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#!/usr/bin/python2.4
# Copyright 2004-2005 Canonical Ltd. All rights reserved.
__metaclass__ = type
import _pythonpath
import psycopg, sys, os, sets
from ConfigParser import SafeConfigParser
from optparse import OptionParser
from fti import quote_identifier
from canonical import lp
from canonical.database.sqlbase import connect
from canonical.config import config
from canonical.launchpad.scripts import logger_options, logger, db_options
class DbObject(object):
def __init__(
self, schema, name, type_, owner, arguments=None, language=None
):
self.schema = schema
self.name = name
self.type = type_
self.owner = owner
self.arguments = arguments
self.language = language
def __eq__(self, other):
return self.schema == other.schema and self.name == other.name
def fullname(self):
fn = "%s.%s" % (
quote_identifier(self.schema), quote_identifier(self.name)
)
if self.type == 'function':
fn = "%s(%s)" % (fn, self.arguments)
return fn
fullname = property(fullname)
def seqname(self):
if self.type != 'table':
return ''
return "%s.%s" % (self.schema, self.name + '_id_seq')
seqname = property(seqname)
class DbSchema(dict):
groups = None # List of groups defined in the db
users = None # List of users defined in the db
def __init__(self, con):
cur = con.cursor()
cur.execute('''
SELECT
n.nspname as "Schema",
c.relname as "Name",
CASE c.relkind
WHEN 'r' THEN 'table'
WHEN 'v' THEN 'view'
WHEN 'i' THEN 'index'
WHEN 'S' THEN 'sequence'
WHEN 's' THEN 'special'
END as "Type",
u.usename as "Owner"
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_user u ON u.usesysid = c.relowner
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN ('r','v','S','')
AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
AND pg_catalog.pg_table_is_visible(c.oid)
ORDER BY 1,2
''')
for schema, name, type_, owner in cur.fetchall():
self['%s.%s' % (schema,name)] = DbObject(schema, name, type_, owner)
cur.execute(r"""
SELECT
n.nspname as "schema",
p.proname as "name",
pg_catalog.oidvectortypes(p.proargtypes) as "Argument types",
u.usename as "owner",
l.lanname as "language"
FROM pg_catalog.pg_proc p
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
LEFT JOIN pg_catalog.pg_language l ON l.oid = p.prolang
LEFT JOIN pg_catalog.pg_user u ON u.usesysid = p.proowner
WHERE p.prorettype <> 'pg_catalog.cstring'::pg_catalog.regtype
AND p.proargtypes[0] <> 'pg_catalog.cstring'::pg_catalog.regtype
AND NOT p.proisagg
AND pg_catalog.pg_function_is_visible(p.oid)
AND n.nspname <> 'pg_catalog'
""")
for schema, name, arguments, owner, language in cur.fetchall():
self['%s.%s(%s)' % (schema, name, arguments)] = DbObject(
schema, name, 'function', owner, arguments, language
)
# Pull a list of groups
cur.execute("SELECT groname FROM pg_group")
self.groups = [r[0] for r in cur.fetchall()]
# Pull a list of users
cur.execute("SELECT usename FROM pg_user")
self.users = [r[0] for r in cur.fetchall()]
# Combined list
self.principals = self.groups + self.users
class CursorWrapper(object):
def __init__(self, cursor):
self.__dict__['_cursor'] = cursor
def execute(self, cmd, params=None):
cmd = cmd.encode('utf8')
if params is None:
log.debug('%s' % (cmd, ))
return self.__dict__['_cursor'].execute(cmd)
else:
log.debug('%s [%r]' % (cmd, params))
return self.__dict__['_cursor'].execute(cmd, params)
def __getattr__(self, key):
return getattr(self.__dict__['_cursor'], key)
def __setattr__(self, key, value):
return setattr(self.__dict__['_cursor'], key, value)
CONFIG_DEFAULTS = {
'groups': ''
}
def main(options):
# Load the config file
config = SafeConfigParser(CONFIG_DEFAULTS)
configfile_name = os.path.join(os.path.dirname(__file__), 'security.cfg')
config.read([configfile_name])
con = connect(options.dbuser)
cur = CursorWrapper(con.cursor())
schema = DbSchema(con)
# Add our two automatically maintained groups
for group in ['read', 'admin']:
if group in schema.principals:
for user in schema.users:
cur.execute("ALTER GROUP %s DROP USER %s" % (
quote_identifier(group), quote_identifier(user)
))
else:
cur.execute("CREATE GROUP %s" % quote_identifier(group))
schema.groups.append(group)
schema.principals.append(group)
# Create all required groups and users.
for section_name in config.sections():
if section_name.lower() == 'public':
continue
type_ = config.get(section_name, 'type')
if type_ == 'group':
if section_name in schema.principals:
for user in schema.users:
cur.execute("ALTER GROUP %s DROP USER %s" % (
quote_identifier(section_name), quote_identifier(user)
))
else:
cur.execute("CREATE GROUP %s" % quote_identifier(section_name))
schema.groups.append(section_name)
schema.principals.append(section_name)
elif type_ == 'user':
if section_name in schema.principals:
