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transaction.cc
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/*
* ModSecurity, http://www.modsecurity.org/
* Copyright (c) 2015 - 2021 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 "modsecurity/transaction.h"
#ifdef WITH_YAJL
#include <yajl/yajl_tree.h>
#include <yajl/yajl_gen.h>
#endif
#include <stdio.h>
#include <string.h>
#include <cstdio>
#include <ctime>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <set>
#include <unordered_map>
#include <vector>
#include "modsecurity/actions/action.h"
#include "src/actions/disruptive/deny.h"
#include "modsecurity/intervention.h"
#include "modsecurity/modsecurity.h"
#include "src/request_body_processor/multipart.h"
#include "src/request_body_processor/xml.h"
#ifdef WITH_YAJL
#include "src/request_body_processor/json.h"
#endif
#include "modsecurity/audit_log.h"
#include "src/unique_id.h"
#include "src/utils/string.h"
#include "src/utils/system.h"
#include "src/utils/decode.h"
#include "src/utils/random.h"
#include "modsecurity/rule.h"
#include "modsecurity/rule_message.h"
#include "modsecurity/rules_set_properties.h"
#include "src/actions/disruptive/allow.h"
#include "src/variables/remote_user.h"
using modsecurity::actions::Action;
using modsecurity::RequestBodyProcessor::Multipart;
using modsecurity::RequestBodyProcessor::XML;
namespace modsecurity {
/**
* @name Transaction
* @brief Represents the inspection on an entire request.
*
* An instance of the Transaction class represents an entire request, on its
* different phases.
*
* @param ms ModSecurity core instance.
* @param rules Rules instance.
*
* Example Usage:
* @code
*
* using ModSecurity::ModSecurity;
* using ModSecurity::Rules;
* using ModSecurity::Transaction;
*
* ModSecurity *modsec;
* ModSecurity::Rules *rules;
*
* modsec = new ModSecurity();
* rules = new Rules();
* rules->loadFromUri(rules_file);
*
* Transaction *modsecTransaction = new Transaction(modsec, rules);
* modsecTransaction->processConnection("127.0.0.1", 33333, "127.0.0.1", 8080);
*
* if (modsecTransaction->intervention()) {
* std::cout << "There is an intervention" << std::endl;
* }
*
* ...
*
* delete modsecTransaction;
*
* @endcode
*
*/
Transaction::Transaction(ModSecurity *ms, RulesSet *rules, void *logCbData)
: m_creationTimeStamp(utils::cpu_seconds()),
/* m_clientIpAddress(nullptr), */
m_httpVersion(""),
/* m_serverIpAddress(""), */
m_uri(""),
/* m_uri_no_query_string_decoded(""), */
m_ARGScombinedSizeDouble(0),
m_clientPort(0),
m_highestSeverityAction(255),
m_httpCodeReturned(200),
m_serverPort(0),
m_ms(ms),
m_requestBodyType(UnknownFormat),
m_requestBodyProcessor(UnknownFormat),
m_rules(rules),
m_ruleRemoveById(),
m_ruleRemoveByIdRange(),
m_ruleRemoveByTag(),
m_ruleRemoveTargetByTag(),
m_ruleRemoveTargetById(),
m_requestBodyAccess(RulesSet::PropertyNotSetConfigBoolean),
m_auditLogModifier(),
m_ctlAuditEngine(AuditLog::AuditLogStatus::NotSetLogStatus),
m_rulesMessages(),
m_requestBody(),
m_responseBody(),
/* m_id(), */
m_skip_next(0),
m_allowType(modsecurity::actions::disruptive::NoneAllowType),
m_uri_decoded(""),
m_actions(),
m_it(),
m_timeStamp(std::time(NULL)),
m_collections(ms->m_global_collection, ms->m_ip_collection,
