536 lines
18 KiB
Bash
Executable File
536 lines
18 KiB
Bash
Executable File
#!/bin/bash -p
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# omarchy:summary=Toggle passwordless sudo for the current user.
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# omarchy:args=[MINUTES]
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# omarchy:requires-sudo=true
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if [[ $- != *p* && ${BASH_SOURCE[0]} == "$0" ]]; then
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echo "Refusing an unsafe Bash startup for passwordless sudo." >&2
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exit 126
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fi
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security_entrypoint=$(/usr/bin/readlink -e -- "${BASH_SOURCE[0]}") || exit 126
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source "${security_entrypoint%/*}/omarchy-security-functions" || exit 126
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if [[ ${BASH_SOURCE[0]} == "$0" ]]; then
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omarchy_security_require_privileged_bash_startup || {
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echo "Refusing an unsafe Bash startup for passwordless sudo." >&2
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exit 126
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}
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omarchy_security_sanitize_bash_environment "$0" "$@" || exit 126
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fi
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set -euo pipefail
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readonly DEFAULT_MINUTES=15
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readonly MAX_MINUTES=1440
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readonly STATE_DIR=/var/lib/omarchy/sudo-passwordless
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readonly RUNTIME_DIR=/run/omarchy/sudo-passwordless
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readonly LOCK_FILE=/run/lock/omarchy-sudo-passwordless.lock
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readonly BOOT_CLEANUP_FILE=/etc/tmpfiles.d/omarchy-nopasswd-sudo.conf
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readonly REMOVAL_BLOCKER=/run/omarchy-sudo-passwordless-package-removing
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readonly INSTALLED_SELF=/usr/bin/omarchy-sudo-passwordless
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readonly STATUS_INACTIVE=3
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usage() {
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echo "Usage: omarchy-sudo-passwordless [MINUTES]" >&2
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echo "MINUTES must be between 1 and $MAX_MINUTES." >&2
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exit 1
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}
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valid_minutes() {
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[[ $1 =~ ^0*[1-9][0-9]{0,3}$ ]] && ((10#$1 <= MAX_MINUTES))
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}
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valid_uid() {
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[[ $1 =~ ^0*[1-9][0-9]{0,9}$ ]] && ((10#$1 <= 4294967294))
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}
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valid_account_name() {
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[[ $1 =~ ^[a-z_][a-z0-9_-]{0,31}\$?$ ]] && (( ${#1} <= 32 ))
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}
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resolve_account() {
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local uid="$1" entry
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valid_uid "$uid" || return 1
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entry=$(/usr/bin/getent passwd "$((10#$uid))") || return 1
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IFS=: read -r ACCOUNT_NAME _ ACCOUNT_UID _ _ _ _ <<<"$entry"
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[[ $ACCOUNT_UID == "$((10#$uid))" ]] || return 1
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# Sudoers names and the legacy filename both have metacharacters. Omarchy
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# accounts use this portable subset; refusing anything else is safer than
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# attempting to quote privileged policy syntax.
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valid_account_name "$ACCOUNT_NAME" || return 1
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ACCOUNT_UID=$((10#$uid))
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}
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verify_sudo_caller() {
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local requested_uid="$1"
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((EUID == 0)) || return 1
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valid_uid "$requested_uid" || return 1
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[[ ${SUDO_UID:-} =~ ^[0-9]+$ ]] || return 1
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((10#$SUDO_UID == 10#$requested_uid)) || return 1
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resolve_account "$requested_uid"
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}
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prepare_root_state() {
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omarchy_security_assert_root_directory /var 755 || return 1
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[[ -d /var/lib && ! -L /var/lib ]] || return 1
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[[ $(/usr/bin/stat -Lc '%u' /var/lib) == 0 ]] || return 1
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! ((8#$(/usr/bin/stat -Lc '%a' /var/lib) & 022)) || return 1
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if [[ ! -e /var/lib/omarchy && ! -L /var/lib/omarchy ]]; then
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/usr/bin/install -d -o root -g root -m 0755 /var/lib/omarchy || return 1
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fi
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omarchy_security_assert_root_directory /var/lib/omarchy 755 || return 1
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omarchy_security_prepare_private_root_directory "$STATE_DIR" /var/lib/omarchy || return 1
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omarchy_security_assert_root_directory /run 755 || return 1
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if [[ ! -e /run/omarchy && ! -L /run/omarchy ]]; then
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/usr/bin/install -d -o root -g root -m 0755 /run/omarchy || return 1
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fi
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omarchy_security_assert_root_directory /run/omarchy 755 || return 1
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omarchy_security_prepare_private_root_directory "$RUNTIME_DIR" /run/omarchy
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}
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with_root_lock() {
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local fd rc=0
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# The boot cleanup cannot depend on STATE_DIR or RUNTIME_DIR being healthy:
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# those are exactly the kinds of partial-install state it must fail closed
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# through. /run/lock is established by the OS before sysinit services run.
