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667 lines
25 KiB
Python
667 lines
25 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible 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 General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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DOCUMENTATION = '''
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---
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module: postgresql_user
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short_description: Adds or removes a users (roles) from a PostgreSQL database.
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description:
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- Add or remove PostgreSQL users (roles) from a remote host and, optionally,
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grant the users access to an existing database or tables.
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- The fundamental function of the module is to create, or delete, roles from
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a PostgreSQL cluster. Privilege assignment, or removal, is an optional
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step, which works on one database at a time. This allows for the module to
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be called several times in the same module to modify the permissions on
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different databases, or to grant permissions to already existing users.
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- A user cannot be removed until all the privileges have been stripped from
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the user. In such situation, if the module tries to remove the user it
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will fail. To avoid this from happening the fail_on_user option signals
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the module to try to remove the user, but if not possible keep going; the
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module will report if changes happened and separately if the user was
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removed or not.
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version_added: "0.6"
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options:
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name:
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description:
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- name of the user (role) to add or remove
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required: true
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default: null
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password:
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description:
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- set the user's password, before 1.4 this was required.
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- "When passing an encrypted password, the encrypted parameter must also be true, and it must be generated with the format C('str[\\"md5\\"] + md5[ password + username ]'), resulting in a total of 35 characters. An easy way to do this is: C(echo \\"md5`echo -n \\"verysecretpasswordJOE\\" | md5`\\"). Note that if encrypted is set, the stored password will be hashed whether or not it is pre-encrypted."
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required: false
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default: null
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db:
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description:
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- name of database where permissions will be granted
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required: false
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default: null
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fail_on_user:
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description:
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- if C(yes), fail when user can't be removed. Otherwise just log and continue
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required: false
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default: 'yes'
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choices: [ "yes", "no" ]
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port:
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description:
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- Database port to connect to.
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required: false
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default: 5432
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login_user:
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description:
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- User (role) used to authenticate with PostgreSQL
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required: false
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default: postgres
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login_password:
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description:
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- Password used to authenticate with PostgreSQL
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required: false
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default: null
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login_host:
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description:
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- Host running PostgreSQL.
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required: false
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default: localhost
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login_unix_socket:
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description:
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- Path to a Unix domain socket for local connections
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required: false
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default: null
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priv:
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description:
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- "PostgreSQL privileges string in the format: C(table:priv1,priv2)"
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required: false
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default: null
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role_attr_flags:
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description:
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- "PostgreSQL role attributes string in the format: CREATEDB,CREATEROLE,SUPERUSER"
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required: false
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default: ""
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choices: [ "[NO]SUPERUSER","[NO]CREATEROLE", "[NO]CREATEUSER", "[NO]CREATEDB",
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"[NO]INHERIT", "[NO]LOGIN", "[NO]REPLICATION" ]
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state:
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description:
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- The user (role) state
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required: false
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default: present
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choices: [ "present", "absent" ]
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encrypted:
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description:
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- whether the password is stored hashed in the database. boolean. Passwords can be passed already hashed or unhashed, and postgresql ensures the stored password is hashed when encrypted is set.
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required: false
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default: false
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version_added: '1.4'
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expires:
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description:
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- sets the user's password expiration.
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required: false
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default: null
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version_added: '1.4'
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no_password_changes:
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description:
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- if C(yes), don't inspect database for password changes. Effective when C(pg_authid) is not accessible (such as AWS RDS). Otherwise, make password changes as necessary.
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required: false
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default: 'no'
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choices: [ "yes", "no" ]
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version_added: '2.0'
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notes:
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- The default authentication assumes that you are either logging in as or
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sudo'ing to the postgres account on the host.
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- This module uses psycopg2, a Python PostgreSQL database adapter. You must
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ensure that psycopg2 is installed on the host before using this module. If
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the remote host is the PostgreSQL server (which is the default case), then
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PostgreSQL must also be installed on the remote host. For Ubuntu-based
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systems, install the postgresql, libpq-dev, and python-psycopg2 packages
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on the remote host before using this module.
