github_mirrors/ModSecurity
3
0
Fork 1
mirror of https://github.com/owasp-modsecurity/ModSecurity.git synced 2025-09-29 11:16:33 +03:00
Code Issues Packages Projects Releases Wiki Activity

Add parity transformations. See #516.

Browse Source
This commit is contained in:
brectanus
2008-08-14 23:49:39 +00:00
parent 94370b2c76
commit 458fe8423c
4 changed files with 214 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
apache2/re_tfns.c
View File

@@ -477,6 +477,101 @@ static int msre_fn_normalisePathWin_execute(apr_pool_t *mptmp, unsigned char *in
return changed;
}
/* parityEven7bit */
static int msre_fn_parityEven7bit_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i;
int changed = 0;
if (rval == NULL) return -1;
*rval = NULL;
i = 0;
while(i < input_len) {
unsigned int x = input[i];
input[i] ^= input[i] >> 4;
input[i] &= 0xf;
if ((0x6996 >> input[i]) & 1) {
input[i] = x | 0x80;
}
else {
input[i] = x & 0x7f;
}
if (x != input[i]) changed = 1;
i++;
}
*rval = (char *)input;
*rval_len = input_len;
return changed;
}
/* parityZero7bit */
static int msre_fn_parityZero7bit_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i;
int changed = 0;
if (rval == NULL) return -1;
*rval = NULL;
i = 0;
while(i < input_len) {
unsigned char c = input[i];
input[i] &= 0x7f;
if (c != input[i]) changed = 1;
i++;
}
*rval = (char *)input;
*rval_len = input_len;
return changed;
}
/* parityOdd7bit */
static int msre_fn_parityOdd7bit_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i;
int changed = 0;
if (rval == NULL) return -1;
*rval = NULL;
i = 0;
while(i < input_len) {
unsigned int x = input[i];
input[i] ^= input[i] >> 4;
input[i] &= 0xf;
if ((0x6996 >> input[i]) & 1) {
input[i] = x & 0x7f;
}
else {
input[i] = x | 0x80;
}
if (x != input[i]) changed = 1;
i++;
}
*rval = (char *)input;
*rval_len = input_len;
return changed;
}
/* ------------------------------------------------------------------------------ */
/**
@@ -597,6 +692,24 @@ void msre_engine_register_default_tfns(msre_engine *engine) {
msre_fn_normalisePathWin_execute
);
/* parityEven7bit */
msre_engine_tfn_register(engine,
"parityEven7bit",
msre_fn_parityEven7bit_execute
);
/* parityZero7bit */
msre_engine_tfn_register(engine,
"parityZero7bit",
msre_fn_parityZero7bit_execute
);
/* parityOdd7bit */
msre_engine_tfn_register(engine,
"parityOdd7bit",
msre_fn_parityOdd7bit_execute
);
/* removeWhitespace */
msre_engine_tfn_register(engine,
"removeWhitespace",