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package com.unboundid.directory.sdk.examples;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.security.auth.x500.X500Principal;
import com.unboundid.directory.sdk.common.types.InternalConnection;
import com.unboundid.directory.sdk.ds.api.CertificateMapper;
import com.unboundid.directory.sdk.ds.config.CertificateMapperConfig;
import com.unboundid.directory.sdk.ds.types.DirectoryServerContext;
import com.unboundid.ldap.sdk.DN;
import com.unboundid.ldap.sdk.Filter;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPSearchException;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.ldap.sdk.SearchRequest;
import com.unboundid.ldap.sdk.SearchResultEntry;
import com.unboundid.ldap.sdk.SearchScope;
import com.unboundid.util.args.ArgumentException;
import com.unboundid.util.args.ArgumentParser;
import com.unboundid.util.args.DNArgument;
import com.unboundid.util.args.StringArgument;
/**
* This class provides a simple example of a certificate mapper which will
* expect to find an attribute with the certificate's subject in the appropriate
* user's entry. It has two configuration arguments:
* <UL>
* <LI>base-dn -- The base DN below which to search for user entries. At
* least one base DN must be configured.</LI>
* <LI>subject-attribute -- The name of the attribute in which to search for
* the certificate subject.</LI>
* </UL>
*/
public final class ExampleCertificateMapper
extends CertificateMapper
{
/**
* The name of the argument that will be used to specify the name of the
* attribute to search for the certificate subject.
*/
private static final String ARG_NAME_BASE_DN = "base-dn";
/**
* The name of the argument that will be used to specify the name of the
* attribute to search for the certificate subject.
*/
private static final String ARG_NAME_SUBJECT_ATTR = "subject-attribute";
// The server context for the server in which this extension is running.
private DirectoryServerContext serverContext;
// The list of base DNs to use for the searches.
private volatile List<DN> baseDNs;
// The name of the subject attribute.
private volatile String subjectAttribute;
/**
* Creates a new instance of this certificate mapper. All certificate mapper
* implementations must include a default constructor, but any initialization
* should generally be done in the {@code initializeCertificateMapper} method.
*/
public ExampleCertificateMapper()
{
// No implementation required.
}
/**
* Retrieves a human-readable name for this extension.
*
* @return A human-readable name for this extension.
*/
@Override()
public String getExtensionName()
{
return "Example Certificate Mapper";
}
/**
* Retrieves a human-readable description for this extension. Each element
* of the array that is returned will be considered a separate paragraph in
* generated documentation.
*
* @return A human-readable description for this extension, or {@code null}
* or an empty array if no description should be available.
*/
@Override()
public String[] getExtensionDescription()
{
return new String[]
{
"This certificate mapper serves an example that may be used to " +
"demonstrate the process for creating a third-party certificate " +
"mapper. In order to establish a mapping, exactly one entry must " +
"contain a specified attribute whose value is the subject of the " +
"certificate that has been presented. The mapping will fail if " +
"no matching entries are found, or if multiple matches are found."
};
}
/**
* Updates the provided argument parser to define any configuration arguments
* which may be used by this certificate mapper. The argument parser may also
* be updated to define relationships between arguments (e.g., to specify
* required, exclusive, or dependent argument sets).
*
* @param parser The argument parser to be updated with the configuration
* arguments which may be used by this certificate mapper.
*
* @throws ArgumentException If a problem is encountered while updating the
* provided argument parser.
*/
@Override()
public void defineConfigArguments(final ArgumentParser parser)
throws ArgumentException
{
// Add an argument that allows you to specify the base DN for users.
Character shortIdentifier = null;
String longIdentifier = ARG_NAME_BASE_DN;
boolean required = true;
int maxOccurrences = 0; // No maximum.
