source/nmbd/nmbd_processlogon.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1998
   6    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   7    Copyright (C) Jeremy Allison 1994-1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23    Revision History:
  24
  25 */
  26
  27 #include "includes.h"
  28
  29 extern int DEBUGLEVEL;
  30
  31 extern pstring global_myname;
  32 extern fstring global_myworkgroup;
  33
  34 /****************************************************************************
  35 Process a domain logon packet
  36 **************************************************************************/
  37
  38 void process_logon_packet(struct packet_struct *p,char *buf,int len,
  39                           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   char *unicomp; /* Unicode computer name. */
  55   pstring ascuser;
  56   pstring asccomp;
  57
  58   memset(outbuf, 0, sizeof(outbuf));
  59
  60   if (!lp_domain_logons())
  61   {
  62     DEBUG(3,("process_logon_packet: Logon packet received from IP %s and domain \
  63 logons are not enabled.\n", inet_ntoa(p->ip) ));
  64     return;
  65   }
  66
  67   pstrcpy(my_name, global_myname);
  68   strupper(my_name);
  69
  70   code = SVAL(buf,0);
  71   DEBUG(1,("process_logon_packet: Logon from %s: code = %x\n", inet_ntoa(p->ip), code));
  72
  73   dump_data(4, buf, len);
  74
  75   switch (code)
  76   {
  77     case 0:
  78     {
  79       char *q = buf + 2;
  80       char *machine = q;
  81       char *user = skip_string(machine,1);
  82
  83       getdc = skip_string(user,1);
  84       q = skip_string(getdc,1);
  85       token = SVAL(q,3);
  86
  87       fstrcpy(reply_name,my_name);
  88
  89       DEBUG(3,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
  90              machine,inet_ntoa(p->ip),user,token));
  91
  92       q = outbuf;
  93       SSVAL(q, 0, 6);
  94       q += 2;
  95
  96       fstrcpy(reply_name, "\\\\");
  97       fstrcat(reply_name, my_name);
  98       fstrcpy(q, reply_name); q = skip_string(q, 1); /* PDC name */
  99
 100       SSVAL(q, 0, token);
 101       q += 2;
 102
 103       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 104
 105       send_mailslot(True, getdc,
 106                     outbuf,PTR_DIFF(q,outbuf),
 107                     global_myname, 0x0,
 108                     dgram->source_name.name,
 109                     dgram->source_name.name_type,
 110                     p->ip, *iface_ip(p->ip), p->port);
 111       break;
 112     }
 113
 114     case QUERYFORPDC:
 115     {
 116       char *q = buf + 2;
 117       char *machine = q;
 118
 119       getdc = skip_string(machine,1);
 120       q = skip_string(getdc,1);
 121       q = ALIGN2(q, buf);
 122
 123       /* at this point we can work out if this is a W9X or NT style
 124          request. Experiments show that the difference is wether the
 125          packet ends here. For a W9X request we now end with a pair of
 126          bytes (usually 0xFE 0xFF) whereas with NT we have two further
 127          strings - the following is a simple way of detecting this */
 128       if (len - PTR_DIFF(q, buf) <= 3) {
 129               short_request = True;
 130       } else {
 131               unicomp = q;
 132
 133               /* A full length (NT style) request */
 134               q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 135
 136               if (len - PTR_DIFF(q, buf) > 8) {
 137                                         /* with NT5 clients we can sometimes
 138                                            get additional data - a length specificed string
 139                                            containing the domain name, then 16 bytes of
 140                                            data (no idea what it is) */
 141                                         int dom_len = CVAL(q, 0);
 142                                         q++;
 143                                         if (dom_len != 0) {
 144                                                 q += dom_len + 1;
 145                                         }
 146                                         q += 16;
 147               }
 148               ntversion = IVAL(q, 0);
 149               lmnttoken = SVAL(q, 4);
 150               lm20token = SVAL(q, 6);
 151       }
 152
 153       /* Construct reply. */
 154       q = outbuf;
 155       SSVAL(q, 0, QUERYFORPDC_R);
 156       q += 2;
 157
 158       fstrcpy(reply_name,my_name);
 159       fstrcpy(q, reply_name);
 160       q = skip_string(q, 1); /* PDC name */
 161
 162       /* PDC and domain name */
 163       if (!short_request)  /* Make a full reply */
