add delete_db for testing

README.md

@@ -1,7 +1,3 @@
-### TODO before merge
-- testing and tests
-- need someone to test isolation of PostgreSQL users
-
 # pyceo
 [![Build Status](https://ci.csclub.uwaterloo.ca/api/badges/public/pyceo/status.svg?ref=refs/heads/v1)](https://ci.csclub.uwaterloo.ca/public/pyceo)
 
@@ -37,37 +33,37 @@ On phosphoric-acid, you will additionally need to create a principal
 called `ceod/admin` (remember to addprinc **and** ktadd).
 
 #### Database
-Edit the `/etc/csc/ceod.ini` with the credentials required to access MySQL and PostgreSQL
+create superuser `mysql` with password `mysql`
 ```
-[mysql]
-host = 
-username = 
-password = 
+mysql -u root
 
-[postgresql]
-host = 
-usrename = 
-password = 
+CREATE USER 'mysql'@'localhost' IDENTIFIED BY 'mysql';
+GRANT ALL PRIVILEGES ON *.* TO 'mysql'@'localhost' WITH GRANT OPTION;
 ```
-#### PostgreSQL Database
-PostgreSQL is not designed for isolation of users and by default will allow any user to connect and edit any database. To disallow users to create public schema we run
+modify superuser `postgres` for password authentication and restrict new users
 ```
 su postgres
 psql
 
+ALTER USER postgres WITH PASSWORD 'postgres';
 REVOKE ALL ON SCHEMA public FROM public;
 GRANT ALL ON SCHEMA public TO postgres;
 ```
-We also want to change `pg_hba.conf` to only allow local connections and force the requested database to have the same name as the user creating the connection ([more info](https://www.postgresql.org/docs/9.1/auth-pg-hba-conf.html))
+create a new `pg_hba.conf` to force password authentication and reject non local
+```
+cd /etc/postgres/<version>/<branch>/
+mv pg_hba.conf pg_hba.conf.old
+```
 ```
+# new pg_hba.conf
 # TYPE  DATABASE        USER            ADDRESS                 METHOD
-local   all             postgres                                peer
+local   all             postgres                                md5
 local   sameuser        all                                     md5
+host    all             all             0.0.0.0/0               reject
+```
+```
+systemctl restart postgres
 ```
-- peer authentication only requires that your os username matches the postgres username (no password)
-- Users will have access to list of databases and users, and this cannot be disabled without  possible issues ([more info](https://wiki.postgresql.org/wiki/Shared_Database_Hosting#template1))
-- [Managing rights in PostgreSQL](https://wiki.postgresql.org/images/d/d1/Managing_rights_in_postgresql.pdf)
-
 
 #### Dependencies
 Next, install and activate a virtualenv:

ceo_common/interfaces/IDatabaseService.py

@@ -6,9 +6,11 @@ class IDatabaseService(Interface):
     """Interface to create databases for users."""
 
     type = Attribute('the type of databases that will be created')
-    host = Attribute('the database host')
     auth_username = Attribute('username to a privileged user on the database host')
     auth_password = Attribute('password to a privileged user on the database host')
 
     def create_db(username: str) -> str:
         """try to create a database and user and return its password"""
+
+    def delete_db(username: str):
+        """remove user and delete their database"""

ceod/api/database.py

@@ -29,6 +29,24 @@ def create_db_from_type(db_type: str, username: str):
         return {'error': 'Unexpected error'}, 500
 
 
+def delete_db_from_type(db_type: str, username: str):
+    try:
+        if not username.isalnum():  # username should not contain symbols
+            raise UserNotFoundError
+        ldap_srv = component.getUtility(ILDAPService)
+        ldap_srv.get_user(username)  # make sure user exists
+        db_srv = component.getUtility(IDatabaseService, db_type)
+        db_srv.delete_db(username)
+    except UserNotFoundError:
+        return {'error': 'user not found'}, 404
+    except DatabaseConnectionError:
+        return {'error': 'unable to connect or authenticate to sql server'}, 400
+    except DatabasePermissionError:
+        return {'error': 'unable to perform action due to permissions'}, 502
+    except:
+        return {'error': 'Unexpected error'}, 500
+
+
 @bp.route('/mysql/<username>', methods=['POST'])
 @requires_authentication_no_realm
 def create_mysql_db(auth_user: str, username: str):
@@ -37,9 +55,23 @@ def create_mysql_db(auth_user: str, username: str):
     return create_db_from_type('mysql', username)
 
 
+@bp.route('/mysql/<username>', methods=['DELETE'])
+@authz_restrict_to_syscom
+@development_only
+def delete_mysql_db(username: str):
+    delete_db_from_type('mysql', username)
+
+
 @bp.route('/postgresql/<username>', methods=['POST'])
 @requires_authentication_no_realm
 def create_postgresql_db(auth_user: str, username: str):
     if not (auth_user == username or user_is_in_group(auth_user, 'syscom')):
         return {'error': "not authorized to create databases for others"}, 403
     return create_db_from_type('postgresql', username)
+
+
+@bp.route('/postgresql/<username>', methods=['DELETE'])
+@authz_restrict_to_syscom
+@development_only
+def delete_postgresql_db(username: str):
+    delete_db_from_type('postgresl', username)

ceod/db/MySQLService.py

@@ -13,7 +13,6 @@ class MySQLService:
     def __init__(self):
         self.type = 'mysql'
         config = component.getUtility(IConfig)
-        self.host = config.get('mysql_host')
         self.auth_username = config.get('mysql_username')
         self.auth_password = config.get('mysql_password')
 
