【发布时间】：2017-06-14 23:38:55
【问题描述】：
我有一个 Cognito 用户池，用于从应用注册/登录我的用户，然后使用 Cognito Identity 提供身份验证。我已禁用未经身份验证的用户。 一旦用户注册，用户就会在池中创建。当他登录时，身份在身份池中创建，我可以看到这个身份链接到用户池（链接登录）。但是，当用户尝试访问 AWS 资源（Dynamo、Lambda 函数等）时，调用会返回“此身份池不支持未经身份验证的访问”。但是，我能够获取用户详细信息和在身份池中创建的身份 ID。
这是我使用的代码：
func cognitoUserPoolInit(window:UIWindow, debugLogFiles: DebugLogFiles) {
self.window = window
//Configure Cognito Identity User Pool. Edit ConstantAWS to change pool
let serviceConfiguration = AWSServiceConfiguration(region: K.COGNITO_REGIONTYPE, credentialsProvider: nil)
let userPoolConfiguration = AWSCognitoIdentityUserPoolConfiguration(clientId: K.COGNITO_USER_POOL_APP_CLIENT_ID, clientSecret: K.COGNITO_USER_POOL_APP_CLIENT_SECRET, poolId: K.COGNITO_USER_POOL_ID)
AWSCognitoIdentityUserPool.registerCognitoIdentityUserPoolWithConfiguration(serviceConfiguration, userPoolConfiguration: userPoolConfiguration, forKey: "UserPool")
self.pool = AWSCognitoIdentityUserPool(forKey: "UserPool")
self.pool!.delegate = self
self.cognitoIdentityUser = self.pool!.currentUser()
}
func getCognitoUserPoolUserId() {
self.cognitoIdentityUser!.getDetails().continueWithBlock() { (task) in
dispatch_async(dispatch_get_main_queue()) {
self.needtoGetCognitoUserId = false
if task.error != nil { // some sort of error
let alert = UIAlertController(title: "", message: task.error?.userInfo["message"] as? String, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
NSLog("Domain: " + (task.error?.domain)! + " Code: \(task.error?.code)")
if task.error?.code == NSURLErrorNotConnectedToInternet {
self.lastError = (task.error?.code)!
//no internet connection. Fire a timer to get our credential as soon as network is back
let internetOfflineTimer:NSTimer = NSTimer.scheduledTimerWithTimeInterval(10.0, target: self, selector: #selector(UserPool.internetOffline), userInfo: nil, repeats: false)
dispatch_async(dispatch_get_main_queue(), {() -> Void in
NSRunLoop.mainRunLoop().addTimer(internetOfflineTimer, forMode: NSDefaultRunLoopMode)
})
} else {
if task.error?.userInfo["message"] != nil {
NSLog(task.error?.userInfo["message"] as! String)
}
}
} else {
// I got no error
// i got the username earlier - use it
self.lastError = 0
if let response: AWSCognitoIdentityUserGetDetailsResponse = task.result as? AWSCognitoIdentityUserGetDetailsResponse {
var sub: String?
for attribute in response.userAttributes! {
if attribute.name == "sub" {
sub = attribute.value
NSLog("sub:" + sub!)
break;
}
}
//if the user Id, then go ahead and get the dynamoDB table
if sub != nil {
self.cognitoUserPoolUserId = sub
self.getCognitoIdentity()
} else {
NSLog("UserId not found in response")
}
}
}
}
return nil
}
}
func getCognitoIdentity() -> Bool {
// Initialize the Amazon Cognito credentials provider
//get pool id from plist (Federated Identieis pool not User pool)
var myDict: NSDictionary?
var identityPoolID: String?
var region: String?