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- If the passlib library is installed, then passwords that are encrypted
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in the DB but not encrypted when passed as arguments can be checked for
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changes. If the passlib library is not installed, unencrypted passwords
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stored in the DB encrypted will be assumed to have changed.
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- If you specify PUBLIC as the user, then the privilege changes will apply
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to all users. You may not specify password or role_attr_flags when the
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PUBLIC user is specified.
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requirements: [ psycopg2 ]
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author: "Ansible Core Team"
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'''
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EXAMPLES = '''
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# Create django user and grant access to database and products table
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- postgresql_user: db=acme name=django password=ceec4eif7ya priv=CONNECT/products:ALL
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# Create rails user, grant privilege to create other databases and demote rails from super user status
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- postgresql_user: name=rails password=secret role_attr_flags=CREATEDB,NOSUPERUSER
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# Remove test user privileges from acme
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- postgresql_user: db=acme name=test priv=ALL/products:ALL state=absent fail_on_user=no
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# Remove test user from test database and the cluster
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- postgresql_user: db=test name=test priv=ALL state=absent
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# Example privileges string format
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INSERT,UPDATE/table:SELECT/anothertable:ALL
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# Remove an existing user's password
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- postgresql_user: db=test user=test password=NULL
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'''
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import re
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import itertools
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try:
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import psycopg2
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import psycopg2.extras
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except ImportError:
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postgresqldb_found = False
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else:
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postgresqldb_found = True
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from ansible.module_utils.six import iteritems
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_flags = ('SUPERUSER', 'CREATEROLE', 'CREATEUSER', 'CREATEDB', 'INHERIT', 'LOGIN', 'REPLICATION')
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VALID_FLAGS = frozenset(itertools.chain(_flags, ('NO%s' % f for f in _flags)))
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VALID_PRIVS = dict(table=frozenset(('SELECT', 'INSERT', 'UPDATE', 'DELETE', 'TRUNCATE', 'REFERENCES', 'TRIGGER', 'ALL')),
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database=frozenset(('CREATE', 'CONNECT', 'TEMPORARY', 'TEMP', 'ALL')),
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)
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# map to cope with idiosyncracies of SUPERUSER and LOGIN
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PRIV_TO_AUTHID_COLUMN = dict(SUPERUSER='rolsuper', CREATEROLE='rolcreaterole',
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CREATEUSER='rolcreateuser', CREATEDB='rolcreatedb',
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INHERIT='rolinherit', LOGIN='rolcanlogin',
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REPLICATION='rolreplication')
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class InvalidFlagsError(Exception):
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pass
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class InvalidPrivsError(Exception):
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pass
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# ===========================================
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# PostgreSQL module specific support methods.
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#
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def user_exists(cursor, user):
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# The PUBLIC user is a special case that is always there
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if user == 'PUBLIC':
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return True
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query = "SELECT rolname FROM pg_roles WHERE rolname=%(user)s"
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cursor.execute(query, {'user': user})
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return cursor.rowcount > 0
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def user_add(cursor, user, password, role_attr_flags, encrypted, expires):
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"""Create a new database user (role)."""
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# Note: role_attr_flags escaped by parse_role_attrs and encrypted is a literal
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query_password_data = dict(password=password, expires=expires)
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query = ['CREATE USER %(user)s' % { "user": pg_quote_identifier(user, 'role')}]
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if password is not None:
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query.append("WITH %(crypt)s" % { "crypt": encrypted })
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query.append("PASSWORD %(password)s")
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if expires is not None:
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query.append("VALID UNTIL %(expires)s")
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query.append(role_attr_flags)
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query = ' '.join(query)
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cursor.execute(query, query_password_data)
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return True
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def user_alter(cursor, module, user, password, role_attr_flags, encrypted, expires, no_password_changes):
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"""Change user password and/or attributes. Return True if changed, False otherwise."""
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changed = False
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# Note: role_attr_flags escaped by parse_role_attrs and encrypted is a literal
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if user == 'PUBLIC':
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if password is not None:
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module.fail_json(msg="cannot change the password for PUBLIC user")
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elif role_attr_flags != '':
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module.fail_json(msg="cannot change the role_attr_flags for PUBLIC user")
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else:
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return False
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# Handle passwords.
