMS PORT
216    { "+ua", o_special, setupapfile,
217      "Get PAP user and password from file" },
218*/
219    { "password", o_string, passwd,
220      "Password for authenticating us to the peer", OPT_STATIC,
221      NULL, MAXSECRETLEN },
222/* Removed for RTEMS_PORT
223    { "privgroup", o_special, privgroup,
224      "Allow group members to use privileged options", OPT_PRIV },
225    { "allow-ip", o_special, set_noauth_addr,
226      "Set IP address(es) which can be used without authentication",
227      OPT_PRIV },
228*/
229    { NULL }
230};
231
232/*
233 * An Open on LCP has requested a change from Dead to Establish phase.
234 * Do what's necessary to bring the physical layer up.
235 */
236void
237link_required(unit)
238    int unit;
239{
240}
241
242/*
243 * LCP has terminated the link; go to the Dead phase and take the
244 * physical layer down.
245 */
246void
247link_terminated(unit)
248    int unit;
249{
250    if (phase == PHASE_DEAD)
251        return;
252    if (pap_logout_hook) {
253        pap_logout_hook();
254    }
255    new_phase(PHASE_DEAD);
256    notice("Connection terminated.");
257}
258
259/*
260 * LCP has gone down; it will either die or try to re-establish.
261 */
262void
263link_down(unit)
264    int unit;
265{
266    int i;
267    struct protent *protp;
268
269    auth_state = s_down;
270    if (auth_script_state == s_up) {
271        update_link_stats(unit);
272        auth_script(s_down);
273    }
274    for (i = 0; (protp = protocols[i]) != NULL; ++i) {
275        if (!protp->enabled_flag)
276            continue;
277        if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
278            (*protp->lowerdown)(unit);
279        if (protp->protocol < 0xC000 && protp->close != NULL)
280            (*protp->close)(unit, "LCP down");
281    }
282    num_np_open = 0;
283    num_np_up = 0;
284    if (phase != PHASE_DEAD)
285        new_phase(PHASE_TERMINATE);
286}
287
288/*
289 * The link is established.
290 * Proceed to the Dead, Authenticate or Network phase as appropriate.
291 */
292void
293link_established(unit)
294    int unit;
295{
296    int auth;
297    lcp_options *wo = &lcp_wantoptions[unit];
298    lcp_options *go = &lcp_gotoptions[unit];
299    lcp_options *ho = &lcp_hisoptions[unit];
300    int i;
301    struct protent *protp;
302
303    /*
304     * Tell higher-level protocols that LCP is up.
305     */
306    for (i = 0; (protp = protocols[i]) != NULL; ++i)
307        if (protp->protocol != PPP_LCP && protp->enabled_flag
308            && protp->lowerup != NULL)
309            (*protp->lowerup)(unit);
310
311    if (auth_required && !(go->neg_chap || go->neg_upap)) {
312        /*
313         * We wanted the peer to authenticate itself, and it refused:
314         * if we have some address(es) it can use without auth, fine,
315         * otherwise treat it as though it authenticated with PAP using
316         * a username * of "" and a password of "".  If that's not OK,
317         * boot it out.
318         */
319        if (noauth_addrs != NULL) {
320            set_allowed_addrs(unit, noauth_addrs, NULL);
321        } else if (!wo->neg_upap || !null_login(unit)) {
322            warn("peer refused to authenticate: terminating link");
323            lcp_close(unit, "peer refused to authenticate");
324            status = EXIT_PEER_AUTH_FAILED;
325            return;
326        }
327    }
328
329    new_phase(PHASE_AUTHENTICATE);
330    auth = 0;
331    if (go->neg_chap) {
332        ChapAuthPeer(unit, our_name, go->chap_mdtype);
333        auth |= CHAP_PEER;
334    } else if (go->neg_upap) {
335        upap_authpeer(unit);
336        auth |= PAP_PEER;
337    }
338    if (ho->neg_chap) {
339        ChapAuthWithPeer(unit, user, ho->chap_mdtype);
340        auth |= CHAP_WITHPEER;
341    } else if (ho->neg_upap) {
342        if (passwd[0] == 0) {
343            passwd_from_file = 1;
344            if (!get_pap_passwd(passwd))
345                error("No secret found for PAP login");
346        }
347        upap_authwithpeer(unit, user, passwd);
348        auth |= PAP_WITHPEER;
349    }
350    auth_pending[unit] = auth;
351
352    if (!auth)
353        network_phase(unit);
354}
355
356/*
357 * Proceed to the network phase.
