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# -*- coding: utf-8 -*-
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# Copyright (C) 2014-2016 RhodeCode GmbH
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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"""
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SimpleVCS middleware for handling protocol request (push/clone etc.)
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It's implemented with basic auth function
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"""
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import os
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import logging
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import importlib
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from functools import wraps
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from paste.httpheaders import REMOTE_USER, AUTH_TYPE
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from webob.exc import (
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HTTPNotFound, HTTPForbidden, HTTPNotAcceptable, HTTPInternalServerError)
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import rhodecode
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from rhodecode.authentication.base import authenticate, VCS_TYPE
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from rhodecode.lib.auth import AuthUser, HasPermissionAnyMiddleware
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from rhodecode.lib.base import BasicAuth, get_ip_addr, vcs_operation_context
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from rhodecode.lib.exceptions import (
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HTTPLockedRC, HTTPRequirementError, UserCreationError,
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NotAllowedToCreateUserError)
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from rhodecode.lib.hooks_daemon import prepare_callback_daemon
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from rhodecode.lib.middleware import appenlight
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from rhodecode.lib.middleware.utils import scm_app
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from rhodecode.lib.utils import (
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is_valid_repo, get_rhodecode_realm, get_rhodecode_base_path)
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from rhodecode.lib.utils2 import safe_str, fix_PATH, str2bool
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from rhodecode.lib.vcs.conf import settings as vcs_settings
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from rhodecode.lib.vcs.backends import base
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from rhodecode.model import meta
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from rhodecode.model.db import User, Repository
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from rhodecode.model.scm import ScmModel
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log = logging.getLogger(__name__)
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def initialize_generator(factory):
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"""
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Initializes the returned generator by draining its first element.
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This can be used to give a generator an initializer, which is the code
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up to the first yield statement. This decorator enforces that the first
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produced element has the value ``"__init__"`` to make its special
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purpose very explicit in the using code.
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"""
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@wraps(factory)
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def wrapper(*args, **kwargs):
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gen = factory(*args, **kwargs)
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try:
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init = gen.next()
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except StopIteration:
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raise ValueError('Generator must yield at least one element.')
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if init != "__init__":
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raise ValueError('First yielded element must be "__init__".')
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return gen
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return wrapper
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class SimpleVCS(object):
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"""Common functionality for SCM HTTP handlers."""
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SCM = 'unknown'
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def __init__(self, application, config, registry):
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self.registry = registry
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self.application = application
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self.config = config
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# re-populated by specialized middleware
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self.repo_name = None
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self.repo_vcs_config = base.Config()
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# base path of repo locations
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self.basepath = get_rhodecode_base_path()
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# authenticate this VCS request using authfunc
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auth_ret_code_detection = \
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str2bool(self.config.get('auth_ret_code_detection', False))
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self.authenticate = BasicAuth(
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'', authenticate, registry, config.get('auth_ret_code'),
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auth_ret_code_detection)
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self.ip_addr = '0.0.0.0'
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@property
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def scm_app(self):
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custom_implementation = self.config.get('vcs.scm_app_implementation')
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if custom_implementation and custom_implementation != 'pyro4':
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log.info(
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"Using custom implementation of scm_app: %s",
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custom_implementation)
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scm_app_impl = importlib.import_module(custom_implementation)
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else:
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scm_app_impl = scm_app
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return scm_app_impl
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def _get_by_id(self, repo_name):
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"""
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Gets a special pattern _<ID> from clone url and tries to replace it
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with a repository_name for support of _<ID> non changeable urls
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"""
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data = repo_name.split('/')
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if len(data) >= 2:
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from rhodecode.model.repo import RepoModel
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by_id_match = RepoModel().get_repo_by_id(repo_name)
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if by_id_match:
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data[1] = by_id_match.repo_name
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return safe_str('/'.join(data))
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def _invalidate_cache(self, repo_name):
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"""
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Set's cache for this repository for invalidation on next access
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:param repo_name: full repo name, also a cache key
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"""
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ScmModel().mark_for_invalidation(repo_name)
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def is_valid_and_existing_repo(self, repo_name, base_path, scm_type):
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db_repo = Repository.get_by_repo_name(repo_name)
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if not db_repo:
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log.debug('Repository `%s` not found inside the database.',
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repo_name)
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return False
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if db_repo.repo_type != scm_type:
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log.warning(
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'Repository `%s` have incorrect scm_type, expected %s got %s',
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repo_name, db_repo.repo_type, scm_type)
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return False
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return is_valid_repo(repo_name, base_path, expect_scm=scm_type)
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def valid_and_active_user(self, user):
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"""
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Checks if that user is not empty, and if it's actually object it checks
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if he's active.
