466 lines
18 KiB
Nix
466 lines
18 KiB
Nix
{ config, pkgs, lib, ... }:
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let
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cfg = config.users.mysql;
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in
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{
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meta.maintainers = [ lib.maintainers.netali ];
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options = {
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users.mysql = {
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enable = lib.mkEnableOption "authentication against a MySQL/MariaDB database";
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host = lib.mkOption {
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type = lib.types.str;
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example = "localhost";
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description = "The hostname of the MySQL/MariaDB server";
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};
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database = lib.mkOption {
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type = lib.types.str;
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example = "auth";
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description = "The name of the database containing the users";
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};
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user = lib.mkOption {
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type = lib.types.str;
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example = "nss-user";
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description = "The username to use when connecting to the database";
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};
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passwordFile = lib.mkOption {
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type = lib.types.path;
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example = "/run/secrets/mysql-auth-db-passwd";
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description = "The path to the file containing the password for the user";
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};
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pam = lib.mkOption {
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description = "Settings for `pam_mysql`";
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type = lib.types.submodule {
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options = {
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table = lib.mkOption {
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type = lib.types.str;
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example = "users";
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description = "The name of table that maps unique login names to the passwords.";
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};
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updateTable = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = "users_updates";
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description = ''
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The name of the table used for password alteration. If not defined, the value
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of the `table` option will be used instead.
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'';
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};
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userColumn = lib.mkOption {
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type = lib.types.str;
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example = "username";
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description = "The name of the column that contains a unix login name.";
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};
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passwordColumn = lib.mkOption {
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type = lib.types.str;
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example = "password";
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description = "The name of the column that contains a (encrypted) password string.";
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};
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statusColumn = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = "status";
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description = ''
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The name of the column or an SQL expression that indicates the status of
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the user. The status is expressed by the combination of two bitfields
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shown below:
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- `bit 0 (0x01)`:
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if flagged, `pam_mysql` deems the account to be expired and
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returns `PAM_ACCT_EXPIRED`. That is, the account is supposed
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to no longer be available. Note this doesn't mean that `pam_mysql`
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rejects further authentication operations.
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- `bit 1 (0x02)`:
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if flagged, `pam_mysql` deems the authentication token
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(password) to be expired and returns `PAM_NEW_AUTHTOK_REQD`.
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This ends up requiring that the user enter a new password.
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'';
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};
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passwordCrypt = lib.mkOption {
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example = "2";
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type = lib.types.enum [
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"0" "plain"
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"1" "Y"
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"2" "mysql"
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"3" "md5"
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"4" "sha1"
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"5" "drupal7"
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"6" "joomla15"
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"7" "ssha"
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"8" "sha512"
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"9" "sha256"
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];
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description = ''
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The method to encrypt the user's password:
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- `0` (or `"plain"`):
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No encryption. Passwords are stored in plaintext. HIGHLY DISCOURAGED.
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- `1` (or `"Y"`):
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Use crypt(3) function.
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- `2` (or `"mysql"`):
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Use the MySQL PASSWORD() function. It is possible that the encryption function used
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by `pam_mysql` is different from that of the MySQL server, as
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`pam_mysql` uses the function defined in MySQL's C-client API
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instead of using PASSWORD() SQL function in the query.
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- `3` (or `"md5"`):
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Use plain hex MD5.
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- `4` (or `"sha1"`):
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Use plain hex SHA1.
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- `5` (or `"drupal7"`):
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Use Drupal7 salted passwords.
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- `6` (or `"joomla15"`):
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Use Joomla15 salted passwords.
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- `7` (or `"ssha"`):
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Use ssha hashed passwords.
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- `8` (or `"sha512"`):
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Use sha512 hashed passwords.
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- `9` (or `"sha256"`):
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Use sha256 hashed passwords.
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'';
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};
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cryptDefault = lib.mkOption {
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type = lib.types.nullOr (lib.types.enum [ "md5" "sha256" "sha512" "blowfish" ]);
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default = null;
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example = "blowfish";
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description = "The default encryption method to use for `passwordCrypt = 1`.";
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};
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where = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = "host.name='web' AND user.active=1";
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description = "Additional criteria for the query.";
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};
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verbose = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = ''
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If enabled, produces logs with detailed messages that describes what
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`pam_mysql` is doing. May be useful for debugging.
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'';
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};
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disconnectEveryOperation = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = ''
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By default, `pam_mysql` keeps the connection to the MySQL
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database until the session is closed. If this option is set to true it
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disconnects every time the PAM operation has finished. This option may
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be useful in case the session lasts quite long.
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'';
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};
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logging = {
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enable = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = "Enables logging of authentication attempts in the MySQL database.";
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};
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table = lib.mkOption {
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type = lib.types.str;
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example = "logs";
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description = "The name of the table to which logs are written.";
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};
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msgColumn = lib.mkOption {
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type = lib.types.str;
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example = "msg";
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description = ''
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The name of the column in the log table to which the description
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of the performed operation is stored.