ms->m_session_collection, ms->m_user_collection,
ms->m_resource_collection),
m_matched(),
#ifdef WITH_LIBXML2
m_xml(new RequestBodyProcessor::XML(this)),
#else
m_xml(NULL),
#endif
#ifdef WITH_YAJL
m_json(new RequestBodyProcessor::JSON(this)),
#else
m_json(NULL),
#endif
m_secRuleEngine(RulesSetProperties::PropertyNotSetRuleEngine),
m_variableDuration(""),
m_variableEnvs(),
m_variableHighestSeverityAction(""),
m_variableRemoteUser(""),
m_variableTime(""),
m_variableTimeDay(""),
m_variableTimeEpoch(""),
m_variableTimeHour(""),
m_variableTimeMin(""),
m_variableTimeSec(""),
m_variableTimeWDay(""),
m_variableTimeYear(""),
m_logCbData(logCbData),
TransactionAnchoredVariables(this) {
m_id = std::unique_ptr<std::string>(
new std::string(
std::to_string(m_timeStamp)));
m_variableUrlEncodedError.set("0", 0);
ms_dbg(4, "Initializing transaction");
intervention::clean(&m_it);
}
Transaction::Transaction(ModSecurity *ms, RulesSet *rules, char *id, void *logCbData)
: m_creationTimeStamp(utils::cpu_seconds()),
/* m_clientIpAddress(""), */
m_httpVersion(""),
/* m_serverIpAddress(""), */
m_uri(""),
/* m_uri_no_query_string_decoded(""), */
m_ARGScombinedSizeDouble(0),
m_clientPort(0),
m_highestSeverityAction(255),
m_httpCodeReturned(200),
m_serverPort(0),
m_ms(ms),
m_requestBodyType(UnknownFormat),
m_requestBodyProcessor(UnknownFormat),
m_rules(rules),
m_ruleRemoveById(),
m_ruleRemoveByIdRange(),
m_ruleRemoveByTag(),
m_ruleRemoveTargetByTag(),
m_ruleRemoveTargetById(),
m_requestBodyAccess(RulesSet::PropertyNotSetConfigBoolean),
m_auditLogModifier(),
m_ctlAuditEngine(AuditLog::AuditLogStatus::NotSetLogStatus),
m_rulesMessages(),
m_requestBody(),
m_responseBody(),
m_id(std::unique_ptr<std::string>(new std::string(id))),
m_skip_next(0),
m_allowType(modsecurity::actions::disruptive::NoneAllowType),
m_uri_decoded(""),
m_actions(),
m_it(),
m_timeStamp(std::time(NULL)),
m_collections(ms->m_global_collection, ms->m_ip_collection,
ms->m_session_collection, ms->m_user_collection,
ms->m_resource_collection),
m_matched(),
#ifdef WITH_LIBXML2
m_xml(new RequestBodyProcessor::XML(this)),
#else
m_xml(NULL),
#endif
#ifdef WITH_YAJL
m_json(new RequestBodyProcessor::JSON(this)),
#else
m_json(NULL),
#endif
m_secRuleEngine(RulesSetProperties::PropertyNotSetRuleEngine),
m_variableDuration(""),
m_variableEnvs(),
m_variableHighestSeverityAction(""),
m_variableRemoteUser(""),
m_variableTime(""),
m_variableTimeDay(""),
m_variableTimeEpoch(""),
m_variableTimeHour(""),
m_variableTimeMin(""),
m_variableTimeSec(""),
m_variableTimeWDay(""),
m_variableTimeYear(""),
m_logCbData(logCbData),
TransactionAnchoredVariables(this) {
m_variableUrlEncodedError.set("0", 0);
ms_dbg(4, "Initializing transaction");
intervention::clean(&m_it);
}
Transaction::~Transaction() {
m_responseBody.str(std::string());
m_responseBody.clear();
m_requestBody.str(std::string());
m_requestBody.clear();
m_rulesMessages.clear();
intervention::free(&m_it);
intervention::clean(&m_it);
#ifdef WITH_YAJL
delete m_json;
#endif
#ifdef WITH_LIBXML2
delete m_xml;
#endif
}
/**
* @name debug
* @brief Prints a message on the debug logs.
*
* Debug logs are important during the rules creation phase, this method can be
* used to print message on this debug log.