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if not no_password_changes and (password is not None or role_attr_flags != ''):
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# Select password and all flag-like columns in order to verify changes.
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query_password_data = dict(password=password, expires=expires)
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select = "SELECT * FROM pg_authid where rolname=%(user)s"
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cursor.execute(select, {"user": user})
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# Grab current role attributes.
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current_role_attrs = cursor.fetchone()
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# Do we actually need to do anything?
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pwchanging = False
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if password is not None:
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if encrypted:
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if password.startswith('md5'):
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if password != current_role_attrs['rolpassword']:
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pwchanging = True
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else:
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try:
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from passlib.hash import postgres_md5 as pm
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if pm.encrypt(password, user) != current_role_attrs['rolpassword']:
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pwchanging = True
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except ImportError:
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# Cannot check if passlib is not installed, so assume password is different
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pwchanging = True
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else:
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if password != current_role_attrs['rolpassword']:
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pwchanging = True
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role_attr_flags_changing = False
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if role_attr_flags:
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role_attr_flags_dict = {}
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for r in role_attr_flags.split(' '):
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if r.startswith('NO'):
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role_attr_flags_dict[r.replace('NO', '', 1)] = False
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else:
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role_attr_flags_dict[r] = True
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for role_attr_name, role_attr_value in role_attr_flags_dict.items():
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if current_role_attrs[PRIV_TO_AUTHID_COLUMN[role_attr_name]] != role_attr_value:
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role_attr_flags_changing = True
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expires_changing = (expires is not None and expires == current_roles_attrs['rol_valid_until'])
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if not pwchanging and not role_attr_flags_changing and not expires_changing:
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return False
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alter = ['ALTER USER %(user)s' % {"user": pg_quote_identifier(user, 'role')}]
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if pwchanging:
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alter.append("WITH %(crypt)s" % {"crypt": encrypted})
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alter.append("PASSWORD %(password)s")
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alter.append(role_attr_flags)
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elif role_attr_flags:
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alter.append('WITH %s' % role_attr_flags)
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if expires is not None:
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alter.append("VALID UNTIL %(expires)s")
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try:
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cursor.execute(' '.join(alter), query_password_data)
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except psycopg2.InternalError:
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e = get_exception()
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if e.pgcode == '25006':
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# Handle errors due to read-only transactions indicated by pgcode 25006
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# ERROR: cannot execute ALTER ROLE in a read-only transaction
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changed = False
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module.fail_json(msg=e.pgerror)
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return changed
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else:
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raise psycopg2.InternalError(e)
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# Grab new role attributes.
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cursor.execute(select, {"user": user})
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new_role_attrs = cursor.fetchone()
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# Detect any differences between current_ and new_role_attrs.
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for i in range(len(current_role_attrs)):
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if current_role_attrs[i] != new_role_attrs[i]:
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changed = True
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return changed
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def user_delete(cursor, user):
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"""Try to remove a user. Returns True if successful otherwise False"""
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cursor.execute("SAVEPOINT ansible_pgsql_user_delete")
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try:
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cursor.execute("DROP USER %s" % pg_quote_identifier(user, 'role'))
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except:
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cursor.execute("ROLLBACK TO SAVEPOINT ansible_pgsql_user_delete")
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cursor.execute("RELEASE SAVEPOINT ansible_pgsql_user_delete")
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return False
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cursor.execute("RELEASE SAVEPOINT ansible_pgsql_user_delete")
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return True
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def has_table_privileges(cursor, user, table, privs):
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"""
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Return the difference between the privileges that a user already has and
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the privileges that they desire to have.
