Fix coverity issues
[freeradius.git] / src / main / auth.c
1 /*
2  * auth.c       User authentication.
3  *
4  * Version:     $Id$
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19  *
20  * Copyright 2000,2006  The FreeRADIUS server project
21  * Copyright 2000  Miquel van Smoorenburg <miquels@cistron.nl>
22  * Copyright 2000  Jeff Carneal <jeff@apex.net>
23  */
24 RCSID("$Id$")
25
26 #include <freeradius-devel/radiusd.h>
27 #include <freeradius-devel/modules.h>
28 #include <freeradius-devel/rad_assert.h>
29
30 #include <ctype.h>
31
32 /*
33  *      Return a short string showing the terminal server, port
34  *      and calling station ID.
35  */
36 char *auth_name(char *buf, size_t buflen, REQUEST *request, int do_cli)
37 {
38         VALUE_PAIR      *cli;
39         VALUE_PAIR      *pair;
40         int             port = 0;
41         const char      *tls = "";
42
43         if ((cli = pairfind(request->packet->vps, PW_CALLING_STATION_ID, 0, TAG_ANY)) == NULL)
44                 do_cli = 0;
45         if ((pair = pairfind(request->packet->vps, PW_NAS_PORT, 0, TAG_ANY)) != NULL)
46                 port = pair->vp_integer;
47
48         if (request->packet->dst_port == 0) {
49                 if (pairfind(request->packet->vps, PW_FREERADIUS_PROXIED_TO, 0, TAG_ANY)) {
50                         tls = " via TLS tunnel";
51                 } else {
52                         tls = " via proxy to virtual server";
53                 }
54         }
55
56         snprintf(buf, buflen, "from client %.128s port %u%s%.128s%s",
57                         request->client->shortname, port,
58                  (do_cli ? " cli " : ""), (do_cli ? (char *)cli->vp_strvalue : ""),
59                  tls);
60
61         return buf;
62 }
63
64
65
66 /*
67  * Make sure user/pass are clean
68  * and then log them
69  */
70 static int rad_authlog(const char *msg, REQUEST *request, int goodpass)
71 {
72         int logit;
73         const char *extra_msg = NULL;
74         char clean_password[1024];
75         char clean_username[1024];
76         char buf[1024];
77         char extra[1024];
78         char *p;
79         VALUE_PAIR *username = NULL;
80
81         if (!request->root->log_auth) {
82                 return 0;
83         }
84
85         /*
86          * Get the correct username based on the configured value
87          */
88         if (log_stripped_names == 0) {
89                 username = pairfind(request->packet->vps, PW_USER_NAME, 0, TAG_ANY);
90         } else {
91                 username = request->username;
92         }
93
94         /*
95          *      Clean up the username
96          */
97         if (username == NULL) {
98                 strcpy(clean_username, "<no User-Name attribute>");
99         } else {
100                 fr_print_string((char *)username->vp_strvalue,
101                                 username->length,
102                                 clean_username, sizeof(clean_username));
103         }
104
105         /*
106          *      Clean up the password
107          */
108         if (request->root->log_auth_badpass || request->root->log_auth_goodpass) {
109                 if (!request->password) {
110                         VALUE_PAIR *auth_type;
111
112                         auth_type = pairfind(request->config_items, PW_AUTH_TYPE, 0, TAG_ANY);
113                         if (auth_type) {
114                                 snprintf(clean_password, sizeof(clean_password),
115                                          "<via Auth-Type = %s>",
116                                          dict_valnamebyattr(PW_AUTH_TYPE, 0,
117                                                             auth_type->vp_integer));
118                         } else {
119                                 strcpy(clean_password, "<no User-Password attribute>");
120                         }
121                 } else if (pairfind(request->packet->vps, PW_CHAP_PASSWORD, 0, TAG_ANY)) {
122                         strcpy(clean_password, "<CHAP-Password>");
123                 } else {
124                         fr_print_string((char *)request->password->vp_strvalue,
125                                          request->password->length,
126                                          clean_password, sizeof(clean_password));
127                 }
128         }
129
130         if (goodpass) {
131                 logit = request->root->log_auth_goodpass;
132                 extra_msg = request->root->auth_goodpass_msg;
133         } else {
134                 logit = request->root->log_auth_badpass;
135                 extra_msg = request->root->auth_badpass_msg;
136         }
137
138         if (extra_msg) {
139                 extra[0] = ' ';
140                 p = extra + 1;
141                 if (radius_xlat(p, sizeof(extra) - 1, request, extra_msg, NULL, NULL) < 0) {
142                         return -1;
143                 }
144         } else {
145                 *extra = '\0';
146         }
147
148         radlog_request(L_AUTH, 0, request, "%s: [%s%s%s] (%s)%s",
149                        msg,
150                        clean_username,
151                        logit ? "/" : "",
152                        logit ? clean_password : "",
153                        auth_name(buf, sizeof(buf), request, 1),
154                        extra);
155
156         return 0;
157 }
158
159 /*
160  *      Check password.