*
* @param level Debug level, current supported from 0 to 9.
* @param message Message to be logged.
*
*/
#ifndef NO_LOGS
void Transaction::debug(int level, std::string message) const {
if (m_rules == NULL) {
return;
}
m_rules->debug(level, *m_id.get(), m_uri, message);
}
#endif
/**
* @name processConnection
* @brief Perform the analysis on the connection.
*
* This method should be called at very beginning of a request process, it is
* expected to be executed prior to the virtual host resolution, when the
* connection arrives on the server.
*
* @note Remember to check for a possible intervention.
*
* @param transaction ModSecurity Transaction.
* @param client Client's IP address in text format.
* @param cPort Client's port
* @param server Server's IP address in text format.
* @param sPort Server's port
*
* @returns If the operation was successful or not.
* @retval true Operation was successful.
* @retval false Operation failed.
*
*/
int Transaction::processConnection(const char *client, int cPort,
const char *server, int sPort) {
m_clientIpAddress = std::unique_ptr<std::string>(new std::string(client));
m_serverIpAddress = std::unique_ptr<std::string>(new std::string(server));
this->m_clientPort = cPort;
this->m_serverPort = sPort;
ms_dbg(4, "Transaction context created.");
ms_dbg(4, "Starting phase CONNECTION. (SecRules 0)");
m_variableRemoteHost.set(*m_clientIpAddress.get(), m_variableOffset);
m_variableUniqueID.set(*m_id.get(), m_variableOffset);
m_variableRemoteAddr.set(*m_clientIpAddress.get(), m_variableOffset);
m_variableServerAddr.set(*m_serverIpAddress.get(), m_variableOffset);
m_variableServerPort.set(std::to_string(this->m_serverPort),
m_variableOffset);
m_variableRemotePort.set(std::to_string(this->m_clientPort),
m_variableOffset);
this->m_rules->evaluate(modsecurity::ConnectionPhase, this);
return true;
}
bool Transaction::extractArguments(const std::string &orig,
const std::string& buf, size_t offset) {
char sep1 = '&';
if (m_rules->m_secArgumentSeparator.m_set) {
sep1 = m_rules->m_secArgumentSeparator.m_value.at(0);
}
std::vector<std::string> key_value_sets = utils::string::ssplit(buf, sep1);
for (std::string t : key_value_sets) {
char sep2 = '=';
size_t key_s = 0;
size_t value_s = 0;
int invalid = 0;
int changed = 0;
std::string key;
std::string value;
std::pair<std::string, std::string> key_value_pair = utils::string::ssplit_pair(t, sep2);
key = key_value_pair.first;
value = key_value_pair.second;
key_s = (key.length() + 1);
value_s = (value.length() + 1);
unsigned char *key_c = reinterpret_cast<unsigned char *>(
calloc(sizeof(char), key_s));
unsigned char *value_c = reinterpret_cast<unsigned char *>(
calloc(sizeof(char), value_s));
memcpy(key_c, key.c_str(), key_s);
memcpy(value_c, value.c_str(), value_s);
key_s = utils::urldecode_nonstrict_inplace(key_c, key_s,
&invalid, &changed);
value_s = utils::urldecode_nonstrict_inplace(value_c, value_s,
&invalid, &changed);
if (invalid) {
m_variableUrlEncodedError.set("1", m_variableOffset);
}
addArgument(orig, std::string(reinterpret_cast<char *>(key_c), key_s-1),
std::string(reinterpret_cast<char *>(value_c), value_s-1), offset);
offset = offset + t.size() + 1;
free(key_c);
free(value_c);
}
return true;
}
bool Transaction::addArgument(const std::string& orig, const std::string& key,
const std::string& value, size_t offset) {
ms_dbg(4, "Adding request argument (" + orig + "): name \"" + \
key + "\", value \"" + value + "\"");
if (m_rules->m_argumentsLimit.m_set
&& m_variableArgs.size() >= m_rules->m_argumentsLimit.m_value) {
ms_dbg(4, "Skipping request argument, over limit (" + std::to_string(m_rules->m_argumentsLimit.m_value) + ")")
return false;
}
offset = offset + key.size() + 1;
m_variableArgs.set(key, value, offset);
if (orig == "GET") {
m_variableArgsGet.set(key, value, offset);
} else if (orig == "POST") {
m_variableArgsPost.set(key, value, offset);
}
m_ARGScombinedSizeDouble = m_ARGScombinedSizeDouble + \
key.length() + value.length();
m_variableARGScombinedSize.set(std::to_string(m_ARGScombinedSizeDouble),
offset - key.size() - 1, key.size());
m_variableARGScombinedSize.set(std::to_string(m_ARGScombinedSizeDouble),
offset, value.length());
return true;
}
/**
* @name processURI
* @brief Perform the analysis on the URI and all the query string variables.
