129 lines
4.2 KiB
Nix
129 lines
4.2 KiB
Nix
{ lib
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, runCommand
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, runtimeShell
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, sane-sandboxed
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, writeTextFile
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}:
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{ pkgName, package, method, vpn ? null, allowedHomePaths ? [], allowedRootPaths ? [], binMap ? {} }:
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let
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sane-sandboxed' = sane-sandboxed.meta.mainProgram; #< load by bin name to reduce rebuilds
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allowPath = p: [
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"--sane-sandbox-path"
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p
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];
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allowHomePath = p: [
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"--sane-sandbox-home-path"
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p
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];
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allowPaths = paths: lib.flatten (builtins.map allowPath paths);
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allowHomePaths = paths: lib.flatten (builtins.map allowHomePath paths);
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vpnItems = [
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"--sane-sandbox-net"
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vpn.bridgeDevice
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] ++ lib.flatten (builtins.map (addr: [
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"--sane-sandbox-dns"
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addr
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]) vpn.dns);
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sandboxFlags = [
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"--sane-sandbox-method" method
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] ++ allowPaths allowedRootPaths
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++ allowHomePaths allowedHomePaths
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++ lib.optionals (vpn != null) vpnItems;
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# two ways i could wrap a package in a sandbox:
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# 1. package.overrideAttrs, with `postFixup`.
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# 2. pkgs.symlinkJoin, or pkgs.runCommand, creating an entirely new package which calls into the inner binaries.
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#
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# no.2 would require special-casing for .desktop files, to ensure they refer to the jailed version.
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# no.1 may require extra care for recursive binaries, or symlink-heavy binaries (like busybox)
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# but even no.2 has to consider such edge-cases, just less frequently.
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# no.1 may bloat rebuild times.
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#
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# ultimately, no.1 is probably more reliable, but i expect i'll factor out a switch to allow either approach -- particularly when debugging package buld failures.
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package' = if package.override.__functionArgs ? runCommand then
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package.override {
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runCommand = name: env: cmd: runCommand name env (cmd + lib.optionalString (name == package.name) ''
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# if the package is a runCommand (common for wrappers), then patch it to call our `postFixup` hook, first
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runHook postFixup
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'');
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}
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else
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package
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;
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packageWrapped = package'.overrideAttrs (unwrapped: {
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postFixup = (unwrapped.postFixup or "") + ''
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getProfileFromBinMap() {
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case "$1" in
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${builtins.concatStringsSep "\n" (lib.mapAttrsToList
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(bin: profile: ''
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(${bin})
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echo "${profile}"
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;;
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'')
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binMap
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)}
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(*)
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;;
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esac
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}
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sandboxWrap() {
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_name="$1"
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_profileFromBinMap="$(getProfileFromBinMap $_name)"
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_profiles=("$_profileFromBinMap" "$_name" "${pkgName}" "${unwrapped.pname or ""}" "${unwrapped.name or ""}")
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# filter to just the unique profiles
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_profileArgs=()
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for _profile in "''${_profiles[@]}"; do
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if [ -n "$_profile" ] && ! [[ " ''${_profileArgs[@]} " =~ " $_profile " ]]; then
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_profileArgs+=("--sane-sandbox-profile" "$_profile")
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fi
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done
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mv "$out/bin/$_name" "$out/bin/.$_name-sandboxed"
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cat <<EOF >> "$out/bin/$_name"
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#!${runtimeShell}
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exec ${sane-sandboxed'} \
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''${_profileArgs[@]} \
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"$out/bin/.$_name-sandboxed" "\$@"
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EOF
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chmod +x "$out/bin/$_name"
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}
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for _p in $(ls "$out/bin/"); do
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sandboxWrap "$_p"
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done
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'';
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meta = (unwrapped.meta or {}) // {
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# take precedence over non-sandboxed versions of the same binary.
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priority = ((unwrapped.meta or {}).priority or 0) - 1;
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};
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passthru = (unwrapped.passthru or {}) // {
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checkSandboxed = runCommand "${pkgName}-check-sandboxed" {} ''
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# invoke each binary in a way only the sandbox wrapper will recognize,
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# ensuring that every binary has in fact been wrapped.
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_numExec=0
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for b in ${packageWrapped}/bin/*; do
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PATH="$PATH:${packageWrapped}/bin:${sane-sandboxed}/bin" "$b" --sane-sandbox-method exit0fortest | grep "exiting 0 for test"
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_numExec=$(( $_numExec + 1 ))
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done
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echo "successfully tested $_numExec binaries"
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test "$_numExec" -ne 0 && touch "$out"
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'';
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sandboxProfiles = writeTextFile {
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name = "${pkgName}-sandbox-profiles";
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destination = "/share/sane-sandboxed/profiles/${pkgName}.profile";
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text = builtins.concatStringsSep "\n" sandboxFlags;
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};
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};
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});
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in
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packageWrapped
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