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
|
import argparse
import hashlib
import os
import pychrysalide
from pychrysalide.analysis.contents import FileContent
from pychrysalide.format import BinSymbol
from pychrysalide.format.pe import PeFormat
def write_header(directory, name):
"""Ecrit le fichier d'entête pour la transcription d'ordinaux."""
content = '''
/* Chrysalide - Outil d'analyse de fichiers binaires
* cache_%s.h - prototypes pour la fourniture des ordinaux du fichier %s.dll
*
* Copyright (C) 2021 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide 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.
*
* Chrysalide 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 Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _PLUGINS_WINORDINALS_CACHE_%s_H
#define _PLUGINS_WINORDINALS_CACHE_%s_H
#include <stdint.h>
/* Indique la liste de bibliothèques enregistrées avec ordinaux. */
const char *find_%s_name_for_ordinal(uint16_t);
#endif /* _PLUGINS_WINORDINALS_CACHE_%s_H */
''' \
% (name, name, name.upper(), name.upper(), name, name.upper())
with open(os.path.join(directory, 'cache_%s.h' % name), 'w') as fd:
fd.write(content)
def write_code(directory, name, hashes, exported):
"""Ecrit le fichier d'entête pour la transcription d'ordinaux."""
content_prologue = '''
/* Chrysalide - Outil d'analyse de fichiers binaires
* cache_%s.c - fourniture des ordinaux du fichier %s.dll
*
* Copyright (C) 2021 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide 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.
*
* Chrysalide 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 Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#include "cache_%s.h"
#include <stddef.h>
/**
* Empreintes du fichier %s.dll :
*
* - MD5 : %s
* - SHA1 : %s
* - SHA256 : %s
*/
/* Liste des ordinaux référencés */
''' \
% (name, name, name, name, hashes['md5'], hashes['sha1'], hashes['sha256'])
content_epilogue = '''
/******************************************************************************
* *
* Paramètres : ordinal = valeur ordinale à considérer. *
* *
* Description : Fournit le nom du symbole associé à un ordinal donné. *
* *
* Retour : Désignation du symbole trouvé ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
const char *find_%s_name_for_ordinal(uint16_t ordinal)
{
const char *result; /* Désignation à renvoyer */
if (ordinal >= %u)
result = NULL;
else
result = _%s_ordinals[ordinal];
return result;
}
''' % (name, exported[-1][0] + 1, name)
with open(os.path.join(directory, 'cache_%s.c' % name), 'w') as fd:
fd.write(content_prologue)
fd.write('static const char *_%s_ordinals[%u] = {\n' % (name, exported[-1][0] + 1))
for e in exported:
fd.write(' [%u] = "%s",\n' % (e[0], e[1]))
fd.write('};\n')
fd.write(content_epilogue)
def get_internal_name(filename):
"""Fournit le nom de la bibliothèque pour les désignations internes."""
name = os.path.basename(filename)
idx = name.find('.')
name = name[:idx].lower()
return name
def compute_hashs(filename):
"""Calcule les empreintes du fichier analysé."""
with open(filename, 'rb') as fd:
data = fd.read()
hashes = {
'md5': hashlib.md5(data).hexdigest(),
'sha1': hashlib.sha1(data).hexdigest(),
'sha256': hashlib.sha256(data).hexdigest(),
}
return hashes
def retrieve_ordinals(filename):
"""Etablit une liste ordonnée d'ordinaux."""
cnt = FileContent(filename)
fmt = PeFormat(cnt)
fmt.analyze()
exported = []
for s in fmt.symbols:
if s.status == BinSymbol.SymbolStatus.EXPORTED:
exported.append([ s.ordinal, s.name ])
exported = sorted(exported, key=lambda sym: sym[0])
return exported
if __name__ == '__main__':
"""Point d'entrée du script."""
parser = argparse.ArgumentParser()
parser.add_argument('dll', help='path to the library to process')
parser.add_argument('dir', help='output directory for the final C files')
args = parser.parse_args()
name = get_internal_name(args.dll)
hashes = compute_hashs(args.dll)
exported = retrieve_ordinals(args.dll)
write_header(args.dir, name)
write_code(args.dir, name, hashes, exported)
|