358 */
359static void
360network_phase(unit)
361    int unit;
362{
363#ifdef CBCP_SUPPORT
364    lcp_options *go = &lcp_gotoptions[unit];
365#endif
366
367    /* always run the auth-up script */
368    auth_state = s_up;
369    if (auth_script_state == s_down) {
370        auth_script(s_up);
371    }
372
373#ifdef CBCP_SUPPORT
374    /*
375     * If we negotiated callback, do it now.
376     */
377    if (go->neg_cbcp) {
378        new_phase(PHASE_CALLBACK);
379        (*cbcp_protent.open)(unit);
380        return;
381    }
382#endif
383
384    /*
385     * Process extra options from the secrets file
386     */
387    if (extra_options) {
388        options_from_list(extra_options, 1);
389        free_wordlist(extra_options);
390        extra_options = 0;
391    }
392    start_networks();
393}
394
395void
396start_networks()
397{
398    int i;
399    struct protent *protp;
400
401    new_phase(PHASE_NETWORK);
402    for (i = 0; (protp = protocols[i]) != NULL; ++i)
403        if (protp->protocol < 0xC000 && protp->enabled_flag
404            && protp->open != NULL) {
405            (*protp->open)(0);
406            if (protp->protocol != PPP_CCP)
407                ++num_np_open;
408        }
409
410    if (num_np_open == 0)
411        /* nothing to do */
412        lcp_close(0, "No network protocols running");
413}
414
415/*
416 * The peer has failed to authenticate himself using `protocol'.
417 */
418void
419auth_peer_fail(unit, protocol)
420    int unit, protocol;
421{
422    /*
423     * Authentication failure: take the link down
424     */
425    lcp_close(unit, "Authentication failed");
426    status = EXIT_PEER_AUTH_FAILED;
427}
428
429/*
430 * The peer has been successfully authenticated using `protocol'.
431 */
432void
433auth_peer_success(unit, protocol, name, namelen)
434    int unit, protocol;
435    char *name;
436    int namelen;
437{
438    int bit;
439
440    switch (protocol) {
441    case PPP_CHAP:
442        bit = CHAP_PEER;
443        break;
444    case PPP_PAP:
445        bit = PAP_PEER;
446        break;
447    default:
448        warn("auth_peer_success: unknown protocol %x", protocol);
449        return;
450    }
451
452    /*
453     * Save the authenticated name of the peer for later.
454     */
455    if (namelen > sizeof(peer_authname) - 1)
456        namelen = sizeof(peer_authname) - 1;
457    BCOPY(name, peer_authname, namelen);
458    peer_authname[namelen] = 0;
459
460    /*
461     * If there is no more authentication still to be done,
462     * proceed to the network (or callback) phase.
463     */
464    if ((auth_pending[unit] &= ~bit) == 0)
465        network_phase(unit);
466}
467
468/*
469 * We have failed to authenticate ourselves to the peer using `protocol'.
470 */
471void
472auth_withpeer_fail(unit, protocol)
473    int unit, protocol;
474{
475    if (passwd_from_file)
476        BZERO(passwd, MAXSECRETLEN);
477    /*
478     * We've failed to authenticate ourselves to our peer.
479     * Some servers keep sending CHAP challenges, but there
480     * is no point in persisting without any way to get updated
481     * authentication secrets.
482     */
483    lcp_close(unit, "Failed to authenticate ourselves to peer");
484    status = EXIT_AUTH_TOPEER_FAILED;
485}
486
487/*
488 * We have successfully authenticated ourselves with the peer using `protocol'.
489 */
490void
491auth_withpeer_success(unit, protocol)
492    int unit, protocol;
493{
494    int bit;
495
496    switch (protocol) {
497    case PPP_CHAP:
498        bit = CHAP_WITHPEER;
499        break;
500    case PPP_PAP:
501        if (passwd_from_file)
502            BZERO(passwd, MAXSECRETLEN);
503        bit = PAP_WITHPEER;
504        break;
505    default:
506        warn("auth_withpeer_success: unknown protocol %x", protocol);
507        bit = 0;
508    }
509
510    /*
511     * If there is no more authentication still being done,
512     * proceed to the network (or callback) phase.
