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add option to drop privs #19

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add option to drop privs #19

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37 changes: 37 additions & 0 deletions perlbal
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Original file line number Diff line number Diff line change
Expand Up @@ -39,12 +39,14 @@ my $opt_daemonize;
my $opt_config;
my $opt_help;
my $opt_version;
my $opt_drop_privs = [];
usage(1) unless
Getopt::Long::GetOptions(
'daemon' => \$opt_daemonize,
'config=s' => \$opt_config,
'help' => \$opt_help,
'version' => \$opt_version,
'drop-privs=s' => $opt_drop_privs,
);

my $default_config = "/etc/perlbal/perlbal.conf";
Expand All @@ -61,6 +63,8 @@ Usage: perlbal [OPTS]
--config=[file] Specify Perlbal config file
(default: /etc/perlbal/perlbal.conf)
--daemon Daemonize
--drop-privs=<uid|user>[,gid|group] Drop effective privileges.
(gid is optional)
USAGE

exit($rv);
Expand All @@ -71,6 +75,12 @@ if ($opt_version) {
exit 0;
}

if ( @$opt_drop_privs && $< != 0 ) {
# real uid isn't root
print STDERR "Can't drop privileges if not run with root privileges first!\n\n";
usage(1);
}

# load user config
if ($opt_config && ! Perlbal::load_config($opt_config, sub { print STDOUT "$_[0]\n"; })) {
die "Error starting up.\n";
Expand All @@ -94,9 +104,36 @@ if ($opt_daemonize) {
print "Running.\n";
}

if ( @$opt_drop_privs ) {
my ( $uid, $gid ) = split( ',', join( ',', @$opt_drop_privs ) );
# not a number, resolve by user name
if ( $uid !~ m/^\d+$/ ) {
my $u = getpwnam( $uid );
die "unknown user: $uid! You could try using the uid instead"
unless( defined( $u ) );
$uid = $u;
}
# not a number, resolve by group name
if ( defined( $gid ) && $gid !~ m/^\d+$/ ) {
my $g = getgrnam( $gid );
die "unknown group: $gid! You could try using the gid instead"
unless( defined( $g ) );
$gid = $g;
}

# drop the group first, then the user
set_egid( $gid ) if defined( $gid );
set_euid( $uid ) if ( $uid );
print "Dropped privileges to $uid".( defined( $gid ) ? ":$gid" : '' )."\n";
}

exit 0 if Perlbal::run();
exit 1;

# util functions to
sub set_euid { $> = $_[ 0 ]; die "could not set the effective uid: $_[ 0 ]" unless( $_[ 0 ] == $> ); }
sub set_egid { $) = $_[ 0 ]; die "could not set the effective gid: $_[ 0 ]" unless( $_[ 0 ] == $) ); }

# Local Variables:
# mode: perl
# c-basic-indent: 4
Expand Down