diff options
| -rwxr-xr-x | include/diaspora.php | 191 |
1 files changed, 122 insertions, 69 deletions
diff --git a/include/diaspora.php b/include/diaspora.php index 1e6662f04..e91ebf442 100755 --- a/include/diaspora.php +++ b/include/diaspora.php @@ -1060,39 +1060,59 @@ function diaspora_comment($importer,$xml,$msg) { } $parent_item = $r[0]; - $author_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle; - $author_signature = base64_decode($author_signature); + /* How Diaspora performs comment signature checking: - if(strcasecmp($diaspora_handle,$msg['author']) == 0) { - $person = $contact; - $key = $msg['key']; - } - else { - $person = find_diaspora_person_by_handle($diaspora_handle); + - If an item has been sent by the comment author to the top-level post owner to relay on + to the rest of the contacts on the top-level post, the top-level post owner should check + the author_signature, then create a parent_author_signature before relaying the comment on + - If an item has been relayed on by the top-level post owner, the contacts who receive it + check only the parent_author_signature. Basically, they trust that the top-level post + owner has already verified the authenticity of anything he/she sends out + - In either case, the signature that get checked is the signature created by the person + who sent the salmon + */ - if(is_array($person) && x($person,'pubkey')) - $key = $person['pubkey']; - else { - logger('diaspora_comment: unable to find author details'); + $signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle; + $key = $msg['key']; + + if($parent_author_signature) { + // If a parent_author_signature exists, then we've received the comment + // relayed from the top-level post owner. There's no need to check the + // author_signature if the parent_author_signature is valid + + $parent_author_signature = base64_decode($parent_author_signature); + + if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) { + logger('diaspora_comment: top-level owner verification failed.'); return; } } + else { + // If there's no parent_author_signature, then we've received the comment + // from the comment creator. In that case, the person is commenting on + // our post, so he/she must be a contact of ours and his/her public key + // should be in $msg['key'] - if(! rsa_verify($author_signed_data,$author_signature,$key,'sha256')) { - logger('diaspora_comment: verification failed.'); - return; - } - - if($parent_author_signature) { - $owner_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle; +/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) { + $person = $contact; + $key = $msg['key']; + } + else { + $person = find_diaspora_person_by_handle($diaspora_handle); - $parent_author_signature = base64_decode($parent_author_signature); + if(is_array($person) && x($person,'pubkey')) + $key = $person['pubkey']; + else { + logger('diaspora_comment: unable to find author details'); + return; + } + }*/ - $key = $msg['key']; + $author_signature = base64_decode($author_signature); - if(! rsa_verify($owner_signed_data,$parent_author_signature,$key,'sha256')) { - logger('diaspora_comment: owner verification failed.'); + if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) { + logger('diaspora_comment: comment author verification failed.'); return; } } @@ -1613,7 +1633,7 @@ function diaspora_like($importer,$xml,$msg) { intval($r[0]['id']), intval($importer['uid']) );*/ - // FIXME + // FIXME--actually don't unless it turns out that Diaspora does indeed send out "false" likes // send notification via proc_run() return; } @@ -1626,39 +1646,58 @@ function diaspora_like($importer,$xml,$msg) { return; } - $signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle; - $author_signature = base64_decode($author_signature); + /* How Diaspora performs "like" signature checking: - if(strcasecmp($diaspora_handle,$msg['author']) == 0) { - $person = $contact; - $key = $msg['key']; - } - else { - $person = find_diaspora_person_by_handle($diaspora_handle); - if(is_array($person) && x($person,'pubkey')) - $key = $person['pubkey']; - else { - logger('diaspora_like: unable to find author details'); - return; - } - } + - If an item has been sent by the like author to the top-level post owner to relay on + to the rest of the contacts on the top-level post, the top-level post owner should check + the author_signature, then create a parent_author_signature before relaying the like on + - If an item has been relayed on by the top-level post owner, the contacts who receive it + check only the parent_author_signature. Basically, they trust that the top-level post + owner has already verified the authenticity of anything he/she sends out + - In either case, the signature that get checked is the signature created by the person + who sent the salmon + */ - if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) { - logger('diaspora_like: verification failed.'); - return; - } + $signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle; + $key = $msg['key']; if($parent_author_signature) { - - //$owner_signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle; + // If a parent_author_signature exists, then we've received the like + // relayed from the top-level post owner. There's no need to check the + // author_signature if the parent_author_signature is valid $parent_author_signature = base64_decode($parent_author_signature); - $key = $msg['key']; - if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) { - logger('diaspora_like: owner verification failed.'); + logger('diaspora_like: top-level owner verification failed.'); + return; + } + } + else { + // If there's no parent_author_signature, then we've received the like + // from the like creator. In that case, the person is "like"ing + // our post, so he/she must be a contact of ours and his/her public key + // should be in $msg['key'] + +/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) { + $person = $contact; + $key = $msg['key']; + } + else { + $person = find_diaspora_person_by_handle($diaspora_handle); + if(is_array($person) && x($person,'pubkey')) + $key = $person['pubkey']; + else { + logger('diaspora_like: unable to find author details'); + return; + } + }*/ + + $author_signature = base64_decode($author_signature); + + if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) { + logger('diaspora_like: like creator verification failed.'); return; } } @@ -1802,39 +1841,53 @@ function diaspora_signed_retraction($importer,$xml,$msg) { $signed_data = $guid . ';' . $type ; + $key = $msg['key']; - $sig_decode = base64_decode($sig); + /* How Diaspora performs relayable_retraction signature checking: - if(strcasecmp($diaspora_handle,$msg['author']) == 0) { - $person = $contact; - $key = $msg['key']; - } - else { - $person = find_diaspora_person_by_handle($diaspora_handle); + - If an item has been sent by the item author to the top-level post owner to relay on + to the rest of the contacts on the top-level post, the top-level post owner checks + the author_signature, then creates a parent_author_signature before relaying the item on + - If an item has been relayed on by the top-level post owner, the contacts who receive it + check only the parent_author_signature. Basically, they trust that the top-level post + owner has already verified the authenticity of anything he/she sends out + - In either case, the signature that get checked is the signature created by the person + who sent the salmon + */ - if(is_array($person) && x($person,'pubkey')) - $key = $person['pubkey']; - else { - logger('diaspora_signed_retraction: unable to find author details'); + if($parent_author_signature) { + + $parent_author_signature = base64_decode($parent_author_signature); + + if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) { + logger('diaspora_signed_retraction: top-level post owner verification failed'); return; } - } - if(! rsa_verify($signed_data,$sig_decode,$key,'sha256')) { - logger('diaspora_signed_retraction: retraction-owner verification failed.' . print_r($msg,true)); - return; } + else { - if($parent_author_signature) { - $parent_author_signature = base64_decode($parent_author_signature); +/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) { + $person = $contact; + $key = $msg['key']; + } + else { + $person = find_diaspora_person_by_handle($diaspora_handle); - $key = $msg['key']; + if(is_array($person) && x($person,'pubkey')) + $key = $person['pubkey']; + else { + logger('diaspora_signed_retraction: unable to find author details'); + return; + } + }*/ - if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) { - logger('diaspora_signed_retraction: failed to verify person relaying the retraction (e.g. owner of a post relaying a retracted comment'); + $sig_decode = base64_decode($sig); + + if(! rsa_verify($signed_data,$sig_decode,$key,'sha256')) { + logger('diaspora_signed_retraction: retraction owner verification failed.' . print_r($msg,true)); return; } - } if($type === 'StatusMessage' || $type === 'Comment' || $type === 'Like') { |