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Neither the name of the Institute nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $Id$ .\" .Dd May 4, 2005 .Dt KRB5.CONF 5 .Os HEIMDAL .Sh NAME .Nm krb5.conf .Nd configuration file for Kerberos 5 .Sh SYNOPSIS .In krb5.h .Sh DESCRIPTION The .Nm file specifies several configuration parameters for the Kerberos 5 library, as well as for some programs. .Pp The file consists of one or more sections, containing a number of bindings. The value of each binding can be either a string or a list of other bindings. The grammar looks like: .Bd -literal -offset indent file: /* empty */ sections includes sections: section sections section section: '[' section_name ']' bindings section_name: STRING bindings: binding bindings binding binding: name '=' STRING name '=' '{' bindings '}' name: STRING includes: 'include' path 'includedir' path path: STRING .Ed .Li STRINGs consists of one or more non-whitespace characters. .Pp Files and directories may be included by absolute path, with percent token expansion (see the TOKEN EXPANSION section). Including a directory causes all files in the directory to be included as if each file had been included separately, but only files whose names consist of alphanumeric, hyphen, and underscore are included, though they may also end in '.conf'. .Pp STRINGs that are specified later in this man-page uses the following notation. .Bl -tag -width "xxx" -offset indent .It boolean values can be either yes/true or no/false. .It time values can be a list of year, month, day, hour, min, second. Example: 1 month 2 days 30 min. If no unit is given, seconds is assumed. .It etypes valid encryption types are: des-cbc-crc, des-cbc-md4, des-cbc-md5, des3-cbc-sha1, arcfour-hmac-md5, aes128-cts-hmac-sha1-96, aes256-cts-hmac-sha1-96, aes128-cts-hmac-sha256-128, and aes256-cts-hmac-sha384-192. .It address an address can be either a IPv4 or a IPv6 address. .El .Pp Currently recognised sections and bindings are: .Bl -tag -width "xxx" -offset indent .It Li [appdefaults] Specifies the default values to be used for Kerberos applications. You can specify defaults per application, realm, or a combination of these. The preference order is: .Bl -enum -compact .It .Va application Va realm Va option .It .Va application Va option .It .Va realm Va option .It .Va option .El .Pp The supported options are: .Bl -tag -width "xxx" -offset indent .It Li forwardable = Va boolean When obtaining initial credentials, make the credentials forwardable. .It Li proxiable = Va boolean When obtaining initial credentials, make the credentials proxiable. .It Li no-addresses = Va boolean When obtaining initial credentials, request them for an empty set of addresses, making the tickets valid from any address. .It Li ticket_lifetime = Va time Default ticket lifetime. .It Li renew_lifetime = Va time Default renewable ticket lifetime. .It Li encrypt = Va boolean Use encryption, when available. .It Li forward = Va boolean Forward credentials to remote host (for .Xr rsh 1 , .Xr telnet 1 , etc). .It Li historical_anon_pkinit = Va boolean Enable legacy anonymous pkinit command-line syntax. With this option set to .Li true, the .Xr kinit 1 .Fl Fl anonymous command with no principal argument specified will request an anonymous pkinit ticket from the default realm. If a principal argument is specified, it is used as an explicit realm name for anonymous pkinit even without an .Li @ prefix. .It Li delegate-destination-tgt = Va boolean When forwarding credentials to a remote host, forward a TGT for the realm of the destination host rather than a TGT for the user's realm. This is useful when hosts in the remote realm should not or cannot (e.g. firewalled from user realm's KDC) obtain tickets for services in the user's realm. When the user's realm and the host's realm are the same, this parameter has no effect. The setting can be applied to a single realm as follows: .Bd -literal -offset indent EXAMPLE.COM = { delegate-destination-tgt = true } .Ed .El .It Li [libdefaults] .Bl -tag -width "xxx" -offset indent .It Li default_realm = Va REALM Default realm to use, this is also known as your .Dq local realm . The default is the result of .Fn krb5_get_host_realm "local hostname" . .It Li allow_weak_crypto = Va