1
/*****************************************************************************
2
* auth.c - Network Authentication and Phase Control program file.
4
* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5
* Copyright (c) 1997 by Global Election Systems Inc. All rights reserved.
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice and the following disclaimer are included verbatim in any
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* distributions. No written agreement, license, or royalty fee is required
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* for any of the authorized uses.
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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******************************************************************************
28
* 03-01-01 Marc Boucher <marc@mbsi.ca>
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* 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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* Ported from public pppd code.
32
*****************************************************************************/
34
* auth.c - PPP authentication and phase control.
36
* Copyright (c) 1993 The Australian National University.
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* All rights reserved.
39
* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Australian National University. The name of the University
45
* may not be used to endorse or promote products derived from this
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* software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
49
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
54
* Redistribution and use in source and binary forms are permitted
55
* provided that the above copyright notice and this paragraph are
56
* duplicated in all such forms and that any documentation,
57
* advertising materials, and other materials related to such
58
* distribution and use acknowledge that the software was developed
59
* by Carnegie Mellon University. The name of the
60
* University may not be used to endorse or promote products derived
61
* from this software without specific prior written permission.
62
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
63
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
64
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
83
/*************************/
84
/*** LOCAL DEFINITIONS ***/
85
/*************************/
87
/* Bits in auth_pending[] */
88
#define PAP_WITHPEER 1
90
#define CHAP_WITHPEER 4
95
/************************/
96
/*** LOCAL DATA TYPES ***/
97
/************************/
98
/* Used for storing a sequence of words. Usually malloced. */
100
struct wordlist *next;
106
/***********************************/
107
/*** LOCAL FUNCTION DECLARATIONS ***/
108
/***********************************/
109
extern char *crypt (const char *, const char *);
111
/* Prototypes for procedures local to this file. */
113
static void network_phase (int);
114
static void check_idle (void *);
115
static void connect_time_expired (void *);
117
static int login (char *, char *, char **, int *);
119
static void logout (void);
120
static int null_login (int);
121
static int get_pap_passwd (int, char *, char *);
122
static int have_pap_secret (void);
123
static int have_chap_secret (char *, char *, u32_t);
124
static int ip_addr_check (u32_t, struct wordlist *);
125
#if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 */
126
static void set_allowed_addrs(int unit, struct wordlist *addrs);
127
static void free_wordlist (struct wordlist *);
130
static void callback_phase (int);
134
/******************************/
135
/*** PUBLIC DATA STRUCTURES ***/
136
/******************************/
139
/*****************************/
140
/*** LOCAL DATA STRUCTURES ***/
141
/*****************************/
142
#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
143
/* The name by which the peer authenticated itself to us. */
144
static char peer_authname[MAXNAMELEN];
147
/* Records which authentication operations haven't completed yet. */
148
static int auth_pending[NUM_PPP];
150
/* Set if we have successfully called login() */
151
static int logged_in;
153
/* Set if we have run the /etc/ppp/auth-up script. */
154
static int did_authup;
156
/* List of addresses which the peer may use. */
157
static struct wordlist *addresses[NUM_PPP];
159
/* Number of network protocols which we have opened. */
160
static int num_np_open;
162
/* Number of network protocols which have come up. */
163
static int num_np_up;
165
#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
166
/* Set if we got the contents of passwd[] from the pap-secrets file. */
167
static int passwd_from_file;
172
/***********************************/
173
/*** PUBLIC FUNCTION DEFINITIONS ***/
174
/***********************************/
176
* An Open on LCP has requested a change from Dead to Establish phase.
177
* Do what's necessary to bring the physical layer up.
179
void link_required(int unit)
181
AUTHDEBUG((LOG_INFO, "link_required: %d\n", unit));
185
* LCP has terminated the link; go to the Dead phase and take the
186
* physical layer down.
188
void link_terminated(int unit)
190
AUTHDEBUG((LOG_INFO, "link_terminated: %d\n", unit));
192
if (lcp_phase[unit] == PHASE_DEAD)
196
lcp_phase[unit] = PHASE_DEAD;
197
AUTHDEBUG((LOG_NOTICE, "Connection terminated.\n"));
202
* LCP has gone down; it will either die or try to re-establish.
