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|
{ config, lib, pkgs, ... }:
let
inherit (builtins)
elemAt filter isAttrs isList length trace ;
inherit (lib)
attrNames concatMapStrings concatMapStringsSep concatStrings
concatStringsSep filterAttrs flatten mapAttrsToList mkIf mkOption
optionalString replaceStrings splitString types ;
inherit (types)
attrsOf either listOf str submodule ;
explicit = filterAttrs (n: v: n != "_module" && v != null);
inherit (config.nixsap.apps.mariadb) roles;
basicRoles = filterAttrs (_: v: isAttrs v) roles;
topRoles = filterAttrs (_: v: isList v) roles;
allRoles = attrNames roles;
sqlList = concatMapStringsSep ", " (i: "'${i}'");
concatMapAttrs = f: attrs: concatStrings (mapAttrsToList f attrs);
schemaName = object: elemAt (splitString "." object) 0;
isSchema = object:
let p = splitString "." object;
n = length p;
in (n == 1)
|| (n == 2 && (elemAt p 1) == "%")
|| ((elemAt p 1) == "%" && (elemAt p 2) == "%");
tableName = object: elemAt (splitString "." object) 1;
isTable = object:
let p = splitString "." object;
n = length p;
in (n == 2 && (elemAt p 1) != "%")
|| (n > 2 && (elemAt p 2) == "%");
columnName = object: elemAt (splitString "." object) 2;
isColumn = object:
let p = splitString "." object;
n = length p;
in (n > 2 && (elemAt p 2) != "%");
grant = role: privileges:
{
schemas = concatMapAttrs (priv: objects:
concatMapStrings (o:
let
db = schemaName o;
p = "${replaceStrings [" "] ["_"] priv}_priv";
in ''
SELECT 'GRANT ${priv} ON `${db}`.* TO \'${role}\';'
FROM information_schema.schemata -- Not really used, but for syntax and locks
WHERE NOT EXISTS (
SELECT 1 FROM db
WHERE db.host = ${"''"} -- role, not user
AND db.user = '${role}'
AND '${db}' LIKE db.db
AND db.${p} = 'Y'
) LIMIT 1;
'') (filter isSchema (flatten [objects]))
) (explicit privileges);
tables = concatMapAttrs (priv: objects:
concatMapStrings (o: ''
SELECT CONCAT('GRANT ${priv} ON `', t.table_schema, '`.`', t.table_name, '` TO \'${role}\';')
FROM information_schema.tables t
WHERE t.table_schema LIKE '${schemaName o}'
AND t.table_name LIKE '${tableName o}'
AND NOT EXISTS (
SELECT 1 FROM mysql.tables_priv
WHERE tables_priv.host = ${"''"} -- role, not user
AND tables_priv.user = '${role}'
AND tables_priv.db = t.table_schema
AND tables_priv.table_name = t.table_name
AND FIND_IN_SET('${priv}', tables_priv.table_priv) > 0
);
'') (filter isTable (flatten [objects]))
) (explicit privileges);
columns = concatMapAttrs (priv: objects:
let colObjs = filter isColumn (flatten [objects]);
in optionalString ([] != colObjs) (''
SELECT CONCAT ('GRANT ${priv}(',
GROUP_CONCAT(DISTINCT c.column_name SEPARATOR ','),
') ON `', c.table_schema, '`.`', c.table_name, '` TO \'${role}\';')
FROM information_schema.columns c WHERE (
'' + concatMapStringsSep " OR " (o:
''
( c.table_schema LIKE '${schemaName o}' AND
c.table_name LIKE '${tableName o}' AND
c.column_name LIKE '${columnName o}')
'') colObjs
+
''
) AND NOT EXISTS (
SELECT 1 FROM columns_priv
WHERE columns_priv.host = ${"''"} -- role, not user
AND columns_priv.user = '${role}'
AND columns_priv.db = c.table_schema
AND columns_priv.table_name = c.table_name
AND columns_priv.column_name = c.column_name
AND FIND_IN_SET('${priv}', columns_priv.column_priv) > 0
) GROUP BY CONCAT(c.table_schema, c.table_name);
