up until now, message->tsigkey could only be set during parsing
of the request, but gss-tsig allows one to be created afterward.
this commit adds a new flag to the message structure, `new_tsigkey`,
which indicates that in this case it's okay for `dns_message_settsigkey()`
to be run on a message after parsing, without hitting any assertions due
to the lack of a TSIG in the request. this allows us to keep the current
restriction in place generally, but add an exception for TKEY processing.
it's probably better to just remove the restriction entirely (see next
commit).
If we try to fetch a record from cache and need to look into
hints database we assume that the resolver is not primed and
start dns_resolver_prime(). Priming query is supposed to return
NSes for "." in ANSWER section and glue records for them in
ADDITIONAL section, so that we can fill that info in 'regular'
cache and not use hints db anymore.
However, if we're using a forwarder the priming query goes through
it, and if it's configured to return minimal answers we won't get
the addresses of root servers in ADDITIONAL section. Since the
only records for root servers we have are in hints database we'll
try to prime the resolver with every single query.
This patch adds a DNS_FETCHOPT_NOFORWARD flag which avoids using
forwarders if possible (that is if we have forward-first policy).
Using this flag on priming fetch fixes the problem as we get the
proper glue. With forward-only policy the problem is non-existent,
as we'll never ask for root server addresses because we'll never
have a need to query them.
Also added a test to confirm priming queries are not forwarded.
dnssec-signzone should sign a zonefile that contains a DNSKEY record
with an unsupported algorithm. Current behavior is that it will
fail, hitting a fatal error. The fix detects unsupported algorithms
and will not try to add it to the keylist.
Also when determining the maximum iterations for NSEC3, don't take
into account DNSKEY records in the zonefile with an unsupported
algorithm.
- "hook" is now used only for hook points and hook actions
- the "hook" statement in named.conf is now "plugin"
- ns_module and ns_modlist are now ns_plugin and ns_plugins
- ns_module_load is renamed ns_plugin_register
- the mandatory functions in plugin modules (hook_register,
hook_check, hook_version, hook_destroy) have been renamed
- use a per-view module list instead of global hook_modules
- create an 'instance' pointer when registering modules, store it in
the module structure, and use it as action_data when calling
hook functions - this enables multiple module instances to be set
up in parallel
- also some nomenclature changes and cleanup
- added a 'hookdata' array to qctx to store pointers to up to
16 blobs of data which are allocated by modules as needed.
each module is assigned an ID number as it's loaded, and this
is the index into the hook data array. this is to be used for
holding persistent state between calls to a hook module for a
specific query.
- instead of using qctx->filter_aaaa, we now use qctx->hookdata.
(this was the last piece of filter-aaaa specific code outside the
module.)
- added hook points for qctx initialization and destruction. we get
a filter-aaaa data pointer from the mempool when initializing and
store it in the qctx->hookdata table; return to to the mempool
when destroying the qctx.
- link the view to the qctx so that detaching the client doesn't cause
hooks to fail
- added a qctx_destroy() function which must be called after qctx_init;
this calls the QCTX_DESTROY hook and detaches the view
- general cleanup and comments
- make some cfg-parsing functions global so they can be run
from filter-aaaa.so
- add filter-aaaa options to the hook module's parser
- mark filter-aaaa options in named.conf as obsolete, remove
from named and checkconf, and update the filter-aaaa test not to
use checkconf anymore
- remove filter-aaaa-related struct members from dns_view
- allow multiple "hook" statements at global or view level
- add "optional bracketed text" type for optional parameter list
- load hook module from specified path rather than hardcoded path
- add a hooktable pointer (and a callback for freeing it) to the
view structure
- change the hooktable functions so they no longer update ns__hook_table
by default, and modify PROCESS_HOOK so it uses the view hooktable, if
set, rather than ns__hook_table. (ns__hook_table is retained for
use by unit tests.)
- update the filter-aaaa system test to load filter-aaaa.so
- add a prereq script to check for dlopen support before running
the filter-aaaa system test
not yet done:
- configuration parameters are not being passed to the filter-aaaa
module; the filter-aaaa ACL and filter-aaaa-on-{v4,v6} settings are
still stored in dns_view
- the goal of this change is for AAAA filtering to be fully contained
in the query logic, and implemented at discrete points that can be
replaced with hook callouts later on.