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'';
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};
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userColumn = lib.mkOption {
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type = lib.types.str;
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example = "user";
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description = ''
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The name of the column in the log table to which the name of the
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user being authenticated is stored.
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'';
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};
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pidColumn = lib.mkOption {
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type = lib.types.str;
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example = "pid";
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description = ''
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The name of the column in the log table to which the pid of the
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process utilising the `pam_mysql` authentication
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service is stored.
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'';
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};
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hostColumn = lib.mkOption {
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type = lib.types.str;
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example = "host";
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description = ''
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The name of the column in the log table to which the name of the user
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being authenticated is stored.
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'';
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};
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rHostColumn = lib.mkOption {
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type = lib.types.str;
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example = "rhost";
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description = ''
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The name of the column in the log table to which the name of the remote
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host that initiates the session is stored. The value is supposed to be
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set by the PAM-aware application with `pam_set_item(PAM_RHOST)`.
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'';
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};
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timeColumn = lib.mkOption {
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type = lib.types.str;
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example = "timestamp";
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description = ''
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The name of the column in the log table to which the timestamp of the
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log entry is stored.
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'';
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};
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};
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};
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};
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};
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nss = lib.mkOption {
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description = ''
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Settings for `libnss-mysql`.
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All examples are from the [minimal example](https://github.com/saknopper/libnss-mysql/tree/master/sample/minimal)
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of `libnss-mysql`, but they are modified with NixOS paths for bash.
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'';
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type = lib.types.submodule {
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options = {
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getpwnam = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT username,'x',uid,'5000','MySQL User', CONCAT('/home/',username),'/run/sw/current-system/bin/bash' \
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FROM users \
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WHERE username='%1$s' \
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LIMIT 1
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'';
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description = ''
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SQL query for the [getpwnam](https://man7.org/linux/man-pages/man3/getpwnam.3.html)
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syscall.
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'';
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};
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getpwuid = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT username,'x',uid,'5000','MySQL User', CONCAT('/home/',username),'/run/sw/current-system/bin/bash' \
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FROM users \
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WHERE uid='%1$u' \
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LIMIT 1
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'';
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description = ''
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SQL query for the [getpwuid](https://man7.org/linux/man-pages/man3/getpwuid.3.html)
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syscall.
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'';
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};
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getspnam = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT username,password,'1','0','99999','0','0','-1','0' \
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FROM users \
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WHERE username='%1$s' \
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LIMIT 1
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'';
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description = ''
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SQL query for the [getspnam](https://man7.org/linux/man-pages/man3/getspnam.3.html)
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syscall.
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'';
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};
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getpwent = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT username,'x',uid,'5000','MySQL User', CONCAT('/home/',username),'/run/sw/current-system/bin/bash' FROM users
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'';
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description = ''
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SQL query for the [getpwent](https://man7.org/linux/man-pages/man3/getpwent.3.html)
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syscall.
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'';
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};
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getspent = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT username,password,'1','0','99999','0','0','-1','0' FROM users
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'';
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description = ''
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SQL query for the [getspent](https://man7.org/linux/man-pages/man3/getspent.3.html)
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syscall.
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'';
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};
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getgrnam = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT name,password,gid FROM groups WHERE name='%1$s' LIMIT 1
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'';
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description = ''
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SQL query for the [getgrnam](https://man7.org/linux/man-pages/man3/getgrnam.3.html)
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syscall.
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'';
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};
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getgrgid = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT name,password,gid FROM groups WHERE gid='%1$u' LIMIT 1
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'';
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description = ''
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SQL query for the [getgrgid](https://man7.org/linux/man-pages/man3/getgrgid.3.html)
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syscall.
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'';
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};
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getgrent = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT name,password,gid FROM groups
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'';
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description = ''
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SQL query for the [getgrent](https://man7.org/linux/man-pages/man3/getgrent.3.html)
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syscall.
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'';
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};
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memsbygid = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT username FROM grouplist WHERE gid='%1$u'
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'';
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description = ''
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SQL query for the [memsbygid](https://man7.org/linux/man-pages/man3/memsbygid.3.html)
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syscall.
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'';
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};
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gidsbymem = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = lib.literalExpression ''
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SELECT gid FROM grouplist WHERE username='%1$s'
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'';
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description = ''
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SQL query for the [gidsbymem](https://man7.org/linux/man-pages/man3/gidsbymem.3.html)
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syscall.