boolean are weak crypto algorithms allowed to be used, among others, DES is considered weak. .It Li clockskew = Va time Maximum time differential (in seconds) allowed when comparing times. Default is 300 seconds (five minutes). .It Li kdc_timeout = Va time Maximum time to wait for a reply from the kdc, default is 3 seconds. .It Li capath = { .Bl -tag -width "xxx" -offset indent .It Va destination-realm Li = Va next-hop-realm .It ... .It Li } .El This is deprecated, see the .Li capaths section below. .It Li default_cc_type = Va cctype sets the default credentials type. .It Li default_cc_name = Va ccname the default credentials cache name. If you want to change the type only use .Li default_cc_type . The string can contain variables that are expanded at runtime. See the TOKEN EXPANSION section. .It Li default_file_cache_collections = Va FILE:/path/with/tokens ... This multi-valued parameter allows more than one path to be configured for the FILE credentials cache type to look in. The FILE credentials cache type will also consider file names whose prefixes match these and end in .Va +name as subsidiary caches in the collection. The values of this parameter are subject to token expansion. See the TOKEN EXPANSION section. .It Li enable_file_cache_iteration = Va boolean If enabled, the .Va FILE credential cache type will support iteration of all subsidiary caches in the default collection, meaning that .Xr kinit 1 .Va -l option will list them. This does require scanning the directory containing a given .Va FILE ccache, which, if it is .Va /tmp may be a slow operation. Defaults to false. .It Li default_etypes = Va etypes ... A list of default encryption types to use. (Default: all enctypes if allow_weak_crypto = TRUE, else all enctypes except single DES enctypes.) .It Li default_as_etypes = Va etypes ... A list of default encryption types to use in AS requests. (Default: the value of default_etypes.) .It Li default_tgs_etypes = Va etypes ... A list of default encryption types to use in TGS requests. (Default: the value of default_etypes.) .It Li default_etypes_des = Va etypes ... A list of default encryption types to use when requesting a DES credential. .It Li default_keytab_name = Va keytab The keytab to use if no other is specified, default is .Dq FILE:/etc/krb5.keytab . .It Li default_client_keytab_name = Va keytab The keytab to use for client credential acquisition if no other is specified, default is .Dq FILE:%{LOCALSTATEDIR}/user/%{euid}/client.keytab . See the TOKEN EXPANSION section. .It Li dns_lookup_kdc = Va boolean Use DNS SRV records to lookup KDC services location. .It Li dns_lookup_realm = Va boolean Use DNS TXT records to lookup domain to realm mappings. .It Li enforce_ok_as_delegate = Va boolean If this flag to true, GSSAPI credential delegation will be disabled when the .Ar ok-as-delegate flag is not set in the service ticket. If this flag is false, the .Ar ok-as-delegate ticket flag is only enforced when an application specifically requests enforcement. The default value is false. .It Li kdc_timesync = Va boolean Try to keep track of the time differential between the local machine and the KDC, and then compensate for that when issuing requests. .It Li max_retries = Va number The max number of times to try to contact each KDC. .It Li large_msg_size = Va number The threshold where protocols with tiny maximum message sizes are not considered usable to send messages to the KDC. .It Li ticket_lifetime = Va time Default ticket lifetime. .It Li renew_lifetime = Va time Default renewable ticket lifetime. .It Li forwardable = Va boolean When obtaining initial credentials, make the credentials forwardable. This option is also valid in the [realms] section. .It Li proxiable = Va boolean When obtaining initial credentials, make the credentials proxiable. This option is also valid in the [realms] section. .It Li verify_ap_req_nofail = Va boolean If enabled, failure to verify credentials against a local key is a fatal error. The application has to be able to read the corresponding service key for this to work. Some applications, like .Xr su 1 , enable this option unconditionally. .It Li warn_pwexpire = Va time How soon to warn for expiring password. Default is seven days. .It Li http_proxy = Va proxy-spec A