Hi George, I have been reading this page:
https://support.cloudflare.com/hc/en-us/articles/360021111972-Troubleshooting-DNSSEC Taking this error from the log file using Unbound V1.9.4: 03/10/2019 15:29:45 C:\Program Files\Unbound\unbound.exe[11788:0] info: validation failure <5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. A IN>: DS got unsigned CNAME answer from 2606:4700:4700::1001 and 1.0.0.1 for DS is-cf.cloudflareresolve.com. while building chain of trust ================================ There is no 'ad' flag present in the response so DNSSEC has failed using unbound and it returns no data hence the error message in the log file. C:\>dig 5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. +dnssec ; <<>> DiG 9.14.6 <<>> 5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. +dnssec ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 37604 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags: do; udp: 4096 ;; QUESTION SECTION: ;5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. IN A ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Oct 03 15:50:46 GMT Summer Time 2019 ;; MSG SIZE rcvd: 93 ================================ Using my ISP's router I get this returned with an NSEC record to say the name queried does not exist (have I got that correct?) C:\>dig @192.168.1.254 5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. +dnssec ; <<>> DiG 9.14.6 <<>> @192.168.1.254 5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. +dnssec ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10727 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; MBZ: 0x0384, udp: 4096 ;; QUESTION SECTION: ;5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. IN A ;; AUTHORITY SECTION: cloudflareresolve.com. 0 IN SOA cloudflareresolve.com. dns.cloudflare.com. 2018100101 21600 3600 604800 0 5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. 0 IN NSEC \000.5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. HINFO TXT AAAA LOC SRV CERT SSHFP RRSIG NSEC TLSA HIP OPENPGPKEY SPF cloudflareresolve.com. 0 IN RRSIG SOA 13 2 3600 20191011133931 20191003103931 64088 cloudflareresolve.com. ipLptq2Quw5wHXI5i09sydRWMJXiPVEP7F0jTuFsxvIYrgo/KW1mLbMV 30Iqokf79cF+Ruwhsg6D+cv+6klZ5A== 5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com. 0 IN RRSIG NSEC 13 4 3600 20191011144045 20191003114045 64088 cloudflareresolve.com. VChj42IfF+549QC1k/q8NJglytBVYZOXovTENcIqRQ5YWkvdrJrC+07a zvX7lcTeI092wIfYIHl6pImhKDABzA== ;; Query time: 152 msec ;; SERVER: 192.168.1.254#53(192.168.1.254) ;; WHEN: Thu Oct 03 15:52:24 GMT Summer Time 2019 ;; MSG SIZE rcvd: 473 ================================ The NSEC I think says remove the first subdomain (if doing a DNSSEC chain of trust walk) and try again. Repeat as many times as required. So, if I knock off the first part of the subdomain: 5a196f4c-afe8-442e-b258-ee7373f136a5 I get the same results If I then knock off the: is-cf I see this result: C:\>dig cloudflareresolve.com. +dnssec ; <<>> DiG 9.14.6 <<>> cloudflareresolve.com. +dnssec ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36595 ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags: do; udp: 4096 ;; QUESTION SECTION: ;cloudflareresolve.com. IN A ;; AUTHORITY SECTION: cloudflareresolve.com. 60 IN SOA cloudflareresolve.com. dns.cloudflare.com. 2018100101 21600 3600 604800 0 cloudflareresolve.com. 60 IN RRSIG SOA 13 2 3600 20191011133931 20191003103931 64088 cloudflareresolve.com. ipLptq2Quw5wHXI5i09sydRWMJXiPVEP7F0jTuFsxvIYrgo/KW1mLbMV 30Iqokf79cF+Ruwhsg6D+cv+6klZ5A== cloudflareresolve.com. 60 IN NSEC \000.cloudflareresolve.com. NS SOA HINFO MX TXT AAAA LOC SRV CERT SSHFP RRSIG NSEC DNSKEY TLSA HIP OPENPGPKEY SPF cloudflareresolve.com. 60 IN RRSIG NSEC 13 2 3600 20191011143217 20191003113217 64088 cloudflareresolve.com. +xoOFZv/dFhYHHrkzdZtCY2RXv3VKLXwrHkQcp2pQFuQQc49lgj7QIy4 WoD6OqvJy0oyRclznazLBpYu5kXNjQ== ;; Query time: 211 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Oct 03 15:57:09 GMT Summer Time 2019 ;; MSG SIZE rcvd: 387 Which does have the 'ad' flag set and unbound returns the data. The same is true for the ISP's router. So in this instance the domain name validates and therefore all is OK. Using: http://dnsviz.net/d/5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com/dnssec/ DNSSEC is validated and all looks just fine. The same is true for: https://dnssec-analyzer.verisignlabs.com/5a196f4c-afe8-442e-b258-ee7373f136a5.is-cf.cloudflareresolve.com These words I think explain what is happening: "Dig also retrieves the public key used to verify the DNS record. A domain's DNS records are all signed with the same public key. Therefore, query for the root domain's public key, not the subdomain's public key:" They are on this page (mentioned at the