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grub: add support for passwords

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This patch adds support for user accounts/passwords in GRUB 2.
When configured, everything but the default option is password-protected.
This commit is contained in:
Sean Buckley 2019-07-21 16:39:07 +00:00 committed by rnhmjoj
parent 48dd117b24
commit 37ec7c488a
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GPG key ID: BFBAF4C975F76450
2 changed files with 104 additions and 3 deletions
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62
nixos/modules/system/boot/loader/grub/grub.nix
View file

@ -55,6 +55,7 @@ let
storePath = config.boot.loader.grub.storePath;
bootloaderId = if args.efiBootloaderId == null then "NixOS${efiSysMountPoint'}" else args.efiBootloaderId;
timeout = if config.boot.loader.timeout == null then -1 else config.boot.loader.timeout;
users = if cfg.users == {} || cfg.version != 1 then cfg.users else throw "GRUB version 1 does not support user accounts.";
inherit efiSysMountPoint;
inherit (args) devices;
inherit (efi) canTouchEfiVariables;
@ -137,6 +138,67 @@ in
'';
};
users = mkOption {
default = {};
example = {
root = { hashedPasswordFile = "/path/to/file"; };
};
description = ''
User accounts for GRUB. When specified, the GRUB command line and
all boot options except the default are password-protected.
All passwords and hashes provided will be stored in /boot/grub/grub.cfg,
and will be visible to any local user who can read this file. Additionally,
any passwords and hashes provided directly in a Nix configuration
(as opposed to external files) will be copied into the Nix store, and
will be visible to all local users.
'';
type = with types; attrsOf (submodule {
options = {
hashedPasswordFile = mkOption {
example = "/path/to/file";
default = null;
type = with types; uniq (nullOr str);
description = ''
Specifies the path to a file containing the password hash
for the account, generated with grub-mkpasswd-pbkdf2.
This hash will be stored in /boot/grub/grub.cfg, and will
be visible to any local user who can read this file.
'';
};
hashedPassword = mkOption {
example = "grub.pbkdf2.sha512.10000.674DFFDEF76E13EA...2CC972B102CF4355";
default = null;
type = with types; uniq (nullOr str);
description = ''
Specifies the password hash for the account,
generated with grub-mkpasswd-pbkdf2.
This hash will be copied to the Nix store, and will be visible to all local users.
'';
};
passwordFile = mkOption {
example = "/path/to/file";
default = null;
type = with types; uniq (nullOr str);
description = ''
Specifies the path to a file containing the
clear text password for the account.
This password will be stored in /boot/grub/grub.cfg, and will
be visible to any local user who can read this file.
'';
};
password = mkOption {
example = "Pa$$w0rd!";
default = null;
type = with types; uniq (nullOr str);
description = ''
Specifies the clear text password for the account.
This password will be copied to the Nix store, and will be visible to all local users.
'';
};
};
});
};
mirroredBoots = mkOption {
default = [ ];
example = [

45
nixos/modules/system/boot/loader/grub/install-grub.pl
View file

@ -247,6 +247,45 @@ if ($grubVersion == 1) {
}
else {
my @users = ();
foreach my $user ($dom->findnodes('/expr/attrs/attr[@name = "users"]/attrs/attr')) {
my $name = $user->findvalue('@name') or die;
my $hashedPassword = $user->findvalue('./attrs/attr[@name = "hashedPassword"]/string/@value');
my $hashedPasswordFile = $user->findvalue('./attrs/attr[@name = "hashedPasswordFile"]/string/@value');
my $password = $user->findvalue('./attrs/attr[@name = "password"]/string/@value');
my $passwordFile = $user->findvalue('./attrs/attr[@name = "passwordFile"]/string/@value');
if ($hashedPasswordFile) {
open(my $f, '<', $hashedPasswordFile) or die "Can't read file '$hashedPasswordFile'!";
$hashedPassword = <$f>;
chomp $hashedPassword;
}
if ($passwordFile) {
open(my $f, '<', $passwordFile) or die "Can't read file '$passwordFile'!";
$password = <$f>;
chomp $password;
}
if ($hashedPassword) {
if (index($hashedPassword, "grub.pbkdf2.") == 0) {
$conf .= "\npassword_pbkdf2 $name $hashedPassword";
}
else {
die "Password hash for GRUB user '$name' is not valid!";
}
}
elsif ($password) {
$conf .= "\npassword $name $password";
}
else {
die "GRUB user '$name' has no password!";
}
push(@users, $name);
}
if (@users) {
$conf .= "\nset superusers=\"" . join(' ',@users) . "\"\n";
}
if ($copyKernels == 0) {
$conf .= "
" . $grubStore->search;
@ -350,7 +389,7 @@ sub copyToKernelsDir {
}
sub addEntry {
my ($name, $path) = @_;
my ($name, $path, $options) = @_;
return unless -e "$path/kernel" && -e "$path/initrd";
my $kernel = copyToKernelsDir(Cwd::abs_path("$path/kernel"));
@ -396,7 +435,7 @@ sub addEntry {
$conf .= " " . ($xen ? "module" : "kernel") . " $kernel $kernelParams\n";
$conf .= " " . ($xen ? "module" : "initrd") . " $initrd\n\n";
} else {
$conf .= "menuentry \"$name\" {\n";
$conf .= "menuentry \"$name\" " . ($options||"") . " {\n";
$conf .= $grubBoot->search . "\n";
if ($copyKernels == 0) {
$conf .= $grubStore->search . "\n";
@ -413,7 +452,7 @@ sub addEntry {
# Add default entries.
$conf .= "$extraEntries\n" if $extraEntriesBeforeNixOS;
addEntry("NixOS - Default", $defaultConfig);
addEntry("NixOS - Default", $defaultConfig, "--unrestricted");
$conf .= "$extraEntries\n" unless $extraEntriesBeforeNixOS;