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api.js
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const { auth, errors, policies } = require('arsenal');
const async = require('async');
const busboy = require('@fastify/busboy');
const bucketDelete = require('./bucketDelete');
const bucketDeleteCors = require('./bucketDeleteCors');
const bucketDeleteEncryption = require('./bucketDeleteEncryption');
const bucketDeleteWebsite = require('./bucketDeleteWebsite');
const bucketDeleteLifecycle = require('./bucketDeleteLifecycle');
const bucketDeletePolicy = require('./bucketDeletePolicy');
const bucketGet = require('./bucketGet');
const bucketGetACL = require('./bucketGetACL');
const bucketGetCors = require('./bucketGetCors');
const bucketGetVersioning = require('./bucketGetVersioning');
const bucketGetWebsite = require('./bucketGetWebsite');
const bucketGetLocation = require('./bucketGetLocation');
const bucketGetLifecycle = require('./bucketGetLifecycle');
const bucketGetNotification = require('./bucketGetNotification');
const bucketGetObjectLock = require('./bucketGetObjectLock');
const bucketGetPolicy = require('./bucketGetPolicy');
const bucketGetEncryption = require('./bucketGetEncryption');
const bucketHead = require('./bucketHead');
const { bucketPut } = require('./bucketPut');
const bucketPutACL = require('./bucketPutACL');
const bucketPutCors = require('./bucketPutCors');
const bucketPutVersioning = require('./bucketPutVersioning');
const bucketPutTagging = require('./bucketPutTagging');
const bucketDeleteTagging = require('./bucketDeleteTagging');
const bucketGetTagging = require('./bucketGetTagging');
const bucketPutWebsite = require('./bucketPutWebsite');
const bucketPutReplication = require('./bucketPutReplication');
const bucketPutLifecycle = require('./bucketPutLifecycle');
const bucketPutNotification = require('./bucketPutNotification');
const bucketPutEncryption = require('./bucketPutEncryption');
const bucketPutPolicy = require('./bucketPutPolicy');
const bucketPutObjectLock = require('./bucketPutObjectLock');
const bucketGetReplication = require('./bucketGetReplication');
const bucketDeleteReplication = require('./bucketDeleteReplication');
const corsPreflight = require('./corsPreflight');
const completeMultipartUpload = require('./completeMultipartUpload');
const initiateMultipartUpload = require('./initiateMultipartUpload');
const listMultipartUploads = require('./listMultipartUploads');
const listParts = require('./listParts');
const { multiObjectDelete } = require('./multiObjectDelete');
const multipartDelete = require('./multipartDelete');
const objectCopy = require('./objectCopy');
const objectDelete = require('./objectDelete');
const objectDeleteTagging = require('./objectDeleteTagging');
const objectGet = require('./objectGet');
const objectGetACL = require('./objectGetACL');
const objectGetLegalHold = require('./objectGetLegalHold');
const objectGetRetention = require('./objectGetRetention');
const objectGetTagging = require('./objectGetTagging');
const objectHead = require('./objectHead');
const objectPut = require('./objectPut');
const objectPost = require('./objectPost');
const objectPutACL = require('./objectPutACL');
const objectPutLegalHold = require('./objectPutLegalHold');
const objectPutTagging = require('./objectPutTagging');
const objectPutPart = require('./objectPutPart');
const objectPutCopyPart = require('./objectPutCopyPart');
const objectPutRetention = require('./objectPutRetention');
const prepareRequestContexts
= require('./apiUtils/authorization/prepareRequestContexts');
const serviceGet = require('./serviceGet');
const vault = require('../auth/vault');
const website = require('./website');
const writeContinue = require('../utilities/writeContinue');
const validateQueryAndHeaders = require('../utilities/validateQueryAndHeaders');
const parseCopySource = require('./apiUtils/object/parseCopySource');
const { tagConditionKeyAuth } = require('./apiUtils/authorization/tagConditionKeys');
const checkHttpHeadersSize = require('./apiUtils/object/checkHttpHeadersSize');
const monitoringMap = policies.actionMaps.actionMonitoringMapS3;
auth.setHandler(vault);
/* eslint-disable no-param-reassign */
const api = {
callApiMethod(apiMethod, request, response, log, callback) {
// Attach the apiMethod method to the request, so it can used by monitoring in the server
// eslint-disable-next-line no-param-reassign
request.apiMethod = apiMethod;
const actionLog = monitoringMap[apiMethod];
if (!actionLog &&
apiMethod !== 'websiteGet' &&
apiMethod !== 'websiteHead' &&
apiMethod !== 'corsPreflight') {
log.error('callApiMethod(): No actionLog for this api method', {
apiMethod,
});
}
log.addDefaultFields({
service: 's3',
action: actionLog,
bucketName: request.bucketName,
});
if (request.objectKey) {
log.addDefaultFields({
