1: #!/usr/bin/perl
2: # Name: /usr/local/bin/rrsync (should also have a symlink in /usr/bin)
3: # Purpose: Restricts rsync to subdirectory declared in .ssh/authorized_keys
4: # Author: Joe Smith <js-cgi@inwap.com> 30-Sep-2004
5: # Modified by: Wayne Davison <wayned@samba.org>
6: use strict;
7:
8: use Socket;
9: use Cwd 'abs_path';
10: use File::Glob ':glob';
11:
12: # You may configure these values to your liking. See also the section
13: # of options if you want to disable any options that rsync accepts.
14: use constant RSYNC => '/usr/bin/rsync';
15: use constant LOGFILE => 'rrsync.log';
16:
17: my $Usage = <<EOM;
18: Use 'command="$0 [-ro] SUBDIR"'
19: in front of lines in $ENV{HOME}/.ssh/authorized_keys
20: EOM
21:
22: our $ro = (@ARGV && $ARGV[0] eq '-ro') ? shift : ''; # -ro = Read-Only
23: our $subdir = shift;
24: die "$0: No subdirectory specified\n$Usage" unless defined $subdir;
25: $subdir = abs_path($subdir);
26: die "$0: Restricted directory does not exist!\n" if $subdir ne '/' && !-d $subdir;
27:
28: # The client uses "rsync -av -e ssh src/ server:dir/", and sshd on the server
29: # executes this program when .ssh/authorized_keys has 'command="..."'.
30: # For example:
31: # command="rrsync logs/client" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAzGhEeNlPr...
32: # command="rrsync -ro results" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAmkHG1WCjC...
33: #
34: # Format of the envrionment variables set by sshd:
35: # SSH_ORIGINAL_COMMAND=rsync --server -vlogDtpr --partial . ARG # push
36: # SSH_ORIGINAL_COMMAND=rsync --server --sender -vlogDtpr --partial . ARGS # pull
37: # SSH_CONNECTION=client_addr client_port server_port
38:
39: my $command = $ENV{SSH_ORIGINAL_COMMAND};
40: die "$0: Not invoked via sshd\n$Usage" unless defined $command;
41: die "$0: SSH_ORIGINAL_COMMAND='$command' is not rsync\n" unless $command =~ s/^rsync\s+//;
42: die "$0: --server option is not first\n" unless $command =~ /^--server\s/;
43: our $am_sender = $command =~ /^--server\s+--sender\s/; # Restrictive on purpose!
44: die "$0 -ro: sending to read-only server not allowed\n" if $ro && !$am_sender;
45:
46: ### START of options data produced by the cull_options script. ###
47:
48: # These options are the only options that rsync might send to the server,
49: # and only in the option format that the stock rsync produces.
50:
51: # To disable a short-named option, add its letter to this string:
52: our $short_disabled = 's';
53:
54: our $short_no_arg = 'ACDEHIKLORSWXbcdgklmnoprstuvxz'; # DO NOT REMOVE ANY
55: our $short_with_num = 'B'; # DO NOT REMOVE ANY
56:
57: # To disable a long-named option, change its value to a -1. The values mean:
58: # 0 = the option has no arg; 1 = the arg doesn't need any checking; 2 = only
59: # check the arg when receiving; and 3 = always check the arg.
60: our %long_opt = (
61: 'append' => 0,
62: 'backup-dir' => 2,
63: 'bwlimit' => 1,
64: 'checksum-seed' => 1,
65: 'compare-dest' => 2,
66: 'compress-level' => 1,
67: 'copy-dest' => 2,
68: 'copy-unsafe-links' => 0,
69: 'daemon' => -1,
70: 'delay-updates' => 0,
71: 'delete' => 0,
72: 'delete-after' => 0,
73: 'delete-before' => 0,
74: 'delete-delay' => 0,
75: 'delete-during' => 0,
76: 'delete-excluded' => 0,
77: 'existing' => 0,
78: 'fake-super' => 0,
79: 'files-from' => 3,
80: 'force' => 0,
81: 'from0' => 0,
82: 'fuzzy' => 0,
83: 'iconv' => 1,
84: 'ignore-errors' => 0,
85: 'ignore-existing' => 0,
86: 'inplace' => 0,
87: 'link-dest' => 2,
88: 'list-only' => 0,
89: 'log-file' => 3,
90: 'log-format' => 1,
91: 'max-delete' => 1,
92: 'max-size' => 1,
93: 'min-size' => 1,
94: 'modify-window' => 1,
