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as_root(): Strict environment.

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Running a portion of the script as root will now use a stricter
environment. The root user will only inherit a small and fixed
white-list of environment variables.

- HOME/XDG_CACHE_HOME
  - To make use of the non-root user's package
    cache for the purposes of installation.

- KISS_PATH
  - To make use of the non-root user's set repositories
    during installation.

- KISS_FORCE
  - To carry over KISS_FORCE if passed as non-root.

The 'sudo' and 'su' commands were also changed to run as
"login shells". This allows environment variables to be set
solely for the root account (KISS_HOOK, etc) via '.profile' or
etc. As for 'doas', this has to happen via doas.conf.
This commit is contained in:
Dylan Araps 2020-05-18 10:29:25 +03:00
parent e711f76296
commit c55374a52b
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GPG Key ID: 46D62DD9F1DE636E
1 changed files with 11 additions and 12 deletions
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kiss
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@ -49,15 +49,18 @@ prompt() {
as_root() {
# Simple function to run a command as root using either 'sudo',
# 'doas' or 'su'. Hurrah for choice.
[ "$uid" = 0 ] || {
log "Using '${su:-su}' (to become ${user:=root})"
export KISS_AS_ROOT=1
}
[ "$uid" = 0 ] || log "Using '${su:-su}' (to become ${user:=root})"
# Add the following environment variables to the root environment
# so that the non-root user's cache can be used. This is the
# portable method of doing so and works across all tools.
set -- env HOME="$HOME" XDG_CACHE_HOME="$XDG_CACHE_HOME" \
KISS_PATH="$KISS_PATH" KISS_FORCE="$KISS_FORCE" "$@"
case $su in
*sudo) sudo -E -u "$user" -- "$@" ;;
*sudo) sudo -iu "$user" -- "$@" ;;
*doas) doas -u "$user" -- "$@" ;;
*) su -pc "$* <&3" "$user" 3<&0 </dev/tty ;;
*) su -lc "$* <&3" "$user" 3<&0 </dev/tty ;;
esac
}
@ -72,15 +75,11 @@ _tar() {
}
run_hook() {
# If we have elevated permissions from non-root to
# root, don't run the non-root user's KISS_HOOK.
[ "$KISS_AS_ROOT" != 1 ] || KISS_HOOK=/etc/kiss-hook
# Provide a default post-build hook to remove files
# and directories for things we don't support out of
# the box. One can simply define their own hook to
# override this behavior.
[ -f "${KISS_HOOK:-}" ] || {
[ "${KISS_HOOK:-}" ] || {
case $1 in post-build)
rm -rf "$3/usr/share/gettext"
rm -rf "$3/usr/share/polkit-1"