1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent::MP::Transport - actual transport protocol |
3 | AnyEvent::MP::Transport - actual transport protocol handler |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use AnyEvent::MP::Transport; |
7 | use AnyEvent::MP::Transport; |
8 | |
8 | |
9 | =head1 DESCRIPTION |
9 | =head1 DESCRIPTION |
10 | |
10 | |
11 | This is the superclass for MP transports, most of which is considered an |
11 | This implements the actual transport protocol for MP (it represents a |
12 | implementation detail. |
12 | single link), most of which is considered an implementation detail. |
13 | |
13 | |
14 | See the "PROTOCOL" section below if you want to write another client for |
14 | See the "PROTOCOL" section below if you want to write another client for |
15 | this protocol. |
15 | this protocol. |
16 | |
16 | |
17 | =head1 FUNCTIONS/METHODS |
17 | =head1 FUNCTIONS/METHODS |
… | |
… | |
27 | use Scalar::Util; |
27 | use Scalar::Util; |
28 | use MIME::Base64 (); |
28 | use MIME::Base64 (); |
29 | use Storable (); |
29 | use Storable (); |
30 | use JSON::XS (); |
30 | use JSON::XS (); |
31 | |
31 | |
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32 | use Digest::MD6 (); |
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33 | use Digest::HMAC_MD6 (); |
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34 | |
32 | use AE (); |
35 | use AE (); |
33 | use AnyEvent::Socket (); |
36 | use AnyEvent::Socket (); |
34 | use AnyEvent::Handle (); |
37 | use AnyEvent::Handle (); |
35 | |
38 | |
36 | use base Exporter::; |
39 | use base Exporter::; |
… | |
… | |
43 | Creates a listener on the given host/port using |
46 | Creates a listener on the given host/port using |
44 | C<AnyEvent::Socket::tcp_server>. |
47 | C<AnyEvent::Socket::tcp_server>. |
45 | |
48 | |
46 | See C<new>, below, for constructor arguments. |
49 | See C<new>, below, for constructor arguments. |
47 | |
50 | |
48 | Defaults for peerhost, peerport, fh and tls are provided. |
51 | Defaults for peerhost, peerport and fh are provided. |
49 | |
52 | |
50 | =cut |
53 | =cut |
51 | |
54 | |
52 | sub mp_server($$@) { |
55 | sub mp_server($$@) { |
53 | my $cb = pop; |
56 | my $cb = pop; |
… | |
… | |
58 | |
61 | |
59 | $cb->(new AnyEvent::MP::Transport |
62 | $cb->(new AnyEvent::MP::Transport |
60 | fh => $fh, |
63 | fh => $fh, |
61 | peerhost => $host, |
64 | peerhost => $host, |
62 | peerport => $port, |
65 | peerport => $port, |
63 | tls => "accept", |
|
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64 | @args, |
66 | @args, |
65 | ); |
67 | ); |
66 | } |
68 | } |
67 | } |
69 | } |
68 | |
70 | |
… | |
… | |
82 | $cb->(new AnyEvent::MP::Transport |
84 | $cb->(new AnyEvent::MP::Transport |
83 | fh => $fh, |
85 | fh => $fh, |
84 | peername => $host, |
86 | peername => $host, |
85 | peerhost => $nhost, |
87 | peerhost => $nhost, |
86 | peerport => $nport, |
88 | peerport => $nport, |
87 | tls => "accept", |
|
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88 | @args, |
89 | @args, |
89 | ); |
90 | ); |
90 | } |
91 | } |
91 | } |
92 | } |
92 | |
93 | |
… | |
… | |
105 | on_eof => sub { clean-close-callback }, |
106 | on_eof => sub { clean-close-callback }, |
106 | on_connect => sub { successful-connect-callback }, |
107 | on_connect => sub { successful-connect-callback }, |
107 | greeting => { key => value }, |
108 | greeting => { key => value }, |
108 | |
109 | |
109 | # tls support |
110 | # tls support |
110 | tls => "accept|connect", |
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111 | tls_ctx => AnyEvent::TLS, |
111 | tls_ctx => AnyEvent::TLS, |
112 | peername => $peername, # for verification |
112 | peername => $peername, # for verification |
113 | ; |
113 | ; |
114 | |
114 | |
115 | =cut |
115 | =cut |
116 | |
116 | |
117 | our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference |
117 | our @FRAMINGS = qw(json storable); # the framing types we accept and send, in order of preference |
118 | our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send |
118 | our @AUTH_SND = qw(hmac_md6_64_256); # auth types we send |
119 | our @AUTH_RCV = (@AUTH_SND, qw(hex_secret)); # auth types we accept |
119 | our @AUTH_RCV = (@AUTH_SND, qw(cleartext)); # auth types we accept |
120 | |
120 | |
121 | #AnyEvent::Handle::register_write_type mp_record => sub { |
121 | #AnyEvent::Handle::register_write_type mp_record => sub { |