*
* This method should be called at very beginning of a request process, it is
* expected to be executed prior to the virtual host resolution, when the
* connection arrives on the server.
*
* @note There is no direct connection between this function and any phase of
* the SecLanguage's phases. It is something that may occur between the
* SecLanguage phase 1 and 2.
* @note Remember to check for a possible intervention.
*
* @param transaction ModSecurity transaction.
* @param uri Uri.
* @param method Method (GET, POST, PUT).
* @param http_version Http version (1.0, 1.1, 2.0).
*
* @returns If the operation was successful or not.
* @retval true Operation was successful.
* @retval false Operation failed.
*
*/
int Transaction::processURI(const char *uri, const char *method,
const char *http_version) {
ms_dbg(4, "Starting phase URI. (SecRules 0 + 1/2)");
m_httpVersion = http_version;
m_uri = uri;
std::string uri_s(uri);
// any uri-fragment that was received should only be retained in
// - m_uri
// - m_variableRequestURIRaw
// - m_variableRequestLine
size_t pos_raw_fragment = uri_s.find("#");
if (pos_raw_fragment != std::string::npos) {
uri_s = uri_s.substr(0, pos_raw_fragment);
}
size_t pos_raw_query = uri_s.find("?");
m_uri_decoded = utils::uri_decode(uri_s);
size_t var_size = pos_raw_query;
m_variableRequestMethod.set(method, 0);
std::string requestLine(std::string(method) + " " + std::string(uri));
m_variableRequestLine.set(requestLine \
+ " HTTP/" + std::string(http_version), m_variableOffset);
m_variableRequestProtocol.set("HTTP/" + std::string(http_version),
m_variableOffset + requestLine.size() + 1);
size_t pos_query = m_uri_decoded.find("?");
if (pos_query != std::string::npos) {
m_uri_no_query_string_decoded = std::unique_ptr<std::string>(
new std::string(m_uri_decoded, 0, pos_query));
} else {
m_uri_no_query_string_decoded = std::unique_ptr<std::string>(
new std::string(m_uri_decoded));
}
if (pos_raw_query != std::string::npos) {
std::string qry = std::string(uri_s, pos_raw_query + 1,
uri_s.length() - (pos_raw_query + 1));
m_variableQueryString.set(qry, pos_raw_query + 1
+ std::string(method).size() + 1);
}
std::string path_info;
if (pos_query == std::string::npos) {
path_info = std::string(m_uri_decoded, 0);
} else {
path_info = std::string(m_uri_decoded, 0, pos_query);
}
if (var_size == std::string::npos) {
var_size = uri_s.size();
}
m_variablePathInfo.set(path_info, m_variableOffset + strlen(method) +
1, var_size);
m_variableRequestFilename.set(path_info, m_variableOffset +
strlen(method) + 1, var_size);
size_t offset = path_info.find_last_of("/\\");
if (offset != std::string::npos && path_info.length() > offset + 1) {
std::string basename = std::string(path_info, offset + 1,
path_info.length() - (offset + 1));
m_variableRequestBasename.set(basename, m_variableOffset +
strlen(method) + 1 + offset + 1);
}
m_variableOffset = m_variableRequestLine.m_value.size();
std::string parsedURI = m_uri_decoded;
// The more popular case is without domain
if (!m_uri_decoded.empty() && m_uri_decoded.at(0) != '/') {
bool fullDomain = true;
size_t scheme = m_uri_decoded.find(":")+1;
if (scheme == std::string::npos) { //impossible case, for +1 in size_t scheme = m_uri_decoded.find(":")+1
fullDomain = false;
}
// Searching with a pos of -1 is undefined we also shortcut
if (scheme != std::string::npos && fullDomain == true) {
// Assuming we found a colon make sure its followed
size_t netloc = m_uri_decoded.find("//", scheme) + 2;//
if (netloc == std::string::npos || (netloc != scheme + 2)) { //(netloc == std::string::npos) will be false forever, for +2 in size_t netloc = m_uri_decoded.find("//", scheme) + 2
fullDomain = false;
}
if (netloc != std::string::npos && fullDomain == true) {
size_t path = m_uri_decoded.find("/", netloc);
