mirror of
https://github.com/owasp-modsecurity/ModSecurity.git
synced 2025-08-15 23:55:03 +03:00
112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
/*
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* ModSecurity, http://www.modsecurity.org/
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* Copyright (c) 2015 - 2020 Trustwave Holdings, Inc. (http://www.trustwave.com/)
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*
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* You may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* If any of the files related to licensing are missing or if you have any
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* other questions related to licensing please contact Trustwave Holdings, Inc.
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* directly using the email address security@modsecurity.org.
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*
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*/
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#include "src/actions/transformations/sql_hex_decode.h"
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#include <iostream>
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#include <string>
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#include <algorithm>
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#include <functional>
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#include <cctype>
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#include <locale>
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#include <cstring>
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#include "modsecurity/transaction.h"
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#include "src/actions/transformations/transformation.h"
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#include "src/utils/string.h"
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namespace modsecurity {
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namespace actions {
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namespace transformations {
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#ifndef VALID_HEX
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#define VALID_HEX(X) (((X >= '0') && (X <= '9')) \
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|| ((X >= 'a') && (X <= 'f')) \
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|| ((X >= 'A') && (X <= 'F')))
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#endif
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#ifndef ISODIGIT
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#define ISODIGIT(X) ((X >= '0') && (X <= '7'))
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#endif
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void SqlHexDecode::execute(Transaction *t,
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ModSecString &in,
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ModSecString &out) {
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unsigned char *input;
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int size = 0;
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input = reinterpret_cast<unsigned char *>
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(malloc(sizeof(char) * in.length()+1));
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if (input == NULL) {
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return;
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}
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memcpy(input, in.c_str(), in.length()+1);
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size = inplace(input, in.length());
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out.assign(reinterpret_cast<char *>(input), size);
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free(input);
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}
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int SqlHexDecode::inplace(unsigned char *data, int len) {
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unsigned char *d, *begin = data;
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int count = 0;
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if ((data == NULL) || (len == 0)) {
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return 0;
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}
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for (d = data; (++count < len) && *data; *d++ = *data++) {
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if (*data != '0') {
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continue;
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}
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++data;
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++count;
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if (mytolower(*data) != 'x') {
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data--;
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count--;
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continue;
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}
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data++;
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++count;
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// Do we need to keep "0x" if no hexa after?
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if (!VALID_HEX(data[0]) || !VALID_HEX(data[1])) {
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data -= 2;
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count -= 2;
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continue;
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}
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while (VALID_HEX(data[0]) && VALID_HEX(data[1])) {
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*d++ = utils::string::x2c(data);
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data += 2;
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count += 2;
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}
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}
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*d = '\0';
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return strlen(reinterpret_cast<char *>(begin));
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}
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} // namespace transformations
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} // namespace actions
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} // namespace modsecurity
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