HTTP-proxy to use when talking to the KDC via HTTP. .It Li dns_proxy = Va proxy-spec Enable using DNS via HTTP. .It Li extra_addresses = Va address ... A list of addresses to get tickets for along with all local addresses. .It Li time_format = Va string How to print time strings in logs, this string is passed to .Xr strftime 3 . .It Li date_format = Va string How to print date strings in logs, this string is passed to .Xr strftime 3 . .It Li log_utc = Va boolean Write log-entries using UTC instead of your local time zone. .It Li scan_interfaces = Va boolean Scan all network interfaces for addresses, as opposed to simply using the address associated with the system's host name. .It Li fcache_version = Va int Use file credential cache format version specified. .It Li fcc-mit-ticketflags = Va boolean Use MIT compatible format for file credential cache. It's the field ticketflags that is stored in reverse bit order for older than Heimdal 0.7. Setting this flag to .Dv TRUE makes it store the MIT way, this is default for Heimdal 0.7. .It Li check-rd-req-server If set to "ignore", the framework will ignore any of the server input to .Xr krb5_rd_req 3 , this is very useful when the GSS-API server input the wrong server name into the gss_accept_sec_context call. .It Li k5login_directory = Va directory Alternative location for user .k5login files. This option is provided for compatibility with MIT krb5 configuration files. This path is subject to percent token expansion (see TOKEN EXPANSION). .It Li k5login_authoritative = Va boolean If true then if a principal is not found in k5login files then .Xr krb5_userok 3 will not fallback on principal to username mapping. This option is provided for compatibility with MIT krb5 configuration files. .It Li kuserok = Va rule ... Specifies .Xr krb5_userok 3 behavior. If multiple values are given, then .Xr krb5_userok 3 will evaluate them in order until one succeeds or all fail. Rules are implemented by plugins, with three built-in plugins described below. Default: USER-K5LOGIN SIMPLE DENY. .It Li kuserok = Va DENY If set and evaluated then .Xr krb5_userok 3 will deny access to the given username no matter what the principal name might be. .It Li kuserok = Va SIMPLE If set and evaluated then .Xr krb5_userok 3 will use principal to username mapping (see auth_to_local below). If the principal maps to the requested username then access is allowed. .It Li kuserok = Va SYSTEM-K5LOGIN[:directory] If set and evaluated then .Xr krb5_userok 3 will use k5login files named after the .Va luser argument to .Xr krb5_userok 3 in the given directory or in .Pa /etc/k5login.d/ . K5login files are text files, with each line containing just a principal name; principals apearing in a user's k5login file are permitted access to the user's account. Note: this rule performs no ownership nor permissions checks on k5login files; proper ownership and permissions/ACLs are expected due to the k5login location being a system location. .It Li kuserok = Va USER-K5LOGIN If set and evaluated then .Xr krb5_userok 3 will use .Pa ~luser/.k5login and .Pa ~luser/.k5login.d/* . User k5login files and directories must be owned by the user and must not have world nor group write permissions. .It Li aname2lname-text-db = Va filename The named file must be a sorted (in increasing order) text file where every line consists of an unparsed principal name optionally followed by whitespace and a username. The aname2lname function will do a binary search on this file, if configured, looking for lines that match the given principal name, and if found the given username will be used, or, if the username is missing, an error will be returned. If the file doesn't exist, or if no matching line is found then other plugins will be allowed to run. .It Li fcache_strict_checking strict checking in FILE credential caches that owner, no symlink and permissions is correct. .It Li moduli = Va FILE Names a file that contains acceptable modular Diffie-Hellman groups for PKINIT. The given file should contain lines with whitespace-separated fields in this order: .Va name, nbits, p, g, q . Lines starting with a .Va # are comments. .It Li pkinit_dh_min_bits = Va NUMBER PKINIT client's minimum acceptable modular Diffie-Hellman public key size in bits. .It