'')
) (explicit privileges);
};
refreshRolesSQL =
let
sql = concatMapAttrs (role: privileges: ''
${(grant role privileges).schemas}
${(grant role privileges).tables}
${(grant role privileges).columns}
'') basicRoles;
in pkgs.writeText "refresh-roles.sql" sql;
refreshRoles = pkgs.writeBashScriptBin "refreshRoles" ''
set -euo pipefail
doze() {
difference=$(($(date -d "08:00" +%s) - $(date +%s)))
if [ $difference -lt 0 ]; then
sleep $((86400 + difference))
else
sleep $difference
fi
}
while true; do
while ! mysql -e ';'; do
sleep 5s
done
tmp=$(mktemp)
trap 'rm -f "$tmp"' EXIT
mysql -N mysql < ${refreshRolesSQL} >> "$tmp"
mysql -v mysql < "$tmp"
doze
done
'';
addRoles = ''
${concatMapStrings (r: "CREATE ROLE IF NOT EXISTS '${r}';\n") (attrNames roles)}
${concatStrings
(mapAttrsToList (role: subroles: ''
${concatMapStringsSep "\n" (r: "GRANT '${r}' TO '${role}';") subroles}
'') topRoles)
}
'';
revokeRoles = ''
${concatMapAttrs (role: subroles: ''
SELECT CONCAT('REVOKE \''', role, '\' FROM \''', user, '\';') FROM roles_mapping
WHERE user = '${role}'
AND role NOT IN (${sqlList subroles});
'') topRoles
}
SELECT CONCAT('DROP ROLE \''', user, '\';') FROM user WHERE is_role='Y'
${optionalString (allRoles != []) "AND user NOT IN (${sqlList allRoles})"}
;
'';
roleType =
let
objects = mkOption {
type = either str (listOf str);
default = [];
example = [
"%bleep.%.created\_at"
"%bob\_live\_sg.brand\_type"
"%bob\_live\_sg.catalog%"
"%bob\_live\_sg.supplier.status"
"bar.%"
"beep"
"foo.%.%"
];
};
basicRole = submodule {
options.nixsap = {
"ALL" = objects;
"ALTER" = objects;
"CREATE" = objects;
"DELETE" = objects;
"DROP" = objects;
"INDEX" = objects;
"INSERT" = objects;
"SELECT" = objects;
"SHOW VIEW" = objects;
"UPDATE" = objects;
};
};
topRole = listOf str;
in either basicRole topRole;
in {
options.nixsap.apps.mariadb = {
roles = mkOption {
type = attrsOf roleType;
default = {};
description = ''
Defines MariaDB roles. A role can be a "basic" one or a "top"
one. The basic roles are granted of regular privileges like SELECT
or UPDATE, while the top roles are granted of other roles. For basic
roles MySQL wildcards ("%" and "_") can be used to specify objects
to be granted on, including databases, tables and columns names. A
script runs periodically to find all matching objects and grants on
them. Objects are denoted as "schema[.table[.column]]".
'';
example = {
top_role = [ "basic_role" ];
basic_role = {
SELECT = [
"%bob\_live\_sg.brand\_type"
"%bob\_live\_sg.catalog%"
"%bob\_live\_sg.supplier.created\_at"
"%bob\_live\_sg.supplier.id\_supplier"
"%bob\_live\_sg.supplier.name%"
"%bob\_live\_sg.supplier.status"
"%bob\_live\_sg.supplier.type"
"%bob\_live\_sg.supplier.updated\_at"
];
};
monitoring = {
SELECT = [
"%.%.created_at"
];
};
};
};
};
config = {
nixsap.apps.mariadb.configure = optionalString (roles != {}) addRoles;
nixsap.apps.mariadb.configure' = revokeRoles;
systemd.services.mariadb-roles = mkIf (basicRoles != {}) {
description = "refresh MariaDB basic roles";
after = [ "mariadb.service" "mariadb-maintenance.service" ];
wantedBy = [ "multi-user.target" ];
path = [ pkgs.mariadb ];
serviceConfig = {
ExecStart = "${refreshRoles}/bin/refreshRoles";
User = config.nixsap.apps.mariadb.user;
Restart = "always";
};
};
};
}
|
