我在Lambda函数上从S3 AWS服务收到拒绝访问的错误。
这是代码:
// dependencies
var async = require('async');
var AWS = require('aws-sdk');
var gm = require('gm').subClass({ imageMagick: true }); // Enable ImageMagick integration.
exports.handler = function(event, context) {
var srcBucket = event.Records[0].s3.bucket.name;
// Object key may have spaces or unicode non-ASCII characters.
var key = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, " "));
/*
{
originalFilename: <string>,
versions: [
{
size: <number>,
crop: [x,y],
max: [x, y],
rotate: <number>
}
]
}*/
var fileInfo;
var dstBucket = "xmovo.transformedimages.develop";
try {
//TODO: Decompress and decode the returned value
fileInfo = JSON.parse(key);
//download s3File
// get reference to S3 client
var s3 = new AWS.S3();
// Download the image from S3 into a buffer.
s3.getObject({
Bucket: srcBucket,
Key: key
},
function (err, response) {
if (err) {
console.log("Error getting from s3: >>> " + err + "::: Bucket-Key >>>" + srcBucket + "-" + key + ":::Principal>>>" + event.Records[0].userIdentity.principalId, err.stack);
return;
}
// Infer the image type.
var img = gm(response.Body);
var imageType = null;
img.identify(function (err, data) {
if (err) {
console.log("Error image type: >>> " + err);
deleteFromS3(srcBucket, key);
return;
}
imageType = data.format;
//foreach of the versions requested
async.each(fileInfo.versions, function (currentVersion, callback) {
//apply transform
async.waterfall([async.apply(transform, response, currentVersion), uploadToS3, callback]);
}, function (err) {
if (err) console.log("Error on excecution of watefall: >>> " + err);
else {
//when all done then delete the original image from srcBucket
deleteFromS3(srcBucket, key);
}
});
});
});
}
catch (ex){
context.fail("exception through: " + ex);
deleteFromS3(srcBucket, key);
return;
}
function transform(response, version, callback){
var imageProcess = gm(response.Body);
if (version.rotate!=0) imageProcess = imageProcess.rotate("black",version.rotate);
if(version.size!=null) {
if (version.crop != null) {
//crop the image from the coordinates
imageProcess=imageProcess.crop(version.size[0], version.size[1], version.crop[0], version.crop[1]);
}
else {
//find the bigger and resize proportioned the other dimension
var widthIsMax = version.size[0]>version.size[1];
var maxValue = Math.max(version.size[0],version.size[1]);
imageProcess=(widthIsMax)?imageProcess.resize(maxValue):imageProcess.resize(null, maxValue);
}
}
//finally convert the image to jpg 90%
imageProcess.toBuffer("jpg",{quality:90}, function(err, buffer){
if (err) callback(err);
callback(null, version, "image/jpeg", buffer);
});
}
function deleteFromS3(bucket, filename){
s3.deleteObject({
Bucket: bucket,
Key: filename
});
}
function uploadToS3(version, contentType, data, callback) {
// Stream the transformed image to a different S3 bucket.
var dstKey = fileInfo.originalFilename + "_" + version.size + ".jpg";
s3.putObject({
Bucket: dstBucket,
Key: dstKey,
Body: data,
ContentType: contentType
}, callback);
}
};
这是Cloudwatch上的错误:
AccessDenied: Access Denied
这是堆栈错误:
at Request.extractError (/var/runtime/node_modules/aws-sdk/lib/services/s3.js:329:35)
at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:596:14)
at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:21:10)
at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)
at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10
at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:37:9)
at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:598:12)
at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:115:18)
没有任何其他描述或信息对S3存储桶的权限允许每个人放入列表并删除。
如何访问S3存储桶?
PS:在Lambda事件属性上,主体是正确的,并且具有管理特权。
有趣的是,当文件不存在时,AWS返回403(拒绝访问)。确保目标文件在S3存储桶中。
我遇到了这个问题,经过数小时的IAM政策疯狂后,解决方案是:
完成。您精心编写的IAM角色策略无关紧要,特定的存储桶策略也无关紧要(我也写过这些策略以使其起作用)。否则,他们就是不使用我的帐户工作。
[编辑]
经过大量修补后,上述方法并不是最佳方法。试试这个:
{ "Version": "2012-10-17", "Id": "Lambda access bucket policy", "Statement": [ { "Sid": "All on objects in bucket lambda", "Effect": "Allow", "Principal": { "AWS": "arn:aws:iam::AWSACCOUNTID:root" }, "Action": "s3:*", "Resource": "arn:aws:s3:::BUCKET-NAME/*" }, { "Sid": "All on bucket by lambda", "Effect": "Allow", "Principal": { "AWS": "arn:aws:iam::AWSACCOUNTID:root" }, "Action": "s3:*", "Resource": "arn:aws:s3:::BUCKET-NAME" } ] }
[为我工作,不需要您与所有经过身份验证的AWS用户共享(大多数情况下不理想)。
如果您指定Resource,请不要忘记也添加子文件夹规范。像这样:
"Resource": [
"arn:aws:s3:::BUCKET-NAME",
"arn:aws:s3:::BUCKET-NAME/*"
]
我也遇到这个问题,我在ACL试图获取该对象的版本时通过提供s3:GetObject*
来解决此问题。
如果所有其他策略鸭子都排成一行,如果对象不存在并且请求者对存储桶没有ListObjects权限,S3仍将返回拒绝访问消息。
来自https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectGET.html:
...如果您请求的对象不存在,则错误Amazon S3返回值取决于您是否还具有s3:ListBucket权限。
如果您对存储桶具有s3:ListBucket权限,Amazon S3将返回HTTP状态代码404(“无此密钥”)错误。如果你不拥有s3:ListBucket权限,Amazon S3将返回一个HTTP状态代码403(“访问被拒绝”)错误。
我尝试执行基本的蓝图Python lambda函数[示例代码],并且遇到了相同的问题。我的执行职务是lambda_basic_execution
我去了S3>(这里是我的存储桶名称)>权限。
因为我是初学者,所以我使用了Amazon提供的Policy Generator
,而不是自己编写JSON:http://awspolicygen.s3.amazonaws.com/policygen.html我的JSON看起来像这样:{ "Id": "Policy153536723xxxx", "Version": "2012-10-17", "Statement": [ { "Sid": "Stmt153536722xxxx", "Action": [ "s3:GetObject" ], "Effect": "Allow", "Resource": "arn:aws:s3:::tokabucket/*", "Principal": { "AWS": [ "arn:aws:iam::82557712xxxx:role/lambda_basic_execution" ] } } ]
然后代码执行得很好:
我正在尝试从s3读取文件并通过更改读取的文件的内容(Lambda + Node)来创建新文件。从S3读取文件没有任何问题。尝试写入S3存储桶后,我立即收到“访问被拒绝”错误。
如果您在S3存储桶上设置了加密