Li enable-kx509 = Va boolean Enable use of kx509 so that every TGT that can has a corresponding PKIX certificate. Default: false. .It Li kx509_gen_key_type = Va public-key-type Type of public key for kx509 private key generation. Defaults to .Va rsa and currently only .Va rsa is supported. .It Li kx509_gen_rsa_key_size = Va number-of-bits RSA key size for kx509. Defaults to 2048. .It Li kx509_store = path A file path into which to write a certificate obtained with kx509, and its private key, when attempting kx509 optimistically using credentials from a default ccache. Tokens will be expanded. .It Li kx509_hostname = Va hostname If set, then the kx509 client will use this hostname for the kx509 service. This can also be set in the .Li [realm] section on a per-realm basis. If not set then a TGS name will be used. .It Li name_canon_rules = Va rules One or more service principal name canonicalization rules. Each rule consists of one or more tokens separated by colon (':'). Currently these rules are used only for hostname canonicalization (usually when getting a service ticket, from a ccache or a TGS, but also when acquiring GSS initiator credentials from a keytab). These rules can be used to implement DNS resolver-like search lists without having to use DNS. .Pp NOTE: Name canonicalization rules are an experimental feature. .Pp The first token is a rule type, one of: .Va as-is, .Va qualify, or .Va nss. .Pp Any remaining tokens must be options tokens: .Va use_fast (use FAST to protect TGS exchanges; currently not supported), .Va use_dnssec (use DNSSEC to protect hostname lookups; currently not supported), .Va ccache_only , .Va use_referrals, .Va no_referrals, .Va lookup_realm, .Va mindots=N, .Va maxdots=N, .Va order=N, domain= .Va domain, realm= .Va realm, match_domain= .Va domain, and match_realm= .Va realm. .Pp When trying to obtain a service ticket for a host-based service principal name, name canonicalization rules are applied to that name in the order given, one by one, until one succeds (a service ticket is obtained), or all fail. Similarly when acquiring GSS initiator credentials from a keytab, and when comparing a non-canonical GSS name to a canonical one. .Pp For each rule the system checks that the hostname has at least .Va mindots periods (if given) in it, at most .Va maxdots periods (if given), that the hostname ends in the given .Va match_domain (if given), and that the realm of the principal matches the .Va match_realm (if given). .Pp .Va As-is rules leave the hostname unmodified but may set a realm. .Va Qualify rules qualify the hostname with the given .Va domain and also may set the realm. The .Va nss rule uses the system resolver to lookup the host's canonical name and is usually not secure. Note that using the .Va nss rule type implies having to have principal aliases in the HDB (though not necessarily in keytabs). .Pp The empty realm denotes "ask the client's realm's TGS". The empty realm may be set as well as matched. .Pp The order in which rules are applied is as follows: first all the rules with explicit .Va order then all other rules in the order in which they appear. If any two rules have the same explicit .Va order , their order of appearance in krb5.conf breaks the tie. Explicitly specifying order can be useful where tools read and write the configuration file without preserving parameter order. .Pp Malformed rules are ignored. .It Li allow_hierarchical_capaths = Va boolean When validating cross-realm transit paths, absent any explicit capath from the client realm to the server realm, allow a hierarchical transit path via the common ancestor domain of the two realms. Defaults to true. Note, absent an explicit setting, hierarchical capaths are always used by the KDC when generating a referral to a destination with which is no direct trust. .It Li client_aware_channel_bindings = Va boolean If this flag is true, then all application protocol authentication requests will be flagged to indicate that the application supports channel bindings when operating over a secure channel. The default value is false. .It Li check_pac = Va boolean If this flag is true and a Windows Privilege Attribute Certificate (PAC) is present in the ticket authorization data, then .Xr krb5_rd_req 3 will validate the