161  *
162  *      Returns:        0  OK
163  *                      -1 Password fail
164  *                      -2 Rejected (Auth-Type = Reject, send Port-Message back)
165  *                      1  End check & return, don't reply
166  *
167  *      NOTE: NOT the same as the RLM_ values !
168  */
169 static int rad_check_password(REQUEST *request)
170 {
171         VALUE_PAIR *auth_type_pair;
172         VALUE_PAIR *cur_config_item;
173         int auth_type = -1;
174         int result;
175         int auth_type_count = 0;
176         result = 0;
177
178         /*
179          *      Look for matching check items. We skip the whole lot
180          *      if the authentication type is PW_AUTHTYPE_ACCEPT or
181          *      PW_AUTHTYPE_REJECT.
182          */
183         cur_config_item = request->config_items;
184         while(((auth_type_pair = pairfind(cur_config_item, PW_AUTH_TYPE, 0, TAG_ANY))) != NULL) {
185                 auth_type = auth_type_pair->vp_integer;
186                 auth_type_count++;
187
188                 RDEBUG2("Found Auth-Type = %s",
189                         dict_valnamebyattr(PW_AUTH_TYPE, 0, auth_type));
190                 cur_config_item = auth_type_pair->next;
191
192                 if (auth_type == PW_AUTHTYPE_REJECT) {
193                         RDEBUG2("Auth-Type = Reject, rejecting user");
194                         return -2;
195                 }
196         }
197
198         /*
199          *      Warn if more than one Auth-Type was found, because only the last
200          *      one found will actually be used.
201          */
202         if (( auth_type_count > 1) && (debug_flag)) {
203                 radlog_request(L_ERR, 0, request, "Warning:  Found %d auth-types on request for user '%s'",
204                         auth_type_count, request->username->vp_strvalue);
205         }
206
207         /*
208          *      This means we have a proxy reply or an accept and it wasn't
209          *      rejected in the above loop. So that means it is accepted and we
210          *      do no further authentication.
211          */
212         if ((auth_type == PW_AUTHTYPE_ACCEPT)
213 #ifdef WITH_PROXY
214             || (request->proxy)
215 #endif
216             ) {
217                 RDEBUG2("Auth-Type = Accept, accepting the user");
218                 return 0;
219         }
220
221         /*
222          *      Check that Auth-Type has been set, and reject if not.
223          *
224          *      Do quick checks to see if Cleartext-Password or Crypt-Password have
225          *      been set, and complain if so.
226          */
227         if (auth_type < 0) {
228                 if (pairfind(request->config_items, PW_CRYPT_PASSWORD, 0, TAG_ANY) != NULL) {
229                         RDEBUG2W("Please update your configuration, and remove 'Auth-Type = Crypt'");
230                         RDEBUG2W("Use the PAP module instead.");
231                 }
232                 else if (pairfind(request->config_items, PW_CLEARTEXT_PASSWORD, 0, TAG_ANY) != NULL) {
233                         RDEBUG2W("Please update your configuration, and remove 'Auth-Type = Local'");
234                         RDEBUG2W("Use the PAP or CHAP modules instead.");
235                 }
236
237                 /*
238                  *      The admin hasn't told us how to
239                  *      authenticate the user, so we reject them!