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omarchy_security_assert_root_directory /run 755 || return 1
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[[ -d /run/lock && ! -L /run/lock ]] || return 1
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[[ $(/usr/bin/stat -Lc '%u' /run/lock) == 0 ]] || return 1
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! ((8#$(/usr/bin/stat -Lc '%a' /run/lock) & 022)) || return 1
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exec {fd}>"$LOCK_FILE" || return 1
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/usr/bin/chown root:root "$LOCK_FILE" || return 1
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/usr/bin/chmod 0600 "$LOCK_FILE" || return 1
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/usr/bin/flock -x "$fd" || return 1
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"$@" || rc=$?
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/usr/bin/flock -u "$fd" || rc=1
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exec {fd}>&-
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return "$rc"
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}
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rule_file() {
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printf '/etc/sudoers.d/99-omarchy-nopasswd-%s' "$1"
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}
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state_file() {
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printf '%s/%s.state' "$STATE_DIR" "$1"
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}
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read_state_record() {
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local uid="$1" file state_uid name expires timer canonical_uid
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local -a lines=()
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valid_uid "$uid" || return 1
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canonical_uid=$((10#$uid))
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file=$(state_file "$uid")
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[[ -f $file && ! -L $file ]] || return 1
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mapfile -t lines <"$file" || return 1
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(( ${#lines[@]} == 4 )) || return 1
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[[ ${lines[0]} == UID=* && ${lines[1]} == USER=* &&
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${lines[2]} == EXPIRES=* && ${lines[3]} == TIMER=* ]] || return 1
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state_uid=${lines[0]#UID=}
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name=${lines[1]#USER=}
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expires=${lines[2]#EXPIRES=}
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timer=${lines[3]#TIMER=}
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[[ $state_uid == "$canonical_uid" ]] || return 1
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valid_account_name "$name" || return 1
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[[ $expires =~ ^[1-9][0-9]{0,10}$ ]] || return 1
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[[ $timer =~ ^omarchy-nopasswd-expire-${canonical_uid}-[0-9a-f]{32}$ ]] || return 1
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printf '%s\t%s\t%s' "$name" "$expires" "$timer"
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}
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read_state_timer() {
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local record
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record=$(read_state_record "$1") || return 1
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printf '%s' "${record##*$'\t'}"
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}
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current_epoch() {
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local now
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now=$(/usr/bin/date +%s) || return 1
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[[ $now =~ ^[1-9][0-9]{0,10}$ ]] || return 1
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printf '%s' "$now"
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}
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valid_expiry() {
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[[ $1 =~ ^[1-9][0-9]{0,10}$ ]]
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}
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valid_timer_for_uid() {
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local uid="$1" timer="$2"
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valid_uid "$uid" || return 1
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uid=$((10#$uid))
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[[ $timer =~ ^omarchy-nopasswd-expire-${uid}-[0-9a-f]{32}$ ]]
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}
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stop_timer() {
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local timer="$1"
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[[ $timer =~ ^omarchy-nopasswd-expire-[0-9]+-[0-9a-f]{32}$ ]] || return 0
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/usr/bin/systemctl stop "${timer}.timer" "${timer}.service" >/dev/null 2>&1 || true
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/usr/bin/systemctl reset-failed "${timer}.timer" "${timer}.service" >/dev/null 2>&1 || true
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}
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classify_generated_rule() {
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local file=$1 suffix contents name
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GENERATED_RULE_LEGACY_TIMER=""
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[[ -f $file && ! -L $file ]] || return 1
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contents=$(/usr/bin/cat -- "$file") || return 2
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suffix=${file##*/99-omarchy-nopasswd-}
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if [[ $suffix =~ ^[0-9]+$ ]]; then
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name=${contents%' ALL=(ALL) NOPASSWD: ALL'}
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valid_account_name "$name" && [[ $contents == "$name ALL=(ALL) NOPASSWD: ALL" ]]
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elif valid_account_name "$suffix" && [[ $contents == "$suffix ALL=(ALL) NOPASSWD: ALL" ]]; then
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GENERATED_RULE_LEGACY_TIMER="omarchy-nopasswd-expire-${suffix}"
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else
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return 1
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fi
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}
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remove_known_legacy_rules() {
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local file classification failed=0
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shopt -s nullglob
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for file in /etc/sudoers.d/99-omarchy-nopasswd-*; do
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if classify_generated_rule "$file"; then
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# A crash after publishing the numeric rule but before its state rename
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# must not survive the next boot. Do not require the account to still
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# exist: a deleted account could otherwise make the rule immortal and a
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# later username reuse could activate it again.
