add further checks and helpers

requirements.txt

@@ -0,0 +1 @@
+dnspython

validate-my-dns.py

@@ -8,6 +8,17 @@ import os
 import subprocess
 import json
 
+import dns.name
+import dns.query
+import dns.dnssec
+import dns.message
+import dns.resolver
+import dns.rdatatype
+
+# import errors so they could be try/catched
+import dns.exception
+import binascii
+
 REGISTRY_PATH = "../registry"
 
 # step1:
@@ -47,12 +58,14 @@ def get_domain_by_mntner(mntner):
                     # nserver is defined in this file
                     elif len(nserver) == 2:
                         if nserver[0] not in domains[domain_name]["nserver"]:
-                            domains[domain_name]["nserver"][nserver[0]] = [nserver[1]]
+                            domains[domain_name]["nserver"][nserver[0]] = [
+                                nserver[1]]
                         else:
-                            domains[domain_name]["nserver"][nserver[0]].append(nserver[1])
+                            domains[domain_name]["nserver"][nserver[0]].append(
+                                nserver[1])
 
                 elif line.startswith("ds-rdata:"):
-                    domains[domain_name]["ds-rdata"].append(line[20:])
+                    domains[domain_name]["ds-rdata"].append(line[20:].lower())
     # load inetnums
     for inetnum in inetnums_files:
         # temp variables in case there is no nserver
@@ -64,7 +77,8 @@ def get_domain_by_mntner(mntner):
                 line = line.replace("\n", "")
                 if line.startswith("cidr"):
                     line = line[20:]
-                    _domain_name = ".".join(line.split(".")[::-1]) + ".in-addr.arpa"
+                    _domain_name = ".".join(
+                        line.split(".")[::-1]) + ".in-addr.arpa"
                 elif line.startswith("nserver"):
                     nserver = line[20:].split(" ")
                     # handle edge case where
@@ -84,10 +98,11 @@ def get_domain_by_mntner(mntner):
                             _nserver[nserver[0]].append(nserver[1])
 
                 elif line.startswith("ds-rdata:"):
-                    _ds_rdata.append(line[20:])
+                    _ds_rdata.append(line[20:].lower())
         # if nserver list is not empty add the reverse to the domain list
         if not _nserver == {}:
-            domains[_domain_name] = {"nserver": _nserver, "ds-rdata":_ds_rdata}
+            domains[_domain_name] = {
+                "nserver": _nserver, "ds-rdata": _ds_rdata}
     # load inet6nums
     for inet6num in inet6nums_files:
         # temp variables in case there is no nserver
@@ -128,10 +143,11 @@ def get_domain_by_mntner(mntner):
                             _nserver[nserver[0]].append(nserver[1])
 
                 elif line.startswith("ds-rdata:"):
-                    _ds_rdata.append(line[20:])
+                    _ds_rdata.append(line[20:].lower())
         # if nserver list is not empty add the reverse to the domain list
         if not _nserver == {}:
-            domains[_domain_name] = {"nserver": _nserver, "ds-rdata":_ds_rdata}
+            domains[_domain_name] = {
+                "nserver": _nserver, "ds-rdata": _ds_rdata}
 
     # add entries from main domain, if the nserver doesn't have an ip address (like in inet(6)nums)
     for domain in domains:
@@ -143,41 +159,58 @@ def get_domain_by_mntner(mntner):
                     # check if the nserver is already in loaded database, starts with more specific
                     if ".".join(nserver.split(".")[-i:]) in domains:
                         try:
-                            domains[domain]["nserver"][nserver] = domains[".".join(nserver.split(".")[-i:])]["nserver"][nserver]
+                            domains[domain]["nserver"][nserver] = domains[".".join(
+                                nserver.split(".")[-i:])]["nserver"][nserver]
                         except KeyError:
                             # reaches here if the domain for the nserver specified in the inet{6}num/domain is found, but the nserver itself not.
-                            print(f"Warn: the nserver {nserver} specified in {domain} wasn't found")
+                            print(
+                                f"Warn: the nserver {nserver} specified in {domain} wasn't found")
                             break
 
-
-
     return domains
 
-def get_dnskey(domain, nserver=None):
+
+def get_dnskey(domain_name, nserver):
     """query dns server for DNSKEY"""
 
