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re_tfns.c
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/*
* ModSecurity for Apache 2.x, http://www.modsecurity.org/
* Copyright (c) 2004-2013 Trustwave Holdings, Inc. (http://www.trustwave.com/)
*
* You may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* If any of the files related to licensing are missing or if you have any
* other questions related to licensing please contact Trustwave Holdings, Inc.
* directly using the email address [email protected].
*/
#include <ctype.h>
#include "apr_md5.h"
#include "apr_sha1.h"
#include "apr_base64.h"
#include "msc_unicode.h"
#include "re.h"
#include "msc_util.h"
/* cmdline */
/**
* \brief cmdline transformation function
*
* \param mptmp Pointer to resource pool
* \param input Pointer to input data
* \param input_len Input data length
* \param rval Pointer to decoded buffer
* \param rval_len Decoded buffer length
*
* \retval 0 On failure
* \retval 1 On Success
*/
static int msre_fn_cmdline_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
int space = 0;
unsigned char *s = input;
if (rval == NULL) return -1;
*rval = (char *)input;
/* Check characters */
for ( ; *input; input++ ) {
switch(*input) {
/* remove some characters */
case '"':
case '\'':
case '\\':
case '^':
continue;
/* replace some characters to space (only one) */
case ' ':
case ',':
case ';':
case '\t':
case '\r':
case '\n':
if (!space) {
*s++ = ' ';
space++;
}
break;
case '/':
case '(':
/* remove space before / or ( */
if (space) s--;
space = 0;
*s++ = *input;
break;
/* copy normal characters */
default :
*s++ = tolower(*input);
space = 0;
}
}
*s = 0;
*rval_len = strlen(*rval);
return 1;
}
/* lowercase */
static int msre_fn_lowercase_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) {
int x = input[i];
input[i] = tolower(x);
if (x != input[i]) changed = 1;
i++;
}
*rval = (char *)input;
*rval_len = input_len;
return changed;
}
/* uppercase */
static int msre_fn_uppercase_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) {
int x = input[i];
input[i] = toupper(x);
if (x != input[i]) changed = 1;
i++;
}
*rval = (char *)input;
*rval_len = input_len;
return changed;
}
/* trimLeft */
static int msre_fn_trimLeft_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i;
*rval = (char *)input;
for (i = 0; i < input_len; i++) {
if (isspace(**rval) == 0) {
break;
}
(*rval)++;
}
*rval_len = input_len - i;
return (*rval_len == input_len ? 0 : 1);
}
/* trimRight */
static int msre_fn_trimRight_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i;
*rval = (char *)input;
for (i = input_len - 1; i >= 0; i--) {
if (isspace((*rval)[i]) == 0) {
break;
}
(*rval)[i] = '\0';
}
*rval_len = i + 1;
return (*rval_len == input_len ? 0 : 1);
}
/* trim */
static int msre_fn_trim_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
int rc = 0;
rc = msre_fn_trimLeft_execute(mptmp, input, input_len, rval, rval_len);
if (rc == 1) {
rc = msre_fn_trimRight_execute(mptmp, (unsigned char *)*rval, *rval_len, rval, rval_len);
}
else {
rc = msre_fn_trimRight_execute(mptmp, input, input_len, rval, rval_len);
}
return (*rval_len == input_len ? 0 : 1);
}
/* removeNulls */
static int msre_fn_removeNulls_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i, j;
int changed = 0;
i = j = 0;
while(i < input_len) {
if (input[i] == '\0') {
changed = 1;
} else {
input[j] = input[i];
j++;
}
i++;
}
*rval = (char *)input;
*rval_len = j;
return changed;
}
/* replaceNulls */
static int msre_fn_replaceNulls_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) {
if (input[i] == '\0') {
changed = 1;
input[i] = ' ';
}
i++;
}
*rval = (char *)input;
*rval_len = input_len;
return changed;
}
/* compressWhitespace */
static int msre_fn_compressWhitespace_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i, j, count;
int changed = 0;
int inwhitespace = 0;
i = j = count = 0;
while(i < input_len) {
if (isspace(input[i])||(input[i] == NBSP)) {
if (inwhitespace) changed = 1;
inwhitespace = 1;
count++;
} else {
inwhitespace = 0;
if (count) {
input[j] = ' ';
count = 0;
j++;
}
input[j] = input[i];
j++;
}
i++;
}
if (count) {
input[j] = ' ';
j++;
}
*rval = (char *)input;
*rval_len = j;
return changed;
}
/* cssDecode */
static int msre_fn_cssDecode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int length;