95: 'no-implied-dirs' => 0,
96: 'no-r' => 0,
97: 'no-relative' => 0,
98: 'no-specials' => 0,
99: 'numeric-ids' => 0,
100: 'only-write-batch' => 1,
101: 'partial' => 0,
102: 'partial-dir' => 2,
103: 'remove-sent-files' => $ro ? -1 : 0,
104: 'remove-source-files' => $ro ? -1 : 0,
105: 'safe-links' => 0,
106: 'sender' => 0,
107: 'server' => 0,
108: 'size-only' => 0,
109: 'skip-compress' => 1,
110: 'specials' => 0,
111: 'stats' => 0,
112: 'suffix' => 1,
113: 'super' => 0,
114: 'temp-dir' => 2,
115: 'timeout' => 1,
116: 'use-qsort' => 0,
117: );
118:
119: ### END of options data produced by the cull_options script. ###
120:
121: if ($short_disabled ne '') {
122: $short_no_arg =~ s/[$short_disabled]//go;
123: $short_with_num =~ s/[$short_disabled]//go;
124: }
125: $short_no_arg = "[$short_no_arg]" if length($short_no_arg) > 1;
126: $short_with_num = "[$short_with_num]" if length($short_with_num) > 1;
127:
128: my $write_log = -f LOGFILE && open(LOG, '>>', LOGFILE);
129:
130: chdir($subdir) or die "$0: Unable to chdir to restricted dir: $!\n";
131:
132: my(@opts, @args);
133: my $in_options = 1;
134: my $last_opt = '';
135: my $check_type;
136: while ($command =~ /((?:[^\s\\]+|\\.[^\s\\]*)+)/g) {
137: $_ = $1;
138: if ($check_type) {
139: push(@opts, check_arg($last_opt, $_, $check_type));
140: $check_type = 0;
141: } elsif ($in_options) {
142: push(@opts, $_);
143: if ($_ eq '.') {
144: $in_options = 0;
145: } else {
146: die "$0: invalid option: '-'\n" if $_ eq '-';
147: next if /^-$short_no_arg*(e\d*\.\w*)?$/o || /^-$short_with_num\d+$/o;
148:
149: my($opt,$arg) = /^--([^=]+)(?:=(.*))?$/;
150: my $disabled;
151: if (defined $opt) {
152: my $ct = $long_opt{$opt};
153: last unless defined $ct;
154: next if $ct == 0;
155: if ($ct > 0) {
156: if (!defined $arg) {
157: $check_type = $ct;
158: $last_opt = $opt;
159: next;
160: }
161: $arg = check_arg($opt, $arg, $ct);
162: $opts[-1] =~ s/=.*/=$arg/;
163: next;
164: }
165: $disabled = 1;
166: $opt = "--$opt";
167: } elsif ($short_disabled ne '') {
168: $disabled = /^-$short_no_arg*([$short_disabled])/o;
169: $opt = "-$1";
170: }
171:
172: last unless $disabled; # Generate generic failure
173: die "$0: option $opt has been disabled on this server.\n";
174: }
175: } else {
176: if ($subdir ne '/') {
177: # Validate args to ensure they don't try to leave our restricted dir.
178: s{//+}{/}g;
179: s{^/}{};
180: s{^$}{.};
181: die "$0: do not use .. in any path!\n" if m{(^|/)\\?\.\\?\.(\\?/|$)};
182: }
183: push(@args, bsd_glob($_, GLOB_LIMIT|GLOB_NOCHECK|GLOB_BRACE|GLOB_QUOTE));
184: }
185: }
186: die "$0: invalid rsync-command syntax or options\n" if $in_options;
187:
188: @args = ( '.' ) if !@args;
189:
190: if ($write_log) {
191: my ($mm,$hh) = (localtime)[1,2];
192: my $host = $ENV{SSH_CONNECTION} || 'unknown';
193: $host =~ s/ .*//; # Keep only the client's IP addr
194: $host =~ s/^::ffff://;
195: $host = gethostbyaddr(inet_aton($host),AF_INET) || $host;
196: printf LOG "%02d:%02d %-13s [%s]\n", $hh, $mm, $host, "@opts @args";
197: close LOG;
198: }
199:
200: # Note: This assumes that the rsync protocol will not be maliciously hijacked.
201: exec(RSYNC, @opts, @args) or die "exec(rsync @opts @args) failed: $? $!";
202:
203: sub check_arg
204: {
205: my($opt, $arg, $type) = @_;
206: $arg =~ s/\\(.)/$1/g;
207: if ($subdir ne '/' && ($type == 3 || ($type == 2 && !$am_sender))) {
208: $arg =~ s{//}{/}g;
209: die "Do not use .. in --$opt; anchor the path at the root of your restricted dir.\n"
210: if $arg =~ m{(^|/)\.\.(/|$)};
211: $arg =~ s{^/}{$subdir/};
212: }
213: $arg;
214: }
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