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:param user: user object or None
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:return: boolean
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"""
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if user is None:
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return False
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elif user.active:
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return True
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return False
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def _check_permission(self, action, user, repo_name, ip_addr=None):
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"""
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Checks permissions using action (push/pull) user and repository
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name
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:param action: push or pull action
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:param user: user instance
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:param repo_name: repository name
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"""
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# check IP
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inherit = user.inherit_default_permissions
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ip_allowed = AuthUser.check_ip_allowed(user.user_id, ip_addr,
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inherit_from_default=inherit)
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if ip_allowed:
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log.info('Access for IP:%s allowed', ip_addr)
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else:
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return False
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if action == 'push':
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if not HasPermissionAnyMiddleware('repository.write',
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'repository.admin')(user,
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repo_name):
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return False
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else:
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# any other action need at least read permission
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if not HasPermissionAnyMiddleware('repository.read',
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'repository.write',
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'repository.admin')(user,
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repo_name):
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return False
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return True
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def _check_ssl(self, environ, start_response):
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"""
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Checks the SSL check flag and returns False if SSL is not present
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and required True otherwise
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"""
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org_proto = environ['wsgi._org_proto']
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# check if we have SSL required ! if not it's a bad request !
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require_ssl = str2bool(self.repo_vcs_config.get('web', 'push_ssl'))
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if require_ssl and org_proto == 'http':
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log.debug('proto is %s and SSL is required BAD REQUEST !',
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org_proto)
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return False
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return True
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def __call__(self, environ, start_response):
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try:
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return self._handle_request(environ, start_response)
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except Exception:
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log.exception("Exception while handling request")
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appenlight.track_exception(environ)
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return HTTPInternalServerError()(environ, start_response)
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finally:
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meta.Session.remove()
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def _handle_request(self, environ, start_response):
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if not self._check_ssl(environ, start_response):
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reason = ('SSL required, while RhodeCode was unable '
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'to detect this as SSL request')
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log.debug('User not allowed to proceed, %s', reason)
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return HTTPNotAcceptable(reason)(environ, start_response)
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if not self.repo_name:
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log.warning('Repository name is empty: %s', self.repo_name)
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# failed to get repo name, we fail now
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return HTTPNotFound()(environ, start_response)
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log.debug('Extracted repo name is %s', self.repo_name)
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ip_addr = get_ip_addr(environ)
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username = None
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# skip passing error to error controller
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environ['pylons.status_code_redirect'] = True
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# ======================================================================
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# GET ACTION PULL or PUSH
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# ======================================================================
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action = self._get_action(environ)
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# ======================================================================
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# CHECK ANONYMOUS PERMISSION
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# ======================================================================
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if action in ['pull', 'push']:
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anonymous_user = User.get_default_user()
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username = anonymous_user.username
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if anonymous_user.active:
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# ONLY check permissions if the user is activated
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anonymous_perm = self._check_permission(
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action, anonymous_user, self.repo_name, ip_addr)
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else:
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anonymous_perm = False
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if not anonymous_user.active or not anonymous_perm:
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if not anonymous_user.active:
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log.debug('Anonymous access is disabled, running '
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'authentication')
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if not anonymous_perm:
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log.debug('Not enough credentials to access this '
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'repository as anonymous user')
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username = None
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# ==============================================================
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# DEFAULT PERM FAILED OR ANONYMOUS ACCESS IS DISABLED SO WE
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# NEED TO AUTHENTICATE AND ASK FOR AUTH USER PERMISSIONS
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# ==============================================================
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# try to auth based on environ, container auth methods
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log.debug('Running PRE-AUTH for container based authentication')
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pre_auth = authenticate(
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'', '', environ, VCS_TYPE, registry=self.registry)
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if pre_auth and pre_auth.get('username'):
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username = pre_auth['username']
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log.debug('PRE-AUTH got %s as username', username)
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# If not authenticated by the container, running basic auth
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if not username:
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self.authenticate.realm = get_rhodecode_realm()
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try:
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result = self.authenticate(environ)
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except (UserCreationError, NotAllowedToCreateUserError) as e:
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log.error(e)
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reason = safe_str(e)
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return HTTPNotAcceptable(reason)(environ, start_response)
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if isinstance(result, str):
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AUTH_TYPE.update(environ, 'basic')
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REMOTE_USER.update(environ, result)
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username = result
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else:
