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The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications. It is designed to be used by people with a wide range of security experience and as such is ideal for developers and functional testers who are new to penetration testing. ZAP provides automated scanners as well as a set of tools that allow you to find security vulnerabilities manually.
/*
* Zed Attack Proxy (ZAP) and its related class files.
*
* ZAP is an HTTP/HTTPS proxy for assessing web application security.
*
* Copyright 2017 The ZAP Development Team
*
* Licensed under the Apache License, Version 2.0 (the "License");
* 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.parosproxy.paros.core.scanner;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.parosproxy.paros.network.HttpHeader;
import org.parosproxy.paros.network.HttpMessage;
/**
* Variant used for "multipart/form-data" POST request handling. Takes all parameters passed inside
* the form-data structure and sets them for injection.
*/
public class VariantMultipartFormParameters implements Variant {
private static final Logger LOGGER = Logger.getLogger(VariantMultipartFormParameters.class);
private static final Pattern FIELD_NAME_PATTERN =
Pattern.compile(
"\\s*content-disposition\\s*:.*\\s+name\\s*\\=?\\s*\\\"?(?.[^;\\\"\\n]*)\\\"?\\;?.*",
Pattern.CASE_INSENSITIVE);
private static final Pattern FIELD_VALUE_PATTERN = Pattern.compile("[\\r\\n]{2}(?.*)");
private static final Pattern FILENAME_PART_PATTERN =
Pattern.compile(
"\\s*content-disposition\\s*:.*filename\\s*\\=?\\s*\\\"?(?.[^;\"\\n]*)\\\"?\\;?.*",
Pattern.CASE_INSENSITIVE);
// http://fiddle.re/etxbnd (Click Java, set case insensitive, and hit "test")
private static final Pattern CONTENTTYPE_PART_PATTERN =
Pattern.compile(
"\\s*content-disposition.*content-type\\s*:\\s*\\s*\\\"?(?.[^;\"\\r\\n]*)\\\"?\\;?.*",
Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
// http://www.regexplanet.com/share/index.html?share=yyyyyythear (Click Java, set case
// insensitive & DOTALL, and hit "test")
private List params = Collections.emptyList();
private List multiPartParams = new ArrayList();
@Override
public void setMessage(HttpMessage msg) {
if (msg == null) {
throw new IllegalArgumentException("Parameter message must not be null.");
}
String contentType = msg.getRequestHeader().getHeader(HttpHeader.CONTENT_TYPE);
if (contentType == null || !contentType.toLowerCase().startsWith("multipart/form-data")) {
return;
}
ArrayList extractedParameters = new ArrayList<>();
int position = 0;
int offset = 0;
String boundary = getBoundary(contentType) + HttpHeader.CRLF;
for (String part : msg.getRequestBody().toString().split(boundary)) {
if (!StringUtils.isBlank(part)) {
String partHeaderLine =
part.substring(0, part.indexOf(HttpHeader.CRLF + HttpHeader.CRLF));
boolean isFileParam = partHeaderLine.contains("filename=");
part = boundary + part;
Matcher nameMatcher = FIELD_NAME_PATTERN.matcher(partHeaderLine);
Matcher valueMatcher = FIELD_VALUE_PATTERN.matcher(part);
nameMatcher.find();
valueMatcher.find();
if (StringUtils.isBlank(valueMatcher.group("value"))) {
valueMatcher.find();
// Need to skip one find for some reason...
