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diff --git a/doc/guix.texi b/doc/guix.texi index aa8b705be6..0d389261a2 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -218,6 +218,7 @@ Services * Messaging Services:: Messaging services. * Kerberos Services:: Kerberos services. * Web Services:: Web servers. +* DNS Services:: DNS daemons. * VPN Services:: VPN daemons. * Network File System:: NFS related services. * Continuous Integration:: The Cuirass service. @@ -8737,6 +8738,7 @@ declaration. * Messaging Services:: Messaging services. * Kerberos Services:: Kerberos services. * Web Services:: Web servers. +* DNS Services:: DNS daemons. * VPN Services:: VPN daemons. * Network File System:: NFS related services. * Continuous Integration:: The Cuirass service. @@ -13520,6 +13522,414 @@ Whether the server should add its configuration to response. @end table @end deftp +@node DNS Services +@subsubsection DNS Services +@cindex DNS (domain name system) +@cindex domain name system (DNS) + +The @code{(gnu services dns)} module provides services related to the +@dfn{domain name system} (DNS). It provides a server service for hosting +an @emph{authoritative} DNS server for multiple zones, slave or master. +This service uses @uref{https://www.knot-dns.cz/, Knot DNS}. + +An example configuration of an authoritative server for two zones, one master +and one slave, is: + +@lisp +(define-zone-entries example.org.zone +;; Name TTL Class Type Data + ("@@" "" "IN" "A" "127.0.0.1") + ("@@" "" "IN" "NS" "ns") + ("ns" "" "IN" "A" "127.0.0.1")) + +(define master-zone + (knot-zone-configuration + (domain "example.org") + (zone (zone-file + (origin "example.org") + (entries example.org.zone))))) + +(define slave-zone + (knot-zone-configuration + (domain "plop.org") + (dnssec-policy "default") + (master (list "plop-master")))) + +(define plop-master + (knot-remote-configuration + (id "plop-master") + (address (list "208.76.58.171")))) + +(operating-system + ;; ... + (services (cons* (service knot-service-type + (knot-confifguration + (remotes (list plop-master)) + (zones (list master-zone slave-zone)))) + ;; ... + %base-services))) +@end lisp + +@deffn {Scheme Variable} knot-service-type +This is the type for the Knot DNS server. + +Knot DNS is an authoritative DNS server, meaning that it can serve multiple +zones, that is to say domain names you would buy from a registrar. This server +is not a resolver, meaning that it can only resolve names for which it is +authoritative. This server can be configured to serve zones as a master server +or a slave server as a per-zone basis. Slave zones will get their data from +masters, and will serve it as an authoritative server. From the point of view +of a resolver, there is no difference between master and slave. + +The following data types are used to configure the Knot DNS server: +@end deffn + +@deftp {Data Type} knot-key-configuration +Data type representing a key. +This type has the following parameters: + +@table @asis +@item @code{id} (default: @code{""}) +An identifier for other configuration fields to refer to this key. IDs must +be unique and must not be empty. + +@item @code{algorithm} (default: @code{#f}) +The algorithm to use. Choose between @code{#f}, @code{'hmac-md5}, +@code{'hmac-sha1}, @code{'hmac-sha224}, @code{'hmac-sha256}, @code{'hmac-sha384} +and @code{'hmac-sha512}. + +@item @code{secret} (default: @code{""}) +The secret key itself. + +@end table +@end deftp + +@deftp {Data Type} knot-acl-configuration +Data type representing an Access Control List (ACL) configuration. +This type has the following parameters: + +@table @asis +@item @code{id} (default: @code{""}) +An identifier for ether configuration fields to refer to this key. IDs must be +unique and must not be empty. + +@item @code{address} (default: @code{'()}) +An ordered list of IP addresses, network subnets, or network ranges represented +with strings. The query must match one of them. Empty value means that +address match is not required. + +@item @code{key} (default: @code{'()}) +An ordered list of references to keys represented with strings. The string +must match a key ID defined in a @code{knot-key-configuration}. No key means +that a key is not require to match that ACL. + +@item @code{action} (default: @code{'()}) +An ordered list of actions that are permitted or forbidden by this ACL. Possible +values are lists of zero or more elements from @code{'transfer}, @code{'notify} +and @code{'update}. + +@item @code{deny?} (default: @code{#f}) +When true, the ACL defines restrictions. Listed actions are forbidden. When +false, listed actions are allowed. + +@end table +@end deftp + +@deftp {Data Type} zone-entry +Data type represnting a record entry in a zone file. +This type has the following parameters: + +@table @asis +@item @code{name} (default: @code{"@@"}) +The name of the record. @code{"@@"} refers to the origin of the zone. Names +are relative to the origin of the zone. For example, in the @code{example.org} +zone, @code{"ns.example.org"} actually refers to @code{ns.example.org.example.org}. +Names ending with a dot are absolute, which means that @code{"ns.example.org."