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Add support for AWS assume_role with a session token #13919

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Merged
merged 1 commit into from
Aug 25, 2025
Merged

Add support for AWS assume_role with a session token #13919

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3 changes: 3 additions & 0 deletions litellm/llms/bedrock/base_aws_llm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,7 @@ def get_credentials(
credentials, _cache_ttl = self._auth_with_aws_role(
aws_access_key_id=aws_access_key_id,
aws_secret_access_key=aws_secret_access_key,
aws_session_token=aws_session_token,
aws_role_name=aws_role_name,
aws_session_name=aws_session_name,
)
Expand Down Expand Up @@ -554,6 +555,7 @@ def _auth_with_aws_role(
self,
aws_access_key_id: Optional[str],
aws_secret_access_key: Optional[str],
aws_session_token: Optional[str],
aws_role_name: str,
aws_session_name: str,
) -> Tuple[Credentials, Optional[int]]:
Expand Down Expand Up @@ -614,6 +616,7 @@ def _auth_with_aws_role(
"sts",
aws_access_key_id=aws_access_key_id,
aws_secret_access_key=aws_secret_access_key,
aws_session_token=aws_session_token,
)

sts_response = sts_client.assume_role(
Expand Down
1 change: 1 addition & 0 deletions tests/llm_translation/test_aws_base_llm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,7 @@ def test_auth_with_aws_role(mock_boto3_client, base_aws_llm):
credentials, ttl = base_aws_llm._auth_with_aws_role(
aws_access_key_id="test_access",
aws_secret_access_key="test_secret",
aws_session_token="test_token",
aws_role_name="test_role",
aws_session_name="test_session",
)
Expand Down
14 changes: 13 additions & 1 deletion tests/test_litellm/llms/bedrock/test_base_aws_llm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -576,6 +576,7 @@ def test_eks_irsa_ambient_credentials_used():
credentials, ttl = base_aws_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::2222222222222:role/LitellmEvalBedrockRole",
aws_session_name="test-session"
)
Expand Down Expand Up @@ -630,6 +631,7 @@ def test_explicit_credentials_used_when_provided():
credentials, ttl = base_aws_llm._auth_with_aws_role(
aws_access_key_id="explicit-access-key",
aws_secret_access_key="explicit-secret-key",
aws_session_token="assumed-session-token",
aws_role_name="arn:aws:iam::2222222222222:role/LitellmEvalBedrockRole",
aws_session_name="test-session"
)
Expand All @@ -639,6 +641,7 @@ def test_explicit_credentials_used_when_provided():
"sts",
aws_access_key_id="explicit-access-key",
aws_secret_access_key="explicit-secret-key",
aws_session_token="assumed-session-token",
)

# Should call assume_role
Expand Down Expand Up @@ -687,6 +690,7 @@ def test_partial_credentials_still_use_ambient():
credentials, ttl = base_aws_llm._auth_with_aws_role(
aws_access_key_id="AKIAEXAMPLE",
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::2222222222222:role/LitellmEvalBedrockRole",
aws_session_name="test-session"
)
Expand All @@ -695,7 +699,8 @@ def test_partial_credentials_still_use_ambient():
mock_boto3_client.assert_called_once_with(
"sts",
aws_access_key_id="AKIAEXAMPLE",
aws_secret_access_key=None
aws_secret_access_key=None,
aws_session_token=None,
)

# Should still call assume_role
Expand Down Expand Up @@ -737,6 +742,7 @@ def test_cross_account_role_assumption():
credentials, ttl = base_aws_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::999999999999:role/CrossAccountRole",
aws_session_name="cross-account-session"
)
Expand Down Expand Up @@ -789,6 +795,7 @@ def test_role_assumption_with_custom_session_name():
credentials, ttl = base_aws_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::1111111111111:role/LitellmRole",
aws_session_name="evals-bedrock-session"
)
Expand Down Expand Up @@ -832,6 +839,7 @@ def test_role_assumption_ttl_calculation():
credentials, ttl = base_aws_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::1111111111111:role/LitellmRole",
aws_session_name="ttl-test-session"
)
Expand All @@ -858,6 +866,7 @@ def test_role_assumption_error_handling():
base_aws_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::1111111111111:role/UnauthorizedRole",
aws_session_name="error-test-session"
)
Expand Down Expand Up @@ -911,6 +920,7 @@ def test_multiple_role_assumptions_in_sequence():
credentials1, ttl1 = base_aws_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::1111111111111:role/LitellmRole",
aws_session_name="session-1"
)
Expand All @@ -919,6 +929,7 @@ def test_multiple_role_assumptions_in_sequence():
credentials2, ttl2 = base_aws_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name="arn:aws:iam::2222222222222:role/LitellmEvalBedrockRole",
aws_session_name="session-2"
)
Expand Down Expand Up @@ -980,6 +991,7 @@ def test_auth_with_aws_role_irsa_environment():
creds, ttl = base_llm._auth_with_aws_role(
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
aws_role_name='arn:aws:iam::222222222222:role/target-role',
aws_session_name='test-session'
)
Expand Down
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