summaryrefslogtreecommitdiff
path: root/source4/scripting/bin/autoidl
blob: eed4ba3a80bb1bbeded64f1e2828aa2fa546e7dd (plain)
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
#!/usr/bin/python
# -*- coding: utf-8 -*-

# Unix SMB/CIFS implementation.
# Copyright © Jelmer Vernooij <jelmer@samba.org> 2008
#   
# 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 3 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, see <http://www.gnu.org/licenses/>.
#

import sys

MAX_OPNUM = 1000
MAX_BASE_SIZE = 0x1000
MAX_IFACE_VERSION = 1000

DCERPC_FAULT_OP_RNG_ERROR = 0x1c010002
DCERPC_FAULT_NDR = 0x6f7
NT_STATUS_NET_WRITE_FAULT = -1073741614


sys.path.insert(0, "bin/python")

from samba.dcerpc import ClientConnection

def find_num_funcs(conn):
    for i in xrange(MAX_OPNUM):
        try:
            conn.request(i, "")
        except RuntimeError, (num, msg):
            if num == DCERPC_FAULT_OP_RNG_ERROR:
                return i
    raise Exception("More than %d functions" % MAX_OPNUM)

class Function:
    def __init__(self, conn, opnum):
        self.conn = conn
        self.opnum = opnum

    def request(self, data):
        assert isinstance(data, str)
        self.conn.request(self.opnum, data)

    def valid_ndr(self, data):
        try:
            self.request(data)
        except RuntimeError, (num, msg):
            if num == DCERPC_FAULT_NDR:
                return False
        return True

    def find_base_request(self, start=""):
        """Find the smallest possible request that we can do that is 
        valid. 
        
        This generally means sending all zeroes so we get NULL pointers where 
        possible."""
        # TODO: Don't try with just 0's as there may be switch_is() variables
        # for which 0 is not a valid value or variables with range() set
        # See how much input bytes we need
        for i in range(MAX_BASE_SIZE):
            data = start + chr(0) * i
            if self.valid_ndr(data):
                return data
        return None

    def check_decision_byte(self, base_request, i):
        """Check whether the specified byte is a possible "decision" byte, 
        e.g. a byte that is part of a pointer, array size variable or 
        discriminant.
        
        Note that this function only checks if a byte is definitely a decision 
        byte. It may return False in some cases while the byte is actually 
        a decision byte."""
        data = list(base_request)
        data[i] = chr(1)
        return not self.valid_ndr("".join(data))

    def find_deferrant_data(self, base_request, idx):
        data = list(base_request)
        data[idx*4] = chr(1)
        # Just check that this is a pointer to something non-empty:
        assert not self.valid_ndr("".join(data))

        newdata = self.find_base_request("".join(data))

        if newdata is None:
            return None
        
        assert newdata.startswith(data)

        return newdata[len(data):]

    def find_idl(self):
        base_request = self.find_base_request()

        if base_request is None:
            raise Exception("Unable to determine base size for opnum %d" % self.opnum)

        print "\tBase request is %r" % base_request

        decision_byte_map = map(lambda x: self.check_decision_byte(base_request, x), range(len(base_request)))

        print decision_byte_map
        
        # find pointers
        possible_pointers = map(all, 
            [decision_byte_map[i*4:(i+1)*4] for i in range(int(len(base_request)/4))])
        print possible_pointers

        pointer_deferrant_bases = map(
            lambda x: self.find_deferrant_data(base_request, x) if possible_pointers[x] else None, range(len(possible_pointers)))

        print pointer_deferrant_bases


if len(sys.argv) < 3:
    print "Usage: autoidl <binding> <UUID> [<version>]"
    sys.exit(1)

(binding, uuid) = sys.argv[1:3]
if len(sys.argv) == 4:
    version = sys.argv[3]
else:
    version = None

if version is None:
    for i in range(MAX_IFACE_VERSION):
        try:
            conn = ClientConnection(binding, (uuid, i))
        except RuntimeError, (num, msg):
            if num == NT_STATUS_NET_WRITE_FAULT:
                continue
            raise
        else:
            break
else:
    conn = ClientConnection(binding, (uuid, version))

print "Figuring out number of connections...",
num_funcs = find_num_funcs(conn)
print "%d" % num_funcs

# Figure out the syntax for each one
for i in range(num_funcs):
    print "Function %d" % i
    data = Function(conn, i)
    try:
        data.find_idl()
    except Exception, e:
        print "Error: %r" % e