src/PVE/Ticket.pm

   1 package PVE::Ticket;
   2
   3 use strict;
   4 use warnings;
   5
   6 use Crypt::OpenSSL::Random;
   7 use Crypt::OpenSSL::RSA;
   8 use MIME::Base64;
   9 use Digest::SHA;
  10 use Time::HiRes qw(gettimeofday);
  11
  12 use PVE::Exception qw(raise);
  13
  14 Crypt::OpenSSL::RSA->import_random_seed();
  15
  16 use constant HTTP_UNAUTHORIZED => 401;
  17
  18 sub assemble_csrf_prevention_token {
  19     my ($secret, $username) = @_;
  20
  21     my $timestamp = sprintf("%08X", time());
  22
  23     my $digest = Digest::SHA::sha1_base64("$timestamp:$username", $secret);
  24
  25     return "$timestamp:$digest";
  26 }
  27
  28 sub verify_csrf_prevention_token {
  29     my ($secret, $username, $token, $min_age, $max_age, $noerr) = @_;
  30
  31     if ($token =~ m/^([A-Z0-9]{8}):(\S+)$/) {
  32         my $sig = $2;
  33         my $timestamp = $1;
  34         my $ttime = hex($timestamp);
  35
  36         my $digest = Digest::SHA::sha1_base64("$timestamp:$username", $secret);
  37
  38         my $age = time() - $ttime;
  39         return 1 if ($digest eq $sig) && ($age > $min_age) &&
  40             ($age < $max_age);
  41     }
  42
  43     raise("Permission denied - invalid csrf token\n", code => HTTP_UNAUTHORIZED)
  44         if !$noerr;
  45
  46     return undef;
  47 }
  48
  49 # Note: data may not contain white spaces (verify fails in that case)
  50 sub assemble_rsa_ticket {
  51     my ($rsa_priv, $prefix, $data, $secret_data) = @_;
  52
  53     my $timestamp = sprintf("%08X", time());
  54
  55     my $plain = "$prefix:";
  56
  57     $plain .= "$data:" if defined($data);
  58
  59     $plain .= $timestamp;
  60
  61     my $full = defined($secret_data) ? "$plain:$secret_data" : $plain;
  62
  63     my $ticket = $plain . "::" . encode_base64($rsa_priv->sign($full), '');
  64
  65     return $ticket;
  66 }
  67
  68 sub verify_rsa_ticket {
  69     my ($rsa_pub, $prefix, $ticket, $secret_data, $min_age, $max_age, $noerr) = @_;
  70
  71     if ($ticket && $ticket =~ m/^(\Q$prefix\E:\S+)::([^:\s]+)$/) {
  72         my $plain = $1;
  73         my $sig = $2;
  74
  75         my $full = defined($secret_data) ? "$plain:$secret_data" : $plain;
  76
  77         if ($rsa_pub->verify($full, decode_base64($sig))) {
  78             if ($plain =~ m/^\Q$prefix\E:(?:(\S+):)?([A-Z0-9]{8})$/) {
  79                 my $data = $1; # Note: not all tickets contains data
  80                 my $timestamp = $2;
  81                 my $ttime = hex($timestamp);
  82
  83                 my $age = time() - $ttime;
  84
  85                 if (($age > $min_age) && ($age < $max_age)) {
  86                     if (defined($data)) {
  87                         return wantarray ? ($data, $age) : $data;
  88                     } else {
  89                         return wantarray ? (1, $age) : 1;
  90                     }
  91                 }
  92             }
  93         }
  94     }
  95
  96     raise("permission denied - invalid $prefix ticket\n", code => HTTP_UNAUTHORIZED)
  97         if !$noerr;
  98
  99     return undef;
 100 }
 101
 102 sub assemble_spice_ticket {
 103     my ($secret, $username, $vmid, $node) = @_;
 104
 105     my ($seconds, $microseconds) = gettimeofday;
 106
 107     my $timestamp = sprintf("%08x", $seconds);
 108
 109     my $randomstr = "PVESPICE:$timestamp:$username:$vmid:$node:$secret:" .
 110         ':' . sprintf("%08x", $microseconds) .
 111         ':' . sprintf("%08x", $$) .
 112         ':' . rand(1);
 113
 114     # this should be used as one-time password
 115     # max length is 60 chars (spice limit)
 116     # we pass this to qemu set_pasword and limit lifetime there
 117     # keep this secret
 118     my $ticket = Digest::SHA::sha1_hex($randomstr);
 119
 120     # Note: spice proxy connects with HTTP, so $proxyticket is exposed to public
 121     # we use a signature/timestamp to make sure nobody can fake such a ticket
 122     # an attacker can use this $proxyticket, but he will fail because $ticket is
 123     # private.
 124     # The proxy needs to be able to extract/verify the ticket
 125     # Note: data needs to be lower case only, because virt-viewer needs that
 126     # Note: RSA signature are too long (>=256 charaters) and make problems with remote-viewer
 127
 128     my $plain = "pvespiceproxy:$timestamp:$vmid:" . lc($node);
 129
 130     # produces 40 characters
 131     my $sig = unpack("H*", Digest::SHA::sha1($plain, $secret));
 132
 133     #my $sig =  unpack("H*", $rsa_priv->sign($plain)); # this produce too long strings (512)
 134
 135     my $proxyticket = "$plain::$sig";
 136
 137     return ($ticket, $proxyticket);
 138 }
 139
 140 sub verify_spice_connect_url {
 141     my ($secret, $connect_str) = @_;
 142
 143     # Note: we pass the spice ticket as 'host', so the
 144     # spice viewer connects with "$ticket:$port"
 145
 146     return undef if !$connect_str;
 147
 148     if ($connect_str =~m/^pvespiceproxy:([a-z0-9]{8}):(\d+):(\S+)::([a-z0-9]{40}):(\d+)$/) {
 149         my ($timestamp, $vmid, $node, $hexsig, $port) = ($1, $2, $3, $4, $5, $6);
 150         my $ttime = hex($timestamp);
 151         my $age = time() - $ttime;
 152
 153         # use very limited lifetime - is this enough?
 154         return undef if !(($age > -20) && ($age < 40));
 155
 156         my $plain = "pvespiceproxy:$timestamp:$vmid:$node";
 157         my $sig = unpack("H*", Digest::SHA::sha1($plain, $secret));
 158
 159         if ($sig eq $hexsig) {
 160             return ($vmid, $node, $port);
 161         }
 162     }
 163
 164     return undef;
 165 }
 166
 167 1;