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Further clean up code, implement signature checking

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Graham Christensen 2017-12-20 22:40:24 -05:00
parent 0f711738bd
commit faa0f0ae5f
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GPG key ID: ACA1C1D120C83D5C
5 changed files with 192 additions and 1738 deletions
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3
php/composer.json
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@ -7,8 +7,5 @@
"minimum-stability": "dev",
"autoload": {
"psr-4": {"GHE\\": "src/"}
},
"require-dev": {
"phpunit/phpunit": "^6.4"
}
}

1560
php/composer.lock generated
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15
php/mass-rebuild-filter.php
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@ -31,21 +31,6 @@ function runner($msg) {
echo "Msg Sha: " . md5($msg->body) . "\n";
$in = json_decode($msg->body);
try {
$etype = \GHE\EventClassifier::classifyEvent($in);
if ($etype != "pull_request") {
echo "Skipping event type: $etype\n";
$msg->delivery_info['channel']->basic_ack($msg->delivery_info['delivery_tag']);
return true;
}
} catch (\GHE\EventClassifierUnknownException $e) {
echo "Skipping unknown event type\n";
print_r($in);
$msg->delivery_info['channel']->basic_ack($msg->delivery_info['delivery_tag']);
return true;
}
if (!\GHE\ACL::isRepoEligible($in->repository->full_name)) {
echo "Repo not authorized (" . $in->repository->full_name . ")\n";
$msg->delivery_info['channel']->basic_ack($msg->delivery_info['delivery_tag']);

185
php/src/EventClassifier.php
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@ -1,185 +0,0 @@
<?php
namespace GHE;
class EventClassifier {
public static function classifyEvent($payload) {
if (self::isIssuesEvent($payload)) {
return "issues";
}
if (self::isIssueComment($payload)) {
return "issue_comment";
}
if (self::isCommitComment($payload)) {
return "commit_comment";
}
if (self::isPullRequestReviewComment($payload)) {
return "pull_request_review_comment";
}
if (self::isPullRequestReviewEvent($payload)) {
return "pull_request_review";
}
if (self::isPullRequestEvent($payload)) {
return "pull_request";
}
if (self::isStatusEvent($payload)) {
return "status";
}
if (self::isPushEvent($payload)) {
return "push";
}
if (self::isWatchEvent($payload)) {
return "watch";
}
if (self::isForkEvent($payload)) {
return "fork";
}
if (self::isCreateEvent($payload)) {
return "create";
}
if (self::isDeleteEvent($payload)) {
return "delete";
}
if (self::isProjectEvent($payload)) {
return "project";
}
if (self::isProjectCardEvent($payload)) {
return "project_card";
}
if (self::isProjectColumnEvent($payload)) {
return "project_column";
}
if (self::isLabelEvent($payload)) {
return "label";
}
throw new EventClassifierUnknownException();
}
public static function isIssuesEvent($payload) {
return isset($payload->issue)
&& !isset($payload->comment)
&& isset($payload->action)
&& in_array($payload->action,
[ "assigned", "unassigned", "labeled",
"unlabeled", "opened", "edited",
"milestoned", "demilestoned", "closed",
"reopened" ]);
}
public static function isIssueComment($payload) {
return isset($payload->issue)
&& isset($payload->comment)
&& isset($payload->action)
&& in_array($payload->action,
['created', 'edited', 'deleted']);
}
public static function isCommitComment($payload) {
return !isset($payload->issue)
&& !isset($payload->pull_request)
&& isset($payload->comment)
&& isset($payload->action);
}
public static function isPullRequestReviewComment($payload) {
return !isset($payload->issue)
&& isset($payload->pull_request)
&& isset($payload->comment)
&& isset($payload->action)
&& in_array($payload->action,
['created', 'edited', 'deleted']);
}
public static function isPullRequestReviewEvent($payload) {
return isset($payload->review)
&& isset($payload->pull_request)
&& isset($payload->action)
&& in_array($payload->action,
['submitted', 'edited', 'dismissed']);
}
public static function isPullRequestEvent($payload) {
return isset($payload->number)
&& isset($payload->pull_request)
&& isset($payload->action)
&& in_array($payload->action,
[ "assigned", "unassigned",
"review_requested",
"review_request_removed", "labeled",
"unlabeled", "opened", "edited", "closed",
"reopened", "synchronize" ]);
}
public static function isStatusEvent($payload) {
return isset($payload->sha)
&& isset($payload->commit)
&& isset($payload->state)
&& in_array($payload->state,
['pending', 'success', 'failure', 'error']);
}
public static function isPushEvent($payload) {
return isset($payload->before)
&& isset($payload->after);
}
public static function isWatchEvent($payload) {
return isset($payload->action)
&& $payload->action == "started";
}
public static function isForkEvent($payload) {
return isset($payload->forkee);
}
public static function isCreateEvent($payload) {
return isset($payload->ref_type)
&& isset($payload->ref)
&& isset($payload->master_branch);
}
public static function isDeleteEvent($payload) {
return isset($payload->ref_type)
&& isset($payload->ref)
&& !isset($payload->master_branch);
}
public static function isProjectEvent($payload) {
return isset($payload->project);
}
public static function isProjectCardEvent($payload) {
return isset($payload->project_card);
}
public static function isProjectColumnEvent($payload) {
return isset($payload->project_column);
}
public static function isLabelEvent($payload) {
return isset($payload->label)
&& isset($payload->action)
&& in_array($payload->action,
['created', 'edited', 'deleted']);
}
}
class EventClassifierUnknownException extends \Exception{};