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if /usr/bin/rm -f -- "$file" && [[ ! -e $file && ! -L $file ]]; then
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[[ -z $GENERATED_RULE_LEGACY_TIMER ]] ||
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/usr/bin/systemctl stop "${GENERATED_RULE_LEGACY_TIMER}.timer" \
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"${GENERATED_RULE_LEGACY_TIMER}.service" >/dev/null 2>&1 || true
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else
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failed=1
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fi
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else
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classification=$?
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# An unreadable candidate cannot be proven inert. A symlink, non-file,
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# or administrator-authored body is unrelated and remains untouched.
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(( classification == 1 )) || failed=1
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fi
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done
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shopt -u nullglob
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return "$failed"
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}
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cleanup_uid_locked() {
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local uid="$1" timer=""
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valid_uid "$uid" || return 1
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timer=$(read_state_timer "$uid" 2>/dev/null || true)
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# Remove policy first. A failed timer stop can only leave an inert cleanup
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# job behind, never extend passwordless access.
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/usr/bin/rm -f -- "$(rule_file "$uid")" || return 1
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[[ ! -e $(rule_file "$uid") && ! -L $(rule_file "$uid") ]] || return 1
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/usr/bin/rm -f -- "$(state_file "$uid")" || return 1
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[[ -z $timer ]] || stop_timer "$timer"
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}
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cleanup_all_locked() {
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local state uid failed=0 file classification
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shopt -s nullglob
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for state in "$STATE_DIR"/*.state; do
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uid=${state##*/}
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uid=${uid%.state}
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if valid_uid "$uid" && ! cleanup_uid_locked "$uid"; then failed=1; fi
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done
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shopt -u nullglob
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remove_known_legacy_rules || failed=1
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# Never report a successful boot cleanup while an exact rule emitted by any
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# Omarchy implementation is still active. Administrator-extended files do
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# not match these complete bodies and remain untouched.
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shopt -s nullglob
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for file in /etc/sudoers.d/99-omarchy-nopasswd-*; do
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if classify_generated_rule "$file"; then
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failed=1
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else
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classification=$?