PAC before returning success. The default value is true. .It Li report_canonical_client_name = Va boolean If this flag is true, then the canonical client name from the PAC will be used instead of the client name in the ticket. The default value is false. Note that setting it to true implicitly sets .Va check_pac to true. .El .It Li [domain_realm] This is a list of mappings from DNS domain to Kerberos realm. .Pp It is used by the client and the TGS both to determine the realm of host-based service principal names based on the principal's hostname component. .Pp The client may try DNS to determine a host's realm; see the `dns_lookup_realm' parameter, and see below. .Pp The TGS will issue a referral when a host-based service does not exist in the requested realm but can be mapped with these rules to a different realm. The TGS will also issue a referral when a host-based service exists in the requested realm as an alias of a service in another realm. .Pp Each binding in this section looks like: .Pp .Dl domain = realm .Pp The domain can be either a full name of a host or a trailing component, in the latter case the domain-string should start with a period. The trailing component only matches hosts that are in the same domain, ie .Dq .example.com matches .Dq foo.example.com , but not .Dq foo.test.example.com . .Pp The realm may be the token `dns_locate', in which case the actual realm will be determined using DNS (independently of the setting of the `dns_lookup_realm' option). .It Li [realms] .Bl -tag -width "xxx" -offset indent .It Va REALM Li = { .Bl -tag -width "xxx" -offset indent .It Li kdc = Va [service/]host[:port] Specifies a list of kdcs for this realm. If the optional .Va port is absent, the default value for the .Dq kerberos/udp .Dq kerberos/tcp , and .Dq http/tcp port (depending on service) will be used. The kdcs will be used in the order that they are specified. .Pp The optional .Va service specifies over what medium the kdc should be contacted. Possible services are .Dq udp , .Dq tcp , and .Dq http . Http can also be written as .Dq http:// . Default service is .Dq udp and .Dq tcp . .It Li admin_server = Va host[:port] Specifies the admin server for this realm, where all the modifications to the database are performed. .It Li kpasswd_server = Va host[:port] Points to the server where all the password changes are performed. If there is no such entry, the kpasswd port on the admin_server host will be tried. .It Li tgs_require_subkey a boolan variable that defaults to false. Old DCE secd (pre 1.1) might need this to be true. .It Li auth_to_local_names = { .Bl -tag -width "xxx" -offset indent .It Va principal_name = Va username The given .Va principal_name will be mapped to the given .Va username if the .Va REALM is a default realm. .El .It Li } .It Li auth_to_local = HEIMDAL_DEFAULT Use the Heimdal default principal to username mapping. Applies to principals from the .Va REALM if and only if .Va REALM is a default realm. .It Li auth_to_local = DEFAULT Use the MIT default principal to username mapping. Applies to principals from the .Va REALM if and only if .Va REALM is a default realm. .It Li auth_to_local = DB:/path/to/db.txt Use a binary search of the given DB. The DB must be a flat-text file sortedf in the "C" locale, with each record being a line (separated by either LF or CRLF) consisting of a principal name followed by whitespace followed by a username. Applies to principals from the .Va REALM if and only if .Va REALM is a default realm. .It Li auth_to_local = DB:/path/to/db Use the given DB, if there's a plugin for it. Applies to principals from the .Va REALM if and only if .Va REALM is a default realm. .It Li auth_to_local = RULE:... Use the given rule, if there's a plugin for it. Applies to principals from the .Va REALM if and only if .Va REALM is a default realm. .It Li auth_to_local = NONE No additional principal to username mapping is done. Note that .Va auth_to_local_names and any preceding .Va auth_to_local rules have precedence. .It Li pkinit_require_eku = BOOL If .Va true then the KDC PKINIT Extended Key Usage (EKU) OID (1.3.6.5.2.3.5) must be present in KDCs' PKINIT certificates. Defaults to .Va true . .It Li pkinit_require_krbtgt_otherName = BOOL If .Va true then the PKINIT Subject