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AWS Security Token Service
The AWS Security Token Service is a web service that enables you
to request temporary, limited-privilege credentials for AWS
Identity and Access Management (IAM) users or for users that you
authenticate (federated users). This guide provides descriptions
of the AWS Security Token Service API.
For more detailed information about using this service, go to
`Using Temporary Security Credentials`_.
For information about setting up signatures and authorization
through the API, go to `Signing AWS API Requests`_ in the AWS
General Reference . For general information about the Query API,
go to `Making Query Requests`_ in Using IAM . For information
about using security tokens with other AWS products, go to `Using
Temporary Security Credentials to Access AWS`_ in Using Temporary
Security Credentials .
If you're new to AWS and need additional technical information
about a specific AWS product, you can find the product's technical
documentation at `http://aws.amazon.com/documentation/`_.
We will refer to Amazon Identity and Access Management using the
abbreviated form IAM. All copyrights and legal protections still
apply.
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:type anon: boolean
:param anon: If this parameter is True, the ``STSConnection`` object
will make anonymous requests, and it will not use AWS
Credentials or even search for AWS Credentials to make these
requests.
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|� d }|S )N)�secondsz"Cached session token %s is expired) �_session_token_cache�get�datetime�utcnow�boto�utils�parse_ts�
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get_objectr )r r; �mfa_serial_number� mfa_token�paramsr+ r+ r, �_get_session_token s �z STSConnection._get_session_tokenc C sz d| j j| jjf }| �||�}|s|s;tj�d| � z| j� � | �
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Return a valid session token. Because retrieving new tokens
from the Secure Token Service is a fairly heavyweight operation
this module caches previously retrieved tokens and returns
them when appropriate. Each token is cached with a key
consisting of the region name of the STS endpoint
concatenated with the requesting user's access id. If there
is a token in the cache meeting with this key, the session
expiration is checked to make sure it is still valid and if
so, the cached token is returned. Otherwise, a new session
token is requested from STS and it is placed into the cache
and returned.
:type duration: int
:param duration: The number of seconds the credentials should
remain valid.
:type force_new: bool
:param force_new: If this parameter is True, a new session token
will be retrieved from the Secure Token Service regardless
of whether there is a valid cached token or not.
:type mfa_serial_number: str
:param mfa_serial_number: The serial number of an MFA device.
If this is provided and if the mfa_passcode provided is
valid, the temporary session token will be authorized with
to perform operations requiring the MFA device authentication.
:type mfa_token: str
:param mfa_token: The 6 digit token associated with the
MFA device.
z%s:%szfetching a new token for %s)
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Returns a set of temporary security credentials (consisting of
an access key ID, a secret access key, and a security token)
for a federated user. A typical use is in a proxy application
that is getting temporary security credentials on behalf of
distributed applications inside a corporate network. Because
you must call the `GetFederationToken` action using the long-
term security credentials of an IAM user, this call is
appropriate in contexts where those credentials can be safely
stored, usually in a server-based application.
**Note:** Do not use this call in mobile applications or
client-based web applications that directly get temporary
security credentials. For those types of applications, use
`AssumeRoleWithWebIdentity`.
The `GetFederationToken` action must be called by using the
long-term AWS security credentials of the AWS account or an
IAM user. Credentials that are created by IAM users are valid
for the specified duration, between 900 seconds (15 minutes)
and 129600 seconds (36 hours); credentials that are created by
using account credentials have a maximum duration of 3600
seconds (1 hour).
The permissions that are granted to the federated user are the
intersection of the policy that is passed with the
`GetFederationToken` request and policies that are associated
with of the entity making the `GetFederationToken` call.
For more information about how permissions work, see
`Controlling Permissions in Temporary Credentials`_ in Using
Temporary Security Credentials . For information about using
`GetFederationToken` to create temporary security credentials,
see `Creating Temporary Credentials to Enable Access for
Federated Users`_ in Using Temporary Security Credentials .
:type name: string
:param name: The name of the federated user. The name is used as an
identifier for the temporary security credentials (such as `Bob`).
For example, you can reference the federated user name in a
resource-based policy, such as in an Amazon S3 bucket policy.
:type policy: string
:param policy: A policy that specifies the permissions that are granted
to the federated user. By default, federated users have no
permissions; they do not inherit any from the IAM user. When you
specify a policy, the federated user's permissions are intersection
of the specified policy and the IAM user's policy. If you don't
specify a policy, federated users can only access AWS resources
that explicitly allow those federated users in a resource policy,
such as in an Amazon S3 bucket policy.