@@ -22,27 +21,43 @@ class MySQLService:
         search_for_user = f"SELECT user FROM mysql.user WHERE user='{username}'"
         search_for_db = f"SHOW DATABASES LIKE '{username}'"
         create_user = f"CREATE USER '{username}'@'localhost' IDENTIFIED BY %(password)s"
-        reset_password = f"ALTER USER '{username}' IDENTIFIED BY %(password)s"
+        reset_password = f"ALTER USER '{username}'@'localhost' IDENTIFIED BY %(password)s"
         create_database = f"""
         CREATE DATABASE {username};
         GRANT ALL PRIVILEGES ON {username}.* TO '{username}'@'localhost';
         """
         try:
             with connect(
-                host=self.host,
+                host='localhost',
                 user=self.auth_username,
                 password=self.auth_password,
             ) as con:
                 with con.cursor() as cursor:
                     if response_is_empty(search_for_user, con):
-                        cursor.execute(create_user, {password: password})
+                        cursor.execute(create_user, {'password': password})
                     else:
-                        cursor.execute(reset_password, {password: password})
+                        cursor.execute(reset_password, {'password': password})
                     if response_is_empty(search_for_db, con):
                         cursor.execute(create_database)
-                con.commit()
             return password
         except InterfaceError:
             raise DatabaseConnectionError()
         except ProgrammingError:
             raise DatabasePermissionError()
+
+    def delete_db(self, username: str):
+        drop_user = f"DROP USER IF EXISTS '{username}'@'localhost'"
+        drop_db = f"DROP DATABASE IF EXISTS {username}"
+        try:
+            with connect(
+                    host='localhost',
+                    user=self.auth_username,
+                    password=self.auth_password,
+            ) as con:
+                with con.cursor() as cursor:
+                    cursor.execute(drop_user)
+                    cursor.execute(drop_db)
+        except InterfaceError:
+            raise DatabaseConnectionError()
+        except ProgrammingError:
+            raise DatabasePermissionError()

ceod/db/PostgreSQLService.py

@@ -13,7 +13,6 @@ class PostgreSQLService:
     def __init__(self):
         self.type = 'postgresql'
         config = component.getUtility(IConfig)
-        self.host = config.get('postgresql_host')
         self.auth_username = config.get('postgresql_username')
         self.auth_password = config.get('postgresql_password')
 
@@ -29,16 +28,16 @@ class PostgreSQLService:
         """
         try:
             with connect(
-                    host=self.host,
-                    user=self.auth_username,
-                    password=self.auth_password,
+                host='localhost',
+                user=self.auth_username,
+                password=self.auth_password,
             ) as con:
                 con.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
                 with con.cursor() as cursor:
                     if response_is_empty(search_for_user, con):
-                        cursor.execute(create_user, {password: password})
+                        cursor.execute(create_user, {'password': password})
                     else:
-                        cursor.execute(reset_password, {password: password})
+                        cursor.execute(reset_password, {'password': password})
                     if response_is_empty(search_for_db, con):
                         cursor.execute(create_database)
             return password
@@ -47,3 +46,22 @@ class PostgreSQLService:
         except ProgrammingError:
             raise DatabasePermissionError()
 
+    def delete_db(self, username: str):
+        drop_user = f"DROP USER IF EXISTS {username}"
+        drop_db = f"DROP DATABASE IF EXISTS {username}"
+        try:
+            with connect(
+                    host='localhost',
+                    user=self.auth_username,
+                    password=self.auth_password,
+            ) as con:
+                con.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
+                with con.cursor() as cursor:
+                    cursor.execute(drop_user)
+                    cursor.execute(drop_db)
+        except OperationalError:
+            raise DatabaseConnectionError()
+        except ProgrammingError:
+            raise DatabasePermissionError()
+
+

tests/ceod/db/test_mysql.py

@@ -0,0 +1,11 @@
+import pytest
+
+# ask for mysql and postgres with proper postgres configs and no public schema
+
+# tests are stateless
+# each test should not require anything before or change anything
+# this means you should delete user and databases created after done
+
+# attempt to create database
+# password reset
+# recreate database (user dropped database)

tests/ceod/db/test_postgres.py

@@ -0,0 +1,2 @@
+import pytest
+

tests/ceod_dev.ini

@@ -52,3 +52,11 @@ office = cdrom,audio,video,www
 [auxiliary mailing lists]
 syscom = syscom,syscom-alerts
 exec = exec
+
+[mysql]
+username = mysql
+password = mysql
+
+[postgresql]
+username = postgres
+password = postgres

tests/ceod_test_local.ini

@@ -49,3 +49,11 @@ syscom = office,staff
 [auxiliary mailing lists]
 syscom = syscom,syscom-alerts
 exec = exec
+
+[mysql]
+username = mysql
+password = mysql
+
+[postgresql]
+username = postgres
+password = postgres