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(( classification == 1 )) || failed=1
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fi
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done
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shopt -u nullglob
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return "$failed"
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}
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verify_boot_cleanup() {
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local owner mode canonical current active_rules
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[[ ! -e $REMOVAL_BLOCKER && ! -L $REMOVAL_BLOCKER ]] || return 1
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[[ -f $BOOT_CLEANUP_FILE && ! -L $BOOT_CLEANUP_FILE ]] || return 1
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canonical=$(/usr/bin/realpath -e -- "$BOOT_CLEANUP_FILE") || return 1
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[[ $canonical == "$BOOT_CLEANUP_FILE" ]] || return 1
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owner=$(/usr/bin/stat -Lc '%u' -- "$BOOT_CLEANUP_FILE") || return 1
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mode=$(/usr/bin/stat -Lc '%a' -- "$BOOT_CLEANUP_FILE") || return 1
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[[ $owner == 0 && $mode =~ ^[0-7]+$ ]] && ! ((8#$mode & 022)) || return 1
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current=${BOOT_CLEANUP_FILE%/*}
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while :; do
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[[ -d $current && ! -L $current ]] || return 1
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canonical=$(/usr/bin/realpath -e -- "$current") || return 1
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[[ $canonical == "$current" ]] || return 1
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read -r owner mode < <(/usr/bin/stat -Lc '%u %a' -- "$current") || return 1
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[[ $owner == 0 && $mode =~ ^[0-7]+$ ]] && ! ((8#$mode & 022)) || return 1
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[[ $current == / ]] && break
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current=${current%/*}
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[[ -n $current ]] || current=/
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done
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active_rules=$(/usr/bin/awk '!/^[[:space:]]*(#|$)/ { print }' "$BOOT_CLEANUP_FILE") || return 1
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[[ $active_rules == 'r! /etc/sudoers.d/99-omarchy-nopasswd-*' ]]
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}
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prepare_state_file() {
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local uid="$1" name="$2" expires="$3" timer="$4" tmp
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tmp=$(/usr/bin/mktemp "$STATE_DIR/.state.XXXXXX") || return 1
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if ! /usr/bin/printf 'UID=%s\nUSER=%s\nEXPIRES=%s\nTIMER=%s\n' \
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"$uid" "$name" "$expires" "$timer" >"$tmp" ||
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! /usr/bin/chown root:root "$tmp" || ! /usr/bin/chmod 0600 "$tmp"; then
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/usr/bin/rm -f -- "$tmp"
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return 1
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fi
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printf '%s' "$tmp"
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}
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start_expiry_timer() {
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local uid="$1" expires="$2" timer="$3"
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valid_uid "$uid" && valid_expiry "$expires" && valid_timer_for_uid "$uid" "$timer" || return 1
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# Calendar timers use CLOCK_REALTIME and catch up immediately after resume;
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# a monotonic OnActiveSec timer pauses while the machine is suspended.
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/usr/bin/systemd-run --quiet --collect --on-calendar="@${expires}" \
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--timer-property=AccuracySec=1s --unit="$timer" \
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-- "$INSTALLED_SELF" __expire "$uid" "$timer" || return 1
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/usr/bin/systemctl is-active --quiet "${timer}.timer"
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}
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publish_rule() {
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local uid="$1" name="$2" destination tmp
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destination=$(rule_file "$uid")
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tmp=$(/usr/bin/mktemp "$STATE_DIR/.sudoers.XXXXXX") || return 1
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if ! /usr/bin/printf '%s ALL=(ALL) NOPASSWD: ALL\n' "$name" >"$tmp" ||
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! /usr/bin/chown root:root "$tmp" || ! /usr/bin/chmod 0440 "$tmp" ||
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! /usr/sbin/visudo -cf "$tmp" >/dev/null ||
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! /usr/bin/install -o root -g root -m 0440 -- "$tmp" "$destination"; then
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/usr/bin/rm -f -- "$tmp"
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return 1
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fi
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/usr/bin/rm -f -- "$tmp"
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}
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abort_enable_locked() {
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local uid=$1 timer=$2 old_timer=$3 pending_state=$4
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# Publication can install policy and then fail while cleaning its temporary
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# file. Never disarm either expiry job until policy revocation is confirmed.
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if cleanup_uid_locked "$uid"; then
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stop_timer "$timer"
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[[ -z $old_timer ]] || stop_timer "$old_timer"
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else
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echo "Could not revoke passwordless sudo after a failed grant; expiry jobs remain armed. Administrator cleanup is required." >&2
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fi
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/usr/bin/rm -f -- "$pending_state" || true
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return 1
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}
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enable_locked() {
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local uid="$1" minutes="$2" old_timer="" timer token expires pending_state now
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resolve_account "$uid" || return 1
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valid_minutes "$minutes" || return 1
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prepare_root_state || return 1
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verify_boot_cleanup || {
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echo "omarchy-sudo-passwordless: package-owned boot cleanup rule is missing or unsafe" >&2
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return 1
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}
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old_timer=$(read_state_timer "$uid" 2>/dev/null || true)
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token=$(/usr/bin/tr -d '-' </proc/sys/kernel/random/uuid)
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[[ $token =~ ^[0-9a-f]{32}$ ]] || return 1
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timer="omarchy-nopasswd-expire-${uid}-${token}"
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now=$(current_epoch) || return 1
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expires=$((10#$now + 10#$minutes * 60))
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# State and a verified timer exist before the policy becomes reachable. If
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# publication fails, cleanup removes both. During an update the old timer is
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# deliberately kept until the replacement is active, so failure shortens the
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# grant rather than extending it.
