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path: root/src/resolve/resolved-dns-rr.c
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2016-02-13Merge pull request #2589 from keszybz/resolve-tool-2Lennart Poettering
Better support of OPENPGPKEY, CAA, TLSA packets and tests
2016-02-12resolve: always align flags to 8th column and print CAA flagsZbigniew Jędrzejewski-Szmek
Left-over unknown flags are printed numerically. Otherwise, it wouldn't be known what bits are remaining without knowning what the known bits are. A test case is added to verify the flag printing code: ============== src/resolve/test-data/fake-caa.pkts ============== google.com. IN CAA 0 issue "symantec.com" google.com. IN CAA 128 issue "symantec.com" -- Flags: critical google.com. IN CAA 129 issue "symantec.com" -- Flags: critical 1 google.com. IN CAA 22 issue "symantec.com" -- Flags: 22
2016-02-12resolve: parse CAA recordsZbigniew Jędrzejewski-Szmek
2016-02-12Fix hashing of TLSA packetsZbigniew Jędrzejewski-Szmek
Also add example files with TLSA and SSHFP records.
2016-02-12test-dns-packet: add framework to read and dump packetsZbigniew Jędrzejewski-Szmek
Packets are stored in a simple format: <size> <packet-wire-format> <size> <packet-wire-format> ... Packets for some example domains are dumped, to test rr code for various record types. Currently: A AAAA CAA DNSKEY LOC MX NS NSEC OPENPGPKEY SOA SPF TXT The hashing code is executed, but results are not checked. Also build other tests in src/resolve only with --enable-resolve.
2016-02-10tree-wide: remove Emacs lines from all filesDaniel Mack
This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.
2016-02-07treewide: fix typos and spacingTorstein Husebø
2016-01-29resolved: add macro to compare sized fieldsZbigniew Jędrzejewski-Szmek
For consistency, generic.size is renamed to generic.data_size. nsec3.next_hashed_name comparison was missing a size check.
2016-01-29resolved: calculate and print tags for DNSKEY recordsZbigniew Jędrzejewski-Szmek
2016-01-28resolved: expand flags field in DNSKEY recordsZbigniew Jędrzejewski-Szmek
2016-01-28resolved: convert TLSA fields to stringZbigniew Jędrzejewski-Szmek
Example output: _443._tcp.fedoraproject.org IN TLSA 0 0 1 GUAL5bejH7czkXcAeJ0vCiRxwMnVBsDlBMBsFtfLF8A= -- Cert. usage: CA constraint -- Selector: Full Certificate -- Matching type: SHA-256
2016-01-28resolved: OPENPGPKEY recordsZbigniew Jędrzejewski-Szmek
2016-01-28resolved: TLSA recordsZbigniew Jędrzejewski-Szmek
2016-01-28resolved: add alignment to base64Zbigniew Jędrzejewski-Szmek
We try to fit the lengthy key data into available space. If the other fields take less than half of the available columns, we use align everything in the remaining columns. Otherwise, we put everything after a newline, indented with 8 spaces. This is similar to dig and other tools do. $ COLUMNS=78 ./systemd-resolve -t any . . IN SOA a.root-servers.net nstld.verisign-grs.com 2016012701 1800 900 604800 86400 . IN RRSIG SOA RSASHA256 0 86400 20160206170000 20160127160000 54549 S1uhUoBAReAFi5wH/KczVDgwLb+B9Zp57dSYj9aX4XxBhKuzccIducpg0wWXhjCRAWuzY fQ/J2anm4+C4BLUTdlytPIemd42SUffQk2WGuuukI8e67nkrNF3WFtoeXQ4OchsyO24t2 rxi682Zo9ViqmXZ+MSsjWKt1jdem4noaY= . IN NS h.root-servers.net . IN NS k.root-servers.net . IN NS e.root-servers.net . IN NS c.root-servers.net . IN NS b.root-servers.net . IN NS g.root-servers.net . IN NS