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_fstring(q, reply_name);
 112                                 q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
 113
 114                                 SSVAL(q, 0, token);
 115                                 q += 2;
 116
 117                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 118
 119                                 send_mailslot(True, getdc_str,
 120                                                 outbuf,PTR_DIFF(q,outbuf),
 121                                                 global_myname(), 0x0,
 122                                                 mach_str,
 123                                                 dgram->source_name.name_type,
 124                                                 p->ip, *iface_ip(p->ip), p->port);
 125                                 break;
 126                         }
 127
 128                 case QUERYFORPDC:
 129                         {
 130                                 fstring mach_str, getdc_str;
 131                                 fstring source_name;
 132                                 char *q = buf + 2;
 133                                 char *machine = q;
 134
 135                                 if (!lp_domain_master()) {
 136                                         /* We're not Primary Domain Controller -- ignore this */
 137                                         return;
 138                                 }
 139
 140                                 getdc = skip_string(buf,len,machine);
 141
 142                                 if (!getdc || PTR_DIFF(getdc, buf) >= len) {
 143                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 144                                         return;
 145                                 }
 146                                 q = skip_string(buf,len,getdc);
 147
 148                                 if (!q || PTR_DIFF(q, buf) >= len) {
 149                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 150                                         return;
 151                                 }
 152                                 q = ALIGN2(q, buf);
 153
 154                                 /* At this point we can work out if this is a W9X or NT style
 155                                    request. Experiments show that the difference is wether the
 156                                    packet ends here. For a W9X request we now end with a pair of
 157                                    bytes (usually 0xFE 0xFF) whereas with NT we have two further
 158                                    strings - the following is a simple way of detecting this */
 159
 160                                 if (len - PTR_DIFF(q, buf) <= 3) {
 161                                         short_request = True;
 162                                 } else {
 163                                         unicomp = q;
 164
 165                                         if (PTR_DIFF(q, buf) >= len) {
 166                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 167                                                 return;
 168                                         }
 169
 170                                         /* A full length (NT style) request */
 171                                         q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 172
 173                                         if (PTR_DIFF(q, buf) >= len) {
 174                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 175                                                 return;
 176                                         }
 177
 178                                         if (len - PTR_DIFF(q, buf) > 8) {
 179                                                 /* with NT5 clients we can sometimes
 180                                                         get additional data - a length specificed string
 181                                                         containing the domain name, then 16 bytes of
 182                                                         data (no idea what it is) */
 183                                                 int dom_len = CVAL(q, 0);
 184                                                 q++;
 185                                                 if (dom_len != 0) {
 186                                                         q += dom_len + 1;
 187                                                 }
 188                                                 q += 16;
 189                                         }
 190
 191                                         if (PTR_DIFF(q + 8, buf) > len) {
 192                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 193                                                 return;
 194                                         }
 195
 196                                         ntversion = IVAL(q, 0);
 197                                         lmnttoken = SVAL(q, 4);
 198                                         lm20token = SVAL(q, 6);
 199                                 }
 200
 201                                 /* Construct reply. */
 202                                 q = outbuf;
 203                                 SSVAL(q, 0, QUERYFORPDC_R);
 204                                 q += 2;
 205
 206                                 fstrcpy(reply_name,my_name);
 207                                 push_ascii_fstring(q, reply_name);
 208                                 q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
 209
 210                                 /* PDC and domain name */
 211                                 if (!short_request) {
 212                                         /* Make a full reply */
 213                                         q = ALIGN2(q, outbuf);
 214
 215                                         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 216                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True); /* Domain name*/
 217                                         SIVAL(q, 0, 1); /* our nt version */
 218                                         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 219                                         SSVAL(q, 6, 0xffff); /* our lm20token */
 220                                         q += 8;
 221                                 }
 222
 223                                 /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 224
 225                                 pull_ascii_fstring(mach_str, machine);
 226
 227                                 DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, \
 228 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 229                                         mach_str,inet_ntoa(p->ip), reply_name, lp_workgroup(),
 230                                         QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 231                                         (uint32)lm20token ));
 232
 233                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 234
 235                                 pull_ascii_fstring(getdc_str, getdc);
 236                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 237
 238                                 send_mailslot(True, getdc_str,