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pending_state=$(prepare_state_file "$uid" "$ACCOUNT_NAME" "$expires" "$timer") || return 1
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if ! start_expiry_timer "$uid" "$expires" "$timer"; then
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abort_enable_locked "$uid" "$timer" "$old_timer" "$pending_state"
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return 1
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fi
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if ! /usr/bin/mv -fT -- "$pending_state" "$(state_file "$uid")"; then
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abort_enable_locked "$uid" "$timer" "$old_timer" "$pending_state"
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return 1
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fi
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if ! verify_boot_cleanup || ! publish_rule "$uid" "$ACCOUNT_NAME"; then
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abort_enable_locked "$uid" "$timer" "$old_timer" "$pending_state"
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return 1
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fi
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now=$(current_epoch) || {
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abort_enable_locked "$uid" "$timer" "$old_timer" "$pending_state"
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return 1
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}
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if ((10#$now >= 10#$expires)) || ! /usr/bin/systemctl is-active --quiet "${timer}.timer" || ! verify_boot_cleanup; then
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# The timer may have expired or failed between its initial verification and
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# rule publication. Revoke synchronously so a suspended or heavily loaded
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# machine cannot turn a short grant into a reboot-long one.
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abort_enable_locked "$uid" "$timer" "$old_timer" "$pending_state"
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return 1
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fi
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[[ -z $old_timer || $old_timer == "$timer" ]] || stop_timer "$old_timer"
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}
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status_locked() {
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local uid="$1" record state_name expires timer now remainder
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resolve_account "$uid" || return 2
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if [[ ! -e $(rule_file "$uid") && ! -L $(rule_file "$uid") ]]; then
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return "$STATUS_INACTIVE"
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fi
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record=$(read_state_record "$uid") || {
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revoke_inactive_grant "$uid"
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return $?
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}
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state_name=${record%%$'\t'*}
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remainder=${record#*$'\t'}
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expires=${remainder%%$'\t'*}
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timer=${record##*$'\t'}
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[[ $state_name == "$ACCOUNT_NAME" ]] || {
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revoke_inactive_grant "$uid"
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return $?
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}
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now=$(current_epoch) || {
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revoke_inactive_grant "$uid"
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return $?
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}
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((10#$now < 10#$expires)) || {
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revoke_inactive_grant "$uid"
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return $?
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}
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/usr/bin/systemctl is-active --quiet "${timer}.timer" || {
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revoke_inactive_grant "$uid"
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return $?
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}
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}
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revoke_inactive_grant() {
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if cleanup_uid_locked "$1"; then
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return "$STATUS_INACTIVE"
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else
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echo "Could not revoke invalid or expired passwordless sudo. Administrator cleanup is required." >&2
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return 2
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fi
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}
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expire_locked() {
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local uid=$1 timer=${2:-} current_timer status
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if [[ -n $timer ]]; then
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current_timer=$(read_state_timer "$uid" 2>/dev/null || true)
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# A delayed predecessor must not revoke a newer, independently timed grant.
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[[ -z $current_timer || $current_timer == "$timer" ]] || return 0
|
|
cleanup_uid_locked "$uid"
|
|
elif status_locked "$uid"; then
|
|
# Compatibility with already scheduled UID-only jobs: enforce the current
|
|
# grant's expiry instead of letting an old timer shorten its replacement.
|
|
return 0
|
|
else
|
|
status=$?