-    if not nserver:
+    try:
-        # drill: use DNSSEC, fallback to tcp, for $domain
+        request = dns.message.make_query(
-        drill_cmd = subprocess.Popen(
+            domain_name, dns.rdatatype.DNSKEY, want_dnssec=False)
-            ["drill", "-D", "-a", "DNSKEY", domain], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        response = dns.query.udp(request, nserver, timeout=2)
-    else:
+    except dns.exception.Timeout:
-        # drill: use DNSSEC, fallback to tcp, ask $nserver for $domain
+        print(f"WARN: querying {nserver} for {domain_name} timed out")
-        drill_cmd = subprocess.Popen(
+        return False
-            ["drill", "-D", "-a", "DNSKEY", f"@{nserver}", domain], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    except dns.query.UnexpectedSource as e:
-    # get the output of the drill command
+        print(f"ERROR: server replied with different different ip than requested: error: {e}")
-    lines = drill_cmd.communicate()[0].decode().split("\n")
+        return False
-    # filter out comments (;;) and empty lines
+    if response.rcode() != 0:
-    new_lines = []
+        # HANDLE QUERY FAILED (SERVER ERROR OR NO DNSKEY RECORD)
-    for line in lines:
+        print(
-        if line == "" or line.startswith(";;"):
+            f"WARN: query for a DNSKEY on {domain_name} failed on {nserver}, returncode: {response.rcode()}")
-            continue
+        return False
-        new_lines.append(line)
+    return [dnskey.to_text().split("IN DNSKEY ")[1] for dnskey in response.answer]
-    lines = new_lines
+    # if not nserver:
-    # split records into domain and key
+    #     # drill: use DNSSEC, fallback to tcp, for $domain
-    dnskeys = [[record.split("\t")[0], record.split("\t")[-1]]
+    #     drill_cmd = subprocess.Popen(
-               for record in lines]
+    #         ["drill", "-D", "-a", "DNSKEY", domain], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-    #print(len(dnskeys))
+    # else:
-    return dnskeys
+    #     # drill: use DNSSEC, fallback to tcp, ask $nserver for $domain
+    #     drill_cmd = subprocess.Popen(
+    #         ["drill", "-D", "-a", "DNSKEY", f"@{nserver}", domain], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    # # get the output of the drill command
+    # lines = drill_cmd.communicate()[0].decode().split("\n")
+    # # filter out comments (;;) and empty lines
+    # new_lines = []
+    # for line in lines:
+    #     if line == "" or line.startswith(";;"):
+    #         continue
+    #     new_lines.append(line)
+    # lines = new_lines
+    # # split records into domain and key
+    # dnskeys = [[record.split("\t")[0], record.split("\t")[-1]]
+    #            for record in lines]
+    # #print(len(dnskeys))
+    # return dnskeys
 # end_step1
 
 
@@ -263,55 +296,57 @@ def dnskey_to_ds(domain, dnskey):
 
 # step3: start: partially stolen from: https://stackoverflow.com/questions/26137036/programmatically-check-if-domains-are-dnssec-protected
 
+
 def check_dnssec(domain_name, domain_data):
-    import dns.name
-    import dns.query
-    import dns.dnssec
-    import dns.message
-    import dns.resolver
-    import dns.rdatatype
-    import dns.exception
 
     success = False
 
     no_ds_rdata = domain_data["ds-rdata"] == []
     if no_ds_rdata:
-        print(f"INFO: {domain_name} doesn't have ds-rdata configured, not checking it")
+        print(
+            f"INFO: {domain_name} doesn't have ds-rdata configured, not checking it")
 
     for nserver in domain_data["nserver"]:
 
         # if the nserver is not set (i.e. not loaded from other dns file or "wrong" fqdn)
         if domain_data["nserver"][nserver] == None:
-            print(f"INFO: ip address(es) for nserver '{nserver}' in '{domain_name}' isn't specified/loaded")
+            print(
+                f"INFO: ip address(es) for nserver '{nserver}' in '{domain_name}' isn't specified/loaded")
             continue
         for nsaddr in domain_data["nserver"][nserver]:
 
             # get SOA
-            request = dns.message.make_query(domain_name, dns.rdatatype.SOA,want_dnssec=False)
+            request = dns.message.make_query(
+                domain_name, dns.rdatatype.SOA, want_dnssec=False)
             try:
                 # send the query
                 dns.query.udp(request, nsaddr, timeout=2)
             # if it timed out: tell the user
             except dns.exception.Timeout:
-                print(f"WARN: querying {nserver} ({nsaddr}) for {domain_name} timed out")
+                print(
+                    f"WARN: querying {nserver} ({nsaddr}) for {domain_name} timed out")
                 continue
 
             if no_ds_rdata:
-                print(f"INFO: query for {domain_name} SOA on {nserver} ({nsaddr}) succeded, not checking DNSSEC")
+                print(
+                    f"INFO: query for {domain_name} SOA on {nserver} ({nsaddr}) succeded, not checking DNSSEC")
                 continue
             # get DNSKEY for zone
-            request = dns.message.make_query(domain_name, dns.rdatatype.DNSKEY,want_dnssec=True)
+            request = dns.message.make_query(
+                domain_name, dns.rdatatype.DNSKEY, want_dnssec=True)
             response = dns.query.udp(request, nsaddr, timeout=2)
 
