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 1994-2003
   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, 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 Process a domain logon packet
  37 **************************************************************************/
  38
  39 void process_logon_packet(struct packet_struct *p, char *buf,int len,
  40                           const char *mailslot)
  41 {
  42         struct dgram_packet *dgram = &p->packet.dgram;
  43         pstring my_name;
  44         fstring reply_name;
  45         pstring outbuf;
  46         int code;
  47         uint16 token = 0;
  48         uint32 ntversion = 0;
  49         uint16 lmnttoken = 0;
  50         uint16 lm20token = 0;
  51         uint32 domainsidsize;
  52         BOOL short_request = False;
  53         char *getdc;
  54         char *uniuser; /* Unicode user name. */
  55         pstring ascuser;
  56         char *unicomp; /* Unicode computer name. */
  57
  58         memset(outbuf, 0, sizeof(outbuf));
  59
  60         if (!lp_domain_logons()) {
  61                 DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
  62 logons are not enabled.\n", inet_ntoa(p->ip) ));
  63                 return;
  64         }
  65
  66         pstrcpy(my_name, global_myname());
  67
  68         code = get_safe_SVAL(buf,len,buf,0,-1);
  69         DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
  70
  71         switch (code) {
  72                 case 0:
  73                         {
  74                                 fstring mach_str, user_str, getdc_str;
  75                                 char *q = buf + 2;
  76                                 char *machine = q;
  77                                 char *user = skip_string(buf,len,machine);
  78
  79                                 if (!user || PTR_DIFF(user, buf) >= len) {
  80                                         DEBUG(0,("process_logon_packet: bad packet\n"));
  81                                         return;
  82                                 }
  83                                 getdc = skip_string(buf,len,user);
  84
  85                                 if (!getdc || PTR_DIFF(getdc, buf) >= len) {
  86                                         DEBUG(0,("process_logon_packet: bad packet\n"));
  87                                         return;
  88                                 }
  89                                 q = skip_string(buf,len,getdc);
  90
  91                                 if (!q || PTR_DIFF(q + 5, buf) > len) {
  92                                         DEBUG(0,("process_logon_packet: bad packet\n"));
  93                                         return;
  94                                 }
  95                                 token = SVAL(q,3);
  96
  97                                 fstrcpy(reply_name,my_name);
  98
  99                                 pull_ascii_fstring(mach_str, machine);
 100                                 pull_ascii_fstring(user_str, user);
 101                                 pull_ascii_fstring(getdc_str, getdc);
 102
 103                                 DEBUG(5,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
 104                                         mach_str,inet_ntoa(p->ip),user_str,token));
 105
 106                                 q = outbuf;
 107                                 SSVAL(q, 0, 6);
 108                                 q += 2;
 109
 110                                 fstrcpy(reply_name, "\\\\");
 111                                 fstrcat(reply_name, my_name);
 112                                 push_ascii_fstring(q, reply_name);
 113                                 q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
 114
 115                                 SSVAL(q, 0, token);
 116                                 q += 2;
 117
 118                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 119
 120                                 send_mailslot(True, getdc_str,
 121                                                 outbuf,PTR_DIFF(q,outbuf),
 122                                                 global_myname(), 0x0,
 123                                                 mach_str,
 124                                                 dgram->source_name.name_type,
 125                                                 p->ip, *iface_ip(p->ip), p->port);
 126                                 break;
 127                         }
 128
 129                 case QUERYFORPDC:
 130                         {
 131                                 fstring mach_str, getdc_str;
 132                                 fstring source_name;
 133                                 char *q = buf + 2;
 134                                 char *machine = q;
 135
 136                                 if (!lp_domain_master()) {
 137                                         /* We're not Primary Domain Controller -- ignore this */
 138                                         return;
 139                                 }
 140
 141                                 getdc = skip_string(buf,len,machine);
 142
 143                                 if (!getdc || PTR_DIFF(getdc, buf) >= len) {
 144                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 145                                         return;
 146                                 }
 147                                 q = skip_string(buf,len,getdc);
 148
 149                                 if (!q || PTR_DIFF(q, buf) >= len) {
 150                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 151                                         return;
 152                                 }
 153                                 q = ALIGN2(q, buf);
 154
 155                                 /* At this point we can work out if this is a W9X or NT style
 156                                    request. Experiments show that the difference is wether the
 157                                    packet ends here. For a W9X request we now end with a pair of
 158                                    bytes (usually 0xFE 0xFF) whereas with NT we have two further
 159                                    strings - the following is a simple way of detecting this */
 160
 161                                 if (len - PTR_DIFF(q, buf) <= 3) {
 162                                         short_request = True;