if (path != std::string::npos) {
parsedURI = m_uri_decoded.substr(path);
}
}
}
}
m_variableRequestURI.set(parsedURI, std::string(method).size() + 1,
uri_s.size());
m_variableRequestURIRaw.set(uri, std::string(method).size() + 1);
if (m_variableQueryString.m_value.empty() == false) {
extractArguments("GET", m_variableQueryString.m_value,
m_variableQueryString.m_offset);
}
m_variableOffset = m_variableOffset + 1;
return true;
}
/**
* @name processRequestHeaders
* @brief Perform the analysis on the request readers.
*
* This method perform the analysis on the request headers, notice however
* that the headers should be added prior to the execution of this function.
*
* @note Remember to check for a possible intervention.
*
* @returns If the operation was successful or not.
* @retval true Operation was successful.
* @retval false Operation failed.
*
*/
int Transaction::processRequestHeaders() {
ms_dbg(4, "Starting phase REQUEST_HEADERS. (SecRules 1)");
if (getRuleEngineState() == RulesSet::DisabledRuleEngine) {
ms_dbg(4, "Rule engine disabled, returning...");
return true;
}
this->m_rules->evaluate(modsecurity::RequestHeadersPhase, this);
return true;
}
/**
* @name addRequestHeader
* @brief Adds a request header
*
* With this method it is possible to feed ModSecurity with a request header.
*
* @note This function expects a NULL terminated string, for both: key and
* value.
*
* @param key header name.
* @param value header value.
*
* @returns If the operation was successful or not.
* @retval true Operation was successful.
* @retval false Operation failed.
*
*/
int Transaction::addRequestHeader(const std::string& key,
const std::string& value) {
m_variableRequestHeadersNames.set(key, key, m_variableOffset);
m_variableOffset = m_variableOffset + key.size() + 2;
m_variableRequestHeaders.set(key, value, m_variableOffset);
std::string keyl = utils::string::tolower(key);
if (keyl == "authorization") {
std::vector<std::string> type = utils::string::split(value, ' ');
m_variableAuthType.set(type[0], m_variableOffset);
}
if (keyl == "cookie") {
size_t localOffset = m_variableOffset;
size_t pos;
std::vector<std::string> cookies = utils::string::ssplit(value, ';');
if (!cookies.empty()) {
// Get rid of any optional whitespace after the cookie-string
// (i.e. after the end of the final cookie-pair)
std::string& final_cookie_pair = cookies.back();
while (!final_cookie_pair.empty() && isspace(final_cookie_pair.back())) {
final_cookie_pair.pop_back();
}
}
for (const std::string &c : cookies) {
// skip empty substring, eg "Cookie: ;;foo=bar"
if (c.empty() == true) {
localOffset++; // add length of ';'
continue;
}
// find the first '='
pos = c.find_first_of("=", 0);
std::string ckey = "";
std::string cval = "";
// if the cookie doesn't contains '=', its just a key
if (pos == std::string::npos) {
ckey = c;
}
// else split to two substrings by first =
else {
ckey = c.substr(0, pos);
// value will contains the next '=' chars if exists
// eg. foo=bar=baz -> key: foo, value: bar=baz
cval = c.substr(pos+1);
}
// ltrim the key - following the modsec v2 way
while (ckey.empty() == false && isspace(ckey.at(0))) {
ckey.erase(0, 1);
localOffset++;
}
// if the key is empty (eg: "Cookie: =bar;") skip it
if (ckey.empty() == true) {
localOffset = localOffset + c.length() + 1;
continue;
}
else {
// handle cookie only if the key is not empty
// set cookie name
m_variableRequestCookiesNames.set(ckey,
ckey, localOffset);
localOffset = localOffset + ckey.size() + 1;
// set cookie value
m_variableRequestCookies.set(ckey, cval,
localOffset);
localOffset = localOffset + cval.size() + 1;
}
}
}
/**
* Simple check to decide the request body content. This is not the right
* place, the "body processor" should be able to tell what he is capable
* to deal with.