start): https://support.cloudflare.com/hc/en-us/articles/360021111972-Troubleshooting-DNSSEC So unless my reading and understanding of what should be happening is totally incorrect Unbound should be ignoring subdomains and tracking back to the actual domain name and if that validates then it should return the appropriate data. If I have this wrong then dnsviz and verisign should also fail the DNSSEC checks but they don’t appear to do so. Please let me know if I still have this all wrong and apologies if I have. Regards Ray -----Original Message----- From: [email protected] <[email protected]> Sent: 22 July 2019 18:15 To: 'George Thessalonikefs' <[email protected]>; '[email protected]' <[email protected]> Subject: RE: Using DNS over TLS on windows Hi George, Thanks for that (I hope) Having added that line into the configuration I see a different result. See the two attached images Not Active: # module-config: "iterator" - DNSSEC enabled Active : module-config: "iterator" - DNSSEC disabled In the config file. So if I leave DNSSEC enabled, whilst the test a https://1.1.1.1/help shows DOT is not enabled it is in fact all working OK as expected, is that correct? I just wanted to make sure I was understanding what is happening. So all in all I think I have it all working... Just as an aside Firefox (if you use that) does DOH directly to the cloudflare servers and that also works OK. Some other test servers that may be useful: https://rootcanary.org/test.html https://en.internet.nl/ https://www.dnsleaktest.com/ -----Original Message----- From: George Thessalonikefs <[email protected]> Sent: 22 July 2019 17:22 To: [email protected] Subject: Re: Using DNS over TLS on windows Hi Ray, It seems that cloudflare is using special subdomains (answered only from their 1.1.1.1 resolvers) for the online checks and they are not handling DNSSEC properly in regards to answers for these special subdomains. Unbound is complaining about not being able to build a trust chain because it can't get the DS information. I suspect that if you turn off DNSSEC validation on your unbound module-config: "iterator" the online check should work. Although I would advise to turn it on again after you do the online check. And just to be clear, this does not mean that 1.1.1.1 cannot do DNSSEC. I am only talking about the subdomains used for this specific online check. -- George On 22/07/2019 16:21, RayG via Unbound-users wrote: > Hi Yuri, > > > > OK I see what was happening now. I can use either > > > > tls-cert-bundle: ”<file>” > > or > > tls-win-cert: yes > > > > or both > > > > So now I can see: > > > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > SSL connection to cloudflare-dns.com authenticated ip4 1.0.0.1 port > 853 (len 16) > > > > So it looks like that bit is working OK but then when I go to: > > http://1.1.1.1/help > > to check that DNS over TLS is working it says “NO” > > > > Looking at the log file further I see this where things appear to be > blacklisted (see below) I have attached the log file and it is from > the start of the unbound service to the end of the query to > http://1.1.1.1/help I then stopped the unbound server to flush the log. > > > > Any further insights would be helpful, thanks > > > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > resolving > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. DS > IN > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > request has dependency depth of 0 > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > msg from cache lookup ;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, > id: 0 > > ;; flags: qr rd ra ; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 0 > > ;; QUESTION SECTION: > > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. > IN DS > > > > ;; ANSWER SECTION: > > > > ;; AUTHORITY SECTION: > > cloudflareresolve.com. 59 IN SOA > cloudflareresolve.com. dns.cloudflare.com. 2018100101 21600 3600 > 604800 0 > > cloudflareresolve.com. 59 IN RRSIG SOA 13 2 > 3600 > 20190730125237 20190722095237 64088 cloudflareresolve.com. > TQObnCdfCziZUkBWjUaAUFeU0iXbC7QK9tMC59qJqYZa8ntTdOHCmuWgUgRvVtaLK/l3Gh > Nk65Jr+wHzs3Qnhg== > ;{id = 64088} > > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. > 60 IN NSEC > \000.8946ae4B-99eC-4925-A951-078129AE2Afe.IS-cF.CLouDFlArerEsoLvE.Com. > A HINFO TXT AAAA LOC SRV CERT SSHFP RRSIG NSEC TLSA HIP OPENPGPKEY SPF > > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. > 60 IN RRSIG NSEC 13 4 3600 20190730135835 > 20190722105835 64088 cloudflareresolve.com. > 1EhhluR/cdwni2q9HCdPmAazhlq/rwiOPAWytdeR8pPcNLjlpwphAoULC0tZ2BSZw2UC3P > 6vlgTHruBL+jpTRQ== > ;{id = 64088} > > > > ;; ADDITIONAL SECTION: > > ;; MSG SIZE rcvd: 462 > > > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > msg ttl is 60, prefetch ttl 54 > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > returning answer from cache. > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > iter_handle processing q with state FINISHED RESPONSE STATE > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > finishing processing for > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. DS > IN > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > mesh_run: iterator module exit state is module_finished > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > validator[module 0] operate: extstate:module_wait_module > event:module_event_moddone > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > validator operate: query > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. DS > IN > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > validator: nextmodule returned > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > not validating response, is valrec(validation recursion lookup) > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > mesh_run: validator module exit state is module_finished > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > validator: inform_super, sub is > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. DS > IN > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > super is > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. A IN > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > NSEC RRset for the referral proved not a delegation point > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > validator[module 0] operate: extstate:module_wait_subquery > event:module_event_pass > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > validator operate: query > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. A IN > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > val handle processing q with state VAL_FINDKEY_STATE > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] info: > validator: FindKey > 8946ae4b-99ec-4925-a951-078129ae2afe.is-cf.cloudflareresolve.com. A IN > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > Cannot retrieve DS for signature > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > val handle processing q with state VAL_FINISHED_STATE > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > validation failed, blacklist and retry to fetch data > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > blacklist ip4 1.1.1.1 port 853 (len 16) > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > blacklist ip4 1.0.0.1 port 853 (len 16) > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > blacklist cache > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > blacklist ip6 2606:4700:4700::1001 port 853 (len 28) > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > blacklist add ip6 2606:4700:4700::1111 port 853 (len 28) > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > blacklist add ip6 2606:4700:4700::1111 port 853 (len 28) > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > pass back to next module > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > mesh_run: validator module exit state is module_restart_next > > 22/07/2019 14:58:35 C:\Program Files\Unbound\unbound.exe[13564:0] debug: > iterator[module 1] operate: extstate:module_finished > event:module_event_pass > > > > > > *From:*Yuri <[email protected]> > *Sent:* 22 July 2019 13:41 > *To:* [email protected]; [email protected] > *Subject:* Re: Using DNS over TLS on windows > > > > > > 22.07.2019 18:38, [email protected] <mailto:[email protected]> > пишет: > > Hi Yuri, > > > > Thanks for the config file very useful, but I still have the issue of: > > > > tls-cert-bundle: "C:\Squid\etc\squid\ca-bundle.crt" > > > > I do not have the file: "C:\Squid\etc\squid\ca-bundle.crt" on my system. > > Sure. This is my system-specific. :) > > In you case, you can download Mozilla's CA bundle from > > https://raw.githubusercontent.com/bagder/ca-bundle/master/ca-bundle.cr > t > > and use it on similar manner (just specify correct path-to-file) on > your setup. > > > > So my original question was were do I get that or a suitable file from? > > > > Regards > > Ray > > > > *From:*Yuri <[email protected]> <mailto:[email protected]> > *Sent:* 21 July 2019 19:51 > *To:* [email protected] <mailto:[email protected]> > *Subject:* Re: Using DNS over TLS on windows > > > > Just an example from working Windows setup: > > # Unbound configuration file on windows. > # See example.conf for more settings and syntax > > server: > # verbosity level 0-4 of logging > verbosity: 0 > > # if you want to log to a file use > # logfile: "C:\unbound.log" > > # on Windows, this setting makes reports go into the Application log > # found in ControlPanels - System tasks - Logs > use-syslog: yes > log-time-ascii: yes > num-threads: 4 > cache-max-ttl: 14400 > cache-min-ttl: 900 > cache-max-negative-ttl: 60 > infra-host-ttl: 60 > # root-hints: "C:\Program Files\Unbound\named.root" > hide-identity: yes > hide-version: yes > hide-trustanchor: yes > > do-ip6: no > > tls-cert-bundle: "C:\Squid\etc\squid\ca-bundle.crt" > tls-win-cert: yes > tcp-upstream: yes > > harden-short-bufsize: yes > harden-large-queries: yes > harden-below-nxdomain: yes > harden-algo-downgrade: yes > # 1.5.7 feature. Yes recommended. > # From 1.7.2 yes is default > #qname-minimisation: yes > aggressive-nsec: yes > > # select from the fastest servers this many times out of 1000. 