source/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 1994-1998
   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 static void send_repl_message(uint32 low_serial)
  39 {
  40         TDB_CONTEXT *tdb;
  41
  42         tdb = tdb_open_log(lock_path("connections.tdb"), 0,
  43                            TDB_DEFAULT, O_RDONLY, 0);
  44
  45         if (!tdb) {
  46                 DEBUG(3, ("send_repl_message(): failed to open connections "
  47                           "database\n"));
  48                 return;
  49         }
  50
  51         DEBUG(3, ("sending replication message, serial = 0x%04x\n",
  52                   low_serial));
  53
  54         message_send_all(tdb, MSG_SMB_SAM_REPL, &low_serial,
  55                          sizeof(low_serial), False, NULL);
  56
  57         tdb_close(tdb);
  58 }
  59
  60 /****************************************************************************
  61 Process a domain logon packet
  62 **************************************************************************/
  63
  64 void process_logon_packet(struct packet_struct *p, char *buf,int len,
  65                           const char *mailslot)
  66 {
  67   struct dgram_packet *dgram = &p->packet.dgram;
  68   pstring my_name;
  69   fstring reply_name;
  70   pstring outbuf;
  71   int code;
  72   uint16 token = 0;
  73   uint32 ntversion = 0;
  74   uint16 lmnttoken = 0;
  75   uint16 lm20token = 0;
  76   uint32 domainsidsize;
  77   BOOL short_request = False;
  78   char *getdc;
  79   char *uniuser; /* Unicode user name. */
  80   pstring ascuser;
  81   char *unicomp; /* Unicode computer name. */
  82
  83   memset(outbuf, 0, sizeof(outbuf));
  84
  85   if (!lp_domain_logons())
  86   {
  87     DEBUG(3,("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 = SVAL(buf,0);
  95   DEBUG(1,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
  96
  97   switch (code)
  98   {
  99     case 0:
 100     {
 101       char *q = buf + 2;
 102       char *machine = q;
 103       char *user = skip_string(machine,1);
 104
 105       getdc = skip_string(user,1);
 106       q = skip_string(getdc,1);
 107       token = SVAL(q,3);
 108
 109       fstrcpy(reply_name,my_name);
 110
 111       DEBUG(3,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
 112              machine,inet_ntoa(p->ip),user,token));
 113
 114       q = outbuf;
 115       SSVAL(q, 0, 6);
 116       q += 2;
 117
 118       fstrcpy(reply_name, "\\\\");
 119       fstrcat(reply_name, my_name);
 120       fstrcpy(q, reply_name); q = skip_string(q, 1); /* PDC name */
 121
 122       SSVAL(q, 0, token);
 123       q += 2;
 124
 125       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 126
 127       send_mailslot(True, getdc,
 128                     outbuf,PTR_DIFF(q,outbuf),
 129                     global_myname(), 0x0,
 130                                         machine,
 131                     dgram->source_name.name_type,
 132                     p->ip, *iface_ip(p->ip), p->port);
 133       break;
 134     }
 135
 136     case QUERYFORPDC:
 137     {
 138       char *q = buf + 2;
 139       char *machine = q;
 140
 141       if (!lp_domain_master())
 142       {
 143          /* We're not Primary Domain Controller -- ignore this */
 144          return;
 145       }
 146
 147       getdc = skip_string(machine,1);
 148       q = skip_string(getdc,1);
 149       q = ALIGN2(q, buf);
 150
 151       /* at this point we can work out if this is a W9X or NT style
 152          request. Experiments show that the difference is wether the
 153          packet ends here. For a W9X request we now end with a pair of
 154          bytes (usually 0xFE 0xFF) whereas with NT we have two further
 155          strings - the following is a simple way of detecting this */
 156       if (len - PTR_DIFF(q, buf) <= 3) {
 157               short_request = True;
 158       } else {
 159               unicomp = q;
 160
 161               /* A full length (NT style) request */
 162               q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 163
 164               if (len - PTR_DIFF(q, buf) > 8) {
 165                                         /* with NT5 clients we can sometimes
 166                                            get additional data - a length specificed string
 167                                            containing the domain name, then 16 bytes of
 168                                            data (no idea what it is) */
 169                                         int dom_len = CVAL(q, 0);
 170                                         q++;
 171                                         if (dom_len != 0) {
 172                                                 q += dom_len + 1;
 173                                         }
 174                                         q += 16;
 175               }
 176               ntversion = IVAL(q, 0);
 177               lmnttoken = SVAL(q, 4);
 178               lm20token = SVAL(q, 6);
 179       }
 180
 181       /* Construct reply. */
 182       q = outbuf;
 183       SSVAL(q, 0, QUERYFORPDC_R);
 184       q += 2;
 185
 186       fstrcpy(reply_name,my_name);
 187       fstrcpy(q, reply_name);
 188       q = skip_string(q, 1); /* PDC name */
 189
 190       /* PDC and domain name */
 191       if (!short_request)  /* Make a full reply */
 192       {