objectKey: request.objectKey,
});
}
let returnTagCount = true;
const validationRes = validateQueryAndHeaders(request, log);
if (validationRes.error) {
log.debug('request query / header validation failed', {
error: validationRes.error,
method: 'api.callApiMethod',
});
return process.nextTick(callback, validationRes.error);
}
// no need to check auth on website or cors preflight requests
if (apiMethod === 'websiteGet' || apiMethod === 'websiteHead' ||
apiMethod === 'corsPreflight') {
request.actionImplicitDenies = false;
return this[apiMethod](request, log, callback);
}
const { sourceBucket, sourceObject, sourceVersionId, parsingError } =
parseCopySource(apiMethod, request.headers['x-amz-copy-source']);
if (parsingError) {
log.debug('error parsing copy source', {
error: parsingError,
});
return process.nextTick(callback, parsingError);
}
const { httpHeadersSizeError } = checkHttpHeadersSize(request.headers);
if (httpHeadersSizeError) {
log.debug('http header size limit exceeded', {
error: httpHeadersSizeError,
});
return process.nextTick(callback, httpHeadersSizeError);
}
const requestContexts = prepareRequestContexts(apiMethod, request,
sourceBucket, sourceObject, sourceVersionId);
// Extract all the _apiMethods and store them in an array
const apiMethods = requestContexts ? requestContexts.map(context => context._apiMethod) : [];
// Attach the names to the current request
// eslint-disable-next-line no-param-reassign
request.apiMethods = apiMethods;
function checkAuthResults(authResults) {
let returnTagCount = true;
const isImplicitDeny = {};
let isOnlyImplicitDeny = true;
if (apiMethod === 'objectGet') {
// first item checks s3:GetObject(Version) action
if (!authResults[0].isAllowed && !authResults[0].isImplicit) {
log.trace('get object authorization denial from Vault');
return errors.AccessDenied;
}
// TODO add support for returnTagCount in the bucket policy
// checks
isImplicitDeny[authResults[0].action] = authResults[0].isImplicit;
// second item checks s3:GetObject(Version)Tagging action
if (!authResults[1].isAllowed) {
log.trace('get tagging authorization denial ' +
'from Vault');
returnTagCount = false;
}
} else {
for (let i = 0; i < authResults.length; i++) {
isImplicitDeny[authResults[i].action] = true;
if (!authResults[i].isAllowed && !authResults[i].isImplicit) {
// Any explicit deny rejects the current API call
log.trace('authorization denial from Vault');
return errors.AccessDenied;
}
if (authResults[i].isAllowed) {
// If the action is allowed, the result is not implicit
// Deny.
isImplicitDeny[authResults[i].action] = false;
isOnlyImplicitDeny = false;
}
}
}
// These two APIs cannot use ACLs or Bucket Policies, hence, any
// implicit deny from vault must be treated as an explicit deny.
if ((apiMethod === 'bucketPut' || apiMethod === 'serviceGet') && isOnlyImplicitDeny) {
return errors.AccessDenied;
}
return { returnTagCount, isImplicitDeny };
}
let bb;
let fileEventData = null;
if (apiMethod === 'objectPost') {
bb = busboy({ headers: request.headers });
}
return async.waterfall([
next => {
if (apiMethod === 'objectPut' || apiMethod === 'objectPutPart') {
return next(null);
}
if (apiMethod === 'objectPost' && request.headers['content-type'].includes('multipart/form-data')) {
writeContinue(request, response);
let algoOK = false;
let credOK = false;
let dateOK = false;
let sigOK = false;
let policyOK = false;
request.formData = {};
let totalFieldSize = 0;
const MAX_FIELD_SIZE = 20 * 1024; // 20KB
bb.on('field', (fieldname, val) => {
totalFieldSize += Buffer.byteLength(val, 'utf8');
if (totalFieldSize > MAX_FIELD_SIZE) {
const err = errors.MaxPostPreDataLengthExceeded;
bb.emit('error', err);
}
// Convert fieldname to lowercase for case-insensitive comparison
const lowerFieldname = fieldname.toLowerCase();
request.formData[lowerFieldname] = val;
if (lowerFieldname === 'x-amz-algorithm') {
algoOK = true;
}
if (lowerFieldname === 'x-amz-credential') {
credOK = true;
}
if (lowerFieldname === 'x-amz-date') {
dateOK = true;
}
if (lowerFieldname === 'x-amz-signature') {
sigOK = true;
}
if (lowerFieldname === 'policy') {
policyOK = true;
}
});
bb.on('file', (fieldname, file, filename, encoding, mimetype) => {
fileEventData = { fieldname, file, filename, encoding, mimetype };
if (algoOK && credOK && dateOK && sigOK && policyOK) {
return next(null);
}
return undefined;
});
bb.on('finish', () => {
// if fields are found but no file, continue
if ((algoOK && credOK && dateOK && sigOK && policyOK) && !fileEventData) {
return next(null);
}
return undefined;
});
bb.on('error', (err) => {
log.trace('Error processing form data:', {
error: err,
});
request.unpipe(bb);
return next(err);
});
request.pipe(bb);
} else {
// issue 100 Continue to the client
writeContinue(request, response);
const MAX_POST_LENGTH = request.method === 'POST' ?