# Note - we don't drop the user because it might own
# objects in other databases. We need to ensure they are
# not superusers though!
cur.execute("ALTER USER %s WITH NOCREATEDB NOCREATEUSER" % (
quote_identifier(section_name),
))
else:
cur.execute("CREATE USER %s" % quote_identifier(section_name))
schema.users.append(section_name)
schema.principals.append(section_name)
else:
assert 0, "Unknown type %r for %r" % (type_, section_name)
# Add users to groups
for user in config.sections():
if config.get(user, 'type') != 'user':
continue
groups = [
g.strip() for g in config.get(user, 'groups', '').split(',')
if g.strip()
]
for group in groups:
cur.execute(r"""ALTER GROUP %s ADD USER %s""" % (
quote_identifier(group), quote_identifier(user)
))
# Change ownership of all objects to OWNER
for obj in schema.values():
if obj.type in ("function", "sequence"):
pass # Can't change ownership of functions or sequences
else:
cur.execute("ALTER TABLE %s OWNER TO %s" % (
obj.fullname, quote_identifier(options.owner)
))
# Revoke all privs
for section_name in config.sections():
for obj in schema.values():
if obj.type == 'function':
t = 'FUNCTION'
else:
t = 'TABLE'
if section_name in schema.groups:
g = 'GROUP '
else:
g = ''
cur.execute('REVOKE ALL ON %s %s FROM %s%s' % (
t, obj.fullname, g, quote_identifier(section_name)
))
if schema.has_key(obj.seqname):
cur.execute('REVOKE ALL ON %s FROM %s%s' % (
obj.seqname, g, quote_identifier(section_name),
))
# Set of all tables we have granted permissions on. After we have assigned
# permissions, we can use this to determine what tables have been
# forgotten about.
found = sets.Set()
# Set permissions as per config file
for username in config.sections():
for obj_name, perm in config.items(username):
if '.' not in obj_name:
continue
if obj_name not in schema.keys():
log.warn('Bad object name %r', obj_name)
continue
obj = schema[obj_name]
found.add(obj)
perm = perm.strip()
if not perm:
# No perm means no rights. We can't grant no rights, so skip.
continue
if username in schema.groups:
who = 'GROUP %s' % quote_identifier(username)
else:
who = quote_identifier(username)
if obj.type == 'function':
cur.execute('GRANT %s ON FUNCTION %s TO %s' % (
perm, obj.fullname, who,
))
cur.execute('GRANT EXECUTE ON FUNCTION %s TO GROUP read' % (
obj.fullname,
))
cur.execute('GRANT ALL ON FUNCTION %s TO GROUP admin' % (
obj.fullname,
))
else:
cur.execute('GRANT %s ON TABLE %s TO %s' % (
perm, obj.fullname, who,
))
cur.execute('GRANT SELECT ON TABLE %s TO GROUP read' % (
obj.fullname,
))
cur.execute('GRANT ALL ON TABLE %s TO GROUP admin' % (
obj.fullname,
))
if schema.has_key(obj.seqname):
if 'INSERT' in perm or 'UPDATE' in perm:
seqperm = 'SELECT, INSERT, UPDATE'
else:
seqperm = perm
cur.execute('GRANT %s ON %s TO %s' % (
seqperm, obj.seqname, who,
))
cur.execute('GRANT SELECT ON %s TO GROUP read' % (
obj.seqname,
))
cur.execute('GRANT ALL ON %s TO GROUP admin' % (
obj.seqname,
))
# Set permissions on public schemas
public_schemas = [
s.strip() for s in config.get('DEFAULT','public_schemas').split(',')
if s.strip()
]
for schema_name in public_schemas:
cur.execute("GRANT USAGE ON SCHEMA %s TO PUBLIC" % (
quote_identifier(schema_name),
))
for obj in schema.values():
if obj.schema not in public_schemas:
continue
found.add(obj)
if obj.type == 'function':
cur.execute('GRANT EXECUTE ON FUNCTION %s TO PUBLIC' % obj.fullname)
else:
cur.execute('GRANT SELECT ON TABLE %s TO PUBLIC' % obj.fullname)
# Raise an error if we have database objects lying around that have not
# had permissions assigned.
forgotten = sets.Set()
for obj in schema.values():
if obj not in found:
forgotten.add(obj)
forgotten = [obj.fullname for obj in forgotten
if obj.type in ['table','function','view']]
if forgotten:
log.warn('No permissions specified for %r', forgotten)
con.commit()
if __name__ == '__main__':
parser = OptionParser()
parser.add_option(
"-o", "--owner", dest="owner", default="postgres",
help="Owner of PostgreSQL objects"
)
db_options(parser)
logger_options(parser)
(options, args) = parser.parse_args()
log = logger(options)
main(options)
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