122 | #}; |
122 | #}; |
123 | |
123 | |
124 | sub new { |
124 | sub new { |
… | |
… | |
129 | $self->{queue} = []; |
129 | $self->{queue} = []; |
130 | |
130 | |
131 | { |
131 | { |
132 | Scalar::Util::weaken (my $self = $self); |
132 | Scalar::Util::weaken (my $self = $self); |
133 | |
133 | |
134 | if (exists $arg{connect}) { |
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135 | $arg{tls_ctx} ||= { sslv2 => 0, sslv3 => 0, tlsv1 => 1, verify => 1 }; |
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136 | } |
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137 | |
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138 | $arg{secret} = AnyEvent::MP::Base::default_secret () |
134 | $arg{secret} = AnyEvent::MP::Base::default_secret () |
139 | unless exists $arg{secret}; |
135 | unless exists $arg{secret}; |
140 | |
136 | |
|
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137 | $arg{timeout} = 3#d# |
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138 | unless exists $arg{timeout}; |
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139 | |
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140 | my $secret = $arg{secret}; |
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141 | |
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142 | if ($secret =~ /-----BEGIN RSA PRIVATE KEY-----.*-----END RSA PRIVATE KEY-----.*-----BEGIN CERTIFICATE-----.*-----END CERTIFICATE-----/s) { |
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143 | # assume TLS mode |
|
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144 | $arg{tls_ctx} = { |
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145 | sslv2 => 0, |
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146 | sslv3 => 0, |
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147 | tlsv1 => 1, |
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148 | verify => 1, |
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149 | cert => $secret, |
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150 | ca_cert => $secret, |
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151 | verify_require_client_cert => 1, |
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152 | }; |
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153 | } |
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154 | |
141 | $self->{hdl} = new AnyEvent::Handle |
155 | $self->{hdl} = new AnyEvent::Handle |
142 | fh => delete $arg{fh}, |
156 | fh => delete $arg{fh}, |
143 | rbuf_max => 64 * 1024, |
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|
144 | autocork => 1, |
157 | autocork => 1, |
145 | no_delay => 1, |
158 | no_delay => 1, |
146 | on_error => sub { |
159 | on_error => sub { |
147 | $self->error ($_[2]); |
160 | $self->error ($_[2]); |
148 | }, |
161 | }, |
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162 | timeout => $AnyEvent::MP::Base::CONNECT_TIMEOUT, |
149 | peername => delete $arg{peername}, |
163 | peername => delete $arg{peername}, |
150 | ; |
164 | ; |
151 | |
165 | |
152 | my $secret = $arg{secret}; |
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153 | my $greeting_kv = $self->{greeting} ||= {}; |
166 | my $greeting_kv = $self->{greeting} ||= {}; |
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167 | |
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168 | $self->{local_node} = $AnyEvent::MP::Base::NODE; |
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169 | |
154 | $greeting_kv->{"tls"} = "1.0" |
170 | $greeting_kv->{"tls"} = "1.0" if $arg{tls_ctx}; |
155 | if $arg{tls_ctx}; |
|
|
156 | $greeting_kv->{provider} = "AE-$VERSION"; |
171 | $greeting_kv->{provider} = "AE-$VERSION"; |
157 | $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport}; |
172 | $greeting_kv->{peeraddr} = AnyEvent::Socket::format_hostport $self->{peerhost}, $self->{peerport}; |
|
|
173 | $greeting_kv->{timeout} = $arg{timeout}; |
158 | |
174 | |
159 | # send greeting |
175 | # send greeting |
160 | my $lgreeting1 = "aemp;$PROTOCOL_VERSION;$PROTOCOL_VERSION" # version, min |
176 | my $lgreeting1 = "aemp;$PROTOCOL_VERSION" |
161 | . ";$AnyEvent::MP::Base::UNIQ" |
177 | . ";$self->{local_node}" |
162 | . ";$AnyEvent::MP::Base::NODE" |
|
|
163 | . ";" . (join ",", @AUTH_RCV) |
178 | . ";" . (join ",", @AUTH_RCV) |
164 | . ";" . (join ",", @FRAMINGS) |
179 | . ";" . (join ",", @FRAMINGS) |
165 | . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); |
