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 3 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, see <http://www.gnu.org/licenses/>.
  21
  22    Revision History:
  23
  24 */
  25
  26 #include "includes.h"
  27
  28 struct sam_database_info {
  29         uint32 index;
  30         uint32 serial_lo, serial_hi;
  31         uint32 date_lo, date_hi;
  32 };
  33
  34 /****************************************************************************
  35 Process a domain logon packet
  36 **************************************************************************/
  37
  38 void process_logon_packet(struct packet_struct *p, char *buf,int len,
  39                           const char *mailslot)
  40 {
  41         struct dgram_packet *dgram = &p->packet.dgram;
  42         pstring my_name;
  43         fstring reply_name;
  44         pstring outbuf;
  45         int code;
  46         uint16 token = 0;
  47         uint32 ntversion = 0;
  48         uint16 lmnttoken = 0;
  49         uint16 lm20token = 0;
  50         uint32 domainsidsize;
  51         BOOL short_request = False;
  52         char *getdc;
  53         char *uniuser; /* Unicode user name. */
  54         pstring ascuser;
  55         char *unicomp; /* Unicode computer name. */
  56
  57         memset(outbuf, 0, sizeof(outbuf));
  58
  59         if (!lp_domain_logons()) {
  60                 DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
  61 logons are not enabled.\n", inet_ntoa(p->ip) ));
  62                 return;
  63         }
  64
  65         pstrcpy(my_name, global_myname());
  66
  67         code = get_safe_SVAL(buf,len,buf,0,-1);
  68         DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
  69
  70         switch (code) {
  71                 case 0:
  72                         {
  73                                 fstring mach_str, user_str, getdc_str;
  74                                 char *q = buf + 2;
  75                                 char *machine = q;
  76                                 char *user = skip_string(buf,len,machine);
  77
  78                                 if (!user || PTR_DIFF(user, buf) >= len) {
  79                                         DEBUG(0,("process_logon_packet: bad packet\n"));
  80                                         return;
  81                                 }
  82                                 getdc = skip_string(buf,len,user);
  83
  84                                 if (!getdc || PTR_DIFF(getdc, buf) >= len) {
  85                                         DEBUG(0,("process_logon_packet: bad packet\n"));
  86                                         return;
  87                                 }
  88                                 q = skip_string(buf,len,getdc);
  89
  90                                 if (!q || PTR_DIFF(q + 5, buf) > len) {
  91                                         DEBUG(0,("process_logon_packet: bad packet\n"));
  92                                         return;
  93                                 }
  94                                 token = SVAL(q,3);
  95
  96                                 fstrcpy(reply_name,my_name);
  97
  98                                 pull_ascii_fstring(mach_str, machine);
  99                                 pull_ascii_fstring(user_str, user);
 100                                 pull_ascii_fstring(getdc_str, getdc);
 101
 102                                 DEBUG(5,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
 103                                         mach_str,inet_ntoa(p->ip),user_str,token));
 104
 105                                 q = outbuf;
 106                                 SSVAL(q, 0, 6);
 107                                 q += 2;
 108
 109                                 fstrcpy(reply_name, "\\\\");
 110                                 fstrcat(reply_name, my_name);
 111                                 push_ascii(q,reply_name,
 112                                                 sizeof(outbuf)-PTR_DIFF(q, outbuf),
 113                                                 STR_TERMINATE);
 114                                 q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
 115
 116                                 SSVAL(q, 0, token);
 117                                 q += 2;
 118
 119                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 120
 121                                 send_mailslot(True, getdc_str,
 122                                                 outbuf,PTR_DIFF(q,outbuf),
 123                                                 global_myname(), 0x0,
 124                                                 mach_str,
 125                                                 dgram->source_name.name_type,
 126                                                 p->ip, *iface_ip(p->ip), p->port);
 127                                 break;
 128                         }
 129
 130                 case QUERYFORPDC:
 131                         {
 132                                 fstring mach_str, getdc_str;
 133                                 fstring source_name;
 134                                 char *q = buf + 2;
 135                                 char *machine = q;
 136
 137                                 if (!lp_domain_master()) {
 138                                         /* We're not Primary Domain Controller -- ignore this */
 139                                         return;
 140                                 }
 141
 142                                 getdc = skip_string(buf,len,machine);
 143
 144                                 if (!getdc || PTR_DIFF(getdc, buf) >= len) {
 145                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 146                                         return;
 147                                 }
 148                                 q = skip_string(buf,len,getdc);
 149
 150                                 if (!q || PTR_DIFF(q, buf) >= len) {
 151                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 152                                         return;
 153                                 }
 154                                 q = ALIGN2(q, buf);
 155
 156                                 /* At this point we can work out if this is a W9X or NT style
 157                                    request. Experiments show that the difference is wether the
 158                                    packet ends here. For a W9X request we now end with a pair of
 159                                    bytes (usually 0xFE 0xFF) whereas with NT we have two further
 160                                    strings - the following is a simple way of detecting this */
 161
 162                                 if (len - PTR_DIFF(q, buf) <= 3) {
 163                                         short_request = True;
 164                                 } else {
 165                                         unicomp = q;
 166
 167                                         if (PTR_DIFF(q, buf) >= len) {
 168                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 169                                                 return;
 170                                         }
 171
 172                                         /* A full length (NT style) request */
 173                                         q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 174
 175                                         if (PTR_DIFF(q, buf) >= len) {
 176                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 177                                                 return;
 178                                         }
 179
 180                                         if (len - PTR_DIFF(q, buf) > 8) {
 181                                                 /* with NT5 clients we can sometimes
 182                                                         get additional data - a length specificed string
 183                                                         containing the domain name, then 16 bytes of
 184                                                         data (no idea what it is) */
 185                                                 int dom_len = CVAL(q, 0);