length = css_decode_inplace(input, input_len);
*rval = (char *)input;
*rval_len = length;
return (*rval_len == input_len ? 0 : 1);
}
/* removeWhitespace */
static int msre_fn_removeWhitespace_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i, j;
int changed = 0;
i = j = 0;
while(i < input_len) {
if (isspace(input[i])||(input[i] == NBSP)) {
/* do nothing */
changed = 1;
} else {
input[j] = input[i];
j++;
}
i++;
}
*rval = (char *)input;
*rval_len = j;
return changed;
}
/* removeCommentsChar */
static int msre_fn_removeCommentsChar_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i, j;
int changed = 0;
i = j = 0;
while(i < input_len) {
if ((input[i] == '/')&&(i + 1 < input_len)&&(input[i + 1] == '*')) {
changed = 1;
i += 2;
} else if ((input[i] == '*')&&(i + 1 < input_len)&&(input[i + 1] == '/')) {
changed = 1;
i += 2;
} else if ((input[i] == '<')&&(i + 1 < input_len)&&(input[i + 1] == '!')&&
(i + 2 < input_len)&&(input[i+2] == '-')&&(i + 3 < input_len)&&
(input[i + 3] == '-')) {
changed = 1;
i += 4;
} else if ((input[i] == '-')&&(i + 1 < input_len)&&(input[i + 1] == '-')&&
(i + 2 < input_len)&&(input[i+2] == '>')) {
changed = 1;
i += 3;
} else if ((input[i] == '-')&&(i + 1 < input_len)&&(input[i + 1] == '-')) {
changed = 1;
i += 2;
} else if (input[i] == '#') {
changed = 1;
i++;
} else {
input[j] = input[i];
i++;
j++;
}
}
input[j] = '\0';
*rval = (char *)input;
*rval_len = j;
return changed;
}
/* removeComments */
static int msre_fn_removeComments_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i, j, incomment;
int changed = 0;
i = j = incomment = 0;
while(i < input_len) {
if (incomment == 0) {
if ((input[i] == '/')&&(i + 1 < input_len)&&(input[i + 1] == '*')) {
changed = 1;
incomment = 1;
i += 2;
} else if ((input[i] == '<')&&(i + 1 < input_len)&&(input[i + 1] == '!')&&
(i + 2 < input_len)&&(input[i+2] == '-')&&(i + 3 < input_len)&&
(input[i + 3] == '-') && (incomment == 0)) {
incomment = 1;
changed = 1;
i += 4;
} else if ((input[i] == '-')&&(i + 1 < input_len)&&(input[i + 1] == '-')
&& (incomment == 0)) {
changed = 1;
input[i] = ' ';
break;
} else if (input[i] == '#' && (incomment == 0)) {
changed = 1;
input[i] = ' ';
break;
} else {
input[j] = input[i];
i++;
j++;
}
} else {
if ((input[i] == '*')&&(i + 1 < input_len)&&(input[i + 1] == '/')) {
incomment = 0;
i += 2;
input[j] = input[i];
i++;
j++;
} else if ((input[i] == '-')&&(i + 1 < input_len)&&(input[i + 1] == '-')&&
(i + 2 < input_len)&&(input[i+2] == '>')) {
incomment = 0;
i += 3;
input[j] = input[i];
i++;
j++;
} else {
i++;
}
}
}
if (incomment) {
input[j++] = ' ';
}
*rval = (char *)input;
*rval_len = j;
return changed;
}
/* replaceComments */
static int msre_fn_replaceComments_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int i, j, incomment;
int changed = 0;
i = j = incomment = 0;
while(i < input_len) {
if (incomment == 0) {
if ((input[i] == '/')&&(i + 1 < input_len)&&(input[i + 1] == '*')) {
changed = 1;
incomment = 1;
i += 2;
} else {
input[j] = input[i];
i++;
j++;
}
} else {
if ((input[i] == '*')&&(i + 1 < input_len)&&(input[i + 1] == '/')) {
incomment = 0;
i += 2;
input[j] = ' ';
j++;
} else {
i++;
}
}
}
if (incomment) {
input[j++] = ' ';
}
*rval = (char *)input;
*rval_len = j;
return changed;
}
/* jsDecode */
static int msre_fn_jsDecode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int length;
length = js_decode_nonstrict_inplace(input, input_len);
*rval = (char *)input;
*rval_len = length;
return (*rval_len == input_len ? 0 : 1);
}
/* urlDecode */
static int msre_fn_urlDecode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int length;
int invalid_count;
int changed;
length = urldecode_nonstrict_inplace_ex(input, input_len, &invalid_count, &changed);
*rval = (char *)input;
*rval_len = length;
return changed;
}
/* urlDecodeUni */
static int msre_fn_urlDecodeUni_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
long int length;
int changed;
length = urldecode_uni_nonstrict_inplace_ex(input, input_len, &changed);
*rval = (char *)input;
*rval_len = length;
return changed;
}
static int msre_fn_utf8Unicode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
int changed = 0;
*rval = (char *)utf8_unicode_inplace_ex(mptmp, input, input_len, &changed);
*rval_len = strlen(*rval);
return changed;
}
/* urlEncode */