204
void link_down(int unit)
207
struct protent *protp;
209
AUTHDEBUG((LOG_INFO, "link_down: %d\n", unit));
211
/* XXX Do link down processing. */
214
for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) {
215
if (!protp->enabled_flag)
217
if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
218
(*protp->lowerdown)(unit);
219
if (protp->protocol < 0xC000 && protp->close != NULL)
220
(*protp->close)(unit, "LCP down");
224
if (lcp_phase[unit] != PHASE_DEAD)
225
lcp_phase[unit] = PHASE_TERMINATE;
230
* The link is established.
231
* Proceed to the Dead, Authenticate or Network phase as appropriate.
233
void link_established(int unit)
237
struct protent *protp;
238
lcp_options *wo = &lcp_wantoptions[unit];
239
lcp_options *go = &lcp_gotoptions[unit];
240
#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
241
lcp_options *ho = &lcp_hisoptions[unit];
244
AUTHDEBUG((LOG_INFO, "link_established: %d\n", unit));
246
* Tell higher-level protocols that LCP is up.
248
for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i)
249
if (protp->protocol != PPP_LCP && protp->enabled_flag
250
&& protp->lowerup != NULL)
251
(*protp->lowerup)(unit);
253
if (ppp_settings.auth_required && !(go->neg_chap || go->neg_upap)) {
255
* We wanted the peer to authenticate itself, and it refused:
256
* treat it as though it authenticated with PAP using a username
257
* of "" and a password of "". If that's not OK, boot it out.
259
if (!wo->neg_upap || !null_login(unit)) {
260
AUTHDEBUG((LOG_WARNING, "peer refused to authenticate\n"));
261
lcp_close(unit, "peer refused to authenticate");
266
lcp_phase[unit] = PHASE_AUTHENTICATE;
270
ChapAuthPeer(unit, ppp_settings.our_name, go->chap_mdtype);
274
#if PAP_SUPPORT > 0 && CHAP_SUPPORT > 0
285
ChapAuthWithPeer(unit, ppp_settings.user, ho->chap_mdtype);
286
auth |= CHAP_WITHPEER;
289
#if PAP_SUPPORT > 0 && CHAP_SUPPORT > 0
294
if (ppp_settings.passwd[0] == 0) {
295
passwd_from_file = 1;
296
if (!get_pap_passwd(unit, ppp_settings.user, ppp_settings.passwd))
297
AUTHDEBUG((LOG_ERR, "No secret found for PAP login\n"));
299
upap_authwithpeer(unit, ppp_settings.user, ppp_settings.passwd);
300
auth |= PAP_WITHPEER;
303
auth_pending[unit] = auth;
311
* The peer has failed to authenticate himself using `protocol'.
313
void auth_peer_fail(int unit, u16_t protocol)
315
AUTHDEBUG((LOG_INFO, "auth_peer_fail: %d proto=%X\n", unit, protocol));
317
* Authentication failure: take the link down
319
lcp_close(unit, "Authentication failed");
323
#if PAP_SUPPORT > 0 || CHAP_SUPPORT > 0
325
* The peer has been successfully authenticated using `protocol'.
327
void auth_peer_success(int unit, u16_t protocol, char *name, int namelen)
331
AUTHDEBUG((LOG_INFO, "auth_peer_success: %d proto=%X\n", unit, protocol));
340
AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n",
346
* Save the authenticated name of the peer for later.
348
if (namelen > sizeof(peer_authname) - 1)
349
namelen = sizeof(peer_authname) - 1;
350
BCOPY(name, peer_authname, namelen);
351
peer_authname[namelen] = 0;
354
* If there is no more authentication still to be done,
355
* proceed to the network (or callback) phase.
357
if ((auth_pending[unit] &= ~pbit) == 0)
362
* We have failed to authenticate ourselves to the peer using `protocol'.
364
void auth_withpeer_fail(int unit, u16_t protocol)
366
int errCode = PPPERR_AUTHFAIL;
368
AUTHDEBUG((LOG_INFO, "auth_withpeer_fail: %d proto=%X\n", unit, protocol));
369
if (passwd_from_file)
370
BZERO(ppp_settings.passwd, MAXSECRETLEN);
372
* XXX Warning: the unit number indicates the interface which is
373
* not necessarily the PPP connection. It works here as long
374
* as we are only supporting PPP interfaces.
376
pppIOCtl(unit, PPPCTLS_ERRCODE, &errCode);
379
* We've failed to authenticate ourselves to our peer.
