xlogin.in 2.84 KB
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#!/usr/bin/perl -wT
#
# Copyright (c) 2005 University of Utah and the Flux Group.
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# 
# {{{EMULAB-LICENSE
# 
# This file is part of the Emulab network testbed software.
# 
# This file is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# 
# This file is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
# License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.
# 
# }}}
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#
use English;
use Getopt::Std;

#
# Cross domain login.
#
sub usage()
{
    print STDOUT "Usage: xlogin <host> <uid> <key>\n";
    exit(-1);
}
my $optlist = "d";
my $debug   = 0;

#
# Configure variables
#
my $TB		= "@prefix@";
my $TBOPS       = "@TBOPSEMAIL@";
my $SSH         = "/usr/bin/ssh";
my $XLOGINUSER  = "authelab";
my $XLOGINCMD   = "/usr/local/datapository/bin/xdomain_auth";

#
# Untaint the path
# 
$ENV{'PATH'} = "/bin:/usr/bin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

#
# Turn off line buffering on output
#
$| = 1;

#
# Load the Testbed support stuff. 
#
use lib "@prefix@/lib";
use libdb;
use libtestbed;

#
# We do not want to run this script unless its the real version.
#
if ($EUID != 0) {
    die("*** $0:\n".
	"    Must be setuid! Maybe its a development version?\n");
}

#
# This script is setuid, so please do not run it as root. Hard to track
# what has happened.
# 
if ($UID == 0) {
    die("*** $0:\n".
	"    Please do not run this as root! Its already setuid!\n");
}

#
# Parse command arguments. Once we return from getopts, all that should be
# left are the required arguments.
#
%options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
if (defined($options{"d"})) {
    $debug = 1;
}
if (@ARGV != 3) {
    usage();
}
my $host = $ARGV[0];
my $user = $ARGV[1];
my $key  = $ARGV[2];

#
# Untaint args.
#
if ($host =~ /^([-\w\.]+)$/) {
    $host = $1;
}
else {
    die("Bad data in host: $host");
}
if ($user =~ /^([-\w]+)$/) {
    $user = $1;
}
else {
    die("Bad data in user: $user.");
}
if ($key =~ /^([\w]+)$/) {
    $key = $1;
}
else {
    fatal("Bad data in secretkey!");
}

# Just nfs.emulab.net or www.datapository.net for now ...
if ($host ne "nfs.emulab.net" &&
    $host ne "www.datapository.net") {
    fatal("Bad host; must be one of nfs.emulab.net or www.datapository.net!");
}

#
# For ssh.
#
$UID = $EUID;

if (system("$SSH -l $XLOGINUSER $host $XLOGINCMD $user '$key'")) {
    fatal("$XLOGINCMD failed on $host!");
}
exit(0);

sub fatal($)
{
    my($mesg) = $_[0];

    die("*** $0:\n".
	"    $mesg\n");
}