static int msre_fn_urlEncode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
int changed;
*rval = url_encode(mptmp, (char *)input, input_len, &changed);
*rval_len = strlen(*rval);
return changed;
}
/* base64Encode */
static int msre_fn_base64Encode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval_len = apr_base64_encode_len(input_len); /* returns len with NULL byte included */
*rval = apr_palloc(mptmp, *rval_len);
apr_base64_encode(*rval, (const char *)input, input_len);
(*rval_len)--;
return *rval_len ? 1 : 0;
}
/* base64Decode */
static int msre_fn_base64Decode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval_len = apr_base64_decode_len((const char *)input); /* returns len with NULL byte included */
*rval = apr_palloc(mptmp, *rval_len);
*rval_len = apr_base64_decode(*rval, (const char *)input);
return *rval_len ? 1 : 0;
}
/* length */
static int msre_fn_length_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval = apr_psprintf(mptmp, "%ld", input_len);
*rval_len = strlen(*rval);
return 1;
}
/* md5 */
static int msre_fn_md5_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
unsigned char digest[APR_MD5_DIGESTSIZE];
apr_md5(digest, input, input_len);
*rval_len = APR_MD5_DIGESTSIZE;
*rval = apr_pstrmemdup(mptmp, (const char *)digest, APR_MD5_DIGESTSIZE);
return 1;
}
/* sha1 */
static int msre_fn_sha1_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
unsigned char digest[APR_SHA1_DIGESTSIZE];
apr_sha1_ctx_t context;
apr_sha1_init(&context);
apr_sha1_update(&context, (const char *)input, input_len);
apr_sha1_final(digest, &context);
*rval_len = APR_SHA1_DIGESTSIZE;
*rval = apr_pstrmemdup(mptmp, (const char *)digest, APR_SHA1_DIGESTSIZE);
return 1;
}
/**
* \brief SqlHexDecode transformation function. Transform xNN data.
*
* \param mptmp Pointer to resource pool
* \param input Pointer to input data
* \param input_len Input data length
* \param rval Pointer to decoded buffer
* \param rval_len Decoded buffer length
*
* \retval 0 On failure
* \retval 1 On Success
*/
static int msre_fn_sqlHexDecode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval_len = sql_hex2bytes_inplace(input, input_len);
*rval = (char *)input;
return 1;
}
/* hexDecode */
static int msre_fn_hexDecode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval_len = hex2bytes_inplace(input, input_len);
*rval = (char *)input;
return 1;
}
/* hexEncode */
static int msre_fn_hexEncode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval = bytes2hex(mptmp, input, input_len);
*rval_len = strlen(*rval);
return 1;
}
/* htmlEntityDecode */
static int msre_fn_htmlEntityDecode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval_len = html_entities_decode_inplace(mptmp, input, input_len);
*rval = (char *)input;
return (*rval_len == input_len ? 0 : 1);
}
/* escapeSeqDecode */
static int msre_fn_escapeSeqDecode_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
*rval_len = ansi_c_sequences_decode_inplace(input, input_len);
*rval = (char *)input;
return (*rval_len == input_len ? 0 : 1);
}
/* normalizePath */
static int msre_fn_normalizePath_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
int changed;
*rval_len = normalize_path_inplace(input, input_len, 0, &changed);
*rval = (char *)input;
return changed;
}
/* normalizePathWin */
static int msre_fn_normalizePathWin_execute(apr_pool_t *mptmp, unsigned char *input,
long int input_len, char **rval, long int *rval_len)
{
int changed;
*rval_len = normalize_path_inplace(input, input_len, 1, &changed);
*rval = (char *)input;
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;
}
/**
* \brief Base64 transformation function based on RFC2045
*
* \param mptmp Pointer to resource pool
* \param input Pointer to input data
* \param input_len Input data length
* \param rval Pointer to decoded buffer
* \param rval_len Decoded buffer length
*
* \retval 0 On failure
* \retval 1 On Success
*/
static int msre_fn_base64DecodeExt_execute(apr_pool_t *mptmp, unsigned char *input, long int input_len, char **rval, long int *rval_len)
{
*rval_len = input_len;
*rval = apr_palloc(mptmp, *rval_len);
*rval_len = decode_base64_ext(*rval, (const unsigned char *)input, input_len);
return *rval_len ? 1 : 0;
}
/* ------------------------------------------------------------------------------ */
/**
* Registers one transformation function with the engine.