|
|
(( status == STATUS_INACTIVE ))
|
|
fi
|
|
}
|
|
|
|
root_dispatch() {
|
|
local action="$1"
|
|
shift
|
|
case "$action" in
|
|
__status)
|
|
(($# == 1)) && verify_sudo_caller "$1" || return 2
|
|
with_root_lock status_locked "$1"
|
|
;;
|
|
__enable)
|
|
(($# == 2)) && verify_sudo_caller "$1" && valid_minutes "$2" || return 1
|
|
with_root_lock enable_locked "$1" "$2"
|
|
;;
|
|
__disable)
|
|
(($# == 1)) && verify_sudo_caller "$1" || return 1
|
|
with_root_lock cleanup_uid_locked "$1"
|
|
;;
|
|
__expire)
|
|
(($# == 1 || $# == 2)) && ((EUID == 0)) && valid_uid "$1" || return 1
|
|
[[ -z ${2:-} ]] || valid_timer_for_uid "$1" "$2" || return 1
|
|
with_root_lock expire_locked "$@"
|
|
;;
|
|
__cleanup-all)
|
|
(($# == 0)) && ((EUID == 0)) || return 1
|
|
with_root_lock cleanup_all_locked
|
|
;;
|
|
*) return 1 ;;
|
|
esac
|
|
}
|
|
|
|
case "${1:-}" in
|
|
__status|__enable|__disable|__expire|__cleanup-all)
|
|
action=$1
|
|
shift
|
|
root_dispatch "$action" "$@"
|
|
exit
|
|
;;
|
|
esac
|
|
|
|
(($# <= 1)) || usage
|
|
minutes=${1:-$DEFAULT_MINUTES}
|
|
valid_minutes "$minutes" || usage
|
|
uid=$(/usr/bin/id -u)
|
|
valid_uid "$uid" || {
|
|
echo "omarchy-sudo-passwordless: cannot grant passwordless sudo to this account" >&2
|
|
exit 1
|
|
}
|
|
|
|
omarchy_security_sudo_supports_no_update || {
|
|
echo "This sudo does not support --no-update; refusing the passwordless-sudo workflow." >&2
|
|
exit 1
|
|
}
|
|
|
|
omarchy_security_install_sudo_cleanup_traps
|
|
/usr/bin/sudo -k >/dev/null 2>&1 || {
|
|
echo "Could not start from a cold sudo credential state." >&2
|
|
exit 1
|
|
}
|
|
|
|
echo "Toggle passwordless sudo..."
|
|
if /usr/bin/sudo -N -- "$INSTALLED_SELF" __status "$uid"; then
|
|
if (($# == 0)); then
|
|
/usr/bin/sudo -N -- "$INSTALLED_SELF" __disable "$uid"
|
|
echo "Passwordless sudo has been DISABLED. Sudo will require a password again."
|
|
else
|
|
/usr/bin/sudo -N -- "$INSTALLED_SELF" __enable "$uid" "$minutes"
|
|
echo "Passwordless sudo timer updated. It will automatically disable in ${minutes} minutes."
|
|
fi
|
|
else
|
|
status=$?
|
|
if (( status != STATUS_INACTIVE )); then
|
|
echo "Could not safely inspect passwordless sudo; no grant will be enabled. Resolve the reported authorization or cleanup error first." >&2
|
|
exit 1
|
|
fi
|
|
echo ""
|
|
echo "⚠️ WARNING: This will allow ANY process running as your user to"
|
|
echo "execute ANY command as root WITHOUT a password for ${minutes} minutes."
|
|
echo ""
|
|
echo "This is useful for AI agents that need to run sudo commands,"
|
|
echo "but it significantly weakens the security of your system."
|
|
echo "Anyone or anything with access to your user account gets full root."
|
|
echo ""
|
|
echo "Passwordless sudo will automatically disable after ${minutes} minutes,"
|
|
echo "including if the machine reboots before the timer fires."
|
|
echo "Run this command again to disable it early."
|
|
echo ""
|
|
|
|
if /usr/bin/gum confirm "Enable passwordless sudo for ${minutes} minutes? This is a significant security risk!"; then
|
|
/usr/bin/sudo -N -- "$INSTALLED_SELF" __enable "$uid" "$minutes"
|
|
echo ""
|
|
echo "Passwordless sudo has been ENABLED. It will automatically disable in ${minutes} minutes."
|
|
else
|
|
echo "Aborted. No changes made."
|
|
fi
|
|
fi
|