*
*/
if (keyl == "content-type") {
std::string multipart("multipart/form-data");
std::string urlencoded("application/x-www-form-urlencoded");
std::string l = utils::string::tolower(value);
if (l.compare(0, multipart.length(), multipart) == 0) {
this->m_requestBodyType = MultiPartRequestBody;
m_variableReqbodyProcessor.set("MULTIPART", m_variableOffset);
}
if (l.compare(0, urlencoded.length(), urlencoded) == 0) {
this->m_requestBodyType = WWWFormUrlEncoded;
m_variableReqbodyProcessor.set("URLENCODED", m_variableOffset);
}
}
if (keyl == "host") {
std::vector<std::string> host = utils::string::split(value, ':');
m_variableServerName.set(host[0], m_variableOffset);
}
m_variableOffset = m_variableOffset + value.size() + 1;
return 1;
}
/**
* @name addRequestHeader
* @brief Adds a request header
*
* With this method it is possible to feed ModSecurity with a request header.
*
* @note This function expects a NULL terminated string, for both: key and
* value.
*
* @param key header name.
* @param value header value.
*
* @returns If the operation was successful or not.
* @retval true Operation was successful.
* @retval false Operation failed.
*
*/
int Transaction::addRequestHeader(const unsigned char *key,
const unsigned char *value) {
return this->addRequestHeader(key,
strlen(reinterpret_cast<const char *>(key)),
value,
strlen(reinterpret_cast<const char *>(value)));
}
/**
* @name addRequestHeader
* @brief Adds a request header
*
* Do not expect a NULL terminated string, instead it expect the string and the
* string size, for the value and key.
*
* @param transaction ModSecurity transaction.
* @param key header name.
* @param key_n header name size.
* @param value header value.
* @param value_n header value size.
*
* @returns If the operation was successful or not.
* @retval 1 Operation was successful.
* @retval 0 Operation failed.
*
*/
int Transaction::addRequestHeader(const unsigned char *key, size_t key_n,
const unsigned char *value, size_t value_n) {
std::string keys;
std::string values;
keys.assign(reinterpret_cast<const char *>(key), key_n);
values.assign(reinterpret_cast<const char *>(value), value_n);
return this->addRequestHeader(keys, values);
}
/**
* @name processRequestBody
* @brief Perform the request body (if any)
*
* This method perform the analysis on the request body. It is optional to
* call that function. If this API consumer already know that there isn't a
* body for inspect it is recommended to skip this step.
*
* @note It is necessary to "append" the request body prior to the execution
* of this function.
* @note Remember to check for a possible intervention.
*
* @returns If the operation was successful or not.
* @retval true Operation was successful.
* @retval false Operation failed.
*
*/
int Transaction::processRequestBody() {
ms_dbg(4, "Starting phase REQUEST_BODY. (SecRules 2)");
if (getRuleEngineState() == RulesSetProperties::DisabledRuleEngine) {
ms_dbg(4, "Rule engine disabled, returning...");
return true;
}
if (m_variableInboundDataError.m_value.empty() == true) {
m_variableInboundDataError.set("0", 0);
}
/*
* Process the request body even if there is nothing to be done.