 239                                         outbuf,PTR_DIFF(q,outbuf),
 240                                         global_myname(), 0x0,
 241                                         source_name,
 242                                         dgram->source_name.name_type,
 243                                         p->ip, *iface_ip(p->ip), p->port);
 244                                 return;
 245                         }
 246
 247                 case SAMLOGON:
 248
 249                         {
 250                                 fstring getdc_str;
 251                                 fstring source_name;
 252                                 char *q = buf + 2;
 253                                 fstring asccomp;
 254
 255                                 q += 2;
 256
 257                                 if (PTR_DIFF(q, buf) >= len) {
 258                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 259                                         return;
 260                                 }
 261
 262                                 unicomp = q;
 263                                 uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 264
 265                                 if (PTR_DIFF(uniuser, buf) >= len) {
 266                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 267                                         return;
 268                                 }
 269
 270                                 getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 271
 272                                 if (PTR_DIFF(getdc, buf) >= len) {
 273                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 274                                         return;
 275                                 }
 276
 277                                 q = skip_string(buf,len,getdc);
 278
 279                                 if (!q || PTR_DIFF(q + 8, buf) >= len) {
 280                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 281                                         return;
 282                                 }
 283
 284                                 q += 4; /* Account Control Bits - indicating username type */
 285                                 domainsidsize = IVAL(q, 0);
 286                                 q += 4;
 287
 288                                 DEBUG(5,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 289
 290                                 if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 291                                         q += domainsidsize;
 292                                         q = ALIGN4(q, buf);
 293                                 }
 294
 295                                 DEBUG(5,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %ld\n", len, (unsigned long)PTR_DIFF(q, buf) ));
 296
 297                                 if (len - PTR_DIFF(q, buf) > 8) {
 298                                         /* with NT5 clients we can sometimes
 299                                                 get additional data - a length specificed string
 300                                                 containing the domain name, then 16 bytes of
 301                                                 data (no idea what it is) */
 302                                         int dom_len = CVAL(q, 0);
 303                                         q++;
 304                                         if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 305                                                 q += dom_len + 1;
 306                                         }
 307                                         q += 16;
 308                                 }
 309
 310                                 if (PTR_DIFF(q + 8, buf) > len) {
 311                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 312                                         return;
 313                                 }
 314
 315                                 ntversion = IVAL(q, 0);
 316                                 lmnttoken = SVAL(q, 4);
 317                                 lm20token = SVAL(q, 6);
 318                                 q += 8;
 319
 320                                 DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 321
 322                                 /*
 323                                  * we respond regadless of whether the machine is in our password
 324                                  * database. If it isn't then we let smbd send an appropriate error.
 325                                  * Let's ignore the SID.
 326                                  */
 327                                 pull_ucs2_pstring(ascuser, uniuser);
 328                                 pull_ucs2_fstring(asccomp, unicomp);
 329                                 DEBUG(5,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 330
 331                                 fstrcpy(reply_name, "\\\\"); /* Here it wants \\LOGONSERVER. */
 332                                 fstrcat(reply_name, my_name);
 333
 334                                 DEBUG(5,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 335                                         asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
 336                                 SAMLOGON_R ,lmnttoken));
 337
 338                                 /* Construct reply. */
 339
 340                                 q = outbuf;
 341                                 /* we want the simple version unless we are an ADS PDC..which means  */
 342                                 /* never, at least for now */
 343                                 if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
 344                                         if (SVAL(uniuser, 0) == 0) {
 345                                                 SSVAL(q, 0, SAMLOGON_UNK_R);    /* user unknown */
 346                                         } else {
 347                                                 SSVAL(q, 0, SAMLOGON_R);
 348                                         }
 349
 350                                         q += 2;
 351
 352                                         q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
 353                                         q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
 354                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True);
 355                                 }
 356 #ifdef HAVE_ADS
 357                                 else {
 358                                         struct GUID domain_guid;
 359                                         UUID_FLAT flat_guid;
 360                                         pstring domain;
 361                                         pstring hostname;
 362                                         char *component, *dc, *q1;
 363                                         uint8 size;
 364                                         char *q_orig = q;
 365                                         int str_offset;
 366
 367                                         get_mydnsdomname(domain);
 368                                         get_myname(hostname);
 369
 370                                         if (SVAL(uniuser, 0) == 0) {
