source/nmbd/nmbd_processlogon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-1998
   7    Copyright (C) Jim McDonough 2002
   8    Copyright (C) Anthony Liguori 2002
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24    Revision History:
  25
  26 */
  27
  28 #include "includes.h"
  29
  30 struct sam_database_info {
  31         uint32 index;
  32         uint32 serial_lo, serial_hi;
  33         uint32 date_lo, date_hi;
  34 };
  35
  36 /****************************************************************************
  37 Send a message to smbd to do a sam delta sync
  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                           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   {
  88     DEBUG(3,("process_logon_packet: Logon packet received from IP %s and domain \
  89 logons are not enabled.\n", inet_ntoa(p->ip) ));
  90     return;
  91   }
  92
  93   pstrcpy(my_name, global_myname());
  94
  95   code = SVAL(buf,0);
  96   DEBUG(1,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
  97
  98   switch (code)
  99   {
 100     case 0:
 101     {
 102       char *q = buf + 2;
 103       char *machine = q;
 104       char *user = skip_string(machine,1);
 105
 106       getdc = skip_string(user,1);
 107       q = skip_string(getdc,1);
 108       token = SVAL(q,3);
 109
 110       fstrcpy(reply_name,my_name);
 111
 112       DEBUG(3,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
 113              machine,inet_ntoa(p->ip),user,token));
 114
 115       q = outbuf;
 116       SSVAL(q, 0, 6);
 117       q += 2;
 118
 119       fstrcpy(reply_name, "\\\\");
 120       fstrcat(reply_name, my_name);
 121       fstrcpy(q, reply_name); q = skip_string(q, 1); /* PDC name */
 122
 123       SSVAL(q, 0, token);
 124       q += 2;
 125
 126       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 127
 128       send_mailslot(True, getdc,
 129                     outbuf,PTR_DIFF(q,outbuf),
 130                     global_myname(), 0x0,
 131                                         machine,
 132                     dgram->source_name.name_type,
 133                     p->ip, *iface_ip(p->ip), p->port);
 134       break;
 135     }
 136
 137     case QUERYFORPDC:
 138     {
 139       char *q = buf + 2;
 140       char *machine = q;
 141
 142       if (!lp_domain_master())
 143       {
 144          /* We're not Primary Domain Controller -- ignore this */
 145          return;
 146       }
 147
 148       getdc = skip_string(machine,1);
 149       q = skip_string(getdc,1);
 150       q = ALIGN2(q, buf);
 151
 152       /* at this point we can work out if this is a W9X or NT style
 153          request. Experiments show that the difference is wether the
 154          packet ends here. For a W9X request we now end with a pair of
 155          bytes (usually 0xFE 0xFF) whereas with NT we have two further
 156          strings - the following is a simple way of detecting this */
 157       if (len - PTR_DIFF(q, buf) <= 3) {
 158               short_request = True;
 159       } else {
 160               unicomp = q;
 161
 162               /* A full length (NT style) request */
 163               q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 164
 165               if (len - PTR_DIFF(q, buf) > 8) {
 166                                         /* with NT5 clients we can sometimes
 167                                            get additional data - a length specificed string
 168                                            containing the domain name, then 16 bytes of
 169                                            data (no idea what it is) */
 170                                         int dom_len = CVAL(q, 0);
 171                                         q++;
 172                                         if (dom_len != 0) {
 173                                                 q += dom_len + 1;
 174                                         }
 175                                         q += 16;
 176               }
 177               ntversion = IVAL(q, 0);
 178               lmnttoken = SVAL(q, 4);
 179               lm20token = SVAL(q, 6);
 180       }
 181
 182       /* Construct reply. */
 183       q = outbuf;
 184       SSVAL(q, 0, QUERYFORPDC_R);
 185       q += 2;
 186
 187       fstrcpy(reply_name,my_name);
 188       fstrcpy(q, reply_name);
 189       q = skip_string(q, 1); /* PDC name */
 190
 191       /* PDC and domain name */
 192       if (!short_request)  /* Make a full reply */
 193       {
 194         q = ALIGN2(q, outbuf);
 195
 196         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 197         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True); /* Domain name*/
 198         SIVAL(q, 0, 1); /* our nt version */
 199         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 200         SSVAL(q, 6, 0xffff); /* our lm20token */
 201         q += 8;
 202       }
 203
 204       /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 205
 206       DEBUG(3,("process_logon_packet: GETDC request from %s at IP %s, \
 207 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 208             machine,inet_ntoa(p->ip), reply_name, lp_workgroup(),
 209             QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 210             (uint32)lm20token ));
 211
 212       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 213
 214       send_mailslot(True, getdc,
 215                   outbuf,PTR_DIFF(q,outbuf),
 216                     global_myname(), 0x0,
 217                   dgram->source_name.name,
 218                   dgram->source_name.name_type,
 219                   p->ip, *iface_ip(p->ip), p->port);
 220       return;
 221     }
 222
 223     case SAMLOGON:
 224     {
 225       char *q = buf + 2;
 226       fstring asccomp;
 227
 228       q += 2;
 229       unicomp = q;
 230       uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 231       getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 232       q = skip_string(getdc,1);
 233       q += 4; /* Account Control Bits - indicating username type */
 234       domainsidsize = IVAL(q, 0);
 235       q += 4;
 236
 237       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 238
 239       if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 240               q += domainsidsize;
 241               q = ALIGN4(q, buf);
 242       }
 243
 244       DEBUG(3,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %d\n", len, PTR_DIFF(q, buf) ));
 245
 246       if (len - PTR_DIFF(q, buf) > 8) {
 247               /* with NT5 clients we can sometimes
 248                  get additional data - a length specificed string
 249                  containing the domain name, then 16 bytes of
 250                  data (no idea what it is) */
 251               int dom_len = CVAL(q, 0);
 252               q++;
 253               if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 254                       q += dom_len + 1;
 255               }
 256               q += 16;
 257       }
 258
 259       ntversion = IVAL(q, 0);
 260       lmnttoken = SVAL(q, 4);
 261       lm20token = SVAL(q, 6);
 262       q += 8;
 263
 264       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 265
 266       /*
 267        * we respond regadless of whether the machine is in our password
 268        * database. If it isn't then we let smbd send an appropriate error.