d.root-servers.net . IN NS f.root-servers.net . IN NS i.root-servers.net . IN NS j.root-servers.net . IN NS m.root-servers.net . IN NS a.root-servers.net . IN NS l.root-servers.net . IN RRSIG NS RSASHA256 0 518400 20160206170000 20160127160000 54549 rxhmTVKUgs72G3VzL+1JRuD0nGLIrPM+ISfmUx0eYUH5wZD5XMu2X+8PfkAsEQT1dziPs ac+zK1YZPbNgr3yGI5H/wEbK8S7DmlvO+/I9WKTLp/Zxn3yncvnTOdjFMZxkAqHbjVOm+ BFz7RjQuvCQlEJX4PQBFphgEnkiOnmMdI= . IN NSEC aaa ( NS SOA RRSIG NSEC DNSKEY ) . IN RRSIG NSEC RSASHA256 0 86400 20160206170000 20160127160000 54549 HY49/nGkUJJP1zLmH33MIKnkNH33jQ7bsAHE9itEjvC4wfAzgq8+Oh9fjYav1R1GDeJ2Z HOu3Z2uDRif10R8RsmZbxyZXJs7eHui9KcAMot1U4uKCCooC/5GImf+oUDbvaraUCMQRU D3mUzoa0BGWfxgZEDqZ55raVFT/olEgG8= . IN DNSKEY 257 3 RSASHA256 AwEAAagAIKlVZrpC6Ia7gEzahOR+9W29euxhJhVVLOyQbSEW0 O8gcCjFFVQUTf6v58fLjwBd0YI0EzrAcQqBGCzh/RStIoO8g0 NfnfL2MTJRkxoXbfDaUeVPQuYEhg37NZWAJQ9VnMVDxP/VHL4 96M/QZxkjf5/Efucp2gaDX6RS6CXpoY68LsvPVjR0ZSwzz1ap AzvN9dlzEheX7ICJBBtuA6G3LQpzW5hOA2hzCTMjJPJ8LbqF6 dsV6DoBQzgul0sGIcGOYl7OyQdXfZ57relSQageu+ipAdTTJ2 5AsRTAoub8ONGcLmqrAmRLKBP1dfwhYB4N7knNnulqQxA+Uk1 ihz0= . IN DNSKEY 256 3 RSASHA256 AwEAAbr/RV0stAWYbmKOldjShp4AOQGOyY3ATI1NUpP4X1qBs 6lsXpc+1ABgv6zkg02IktjZrHnmD0HsElu3wqXMrT5KL1W7Sp mg0Pou9WZ8QttdTKXwrVXrASsaGI2z/pLBSnK8EdzqUrTVxY4 TEGZtxV519isM06CCMihxTn5cfFBF . IN RRSIG DNSKEY RSASHA256 0 172800 20160204235959 20160121000000 19036 XYewrVdYKRDfZptAATwT+W4zng04riExV36+z04kok09W0RmOtDlQrlrwHLlD2iN/zYpg EqGgDF5T2xlrQdNpn+PFHhypHM7NQAgLTrwmiw6mGbV0bsZN3rhFxHwW7QVUFAvo9eNVu INrjm+sArwxq3DnPkmA+3K4ikKD2iiT/jT91VYr9SHFqXXURccLjI+nmaE7m31hXcirX/ r5i3J+B4Fx4415IavSD72r7cmruocnCVjcp+ZAUKeMyW+RwigzevLz3oEcCZ4nrTpGLEj wFaVePYoP+rfdmfLfTdmkkm4APRJa2My3XOdGFlgNS1pW1pH4az5LapLE2vMO7p1aQ== -- Information acquired via protocol DNS in 14.4ms. -- Data is authenticated: no
2016-01-17resolved: try to reduce number or DnsResourceKeys we keep around by merging themLennart Poettering
Quite often we read the same RR key multiple times from the same message. Try to replace them by a single object when we notice this. Do so again when we add things to the cache. This should reduce memory consumption a tiny bit.
2016-01-17resolved: complete NSEC non-existance proofsLennart Poettering
This fills in the last few gaps: - When checking if a domain is non-existing, also check that no wildcard for it exists - Ensure we don't base "covering" tests on NSEC RRs from a parent zone - Refuse to accept expanded wildcard NSEC RRs for absence proofs.
2016-01-17resolved: when validating an RRset, store information about the synthesizing ↵Lennart Poettering
source and zone in each RR Having this information available is useful when we need to check whether various RRs are suitable for proofs. This information is stored in the RRs as number of labels to skip from the beginning of the owner name to reach the synthesizing source/signer. Simple accessor calls are then added to retrieve the signer/source from the RR using this information. This also moves validation of a a number of RRSIG parameters into a new call dnssec_rrsig_prepare() that as side-effect initializes the two numeric values.
2016-01-11shared: make sure foo.bar and foobar result in different domain name hashesLennart Poettering
This also introduces a new macro siphash24_compress_byte() which is useful to add a single byte into the hash stream, and ports one user over to it.