Alternative Name (SAN) for the TGS must be present in KDCs' PKINIT certificates, and must match their realm. Defaults to .Va true . .It Li pkinit_require_hostname_match = BOOL If .Va true then KDCs' PKINIT certificates must match their hostnames. Defaults to .Va false . .It Li pkinit_trustedCertifiers = BOOL If .Va true then PKINIT client will tell KDCs which trust anchors it trusts. Defaults to .Va true . .It Li disable_pac = BOOL If .Va true then the KDC will not sign tickets with PAC, which disables S4U2Proxy support. Defaults to .Va false . .El .It Li } .El .It Li [capaths] .Bl -tag -width "xxx" -offset indent .It Va client-realm Li = { .Bl -tag -width "xxx" -offset indent .It Va server-realm Li = Va hop-realm ... This serves two purposes. First the first listed .Va hop-realm tells a client which realm it should contact in order to ultimately obtain credentials for a service in the .Va server-realm . Secondly, it tells the KDC (and other servers) which realms are allowed in a multi-hop traversal from .Va client-realm to .Va server-realm . Except for the client case, the order of the realms are not important. .El .It Va } .El .It Li [logging] .Bl -tag -width "xxx" -offset indent .It Va entity Li = Va destination Specifies that .Va entity should use the specified .Li destination for logging. See the .Xr krb5_openlog 3 manual page for a list of defined destinations. .El .It Li [kdc] .Bl -tag -width "xxx" -offset indent .It Li database Li = { .Bl -tag -width "xxx" -offset indent .It Li dbname Li = Va [DATBASETYPE:]DATABASENAME Use this database for this realm. The .Va DATABASETYPE should be one of 'lmdb', 'db3', 'db1', 'db', 'sqlite', or 'ldap'. See the info documetation how to configure different database backends. .It Li realm Li = Va REALM Specifies the realm that will be stored in this database. It realm isn't set, it will used as the default database, there can only be one entry that doesn't have a .Li realm stanza. .It Li mkey_file Li = Pa FILENAME Use this keytab file for the master key of this database. If not specified .Va DATABASENAME Ns .mkey will be used. .It Li acl_file Li = PA FILENAME Use this file for the ACL list of this database. .It Li log_file Li = Pa FILENAME Use this file as the log of changes performed to the database. This file is used by .Nm ipropd-master for propagating changes to slaves. It is also used by .Nm kadmind and .Nm kadmin (when used with the .Li -l option), and by all applications using .Nm libkadm5 with the local backend, for two-phase commit functionality. Slaves also use this. Setting this to .Nm /dev/null disables two-phase commit and incremental propagation. Use .Nm iprop-log to show the contents of this log file. .It Li log-max-size = Pa number When the log reaches this size (in bytes), the log will be truncated, saving some entries, and keeping the latest version number so as to not disrupt incremental propagation. If set to a negative value then automatic log truncation will be disabled. Defaults to 52428800 (50MB). .El .It Li } .It Li max-request = Va SIZE Maximum size of a kdc request. .It Li require-preauth = Va BOOL If set pre-authentication is required. .It Li ports = Va "list of ports" List of ports the kdc should listen to. .It Li addresses = Va "list of interfaces" List of addresses the kdc should bind to. .It Li enable-http = Va BOOL Should the kdc answer kdc-requests over http. .It Li tgt-use-strongest-session-key = Va BOOL If this is TRUE then the KDC will prefer the strongest key from the client's AS-REQ or TGS-REQ enctype list for the ticket session key that is supported by the KDC and the target principal when the target principal is a krbtgt principal. Else it will prefer the first key from the client's AS-REQ enctype list that is also supported by the KDC and the target principal. Defaults to FALSE. .It Li svc-use-strongest-session-key = Va BOOL Like tgt-use-strongest-session-key, but applies to the session key enctype of tickets for services other than krbtgt principals. Defaults to FALSE. .It Li preauth-use-strongest-session-key = Va BOOL If TRUE then select the strongest possible enctype from the client's AS-REQ for PA-ETYPE-INFO2 (i.e., for password-based pre-authentication). Else pick the first supported enctype from the client's AS-REQ. Defaults to FALSE. .It Li use-strongest-server-key = Va BOOL If TRUE then the KDC picks, for the ticket encrypted part's key, the first supported enctype from the target service principal's hdb entry's current keyset. Else the KDC picks the first supported enctype from the target service principal's hdb entry's current keyset. Defaults to TRUE. .It Li check-ticket-addresses = Va BOOL Verify the addresses in the tickets used in tgs requests. .