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#!/usr/bin/perl
#
# A git daemon with an added userv security boundary.
#
# This was written by Tony Finch <dot@dotat.at> and subsequently
# heavily modified by Ian Jackson <ijackson@chiark.greenend.org.uk>
# http://creativecommons.org/publicdomain/zero/1.0/
use strict;
use warnings;
use POSIX;
use Socket;
use Sys::Syslog;
BEGIN {
if ($ARGV[0] =~ s/^-L//) {
my $logfile= shift @ARGV;
open STDERR, ">> $logfile" or die $!;
}
}
sub ntoa {
my $sockaddr = shift;
return ('(local)') unless defined $sockaddr;
my ($port,$addr) = sockaddr_in $sockaddr;
$addr = inet_ntoa $addr;
return ("[$addr]:$port",$addr,$port);
}
our ($client,$client_addr,$client_port) = ntoa getpeername STDIN;
our ($server,$server_addr,$server_port) = ntoa getsockname STDIN;
our ($service,$specpath,$spechost);
printf STDERR "%s [$$] %s %s\n",
strftime("%Y-%m-%d %H:%M:%S %Z", localtime), $server, $client;
openlog 'userv-git-daemon', 'pid', 'daemon';
sub fail { syslog 'err', "$client @_"; exit }
$SIG{ALRM} = sub { fail "timeout" };
alarm 30;
sub xread {
my $length = shift;
my $buffer = "";
while ($length > length $buffer) {
my $ret = sysread STDIN, $buffer, $length, length $buffer;
fail "Expected $length bytes, got ".length $buffer
if defined $ret and $ret == 0;
fail "read: $!" if not defined $ret and $! != EINTR and $! != EAGAIN;
}
return $buffer;
}
my $hex_len = xread 4;
fail "Bad hex in packet length" unless $hex_len =~ m|^[0-9a-fA-F]{4}$|;
my $line = xread -4 + hex $hex_len;
unless (($service,$specpath,$spechost) = $line =~
m|^(git-[a-z-]+) /*([!-~]+)\0host=([!-~]+)\0$|) {
$line =~ s|[^ -~]+| |g;
fail "Could not parse \"$line\""
}
@@READ_URLMAP@@
fail "No global mapping for $uri" unless defined $serve_user;
my ($hn,$ha,$at,$naddrs,@addrs) = gethostbyname $spechost;
fail "hostname/address mismatch ($spechost $server_addr)" unless grep {
$server_addr eq inet_ntoa $_
} @addrs;
our @opts;
push @opts, "-D$_=${$::{$_}}"
for qw(service specpath spechost
client client_addr client_port
server server_addr server_port);
fail "no user $serve_user" unless getpwnam($serve_user);
syslog 'notice', "$client $service $uri $serve_user";
my @cmd = ('userv', '-t300', @opts, $serve_user, $service);
no warnings; # suppress errors to stderr
exec @cmd or fail "exec userv: $!";
# end
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