2016-01-11resolved: when validating, first strip revoked trust anchor keys from ↵Lennart Poettering
validated keys list When validating a transaction we initially collect DNSKEY, DS, SOA RRs in the "validated_keys" list, that we need for the proofs. This includes DNSKEY and DS data from our trust anchor database. Quite possibly we learn that some of these DNSKEY/DS RRs have been revoked between the time we request and collect those additional RRs and we begin the validation step. In this case we need to make sure that the respective DS/DNSKEY RRs are removed again from our list. This patch adds that, and strips known revoked trust anchor RRs from the validated list before we begin the actual validation proof, and each time we add more DNSKEY material to it while we are doing the proof.
2016-01-03resolved: add negative trust anchro support, and add trust anchor ↵Lennart Poettering
configuration files This adds negative trust anchor support and allows reading trust anchor data from disk, from files /etc/systemd/dnssec-trust-anchors.d/*.positive and /etc/systemd/dnssec-trust-anchros.d/*.negative, as well as the matching counterparts in /usr/lib and /run. The positive trust anchor files are more or less compatible to normal DNS zone files containing DNSKEY and DS RRs. The negative trust anchor files contain only new-line separated hostnames for which to require no signing. By default no trust anchor files are installed, in which case the compiled-in root domain DS RR is used, as before. As soon as at least one positive root anchor for the root is defined via trust anchor files this buil-in DS RR is not added though.
2016-01-02resolved: only suffix RR key names with a dot if they don't have one yetLennart Poettering
2015-12-29resolved: add comments referencing various RFCs to various placesLennart Poettering
2015-12-29resolved: include GOST in list of DNSSEC algorithmsLennart Poettering
We don't implement it, and we have no intention to, but at least mention that it exists. (This also adds a couple of other algorithms to the algorithm string list, where these strings were missing previously.)
2015-12-28resolved: use RRSIG expiry and original TTL for cache managementLennart Poettering
When we verified a signature, fix up the RR's TTL to the original TTL mentioned in the signature, and store the signature expiry information in the RR, too. Then, use that when adding RRs to the cache.
2015-12-26resolved: internalize string buffer of dns_resource_record_to_string()Lennart Poettering
Let's simplify usage and memory management of DnsResourceRecord's dns_resource_record_to_string() call: cache the formatted string as part of the object, and return it on subsequent calls, freeing it when the DnsResourceRecord itself is freed.
2015-12-26resolved: when matching SOA RRs, don't eat up errorsLennart Poettering
2015-12-26resolved: when matching SOA RRs, honour RR classLennart Poettering
2015-12-18resolved: move DNS class utilities to dns-type.c and add more helpersLennart Poettering
Let's make DNS class helpers more like DNS type helpers, let's move them from resolved-dns-rr.[ch] into dns-type.[ch]. This also adds two new calls dns_class_is_pseudo() and dns_class_is_valid_rr() which operate similar to dns_type_is_pseudo() and dns_type_is_valid_rr() but for classes instead of types. This should hopefully make handling of DNS classes and DNS types more alike.
2015-12-18resolved: add support NSEC3 proofs, as well as proofs for domains that are ↵Lennart Poettering
OK to be unsigned This large patch adds a couple of mechanisms to ensure we get NSEC3 and proof-of-unsigned support into place. Specifically: - Each item in an DnsAnswer gets two bit flags now: DNS_ANSWER_AUTHENTICATED and DNS_ANSWER_CACHEABLE. The former is necessary since DNS responses might contain signed as well as unsigned RRsets in one, and we need to remember which ones are signed and which ones aren't. The latter is necessary, since not we need to keep track which RRsets may be cached and which ones may not be, even while manipulating DnsAnswer objects. - The .n_answer_cachable of DnsTransaction is dropped now (it used to store how many of the first DnsAnswer entries are cachable), and replaced by the DNS_ANSWER_CACHABLE flag instead. - NSEC3 proofs are implemented now (lacking support for the wildcard part, to be added in a later commit). - Support for the "AD" bit has been dropped. It's unsafe, and now that we have end-to-end authentication we don't need it anymore. - An auxiliary DnsTransaction of a DnsTransactions is now kept around as least as long as the latter stays around. We no longer remove the auxiliary DnsTransaction as soon as it completed. THis is necessary, as we now are interested not only in the RRsets it acquired but also in its authentication status.
