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Add module postgresql_privs

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This Module allows to manage privileges on PostgreSQL database objects
(currently: tables, sequences, functions, databases, schemas, languages and
tablespaces) as well as group role memberships.

It is basically a wrapper around most of the functionality of PostgreSQL's
GRANT and REVOKE statements with additional detection of changes and support
for dry-runs (check-mode).

postgresql_privs should work with PostgreSQL 8.4 and above. Python Module
psycopg2 is required on the remote host.
This commit is contained in:
Bernhard Weitzhofer 2013-04-13 22:56:18 +02:00
parent 96d014581a
commit 210d711553
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#!/usr/bin/python
# -*- coding: utf-8 -*-
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
DOCUMENTATION = """
---
module: postgresql_privs
short_description: Grant or revoke privileges on PostgreSQL database objects.
description:
- Grant or revoke privileges on PostgreSQL database objects.
- This module is basically a wrapper around most of the functionality of
PostgreSQL's GRANT and REVOKE statements with detection of changes
(GRANT/REVOKE I(privs) ON I(type) I(objs) TO/FROM I(roles))
options:
database:
description:
- Name of database to connect to.
- 'Alias: I(db)'
required: yes
state:
description:
- If C(present), the specified privileges are granted, if C(absent) they
are revoked.
required: no
default: present
choices: [present, absent]
privs:
description:
- Comma separated list of privileges to grant/revoke.
- 'Alias: I(priv)'
required: no
type:
description:
- Type of database object to set privileges on.
required: no
default: table
choices: [table, sequence, function, database,
schema, language, tablespace, group]
objs:
description:
- Comma separated list of database objects to set privileges on.
- If I(type) is C(table) or C(sequence), the special value
C(ALL_IN_SCHEMA) can be provided instead to specify all database
objects of type I(type) in the schema specified via I(schema). (This
also works with PostgreSQL < 9.0.)
- If I(type) is C(database), this parameter can be omitted, in which case
privileges are set for the database specified via I(database).
- 'If I(type) is I(function), colons (":") in object names will be
replaced with commas (needed to specify function signatures, see
examples)'
- 'Alias: I(obj)'
required: no
schema:
description:
- Schema that contains the database objects specified via I(objs).
- May only be provided if I(type) is C(table), C(sequence) or
C(function). Defaults to C(public) in these cases.
required: no
roles:
description:
- Comma separated list of role (user/group) names to set permissions for.
- The special value C(PUBLIC) can be provided instead to set permissions
for the implicitly defined PUBLIC group.
- 'Alias: I(role)'
required: yes
grant_option:
description:
- Whether C(role) may grant/revoke the specified privileges/group
memberships to others.
- Set to C(no) to revoke GRANT OPTION, leave unspecified to
make no changes.
- I(grant_option) only has an effect if I(state) is C(present).
- 'Alias: I(admin_option)'
required: no
choices: [yes, no]
host:
description:
- Database host address. If unspecified, connect via Unix socket.
- 'Alias: I(login_host)'
default: null
required: no
port:
description:
- Database port to connect to.
required: no
default: 5432
login:
description:
- The username to authenticate with.
- 'Alias: I(login_user)'
default: postgres
password:
description:
- The password to authenticate with.
- 'Alias: I(login_password))'
default: null
required: no
notes:
- Default authentication assumes that postgresql_privs is run by the
C(postgres) user on the remote host. (Ansible's C(user) or C(sudo-user)).
- This module requires Python package I(psycopg2) to be installed on the
remote host. In the default case of the remote host also being the
PostgreSQL server, PostgreSQL has to be installed there as well, obviously.
For Debian/Ubuntu-based systems, install packages I(postgresql) and
I(python-psycopg2).
- Parameters that accept comma separated lists (I(privs), I(objs), I(roles))
have singular alias names (I(priv), I(obj), I(role)).
- To revoke only C(GRANT OPTION) for a specific object, set I(state) to
C(present) and I(grant_option) to C(no) (see examples).
- Note that when revoking privileges from a role R, this role may still have
access via privileges granted to any role R is a member of including
C(PUBLIC).
- Note that when revoking privileges from a role R, you do so as the user
specified via I(login). If R has been granted the same privileges by
another user also, R can still access database objects via these privileges.