\" XXX .It Li warn_ticket_addresses = Va BOOL Warn about, but allow, usage of tickets from hosts that don't match the addresses in the tickets. .It Li allow-null-ticket-addresses = Va BOOL Allow address-less tickets. .\" XXX .It Li enable_fast = Va BOOL Enable RFC 6113 FAST support, this is enabled by default. .It Li enable_armored_pa_enc_timestamp = Va BOOL Enable armored encrypted timestamp pre-authentication with key strengthening. RFC 6113 says not to use PA-ENC-TIMESTAMP in FAST armored tunnels as there is a newer replacement, PA-ENC-CHALLENGE, but for interoperability with earlier versions of Heimdal, this is enabled by default for now. .It Li enable_unarmored_pa_enc_timestamp = Va BOOL Enable unarmored encrypted timestamp pre-authentication. Enabled by default for now, but in a future release will be disabled. .It Li enable-pkinit = Va BOOL Enable PKINIT (disabled by default). .It Li allow-anonymous = Va BOOL If the kdc is allowed to hand out anonymous tickets. .It Li synthetic_clients = Va BOOL If enabled then the KDC will issue tickets for clients that don't exist in the HDB provided that they use PKINIT, that PKINIT is enabled, and that the client's have certificates with PKINIT subject alternative names (SANs). .It Li synthetic_clients_max_life = Va TIME Maximum ticket lifetime for synthetic clients. Default: 5 minutes. .It Li synthetic_clients_max_renew = Va TIME Maximum ticket renewable lifetime for synthetic clients. Default: 5 minutes. .It Li pkinit_identity = Va HX509-STORE This is an HX509 store containing the KDC's PKINIT credential (private key and end-entity certificate). This is single valued, though multiple stores can be specified by separating them with commas. An .Va HX509-STORE is of the form .Va TYPE:name where .Va TYPE is one of .Va FILE, Va PEM-FILE, Va DER-FILE, Va PKCS12, Va PKCS11, or on OX X, .Va KEYCHAIN . The form of the .Va name depends on the .Va TYPE . For .Va FILE, Va PEM-FILE, Va DER-FILE, and .Va PKCS12 the .Va name is a file path. See the Heimdal hx509 documentation for more information. .It Li pkinit_pool = Va HX509-STORE This is a multi-valued parameter naming one or more stores of intermediate certification authority (CA) certificates for the KDC's end entity certificate. .It Li pkinit_anchors = Va HX509-STORE This is a multi-valued parameter naming one or more stores of anchors for PKINIT client certificates. Note that the .Va DIR type of .Va HX509-STORE is also supported here. .Va DIR type stores are OpenSSL-style CA certificate hash directories. .It Li pkinit_kdc_ocsp = Va PATH This names a file whose contents is the DER encoding of an OCSPResponse for the KDC's end entity certificate. .It Li pkinit_kdc_friendly_name = Va NAME This is an optional friendly name of the KDC's end entity certificate. This is only helpful when the .Li pkinit_identity store contains many credentials. .It Li pkinit_principal_in_certificate = Va BOOL If set to .Va true then the KDC will match AS-REQ client principal names to the PKINIT .Va subjectAlternativeName values from the clients' certificates. Defaults to .Va true . .It Li pkinit_dh_min_bits = Va NUMBER Minimum acceptable modular Diffie-Hellman public key size in bits. .It Li pkinit_max_life_from_cert_extension = Va BOOL If set to .Va true then the KDC will override the .Va max_life attribute of the client principal's HDB record with a maximum ticket life taken from a certificate extension with OID .Va { iso(1) member-body(2) se(752) su(43) heim-pkix(16) 4 } and the DER encoding of an .Va INTEGER number of seconds. Alternatively, if the extended key usage OID .Va { iso(1) member-body(2) se(752) su(43) heim-pkix(16) 3 } is included in the client's certificate, then the .Va notAfter minus the current time will be used. .It Li pkinit_max_life_bound = Va TIME If set, this will be a hard bound on the maximum