Enabled TLS certificate verification in get_vault_token()

.github/workflows/ci.yml

@@ -8,6 +8,7 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+  workflow_dispatch:
 
 jobs:
   build:

CHANGELOG.md

@@ -1,5 +1,15 @@
 # BigFlow changelog
 
+## Version 1.6.0
+
+### Fixed
+
+* Enabled vault endpoint TLS certificate verification by default for `bf build` and `bf deploy` commands. This fixes the MITM attack vulnerability. Kudos to Konstantin Weddige for reporting.
+
+### Breaking changes
+
+* Default vault endpoint TLS certificate verification for `bf build` and `bf deploy` may fail in some environments. Use `-vev`/`--vault-endpoint-verify` option to disable or provide path to custom trusted certificates or CA certificates. Disabling makes execution vulnerable for MITM attacks and is discouraged - do it only when justified and in trusted environments. See [https://requests.readthedocs.io/en/latest/user/advanced/#ssl-cert-verification](https://requests.readthedocs.io/en/latest/user/advanced/#ssl-cert-verification) for details.
+
 ## Version 1.5.4
 
 ### Changed

bigflow/_version.py

@@ -1 +1 @@
-__version__ = '1.5.4'
+__version__ = '1.6.0.dev1'

bigflow/build/operate.py

@@ -95,6 +95,7 @@ def _build_docker_image(
             auth_method=cache_params.auth_method or bigflow.deploy.AuthorizationType.LOCAL_ACCOUNT,
             vault_endpoint=cache_params.vault_endpoint,
             vault_secret=cache_params.vault_secret,
+            vault_endpoint_verify=cache_params.vault_endpoint_verify
         )
 
         for image in (cache_params.cache_from_image or []):
@@ -120,6 +121,7 @@ class BuildImageCacheParams:
     vault_secret: str | None = None
     cache_from_version: list[str] | None = None
     cache_from_image: list[str] | None = None
+    vault_endpoint_verify: str | bool | None = None
 
 
 def build_image(

bigflow/cli.py

@@ -13,8 +13,7 @@
 from importlib import import_module
 from pathlib import Path
 from types import ModuleType
-from typing import Tuple, Iterator
-from typing import Optional
+from typing import Tuple, Iterator, Optional
 import fnmatch
 
 import bigflow as bf
@@ -384,6 +383,13 @@ def _add_parsers_common_arguments(parser):
 
 
 def _add_auth_parsers_arguments(parser):
+    class VaultEndpointVerifyAction(argparse.Action):
+        def __call__(self, parser, args, values, option_string=None):
+            if values in ['true', 'false']:
+                setattr(args, self.dest, values == 'true')
+            else:
+                setattr(args, self.dest, str(values))
+
     parser.add_argument('-a', '--auth-method',
                         type=bigflow.deploy.AuthorizationType,
                         default='local_account',
@@ -399,6 +405,17 @@ def _add_auth_parsers_arguments(parser):
                              'Required if auth-method is vault. '
                              'If not set, will be read from deployment_config.py.'
                         )
+    parser.add_argument('-vev', '--vault-endpoint-verify',
+                        type=str,
+                        action=VaultEndpointVerifyAction,
+                        help='Can be "true", "false", a path to certificate PEM file or a path to '
+                             'directory with PEM files (see the link for details). '
+                             'Enables/disables vault endpoint TLS certificate verification. Enabled by default. '
+                             'Disabling makes execution vulnerable for MITM attacks - do it only when justified and in trusted environments. '
+                             'For details see: https://requests.readthedocs.io/en/latest/user/advanced/#ssl-cert-verification',
+                        dest='vault_endpoint_verify',
+                        default=True
+                        )
     parser.add_argument('-vs', '--vault-secret',
                         type=str,
                         help='Vault secret token. '
@@ -514,7 +531,7 @@ def _resolve_vault_endpoint(args):
 def _resolve_property(args, property_name, ignore_value_error=False):
     try:
         cli_atr = getattr(args, property_name)
-        if cli_atr:
+        if cli_atr or cli_atr is False:
             return cli_atr
         else:
             config = import_deployment_config(_resolve_deployment_config_path(args), property_name)
@@ -533,6 +550,7 @@ def _cli_deploy_dags(args):
                        clear_dags_folder=args.clear_dags_folder,
                        auth_method=args.auth_method,
                        vault_endpoint=_resolve_vault_endpoint(args),
+                       vault_endpoint_verify=_resolve_property(args, 'vault_endpoint_verify', ignore_value_error=True),
                        vault_secret=vault_secret,
                        project_id=_resolve_property(args, 'gcp_project_id')
                        )
@@ -543,13 +561,15 @@ def _cli_deploy_image(args):
     docker_repository = _resolve_property(args, 'docker_repository')
     vault_secret = _resolve_property(args, 'vault_secret', ignore_value_error=True)
     vault_endpoint = _resolve_vault_endpoint(args)
+    vault_endpoint_verify = _resolve_property(args, 'vault_endpoint_verify', ignore_value_error=True)
     image_tar_path = args.image_tar_path if args.image_tar_path else find_image_file()
 
     bigflow.deploy.deploy_docker_image(
         image_tar_path=image_tar_path,
         auth_method=args.auth_method,
         docker_repository=docker_repository,
         vault_endpoint=vault_endpoint,
+        vault_endpoint_verify=vault_endpoint_verify,
         vault_secret=vault_secret,
     )
 
