292 lines
9.4 KiB
Python
Executable file
292 lines
9.4 KiB
Python
Executable file
#!/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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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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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):
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"""Create a new user with write access to the database"""
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query = "CREATE USER %(user)s with PASSWORD '%(password)s'"
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cursor.execute(query % {"user": user, "password": password})
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return True
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def user_chpass(cursor, user, password):
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"""Change user password"""
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changed = False
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# Handle passwords.
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if password is not None:
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select = "SELECT rolpassword FROM pg_authid where rolname=%(user)s"
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cursor.execute(select, {"user": user})
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current_pass_hash = cursor.fetchone()[0]
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# Not sure how to hash the new password, so we just initiate the
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# change and check if the hash changed
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alter = "ALTER USER %(user)s WITH PASSWORD '%(password)s'"
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cursor.execute(alter % {"user": user, "password": password})
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cursor.execute(select, {"user": user})
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new_pass_hash = cursor.fetchone()[0]
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if current_pass_hash != new_pass_hash:
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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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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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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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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_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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)
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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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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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changed = user_chpass(cursor, user, password)
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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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changed = user_add(cursor, user, password)
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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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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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