240                  *
241                  *      This is fail-safe.
242                  */
243
244                 RDEBUG2E("No Auth-Type found: rejecting the user via Post-Auth-Type = Reject");
245                 return -2;
246         }
247
248         /*
249          *      See if there is a module that handles
250          *      this Auth-Type, and turn the RLM_ return
251          *      status into the values as defined at
252          *      the top of this function.
253          */
254         result = process_authenticate(auth_type, request);
255         switch (result) {
256                 /*
257                  *      An authentication module FAIL
258                  *      return code, or any return code that
259                  *      is not expected from authentication,
260                  *      is the same as an explicit REJECT!
261                  */
262                 case RLM_MODULE_FAIL:
263                 case RLM_MODULE_INVALID:
264                 case RLM_MODULE_NOOP:
265                 case RLM_MODULE_NOTFOUND:
266                 case RLM_MODULE_REJECT:
267                 case RLM_MODULE_UPDATED:
268                 case RLM_MODULE_USERLOCK:
269                 default:
270                         result = -1;
271                         break;
272                 case RLM_MODULE_OK:
273                         result = 0;
274                         break;
275                 case RLM_MODULE_HANDLED:
276                         result = 1;
277                         break;
278         }
279
280         return result;
281 }
282
283 /*
284  *      Post-authentication step processes the response before it is
285  *      sent to the NAS. It can receive both Access-Accept and Access-Reject
286  *      replies.
287  */
288 int rad_postauth(REQUEST *request)
289 {
290         int     result;
291         int     postauth_type = 0;
292         VALUE_PAIR *vp;
293
294         /*
295          *      Do post-authentication calls. ignoring the return code.
296          */
297         vp = pairfind(request->config_items, PW_POST_AUTH_TYPE, 0, TAG_ANY);
298         if (vp) {
299                 postauth_type = vp->vp_integer;
300                 RDEBUG2("Using Post-Auth-Type %s",
301                         dict_valnamebyattr(PW_POST_AUTH_TYPE, 0, postauth_type));
302         }
303         result = process_post_auth(postauth_type, request);
304         switch (result) {
305                 /*
306                  *      The module failed, or said to reject the user: Do so.
307                  */
308                 case RLM_MODULE_FAIL:
309                 case RLM_MODULE_INVALID:
310                 case RLM_MODULE_REJECT:
311                 case RLM_MODULE_USERLOCK:
312                 default:
313                         request->reply->code = PW_AUTHENTICATION_REJECT;
314                         result = RLM_MODULE_REJECT;
315                         break;
316                 /*
317                  *      The module handled the request, cancel the reply.
318                  */
319                 case RLM_MODULE_HANDLED:
320                         /* FIXME */
321                         break;
322                 /*
323                  *      The module had a number of OK return codes.
324                  */
325                 case RLM_MODULE_NOOP:
326                 case RLM_MODULE_NOTFOUND:
327                 case RLM_MODULE_OK:
328                 case RLM_MODULE_UPDATED:
329                         result = RLM_MODULE_OK;
330                         break;
331         }
332         return result;
333 }
334
335 /*
336  *      Process and reply to an authentication request
337  *
338  *      The return value of this function isn't actually used right now, so
339  *      it's not entirely clear if it is returning the right things. --Pac.
340  */
341 int rad_authenticate(REQUEST *request)
342 {
343         VALUE_PAIR      *namepair;
344 #ifdef WITH_SESSION_MGMT
345         VALUE_PAIR      *check_item;
346 #endif
347         VALUE_PAIR      *auth_item = NULL;
348         VALUE_PAIR      *module_msg;
349         VALUE_PAIR      *tmp = NULL;
350         int             result;
351         const char      *password;
352         char            autz_retry = 0;
353         int             autz_type = 0;
354
355         password = "";
356
357 #ifdef WITH_PROXY
358         /*
359          *      If this request got proxied to another server, we need
360          *      to check whether it authenticated the request or not.