//PoolId points to TestIDPool in the Federated Identitied/West region for test purpose
if let path = NSBundle.mainBundle().pathForResource("Info", ofType: "plist") {
myDict = NSDictionary(contentsOfFile: path)
identityPoolID = myDict!.objectForKey("AWS")!.objectForKey("CredentialsProvider")!.objectForKey("CognitoIdentity")!.objectForKey("Default")!.objectForKey("PoolId")! as? String;
region = myDict!.objectForKey("AWS")!.objectForKey("CredentialsProvider")!.objectForKey("CognitoIdentity")!.objectForKey("Default")!.objectForKey("Region") as? String;
} else {
return false
}
self.credentialsProvider = AWSCognitoCredentialsProvider(regionType: region!.aws_regionTypeValue(), identityPoolId: identityPoolID!, identityProviderManager:self.pool)
AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = AWSServiceConfiguration(region: .USWest2, credentialsProvider: self.credentialsProvider)
transferManager = AWSS3TransferManager.defaultS3TransferManager()
// Retrieve your Amazon Cognito ID
self.credentialsProvider!.getIdentityId().continueWithBlock { (task: AWSTask!) -> AnyObject! in
if (task.error != nil) {
print("Error: " + task.error!.localizedDescription)
}
else {
// the task result will contain the identity id
print("cognitoId: " + self.credentialsProvider!.identityId!)
//At this point we get the identity to query the database
self.queryLatestItem()
}
return nil
}
return true
}
func queryLatestItem() {
let dynamoDBObjectMapper = AWSDynamoDBObjectMapper.defaultDynamoDBObjectMapper()
let queryExpression = AWSDynamoDBQueryExpression()
queryExpression.scanIndexForward = false
queryExpression.limit = 1
queryExpression.keyConditionExpression = "userId = :UID"
queryExpression.expressionAttributeValues = [":UID" : (self.cognitoUserPoolUserId)!]
dynamoDBObjectMapper .query(StatisticsDB.self, expression: queryExpression) .continueWithExecutor(AWSExecutor.mainThreadExecutor(), withBlock: { (task:AWSTask!) -> AnyObject! in
if (task.error != nil) {
print("Error: \(task.error)") --> this is where i get the unauthenticated error.....
...
当用户访问需要 DynamoDB 数据的 UI 时，从 appDelegate 和 getCognitoUserPoolUserId() 调用cognitoUserPoolInit()。
如果我在联合池中选择“启用对未经身份验证的身份的访问”，它就可以正常工作。
另外，我有一个 Web 应用程序，可以登录、正确验证并毫无问题地访问 AWS 服务。我也是如此，我的 AWS/角色配置应该很好，并且可能在应用程序端发生了问题。
我不明白如何获取用户详细信息和正确的身份 ID（来自 print("cognitoId: " + self.credentialsProvider!.identityId!)）并收到未经身份验证的错误。
重新启动应用程序会出现稍微不同的错误：
{
Connection = "keep-alive";
"Content-Length" = 129;
"Content-Type" = "application/x-amz-json-1.1";
Date = "Sun, 29 Jan 2017 20:04:06 GMT";
"x-amzn-ErrorMessage" = "Access to Identity 'us-west-2:714eccXXXa5-42d8-8b29-5e2XXXXXXX' is forbidden.";
"x-amzn-ErrorType" = "NotAuthorizedException:";
"x-amzn-RequestId" = "16fc81c2-e65e-11e6-9643-756bf858abb7";
}
为我使用的身份验证添加了角色权限：
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"mobileanalytics:PutEvents",
"cognito-sync:*",
"cognito-identity:*",
"dynamodb:*",
"lambda:*",
"s3:*"
],
"Resource": [
"*"
]
}
]
}
和信任关系
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "",
"Effect": "Allow",
"Principal": {
"Federated": "cognito-identity.amazonaws.com"
},
"Action": "sts:AssumeRoleWithWebIdentity",
"Condition": {
"StringEquals": {
"cognito-identity.amazonaws.com:aud": "us-west-2:7cXXXX5f-b91e-4fc9-a72c-6f91XXXXXXX"
},
"ForAnyValue:StringLike": {
"cognito-identity.amazonaws.com:amr": "authenticated"
}
}
}
]
}
【问题讨论】：
-
您在尝试查询 DynamoDB 表时似乎遇到了此错误。我的第一直觉是您在 AWS IAM 设置中没有您的 auth_user 角色来允许查询。
-
我应该扩展我想说的 - 我认为您的特定 DynamoDB 表的 IAM 角色不允许查询 auth_user。你能验证一下并告诉我吗？
-
我添加了用于身份池的 Auth_role 的权限和信任关系。目前，由于我对所需的所有 AWS 服务都使用了通配符，因此应该包含 DynamoDB 查询。
标签： ios amazon-web-services amazon-cognito federated-identity