465 lines
16 KiB
Python
465 lines
16 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
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required: true
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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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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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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: null
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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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examples:
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- code: "postgresql_user: db=acme user=django password=ceec4eif7ya priv=CONNECT/products:ALL"
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description: Create django user and grant access to database and products table
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- code: "postgresql_user: user=rails password=secret role_attr_flags=CREATEDB,NOSUPERUSER"
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description: Create rails user, grant privilege to create other databases and demote rails from super user status
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- code: "postgresql_user: db=acme user=test priv=ALL/products:ALL state=absent fail_on_user=no"
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description: Remove test user privileges from acme
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- code: "postgresql_user: db=test user=test priv=ALL state=absent"
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description: Remove test user from test database and the cluster
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- code: INSERT,UPDATE/table:SELECT/anothertable:ALL
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description: Example privileges string format
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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 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: Lorin Hochstein
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'''
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import re
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try:
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import psycopg2
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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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# ===========================================
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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):
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"""Create a new database user (role)."""
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query = 'CREATE USER "%(user)s" WITH PASSWORD %%(password)s %(role_attr_flags)s' % {
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"user": user, "role_attr_flags": role_attr_flags
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}
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cursor.execute(query, {"password": password})
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return True
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def user_alter(cursor, user, password, role_attr_flags):
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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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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 password is not None or role_attr_flags is not None:
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# Select password and all flag-like columns in order to verify changes.
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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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if password is not None:
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# Update the role attributes, including password.
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alter = 'ALTER USER "%(user)s" WITH PASSWORD %%(password)s %(role_attr_flags)s' % {
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"user": user, "role_attr_flags": role_attr_flags
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}
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cursor.execute(alter, {"password": password})
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else:
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# Update the role attributes, excluding password.
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alter = "ALTER USER \"%(user)s\" WITH %(role_attr_flags)s"
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cursor.execute(alter % {"user": user, "role_attr_flags": role_attr_flags})
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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\"" % user)
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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_privilege(cursor, user, table, priv):
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query = 'SELECT has_table_privilege(%s, %s, %s)'
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cursor.execute(query, (user, table, priv))
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return cursor.fetchone()[0]
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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 set([x[0] for x in cursor.fetchall()])
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def grant_table_privilege(cursor, user, table, priv):
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prev_priv = get_table_privileges(cursor, user, table)
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query = 'GRANT %s ON TABLE \"%s\" TO \"%s\"' % (priv, table, user)
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cursor.execute(query)
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curr_priv = get_table_privileges(cursor, user, table)
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return len(curr_priv) > len(prev_priv)
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def revoke_table_privilege(cursor, user, table, priv):
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prev_priv = get_table_privileges(cursor, user, table)
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query = 'REVOKE %s ON TABLE \"%s\" FROM \"%s\"' % (priv, table, user)
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cursor.execute(query)
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curr_priv = get_table_privileges(cursor, user, table)
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return len(curr_priv) < len(prev_priv)
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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 []
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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 []
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o = []
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for v in r.group(1):
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o.append(priv_map[v])
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return o
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def has_database_privilege(cursor, user, db, priv):
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query = 'SELECT has_database_privilege(%s, %s, %s)'
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cursor.execute(query, (user, db, priv))
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return cursor.fetchone()[0]
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def grant_database_privilege(cursor, user, db, priv):
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prev_priv = get_database_privileges(cursor, user, db)
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if user == "PUBLIC":
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query = 'GRANT %s ON DATABASE \"%s\" TO PUBLIC' % (priv, db)
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else:
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query = 'GRANT %s ON DATABASE \"%s\" TO \"%s\"' % (priv, db, user)
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cursor.execute(query)
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curr_priv = get_database_privileges(cursor, user, db)
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return len(curr_priv) > len(prev_priv)
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def revoke_database_privilege(cursor, user, db, priv):
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prev_priv = get_database_privileges(cursor, user, db)
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if user == "PUBLIC":
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query = 'REVOKE %s ON DATABASE \"%s\" FROM PUBLIC' % (priv, db)
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else:
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query = 'REVOKE %s ON DATABASE \"%s\" FROM \"%s\"' % (priv, db, user)
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cursor.execute(query)
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curr_priv = get_database_privileges(cursor, user, db)
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return len(curr_priv) < len(prev_priv)
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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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changed = False
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for type_ in privs:
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revoke_func = {
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'table':revoke_table_privilege,
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'database':revoke_database_privilege
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}[type_]
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for name, privileges in privs[type_].iteritems():
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for privilege in privileges:
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changed = revoke_func(cursor, user, name, privilege)\
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or changed
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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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changed = False
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for type_ in privs:
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grant_func = {
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'table':grant_table_privilege,
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'database':grant_database_privilege
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}[type_]
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for name, privileges in privs[type_].iteritems():
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for privilege in privileges:
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changed = grant_func(cursor, user, name, privilege)\
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or changed
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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,...