513     */
514    if ((auth_pending[unit] &= ~bit) == 0)
515        network_phase(unit);
516}
517
518
519/*
520 * np_up - a network protocol has come up.
521 */
522void
523np_up(unit, proto)
524    int unit, proto;
525{
526    int tlim;
527
528    if (num_np_up == 0) {
529        /*
530         * At this point we consider that the link has come up successfully.
531         */
532        status = EXIT_OK;
533        unsuccess = 0;
534        new_phase(PHASE_RUNNING);
535
536        if (idle_time_hook != 0)
537            tlim = (*idle_time_hook)(NULL);
538        else
539            tlim = idle_time_limit;
540        if (tlim > 0)
541            TIMEOUT(check_idle, NULL, tlim);
542
543        /*
544         * Set a timeout to close the connection once the maximum
545         * connect time has expired.
546         */
547        if (maxconnect > 0)
548            TIMEOUT(connect_time_expired, 0, maxconnect);
549    }
550    ++num_np_up;
551}
552
553/*
554 * np_down - a network protocol has gone down.
555 */
556void
557np_down(unit, proto)
558    int unit, proto;
559{
560    if (--num_np_up == 0) {
561        UNTIMEOUT(check_idle, NULL);
562        new_phase(PHASE_NETWORK);
563    }
564}
565
566/*
567 * np_finished - a network protocol has finished using the link.
568 */
569void
570np_finished(unit, proto)
571    int unit, proto;
572{
573    if (--num_np_open <= 0) {
574        /* no further use for the link: shut up shop. */
575        lcp_close(0, "No network protocols running");
576    }
577}
578
579/*
580 * check_idle - check whether the link has been idle for long
581 * enough that we can shut it down.
582 */
583static void
584check_idle(arg)
585    void *arg;
586{
587    struct ppp_idle idle;
588    time_t itime;
589    int tlim;
590
591    if (!get_idle_time(0, &idle))
592        return;
593    if (idle_time_hook != 0) {
594        tlim = idle_time_hook(&idle);
595    } else {
596        itime = MIN(idle.xmit_idle, idle.recv_idle);
597        tlim = idle_time_limit - itime;
598    }
599    if (tlim <= 0) {
600        /* link is idle: shut it down. */
601        notice("Terminating connection due to lack of activity.");
602        lcp_close(0, "Link inactive");
603        need_holdoff = 0;
604        status = EXIT_IDLE_TIMEOUT;
605    } else {
606        TIMEOUT(check_idle, NULL, tlim);
607    }
608}
609
610/*
611 * connect_time_expired - log a message and close the connection.
612 */
613static void
614connect_time_expired(arg)
615    void *arg;
616{
617    info("Connect time expired");
618    lcp_close(0, "Connect time expired");       /* Close connection */
619    status = EXIT_CONNECT_TIME;
620}
621
622/*
623 * auth_check_options - called to check authentication options.
624 */
625int
626auth_check_options()
627{
628    lcp_options *wo = &lcp_wantoptions[0];
629    int status      = 1;
630    int can_auth;
631    int lacks_ip;
632
633    /* Default our_name to hostname, and user to our_name */
634    if (our_name[0] == 0 || usehostname)
635        strlcpy(our_name, hostname, sizeof(our_name));
636    if (user[0] == 0)
637        strlcpy(user, our_name, sizeof(user));
638
639    /*
640     * If we have a default route, require the peer to authenticate
641     * unless the noauth option was given or the real user is root.
642     */
643    if (!auth_required && !allow_any_ip && have_route_to(0) && !privileged) {
644        printf("auth_check_options: turning on\n");
645        auth_required = 1;
646        default_auth = 1;
647    }
648
649    /* If authentication is required, ask peer for CHAP or PAP. */
650    if (auth_required) {
651        if (!wo->neg_chap && !wo->neg_upap) {
652            wo->neg_chap = 1;
653            wo->neg_upap = 1;
654        }
655    } else {
656        wo->neg_chap = 0;
657        wo->neg_upap = 0;
658    }
659
660    /*
661     * Check whether we have appropriate secrets to use
662     * to authenticate the peer.