 193         q = ALIGN2(q, outbuf);
 194
 195         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 196         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True); /* Domain name*/
 197         SIVAL(q, 0, 1); /* our nt version */
 198         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 199         SSVAL(q, 6, 0xffff); /* our lm20token */
 200         q += 8;
 201       }
 202
 203       /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 204
 205       DEBUG(3,("process_logon_packet: GETDC request from %s at IP %s, \
 206 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 207             machine,inet_ntoa(p->ip), reply_name, lp_workgroup(),
 208             QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 209             (uint32)lm20token ));
 210
 211       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 212
 213       send_mailslot(True, getdc,
 214                   outbuf,PTR_DIFF(q,outbuf),
 215                     global_myname(), 0x0,
 216                   dgram->source_name.name,
 217                   dgram->source_name.name_type,
 218                   p->ip, *iface_ip(p->ip), p->port);
 219       return;
 220     }
 221
 222     case SAMLOGON:
 223     {
 224       char *q = buf + 2;
 225       fstring asccomp;
 226
 227       q += 2;
 228       unicomp = q;
 229       uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 230       getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 231       q = skip_string(getdc,1);
 232       q += 4; /* Account Control Bits - indicating username type */
 233       domainsidsize = IVAL(q, 0);
 234       q += 4;
 235
 236       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 237
 238       if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 239               q += domainsidsize;
 240               q = ALIGN4(q, buf);
 241       }
 242
 243       DEBUG(3,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %d\n", len, PTR_DIFF(q, buf) ));
 244
 245       if (len - PTR_DIFF(q, buf) > 8) {
 246               /* with NT5 clients we can sometimes
 247                  get additional data - a length specificed string
 248                  containing the domain name, then 16 bytes of
 249                  data (no idea what it is) */
 250               int dom_len = CVAL(q, 0);
 251               q++;
 252               if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 253                       q += dom_len + 1;
 254               }
 255               q += 16;
 256       }
 257
 258       ntversion = IVAL(q, 0);
 259       lmnttoken = SVAL(q, 4);
 260       lm20token = SVAL(q, 6);
 261       q += 8;
 262
 263       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 264
 265       /*
 266        * we respond regadless of whether the machine is in our password
 267        * database. If it isn't then we let smbd send an appropriate error.
 268        * Let's ignore the SID.
 269        */
 270       pull_ucs2_pstring(ascuser, uniuser);
 271       pull_ucs2_fstring(asccomp, unicomp);
 272       DEBUG(3,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 273
 274       fstrcpy(reply_name, "\\\\"); /* Here it wants \\LOGONSERVER. */
 275       fstrcat(reply_name, my_name);
 276
 277       DEBUG(3,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 278                asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
 279                SAMLOGON_R ,lmnttoken));
 280
 281       /* Construct reply. */
 282
 283       q = outbuf;
 284       /* we want the simple version unless we are an ADS PDC..which means  */
 285       /* never, at least for now */
 286       if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
 287         if (SVAL(uniuser, 0) == 0) {
 288           SSVAL(q, 0, SAMLOGON_UNK_R);  /* user unknown */
 289         } else {
 290           SSVAL(q, 0, SAMLOGON_R);
 291         }
 292
 293         q += 2;
 294
 295         q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
 296         q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
 297         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True);
 298       }
 299 #ifdef HAVE_ADS
 300       else {
 301         GUID domain_guid;
 302         pstring domain;
 303         pstring hostname;
 304         char *component, *dc, *q1;
 305         uint8 size;
 306         char *q_orig = q;
 307         int str_offset;
 308
 309         get_mydomname(domain);
 310         get_myname(hostname);
 311
 312         if (SVAL(uniuser, 0) == 0) {
 313           SIVAL(q, 0, SAMLOGON_AD_UNK_R);       /* user unknown */
 314         } else {
 315           SIVAL(q, 0, SAMLOGON_AD_R);
 316         }
 317         q += 4;
 318
 319         SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
 320                     ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
 321         q += 4;
 322
 323         /* Push Domain GUID */
 324         if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
 325           DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
 326           return;
 327         }
 328         memcpy(q, &domain_guid, sizeof(domain_guid));
 329         q += sizeof(domain_guid);
 330
 331         /* Forest */
 332         str_offset = q - q_orig;
 333         dc = domain;
 334         q1 = q;
 335         while ((component = strtok(dc, "."))) {
 336           dc = NULL;