} +refers to @code{ns.example.org}. + +@item @code{ttl} (default: @code{""}) +The Time-To-Live (TTL) of this record. If not set, the default TTL is used. + +@item @code{class} (default: @code{"IN"}) +The class of the record. Knot currently supports only @code{"IN"} and +partially @code{"CH"}. + +@item @code{type} (default: @code{"A"}) +The type of the record. Common types include A (IPv4 address), AAAA (IPv6 +address), NS (Name Server) and MX (Mail eXchange). Many other types are +defined. + +@item @code{data} (default: @code{""}) +The data contained in the record. For instance an IP address associated with +an A record, or a domain name associated with an NS record. Remember that +domain names are relative to the origin unless they end with a dot. + +@end table +@end deftp + +@deftp {Data Type} zone-file +Data type representing the content of a zone file. +This type has the following parameters: + +@table @asis +@item @code{entries} (default: @code{'()}) +The list of entries. The SOA record is taken care of, so you don't need to +put it in the list of entries. This list should probably contain an entry +for your primary authoritative DNS server. Other than using a list of entries +directly, you can use @code{define-zone-entries} to define a object containing +the list of entries more easily, that you can later pass to the @code{entries} +field of the @code{zone-file}. + +@item @code{origin} (default: @code{""}) +The name of your zone. This parameter cannot be empty. + +@item @code{ns} (default: @code{"ns"}) +The domain of your primary authoritative DNS server. The name is relative to +the origin, unless it ends with a dot. It is mandatory that this primary +DNS server corresponds to an NS record in the zone and that it is associated +to an IP address in the list of entries. + +@item @code{mail} (default: @code{"hostmaster"}) +An email address people can contact you at, as the owner of the zone. This +is translated as @code{<mail>@@<origin>}. + +@item @code{serial} (default: @code{1}) +The serial number of the zone. As this is used to keep track of changes by +both slaves and resolvers, it is mandatory that it @emph{never} decreases. +Always increment it when you make a change in your zone. + +@item @code{refresh} (default: @code{"2d"}) +The frequency at which slaves will do a zone transfer. This value can be +a number of seconds or a number of some unit between: +@itemize +@item m: minute +@item h: hour +@item d: day +@item w: week +@end itemize + +@item @code{retry} (default: @code{"15m"}) +The period after which a slave will retry to contact its master when it fails +to do so a first time. + +@item @code{expiry} (default: @code{"2w"}) +Default TTL of records. Existing records are considered correct for at most +this amount of time. After this period, resolvers will invalidate their cache +and check again that it still exists. + +@item @code{nx} (default: @code{"1h"}) +Default TTL of inexistant records. This delay is usually short because you want +your new domains to reach everyone quickly. + +@end table +@end deftp + +@deftp {Data Type} knot-remote-configuration +Data type representing a remote configuration. +This type has the following parameters: + +@table @asis +@item @code{id} (default: @code{""}) +An identifier for other configuration fields to refer to this remote. IDs must +be unique and must not be empty. + +@item @code{address} (default: @code{'()}) +An ordered list of destination IP addresses. Addresses are tried in sequence. +An optional port can be given with the @@ separator. For instance: +@code{(list "1.2.3.4" "2.3.4.5@@53")}. Default port is 53. + +@item @code{via} (default: @code{'()}) +An ordered list of source IP addresses. An empty list will have Knot choose +an appropriate source IP. An optional port can be given with the @@ separator. +The default is to choose at random. + +@item @code{key} (default: @code{#f}) +A reference to a key, that is a string containing the identifier of a key +defined in a @code{knot-key-configuration} field. + +@end table +@end deftp + +@deftp {Data Type} knot-keystore-configuration +Data type representing a keystore to hold dnssec keys. +This type has the following parameters: + +@table @asis +@item @code{id} (default: @code{""}) +The id of the keystore. It must not be empty. + +@item @code{backend} (default: @code{'pem}) +The backend to store the keys in. Can be @code{'pem} or @code{'pkcs11}. + +@item @code{config} (default: @code{"/var/lib/knot/keys/keys"}) +The configuration string of the backend. An example for the PKCS#11 is: +@code{"pkcs11:token=knot;pin-value=1234 /gnu/store/.../lib/pkcs11/libsofthsm2.so"}. +For the pem backend, the string reprensents a path in the filesystem. + +@end table +@end deftp + +@deftp {Data Type} knot-policy-configuration +Data type representing a dnssec policy. Knot DNS is able to automatically +sign your zones. It can either generate and manage your keys automatically or +use keys that you generate. + +Dnssec is usually implemented using two keys: a Key Signing Key (KSK) that is +used to sign the second, and a Zone Signing Key (ZSK) that is used to sign the +zone. In order to be trusted, the KSK needs to be present in the parent zone +(usually a top-level domain). If your registrar supports dnssec, you will +have to send them your KSK's hash so they can add a DS record in their zone. +This is not automated and need to be done each time you change your KSK. + +The policy also defines the lifetime of keys. Usually, ZSK can be changed +easily and use weaker cryptographic functions (they use lower parameters) in +order to sign records quickly, so they are changed often. The KSK however +requires manual interaction with the registrar, so they are changed less often +and use stronger parameters because they sign only one record. + +This type has the following parameters: + +@table @asis +@item @code{id} (default: @code{""}) +The id of the policy. It must not be empty. + +@item @code{keystore} (default: @code{"default"}) +A reference to a keystore, that is a string containing the identifier of a +keystore defined in a @code{knot-keystore-configuration} field. The +@code{"default"} identifier means the default keystore (a kasp database that +was setup by this service). + +@item @code{manual?