 371                                                 SIVAL(q, 0, SAMLOGON_AD_UNK_R); /* user unknown */
 372                                         } else {
 373                                                 SIVAL(q, 0, SAMLOGON_AD_R);
 374                                         }
 375                                         q += 4;
 376
 377                                         SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
 378                                                 ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
 379                                         q += 4;
 380
 381                                         /* Push Domain GUID */
 382                                         if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
 383                                                 DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
 384                                                 return;
 385                                         }
 386
 387                                         smb_uuid_pack(domain_guid, &flat_guid);
 388                                         memcpy(q, &flat_guid.info, UUID_FLAT_SIZE);
 389                                         q += UUID_FLAT_SIZE;
 390
 391                                         /* Forest */
 392                                         str_offset = q - q_orig;
 393                                         dc = domain;
 394                                         q1 = q;
 395                                         while ((component = strtok(dc, "."))) {
 396                                                 dc = NULL;
 397                                                 size = push_ascii(&q[1], component, -1, 0);
 398                                                 SCVAL(q, 0, size);
 399                                                 q += (size + 1);
 400                                         }
 401
 402                                         /* Unk0 */
 403                                         SCVAL(q, 0, 0);
 404                                         q++;
 405
 406                                         /* Domain */
 407                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 408                                         SCVAL(q, 1, str_offset & 0xFF);
 409                                         q += 2;
 410
 411                                         /* Hostname */
 412                                         size = push_ascii(&q[1], hostname, -1, 0);
 413                                         SCVAL(q, 0, size);
 414                                         q += (size + 1);
 415                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 416                                         SCVAL(q, 1, str_offset & 0xFF);
 417                                         q += 2;
 418
 419                                         /* NETBIOS of domain */
 420                                         size = push_ascii(&q[1], lp_workgroup(), -1, STR_UPPER);
 421                                         SCVAL(q, 0, size);
 422                                         q += (size + 1);
 423
 424                                         /* Unk1 */
 425                                         SCVAL(q, 0, 0);
 426                                         q++;
 427
 428                                         /* NETBIOS of hostname */
 429                                         size = push_ascii(&q[1], my_name, -1, 0);
 430                                         SCVAL(q, 0, size);
 431                                         q += (size + 1);
 432
 433                                         /* Unk2 */
 434                                         SCVAL(q, 0, 0);
 435                                         q++;
 436
 437                                         /* User name */
 438                                         if (SVAL(uniuser, 0) != 0) {
 439                                                 size = push_ascii(&q[1], ascuser, -1, 0);
 440                                                 SCVAL(q, 0, size);
 441                                                 q += (size + 1);
 442                                         }
 443
 444                                         q_orig = q;
 445                                         /* Site name */
 446                                         size = push_ascii(&q[1], "Default-First-Site-Name", -1, 0);
 447                                         SCVAL(q, 0, size);
 448                                         q += (size + 1);
 449
 450                                         /* Site name (2) */
 451                                         str_offset = q - q_orig;
 452                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 453                                         SCVAL(q, 1, str_offset & 0xFF);
 454                                         q += 2;
 455
 456                                         SCVAL(q, 0, PTR_DIFF(q,q1));
 457                                         SCVAL(q, 1, 0x10); /* unknown */
 458
 459                                         SIVAL(q, 0, 0x00000002);
 460                                         q += 4; /* unknown */
 461                                         SIVAL(q, 0, (iface_ip(p->ip))->s_addr);
 462                                         q += 4;
 463                                         SIVAL(q, 0, 0x00000000);
 464                                         q += 4; /* unknown */
 465                                         SIVAL(q, 0, 0x00000000);
 466                                         q += 4; /* unknown */
 467                                 }
 468 #endif
 469
 470                                 /* tell the client what version we are */
 471                                 SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13);
 472                                 /* our ntversion */
 473                                 SSVAL(q, 4, 0xffff); /* our lmnttoken */
 474                                 SSVAL(q, 6, 0xffff); /* our lm20token */
 475                                 q += 8;
 476
 477                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 478
 479                                 pull_ascii_fstring(getdc_str, getdc);
 480                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 481
 482                                 send_mailslot(True, getdc,
 483                                         outbuf,PTR_DIFF(q,outbuf),
 484                                         global_myname(), 0x0,
 485                                         source_name,
 486                                         dgram->source_name.name_type,
 487                                         p->ip, *iface_ip(p->ip), p->port);
 488                                 break;
 489                         }
 490
 491                 /* Announce change to UAS or SAM.  Send by the domain controller when a
 492                 replication event is required. */
 493
 494                 case SAM_UAS_CHANGE:
 495                         DEBUG(5, ("Got SAM_UAS_CHANGE\n"));
 496                         break;
 497
 498                 default:
 499                         DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 500                         return;
 501         }
 502 }