 163                                 } else {
 164                                         unicomp = q;
 165
 166                                         if (PTR_DIFF(q, buf) >= len) {
 167                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 168                                                 return;
 169                                         }
 170
 171                                         /* A full length (NT style) request */
 172                                         q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 173
 174                                         if (PTR_DIFF(q, buf) >= len) {
 175                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 176                                                 return;
 177                                         }
 178
 179                                         if (len - PTR_DIFF(q, buf) > 8) {
 180                                                 /* with NT5 clients we can sometimes
 181                                                         get additional data - a length specificed string
 182                                                         containing the domain name, then 16 bytes of
 183                                                         data (no idea what it is) */
 184                                                 int dom_len = CVAL(q, 0);
 185                                                 q++;
 186                                                 if (dom_len != 0) {
 187                                                         q += dom_len + 1;
 188                                                 }
 189                                                 q += 16;
 190                                         }
 191
 192                                         if (PTR_DIFF(q + 8, buf) > len) {
 193                                                 DEBUG(0,("process_logon_packet: bad packet\n"));
 194                                                 return;
 195                                         }
 196
 197                                         ntversion = IVAL(q, 0);
 198                                         lmnttoken = SVAL(q, 4);
 199                                         lm20token = SVAL(q, 6);
 200                                 }
 201
 202                                 /* Construct reply. */
 203                                 q = outbuf;
 204                                 SSVAL(q, 0, QUERYFORPDC_R);
 205                                 q += 2;
 206
 207                                 fstrcpy(reply_name,my_name);
 208                                 push_ascii_fstring(q, reply_name);
 209                                 q = skip_string(outbuf,sizeof(outbuf),q); /* PDC name */
 210
 211                                 /* PDC and domain name */
 212                                 if (!short_request) {
 213                                         /* Make a full reply */
 214                                         q = ALIGN2(q, outbuf);
 215
 216                                         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 217                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True); /* Domain name*/
 218                                         SIVAL(q, 0, 1); /* our nt version */
 219                                         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 220                                         SSVAL(q, 6, 0xffff); /* our lm20token */
 221                                         q += 8;
 222                                 }
 223
 224                                 /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 225
 226                                 pull_ascii_fstring(mach_str, machine);
 227
 228                                 DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, \
 229 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 230                                         mach_str,inet_ntoa(p->ip), reply_name, lp_workgroup(),
 231                                         QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 232                                         (uint32)lm20token ));
 233
 234                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 235
 236                                 pull_ascii_fstring(getdc_str, getdc);
 237                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 238
 239                                 send_mailslot(True, getdc_str,
 240                                         outbuf,PTR_DIFF(q,outbuf),
 241                                         global_myname(), 0x0,
 242                                         source_name,
 243                                         dgram->source_name.name_type,
 244                                         p->ip, *iface_ip(p->ip), p->port);
 245                                 return;
 246                         }
 247
 248                 case SAMLOGON:
 249
 250                         {
 251                                 fstring getdc_str;
 252                                 fstring source_name;
 253                                 char *q = buf + 2;
 254                                 fstring asccomp;
 255
 256                                 q += 2;
 257
 258                                 if (PTR_DIFF(q, buf) >= len) {
 259                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 260                                         return;
 261                                 }
 262
 263                                 unicomp = q;
 264                                 uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 265
 266                                 if (PTR_DIFF(uniuser, buf) >= len) {
 267                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 268                                         return;
 269                                 }
 270
 271                                 getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 272
 273                                 if (PTR_DIFF(getdc, buf) >= len) {
 274                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 275                                         return;
 276                                 }
 277
 278                                 q = skip_string(buf,len,getdc);
 279
 280                                 if (!q || PTR_DIFF(q + 8, buf) >= len) {