// https://regex101.com/r/4ig6Wk/1
// http://fiddle.re/23cudd (Click Java, hit "test")
}
String name = nameMatcher.group("name");
// Value doesn't include boundary, headerline, or double CRLF
String value =
part.replaceAll(
Pattern.quote(boundary + partHeaderLine)
+ HttpHeader.CRLF
+ HttpHeader.CRLF,
"");
value =
value.replaceAll(
HttpHeader.CRLF
+ "("
+ Pattern.quote(getBoundary(contentType))
+ "--"
+ HttpHeader.CRLF
+ ")?$",
""); // Strip final boundary
if (isFileParam) {
extractedParameters.add(
new NameValuePair(
NameValuePair.TYPE_MULTIPART_DATA_FILE_PARAM,
name,
value,
position));
} else {
extractedParameters.add(
new NameValuePair(
NameValuePair.TYPE_MULTIPART_DATA_PARAM,
name,
value,
position));
}
int start =
offset
+ part.indexOf(HttpHeader.CRLF + HttpHeader.CRLF)
+ 4; // 4 for two CRLFs
int end = start + value.length();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"Name: " + name + " O: " + offset + " S: " + start + " E: " + end
+ " Pos: " + position);
}
multiPartParams.add(
new MultipartFormParameter(
name,
valueMatcher.group("value"),
start,
end,
position,
MultipartFormParameter.Type.GENERAL));
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Name: " + name + " value: " + valueMatcher.group("value"));
}
if (isFileParam) {
// Extract the filename
Matcher fnValueMatcher = FILENAME_PART_PATTERN.matcher(part);
fnValueMatcher.find();
String fnValue = fnValueMatcher.group("filename");
extractedParameters.add(
new NameValuePair(
NameValuePair.TYPE_MULTIPART_DATA_FILE_NAME,
name,
fnValue,
++position));
int fnStart = offset + part.indexOf(fnValue);
int fnEnd = fnStart + fnValue.length();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"Name: " + name + " O: " + offset + " S: " + fnStart + " E: "
+ fnEnd + " Pos: " + position);
}
multiPartParams.add(
new MultipartFormParameter(
name,
fnValue,
fnStart,
fnEnd,
position,
MultipartFormParameter.Type.FILE_NAME));
// Extract the content-type
Matcher ctValueMatcher = CONTENTTYPE_PART_PATTERN.matcher(part);
ctValueMatcher.find();
String ctValue = ctValueMatcher.group("contenttype");
extractedParameters.add(
new NameValuePair(
NameValuePair.TYPE_MULTIPART_DATA_FILE_CONTENTTYPE,
name,
ctValue,
++position));
int ctStart = offset + part.indexOf(ctValue);
int ctEnd = ctStart + ctValue.length();
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"Name: " + name + " O: " + offset + " S: " + ctStart + " E: "
+ ctEnd + " Pos: " + position);
}
multiPartParams.add(
new MultipartFormParameter(
name,
ctValue,
ctStart,
ctEnd,
position,
MultipartFormParameter.Type.FILE_CONTENT_TYPE));
}
}
position++;
offset = offset + part.length();
}
params = Collections.unmodifiableList(extractedParameters);
}
@Override
public List getParamList() {
return params;
}
@Override
public String setParameter(
HttpMessage msg, NameValuePair originalPair, String name, String value) {
return setParameter(msg, originalPair, value);
}
@Override
public String setEscapedParameter(
HttpMessage msg, NameValuePair originalPair, String name, String value) {
return setParameter(msg, originalPair, value);
}
private String setParameter(HttpMessage msg, NameValuePair originalPair, String value) {
StringBuilder newBodyBuilder = new StringBuilder(msg.getRequestBody().toString());
int idx = originalPair.getPosition() - 1;
MultipartFormParameter mpPart = multiPartParams.get(idx);
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"i: "
+ idx
+ " pos: "
+ originalPair.getPosition()
+ " S: "
+ mpPart.getStart()
+ " E: "
+ mpPart.getEnd());
}
newBodyBuilder.replace(mpPart.getStart(), mpPart.getEnd(), value);
String newBody = newBodyBuilder.toString();
msg.getRequestBody().setBody(newBody);
return newBody;
}
private String getBoundary(String contentTypeHeader) {
int index = contentTypeHeader.lastIndexOf("boundary=");
if (index == -1) {
return null;
}
String boundary = contentTypeHeader.substring(index + 9); // "boundary=" is 9
if (boundary.charAt(0) == '"') {
index = boundary.lastIndexOf('"');
boundary = boundary.substring(1, index);
}
// The real token is always preceded by an extra "--"
boundary = "--" + boundary;
return boundary;
}
}