8
Bind 9.18.18 dnssec key location and privileges? (lemmy.world)
submitted 10 months ago* (last edited 10 months ago) by tburkhol@lemmy.world to c/selfhosted@lemmy.world
3 comments fedilink hide all child comments

[update, solved] It was apparmor, which was lying about being inactive. Ubuntu's default profile denies bind write access to its config directory. Needed to add /etc/bind/dnskeys/** rw, reload apparmor, and it's all good.

Trying to switch my internal domain from auto-dnssec maintain to dnssec-policy default. Zone is signed but not secure and logs are full of

zone_rekey:dns_dnssec_keymgr failed: error occurred writing key to disk

key-directory is /etc/bind/dnskeys, owned bind:bind, and named runs as bind

I've set every directory I could think of to 777: /etc/bind, /etc/bind/dnskeys, /var/lib/bind, /var/cache/bind, /var/log/bind. I disabled apparmor, in case it was blocking.

A signed zone file appears, but I can't dig any DNSKEYs or RRSIGs. named-checkzone says there's nsec records in the signed file, so something is happening, but I'm guessing it all stops when keymgr fails to write the key.

I tried manually generating a key and sticking it in dnskeys, but this doesn't appear to be used.

all 4 comments
sorted by: hot top controversial new old
[-] TheInsane42@lemmy.world 1 points 10 months ago* (last edited 10 months ago)

You need to include the files in the zone file. Bind 9.18.18 is a mess with the changed DNSSEC setup, it broke my domains as well. I't isn the bind documentation, so I have to refer you there. I have no access to my setup now (or my browser history) as I'm not at my computer.

Edit: managed to get in dns.

named.conf.local: zonefile needa to be the .signed file the unsigned zone file must have both keys included, best is via absolute path:

$INCLUDE "/etc/bind/keys/example.com.123456.key"

for both the ZSK and KSK keys. The include is to get the RRSIG entries.

[-] tburkhol@lemmy.world 1 points 10 months ago

I'd tried that...this has been going on for five days, and I can not describe my level of frustration. But I solved it, literally just now.

Despite systemctl status apparmor.service claiming it was inactive, it was secretly active. audit.log was so full of sudo that I failed to see all of the

apparmor="DENIED" operation="mknod" profile="/usr/sbin/named" name="/etc/bind/dnssec-keys/K[zone].+013+16035.l6WOJd" pid=152161 comm="isc-net-0002" requested_mask="c" denied_mask="c" fsuid=124 ouid=124FSUID="bind" OUID="bind"

That made me realize, when I thought I fixed the apparmor rule, I'd used /etc/bind/dnskey/ rw instead of /etc/bind/dnskey/** rw

The bind manual claims that you don't need to manually create keys or manually include them in your zone file, if you use dnssec-policy default or presumably any other policy with inline-signing. Claims that bind will generate its own keys, write them, and even manage timed rotation or migration to a new policy. I can't confirm or deny that, because it definitely found the keys I had manually created (one of which was $INCLUDEd in the zone file, and one not) and used them. It also edited them and created .state files.

I feel like I should take the rest of the day off and celebrate.

[-] TheInsane42@lemmy.world 1 points 10 months ago

Sorry, totally forgot apparmor. On debian that thing can be nasty, I had to fix those rules as well for bind That was years ago and was added to my Puppet module, so I forgot.

this post was submitted on 31 Jan 2024
8 points (90.0% liked)

Selfhosted

40697 readers
124 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

  1. Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.

  2. No spam posting.

  3. Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.

  4. Don't duplicate the full text of your blog or github here. Just post the link for folks to click.

  5. Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).

  6. No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 2 years ago
MODERATORS
ruud@lemmy.world
Loki@lemmy.world
CannaVet@lemmy.world
devve@lemmy.world
HybridSarcasm@lemmy.world
HybridSarcasm@lemmy.hybridsarcasm.xyz