380
* He'll probably take the link down, and there's not much
381
* we can do except wait for that.
386
* We have successfully authenticated ourselves with the peer using `protocol'.
388
void auth_withpeer_success(int unit, u16_t protocol)
392
AUTHDEBUG((LOG_INFO, "auth_withpeer_success: %d proto=%X\n", unit, protocol));
395
pbit = CHAP_WITHPEER;
398
if (passwd_from_file)
399
BZERO(ppp_settings.passwd, MAXSECRETLEN);
403
AUTHDEBUG((LOG_WARNING, "auth_peer_success: unknown protocol %x\n",
409
* If there is no more authentication still being done,
410
* proceed to the network (or callback) phase.
412
if ((auth_pending[unit] &= ~pbit) == 0)
419
* np_up - a network protocol has come up.
421
void np_up(int unit, u16_t proto)
423
AUTHDEBUG((LOG_INFO, "np_up: %d proto=%X\n", unit, proto));
424
if (num_np_up == 0) {
425
AUTHDEBUG((LOG_INFO, "np_up: maxconnect=%d idle_time_limit=%d\n",ppp_settings.maxconnect,ppp_settings.idle_time_limit));
427
* At this point we consider that the link has come up successfully.
429
if (ppp_settings.idle_time_limit > 0)
430
TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit);
433
* Set a timeout to close the connection once the maximum
434
* connect time has expired.
436
if (ppp_settings.maxconnect > 0)
437
TIMEOUT(connect_time_expired, 0, ppp_settings.maxconnect);
443
* np_down - a network protocol has gone down.
445
void np_down(int unit, u16_t proto)
447
AUTHDEBUG((LOG_INFO, "np_down: %d proto=%X\n", unit, proto));
448
if (--num_np_up == 0 && ppp_settings.idle_time_limit > 0) {
449
UNTIMEOUT(check_idle, NULL);
454
* np_finished - a network protocol has finished using the link.
456
void np_finished(int unit, u16_t proto)
458
AUTHDEBUG((LOG_INFO, "np_finished: %d proto=%X\n", unit, proto));
459
if (--num_np_open <= 0) {
460
/* no further use for the link: shut up shop. */
461
lcp_close(0, "No network protocols running");
466
* auth_reset - called when LCP is starting negotiations to recheck
467
* authentication options, i.e. whether we have appropriate secrets
468
* to use for authenticating ourselves and/or the peer.
470
void auth_reset(int unit)
472
lcp_options *go = &lcp_gotoptions[unit];
473
lcp_options *ao = &lcp_allowoptions[0];
474
ipcp_options *ipwo = &ipcp_wantoptions[0];
477
AUTHDEBUG((LOG_INFO, "auth_reset: %d\n", unit));
478
ao->neg_upap = !ppp_settings.refuse_pap && (ppp_settings.passwd[0] != 0 || get_pap_passwd(unit, NULL, NULL));
479
ao->neg_chap = !ppp_settings.refuse_chap && ppp_settings.passwd[0] != 0 /*have_chap_secret(ppp_settings.user, ppp_settings.remote_name, (u32_t)0)*/;
481
if (go->neg_upap && !have_pap_secret())
484
remote = ipwo->accept_remote? 0: ipwo->hisaddr;
485
if (!have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote))
493
* check_passwd - Check the user name and passwd against the PAP secrets
494
* file. If requested, also check against the system password database,
495
* and login the user if OK.
498
* UPAP_AUTHNAK: Authentication failed.
499
* UPAP_AUTHACK: Authentication succeeded.
500
* In either case, msg points to an appropriate message.
514
return UPAP_AUTHACK; /* XXX Assume all entries OK. */
517
struct wordlist *addrs = NULL;
518
char passwd[256], user[256];
519
char secret[MAXWORDLEN];
520
static u_short attempts = 0;
523
* Make copies of apasswd and auser, then null-terminate them.
525
BCOPY(apasswd, passwd, passwdlen);
526
passwd[passwdlen] = '\0';
527
BCOPY(auser, user, userlen);
528
user[userlen] = '\0';
531
/* XXX Validate user name and password. */
532
ret = UPAP_AUTHACK; /* XXX Assume all entries OK. */
534
if (ret == UPAP_AUTHNAK) {
535
if (*msg == (char *) 0)
536
*msg = "Login incorrect";
537
*msglen = strlen(*msg);
539
* Frustrate passwd stealer programs.