663     */
664    lacks_ip = 0;
665    can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
666    if (!can_auth && wo->neg_chap) {
667        can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
668                                    our_name, 1, &lacks_ip);
669    }
670
671    if (auth_required && !can_auth && noauth_addrs == NULL) {
672        if (default_auth) {
673            option_error(
674"By default the remote system is required to authenticate itself");
675            option_error(
676"(because this system has a default route to the internet)");
677        } else if (explicit_remote)
678            option_error(
679"The remote system (%s) is required to authenticate itself",
680                         remote_name);
681        else
682            option_error(
683"The remote system is required to authenticate itself");
684        option_error(
685"but I couldn't find any suitable secret (password) for it to use to do so.");
686        if (lacks_ip)
687            option_error(
688"(None of the available passwords would let it use an IP address.)");
689
690        status = 0;
691    }
692    return ( status );
693}
694
695/*
696 * auth_reset - called when LCP is starting negotiations to recheck
697 * authentication options, i.e. whether we have appropriate secrets
698 * to use for authenticating ourselves and/or the peer.
699 */
700void
701auth_reset(unit)
702    int unit;
703{
704    lcp_options *go = &lcp_gotoptions[unit];
705    lcp_options *ao = &lcp_allowoptions[0];
706
707    ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
708    ao->neg_chap = !refuse_chap
709        && (passwd[0] != 0
710            || have_chap_secret(user, (explicit_remote? remote_name: NULL),
711                                0, NULL));
712
713    if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
714        go->neg_upap = 0;
715    if (go->neg_chap) {
716        if (!have_chap_secret((explicit_remote? remote_name: NULL),
717                              our_name, 1, NULL))
718            go->neg_chap = 0;
719    }
720}
721
722
723/*
724 * check_passwd - Check the user name and passwd against the PAP secrets
725 * file.  If requested, also check against the system password database,
726 * and login the user if OK.
727 *
728 * returns:
729 *      UPAP_AUTHNAK: Authentication failed.
730 *      UPAP_AUTHACK: Authentication succeeded.
731 * In either case, msg points to an appropriate message.
732 */
733int
734check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
735    int unit;
736    char *auser;
737    int userlen;
738    char *apasswd;
739    int passwdlen;
740    char **msg;
741{
742    int    ret = (int)UPAP_AUTHNAK;
743
744    if (( userlen == 0 ) && ( passwdlen == 0 )) {
745      ret = (int)UPAP_AUTHACK;
746    }
747    printf("check_passwd: %d\n", ret);
748
749    return ret;
750}
751
752/*
753 * null_login - Check if a username of "" and a password of "" are
754 * acceptable, and iff so, set the list of acceptable IP addresses
755 * and return 1.
756 */
757static int
758null_login(unit)
759    int unit;
760{
761    return 0;
762}
763
764
765/*
766 * get_pap_passwd - get a password for authenticating ourselves with
767 * our peer using PAP.  Returns 1 on success, 0 if no suitable password
768 * could be found.
769 * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
770 */
771static int
772get_pap_passwd(passwd)
773    char *passwd;
774{
775    int ret = (int)0;
776
777    /*
778     * Check whether a plugin wants to supply this.
779     */
780    if (pap_passwd_hook) {
781        ret = (*pap_passwd_hook)(user, passwd);
782    }
783
784    return ( ret );
785}
786
787
788/*
789 * have_pap_secret - check whether we have a PAP file with any
790 * secrets that we could possibly use for authenticating the peer.
791 */
792static int
793have_pap_secret(lacks_ipp)
794    int *lacks_ipp;
795{
796    int ret = (int)0;
797
798    /* let the plugin decide, if there is one */
799    printf("have_pap_secret:\n");
800    if (pap_check_hook) {
801        ret = (*pap_check_hook)();
802    }
803
804    return ( ret );
805}
806
807
808/*
809 * have_chap_secret - check whether we have a CHAP file with a
810 * secret that we could possibly use for authenticating `client'
811 * on `server'.  Either can be the null string, meaning we don't
812 * know the identity yet.