String placeholder = "{dn}";
String description = "The base DN below which to search for user " +
"entries.";
parser.addArgument(new DNArgument(shortIdentifier, longIdentifier, required,
maxOccurrences, placeholder, description));
// Add an argument that allows you to specify the subject attribute.
shortIdentifier = null;
longIdentifier = ARG_NAME_SUBJECT_ATTR;
required = true;
maxOccurrences = 1;
placeholder = "{attribute}";
description = "The name of the attribute in user entries which holds " +
"the subject of the certificate(s) that user may use to " +
"authenticate. It should be indexed for equality below all " +
"configured base DNs.";
parser.addArgument(new StringArgument(shortIdentifier, longIdentifier,
required, maxOccurrences, placeholder, description));
}
/**
* Initializes this certificate mapper.
*
* @param serverContext A handle to the server context for the server in
* which this extension is running.
* @param config The general configuration for this certificate
* mapper.
* @param parser The argument parser which has been initialized from
* the configuration for this certificate mapper.
*
* @throws LDAPException If a problem occurs while initializing this
* certificate mapper.
*/
@Override()
public void initializeCertificateMapper(
final DirectoryServerContext serverContext,
final CertificateMapperConfig config,
final ArgumentParser parser)
throws LDAPException
{
serverContext.debugInfo("Beginning certificate mapper initialization");
this.serverContext = serverContext;
// Get the set of base DNs.
final DNArgument dnArg =
(DNArgument) parser.getNamedArgument(ARG_NAME_BASE_DN);
baseDNs = dnArg.getValues();
// Get the subject attribute.
final StringArgument attrArg =
(StringArgument) parser.getNamedArgument(ARG_NAME_SUBJECT_ATTR);
subjectAttribute = attrArg.getValue();
}
/**
* Indicates whether the configuration contained in the provided argument
* parser represents a valid configuration for this extension.
*
* @param config The general configuration for this certificate
* mapper.
* @param parser The argument parser which has been initialized
* with the proposed configuration.
* @param unacceptableReasons A list that can be updated with reasons that
* the proposed configuration is not acceptable.
*
* @return {@code true} if the proposed configuration is acceptable, or
* {@code false} if not.
*/
@Override()
public boolean isConfigurationAcceptable(final CertificateMapperConfig config,
final ArgumentParser parser,
final List<String> unacceptableReasons)
{
// No special validation is required.
return true;
}
/**
* Attempts to apply the configuration contained in the provided argument
* parser.
*
* @param config The general configuration for this
* certificate mapper.
* @param parser The argument parser which has been
* initialized with the new configuration.
* @param adminActionsRequired A list that can be updated with information
* about any administrative actions that may be
* required before one or more of the
* configuration changes will be applied.
* @param messages A list that can be updated with information
* about the result of applying the new
* configuration.
*
* @return A result code that provides information about the result of
* attempting to apply the configuration change.
*/
@Override()
public ResultCode applyConfiguration(final CertificateMapperConfig config,
final ArgumentParser parser,
final List<String> adminActionsRequired,
final List<String> messages)
{
// Get the new set of base DNs.
final DNArgument dnArg =
(DNArgument) parser.getNamedArgument(ARG_NAME_BASE_DN);
final List<DN> newBaseDNs = dnArg.getValues();
// Get the new subject attribute.
final StringArgument attrArg =
(StringArgument) parser.getNamedArgument(ARG_NAME_SUBJECT_ATTR);
final String newSubjectAttr = attrArg.getValue();
// Activate the new configuration.
baseDNs = newBaseDNs;
subjectAttribute = newSubjectAttr;
return ResultCode.SUCCESS;
}
/**
* Performs any cleanup which may be necessary when this certificate mapper is
* to be taken out of service.
*/
@Override()
public void finalizeCertificateMapper()
{
// No finalization is required.
}
/**
* Performs any processing which may be necessary to map the provided
* certificate chain to a user within the server.
*
* @param certChain The certificate chain presented by the client.
*
* @return The DN of the user within the server to which the provided
* certificate corresponds.
*
* @throws LDAPException If the presented certificate cannot be mapped to
* exactly one user in the server.
