X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/985af7035eff604bf739d0bbf14bd1b601c9a16e..bd685982389b78a158921b7839bdeca501338d19:/support/rrsync

diff --git a/support/rrsync b/support/rrsync
index b3a02544..e3c5d41a 100644
--- a/support/rrsync
+++ b/support/rrsync
@@ -8,8 +8,12 @@ use strict;
 use Socket;
 use Cwd 'abs_path';
 use File::Glob ':glob';
-use constant RSYNC => 'rsync'; # Optionally set the path of rsync here.
+
+# 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"'
 	in front of lines in $ENV{HOME}/.ssh/authorized_keys
@@ -19,7 +23,7 @@ our $ro = (@ARGV && $ARGV[0] eq '-ro') ? shift : '';	# -ro = Read-Only
 our $subdir = shift;
 die "$0: No subdirectory specified\n$Usage" unless defined $subdir;
 $subdir = abs_path($subdir);
-die "$0: Restricted subdirectory does not exist!\n" if $subdir ne '/' && !-d $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="..."'.
@@ -35,149 +39,162 @@ die "$0: Restricted subdirectory does not exist!\n" if $subdir ne '/' && !-d $su
 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 -ro: sending to read-only server not allowed\n" if $ro && !$am_sender;
 
-### START of options data produced by the cull-options script. ###
+### 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.
 
-# These options are the only options that rsync might send to the
-# server, and only in the arg styles that the stock rsync produces.
-our $short_no_arg = 'CDHIKLORSWbcdglnoprtuvxz';
-our $short_with_num = 'B';
 # To disable a short-named option, add its letter to this string:
-our $short_disabled = '';
-# To disable a long-named option, change its value to a 0.  A value of -1
-# means the arg doesn't need checking, a 2 means only check when receiving.
-our %long_no_arg = (
-  'copy-unsafe-links' => -1,
-  'daemon' => -1,
-  'delay-updates' => -1,
-  'delete' => -1,
-  'delete-after' => -1,
-  'delete-before' => -1,
-  'delete-during' => -1,
-  'delete-excluded' => -1,
-  'existing' => -1,
-  'force' => -1,
-  'from0' => -1,
-  'fuzzy' => -1,
-  'ignore-errors' => -1,
-  'ignore-existing' => -1,
-  'inplace' => -1,
-  'list-only' => -1,
-  'no-implied-dirs' => -1,
-  'no-relative' => -1,
-  'numeric-ids' => -1,
-  'partial' => -1,
-  'remove-sent-files' => $ro ? 0 : -1,
-  'safe-links' => -1,
-  'sender' => -1,
-  'server' => -1,
-  'size-only' => -1,
-);
-our %long_with_arg = (
-  'bwlimit' => -1,
-  'checksum-seed' => -1,
-  'files-from' => 1,
-  'log-format' => -1,
-  'max-delete' => -1,
-  'modify-window' => -1,
-  'only-write-batch' => -1,
-  'suffix' => -1,
-  'timeout' => -1,
-);
-our %long_before_arg = (
+our $short_disabled = 's';
+
+our $short_no_arg = 'ACDEHIKLORSWXbcdgklmnoprstuvxz'; # 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,
-  'files-from' => 1,
-  'max-size' => -1,
+  'bwlimit' => 1,
+  'checksum-seed' => 1,
+  'compare-dest' => 2,
+  'compress-level' => 1,
+  'copy-dest' => 2,
+  'copy-unsafe-links' => 0,
+  'daemon' => -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,
+  'groupmap' => 1,
+  'iconv' => 1,
+  'ignore-errors' => 0,
+  'ignore-existing' => 0,
+  'ignore-missing-args' => 0,
+  'inplace' => 0,
+  'link-dest' => 2,
+  'list-only' => 0,
+  'log-file' => 3,
+  'log-format' => 1,
+  'max-delete' => 1,
+  'max-size' => 1,
+  'min-size' => 1,
+  'modify-window' => 1,
+  'no-implied-dirs' => 0,
+  'no-r' => 0,
+  'no-relative' => 0,
+  'no-specials' => 0,
+  'numeric-ids' => 0,
+  'only-write-batch' => 1,
+  'partial' => 0,
   'partial-dir' => 2,
+  'remove-sent-files' => $ro ? -1 : 0,
+  'remove-source-files' => $ro ? -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,
+  'use-qsort' => 0,
+  'usermap' => 1,
 );
 
-### END of options data produced by the cull-options script. ###
+### 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;
-foreach (split(/(?<!\\)\s+/, $command)) {
+while ($command =~ /((?:[^\s\\]+|\\.[^\s\\]*)+)/g) {
+  $_ = $1;
   if ($check_type) {
-    s/\\(.)/$1/g;
     push(@opts, check_arg($last_opt, $_, $check_type));
     $check_type = 0;
   } elsif ($in_options) {
-    s/\\(.)/$1/g;
     push(@opts, $_);
     if ($_ eq '.') {
       $in_options = 0;
     } else {
-      next if /^-[$short_no_arg]+$/o || /^-[$short_with_num]\d+$/o;
+      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 $arg) {
-	my $ct = $long_with_arg{$opt};
-	if ($ct) {
-	  $arg = check_arg($opt, $arg, $ct);
-	  $opts[-1] =~ s/=.*/=$arg/;
-	  next;
-	}
-	$disabled = defined $long_with_arg{$opt};
-	$opt = "--$opt";
-      } elsif (defined $opt) {
-	if (defined $long_no_arg{$opt}) {
-	  next if $long_no_arg{$opt};
-	  $disabled = 1;
-	} else {
-	  $check_type = $long_before_arg{$opt};
-	  if ($check_type) {
+      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;
 	  }
-	  $disabled = defined $check_type;
+	  $arg = check_arg($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" if $disabled;
+	$disabled = /^-$short_no_arg*([$short_disabled])/o;
+	$opt = "-$1";
       }
 
-      die "$0: option $opt has been disabled on this server.\n" if $disabled;
-      die "$0: invalid rsync-command syntax or options\n";
+      last unless $disabled; # Generate generic failure
+      die "$0: option $opt has been disabled on this server.\n";
     }
   } else {
-    push(@args, $_);
-  }
-}
-
-my $write_log = -f LOGFILE && open(LOG, '>>', LOGFILE);
-
-chdir($subdir) or die "$0: Unable to chdir to $subdir: $!\n";
-
-# Validate args to ensure they don't try to leave our restricted dir.
-if ($subdir ne '/') {
-  my @new;
-  foreach (@args) {
-    s#//+#/#g;
-    s#^/##;
-    s#^$#.#;
-    die "Do not use .. in any path!\n" if m#(^|/)\\?\.\\?\.(\\?/|$)#;
-    push(@new, bsd_glob($_, GLOB_LIMIT|GLOB_NOCHECK|GLOB_BRACE|GLOB_QUOTE));
+    if ($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));
   }
-  @args = @new;
 }
+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/ .*//; # 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";
@@ -190,11 +207,12 @@ exec(RSYNC, @opts, @args) or die "exec(rsync @opts @args) failed: $? $!";
 sub check_arg
 {
   my($opt, $arg, $type) = @_;
-  if ($subdir ne '/' && $type > 0 && ($type < 2 || !$am_sender)) {
-    $arg =~ s#//#/#g;
+  $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/#;
+      if $arg =~ m{(^|/)\.\.(/|$)};
+    $arg =~ s{^/}{$subdir/};
   }
   $arg;
 }