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Файловый менеджер - Редактировать - /usr/bin/rrsync

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#!/usr/bin/perl # Name: /usr/local/bin/rrsync (should also have a symlink in /usr/bin) # 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> use strict; 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\|-wo] SUBDIR"' in front of lines in $ENV{HOME}/.ssh/authorized_keys EOM # Handle the -ro and -wo options. our $only = ''; while (@ARGV && $ARGV[0] =~ /^-([rw])o$/) { my $r_or_w = $1; if ($only && $only ne $r_or_w) { die "$0: the -ro and -wo options conflict.\n"; } $only = $r_or_w; shift; } our $subdir = shift; 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}; 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/; our $am_sender = $command =~ /^--server\s+--sender\s/; # Restrictive on purpose! die "$0 sending to read-only server not allowed\n" if $only eq 'r' && !$am_sender; die "$0 reading from write-only server not allowed\n" if $only eq 'w' && $am_sender; ### START of options data produced by the cull_options script. ### # These options are the only options that rsync might send to the server, # and only in the option format that the stock rsync produces. # To disable a short-named option, add its letter to this string: our $short_disabled = 's'; our $short_no_arg = 'ACDEHIJKLORSWXbcdgklmnoprstuvxyz'; # DO NOT REMOVE ANY our $short_with_num = 'B'; # DO NOT REMOVE ANY # To disable a long-named option, change its value to a -1. The values mean: # 0 = the option has no arg; 1 = the arg doesn't need any checking; 2 = only # check the arg when receiving; and 3 = always check the arg. our %long_opt = ( 'append' => 0, 'backup-dir' => 2, 'block-size' => 1, 'bwlimit' => 1, 'checksum-seed' => 1, 'compare-dest' => 2, 'compress-level' => 1, 'copy-dest' => 2, 'copy-unsafe-links' => 0, 'daemon' => -1, 'debug' => 1, 'delay-updates' => 0, 'delete' => 0, 'delete-after' => 0, 'delete-before' => 0, 'delete-delay' => 0, 'delete-during' => 0, 'delete-excluded' => 0, 'delete-missing-args' => 0, 'existing' => 0, 'fake-super' => 0, 'files-from' => 3, 'force' => 0, 'from0' => 0, 'fuzzy' => 0, 'group' => 0, 'groupmap' => 1, 'hard-links' => 0, 'iconv' => 1, 'ignore-errors' => 0, 'ignore-existing' => 0, 'ignore-missing-args' => 0, 'ignore-times' => 0, 'info' => 1, 'inplace' => 0, 'link-dest' => 2, 'links' => 0, 'list-only' => 0, 'log-file' => 3, 'log-format' => 1, 'max-delete' => 1, 'max-size' => 1, 'min-size' => 1, 'modify-window' => 1, 'new-compress' => 0, 'no-implied-dirs' => 0, 'no-r' => 0, 'no-relative' => 0, 'no-specials' => 0, 'numeric-ids' => 0, 'one-file-system' => 0, 'only-write-batch' => 1, 'owner' => 0, 'partial' => 0, 'partial-dir' => 2, 'perms' => 0, 'preallocate' => 0, 'recursive' => 0, 'remove-sent-files' => $only eq 'r' ? -1 : 0, 'remove-source-files' => $only eq 'r' ? -1 : 0, 'safe-links' => 0, 'sender' => 0, 'server' => 0, 'size-only' => 0, 'skip-compress' => 1, 'specials' => 0, 'stats' => 0, 'suffix' => 1, 'super' => 0, 'temp-dir' => 2, 'timeout' => 1, 'times' => 0, 'use-qsort' => 0, 'usermap' => 1, ); ### END of options data produced by the cull_options script. ### if ($short_disabled ne '') { $short_no_arg =~ s/[$short_disabled]//go; $short_with_num =~ s/[$short_disabled]//go; } $short_no_arg = "[$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 = ''; my $check_type; while ($command =~ /((?:[^\s\\]+\|\\.[^\s\\])+)/g) { $_ = $1; if ($check_type) { push(@opts, check_arg($last_opt, $_, $check_type)); $check_type = 0; } elsif ($in_options) { push(@opts, $_); if ($_ eq '.') { $in_options = 0; } else { die "$0: invalid option: '-'\n" if $_ eq '-'; next if /^-$short_no_arg(e\d\.\w)?$/o \|\| /^-$short_with_num\d+$/o; my($opt,$arg) = /^--([^=]+)(?:=(.))?$/; my $disabled; if (defined $opt) { my $ct = $long_opt{$opt}; last unless defined $ct; next if $ct == 0; if ($ct > 0) { if (!defined $arg) { $check_type = $ct; $last_opt = $opt; next; } $arg = check_arg($opt, $arg, $ct); $opts[-1] =~ s/=./=$arg/; next; } $disabled = 1; $opt = "--$opt"; } elsif ($short_disabled ne '') { $disabled = /^-$short_no_arg([$short_disabled])/o; $opt = "-$1"; } last unless $disabled; # Generate generic failure die "$0: option $opt has been disabled on this server.\n"; } } else { if ($subdir ne '/') { # Validate args to ensure they don't try to leave our restricted dir. s{//+}{/}g; s{^/}{}; s{^$}{.}; die "$0: do not use .. in any path!\n" if m{(^\|/)\\?\.\\?\.(\\?/\|$)}; } push(@args, bsd_glob($_, GLOB_LIMIT\|GLOB_NOCHECK\|GLOB_BRACE\|GLOB_QUOTE)); } } 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: $? $!"; sub check_arg { my($opt, $arg, $type) = @_; $arg =~ s/\\(.)/$1/g; if ($subdir ne '/' && ($type == 3 \|\| ($type == 2 && !$am_sender))) { $arg =~ s{//}{/}g; die "Do not use .. in --$opt; anchor the path at the root of your restricted dir.\n" if $arg =~ m{(^\|/)\.\.(/\|$)}; $arg =~ s{^/}{$subdir/}; } $arg; }

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