180 | . (join "", map ";$_=$greeting_kv->{$_}", keys %$greeting_kv); |
|
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181 | |
166 | my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; |
182 | my $lgreeting2 = MIME::Base64::encode_base64 AnyEvent::MP::Base::nonce (33), ""; |
167 | |
183 | |
168 | $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012"); |
184 | $self->{hdl}->push_write ("$lgreeting1\012$lgreeting2\012"); |
169 | |
185 | |
170 | # expect greeting |
186 | # expect greeting |
|
|
187 | $self->{hdl}->rbuf_max (4 * 1024); |
171 | $self->{hdl}->push_read (line => sub { |
188 | $self->{hdl}->push_read (line => sub { |
172 | my $rgreeting1 = $_[1]; |
189 | my $rgreeting1 = $_[1]; |
173 | |
190 | |
174 | my ($aemp, $version, $version_min, $uniq, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1; |
191 | my ($aemp, $version, $rnode, $auths, $framings, @kv) = split /;/, $rgreeting1; |
175 | |
192 | |
176 | if ($aemp ne "aemp") { |
193 | if ($aemp ne "aemp") { |
177 | return $self->error ("unparsable greeting"); |
194 | return $self->error ("unparsable greeting"); |
178 | } elsif ($version_min > $PROTOCOL_VERSION) { |
195 | } elsif ($version != $PROTOCOL_VERSION) { |
179 | return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version_min .. $version)"); |
196 | return $self->error ("version mismatch (we: $PROTOCOL_VERSION, they: $version)"); |
180 | } |
197 | } |
181 | |
198 | |
182 | my $s_auth; |
199 | my $s_auth; |
183 | for my $auth_ (split /,/, $auths) { |
200 | for my $auth_ (split /,/, $auths) { |
184 | if (grep $auth_ eq $_, @AUTH_SND) { |
201 | if (grep $auth_ eq $_, @AUTH_SND) { |
… | |
… | |
201 | } |
218 | } |
202 | |
219 | |
203 | defined $s_framing |
220 | defined $s_framing |
204 | or return $self->error ("$framings: no common framing method supported"); |
221 | or return $self->error ("$framings: no common framing method supported"); |
205 | |
222 | |
206 | $self->{remote_uniq} = $uniq; |
|
|
207 | $self->{remote_node} = $rnode; |
223 | $self->{remote_node} = $rnode; |
208 | |
224 | |
209 | $self->{remote_greeting} = { |
225 | $self->{remote_greeting} = { |
210 | map /^([^=]+)(?:=(.*))?/ ? ($1 => $2) : (), |
226 | map /^([^=]+)(?:=(.*))?/ ? ($1 => $2) : (), |
211 | @kv |
227 | @kv |
… | |
… | |
213 | |
229 | |
214 | # read nonce |
230 | # read nonce |
215 | $self->{hdl}->push_read (line => sub { |
231 | $self->{hdl}->push_read (line => sub { |
216 | my $rgreeting2 = $_[1]; |
232 | my $rgreeting2 = $_[1]; |
217 | |
233 | |
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234 | "$lgreeting1\012$lgreeting2" ne "$rgreeting1\012$rgreeting2" # echo attack? |
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235 | or return $self->error ("authentication error, echo attack?"); |
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236 | |
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237 | my $key = Digest::MD6::md6 $secret; |
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238 | my $lauth; |
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239 | |
218 | if ($self->{tls_ctx} and 1 == int $self->{remote_greeting}{"tls"}) { |
240 | if ($self->{tls_ctx} and 1 == int $self->{remote_greeting}{tls}) { |
219 | $self->{tls} = $lgreeting2 lt $rgreeting2 ? "connect" : "accept"; |
241 | $self->{tls} = $lgreeting2 lt $rgreeting2 ? "connect" : "accept"; |
220 | $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx}); |
242 | $self->{hdl}->starttls ($self->{tls}, $self->{tls_ctx}); |
|
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243 | $s_auth = "tls"; |
|
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244 | $lauth = ""; |
|
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245 | } else { |
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246 | # we currently only support hmac_md6_64_256 |
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247 | $lauth = Digest::HMAC_MD6::hmac_md6_hex $key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256; |
221 | } |
248 | } |
222 | |
|
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223 | # auth |
|
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224 | require Digest::MD6; |
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225 | require Digest::HMAC_MD6; |
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226 | |
|
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227 | my $key = Digest::MD6::md6_hex ($secret); |
