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