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-# Wallet::ACL::NetDB -- Wallet NetDB role ACL verifier.
-#
-# Written by Russ Allbery <eagle@eyrie.org>
-# Copyright 2007, 2010
-# The Board of Trustees of the Leland Stanford Junior University
-#
-# See LICENSE for licensing terms.
-
-##############################################################################
-# Modules and declarations
-##############################################################################
-
-package Wallet::ACL::NetDB;
-require 5.006;
-
-use strict;
-use vars qw(@ISA $VERSION);
-
-use Wallet::ACL::Base;
-use Wallet::Config;
-
-@ISA = qw(Wallet::ACL::Base);
-
-# This version should be increased on any code change to this module. Always
-# use two digits for the minor version with a leading zero if necessary so
-# that it will sort properly.
-$VERSION = '0.05';
-
-##############################################################################
-# Interface
-##############################################################################
-
-# Creates a new persistant verifier. Load the Net::Remctl module and open a
-# persistant remctl connection that we'll use for later calls.
-sub new {
- my $type = shift;
- my $host = $Wallet::Config::NETDB_REMCTL_HOST;
- unless ($host and $Wallet::Config::NETDB_REMCTL_CACHE) {
- die "NetDB ACL support not configured\n";
- }
- eval { require Net::Remctl };
- if ($@) {
- my $error = $@;
- chomp $error;
- 1 while ($error =~ s/ at \S+ line \d+\.?\z//);
- die "NetDB ACL support not available: $error\n";
- }
- local $ENV{KRB5CCNAME} = $Wallet::Config::NETDB_REMCTL_CACHE;
- my $remctl = Net::Remctl->new;
-
- # Net::Remctl 2.12 and later will support passing in an empty string for
- # the principal. Until then, be careful not to pass principal unless it
- # was specified.
- my $port = $Wallet::Config::NETDB_REMCTL_PORT || 0;
- my $principal = $Wallet::Config::NETDB_REMCTL_PRINCIPAL;
- my $status;
- if (defined $principal) {
- $status = $remctl->open ($host, $port, $principal);
- } else {
- $status = $remctl->open ($host, $port);
- }
- unless ($status) {
- die "cannot connect to NetDB remctl interface: ", $remctl->error, "\n";
- }
- my $self = { remctl => $remctl };
- bless ($self, $type);
- return $self;
-}
-
-# Check whether the given principal has one of the user, administrator, or
-# admin team roles in NetDB for the given host. Returns 1 if it does, 0 if it
-# doesn't, and undef, setting the error, if there's some failure in making the
-# remctl call.
-sub check {
- my ($self, $principal, $acl) = @_;
- unless ($principal) {
- $self->error ('no principal specified');
- return;
- }
- unless ($acl) {
- $self->error ('malformed netdb ACL');
- return;
- }
- my $remctl = $self->{remctl};
- if ($Wallet::Config::NETDB_REALM) {
- $principal =~ s/\@\Q$Wallet::Config::NETDB_REALM\E\z//;
- }
- unless ($remctl->command ('netdb', 'node-roles', $principal, $acl)) {
- $self->error ('cannot check NetDB ACL: ' . $remctl->error);
- return;
- }
- my ($roles, $output, $status, $error);
- do {
- $output = $remctl->output;
- if ($output->type eq 'output') {
- if ($output->stream == 1) {
- $roles .= $output->data;
- } else {
- $error .= $output->data;
- }
- } elsif ($output->type eq 'error') {
- $self->error ('cannot check NetDB ACL: ' . $output->data);
- return;
- } elsif ($output->type eq 'status') {
- $status = $output->status;
- } else {
- $self->error ('malformed NetDB remctl token: ' . $output->type);
- return;
- }
- } while ($output->type eq 'output');
- if ($status == 0) {
- $roles ||= '';
- my @roles = split (' ', $roles);
- for my $role (@roles) {
- return 1 if $role eq 'admin';
- return 1 if $role eq 'team';
- return 1 if $role eq 'user';
- }
- return 0;
- } else {
- if ($error) {
- chomp $error;
- $error =~ s/\n/ /g;
- $self->error ("error checking NetDB ACL: $error");
- } else {
- $self->error ("error checking NetDB ACL");
- }
- return;
- }
-}
-
-1;
-__END__
-
-##############################################################################
-# Documentation
-##############################################################################
-
-=for stopwords
-ACL NetDB remctl DNS DHCP Allbery netdb verifier
-
-=head1 NAME
-
-Wallet::ACL::NetDB - Wallet ACL verifier for NetDB roles
-
-=head1 SYNOPSIS
-
- my $verifier = Wallet::ACL::NetDB->new;
- my $status = $verifier->check ($principal, $node);
- if (not defined $status) {
- die "Something failed: ", $verifier->error, "\n";
- } elsif ($status) {
- print "Access granted\n";
- } else {
- print "Access denied\n";
- }
-
-=head1 DESCRIPTION
-
-Wallet::ACL::NetDB checks a principal against the NetDB roles for a given
-host. It is used to verify ACL lines of type C<netdb>. The value of such
-an ACL is a node, and the ACL grants access to a given principal if and
-only if that principal has one of the roles user, admin, or team for that
-node.
