Commit | Line | Data |
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d2707bea TF |
1 | #!/usr/bin/perl |
2 | # | |
fbde0914 | 3 | # A git daemon with an added userv security boundary. |
d2707bea | 4 | # |
d36c5f7b IJ |
5 | # This was written by Tony Finch <dot@dotat.at> and subsequently |
6 | # heavily modified by Ian Jackson <ijackson@chiark.greenend.org.uk> | |
d2707bea TF |
7 | # http://creativecommons.org/publicdomain/zero/1.0/ |
8 | ||
9 | use strict; | |
10 | use warnings; | |
11 | ||
12 | use POSIX; | |
fbde0914 TF |
13 | use Socket; |
14 | use Sys::Syslog; | |
d2707bea | 15 | |
70b9d2e0 IJ |
16 | BEGIN { |
17 | if ($ARGV[0] =~ s/^-L//) { | |
18 | my $logfile= shift @ARGV; | |
19 | open STDERR, ">> $logfile" or die $!; | |
20 | } | |
21 | } | |
22 | ||
6fe98f4a TF |
23 | sub ntoa { |
24 | my $sockaddr = shift; | |
9ad7f5ed | 25 | return ('(local)') unless defined $sockaddr; |
18c4999f TF |
26 | my ($port,$addr) = sockaddr_in $sockaddr; |
27 | $addr = inet_ntoa $addr; | |
28 | return ("[$addr]:$port",$addr,$port); | |
29 | } | |
9ad7f5ed TF |
30 | our ($client,$client_addr,$client_port) = ntoa getpeername STDIN; |
31 | our ($server,$server_addr,$server_port) = ntoa getsockname STDIN; | |
d36c5f7b | 32 | our ($service,$specpath,$spechost); |
6fe98f4a | 33 | |
70b9d2e0 IJ |
34 | printf STDERR "%s [$$] %s %s\n", |
35 | strftime("%Y-%m-%d %H:%M:%S %Z", localtime), $server, $client; | |
36 | ||
fbde0914 | 37 | openlog 'userv-git-daemon', 'pid', 'daemon'; |
3b32ef57 | 38 | sub fail { syslog 'err', "$client @_"; exit } |
d2707bea | 39 | |
9ad7f5ed TF |
40 | $SIG{ALRM} = sub { fail "timeout" }; |
41 | alarm 30; | |
42 | ||
d2707bea | 43 | sub xread { |
5f3e811b TF |
44 | my $length = shift; |
45 | my $buffer = ""; | |
46 | while ($length > length $buffer) { | |
47 | my $ret = sysread STDIN, $buffer, $length, length $buffer; | |
48 | fail "Expected $length bytes, got ".length $buffer | |
abb80356 TF |
49 | if defined $ret and $ret == 0; |
50 | fail "read: $!" if not defined $ret and $! != EINTR and $! != EAGAIN; | |
d2707bea | 51 | } |
5f3e811b | 52 | return $buffer; |
d2707bea | 53 | } |
5f3e811b TF |
54 | my $hex_len = xread 4; |
55 | fail "Bad hex in packet length" unless $hex_len =~ m|^[0-9a-fA-F]{4}$|; | |
56 | my $line = xread -4 + hex $hex_len; | |
d36c5f7b | 57 | unless (($service,$specpath,$spechost) = $line =~ |
9ad7f5ed | 58 | m|^(git-[a-z-]+) /*([!-~]+)\0host=([!-~]+)\0$|) { |
5f3e811b TF |
59 | $line =~ s|[^ -~]+| |g; |
60 | fail "Could not parse \"$line\"" | |
fbde0914 | 61 | } |
6fe98f4a | 62 | |
d36c5f7b IJ |
63 | @@READ_URLMAP@@ |
64 | ||
70b9d2e0 | 65 | fail "No global mapping for $uri" unless defined $serve_user; |
d36c5f7b | 66 | |
70b9d2e0 IJ |
67 | my ($hn,$ha,$at,$naddrs,@addrs) = gethostbyname $spechost; |
68 | fail "hostname/address mismatch ($spechost $server_addr)" unless grep { | |
d36c5f7b IJ |
69 | $server_addr eq inet_ntoa $_ |
70 | } @addrs; | |
3b32ef57 | 71 | |
70b9d2e0 IJ |
72 | our @opts; |
73 | ||
74 | push @opts, "-D$_=${$::{$_}}" | |
75 | for qw(service specpath spechost | |
76 | client client_addr client_port | |
77 | server server_addr server_port); | |
78 | ||
79 | fail "no user $serve_user" unless getpwnam($serve_user); | |
80 | ||
81 | syslog 'notice', "$client $service $uri $serve_user"; | |
fbde0914 | 82 | |
70b9d2e0 | 83 | my @cmd = ('userv', '-t300', @opts, $serve_user, $service); |
11b88dbb | 84 | no warnings; # suppress errors to stderr |
9ad7f5ed | 85 | exec @cmd or fail "exec userv: $!"; |
fbde0914 TF |
86 | |
87 | # end |