- the new code may be slightly less efficient than the old filter-aaaa
implementation, but maximum efficiency was never a priority for AAAA
filtering anyway.
- we now use the rdataset RENDERED attribute to indicate that an AAAA
rdataset should not be included when rendering the message. (this
flag was originally meant to indicate that an rdataset has already
been rendered and should not be repeated, but it can also be used to
prevent rendering in the first place.)
- the DNS_MESSAGERENDER_FILTER_AAAA, NS_CLIENTATTR_FILTER_AAAA,
and DNS_RDATASETGLUE_FILTERAAAA flags are all now unnecessary and
have been removed.
- move hooks.h to public include directory
- ns_hooktable_init() initializes a hook table. if NULL is passed in, it
initializes the global hook table
- ns_hooktable_save() saves a pointer to the current global hook table.
- ns_hooktable_reset() replaces the global hook table with different
one
- ns_hook_add() adds hooks at specified hook points in a hook table (or
the global hook table if the specified table is NULL)
- load and unload functions support dlopen() of hook modules (this is
adapted from dyndb and not yet functional)
- began adding new hook points to query.c
Sometimes it is useful to set a 'floor' on the TTL for records
to be cached. Some sites like to use ridiculously low TTLs for
some reason, and that often is not compatible with slow links.
Signed-off-by: Michael Milligan <milli@acmeps.com>
Signed-off-by: LaMont Jones <lamont@debian.org>
Tell the user explicitly about their mistakes:
* Unknown options, e.g. -list instead of -dump
or -delete instead of -remove.
* Unknown view names.
* Excess arguments.
Include the view name in `rndc nta -dump` output, for consistency with
the NTA add and remove actions.
When removing an NTA from all views, do not abort with an error if the
NTA was not found in one of the views.
Use a zone's 'type' field instead of the value of its DNS_ZONEOPT_MIRROR
option for checking whether it is a mirror zone. This makes said zone
option and its associated helper function, dns_zone_mirror(), redundant,
so remove them. Remove a check specific to mirror zones from
named_zone_reusable() since another check in that function ensures that
changing a zone's type prevents it from being reused during
reconfiguration.
Rather than overloading dns_zone_slave and discerning between a slave
zone and a mirror zone using a zone option, define a separate enum
value, dns_zone_mirror, to be used exclusively by mirror zones. Update
code handling slave zones to ensure it also handles mirror zones where
applicable.
- added new 'validate-except' option, which configures an NTA with
expiry of 0xffffffff. NTAs with that value in the expiry field do not
expire, are are not written out when saving the NTA table and are not
dumped by rndc secroots
Since idn_output_filter() no longer uses its 'absolute' argument and no
other callback is used with dns_name_settotextfilter(), remove the
'absolute' argument from the dns_name_totextfilter_t prototype.
Since BIND libraries are no longer considered public and
dns_rdataslab_tordataset() is not used anywhere in the tree, remove the
latter and its associated dns_rdatasetmethods_t callbacks from
lib/dns/rdataslab.c.
If transferring or loading a mirror zone fails, resolution should still
succeed by means of falling back to regular recursive queries.
Currently, though, if a slave zone is present in the zone table and not
loaded, a SERVFAIL response is generated. Thus, mirror zones need
special handling in this regard.
Add a new dns_zt_find() flag, DNS_ZTFIND_MIRROR, and set it every time a
domain name is looked up rather than a zone itself. Handle that flag in
dns_zt_find() in such a way that a mirror zone which is expired or not
yet loaded is ignored when looking up domain names, but still possible
to find when the caller wants to know whether the zone is configured.
This causes a fallback to recursion when mirror zone data is unavailable
without making unloaded mirror zones invisible to code checking a zone's
existence.
Zone RRsets are assigned trust level "ultimate" upon load, which causes
the AD bit to not be set in responses coming from slave zones, including
mirror zones. Make dns_zoneverify_dnssec() update the trust level of
verified RRsets to "secure" so that the AD bit is set in such responses.
No rollback mechanism is implemented as dns_zoneverify_dnssec() fails in
case of any DNSSEC failure, which causes the mirror zone version being
verified to be discarded.
Add a function for determining whether the supplied version of a mirror
zone passes DNSSEC validation and is signed using a trusted key. Define
a new libdns result signifying a zone verification failure.