 186                                                 q++;
 187                                                 if (dom_len != 0) {
 188                                                         q += dom_len + 1;
 189                                                 }
 190                                                 q += 16;
 191                                         }
 192
 193                                         if (PTR_DIFF(q + 8, buf) > len) {
 194                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 195                                                 return;
 196                                         }
 197
 198                                         ntversion = IVAL(q, 0);
 199                                         lmnttoken = SVAL(q, 4);
 200                                         lm20token = SVAL(q, 6);
 201                                 }
 202
 203                                 /* Construct reply. */
 204                                 q = outbuf;
 205                                 SSVAL(q, 0, QUERYFORPDC_R);
 206                                 q += 2;
 207
 208                                 fstrcpy(reply_name,my_name);
 209                                 push_ascii(q, reply_name,
 210                                                 sizeof(outbuf)-PTR_DIFF(q, outbuf),
 211                                                 STR_TERMINATE);
 212                                 q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
 213
 214                                 /* PDC and domain name */
 215                                 if (!short_request) {
 216                                         /* Make a full reply */
 217                                         q = ALIGN2(q, outbuf);
 218
 219                                         q += dos_PutUniCode(q, my_name,
 220                                                 sizeof(pstring) - PTR_DIFF(q, outbuf),
 221                                                 True); /* PDC name */
 222                                         q += dos_PutUniCode(q, lp_workgroup(),
 223                                                 sizeof(pstring) - (q-outbuf),
 224                                                 True); /* Domain name*/
 225                                         if (sizeof(pstring) - PTR_DIFF(q, outbuf) < 8) {
 226                                                 return;
 227                                         }
 228                                         SIVAL(q, 0, 1); /* our nt version */
 229                                         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 230                                         SSVAL(q, 6, 0xffff); /* our lm20token */
 231                                         q += 8;
 232                                 }
 233
 234                                 /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 235
 236                                 pull_ascii_fstring(mach_str, machine);
 237
 238                                 DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, \
 239 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 240                                         mach_str,inet_ntoa(p->ip), reply_name, lp_workgroup(),
 241                                         QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 242                                         (uint32)lm20token ));
 243
 244                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 245
 246                                 pull_ascii_fstring(getdc_str, getdc);
 247                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 248
 249                                 send_mailslot(True, getdc_str,
 250                                         outbuf,PTR_DIFF(q,outbuf),
 251                                         global_myname(), 0x0,
 252                                         source_name,
 253                                         dgram->source_name.name_type,
 254                                         p->ip, *iface_ip(p->ip), p->port);
 255                                 return;
 256                         }
 257
 258                 case SAMLOGON:
 259
 260                         {
 261                                 fstring getdc_str;
 262                                 fstring source_name;
 263                                 char *q = buf + 2;
 264                                 fstring asccomp;
 265
 266                                 q += 2;
 267
 268                                 if (PTR_DIFF(q, buf) >= len) {
 269                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 270                                         return;
 271                                 }
 272
 273                                 unicomp = q;
 274                                 uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 275
 276                                 if (PTR_DIFF(uniuser, buf) >= len) {
 277                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 278                                         return;
 279                                 }
 280
 281                                 getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 282
 283                                 if (PTR_DIFF(getdc, buf) >= len) {
 284                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 285                                         return;
 286                                 }
 287
 288                                 q = skip_string(buf,len,getdc);
 289
 290                                 if (!q || PTR_DIFF(q + 8, buf) >= len) {
 291                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 292                                         return;
 293                                 }
 294
 295                                 q += 4; /* Account Control Bits - indicating username type */
 296                                 domainsidsize = IVAL(q, 0);
 297                                 q += 4;
 298
 299                                 DEBUG(5,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 300
 301                                 if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 302                                         q += domainsidsize;
 303                                         q = ALIGN4(q, buf);
 304                                 }
 305
 306                                 DEBUG(5,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %ld\n", len, (unsigned long)PTR_DIFF(q, buf) ));
 307
 308                                 if (len - PTR_DIFF(q, buf) > 8) {
 309                                         /* with NT5 clients we can sometimes
 310                                                 get additional data - a length specificed string
 311                                                 containing the domain name, then 16 bytes of
 312                                                 data (no idea what it is) */
 313                                         int dom_len = CVAL(q, 0);
 314                                         q++;
 315                                         if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 316                                                 q += dom_len + 1;
 317                                         }
 318                                         q += 16;
 319                                 }
 320
 321                                 if (PTR_DIFF(q + 8, buf) > len) {
 322                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 323                                         return;
 324                                 }
 325
 326                                 ntversion = IVAL(q, 0);
 327                                 lmnttoken = SVAL(q, 4);
 328                                 lm20token = SVAL(q, 6);
 329                                 q += 8;
 330
 331                                 DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 332
 333                                 /*
 334                                  * we respond regadless of whether the machine is in our password
 335                                  * database. If it isn't then we let smbd send an appropriate error.