 281                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 282                                         return;
 283                                 }
 284
 285                                 q += 4; /* Account Control Bits - indicating username type */
 286                                 domainsidsize = IVAL(q, 0);
 287                                 q += 4;
 288
 289                                 DEBUG(5,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 290
 291                                 if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 292                                         q += domainsidsize;
 293                                         q = ALIGN4(q, buf);
 294                                 }
 295
 296                                 DEBUG(5,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %ld\n", len, (unsigned long)PTR_DIFF(q, buf) ));
 297
 298                                 if (len - PTR_DIFF(q, buf) > 8) {
 299                                         /* with NT5 clients we can sometimes
 300                                                 get additional data - a length specificed string
 301                                                 containing the domain name, then 16 bytes of
 302                                                 data (no idea what it is) */
 303                                         int dom_len = CVAL(q, 0);
 304                                         q++;
 305                                         if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 306                                                 q += dom_len + 1;
 307                                         }
 308                                         q += 16;
 309                                 }
 310
 311                                 if (PTR_DIFF(q + 8, buf) > len) {
 312                                         DEBUG(0,("process_logon_packet: bad packet\n"));
 313                                         return;
 314                                 }
 315
 316                                 ntversion = IVAL(q, 0);
 317                                 lmnttoken = SVAL(q, 4);
 318                                 lm20token = SVAL(q, 6);
 319                                 q += 8;
 320
 321                                 DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 322
 323                                 /*
 324                                  * we respond regadless of whether the machine is in our password
 325                                  * database. If it isn't then we let smbd send an appropriate error.
 326                                  * Let's ignore the SID.
 327                                  */
 328                                 pull_ucs2_pstring(ascuser, uniuser);
 329                                 pull_ucs2_fstring(asccomp, unicomp);
 330                                 DEBUG(5,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 331
 332                                 fstrcpy(reply_name, "\\\\"); /* Here it wants \\LOGONSERVER. */
 333                                 fstrcat(reply_name, my_name);
 334
 335                                 DEBUG(5,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 336                                         asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
 337                                 SAMLOGON_R ,lmnttoken));
 338
 339                                 /* Construct reply. */
 340
 341                                 q = outbuf;
 342                                 /* we want the simple version unless we are an ADS PDC..which means  */
 343                                 /* never, at least for now */
 344                                 if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
 345                                         if (SVAL(uniuser, 0) == 0) {
 346                                                 SSVAL(q, 0, SAMLOGON_UNK_R);    /* user unknown */
 347                                         } else {
 348                                                 SSVAL(q, 0, SAMLOGON_R);
 349                                         }
 350
 351                                         q += 2;
 352
 353                                         q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
 354                                         q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
 355                                         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True);
 356                                 }
 357 #ifdef HAVE_ADS
 358                                 else {
 359                                         struct GUID domain_guid;
 360                                         UUID_FLAT flat_guid;
 361                                         pstring domain;
 362                                         pstring hostname;
 363                                         char *component, *dc, *q1;
 364                                         uint8 size;
 365                                         char *q_orig = q;
 366                                         int str_offset;
 367
 368                                         get_mydnsdomname(domain);
 369                                         get_myname(hostname);
 370
 371                                         if (SVAL(uniuser, 0) == 0) {
 372                                                 SIVAL(q, 0, SAMLOGON_AD_UNK_R); /* user unknown */
 373                                         } else {
 374                                                 SIVAL(q, 0, SAMLOGON_AD_R);
 375                                         }
 376                                         q += 4;
 377
 378                                         SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
 379                                                 ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
 380                                         q += 4;
 381
 382                                         /* Push Domain GUID */
 383                                         if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
 384                                                 DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
 385                                                 return;
 386                                         }