@@ -579,12 +599,14 @@ def _grab_image_cache_params(args):
         logger.debug("Image caching is requested - create build image cache params obj")
         vault_secret = _resolve_property(args, 'vault_secret', ignore_value_error=True)
         vault_endpoint = _resolve_vault_endpoint(args)
+        vault_endpoint_verify = _resolve_property(args, 'vault_endpoint_verify', ignore_value_error=True)
         return bigflow.build.operate.BuildImageCacheParams(
             auth_method=args.auth_method,
             vault_endpoint=vault_endpoint,
             vault_secret=vault_secret,
             cache_from_version=args.cache_from_version,
             cache_from_image=args.cache_from_image,
+            vault_endpoint_verify=vault_endpoint_verify
         )
     else:
         logger.debug("No caching is requested - so just disable it completly")

bigflow/deploy.py

@@ -42,6 +42,7 @@ def deploy_docker_image(
     docker_repository: str,
     auth_method: AuthorizationType = AuthorizationType.LOCAL_ACCOUNT,
     vault_endpoint: T.Optional[str] = None,
+    vault_endpoint_verify: str | bool | None = None,
     vault_secret: T.Optional[str] = None,
 ) -> str:
     if image_tar_path.endswith(".toml"):
@@ -53,6 +54,7 @@ def deploy_docker_image(
         docker_repository,
         auth_method,
         vault_endpoint,
+        vault_endpoint_verify,
         vault_secret,
     )
 
@@ -62,6 +64,7 @@ def _deploy_docker_image_from_local_repo(
     docker_repository: str,
     auth_method: AuthorizationType = AuthorizationType.LOCAL_ACCOUNT,
     vault_endpoint: str | None = None,
+    vault_endpoint_verify: str | bool | None = None,
     vault_secret: str | None = None,
 ) -> str:
 
@@ -81,6 +84,7 @@ def _deploy_docker_image_from_local_repo(
         docker_repository=docker_repository,
         auth_method=auth_method,
         vault_endpoint=vault_endpoint,
+        vault_endpoint_verify=vault_endpoint_verify,
         vault_secret=vault_secret,
         image_id=image_id,
         build_ver=build_ver,
@@ -92,6 +96,7 @@ def _deploy_docker_image_from_fs(
     docker_repository: str,
     auth_method: AuthorizationType = AuthorizationType.LOCAL_ACCOUNT,
     vault_endpoint: str | None = None,
+    vault_endpoint_verify: str | bool | None = None,
     vault_secret: str | None = None,
 ) -> str:
     build_ver = bf_commons.decode_version_number_from_file_name(Path(image_tar_path))
@@ -105,6 +110,7 @@ def _deploy_docker_image_from_fs(
             image_id=image_id,
             auth_method=auth_method,
             vault_endpoint=vault_endpoint,
+            vault_endpoint_verify=vault_endpoint_verify,
             vault_secret=vault_secret,
         )
     finally:
@@ -118,14 +124,15 @@ def _deploy_image_loaded_to_local_registry(
     image_id: str,
     auth_method: AuthorizationType,
     vault_endpoint: str | None = None,
+    vault_endpoint_verify: str | bool | None = None,
     vault_secret: str | None = None,
 ) -> str:
     docker_image = docker_repository + ":" + build_ver
     docker_image_latest = docker_repository + ":latest"
     tag_image(image_id, docker_repository, "latest")
 
     logger.info("Deploying docker image tag=%s auth_method=%s", docker_image, auth_method)
-    authenticate_to_registry(auth_method, vault_endpoint, vault_secret)
+    authenticate_to_registry(auth_method, vault_endpoint, vault_secret, vault_endpoint_verify)
     bf_commons.run_process(['docker', 'push', docker_image])
     bf_commons.run_process(['docker', 'push', docker_image_latest])
 
