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nix-config-ryan4yin/hardening/bwraps/wechat.nix

100 lines
3.3 KiB
Nix

# - wechat's flatpak manifest: https://github.com/flathub/com.tencent.WeChat/blob/master/com.tencent.WeChat.yaml
# Refer:
# - Flatpak manifest's docs:
# - https://docs.flatpak.org/en/latest/manifests.html
# - https://docs.flatpak.org/en/latest/sandbox-permissions.html
#
# TODO Since appimageTools.wrapAppImage do not support overriding, I have to pack this package myself.
# https://github.com/NixOS/nixpkgs/pull/358977
{
appimageTools,
fetchurl,
stdenvNoCC,
}:
let
pname = "wechat";
# https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/by-name/we/wechat/package.nix
sources = {
aarch64-linux = {
version = "4.0.1.11";
src = fetchurl {
url = "https://web.archive.org/web/20250512112413if_/https://dldir1v6.qq.com/weixin/Universal/Linux/WeChatLinux_arm64.AppImage";
hash = "sha256-Rg+FWNgOPC02ILUskQqQmlz1qNb9AMdvLcRWv7NQhGk=";
};
};
x86_64-linux = {
version = "4.0.1.11";
src = fetchurl {
url = "https://web.archive.org/web/20250512110825if_/https://dldir1v6.qq.com/weixin/Universal/Linux/WeChatLinux_x86_64.AppImage";
hash = "sha256-gBWcNQ1o1AZfNsmu1Vi1Kilqv3YbR+wqOod4XYAeVKo=";
};
};
};
inherit (stdenvNoCC.hostPlatform) system;
inherit (sources.${system} or (throw "Unsupported system: ${system}")) version src;
# https://github.com/NixOS/nixpkgs/blob/master/pkgs/by-name/we/wechat/linux.nix
appimageContents = appimageTools.extract {
inherit pname version src;
postExtract = ''
patchelf --replace-needed libtiff.so.5 libtiff.so $out/opt/wechat/wechat
'';
};
in
appimageTools.wrapAppImage {
inherit pname version;
src = appimageContents;
extraInstallCommands = ''
mkdir -p $out/share/applications
cp ${appimageContents}/wechat.desktop $out/share/applications/
mkdir -p $out/share/pixmaps
cp ${appimageContents}/wechat.png $out/share/pixmaps/
substituteInPlace $out/share/applications/wechat.desktop --replace-fail AppRun wechat
'';
# Add these root paths to FHS sandbox to prevent WeChat from accessing them by default
# Adapted from https://aur.archlinux.org/cgit/aur.git/tree/wechat-universal.sh?h=wechat-universal-bwrap
extraPreBwrapCmds = ''
XDG_DOCUMENTS_DIR="''${XDG_DOCUMENTS_DIR:-$(xdg-user-dir DOCUMENTS)}"
if [[ -z "''${XDG_DOCUMENTS_DIR}" ]]; then
echo 'Error: Failed to get XDG_DOCUMENTS_DIR, refuse to continue'
exit 1
fi
WECHAT_DATA_DIR="''${XDG_DOCUMENTS_DIR}/WeChat_Data"
# Using ''${WECHAT_DATA_DIR} as Wechat Data folder
WECHAT_HOME_DIR="''${WECHAT_DATA_DIR}/home"
WECHAT_FILES_DIR="''${WECHAT_DATA_DIR}/xwechat_files"
mkdir -p "''${WECHAT_FILES_DIR}"
mkdir -p "''${WECHAT_HOME_DIR}"
ln -snf "''${WECHAT_FILES_DIR}" "''${WECHAT_HOME_DIR}/xwechat_files"
'';
extraBwrapArgs = [
"--tmpfs /home"
"--tmpfs /root"
# format: --bind <host-path> <sandbox-path>
"--bind \${WECHAT_HOME_DIR} \${HOME}"
"--bind \${WECHAT_FILES_DIR} \${WECHAT_FILES_DIR}"
"--chdir \${HOME}"
# wechat-universal only supports xcb
"--setenv QT_QPA_PLATFORM xcb"
"--setenv QT_AUTO_SCREEN_SCALE_FACTOR 1"
# use fcitx as IME
"--setenv QT_IM_MODULE fcitx"
"--setenv GTK_IM_MODULE fcitx"
];
chdirToPwd = false;
unshareNet = false;
unshareIpc = true;
unsharePid = true;
unshareUts = true;
unshareCgroup = true;
privateTmp = true;
}