File: policy_scan.l

package info (click to toggle)
setools 3.3.7-3
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 9,840 kB
  • sloc: ansic: 82,247; tcl: 13,145; cpp: 4,885; makefile: 1,603; yacc: 779; lex: 296; python: 57; sh: 50
file content (320 lines) | stat: -rw-r--r-- 7,540 bytes parent folder | download
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
320
/**
 * @file policy_parse.y
 *
 * This file is based upon checkpolicy/policy_scan.l fram NSA's SVN
 * repository.  It has been modified to support older policy formats.
 *
 * Author : Stephen Smalley, <sds@epoch.ncsc.mil> 
 *
 * Updated: David Caplan, <dac@tresys.com>
 *
 * 	Added conditional policy language extensions
 *
 *          Jason Tang    <jtang@tresys.com>
 *
 *	Added support for binary policy modules
 *
 * Copyright (C) 2003-5 Tresys Technology, LLC
 *	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, version 2.
 */

/* FLASK */

%{
#undef YY_INPUT
#define YY_INPUT(b, r, ms) (r = qpol_src_yyinput(b, ms))
%}

%{
#include <sys/types.h>
#include <limits.h>
#include <stdint.h>
#include <string.h>

typedef int (* require_func_t)();

#include "policy_parse.h"

static char linebuf[2][255];
static unsigned int lno = 0;
int yywarn(char *msg);

void set_source_file(const char *name);

char source_file[PATH_MAX];
unsigned long source_lineno = 1;

unsigned long policydb_lineno = 1;

unsigned int policydb_errors = 0;

/* redefine input so we can read from a string */
/* borrowed from O'Reilly lex and yacc pg 157 */
extern char qpol_src_input[];
extern char *qpol_src_inputptr;/* current position in myinput */
extern char *qpol_src_inputlim;/* end of data */
int qpol_src_yyinput(char *buf, int max_size);

%}

%option nounput
%option noyywrap

%array
letter  [A-Za-z]
digit   [0-9]
alnum   [a-zA-Z0-9]
hexval	[0-9A-Fa-f]

