ZacharyZhang-NY/omarchycn
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Match sshd -T keywords case-insensitively when verifying hardening

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OpenSSH 10.x prints configuration keywords in CamelCase in its sshd -T
dump, where 9.x printed them lowercase. The case-sensitive grep in
omarchy-setup-security-sshd therefore never matched on OpenSSH 10.x, so
the hardening drop-in was always judged ineffective and removed, leaving
password authentication enabled.
This commit is contained in:
Ryan Hughes
2026-08-30 15:03:06 -04:00
parent 4271b880c3
commit 71d7ac81ae
2 changed files with 18 additions and 4 deletions
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bin/omarchy-setup-security-sshd
+4 -2
View File
@@ -172,9 +172,11 @@ CONF
# Syntax alone is insufficient because sshd uses the first value it reads for
# these settings. An earlier administrator rule could leave passwords enabled.
# Match keywords case-insensitively: OpenSSH 9.x dumps them lowercase, 10.x
# in CamelCase.
if ! effective_config=$(sudo sshd -T) ||
! grep -qxF "passwordauthentication no" <<<"$effective_config" ||
! grep -qxF "kbdinteractiveauthentication no" <<<"$effective_config"; then
! grep -qixF "passwordauthentication no" <<<"$effective_config" ||
! grep -qixF "kbdinteractiveauthentication no" <<<"$effective_config"; then
echo -e "\e[31msshd did not apply the password-authentication restrictions; removing the ineffective config.\e[0m" >&2
sudo rm -f "$config"
return 1
test/shell.d/setup-security-sshd-test.sh
+14 -2
View File
@@ -29,8 +29,14 @@ case $1 in
[[ ${SSHD_SYNTAX_VALID:-1} == 1 ]]
;;
-T)
printf 'passwordauthentication %s\n' "${SSHD_PASSWORD_AUTH:-no}"
printf 'kbdinteractiveauthentication %s\n' "${SSHD_KBD_AUTH:-no}"
# OpenSSH 10.x dumps keywords in CamelCase; 9.x dumped them lowercase.
if [[ ${SSHD_DUMP_LOWERCASE:-0} == 1 ]]; then
printf 'passwordauthentication %s\n' "${SSHD_PASSWORD_AUTH:-no}"
printf 'kbdinteractiveauthentication %s\n' "${SSHD_KBD_AUTH:-no}"
else
printf 'PasswordAuthentication %s\n' "${SSHD_PASSWORD_AUTH:-no}"
printf 'KbdInteractiveAuthentication %s\n' "${SSHD_KBD_AUTH:-no}"
fi
;;
*)
exit 2
@@ -82,6 +88,12 @@ grep -qxF "systemctl reload sshd.service" "$test_dir/success.calls" || fail "SSH
grep -q "Password logins are off" <<<"$output" || fail "SSH setup reports hardening after it succeeds"
pass "SSH setup authorizes a key and disables password logins"
output=$(SSHD_DUMP_LOWERCASE=1 run_setup success-legacy)
config="$test_dir/success-legacy/root/etc/ssh/sshd_config.d/10-omarchy-hardening.conf"
[[ -e $config ]] || fail "SSH setup accepts the lowercase sshd -T dump of OpenSSH 9.x"
grep -q "Password logins are off" <<<"$output" || fail "SSH setup reports hardening on OpenSSH 9.x"
pass "SSH setup verifies settings across sshd -T keyword casings"
if SSHD_PASSWORD_AUTH=yes run_setup ineffective >"$test_dir/ineffective.output" 2>&1; then
fail "SSH setup must fail when password authentication remains effective"
fi