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
|
/* _ _
** _ __ ___ ___ __| | ___ ___| | mod_ssl
** | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
** | | | | | | (_) | (_| | \__ \__ \ | www.modssl.org
** |_| |_| |_|\___/ \__,_|___|___/___/_| ftp.modssl.org
** |_____|
** ssl_expr_eval.c
** Expression Evaluation
*/
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*/
/* ``Make love,
not software!''
-- Unknown */
#include "mod_ssl.h"
/* _________________________________________________________________
**
** Expression Evaluation
** _________________________________________________________________
*/
static BOOL ssl_expr_eval_comp(request_rec *, ssl_expr *);
static char *ssl_expr_eval_word(request_rec *, ssl_expr *);
static char *ssl_expr_eval_func_file(request_rec *, char *);
static int ssl_expr_eval_strcmplex(char *, char *);
BOOL ssl_expr_eval(request_rec *r, ssl_expr *node)
{
switch (node->node_op) {
case op_True: {
return TRUE;
}
case op_False: {
return FALSE;
}
case op_Not: {
ssl_expr *e = (ssl_expr *)node->node_arg1;
return (!ssl_expr_eval(r, e));
}
case op_Or: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval(r, e1) || ssl_expr_eval(r, e2));
}
case op_And: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval(r, e1) && ssl_expr_eval(r, e2));
}
case op_Comp: {
ssl_expr *e = (ssl_expr *)node->node_arg1;
return ssl_expr_eval_comp(r, e);
}
default: {
ssl_expr_error = "Internal evaluation error: Unknown expression node";
return FALSE;
}
}
}
static BOOL ssl_expr_eval_comp(request_rec *r, ssl_expr *node)
{
switch (node->node_op) {
case op_EQ: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (strcmp(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) == 0);
}
case op_NE: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (strcmp(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) != 0);
}
case op_LT: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) < 0);
}
case op_LE: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) <= 0);
}
case op_GT: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) > 0);
}
case op_GE: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) >= 0);
}
case op_IN: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
ssl_expr *e3;
char *w1 = ssl_expr_eval_word(r, e1);
BOOL found = FALSE;
do {
e3 = (ssl_expr *)e2->node_arg1;
e2 = (ssl_expr *)e2->node_arg2;
if (strcmp(w1, ssl_expr_eval_word(r, e3)) == 0) {
found = TRUE;
break;
}
} while (e2 != NULL);
return found;
}
case op_REG: {
ssl_expr *e1;
ssl_expr *e2;
char *word;
regex_t *regex;
e1 = (ssl_expr *)node->node_arg1;
e2 = (ssl_expr *)node->node_arg2;
word = ssl_expr_eval_word(r, e1);
regex = (regex_t *)(e2->node_arg1);
return (ap_regexec(regex, word, 0, NULL, 0) == 0);
}
case op_NRE: {
ssl_expr *e1;
ssl_expr *e2;
char *word;
regex_t *regex;
e1 = (ssl_expr *)node->node_arg1;
e2 = (ssl_expr *)node->node_arg2;
word = ssl_expr_eval_word(r, e1);
regex = (regex_t *)(e2->node_arg1);
return !(ap_regexec(regex, word, 0, NULL, 0) == 0);
}
default: {
ssl_expr_error = "Internal evaluation error: Unknown expression node";
return FALSE;
}
}
}
static char *ssl_expr_eval_word(request_rec *r, ssl_expr *node)
{
switch (node->node_op) {
case op_Digit: {
char *string = (char *)node->node_arg1;
return string;
}
case op_String: {
char *string = (char *)node->node_arg1;
return string;
}
case op_Var: {
char *var = (char *)node->node_arg1;
char *val = ssl_var_lookup(r->pool, r->server, r->connection, r, var);
return (val == NULL ? "" : val);
}
case op_Func: {
char *name = (char *)node->node_arg1;
ssl_expr *args = (ssl_expr *)node->node_arg2;
if (strEQ(name, "file"))
return ssl_expr_eval_func_file(r, (char *)(args->node_arg1));
else {
ssl_expr_error = "Internal evaluation error: Unknown function name";
return "";
}
}
default: {
ssl_expr_error = "Internal evaluation error: Unknown expression node";
return FALSE;
}
}
}
static char *ssl_expr_eval_func_file(request_rec *r, char *filename)
{
apr_file_t *fp;
char *buf;
apr_off_t offset;
apr_size_t len;
apr_finfo_t finfo;
if (apr_file_open(&fp, filename, APR_READ|APR_BUFFERED,
APR_OS_DEFAULT, r->pool) != APR_SUCCESS) {
ssl_expr_error = "Cannot open file";
return "";
}
apr_file_info_get(&finfo, APR_FINFO_SIZE, fp);
if ((finfo.size + 1) != ((apr_size_t)finfo.size + 1)) {
ssl_expr_error = "Huge file cannot be read";
apr_file_close(fp);
return "";
}
len = (apr_size_t)finfo.size;
if (len == 0) {
buf = (char *)apr_palloc(r->pool, sizeof(char) * 1);
*buf = NUL;
}
else {
if ((buf = (char *)apr_palloc(r->pool, sizeof(char)*(len+1))) == NULL) {
ssl_expr_error = "Cannot allocate memory";
apr_file_close(fp);
return "";
}
offset = 0;
apr_file_seek(fp, APR_SET, &offset);
if (apr_file_read(fp, buf, &len) != APR_SUCCESS) {
ssl_expr_error = "Cannot read from file";
apr_file_close(fp);
return "";
}
buf[len] = NUL;
}
apr_file_close(fp);
return buf;
}
/* a variant of strcmp(3) which works correctly also for number strings */
static int ssl_expr_eval_strcmplex(char *cpNum1, char *cpNum2)
{
int i, n1, n2;
if (cpNum1 == NULL)
return -1;
if (cpNum2 == NULL)
return +1;
n1 = strlen(cpNum1);
n2 = strlen(cpNum2);
if (n1 > n2)
return 1;
if (n1 < n2)
return -1;
for (i = 0; i < n1; i++) {
if (cpNum1[i] > cpNum2[i])
return 1;
if (cpNum1[i] < cpNum2[i])
return -1;
}
return 0;
}
|