169
php/web/index.php
View file

@ -1,44 +1,153 @@
<?php
ob_start();
require_once __DIR__ . '/../config.php';
use PhpAmqpLib\Message\AMQPMessage;
$connection = rabbitmq_conn();
$channel = $connection->channel();
class DumpableException extends \Exception{}
class InvalidPayloadException extends DumpableException {}
class InvalidSignatureException extends DumpableException {}
class InvalidEventTypeException extends DumpableException {}
class ValidationFailureException extends DumpableException {}
class ExecutionFailureException extends DumpableException {}
$raw = file_get_contents('php://input');
$input = json_decode($raw);
if (!isset($input->repository->full_name)) {
echo "no full_name set?";
exit();
} else {
echo "full_name present\n";
function payload() {
if (!isset($_SERVER)) {
throw new InvalidPayloadException('_SERVER undefined');
}
if (!isset($_SERVER['CONTENT_TYPE'])) {
throw new InvalidPayloadException('CONTENT_TYPE not set in _SERVER');
}
switch ($_SERVER['CONTENT_TYPE']) {
case 'application/json':
$input = file_get_contents('php://input');
if ($input === false) {
throw new InvalidPayloadException('Failed to read php://input for application/json');
} else {
return $input;
}
case 'application/x-www-form-urlencoded':
if (!isset($_POST)) {
throw new InvalidPayloadException('_POST undefined');
}
if (!isset($_POST['payload'])) {
throw new InvalidPayloadException('payload not set in _POST');
}
return $_POST['payload'];
default:
throw new InvalidPayloadException('Unsupported content type: ' . $_SERVER['HTTP_CONTENT_TYPE']);
}
}
$name = strtolower($input->repository->full_name);
if (!GHE\ACL::isRepoEligible($name)) {
echo "repo not in ok name list";
exit(1);
} else {
echo "full_name ok\n";
function signature() {
if (!isset($_SERVER)) {
throw new InvalidSignatureException('_SERVER undefined');
}
if (!isset($_SERVER['HTTP_X_HUB_SIGNATURE'])) {
throw new InvalidSignatureException('HTTP_X_HUB_SIGNATURE absent from _SERVER');
}
return $_SERVER['HTTP_X_HUB_SIGNATURE'];
}
$dec = $channel->exchange_declare('github-events', 'topic', false, true, false);
function event_type() {
if (!isset($_SERVER)) {
throw new InvalidEventTypeException('_SERVER undefined');
}
$message = new AMQPMessage(json_encode($input),
array(
'content_type' => 'application/json',
'delivery_mode' => AMQPMessage::DELIVERY_MODE_PERSISTENT,
));
if (!isset($_SERVER['HTTP_X_GITHUB_EVENT'])) {
throw new InvalidEventTypeException('HTTP_X_GITHUB_EVENT absent from _SERVER');
}
$type = trim($_SERVER['HTTP_X_GITHUB_EVENT']);
if (strlen($type) === 0) {
throw new InvalidEventTypeException('After trimming, event type is zero-length');
}
return $type;
}
function validate_payload_signature($secret, $payload, $signature) {
if (!extension_loaded('hash')) {
throw new ValidationFailureException('Missing hash extension');
}
$components = explode('=', $signature, 2);
if (count($components) != 2) {
throw new ValidationFailureException('Provided signature seems invalid after splitting on =');
}
$algo = $components[0];
$provided_hash = $components[1];
if (!in_array($algo, hash_algos(), true)) {
throw new ValidationFailureException("Hash algorithm '$algo' is not supported by the extension.");
}
$ok_algos = [
'sha1',
'sha256',
'sha512',
];
if (!in_array($algo, $ok_algos, true)) {
throw new ValidationFailureException("Hash algorithm '$algo' is not considered okay");
}
$calculated_hash = hash_hmac($algo, $payload, $secret);
return hash_equals($provided_hash, $calculated_hash);
}
try {
$etype = \GHE\EventClassifier::classifyEvent($input);
} catch (\GHE\EventClassifierUnknownException $e) {
$etype = "unknown";
$raw = payload();
if (!validate_payload_signature(gh_secret(), $raw, signature())) {
throw new ExecutionFailureException('Failed to validate signature');
}
$input = json_decode($raw);
if ($input === null) {
throw new ExecutionFailureException('Failed to decode the JSON');
}
if (!isset($input->repository)) {
throw new\ExecutionFailureException('Dataset does not have a repository');
}
if (!isset($input->repository->full_name)) {
throw new ExecutionFailureException('Dataset repository does not have a name');
}
$name = strtolower($input->repository->full_name);
$eventtype = event_type();
$connection = rabbitmq_conn();
$channel = $connection->channel();
$dec = $channel->exchange_declare('github-events', 'topic', false, true, false);
$message = new AMQPMessage(json_encode($input),
array(
'content_type' => 'application/json',
'delivery_mode' => AMQPMessage::DELIVERY_MODE_PERSISTENT,
));
$routing_key = "$eventtype.$name";
$rec = $channel->basic_publish($message, 'github-events', $routing_key);
echo "ok";
} catch (DumpableException $e) {
header($_SERVER["SERVER_PROTOCOL"]." 400 Eh", true, 400);
var_dump($e);
echo ob_get_clean();
} catch (\Exception $e) {
header($_SERVER["SERVER_PROTOCOL"]." 400 Meh", true, 400);
var_dump(get_class($e));
echo ob_get_clean();
}
$routing_key = "$etype.$name";
var_dump($routing_key);
$rec = $channel->basic_publish($message, 'github-events', $routing_key);
echo "ok";