@@ -136,13 +143,14 @@ def authenticate_to_registry(
         auth_method: AuthorizationType,
         vault_endpoint: T.Optional[str] = None,
         vault_secret: T.Optional[str] = None,
+        vault_endpoint_verify: str | bool | None = None,
 ):
     logger.info("Authenticating to registry with auth_method=%s", auth_method)
 
     if auth_method == AuthorizationType.LOCAL_ACCOUNT:
         bf_commons.run_process(['gcloud', 'auth', 'configure-docker'])
     elif auth_method == AuthorizationType.VAULT:
-        oauthtoken = get_vault_token(vault_endpoint, vault_secret)
+        oauthtoken = get_vault_token(vault_endpoint, vault_secret, vault_endpoint_verify)
         bf_commons.run_process(
             ['docker', 'login', '-u', 'oauth2accesstoken', '--password-stdin', 'https://eu.gcr.io'],
             input=oauthtoken,
@@ -156,9 +164,10 @@ def check_images_exist(
         auth_method: AuthorizationType,
         vault_endpoint: T.Optional[str] = None,
         vault_secret: T.Optional[str] = None,
+        vault_endpoint_verify: str | bool | None = None
 ):
     logger.info("Checking if images used in DAGs exist in the registry")
-    authenticate_to_registry(auth_method, vault_endpoint, vault_secret)
+    authenticate_to_registry(auth_method, vault_endpoint, vault_secret, vault_endpoint_verify)
     missing_images = set()
     for image in images:
         found_images = bf_commons.run_process(['docker', 'manifest', 'inspect', image], check=False, verbose=False)
@@ -189,19 +198,21 @@ def deploy_dags_folder(
         clear_dags_folder: bool = False,
         auth_method: AuthorizationType = AuthorizationType.LOCAL_ACCOUNT,
         vault_endpoint: T.Optional[str] = None,
+        vault_endpoint_verify: str | bool | None = None,
         vault_secret: T.Optional[str] = None,
         gs_client: T.Optional[storage.Client] = None,
 ) -> str:
     images = get_image_tags_from_image_version_file(dags_dir)
     if images:
         check_images_exist(auth_method=auth_method,
                            vault_endpoint=vault_endpoint,
+                           vault_endpoint_verify=vault_endpoint_verify,
                            vault_secret=vault_secret,
                            images=images)
 
     logger.info("Deploying DAGs folder, auth_method=%s, clear_dags_folder=%s, dags_dir=%s", auth_method, clear_dags_folder, dags_dir)
 
-    client = gs_client or create_storage_client(auth_method, project_id, vault_endpoint, vault_secret)
+    client = gs_client or create_storage_client(auth_method, project_id, vault_endpoint, vault_secret, vault_endpoint_verify)
     bucket = client.bucket(dags_bucket)
 
     if clear_dags_folder:
@@ -246,30 +257,31 @@ def create_storage_client(
         project_id: str,
         vault_endpoint: str,
         vault_secret: str,
+        vault_endpoint_verify: str | bool | None = None
 ) -> storage.Client:
     if auth_method == AuthorizationType.LOCAL_ACCOUNT:
         return storage.Client(project=project_id)
     elif auth_method == AuthorizationType.VAULT:
-        oauthtoken = get_vault_token(vault_endpoint, vault_secret)
+        oauthtoken = get_vault_token(vault_endpoint, vault_secret, vault_endpoint_verify)
         return storage.Client(project=project_id, credentials=credentials.Credentials(oauthtoken))
     else:
         raise ValueError(f"unsupported auth_method: {auth_method!r}")
 
 
-def get_vault_token(vault_endpoint: str, vault_secret: str) -> str:
+def get_vault_token(vault_endpoint: str, vault_secret: str, vault_endpoint_verify: str | bool | None = True) -> str:
     if not vault_endpoint:
         raise ValueError('vault_endpoint is required')
     if not vault_secret:
         raise ValueError('vault_secret is required')
 
     headers = {'X-Vault-Token': vault_secret}
-    response = requests.get(vault_endpoint, headers=headers, verify=False)
+    response = requests.get(vault_endpoint, headers=headers, verify=vault_endpoint_verify)
 
+    logger.info("get oauth token from %s status_code=%s", vault_endpoint, response.status_code)
     if response.status_code != 200:
         logger.info(response.text)
         raise ValueError(
             'Could not get vault token, response code: {}'.format(
                 response.status_code))
 
-    logger.info("get oauth token from %s status_code=%s", vault_endpoint, response.status_code)
     return response.json()['data']['token']

requirements.in

@@ -12,4 +12,5 @@ bs4
 pytest
 pytest-html
 pytest-cov
-pytest-github-actions-annotate-failures
+pytest-github-actions-annotate-failures
+parameterized

requirements.txt

@@ -1,9 +1,9 @@
+# *** autogenerated: don't edit ***
+# $source-hash: sha256:758f72d93f463f46b9823c68917482b898b517bf66baaa0dc72b6b6dd534aab7
+# $source-file: requirements.in
 #
-# This file is autogenerated by pip-compile with python 3.7
-# To update, run:
-#
-#    pip-compile requirements.in
-#
+# run 'bigflow build-requirements requirements.in' to update this file
+
 apache-beam[gcp]==2.36.0
     # via -r requirements/dataflow_extras.txt
 attrs==22.1.0
@@ -205,6 +205,8 @@ packaging==21.3
     #   pytest
 pandas==1.3.5
     # via -r requirements/bigquery_extras.txt
+parameterized==0.8.1
+    # via -r requirements.in
 pep517==0.13.0
     # via build
 pexpect==4.8.0