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 pstring global_myname;
  30 extern fstring global_myworkgroup;
  31
  32 /****************************************************************************
  33 Process a domain logon packet
  34 **************************************************************************/
  35
  36 void process_logon_packet(struct packet_struct *p,char *buf,int len,
  37                           char *mailslot)
  38 {
  39   struct dgram_packet *dgram = &p->packet.dgram;
  40   pstring my_name;
  41   fstring reply_name;
  42   pstring outbuf;
  43   int code;
  44   uint16 token = 0;
  45   uint32 ntversion = 0;
  46   uint16 lmnttoken = 0;
  47   uint16 lm20token = 0;
  48   uint32 domainsidsize;
  49   BOOL short_request = False;
  50   char *getdc;
  51   char *uniuser; /* Unicode user name. */
  52   pstring ascuser;
  53   char *unicomp; /* Unicode computer name. */
  54
  55   START_PROFILE(domain_logon);
  56   memset(outbuf, 0, sizeof(outbuf));
  57
  58   if (!lp_domain_logons())
  59   {
  60     DEBUG(3,("process_logon_packet: Logon packet received from IP %s and domain \
  61 logons are not enabled.\n", inet_ntoa(p->ip) ));
  62     goto done;
  63   }
  64
  65   pstrcpy(my_name, global_myname);
  66   strupper(my_name);
  67
  68   code = SVAL(buf,0);
  69   DEBUG(1,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
  70
  71   switch (code)
  72   {
  73     case 0:
  74     {
  75       char *q = buf + 2;
  76       char *machine = q;
  77       char *user = skip_string(machine,1);
  78
  79       getdc = skip_string(user,1);
  80       q = skip_string(getdc,1);
  81       token = SVAL(q,3);
  82
  83       fstrcpy(reply_name,my_name);
  84
  85       DEBUG(3,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
  86              machine,inet_ntoa(p->ip),user,token));
  87
  88       q = outbuf;
  89       SSVAL(q, 0, 6);
  90       q += 2;
  91
  92       fstrcpy(reply_name, "\\\\");
  93       fstrcat(reply_name, my_name);
  94       fstrcpy(q, reply_name); q = skip_string(q, 1); /* PDC name */
  95
  96       SSVAL(q, 0, token);
  97       q += 2;
  98
  99       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 100
 101       send_mailslot(True, getdc,
 102                     outbuf,PTR_DIFF(q,outbuf),
 103                     global_myname, 0x0,
 104                                         machine,
 105                     dgram->source_name.name_type,
 106                     p->ip, *iface_ip(p->ip), p->port);
 107       break;
 108     }
 109
 110     case QUERYFORPDC:
 111     {
 112       char *q = buf + 2;
 113       char *machine = q;
 114
 115       if (!lp_domain_master())
 116       {
 117          /* We're not Primary Domain Controller -- ignore this */
 118          goto done;
 119       }
 120
 121       getdc = skip_string(machine,1);
 122       q = skip_string(getdc,1);
 123       q = ALIGN2(q, buf);
 124
 125       /* at this point we can work out if this is a W9X or NT style
 126          request. Experiments show that the difference is wether the
 127          packet ends here. For a W9X request we now end with a pair of
 128          bytes (usually 0xFE 0xFF) whereas with NT we have two further
 129          strings - the following is a simple way of detecting this */
 130       if (len - PTR_DIFF(q, buf) <= 3) {
 131               short_request = True;
 132       } else {
 133               unicomp = q;
 134
 135               /* A full length (NT style) request */
 136               q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
 137
 138               if (len - PTR_DIFF(q, buf) > 8) {
 139                                         /* with NT5 clients we can sometimes
 140                                            get additional data - a length specificed string
 141                                            containing the domain name, then 16 bytes of
 142                                            data (no idea what it is) */
 143                                         int dom_len = CVAL(q, 0);
 144                                         q++;
 145                                         if (dom_len != 0) {
 146                                                 q += dom_len + 1;
 147                                         }
 148                                         q += 16;
 149               }
 150               ntversion = IVAL(q, 0);
 151               lmnttoken = SVAL(q, 4);
 152               lm20token = SVAL(q, 6);
 153       }
 154
 155       /* Construct reply. */
 156       q = outbuf;
 157       SSVAL(q, 0, QUERYFORPDC_R);
 158       q += 2;
 159
 160       fstrcpy(reply_name,my_name);
 161       fstrcpy(q, reply_name);
 162       q = skip_string(q, 1); /* PDC name */
 163
 164       /* PDC and domain name */