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228 | my $lauth = Digest::HMAC_MD6::hmac_md6_base64 ($key, "$lgreeting1\012$lgreeting2\012$rgreeting1\012$rgreeting2\012", 64, 256); |
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229 | |
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230 | my $rauth = |
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231 | $s_auth eq "hmac_md6_64_256" ? Digest::HMAC_MD6::hmac_md6_base64 ($key, "$rgreeting1\012$rgreeting2\012$lgreeting1\012$lgreeting2\012", 64, 256) |
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232 | : $s_auth eq "hex_secret" ? unpack "H*", $secret |
|
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233 | : die; |
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234 | |
|
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235 | $lauth ne $rauth # echo attack? |
|
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236 | or return $self->error ("authentication error"); |
|
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237 | |
249 | |
238 | $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012"); |
250 | $self->{hdl}->push_write ("$s_auth;$lauth;$s_framing\012"); |
239 | |
251 | |
240 | $self->{hdl}->rbuf_max (64); # enough for 44 reply bytes or so |
252 | # read the authentication response |
241 | $self->{hdl}->push_read (line => sub { |
253 | $self->{hdl}->push_read (line => sub { |
242 | my ($hdl, $rline) = @_; |
254 | my ($hdl, $rline) = @_; |
243 | |
255 | |
244 | my ($auth_method, $rauth2, $r_framing) = split /;/, $rline; |
256 | my ($auth_method, $rauth2, $r_framing) = split /;/, $rline; |
|
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257 | |
|
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258 | my $rauth = |
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259 | $auth_method eq "hmac_md6_64_256" ? Digest::HMAC_MD6::hmac_md6_hex $key, "$rgreeting1\012$rgreeting2\012$lgreeting1\012$lgreeting2\012", 64, 256 |
|
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260 | : $auth_method eq "cleartext" ? unpack "H*", $secret |
|
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261 | : $auth_method eq "tls" ? ($self->{tls} ? "" : "\012\012") # \012\012 never matches |
|
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262 | : return $self->error ("$auth_method: fatal, selected unsupported auth method"); |
245 | |
263 | |
246 | if ($rauth2 ne $rauth) { |
264 | if ($rauth2 ne $rauth) { |
247 | return $self->error ("authentication failure/shared secret mismatch"); |
265 | return $self->error ("authentication failure/shared secret mismatch"); |
248 | } |
266 | } |
249 | |
267 | |
250 | $self->{s_framing} = $s_framing; |
268 | $self->{s_framing} = $s_framing; |
251 | |
269 | |
252 | $hdl->rbuf_max (undef); |
270 | $hdl->rbuf_max (undef); |
253 | my $queue = delete $self->{queue}; # we are connected |
271 | my $queue = delete $self->{queue}; # we are connected |
254 | |
272 | |
|
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273 | $self->{hdl}->timeout ($self->{remote_greeting}{timeout}); |
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274 | |
255 | $self->connected; |
275 | $self->connected; |
256 | |
276 | |
257 | $hdl->push_write ($self->{s_framing} => $_) |
277 | my $src_node = $self->{node}; |
|
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278 | |
|
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279 | $self->send ($_) |
258 | for @$queue; |
280 | for @$queue; |
259 | |
281 | |
260 | my $rmsg; $rmsg = sub { |
282 | my $rmsg; $rmsg = sub { |
261 | $_[0]->push_read ($r_framing => $rmsg); |
283 | $_[0]->push_read ($r_framing => $rmsg); |
262 | |
284 | |
|
|
285 | local $AnyEvent::MP::Base::SRCNODE = $src_node; |
263 | AnyEvent::MP::Base::_inject ($_[1]); |
286 | AnyEvent::MP::Base::_inject (@{ $_[1] }); |
264 | }; |
287 | }; |
265 | $hdl->push_read ($r_framing => $rmsg); |
288 | $hdl->push_read ($r_framing => $rmsg); |
266 | }); |
289 | }); |
267 | }); |
290 | }); |
268 | }); |
291 | }); |
… | |
… | |
273 | |
296 | |
274 | sub error { |
297 | sub error { |
275 | my ($self, $msg) = @_; |
298 | my ($self, $msg) = @_; |
276 | |
299 | |
277 | if ($self->{node} && $self->{node}{transport} == $self) { |
300 | if ($self->{node} && $self->{node}{transport} == $self) { |
|
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301 | #TODO: store error, but do not instantly fail |
