cgi/usercert.cgi

   1 #!/usr/bin/perl
   2
   3 # usercert.cgi -- user push authentication certificate retrieval
   4 # Copyright (c) 2013 Kyle J. McKay.  All rights reserved.
   5
   6 # This program is free software; you can redistribute it and/or
   7 # modify it under the terms of the GNU General Public License
   8 # as published by the Free Software Foundation; either version 2
   9 # of the License, or (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19
  20 # Version 1.2
  21
  22 use strict;
  23 use warnings;
  24
  25 use lib ".";
  26 use Girocco::CGI;
  27 use Girocco::Config;
  28 use Girocco::User;
  29 use Girocco::Util;
  30 use Girocco::SSHUtil;
  31
  32 sub notfound
  33 {
  34         my $mesg = shift || "<p>404 - Not found</p>";
  35         my $gcgi = Girocco::CGI->new('User HTTPS Push Authentication Certificate');
  36         print $mesg;
  37         exit;
  38 }
  39
  40 sub mtime
  41 {
  42         my $fname = shift;
  43         my (undef,undef,undef,undef,undef,undef,undef,undef,undef,$mtime) = stat $fname;
  44         return $mtime;
  45 }
  46
  47 sub readfile
  48 {
  49         my $fname = shift;
  50         local $/;
  51         open(FILE, '<', $fname) or return undef;
  52         my $contents = <FILE>;
  53         close(FILE);
  54         return $contents;
  55 }
  56
  57 notfound unless $Girocco::Config::clientcert && $Girocco::Config::clientkey;
  58 notfound unless -f $Girocco::Config::clientcert && -f $Girocco::Config::clientkey;
  59 notfound unless -r $Girocco::Config::clientcert && -r $Girocco::Config::clientkey;
  60
  61 my $cgi = CGI->new;
  62
  63 notfound if $cgi->request_method() ne 'GET' && $cgi->request_method() ne 'HEAD';
  64 notfound "<p>Go away, bot.</p>" if $cgi->param('mail');
  65
  66 my $nick = $Girocco::Config::nickname;
  67
  68 my $name = $cgi->param('name');
  69 $name =~ s/^\s*(.*?)\s*$/$1/ if $name;
  70 my $line = $cgi->param('line');
  71 $line =~ s/^\s*(.*?)\s*$/$1/ if $line;
  72 my $view = $cgi->param('view');
  73 $view =~ s/^\s*(.*?)\s*$/$1/ if $view;
  74
  75 notfound if $cgi->path_info() && ($name || $line);
  76
  77 if ($cgi->path_info() =~ m,/([^/]+)/([^/]+)/([^/]+)$,) {
  78         my ($tn,$tl,$tp) = ($1,$2,$3);
  79         if ("${nick}_${tn}_user_$tl.pem" eq $tp) {
  80                 $name = $tn;
  81                 $line = $tl;
  82         }
  83 }
  84
  85 notfound unless $name && $line && $line =~ /^[1-9][0-9]*$/;
  86 $line += 0;
  87
  88 notfound unless Girocco::User::valid_name($name) && Girocco::User::does_exist($name);
  89 my $user = Girocco::User->load($name) or notfound;
  90
  91 my @keys = split(/\r?\n/, $user->{keys});
  92 $line <= @keys or notfound;
  93 my ($type, $bits, $fingerprint, $comment) = sshpub_validate($keys[$line-1]);
  94 $type && $type eq 'ssh-rsa' or notfound;
  95
  96 my $sshkeys = jailed_file($user->_sshkey_path);
  97 my $kname = "${nick}_${name}_user_$line.pem";
  98 my $sshcert = jailed_file("/etc/sshcerts/$kname");
  99 my $sshkeysmtime = mtime($sshkeys);
 100 notfound unless $sshkeysmtime;
 101 my $sshcertmtime = mtime($sshcert);
 102 if (!$sshcertmtime || $sshkeysmtime >= $sshcertmtime) {
 103         unlink $sshcert;
 104         my @args = (
 105                 "$Girocco::Config::basedir/bin/CACreateCert", "--quiet", "--client",
 106                 "--cert", $Girocco::Config::clientcert,
 107                 "--key", $Girocco::Config::clientkey,
 108                 "--out", $sshcert
 109                 );
 110         push(@args, "--suffix", $Girocco::Config::clientcertsuffix)
 111                 if $Girocco::Config::clientcertsuffix;
 112         push(@args, "--dnq", $user->{uuid}, $name);
 113         open(PIPE, "|-", @args) or notfound;
 114         print PIPE $keys[$line-1], "\n";
 115         close(PIPE) or notfound;
 116         chmod(0664, $sshcert);
 117 }
 118 notfound unless -r $sshcert;
 119 my $certdata = readfile($sshcert);
 120 notfound unless $certdata;
 121 my $isviewonly = 0;
 122 $isviewonly = 0 + $view if $view && $view =~ /^[01]$/;
 123 if ($isviewonly) {
 124         print "Content-Type: text/plain\r\n"
 125 } else {
 126         print "Content-Type: application/octet-stream\r\n";
 127         print "Content-Disposition: attachment; filename=\"$kname\"\r\n";
 128 }
 129 print "\r\n";
 130 print $certdata unless $cgi->request_method() eq 'HEAD';
 131
 132 exit 0;