Authen::Krb5::Simple(3)

NAME
Authen::Krb5::Simple - Basic user authentication using Kerberos 5

SYNOPSIS
  use Authen::Krb5::Simple;

  my $krb = Authen::Krb5::Simple->new([realm => 'MY.KRB.REALM']);

  # Authenticate a user.
  #
  my $authen = $krb->authenticate($user, $password);

  unless($authen) {
      my $errmsg = $krb->errstr();
      die "User: $user authentication failed: $errmsg\n";
  }

  # Get the current default realm.
  #
  my $realm = $krb->realm();

  # Set the current realm
  #
  $krb->realm('MY.NEW.REALM');

DESCRIPTION
The "Authen::Krb5::Simple" module provides a means to authenticate a user/password using Kerberos 5 protocol. The module's authenticate function takes a username (or user@kerberos_realm) and a password, and authenticates that user using the local Kerberos 5 installation. It was initially created to allow perl scripts to perform authentication against a Microsoft Active Directory (AD) server configured to accept Kerberos client requests.

It is important to note: This module only performs simple authentication. It does not get, grant, use, or retain any kerberos tickets. It will check user credentials against the Kerberos server (as configured on the local system) each time the authenticate method is called.

CONSTRUCTOR
new

    The new method creates the Authen::Krb5::Simple object. It can take an optional argument hash. At present the only recognized argument is "realm".

    If no realm is specified, the default realm for the local host will be assumed. Once set, the specified realm will be used for all subsequent authentication calls. The realm can be changed using the realm function (see below).

    Examples:

    Using the default realm:

      my $krb = Authen::Krb5::Simple->new();

    specifying a realm:

      my $krb = Authen::Krb5::Simple->new(realm => 'another.realm.net');

METHODS
authenticate($user[@realm], $password)

    the authenticate method takes the user (or user@realm) and a password, and uses kerberos 5 (the local systems installation) to authenticate the user.

    if the user/password is good, authenticate will return a true value. Otherwise, a false value is returned and the error code is stored in the object.

      if($krb->authenticate($user, $pw)) {
          print "$user authentication successful\n";
      } else {
          print "$user authentication failed: ", $krb->errstr(), "\n";
      }

realm([NEW.REALM])

    The realm method is used to set or get the current default realm. If an argument is passed to this method, the default realm is set to its value. If no argument is supplied, the current realm is returned.

errstr

    The errstr method will return the error message from the most recent authentication call.

errcode

    The errstr method will return the krb5 error code from the most recent authentication call. This value will not be very useful. Use the errstr method to get a meaningful error message.

BUGS
This version of Authen::Krb5::Simple does not support empty passwords. If you pass an empty string ('') as a password, authenticate will print a warning and return false, but there will be no error code or string when errstr is called.

AUTHOR
Damien S. Stuart, <damien.stuart@usi.net>

SEE ALSO
perl, Kerberos5 documentation.