} (default: @code{#f}) +Whether the key management is manual or automatic. + +@item @code{single-type-signing?} (default: @code{#f}) +When @code{#t}, use the Single-Type Signing Scheme. + +@item @code{algorithm} (default: @code{"ecdsap256sha256"}) +An algorithm of signing keys and issued signatures. + +@item @code{ksk-size} (default: @code{256}) +The length of the KSK. Note that this value is correct for the default +algorithm, but would be unsecure for other algorithms. + +@item @code{zsk-size} (default: @code{256}) +The length of the ZSK. Note that this value is correct for the default +algorithm, but would be unsecure for other algorithms. + +@item @code{dnskey-ttl} (default: @code{'default}) +The TTL value for DNSKEY records added into zone apex. The special +@code{'default} value means same as the zone SOA TTL. + +@item @code{zsk-lifetime} (default: @code{"30d"}) +The period between ZSK publication and the next rollover initiation. + +@item @code{propagation-delay} (default: @code{"1d"}) +An extra delay added for each key rollover step. This value should be high +enough to cover propagation of data from the master server to all slaves. + +@item @code{rrsig-lifetime} (default: @code{"14d"}) +A validity period of newly issued signatures. + +@item @code{rrsig-refresh} (default: @code{"7d"}) +A period how long before a signature expiration the signature will be refreshed. + +@item @code{nsec3?} (default: @code{#f}) +When @code{#t}, NSEC3 will be used instead of NSEC. + +@item @code{nsec3-iterations} (default: @code{5}) +The number of additional times the hashing is performed. + +@item @code{nsec3-salt-length} (default: @code{8}) +The length of a salt field in octets, which is appended to the original owner +name before hashing. + +@item @code{nsec3-salt-lifetime} (default: @code{"30d"}) +The validity period of newly issued salt field. + +@end table +@end deftp + +@deftp {Data Type} knot-zone-configuration +Data type representing a zone served by Knot. +This type has the following parameters: + +@table @asis +@item @code{domain} (default: @code{""}) +The domain served by this configuration. It must not be empty. + +@item @code{file} (default: @code{""}) +The file where this zone is saved. This parameter is ignored by master zones. +Empty means default location that depends on the domain name. + +@item @code{zone} (default: @code{(zone-file)}) +The content of the zone file. This parameter is ignored by slave zones. It +must contain a zone-file record. + +@item @code{master} (default: @code{'()}) +A list of master remotes. When empty, this zone is a master. When set, this +zone is a slave. This is a list of remotes identifiers. + +@item @code{ddns-master} (default: @code{#f}) +The main master. When empty, it defaults to the first master in the list of +masters. + +@item @code{notify} (default: @code{'()}) +A list of slave remote identifiers. + +@item @code{acl} (default: @code{'()}) +A list of acl identifiers. + +@item @code{semantic-checks?} (default: @code{#f}) +When set, this adds more semantic checks to the zone. + +@item @code{disable-any?} (default: @code{#f}) +When set, this forbids queries of the ANY type. + +@item @code{zonefile-sync} (default: @code{0}) +The delay between a modification in memory and on disk. 0 means immediate +synchronization. + +@item @code{serial-policy} (default: @code{'increment}) +A policy between @code{'increment} and @code{'unixtime}. + +@end table +@end deftp + +@deftp {Data Type} knot-configuration +Data type representing the Knot configuration. +This type has the following parameters: + +@table @asis +@item @code{knot} (default: @code{knot}) +The Knot package. + +@item @code{run-directory} (default: @code{"/var/run/knot"}) +The run directory. This directory will be used for pid file and sockets. + +@item @code{listen-v4} (default: @code{"0.0.0.0"}) +An ip address on which to listen. + +@item @code{listen-v6} (default: @code{"::"}) +An ip address on which to listen. + +@item @code{listen-port} (default: @code{53}) +A port on which to listen. + +@item @code{keys} (default: @code{'()}) +The list of knot-key-configuration used by this configuration. + +@item @code{acls} (default: @code{'()}) +The list of knot-acl-configuration used by this configuration. + +@item @code{remotes} (default: @code{'()}) +The list of knot-remote-configuration used by this configuration. + +@item @code{zones} (default: @code{'()}) +The list of knot-zone-configuration used by this configuration. + +@end table +@end deftp + @node VPN Services @subsubsection VPN Services @cindex VPN (virtual private network) |