org.eclipse.jetty.http.HttpCompliance Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.http;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableSet;
import static java.util.EnumSet.allOf;
import static java.util.EnumSet.complementOf;
import static java.util.EnumSet.noneOf;
import static java.util.EnumSet.of;
/**
* HTTP compliance modes for Jetty HTTP parsing and handling.
* A Compliance mode consists of a set of {@link Violation}s which are applied
* when the mode is enabled.
*/
public final class HttpCompliance implements ComplianceViolation.Mode
{
protected static final Logger LOG = LoggerFactory.getLogger(HttpCompliance.class);
// These are compliance violations, which may optionally be allowed by the compliance mode, which mean that
// the relevant section of the RFC is not strictly adhered to.
public enum Violation implements ComplianceViolation
{
/**
* The HTTP RFC(s) require that field names are case-insensitive, so for example the fields "{@code Content-Type: text/xml}"
* and "{@code content-type: text/xml}" are considered equivalent. Jetty has been optimized to take advantage of this by
* looking up field names in a case insensitive cache and will by default provide the standard capitalisation of a field
* name rather than create a new string with the actual capitalisation received. However, some applications have been
* written to expect a specific capitalisation of field, so deployments of such applications must include this violation
* in their {@link HttpCompliance} mode to prevent Jetty altering the case of the fields received. Jetty itself will still
* match and handle fields names insensitively and this violation only affects how the names are reported to the application.
* There is a small performance and garbage impact of using this mode.
*/
CASE_SENSITIVE_FIELD_NAME("https://tools.ietf.org/html/rfc7230#section-3.2", "Field name is case-insensitive"),
/**
* The HTTP RFC(s) require that method names are case sensitive, so that "{@code Get}" and "{@code GET}" are considered
* different methods. Jetty releases prior to 9.4 used a case insensitive cache to match method names, thus this requirement
* was violated. Deployments which wish to retain this legacy violation can include this violation in the
* {@link HttpCompliance} mode.
*/
CASE_INSENSITIVE_METHOD("https://tools.ietf.org/html/rfc7230#section-3.1.1", "Method is case-sensitive"),
/**
* Since RFC 7230, the expectation that HTTP/0.9 is supported has been removed from the specification. If a deployment
* wished to accept HTTP/0.9 requests, then it can include this violation in it's {@link HttpCompliance} mode.
*/
HTTP_0_9("https://tools.ietf.org/html/rfc7230#appendix-A.2", "HTTP/0.9 not supported"),
/**
* Since RFC 7230, the HTTP protocol no longer supports
* line folding, which allows a field value to be provided over several lines. Deployments that wish to receive folder
* field values may include this violation in their {@link HttpCompliance} mode.
*/
MULTILINE_FIELD_VALUE("https://tools.ietf.org/html/rfc7230#section-3.2.4", "Line Folding not supported"),
/**
* Since RFC 7230, the HTTP protocol has required that
* a request is invalid if it contains multiple {@code Content-Length} fields or values. The request may be treated
* as invalid even if the multiple values are the same. A deployment may include this violation to allow multiple
* {@code Content-Length} values to be received, but only if they are identical.
*/
MULTIPLE_CONTENT_LENGTHS("https://tools.ietf.org/html/rfc7230#section-3.3.2", "Multiple Content-Lengths"),
/**
* Since RFC 7230, the HTTP protocol has required that
* a request is invalid if it contains both a {@code Transfer-Encoding} field and {@code Content-Length} field.
* A deployment may include this violation to allow both fields to be in a received request.
*/
TRANSFER_ENCODING_WITH_CONTENT_LENGTH("https://tools.ietf.org/html/rfc7230#section-3.3.1", "Transfer-Encoding and Content-Length"),
/**
* Since RFC 7230, the HTTP protocol has required that
* a request header field has no white space after the field name and before the ':'.
* A deployment may include this violation to allow such fields to be in a received request.