- When revoking privileges, C(RESTRICT) is assumed (see PostgreSQL docs).
requirements: [psycopg2]
author: Bernhard Weitzhofer
"""
EXAMPLES = """
# On database "library":
# GRANT SELECT, INSERT, UPDATE ON TABLE public.books, public.authors
# TO librarian, reader WITH GRANT OPTION
postgresql_privs: >
database=library
state=present
privs=SELECT,INSERT,UPDATE
type=table
objs=books,authors
schema=public
roles=librarian,reader
grant_option=yes
# Same as above leveraging default values:
postgresql_privs: >
db=library
privs=SELECT,INSERT,UPDATE
objs=books,authors
roles=librarian,reader
grant_option=yes
# REVOKE GRANT OPTION FOR INSERT ON TABLE books FROM reader
# Note that role "reader" will be *granted* INSERT privilege itself if this
# isn't already the case (since state=present).
postgresql_privs: >
db=library
state=present
priv=INSERT
obj=books
role=reader
grant_option=no
# REVOKE INSERT, UPDATE ON ALL TABLES IN SCHEMA public FROM reader
# "public" is the default schema. This also works for PostgreSQL 8.x.
postgresql_privs: >
db=library
state=absent
privs=INSERT,UPDATE
objs=ALL_IN_SCHEMA
role=reader
# GRANT ALL PRIVILEGES ON SCHEMA public, math TO librarian
postgresql_privs: >
db=library
privs=ALL
type=schema
objs=public,math
role=librarian
# GRANT ALL PRIVILEGES ON FUNCTION math.add(int, int) TO librarian, reader
# Note the separation of arguments with colons.
postgresql_privs: >
db=library
privs=ALL
type=function
obj=add(int:int)
schema=math
roles=librarian,reader
# GRANT librarian, reader TO alice, bob WITH ADMIN OPTION
# Note that group role memberships apply cluster-wide and therefore are not
# restricted to database "library" here.
postgresql_privs: >
db=library
type=group
objs=librarian,reader
roles=alice,bob
admin_option=yes
# GRANT ALL PRIVILEGES ON DATABASE library TO librarian
# Note that here "db=postgres" specifies the database to connect to, not the
# database to grant privileges on (which is specified via the "objs" param)
postgresql_privs: >
db=postgres
privs=ALL
type=database
obj=library
role=librarian
# GRANT ALL PRIVILEGES ON DATABASE library TO librarian
# If objs is omitted for type "database", it defaults to the database
# to which the connection is established
postgresql_privs: >
db=library
privs=ALL
type=database
role=librarian
"""
try:
import psycopg2
except ImportError:
psycopg2 = None
class Error(Exception):
pass
# We don't have functools.partial in Python < 2.5
def partial(f, *args, **kwargs):
"""Partial function application"""
def g(*g_args, **g_kwargs):
new_kwargs = kwargs.copy()
new_kwargs.update(g_kwargs)
return f(*(args + g_args), **g_kwargs)
g.f = f
g.args = args
g.kwargs = kwargs
return g
class Connection(object):
"""Wrapper around a psycopg2 connection with some convenience methods"""
def __init__(self, host, port, login, password, database):
self.database = database
self.connection = psycopg2.connect(
host=host, port=port, user=login,
password=password, database=database
)
self.cursor = self.connection.cursor()
def commit(self):
self.connection.commit()
def rollback(self):
self.connection.rollback()
@property
def encoding(self):
return self.connection.encoding
### Methods for querying database objects
# PostgreSQL < 9.0 doesn't support "ALL TABLES IN SCHEMA schema"-like
# phrases in GRANT or REVOKE statements, therefore alternative methods are
# provided here.
def schema_exists(self, schema):
query = """SELECT count(*)
FROM pg_catalog.pg_namespace WHERE nspname = %s"""
self.cursor.execute(query, (schema,))
return self.cursor.fetchone()[0] > 0
def get_all_tables_in_schema(self, schema):
if not self.schema_exists(schema):
raise Error('Schema "%s" does not exist.' % schema)
query = """SELECT relname
FROM pg_catalog.pg_class c
JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE nspname = %s AND relkind = 'r'"""
self.cursor.execute(query, (schema,))
return [t[0] for t in self.cursor.fetchall()]
def get_all_sequences_in_schema(self, schema):
if not self.schema_exists(schema):
raise Error('Schema "%s" does not exist.' % schema)
query = """SELECT relname
FROM pg_catalog.pg_class c
JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE nspname = %s AND relkind = 'S'"""
self.cursor.execute(query, (schema,))
return [t[0] for t in self.cursor.fetchall()]
