modules: Add sandbox.nix
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@ -4,4 +4,5 @@
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{
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mkHost = import ./host.nix { lib = lib; pkgs = pkgs; };
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mkSandbox = pkgs.callPackage ./sandbox.nix {};
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}
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171
modules/sandbox.nix
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171
modules/sandbox.nix
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{
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stdenv, lib
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, runCommandLocal, writeShellScriptBin
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, bubblewrap, coreutils, glibc, pkgsi686Linux
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}:
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runScript: {
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name
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, unshareUser ? true
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, unshareIpc ? true
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, unsharePid ? true
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, unshareNet ? false
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, unshareUts ? true
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, unshareCgroup ? true
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, dieWithParent ? true
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, mountInHome ? []
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, chdirTo ? "\"$(pwd)\""
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, additionalBlacklist ? []
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, additionalMounts ? []
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, extraEnv ? {}
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}:
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let
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etcBindFlags = let
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files = [
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# NixOS Compatibility
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"static"
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"nix" # mainly for nixUnstable users, but also for access to nix/netrc
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# Shells
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"bashrc"
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"zshenv"
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"zshrc"
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"zinputrc"
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"zprofile"
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# Users, Groups, NSS
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"passwd"
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"group"
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"shadow"
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"hosts"
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"resolv.conf"
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"nsswitch.conf"
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# User profiles
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"profiles"
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# Sudo & Su
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"login.defs"
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"sudoers"
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"sudoers.d"
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# Time
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"localtime"
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"zoneinfo"
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# Other Core Stuff
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"machine-id"
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"os-release"
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# PAM
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"pam.d"
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# Fonts
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"fonts"
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# ALSA
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"alsa"
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"asound.conf"
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# SSL
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"ssl/certs"
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"pki"
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];
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in builtins.concatStringsSep "\n "
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(map (file: "--ro-bind-try /etc/${file} /etc/${file}") files);
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# Create this on the fly instead of linking from /nix
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# The container might have to modify it and re-run ldconfig if there are
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# issues running some binary with LD_LIBRARY_PATH
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createLdConfCache = ''
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cat > /etc/ld.so.conf <<EOF
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/lib
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/lib/x86_64-linux-gnu
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/lib64
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/usr/lib
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/usr/lib/x86_64-linux-gnu
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/usr/lib64
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/lib/i386-linux-gnu
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/lib32
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/usr/lib/i386-linux-gnu
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/usr/lib32
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EOF
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ldconfig &> /dev/null
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'';
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init = run: writeShellScriptBin "${name}-init" ''
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source /etc/profile
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${createLdConfCache}
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exec ${run} "$@"
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'';
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extraEnvString = lib.foldl (acc: val: acc + val + "\n") "" (lib.mapAttrsToList (name: value: "--setenv ${name} \"${value}\"") extraEnv);
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mountHome = mountInHome == [];
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bwrapCmd = { initArgs ? "" }: ''
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blacklist=(/nix /dev /proc /etc ${lib.optionalString mountHome "/home"} ${builtins.toString additionalBlacklist})
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ro_mounts=()
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symlinks=()
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declare -a auto_mounts
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# loop through all directories in the root
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for dir in /*; do
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# if it is a directory and it is not in the blacklist
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if [[ -d "$dir" ]] && [[ ! "''${blacklist[@]}" =~ "$dir" ]]; then
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# add it to the mount list
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auto_mounts+=(--bind "$dir" "$dir")
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fi
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done
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if [[ "${lib.optionalString (!mountHome) "1"}" = "1" ]]; then
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for entry in ${builtins.toString mountInHome}; do
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auto_mounts+=(--bind "/home/$USER/$entry" "/home/$USER/$entry")
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done
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fi
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if [[ ! -z "${builtins.toString additionalMounts}" ]]; then
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for entry in ${builtins.toString additionalMounts}; do
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auto_mounts+=(--bind "$entry" "$entry")
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done
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fi
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cmd=(
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${bubblewrap}/bin/bwrap
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--dev-bind /dev /dev
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--proc /proc
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--chdir ${chdirTo}
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${lib.optionalString unshareUser "--unshare-user"}
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${lib.optionalString unshareIpc "--unshare-ipc"}
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${lib.optionalString unsharePid "--unshare-pid"}
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${lib.optionalString unshareNet "--unshare-net"}
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${lib.optionalString unshareUts "--unshare-uts"}
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${lib.optionalString unshareCgroup "--unshare-cgroup"}
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${lib.optionalString dieWithParent "--die-with-parent"}
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--ro-bind /nix /nix
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# Our glibc will look for the cache in its own path in `/nix/store`.
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# As such, we need a cache to exist there, because pressure-vessel
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# depends on the existence of an ld cache. However, adding one
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# globally proved to be a bad idea (see #100655), the solution we
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# settled on being mounting one via bwrap.
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# Also, the cache needs to go to both 32 and 64 bit glibcs, for games
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# of both architectures to work.
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--tmpfs ${glibc}/etc \
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--symlink /etc/ld.so.conf ${glibc}/etc/ld.so.conf \
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--symlink /etc/ld.so.cache ${glibc}/etc/ld.so.cache \
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--ro-bind ${glibc}/etc/rpc ${glibc}/etc/rpc \
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--remount-ro ${glibc}/etc \
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--tmpfs ${pkgsi686Linux.glibc}/etc \
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--symlink /etc/ld.so.conf ${pkgsi686Linux.glibc}/etc/ld.so.conf \
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--symlink /etc/ld.so.cache ${pkgsi686Linux.glibc}/etc/ld.so.cache \
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--ro-bind ${pkgsi686Linux.glibc}/etc/rpc ${pkgsi686Linux.glibc}/etc/rpc \
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--remount-ro ${pkgsi686Linux.glibc}/etc \
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${etcBindFlags}
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"''${ro_mounts[@]}"
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"''${symlinks[@]}"
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"''${auto_mounts[@]}"
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${extraEnvString}
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${init runScript}/bin/${name}-init ${initArgs}
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)
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exec "''${cmd[@]}"
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'';
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bin = writeShellScriptBin name (bwrapCmd { initArgs = ''"$@"''; });
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in stdenv.mkDerivation {
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pname = "${name}-sandboxed";
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version = "1.0.0";
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unpackPhase = ":";
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dontBuild = true;
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installPhase = ''
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mkdir -p $out/bin
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ln -s ${bin}/bin/${name} $out/bin/${name}
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'';
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}
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