release/src/router/samba/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   pstring ascuser;
  55   char *unicomp; /* Unicode computer name. */
  56
  57   memset(outbuf, 0, sizeof(outbuf));
  58
  59   if (!lp_domain_logons())
  60   {
  61     DEBUG(3,("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   strupper(my_name);
  68
  69   code = SVAL(buf,0);
  70   DEBUG(1,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
  71
  72   switch (code)
  73   {
  74     case 0:
  75     {
  76       char *q = buf + 2;
  77       char *machine = q;
  78       char *user = skip_string(machine,1);
  79
  80       getdc = skip_string(user,1);
  81       q = skip_string(getdc,1);
  82       token = SVAL(q,3);
  83
  84       fstrcpy(reply_name,my_name);
  85
  86       DEBUG(3,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
  87              machine,inet_ntoa(p->ip),user,token));
  88
  89       q = outbuf;
  90       SSVAL(q, 0, 6);
  91       q += 2;
  92
  93       fstrcpy(reply_name, "\\\\");
  94       fstrcat(reply_name, my_name);
  95       fstrcpy(q, reply_name); q = skip_string(q, 1); /* PDC name */
  96
  97       SSVAL(q, 0, token);
  98       q += 2;
  99
 100       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 101
 102       send_mailslot(True, getdc,
 103                     outbuf,PTR_DIFF(q,outbuf),
 104                     global_myname, 0x0,
 105                     dgram->source_name.name,
 106                     dgram->source_name.name_type,
 107                     p->ip, *iface_ip(p->ip), p->port);
 108       break;
 109     }
 110
 111     case QUERYFORPDC:
 112     {
 113       char *q = buf + 2;
 114       char *machine = q;
 115
 116       getdc = skip_string(machine,1);
 117       q = skip_string(getdc,1);
 118       q = ALIGN2(q, buf);
 119
 120       /* at this point we can work out if this is a W9X or NT style
 121          request. Experiments show that the difference is wether the
 122          packet ends here. For a W9X request we now end with a pair of
 123          bytes (usually 0xFE 0xFF) whereas with NT we have two further
 124          strings - the following is a simple way of detecting this */
 125       if (len - PTR_DIFF(q, buf) <= 3) {
 126               short_request = True;
 127       } else {
 128               unicomp = q;
 129
 130               /* A full length (NT style) request */
 131               q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 132
 133               if (len - PTR_DIFF(q, buf) > 8) {
 134                                         /* with NT5 clients we can sometimes
 135                                            get additional data - a length specificed string
 136                                            containing the domain name, then 16 bytes of
 137                                            data (no idea what it is) */
 138                                         int dom_len = CVAL(q, 0);
 139                                         q++;
 140                                         if (dom_len != 0) {
 141                                                 q += dom_len + 1;
 142                                         }
 143                                         q += 16;
 144               }
 145               ntversion = IVAL(q, 0);
 146               lmnttoken = SVAL(q, 4);
 147               lm20token = SVAL(q, 6);
 148       }
 149
 150       /* Construct reply. */
 151       q = outbuf;
 152       SSVAL(q, 0, QUERYFORPDC_R);
 153       q += 2;
 154
 155       fstrcpy(reply_name,my_name);
 156       fstrcpy(q, reply_name);
 157       q = skip_string(q, 1); /* PDC name */
 158
 159       /* PDC and domain name */
 160       if (!short_request)  /* Make a full reply */
 161       {
 162         q = ALIGN2(q, buf);
 163
 164         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 165         q += dos_PutUniCode(q, global_myworkgroup,sizeof(pstring), True); /* Domain name*/
 166
 167         SIVAL(q, 0, 1); /* our nt version */
 168         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 169         SSVAL(q, 6, 0xffff); /* our lm20token */
 170         q += 8;
 171       }
 172
 173       /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 174
 175       DEBUG(3,("process_logon_packet: GETDC request from %s at IP %s, \
 176 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 177             machine,inet_ntoa(p->ip), reply_name, global_myworkgroup,
 178             QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 179             (uint32)lm20token ));
 180
 181       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 182
 183       send_mailslot(True, getdc,
 184                   outbuf,PTR_DIFF(q,outbuf),
 185                     global_myname, 0x0,
 186                   dgram->source_name.name,
 187                   dgram->source_name.name_type,
 188                   p->ip, *iface_ip(p->ip), p->port);
 189       return;
 190     }
 191
 192     case SAMLOGON:
 193     {
 194       char *q = buf + 2;
 195
 196       q += 2;
 197       unicomp = q;
 198       uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 199       getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 200       q = skip_string(getdc,1);
 201       q += 4; /* Account Control Bits - indicating username type */
 202       domainsidsize = IVAL(q, 0);
 203       q += 4;
 204
 205       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 206
 207       if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 208               q += domainsidsize;
 209               q = ALIGN4(q, buf);
 210       }
 211
 212       DEBUG(3,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %d\n", len, PTR_DIFF(q, buf) ));
 213
 214       if (len - PTR_DIFF(q, buf) > 8) {
 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 < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 222                       q += dom_len + 1;
 223               }
 224               q += 16;
 225       }
 226
 227       ntversion = IVAL(q, 0);
 228       lmnttoken = SVAL(q, 4);
 229       lm20token = SVAL(q, 6);
 230       q += 8;
 231
 232       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 233
 234       /*
 235        * we respond regadless of whether the machine is in our password
 236        * database. If it isn't then we let smbd send an appropriate error.
 237        * Let's ignore the SID.
 238        */
 239
 240       pstrcpy(ascuser, dos_unistr(uniuser));
 241       DEBUG(3,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 242
 243       fstrcpy(reply_name,"\\\\"); /* Here it wants \\LOGONSERVER. */
 244       fstrcpy(reply_name+2,my_name);
 245
 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                dos_unistr(unicomp),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 }