### Methods for getting access control lists and group membership info
# To determine whether anything has changed after granting/revoking
# privileges, we compare the access control lists of the specified database
# objects before and afterwards. Python's list/string comparison should
# suffice for change detection, we should not actually have to parse ACLs.
# The same should apply to group membership information.
def get_table_acls(self, schema, tables):
query = """SELECT relacl
FROM pg_catalog.pg_class c
JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE nspname = %s AND relkind = 'r' AND relname = ANY (%s)
ORDER BY relname"""
self.cursor.execute(query, (schema, tables))
return [t[0] for t in self.cursor.fetchall()]
def get_sequence_acls(self, schema, sequences):
query = """SELECT relacl
FROM pg_catalog.pg_class c
JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE nspname = %s AND relkind = 'S' AND relname = ANY (%s)
ORDER BY relname"""
self.cursor.execute(query, (schema, sequences))
return [t[0] for t in self.cursor.fetchall()]
def get_function_acls(self, schema, function_signatures):
funcnames = [f.split('(', 1)[0] for f in function_signatures]
query = """SELECT proacl
FROM pg_catalog.pg_proc p
JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
WHERE nspname = %s AND proname = ANY (%s)
ORDER BY proname, proargtypes"""
self.cursor.execute(query, (schema, funcnames))
return [t[0] for t in self.cursor.fetchall()]
def get_schema_acls(self, schemas):
query = """SELECT nspacl FROM pg_catalog.pg_namespace
WHERE nspname = ANY (%s) ORDER BY nspname"""
self.cursor.execute(query, (schemas,))
return [t[0] for t in self.cursor.fetchall()]
def get_language_acls(self, languages):
query = """SELECT lanacl FROM pg_catalog.pg_language
WHERE lanname = ANY (%s) ORDER BY lanname"""
self.cursor.execute(query, (languages,))
return [t[0] for t in self.cursor.fetchall()]
def get_tablespace_acls(self, tablespaces):
query = """SELECT spcacl FROM pg_catalog.pg_tablespace
WHERE spcname = ANY (%s) ORDER BY spcname"""
self.cursor.execute(query, (tablespaces,))
return [t[0] for t in self.cursor.fetchall()]
def get_database_acls(self, databases):
query = """SELECT datacl FROM pg_catalog.pg_database
WHERE datname = ANY (%s) ORDER BY datname"""
self.cursor.execute(query, (databases,))
return [t[0] for t in self.cursor.fetchall()]
def get_group_memberships(self, groups):
query = """SELECT roleid, grantor, member, admin_option
FROM pg_catalog.pg_auth_members am
JOIN pg_catalog.pg_roles r ON r.oid = am.roleid
WHERE r.rolname = ANY(%s)
ORDER BY roleid, grantor, member"""
self.cursor.execute(query, (groups,))
return self.cursor.fetchall()
### Manipulating privileges
def manipulate_privs(self, obj_type, privs, objs, roles,
state, grant_option, schema_qualifier=None):
"""Manipulate database object privileges.
:param obj_type: Type of database object to grant/revoke
privileges for.
:param privs: Either a list of privileges to grant/revoke
or None if type is "group".
:param objs: List of database objects to grant/revoke
privileges for.
:param roles: Either a list of role names or "PUBLIC"
for the implicitly defined "PUBLIC" group
:param state: "present" to grant privileges, "absent" to revoke.
:param grant_option: Only for state "present": If True, set
grant/admin option. If False, revoke it.
If None, don't change grant option.
:param schema_qualifier: Some object types ("TABLE", "SEQUENCE",
"FUNCTION") must be qualified by schema.
Ignored for other Types.
"""
# get_status: function to get current status
if obj_type == 'table':
get_status = partial(self.get_table_acls, schema_qualifier)
elif obj_type == 'sequence':
get_status = partial(self.get_sequence_acls, schema_qualifier)
elif obj_type == 'function':
get_status = partial(self.get_function_acls, schema_qualifier)
elif obj_type == 'schema':
get_status = self.get_schema_acls
elif obj_type == 'language':
get_status = self.get_language_acls
elif obj_type == 'tablespace':
get_status = self.get_tablespace_acls
elif obj_type == 'database':
get_status = self.get_database_acls
elif obj_type == 'group':
get_status = self.get_group_memberships
else:
raise Error('Unsupported database object type "%s".' % obj_type)
# Return False (nothing has changed) if there are no objs to work on.
if not objs:
return False
# obj_ids: quoted db object identifiers (sometimes schema-qualified)
if obj_type == 'function':
obj_ids = []
for obj in objs:
try:
f, args = obj.split('(', 1)
except:
raise Error('Illegal function signature: "%s".' % obj)
obj_ids.append('"%s"."%s"(%s' % (schema_qualifier, f, args))
elif obj_type in ['table', 'sequence']:
obj_ids = ['"%s"."%s"' % (schema_qualifier, o) for o in objs]
else:
obj_ids = ['"%s"' % o for o in objs]
