1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
<?php
require_once('include/crypto.php');
function get_salmon_key($uri,$keyhash) {
$ret = array();
logger('Fetching salmon key for ' . $uri, LOGGER_DEBUG, LOG_INFO);
$x = webfinger_rfc7033($uri,true);
logger('webfinger returns: ' . print_r($x,true), LOGGER_DATA, LOG_DEBUG);
if($x && array_key_exists('links',$x) && $x['links']) {
foreach($x['links'] as $link) {
if(array_key_exists('rel',$link) && $link['rel'] === 'magic-public-key') {
$ret[] = $link['href'];
}
}
}
else {
$arr = old_webfinger($uri);
logger('old webfinger returns: ' . print_r($arr,true), LOGGER_DATA, LOG_DEBUG);
if(is_array($arr)) {
foreach($arr as $a) {
if($a['@attributes']['rel'] === 'magic-public-key') {
$ret[] = $a['@attributes']['href'];
}
}
}
else {
return '';
}
}
// We have found at least one key URL
// If it's inline, parse it - otherwise get the key
if(count($ret)) {
for($x = 0; $x < count($ret); $x ++) {
if(substr($ret[$x],0,5) === 'data:') {
if(strstr($ret[$x],','))
$ret[$x] = substr($ret[$x],strpos($ret[$x],',')+1);
else
$ret[$x] = substr($ret[$x],5);
}
else
$ret[$x] = fetch_url($ret[$x]);
}
}
logger('Key located: ' . print_r($ret,true), LOGGER_DEBUG, LOG_INFO);
if(count($ret) == 1) {
// We only found one one key so we don't care if the hash matches.
// If it's the wrong key we'll find out soon enough because
// message verification will fail. This also covers some older
// software which don't supply a keyhash. As long as they only
// have one key we'll be right.
return $ret[0];
}
else {
foreach($ret as $a) {
$hash = base64url_encode(hash('sha256',$a));
if($hash == $keyhash)
return $a;
}
}
return '';
}
function slapper($owner,$url,$slap) {
// does contact have a salmon endpoint?
if(! strlen($url))
return;
if(! $owner['channel_prvkey']) {
logger(sprintf("channel '%s' (%d) does not have a salmon private key. Send failed.",
$owner['channel_address'],$owner['channel_id']));
return;
}
logger('slapper called for ' .$url . '. Data: ' . $slap, LOGGER_DATA, LOG_DEBUG);
// create a magic envelope
$data = base64url_encode($slap);
$data_type = 'application/atom+xml';
$encoding = 'base64url';
$algorithm = 'RSA-SHA256';
$keyhash = base64url_encode(hash('sha256',salmon_key($owner['channel_pubkey'])),true);
// precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
$precomputed = '.YXBwbGljYXRpb24vYXRvbSt4bWw=.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
$signature = base64url_encode(rsa_sign(str_replace('=','',$data . $precomputed),$owner['channel_prvkey']));
$signature2 = base64url_encode(rsa_sign($data . $precomputed,$owner['channel_prvkey']));
$signature3 = base64url_encode(rsa_sign($data,$owner['channel_prvkey']));
$salmon_tpl = get_markup_template('magicsig.tpl');
$salmon = replace_macros($salmon_tpl,array(
'$data' => $data,
'$encoding' => $encoding,
'$algorithm' => $algorithm,
'$keyhash' => $keyhash,
'$signature' => $signature
));
// slap them
$redirects = 0;
$ret = z_post_url($url,$salmon, $redirects, array('headers' => array(
'Content-type: application/magic-envelope+xml',
'Content-length: ' . strlen($salmon))
));
$return_code = $ret['return_code'];
// check for success, e.g. 2xx
if($return_code > 299) {
logger('compliant salmon failed. Falling back to status.net hack2');
// Entirely likely that their salmon implementation is
// non-compliant. Let's try once more, this time only signing
// the data, without stripping '=' chars
$salmon = replace_macros($salmon_tpl,array(
'$data' => $data,
'$encoding' => $encoding,
'$algorithm' => $algorithm,
'$keyhash' => $keyhash,
'$signature' => $signature2
));
$redirects = 0;
$ret = z_post_url($url,$salmon, $redirects, array('headers' => array(
'Content-type: application/magic-envelope+xml',
'Content-length: ' . strlen($salmon))
));
$return_code = $ret['return_code'];
if($return_code > 299) {
logger('compliant salmon failed. Falling back to status.net hack3');
// Entirely likely that their salmon implementation is
// non-compliant. Let's try once more, this time only signing
// the data, without the precomputed blob
$salmon = replace_macros($salmon_tpl,array(
'$data' => $data,
'$encoding' => $encoding,
'$algorithm' => $algorithm,
'$keyhash' => $keyhash,
'$signature' => $signature3
));
$redirects = 0;
$ret = z_post_url($url,$salmon, $redirects, array('headers' => array(
'Content-type: application/magic-envelope+xml',
'Content-length: ' . strlen($salmon))
));
$return_code = $ret['return_code'];
}
}
logger('slapper for ' . $url . ' returned ' . $return_code);
if(! $return_code)
return(-1);
if(($return_code == 503) && (stristr($ret['header'],'retry-after')))
return(-1);
return ((($return_code >= 200) && ($return_code < 300)) ? 0 : 1);
}
|