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302 | $self->{node}->fail (transport_error => $self->{node}{noderef}, $msg); |
278 | $self->{node}->clr_transport; |
303 | $self->{node}->clr_transport; |
279 | } |
304 | } |
280 | $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg"); |
305 | $AnyEvent::MP::Base::WARN->("$self->{peerhost}:$self->{peerport}: $msg"); |
281 | $self->destroy; |
306 | $self->destroy; |
282 | } |
307 | } |
283 | |
308 | |
284 | sub connected { |
309 | sub connected { |
285 | my ($self) = @_; |
310 | my ($self) = @_; |
286 | |
311 | |
|
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312 | if (ref $AnyEvent::MP::Base::SLAVE) { |
|
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313 | # first connect with a master node |
|
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314 | my $via = $self->{remote_node}; |
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315 | $via =~ s/,/!/g; |
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316 | $AnyEvent::MP::Base::NODE .= "\@$via"; |
|
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317 | $AnyEvent::MP::Base::NODE{$AnyEvent::MP::Base::NODE} = $AnyEvent::MP::Base::NODE{""}; |
|
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318 | $AnyEvent::MP::Base::SLAVE->(); |
|
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319 | } |
|
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320 | |
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321 | if ($self->{local_node} ne $AnyEvent::MP::Base::NODE) { |
|
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322 | # node changed its name since first greeting |
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323 | $self->send (["", iam => $AnyEvent::MP::Base::NODE]); |
|
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324 | } |
|
|
325 | |
287 | my $node = AnyEvent::MP::Base::add_node ($self->{remote_node}); |
326 | my $node = AnyEvent::MP::Base::add_node ($self->{remote_node}); |
288 | Scalar::Util::weaken ($self->{node} = $node); |
327 | Scalar::Util::weaken ($self->{node} = $node); |
289 | $node->set_transport ($self); |
328 | $node->set_transport ($self); |
290 | } |
329 | } |
291 | |
330 | |
… | |
… | |
319 | The greeting consists of two text lines that are ended by either an ASCII |
358 | The greeting consists of two text lines that are ended by either an ASCII |
320 | CR LF pair, or a single ASCII LF (recommended). |
359 | CR LF pair, or a single ASCII LF (recommended). |
321 | |
360 | |
322 | =head2 GREETING |
361 | =head2 GREETING |
323 | |
362 | |
|
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363 | All the lines until after authentication must not exceed 4kb in length, |
|
|
364 | including delimiter. Afterwards there is no limit on the packet size that |
|
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365 | can be received. |
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366 | |
|
|
367 | =head3 First Greeting Line |
|
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368 | |
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369 | Example: |
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370 | |
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371 | aemp;0;fec.4a7720fc;127.0.0.1:1235,[::1]:1235;hmac_md6_64_256;json,storable;provider=AE-0.0 |
|
|
372 | |
324 | The first line contains strings separated (not ended) by C<;> |
373 | The first line contains strings separated (not ended) by C<;> |
325 | characters. The first seven strings are fixed by the protocol, the |
374 | characters. The first even ixtrings are fixed by the protocol, the |
326 | remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;> |
375 | remaining strings are C<KEY=VALUE> pairs. None of them may contain C<;> |
327 | characters themselves. |
376 | characters themselves. |
328 | |
377 | |
329 | The seven fixed strings are: |
378 | The fixed strings are: |
330 | |
379 | |
331 | =over 4 |
380 | =over 4 |
332 | |
381 | |
333 | =item C<aemp> |
382 | =item protocol identification |
334 | |
383 | |
335 | The constant C<aemp> to identify the protocol. |
384 | The constant C<aemp> to identify the protocol. |
336 | |
385 | |
337 | =item protocol version |
386 | =item protocol version |
338 | |
387 | |
339 | The (maximum) protocol version supported by this end, currently C<0>. |
|
|
340 | |
|
|
341 | =item minimum protocol version |
|
|
342 | |
|
|
