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226 Commits

Author SHA1 Message Date
Simon Kelley
c49778df4a Update copyright notices. Happy new year! 2016-01-06 18:52:33 +00:00
Simon Kelley
1d03016bbc Split EDNS0 stuff into its own source file. 2015-12-21 14:17:06 +00:00
Simon Kelley
fa14bec83b Major tidy up of EDNS0 handling and computation/use of udp packet size. 2015-12-20 17:12:16 +00:00
Simon Kelley
dd4ad9ac7e Tweaks to EDNS0 handling in DNS replies. 2015-12-17 10:44:58 +00:00
Simon Kelley
93be5b1e02 Abandon caching RRSIGs and returning them from cache. 
The list of exceptions to being able to locally answer
cached data for validated records when DNSSEC data is requested
was getting too long, so don't ever do that. This means
that the cache no longer has to hold RRSIGS and allows
us to lose lots of code. Note that cached validated
answers are still returned as long as do=0
 2015-12-15 12:04:40 +00:00
Simon Kelley
90477fb794 Update list of subnet for --bogus-priv 
RFC6303 specifies & recommends following zones not be forwarded
to globally facing servers.
+------------------------------+-----------------------+
| Zone                         | Description           |
+------------------------------+-----------------------+
| 0.IN-ADDR.ARPA               | IPv4 "THIS" NETWORK   |
| 127.IN-ADDR.ARPA             | IPv4 Loopback NETWORK |
| 254.169.IN-ADDR.ARPA         | IPv4 LINK LOCAL       |
| 2.0.192.IN-ADDR.ARPA         | IPv4 TEST-NET-1       |
| 100.51.198.IN-ADDR.ARPA      | IPv4 TEST-NET-2       |
| 113.0.203.IN-ADDR.ARPA       | IPv4 TEST-NET-3       |
| 255.255.255.255.IN-ADDR.ARPA | IPv4 BROADCAST        |
+------------------------------+-----------------------+

Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
 2015-10-20 21:21:32 +01:00
Ed Bardsley
a7369bef8a Enhance --add-subnet to allow arbitary subnet addresses. 2015-08-05 21:17:18 +01:00
Simon Kelley
d2aa7dfbb6 Include 0.0.0.0/8 in DNS rebind checks. 2015-08-03 21:52:12 +01:00
Simon Kelley
06568c6636 Remove support for DNS Extended Label Types. 
The support was only partial, and the whole concept is
now deprecated in the standards.
 2015-05-15 20:43:48 +01:00
Simon Kelley
5d07d77e75 Fix buffer overflow introduced in 2.73rc6. 
Fix off-by-one in code which checks for over-long domain names
in received DNS packets. This enables buffer overflow attacks
which can certainly crash dnsmasq and may allow for arbitrary
code execution. The problem was introduced in commit b8f16556d,
release 2.73rc6, so has not escaped into any stable release.
Note that the off-by-one was in the label length determination,
so the buffer can be overflowed by as many bytes as there are
labels in the name - ie, many.

