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firejail: fix -overlay and -build functionality on NixOS

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- The `-overlay` flag runs the specified binary inside an OverlayFS,
  since the /nix store may be in a different mount point than the user
  home, this patch explicitly bind mounts it so it's available inside
  the overlay.

- profile builder: firejail provides facilities to build a new profiles.
  To do so, it execute the helper binary `fbuilder`, which in turn will
  execute firejail back with different options. This patch makes it use
  the binary available in PATH instead of the one produced at compile time.
  The compiled firejail binary doesn't have the necessary permissions,
  so the firejail NixOS module wraps it in a SUID wrapper available on
  PATH at runtime.

Signed-off-by: Roosembert Palacios <roosemberth@posteo.ch>
This commit is contained in:
Roosembert Palacios 2020-11-27 22:42:03 +01:00
parent 67d7a67179
commit 831c700c5d
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GPG key ID: CAAAECE5C2242BB7
3 changed files with 47 additions and 0 deletions
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9
pkgs/os-specific/linux/firejail/default.nix
View file

@ -20,6 +20,15 @@ stdenv.mkDerivation {
name = "${s.name}.tar.bz2";
};
patches = [
# Adds the /nix directory when using an overlay.
# Required to run any programs under this mode.
./mount-nix-dir-on-overlay.patch
# By default fbuilder hardcodes the firejail binary to the install path.
# On NixOS the firejail binary is a setuid wrapper available in $PATH.
./fbuilder-call-firejail-on-path.patch
];
prePatch = ''
# Allow whitelisting ~/.nix-profile
substituteInPlace etc/firejail.config --replace \

11
pkgs/os-specific/linux/firejail/fbuilder-call-firejail-on-path.patch Normal file
View file

@ -0,0 +1,11 @@
--- a/src/fbuilder/build_profile.c
+++ b/src/fbuilder/build_profile.c
@@ -67,7 +67,7 @@
errExit("asprintf");
char *cmdlist[] = {
- BINDIR "/firejail",
+ "firejail",
"--quiet",
"--noprofile",
"--caps.drop=all",

27
pkgs/os-specific/linux/firejail/mount-nix-dir-on-overlay.patch Normal file
View file

@ -0,0 +1,27 @@
--- a/src/firejail/fs.c
+++ b/src/firejail/fs.c
@@ -1143,6 +1143,16 @@
errExit("mounting /dev");
fs_logger("whitelist /dev");
+ // mount-bind /nix
+ if (arg_debug)
+ printf("Mounting /nix\n");
+ char *nix;
+ if (asprintf(&nix, "%s/nix", oroot) == -1)
+ errExit("asprintf");
+ if (mount("/nix", nix, NULL, MS_BIND|MS_REC, NULL) < 0)
+ errExit("mounting /nix");
+ fs_logger("whitelist /nix");
+
// mount-bind run directory
if (arg_debug)
printf("Mounting /run\n");
@@ -1201,6 +1211,7 @@
free(odiff);
free(owork);
free(dev);
+ free(nix);
free(run);
free(tmp);
}