257 lines
7.3 KiB
Nix
257 lines
7.3 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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let
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ids = config.ids;
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# User accounts to be created/updated by NixOS.
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users =
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let
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defaultUsers =
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[ { name = "root";
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uid = ids.uids.root;
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description = "System administrator";
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home = "/root";
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shell = config.users.defaultUserShell;
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group = "root";
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}
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{ name = "nobody";
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uid = ids.uids.nobody;
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description = "Unprivileged account (don't use!)";
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}
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];
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# !!! Use NixOS module system to add default attributes.
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addAttrs =
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{ name
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, description
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, uid ? ""
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, group ? "nogroup"
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, extraGroups ? []
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, home ? "/var/empty"
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, shell ? (if useDefaultShell then config.users.defaultUserShell else "/noshell")
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, createHome ? false
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, useDefaultShell ? false
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, password ? null
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, isSystemUser ? true
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}:
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{ inherit name description uid group extraGroups home shell createHome password isSystemUser; };
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in map addAttrs (defaultUsers ++ config.users.extraUsers);
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# Groups to be created/updated by NixOS.
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groups =
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let
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defaultGroups =
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[ { name = "root";
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gid = ids.gids.root;
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}
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{ name = "wheel";
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gid = ids.gids.wheel;
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}
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{ name = "disk";
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gid = ids.gids.disk;
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}
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{ name = "kmem";
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gid = ids.gids.kmem;
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}
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{ name = "tty";
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gid = ids.gids.tty;
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}
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{ name = "floppy";
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gid = ids.gids.floppy;
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}
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{ name = "uucp";
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gid = ids.gids.uucp;
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}
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{ name = "lp";
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gid = ids.gids.lp;
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}
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{ name = "cdrom";
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gid = ids.gids.cdrom;
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}
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{ name = "tape";
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gid = ids.gids.tape;
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}
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{ name = "video";
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gid = ids.gids.video;
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}
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{ name = "dialout";
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gid = ids.gids.dialout;
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}
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{ name = "nogroup";
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gid = ids.gids.nogroup;
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}
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{ name = "users";
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gid = ids.gids.users;
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}
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{ name = "nixbld";
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gid = ids.gids.nixbld;
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}
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{ name = "utmp";
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gid = ids.gids.utmp;
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}
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];
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addAttrs =
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{ name, gid ? "" }:
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{ inherit name gid; };
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in map addAttrs (defaultGroups ++ config.users.extraGroups);
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# Note: the 'X' in front of the password is to distinguish between
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# having an empty password, and not having a password.
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serializedUser = u: "${u.name}\n${u.description}\n${toString u.uid}\n${u.group}\n${toString (concatStringsSep "," u.extraGroups)}\n${u.home}\n${u.shell}\n${toString u.createHome}\n${if u.password != null then "X" + u.password else ""}\n${toString u.isSystemUser}\n";
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serializedGroup = g: "${g.name}\n${toString g.gid}";
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# keep this extra file so that cat can be used to pass special chars such as "`" which is used in the avahi daemon
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usersFile = pkgs.writeText "users" (concatStrings (map serializedUser users));
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in
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{
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###### interface
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options = {
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users.extraUsers = mkOption {
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default = [];
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example =
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[ { name = "alice";
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uid = 1234;
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description = "Alice";
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home = "/home/alice";
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createHome = true;
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group = "users";
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extraGroups = ["wheel"];
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shell = "/bin/sh";
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password = "foobar";
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}
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];
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description = ''
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Additional user accounts to be created automatically by the system.
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'';
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};
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users.extraGroups = mkOption {
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default = [];
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example =
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[ { name = "students";
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gid = 1001;
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}
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];
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description = ''
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Additional groups to be created automatically by the system.
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'';
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};
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};
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###### implementation
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config = {
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system.activationScripts.rootPasswd = stringAfter [ "etc" ]
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''
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# If there is no password file yet, create a root account with an
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# empty password.
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if ! test -e /etc/passwd; then
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rootHome=/root
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touch /etc/passwd; chmod 0644 /etc/passwd
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touch /etc/group; chmod 0644 /etc/group
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touch /etc/shadow; chmod 0600 /etc/shadow
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# Can't use useradd, since it complains that it doesn't know us
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# (bootstrap problem!).
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echo "root:x:0:0:System administrator:$rootHome:${config.users.defaultUserShell}" >> /etc/passwd
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echo "root::::::::" >> /etc/shadow
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fi
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'';
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system.activationScripts.users = stringAfter [ "groups" ]
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''
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echo "updating users..."
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cat ${usersFile} | while true; do
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read name || break
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read description
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read uid
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read group
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read extraGroups
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read home
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read shell
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read createHome
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read password
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read isSystemUser
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if ! curEnt=$(getent passwd "$name"); then
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useradd ''${isSystemUser:+--system} \
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--comment "$description" \
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''${uid:+--uid $uid} \
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--gid "$group" \
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--groups "$extraGroups" \
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--home "$home" \
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--shell "$shell" \
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''${createHome:+--create-home} \
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"$name"
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if test "''${password:0:1}" = 'X'; then
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(echo "''${password:1}"; echo "''${password:1}") | ${pkgs.shadow}/bin/passwd "$name"
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fi
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else
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#echo "updating user $name..."
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oldIFS="$IFS"; IFS=:; set -- $curEnt; IFS="$oldIFS"
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prevUid=$3
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prevHome=$6
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# Don't change the UID if it's the same, otherwise usermod
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# will complain.
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if test "$prevUid" = "$uid"; then unset uid; fi
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# Don't change the home directory if it's the same to prevent
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# unnecessary warnings about logged in users.
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if test "$prevHome" = "$home"; then unset home; fi
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usermod \
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--comment "$description" \
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''${uid:+--uid $uid} \
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--gid "$group" \
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--groups "$extraGroups" \
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''${home:+--home "$home"} \
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--shell "$shell" \
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"$name"
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fi
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done
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'';
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system.activationScripts.groups = stringAfter [ "rootPasswd" "binsh" "etc" "var" ]
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''
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echo "updating groups..."
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while true; do
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read name || break
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read gid
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if ! curEnt=$(getent group "$name"); then
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groupadd --system \
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''${gid:+--gid $gid} \
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"$name"
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else
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#echo "updating group $name..."
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oldIFS="$IFS"; IFS=:; set -- $curEnt; IFS="$oldIFS"
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prevGid=$3
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if test -n "$gid" -a "$prevGid" != "$gid"; then
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groupmod --gid $gid "$name"
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fi
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fi
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done <<EndOfGroupList
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${concatStringsSep "\n" (map serializedGroup groups)}
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EndOfGroupList
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'';
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};
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}
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