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"""
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if ',' not in role_attr_flags:
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return role_attr_flags
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flag_set = role_attr_flags.split(",")
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o_flags = " ".join(flag_set)
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return o_flags
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def parse_privs(privs, db):
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"""
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Parse privilege string to determine permissions for database db.
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Format:
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privileges[/privileges/...]
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Where:
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privileges := DATABASE_PRIVILEGES[,DATABASE_PRIVILEGES,...] |
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TABLE_NAME:TABLE_PRIVILEGES[,TABLE_PRIVILEGES,...]
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"""
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if privs is None:
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return privs
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o_privs = {
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'database':{},
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'table':{}
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}
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for token in privs.split('/'):
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if ':' not in token:
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type_ = 'database'
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name = db
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priv_set = set(x.strip() for x in token.split(','))
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else:
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type_ = 'table'
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name, privileges = token.split(':', 1)
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priv_set = set(x.strip() for x in privileges.split(','))
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o_privs[type_][name] = priv_set
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return o_privs
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# ===========================================
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# Module execution.
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#
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def main():
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module = AnsibleModule(
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argument_spec=dict(
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login_user=dict(default="postgres"),
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login_password=dict(default=""),
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login_host=dict(default=""),
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user=dict(required=True, aliases=['name']),
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password=dict(default=None),
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state=dict(default="present", choices=["absent", "present"]),
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priv=dict(default=None),
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db=dict(default=''),
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port=dict(default='5432'),
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fail_on_user=dict(default='yes'),
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role_attr_flags=dict(default='')
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),
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supports_check_mode = True
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)
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user = module.params["user"]
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password = module.params["password"]
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state = module.params["state"]
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fail_on_user = module.params["fail_on_user"] == 'yes'
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db = module.params["db"]
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if db == '' and module.params["priv"] is not None:
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module.fail_json(msg="privileges require a database to be specified")
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privs = parse_privs(module.params["priv"], db)
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port = module.params["port"]
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role_attr_flags = parse_role_attrs(module.params["role_attr_flags"])
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if not postgresqldb_found:
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module.fail_json(msg="the python psycopg2 module is required")
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# To use defaults values, keyword arguments must be absent, so
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# check which values are empty and don't include in the **kw
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# dictionary
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params_map = {
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"login_host":"host",
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"login_user":"user",
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"login_password":"password",
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"port":"port",
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"db":"database"
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}
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kw = dict( (params_map[k], v) for (k, v) in module.params.iteritems()
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if k in params_map and v != "" )
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try:
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db_connection = psycopg2.connect(**kw)
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cursor = db_connection.cursor()
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except Exception, e:
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module.fail_json(msg="unable to connect to database: %s" % e)
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kw = dict(user=user)
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changed = False
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user_removed = False
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if state == "present":
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if user_exists(cursor, user):
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if module.check_mode:
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kw['changed'] = True
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module.exit_json(**kw)
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changed = user_alter(cursor, user, password, role_attr_flags)
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else:
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if password is None:
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msg = "password parameter required when adding a user"
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module.fail_json(msg=msg)
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if module.check_mode:
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kw['changed'] = True
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module.exit_json(**kw)
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changed = user_add(cursor, user, password, role_attr_flags)
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changed = grant_privileges(cursor, user, privs) or changed
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else:
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if user_exists(cursor, user):
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if module.check_mode:
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kw['changed'] = True
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kw['user_removed'] = True
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module.exit_json(**kw)
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changed = revoke_privileges(cursor, user, privs)
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user_removed = user_delete(cursor, user)
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changed = changed or user_removed
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if fail_on_user and not user_removed:
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msg = "unable to remove user"
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module.fail_json(msg=msg)
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kw['user_removed'] = user_removed
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if changed:
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db_connection.commit()
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kw['changed'] = changed
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module.exit_json(**kw)
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# this is magic, see lib/ansible/module_common.py
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#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
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main()
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