Databases¶
Authentication |
Users |
Password |
---|---|---|
✔ |
✔ |
✔ |
Presentation¶
Drivers¶
LL::NG can use a lot of databases as authentication, users and password backend:
MariaDB/MySQL
PostGreSQL
Oracle
…
Indeed, any Perl DBD driver can be used.
Schema¶
LL::NG can use two tables:
Authentication table: where login and password are stored
User table: where user data are stored (mail, name, etc.)
Tip
Authentication table and user table can be the same.
The password can be in plain text, or encoded with a standard SQL method:
SHA
SHA1
MD5
Example 1: two tables¶
Authentication table¶
id |
login |
password |
---|---|---|
0 |
coudot |
1f777a6581e478499f4284e54fe2d4a4e513dfff |
1 |
xguimard |
a15a18c8bb17e6f67886a9af1898c018b9f5a072 |
2 |
tchemineau |
1f777a6581e478499f4284e54fe2d4a4e513dfff |
User table¶
id |
user |
name |
|
---|---|---|---|
0 |
coudot |
Clément OUDOT |
|
1 |
tchemineau |
Thomas CHEMINEAU |
|
2 |
xguimard |
Xavier GUIMARD |
Example 2: single table¶
id |
user |
password |
name |
|
---|---|---|---|---|
0 |
coudot |
1f777a6581e478499f4284e54fe2d4a4e513dfff |
Clément OUDOT |
|
1 |
tchemineau |
1f777a6581e478499f4284e54fe2d4a4e513dfff |
Thomas CHEMINEAU |
|
2 |
xguimard |
a15a18c8bb17e6f67886a9af1898c018b9f5a072 |
Xavier GUIMARD |
SQL¶
LL::NG will operate some SQL queries:
Authentication: select row in authentication table matching user and password
Search user: select row in user table matching user
Change password: update password column in authentication table matching user
Configuration¶
In Manager, go in General Parameters
> Authentication modules
and choose Database (DBI) for authentication, users and/or password
modules.
Authentication level¶
The authentication level given to users authenticated with this module.
Attention
As DBI is a login/password based module, the authentication level can be:
increased (+1) if portal is protected by SSL (HTTPS)
decreased (-1) if the portal autocompletion is allowed (see portal customization)
Exported variables¶
List of columns to query to fill user session. See also exported variables configuration.
Connection¶
Tip
Connection settings can be configured differently for authentication process and user process. This allows one to use different databases for these process. By default, if user process connection settings are empty, authentication process connection settings will be used.
Chain: DBI chain, including database driver name and database name (for example: dbi:mysql:database=lemonldapng;host=localhost).
User: Connection user
Password: Connection password
Schema¶
Authentication table: authentication table name
User table: user table name
Login field name: name of authentication table column hosting login
Password field name: name of authentication table column hosting password
Mail field name: name of authentication table column hosting mail (for password reset)
Login field name in user table: name of user table column hosting login
Password¶
Hash schema: SQL method for hashing password. Can be left blank for plain text passwords.
Dynamic hash activation: Activate dynamic hashing. With dynamic hashing, the hash scheme is recovered from the user password in the database during authentication.
Supported non-salted schemes: List of whitespace separated hash schemes. Every hash scheme MUST match a non-salted hash function in the database. LemonLDAP::NG relies on this hashing function for computing user password hashes. These hashes MUST NOT be salted (no random data used in conjunction with the password).
Supported salted schemes: List of whitespace separated salted hash schemes, of the form “sscheme”, where scheme MUST match a non-salted hash function in the database. LemonLDAP::NG relies on this hashing function for computing user password hashes. Salted and non-salted scheme lists are not necessarily equivalent. (for example: non-salted=”sha256” and salted=”ssha ssha512” is valid)
Dynamic hash scheme for new passwords: LemonLDAP::NG is able to store new passwords in the database (while modifying or reinitializing the password). You can choose a salted or non salted dynamic hashed password. The value must be an element of “Supported non-salted schemes” or “Supported salted schemes”.
Attention
The SQL function MUST have hexadecimal values as input AND output
Tip
Here is an example for creating a postgreSQL SHA256 function.
1. Install postgresql-contrib. 2. Activate extension:
CREATE EXTENSION pgcrypto;
3. Create the hash function:
CREATE OR REPLACE FUNCTION sha256(varchar) returns text AS $$
SELECT encode(digest(decode($1, 'hex'), 'sha256'), 'hex')
$$ LANGUAGE SQL STRICT IMMUTABLE;