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fix/legacy_http for WebFinger + some minor fixes 

Now won't match possibly maliciously named remote profile URLs
(where the profile URL could be a notice URL for example, which
would mean the response would be incorrect)

When looking up remote entities, we should _only_ use the stored URI,
but that's for the future to do...
This commit is contained in:
Mikael Nordfeldth 2016-03-30 01:32:11 +02:00
parent df3bcbb6cb
commit 299949b156
1 changed files with 67 additions and 30 deletions
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97
plugins/WebFinger/WebFingerPlugin.php
View File

@ -81,49 +81,86 @@ class WebFingerPlugin extends Plugin
$parts = explode('@', substr(urldecode($resource), 5)); // 5 is strlen of 'acct:'
if (count($parts) == 2) {
list($nick, $domain) = $parts;
if ($domain === common_config('site', 'server')) {
$nick = common_canonical_nickname($nick);
$user = User::getKV('nickname', $nick);
if (!($user instanceof User)) {
throw new NoSuchUserException(array('nickname'=>$nick));
}
$profile = $user->getProfile();
} else {
if ($domain !== common_config('site', 'server')) {
throw new Exception(_('Remote profiles not supported via WebFinger yet.'));
}
$nick = common_canonical_nickname($nick);
$user = User::getKV('nickname', $nick);
if (!($user instanceof User)) {
throw new NoSuchUserException(array('nickname'=>$nick));
}
$profile = $user->getProfile();
}
} else {
} elseif (!common_valid_http_url($resource)) {
// If it's not a URL, we can't do our http<->https legacy fix thingie anyway,
// so just try the User URI lookup!
try {
$user = User::getByUri($resource);
$profile = $user->getProfile();
} catch (NoResultException $e) {
if (common_config('fix', 'fancyurls')) {
try {
try { // if it's a /index.php/ url
// common_fake_local_fancy_url can throw an exception
$alt_url = common_fake_local_fancy_url($resource);
} catch (Exception $e) { // let's try to create a fake local /index.php/ url
// this too if it can't do anything about the URL
$alt_url = common_fake_local_nonfancy_url($resource);
}
// and this will throw a NoResultException if not found
$user = User::getByUri($alt_url);
$profile = $user->getProfile();
} catch (Exception $e) {
// apparently we didn't get any matches with that, so continue...
// not a User, maybe a Notice? we'll try that further down...
}
} else {
// this means $resource is a common_valid_http_url (or https)
// First build up a set of alternative resource URLs that we can use.
$alt_urls = [$resource => true];
if (strtolower(parse_url($resource, PHP_URL_SCHEME)) === 'https'
&& common_config('fix', 'legacy_http')) {
$alt_urls[preg_replace('/^https:/i', 'http:', $resource, 1)] = true;
}
if (common_config('fix', 'fancyurls')) {
foreach (array_keys($alt_urls) as $url) {
try { // if it's a /index.php/ url
// common_fake_local_fancy_url can throw an exception
$alt_url = common_fake_local_fancy_url($url);
} catch (Exception $e) { // let's try to create a fake local /index.php/ url
// this too if it can't do anything about the URL
$alt_url = common_fake_local_nonfancy_url($url);
}
$alt_urls[$alt_url] = true;
}
}
common_debug(__METHOD__.': Generated these alternative URLs for various federation fixes: '._ve(array_keys($alt_urls)));
try {
common_debug(__METHOD__.': Finding User URI for WebFinger lookup on resource=='._ve($resource));
$user = new User();
$user->whereAddIn('uri', array_keys($alt_urls), $user->columnType('uri'));
$user->limit(1);
if ($user->find(true)) {
$profile = $user->getProfile();
}
unset($user);
} catch (Exception $e) {
// Most likely a UserNoProfileException, if it ever happens
// and then we need to do some debugging and perhaps fixes.
common_log(LOG_ERR, get_class($e).': '._ve($e->getMessage()));
throw $e;
}
// User URI did not match, so let's try our alt_urls as Profile URL values
if (!$profile instanceof Profile) {
common_debug(__METHOD__.': Finding Profile URLs for WebFinger lookup on resource=='._ve($resource));
// if our rewrite hack didn't work, try to get something by profile URL
$profile = new Profile();
$profile->whereAddIn('profileurl', array_keys($alt_urls), $profile->columnType('profileurl'));
$profile->limit(1);
if (!$profile->find(true) || !$profile->isLocal()) {
// * Either we didn't find the profile, then we want to make
// the $profile variable null for clarity.
// * Or we did find it but for a possibly malicious remote
// user who might've set their profile URL to a Notice URL
// which would've caused a sort of DoS unless we continue
// our search here by discarding the remote profile.
$profile = null;
}
}
}
// if we still haven't found a match...
if (!$profile instanceof Profile) {
// if our rewrite hack didn't work, try to get something by profile URL
$profile = Profile::getKV('profileurl', $resource);
}
if ($profile instanceof Profile) {
common_debug(__METHOD__.': Found Profile with ID=='._ve($profile->getID()).' for resource=='._ve($resource));
$target = new WebFingerResource_Profile($profile);
return false; // We got our target, stop handler execution
}