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#!/usr/bin/python
# -*- coding: utf-8 -*-
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
import re
try:
import psycopg2
except ImportError:
postgresqldb_found = False
else:
postgresqldb_found = True
# ===========================================
# PostgreSQL module specific support methods.
#
def user_exists(cursor, user):
query = "SELECT rolname FROM pg_roles WHERE rolname=%(user)s"
cursor.execute(query, {'user': user})
return cursor.rowcount > 0
def user_add(cursor, user, password):
"""Create a new user with write access to the database"""
query = "CREATE USER %(user)s with PASSWORD '%(password)s'"
cursor.execute(query % {"user": user, "password": password})
return True
def user_chpass(cursor, user, password):
"""Change user password"""
changed = False
# Handle passwords.
if password is not None:
select = "SELECT rolpassword FROM pg_authid where rolname=%(user)s"
cursor.execute(select, {"user": user})
current_pass_hash = cursor.fetchone()[0]
# Not sure how to hash the new password, so we just initiate the
# change and check if the hash changed
alter = "ALTER USER %(user)s WITH PASSWORD '%(password)s'"
cursor.execute(alter % {"user": user, "password": password})
cursor.execute(select, {"user": user})
new_pass_hash = cursor.fetchone()[0]
if current_pass_hash != new_pass_hash:
changed = True
return changed
def user_delete(cursor, user):
"""Try to remove a user. Returns True if successful otherwise False"""
cursor.execute("SAVEPOINT ansible_pgsql_user_delete")
try:
cursor.execute("DROP USER %s" % user)
except:
cursor.execute("ROLLBACK TO SAVEPOINT ansible_pgsql_user_delete")
cursor.execute("RELEASE SAVEPOINT ansible_pgsql_user_delete")
return False
cursor.execute("RELEASE SAVEPOINT ansible_pgsql_user_delete")
return True
def has_table_privilege(cursor, user, table, priv):
query = 'SELECT has_table_privilege(%s, %s, %s)'
cursor.execute(query, (user, table, priv))
return cursor.fetchone()[0]
def get_table_privileges(cursor, user, table):
if '.' in table:
schema, table = table.split('.', 1)
else:
schema = 'public'
query = '''SELECT privilege_type FROM information_schema.role_table_grants
WHERE grantee=%s AND table_name=%s AND table_schema=%s'''
cursor.execute(query, (user, table, schema))
return set([x[0] for x in cursor.fetchall()])
def grant_table_privilege(cursor, user, table, priv):
prev_priv = get_table_privileges(cursor, user, table)
query = 'GRANT %s ON TABLE %s TO %s' % (priv, table, user)
cursor.execute(query)
curr_priv = get_table_privileges(cursor, user, table)
return len(curr_priv) > len(prev_priv)
def revoke_table_privilege(cursor, user, table, priv):
prev_priv = get_table_privileges(cursor, user, table)
query = 'REVOKE %s ON TABLE %s FROM %s' % (priv, table, user)
cursor.execute(query)
curr_priv = get_table_privileges(cursor, user, table)
return len(curr_priv) < len(prev_priv)
def get_database_privileges(cursor, user, db):
priv_map = {
'C':'CREATE',
'T':'TEMPORARY',
'c':'CONNECT',
}
query = 'SELECT datacl FROM pg_database WHERE datname = %s'
cursor.execute(query, (db,))
datacl = cursor.fetchone()[0]
r = re.search('%s=(C?T?c?)/[a-z]+\,?' % user, datacl)
if r is None:
return []
o = []
for v in r.group(1):
o.append(priv_map[v])
return o
def has_database_privilege(cursor, user, db, priv):
query = 'SELECT has_database_privilege(%s, %s, %s)'
cursor.execute(query, (user, db, priv))
return cursor.fetchone()[0]
def grant_database_privilege(cursor, user, db, priv):
prev_priv = get_database_privileges(cursor, user, db)
query = 'GRANT %s ON DATABASE %s TO %s' % (priv, db, user)
cursor.execute(query)
curr_priv = get_database_privileges(cursor, user, db)
return len(curr_priv) > len(prev_priv)
def revoke_database_privilege(cursor, user, db, priv):
prev_priv = get_database_privileges(cursor, user, db)
query = 'REVOKE %s ON DATABASE %s FROM %s' % (priv, db, user)
cursor.execute(query)
curr_priv = get_database_privileges(cursor, user, db)
return len(curr_priv) < len(prev_priv)
def revoke_privileges(cursor, user, privs):
if privs is None:
return False
changed = False
for type_ in privs:
revoke_func = {
'table':revoke_table_privilege,
'database':revoke_database_privilege
}[type_]
for name, privileges in privs[type_].iteritems():
for privilege in privileges:
changed = revoke_func(cursor, user, name, privilege)\
or changed
return changed
def grant_privileges(cursor, user, privs):
if privs is None:
return False
changed = False
for type_ in privs:
grant_func = {
'table':grant_table_privilege,
'database':grant_database_privilege
}[type_]
for name, privileges in privs[type_].iteritems():
for privilege in privileges:
changed = grant_func(cursor, user, name, privilege)\
or changed
return changed
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 = set(x.strip() for x in token.split(','))
else:
type_ = 'table'
name, privileges = token.split(':', 1)
priv_set = set(x.strip() for x in privileges.split(','))
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=""),
user=dict(required=True, aliases=['name']),
password=dict(default=None),
state=dict(default="present", choices=["absent", "present"]),
priv=dict(default=None),
db=dict(default=''),
fail_on_user=dict(default='yes')
)
)
user = module.params["user"]
password = module.params["password"]
state = module.params["state"]
fail_on_user = module.params["fail_on_user"] == 'yes'
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)
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",
"db":"database"
}
kw = dict( (params_map[k], v) for (k, v) in module.params.iteritems()
if k in params_map and v != "" )
try:
db_connection = psycopg2.connect(**kw)
cursor = db_connection.cursor()
except Exception, e:
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):
changed = user_chpass(cursor, user, password)
else:
if password is None:
msg = "password parameter required when adding a user"
module.fail_json(msg=msg)
changed = user_add(cursor, user, password)
changed = grant_privileges(cursor, user, privs) or changed
else:
if user_exists(cursor, user):
changed = revoke_privileges(cursor, user, privs)
user_removed = user_delete(cursor, user)
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:
db_connection.commit()
kw['changed'] = changed
module.exit_json(**kw)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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