# -*- coding: utf-8 -*- """ rhodecode.lib.middleware.simplehg ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SimpleHG middleware for handling mercurial protocol request (push/clone etc.). It's implemented with basic auth function :created_on: Apr 28, 2010 :author: marcink :copyright: (C) 2009-2010 Marcin Kuzminski :license: GPLv3, see COPYING for more details. """ # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . import os import logging import traceback from mercurial.error import RepoError from mercurial.hgweb import hgweb from mercurial.hgweb.request import wsgiapplication from paste.auth.basic import AuthBasicAuthenticator from paste.httpheaders import REMOTE_USER, AUTH_TYPE from rhodecode.lib import safe_str from rhodecode.lib.auth import authfunc, HasPermissionAnyMiddleware from rhodecode.lib.utils import make_ui, invalidate_cache, \ check_repo_fast, ui_sections from rhodecode.model.user import UserModel from webob.exc import HTTPNotFound, HTTPForbidden, HTTPInternalServerError log = logging.getLogger(__name__) def is_mercurial(environ): """Returns True if request's target is mercurial server - header ``HTTP_ACCEPT`` of such request would start with ``application/mercurial``. """ http_accept = environ.get('HTTP_ACCEPT') if http_accept and http_accept.startswith('application/mercurial'): return True return False class SimpleHg(object): def __init__(self, application, config): self.application = application self.config = config #authenticate this mercurial request using authfunc self.authenticate = AuthBasicAuthenticator('', authfunc) self.ipaddr = '0.0.0.0' self.repo_name = None self.username = None self.action = None def __call__(self, environ, start_response): if not is_mercurial(environ): return self.application(environ, start_response) proxy_key = 'HTTP_X_REAL_IP' def_key = 'REMOTE_ADDR' self.ipaddr = environ.get(proxy_key, environ.get(def_key, '0.0.0.0')) # skip passing error to error controller environ['pylons.status_code_redirect'] = True #====================================================================== # GET ACTION PULL or PUSH #====================================================================== self.action = self.__get_action(environ) try: #================================================================== # GET REPOSITORY NAME #================================================================== self.repo_name = self.__get_repository(environ) except: return HTTPInternalServerError()(environ, start_response) #====================================================================== # CHECK ANONYMOUS PERMISSION #====================================================================== if self.action in ['pull', 'push']: anonymous_user = self.__get_user('default') self.username = anonymous_user.username anonymous_perm = self.__check_permission(self.action, anonymous_user, self.repo_name) if anonymous_perm is not True or anonymous_user.active is False: if anonymous_perm is not True: log.debug('Not enough credentials to access this ' 'repository as anonymous user') if anonymous_user.active is False: log.debug('Anonymous access is disabled, running ' 'authentication') #============================================================== # DEFAULT PERM FAILED OR ANONYMOUS ACCESS IS DISABLED SO WE # NEED TO AUTHENTICATE AND ASK FOR AUTH USER PERMISSIONS #============================================================== if not REMOTE_USER(environ): self.authenticate.realm = \ safe_str(self.config['rhodecode_realm']) result = self.authenticate(environ) if isinstance(result, str): AUTH_TYPE.update(environ, 'basic') REMOTE_USER.update(environ, result) else: return result.wsgi_application(environ, start_response) #============================================================== # CHECK PERMISSIONS FOR THIS REQUEST USING GIVEN USERNAME FROM # BASIC AUTH #============================================================== if self.action in ['pull', 'push']: username = REMOTE_USER(environ) try: user = self.__get_user(username) self.username = user.username except: log.error(traceback.format_exc()) return HTTPInternalServerError()(environ, start_response) #check permissions for this repository perm = self.__check_permission(self.action, user, self.repo_name) if perm is not True: return HTTPForbidden()(environ, start_response) self.extras = {'ip': self.ipaddr, 'username': self.username, 'action': self.action, 'repository': self.repo_name} #====================================================================== # MERCURIAL REQUEST HANDLING #====================================================================== environ['PATH_INFO'] = '/' # since we wrap into hgweb, reset the path self.baseui = make_ui('db') self.basepath = self.config['base_path'] self.repo_path = os.path.join(self.basepath, self.repo_name) #quick check if that dir exists... if check_repo_fast(self.repo_name, self.basepath): return HTTPNotFound()(environ, start_response) try: app = wsgiapplication(self.__make_app) except RepoError, e: if str(e).find('not found') != -1: return HTTPNotFound()(environ, start_response) except Exception: log.error(traceback.format_exc()) return HTTPInternalServerError()(environ, start_response) #invalidate cache on push if self.action == 'push': self.__invalidate_cache(self.repo_name) return app(environ, start_response) def __make_app(self): """ Make an wsgi application using hgweb, and inject generated baseui instance, additionally inject some extras into ui object """ self.__inject_extras(self.baseui, self.extras) return hgweb(str(self.repo_path), baseui=self.baseui) def __check_permission(self, action, user, repo_name): """ Checks permissions using action (push/pull) user and repository name :param action: push or pull action :param user: user instance :param repo_name: repository name """ if action == 'push': if not HasPermissionAnyMiddleware('repository.write', 'repository.admin')(user, repo_name): return False else: #any other action need at least read permission if not HasPermissionAnyMiddleware('repository.read', 'repository.write', 'repository.admin')(user, repo_name): return False return True def __get_repository(self, environ): """ Get's repository name out of PATH_INFO header :param environ: environ where PATH_INFO is stored """ try: repo_name = '/'.join(environ['PATH_INFO'].split('/')[1:]) if repo_name.endswith('/'): repo_name = repo_name.rstrip('/') except: log.error(traceback.format_exc()) raise return repo_name def __get_user(self, username): return UserModel().get_by_username(username, cache=True) def __get_action(self, environ): """ Maps mercurial request commands into a clone,pull or push command. This should always return a valid command string :param environ: """ mapping = {'changegroup': 'pull', 'changegroupsubset': 'pull', 'stream_out': 'pull', 'listkeys': 'pull', 'unbundle': 'push', 'pushkey': 'push', } for qry in environ['QUERY_STRING'].split('&'): if qry.startswith('cmd'): cmd = qry.split('=')[-1] if cmd in mapping: return mapping[cmd] else: return 'pull' def __invalidate_cache(self, repo_name): """we know that some change was made to repositories and we should invalidate the cache to see the changes right away but only for push requests""" invalidate_cache('get_repo_cached_%s' % repo_name) def __inject_extras(self, baseui, extras={}): """ Injects some extra params into baseui instance also overwrites global settings with those takes from local hgrc file :param baseui: baseui instance :param extras: dict with extra params to put into baseui """ hgrc = os.path.join(self.repo_path, '.hg', 'hgrc') #inject some additional parameters that will be available in ui #for hooks for k, v in extras.items(): baseui.setconfig('rhodecode_extras', k, v) repoui = make_ui('file', hgrc, False) if repoui: #overwrite our ui instance with the section from hgrc file for section in ui_sections: for k, v in repoui.configitems(section): baseui.setconfig(section, k, v)