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:returns: tuple of:
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* privileges that they have and were requested
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* privileges they currently hold but were not requested
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* privileges requested that they do not hold
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"""
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cur_privs = get_table_privileges(cursor, user, table)
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have_currently = cur_privs.intersection(privs)
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other_current = cur_privs.difference(privs)
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desired = privs.difference(cur_privs)
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return (have_currently, other_current, desired)
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def get_table_privileges(cursor, user, table):
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if '.' in table:
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schema, table = table.split('.', 1)
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else:
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schema = 'public'
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query = '''SELECT privilege_type FROM information_schema.role_table_grants
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WHERE grantee=%s AND table_name=%s AND table_schema=%s'''
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cursor.execute(query, (user, table, schema))
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return frozenset([x[0] for x in cursor.fetchall()])
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def grant_table_privileges(cursor, user, table, privs):
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# Note: priv escaped by parse_privs
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privs = ', '.join(privs)
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query = 'GRANT %s ON TABLE %s TO %s' % (
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privs, pg_quote_identifier(table, 'table'), pg_quote_identifier(user, 'role') )
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cursor.execute(query)
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def revoke_table_privileges(cursor, user, table, privs):
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# Note: priv escaped by parse_privs
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privs = ', '.join(privs)
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query = 'REVOKE %s ON TABLE %s FROM %s' % (
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privs, pg_quote_identifier(table, 'table'), pg_quote_identifier(user, 'role') )
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cursor.execute(query)
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def get_database_privileges(cursor, user, db):
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priv_map = {
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'C':'CREATE',
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'T':'TEMPORARY',
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'c':'CONNECT',
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}
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query = 'SELECT datacl FROM pg_database WHERE datname = %s'
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cursor.execute(query, (db,))
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datacl = cursor.fetchone()[0]
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if datacl is None:
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return set()
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r = re.search('%s=(C?T?c?)/[a-z]+\,?' % user, datacl)
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if r is None:
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return set()
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o = set()
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for v in r.group(1):
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o.add(priv_map[v])
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return normalize_privileges(o, 'database')
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def has_database_privileges(cursor, user, db, privs):
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"""
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Return the difference between the privileges that a user already has and
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the privileges that they desire to have.
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:returns: tuple of:
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* privileges that they have and were requested
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* privileges they currently hold but were not requested
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* privileges requested that they do not hold
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"""
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cur_privs = get_database_privileges(cursor, user, db)
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have_currently = cur_privs.intersection(privs)
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other_current = cur_privs.difference(privs)
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desired = privs.difference(cur_privs)
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return (have_currently, other_current, desired)
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def grant_database_privileges(cursor, user, db, privs):
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# Note: priv escaped by parse_privs
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privs =', '.join(privs)
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if user == "PUBLIC":
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query = 'GRANT %s ON DATABASE %s TO PUBLIC' % (
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privs, pg_quote_identifier(db, 'database'))
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else:
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query = 'GRANT %s ON DATABASE %s TO %s' % (
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privs, pg_quote_identifier(db, 'database'),
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pg_quote_identifier(user, 'role'))
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cursor.execute(query)
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def revoke_database_privileges(cursor, user, db, privs):
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# Note: priv escaped by parse_privs
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privs = ', '.join(privs)
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if user == "PUBLIC":
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query = 'REVOKE %s ON DATABASE %s FROM PUBLIC' % (
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privs, pg_quote_identifier(db, 'database'))
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else:
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query = 'REVOKE %s ON DATABASE %s FROM %s' % (
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privs, pg_quote_identifier(db, 'database'),
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pg_quote_identifier(user, 'role'))
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cursor.execute(query)
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def revoke_privileges(cursor, user, privs):
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if privs is None:
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return False
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revoke_funcs = dict(table=revoke_table_privileges, database=revoke_database_privileges)
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check_funcs = dict(table=has_table_privileges, database=has_database_privileges)
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changed = False
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for type_ in privs:
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for name, privileges in iteritems(privs[type_]):
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# Check that any of the privileges requested to be removed are
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# currently granted to the user
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differences = check_funcs[type_](cursor, user, name, privileges)
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if differences[0]:
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revoke_funcs[type_](cursor, user, name, privileges)
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changed = True
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return changed
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def grant_privileges(cursor, user, privs):
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if privs is None:
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return False
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grant_funcs = dict(table=grant_table_privileges, database=grant_database_privileges)
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check_funcs = dict(table=has_table_privileges, database=has_database_privileges)
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changed = False
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for type_ in privs:
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for name, privileges in iteritems(privs[type_]):
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# Check that any of the privileges requested for the user are
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# currently missing
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differences = check_funcs[type_](cursor, user, name, privileges)
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if differences[2]:
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grant_funcs[type_](cursor, user, name, privileges)
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changed = True
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return changed
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def parse_role_attrs(role_attr_flags):
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"""
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Parse role attributes string for user creation.
