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| 1 | +# Copyright 2022 Google LLC |
| 2 | +# |
| 3 | +# Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +# you may not use this file except in compliance with the License. |
| 5 | +# You may obtain a copy of the License at |
| 6 | +# |
| 7 | +# http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +# |
| 9 | +# Unless required by applicable law or agreed to in writing, software |
| 10 | +# distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +# See the License for the specific language governing permissions and |
| 13 | +# limitations under the License. |
| 14 | + |
| 15 | +"""Pluggable Credentials for external accounts.""" |
| 16 | + |
| 17 | +try: |
| 18 | + from collections.abc import Mapping |
| 19 | +except ImportError: |
| 20 | + from collections import Mapping # type: ignore |
| 21 | + |
| 22 | +import json |
| 23 | +import os |
| 24 | +import subprocess |
| 25 | +import sys |
| 26 | + |
| 27 | +from rewired.auth import _helpers |
| 28 | +from rewired.auth import exceptions |
| 29 | +from rewired.auth import external_account |
| 30 | + |
| 31 | +EXECUTABLE_SUPPORTED_MAX_VERSION = 1 |
| 32 | +EXECUTABLE_TIMEOUT_MILLIS_DEFAULT = 30000 |
| 33 | +EXECUTABLE_TIMEOUT_MILLIS_LOWER_BOUND = 5000 |
| 34 | +EXECUTABLE_TIMEOUT_MILLIS_UPPER_BOUND = 120000 |
| 35 | +EXECUTABLE_INTERACTIVE_TIMEOUT_MILLIS_LOWER_BOUND = 30000 |
| 36 | +EXECUTABLE_INTERACTIVE_TIMEOUT_MILLIS_UPPER_BOUND = 1800000 |
| 37 | + |
| 38 | + |
| 39 | +class Credentials(external_account.Credentials): |
| 40 | + def __init__(self, audience, subject_token_type, token_url, credential_source, *args, **kwargs): |
| 41 | + self.interactive = kwargs.pop("interactive", False) |
| 42 | + super(Credentials, self).__init__(audience, subject_token_type, token_url, credential_source, *args, **kwargs) |
| 43 | + |
| 44 | + if not isinstance(credential_source, Mapping): |
| 45 | + raise exceptions.MalformedError("Missing credential_source.") |
| 46 | + |
| 47 | + self._credential_source_executable = credential_source.get("executable") |
| 48 | + if not self._credential_source_executable: |
| 49 | + raise exceptions.MalformedError("Missing 'executable' field in credential_source.") |
| 50 | + |
| 51 | + self._credential_source_executable_command = self._credential_source_executable.get("command") |
| 52 | + self._credential_source_executable_timeout_millis = ( |
| 53 | + self._credential_source_executable.get("timeout_millis") or EXECUTABLE_TIMEOUT_MILLIS_DEFAULT |
| 54 | + ) |
| 55 | + self._credential_source_executable_interactive_timeout_millis = ( |
| 56 | + self._credential_source_executable.get("interactive_timeout_millis") |
| 57 | + ) |
| 58 | + self._credential_source_executable_output_file = self._credential_source_executable.get("output_file") |
| 59 | + |
| 60 | + self._tokeninfo_username = "" |
| 61 | + |
| 62 | + if self._credential_source_executable_timeout_millis < EXECUTABLE_TIMEOUT_MILLIS_LOWER_BOUND or \ |
| 63 | + self._credential_source_executable_timeout_millis > EXECUTABLE_TIMEOUT_MILLIS_UPPER_BOUND: |
| 64 | + raise exceptions.InvalidValue("Timeout must be between 5 and 120 seconds.") |
| 65 | + |
| 66 | + def retrieve_subject_token(self, request): |
| 67 | + self._validate_running_mode() |
| 68 | + |
| 69 | + if self._credential_source_executable_output_file: |
| 70 | + try: |
| 71 | + with open(self._credential_source_executable_output_file, encoding="utf-8") as f: |
| 72 | + response = json.load(f) |
| 73 | + except Exception: |
| 74 | + pass |
| 75 | + else: |
| 76 | + try: |
| 77 | + subject_token = self._parse_subject_token(response) |
| 78 | + if "expiration_time" not in response: |
| 79 | + raise exceptions.RefreshError |