*
* if (m_requestBody.tellp() <= 0) {
* return true;
* }
*
*/
std::unique_ptr<std::string> a = m_variableRequestHeaders.resolveFirst(
"Content-Type");
bool requestBodyNoFilesLimitExceeded = false;
if ((m_requestBodyType == WWWFormUrlEncoded) ||
(m_requestBodyProcessor == JSONRequestBody) ||
(m_requestBodyProcessor == XMLRequestBody)) {
if ((m_rules->m_requestBodyNoFilesLimit.m_set)
&& (m_requestBody.str().size() > m_rules->m_requestBodyNoFilesLimit.m_value)) {
m_variableReqbodyError.set("1", 0);
m_variableReqbodyErrorMsg.set("Request body excluding files is bigger than the maximum expected.", 0);
m_variableInboundDataError.set("1", m_variableOffset);
ms_dbg(5, "Request body excluding files is bigger than the maximum expected.");
requestBodyNoFilesLimitExceeded = true;
}
}
#ifdef WITH_LIBXML2
if (m_requestBodyProcessor == XMLRequestBody) {
// large size might cause issues in the parsing itself; omit if exceeded
if (!requestBodyNoFilesLimitExceeded) {
std::string error;
if (m_xml->init() == true) {
m_xml->processChunk(m_requestBody.str().c_str(),
m_requestBody.str().size(),
&error);
m_xml->complete(&error);
}
if (error.empty() == false) {
m_variableReqbodyError.set("1", m_variableOffset);
m_variableReqbodyErrorMsg.set("XML parsing error: " + error,
m_variableOffset);
m_variableReqbodyProcessorErrorMsg.set("XML parsing error: " \
+ error, m_variableOffset);
m_variableReqbodyProcessorError.set("1", m_variableOffset);
} else {
m_variableReqbodyError.set("0", m_variableOffset);
m_variableReqbodyProcessorError.set("0", m_variableOffset);
}
}
#endif
#if WITH_YAJL
#ifdef WITH_LIBXML2
} else if (m_requestBodyProcessor == JSONRequestBody) {
#else
if (m_requestBodyProcessor == JSONRequestBody) {
#endif
// large size might cause issues in the parsing itself; omit if exceeded
if (!requestBodyNoFilesLimitExceeded) {
std::string error;
if (m_rules->m_requestBodyJsonDepthLimit.m_set) {
m_json->setMaxDepth(m_rules->m_requestBodyJsonDepthLimit.m_value);
}
if (m_json->init() == true) {
m_json->processChunk(m_requestBody.str().c_str(),
m_requestBody.str().size(),
&error);
m_json->complete(&error);
}
if (error.empty() == false && m_requestBody.str().size() > 0) {
m_variableReqbodyError.set("1", m_variableOffset);
m_variableReqbodyProcessorError.set("1", m_variableOffset);
m_variableReqbodyErrorMsg.set("JSON parsing error: " + error,
m_variableOffset);
m_variableReqbodyProcessorErrorMsg.set("JSON parsing error: " \
+ error, m_variableOffset);
} else {
m_variableReqbodyError.set("0", m_variableOffset);
m_variableReqbodyProcessorError.set("0", m_variableOffset);
}
}
#endif
#if defined(WITH_LIBXML2) or defined(WITH_YAJL)
} else if (m_requestBodyType == MultiPartRequestBody) {
#else
if (m_requestBodyType == MultiPartRequestBody) {
#endif
std::string error;
int reqbodyNoFilesLength = 0;
if (a != NULL) {
Multipart m(*a, this);
if (m.init(&error) == true) {
m.process(m_requestBody.str(), &error, m_variableOffset);
}
reqbodyNoFilesLength = m.m_reqbody_no_files_length;
m.multipart_complete(&error);
}
if (error.empty() == false) {
m_variableReqbodyError.set("1", m_variableOffset);
m_variableReqbodyProcessorError.set("1", m_variableOffset);
m_variableReqbodyErrorMsg.set("Multipart parsing error: " + error,
m_variableOffset);
m_variableReqbodyProcessorErrorMsg.set("Multipart parsing " \
"error: " + error, m_variableOffset);
} else if (((m_rules->m_requestBodyNoFilesLimit.m_set)
&& (reqbodyNoFilesLength > m_rules->m_requestBodyNoFilesLimit.m_value))) {
m_variableReqbodyError.set("1", 0);
m_variableReqbodyErrorMsg.set("Request body excluding files is bigger than the maximum expected.", 0);
m_variableInboundDataError.set("1", m_variableOffset);
ms_dbg(5, "Request body excluding files is bigger than the maximum expected.");
} else {
m_variableReqbodyError.set("0", m_variableOffset);
m_variableReqbodyProcessorError.set("0", m_variableOffset);
}
} else if (m_requestBodyType == WWWFormUrlEncoded) {
m_variableOffset++;
// large size might cause issues in the parsing itself; omit if exceeded
if (!requestBodyNoFilesLimitExceeded) {
extractArguments("POST", m_requestBody.str(), m_variableOffset);
}
} else if (m_requestBodyType != UnknownFormat) {
/**
* FIXME: double check to see if that is a valid scenario...