:type duration: integer
:param duration: The duration, in seconds, that the session
should last. Acceptable durations for federation sessions range
from 900 seconds (15 minutes) to 129600 seconds (36 hours), with
43200 seconds (12 hours) as the default. Sessions for AWS account
owners are restricted to a maximum of 3600 seconds (one hour). If
the duration is longer than one hour, the session for AWS account
owners defaults to one hour.
�NamerC �Policy�GetFederationTokenrG rH )rJ r )r rO r; �policyrM r+ r+ r, �get_federation_token� s ?�z"STSConnection.get_federation_tokenc C sl ||d�}|dur
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Returns a set of temporary security credentials (consisting of
an access key ID, a secret access key, and a security token)
that you can use to access AWS resources that you might not
normally have access to. Typically, you use `AssumeRole` for
cross-account access or federation.
For cross-account access, imagine that you own multiple
accounts and need to access resources in each account. You
could create long-term credentials in each account to access
those resources. However, managing all those credentials and
remembering which one can access which account can be time
consuming. Instead, you can create one set of long-term
credentials in one account and then use temporary security
credentials to access all the other accounts by assuming roles
in those accounts. For more information about roles, see
`Roles`_ in Using IAM .
For federation, you can, for example, grant single sign-on
access to the AWS Management Console. If you already have an
identity and authentication system in your corporate network,
you don't have to recreate user identities in AWS in order to
grant those user identities access to AWS. Instead, after a
user has been authenticated, you call `AssumeRole` (and
specify the role with the appropriate permissions) to get
temporary security credentials for that user. With those
temporary security credentials, you construct a sign-in URL
that users can use to access the console. For more
information, see `Scenarios for Granting Temporary Access`_ in
AWS Security Token Service .
The temporary security credentials are valid for the duration
that you specified when calling `AssumeRole`, which can be
from 900 seconds (15 minutes) to 3600 seconds (1 hour). The
default is 1 hour.
The temporary security credentials that are returned from the
`AssumeRoleWithWebIdentity` response have the permissions that
are associated with the access policy of the role being
assumed and any policies that are associated with the AWS
resource being accessed. You can further restrict the
permissions of the temporary security credentials by passing a
policy in the request. The resulting permissions are an
intersection of the role's access policy and the policy that
you passed. These policies and any applicable resource-based
policies are evaluated when calls to AWS service APIs are made
using the temporary security credentials.
To assume a role, your AWS account must be trusted by the
role. The trust relationship is defined in the role's trust
policy when the IAM role is created. You must also have a
policy that allows you to call `sts:AssumeRole`.
**Important:** You cannot call `Assumerole` by using AWS
account credentials; access will be denied. You must use IAM
user credentials to call `AssumeRole`.
:type role_arn: string
:param role_arn: The Amazon Resource Name (ARN) of the role that the
caller is assuming.
:type role_session_name: string
:param role_session_name: An identifier for the assumed role session.
The session name is included as part of the `AssumedRoleUser`.
:type policy: string
:param policy: A supplemental policy that is associated with the
temporary security credentials from the `AssumeRole` call. The
resulting permissions of the temporary security credentials are an
intersection of this policy and the access policy that is
associated with the role. Use this policy to further restrict the
permissions of the temporary security credentials.
:type duration_seconds: integer
:param duration_seconds: The duration, in seconds, of the role session.
The value can range from 900 seconds (15 minutes) to 3600 seconds
(1 hour). By default, the value is set to 3600 seconds.
:type external_id: string
:param external_id: A unique identifier that is used by third parties
to assume a role in their customers' accounts. For each role that
the third party can assume, they should instruct their customers to
create a role with the external ID that the third party generated.
Each time the third party assumes the role, they must pass the
customer's external ID. The external ID is useful in order to help
third parties bind a role to the customer who created it. For more
information about the external ID, see `About the External ID`_ in
Using Temporary Security Credentials .
:type mfa_serial_number: string
:param mfa_serial_number: The identification number of the MFA device that
is associated with the user who is making the AssumeRole call.
Specify this value if the trust policy of the role being assumed
includes a condition that requires MFA authentication. The value is
either the serial number for a hardware device (such as
GAHT12345678) or an Amazon Resource Name (ARN) for a virtual device
(such as arn:aws:iam::123456789012:mfa/user). Minimum length of 9.
Maximum length of 256.