 164       {
 165         q = ALIGN2(q, buf);
 166
 167         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 168         q += dos_PutUniCode(q, global_myworkgroup,sizeof(pstring), True); /* Domain name*/
 169
 170         SIVAL(q, 0, 1); /* our nt version */
 171         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 172         SSVAL(q, 6, 0xffff); /* our lm20token */
 173         q += 8;
 174       }
 175
 176       /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 177
 178       DEBUG(3,("process_logon_packet: GETDC request from %s at IP %s, \
 179 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 180             machine,inet_ntoa(p->ip), reply_name, global_myworkgroup,
 181             QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 182             (uint32)lm20token ));
 183
 184       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 185
 186       send_mailslot(True, getdc,
 187                   outbuf,PTR_DIFF(q,outbuf),
 188                     global_myname, 0x0,
 189                     dgram->source_name.name,
 190                     dgram->source_name.name_type,
 191                   p->ip, *iface_ip(p->ip), p->port);
 192       return;
 193     }
 194
 195     case SAMLOGON:
 196     {
 197       char *q = buf + 2;
 198
 199       q += 2;
 200       unicomp = q;
 201       uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 202       getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 203       q = skip_string(getdc,1);
 204       q += 4; /* Account Control Bits - indicating username type */
 205       domainsidsize = IVAL(q, 0);
 206       q += 4;
 207
 208       if (domainsidsize != 0)
 209         {
 210                 q += domainsidsize;
 211               q = ALIGN4(q, buf);
 212         }
 213               if (len - PTR_DIFF(q, buf) > 8)
 214               {
 215                         /* with NT5 clients we can sometimes
 216                            get additional data - a length specificed string
 217                            containing the domain name, then 16 bytes of
 218                            data (no idea what it is) */
 219                         int dom_len = CVAL(q, 0);
 220                         q++;
 221                         if (dom_len != 0) {
 222                                 q += dom_len + 1;
 223                         }
 224                         q += 16;
 225               }
 226       ntversion = IVAL(q, 0);
 227       lmnttoken = SVAL(q, 4);
 228       lm20token = SVAL(q, 6);
 229       q += 8;
 230
 231       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 232
 233       /*
 234        * we respond regadless of whether the machine is in our password
 235        * database. If it isn't then we let smbd send an appropriate error.
 236        * Let's ignore the SID.
 237        */
 238
 239       unibuf_to_ascii(ascuser, uniuser, sizeof(ascuser)-1);
 240       DEBUG(3,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 241
 242       fstrcpy(reply_name,"\\\\"); /* Here it wants \\LOGONSERVER. */
 243       fstrcpy(reply_name+2,my_name);
 244
 245       unibuf_to_ascii(asccomp, unicomp, sizeof(asccomp)-1);
 246       DEBUG(3,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 247                asccomp,inet_ntoa(p->ip), ascuser, reply_name, global_myworkgroup,
 248                SAMLOGON_R ,lmnttoken));
 249
 250       /* Construct reply. */
 251
 252       q = outbuf;
 253       if (SVAL(uniuser, 0) == 0) {
 254               SSVAL(q, 0, SAMLOGON_UNK_R);      /* user unknown */
 255       } else {
 256               SSVAL(q, 0, SAMLOGON_R);
 257       }
 258       q += 2;
 259
 260       q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
 261       q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
 262       q += dos_PutUniCode(q, global_myworkgroup,sizeof(pstring), True);
 263
 264       /* tell the client what version we are */
 265       SIVAL(q, 0, 1); /* our ntversion */
 266       SSVAL(q, 4, 0xffff); /* our lmnttoken */
 267       SSVAL(q, 6, 0xffff); /* our lm20token */
 268       q += 8;
 269
 270       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 271
 272       send_mailslot(True, getdc,
 273                    outbuf,PTR_DIFF(q,outbuf),
 274                     global_myname, 0x0,
 275                     dgram->source_name.name,
 276                     dgram->source_name.name_type,
 277                    p->ip, *iface_ip(p->ip), p->port);
 278       break;
 279     }
 280
 281     default:
 282     {
 283       DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 284       return;
 285     }
 286   }
 287 }