/usr/lib/cgi-bin/dwww is in dwww 1.11.7.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | #!/usr/bin/perl -T
# vim:ft=perl:cindent:ts=4:sts=4:sw=4:et:fdm=marker:cms=\ #\ %s
#
# IF YOU SEE THIS TEXT
# PLEASE MAKE SURE YOUR WEB SERVER
# HAS THE CGI SUPPORT ENABLED
# (if you are using apache2, please run `a2enmod cgi')
#
# $Id: dwww.cgi 547 2011-01-15 15:29:55Z robert $
#
$doc2html = '/usr/sbin/dwww-convert'; # Document-to-HTML converter
$search2html = '/usr/sbin/dwww-find'; # Search and output results as HTML
@searchargs = ('--package'); # Default argument for $search2html
$ENV{PATH} = '/bin:/usr/bin:/usr/sbin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'}; # Delete unsafe variables
$TRUE = 1;
$FALSE = 0;
&ReadParse(); # Get CGI info (see below for function)
#
# Figure out if this is a multiple word search or a straight request.
# If the former, split it on commas (,).
#
if ($in{'search'} ne '') {
$search = $TRUE;
@searchstring = split(/,/, $in{'search'});
if ($in{'searchtype'} eq 'm') {
@searchargs = ('--menu');
}
elsif ($in{'searchtype'} eq 'f') {
@searchargs = ('--docfile');
}
elsif ($in{'searchtype'} eq 'b') {
@searchargs = ('--doc-base-list');
}
elsif ($in{'searchtype'} eq 'd') {
@searchargs = ('--documentation');
if (defined $in{'skip'}) {
push(@searchargs, "--skip=$in{'skip'}");
}
}
push(@searchargs, "--");
}
else {
$search = $FALSE;
$type = $in{'type'}; # This document is formated in $type.
$type = 'file' unless defined $type;
$location = $in{'location'}; # It is located at $location.
$no_pi = '--no-path-info';
if ($location eq "") {
&CheckForBrokenThttpd() if $type eq "dir";
$location = $in{'path_info'};
$no_pi = '';
}
}
sub CheckForBrokenThttpd() {
if ($ENV{'SCRIPT_NAME'} =~ m/\/$/ &&
$ENV{'SERVER_SOFTWARE'} =~ m/thttpd/) {
&error ($TRUE, "Your webserver is broken... See <A href=\"http://bugs.debian.org/164306>Bug#164306</A>. ");
}
}
#
# Ok, now that we know the type, we need to perform the search or
# send them the requested document.
#
if ($search == $TRUE) {
exec { "$search2html" } "$search2html", @searchargs, @searchstring;
&error($TRUE, "Couldn't search for @searchstring! ($!)");
}
elsif (($type eq "") or ($location eq "")) {
my $port = $ENV{'SERVER_PORT'} ? ':' . $ENV{'SERVER_PORT'} : '';
my $protocol = ($ENV{'HTTPS'} and $ENV{'HTTPS'} eq "on") ? "https" : "http";
print "Location: $protocol://$ENV{'SERVER_NAME'}$port/dwww/\n\n";
}
else {
# Execute $doc2html, telling it that the format is of type $type, and the
# requested document at $location.
my @args = ("--", $type, $location);
unshift (@args, $no_pi) if $no_pi ne '';
exec { $doc2html } $doc2html, @args;
&error($TRUE, "Couldn't convert document $location! ($!)");
}
###############################################################################
# ReadParse() -- read in the data passed from the HTML form that called me.
###############################################################################
sub ReadParse {
if (@_) {
local (*in) = @_;
}
local ($i, $loc, $key, $val);
# Read in text
if ($ENV{'REQUEST_METHOD'} eq "GET") { # a GET -- data in encoded string
$in = $ENV{'QUERY_STRING'};
}
elsif ($ENV{'REQUEST_METHOD'} eq "POST") { # a POST -- data in variables
for ($i = 0; $i < $ENV{'CONTENT_LENGTH'}; $i++) {
$in .= getc;
}
}
elsif ($ENV{'REQUEST_METHOD'} eq "HEAD") {
$in = $ENV{'QUERY_STRING'};
}
#
# Read everything into a hashed array.
#
@in = split(/&/,$in);
# Decode arguments
foreach $i (0.. $#in) {
# Convert plus's to spaces
$in[$i] =~ s/\+/ /g;
# Convert %XX from hex numbers to alphanumeric
$in[$i] =~ s/%(..)/pack("c",hex($1))/ge;
}
if (defined ($val = $ENV{'PATH_INFO'}) && $val ne "") {
# Add PATH_INFO location to the end of the array, so it cannot
# be overwritten by QUERY_STRING
# type may be overwritten
# Also note the PATH_INFO should be already decoded, so
# we do not do this again!
push(@in, "path_info=$val");
}
# Untaint arguments and check for invalid characters
foreach $i (0 .. $#in) {
if ($in[$i] =~ m/^([-:a-zA-Z0-9+.=_\/ \[]*)$/) {
$in[$i] = $1; # untaint
}
else {
$in[$i] =~ s/&/&/g;
$in[$i] =~ s/</</g;
$in[$i] =~ s/>/>/g;
&error ($TRUE, "Invalid characters in input: $in[$i]" );
}
# Split into key and value.
$loc = index($in[$i],"=");
$key = substr($in[$i],0,$loc);
$val = substr($in[$i],$loc+1);
# \0 is the multiple separator
$in{$key} .= '\0' if (defined($in{$key}));
$in{$key} .= $val;
}
return 1; # just to keep things kosher.
}
###############################################################################
# PrintHeader() -- Use this before printing HTML data to the web-client.
###############################################################################
sub PrintHeader {
print "Content-type: text/html; charset=UTF-8\n\n";
}
###############################################################################
# error() -- call this to print error messages to the "screen" (web client)
###############################################################################
sub error {
local($print_header) = shift;;
local($error_msg) = @_;
&PrintHeader() unless $print_header eq $FALSE;
print "<html><head><title>Dwww error</title></head>\n";
print "<body><h1>Dwww error</h1>\n";
print "$error_msg\n";
print "</body></html>";
exit(1);
}
sub urlencode {
local ($ret) =$_[0];
$ret =~ s/([^A-Za-z0-9\_\-\.\/])/'%' . unpack("H*", $1)/eg;
$ret =~ tr/ /+/;
return $ret;
};
sub is_tainted {
return ! eval {
join('',@_), kill 0;
1;
};
}
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