0 > means > # the fast server select is disabled. prefetches are not sped up. > # fast-server-permil: 0 > fast-server-permil: 100 > # the number of servers that will be used in the fast server > selection. > # fast-server-num: 3 > fast-server-num: 4 > > unwanted-reply-threshold: 10000000 > do-not-query-localhost: no > prefetch: yes > prefetch-key: yes > rrset-roundrobin: yes > minimal-responses: yes > > access-control: 0.0.0.0/0 refuse > access-control: 127.0.0.0/8 allow_snoop > access-control: ::0/0 refuse > access-control: ::1 allow > access-control: ::ffff:127.0.0.1 allow > > #include: "C:\Program Files\Unbound\unbound_local" > include: "C:\Program Files\Unbound\unbound_ad_servers" > > # Remote control config section. > remote-control: > # Enable remote control with unbound-control(8) here. > # set up the keys and certificates with unbound-control-setup. > control-enable: yes > control-use-cert: no > > forward-zone: > name: "." > # forward-addr: 208.67.222.222@53 <mailto:208.67.222.222@53> > # forward-addr: 208.67.220.220@53 <mailto:208.67.220.220@53> > forward-addr: 1.1.1.1@853#cloudflare-dns.com > <mailto:1.1.1.1@853#cloudflare-dns.com> > forward-addr: 1.0.0.1@853#cloudflare-dns.com > <mailto:1.0.0.1@853#cloudflare-dns.com> > forward-addr: 9.9.9.9@853#dns.quad9.net > <mailto:9.9.9.9@853#dns.quad9.net> > forward-addr: 149.112.112.112@853#dns.quad9.net > <mailto:149.112.112.112@853#dns.quad9.net> > forward-addr: 145.100.185.15@443#dnsovertls.sinodun.com > <mailto:145.100.185.15@443#dnsovertls.sinodun.com> > forward-addr: 145.100.185.16@443#dnsovertls1.sinodun.com > <mailto:145.100.185.16@443#dnsovertls1.sinodun.com> > forward-addr: 185.49.141.37@853#getdnsapi.net > <mailto:185.49.141.37@853#getdnsapi.net> > forward-addr: 89.233.43.71@853#unicast.censurfridns.dk > <mailto:89.233.43.71@853#unicast.censurfridns.dk> > forward-addr: 158.64.1.29@853#kaitain.restena.lu > <mailto:158.64.1.29@853#kaitain.restena.lu> > forward-addr: 145.100.185.18@853#dnsovertls3.sinodun.com > <mailto:145.100.185.18@853#dnsovertls3.sinodun.com> > forward-addr: 145.100.185.17@853#dnsovertls2.sinodun.com > <mailto:145.100.185.17@853#dnsovertls2.sinodun.com> > forward-addr: 199.58.81.218@853#dns.cmrg.net > <mailto:199.58.81.218@853#dns.cmrg.net> > forward-addr: 94.130.110.185@853#ns1.dnsprivacy.at > <mailto:94.130.110.185@853#ns1.dnsprivacy.at> > forward-addr: 94.130.110.178@853#ns2.dnsprivacy.at > <mailto:94.130.110.178@853#ns2.dnsprivacy.at> > forward-addr: 99.192.182.200@853#iana.tenta.io > <mailto:99.192.182.200@853#iana.tenta.io> > forward-addr: 99.192.182.201@853#iana.tenta.io > <mailto:99.192.182.201@853#iana.tenta.io> > forward-addr: 99.192.182.100@853#opennic.tenta.io > <mailto:99.192.182.100@853#opennic.tenta.io> > forward-addr: 99.192.182.101@853#opennic.tenta.io > <mailto:99.192.182.101@853#opennic.tenta.io> > forward-tls-upstream: yes > > # OpenDNS is NOT DNSSEC enabled > server: auto-trust-anchor-file: "C:\Program Files\Unbound\root.key" > ### > > 21.07.2019 21:37, RayG via Unbound-users пишет: > > Hi, > > > > |I have configured things so far but I get these errors and I > think the reason is the “tls-cert-bundle” setting.| > > | | > > |16:10:16 C:\Program Files\Unbound\unbound.exe[1740:0] error: > ssl handshake failed crypto error:1416F086:SSL > routines:tls_process_server_certificate:certificate verify > failed| > > |21/07/2019| > > | | > > |So to get this working I have to enable this setting:| > > | | > > |tls-cert-bundle: /etc/ssl/certs/ca-certificates.crt| > > | | > > |That example would seem OK for a UNIX install but where/how do > I configure this for windows?| > > | | > > |Can I use the windows certificate store? If so what would the > entry read.| > > | | > > |Thanks| > > > > Regards > > Ray > > > > | | > > | | > > -- > > "C++ seems like a language suitable for firing other people's legs." > > > > ***************************** > > * C++20 : Bug to the future * > > ***************************** > > -- > > "C++ seems like a language suitable for firing other people's legs." > > > > ***************************** > > * C++20 : Bug to the future * > > ***************************** >