Thanks to Ron Bowes, who used lcmatuf's afl-fuzz tool to find
the problem.
 2015-05-15 18:13:06 +01:00
Simon Kelley
b059c96dc6 Check IPv4-mapped IPv6 addresses with --stop-rebind. 2015-05-08 20:25:51 +01:00
Simon Kelley
a77cec8d58 Handle UDP packet loss when fragmentation of large packets is broken. 2015-05-08 16:25:38 +01:00
Simon Kelley
2ed162ac20 Don't remove RRSIG RR from answers to ANY queries when the do bit is not set. 2015-04-28 21:26:35 +01:00
Simon Kelley
b8f16556d3 Tweaks to previous, DNS label charset commit. 2015-04-22 21:14:31 +01:00
Simon Kelley
cbe379ad6b Handle domain names with '.' or /000 within labels. 
Only in DNSSEC mode, where we might need to validate or store
such names. In none-DNSSEC mode, simply don't cache these, as before.
 2015-04-21 22:57:06 +01:00
Simon Kelley
ad4a8ff7d9 Fix crash on receipt of certain malformed DNS requests. 2015-04-09 21:48:00 +01:00
Simon Kelley
394ff492da Allow control characters in names in the cache, handle when logging. 2015-03-29 22:17:14 +01:00
Simon Kelley
1e153945de DNSSEC fix for non-ascii characters in labels. 2015-03-28 21:34:07 +00:00
Simon Kelley
aff3396280 Update copyrights for dawn of 2015. 2015-01-31 20:13:40 +00:00
Simon Kelley
ae4624bf46 Logs for DS records consistent. 2015-01-12 23:22:08 +00:00
Glen Huang
32fc6dbe03 Add --ignore-address option. 2014-12-27 15:28:12 +00:00
Simon Kelley
476693678e Eliminate IPv6 privacy addresses from --interface-name answers. 2014-12-17 12:41:56 +00:00
Simon Kelley
288df49c96 Fix bug when resulted in NXDOMAIN answers instead of NODATA. 
check_for_local_domain() was broken due to new code matching F_*
bits in cache entries for DNSSEC. Because F_DNSKEY | F_DS is
used to match RRSIG entries, cache_find_by_name() insists on an exact match
of those bits. So adding F_DS to the bits that check_for_local_domain()
sends to cache_find_by_name() won't result in DS records as well
as the others, it results in only DS records. Add a new bit, F_NSIGMATCH
which suitably changes the behaviour of cache_find_by_name().
 2014-09-18 21:55:27 +01:00
Simon Kelley
b7639d5815 Fix ipsets logging patch. 2014-03-29 09:20:07 +00:00
Wang Jian
49752b90d5 Log IPSET actions. 2014-03-28 20:52:47 +00:00
Simon Kelley
fec216df32 Cache stats availble in CHAOS .bind domain. 2014-03-27 20:54:34 +00:00
Andy
3e21a1a6fa Tidy uid defines. 2014-03-22 19:10:07 +00:00
Simon Kelley
03431d6373 Initialise uid when creating CNAME cache record. 2014-03-20 16:25:43 +00:00
Simon Kelley
3f7483e816 Handle integer overflow in uid counter. Fixes rare crashes in cache code. 2014-03-16 22:56:58 +00:00
Simon Kelley
29fe922b14 Can have local DS records (trust anchors). 2014-03-01 22:53:57 +00:00
Simon Kelley
d1fbb77e0f Don't cache secure replies which we've messsed with. 2014-03-01 20:08:58 +00:00
Simon Kelley
1fbe4d2f5f Tweak tuning params. 2014-03-01 20:03:47 +00:00
Simon Kelley
00a5b5d477 Check that unsigned replies come from unsigned zones if --dnssec-check-unsigned set. 2014-02-28 18:10:55 +00:00
Simon Kelley
b8eac19177 Negative caching for DS records. 2014-02-27 14:30:03 +00:00
Simon Kelley
613ad15d02 Strip DNSSEC RRs when query doesn't have DO bit set. 2014-02-25 23:02:28 +00:00
Simon Kelley
5107ace14a NSEC3 validation. First pass. 2014-02-23 10:48:32 +00:00
Simon Kelley
ee4158678a Use DS records as trust anchors, not DNSKEYs. 
This allows us to query for the root zone DNSKEY RRset and validate
it, thus automatically handling KSK rollover.
 2014-02-11 11:07:22 +00:00
Simon Kelley
83349b8aa4 Further tidying of AD and DO bit handling. 2014-02-10 21:02:01 +00:00
Simon Kelley
c8ca33f810 Fix DNSSEC caching problems: incomplete RRSIG RRsets. 2014-02-10 10:35:42 +00:00
Simon Kelley
e243c072b5 AD bit in queries handled as RFC6840 p5.7 2014-02-06 18:14:09 +00:00
Simon Kelley
610e782a29 Fix stack-smashing crash in DNSSEC. Thanks to Henk Jan Agteresch. 2014-02-06 14:45:17 +00:00
Simon Kelley
12fae49fff Make RR work when returning A/AAAA records and an RRSIG. 2014-02-04 22:03:06 +00:00
Simon Kelley
5f938534a9 Return configured DNSKEYs even though we don't have RRSIGS for them. 2014-02-03 16:44:32 +00:00
Simon Kelley
7c28612a59 Trivial format fix. 2014-01-27 21:38:11 +00:00
Simon Kelley
6938f3476e Don't mark answers as DNSEC validated if DNS-doctored. 2014-01-26 22:47:39 +00:00
Simon Kelley
17fb9ea763 Exclude CRC code in DNSSEC build - replaced with SHA1. 2014-01-26 09:36:54 +00:00
Simon Kelley
c92f0083a2 Get AA flag right in DNSSEC answers from cache. 2014-01-25 18:43:59 +00:00
Simon Kelley
b5dbfd142a RRSIG answer logging. 2014-01-25 18:19:51 +00:00
Simon Kelley
5b3bf92101 --dnssec-debug 2014-01-25 17:03:07 +00:00
Simon Kelley
0744ca66ad More DNSSEC caching logic, and avoid repeated validation of DS/DNSKEY 2014-01-25 16:40:15 +00:00