fix(host112): verify exact nopasswd sudo entries

scripts/reboot-recovery/install-host112-guest-recovery.sh

@@ -162,12 +162,37 @@ resolve_target_user() {
   AUTH_FILE="${AUTH_DIR}/authorized_keys"
 }
 
-sudo_policy_allows() {
+sudo_policy_output_has_nopasswd_match() {
+  LC_ALL=C awk '
+    /^Sudoers entry:/ {
+      if (entry_nopasswd && entry_matched) found = 1
+      entry_nopasswd = 0
+      entry_matched = 0
+      next
+    }
+    /^[[:space:]]*Options:/ && /(^|[ ,])!authenticate([ ,]|$)/ {
+      entry_nopasswd = 1
+      next
+    }
+    /^[[:space:]]*Matched:/ {
+      entry_matched = 1
+      next
+    }
+    END {
+      if (entry_nopasswd && entry_matched) found = 1
+      exit(found ? 0 : 1)
+    }
+  '
+}
+
+sudo_policy_is_nopasswd() {
+  local policy_output
   if [ "${EUID:-$(id -u)}" -eq 0 ]; then
-    sudo -n -U "$TARGET_USER" -l "$@" >/dev/null 2>&1
+    policy_output="$(LC_ALL=C sudo -n -U "$TARGET_USER" -ll "$@" 2>/dev/null)" || return 1
   else
-    sudo -n -l "$@" >/dev/null 2>&1
+    policy_output="$(LC_ALL=C sudo -n -ll "$@" 2>/dev/null)" || return 1
   fi
+  printf '%s\n' "$policy_output" | sudo_policy_output_has_nopasswd_match
 }
 
 agent99_direct_authorization_ready() {
@@ -246,25 +271,25 @@ refresh_gate_state() {
     SUDOERS_VALID=1
   fi
   SUDO_CORRELATED_APPLY_NOPASSWD=0
-  if sudo_policy_allows "$READINESS_TARGET" --apply \
+  if sudo_policy_is_nopasswd "$READINESS_TARGET" --apply \
       --trace-id host112-policy-check \
       --run-id host112-policy-check \
       --work-item-id HOST112-WAZUH-MANAGER-RECOVERY; then
     SUDO_CORRELATED_APPLY_NOPASSWD=1
   fi
   SUDO_CORRELATED_DRY_RUN_NOPASSWD=0
-  if sudo_policy_allows "$READINESS_TARGET" --dry-run \
+  if sudo_policy_is_nopasswd "$READINESS_TARGET" --dry-run \
       --trace-id host112-policy-check \
       --run-id host112-policy-check \
       --work-item-id HOST112-WAZUH-MANAGER-RECOVERY; then
     SUDO_CORRELATED_DRY_RUN_NOPASSWD=1
   fi
   SUDO_LEGACY_UNCORRELATED_APPLY_NOPASSWD=0
-  if sudo_policy_allows "$READINESS_TARGET" --apply; then
+  if sudo_policy_is_nopasswd "$READINESS_TARGET" --apply; then
     SUDO_LEGACY_UNCORRELATED_APPLY_NOPASSWD=1
   fi
   SUDO_UNSAFE_IDENTITY_NOPASSWD=0
-  if sudo_policy_allows "$READINESS_TARGET" --apply \
+  if sudo_policy_is_nopasswd "$READINESS_TARGET" --apply \
       --trace-id 'unsafe value' \
       --run-id host112-policy-check \
       --work-item-id HOST112-WAZUH-MANAGER-RECOVERY; then

scripts/reboot-recovery/tests/test_install_host112_guest_recovery_contract.py

@@ -49,6 +49,54 @@ def test_sudo_policy_has_exact_correlated_apply_and_dry_run_only() -> None:
     assert 'SUDO_LEGACY_UNCORRELATED_APPLY_NOPASSWD' in text
     assert 'SUDO_UNSAFE_IDENTITY_NOPASSWD' in text
     assert 'SUDO_POLICY_READY' in text
+    assert 'sudo_policy_is_nopasswd' in text
+    assert 'Options:' in text
+    assert '!authenticate' in text
+
+
+def test_sudo_policy_parser_requires_nopasswd_and_match_in_same_entry() -> None:
+    text = source()
+    parser = text[
+        text.index("sudo_policy_output_has_nopasswd_match() {") : text.index(
+            "agent99_direct_authorization_ready() {"
+        )
+    ]
+    broad_password_rule = """Sudoers entry: /etc/sudoers
+    RunAsUsers: ALL
+    Commands:
+        ALL
+    Matched: /usr/local/sbin/readiness --apply
+"""
+    exact_nopasswd_rule = broad_password_rule + """Sudoers entry: /etc/sudoers.d/agent99
+    RunAsUsers: root
+    Options: !authenticate
+    Commands:
+        /usr/local/sbin/readiness ^--apply .*$
+    Matched: /usr/local/sbin/readiness --apply --trace-id safe
+"""
+    split_entry_false_positive = """Sudoers entry: /etc/sudoers.d/one
+    Options: !authenticate
+    Commands:
+        /usr/bin/true
+Sudoers entry: /etc/sudoers
+    Commands:
+        ALL
+    Matched: /usr/local/sbin/readiness --apply
+"""
+
+    def parse(sample: str) -> subprocess.CompletedProcess[str]:
+        return subprocess.run(
+            ["bash", "-c", parser + "\nsudo_policy_output_has_nopasswd_match"],
+            input=sample,
+            text=True,
+            capture_output=True,
+            check=False,
+            timeout=10,
+        )
+
+    assert parse(broad_password_rule).returncode != 0
+    assert parse(exact_nopasswd_rule).returncode == 0
+    assert parse(split_entry_false_positive).returncode != 0
 
 
 def test_windows99_direct_route_is_fingerprint_bound_and_not_forced() -> None: