190 lines
4.1 KiB
PHP
190 lines
4.1 KiB
PHP
<?php
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function zot_get($url,$args) {
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$argstr = '';
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foreach($args as $k => $v) {
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if($argstr)
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$argstr .= '&';
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$argstr .= $k . '=' . $v;
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}
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$s = fetch_url($url . '?' . $argstr);
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if($s) {
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$j = json_decode($s);
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if($j)
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return($j);
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}
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return false;
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}
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function zot_post($url,$args) {
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$s = post_url($url,$args);
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if($s) {
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$j = json_decode($s);
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if($j)
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return($j);
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}
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return false;
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}
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function zot_prv_encode($s,$prvkey) {
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$x = '';
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$res = openssl_private_encrypt($s,$x,$prvkey);
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return base64url_encode($y);
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}
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function zot_pub_encode($s,$pubkey) {
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$x = '';
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$res = openssl_public_encrypt($s,$x,$pubkey);
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return base64url_encode($x);
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}
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function zot_prv_decode($s,$prvkey) {
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$s = base64url_decode($s);
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$x = '';
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openssl_private_decrypt($s,$x,$prvkey);
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return $x;
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}
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function zot_pub_decode($s,$pubkey) {
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$s = base64url_decode($s);
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$x = '';
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openssl_public_decrypt($s,$x,$pubkey);
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return $x;
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}
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function zot_getzid($url,$myaddress,$myprvkey) {
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$ret = array();
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$j = zot_get($url,array('sender' => $myaddress));
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if($j->zid_encoded)
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$ret['zid'] = zot_prv_decode($j->zid_encoded,$myprvkey);
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if($j->zkey_encoded)
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$ret['zkey'] = zot_prv_decode($j->zkey_encoded,$myprvkey);
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return $ret;
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}
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function zot_post_init($url,$zid,$myprvkey,$theirpubkey) {
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$ret = array();
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$zinit = random_string(32);
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$j = zot_get($url,array('zid' => $zid,'zinit' => $zinit));
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$a = get_app();
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if(! $a->get_curl_code())
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return ZCURL_TIMEOUT;
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if(! $j->zinit) {
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logger('zot_post_init: no zinit returned.');
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return false;
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}
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if(zot_pub_decode($j->zinit,$thierpubkey) !== $zinit) {
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logger('zot_post_init: incorrect zinit returned.');
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return false;
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}
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if($j->challenge) {
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$s = zot_prv_decode($j->challenge,$myprvkey);
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$s1 = substr($s,0,strpos($s,'.'));
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if($s1 != $zid) {
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logger("zot_post_init: incorrect zid returned");
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return false;
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}
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$ret['result'] = substr($s,strpos($s,'.') + 1);
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$ret['perms'] = $j->perms;
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}
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return $ret;
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}
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function zot_encrypt_data($data,&$key) {
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$key = random_string();
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return aes_encrypt($data,$key);
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}
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// encrypt the data prior to calling this function so it only need be done once per message
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// regardless of the number of recipients.
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function zot_post_data($url,$zid,$myprvkey,$theirpubkey,$encrypted_data,$key, $intro = false) {
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$i = zot_post_init($url,$zid,$myprvkey,$theirpubkey);
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if($i === ZCURL_TIMEOUT)
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return ZCURL_TIMEOUT;
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if((! $i) || (! array_key_exists('perms',$i)) || (! array_key_exists('result',$i)))
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return false;
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if((! stristr($i['perms'],'post')) && ($intro === false)) {
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logger("zot_post_data: no permission to post: url=$url zid=$zid");
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return false;
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}
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$p = array();
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$p['zid'] = $zid;
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$p['result'] = zot_pub_encode($i['result'],$theirpubkey);
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$p['aes_key'] = zot_prv_encode($key,$myprvkey);
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$p['data'] = $encrypted_data;
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$s = zot_post($url,$p);
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$a = get_app();
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if(! $a->get_curl_code())
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return ZCURL_TIMEOUT;
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if($s) {
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$j = json_decode($s);
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return $j;
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}
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return false;
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}
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function zot_deliver($recipients,$myprvkey,$data) {
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if(is_array($recipients) && count($recipients)) {
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$key = '';
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$encrypted = zot_encrypt_data($data,$key);
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foreach($recipients as $r) {
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$result = zot_post_data(
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$r['post'],
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$r['zid'],
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$myprvkey,
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$r['pubkey'],
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$encrypted,
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$key
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);
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if($result === false) {
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// post failed
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logger('zot_deliver: failed: ' . print_r($r,true));
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}
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elseif($result === ZCURL_TIMEOUT) {
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// queue for redelivery
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}
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elseif($result->error) {
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// failed at other end
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logger('zot_deliver: remote failure: ' . $result->error . ' ' . print_r($r,true));
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}
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elseif($result->success) {
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logger('zot_deliver: success ' . print_r($r,true, LOGGER_DEBUG));
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}
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else
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logger('zot_deliver: unknown failure.');
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}
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}
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}
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function zot_new_contact($user,$cc) {
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$zid = random_string(32);
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$zkey = random_string(32);
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logger("zot_new_contact: zid=$zid zkey=$zkey uid={$user['uid']} " . print_r($cc,true));
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$ret = array();
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$ret['zid_encoded'] = zot_pub_encode($zid,$cc['pubkey']);
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$ret['zkey_encoded'] = zot_pub_encode($zkey,$cc['pubkey']);
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return $ret;
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} |