ticket lifetime taken from the client's certificate. As usual, .Va TIME can be given as a number followed by a unit, such as .Dq 2d for .Dq two days . .It Li pkinit_max_life_from_cert = Va TIME If set, this will override the .Va max_life attribute of the client principal's HDB record with the .Va notAfter of the client's certificate minus the current time, bounded to the given relative .Va TIME unless the .Li pkinit_max_life_from_cert_extension parameter is set and the client's certificate has that extension. As usual, .Va TIME can be given as a number followed by a unit, such as .Dq 2d for .Dq two days . .It Li enable_gss_preauth = Va boolean Enables pre-authentication using a GSS-API mechanism supported by the client and KDC. The GSS-API initiator and AS request client names must match, unless the .Li WELLKNOWN/FEDERATED name was used in the AS request, in which case the AS reply will contain the GSS-API initiator name. Authorization and mapping behavior may be customized by plugins. If synthetic clients are enabled, then the GSS-API initiator need not exist in the local database. GSS-API pre-authentication is disabled by default. .It Li enable_gss_auth_data = Va boolean When using GSS-API pre-authentication, includes a Kerberos authorization data element containing naming attributes associated with the GSS-API initiator. This is disabled by default as it may significantly increase the size of returned tickets. .It Li gss_mechanisms_allowed = Va mechs ... A list of GSS-API mechanisms that may be used for GSS-API pre-authentication. .It Li gss_cross_realm_mechanisms_allowed = Va mechs ... A list of GSS-API mechanisms that, when using the default authorization mechanism, will be permitted to map Kerberos principals in foreign realms. The list is empty by default. Initiator names from mechanisms not on this list will be mapped to an enterprise principal in the AS-REQ realm. This option is intended to avoid conflating GSS-API pre-authentication and Kerberos cross-realm authentication. The behavior is provided by the default authorization mechanism and will be overridden by an authorization plugin. Mechanisms may be identified by dot-separated OID or a short name. .It Li historical_anon_realm = Va boolean Enables pre-7.0 non-RFC-comformant KDC behavior. With this option set to .Li true the client realm in anonymous pkinit AS replies will be the requested realm, rather than the RFC-conformant .Li WELLKNOWN:ANONYMOUS realm. This can have a security impact on servers that expect to grant access to anonymous-but-authenticated to the KDC users of the realm in question: they would also grant access to unauthenticated anonymous users. As such, it is not recommend to set this option to .Li true. .It Li encode_as_rep_as_tgs_rep = Va BOOL Encode as-rep as tgs-rep to be compatible with mistakes older DCE secd did. .\" XXX .It Li kdc_warn_pwexpire = Va TIME The time before expiration that the user should be warned that her password is about to expire. .It Li logging = Va Logging What type of logging the kdc should use, see also [logging]/kdc. .It Li hdb-ldap-structural-object Va structural object If the LDAP backend is used for storing principals, this is the structural object that will be used when creating and when reading objects. The default value is account . .It Li hdb-ldap-create-base Va creation dn is the dn that will be appended to the principal when creating entries. Default value is the search dn. .It Li enable-digest = Va BOOL Should the kdc answer digest requests. The default is FALSE. .It Li digests_allowed = Va list of digests Specifies the digests the kdc will reply to. The default is .Li ntlm-v2 . .It Li enable-kx509 = Va boolean Enables kx509 service. .Pp The kx509 service is configurable for a number of cases: .Bl -tag -width "" -offset indent .It Li default certificates for user or service principals, .It Li non-default certificate requests including subject alternative names (SAN) and extended key usage (EKU) certificate extensions, for either client, server, or mixed usage. .El .Pp Distinct configurations are supported for all of these cases as shown below: .Bd -literal -offset indent [kdc] enable-kx509 = yes | no require_csr = yes | no require_initial_kca_tickets = yes | no realm = { = { kx509 = {