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55 lines
2.2 KiB
Perl
55 lines
2.2 KiB
Perl
#!/usr/bin/perl
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# Name: /usr/local/bin/rrsync Author: Joe Smith <js-cgi@inwap.com> 30-Sep-2004
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# Purpose: Restricts rsync to subdirectory declared in .ssh/authorized_keys
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# (should have a symlink in /usr/bin)
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use Socket;
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use constant LOGFILE => 'rrsync.log';
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my $Usage = <<EOM;
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Use 'command="$0 [-ro] subdir"'
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in front of lines in $ENV{HOME}/.ssh/authorized_keys
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EOM
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my $ro = (@ARGV and $ARGV[0] eq '-ro') ? shift : ''; # -ro = Read-Only
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my $subdir = shift;
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die "No subdirectory specified\n$Usage" unless defined $subdir;
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# The client uses "rsync -av -e ssh src/ server:dir/", and sshd on the server
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# executes this program when .ssh/authorized_keys has 'command="..."'.
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# For example:
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# command="rrsync logs/client" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAzGhEeNlPr...
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# command="rrsync -ro results" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAmkHG1WCjC...
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#
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# Format of the envrionment variables set by sshd:
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# SSH_ORIGINAL_COMMAND=rsync --server -vlogDtpr --partial . dir # push
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# SSH_ORIGINAL_COMMAND=rsync --server --sender -vlogDtpr --partial . dir # pull
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# SSH_CLIENT=client_addr client_port server_port
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my $command = $ENV{SSH_ORIGINAL_COMMAND};
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die "Not invoked via sshd\n$Usage" unless defined $command;
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my ($cmd,$dir) = $command =~ /(.* \.) ?(.*)/;
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die "SSH_ORIGINAL_COMMAND='$command' is not rsync\n" unless $cmd =~ /^rsync\s/;
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die "$0 -ro: sending to read-only directory $dir not allowed\n"
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if $ro and $cmd !~ /^rsync --server --sender /;
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my $orig = $dir;
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$dir = $subdir if $dir eq ''; # Use subdir instead of $HOME
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$dir =~ s%^/%%; # Don't allow absolute paths
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$dir = "$subdir/$dir" unless $dir eq $subdir or $dir =~ m%^\Q$subdir/%;
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$dir =~ s%/\.\.(?=/)%__%g; # Don't allow foo/../../etc
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$dir =~ tr|-_/a-zA-Z0-9.,|_|c; # Don't allow ;|][}{*?
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if (-f LOGFILE and open LOG,'>>',LOGFILE) {
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my ($mm,$hh) = (localtime)[1,2];
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my $host = $ENV{SSH_CLIENT} || 'unknown';
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$host =~ s/ .*//; # Keep only the client's IP addr
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$host = gethostbyaddr(inet_aton($host),AF_INET) || $host;
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$_ = sprintf "%-13s",$host;
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print LOG "$hh:$mm $_ [$command] =",($dir eq $orig ? " OK" : "> $dir"),"\n";
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close LOG;
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}
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exec "$cmd $dir" or die "exec($cmd $dir) failed: $? $!";
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# Note: This assumes that the rsync protocol will not be maliciously hijacked.
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