361          */
362         if (request->proxy_reply) {
363                 switch (request->proxy_reply->code) {
364                 /*
365                  *      Reply of ACCEPT means accept, thus set Auth-Type
366                  *      accordingly.
367                  */
368                 case PW_AUTHENTICATION_ACK:
369                         tmp = radius_paircreate(request,
370                                                 &request->config_items,
371                                                 PW_AUTH_TYPE, 0);
372                         if (tmp) tmp->vp_integer = PW_AUTHTYPE_ACCEPT;
373                         goto authenticate;
374
375                 /*
376                  *      Challenges are punted back to the NAS without any
377                  *      further processing.
378                  */
379                 case PW_ACCESS_CHALLENGE:
380                         request->reply->code = PW_ACCESS_CHALLENGE;
381                         return RLM_MODULE_OK;
382                 /*
383                  *      ALL other replies mean reject. (this is fail-safe)
384                  *
385                  *      Do NOT do any authorization or authentication. They
386                  *      are being rejected, so we minimize the amount of work
387                  *      done by the server, by rejecting them here.
388                  */
389                 case PW_AUTHENTICATION_REJECT:
390                         rad_authlog("Login incorrect (Home Server says so)",
391                                     request, 0);
392                         request->reply->code = PW_AUTHENTICATION_REJECT;
393                         return RLM_MODULE_REJECT;
394
395                 default:
396                         rad_authlog("Login incorrect (Home Server failed to respond)",
397                                     request, 0);
398                         return RLM_MODULE_REJECT;
399                 }
400         }
401 #endif
402
403         /*
404          *      Get the username from the request.
405          *
406          *      Note that namepair MAY be NULL, in which case there
407          *      is no User-Name attribute in the request.
408          */
409         namepair = request->username;
410
411         /*
412          *      Look for, and cache, passwords.
413          */
414         if (!request->password) {
415                 request->password = pairfind(request->packet->vps, PW_USER_PASSWORD, 0, TAG_ANY);
416         }
417
418         /*
419          *      Discover which password we want to use.
420          */
421         auth_item = request->password;
422         if (auth_item) {
423                 password = (const char *)auth_item->vp_strvalue;
424
425         } else {
426                 /*
427                  *      Maybe there's a CHAP-Password?
428                  */
429                 if ((auth_item = pairfind(request->packet->vps, PW_CHAP_PASSWORD, 0, TAG_ANY)) != NULL) {
430                         password = "<CHAP-PASSWORD>";
431
432                 } else {
433                         /*
434                          *      No password we recognize.
435                          */
436                         password = "<NO-PASSWORD>";
437                 }
438         }
439         request->password = auth_item;
440
441         /*
442          *      Get the user's authorization information from the database
443          */
444 autz_redo:
445         result = process_authorize(autz_type, request);
446         switch (result) {
447                 case RLM_MODULE_NOOP:
448                 case RLM_MODULE_NOTFOUND:
449                 case RLM_MODULE_OK:
450                 case RLM_MODULE_UPDATED:
451                         break;
452                 case RLM_MODULE_HANDLED:
453                         return result;
454                 case RLM_MODULE_FAIL:
455                 case RLM_MODULE_INVALID:
456                 case RLM_MODULE_REJECT:
457                 case RLM_MODULE_USERLOCK:
458                 default:
459                         if ((module_msg = pairfind(request->packet->vps, PW_MODULE_FAILURE_MESSAGE, 0, TAG_ANY)) != NULL) {
460                                 char msg[MAX_STRING_LEN + 16];
461                                 snprintf(msg, sizeof(msg), "Invalid user (%s)",
462                                          module_msg->vp_strvalue);
463                                 rad_authlog(msg,request,0);
464                         } else {
465                                 rad_authlog("Invalid user", request, 0);
466                         }
467                         request->reply->code = PW_AUTHENTICATION_REJECT;
468                         return result;
469         }
470         if (!autz_retry) {
471                 tmp = pairfind(request->config_items, PW_AUTZ_TYPE, 0, TAG_ANY);
472                 if (tmp) {
473                         autz_type = tmp->vp_integer;
474                         RDEBUG2("Using Autz-Type %s",
475                                 dict_valnamebyattr(PW_AUTZ_TYPE, 0, autz_type));
476                         autz_retry = 1;
477                         goto autz_redo;
478                 }
479         }
480
481         /*
482          *      If we haven't already proxied the packet, then check
483          *      to see if we should.  Maybe one of the authorize
484          *      modules has decided that a proxy should be used. If
485          *      so, get out of here and send the packet.