 165       if (!short_request)  /* Make a full reply */
 166       {
 167         q = ALIGN2(q, outbuf);
 168
 169         q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
 170         q += dos_PutUniCode(q, global_myworkgroup,sizeof(pstring), True); /* Domain name*/
 171
 172         SIVAL(q, 0, 1); /* our nt version */
 173         SSVAL(q, 4, 0xffff); /* our lmnttoken */
 174         SSVAL(q, 6, 0xffff); /* our lm20token */
 175         q += 8;
 176       }
 177
 178       /* RJS, 21-Feb-2000, we send a short reply if the request was short */
 179
 180       DEBUG(3,("process_logon_packet: GETDC request from %s at IP %s, \
 181 reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
 182             machine,inet_ntoa(p->ip), reply_name, global_myworkgroup,
 183             QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
 184             (uint32)lm20token ));
 185
 186       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 187
 188       send_mailslot(True, getdc,
 189                   outbuf,PTR_DIFF(q,outbuf),
 190                     global_myname, 0x0,
 191                   dgram->source_name.name,
 192                   dgram->source_name.name_type,
 193                   p->ip, *iface_ip(p->ip), p->port);
 194       goto done;
 195     }
 196
 197     case SAMLOGON:
 198     {
 199       char *q = buf + 2;
 200
 201       q += 2;
 202       unicomp = q;
 203       uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
 204       getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
 205       q = skip_string(getdc,1);
 206       q += 4; /* Account Control Bits - indicating username type */
 207       domainsidsize = IVAL(q, 0);
 208       q += 4;
 209
 210       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
 211
 212       if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
 213               q += domainsidsize;
 214               q = ALIGN4(q, buf);
 215       }
 216
 217       DEBUG(3,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %d\n", len, PTR_DIFF(q, buf) ));
 218
 219       if (len - PTR_DIFF(q, buf) > 8) {
 220               /* with NT5 clients we can sometimes
 221                  get additional data - a length specificed string
 222                  containing the domain name, then 16 bytes of
 223                  data (no idea what it is) */
 224               int dom_len = CVAL(q, 0);
 225               q++;
 226               if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
 227                       q += dom_len + 1;
 228               }
 229               q += 16;
 230       }
 231
 232       ntversion = IVAL(q, 0);
 233       lmnttoken = SVAL(q, 4);
 234       lm20token = SVAL(q, 6);
 235       q += 8;
 236
 237       DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
 238
 239       /*
 240        * we respond regadless of whether the machine is in our password
 241        * database. If it isn't then we let smbd send an appropriate error.
 242        * Let's ignore the SID.
 243        */
 244
 245       pstrcpy(ascuser, dos_unistr(uniuser));
 246       DEBUG(3,("process_logon_packet: SAMLOGON user %s\n", ascuser));
 247
 248       fstrcpy(reply_name,"\\\\"); /* Here it wants \\LOGONSERVER. */
 249       fstrcpy(reply_name+2,my_name);
 250
 251       DEBUG(3,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
 252                dos_unistr(unicomp),inet_ntoa(p->ip), ascuser, reply_name, global_myworkgroup,
 253                SAMLOGON_R ,lmnttoken));
 254
 255       /* Construct reply. */
 256
 257       q = outbuf;
 258       if (SVAL(uniuser, 0) == 0) {
 259               SSVAL(q, 0, SAMLOGON_UNK_R);      /* user unknown */
 260       } else {
 261               SSVAL(q, 0, SAMLOGON_R);
 262       }
 263       q += 2;
 264
 265       q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
 266       q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
 267       q += dos_PutUniCode(q, global_myworkgroup,sizeof(pstring), True);
 268
 269       /* tell the client what version we are */
 270       SIVAL(q, 0, 1); /* our ntversion */
 271       SSVAL(q, 4, 0xffff); /* our lmnttoken */
 272       SSVAL(q, 6, 0xffff); /* our lm20token */
 273       q += 8;
 274
 275       dump_data(4, outbuf, PTR_DIFF(q, outbuf));
 276
 277       send_mailslot(True, getdc,
 278                    outbuf,PTR_DIFF(q,outbuf),
 279                     global_myname, 0x0,
 280                    dgram->source_name.name,
 281                    dgram->source_name.name_type,
 282                    p->ip, *iface_ip(p->ip), p->port);
 283       break;
 284     }
 285
 286     default:
 287     {
 288       DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
 289       goto done;
 290     }
 291   }
 292 done:
 293   END_PROFILE(domain_logon);
 294 }