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# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
from datetime import datetime
import json
import re
from azure.identity import AzureCliCredential, CredentialUnavailableError
from azure.identity._constants import EnvironmentVariables
from azure.identity._credentials.azure_cli import CLI_NOT_FOUND, NOT_LOGGED_IN
from azure.core.exceptions import ClientAuthenticationError
import subprocess
import pytest
from helpers import mock
CHECK_OUTPUT = AzureCliCredential.__module__ + ".subprocess.check_output"
TEST_ERROR_OUTPUTS = (
'{"accessToken": "secret value',
'{"accessToken": "secret value"',
'{"accessToken": "secret value and some other nonsense"',
'{"accessToken": "secret value", some invalid json, "accessToken": "secret value"}',
'{"accessToken": "secret value"}',
'{"accessToken": "secret value", "subscription": "some-guid", "tenant": "some-guid", "tokenType": "Bearer"}',
"no secrets or json here",
"{}",
)
def raise_called_process_error(return_code, output="", cmd="...", stderr=""):
error = subprocess.CalledProcessError(return_code, cmd=cmd, output=output, stderr=stderr)
return mock.Mock(side_effect=error)
def test_no_scopes():
"""The credential should raise ValueError when get_token is called with no scopes"""
with pytest.raises(ValueError):
AzureCliCredential().get_token()
def test_multiple_scopes():
"""The credential should raise ValueError when get_token is called with more than one scope"""
with pytest.raises(ValueError):
AzureCliCredential().get_token("one scope", "and another")
def test_get_token():
"""The credential should parse the CLI's output to an AccessToken"""
access_token = "access token"
expected_expires_on = 1602015811
successful_output = json.dumps(
{
"expiresOn": datetime.fromtimestamp(expected_expires_on).strftime("%Y-%m-%d %H:%M:%S.%f"),
"accessToken": access_token,
"subscription": "some-guid",
"tenant": "some-guid",
"tokenType": "Bearer",
}
)
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, mock.Mock(return_value=successful_output)):
token = AzureCliCredential().get_token("scope")
assert token.token == access_token
assert type(token.expires_on) == int
assert token.expires_on == expected_expires_on
def test_cli_not_installed():
"""The credential should raise CredentialUnavailableError when the CLI isn't installed"""
with mock.patch("shutil.which", return_value=None):
with pytest.raises(CredentialUnavailableError, match=CLI_NOT_FOUND):
AzureCliCredential().get_token("scope")
def test_cannot_execute_shell():
"""The credential should raise CredentialUnavailableError when the subprocess doesn't start"""
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, mock.Mock(side_effect=OSError())):
with pytest.raises(CredentialUnavailableError):
AzureCliCredential().get_token("scope")
def test_not_logged_in():
"""When the CLI isn't logged in, the credential should raise CredentialUnavailableError"""
stderr = "ERROR: Please run 'az login' to setup account."
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, raise_called_process_error(1, stderr=stderr)):
with pytest.raises(CredentialUnavailableError, match=NOT_LOGGED_IN):
AzureCliCredential().get_token("scope")
def test_unexpected_error():
"""When the CLI returns an unexpected error, the credential should raise an error containing the CLI's output"""
stderr = "something went wrong"
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, raise_called_process_error(42, stderr=stderr)):
with pytest.raises(ClientAuthenticationError, match=stderr):
AzureCliCredential().get_token("scope")
@pytest.mark.parametrize("output", TEST_ERROR_OUTPUTS)
def test_parsing_error_does_not_expose_token(output):
"""Errors during CLI output parsing shouldn't expose access tokens in that output"""
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, mock.Mock(return_value=output)):
with pytest.raises(ClientAuthenticationError) as ex:
AzureCliCredential().get_token("scope")
assert "secret value" not in str(ex.value)
assert "secret value" not in repr(ex.value)
@pytest.mark.parametrize("output", TEST_ERROR_OUTPUTS)
def test_subprocess_error_does_not_expose_token(output):
"""Errors from the subprocess shouldn't expose access tokens in CLI output"""
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, raise_called_process_error(1, output=output)):
with pytest.raises(ClientAuthenticationError) as ex:
AzureCliCredential().get_token("scope")
assert "secret value" not in str(ex.value)
assert "secret value" not in repr(ex.value)
def test_timeout():
"""The credential should raise CredentialUnavailableError when the subprocess times out"""
from subprocess import TimeoutExpired
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, mock.Mock(side_effect=TimeoutExpired("", 42))):
with pytest.raises(CredentialUnavailableError):
AzureCliCredential().get_token("scope")
def test_multitenant_authentication_class():
default_tenant = "first-tenant"
first_token = "***"
second_tenant = "second-tenant"
second_token = first_token * 2
def fake_check_output(command_line, **_):
match = re.search("--tenant (.*)", command_line[-1])
tenant = match.groups()[0] if match else default_tenant
assert tenant in (default_tenant, second_tenant), 'unexpected tenant "{}"'.format(tenant)
return json.dumps(
{
"expiresOn": datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f"),
"accessToken": first_token if tenant == default_tenant else second_token,
"subscription": "some-guid",
"tenant": tenant,
"tokenType": "Bearer",
}
)
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, fake_check_output):
token = AzureCliCredential().get_token("scope")
assert token.token == first_token
token = AzureCliCredential(tenant_id=default_tenant).get_token("scope")
assert token.token == first_token
token = AzureCliCredential(tenant_id=second_tenant).get_token("scope")
assert token.token == second_token
def test_multitenant_authentication():
default_tenant = "first-tenant"
first_token = "***"
second_tenant = "second-tenant"
second_token = first_token * 2
def fake_check_output(command_line, **_):
match = re.search("--tenant (.*)", command_line[-1])
tenant = match.groups()[0] if match else default_tenant
assert tenant in (default_tenant, second_tenant), 'unexpected tenant "{}"'.format(tenant)
return json.dumps(
{
"expiresOn": datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f"),
"accessToken": first_token if tenant == default_tenant else second_token,
"subscription": "some-guid",
"tenant": tenant,
"tokenType": "Bearer",
}
)
credential = AzureCliCredential()
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, fake_check_output):
token = credential.get_token("scope")
assert token.token == first_token
token = credential.get_token("scope", tenant_id=default_tenant)
assert token.token == first_token
token = credential.get_token("scope", tenant_id=second_tenant)
assert token.token == second_token
# should still default to the first tenant
token = credential.get_token("scope")
assert token.token == first_token
def test_multitenant_authentication_not_allowed():
expected_tenant = "expected-tenant"
expected_token = "***"
def fake_check_output(command_line, **_):
match = re.search("--tenant (.*)", command_line[-1])
assert match is None or match[1] == expected_tenant
return json.dumps(
{
"expiresOn": datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f"),
"accessToken": expected_token,
"subscription": "some-guid",
"tenant": expected_token,
"tokenType": "Bearer",
}
)
credential = AzureCliCredential()
with mock.patch("shutil.which", return_value="az"):
with mock.patch(CHECK_OUTPUT, fake_check_output):
token = credential.get_token("scope")
assert token.token == expected_token
with mock.patch.dict(
"os.environ", {EnvironmentVariables.AZURE_IDENTITY_DISABLE_MULTITENANTAUTH: "true"}
):
token = credential.get_token("scope", tenant_id="un" + expected_tenant)
assert token.token == expected_token
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