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Format:
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attributes[,attributes,...]
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Where:
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attributes := CREATEDB,CREATEROLE,NOSUPERUSER,...
|
|
[ "[NO]SUPERUSER","[NO]CREATEROLE", "[NO]CREATEUSER", "[NO]CREATEDB",
|
|
"[NO]INHERIT", "[NO]LOGIN", "[NO]REPLICATION" ]
|
|
|
|
"""
|
|
if ',' in role_attr_flags:
|
|
flag_set = frozenset(r.upper() for r in role_attr_flags.split(","))
|
|
elif role_attr_flags:
|
|
flag_set = frozenset((role_attr_flags.upper(),))
|
|
else:
|
|
flag_set = frozenset()
|
|
if not flag_set.issubset(VALID_FLAGS):
|
|
raise InvalidFlagsError('Invalid role_attr_flags specified: %s' %
|
|
' '.join(flag_set.difference(VALID_FLAGS)))
|
|
o_flags = ' '.join(flag_set)
|
|
return o_flags
|
|
|
|
def normalize_privileges(privs, type_):
|
|
new_privs = set(privs)
|
|
if 'ALL' in new_privs:
|
|
new_privs.update(VALID_PRIVS[type_])
|
|
new_privs.remove('ALL')
|
|
if 'TEMP' in new_privs:
|
|
new_privs.add('TEMPORARY')
|
|
new_privs.remove('TEMP')
|
|
|
|
return new_privs
|
|
|
|
def parse_privs(privs, db):
|
|
"""
|
|
Parse privilege string to determine permissions for database db.
|
|
Format:
|
|
|
|
privileges[/privileges/...]
|
|
|
|
Where:
|
|
|
|
privileges := DATABASE_PRIVILEGES[,DATABASE_PRIVILEGES,...] |
|
|
TABLE_NAME:TABLE_PRIVILEGES[,TABLE_PRIVILEGES,...]
|
|
"""
|
|
if privs is None:
|
|
return privs
|
|
|
|
o_privs = {
|
|
'database':{},
|
|
'table':{}
|
|
}
|
|
for token in privs.split('/'):
|
|
if ':' not in token:
|
|
type_ = 'database'
|
|
name = db
|
|
priv_set = frozenset(x.strip().upper() for x in token.split(',') if x.strip())
|
|
else:
|
|
type_ = 'table'
|
|
name, privileges = token.split(':', 1)
|
|
priv_set = frozenset(x.strip().upper() for x in privileges.split(',') if x.strip())
|
|
|
|
if not priv_set.issubset(VALID_PRIVS[type_]):
|
|
raise InvalidPrivsError('Invalid privs specified for %s: %s' %
|
|
(type_, ' '.join(priv_set.difference(VALID_PRIVS[type_]))))
|
|
|
|
priv_set = normalize_privileges(priv_set, type_)
