daemon/lua/trust_anchors: don't crash when dealing with unknown algorhitm

diff --git a/daemon/lua/trust_anchors.lua.in b/daemon/lua/trust_anchors.lua.in
index 2497fbcb8762c92b8841c26246bfbb52d9ea3b0f..ca4d221a610323228397b0fe929ce2a9165bbf3d 100644 (file)
--- a/daemon/lua/trust_anchors.lua.in
+++ b/daemon/lua/trust_anchors.lua.in
@@ -201,12 +201,16 @@ local function ta_present(keyset, rr, hold_down_time, force_valid)
        if rr.type == kres.type.DNSKEY and not C.kr_dnssec_key_ksk(rr.rdata) then
                return false -- Ignore
        end
+    -- Attempt to extract key_tag
+       local key_tag = C.kr_dnssec_key_tag(rr.type, rr.rdata, #rr.rdata)
+    if key_tag < 0 or key_tag > 65535 then
+        warn(string.format('[ ta ] ignoring invalid or unsupported RR: %s: %s',
+            kres.rr2str(rr), ffi.string(C.knot_strerror(key_tag))))
+        return false
+    end
        -- Find the key in current key set and check its status
        local now = os.time()
        local key_revoked = (rr.type == kres.type.DNSKEY) and C.kr_dnssec_key_revoked(rr.rdata)
-       local key_tag = C.kr_dnssec_key_tag(rr.type, rr.rdata, #rr.rdata)
-       assert(key_tag >= 0 and key_tag <= 65535, string.format('invalid RR: %s: %s',
-              kres.rr2str(rr), ffi.string(C.knot_strerror(key_tag))))
        local ta = ta_find(keyset, rr)
        if ta then
                -- Key reappears (KeyPres)