r22042: Try and clean up my own mess using the API Volker
[samba.git] / source3 / nmbd / nmbd_processlogon.c
1 /* 
2    Unix SMB/CIFS implementation.
3    NBT netbios routines and daemon - version 2
4    Copyright (C) Andrew Tridgell 1994-1998
5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
6    Copyright (C) Jeremy Allison 1994-2003
7    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
8    
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 2 of the License, or
12    (at your option) any later version.
13    
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program; if not, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22    
23    Revision History:
24
25 */
26
27 #include "includes.h"
28
29 struct sam_database_info {
30         uint32 index;
31         uint32 serial_lo, serial_hi;
32         uint32 date_lo, date_hi;
33 };
34
35 /****************************************************************************
36 Send a message to smbd to do a sam delta sync
37 **************************************************************************/
38
39 static void send_repl_message(uint32 low_serial)
40 {
41         TDB_CONTEXT *tdb;
42
43         tdb = tdb_open_log(lock_path("connections.tdb"), 0,
44                            TDB_DEFAULT, O_RDONLY, 0);
45
46         if (!tdb) {
47                 DEBUG(3, ("send_repl_message(): failed to open connections "
48                           "database\n"));
49                 return;
50         }
51
52         DEBUG(3, ("sending replication message, serial = 0x%04x\n", 
53                   low_serial));
54         
55         message_send_all(tdb, MSG_SMB_SAM_REPL, &low_serial,
56                          sizeof(low_serial), False, NULL);
57
58         tdb_close(tdb);
59 }
60
61 /****************************************************************************
62 Process a domain logon packet
63 **************************************************************************/
64
65 void process_logon_packet(struct packet_struct *p, char *buf,int len, 
66                           const char *mailslot)
67 {
68         struct dgram_packet *dgram = &p->packet.dgram;
69         pstring my_name;
70         fstring reply_name;
71         pstring outbuf;
72         int code;
73         uint16 token = 0;
74         uint32 ntversion = 0;
75         uint16 lmnttoken = 0;
76         uint16 lm20token = 0;
77         uint32 domainsidsize;
78         BOOL short_request = False;
79         char *getdc;
80         char *uniuser; /* Unicode user name. */
81         pstring ascuser;
82         char *unicomp; /* Unicode computer name. */
83
84         memset(outbuf, 0, sizeof(outbuf));
85
86         if (!lp_domain_logons()) {
87                 DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
88 logons are not enabled.\n", inet_ntoa(p->ip) ));
89                 return;
90         }
91
92         pstrcpy(my_name, global_myname());
93
94         code = get_safe_SVAL(buf,len,buf,0,-1);
95         DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
96
97         switch (code) {
98                 case 0:    
99                         {
100                                 fstring mach_str, user_str, getdc_str;
101                                 char *q = buf + 2;
102                                 char *machine = q;
103                                 char *user = skip_string(buf,len,machine,1);
104
105                                 if (!user || PTR_DIFF(user, buf) >= len) {
106                                         DEBUG(0,("process_logon_packet: bad packet\n"));
107                                         return;
108                                 }
109                                 getdc = skip_string(buf,len,user,1);
110
111                                 if (!getdc || PTR_DIFF(getdc, buf) >= len) {
112                                         DEBUG(0,("process_logon_packet: bad packet\n"));
113                                         return;
114                                 }
115                                 q = skip_string(buf,len,getdc,1);
116
117                                 if (!q || PTR_DIFF(q + 5, buf) > len) {
118                                         DEBUG(0,("process_logon_packet: bad packet\n"));
119                                         return;
120                                 }
121                                 token = SVAL(q,3);
122
123                                 fstrcpy(reply_name,my_name); 
124
125                                 pull_ascii_fstring(mach_str, machine);
126                                 pull_ascii_fstring(user_str, user);
127                                 pull_ascii_fstring(getdc_str, getdc);
128
129                                 DEBUG(5,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
130                                         mach_str,inet_ntoa(p->ip),user_str,token));
131
132                                 q = outbuf;
133                                 SSVAL(q, 0, 6);
134                                 q += 2;
135
136                                 fstrcpy(reply_name, "\\\\");
137                                 fstrcat(reply_name, my_name);
138                                 push_ascii_fstring(q, reply_name);
139                                 q = skip_string(outbuf,sizeof(outbuf),q, 1); /* PDC name */
140
141                                 SSVAL(q, 0, token);
142                                 q += 2;
143
144                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
145
146                                 send_mailslot(True, getdc_str, 
147                                                 outbuf,PTR_DIFF(q,outbuf),