 337           size = push_ascii(&q[1], component, -1, 0);
 338           SCVAL(q, 0, size);
 339           q += (size + 1);
 340         }
 341
 342         /* Unk0 */
 343         SCVAL(q, 0, 0); q++;
 344
 345         /* Domain */
 346         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 347         SCVAL(q, 1, str_offset & 0xFF);
 348         q += 2;
 349
 350         /* Hostname */
 351         size = push_ascii(&q[1], hostname, -1, 0);
 352         SCVAL(q, 0, size);
 353         q += (size + 1);
 354         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 355         SCVAL(q, 1, str_offset & 0xFF);
 356         q += 2;
 357
 358         /* NETBIOS of domain */
 359         size = push_ascii(&q[1], lp_workgroup(), -1, STR_UPPER);
 360         SCVAL(q, 0, size);
 361         q += (size + 1);
 362
 363         /* Unk1 */
 364         SCVAL(q, 0, 0); q++;
 365
 366         /* NETBIOS of hostname */
 367         size = push_ascii(&q[1], my_name, -1, 0);
 368         SCVAL(q, 0, size);
 369         q += (size + 1);
 370
 371         /* Unk2 */
 372         SCVAL(q, 0, 0); q++;
 373
 374         /* User name */
 375         if (SVAL(uniuser, 0) != 0) {
 376                 size = push_ascii(&q[1], ascuser, -1, 0);
 377                 SCVAL(q, 0, size);
 378                 q += (size + 1);
 379         }
 380
 381         q_orig = q;
 382         /* Site name */
 383         size = push_ascii(&q[1], "Default-First-Site-Name", -1, 0);
 384         SCVAL(q, 0, size);
 385         q += (size + 1);
 386
 387         /* Site name (2) */
 388         str_offset = q - q_orig;
 389         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 390         SCVAL(q, 1, str_offset & 0xFF);
 391         q += 2;
 392
 393         SCVAL(q, 0, PTR_DIFF(q,q1));
 394         SCVAL(q, 1, 0x10); /* unknown */
 395
 396         SIVAL(q, 0, 0x00000002); q += 4; /* unknown */
 397         SIVAL(q, 0, (iface_ip(p->ip))->s_addr); q += 4;
 398         SIVAL(q, 0, 0x00000000); q += 4; /* unknown */
 399         SIVAL(q, 0, 0x00000000); q += 4; /* unknown */
 400       }
 401 #endif
 402
 403       /* tell the client what version we are */
 404       SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13);
 405       /* our ntversion */
 406       SSVAL(q, 4, 0xffff); /* our lmnttoken */
 407       SSVAL(q, 6, 0xffff); /* our lm20token */
 408       q += 8;
 409
 410       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 411
 412       send_mailslot(True, getdc,
 413                    outbuf,PTR_DIFF(q,outbuf),
 414                     global_myname(), 0x0,
 415                    dgram->source_name.name,
 416                    dgram->source_name.name_type,
 417                    p->ip, *iface_ip(p->ip), p->port);
 418       break;
 419     }
 420
 421     /* Announce change to UAS or SAM.  Send by the domain controller when a
 422        replication event is required. */
 423
 424   case SAM_UAS_CHANGE: {
 425           struct sam_database_info *db_info;
 426           char *q = buf + 2;
 427           int i, db_count;
 428           uint32 low_serial;
 429
 430           /* Header */
 431
 432           low_serial = IVAL(q, 0); q += 4;     /* Low serial number */
 433
 434           q += 4;                   /* Date/time */
 435           q += 4;                   /* Pulse */
 436           q += 4;                   /* Random */
 437
 438           /* Domain info */
 439
 440           q = skip_string(q, 1);    /* PDC name */
 441           q = skip_string(q, 1);    /* Domain name */
 442           q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode PDC name */
 443           q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode domain name */
 444
 445           /* Database info */
 446
 447           db_count = SVAL(q, 0); q += 2;
 448
 449           db_info = (struct sam_database_info *)
 450                   malloc(sizeof(struct sam_database_info) * db_count);
 451
 452           if (db_info == NULL) {
 453                   DEBUG(3, ("out of memory allocating info for %d databases\n",
 454                             db_count));
 455                   return;
 456           }
 457
 458           for (i = 0; i < db_count; i++) {
 459                   db_info[i].index = IVAL(q, 0);
 460                   db_info[i].serial_lo = IVAL(q, 4);
 461                   db_info[i].serial_hi = IVAL(q, 8);
 462                   db_info[i].date_lo = IVAL(q, 12);
 463                   db_info[i].date_hi = IVAL(q, 16);
 464                   q += 20;
 465           }
 466
 467           /* Domain SID */
 468
 469           q += IVAL(q, 0) + 4;  /* 4 byte length plus data */
 470
 471           q += 2;               /* Alignment? */
 472
 473           /* Misc other info */
 474
 475           q += 4;               /* NT version (0x1) */
 476           q += 2;               /* LMNT token (0xff) */
 477           q += 2;               /* LM20 token (0xff) */
 478
 479           SAFE_FREE(db_info);        /* Not sure whether we need to do anything
 480                                    useful with these */
 481
 482           /* Send message to smbd */
 483
 484           send_repl_message(low_serial);
 485
 486           break;
 487   }
 488
 489     default:
 490     {
 491       DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 492       return;
 493     }
 494   }
 495 }