-
-To use this object, several configuration parameters must be set. See
-L<Wallet::Config> for details on those configuration parameters and
-information about how to set wallet configuration.
-
-=head1 METHODS
-
-=over 4
-
-=item new()
-
-Creates a new ACL verifier. Opens the remctl connection to the NetDB
-server and authenticates.
-
-=item check(PRINCIPAL, ACL)
-
-Returns true if PRINCIPAL is granted access according to ACL, false if
-not, and undef on an error (see L<"DIAGNOSTICS"> below). ACL is a node,
-and PRINCIPAL will be granted access if it (with the realm stripped off if
-configured) has the user, admin, or team role for that node.
-
-=item error()
-
-Returns the error if check() returned undef.
-
-=back
-
-=head1 DIAGNOSTICS
-
-The new() method may fail with one of the following exceptions:
-
-=over 4
-
-=item NetDB ACL support not available: %s
-
-The Net::Remctl Perl module, required for NetDB ACL support, could not be
-loaded.
-
-=item NetDB ACL support not configured
-
-The required configuration parameters were not set. See Wallet::Config(3)
-for the required configuration parameters and how to set them.
-
-=item cannot connect to NetDB remctl interface: %s
-
-Connecting to the NetDB remctl interface failed with the given error
-message.
-
-=back
-
-Verifying a NetDB ACL may fail with the following errors (returned by the
-error() method):
-
-=over 4
-
-=item cannot check NetDB ACL: %s
-
-Issuing the remctl command to get the roles for the given principal failed
-or returned an error.
-
-=item error checking NetDB ACL: %s
-
-The NetDB remctl interface that returns the roles for a user returned an
-error message or otherwise returned failure.
-
-=item malformed netdb ACL
-
-The ACL parameter to check() was malformed. Currently, this error is only
-given if ACL is undefined or the empty string.
-
-=item malformed NetDB remctl token: %s
-
-The Net::Remctl Perl library returned a malformed token. This should
-never happen and indicates a bug in Net::Remctl.
-
-=item no principal specified
-
-The PRINCIPAL parameter to check() was undefined or the empty string.
-
-=back
-
-=head1 CAVEATS
-
-The list of possible NetDB roles that should be considered sufficient to
-grant access is not currently configurable.
-
-=head1 SEE ALSO
-
-Net::Remctl(3), Wallet::ACL(3), Wallet::ACL::Base(3), Wallet::Config(3),
-wallet-backend(8)
-
-NetDB is a free software system for managing DNS, DHCP, and related
-machine information for large organizations. For more information on
-NetDB, see L<http://www.stanford.edu/group/networking/netdb/>.
-
-This module is part of the wallet system. The current version is
-available from L<http://www.eyrie.org/~eagle/software/wallet/>.
-
-=head1 AUTHOR
-
-Russ Allbery <eagle@eyrie.org>
-
-=cut
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