:type mfa_token: string
:param mfa_token: The value provided by the MFA device, if the trust
policy of the role being assumed requires MFA (that is, if the
policy includes a condition that tests for MFA). If the role being
assumed requires MFA and if the TokenCode value is missing or
expired, the AssumeRole call returns an "access denied" errror.
Minimum length of 6. Maximum length of 6.
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ExternalIdrD rE �
AssumeRolerG rH �rJ r ) r �role_arn�role_session_namerX �duration_seconds� external_idrK rL rM r+ r+ r, � assume_role s q�zSTSConnection.assume_rolec C s> |||d�}|dur||d< |dur||d< | j d|tdd�S )a
Returns a set of temporary security credentials for users who
have been authenticated via a SAML authentication response.
This operation provides a mechanism for tying an enterprise
identity store or directory to role-based AWS access without
user-specific credentials or configuration.
The temporary security credentials returned by this operation
consist of an access key ID, a secret access key, and a
security token. Applications can use these temporary security
credentials to sign calls to AWS services. The credentials are
valid for the duration that you specified when calling
`AssumeRoleWithSAML`, which can be up to 3600 seconds (1 hour)
or until the time specified in the SAML authentication
response's `NotOnOrAfter` value, whichever is shorter.
The maximum duration for a session is 1 hour, and the minimum
duration is 15 minutes, even if values outside this range are
specified.
Optionally, you can pass an AWS IAM access policy to this
operation. The temporary security credentials that are
returned by the operation have the permissions that are
associated with the access policy of the role being assumed,
except for any permissions explicitly denied by the policy you
pass. This gives you a way to further restrict the permissions
for the federated user. These policies and any applicable
resource-based policies are evaluated when calls to AWS are
made using the temporary security credentials.
Before your application can call `AssumeRoleWithSAML`, you
must configure your SAML identity provider (IdP) to issue the
claims required by AWS. Additionally, you must use AWS
Identity and Access Management (AWS IAM) to create a SAML
provider entity in your AWS account that represents your
identity provider, and create an AWS IAM role that specifies
this SAML provider in its trust policy.
Calling `AssumeRoleWithSAML` does not require the use of AWS
security credentials. The identity of the caller is validated
by using keys in the metadata document that is uploaded for
the SAML provider entity for your identity provider.
For more information, see the following resources:
+ `Creating Temporary Security Credentials for SAML
Federation`_ in the Using Temporary Security Credentials
guide.
+ `SAML Providers`_ in the Using IAM guide.
+ `Configuring a Relying Party and Claims in the Using IAM
guide. `_
+ `Creating a Role for SAML-Based Federation`_ in the Using
IAM guide.
:type role_arn: string
:param role_arn: The Amazon Resource Name (ARN) of the role that the
caller is assuming.
:type principal_arn: string
:param principal_arn: The Amazon Resource Name (ARN) of the SAML
provider in AWS IAM that describes the IdP.
:type saml_assertion: string
:param saml_assertion: The base-64 encoded SAML authentication response
provided by the IdP.
For more information, see `Configuring a Relying Party and Adding
Claims`_ in the Using IAM guide.
:type policy: string
:param policy:
An AWS IAM policy in JSON format.
The temporary security credentials that are returned by this operation
have the permissions that are associated with the access policy of
the role being assumed, except for any permissions explicitly
denied by the policy you pass. These policies and any applicable
resource-based policies are evaluated when calls to AWS are made
using the temporary security credentials.
The policy must be 2048 bytes or shorter, and its packed size must be
less than 450 bytes.
:type duration_seconds: integer
:param duration_seconds:
The duration, in seconds, of the role session. The value can range from
900 seconds (15 minutes) to 3600 seconds (1 hour). By default, the
value is set to 3600 seconds. An expiration can also be specified
in the SAML authentication response's `NotOnOrAfter` value. The
actual expiration time is whichever value is shorter.
The maximum duration for a session is 1 hour, and the minimum duration
is 15 minutes, even if values outside this range are specified.
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principal_arn�saml_assertionrX ra rM r+ r+ r, �assume_role_with_saml� s b�
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Returns a set of temporary security credentials for users who
have been authenticated in a mobile or web application with a
web identity provider, such as Login with Amazon, Facebook, or
Google. `AssumeRoleWithWebIdentity` is an API call that does
not require the use of AWS security credentials. Therefore,
you can distribute an application (for example, on mobile
devices) that requests temporary security credentials without
including long-term AWS credentials in the application or by
deploying server-based proxy services that use long-term AWS
credentials. For more information, see `Creating a Mobile
Application with Third-Party Sign-In`_ in AWS Security Token
Service .