343 | The minimum protocol version supported by this end, currently C<0>. |
388 | The protocol version supported by this end, currently C<0>. If the |
344 | |
389 | versions don't match then no communication is possible. Minor extensions |
345 | =item a token uniquely identifying the current node instance |
390 | are supposed to be handled through additional key-value pairs. |
346 | |
|
|
347 | This is a string that must change between restarts. It usually contains |
|
|
348 | things like the current time, the (OS) process id or similar values, but |
|
|
349 | no meaning of the contents are assumed. |
|
|
350 | |
391 | |
351 | =item the node endpoint descriptors |
392 | =item the node endpoint descriptors |
352 | |
393 | |
353 | for public nodes, this is a comma-separated list of protocol endpoints, |
394 | for public nodes, this is a comma-separated list of protocol endpoints, |
354 | i.e., the noderef. For slave nodes, this is a unique identifier. |
395 | i.e., the noderef. For slave nodes, this is a unique identifier of the |
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396 | form C<slave/nonce>. |
355 | |
397 | |
356 | =item the acceptable authentication methods |
398 | =item the acceptable authentication methods |
357 | |
399 | |
358 | A comma-separated list of authentication methods supported by the |
400 | A comma-separated list of authentication methods supported by the |
359 | node. Note that AnyEvent::MP supports a C<hex_secret> authentication |
401 | node. Note that AnyEvent::MP supports a C<hex_secret> authentication |
… | |
… | |
366 | |
408 | |
367 | A comma-separated list of packet encoding/framign formats understood. The |
409 | A comma-separated list of packet encoding/framign formats understood. The |
368 | receiving side should choose the first framing format it supports for |
410 | receiving side should choose the first framing format it supports for |
369 | sending packets (which might be different from the format it has to accept). |
411 | sending packets (which might be different from the format it has to accept). |
370 | |
412 | |
371 | =cut |
413 | =back |
372 | |
414 | |
373 | The remaining arguments are C<KEY=VALUE> pairs. The following key-value |
415 | The remaining arguments are C<KEY=VALUE> pairs. The following key-value |
374 | pairs are known at this time: |
416 | pairs are known at this time: |
375 | |
417 | |
376 | =over 4 |
418 | =over 4 |
… | |
… | |
388 | =item tls=<major>.<minor> |
430 | =item tls=<major>.<minor> |
389 | |
431 | |
390 | Indicates that the other side supports TLS (version should be 1.0) and |
432 | Indicates that the other side supports TLS (version should be 1.0) and |
391 | wishes to do a TLS handshake. |
433 | wishes to do a TLS handshake. |
392 | |
434 | |
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435 | =item timeout=<seconds> |
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436 | |
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437 | The amount of time after which this node should be detected as dead unless |
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438 | some data has been received. The node is responsible to send traffic |
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439 | reasonably more often than this interval (such as every timeout minus five |
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440 | seconds). |
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441 | |
393 | =back |
442 | =back |
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443 | |
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444 | =head3 Second Greeting Line |
394 | |
445 | |
395 | After this greeting line there will be a second line containing a |
446 | After this greeting line there will be a second line containing a |
396 | cryptographic nonce, i.e. random data of high quality. To keep the |
447 | cryptographic nonce, i.e. random data of high quality. To keep the |
397 | protocol text-only, these are usually 32 base64-encoded octets, but |
448 | protocol text-only, these are usually 32 base64-encoded octets, but |
398 | it could be anything that doesn't contain any ASCII CR or ASCII LF |
449 | it could be anything that doesn't contain any ASCII CR or ASCII LF |
399 | characters. |
450 | characters. |
400 | |
451 | |
401 | Example of the two lines of greeting: |
452 | I<< The two nonces B<must> be different, and an aemp implementation |
