org.apache.hadoop.security
Class SecurityUtil

java.lang.Object
  org.apache.hadoop.security.SecurityUtil

public class SecurityUtil
extends Object

Nested Class Summary

protected static class

SecurityUtil.QualifiedHostResolver This an alternate resolver with important properties that the standard java resolver lacks: 1) The hostname is fully qualified.

Field Summary

static String	HOSTNAME_PATTERN
static org.apache.commons.logging.Log	LOG

Constructor Summary

SecurityUtil()

Method Summary

static String	buildDTServiceName(URI uri, int defPort) create the service name for a Delegation token
static Text	buildTokenService(InetSocketAddress addr) Construct the service key for a token
static void	fetchServiceTicket(URL remoteHost) Explicitly pull the service ticket for the specified host.
static AccessControlList	getAdminAcls(Configuration conf, String configKey) Get the ACL object representing the cluster administrators The user who starts the daemon is automatically added as an admin
static InetAddress	getByName(String hostname) Resolves a host subject to the security requirements determined by hadoop.security.token.service.use_ip.
static String	getHostFromPrincipal(String principalName) Get the host name from the principal name of format /host@realm.
static String	getServerPrincipal(String principalConfig, InetAddress addr) Convert Kerberos principal name pattern to valid Kerberos principal names.
static String	getServerPrincipal(String principalConfig, String hostname) Convert Kerberos principal name pattern to valid Kerberos principal names.
static InetSocketAddress	getTokenServiceAddr(Token<?> token) Decode the given token's service field into an InetAddress
protected static boolean	isOriginalTGT(String name)
static void	login(Configuration conf, String keytabFileKey, String userNameKey) If a keytab has been provided, login as that user.
static void	login(Configuration conf, String keytabFileKey, String userNameKey, String hostname) If a keytab has been provided, login as that user.
static void	setTokenService(Token<?> token, InetSocketAddress addr) Set the given token's service to the format expected by the RPC client

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

HOSTNAME_PATTERN

public static final String HOSTNAME_PATTERN

See Also:

Constant Field Values

Constructor Detail

SecurityUtil

public SecurityUtil()

Method Detail

isOriginalTGT

protected static boolean isOriginalTGT(String name)

fetchServiceTicket

public static void fetchServiceTicket(URL remoteHost)
                               throws IOException

Explicitly pull the service ticket for the specified host. This solves a problem with Java's Kerberos SSL problem where the client cannot authenticate against a cross-realm service. It is necessary for clients making kerberized https requests to call this method on the target URL to ensure that in a cross-realm environment the remote host will be successfully authenticated. This method is internal to Hadoop and should not be used by other applications. This method should not be considered stable or open: it will be removed when the Java behavior is changed.

Parameters:

remoteHost - Target URL the krb-https client will access

Throws:

IOException - if a service ticket is not available

getServerPrincipal

public static String getServerPrincipal(String principalConfig,
                                        String hostname)
                                 throws IOException

Convert Kerberos principal name pattern to valid Kerberos principal names. It replaces hostname pattern with hostname, which should be fully-qualified domain name. If hostname is null or "0.0.0.0", it uses dynamically looked-up fqdn of the current host instead.

Parameters:

principalConfig - the Kerberos principal name conf value to convert

hostname - the fully-qualified domain name used for substitution

Returns:

converted Kerberos principal name

Throws:

IOException - if the service ticket cannot be retrieved

getServerPrincipal

public static String getServerPrincipal(String principalConfig,
                                        InetAddress addr)
                                 throws IOException

Convert Kerberos principal name pattern to valid Kerberos principal names. This method is similar to getServerPrincipal(String, String), except 1) the reverse DNS lookup from addr to hostname is done only when necessary, 2) param addr can't be null (no default behavior of using local hostname when addr is null).

Parameters:

principalConfig - Kerberos principal name pattern to convert

addr - InetAddress of the host used for substitution

Returns:

converted Kerberos principal name

Throws:

IOException - if the client address cannot be determined

login

public static void login(Configuration conf,
                         String keytabFileKey,
                         String userNameKey)
                  throws IOException

If a keytab has been provided, login as that user. Substitute $host in user's Kerberos principal name with a dynamically looked-up fully-qualified domain name of the current host.

Parameters:

conf - conf to use

keytabFileKey - the key to look for keytab file in conf

userNameKey - the key to look for user's Kerberos principal name in conf

Throws:

IOException - if the client address cannot be determined

login

public static void login(Configuration conf,
                         String keytabFileKey,
                         String userNameKey,
                         String hostname)
                  throws IOException

If a keytab has been provided, login as that user. Substitute $host in user's Kerberos principal name with hostname.

Parameters:

conf - conf to use

keytabFileKey - the key to look for keytab file in conf

userNameKey - the key to look for user's Kerberos principal name in conf

hostname - hostname to use for substitution

Throws:

IOException - if login fails

getTokenServiceAddr

public static InetSocketAddress getTokenServiceAddr(Token<?> token)

Decode the given token's service field into an InetAddress

Parameters:

token - from which to obtain the service

Returns:

InetAddress for the service

setTokenService

public static void setTokenService(Token<?> token,
                                   InetSocketAddress addr)

Set the given token's service to the format expected by the RPC client

Parameters:

token - a delegation token

addr - the socket for the rpc connection

buildTokenService

public static Text buildTokenService(InetSocketAddress addr)

Construct the service key for a token

Parameters:

addr - InetSocketAddress of remote connection with a token

Returns:

"ip:port" or "host:port" depending on the value of hadoop.security.token.service.use_ip

buildDTServiceName

public static String buildDTServiceName(URI uri,
                                        int defPort)

create the service name for a Delegation token

Parameters:

uri - of the service

defPort - is used if the uri lacks a port

Returns:

the token service, or null if no authority

See Also:

buildTokenService(InetSocketAddress)

getAdminAcls

public static AccessControlList getAdminAcls(Configuration conf,
                                             String configKey)

Get the ACL object representing the cluster administrators The user who starts the daemon is automatically added as an admin

Parameters:

conf -

configKey - the key that holds the ACL string in its value

Returns:

AccessControlList instance

getHostFromPrincipal

public static String getHostFromPrincipal(String principalName)

Get the host name from the principal name of format /host@realm.

Parameters:

principalName - principal name of format as described above

Returns:

host name if the the string conforms to the above format, else null

getByName

public static InetAddress getByName(String hostname)
                             throws UnknownHostException

Resolves a host subject to the security requirements determined by hadoop.security.token.service.use_ip.

Parameters:

hostname - host or ip to resolve

Returns:

a resolved host

Throws:

UnknownHostException - if the host doesn't exist