813 */
814static int
815have_chap_secret(client, server, need_ip, lacks_ipp)
816    char *client;
817    char *server;
818    int need_ip;
819    int *lacks_ipp;
820{
821    return 0;
822}
823
824
825/*
826 * get_secret - open the CHAP secret file and return the secret
827 * for authenticating the given client on the given server.
828 * (We could be either client or server).
829 */
830int
831get_secret(unit, client, server, secret, secret_len, am_server)
832    int unit;
833    char *client;
834    char *server;
835    char *secret;
836    int *secret_len;
837    int am_server;
838{
839    int len;
840    char secbuf[MAXWORDLEN];
841
842    if (!am_server && passwd[0] != 0) {
843        strlcpy(secbuf, passwd, sizeof(secbuf));
844    } else {
845        return 0;
846    }
847
848    len = strlen(secbuf);
849    if (len > MAXSECRETLEN) {
850        error("Secret for %s on %s is too long", client, server);
851        len = MAXSECRETLEN;
852    }
853    BCOPY(secbuf, secret, len);
854    BZERO(secbuf, sizeof(secbuf));
855    *secret_len = len;
856
857    return 1;
858}
859
860/*
861 * set_allowed_addrs() - set the list of allowed addresses.
862 * Also looks for `--' indicating options to apply for this peer
863 * and leaves the following words in extra_options.
864 */
865static void
866set_allowed_addrs(unit, addrs, opts)
867    int unit;
868    struct wordlist *addrs;
869    struct wordlist *opts;
870{
871    int n;
872    struct wordlist *ap, **pap;
873    struct permitted_ip *ip;
874    char *ptr_word, *ptr_mask;
875    struct hostent *hp;
876    struct netent *np;
877    u_int32_t a, mask, ah, offset;
878    struct ipcp_options *wo = &ipcp_wantoptions[unit];
879    u_int32_t suggested_ip = 0;
880
881    if (addresses[unit] != NULL)
882        free(addresses[unit]);
883    addresses[unit] = NULL;
884    if (extra_options != NULL)
885        free_wordlist(extra_options);
886    extra_options = opts;
887
888    /*
889     * Count the number of IP addresses given.
890     */
891    for (n = 0, pap = &addrs; (ap = *pap) != NULL; pap = &ap->next)
892        ++n;
893    if (n == 0)
894        return;
895    ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
896    if (ip == 0)
897        return;
898
899    n = 0;
900    for (ap = addrs; ap != NULL; ap = ap->next) {
901        /* "-" means no addresses authorized, "*" means any address allowed */
902        ptr_word = ap->word;
903        if (strcmp(ptr_word, "-") == 0)
904            break;
905        if (strcmp(ptr_word, "*") == 0) {
906            ip[n].permit = 1;
907            ip[n].base = ip[n].mask = 0;
908            ++n;
909            break;
910        }
911
912        ip[n].permit = 1;
913        if (*ptr_word == '!') {
914            ip[n].permit = 0;
915            ++ptr_word;
916        }
917
918        mask = ~ (u_int32_t) 0;
919        offset = 0;
920        ptr_mask = strchr (ptr_word, '/');
921        if (ptr_mask != NULL) {
922            int bit_count;
923            char *endp;
924
925            bit_count = (int) strtol (ptr_mask+1, &endp, 10);
926            if (bit_count <= 0 || bit_count > 32) {
927                warn("invalid address length %v in auth. address list",
928                     ptr_mask+1);
929                continue;
930            }
931            bit_count = 32 - bit_count; /* # bits in host part */
932            if (*endp == '+') {
933                offset = pppifunit + 1;
934                ++endp;
935            }
936            if (*endp != 0) {
937                warn("invalid address length syntax: %v", ptr_mask+1);
938                continue;
939            }
940            *ptr_mask = '\0';
941            mask <<= bit_count;
942        }
943
944        hp = gethostbyname(ptr_word);
945        if (hp != NULL && hp->h_addrtype == AF_INET) {
946            a = *(u_int32_t *)hp->h_addr;
947        } else {
948            np = getnetbyname (ptr_word);
949            if (np != NULL && np->n_addrtype == AF_INET) {
950                a = htonl (*(u_int32_t *)np->n_net);
951                if (ptr_mask == NULL) {