             if response.rcode() != 0:
                 # HANDLE QUERY FAILED (SERVER ERROR OR NO DNSKEY RECORD)
-                print(f"WARN: query for a DNSKEY on {domain_name} failed on {nserver} ({nsaddr}), returncode: {response.rcode()}")
+                print(
+                    f"WARN: query for a DNSKEY on {domain_name} failed on {nserver} ({nsaddr}), returncode: {response.rcode()}")
                 continue
             # answer should contain two RRSET: DNSKEY and RRSIG(DNSKEY)
             answer = response.answer
             if len(answer) != 2:
                 # SOMETHING WENT WRONG
-                print(f"ERROR: query for a DNSKEY on {domain_name} failed on {nserver} ({nsaddr}), invalid answer length: {len(answer)}")
+                print(
+                    f"ERROR: query for a DNSKEY on {domain_name} failed on {nserver} ({nsaddr}), invalid answer length: {len(answer)}")
                 continue
             # the DNSKEY should be self signed, validate it
             name = dns.name.from_text(domain_name)
@@ -319,19 +354,23 @@ def check_dnssec(domain_name, domain_data):
                 # print(f"DEBUG: answer[0]: {answer[0]}")
                 # print(f"DEBUG: answer[1]: {answer[1]}")
                 try:
-                    dns.dnssec.validate(answer[0],answer[1],{name:answer[0]})
+                    dns.dnssec.validate(
+                        answer[0], answer[1], {name: answer[0]})
                 # it raises an AttributeError if the records are in the wrong order
                 except AttributeError as e:
-                    dns.dnssec.validate(answer[1],answer[0],{name:answer[0]})
+                    dns.dnssec.validate(
+                        answer[1], answer[0], {name: answer[0]})
 
             except dns.dnssec.ValidationFailure:
                 # BE SUSPICIOUS
-                print(f"WARN: DNSSEC validation failed on {domain_name} failed on {nserver} ({nsaddr}), answer: {answer}")
+                print(
+                    f"WARN: DNSSEC validation failed on {domain_name} failed on {nserver} ({nsaddr}), answer: {answer}")
             except AttributeError as e:
                 print(f"ERROR: {e}")
             else:
                 # WE'RE GOOD, THERE'S A VALID DNSSEC SELF-SIGNED KEY FOR example.com
-                print(f"INFO: DNSSEC validation succeded on {domain_name} failed on {nserver} ({nsaddr})")
+                print(
+                    f"INFO: DNSSEC validation succeded on {domain_name} failed on {nserver} ({nsaddr})")
                 success = True
 
         return success
@@ -341,14 +380,51 @@ def check_dnssec(domain_name, domain_data):
 
 def main(mntner):
 
+    # get all domains/inet(6)nums of the mntner
     domains = get_domain_by_mntner(mntner=mntner)
 
-    #with open("domains.tmp", "w") as domain_file:
-    #    json.dump(domains, domain_file, indent=4)
-    # print(domains)
-
     for domain_name in domains:
-        print(check_dnssec(domain_name, domains[domain_name]))
+        
+        # check if the domain doesn't have DS data
+        if domains[domain_name]["ds-rdata"] == []:
+            print(f"INFO: {domain_name} doens't have any ds-rdata specified")
+            continue
+
+        for nserver in domains[domain_name]["nserver"]:
+            # check for unset nserver ips -> dont check them
+            if domains[domain_name]["nserver"][nserver] == None:
+                continue
+            for ip in domains[domain_name]["nserver"][nserver]:
+                ds_candidates = []
+                # load DNSKEYs from nserver: if False something failed (timeout)
+                _keys = get_dnskey(domain_name, ip)
+                if _keys == False: continue
+                # convert all found keys to DS
+                for key in _keys:
+                    try:
+                        _ds_s = dnskey_to_ds(domain_name, key)
+                    except binascii.Error as e:
+                        print(f"ERROR: trying to convert '{key}' to DS failed: {e}")
+                        continue
+                    ds_candidates.extend(_ds_s)
+                found = False
+                # iterate over DS-rdata from the registry and check if they are found on the nserver
+                for ds in domains[domain_name]["ds-rdata"]:
+                    # print(ds)
+                    if ds in ds_candidates:
+                        found = True
+                # print(f"DEBUG: available: {domains[domain_name]['ds-rdata']}")
+                # print(f"DEBUG: generated: {ds_candidates}")
+                if found:
+                    print(
+                        f"INFO: correct ds-rdata specified and matching DNSKEY returned by {ip} for {domain_name}")
+                else:
+                    print(
+                        f"ERROR: invalid ds-rdata specified and matching DNSKEY returned by {ip} for {domain_name}")
+            # break
+
+        # print(check_dnssec(domain_name, domains[domain_name]))
+
 
 if __name__ == "__main__":
     if len(sys.argv) == 1: