deps: moving skiplock breaks qemu-server << 4.0-109
[pve-common.git] / 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;