mirror of
https://github.com/owasp-modsecurity/ModSecurity.git
synced 2025-08-14 05:45:59 +03:00
145 lines
3.8 KiB
C++
145 lines
3.8 KiB
C++
/*
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* ModSecurity, http://www.modsecurity.org/
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* Copyright (c) 2015 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 "actions/set_var.h"
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#include <iostream>
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#include <string>
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#include "modsecurity/assay.h"
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#include "src/rule.h"
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#include "src/macro_expansion.h"
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namespace ModSecurity {
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namespace actions {
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SetVar::SetVar(std::string action)
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: Action(action, RunTimeOnlyIfMatchKind) {
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}
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bool SetVar::init(std::string *error) {
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size_t pos = std::string::npos;
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// Resolv operation
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operation = setToOne;
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pos = action.find("=");
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if (pos != std::string::npos) {
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operation = setOperation;
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}
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pos = action.find("=+");
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if (pos != std::string::npos) {
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operation = sumAndSetOperation;
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}
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pos = action.find("=-");
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if (pos != std::string::npos) {
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operation = substractAndSetOperation;
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}
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// Collection name
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pos = action.find(".");
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if (pos != std::string::npos) {
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collectionName = std::string(action, 0, pos);
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} else {
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error->assign("Missing the collection and/or variable name");
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return false;
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}
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// Variable name
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if (operation == setToOne) {
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variableName = std::string(action, pos + 1, action.length()
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- (pos + 1));
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} else {
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size_t pos2 = action.find("=");
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variableName = std::string(action, pos + 1, pos2 - (pos + 1));
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if (pos2 + 2 > action.length()) {
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error->assign("Something wrong with the input format");
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return false;
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}
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if (operation == setOperation) {
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predicate = std::string(action, pos2 + 1, action.length() - (pos2));
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} else {
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predicate = std::string(action, pos2 + 2, action.length()
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- (pos2 + 1));
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}
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}
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if (collectionName.empty() || variableName.empty()) {
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error->assign("Something wrong with the input format");
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return false;
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}
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return true;
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}
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void SetVar::dump() {
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std::cout << " Operation: " << std::to_string(operation) << std::endl;
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std::cout << "Collection: " << collectionName << std::endl;
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std::cout << " Variable: " << variableName << std::endl;
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std::cout << " Predicate: " << predicate << std::endl;
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}
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bool SetVar::evaluate(Rule *rule, Assay *assay) {
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std::string targetValue;
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variableName = MacroExpansion::expand(variableName, assay);
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int value = 0;
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try {
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std::string *resolvedValue =
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assay->resolve_variable_first(collectionName, variableName);
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if (resolvedValue == NULL) {
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value = 0;
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} else {
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value = stoi(*resolvedValue);
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}
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} catch (...) {
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value = 0;
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}
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int pre = 0;
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try {
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pre = stoi(predicate);
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} catch (...) {
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try {
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pre = stoi(MacroExpansion::expand(predicate, assay));
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} catch (...) {
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pre = 0;
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}
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}
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switch (operation) {
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case setOperation:
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targetValue = MacroExpansion::expand(predicate, assay);
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break;
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case sumAndSetOperation:
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targetValue = std::to_string(value + pre);
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break;
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case substractAndSetOperation:
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targetValue = std::to_string(value - pre);
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break;
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case setToOne:
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targetValue = std::string("1");
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break;
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}
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assay->setCollection(collectionName, variableName, targetValue);
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return true;
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}
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} // namespace actions
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} // namespace ModSecurity
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