 269        * Let's ignore the SID.
 270        */
 271       pull_ucs2_pstring(ascuser, uniuser);
 272       pull_ucs2_fstring(asccomp, unicomp);
 273       DEBUG(3,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 274
 275       fstrcpy(reply_name,"\\\\"); /* Here it wants \\LOGONSERVER. */
 276       fstrcpy(reply_name+2,my_name);
 277
 278       DEBUG(3,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 279                asccomp,inet_ntoa(p->ip), ascuser, reply_name, lp_workgroup(),
 280                SAMLOGON_R ,lmnttoken));
 281
 282       /* Construct reply. */
 283
 284       q = outbuf;
 285       /* we want the simple version unless we are an ADS PDC..which means  */
 286       /* never, at least for now */
 287       if ((ntversion < 11) || (SEC_ADS != lp_security()) || (ROLE_DOMAIN_PDC != lp_server_role())) {
 288         if (SVAL(uniuser, 0) == 0) {
 289           SSVAL(q, 0, SAMLOGON_UNK_R);  /* user unknown */
 290         } else {
 291           SSVAL(q, 0, SAMLOGON_R);
 292         }
 293
 294         q += 2;
 295
 296         q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
 297         q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
 298         q += dos_PutUniCode(q, lp_workgroup(),sizeof(pstring), True);
 299       }
 300 #ifdef HAVE_ADS
 301       else {
 302         GUID domain_guid;
 303         pstring domain;
 304         pstring hostname;
 305         char *component, *dc, *q1;
 306         uint8 size;
 307
 308         get_mydomname(domain);
 309         get_myname(hostname);
 310
 311         if (SVAL(uniuser, 0) == 0) {
 312           SSVAL(q, 0, SAMLOGON_AD_UNK_R);       /* user unknown */
 313         } else {
 314           SSVAL(q, 0, SAMLOGON_AD_R);
 315         }
 316         q += 2;
 317
 318         SSVAL(q, 0, 0);
 319         q += 2;
 320         SIVAL(q, 0, ADS_PDC|ADS_GC|ADS_LDAP|ADS_DS|
 321                     ADS_KDC|ADS_TIMESERV|ADS_CLOSEST|ADS_WRITABLE);
 322         q += 4;
 323
 324         /* Push Domain GUID */
 325         if (False == secrets_fetch_domain_guid(domain, &domain_guid)) {
 326           DEBUG(2, ("Could not fetch DomainGUID for %s\n", domain));
 327           return;
 328         }
 329         memcpy(q, &domain_guid, sizeof(domain_guid));
 330         q += sizeof(domain_guid);
 331
 332         /* Push domain components */
 333         dc = domain;
 334         q1 = q;
 335         while ((component = strtok(dc, "."))) {
 336           dc = NULL;
 337           size = push_ascii(&q[1], component, -1, 0);
 338           SCVAL(q, 0, size);
 339           q += (size + 1);
 340         }
 341         SCVAL(q, 0, 0); q++;
 342         SSVAL(q, 0, 0x18c0); /* not sure what this is for, but  */
 343         q += 2;              /* it must follow the domain name. */
 344
 345         /* Push dns host name */
 346         size = push_ascii(&q[1], hostname, -1, 0);
 347         SCVAL(q, 0, size);
 348         q += (size + 1);
 349         SSVAL(q, 0, 0x18c0); /* not sure what this is for, but  */
 350         q += 2;              /* it must follow the domain name. */
 351
 352         /* Push NETBIOS of domain */
 353         size = push_ascii(&q[1], lp_workgroup(), -1, STR_UPPER);
 354         SCVAL(q, 0, size);
 355         q += (size + 1);
 356         SCVAL(q, 0, 0); q++; /* is this a null terminator or empty field */
 357         /* null terminator would not be needed because size is included */
 358
 359         /* Push NETBIOS of hostname */
 360         size = push_ascii(&q[1], my_name, -1, 0);
 361         SCVAL(q, 0, size);
 362         q += (size + 1);
 363         SCVAL(q, 0, 0); q++; /* null terminator or empty field? */
 364
 365         /* Push user account */
 366         size = push_ascii(&q[1], ascuser, -1, 0);
 367         SCVAL(q, 0, size);
 368         q += (size + 1);
 369
 370         /* Push 'Default-First-Site-Name' */
