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Block any DNS queries from student machines that aren't A, AAAA or CNAME #148

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Block any DNS queries from student machines that aren't A, AAAA or CNAME #148

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6 changes: 5 additions & 1 deletion packages/ytl-linux-digabi2-examnet/templates/dnsmasq@lan.conf.template
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Expand Up @@ -33,10 +33,14 @@ ${ALLOWLISTED_IPSET_CONFIGURATION}

# Null-route all other traffic
# This prevents software on the student computer from getting confused by when DNS queries work, but the TCP
# request stalls (since this is not a router) for however long the client timeout is set to; possibly Infinity
# request stalls for however long the client timeout is set to; possibly Infinity
address=/#/0.0.0.0
address=/#/::

# Allow only A, AAAA, CNAME and MX lookups
# Taken from https://en.wikipedia.org/wiki/List_of_DNS_record_types
filter-rr=AFSDB,APL,CAA,CDNSKEY,CDS,CERT,CSYNC,DHCID,DLV,DNAME,DNSKEY,DS,EUI48,EUI64,HINFO,HIP,HTTPS,IPSECKEY,KEY,KX,LOC,MX,NAPTR,NS,NSEC,NSEC3,NSEC3PARAM,PTR,RP,RRSIG,SIG,SMIMEA,SOA,SRV,SSHFP,SVCB,TA,TKEY,TLSA,TSIG,TXT,URI,ZONEMD,AXFR,IXFR,OPT

# Reduce DNS cache TTLs as Microsoft has very short TTL for the A records of the allowlisted servers
max-cache-ttl=5
max-ttl=5