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(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                 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(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                                 pull_ascii_fstring(mach_str, machine);
 112                                 pull_ascii_fstring(user_str, user);
 113                                 pull_ascii_fstring(getdc_str, getdc);
 114
 115                                 DEBUG(3,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
 116                                         mach_str,inet_ntoa(p->ip),user_str,token));
 117
 118                                 q = outbuf;
 119                                 SSVAL(q, 0, 6);
 120                                 q += 2;
 121
 122                                 fstrcpy(reply_name, "\\\\");
 123                                 fstrcat(reply_name, my_name);
 124                                 push_ascii_fstring(q, reply_name);
 125                                 q = skip_string(q, 1); /* PDC name */
 126
 127                                 SSVAL(q, 0, token);
 128                                 q += 2;
 129
 130                                 dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 131
 132                                 send_mailslot(True, getdc_str,
 133                                                 outbuf,PTR_DIFF(q,outbuf),
 134                                                 global_myname(), 0x0,
 135                                                 mach_str,
 136                                                 dgram->source_name.name_type,
 137                                                 p->ip, *iface_ip(p->ip), p->port);
 138                                 break;
 139                         }
 140
 141                 case QUERYFORPDC:
 142                         {
 143                                 fstring mach_str, getdc_str;
 144                                 nstring source_name;
 145                                 char *q = buf + 2;
 146                                 char *machine = q;
 147
 148                                 if (!lp_domain_master()) {
 149                                         /* We're not Primary Domain Controller -- ignore this */
 150                                         return;
 151                                 }
 152
 153                                 getdc = skip_string(machine,1);
 154                                 q = skip_string(getdc,1);
 155                                 q = ALIGN2(q, buf);
 156
 157                                 /* At this point we can work out if this is a W9X or NT style
 158                                    request. Experiments show that the difference is wether the
 159                                    packet ends here. For a W9X request we now end with a pair of
 160                                    bytes (usually 0xFE 0xFF) whereas with NT we have two further
 161                                    strings - the following is a simple way of detecting this */
 162
 163                                 if (len - PTR_DIFF(q, buf) <= 3) {
 164                                         short_request = True;
 165                                 } else {
 166                                         unicomp = q;
 167
 168                                         /* A full length (NT style) request */
 169                                         q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 170
 171                                         if (len - PTR_DIFF(q, buf) > 8) {
 172                                                 /* with NT5 clients we can sometimes
 173                                                         get additional data - a length specificed string
 174                                                         containing the domain name, then 16 bytes of
 175                                                         data (no idea what it is) */
 176                                                 int dom_len = CVAL(q, 0);
 177                                                 q++;
 178                                                 if (dom_len != 0) {
 179                                                         q += dom_len + 1;
 180                                                 }
 181                                                 q += 16;
 182                                         }
 183                                         ntversion = IVAL(q, 0);
 184                                         lmnttoken = SVAL(q, 4);
 185                                         lm20token = SVAL(q, 6);
 186                                 }
 187
 188                                 /* Construct reply. */
 189                                 q = outbuf;
 190                                 SSVAL(q, 0, QUERYFORPDC_R);
 191                                 q += 2;
 192
 193                                 fstrcpy(reply_name,my_name);
 194                                 push_ascii_fstring(q, reply_name);
 195                                 q = skip_string(q, 1); /* PDC name */
 196
 197                                 /* PDC and domain name */
 198                                 if (!short_request) {
 199                                         /* Make a full reply */
 200                                         q = ALIGN2(q, outbuf);
 201
 202                                         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 203                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True); /* Domain name*/
 204                                         SIVAL(q, 0, 1); /* our nt version */
 205                                         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 206                                         SSVAL(q, 6, 0xffff); /* our lm20token */
 207                                         q += 8;
 208                                 }
 209
 210                                 /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 211
 212                                 pull_ascii_fstring(mach_str, machine);
 213
 214                                 DEBUG(3,("process_logon_packet: GETDC request from %s at IP %s, \
 215 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 216                                         mach_str,inet_ntoa(p->ip), reply_name, lp_workgroup(),
 217                                         QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 218                                         (uint32)lm20token ));
 219
 220                                 dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 221
 222                                 pull_ascii_fstring(getdc_str, getdc);
 223                                 pull_ascii_nstring(source_name, dgram->source_name.name);
 224
 225                                 send_mailslot(True, getdc_str,
 226                                         outbuf,PTR_DIFF(q,outbuf),
 227                                         global_myname(), 0x0,
 228                                         source_name,
 229                                         dgram->source_name.name_type,
 230                                         p->ip, *iface_ip(p->ip), p->port);
 231                                 return;
 232                         }
 233
 234                 case SAMLOGON:
 235
 236                         {
 237                                 fstring getdc_str;
 238                                 nstring source_name;
 239                                 char *q = buf + 2;
 240                                 fstring asccomp;
 241
 242                                 q += 2;
 243                                 unicomp = q;
 244                                 uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 245                                 getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 246                                 q = skip_string(getdc,1);
 247                                 q += 4; /* Account Control Bits - indicating username type */
 248                                 domainsidsize = IVAL(q, 0);
 249                                 q += 4;
 250
 251                                 DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 252
 253                                 if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 254                                         q += domainsidsize;
 255                                         q = ALIGN4(q, buf);
 256                                 }
 257
 258                                 DEBUG(3,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %ld\n", len, (unsigned long)PTR_DIFF(q, buf) ));
 259
 260                                 if (len - PTR_DIFF(q, buf) > 8) {
 261                                         /* with NT5 clients we can sometimes
 262                                                 get additional data - a length specificed string
 263                                                 containing the domain name, then 16 bytes of
 264                                                 data (no idea what it is) */
 265                                         int dom_len = CVAL(q, 0);
 266                                         q++;
 267                                         if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 268                                                 q += dom_len + 1;
 269                                         }
 270                                         q += 16;
 271                                 }
 272
 273                                 ntversion = IVAL(q, 0);
 274                                 lmnttoken = SVAL(q, 4);
 275                                 lm20token = SVAL(q, 6);
 276                                 q += 8;
 277
 278                                 DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 279
 280                                 /*
 281                                  * we respond regadless of whether the machine is in our password
 282                                  * database. If it isn't then we let smbd send an appropriate error.