*/
WHITESPACE_AFTER_FIELD_NAME("https://tools.ietf.org/html/rfc7230#section-3.2.4", "Whitespace not allowed after field name"),
/**
* Prior to RFC 7230, the HTTP protocol allowed a header
* line of a single token with neither a colon nor value following, to be interpreted as a field name with no value.
* A deployment may include this violation to allow such fields to be in a received request.
*/
NO_COLON_AFTER_FIELD_NAME("https://tools.ietf.org/html/rfc7230#section-3.2", "Fields must have a Colon"),
/**
* Since RFC 7230: Section 5.4, the HTTP protocol
* says that a Server must reject a request duplicate host headers.
* A deployment may include this violation to allow duplicate host headers on a received request.
*/
DUPLICATE_HOST_HEADERS("https://www.rfc-editor.org/rfc/rfc7230#section-5.4", "Duplicate Host Header"),
/**
* Since RFC 7230, the HTTP protocol
* should reject a request if the Host headers contains an invalid / unsafe authority.
* A deployment may include this violation to allow unsafe host headesr on a received request.
*/
UNSAFE_HOST_HEADER("https://www.rfc-editor.org/rfc/rfc7230#section-2.7.1", "Invalid Authority"),
/**
* Since RFC 7230: Section 5.4, the HTTP protocol
* must reject a request if the target URI has an authority that is different than a provided Host header.
* A deployment may include this violation to allow different values on the target URI and the Host header on a received request.
*/
MISMATCHED_AUTHORITY("https://www.rfc-editor.org/rfc/rfc7230#section-5.4", "Mismatched Authority");
private final String url;
private final String description;
Violation(String url, String description)
{
this.url = url;
this.description = description;
}
@Override
public String getName()
{
return name();
}
@Override
public String getURL()
{
return url;
}
@Override
public String getDescription()
{
return description;
}
}
/**
* The request attribute which may be set to record any allowed HTTP violations.
*/
public static final String VIOLATIONS_ATTR = "org.eclipse.jetty.http.compliance.violations";
/**
* The HttpCompliance mode that supports RFC 7230
* with no known violations.
*/
public static final HttpCompliance RFC7230 = new HttpCompliance("RFC7230", noneOf(Violation.class));
/**
* The HttpCompliance mode that supports RFC 7230
* with only the violations that differ from {@link #RFC7230}.
*/
public static final HttpCompliance RFC2616 = new HttpCompliance("RFC2616", of(
Violation.HTTP_0_9,
Violation.MULTILINE_FIELD_VALUE,
Violation.MISMATCHED_AUTHORITY
));
/**
* A legacy HttpCompliance mode that allows all violations except case-insensitive methods.
*/
public static final HttpCompliance LEGACY = new HttpCompliance("LEGACY", complementOf(of(Violation.CASE_INSENSITIVE_METHOD)));
/**
* A legacy HttpCompliance mode that supports {@link #RFC2616}, but that also allows: case-insensitive methods;
* colons after field names; {@code Transfer-Encoding} with {@code Content-Length} fields; and multiple {@code Content-Length} values.
*/
public static final HttpCompliance RFC2616_LEGACY = RFC2616.with("RFC2616_LEGACY",
Violation.CASE_INSENSITIVE_METHOD,
Violation.NO_COLON_AFTER_FIELD_NAME,
Violation.TRANSFER_ENCODING_WITH_CONTENT_LENGTH,
Violation.MULTIPLE_CONTENT_LENGTHS);
/**
* A legacy HttpCompliance mode that supports {@link #RFC7230}, but with case-insensitive methods allowed.
*/
public static final HttpCompliance RFC7230_LEGACY = RFC7230.with("RFC7230_LEGACY", Violation.CASE_INSENSITIVE_METHOD);
private static final List KNOWN_MODES = Arrays.asList(RFC7230, RFC2616, LEGACY, RFC2616_LEGACY, RFC7230_LEGACY);
private static final AtomicInteger __custom = new AtomicInteger();
/**
* Get a known compliance mode by name.