Extend check_dnskey_sigs() so that, if requested, it checks whether the
DNSKEY RRset at zone apex is signed by at least one trust anchor. The
trust anchor table is passed as an argument to dns_zoneverify_dnssec()
and passed around in the verification context structure. Neither
dnssec-signzone nor dnssec-verify are yet modified to make use of that
feature, though.
Add a new slave-only boolean configuration option, "mirror", along with
its corresponding dns_zoneopt_t enum and a helper function for checking
whether that option was set for a given zone. This commit does not
introduce any behavior changes yet.
Since exit() is no longer called upon any dns_zoneverify_dnssec() error,
verification failures should be signalled to callers. Make
dns_zoneverify_dnssec() return an isc_result_t and handle both success
and error appropriately in bin/dnssec/dnssec-signzone.c and
bin/dnssec/dnssec-verify.c. This enables memory leak detection during
shutdown of these tools and causes dnssec-signzone to print signing
statistics even when zone verification fails.
These functions will be used in the process of replacing fatal(),
check_result(), and fprintf() calls throughout lib/dns/zoneverify.c with
code that does not call exit(). They are intended for:
- zoneverify_log_error(): logging problems encountered while
performing zone verification,
- zoneverify_print(): printing status messages and reports which are
only useful in standalone tools.
To make using dns_zone_logv() possible, add a new "zone" argument to
dns_zoneverify_dnssec() that standalone tools are expected to set to
NULL.
This commit only moves code around, with the following exceptions:
- the check_dns_dbiterator_current() macro and functions
is_delegation() and has_dname() were removed from
bin/dnssec/dnssectool.{c,h} and duplicated in two locations:
bin/dnssec/dnssec-signzone.c and lib/dns/zoneverify.c; these
functions are used both by the code in bin/dnssec/dnssec-signzone.c
and verifyzone(), but are not a good fit for being exported by a
code module responsible for zone verification,
- fatal() and check_result() were duplicated in lib/dns/zoneverify.c
as static functions which do not use the "program" variable any more
(as it is only set by the tools in bin/dnssec/); this is a temporary
step which only aims to prevent compilation from breaking - these
duplicate functions will be removed once lib/dns/zoneverify.c is
refactored not to use them,
- the list of header files included by lib/dns/zoneverify.c was
expanded to encompass all header files that are actually used by the
code in that file,
- a description of the purpose of the commented out "fields" inside
struct nsec3_chain_fixed was added.
- make qname-minimization option tristate {strict,relaxed,disabled}
- go straight for the record if we hit NXDOMAIN in relaxed mode
- go straight for the record after 3 labels without new delegation or 7 labels total
- use start of fetch (and not time of response) as 'now' time for querying cache for
zonecut when following delegation.
Add a new libdns function, dns_zone_logv(), which takes a single va_list
argument rather than a variable number of arguments and can be used as a
base for implementing more specific zone logging functions.
- this was a compile time option to disable the use of a hash table in
the RBTDB. the code path without the hash table was buggy and
untested, and unlikely to be needed by anyone anyway.
- mark the 'geoip-use-ecs' option obsolete; warn when it is used
in named.conf
- prohibit 'ecs' ACL tags in named.conf; note that this is a fatal error
since simply ignoring the tags could make ACLs behave unpredictably
- re-simplify the radix and iptable code
- clean up dns_acl_match(), dns_aclelement_match(), dns_acl_allowed()
and dns_geoip_match() so they no longer take ecs options
- remove the ECS-specific unit and system test cases
- remove references to ECS from the ARM
The three functions has been modeled after the arc4random family of
functions, and they will always return random bytes.
The isc_random family of functions internally use these CSPRNG (if available):
1. getrandom() libc call (might be available on Linux and Solaris)
2. SYS_getrandom syscall (might be available on Linux, detected at runtime)
3. arc4random(), arc4random_buf() and arc4random_uniform() (available on BSDs and Mac OS X)
4. crypto library function:
4a. RAND_bytes in case OpenSSL
4b. pkcs_C_GenerateRandom() in case PKCS#11 library
Instead of relying on the caller to set up task-exclusive mode, make
dns_dt_reopen() enforce task-exclusive mode itself, using the task
specified at dnstap environment creation time.
Implement a new variant of dns_dt_create() to enable a dnstap
environment structure to hold the task in the context of which
dns_dt_reopen() will be executed.