2015-12-10resolved: cache - do negative caching only on the canonical nameTom Gundersen
Apart from dropping redundant information, this fixes an issue where, due to broken DNS servers, we can only be certain of whether an apparent NODATA response is in fact an NXDOMAIN response after explicitly resolving the canonical name. This issue is outlined in RFC2308. Moreover, by caching NXDOMAIN for an existing name, we would mistakenly return NXDOMAIN for types which should not be redirected. I.e., a query for AAAA on test-nx-1.jklm.no correctly returns NXDOMAIN, but a query for CNAME should return the record and a query for DNAME should return NODATA. Note that this means we will not cache an NXDOMAIN response in the presence of redirection, meaning one redundant roundtrip in case the name is queried again.
2015-12-10resolved: chase DNSKEY/DS RRs when doing look-ups with DNSSEC enabledLennart Poettering
This adds initial support for validating RRSIG/DNSKEY/DS chains when doing lookups. Proof-of-non-existance, or proof-of-unsigned-zones is not implemented yet. With this change DnsTransaction objects will generate additional DnsTransaction objects when looking for DNSKEY or DS RRs to validate an RRSIG on a response. DnsTransaction objects are thus created for three reasons now: 1) Because a user asked for something to be resolved, i.e. requested by a DnsQuery/DnsQueryCandidate object. 2) As result of LLMNR RR probing, requested by a DnsZoneItem. 3) Because another DnsTransaction requires the requested RRs for validation of its own response. DnsTransactions are shared between all these users, and are GC automatically as soon as all of these users don't need a specific transaction anymore. To unify the handling of these three reasons for existance for a DnsTransaction, a new common naming is introduced: each DnsTransaction now tracks its "owners" via a Set* object named "notify_xyz", containing all owners to notify on completion. A new DnsTransaction state is introduced called "VALIDATING" that is entered after a response has been receieved which needs to be validated, as long as we are still waiting for the DNSKEY/DS RRs from other DnsTransactions. This patch will request the DNSKEY/DS RRs bottom-up, and then validate them top-down. Caching of RRs is now only done after verification, so that the cache is not poisoned with known invalid data. The "DnsAnswer" object gained a substantial number of new calls, since we need to add/remove RRs to it dynamically now.
2015-12-10resolved: when outputting RRs in text form, append a trailing dot to owner namesLennart Poettering
After all, that's how this is done in DNS, and is particularly important if we look a DS/DNSKEY RRs for the root zone itself, where the owner name would otherwise be shown as completely empty (i.e. missing).
2015-12-10resolved: shortcut RR comparisons if pointers matchLennart Poettering
When iterating through RR lists we frequently end up comparing RRs and RR keys with themselves, hence att a minor optimization to check ptr values first, before doing a deep comparison.
2015-12-03resolved: rework how we allow allow queries to be dispatched to scopesLennart Poettering
Previously, we'd never do any single-label or root domain lookups via DNS, thus leaving single-label lookups to LLMNR and the search path logic in order that single-label names don't leak too easily onto the internet. With this change we open things up a bit, and only prohibit A/AAAA lookups of single-label/root domains, but allow all other lookups. This should provide similar protection, but allow us to resolve DNSKEY+DS RRs for the top-level and root domains. (This also simplifies handling of the search domain detection, and gets rid of dns_scope_has_search_domains() in favour of dns_scope_get_search_domains()).
2015-12-03resolved: optionally, allocate DnsResourceKey objects on the stackLennart Poettering
Sometimes when looking up entries in hashmaps indexed by a DnsResourceKey it is helpful not having to allocate a full DnsResourceKey dynamically just to use it as search key. Instead, optionally allow allocation of a DnsResourceKey on the stack. Resource keys allocated like that of course are subject to other lifetime cycles than the usual Resource keys, hence initialize the reference counter to to (unsigned) -1. While we are at it, remove the prototype for dns_resource_key_new_dname() which was never implemented.
2015-12-03resolved: move algorithm/digest definitions into resolved-dns-rr.hLennart Poettering
After all, they are for flags and parameters of RRs and already relevant when dealing with RRs outside of the serialization concept.
2015-12-02resolved: add code to generate the wire format for a single RRLennart Poettering
This adds dns_resource_record_to_wire_format() that generates the raw wire-format of a single DnsResourceRecord object, and caches it in the object, optionally in DNSSEC canonical form. This call is used later to generate the RR serialization of RRs to verify. This adds four new fields to DnsResourceRecord objects: - wire_format points to the buffer with the wire-format version of the RR - wire_format_size stores the size of that buffer - wire_format_rdata_offset specifies the index into the buffer where the RDATA of the RR begins (i.e. the size of the key part of the RR). - wire_format_canonical is a boolean that stores whether the cached wire format is in DNSSEC canonical form or not. Note that this patch adds a mode where a DnsPacket is allocated on the stack (instead of on the heap), so that it is cheaper to reuse the DnsPacket object for generating this wire format. After all we reuse the DnsPacket object for this, since it comes with all the dynamic memory management, and serialization calls we need anyway.
