Convert README to markdown

[schsh.git] / schsh-rrsync

diff --git a/schsh-rrsync b/schsh-rrsync
old mode 100755 (executable)
new mode 100644 (file)
index bb51629..9542636
--- a/schsh-rrsync
+++ b/schsh-rrsync
@@ -3,16 +3,40 @@
 # Purpose: Restricts rsync to subdirectory declared in .ssh/authorized_keys
 # Author: Joe Smith <js-cgi@inwap.com> 30-Sep-2004
 # Modified by: Wayne Davison <wayned@samba.org>
+
+# Modified by: Ralf Jung <post@ralfj.de>
+# This file is taken from the Debian rsync package, where it resides in
+# </usr/share/doc/rsync/scripts/rrsync.gz>. According to the Debian package
+# copyright information, it is available under GPL-3. Quoting from that information:
+# > COPYRIGHT
+# > ---------
+# > 
+# > Copyright (C) 1996-2011 by Andrew Tridgell, Wayne Davison, and others.
+# > 
+# > Rsync was originally written by Andrew Tridgell and is currently
+# > maintained by Wayne Davison.  It has been improved by many developers
+# > from around the world.
+# > 
+# > Rsync may be used, modified and redistributed only under the terms of
+# > the GNU General Public License, found in the file:
+# > 
+# >   /usr/share/common-licenses/GPL-3
+# > 
+# > on Debian systems, or at 
+# > 
+# >   http://www.fsf.org/licensing/licenses/gpl.html
+# You can also find the license text of GPL-3 in the LICENSE-GPL3 file that
+# comes with schsh.
+
 use strict;
 
-use Socket;
+# use Socket;
 use Cwd 'abs_path';
 use File::Glob ':glob';
 
 # You may configure these values to your liking.  See also the section
 # of options if you want to disable any options that rsync accepts.
 use constant RSYNC => '/usr/bin/rsync';
-use constant LOGFILE => 'rrsync.log';
 
 my $Usage = <<EOM;
 Use 'command="$0 [-ro] SUBDIR"'
@@ -25,18 +49,13 @@ die "$0: No subdirectory specified\n$Usage" unless defined $subdir;
 $subdir = abs_path($subdir);
 die "$0: Restricted directory does not exist!\n" if $subdir ne '/' && !-d $subdir;
 
-# The client uses "rsync -av -e ssh src/ server:dir/", and sshd on the server
-# executes this program when .ssh/authorized_keys has 'command="..."'.
-# For example:
-# command="rrsync logs/client" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAzGhEeNlPr...
-# command="rrsync -ro results" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAmkHG1WCjC...
-#
-# Format of the environment variables set by sshd:
-# SSH_ORIGINAL_COMMAND=rsync --server          -vlogDtpr --partial . ARG # push
-# SSH_ORIGINAL_COMMAND=rsync --server --sender -vlogDtpr --partial . ARGS # pull
-# SSH_CONNECTION=client_addr client_port server_port
-
-my $command = $ENV{SSH_ORIGINAL_COMMAND};
+# The client uses "rsync -av -e ssh src/ server:dir/", and schsh makes the entire rsync call
+# the third argument to rrsnc: rrsync (-ro)? SUBDIR COMMAND
+# Format of the COMMAND:
+# COMMAND=rsync --server          -vlogDtpr --partial . ARG # push
+# COMMAND=rsync --server --sender -vlogDtpr --partial . ARGS # pull
+
+my $command = shift;
 die "$0: Not invoked via sshd\n$Usage" unless defined $command;
 die "$0: SSH_ORIGINAL_COMMAND='$command' is not rsync\n" unless $command =~ s/^rsync\s+//;
 die "$0: --server option is not first\n" unless $command =~ /^--server\s/;
@@ -129,10 +148,6 @@ if ($short_disabled ne '') {
 $short_no_arg = "[$short_no_arg]" if length($short_no_arg) > 1;
 $short_with_num = "[$short_with_num]" if length($short_with_num) > 1;
 
-my $write_log = -f LOGFILE && open(LOG, '>>', LOGFILE);
-
-chdir($subdir) or die "$0: Unable to chdir to restricted dir: $!\n";
-
 my(@opts, @args);
 my $in_options = 1;
 my $last_opt = '';
@@ -191,16 +206,6 @@ die "$0: invalid rsync-command syntax or options\n" if $in_options;
 
 @args = ( '.' ) if !@args;
 
-if ($write_log) {
-  my ($mm,$hh) = (localtime)[1,2];
-  my $host = $ENV{SSH_CONNECTION} || 'unknown';
-  $host =~ s/ .*//; # Keep only the client's IP addr
-  $host =~ s/^::ffff://;
-  $host = gethostbyaddr(inet_aton($host),AF_INET) || $host;
-  printf LOG "%02d:%02d %-13s [%s]\n", $hh, $mm, $host, "@opts @args";
-  close LOG;
-}
-
 # Note: This assumes that the rsync protocol will not be maliciously hijacked.
 exec(RSYNC, @opts, @args) or die "exec(rsync @opts @args) failed: $? $!";