 336                                  * Let's ignore the SID.
 337                                  */
 338                                 pull_ucs2_pstring(ascuser, uniuser);
 339                                 pull_ucs2_fstring(asccomp, unicomp);
 340                                 DEBUG(5,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 341
 342                                 fstrcpy(reply_name, "\\\\"); /* Here it wants \\LOGONSERVER. */
 343                                 fstrcat(reply_name, my_name);
 344
 345                                 DEBUG(5,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 346                                         asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
 347                                 SAMLOGON_R ,lmnttoken));
 348
 349                                 /* Construct reply. */
 350
 351                                 q = outbuf;
 352                                 /* we want the simple version unless we are an ADS PDC..which means  */
 353                                 /* never, at least for now */
 354                                 if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
 355                                         if (SVAL(uniuser, 0) == 0) {
 356                                                 SSVAL(q, 0, SAMLOGON_UNK_R);    /* user unknown */
 357                                         } else {
 358                                                 SSVAL(q, 0, SAMLOGON_R);
 359                                         }
 360
 361                                         q += 2;
 362
 363                                         q += dos_PutUniCode(q, reply_name,
 364                                                 sizeof(pstring) - PTR_DIFF(q, outbuf),
 365                                                 True);
 366                                         q += dos_PutUniCode(q, ascuser,
 367                                                 sizeof(pstring) - PTR_DIFF(q, outbuf),
 368                                                 True);
 369                                         q += dos_PutUniCode(q, lp_workgroup(),
 370                                                 sizeof(pstring) - PTR_DIFF(q, outbuf),
 371                                                 True);
 372                                 }
 373 #ifdef HAVE_ADS
 374                                 else {
 375                                         struct GUID domain_guid;
 376                                         UUID_FLAT flat_guid;
 377                                         pstring domain;
 378                                         pstring hostname;
 379                                         char *component, *dc, *q1;
 380                                         uint8 size;
 381                                         char *q_orig = q;
 382                                         int str_offset;
 383
 384                                         get_mydnsdomname(domain);
 385                                         get_myname(hostname);
 386
 387                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 8) {
 388                                                 return;
 389                                         }
 390                                         if (SVAL(uniuser, 0) == 0) {
 391                                                 SIVAL(q, 0, SAMLOGON_AD_UNK_R); /* user unknown */
 392                                         } else {
 393                                                 SIVAL(q, 0, SAMLOGON_AD_R);
 394                                         }
 395                                         q += 4;
 396
 397                                         SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
 398                                                 ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
 399                                         q += 4;
 400
 401                                         /* Push Domain GUID */
 402                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < UUID_FLAT_SIZE) {
 403                                                 return;
 404                                         }
 405                                         if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
 406                                                 DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
 407                                                 return;
 408                                         }
 409
 410                                         smb_uuid_pack(domain_guid, &flat_guid);
 411                                         memcpy(q, &flat_guid.info, UUID_FLAT_SIZE);
 412                                         q += UUID_FLAT_SIZE;
 413
 414                                         /* Forest */
 415                                         str_offset = q - q_orig;
 416                                         dc = domain;
 417                                         q1 = q;
 418                                         while ((component = strtok(dc, "."))) {
 419                                                 dc = NULL;
 420                                                 if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 1) {
 421                                                         return;
 422                                                 }
 423                                                 size = push_ascii(&q[1], component,
 424                                                         sizeof(outbuf) - PTR_DIFF(q+1, outbuf),
 425                                                         0);
 426                                                 SCVAL(q, 0, size);
 427                                                 q += (size + 1);
 428                                         }
 429
 430                                         /* Unk0 */
 431                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 4) {
 432                                                 return;
 433                                         }
 434                                         SCVAL(q, 0, 0);
 435                                         q++;
 436
 437                                         /* Domain */
 438                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 439                                         SCVAL(q, 1, str_offset & 0xFF);
 440                                         q += 2;
 441
 442                                         /* Hostname */
 443                                         size = push_ascii(&q[1], hostname,
 444                                                         sizeof(outbuf) - PTR_DIFF(q+1, outbuf),