 371         size = push_ascii(&q[1], "Default-First-Site-Name", -1, 0);
 372         SCVAL(q, 0, size);
 373         q += (size + 1);
 374
 375         SSVAL(q, 0, 0xc000); /* unknown */
 376         SCVAL(q, 2, PTR_DIFF(q,q1));
 377         SCVAL(q, 3, 0x10); /* unknown */
 378         q += 4;
 379
 380         SIVAL(q, 0, 0x00000002); q += 4; /* unknown */
 381         SIVAL(q, 0, (iface_ip(p->ip))->s_addr); q += 4;
 382         SIVAL(q, 0, 0x00000000); q += 4; /* unknown */
 383         SIVAL(q, 0, 0x00000000); q += 4; /* unknown */
 384       }
 385 #endif
 386
 387       /* tell the client what version we are */
 388       SIVAL(q, 0, ((ntversion < 11) || (SEC_ADS != lp_security())) ? 1 : 13);
 389       /* our ntversion */
 390       SSVAL(q, 4, 0xffff); /* our lmnttoken */
 391       SSVAL(q, 6, 0xffff); /* our lm20token */
 392       q += 8;
 393
 394       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 395
 396       send_mailslot(True, getdc,
 397                    outbuf,PTR_DIFF(q,outbuf),
 398                     global_myname(), 0x0,
 399                    dgram->source_name.name,
 400                    dgram->source_name.name_type,
 401                    p->ip, *iface_ip(p->ip), p->port);
 402       break;
 403     }
 404
 405     /* Announce change to UAS or SAM.  Send by the domain controller when a
 406        replication event is required. */
 407
 408   case SAM_UAS_CHANGE: {
 409           struct sam_database_info *db_info;
 410           char *q = buf + 2;
 411           int i, db_count;
 412           uint32 low_serial;
 413
 414           /* Header */
 415
 416           low_serial = IVAL(q, 0); q += 4;     /* Low serial number */
 417
 418           q += 4;                   /* Date/time */
 419           q += 4;                   /* Pulse */
 420           q += 4;                   /* Random */
 421
 422           /* Domain info */
 423
 424           q = skip_string(q, 1);    /* PDC name */
 425           q = skip_string(q, 1);    /* Domain name */
 426           q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode PDC name */
 427           q = skip_unibuf(q, PTR_DIFF(buf + len, q)); /* Unicode domain name */
 428
 429           /* Database info */
 430
 431           db_count = SVAL(q, 0); q += 2;
 432
 433           db_info = (struct sam_database_info *)
 434                   malloc(sizeof(struct sam_database_info) * db_count);
 435
 436           if (db_info == NULL) {
 437                   DEBUG(3, ("out of memory allocating info for %d databases\n",
 438                             db_count));
 439                   return;
 440           }
 441
 442           for (i = 0; i < db_count; i++) {
 443                   db_info[i].index = IVAL(q, 0);
 444                   db_info[i].serial_lo = IVAL(q, 4);
 445                   db_info[i].serial_hi = IVAL(q, 8);
 446                   db_info[i].date_lo = IVAL(q, 12);
 447                   db_info[i].date_hi = IVAL(q, 16);
 448                   q += 20;
 449           }
 450
 451           /* Domain SID */
 452
 453           q += IVAL(q, 0) + 4;  /* 4 byte length plus data */
 454
 455           q += 2;               /* Alignment? */
 456
 457           /* Misc other info */
 458
 459           q += 4;               /* NT version (0x1) */
 460           q += 2;               /* LMNT token (0xff) */
 461           q += 2;               /* LM20 token (0xff) */
 462
 463           SAFE_FREE(db_info);        /* Not sure whether we need to do anything
 464                                    useful with these */
 465
 466           /* Send message to smbd */
 467
 468           send_repl_message(low_serial);
 469
 470           break;
 471   }
 472
 473     default:
 474     {
 475       DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 476       return;
 477     }
 478   }
 479 }