1024 * 1024 : 1024 * 1024 / 2; // 1 MB or 512 KB
const post = [];
let postLength = 0;
request.on('data', chunk => {
postLength += chunk.length;
// Sanity check on post length
if (postLength <= MAX_POST_LENGTH) {
post.push(chunk);
}
});
request.on('error', err => {
log.trace('error receiving request', {
error: err,
});
return next(errors.InternalError);
});
request.on('end', () => {
if (postLength > MAX_POST_LENGTH) {
log.error('body length is too long for request type',
{ postLength });
return next(errors.InvalidRequest);
}
request.post = Buffer.concat(post, postLength).toString();
return next(null);
});
}
return undefined;
},
next => auth.server.doAuth(
request, log, (err, userInfo, authorizationResults, streamingV4Params) => {
if (err) {
log.trace('authentication error', { error: err });
return next(err);
}
return next(null, userInfo, authorizationResults, streamingV4Params);
}, 's3', requestContexts),
(userInfo, authorizationResults, streamingV4Params, next) => {
const authNames = { accountName: userInfo.getAccountDisplayName() };
if (userInfo.isRequesterAnIAMUser()) {
authNames.userName = userInfo.getIAMdisplayName();
}
log.addDefaultFields(authNames);
return next(null, userInfo, authorizationResults, streamingV4Params);
},
// Tag condition keys require information from CloudServer for evaluation
(userInfo, authorizationResults, streamingV4Params, next) => tagConditionKeyAuth(
authorizationResults,
request,
requestContexts,
apiMethod,
log,
(err, authResultsWithTags) => {
if (err) {
log.trace('tag authentication error', { error: err });
return next(err);
}
return next(null, userInfo, authResultsWithTags, streamingV4Params);
},
),
], (err, userInfo, authorizationResults, streamingV4Params) => {
if (err) {
return callback(err);
}
if (authorizationResults) {
const checkedResults = checkAuthResults(authorizationResults);
if (checkedResults instanceof Error) {
return callback(checkedResults);
}
returnTagCount = checkedResults.returnTagCount;
request.actionImplicitDenies = checkedResults.isImplicitDeny;
} else {
// create an object of keys apiMethods with all values to false:
// for backward compatibility, all apiMethods are allowed by default
// thus it is explicitly allowed, so implicit deny is false
request.actionImplicitDenies = apiMethods.reduce((acc, curr) => {
acc[curr] = false;
return acc;
}, {});
}
if (apiMethod === 'objectPost') {
request._response = response;
if (fileEventData) {
request.fileEventData = fileEventData;
request.headers['content-type'] = fileEventData.mimetype;
}
return this[apiMethod](userInfo, request, streamingV4Params,
log, callback, authorizationResults);
}
if (apiMethod === 'objectPut' || apiMethod === 'objectPutPart') {
request._response = response;
return this[apiMethod](userInfo, request, streamingV4Params,
log, callback, authorizationResults);
}
if (apiMethod === 'objectCopy' || apiMethod === 'objectPutCopyPart') {
return this[apiMethod](userInfo, request, sourceBucket,
sourceObject, sourceVersionId, log, callback);
}
if (apiMethod === 'objectGet') {
return this[apiMethod](userInfo, request, returnTagCount, log, callback);
}
return this[apiMethod](userInfo, request, log, callback);
});
},
bucketDelete,
bucketDeleteCors,
bucketDeleteEncryption,
bucketDeleteWebsite,
bucketGet,
bucketGetACL,
bucketGetCors,
bucketGetObjectLock,
bucketGetVersioning,
bucketGetWebsite,
bucketGetLocation,
bucketGetEncryption,
bucketHead,
bucketPut,
bucketPutACL,
bucketPutCors,
bucketPutVersioning,
bucketPutTagging,
bucketGetTagging,
bucketPutWebsite,
bucketPutReplication,
bucketGetReplication,
bucketDeleteReplication,
bucketPutLifecycle,
bucketGetLifecycle,
bucketDeleteLifecycle,
bucketPutPolicy,
bucketGetPolicy,
bucketDeletePolicy,
bucketDeleteTagging,
bucketPutObjectLock,
bucketPutNotification,
bucketGetNotification,
bucketPutEncryption,
corsPreflight,
completeMultipartUpload,
initiateMultipartUpload,
listMultipartUploads,
listParts,
multiObjectDelete,
multipartDelete,
objectDelete,
objectDeleteTagging,
objectGet,
objectGetACL,
objectGetLegalHold,
objectGetRetention,
objectGetTagging,
objectCopy,
objectHead,
objectPut,
objectPost,
objectPutACL,
objectPutLegalHold,
objectPutTagging,
objectPutPart,
objectPutCopyPart,
objectPutRetention,
serviceGet,
websiteGet: website,
websiteHead: website,
};
module.exports = api;