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return result.wsgi_application(environ, start_response)
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# ==============================================================
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# CHECK PERMISSIONS FOR THIS REQUEST USING GIVEN USERNAME
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# ==============================================================
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user = User.get_by_username(username)
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if not self.valid_and_active_user(user):
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return HTTPForbidden()(environ, start_response)
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username = user.username
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user.update_lastactivity()
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meta.Session().commit()
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# check user attributes for password change flag
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user_obj = user
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if user_obj and user_obj.username != User.DEFAULT_USER and \
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user_obj.user_data.get('force_password_change'):
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reason = 'password change required'
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log.debug('User not allowed to authenticate, %s', reason)
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return HTTPNotAcceptable(reason)(environ, start_response)
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# check permissions for this repository
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perm = self._check_permission(
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action, user, self.repo_name, ip_addr)
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if not perm:
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return HTTPForbidden()(environ, start_response)
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# extras are injected into UI object and later available
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# in hooks executed by rhodecode
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check_locking = _should_check_locking(environ.get('QUERY_STRING'))
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extras = vcs_operation_context(
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environ, repo_name=self.repo_name, username=username,
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action=action, scm=self.SCM,
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check_locking=check_locking)
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# ======================================================================
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# REQUEST HANDLING
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# ======================================================================
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str_repo_name = safe_str(self.repo_name)
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repo_path = os.path.join(safe_str(self.basepath), str_repo_name)
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log.debug('Repository path is %s', repo_path)
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fix_PATH()
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log.info(
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'%s action on %s repo "%s" by "%s" from %s',
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action, self.SCM, str_repo_name, safe_str(username), ip_addr)
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return self._generate_vcs_response(
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environ, start_response, repo_path, self.repo_name, extras, action)
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@initialize_generator
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def _generate_vcs_response(
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self, environ, start_response, repo_path, repo_name, extras,
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action):
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"""
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Returns a generator for the response content.
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This method is implemented as a generator, so that it can trigger
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the cache validation after all content sent back to the client. It
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also handles the locking exceptions which will be triggered when
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the first chunk is produced by the underlying WSGI application.
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"""
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callback_daemon, extras = self._prepare_callback_daemon(extras)
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config = self._create_config(extras, repo_name)
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log.debug('HOOKS extras is %s', extras)
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app = self._create_wsgi_app(repo_path, repo_name, config)
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try:
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with callback_daemon:
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try:
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response = app(environ, start_response)
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finally:
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# This statement works together with the decorator
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# "initialize_generator" above. The decorator ensures that
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# we hit the first yield statement before the generator is
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# returned back to the WSGI server. This is needed to
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# ensure that the call to "app" above triggers the
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# needed callback to "start_response" before the
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# generator is actually used.
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yield "__init__"
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for chunk in response:
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yield chunk
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except Exception as exc:
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# TODO: johbo: Improve "translating" back the exception.
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if getattr(exc, '_vcs_kind', None) == 'repo_locked':
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exc = HTTPLockedRC(*exc.args)
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_code = rhodecode.CONFIG.get('lock_ret_code')
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log.debug('Repository LOCKED ret code %s!', (_code,))
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elif getattr(exc, '_vcs_kind', None) == 'requirement':
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log.debug(
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'Repository requires features unknown to this Mercurial')
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exc = HTTPRequirementError(*exc.args)
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else:
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raise
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for chunk in exc(environ, start_response):
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yield chunk
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finally:
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# invalidate cache on push
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try:
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if action == 'push':
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self._invalidate_cache(repo_name)
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finally:
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meta.Session.remove()
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def _get_repository_name(self, environ):
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"""Get repository name out of the environmnent
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:param environ: WSGI environment
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"""
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raise NotImplementedError()
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def _get_action(self, environ):
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"""Map request commands into a pull or push command.
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:param environ: WSGI environment
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"""
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raise NotImplementedError()
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def _create_wsgi_app(self, repo_path, repo_name, config):
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"""Return the WSGI app that will finally handle the request."""
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raise NotImplementedError()
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def _create_config(self, extras, repo_name):
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"""Create a Pyro safe config representation."""
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raise NotImplementedError()
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def _prepare_callback_daemon(self, extras):
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return prepare_callback_daemon(
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extras, protocol=vcs_settings.HOOKS_PROTOCOL,
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use_direct_calls=vcs_settings.HOOKS_DIRECT_CALLS)
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def _should_check_locking(query_string):
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# this is kind of hacky, but due to how mercurial handles client-server
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# server see all operation on commit; bookmarks, phases and
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# obsolescence marker in different transaction, we don't want to check
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# locking on those
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return query_string not in ['cmd=listkeys']
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