*/
void msre_engine_tfn_register(msre_engine *engine, const char *name,
fn_tfn_execute_t execute)
{
msre_tfn_metadata *metadata = (msre_tfn_metadata *)apr_pcalloc(engine->mp,
sizeof(msre_tfn_metadata));
if (metadata == NULL) return;
metadata->name = name;
metadata->execute = execute;
apr_table_setn(engine->tfns, name, (void *)metadata);
}
/**
* Returns transformation function metadata given a name.
*/
msre_tfn_metadata *msre_engine_tfn_resolve(msre_engine *engine, const char *name) {
return (msre_tfn_metadata *)apr_table_get(engine->tfns, name);
}
/**
* Register the default transformation functions.
*/
void msre_engine_register_default_tfns(msre_engine *engine) {
/* none */
msre_engine_tfn_register(engine,
"none",
NULL
);
/* base64Decode */
msre_engine_tfn_register(engine,
"base64Decode",
msre_fn_base64Decode_execute
);
/* base64Encode */
msre_engine_tfn_register(engine,
"base64Encode",
msre_fn_base64Encode_execute
);
/* compressWhitespace */
msre_engine_tfn_register(engine,
"compressWhitespace",
msre_fn_compressWhitespace_execute
);
/* cssDecode */
msre_engine_tfn_register(engine,
"cssDecode",
msre_fn_cssDecode_execute
);
/* escapeSeqDecode */
msre_engine_tfn_register(engine,
"escapeSeqDecode",
msre_fn_escapeSeqDecode_execute
);
/* sqlHexDecode */
msre_engine_tfn_register(engine,
"sqlHexDecode",
msre_fn_sqlHexDecode_execute
);
/* hexDecode */
msre_engine_tfn_register(engine,
"hexDecode",
msre_fn_hexDecode_execute
);
/* hexEncode */
msre_engine_tfn_register(engine,
"hexEncode",
msre_fn_hexEncode_execute
);
/* htmlEntityDecode */
msre_engine_tfn_register(engine,
"htmlEntityDecode",
msre_fn_htmlEntityDecode_execute
);
/* jsDecode */
msre_engine_tfn_register(engine,
"jsDecode",
msre_fn_jsDecode_execute
);
/* length */
msre_engine_tfn_register(engine,
"length",
msre_fn_length_execute
);
/* lowercase */
msre_engine_tfn_register(engine,
"lowercase",
msre_fn_lowercase_execute
);
/* uppercase */
msre_engine_tfn_register(engine,
"uppercase",
msre_fn_uppercase_execute
);
/* md5 */
msre_engine_tfn_register(engine,
"md5",
msre_fn_md5_execute
);
/* normalisePath */
msre_engine_tfn_register(engine,
"normalisePath",
msre_fn_normalizePath_execute
);
/* normalizePath */
msre_engine_tfn_register(engine,
"normalizePath",
msre_fn_normalizePath_execute
);
/* normalisePathWin */
msre_engine_tfn_register(engine,
"normalisePathWin",
msre_fn_normalizePathWin_execute
);
/* normalizePathWin */
msre_engine_tfn_register(engine,
"normalizePathWin",
msre_fn_normalizePathWin_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",
msre_fn_removeWhitespace_execute
);
/* removeNulls */
msre_engine_tfn_register(engine,
"removeNulls",
msre_fn_removeNulls_execute
);
/* replaceNulls */
msre_engine_tfn_register(engine,