tencent cloud

Security Token Service

AssumeRole

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Last updated: 2026-04-24 15:38:32

1. API Description

Domain name for API request: sts.intl.tencentcloudapi.com.

This API is used to request temporary access credentials for assuming a role.

This API is used to describe the composition of role policies.

This API is used to specify the role trust policy, which defines who can assume the role.

This API is used to specify the role permission policy, which defines what actions can be performed after assuming the role.

This API is used to describe the conditions under which a role can be assumed.

This API is used to bind a policy that allows a user to call AssumeRole.

This API is used to add a user as a principal in the role trust policy.

A maximum of 600 requests can be initiated per second for this API.

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2. Input Parameters

The following request parameter list only provides API request parameters and some common parameters. For the complete common parameter list, see Common Request Parameters.

Parameter Name Required Type Description
Action Yes String Common Params. The value used for this API: AssumeRole.
Version Yes String Common Params. The value used for this API: 2018-08-13.
Region Yes String Common Params. For more information, please see the list of regions supported by the product.
RoleArn Yes String Resource descriptions of a role, which can be obtained by clicking the role name in the CAM console.
General role:
qcs::cam::uin/12345678:role/4611686018427397919, qcs::cam::uin/12345678:roleName/testRoleName
Service role:
qcs::cam::uin/12345678:role/tencentcloudServiceRole/4611686018427397920, qcs::cam::uin/12345678:role/tencentcloudServiceRoleName/testServiceRoleName
RoleSessionName Yes String User-defined temporary session name.
It can contain 2-128 letters, digits, and symbols (=,.@_-). Regex: [\w+=,.@_-]*
DurationSeconds No Integer Specifies the validity period of the temporary access credentials in seconds. Default value: 7,200s. Maximum value: 43,200s.
Policy No String Policy description

Note:

This parameter needs to be URL-encoded. The server will URL-decode this field and grant temporary access credentials based on the processed policy. Please pass the parameter according to the specification. (If you request a TencentCloud API through the GET method, all parameters must be URL-encoded again in accordance with Signature v3 before the request is sent).
The policy syntax refers to CAM's Syntax Logic.
3. The policy cannot contain the principal element.
ExternalId No String External role ID, which can be obtained by clicking the role name in the CAM console.
It can contain 2-128 letters, digits, and symbols (=,.@:/-). Regex: [\w+=,.@:/-]*
Tags.N No Array of Tag List of session tags. Up to 50 tags are allowed. The tag keys can not duplicate.
SourceIdentity No String UIN of the initiator
SerialNumber No String
TokenCode No String

3. Output Parameters

Parameter Name Type Description
Credentials Credentials Temporary access credentials
ExpiredTime Integer Expiration time of the temporary access credentials. A Unix timestamp will be returned which is accurate to the second.
Expiration String Expiration time of the temporary access credentials in UTC time in ISO 8601 format.
RequestId String The unique request ID, generated by the server, will be returned for every request (if the request fails to reach the server for other reasons, the request will not obtain a RequestId). RequestId is required for locating a problem.

4. Example

Example1 Applying for Temporary Credentials for a Role

This example shows you how to apply for temporary credentials for a role.

Input Example

POST / HTTP/1.1
Host: sts.intl.tencentcloudapi.com
Content-Type: application/json
X-TC-Action: AssumeRole
<Common request parameters>

{
    "RoleArn": "qcs::cam::uin/100015158414:roleName/readOnlyRole",
    "RoleSessionName": "cts"
}

Output Example

{
    "Response": {
        "Credentials": {
            "Token": "da1e***",
            "TmpSecretId": "AKID***",
            "TmpSecretKey": "q95K***"
        },
        "ExpiredTime": 1543914376,
        "Expiration": "2018-12-04T09:06:16Z",
        "RequestId": "4daec797-9cd2-4f09-9e7a-7d4c43b2a74c"
    }
}

5. Developer Resources

SDK

TencentCloud API 3.0 integrates SDKs that support various programming languages to make it easier for you to call APIs.

Command Line Interface

6. Error Code

The following only lists the error codes related to the API business logic. For other error codes, see Common Error Codes.

Error Code Description
FailedOperation.CheckMFAError
FailedOperation.MFATypeNotSupported
InternalError.DbError Database error.
InternalError.EncryptError Encryption failed.
InternalError.GetAppIdError Failed to get the appid.
InternalError.GetRoleError Failed to get the role.
InternalError.GetSeedTokenError Failed to obtain the token.
InternalError.IllegalRole Invalid role.
InternalError.PbSerializeError pb packaging failed.
InternalError.SystemError Internal system error, such as network error.
InternalError.UnknownError Unknown error.
InvalidParameter.AccountNotAvaliable The account does not exist or is unavailable.
InvalidParameter.ExtendStrategyOverSize The extension policy is too large.
InvalidParameter.GrantOtherResource Unauthorized access to the resource.
InvalidParameter.OverLimit Frequency limit exceeded.
InvalidParameter.OverTimeError The expiration time exceeds the threshold.
InvalidParameter.ParamError Invalid parameter.
InvalidParameter.PolicyTooLong The policy is too long.
InvalidParameter.ResouceError Six-segment resource description error.
InvalidParameter.StrategyFormatError Policy syntax error.
InvalidParameter.StrategyInvalid Invalid policy.
InvalidParameter.TempCodeNotAvaliable Invalid temporary code.
ResourceNotFound.RoleNotFound The role corresponding to the account does not exist.
UnauthorizedOperation Unauthorized operation.
UnsupportedOperation Unsupported operation.

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