sfskey_update.in 4.63 KB
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#!/usr/bin/perl -wT
#
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# Copyright (c) 2000-2003, 2007 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 Fcntl ':flock';

#
# Create new sfs_users file and fire it off to the SFS server to
# install via the proxy perl script.
#
# This script always does the right thing, so it does not matter who calls it. 
#
# usage: sfskey_update
#

#
# Configure variables
#
my $TB		= "@prefix@";
my $TBOPS       = "@TBOPSEMAIL@";
my $TESTMODE    = @TESTMODE@;
my $FSNODE      = "@FSNODE@";

# Note no -n option. We redirect stdin from the new exports file below.
my $SSH		= "$TB/bin/sshtb -l root -host $FSNODE";
my $PROG	= "/usr/testbed/sbin/sfskey_update.proxy";
my $keyfile     = "/var/tmp/sfs_users";
my $lockfile    = "/var/tmp/testbed_sfsusers_lockfile";
my $dbg		= 1;
my @row; 

#
# We do not want to run this script unless its the real version.
#
if ($EUID != 0) {
    die("*** $0:\n".
	"    Must be root! Maybe its a development version?\n");
}
# XXX Hacky!
if (0 && $TB ne "/usr/testbed") {
    print STDERR "*** $0:\n".
	         "    Wrong version. Maybe its a development version?\n";
    #
    # Let experiment continue setting up.
    # 
    exit(0);
}

# un-taint path
$ENV{'PATH'} = '/bin:/usr/bin:/usr/sbin:/usr/local/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

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

#
# Testbed Support libraries
# 
use lib "@prefix@/lib";
use libdb;
use libtestbed;

#
# We need to serialize this script to avoid a trashed file. Use
# a dummy file in /var/tmp, opened for writing and flock'ed. 
#
if (!$TESTMODE) {
    open(LOCK, ">>$lockfile") || fatal("Couldn't open $lockfile\n");
    $count = 0;
    if (flock(LOCK, LOCK_EX|LOCK_NB) == 0) {
	#
	# If we don't get it the first time, we wait for:
	# 1) The lock to become free, in which case we do our thing
	# 2) The time on the lock to change, in which case we wait for
	#    that process to finish
	#
	my $oldlocktime = (stat(LOCK))[9];
	my $gotlock = 0;
	while (1) {
	    print "Another sfskey update running, waiting for it to finish\n";
	    if (flock(LOCK, LOCK_EX|LOCK_NB) != 0) {
		# OK, got the lock, we can do what we're supposed to
		$gotlock = 1;
		last;
	    }
	    $locktime = (stat(LOCK))[9];
	    if ($locktime != $oldlocktime) {
		$oldlocktime = $locktime;
		last;
	    }
	    if ($count++ > 20)  {
		fatal("Could not get the lock after a long time!\n");
	    }
	    sleep(1);
	}

	$count = 0;
	#
	# If we didn't get the lock, wait for the processes that did to finish
	#
	if (!$gotlock) {
	    while (1) {
		if ((stat(LOCK))[9] != $oldlocktime) {
		    exit(0);
		}
		if (flock(LOCK, LOCK_EX|LOCK_NB) != 0) {
		    close(LOCK);
		    exit(0);
		}
		if ($count++ > 20)  {
		    fatal("Process with the lock did not finish ".
			  "after a long time!\n");
		}
		sleep(1); 
	    }
	}
    }
}

#
# Perl-style touch(1)
#
my $now = time;
utime $now, $now, $lockfile;

#
# Create new keyfile.
#
if (!$TESTMODE) {
    open(KEYS, ">$keyfile")
	or fatal("Could not open $keyfile");
}
else {
    open(KEYS, ">/dev/null")
	or fatal("Could not open /dev/null");
}

#
# Grab all the keys from the DB and stick into the file.
#
my $query_result =
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    DBQueryFatal("select sfs.pubkey from users as u ".
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		 "left join user_sfskeys as sfs on sfs.uid_idx=u.uid_idx ".
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		 "where u.status='active' and u.webonly=0");
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while (my ($pubkey) = $query_result->fetchrow_array()) {
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    if (defined($pubkey)) {
	print KEYS "$pubkey\n";
    }
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}
close(KEYS);

#
# Fire the new tail file over to the fileserver to finish. We cat the file
# right into it.
#
if (!$TESTMODE) {
    print "Updating sfs keys on $FSNODE\n";
    
    #
    # Real root for ssh.
    #
    $UID = 0;

    system("$SSH $PROG < $keyfile") == 0 or
	fatal("Failed: $SSH $PROG < $keyfile: $?");

    #
    # Close the lock file. Exiting releases it, but might as well.
    #
    close(LOCK);
}

exit(0);

sub fatal {
    local($msg) = $_[0];

    SENDMAIL($TBOPS, "SFS key update failed", $msg);
    die("*** $0:\n".
	"    $msg\n");
}