The temporary security credentials consist of an access key
ID, a secret access key, and a security token. Applications
can use these temporary security credentials to sign calls to
AWS service APIs. The credentials are valid for the duration
that you specified when calling `AssumeRoleWithWebIdentity`,
which can be from 900 seconds (15 minutes) to 3600 seconds (1
hour). By default, the temporary security credentials are
valid for 1 hour.
The temporary security credentials that are returned from the
`AssumeRoleWithWebIdentity` response have the permissions that
are associated with the access policy of the role being
assumed. You can further restrict the permissions of the
temporary security credentials by passing a policy in the
request. The resulting permissions are an intersection of the
role's access policy and the policy that you passed. These
policies and any applicable resource-based policies are
evaluated when calls to AWS service APIs are made using the
temporary security credentials.
Before your application can call `AssumeRoleWithWebIdentity`,
you must have an identity token from a supported identity
provider and create a role that the application can assume.
The role that your application assumes must trust the identity
provider that is associated with the identity token. In other
words, the identity provider must be specified in the role's
trust policy. For more information, see ` Creating Temporary
Security Credentials for Mobile Apps Using Third-Party
Identity Providers`_.
:type role_arn: string
:param role_arn: The Amazon Resource Name (ARN) of the role that the
caller is assuming.
:type role_session_name: string
:param role_session_name: An identifier for the assumed role session.
Typically, you pass the name or identifier that is associated with
the user who is using your application. That way, the temporary
security credentials that your application will use are associated
with that user. This session name is included as part of the ARN
and assumed role ID in the `AssumedRoleUser` response element.
:type web_identity_token: string
:param web_identity_token: The OAuth 2.0 access token or OpenID Connect
ID token that is provided by the identity provider. Your
application must get this token by authenticating the user who is
using your application with a web identity provider before the
application makes an `AssumeRoleWithWebIdentity` call.
:type provider_id: string
:param provider_id: Specify this value only for OAuth access tokens. Do
not specify this value for OpenID Connect ID tokens, such as
`accounts.google.com`. This is the fully-qualified host component
of the domain name of the identity provider. Do not include URL
schemes and port numbers. Currently, `www.amazon.com` and
`graph.facebook.com` are supported.
:type policy: string
:param policy: A supplemental policy that is associated with the
temporary security credentials from the `AssumeRoleWithWebIdentity`
call. The resulting permissions of the temporary security
credentials are an intersection of this policy and the access
policy that is associated with the role. Use this policy to further
restrict the permissions of the temporary security credentials.
:type duration_seconds: integer
:param duration_seconds: The duration, in seconds, of the role session.
The value can range from 900 seconds (15 minutes) to 3600 seconds
(1 hour). By default, the value is set to 3600 seconds.
)rZ r[ �WebIdentityTokenN�
ProviderIdrV rC �AssumeRoleWithWebIdentityrG rH r^ )r r_ r` �web_identity_token� provider_idrX ra rM r+ r+ r, � assume_role_with_web_identity� s Y��z+STSConnection.assume_role_with_web_identityc C s d|i}| j d|tdd�S )a
Decodes additional information about the authorization status
of a request from an encoded message returned in response to
an AWS request.
For example, if a user is not authorized to perform an action
that he or she has requested, the request returns a
`Client.UnauthorizedOperation` response (an HTTP 403
response). Some AWS actions additionally return an encoded
message that can provide details about this authorization
failure.
Only certain AWS actions return an encoded authorization
message. The documentation for an individual action indicates
whether that action returns an encoded message in addition to
returning an HTTP code.
The message is encoded because the details of the
authorization status can constitute privileged information
that the user who requested the action should not see. To
decode an authorization status message, a user must be granted
permissions via an IAM policy to request the
`DecodeAuthorizationMessage` (
`sts:DecodeAuthorizationMessage`) action.
The decoded message includes the following type of
information:
+ Whether the request was denied due to an explicit deny or
due to the absence of an explicit allow. For more information,
see `Determining Whether a Request is Allowed or Denied`_ in
Using IAM .
+ The principal who made the request.
+ The requested action.
+ The requested resource.
+ The values of condition keys in the context of the user's
request.
:type encoded_message: string
:param encoded_message: The encoded message that was returned with the
response.
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