486          */
487         if (
488 #ifdef WITH_PROXY
489             (request->proxy == NULL) &&
490 #endif
491             ((tmp = pairfind(request->config_items, PW_PROXY_TO_REALM, 0, TAG_ANY)) != NULL)) {
492                 REALM *realm;
493
494                 realm = realm_find2(tmp->vp_strvalue);
495
496                 /*
497                  *      Don't authenticate, as the request is going to
498                  *      be proxied.
499                  */
500                 if (realm && realm->auth_pool) {
501                         return RLM_MODULE_OK;
502                 }
503
504                 /*
505                  *      Catch users who set Proxy-To-Realm to a LOCAL
506                  *      realm (sigh).  But don't complain if it is
507                  *      *the* LOCAL realm.
508                  */
509                 if (realm &&(strcmp(realm->name, "LOCAL") != 0)) {
510                         RDEBUG2W("You set Proxy-To-Realm = %s, but it is a LOCAL realm!  Cancelling proxy request.", realm->name);
511                 }
512
513                 if (!realm) {
514                         RDEBUG2W("You set Proxy-To-Realm = %s, but the realm does not exist!  Cancelling invalid proxy request.", tmp->vp_strvalue);
515                 }
516         }
517
518 #ifdef WITH_PROXY
519  authenticate:
520 #endif
521
522         /*
523          *      Perhaps there is a Stripped-User-Name now.
524          */
525         namepair = request->username;
526
527         /*
528          *      Validate the user
529          */
530         do {
531                 result = rad_check_password(request);
532                 if (result > 0) {
533                         /* don't reply! */
534                         return RLM_MODULE_HANDLED;
535                 }
536         } while(0);
537
538         /*
539          *      Failed to validate the user.
540          *
541          *      We PRESUME that the code which failed will clean up
542          *      request->reply->vps, to be ONLY the reply items it
543          *      wants to send back.
544          */
545         if (result < 0) {
546                 RDEBUG2("Failed to authenticate the user.");
547                 request->reply->code = PW_AUTHENTICATION_REJECT;
548
549                 if ((module_msg = pairfind(request->packet->vps, PW_MODULE_FAILURE_MESSAGE, 0, TAG_ANY)) != NULL){
550                         char msg[MAX_STRING_LEN+19];
551
552                         snprintf(msg, sizeof(msg), "Login incorrect (%s)",
553                                  module_msg->vp_strvalue);
554                         rad_authlog(msg, request, 0);
555                 } else {
556                         rad_authlog("Login incorrect", request, 0);
557                 }
558
559                 /* double check: maybe the secret is wrong? */
560                 if ((debug_flag > 1) && (auth_item != NULL) &&
561                                 (auth_item->da->attr == PW_USER_PASSWORD)) {
562                         uint8_t *p;
563
564                         p = (uint8_t *) auth_item->vp_strvalue;
565                         while (*p) {
566                                 int size;
567
568                                 size = fr_utf8_char(p);
569                                 if (!size) {
570                                         log_debug("  WARNING: Unprintable characters in the password.  Double-check the shared secret on the server and the NAS!");
571                                         break;
572                                 }
573                                 p += size;
574                         }
575                 }
576         }
577
578 #ifdef WITH_SESSION_MGMT
579         if (result >= 0 &&
580             (check_item = pairfind(request->config_items, PW_SIMULTANEOUS_USE, 0, TAG_ANY)) != NULL) {
581                 int r, session_type = 0;
582                 char            logstr[1024];
583                 char            umsg[MAX_STRING_LEN + 1];
584                 const char      *user_msg = NULL;
585
586                 tmp = pairfind(request->config_items, PW_SESSION_TYPE, 0, TAG_ANY);
587                 if (tmp) {
588                         session_type = tmp->vp_integer;
589                         RDEBUG2("Using Session-Type %s",
590                                 dict_valnamebyattr(PW_SESSION_TYPE, 0, session_type));
591                 }
592
593                 /*
594                  *      User authenticated O.K. Now we have to check
595                  *      for the Simultaneous-Use parameter.