 445                                                         0);
 446                                         SCVAL(q, 0, size);
 447                                         q += (size + 1);
 448
 449                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 3) {
 450                                                 return;
 451                                         }
 452
 453                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 454                                         SCVAL(q, 1, str_offset & 0xFF);
 455                                         q += 2;
 456
 457                                         /* NETBIOS of domain */
 458                                         size = push_ascii(&q[1], lp_workgroup(),
 459                                                         sizeof(outbuf) - PTR_DIFF(q+1, outbuf),
 460                                                         STR_UPPER);
 461                                         SCVAL(q, 0, size);
 462                                         q += (size + 1);
 463
 464                                         /* Unk1 */
 465                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 2) {
 466                                                 return;
 467                                         }
 468
 469                                         SCVAL(q, 0, 0);
 470                                         q++;
 471
 472                                         /* NETBIOS of hostname */
 473                                         size = push_ascii(&q[1], my_name,
 474                                                         sizeof(outbuf) - PTR_DIFF(q+1, outbuf),
 475                                                         0);
 476                                         SCVAL(q, 0, size);
 477                                         q += (size + 1);
 478
 479                                         /* Unk2 */
 480                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 4) {
 481                                                 return;
 482                                         }
 483
 484                                         SCVAL(q, 0, 0);
 485                                         q++;
 486
 487                                         /* User name */
 488                                         if (SVAL(uniuser, 0) != 0) {
 489                                                 size = push_ascii(&q[1], ascuser,
 490                                                         sizeof(outbuf) - PTR_DIFF(q+1, outbuf),
 491                                                         0);
 492                                                 SCVAL(q, 0, size);
 493                                                 q += (size + 1);
 494                                         }
 495
 496                                         q_orig = q;
 497                                         /* Site name */
 498                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 1) {
 499                                                 return;
 500                                         }
 501                                         size = push_ascii(&q[1], "Default-First-Site-Name",
 502                                                         sizeof(outbuf) - PTR_DIFF(q+1, outbuf),
 503                                                         0);
 504                                         SCVAL(q, 0, size);
 505                                         q += (size + 1);
 506
 507                                         if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 18) {
 508                                                 return;
 509                                         }
 510
 511                                         /* Site name (2) */
 512                                         str_offset = q - q_orig;
 513                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 514                                         SCVAL(q, 1, str_offset & 0xFF);
 515                                         q += 2;
 516
 517                                         SCVAL(q, 0, PTR_DIFF(q,q1));
 518                                         SCVAL(q, 1, 0x10); /* unknown */
 519
 520                                         SIVAL(q, 0, 0x00000002);
 521                                         q += 4; /* unknown */
 522                                         SIVAL(q, 0, (iface_ip(p->ip))->s_addr);
 523                                         q += 4;
 524                                         SIVAL(q, 0, 0x00000000);
 525                                         q += 4; /* unknown */
 526                                         SIVAL(q, 0, 0x00000000);
 527                                         q += 4; /* unknown */
 528                                 }
 529 #endif
 530
 531                                 if (sizeof(outbuf) - PTR_DIFF(q, outbuf) < 8) {
 532                                         return;
 533                                 }
 534
 535                                 /* tell the client what version we are */
 536                                 SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13);
 537                                 /* our ntversion */
 538                                 SSVAL(q, 4, 0xffff); /* our lmnttoken */
 539                                 SSVAL(q, 6, 0xffff); /* our lm20token */
 540                                 q += 8;
 541
 542                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 543
 544                                 pull_ascii_fstring(getdc_str, getdc);
 545                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 546
 547                                 send_mailslot(True, getdc,
 548                                         outbuf,PTR_DIFF(q,outbuf),
 549                                         global_myname(), 0x0,
 550                                         source_name,
 551                                         dgram->source_name.name_type,
 552                                         p->ip, *iface_ip(p->ip), p->port);
 553                                 break;
 554                         }
 555
 556                 /* Announce change to UAS or SAM.  Send by the domain controller when a
 557                 replication event is required. */
 558
 559                 case SAM_UAS_CHANGE:
 560                         DEBUG(5, ("Got SAM_UAS_CHANGE\n"));
 561                         break;
 562
 563                 default:
 564                         DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 565                         return;
 566         }
 567 }