update signature checking for relayables
This commit is contained in:
Zach Prezkuta
parent
4faf0e609f
commit
09eb52810b
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@ -1060,39 +1060,59 @@ function diaspora_comment($importer,$xml,$msg) {
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}
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$parent_item = $r[0];
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$author_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle;
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$author_signature = base64_decode($author_signature);
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/* How Diaspora performs comment signature checking:
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if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
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$person = $contact;
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$key = $msg['key'];
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}
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else {
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$person = find_diaspora_person_by_handle($diaspora_handle);
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- If an item has been sent by the comment author to the top-level post owner to relay on
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to the rest of the contacts on the top-level post, the top-level post owner should check
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the author_signature, then create a parent_author_signature before relaying the comment on
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- If an item has been relayed on by the top-level post owner, the contacts who receive it
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check only the parent_author_signature. Basically, they trust that the top-level post
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owner has already verified the authenticity of anything he/she sends out
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- In either case, the signature that get checked is the signature created by the person
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who sent the salmon
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*/
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if(is_array($person) && x($person,'pubkey'))
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$key = $person['pubkey'];
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else {
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logger('diaspora_comment: unable to find author details');
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return;
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}
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}
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if(! rsa_verify($author_signed_data,$author_signature,$key,'sha256')) {
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logger('diaspora_comment: verification failed.');
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return;
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}
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$signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle;
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$key = $msg['key'];
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if($parent_author_signature) {
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$owner_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle;
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// If a parent_author_signature exists, then we've received the comment
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// relayed from the top-level post owner. There's no need to check the
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// author_signature if the parent_author_signature is valid
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$parent_author_signature = base64_decode($parent_author_signature);
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$key = $msg['key'];
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if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
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logger('diaspora_comment: top-level owner verification failed.');
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return;
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}
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}
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else {
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// If there's no parent_author_signature, then we've received the comment
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// from the comment creator. In that case, the person is commenting on
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// our post, so he/she must be a contact of ours and his/her public key
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// should be in $msg['key']
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if(! rsa_verify($owner_signed_data,$parent_author_signature,$key,'sha256')) {
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logger('diaspora_comment: owner verification failed.');
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/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
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$person = $contact;
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$key = $msg['key'];
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}
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else {
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$person = find_diaspora_person_by_handle($diaspora_handle);
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if(is_array($person) && x($person,'pubkey'))
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$key = $person['pubkey'];
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else {
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logger('diaspora_comment: unable to find author details');
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return;
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}
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}*/
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$author_signature = base64_decode($author_signature);
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if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) {
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logger('diaspora_comment: comment author verification failed.');
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return;
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}
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}
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@ -1613,7 +1633,7 @@ function diaspora_like($importer,$xml,$msg) {
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intval($r[0]['id']),
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intval($importer['uid'])
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);*/
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// FIXME
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// FIXME--actually don't unless it turns out that Diaspora does indeed send out "false" likes
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// send notification via proc_run()
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return;
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}
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@ -1626,39 +1646,58 @@ function diaspora_like($importer,$xml,$msg) {
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return;
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}
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/* How Diaspora performs "like" signature checking:
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- If an item has been sent by the like author to the top-level post owner to relay on
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to the rest of the contacts on the top-level post, the top-level post owner should check
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the author_signature, then create a parent_author_signature before relaying the like on
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- If an item has been relayed on by the top-level post owner, the contacts who receive it
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check only the parent_author_signature. Basically, they trust that the top-level post
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owner has already verified the authenticity of anything he/she sends out
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- In either case, the signature that get checked is the signature created by the person
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who sent the salmon
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*/
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$signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle;
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$author_signature = base64_decode($author_signature);
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if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
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$person = $contact;
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$key = $msg['key'];
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}
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else {
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$person = find_diaspora_person_by_handle($diaspora_handle);
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if(is_array($person) && x($person,'pubkey'))
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$key = $person['pubkey'];
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else {
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logger('diaspora_like: unable to find author details');
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return;
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}
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}
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if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) {
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logger('diaspora_like: verification failed.');
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return;
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}
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$key = $msg['key'];
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if($parent_author_signature) {
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//$owner_signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle;
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// If a parent_author_signature exists, then we've received the like
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// relayed from the top-level post owner. There's no need to check the
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// author_signature if the parent_author_signature is valid
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$parent_author_signature = base64_decode($parent_author_signature);
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$key = $msg['key'];
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if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
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logger('diaspora_like: owner verification failed.');
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logger('diaspora_like: top-level owner verification failed.');
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return;
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}
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}
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else {
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// If there's no parent_author_signature, then we've received the like
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// from the like creator. In that case, the person is "like"ing
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// our post, so he/she must be a contact of ours and his/her public key
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// should be in $msg['key']
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/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
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$person = $contact;
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$key = $msg['key'];
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}
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else {
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$person = find_diaspora_person_by_handle($diaspora_handle);
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if(is_array($person) && x($person,'pubkey'))
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$key = $person['pubkey'];
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else {
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logger('diaspora_like: unable to find author details');
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return;
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}
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}*/
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$author_signature = base64_decode($author_signature);
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if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) {
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logger('diaspora_like: like creator verification failed.');
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return;
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}
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}
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@ -1802,40 +1841,54 @@ function diaspora_signed_retraction($importer,$xml,$msg) {
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$signed_data = $guid . ';' . $type ;
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$key = $msg['key'];
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$sig_decode = base64_decode($sig);
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/* How Diaspora performs relayable_retraction signature checking:
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if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
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$person = $contact;
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$key = $msg['key'];
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}
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else {
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$person = find_diaspora_person_by_handle($diaspora_handle);
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if(is_array($person) && x($person,'pubkey'))
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$key = $person['pubkey'];
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else {
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logger('diaspora_signed_retraction: unable to find author details');
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return;
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}
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}
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if(! rsa_verify($signed_data,$sig_decode,$key,'sha256')) {
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logger('diaspora_signed_retraction: retraction-owner verification failed.' . print_r($msg,true));
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return;
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}
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- If an item has been sent by the item author to the top-level post owner to relay on
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to the rest of the contacts on the top-level post, the top-level post owner checks
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the author_signature, then creates a parent_author_signature before relaying the item on
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- If an item has been relayed on by the top-level post owner, the contacts who receive it
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check only the parent_author_signature. Basically, they trust that the top-level post
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owner has already verified the authenticity of anything he/she sends out
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- In either case, the signature that get checked is the signature created by the person
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who sent the salmon
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*/
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if($parent_author_signature) {
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$parent_author_signature = base64_decode($parent_author_signature);
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$key = $msg['key'];
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if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
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logger('diaspora_signed_retraction: failed to verify person relaying the retraction (e.g. owner of a post relaying a retracted comment');
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logger('diaspora_signed_retraction: top-level post owner verification failed');
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return;
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}
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}
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else {
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/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
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$person = $contact;
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$key = $msg['key'];
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}
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else {
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$person = find_diaspora_person_by_handle($diaspora_handle);
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if(is_array($person) && x($person,'pubkey'))
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$key = $person['pubkey'];
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else {
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logger('diaspora_signed_retraction: unable to find author details');
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return;
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}
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}*/
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$sig_decode = base64_decode($sig);
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if(! rsa_verify($signed_data,$sig_decode,$key,'sha256')) {
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logger('diaspora_signed_retraction: retraction owner verification failed.' . print_r($msg,true));
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return;
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}
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}
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if($type === 'StatusMessage' || $type === 'Comment' || $type === 'Like') {
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$r = q("select * from item where guid = '%s' and uid = %d and not file like '%%[%%' limit 1",
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