|
|
o_privs[type_][name] = priv_set
|
|
|
|
return o_privs
|
|
|
|
# ===========================================
|
|
# Module execution.
|
|
#
|
|
|
|
def main():
|
|
module = AnsibleModule(
|
|
argument_spec=dict(
|
|
login_user=dict(default="postgres"),
|
|
login_password=dict(default=""),
|
|
login_host=dict(default=""),
|
|
login_unix_socket=dict(default=""),
|
|
user=dict(required=True, aliases=['name']),
|
|
password=dict(default=None),
|
|
state=dict(default="present", choices=["absent", "present"]),
|
|
priv=dict(default=None),
|
|
db=dict(default=''),
|
|
port=dict(default='5432'),
|
|
fail_on_user=dict(type='bool', default='yes'),
|
|
role_attr_flags=dict(default=''),
|
|
encrypted=dict(type='bool', default='no'),
|
|
no_password_changes=dict(type='bool', default='no'),
|
|
expires=dict(default=None)
|
|
),
|
|
supports_check_mode = True
|
|
)
|
|
|
|
user = module.params["user"]
|
|
password = module.params["password"]
|
|
state = module.params["state"]
|
|
fail_on_user = module.params["fail_on_user"]
|
|
db = module.params["db"]
|
|
if db == '' and module.params["priv"] is not None:
|
|
module.fail_json(msg="privileges require a database to be specified")
|
|
privs = parse_privs(module.params["priv"], db)
|
|
port = module.params["port"]
|
|
no_password_changes = module.params["no_password_changes"]
|
|
try:
|
|
role_attr_flags = parse_role_attrs(module.params["role_attr_flags"])
|
|
except InvalidFlagsError:
|
|
e = get_exception()
|
|
module.fail_json(msg=str(e))
|
|
if module.params["encrypted"]:
|
|
encrypted = "ENCRYPTED"
|
|
else:
|
|
encrypted = "UNENCRYPTED"
|
|
expires = module.params["expires"]
|
|
|
|
if not postgresqldb_found:
|
|
module.fail_json(msg="the python psycopg2 module is required")
|
|
|
|
# To use defaults values, keyword arguments must be absent, so
|
|
# check which values are empty and don't include in the **kw
|
|
# dictionary
|
|
params_map = {
|
|
"login_host":"host",
|
|
"login_user":"user",
|
|
"login_password":"password",
|
|
"port":"port",
|
|
"db":"database"
|
|
}
|
|
kw = dict( (params_map[k], v) for (k, v) in iteritems(module.params)
|
|
if k in params_map and v != "" )
|
|
|
|
# If a login_unix_socket is specified, incorporate it here.
|
|
is_localhost = "host" not in kw or kw["host"] == "" or kw["host"] == "localhost"
|
|
if is_localhost and module.params["login_unix_socket"] != "":
|
|
kw["host"] = module.params["login_unix_socket"]
|
|
|
|
try:
|
|
db_connection = psycopg2.connect(**kw)
|
|
cursor = db_connection.cursor(cursor_factory=psycopg2.extras.DictCursor)
|
|
except Exception:
|
|
e = get_exception()
|
|
module.fail_json(msg="unable to connect to database: %s" % e)
|
|
|
|
kw = dict(user=user)
|
|
changed = False
|
|
user_removed = False
|
|
|
|
if state == "present":
|
|
if user_exists(cursor, user):
|
|
try:
|
|
changed = user_alter(cursor, module, user, password, role_attr_flags, encrypted, expires, no_password_changes)
|
|
except SQLParseError:
|
|
e = get_exception()
|
|
module.fail_json(msg=str(e))
|
|
else:
|
|
try:
|
|
changed = user_add(cursor, user, password, role_attr_flags, encrypted, expires)
|
|
except SQLParseError:
|
|
e = get_exception()
|
|
module.fail_json(msg=str(e))
|
|
try:
|
|
changed = grant_privileges(cursor, user, privs) or changed
|
|
except SQLParseError:
|
|
e = get_exception()
|
|
module.fail_json(msg=str(e))
|
|
else:
|
|
if user_exists(cursor, user):
|
|
if module.check_mode:
|
|
changed = True
|
|
kw['user_removed'] = True
|
|
else:
|
|
try:
|
|
changed = revoke_privileges(cursor, user, privs)
|
|
user_removed = user_delete(cursor, user)
|
|
except SQLParseError:
|
|
e = get_exception()
|
|
module.fail_json(msg=str(e))
|
|
changed = changed or user_removed
|
|
if fail_on_user and not user_removed:
|
|
msg = "unable to remove user"
|
|
module.fail_json(msg=msg)
|
|
kw['user_removed'] = user_removed
|
|
|
|
if changed:
|
|
if module.check_mode:
|
|
db_connection.rollback()
|
|
else:
|
|
db_connection.commit()
|
|
|
|
kw['changed'] = changed
|
|
module.exit_json(**kw)
|
|
|
|
# import module snippets
|
|
from ansible.module_utils.basic import *
|
|
from ansible.module_utils.database import *
|
|
main()
|