 387
 388                                         smb_uuid_pack(domain_guid, &flat_guid);
 389                                         memcpy(q, &flat_guid.info, UUID_FLAT_SIZE);
 390                                         q += UUID_FLAT_SIZE;
 391
 392                                         /* Forest */
 393                                         str_offset = q - q_orig;
 394                                         dc = domain;
 395                                         q1 = q;
 396                                         while ((component = strtok(dc, "."))) {
 397                                                 dc = NULL;
 398                                                 size = push_ascii(&q[1], component, -1, 0);
 399                                                 SCVAL(q, 0, size);
 400                                                 q += (size + 1);
 401                                         }
 402
 403                                         /* Unk0 */
 404                                         SCVAL(q, 0, 0);
 405                                         q++;
 406
 407                                         /* Domain */
 408                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 409                                         SCVAL(q, 1, str_offset & 0xFF);
 410                                         q += 2;
 411
 412                                         /* Hostname */
 413                                         size = push_ascii(&q[1], hostname, -1, 0);
 414                                         SCVAL(q, 0, size);
 415                                         q += (size + 1);
 416                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 417                                         SCVAL(q, 1, str_offset & 0xFF);
 418                                         q += 2;
 419
 420                                         /* NETBIOS of domain */
 421                                         size = push_ascii(&q[1], lp_workgroup(), -1, STR_UPPER);
 422                                         SCVAL(q, 0, size);
 423                                         q += (size + 1);
 424
 425                                         /* Unk1 */
 426                                         SCVAL(q, 0, 0);
 427                                         q++;
 428
 429                                         /* NETBIOS of hostname */
 430                                         size = push_ascii(&q[1], my_name, -1, 0);
 431                                         SCVAL(q, 0, size);
 432                                         q += (size + 1);
 433
 434                                         /* Unk2 */
 435                                         SCVAL(q, 0, 0);
 436                                         q++;
 437
 438                                         /* User name */
 439                                         if (SVAL(uniuser, 0) != 0) {
 440                                                 size = push_ascii(&q[1], ascuser, -1, 0);
 441                                                 SCVAL(q, 0, size);
 442                                                 q += (size + 1);
 443                                         }
 444
 445                                         q_orig = q;
 446                                         /* Site name */
 447                                         size = push_ascii(&q[1], "Default-First-Site-Name", -1, 0);
 448                                         SCVAL(q, 0, size);
 449                                         q += (size + 1);
 450
 451                                         /* Site name (2) */
 452                                         str_offset = q - q_orig;
 453                                         SCVAL(q, 0, 0xc0 | ((str_offset >> 8) & 0x3F));
 454                                         SCVAL(q, 1, str_offset & 0xFF);
 455                                         q += 2;
 456
 457                                         SCVAL(q, 0, PTR_DIFF(q,q1));
 458                                         SCVAL(q, 1, 0x10); /* unknown */
 459
 460                                         SIVAL(q, 0, 0x00000002);
 461                                         q += 4; /* unknown */
 462                                         SIVAL(q, 0, (iface_ip(p->ip))->s_addr);
 463                                         q += 4;
 464                                         SIVAL(q, 0, 0x00000000);
 465                                         q += 4; /* unknown */
 466                                         SIVAL(q, 0, 0x00000000);
 467                                         q += 4; /* unknown */
 468                                 }
 469 #endif
 470
 471                                 /* tell the client what version we are */
 472                                 SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13);
 473                                 /* our ntversion */
 474                                 SSVAL(q, 4, 0xffff); /* our lmnttoken */
 475                                 SSVAL(q, 6, 0xffff); /* our lm20token */
 476                                 q += 8;
 477
 478                                 dump_data(4, (uint8 *)outbuf, PTR_DIFF(q, outbuf));
 479
 480                                 pull_ascii_fstring(getdc_str, getdc);
 481                                 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
 482
 483                                 send_mailslot(True, getdc,
 484                                         outbuf,PTR_DIFF(q,outbuf),
 485                                         global_myname(), 0x0,
 486                                         source_name,
 487                                         dgram->source_name.name_type,
 488                                         p->ip, *iface_ip(p->ip), p->port);
 489                                 break;
 490                         }
 491
 492                 /* Announce change to UAS or SAM.  Send by the domain controller when a
 493                 replication event is required. */
 494
 495                 case SAM_UAS_CHANGE:
 496                         DEBUG(5, ("Got SAM_UAS_CHANGE\n"));
 497                         break;
 498
 499                 default:
 500                         DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 501                         return;
 502         }
 503 }