*/
@Override()
public String mapCertificate(final Certificate[] certChain)
throws LDAPException
{
final boolean debugEnabled = serverContext.debugEnabled();
// If the chain is empty, then we can't map it. This should never happen,
// but it's not bad to handle it anyway.
if ((certChain == null) || (certChain.length == 0))
{
if (debugEnabled)
{
serverContext.debugInfo("No certificate provided.");
}
return null;
}
// Get the subject of the certificate. This is only supported for X.509
// certificates.
if (! (certChain[0] instanceof X509Certificate))
{
if (debugEnabled)
{
serverContext.debugInfo(
"The provided certificate wasn't an X.509 certificate");
}
return null;
}
final X509Certificate c = (X509Certificate) certChain[0];
final X500Principal p = c.getSubjectX500Principal();
final String subject = p.getName(X500Principal.RFC2253);
if (debugEnabled)
{
serverContext.debugInfo("Certificate subject: " + subject);
}
// Construct the search request to issue. We'll swap out the base DN later.
final Filter f = Filter.createEqualityFilter(subjectAttribute, subject);
final SearchRequest r = new SearchRequest("", SearchScope.SUB, f,
SearchRequest.NO_ATTRIBUTES);
// Get an internal connection and use it to perform the searches.
String userDN = null;
final InternalConnection conn = serverContext.getInternalRootConnection();
for (final DN baseDN : baseDNs)
{
r.setBaseDN(baseDN);
try
{
// Use the searchForEntry method, which will fail if multiple entries
// are returned. However, we still need to check to see if a match was
// already found under a different base DN.
final SearchResultEntry searchEntry = conn.searchForEntry(r);
if (searchEntry == null)
{
if (debugEnabled)
{
serverContext.debugInfo("No match was found below base DN " +
baseDN);
}
continue;
}
else
{
if (debugEnabled)
{
serverContext.debugInfo("Found matching entry " + userDN);
}
}
if (userDN == null)
{
userDN = searchEntry. getDN();
}
else
{
throw new LDAPException(ResultCode.SIZE_LIMIT_EXCEEDED,
"Multiple user entries were found with certificate subject " +
subject);
}
}
catch (final LDAPSearchException lse)
{
serverContext.debugCaught(lse);
// We should examine the result code to determine how to proceed.
switch (lse.getResultCode().intValue())
{
case ResultCode.NO_SUCH_OBJECT_INT_VALUE:
// This means that the base entry doesn't exist. We can ignore
// this.
break;
case ResultCode.SIZE_LIMIT_EXCEEDED_INT_VALUE:
// This means that multiple entries were found matching the filter.
throw new LDAPException(ResultCode.SIZE_LIMIT_EXCEEDED,
"Multiple user entries were found with certificate subject " +
subject, lse);
default:
// We'll just re-throw the exception as-is.
throw lse;
}
}
}
// Return the DN of the matching user, or null if none was found.
return userDN;
}
/**
* Retrieves a map containing examples of configurations that may be used for
* this extension. The map key should be a list of sample arguments, and the
* corresponding value should be a description of the behavior that will be
* exhibited by the extension when used with that configuration.
*
* @return A map containing examples of configurations that may be used for
* this extension. It may be {@code null} or empty if there should
* not be any example argument sets.
*/
@Override()
public Map<List<String>,String> getExamplesArgumentSets()
{
final LinkedHashMap<List<String>,String> exampleMap =
new LinkedHashMap<List<String>,String>(1);
exampleMap.put(
Arrays.asList(
ARG_NAME_BASE_DN + "=dc=example,dc=com",
ARG_NAME_SUBJECT_ATTR + "=myCertSubject"),
"Attempt to map certificates to user entries by searching below " +
"dc=example,dc=com for user entries containing a myCertSubject " +
"attribute with a value equal to the subject of the presented " +
"certificate.");
return exampleMap;
}
}
