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Recommend that DS records be updated to not use SHA1 and exclude MUST NOT methods (SHA1) and the unlikely option RSASHA1-NSEC3-SHA1 (7) + SHA-384 (4) from the DS record suggestions

This commit is contained in:
Joshua Tauberer 2021-08-22 14:43:33 -04:00
parent 20ccda8710
commit 67b5711c68
1 changed files with 6 additions and 5 deletions
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11
management/status_checks.py
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@ -612,14 +612,14 @@ def check_dnssec(domain, env, output, dns_zonefiles, is_checking_primary=False):
# #
# But it may not be preferred. Only algorithm 13 is preferred. Warn if any of the # But it may not be preferred. Only algorithm 13 is preferred. Warn if any of the
# matched zones uses a different algorithm. # matched zones uses a different algorithm.
if set(r[1] for r in matched_ds) == { '13' }: # all are alg 13 if set(r[1] for r in matched_ds) == { '13' } and set(r[2] for r in matched_ds) <= { '2', '4' }: # all are alg 13 and digest type 2 or 4
output.print_ok("DNSSEC 'DS' record is set correctly at registrar.") output.print_ok("DNSSEC 'DS' record is set correctly at registrar.")
return return
elif '13' in set(r[1] for r in matched_ds): # some but not all are alg 13 elif len([r for r in matched_ds if r[1] == '13' and r[2] in ( '2', '4' )]) > 0: # some but not all are alg 13
output.print_ok("DNSSEC 'DS' record is set correctly at registrar. (Records using algorithm other than ECDSAP256SHA256 should be removed.)") output.print_ok("DNSSEC 'DS' record is set correctly at registrar. (Records using algorithm other than ECDSAP256SHA256 and digest types other than SHA-256/384 should be removed.)")
return return
else: # no record uses alg 13 else: # no record uses alg 13
output.print_warning("""DNSSEC 'DS' record set at registrar is valid but should be updated to ECDSAP256SHA256 (see below). output.print_warning("""DNSSEC 'DS' record set at registrar is valid but should be updated to ECDSAP256SHA256 and SHA-256 (see below).
IMPORTANT: Do not delete existing DNSSEC 'DS' records for this domain until confirmation that the new DNSSEC 'DS' record IMPORTANT: Do not delete existing DNSSEC 'DS' records for this domain until confirmation that the new DNSSEC 'DS' record
for this domain is valid.""") for this domain is valid.""")
else: else:
@ -632,7 +632,7 @@ def check_dnssec(domain, env, output, dns_zonefiles, is_checking_primary=False):
output.print_line("""Follow the instructions provided by your domain name registrar to set a DS record. output.print_line("""Follow the instructions provided by your domain name registrar to set a DS record.
Registrars support different sorts of DS records. Use the first option that works:""") Registrars support different sorts of DS records. Use the first option that works:""")
preferred_ds_order = [(7, 1), (8, 1), (13, 1), (7, 2), (8, 4), (13, 4), (8, 2), (13, 2)] # low to high preferred_ds_order = [(7, 2), (8, 4), (13, 4), (8, 2), (13, 2)] # low to high, see https://github.com/mail-in-a-box/mailinabox/issues/1998
def preferred_ds_order_func(ds_suggestion): def preferred_ds_order_func(ds_suggestion):
k = (int(ds_suggestion['alg']), int(ds_suggestion['digalg'])) k = (int(ds_suggestion['alg']), int(ds_suggestion['digalg']))
@ -641,6 +641,7 @@ def check_dnssec(domain, env, output, dns_zonefiles, is_checking_primary=False):
return -1 # index before first item return -1 # index before first item
output.print_line("") output.print_line("")
for i, ds_suggestion in enumerate(sorted(expected_ds_records.values(), key=preferred_ds_order_func, reverse=True)): for i, ds_suggestion in enumerate(sorted(expected_ds_records.values(), key=preferred_ds_order_func, reverse=True)):
if preferred_ds_order_func(ds_suggestion) == -1: continue # don't offer record types that the RFC says we must not offer
output.print_line("") output.print_line("")
output.print_line("Option " + str(i+1) + ":") output.print_line("Option " + str(i+1) + ":")
output.print_line("----------") output.print_line("----------")