148                                                 global_myname(), 0x0,
149                                                 mach_str,
150                                                 dgram->source_name.name_type,
151                                                 p->ip, *iface_ip(p->ip), p->port);  
152                                 break;
153                         }
154
155                 case QUERYFORPDC:
156                         {
157                                 fstring mach_str, getdc_str;
158                                 fstring source_name;
159                                 char *q = buf + 2;
160                                 char *machine = q;
161
162                                 if (!lp_domain_master()) {  
163                                         /* We're not Primary Domain Controller -- ignore this */
164                                         return;
165                                 }
166
167                                 getdc = skip_string(buf,len,machine,1);
168
169                                 if (!getdc || PTR_DIFF(getdc, buf) >= len) {
170                                         DEBUG(0,("process_logon_packet: bad packet\n"));
171                                         return;
172                                 }
173                                 q = skip_string(buf,len,getdc,1);
174
175                                 if (!q || PTR_DIFF(q, buf) >= len) {
176                                         DEBUG(0,("process_logon_packet: bad packet\n"));
177                                         return;
178                                 }
179                                 q = ALIGN2(q, buf);
180
181                                 /* At this point we can work out if this is a W9X or NT style
182                                    request. Experiments show that the difference is wether the
183                                    packet ends here. For a W9X request we now end with a pair of
184                                    bytes (usually 0xFE 0xFF) whereas with NT we have two further
185                                    strings - the following is a simple way of detecting this */
186
187                                 if (len - PTR_DIFF(q, buf) <= 3) {
188                                         short_request = True;
189                                 } else {
190                                         unicomp = q;
191
192                                         if (PTR_DIFF(q, buf) >= len) {
193                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
194                                                 return;
195                                         }
196
197                                         /* A full length (NT style) request */
198                                         q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
199
200                                         if (PTR_DIFF(q, buf) >= len) {
201                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
202                                                 return;
203                                         }
204
205                                         if (len - PTR_DIFF(q, buf) > 8) {
206                                                 /* with NT5 clients we can sometimes
207                                                         get additional data - a length specificed string
208                                                         containing the domain name, then 16 bytes of
209                                                         data (no idea what it is) */
210                                                 int dom_len = CVAL(q, 0);
211                                                 q++;
212                                                 if (dom_len != 0) {
213                                                         q += dom_len + 1;
214                                                 }
215                                                 q += 16;
216                                         }
217
218                                         if (PTR_DIFF(q + 8, buf) > len) {
219                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
220                                                 return;
221                                         }
222
223                                         ntversion = IVAL(q, 0);
224                                         lmnttoken = SVAL(q, 4);
225                                         lm20token = SVAL(q, 6);
226                                 }
227
228                                 /* Construct reply. */
229                                 q = outbuf;
230                                 SSVAL(q, 0, QUERYFORPDC_R);
231                                 q += 2;
232
233                                 fstrcpy(reply_name,my_name);
234                                 push_ascii_fstring(q, reply_name);
235                                 q = skip_string(outbuf,sizeof(outbuf),q, 1); /* PDC name */
236
237                                 /* PDC and domain name */
238                                 if (!short_request) {
239                                         /* Make a full reply */
240                                         q = ALIGN2(q, outbuf);
241
242                                         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
243                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True); /* Domain name*/
244                                         SIVAL(q, 0, 1); /* our nt version */
245                                         SSVAL(q, 4, 0xffff); /* our lmnttoken */
246                                         SSVAL(q, 6, 0xffff); /* our lm20token */
247                                         q += 8;
248                                 }
249
250                                 /* RJS, 21-Feb-2000, we send a short reply if the request was short */
251
252                                 pull_ascii_fstring(mach_str, machine);
253
254                                 DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, \
255 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
256                                         mach_str,inet_ntoa(p->ip), reply_name, lp_workgroup(),
257                                         QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
258                                         (uint32)lm20token ));
259
260                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
261
262                                 pull_ascii_fstring(getdc_str, getdc);
263                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
264
265                                 send_mailslot(True, getdc_str,
266                                         outbuf,PTR_DIFF(q,outbuf),
267                                         global_myname(), 0x0,
268                                         source_name,
269                                         dgram->source_name.name_type,
270                                         p->ip, *iface_ip(p->ip), p->port);  
271                                 return;
272                         }
273
274                 case SAMLOGON:
275
276                         {
277                                 fstring getdc_str;
278                                 fstring source_name;
279                                 char *q = buf + 2;
280                                 fstring asccomp;
281
282                                 q += 2;
283
284                                 if (PTR_DIFF(q, buf) >= len) {
285                                         DEBUG(0,("process_logon_packet: bad packet\n"));
286                                         return;
287                                 }
288
289                                 unicomp = q;
290                                 uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
291
292                                 if (PTR_DIFF(uniuser, buf) >= len) {
293                                         DEBUG(0,("process_logon_packet: bad packet\n"));
294                                         return;
295                                 }
296
297                                 getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
298
299                                 if (PTR_DIFF(getdc, buf) >= len) {
300                                         DEBUG(0,("process_logon_packet: bad packet\n"));
301                                         return;
302                                 }
303
304                                 q = skip_string(buf,len,getdc,1);
305
306                                 if (!q || PTR_DIFF(q + 8, buf) >= len) {
307                                         DEBUG(0,("process_logon_packet: bad packet\n"));
308                                         return;
309                                 }
310
311                                 q += 4; /* Account Control Bits - indicating username type */
312                                 domainsidsize = IVAL(q, 0);
313                                 q += 4;
314
315                                 DEBUG(5,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
316
317                                 if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
318                                         q += domainsidsize;
319                                         q = ALIGN4(q, buf);
320                                 }
321
322                                 DEBUG(5,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %ld\n", len, (unsigned long)PTR_DIFF(q, buf) ));
323
324                                 if (len - PTR_DIFF(q, buf) > 8) {
325                                         /* with NT5 clients we can sometimes
326                                                 get additional data - a length specificed string
327                                                 containing the domain name, then 16 bytes of
328                                                 data (no idea what it is) */
329                                         int dom_len = CVAL(q, 0);
330                                         q++;
331                                         if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
332                                                 q += dom_len + 1;
333                                         }
334                                         q += 16;
335                                 }
336
337                                 if (PTR_DIFF(q + 8, buf) > len) {
338                                         DEBUG(0,("process_logon_packet: bad packet\n"));
339                                         return;
340                                 }
341
342                                 ntversion = IVAL(q, 0);
343                                 lmnttoken = SVAL(q, 4);
344                                 lm20token = SVAL(q, 6);
345                                 q += 8;
346
347                                 DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
348
349                                 /*
350                                  * we respond regadless of whether the machine is in our password 
351                                  * database. If it isn't then we let smbd send an appropriate error.
352                                  * Let's ignore the SID.