2015-12-02resolved: store DNSKEY fields flags+protocol as-isLennart Poettering
When verifying signatures we need to be able to verify the original data we got for an RR set, and that means we cannot simply drop flags bits or consider RRs invalid too eagerly. Hence, instead of parsing the DNSKEY flags store them as-is. Similar, accept the protocol field as it is, and don't consider it a parsing error if it is not 3. Of course, this means that the DNSKEY handling code later on needs to check explicit for protocol != 3.
2015-11-25dns-domain: simplify dns_name_is_root() and dns_name_is_single_label()Lennart Poettering
Let's change the return value to bool. If we encounter an error while parsing, return "false" instead of the actual parsing error, after all the specified hostname does not qualify for what the function is supposed to test. Dealing with the additional error codes was always cumbersome, and easily misused, like for example in the DHCP code. Let's also rename the functions from dns_name_root() to dns_name_is_root(), to indicate that this function checks something and returns a bool. Similar for dns_name_is_signal_label().
2015-11-25resolved: fully support DNS search domainsLennart Poettering
This adds support for searching single-label hostnames in a set of configured search domains. A new object DnsQueryCandidate is added that links queries to scopes. It keeps track of the search domain last used for a query on a specific link. Whenever a host name was unsuccessfuly resolved on a scope all its transactions are flushed out and replaced by a new set, with the next search domain appended. This also adds a new flag SD_RESOLVED_NO_SEARCH to disable search domain behaviour. The "systemd-resolve-host" tool is updated to make this configurable via --search=. Fixes #1697
2015-11-24resolved: implement client-side DNAME resolutionLennart Poettering
Most servers apparently always implicitly convert DNAME to CNAME, but some servers don't, hence implement this properly, as this is required by edns0.
2015-11-23resolved: accept TXT records with non-UTF8 stringsLennart Poettering
RFC 6763 is very clear that TXT RRs should allow arbitrary binary content, hence let's actually accept that. This also means accepting NUL bytes in the middle of strings.
2015-10-27util-lib: split out allocation calls into alloc-util.[ch]Lennart Poettering
2015-10-27util-lib: split out hex/dec/oct encoding/decoding into its own fileLennart Poettering
2015-10-24util-lib: split our string related calls from util.[ch] into its own file ↵Lennart Poettering
string-util.[ch] There are more than enough calls doing string manipulations to deserve its own files, hence do something about it. This patch also sorts the #include blocks of all files that needed to be updated, according to the sorting suggestions from CODING_STYLE. Since pretty much every file needs our string manipulation functions this effectively means that most files have sorted #include blocks now. Also touches a few unrelated include files.
2015-10-05hashmap: refactor hash_funcTom Gundersen
All our hash functions are based on siphash24(), factor out siphash_init() and siphash24_finalize() and pass the siphash state to the hash functions rather than the hash key. This simplifies the hash functions, and in particular makes composition simpler as calling siphash24_compress() repeatedly on separate chunks of input has the same effect as first concatenating the input and then calling siphash23_compress() on the result.
2015-09-16resolved: rr - introduce dns_resource_key_new_redirect()Tom Gundersen
Takes a key and CNAME RR and returns the canonical RR of the right type. Make use of this in dns_question_redirect().
2015-09-16resolved: rr - introduce dns_resource_key_new_cname()Tom Gundersen
Creates a new CNAME RR key with the same class and name as an existing key.
2015-08-21resolved: rework synthesizing logicLennart Poettering
With this change we'll now also generate synthesized RRs for the local LLMNR hostname (first label of system hostname), the local mDNS hostname (first label of system hostname suffixed with .local), the "gateway" hostname and all the reverse PTRs. This hence takes over part of what nss-myhostname already implemented. Local hostnames resolve to the set of local IP addresses. Since the addresses are possibly on different interfaces it is necessary to change the internal DnsAnswer object to track per-RR interface indexes, and to change the bus API to always return the interface per-address rather than per-reply. This change also patches the existing clients for resolved accordingly (nss-resolve + systemd-resolve-host). This also changes the routing logic for queries slightly: we now ensure that the local hostname is never resolved via LLMNR, thus making it trustable on the local system.
2015-07-24resolved: fix DNS_TYPE_ANY vs DNS_CLASS_ANY confusionDaniel Mack
Assigning a TPYE enum value to a class variable is certainly wrong. However, they both have the same value, so the result was correct nevertheless.