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// Copyright 2021 Code Intelligence GmbH
//
// 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 com.code_intelligence.jazzer.sanitizers
import com.code_intelligence.jazzer.api.FuzzerSecurityIssueCritical
import com.code_intelligence.jazzer.api.HookType
import com.code_intelligence.jazzer.api.Jazzer
import com.code_intelligence.jazzer.api.MethodHook
import com.code_intelligence.jazzer.api.MethodHooks
import java.lang.Exception
import java.lang.invoke.MethodHandle
import javax.naming.NamingException
import javax.naming.directory.InvalidSearchFilterException
/**
* Detects LDAP DN and search filter injections.
*
* Untrusted input has to be escaped in such a way that queries remain valid otherwise an injection
* could be possible. This sanitizer guides the fuzzer to inject insecure characters. If an exception
* is raised during execution the fuzzer was able to inject an invalid pattern, otherwise all input
* was escaped correctly.
*
* Only the search methods are hooked, other methods are not used in injection attacks. Furthermore,
* only string parameters are checked, [javax.naming.Name] already validates inputs according to RFC2253.
*
* [javax.naming.directory.InitialDirContext] creates an initial context through the context factory
* stated in [javax.naming.Context.INITIAL_CONTEXT_FACTORY]. Other method calls are delegated to the
* initial context factory of type [javax.naming.directory.DirContext]. This is also the case for
* subclass [javax.naming.ldap.InitialLdapContext].
*/
@Suppress("unused_parameter", "unused")
object LdapInjection {
// Characters to escape in DNs
private const val NAME_CHARACTERS = "\\+<>,;\"="
// Characters to escape in search filter queries
private const val FILTER_CHARACTERS = "*()\\\u0000"
@MethodHooks(
// Single object lookup, possible DN injection
MethodHook(
type = HookType.REPLACE,
targetClassName = "javax.naming.directory.DirContext",
targetMethod = "search",
targetMethodDescriptor = "(Ljava/lang/String;Ljavax/naming.directory/Attributes;)Ljavax/naming/NamingEnumeration;",
additionalClassesToHook = ["javax.naming.directory.InitialDirContext"],
),
MethodHook(
type = HookType.REPLACE,
targetClassName = "javax.naming.directory.DirContext",
targetMethod = "search",
targetMethodDescriptor = "(Ljava/lang/String;Ljavax/naming.directory/Attributes;[Ljava/lang/Sting;)Ljavax/naming/NamingEnumeration;",
additionalClassesToHook = ["javax.naming.directory.InitialDirContext"],
),
// Object search, possible DN and search filter injection
MethodHook(
type = HookType.REPLACE,
targetClassName = "javax.naming.directory.DirContext",
targetMethod = "search",
targetMethodDescriptor = "(Ljava/lang/String;Ljava/lang/String;Ljavax/naming/directory/SearchControls;)Ljavax/naming/NamingEnumeration;",
additionalClassesToHook = ["javax.naming.directory.InitialDirContext"],
),
MethodHook(
type = HookType.REPLACE,
targetClassName = "javax.naming.directory.DirContext",
targetMethod = "search",
targetMethodDescriptor = "(Ljavax/naming/Name;Ljava/lang/String;[Ljava.lang.Object;Ljavax/naming/directory/SearchControls;)Ljavax/naming/NamingEnumeration;",
additionalClassesToHook = ["javax.naming.directory.InitialDirContext"],
),
MethodHook(
type = HookType.REPLACE,
targetClassName = "javax.naming.directory.DirContext",
targetMethod = "search",
targetMethodDescriptor = "(Ljava/lang/String;Ljava/lang/String;[Ljava/lang/Object;Ljavax/naming/directory/SearchControls;)Ljavax/naming/NamingEnumeration;",
additionalClassesToHook = ["javax.naming.directory.InitialDirContext"],
),
)
@JvmStatic
fun searchLdapContext(method: MethodHandle, thisObject: Any?, args: Array<Any>, hookId: Int): Any? {
try {
return method.invokeWithArguments(thisObject, *args).also {
(args[0] as? String)?.let { name ->
Jazzer.guideTowardsEquality(name, NAME_CHARACTERS, hookId)
}
(args[1] as? String)?.let { filter ->
Jazzer.guideTowardsEquality(filter, FILTER_CHARACTERS, 31 * hookId)
}
}
} catch (e: Exception) {
when (e) {
is InvalidSearchFilterException ->
Jazzer.reportFindingFromHook(
FuzzerSecurityIssueCritical(
"""LDAP Injection
Search filters based on untrusted data must be escaped as specified in RFC 4515.""",
),
)
is NamingException ->
Jazzer.reportFindingFromHook(
FuzzerSecurityIssueCritical(
"""LDAP Injection
Distinguished Names based on untrusted data must be escaped as specified in RFC 2253.""",
),
)
}
throw e
}
}
}
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