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Showing content from https://docs.aws.amazon.com/IAM/latest/APIReference/API_UpdateAssumeRolePolicy.html below:

AWS Identity and Access Management

UpdateAssumeRolePolicy

Updates the policy that grants an IAM entity permission to assume a role. This is typically referred to as the "role trust policy". For more information about roles, see Using roles to delegate permissions and federate identities.

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

PolicyDocument

The policy that grants an entity permission to assume the role.

You must provide policies in JSON format in IAM. However, for AWS CloudFormation templates formatted in YAML, you can provide the policy in JSON or YAML format. AWS CloudFormation always converts a YAML policy to JSON format before submitting it to IAM.

The regex pattern used to validate this parameter is a string of characters consisting of the following:

Any printable ASCII character ranging from the space character (\u0020) through the end of the ASCII character range
The printable characters in the Basic Latin and Latin-1 Supplement character set (through \u00FF)
The special characters tab (\u0009), line feed (\u000A), and carriage return (\u000D)

Type: String

Length Constraints: Minimum length of 1. Maximum length of 131072.

Pattern: [\u0009\u000A\u000D\u0020-\u00FF]+

Required: Yes

RoleName

The name of the role to update with the new policy.

This parameter allows (through its regex pattern) a string of characters consisting of upper and lowercase alphanumeric characters with no spaces. You can also include any of the following characters: _+=,.@-

Type: String

Length Constraints: Minimum length of 1. Maximum length of 64.

Pattern: [\w+=,.@-]+

Required: Yes

Errors

For information about the errors that are common to all actions, see Common Errors.

LimitExceeded

The request was rejected because it attempted to create resources beyond the current AWS account limits. The error message describes the limit exceeded.

HTTP Status Code: 409

MalformedPolicyDocument

The request was rejected because the policy document was malformed. The error message describes the specific error.

HTTP Status Code: 400

NoSuchEntity

The request was rejected because it referenced a resource entity that does not exist. The error message describes the resource.

HTTP Status Code: 404

ServiceFailure

The request processing has failed because of an unknown error, exception or failure.

HTTP Status Code: 500

UnmodifiableEntity

The request was rejected because service-linked roles are protected AWS resources. Only the service that depends on the service-linked role can modify or delete the role on your behalf. The error message includes the name of the service that depends on this service-linked role. You must request the change through that service.

HTTP Status Code: 400

Examples Example

This example illustrates one usage of UpdateAssumeRolePolicy.

Sample Request

https://iam.amazonaws.com/?Action=UpdateAssumeRolePolicy
&PolicyDocument={"Version":"2012-10-17","Statement":[{"Effect":"Allow",
"Principal":{"Service":["ec2.amazonaws.com"]},"Action":["sts:AssumeRole"]}]}
&RoleName=S3AccessForEC2Instances
&Version=2010-05-08
&AUTHPARAMS

Sample Response

<UpdateAssumeRolePolicyResponse xmlns="https://iam.amazonaws.com/doc/2010-05-08/">
<ResponseMetadata>
  <RequestId>309c1671-99ed-11e1-a4c3-270EXAMPLE04</RequestId>
</ResponseMetadata>
</UpdateAssumeRolePolicyResponse>