 283                                  * Let's ignore the SID.
 284                                  */
 285                                 pull_ucs2_pstring(ascuser, uniuser);
 286                                 pull_ucs2_fstring(asccomp, unicomp);
 287                                 DEBUG(3,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 288
 289                                 fstrcpy(reply_name, "\\\\"); /* Here it wants \\LOGONSERVER. */
 290                                 fstrcat(reply_name, my_name);
 291
 292                                 DEBUG(3,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 293                                         asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
 294                                 SAMLOGON_R ,lmnttoken));
 295
 296                                 /* Construct reply. */
 297
 298                                 q = outbuf;
 299                                 /* we want the simple version unless we are an ADS PDC..which means  */
 300                                 /* never, at least for now */
 301                                 if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
 302                                         if (SVAL(uniuser, 0) == 0) {
 303                                                 SSVAL(q, 0, SAMLOGON_UNK_R);    /* user unknown */
 304                                         } else {
 305                                                 SSVAL(q, 0, SAMLOGON_R);
 306                                         }
 307
 308                                         q += 2;
 309
 310                                         q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
 311                                         q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
 312                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True);
 313                                 }
 314 #ifdef HAVE_ADS
 315                                 else {
 316                                         GUID domain_guid;
 317                                         pstring domain;
 318                                         pstring hostname;
 319                                         char *component, *dc, *q1;
 320                                         uint8 size;
 321                                         char *q_orig = q;
 322                                         int str_offset;
 323
 324                                         get_mydomname(domain);
 325                                         get_myname(hostname);
 326
 327                                         if (SVAL(uniuser, 0) == 0) {
 328                                                 SIVAL(q, 0, SAMLOGON_AD_UNK_R); /* user unknown */
 329                                         } else {
 330                                                 SIVAL(q, 0, SAMLOGON_AD_R);
 331                                         }
 332                                         q += 4;
 333
 334                                         SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
 335                                                 ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
 336                                         q += 4;
 337
 338                                         /* Push Domain GUID */
 339                                         if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
 340                                                 DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
 341                                                 return;
 342                                         }
 343                                         memcpy(q, &domain_guid, sizeof(domain_guid));
 344                                         q += sizeof(domain_guid);
 345
 346                                         /* Forest */
 347                                         str_offset = q - q_orig;
 348                                         dc = domain;
 349                                         q1 = q;
 350                                         while ((component = strtok(dc, "."))) {
 351                                                 dc = NULL;
 352                                                 size = push_ascii(&q[1], component, -1, 0);
 353                                                 SCVAL(q, 0, size);
 354                                                 q += (size + 1);
 355                                         }
 356
 357                                         /* Unk0 */
 358                                         SCVAL(q, 0, 0);
 359                                         q++;
 360
 361                                         /* Domain */
 362                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 363                                         SCVAL(q, 1, str_offset & 0xFF);
 364                                         q += 2;
 365
 366                                         /* Hostname */
 367                                         size = push_ascii(&q[1], hostname, -1, 0);
 368                                         SCVAL(q, 0, size);
 369                                         q += (size + 1);
 370                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 371                                         SCVAL(q, 1, str_offset & 0xFF);
 372                                         q += 2;
 373
 374                                         /* NETBIOS of domain */
 375                                         size = push_ascii(&q[1], lp_workgroup(), -1, STR_UPPER);
 376                                         SCVAL(q, 0, size);
 377                                         q += (size + 1);
 378
 379                                         /* Unk1 */
 380                                         SCVAL(q, 0, 0);
 381                                         q++;
 382
 383                                         /* NETBIOS of hostname */
 384                                         size = push_ascii(&q[1], my_name, -1, 0);
 385                                         SCVAL(q, 0, size);
 386                                         q += (size + 1);
 387
 388                                         /* Unk2 */
 389                                         SCVAL(q, 0, 0);
 390                                         q++;
 391
 392                                         /* User name */
 393                                         if (SVAL(uniuser, 0) != 0) {
 394                                                 size = push_ascii(&q[1], ascuser, -1, 0);
