Downgrade CAP_NET_ADMIN to CAP_NET_RAW in unbound.service
Since kernel 3.2, CAP_NET_RAW instead of CAP_NET_ADMIN is sufficient to allow for the usage of the IP_TRANSPARENT socket option. CAP_NET_ADMIN allows far more mayhem then CAP_NET_RAW, so prefer the safer, more restrictive solution.
Make it more consistent throughout the man page.
If a config option can either be *yes* or *no* use exact these terms and not something like *on* which could be easily read as *no*.
Improvements and fixes for systemd unbound.service
1. Remove `ProtectKernelTunables=true`: This prevents various with socket options from working as shown below.
`unbound[] warning: so-rcvbuf 1048576 was not granted. Got 425984. To fix: start with root permissions(linux) or sysctl bigger net.core.rmem_max(linux) or kern.ipc.maxsockbuf(bsd) values.`
2. Add `CAP_NET_ADMIN` to available caps which is needed for `ip-transparent: yes` config option to work as shown below.
`unbound[] warning: setsockopt(.. IP_TRANSPARENT ..) failed: Operation not permitted`
3. Make `ReadWritePaths` less permissive: `UNBOUND_SYSCONF_DIR` equals to `sysconfdir` which usually equals to `/etc` and `UNBOUND_LOCALSTATE_DIR` equals to `localstatedir` which usually equals to `/var`. Allowing write access for those dirs shouldn't be needed. The only dirs unbound should be allow to write to are `/run` ( for pidfile), `@UNBOUND_RUN_DIR@` (for chroot) and `@UNBOUND_CHROOT_DIR@` in case it differs from the previous one.
4. Bind-mount `/run/systemd/notify`, `UNBOUND_PIDFILE`, `/dev/log`, `/dev/urandom` in order to use them inside chroot.
5. Add few extra hardening options: `RestrictNamespaces`, `LockPersonality` and `RestrictSUIDSGID` should be safe to use.
- Fix #72: configure --with-syslog-facility=LOCAL0-7 with default
LOG_DAEMON (as before) can set the syslog facility that the server
uses to log messages.
- squelch DNS over TLS errors 'ssl handshake failed crypto error'
on low verbosity, they show on verbosity 3 (query details), because
there is a high volume and the operator cannot do anything for the
remote failure. Specifically filters the high volume errors.
- Fix unittest valgrind false positive uninitialised value report,
where if gcc 9.1.1 uses -O2 (but not -O1) then valgrind 3.15.0
issues an uninitialised value for the token buffer at the str2wire.c
rrinternal_get_owner() strcmp with the '@' value. Rewritten to use
straight character comparisons removes the false positive. Also
valgrinds --expensive-definedness-checks=yes can stop this false
positive.
- Introduce `-V` option to print the version number and build options.
Previously reported build options like linked libs and linked modules
are now moved from `-h` to `-V` as well for consistency.
- PACKAGE_BUGREPORT now also includes link to GitHub issues.
- Fix #48: Unbound returns additional records on NODATA response,
if minimal-responses is enabled, also the additional for negative
responses is removed.
Ralph Dolmans [Tue, 9 Jul 2019 12:58:36 +0000 (14:58 +0200)]
- Fix in respip addrtree selection. Absence of addr_tree_init_parents() call
made it impossible to go up the tree when the matching netmask is too
specific.
- For #45, check that 127.0.0.1 and ::1 are not used in unbound.conf
when do-not-query-localhost is turned on, or at default on,
unbound-checkconf prints a warning if it is found in forward-addr or
stub-addr statements.
- Fix to make unbound-control with ipset, remove unused variable,
use unsigned type because of comparison, and assign null instead
of compare with it. Remade lex and yacc output.
- PR #28: IPSet module, by Kevin Chou. Created a module to support
the ipset that could add the domain's ip to a list easily.
Needs libmnl, and --enable-ipset and config it, doc/README.ipset.md.
- Fix to omit RRSIGs from addition to the ipset.
- Fix that fixes the Fix that spoolbuf is not used to store tcp
pipelined response between mesh send and callback end, this fixes
error cases that did not use the correct spoolbuf.
- Squelch log messages from tcp send about connection reset by peer.
They can be enabled with verbosity at higher values for diagnosing
network connectivity issues.
- Revert fix for oss-fuzz, error is in that build script that
unconditionally includes .o files detected by configure, also
when the machine architecture uses different LIBOBJS files.
This sets the hash function to use a slower but better auditable code
that does not read beyond array boundaries. This makes code better
security checkable, and is better for security. It is fixed to be
slower, but not read outside of the array.
projects / thirdparty / unbound.git / log