596                  */
597                 if (namepair &&
598                     (r = process_checksimul(session_type, request, check_item->vp_integer)) != 0) {
599                         char mpp_ok = 0;
600
601                         if (r == 2){
602                                 /* Multilink attempt. Check if port-limit > simultaneous-use */
603                                 VALUE_PAIR *port_limit;
604
605                                 if ((port_limit = pairfind(request->reply->vps, PW_PORT_LIMIT, 0, TAG_ANY)) != NULL &&
606                                         port_limit->vp_integer > check_item->vp_integer){
607                                         RDEBUG2("MPP is OK");
608                                         mpp_ok = 1;
609                                 }
610                         }
611                         if (!mpp_ok){
612                                 if (check_item->vp_integer > 1) {
613                                 snprintf(umsg, sizeof(umsg),
614                                                         "\r\nYou are already logged in %d times  - access denied\r\n\n",
615                                                         (int)check_item->vp_integer);
616                                         user_msg = umsg;
617                                 } else {
618                                         user_msg = "\r\nYou are already logged in - access denied\r\n\n";
619                                 }
620
621                                 request->reply->code = PW_AUTHENTICATION_REJECT;
622
623                                 /*
624                                  *      They're trying to log in too many times.
625                                  *      Remove ALL reply attributes.
626                                  */
627                                 pairfree(&request->reply->vps);
628                                 pairmake_reply("Reply-Message",
629                                                user_msg, T_OP_SET);
630
631                                 snprintf(logstr, sizeof(logstr), "Multiple logins (max %d) %s",
632                                         check_item->vp_integer,
633                                         r == 2 ? "[MPP attempt]" : "");
634                                 rad_authlog(logstr, request, 1);
635
636                                 result = -1;
637                         }
638                 }
639         }
640 #endif
641
642         /*
643          *      Result should be >= 0 here - if not, it means the user
644          *      is rejected, so we just process post-auth and return.
645          */
646         if (result < 0) {
647                 return RLM_MODULE_REJECT;
648         }
649
650         /*
651          *      Set the reply to Access-Accept, if it hasn't already
652          *      been set to something.  (i.e. Access-Challenge)
653          */
654         if (request->reply->code == 0)
655           request->reply->code = PW_AUTHENTICATION_ACK;
656
657         if ((module_msg = pairfind(request->packet->vps, PW_MODULE_SUCCESS_MESSAGE, 0, TAG_ANY)) != NULL){
658                 char msg[MAX_STRING_LEN+12];
659
660                 snprintf(msg, sizeof(msg), "Login OK (%s)",
661                          module_msg->vp_strvalue);
662                 rad_authlog(msg, request, 1);
663         } else {
664                 rad_authlog("Login OK", request, 1);
665         }
666
667         return result;
668 }
669
670 /*
671  *      Run a virtual server auth and postauth
672  *
673  */
674 int rad_virtual_server(REQUEST *request)
675 {
676         VALUE_PAIR *vp;
677         int result;
678
679         /*
680          *      We currently only handle AUTH packets here.
681          *      This could be expanded to handle other packets as well if required.
682          */
683         rad_assert(request->packet->code == PW_AUTHENTICATION_REQUEST);
684
685         result = rad_authenticate(request);
686
687         if (request->reply->code == PW_AUTHENTICATION_REJECT) {
688                 pairdelete(&request->config_items, PW_POST_AUTH_TYPE, 0, TAG_ANY);
689                 vp = pairmake_config("Post-Auth-Type", "Reject", T_OP_SET);
690                 if (vp) rad_postauth(request);
691         }
692
693         if (request->reply->code == PW_AUTHENTICATION_ACK) {
694                 rad_postauth(request);
695         }
696
697         return result;
698 }
699