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'';
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};
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};
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};
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};
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};
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};
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config = lib.mkIf cfg.enable {
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system.nssModules = [ pkgs.libnss-mysql ];
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system.nssDatabases.shadow = [ "mysql" ];
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system.nssDatabases.group = [ "mysql" ];
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system.nssDatabases.passwd = [ "mysql" ];
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environment.etc."security/pam_mysql.conf" = {
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user = "root";
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group = "root";
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mode = "0600";
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# password will be added from password file in systemd oneshot
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text = ''
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users.host=${cfg.host}
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users.db_user=${cfg.user}
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users.database=${cfg.database}
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users.table=${cfg.pam.table}
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users.user_column=${cfg.pam.userColumn}
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users.password_column=${cfg.pam.passwordColumn}
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users.password_crypt=${cfg.pam.passwordCrypt}
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users.disconnect_every_operation=${if cfg.pam.disconnectEveryOperation then "1" else "0"}
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verbose=${if cfg.pam.verbose then "1" else "0"}
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'' + lib.optionalString (cfg.pam.cryptDefault != null) ''
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users.use_${cfg.pam.cryptDefault}=1
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'' + lib.optionalString (cfg.pam.where != null) ''
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users.where_clause=${cfg.pam.where}
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'' + lib.optionalString (cfg.pam.statusColumn != null) ''
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users.status_column=${cfg.pam.statusColumn}
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'' + lib.optionalString (cfg.pam.updateTable != null) ''
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users.update_table=${cfg.pam.updateTable}
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'' + lib.optionalString cfg.pam.logging.enable ''
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log.enabled=true
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log.table=${cfg.pam.logging.table}
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log.message_column=${cfg.pam.logging.msgColumn}
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log.pid_column=${cfg.pam.logging.pidColumn}
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log.user_column=${cfg.pam.logging.userColumn}
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log.host_column=${cfg.pam.logging.hostColumn}
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log.rhost_column=${cfg.pam.logging.rHostColumn}
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log.time_column=${cfg.pam.logging.timeColumn}
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'';
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};
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environment.etc."libnss-mysql.cfg" = {
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mode = "0600";
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user = config.services.nscd.user;
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group = config.services.nscd.group;
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text = lib.optionalString (cfg.nss.getpwnam != null) ''
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getpwnam ${cfg.nss.getpwnam}
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'' + lib.optionalString (cfg.nss.getpwuid != null) ''
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getpwuid ${cfg.nss.getpwuid}
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'' + lib.optionalString (cfg.nss.getspnam != null) ''
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getspnam ${cfg.nss.getspnam}
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'' + lib.optionalString (cfg.nss.getpwent != null) ''
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getpwent ${cfg.nss.getpwent}
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'' + lib.optionalString (cfg.nss.getspent != null) ''
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getspent ${cfg.nss.getspent}
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'' + lib.optionalString (cfg.nss.getgrnam != null) ''
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getgrnam ${cfg.nss.getgrnam}
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'' + lib.optionalString (cfg.nss.getgrgid != null) ''
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getgrgid ${cfg.nss.getgrgid}
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'' + lib.optionalString (cfg.nss.getgrent != null) ''
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getgrent ${cfg.nss.getgrent}
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'' + lib.optionalString (cfg.nss.memsbygid != null) ''
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memsbygid ${cfg.nss.memsbygid}
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'' + lib.optionalString (cfg.nss.gidsbymem != null) ''
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gidsbymem ${cfg.nss.gidsbymem}
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'' + ''
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host ${cfg.host}
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database ${cfg.database}
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'';
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};
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environment.etc."libnss-mysql-root.cfg" = {
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mode = "0600";
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user = config.services.nscd.user;
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group = config.services.nscd.group;
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# password will be added from password file in systemd oneshot
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text = ''
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username ${cfg.user}
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'';
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};
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systemd.services.mysql-auth-pw-init = {
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description = "Adds the mysql password to the mysql auth config files";
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before = [ "nscd.service" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "oneshot";
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User = "root";
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Group = "root";
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};
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restartTriggers = [
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config.environment.etc."security/pam_mysql.conf".source
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config.environment.etc."libnss-mysql.cfg".source
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config.environment.etc."libnss-mysql-root.cfg".source
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];
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script = ''
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if [[ -r ${cfg.passwordFile} ]]; then
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umask 0077
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conf_nss="$(mktemp)"
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cp /etc/libnss-mysql-root.cfg $conf_nss
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printf 'password %s\n' "$(cat ${cfg.passwordFile})" >> $conf_nss
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mv -fT "$conf_nss" /etc/libnss-mysql-root.cfg
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chown ${config.services.nscd.user}:${config.services.nscd.group} /etc/libnss-mysql-root.cfg
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conf_pam="$(mktemp)"
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cp /etc/security/pam_mysql.conf $conf_pam
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printf 'users.db_passwd=%s\n' "$(cat ${cfg.passwordFile})" >> $conf_pam
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mv -fT "$conf_pam" /etc/security/pam_mysql.conf
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fi
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'';
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};
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};
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}
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