Initial commit of change of semantics for module
The postgresql_user module has several drawbacks: * No granularity for privileges * PostgreSQL semantics force working on one database at time, at least for Tables. Which means that a single call can't remove all the privileges for a user, and a user can't be removed until all the privileges are removed, forcing a module failure with no way to work around the issue. Changes: * Added the ability to specify granular privileges for database and tables within the database * Report if user was removed, and add an option to disable failing if user is not removed.
This commit is contained in:
Pepe Barbe
parent
a32ae49bb6
commit
384839bfe1
1 changed files with 143 additions and 48 deletions
191
postgresql_user
191
postgresql_user
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@ -34,35 +34,14 @@ def user_exists(cursor, user):
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return cursor.rowcount > 0
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def user_add(cursor, user, password, db):
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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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grant_privileges(cursor, user, db)
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return True
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def has_privileges(cursor, user, db):
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"""Check if the user has create privileges on the database"""
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query = "SELECT has_database_privilege(%(user)s, %(db)s, 'CREATE')"
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cursor.execute(query, {'user': user, 'db': db})
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return cursor.fetchone()[0]
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def grant_privileges(cursor, user, db):
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"""Grant all privileges on the database"""
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query = "GRANT ALL PRIVILEGES ON DATABASE %(db)s TO %(user)s"
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cursor.execute(query % {'user': user, 'db': db})
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def revoke_privileges(cursor, user, db):
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"""Revoke all privileges on the database"""
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query = "REVOKE ALL PRIVILEGES ON DATABASE %(db)s FROM %(user)s"
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cursor.execute(query % {'user': user, 'db': db})
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def user_mod(cursor, user, password, db):
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"""Update password and permissions"""
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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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@ -79,28 +58,131 @@ def user_mod(cursor, user, password, db):
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if current_pass_hash != new_pass_hash:
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changed = True
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# Handle privileges.
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# For now, we just check if the user has access to the database
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if not has_privileges(cursor, user, db):
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grant_privileges(cursor, user, db)
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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 user_delete(cursor, user, db):
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"""Delete a user, first revoking privileges"""
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revoke_privileges(cursor, user, db)
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cursor.execute("DROP USER %(user)s" % {'user': user})
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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 grant_table_privilege(cursor, user, table, priv):
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if has_table_privilege(cursor, user, table, priv):
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return False
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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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return True
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def revoke_table_privilege(cursor, user, table, priv):
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if not has_table_privilege(cursor, user, table, priv):
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return False
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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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return True
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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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if has_database_privilege(cursor, user, db, priv):
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return False
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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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return True
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def revoke_database_privilege(cursor, user, db, priv):
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if not has_database_privilege(cursor, user, db, priv):
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return False
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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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return True
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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_].iteritem():
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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_].iteritem():
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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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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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privileges = token
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else:
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type_ = 'table'
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name, privileges = token.split(':', 1)
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privileges = privileges.split(',')
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privs[type_][name] = privileges
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return 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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@ -110,13 +192,19 @@ def main():
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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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db=dict(required=True),
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priv=dict(default=None),
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db=dict(default=''),
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fail_on_user=dict(default=True)
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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"]
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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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if not postgresqldb_found:
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module.fail_json(msg="the python psycopg2 module is required")
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@ -127,7 +215,8 @@ def main():
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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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"login_password":"password",
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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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@ -136,24 +225,30 @@ def main():
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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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changed = False
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if state == "present":
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if user_exists(cursor, user):
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changed = user_mod(cursor, user, password, db)
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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, db)
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elif state == "absent":
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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 = user_delete(cursor, user, db)
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else:
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changed = False
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# Commit the database changes
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db_connection.commit()
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module.exit_json(changed=changed, user=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 = "unabel to remove user"
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module.fail_json(msg=msg)
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if changed:
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db_connection.commit()
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module.exit_json(changed=changed, user=user, user_removed=user_removed)
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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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