* @param name The name of a known {@link HttpCompliance} mode.
* @return The mode matching the name.
*/
public static HttpCompliance valueOf(String name)
{
for (HttpCompliance compliance : KNOWN_MODES)
{
if (compliance.getName().equals(name))
return compliance;
}
LOG.warn("Unknown HttpCompliance mode {}", name);
return null;
}
/**
* Create compliance mode from a String description.
*
* Format:
*
*
* - 0
- No {@link Violation}s
* - *
- All {@link Violation}s
* - RFC2616
- The set of {@link Violation}s application to https://tools.ietf.org/html/rfc2616,
* but not https://tools.ietf.org/html/rfc7230
* - RFC7230
- The set of {@link Violation}s application to https://tools.ietf.org/html/rfc7230
* - name
- Any of the known modes defined in {@link HttpCompliance#KNOWN_MODES}
*
*
* The remainder of the list can contain then names of {@link Violation}s to include them in the mode, or prefixed
* with a '-' to exclude them from the mode.
*
*
* @param spec A string describing the compliance
* @return the HttpCompliance instance derived from the string description
*/
public static HttpCompliance from(String spec)
{
Set sections;
String[] elements = spec.split("\\s*,\\s*");
switch (elements[0])
{
case "0":
sections = noneOf(Violation.class);
break;
case "*":
sections = allOf(Violation.class);
break;
default:
{
HttpCompliance mode = HttpCompliance.valueOf(elements[0]);
sections = (mode == null) ? noneOf(HttpCompliance.Violation.class) : copyOf(mode.getAllowed());
}
}
for (int i = 1; i < elements.length; i++)
{
String element = elements[i];
boolean exclude = element.startsWith("-");
if (exclude)
element = element.substring(1);
Violation section = Violation.valueOf(element);
if (exclude)
sections.remove(section);
else
sections.add(section);
}
return new HttpCompliance("CUSTOM" + __custom.getAndIncrement(), sections);
}
private final String _name;
private final Set _violations;
private HttpCompliance(String name, Set violations)
{
Objects.requireNonNull(violations);
_name = name;
_violations = unmodifiableSet(violations.isEmpty() ? noneOf(Violation.class) : copyOf(violations));
}
@Override
public boolean allows(ComplianceViolation violation)
{
return violation instanceof Violation && _violations.contains(violation);
}
@Override
public String getName()
{
return _name;
}
@Override
public Set getAllowed()
{
return _violations;
}
@Override
public Set getKnown()
{
return EnumSet.allOf(Violation.class);
}
/**
* Create a new HttpCompliance mode that includes the passed {@link Violation}s.
*
* @param name The name of the new mode
* @param violations The violations to include
* @return A new {@link HttpCompliance} mode.
*/
public HttpCompliance with(String name, Violation... violations)
{
Set union = _violations.isEmpty() ? EnumSet.noneOf(Violation.class) : copyOf(_violations);
union.addAll(copyOf(violations));
return new HttpCompliance(name, union);
}
/**
* Create a new HttpCompliance mode that excludes the passed {@link Violation}s.
*
* @param name The name of the new mode
* @param violations The violations to exclude
* @return A new {@link HttpCompliance} mode.
*/
public HttpCompliance without(String name, Violation... violations)
{
Set remainder = _violations.isEmpty() ? EnumSet.noneOf(Violation.class) : copyOf(_violations);
remainder.removeAll(copyOf(violations));
return new HttpCompliance(name, remainder);
}
@Override
public String toString()
{
return String.format("%s%s", _name, _violations);
}
private static Set copyOf(Violation[] violations)
{
if (violations == null || violations.length == 0)
return EnumSet.noneOf(Violation.class);
return EnumSet.copyOf(asList(violations));
}
private static Set copyOf(Set violations)
{
if (violations == null || violations.isEmpty())
return EnumSet.noneOf(Violation.class);
return EnumSet.copyOf(violations);
}
}