Obtains a temporary identity for assuming a role.

Request parameters

Parameter Type Required? Example value Description
Action String Yes AssumeRole

The name of this action.

Value: AssumeRole

RoleArn String Yes acs:ram::123456789012****:role/adminrole

The Alibaba Cloud Resource Name (ARN) of a RAM role.

Pattern: acs:ram::$accountID:role/$roleName

RoleSessionName String Yes alice

The role session name. This parameter can be customized to identify the user who assumes a role.

Pattern: ^[a-zA-Z0-9\.@\-_]+$

Note This parameter must be 2 to 32 characters in length.
Policy String No {"Statement": [{"Action": ["*"],"Effect": "Allow","Resource": ["*"]}],"Version":"1"}

The policy. It must be 1 to 1024 bytes in length.

This parameter can be used to specify the permission of an STS token. If this parameter is left unspecified, the returned STS token has all permissions of a specific role.

DurationSeconds Integer No 3,600

The expiration duration.

Unit: second

Value range: 900 to 3,600

Default value: 3,600

Response parameters

Parameter Type Example value Description
RequestId String 6894B13B-6D71-4EF5-88FA-F32781734A7F The request ID.
Credentials N/A N/A The access credential.
AccessKeyId String STS.L4aBSCSJVMuKg5U1**** The access key ID.
AccessKeySecret String wyLTSmsyPGP1ohvvw8xYgB29dlGI8KMiH2pK**** The access key secret.
SecurityToken String ******** The security token.
Expiration String 2015-04-09T11:52:19Z The date and time when the identity expires.
AssumedRoleUser N/A N/A The temporary identity for assuming a role.
Arn String acs:sts::123456789012****:assumed-role/AdminRole/alice

The ARN of a specific role.

Pattern: acs:ram::$accountID:role/$roleName

AssumedRoleUserId String 34458433936495****:alice The ID of the temporary identity for assuming a role.


Request example

&<Common parameters>

Response example

XML format


JSON format

    "Credentials": {
        "AccessKeyId": "STS.L4aBSCSJVMuKg5U1****",
        "AccessKeySecret": "wyLTSmsyPGP1ohvvw8xYgB29dlGI8KMiH2pK****",
        "Expiration": "2015-04-09T11:52:19Z",
        "SecurityToken": "********"
    "AssumedRoleUser": {
        "arn": "acs:sts::123456789012****:assumed-role/AdminRole/alice",
    "RequestId": "6894B13B-6D71-4EF5-88FA-F32781734A7F"


Error code Error message HTTP status code Meaning
InvalidParameter The parameter RoleArn is wrongly formed. 400 The ARN format of the role is incorrect.
InvalidParameter.RoleArn The parameter RoleArn is wrongly formed. 400 The ARN format of the role is incorrect.
InvalidParameter.RoleSessionName The parameter RoleSessionName is wrongly formed. 400

The value of the RoleSessionName parameter is incorrect. This parameter must be 2 to 32 characters in length.

The allowed pattern is ^[a-zA-Z0-9\.@\-_]+$.

InvalidParameter.DurationSeconds The Min/Max value of DurationSeconds is 15min/1hr. 400 The value of the DurationSeconds parameter is incorrect. The value ranges from 900 to 3,600, in seconds.
InvalidParameter.PolicyGrammar The parameter Policy has not passed grammar check. 400 The policy grammar is incorrect.
InvalidParameter.PolicySize The size of Policy must be smaller than 1024 bytes. 400 The policy cannot exceed 1024 bytes.
NoPermission You are not authorized to do this action. You should be authorized by RAM. 403 The STS token does not have the required permission.
InternalError STS Server Internal Error happened. 500 An internal server error occurs.