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
29extern int DEBUGLEVEL;
30
31extern pstring global_myname;
32extern fstring global_myworkgroup;
33
34/****************************************************************************
35Process a domain logon packet
36**************************************************************************/
37
38void 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 \
62logons 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, \
176reporting %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}
288