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import datetime
import re
from base64 import b64decode
from typing import Any, Optional
import xmltodict
from moto.core.base_backend import BackendDict, BaseBackend
from moto.core.common_models import BaseModel
from moto.core.utils import utcnow
from moto.iam.models import AccessKey, iam_backends
from moto.sts.utils import (
DEFAULT_STS_SESSION_DURATION,
random_assumed_role_id,
random_session_token,
)
from moto.utilities.utils import ARN_PARTITION_REGEX, PARTITION_NAMES, get_partition
class Token(BaseModel):
def __init__(self, duration: int, name: Optional[str] = None):
now = utcnow()
self.expiration = now + datetime.timedelta(seconds=duration)
self.name = name
self.policy = None
class AssumedRole(BaseModel):
def __init__(
self,
account_id: str,
region_name: str,
access_key: AccessKey,
role_session_name: str,
role_arn: str,
policy: str,
duration: int,
external_id: str,
):
self.account_id = account_id
self.region_name = region_name
self.session_name = role_session_name
self.role_arn = role_arn
self.policy = policy
now = utcnow()
self.expiration = now + datetime.timedelta(seconds=duration)
self.external_id = external_id
self.access_key = access_key
self.access_key_id = access_key.access_key_id
self.secret_access_key = access_key.secret_access_key
self.session_token = random_session_token()
self.partition = get_partition(region_name)
@property
def user_id(self) -> str:
iam_backend = iam_backends[self.account_id][self.partition]
try:
role_id = iam_backend.get_role_by_arn(arn=self.role_arn).id
except Exception:
role_id = "AROA" + random_assumed_role_id()
return role_id + ":" + self.session_name
@property
def arn(self) -> str:
partition = get_partition(self.region_name)
return f"arn:{partition}:sts::{self.account_id}:assumed-role/{self.role_arn.split('/')[-1]}/{self.session_name}"
class STSBackend(BaseBackend):
def __init__(self, region_name: str, account_id: str):
super().__init__(region_name, account_id)
self.assumed_roles: list[AssumedRole] = []
def get_session_token(self, duration: int) -> Token:
return Token(duration=duration)
def get_federation_token(self, name: Optional[str], duration: int) -> Token:
return Token(duration=duration, name=name)
def assume_role(
self,
region_name: str,
role_session_name: str,
role_arn: str,
policy: str,
duration: int,
external_id: str,
) -> AssumedRole:
"""
Assume an IAM Role. Note that the role does not need to exist. The ARN can point to another account, providing an opportunity to switch accounts.
"""
account_id, access_key = self._create_access_key(role=role_arn)
role = AssumedRole(
account_id=account_id,
region_name=region_name,
access_key=access_key,
role_session_name=role_session_name,
role_arn=role_arn,
policy=policy,
duration=duration,
external_id=external_id,
)
access_key.role_arn = role_arn
account_backend = sts_backends[account_id][get_partition(region_name)]
account_backend.assumed_roles.append(role)
return role
def get_assumed_role_from_access_key(
self, access_key_id: str
) -> Optional[AssumedRole]:
for assumed_role in self.assumed_roles:
if assumed_role.access_key_id == access_key_id:
return assumed_role
return None
def assume_role_with_web_identity(self, **kwargs: Any) -> AssumedRole:
return self.assume_role(**kwargs)
def assume_role_with_saml(self, **kwargs: Any) -> AssumedRole:
del kwargs["principal_arn"]
saml_assertion_encoded = kwargs.pop("saml_assertion")
saml_assertion_decoded = b64decode(saml_assertion_encoded)
namespaces = {
"urn:oasis:names:tc:SAML:2.0:protocol": "samlp",
"urn:oasis:names:tc:SAML:2.0:assertion": "saml",
}
saml_assertion = xmltodict.parse(
saml_assertion_decoded.decode("utf-8"),
force_cdata=True,
process_namespaces=True,
namespaces=namespaces,
namespace_separator="|",
)
target_role = None
saml_assertion_attributes = saml_assertion["samlp|Response"]["saml|Assertion"][
"saml|AttributeStatement"
]["saml|Attribute"]
for attribute in saml_assertion_attributes:
if (
attribute["@Name"]
== "https://aws.amazon.com/SAML/Attributes/RoleSessionName"
):
kwargs["role_session_name"] = attribute["saml|AttributeValue"]["#text"]
if (
attribute["@Name"]
== "https://aws.amazon.com/SAML/Attributes/SessionDuration"
):
kwargs["duration"] = int(attribute["saml|AttributeValue"]["#text"])
if attribute["@Name"] == "https://aws.amazon.com/SAML/Attributes/Role":
target_role = attribute["saml|AttributeValue"]["#text"].split(",")[0]
if "duration" not in kwargs:
kwargs["duration"] = DEFAULT_STS_SESSION_DURATION
account_id, access_key = self._create_access_key(role=target_role) # type: ignore
kwargs["account_id"] = account_id
kwargs["region_name"] = self.region_name
kwargs["access_key"] = access_key
kwargs["external_id"] = None
kwargs["policy"] = None
role = AssumedRole(**kwargs)
self.assumed_roles.append(role)
return role
def get_caller_identity(
self, access_key_id: str, region: str
) -> tuple[str, str, str]:
assumed_role = self.get_assumed_role_from_access_key(access_key_id)
if assumed_role:
return assumed_role.user_id, assumed_role.arn, assumed_role.account_id
iam_backend = iam_backends[self.account_id][self.partition]
user = iam_backend.get_user_from_access_key_id(access_key_id)
if user:
return user.id, user.arn, user.account_id
# Default values in case the request does not use valid credentials generated by moto
partition = get_partition(region)
user_id = "AKIAIOSFODNN7EXAMPLE"
arn = f"arn:{partition}:sts::{self.account_id}:user/moto"
return user_id, arn, self.account_id
def _create_access_key(self, role: str) -> tuple[str, AccessKey]:
account_id_match = re.search(ARN_PARTITION_REGEX + r":iam::([0-9]+).+", role)
if account_id_match:
account_id = account_id_match.group(2)
else:
account_id = self.account_id
iam_backend = iam_backends[account_id][self.partition]
return account_id, iam_backend.create_temp_access_key()
sts_backends = BackendDict(
STSBackend, "sts", use_boto3_regions=False, additional_regions=PARTITION_NAMES
)
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