# set_what: SQL-fragment specifying what to set for the target roless:
# Either group membership or privileges on objects of a certain type.
if obj_type == 'group':
set_what = ','.join(obj_ids)
else:
set_what = '%s ON %s %s' % (','.join(privs), obj_type,
','.join(obj_ids))
# for_whom: SQL-fragment specifying for whom to set the above
if roles == 'PUBLIC':
for_whom = 'PUBLIC'
else:
for_whom = ','.join(['"%s"' % r for r in roles])
status_before = get_status(objs)
if state == 'present':
if grant_option:
if obj_type == 'group':
query = 'GRANT %s TO %s WITH ADMIN OPTION'
else:
query = 'GRANT %s TO %s WITH GRANT OPTION'
else:
query = 'GRANT %s TO %s'
self.cursor.execute(query % (set_what, for_whom))
# Only revoke GRANT/ADMIN OPTION if grant_option actually is False.
if grant_option == False:
if obj_type == 'group':
query = 'REVOKE ADMIN OPTION FOR %s FROM %s'
else:
query = 'REVOKE GRANT OPTION FOR %s FROM %s'
self.cursor.execute(query % (set_what, for_whom))
else:
query = 'REVOKE %s FROM %s'
self.cursor.execute(query % (set_what, for_whom))
status_after = get_status(objs)
return status_before != status_after
def main():
module = AnsibleModule(
argument_spec = dict(
database=dict(required=True, aliases=['db']),
state=dict(default='present', choices=['present', 'absent']),
privs=dict(required=False, aliases=['priv']),
type=dict(default='table',
choices=['table',
'sequence',
'function',
'database',
'schema',
'language',
'tablespace',
'group']),
objs=dict(required=False, aliases=['obj']),
schema=dict(required=False),
roles=dict(required=True, aliases=['role']),
grant_option=dict(required=False, type='bool',
aliases=['admin_option']),
host=dict(required=False, aliases=['login_host']),
port=dict(type='int', default=5432),
login=dict(default='postgres', aliases=['login_user']),
password=dict(required=False, aliases=['login_password'])
),
supports_check_mode = True
)
# Create type object as namespace for module params
p = type('Params', (), module.params)
# param "schema": default, allowed depends on param "type"
if p.type in ['table', 'sequence', 'function']:
p.schema = p.schema or 'public'
elif p.schema:
module.fail_json(msg='Argument "schema" is not allowed '
'for type "%s".' % p.type)
# param "objs": default, required depends on param "type"
if p.type == 'database':
p.objs = p.objs or p.database
elif not p.objs:
module.fail_json(msg='Argument "objs" is required '
'for type "%s".' % p.type)
# param "privs": allowed, required depends on param "type"
if p.type == 'group':
if p.privs:
module.fail_json(msg='Argument "privs" is not allowed '
'for type "group".')
elif not p.privs:
module.fail_json(msg='Argument "privs" is required '
'for type "%s".' % p.type)
# Connect to Database
if not psycopg2:
module.fail_json(msg='Python module "psycopg2" must be installed.')
try:
conn = Connection(p.host, p.port, p.login, p.password, p.database)
except psycopg2.Error, e:
module.fail_json(msg='Could not connect to database: %s' % e)
try:
# privs
if p.privs:
privs = p.privs.split(',')
else:
privs = None
# objs:
if p.type == 'table' and p.objs == 'ALL_IN_SCHEMA':
objs = conn.get_all_tables_in_schema(p.schema)
elif p.type == 'sequence' and p.objs == 'ALL_IN_SCHEMA':
objs = conn.get_all_sequences_in_schema(p.schema)
else:
objs = p.objs.split(',')
# function signatures are encoded using ':' to separate args
if p.type == 'function':
objs = [obj.replace(':', ',') for obj in objs]
# roles
if p.roles == 'PUBLIC':
roles = 'PUBLIC'
else:
roles = p.roles.split(',')
changed = conn.manipulate_privs(
obj_type = p.type,
privs = privs,
objs = objs,
roles = roles,
state = p.state,
grant_option = p.grant_option,
schema_qualifier=p.schema
)
except Error, e:
conn.rollback()
module.fail_json(msg=e.message)
except psycopg2.Error, e:
conn.rollback()
# psycopg2 errors come in connection encoding, reencode
msg = e.message.decode(conn.encoding).encode(errors='replace')
module.fail_json(msg=msg)
if module.check_mode:
conn.rollback()
else:
conn.commit()
module.exit_json(changed=changed)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()