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# Copyright (C) 2005-2009 Jelmer Vernooij <jelmer@samba.org>
# 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 2 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 <http://www.gnu.org/licenses/>.
"""Authentication token retrieval."""
import subvertpy
from subvertpy import (
ra,
)
import urlparse
import urllib
from bzrlib.config import (
AuthenticationConfig,
CredentialStore,
)
from bzrlib.trace import (
mutter,
)
from bzrlib.ui import (
ui_factory,
)
class SubversionAuthenticationConfig(AuthenticationConfig):
"""Simple extended version of AuthenticationConfig that can provide
the information Subversion requires.
"""
def __init__(self, scheme, host, port, path, file=None):
super(SubversionAuthenticationConfig, self).__init__(file)
if scheme.startswith('svn+http'):
self.scheme = scheme[len("svn+"):]
else:
self.scheme = scheme
self.host = host
self.port = port
self.path = path
def get_svn_username(self, realm, may_save):
"""Look up a Subversion user name in the Bazaar authentication cache.
:param realm: Authentication realm (optional)
:param may_save: Whether or not the username should be saved.
"""
mutter("Obtaining username for SVN connection")
username = self.get_user(self.scheme, host=self.host, path=self.path,
realm=realm, ask=True)
return (username.encode('utf-8'), False)
def get_svn_simple(self, realm, username, may_save):
"""Look up a Subversion user name+password combination in the Bazaar
authentication cache.
:param realm: Authentication realm (optional)
:param username: Username, if it is already known, or None.
:param may_save: Whether or not the username should be saved.
"""
mutter("Obtaining username and password for SVN connection %r"
"(username: %r)", realm, username)
if username is None:
username = self.get_user(self.scheme,
host=self.host, path=self.path, realm=realm, ask=True)
password = self.get_password(self.scheme, host=self.host,
path=self.path, user=username,
realm=realm, prompt="%s %s password" % (realm, username))
if type(password) == unicode:
password = password.encode('utf-8')
return (username.encode("utf-8"), password, False)
def get_svn_ssl_server_trust(self, realm, failures, cert_info, may_save):
"""Return a Subversion auth provider that verifies SSL server trust.
:param realm: Realm name (optional)
:param failures: Failures to check for (bit field, SVN_AUTH_SSL_*)
:param cert_info: Certificate information
:param may_save: Whether this information may be stored.
"""
mutter("Verifying SSL server: %s", realm)
credentials = self.get_credentials(self.scheme, host=self.host)
if (credentials is not None and
credentials.has_key("verify_certificates") and
credentials["verify_certificates"] == False):
accepted_failures = (
subvertpy.SSL_NOTYETVALID +
subvertpy.SSL_EXPIRED +
subvertpy.SSL_CNMISMATCH +
subvertpy.SSL_UNKNOWNCA +
subvertpy.SSL_OTHER)
else:
accepted_failures = 0
return (accepted_failures, False)
def get_svn_username_prompt_provider(self, retries):
"""Return a Subversion auth provider for retrieving the username, as
accepted by svn_auth_open().
:param retries: Number of allowed retries.
"""
return ra.get_username_prompt_provider(self.get_svn_username,
retries)
def get_svn_simple_prompt_provider(self, retries):
"""Return a Subversion auth provider for retrieving a
username+password combination, as accepted by svn_auth_open().
:param retries: Number of allowed retries.
"""
return ra.get_simple_prompt_provider(self.get_svn_simple, retries)
def get_svn_ssl_server_trust_prompt_provider(self):
"""Return a Subversion auth provider for checking
whether a SSL server is trusted."""
return ra.get_ssl_server_trust_prompt_provider(
self.get_svn_ssl_server_trust)
def get_svn_auth_providers(self):
"""Return a list of auth providers for this authentication file.
"""
return [self.get_svn_username_prompt_provider(1),
self.get_svn_simple_prompt_provider(1),
self.get_svn_ssl_server_trust_prompt_provider()]
def get_ssl_client_cert_pw(realm, may_save):
"""Simple SSL client certificate password prompter.
:param realm: Realm, optional.
:param may_save: Whether the password can be cached.
"""
password = ui_factory.get_password(
"Please enter password for client certificate[realm=%s]" % realm)
return (password, False)
def get_ssl_client_cert_pw_provider(tries):
return ra.get_ssl_client_cert_pw_prompt_provider(
get_ssl_client_cert_pw, tries)
def get_stock_svn_providers():
providers = [ra.get_simple_provider(),
ra.get_username_provider(),
ra.get_ssl_client_cert_file_provider(),
ra.get_ssl_client_cert_pw_file_provider(),
ra.get_ssl_server_trust_file_provider(),
]
if getattr(ra, 'get_windows_simple_provider', None):
providers.append(ra.get_windows_simple_provider())
if getattr(ra, 'get_keychain_simple_provider', None):
providers.append(ra.get_keychain_simple_provider())
if getattr(ra, 'get_windows_ssl_server_trust_provider', None):
providers.append(ra.get_windows_ssl_server_trust_provider())
return providers
def create_auth_baton(url):
"""Create an authentication baton for the specified URL.
:param url: URL to create auth baton for.
"""
assert isinstance(url, str)
(scheme, netloc, path, _, _) = urlparse.urlsplit(url)
(creds, host) = urllib.splituser(netloc)
(host, port) = urllib.splitport(host)
auth_config = SubversionAuthenticationConfig(scheme, host, port, path)
# Specify Subversion providers first, because they use file data
# rather than prompting the user.
providers = []
providers += get_stock_svn_providers()
providers += auth_config.get_svn_auth_providers()
providers += [get_ssl_client_cert_pw_provider(1)]
auth_baton = ra.Auth(providers)
if creds is not None:
(user, password) = urllib.splitpasswd(creds)
if user is not None:
auth_baton.set_parameter(subvertpy.AUTH_PARAM_DEFAULT_USERNAME, user)
if password is not None:
auth_baton.set_parameter(subvertpy.AUTH_PARAM_DEFAULT_PASSWORD, password)
return auth_baton
class SubversionCredentialStore(CredentialStore):
"""Credentials provider that reads ~/.subversion/auth/"""
def __init__(self):
super(SubversionCredentialStore, self).__init__()
self.auth = ra.Auth([ra.get_simple_provider()])
def _get_realm(self, credentials):
if credentials.get('port') is None:
import socket
try:
credentials['port'] = socket.getservbyname(credentials['scheme'])
except socket.error:
mutter("Unable to look up default port for %(scheme)s" %
credentials)
return None
return "<%(scheme)s://%(host)s:%(port)s> %(realm)s" % credentials
def decode_password(self, credentials):
svn_realm = self._get_realm(credentials)
if svn_realm is None:
return None
creds = self.auth.credentials("svn.simple", svn_realm)
try:
(username, password, may_save) = creds.next()
except StopIteration:
return None
assert type(password) == str
if credentials.get("user") not in (username, None):
# Subversion changed the username
return None
return password
def get_credentials(self, scheme, host, port=None, user=None, path=None,
realm=None):
assert isinstance(realm, str) or realm is None
credentials = { "scheme": scheme, "host": host, "port": port,
"realm": realm, "user": user}
svn_realm = self._get_realm(credentials)
if svn_realm is None:
return None
creds = self.auth.credentials("svn.simple", svn_realm)
try:
(username, password, may_save) = creds.next()
except StopIteration:
return None
credentials['user'] = username
credentials['password'] = password
return credentials
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