353                                  */
354                                 pull_ucs2_pstring(ascuser, uniuser);
355                                 pull_ucs2_fstring(asccomp, unicomp);
356                                 DEBUG(5,("process_logon_packet: SAMLOGON user %s\n", ascuser));
357
358                                 fstrcpy(reply_name, "\\\\"); /* Here it wants \\LOGONSERVER. */
359                                 fstrcat(reply_name, my_name);
360
361                                 DEBUG(5,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
362                                         asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
363                                 SAMLOGON_R ,lmnttoken));
364
365                                 /* Construct reply. */
366
367                                 q = outbuf;
368                                 /* we want the simple version unless we are an ADS PDC..which means  */
369                                 /* never, at least for now */
370                                 if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
371                                         if (SVAL(uniuser, 0) == 0) {
372                                                 SSVAL(q, 0, SAMLOGON_UNK_R);    /* user unknown */
373                                         } else {
374                                                 SSVAL(q, 0, SAMLOGON_R);
375                                         }
376
377                                         q += 2;
378
379                                         q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
380                                         q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
381                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True);
382                                 }
383 #ifdef HAVE_ADS
384                                 else {
385                                         struct GUID domain_guid;
386                                         UUID_FLAT flat_guid;
387                                         pstring domain;
388                                         pstring hostname;
389                                         char *component, *dc, *q1;
390                                         uint8 size;
391                                         char *q_orig = q;
392                                         int str_offset;
393
394                                         get_mydnsdomname(domain);
395                                         get_myname(hostname);
396         
397                                         if (SVAL(uniuser, 0) == 0) {
398                                                 SIVAL(q, 0, SAMLOGON_AD_UNK_R); /* user unknown */
399                                         } else {
400                                                 SIVAL(q, 0, SAMLOGON_AD_R);
401                                         }
402                                         q += 4;
403
404                                         SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
405                                                 ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
406                                         q += 4;
407
408                                         /* Push Domain GUID */
409                                         if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
410                                                 DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
411                                                 return;
412                                         }
413
414                                         smb_uuid_pack(domain_guid, &flat_guid);
415                                         memcpy(q, &flat_guid.info, UUID_FLAT_SIZE);
416                                         q += UUID_FLAT_SIZE;
417
418                                         /* Forest */
419                                         str_offset = q - q_orig;
420                                         dc = domain;
421                                         q1 = q;
422                                         while ((component = strtok(dc, "."))) {
423                                                 dc = NULL;
424                                                 size = push_ascii(&q[1], component, -1, 0);
425                                                 SCVAL(q, 0, size);
426                                                 q += (size + 1);
427                                         }
428
429                                         /* Unk0 */
430                                         SCVAL(q, 0, 0);
431                                         q++;
432
433                                         /* Domain */
434                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
435                                         SCVAL(q, 1, str_offset & 0xFF);
436                                         q += 2;
437
438                                         /* Hostname */
439                                         size = push_ascii(&q[1], hostname, -1, 0);
440                                         SCVAL(q, 0, size);
441                                         q += (size + 1);
442                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
443                                         SCVAL(q, 1, str_offset & 0xFF);
444                                         q += 2;
445
446                                         /* NETBIOS of domain */
447                                         size = push_ascii(&q[1], lp_workgroup(), -1, STR_UPPER);
448                                         SCVAL(q, 0, size);
449                                         q += (size + 1);
450
451                                         /* Unk1 */
452                                         SCVAL(q, 0, 0);
453                                         q++;
454
455                                         /* NETBIOS of hostname */
456                                         size = push_ascii(&q[1], my_name, -1, 0);
457                                         SCVAL(q, 0, size);
458                                         q += (size + 1);
459
460                                         /* Unk2 */
461                                         SCVAL(q, 0, 0);
462                                         q++;
463
464                                         /* User name */
465                                         if (SVAL(uniuser, 0) != 0) {
466                                                 size = push_ascii(&q[1], ascuser, -1, 0);
467                                                 SCVAL(q, 0, size);
468                                                 q += (size + 1);
469                                         }
470
471                                         q_orig = q;
472                                         /* Site name */
473                                         size = push_ascii(&q[1], "Default-First-Site-Name", -1, 0);
474                                         SCVAL(q, 0, size);
475                                         q += (size + 1);
476
477                                         /* Site name (2) */
478                                         str_offset = q - q_orig;