540
* Allow 10 tries, but start backing off after 3 (stolen from login).
541
* On 10'th, drop the connection.
543
if (attempts++ >= 10) {
544
AUTHDEBUG((LOG_WARNING, "%d LOGIN FAILURES BY %s\n", attempts, user));
545
/*ppp_panic("Excess Bad Logins");*/
548
sys_msleep((attempts - 3) * 5);
551
free_wordlist(addrs);
554
attempts = 0; /* Reset count */
555
if (*msg == (char *) 0)
557
*msglen = strlen(*msg);
558
set_allowed_addrs(unit, addrs);
561
BZERO(passwd, sizeof(passwd));
562
BZERO(secret, sizeof(secret));
571
* auth_ip_addr - check whether the peer is authorized to use
572
* a given IP address. Returns 1 if authorized, 0 otherwise.
574
int auth_ip_addr(int unit, u32_t addr)
576
return ip_addr_check(addr, addresses[unit]);
580
* bad_ip_adrs - return 1 if the IP address is one we don't want
581
* to use, such as an address in the loopback net or a multicast address.
582
* addr is in network byte order.
584
int bad_ip_adrs(u32_t addr)
587
return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
588
|| IN_MULTICAST(addr) || IN_BADCLASS(addr);
594
* get_secret - open the CHAP secret file and return the secret
595
* for authenticating the given client on the given server.
596
* (We could be either client or server).
609
struct wordlist *addrs;
613
if(!client || !client[0] || strcmp(client, ppp_settings.user)) {
617
len = strlen(ppp_settings.passwd);
618
if (len > MAXSECRETLEN) {
619
AUTHDEBUG((LOG_ERR, "Secret for %s on %s is too long\n", client, server));
622
BCOPY(ppp_settings.passwd, secret, len);
628
struct wordlist *addrs;
629
char secbuf[MAXWORDLEN];
634
/* XXX Find secret. */
639
set_allowed_addrs(unit, addrs);
641
len = strlen(secbuf);
642
if (len > MAXSECRETLEN) {
643
AUTHDEBUG((LOG_ERR, "Secret for %s on %s is too long\n", client, server));
646
BCOPY(secbuf, secret, len);
647
BZERO(secbuf, sizeof(secbuf));
658
* auth_check_options - called to check authentication options.
660
void auth_check_options(void)
662
lcp_options *wo = &lcp_wantoptions[0];
664
ipcp_options *ipwo = &ipcp_wantoptions[0];
667
/* Default our_name to hostname, and user to our_name */
668
if (ppp_settings.our_name[0] == 0 || ppp_settings.usehostname)
669
strcpy(ppp_settings.our_name, ppp_settings.hostname);
670
if (ppp_settings.user[0] == 0)
671
strcpy(ppp_settings.user, ppp_settings.our_name);
673
/* If authentication is required, ask peer for CHAP or PAP. */
674
if (ppp_settings.auth_required && !wo->neg_chap && !wo->neg_upap) {
680
* Check whether we have appropriate secrets to use
681
* to authenticate the peer.
683
can_auth = wo->neg_upap && have_pap_secret();
684
if (!can_auth && wo->neg_chap) {
685
remote = ipwo->accept_remote? 0: ipwo->hisaddr;
686
can_auth = have_chap_secret(ppp_settings.remote_name, ppp_settings.our_name, remote);
689
if (ppp_settings.auth_required && !can_auth) {
690
ppp_panic("No auth secret");
696
/**********************************/
697
/*** LOCAL FUNCTION DEFINITIONS ***/
698
/**********************************/
700
* Proceed to the network phase.
702
static void network_phase(int unit)
705
struct protent *protp;
706
lcp_options *go = &lcp_gotoptions[unit];
709
* If the peer had to authenticate, run the auth-up script now.
711
if ((go->neg_chap || go->neg_upap) && !did_authup) {
712
/* XXX Do setup for peer authentication. */
718
* If we negotiated callback, do it now.