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453 | B<must> check and fail when they are identical >>. |
402 | |
454 | |
403 | aemp;0;0;e7d.4a76f48f;10.0.0.1:4040;hmac_md6_64_256,hex_secret;json,storable;provider=AE-0.0;peeraddr=127.0.0.1:1235 |
455 | Example of a nonce line: |
404 | XntegV2Guvss0qNn7phCPnoU87xqxV+4Mqm/5y4iQm6a |
456 | |
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457 | p/I122ql7kJR8lumW3lXlXCeBnyDAvz8NQo3x5IFowE4 |
405 | |
458 | |
406 | =head2 TLS handshake |
459 | =head2 TLS handshake |
407 | |
460 | |
408 | If, after the handshake, both sides indicate interest in TLS, then the |
461 | I<< If, after the handshake, both sides indicate interest in TLS, then the |
409 | connection I<must> use TLS, or fail. |
462 | connection B<must> use TLS, or fail. >> |
410 | |
463 | |
411 | Both sides compare their nonces, and the side who sent the lower nonce |
464 | Both sides compare their nonces, and the side who sent the lower nonce |
412 | value ("string" comparison on the raw octet values) becomes the client, |
465 | value ("string" comparison on the raw octet values) becomes the client, |
413 | and the one with the higher nonce the server. |
466 | and the one with the higher nonce the server. |
414 | |
467 | |
… | |
… | |
425 | |
478 | |
426 | =item the authentication method chosen |
479 | =item the authentication method chosen |
427 | |
480 | |
428 | This must be one of the methods offered by the other side in the greeting. |
481 | This must be one of the methods offered by the other side in the greeting. |
429 | |
482 | |
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483 | The currently supported authentication methods are: |
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484 | |
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485 | =over 4 |
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486 | |
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487 | =item cleartext |
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488 | |
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489 | This is simply the shared secret, lowercase-hex-encoded. This method is of |
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490 | course very insecure, unless TLS is used, which is why this module will |
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491 | accept, but not generate, cleartext auth replies. |
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492 | |
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493 | =item hmac_md6_64_256 |
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494 | |
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495 | This method uses an MD6 HMAC with 64 bit blocksize and 256 bit hash. First, the shared secret |
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|
496 | is hashed with MD6: |
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497 | |
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498 | key = MD6 (secret) |
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499 | |
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500 | This secret is then used to generate the "local auth reply", by taking |
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501 | the two local greeting lines and the two remote greeting lines (without |
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502 | line endings), appending \012 to all of them, concatenating them and |
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503 | calculating the MD6 HMAC with the key. |
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504 | |
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505 | lauth = HMAC_MD6 key, "lgreeting1\012lgreeting2\012rgreeting1\012rgreeting2\012" |
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506 | |
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507 | This authentication token is then lowercase-hex-encoded and sent to the |
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508 | other side. |
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509 | |
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510 | Then the remote auth reply is generated using the same method, but local |
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511 | and remote greeting lines swapped: |
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512 | |
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513 | rauth = HMAC_MD6 key, "rgreeting1\012rgreeting2\012lgreeting1\012lgreeting2\012" |