%%
\n.*				{ strncpy(linebuf[lno], yytext+1, 255);
                                  linebuf[lno][254] = 0;
                                  lno = 1 - lno; 
                                  policydb_lineno++;
				  source_lineno++;
                                  yyless(1); }
CLONE |
clone				{ return(CLONE); }
COMMON |
common				{ return(COMMON); }
CLASS |
class				{ return(CLASS); }
CONSTRAIN |
constrain			{ return(CONSTRAIN); }
VALIDATETRANS |
validatetrans			{ return(VALIDATETRANS); }
INHERITS |
inherits			{ return(INHERITS); }
SID |
sid				{ return(SID); }
ROLE |
role				{ return(ROLE); }
ROLES |
roles				{ return(ROLES); }
TYPES |
types				{ return(TYPES); }
TYPEALIAS |
typealias			{ return(TYPEALIAS); }
TYPEATTRIBUTE |
typeattribute			{ return(TYPEATTRIBUTE); }
TYPEBOUNDS |
typebounds			{ return(TYPEBOUNDS); }
TYPE |
type				{ return(TYPE); }
BOOL |
bool                            { return(BOOL); }
IF |
if				{ return(IF); }
ELSE |
else				{ return(ELSE); }
ALIAS |
alias				{ return(ALIAS); }
ATTRIBUTE |
attribute			{ return(ATTRIBUTE); }
TYPE_TRANSITION |
type_transition			{ return(TYPE_TRANSITION); }
TYPE_MEMBER |
type_member			{ return(TYPE_MEMBER); }
TYPE_CHANGE |
type_change			{ return(TYPE_CHANGE); }
ROLE_TRANSITION |
role_transition			{ return(ROLE_TRANSITION); }
RANGE_TRANSITION |
range_transition		{ return(RANGE_TRANSITION); }
SENSITIVITY |
sensitivity			{ return(SENSITIVITY); }
DOMINANCE |
dominance			{ return(DOMINANCE); }
CATEGORY |
category			{ return(CATEGORY); }
LEVEL |
level				{ return(LEVEL); }
RANGE |
range				{ return(RANGE); }
MLSCONSTRAIN |
mlsconstrain			{ return(MLSCONSTRAIN); }
MLSVALIDATETRANS |
mlsvalidatetrans		{ return(MLSVALIDATETRANS); }
USER |
user				{ return(USER); }
NEVERALLOW |
neverallow		        { return(NEVERALLOW); }
ALLOW |
allow			        { return(ALLOW); }
AUDITALLOW |
auditallow		        { return(AUDITALLOW); }
AUDITDENY |
auditdeny		        { return(AUDITDENY); }
DONTAUDIT |
dontaudit                       { return(DONTAUDIT); }
SOURCE |
source			        { return(SOURCE); }
TARGET |
target			        { return(TARGET); }
SAMEUSER |
sameuser			{ return(SAMEUSER);}
module|MODULE                   { return(MODULE); }
require|REQUIRE                 { return(REQUIRE); }
optional|OPTIONAL               { return(OPTIONAL); }
OR |
or     			        { return(OR);}
AND |
and				{ return(AND);}
NOT |
not				{ return(NOT);}
xor |
XOR                             { return(XOR); }
eq |
EQ				{ return(EQUALS);}
true |
TRUE                            { return(CTRUE); } 
false |
FALSE                           { return(CFALSE); } 
dom |
DOM				{ return(DOM);}
domby |
DOMBY				{ return(DOMBY);}
INCOMP |
incomp				{ return(INCOMP);}
fscon |
FSCON                           { return(FSCON);}
portcon |
PORTCON				{ return(PORTCON);}
netifcon |                     
NETIFCON			{ return(NETIFCON);}
nodecon |                     
NODECON				{ return(NODECON);}
fs_use_psid |
FS_USE_PSID			{ return(FSUSEPSID);}
pirqcon |
PIRQCON  		        { return(PIRQCON);}
iomemcon |
IOMEMCON            		{ return(IOMEMCON);}
ioportcon |
IOPORTCON           		{ return(IOPORTCON);}
pcidevicecon |
PCIDEVICECON           		{ return(PCIDEVICECON);}
fs_use_xattr |
FS_USE_XATTR			{ return(FSUSEXATTR);}
fs_use_task |
FS_USE_TASK                     { return(FSUSETASK);}
fs_use_trans |
FS_USE_TRANS                    { return(FSUSETRANS);}
genfscon |
GENFSCON                        { return(GENFSCON);}
r1 |
R1				{ return(R1); }
r2 |
R2				{ return(R2); }
r3 |
R3				{ return(R3); }
u1 |
U1				{ return(U1); }
u2 |
U2				{ return(U2); }
u3 |
U3				{ return(U3); }
t1 |
T1				{ return(T1); }
t2 |
T2				{ return(T2); }
t3 |
T3				{ return(T3); }
l1 |
L1				{ return(L1); }
l2 |
L2				{ return(L2); }
h1 |
H1				{ return(H1); }
h2 |
H2				{ return(H2); }
policycap |
POLICYCAP			{ return(POLICYCAP); }
permissive |
PERMISSIVE			{ return(PERMISSIVE); }
"/"({alnum}|[_\.\-/])*	        { return(PATH); }
{letter}({alnum}|[_\-])*([\.]?({alnum}|[_\-]))*	{ return(IDENTIFIER); }
{digit}+|0x{hexval}+            { return(NUMBER); }
{digit}{1,3}(\.{digit}{1,3}){3}    { return(IPV4_ADDR); }
{hexval}{0,4}":"{hexval}{0,4}":"({hexval}|[:.])*  { return(IPV6_ADDR); }
{digit}+(\.({alnum}|[_.])*)?    { return(VERSION_IDENTIFIER); }
#line[ ]1[ ]\"[^\n]*\"		{ set_source_file(yytext+9); }
#line[ ]{digit}+	        { source_lineno = atoi(yytext+6)-1; }
#[^\n]*                         { /* delete comments */ }
[ \t\f]+			{ /* delete whitespace */ }
"==" 				{ return(EQUALS); }
"!="				{ return (NOTEQUAL); }
"&&"				{ return (AND); }
"||"				{ return (OR); }
"!"				{ return (NOT); }
"^"                             { return (XOR); }
"," |
":" |
";" |
"(" | 
")" |
"{" | 
"}" |
"[" |
"-" |
"." |
"]" |
"~" |
"*"				{ return(yytext[0]); } 
.                               { yywarn("unrecognized character");}
%%
int yyerror(char *msg)
{
	if (source_file[0])
		fprintf(stderr, "%s:%ld:",
			source_file, source_lineno);
	else
		fprintf(stderr, "(unknown source)::");
	fprintf(stderr, "ERROR '%s' at token '%s' on line %ld:\n%s\n%s\n",
			msg,
			yytext,
			policydb_lineno,
			linebuf[0], linebuf[1]);
	policydb_errors++;
	return -1;
}

int yywarn(char *msg)
{
	if (source_file[0])
		fprintf(stderr, "%s:%ld:",
			source_file, source_lineno);
	else
		fprintf(stderr, "(unknown source)::");
	fprintf(stderr, "WARNING '%s' at token '%s' on line %ld:\n%s\n%s\n",
			msg,
			yytext,
			policydb_lineno,
			linebuf[0], linebuf[1]);
	return 0;
}

void set_source_file(const char *name)
{
	source_lineno = 1;
	strncpy(source_file, name, sizeof(source_file)-1); 
	source_file[sizeof(source_file)-1] = '\0';
}

int qpol_src_yyinput(char *buf, int max_size)
{
	int n = max_size < (qpol_src_inputlim - qpol_src_inputptr) ? max_size : (qpol_src_inputlim - qpol_src_inputptr);
	if (n > 0) {
		memcpy(buf, qpol_src_inputptr, n);
		qpol_src_inputptr += n;
	}

	return n;
}

void init_scanner(void)
{
	yy_flush_buffer(YY_CURRENT_BUFFER);
}