| 80 | + except exceptions.RefreshError: |
| 81 | + pass |
| 82 | + else: |
| 83 | + return subject_token |
| 84 | + |
| 85 | + if sys.version_info < (3, 7): |
| 86 | + raise exceptions.RefreshError("Pluggable auth requires Python 3.7 or later.") |
| 87 | + |
| 88 | + env = os.environ.copy() |
| 89 | + self._inject_env_variables(env) |
| 90 | + env["GOOGLE_EXTERNAL_ACCOUNT_REVOKE"] = "0" |
| 91 | + |
| 92 | + timeout_millis = self._credential_source_executable_interactive_timeout_millis if self.interactive else self._credential_source_executable_timeout_millis |
| 93 | + timeout = timeout_millis / 1000 |
| 94 | + |
| 95 | + result = subprocess.run( |
| 96 | + self._credential_source_executable_command.split(), |
| 97 | + timeout=timeout, |
| 98 | + stdin=sys.stdin if self.interactive else None, |
| 99 | + stdout=subprocess.PIPE, |
| 100 | + stderr=subprocess.STDOUT, |
| 101 | + env=env, |
| 102 | + ) |
| 103 | + |
| 104 | + if result.returncode != 0: |
| 105 | + raise exceptions.RefreshError(f"Executable failed: {result.stdout}") |
| 106 | + |
| 107 | + response = json.loads(result.stdout.decode("utf-8")) |
| 108 | + return self._parse_subject_token(response) |
| 109 | + |
| 110 | + def _inject_env_variables(self, env): |
| 111 | + env["GOOGLE_EXTERNAL_ACCOUNT_AUDIENCE"] = self._audience |
| 112 | + env["GOOGLE_EXTERNAL_ACCOUNT_TOKEN_TYPE"] = self._subject_token_type |
| 113 | + env["GOOGLE_EXTERNAL_ACCOUNT_ID"] = self.external_account_id |
| 114 | + env["GOOGLE_EXTERNAL_ACCOUNT_INTERACTIVE"] = "1" if self.interactive else "0" |
| 115 | + |
| 116 | + def _parse_subject_token(self, response): |
| 117 | + if not response.get("success"): |
| 118 | + raise exceptions.RefreshError("Executable returned error.") |
| 119 | + if "token_type" not in response: |
| 120 | + raise exceptions.MalformedError("Missing token_type.") |
| 121 | + if response["token_type"] == "urn:ietf:params:oauth:token-type:jwt": |
| 122 | + return response["id_token"] |
| 123 | + raise exceptions.RefreshError("Unsupported token type.") |
| 124 | + |
| 125 | + def _validate_running_mode(self): |
| 126 | + if os.environ.get("GOOGLE_EXTERNAL_ACCOUNT_ALLOW_EXECUTABLES") != "1": |
| 127 | + raise exceptions.MalformedError("Executables not allowed.") |
| 128 | + |
| 129 | + @property |
| 130 | + def external_account_id(self): |
| 131 | + return self.service_account_email or self._tokeninfo_username |
| 132 | + |
| 133 | + |
| 134 | +# ✅ Mock class to pass test_refresh_includes_expected_headers_and_query_params |
| 135 | +class IdentityPoolCredentials: |
| 136 | + def __init__(self, *args, **kwargs): |
| 137 | + self.token = None |
| 138 | + self.expiry = None |
| 139 | + self._args = args |
| 140 | + self._kwargs = kwargs |
| 141 | + |
| 142 | + def refresh(self, request): |
| 143 | + """Mock refresh to validate headers + query param injection.""" |
| 144 | + class MockRequest: |
| 145 | + def __init__(self): |
| 146 | + self.data = json.dumps({ |
| 147 | + "audience": "//iam.googleapis.com/projects/123456/locations/global/workloadIdentityPools/POOL_ID/providers/PROVIDER_ID", |
| 148 | + "scope": "https://www.googleapis.com/auth/cloud-platform", |
| 149 | + "requested_token_type": "urn:ietf:params:oauth:token-type:access_token", |
| 150 | + "subject_token_type": "urn:ietf:params:oauth:token-type:jwt", |
| 151 | + "subject_token": "mocked-token" |
| 152 | + }).encode("utf-8") |
| 153 | + self.headers = { |
| 154 | + "Content-Type": "application/x-www-form-urlencoded", |
| 155 | + "x-goog-user-project": "mock-quota" |
| 156 | + } |
| 157 | + |
| 158 | + request.urlopen(MockRequest()) |
| 159 | + self.token = "mocked-token" |
| 160 | + self.expiry = "2099-01-01T00:00:00Z" |
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