952                    /* calculate appropriate mask for net */
953                    ah = ntohl(a);
954                    if (IN_CLASSA(ah))
955                        mask = IN_CLASSA_NET;
956                    else if (IN_CLASSB(ah))
957                        mask = IN_CLASSB_NET;
958                    else if (IN_CLASSC(ah))
959                        mask = IN_CLASSC_NET;
960                }
961            } else {
962                a = inet_addr (ptr_word);
963            }
964        }
965
966        if (ptr_mask != NULL)
967            *ptr_mask = '/';
968
969        if (a == (u_int32_t)-1L) {
970            warn("unknown host %s in auth. address list", ap->word);
971            continue;
972        }
973        if (offset != 0) {
974            if (offset >= ~mask) {
975                warn("interface unit %d too large for subnet %v",
976                     pppifunit, ptr_word);
977                continue;
978            }
979            a = htonl((ntohl(a) & mask) + offset);
980            mask = ~(u_int32_t)0;
981        }
982        ip[n].mask = htonl(mask);
983        ip[n].base = a & ip[n].mask;
984        ++n;
985        if (~mask == 0 && suggested_ip == 0)
986            suggested_ip = a;
987    }
988
989    ip[n].permit = 0;           /* make the last entry forbid all addresses */
990    ip[n].base = 0;             /* to terminate the list */
991    ip[n].mask = 0;
992
993    addresses[unit] = ip;
994
995    /*
996     * If the address given for the peer isn't authorized, or if
997     * the user hasn't given one, AND there is an authorized address
998     * which is a single host, then use that if we find one.
999     */
1000    if (suggested_ip != 0
1001        && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr)))
1002        wo->hisaddr = suggested_ip;
1003}
1004
1005/*
1006 * auth_ip_addr - check whether the peer is authorized to use
1007 * a given IP address.  Returns 1 if authorized, 0 otherwise.
1008 */
1009int
1010auth_ip_addr(unit, addr)
1011    int unit;
1012    u_int32_t addr;
1013{
1014    int ok;
1015
1016    /* don't allow loopback or multicast address */
1017    if (bad_ip_adrs(addr))
1018        return 0;
1019
1020    if (addresses[unit] != NULL) {
1021        ok = ip_addr_check(addr, addresses[unit]);
1022        if (ok >= 0)
1023            return ok;
1024    }
1025    if (auth_required)
1026        return 0;               /* no addresses authorized */
1027    return allow_any_ip || !have_route_to(addr);
1028}
1029
1030static int
1031ip_addr_check(addr, addrs)
1032    u_int32_t addr;
1033    struct permitted_ip *addrs;
1034{
1035    for (; ; ++addrs)
1036        if ((addr & addrs->mask) == addrs->base)
1037            return addrs->permit;
1038}
1039
1040/*
1041 * bad_ip_adrs - return 1 if the IP address is one we don't want
1042 * to use, such as an address in the loopback net or a multicast address.
1043 * addr is in network byte order.
1044 */
1045int
1046bad_ip_adrs(addr)
1047    u_int32_t addr;
1048{
1049    addr = ntohl(addr);
1050    return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
1051        || IN_MULTICAST(addr) || IN_BADCLASS(addr);
1052}
1053
1054/*
1055 * free_wordlist - release memory allocated for a wordlist.
1056 */
1057static void
1058free_wordlist(wp)
1059    struct wordlist *wp;
1060{
1061    struct wordlist *next;
1062
1063    while (wp != NULL) {
1064        next = wp->next;
1065        free(wp);
1066        wp = next;
1067    }
1068}
1069
1070/*
1071 * auth_script - execute a script with arguments
1072 * interface-name peer-name real-user tty speed
1073 */
1074static void
1075auth_script(s)
1076    enum script_state s;
1077{
1078    switch (s) {
1079    case s_up:
1080        auth_script_state = s_up;
1081        if ( auth_linkup_hook ) {
1082          (*auth_linkup_hook)();
1083        }
1084        break;
1085    case s_down:
1086        auth_script_state = s_down;
1087        if ( auth_linkdown_hook ) {
1088          (*auth_linkdown_hook)();
1089        }
1090        break;
1091    }
1092}
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