 395                                                 SCVAL(q, 0, size);
 396                                                 q += (size + 1);
 397                                         }
 398
 399                                         q_orig = q;
 400                                         /* Site name */
 401                                         size = push_ascii(&q[1], "Default-First-Site-Name", -1, 0);
 402                                         SCVAL(q, 0, size);
 403                                         q += (size + 1);
 404
 405                                         /* Site name (2) */
 406                                         str_offset = q - q_orig;
 407                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 408                                         SCVAL(q, 1, str_offset & 0xFF);
 409                                         q += 2;
 410
 411                                         SCVAL(q, 0, PTR_DIFF(q,q1));
 412                                         SCVAL(q, 1, 0x10); /* unknown */
 413
 414                                         SIVAL(q, 0, 0x00000002);
 415                                         q += 4; /* unknown */
 416                                         SIVAL(q, 0, (iface_ip(p->ip))->s_addr);
 417                                         q += 4;
 418                                         SIVAL(q, 0, 0x00000000);
 419                                         q += 4; /* unknown */
 420                                         SIVAL(q, 0, 0x00000000);
 421                                         q += 4; /* unknown */
 422                                 }
 423 #endif
 424
 425                                 /* tell the client what version we are */
 426                                 SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13);
 427                                 /* our ntversion */
 428                                 SSVAL(q, 4, 0xffff); /* our lmnttoken */
 429                                 SSVAL(q, 6, 0xffff); /* our lm20token */
 430                                 q += 8;
 431
 432                                 dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 433
 434                                 pull_ascii_fstring(getdc_str, getdc);
 435                                 pull_ascii_nstring(source_name, dgram->source_name.name);
 436
 437                                 send_mailslot(True, getdc,
 438                                         outbuf,PTR_DIFF(q,outbuf),
 439                                         global_myname(), 0x0,
 440                                         dgram->source_name.name,
 441                                         dgram->source_name.name_type,
 442                                         p->ip, *iface_ip(p->ip), p->port);
 443                                 break;
 444                         }
 445
 446                 /* Announce change to UAS or SAM.  Send by the domain controller when a
 447                 replication event is required. */
 448
 449                 case SAM_UAS_CHANGE:
 450                         {
 451                                 struct sam_database_info *db_info;
 452                                 char *q = buf + 2;
 453                                 int i, db_count;
 454                                 uint32 low_serial;
 455
 456                                 /* Header */
 457
 458                                 low_serial = IVAL(q, 0); q += 4;     /* Low serial number */
 459
 460                                 q += 4;                   /* Date/time */
 461                                 q += 4;                   /* Pulse */
 462                                 q += 4;                   /* Random */
 463
 464                                 /* Domain info */
 465
 466                                 q = skip_string(q, 1);    /* PDC name */
 467                                 q = skip_string(q, 1);    /* Domain name */
 468                                 q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode PDC name */
 469                                 q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode domain name */
 470
 471                                 /* Database info */
 472
 473                                 db_count = SVAL(q, 0); q += 2;
 474
 475                                 db_info = (struct sam_database_info *)
 476                                                 malloc(sizeof(struct sam_database_info) * db_count);
 477
 478                                 if (db_info == NULL) {
 479                                         DEBUG(3, ("out of memory allocating info for %d databases\n", db_count));
 480                                         return;
 481                                 }
 482
 483                                 for (i = 0; i < db_count; i++) {
 484                                         db_info[i].index = IVAL(q, 0);
 485                                         db_info[i].serial_lo = IVAL(q, 4);
 486                                         db_info[i].serial_hi = IVAL(q, 8);
 487                                         db_info[i].date_lo = IVAL(q, 12);
 488                                         db_info[i].date_hi = IVAL(q, 16);
 489                                         q += 20;
 490                                 }
 491
 492                                 /* Domain SID */
 493
 494 #if 0
 495                                 /* We must range check this. */
 496                                 q += IVAL(q, 0) + 4;  /* 4 byte length plus data */
 497
 498                                 q += 2;               /* Alignment? */
 499
 500                                 /* Misc other info */
 501
 502                                 q += 4;               /* NT version (0x1) */
 503                                 q += 2;               /* LMNT token (0xff) */
 504                                 q += 2;               /* LM20 token (0xff) */
 505 #endif
 506
 507                                 SAFE_FREE(db_info);        /* Not sure whether we need to do anything useful with these */
 508
 509                                 /* Send message to smbd */
 510
 511                                 send_repl_message(low_serial);
 512                                 break;
 513                         }
 514
 515                 default:
 516                         DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 517                         return;
 518         }
 519 }