721
lcp_phase[unit] = PHASE_CALLBACK;
722
(*cbcp_protent.open)(unit);
727
lcp_phase[unit] = PHASE_NETWORK;
728
for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i)
729
if (protp->protocol < 0xC000 && protp->enabled_flag
730
&& protp->open != NULL) {
731
(*protp->open)(unit);
732
if (protp->protocol != PPP_CCP)
736
if (num_np_open == 0)
738
lcp_close(0, "No network protocols running");
742
* check_idle - check whether the link has been idle for long
743
* enough that we can shut it down.
745
static void check_idle(void *arg)
747
struct ppp_idle idle;
751
if (!get_idle_time(0, &idle))
753
itime = LWIP_MIN(idle.xmit_idle, idle.recv_idle);
754
if (itime >= ppp_settings.idle_time_limit) {
755
/* link is idle: shut it down. */
756
AUTHDEBUG((LOG_INFO, "Terminating connection due to lack of activity.\n"));
757
lcp_close(0, "Link inactive");
759
TIMEOUT(check_idle, NULL, ppp_settings.idle_time_limit - itime);
764
* connect_time_expired - log a message and close the connection.
766
static void connect_time_expired(void *arg)
770
AUTHDEBUG((LOG_INFO, "Connect time expired\n"));
771
lcp_close(0, "Connect time expired"); /* Close connection */
776
* login - Check the user name and password against the system
777
* password database, and login the user if OK.
780
* UPAP_AUTHNAK: Login failed.
781
* UPAP_AUTHACK: Login succeeded.
782
* In either case, msg points to an appropriate message.
784
static int login(char *user, char *passwd, char **msg, int *msglen)
786
/* XXX Fail until we decide that we want to support logins. */
787
return (UPAP_AUTHNAK);
792
* logout - Logout the user.
794
static void logout(void)
801
* null_login - Check if a username of "" and a password of "" are
802
* acceptable, and iff so, set the list of acceptable IP addresses
805
static int null_login(int unit)
808
/* XXX Fail until we decide that we want to support logins. */
814
* get_pap_passwd - get a password for authenticating ourselves with
815
* our peer using PAP. Returns 1 on success, 0 if no suitable password
818
static int get_pap_passwd(int unit, char *user, char *passwd)
820
/* normally we would reject PAP if no password is provided,
821
but this causes problems with some providers (like CHT in Taiwan)
822
who incorrectly request PAP and expect a bogus/empty password, so
823
always provide a default user/passwd of "none"/"none"
826
strcpy(user, "none");
828
strcpy(passwd, "none");
835
* have_pap_secret - check whether we have a PAP file with any
836
* secrets that we could possibly use for authenticating the peer.
838
static int have_pap_secret(void)
840
/* XXX Fail until we set up our passwords. */
846
* have_chap_secret - check whether we have a CHAP file with a
847
* secret that we could possibly use for authenticating `client'
848
* on `server'. Either can be the null string, meaning we don't
849
* know the identity yet.
851
static int have_chap_secret(char *client, char *server, u32_t remote)
856
/* XXX Fail until we set up our passwords. */
861
#if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT > 0 */
863
* set_allowed_addrs() - set the list of allowed addresses.
865
static void set_allowed_addrs(int unit, struct wordlist *addrs)
867
if (addresses[unit] != NULL)
868
free_wordlist(addresses[unit]);
869
addresses[unit] = addrs;
873
* If there's only one authorized address we might as well
874
* ask our peer for that one right away
876
if (addrs != NULL && addrs->next == NULL) {
877
char *p = addrs->word;
878
struct ipcp_options *wo = &ipcp_wantoptions[unit];
882
if (wo->hisaddr == 0 && *p != '!' && *p != '-'
883
&& strchr(p, '/') == NULL) {
884
hp = gethostbyname(p);
885
if (hp != NULL && hp->h_addrtype == AF_INET)
886
a = *(u32_t *)hp->h_addr;
897
static int ip_addr_check(u32_t addr, struct wordlist *addrs)
900
/* don't allow loopback or multicast address */
901
if (bad_ip_adrs(addr))
905
return !ppp_settings.auth_required; /* no addresses authorized */
907
/* XXX All other addresses allowed. */
911
#if 0 /* PAP_SUPPORT > 0 || CHAP_SUPPORT */
913
* free_wordlist - release memory allocated for a wordlist.
915
static void free_wordlist(struct wordlist *wp)
917
struct wordlist *next;
927
#endif /* PPP_SUPPORT */