tandem
/
numerus
2
0
Fork 0
Code Issues 37 Pull Requests Packages Projects 1 Releases 1 Wiki Activity
numerus/deploy/login.sql

35 lines
772 B
MySQL
Raw Normal View History

Setup authentication schema and user relation User authentication is based on PostgREST’s[0]: There is a noninherit role, authenticator, whose function is only to switch to a different role according to the application’s session. Accordingly, this role has no permission for anything. The roles that this authentication can switch to are guest, invoicer, or admin. Guest is for anonymous users, when they need to login or register; invoicers are regular users; and admin are application’s administrators, that can change other user’s status, when they have to be removed or have they password changed, for example. The user relation is actually inaccessible to all roles and can only be used through a security definer function, login, so that passwords are not accessible from the application. I hesitated on what to use as the user’s primary key. The email seemed a good candiate, because it will be used for login. But something rubs me the wrong way. It is not that they can change because, despite what people on the Internet keeps parroting, they do not need to be “immutable”, PostgreSQL can cascade updates to foreign keys, and people do **not** change email addresses that ofter. What i **do** know is that email addresses should be unique in order to be used for login and password, hovewer i had to decide what “unique” means here, because the domain part is case insensitive, but the local part who knows? I made the arbitrary decision of assuming that the whole address is case sensitive. I have the feeling that this will bite me harder in the ass than using it as the primary key. [0]: https://postgrest.org/en/stable/auth.html
2023-01-13 00:43:20 +00:00
-- Deploy numerus:login to pg
-- requires: roles
-- requires: schema_numerus
-- requires: email
-- requires: user
-- requires: find_user_role
begin;
set search_path to numerus, auth;
create or replace function login(email email, password text) returns name as
$$
declare
role name;
begin
select auth.find_user_role(email, password) into role;
if role is null then
raise invalid_password using message = 'invalid user or password';
end if;
return role;
end;
$$
language plpgsql
Change find_user_role’s and login’s volatility to stable According to PostgreSQL’s manual[0]: “STABLE indicates that the function cannot modify the database, and that within a single table scan it will consistently return the same result for the same argument values, but that its result could change across SQL statements.” This definition matches both functions. Moreover, find_user_role did not need to be written in plpgsql, that i assume—but did not test—are slower than sql functions. [0]: https://www.postgresql.org/docs/14/sql-createfunction.html
2023-01-16 09:02:31 +00:00
stable
Setup authentication schema and user relation User authentication is based on PostgREST’s[0]: There is a noninherit role, authenticator, whose function is only to switch to a different role according to the application’s session. Accordingly, this role has no permission for anything. The roles that this authentication can switch to are guest, invoicer, or admin. Guest is for anonymous users, when they need to login or register; invoicers are regular users; and admin are application’s administrators, that can change other user’s status, when they have to be removed or have they password changed, for example. The user relation is actually inaccessible to all roles and can only be used through a security definer function, login, so that passwords are not accessible from the application. I hesitated on what to use as the user’s primary key. The email seemed a good candiate, because it will be used for login. But something rubs me the wrong way. It is not that they can change because, despite what people on the Internet keeps parroting, they do not need to be “immutable”, PostgreSQL can cascade updates to foreign keys, and people do **not** change email addresses that ofter. What i **do** know is that email addresses should be unique in order to be used for login and password, hovewer i had to decide what “unique” means here, because the domain part is case insensitive, but the local part who knows? I made the arbitrary decision of assuming that the whole address is case sensitive. I have the feeling that this will bite me harder in the ass than using it as the primary key. [0]: https://postgrest.org/en/stable/auth.html
2023-01-13 00:43:20 +00:00
security definer;
comment on function login(email, text) is
'Checks that the email and password pair is valid and returns the user’s databasse role.';
Remove the revocation of all function executions I need to execute some functions in public for citext, such as texticregexeq, or guest users would not be able to login.
2023-01-17 12:05:58 +00:00
revoke execute on function login(email, text) from public;
Setup authentication schema and user relation User authentication is based on PostgREST’s[0]: There is a noninherit role, authenticator, whose function is only to switch to a different role according to the application’s session. Accordingly, this role has no permission for anything. The roles that this authentication can switch to are guest, invoicer, or admin. Guest is for anonymous users, when they need to login or register; invoicers are regular users; and admin are application’s administrators, that can change other user’s status, when they have to be removed or have they password changed, for example. The user relation is actually inaccessible to all roles and can only be used through a security definer function, login, so that passwords are not accessible from the application. I hesitated on what to use as the user’s primary key. The email seemed a good candiate, because it will be used for login. But something rubs me the wrong way. It is not that they can change because, despite what people on the Internet keeps parroting, they do not need to be “immutable”, PostgreSQL can cascade updates to foreign keys, and people do **not** change email addresses that ofter. What i **do** know is that email addresses should be unique in order to be used for login and password, hovewer i had to decide what “unique” means here, because the domain part is case insensitive, but the local part who knows? I made the arbitrary decision of assuming that the whole address is case sensitive. I have the feeling that this will bite me harder in the ass than using it as the primary key. [0]: https://postgrest.org/en/stable/auth.html
2023-01-13 00:43:20 +00:00
grant execute on function login(email, text) to guest;
commit;