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514 | |
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515 | This is the token that is expected from the other side. |
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516 | |
|
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517 | =item tls |
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518 | |
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519 | This type is only valid iff TLS was enabled and the TLS handshake |
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520 | was successful. It has no authentication data, as the server/client |
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521 | certificate was successfully verified. |
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522 | |
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523 | Implementations supporting TLS I<must> accept this authentication type. |
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524 | |
|
|
525 | =back |
|
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526 | |
430 | =item the authentication data |
527 | =item the authentication data |
431 | |
528 | |
432 | The authentication data itself, usually base64 or hex-encoded data. |
529 | The authentication data itself, usually base64 or hex-encoded data, see |
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530 | above. |
433 | |
531 | |
434 | =item the framing protocol chosen |
532 | =item the framing protocol chosen |
435 | |
533 | |
436 | This must be one of the framing protocols offered by the other side in the |
534 | This must be one of the framing protocols offered by the other side in the |
437 | greeting. Each side must accept the choice of the other side. |
535 | greeting. Each side must accept the choice of the other side. |
438 | |
536 | |
439 | =back |
537 | =back |
440 | |
538 | |
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539 | Example of an authentication reply: |
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540 | |
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541 | hmac_md6_64_256;363d5175df38bd9eaddd3f6ca18aa1c0c4aa22f0da245ac638d048398c26b8d3;json |
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542 | |
441 | =head2 DATA PHASE |
543 | =head2 DATA PHASE |
442 | |
544 | |
443 | After this, packets get exchanged using the chosen framing protocol. It is |
545 | After this, packets get exchanged using the chosen framing protocol. It is |
444 | quite possible that both sides use a different framing protocol. |
546 | quite possible that both sides use a different framing protocol. |
445 | |
547 | |
|
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548 | =head2 FULL EXAMPLE |
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549 | |
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|
550 | This is an actual protocol dump of a handshake, followed by a single data |
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551 | packet. The greater than/less than lines indicate the direction of the |
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552 | transfer only. |
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|
553 | |
|
|
554 | > aemp;0;nndKd+gn;10.0.0.1:4040;hmac_md6_64_256,cleartext;json,storable;provider=AE-0.0;peeraddr=127.0.0.1:1235 |
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555 | > sRG8bbc4TDbkpvH8FTP4HBs87OhepH6VuApoZqXXskuG |
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556 | < aemp;0;nmpKd+gh;127.0.0.1:1235,[::1]:1235;hmac_md6_64_256,cleartext;json,storable;provider=AE-0.0;peeraddr=127.0.0.1:58760 |
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557 | < dCEUcL/LJVSTJcx8byEsOzrwhzJYOq+L3YcopA5T6EAo |
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558 | > hmac_md6_64_256;9513d4b258975accfcb2ab7532b83690e9c119a502c612203332a591c7237788;json |
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559 | < hmac_md6_64_256;0298d6ba2240faabb2b2e881cf86b97d70a113ca74a87dc006f9f1e9d3010f90;json |
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|
560 | > ["","lookup","pinger","10.0.0.1:4040#nndKd+gn.a","resolved"] |
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561 | |
446 | =head1 SEE ALSO |
562 | =head1 SEE ALSO |
447 | |
563 | |
448 | L<AnyEvent>. |
564 | L<AnyEvent>. |
449 | |
565 | |
450 | =head1 AUTHOR |
566 | =head1 AUTHOR |