479                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
480                                         SCVAL(q, 1, str_offset & 0xFF);
481                                         q += 2;
482
483                                         SCVAL(q, 0, PTR_DIFF(q,q1));
484                                         SCVAL(q, 1, 0x10); /* unknown */
485
486                                         SIVAL(q, 0, 0x00000002);
487                                         q += 4; /* unknown */
488                                         SIVAL(q, 0, (iface_ip(p->ip))->s_addr);
489                                         q += 4;
490                                         SIVAL(q, 0, 0x00000000);
491                                         q += 4; /* unknown */
492                                         SIVAL(q, 0, 0x00000000);
493                                         q += 4; /* unknown */
494                                 }       
495 #endif
496
497                                 /* tell the client what version we are */
498                                 SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13); 
499                                 /* our ntversion */
500                                 SSVAL(q, 4, 0xffff); /* our lmnttoken */ 
501                                 SSVAL(q, 6, 0xffff); /* our lm20token */
502                                 q += 8;
503
504                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
505
506                                 pull_ascii_fstring(getdc_str, getdc);
507                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
508
509                                 send_mailslot(True, getdc,
510                                         outbuf,PTR_DIFF(q,outbuf),
511                                         global_myname(), 0x0,
512                                         source_name,
513                                         dgram->source_name.name_type,
514                                         p->ip, *iface_ip(p->ip), p->port);  
515                                 break;
516                         }
517
518                 /* Announce change to UAS or SAM.  Send by the domain controller when a
519                 replication event is required. */
520
521                 case SAM_UAS_CHANGE:
522                         {
523                                 struct sam_database_info *db_info;
524                                 char *q = buf + 2;
525                                 int i, db_count;
526                                 uint32 low_serial;
527           
528                                 /* Header */
529           
530                                 if (PTR_DIFF(q + 16, buf) >= len) {
531                                         DEBUG(0,("process_logon_packet: bad packet\n"));
532                                         return;
533                                 }
534
535                                 low_serial = IVAL(q, 0); q += 4;     /* Low serial number */
536
537                                 q += 4;                   /* Date/time */
538                                 q += 4;                   /* Pulse */
539                                 q += 4;                   /* Random */
540           
541                                 /* Domain info */
542           
543                                 q = skip_string(buf,len,q, 1);    /* PDC name */
544
545                                 if (!q || PTR_DIFF(q, buf) >= len) {
546                                         DEBUG(0,("process_logon_packet: bad packet\n"));
547                                         return;
548                                 }
549
550                                 q = skip_string(buf,len,q, 1);    /* Domain name */
551
552                                 if (!q || PTR_DIFF(q, buf) >= len) {
553                                         DEBUG(0,("process_logon_packet: bad packet\n"));
554                                         return;
555                                 }
556
557                                 q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode PDC name */
558
559                                 if (PTR_DIFF(q, buf) >= len) {
560                                         DEBUG(0,("process_logon_packet: bad packet\n"));
561                                         return;
562                                 }
563
564                                 q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode domain name */
565           
566                                 /* Database info */
567           
568                                 if (PTR_DIFF(q + 2, buf) >= len) {
569                                         DEBUG(0,("process_logon_packet: bad packet\n"));
570                                         return;
571                                 }
572
573                                 db_count = SVAL(q, 0); q += 2;
574
575                                 if (PTR_DIFF(q + (db_count*20), buf) >= len) {
576                                         DEBUG(0,("process_logon_packet: bad packet\n"));
577                                         return;
578                                 }
579
580                                 db_info = SMB_MALLOC_ARRAY(struct sam_database_info, db_count);
581
582                                 if (db_info == NULL) {
583                                         DEBUG(3, ("out of memory allocating info for %d databases\n", db_count));
584                                         return;
585                                 }
586           
587                                 for (i = 0; i < db_count; i++) {
588                                         db_info[i].index = IVAL(q, 0);
589                                         db_info[i].serial_lo = IVAL(q, 4);
590                                         db_info[i].serial_hi = IVAL(q, 8);
591                                         db_info[i].date_lo = IVAL(q, 12);
592                                         db_info[i].date_hi = IVAL(q, 16);
593                                         q += 20;
594                                 }
595
596                                 /* Domain SID */
597
598 #if 0
599                                 /* We must range check this. */
600                                 q += IVAL(q, 0) + 4;  /* 4 byte length plus data */
601           
602                                 q += 2;               /* Alignment? */
603
604                                 /* Misc other info */
605
606                                 q += 4;               /* NT version (0x1) */
607                                 q += 2;               /* LMNT token (0xff) */
608                                 q += 2;               /* LM20 token (0xff) */
609 #endif
610
611                                 SAFE_FREE(db_info);        /* Not sure whether we need to do anything useful with these */
612
613                                 /* Send message to smbd */
614
615                                 send_repl_message(low_serial);
616                                 break;
617                         }
618
619                 default:
620                         DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
621                         return;
622         }
623 }