*
*/
std::string error;
if (a != NULL && a->empty() == false) {
error.assign(*a);
}
m_variableReqbodyError.set("1", m_variableOffset);
m_variableReqbodyProcessorError.set("1", m_variableOffset);
m_variableReqbodyErrorMsg.set("Unknown request body processor: " \
+ error, m_variableOffset);
m_variableReqbodyProcessorErrorMsg.set("Unknown request body " \
"processor: " + error, m_variableOffset);
} else {
m_variableReqbodyError.set("0", m_variableOffset);
m_variableReqbodyProcessorError.set("0", m_variableOffset);
}
if (m_rules->m_secRequestBodyAccess == RulesSetProperties::FalseConfigBoolean) {
if (m_requestBodyAccess != RulesSetProperties::TrueConfigBoolean) {
ms_dbg(4, "Request body processing is disabled");
return true;
} else {
ms_dbg(4, "Request body processing is disabled, but " \
"enabled to this transaction due to ctl:requestBodyAccess " \
"action");
}
} else {
if (m_requestBodyAccess == RulesSetProperties::FalseConfigBoolean) {
ms_dbg(4, "Request body processing is enabled, but " \
"disabled to this transaction due to ctl:requestBodyAccess " \
"action");
return true;
}
}
/**
* FIXME: This variable should be calculated on demand, it is
* computationally intensive.
*/
std::string fullRequest;
std::vector<const VariableValue *> l;
m_variableRequestHeaders.resolve(&l);
for (auto &h : l) {
fullRequest = fullRequest + h->getKey() + ": " + h->getValue() + "\n";
delete h;
}
fullRequest = fullRequest + "\n\n";
fullRequest = fullRequest + m_requestBody.str();
m_variableFullRequest.set(fullRequest, m_variableOffset);
m_variableFullRequestLength.set(std::to_string(fullRequest.size()),
m_variableOffset);
if (m_requestBody.tellp() > 0) {
m_variableRequestBody.set(m_requestBody.str(), m_variableOffset);
m_variableRequestBodyLength.set(std::to_string(
m_requestBody.str().size()),
m_variableOffset, m_requestBody.str().size());
}
this->m_rules->evaluate(modsecurity::RequestBodyPhase, this);
return true;
}
/**
* @name appendRequestBody
* @brief Adds request body to be inspected.
*
* With this method it is possible to feed ModSecurity with data for
* inspection regarding the request body. There are two possibilities here:
*
* 1 - Adds the buffer in a row;
* 2 - Adds it in chunks;
*
* A third option should be developed which is share your application buffer.
* In any case, remember that the utilization of this function may reduce your
* server throughput, as this buffer creations is computationally expensive.
*
* @note While feeding ModSecurity remember to keep checking if there is an
* intervention, Sec Language has the capability to set the maximum
* inspection size which may be reached, and the decision on what to do