KRB5.CONF(5) NetBSD File Formats Manual KRB5.CONF(5)
NAME
krb5.conf -- configuration file for Kerberos 5
SYNOPSIS
#include <krb5/krb5.h>
DESCRIPTION
The krb5.conf file specifies several configuration parameters for the Kerberos 5 library, as well as for some programs. The file consists of one or more sections, containing a number of bind- ings. The value of each binding can be either a string or a list of other bindings. The grammar looks like: file: /* empty */ sections sections: section sections section section: '[' section_name ']' bindings section_name: STRING bindings: binding bindings binding binding: name '=' STRING name '=' '{' bindings '}' name: STRING STRINGs consists of one or more non-whitespace characters. STRINGs that are specified later in this man-page uses the following notation. boolean values can be either yes/true or no/false. time values can be a list of year, month, day, hour, min, second. Example: 1 month 2 days 30 min. 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, and aes256-cts-hmac-sha1-96 . address an address can be either a IPv4 or a IPv6 address. Currently recognised sections and bindings are: [appdefaults] Specifies the default values to be used for Kerberos applica- tions. You can specify defaults per application, realm, or a combination of these. The preference order is: 1. application realm option 2. application option 3. realm option 4. option The supported options are: forwardable = boolean When obtaining initial credentials, make the cre- dentials forwardable. proxiable = boolean When obtaining initial credentials, make the cre- dentials proxiable. no-addresses = boolean When obtaining initial credentials, request them for an empty set of addresses, making the tickets valid from any address. ticket_lifetime = time Default ticket lifetime. renew_lifetime = time Default renewable ticket lifetime. encrypt = boolean Use encryption, when available. forward = boolean Forward credentials to remote host (for rsh(1), telnet(1), etc). [libdefaults] default_realm = REALM Default realm to use, this is also known as your ``local realm''. The default is the result of krb5_get_host_realm(local hostname). clockskew = time Maximum time differential (in seconds) allowed when comparing times. Default is 300 seconds (five min- utes). kdc_timeout = time Maximum time to wait for a reply from the kdc, default is 3 seconds. v4_name_convert v4_instance_resolve These are described in the krb5_425_conv_principal(3) manual page. capath = { destination-realm = next-hop-realm ... } This is deprecated, see the capaths section below. default_etypes = etypes ... A list of default encryption types to use. default_etypes_des = etypes ... A list of default encryption types to use when requesting a DES credential. default_keytab_name = keytab The keytab to use if no other is specified, default is ``FILE:/etc/krb5.keytab''. dns_lookup_kdc = boolean Use DNS SRV records to lookup KDC services loca- tion. dns_lookup_realm = boolean Use DNS TXT records to lookup domain to realm map- pings. kdc_timesync = boolean Try to keep track of the time differential between the local machine and the KDC, and then compensate for that when issuing requests. max_retries = number The max number of times to try to contact each KDC. ticket_lifetime = time Default ticket lifetime. renew_lifetime = time Default renewable ticket lifetime. forwardable = boolean When obtaining initial credentials, make the cre- dentials forwardable. This option is also valid in the [realms] section. proxiable = boolean When obtaining initial credentials, make the cre- dentials proxiable. This option is also valid in the [realms] section. verify_ap_req_nofail = 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 su(1), enable this option unconditionally. warn_pwexpire = time How soon to warn for expiring password. Default is seven days. http_proxy = proxy-spec A HTTP-proxy to use when talking to the KDC via HTTP. dns_proxy = proxy-spec Enable using DNS via HTTP. extra_addresses = address ... A list of addresses to get tickets for along with all local addresses. time_format = string How to print time strings in logs, this string is passed to strftime(3). date_format = string How to print date strings in logs, this string is passed to strftime(3). log_utc = boolean Write log-entries using UTC instead of your local time zone. scan_interfaces = boolean Scan all network interfaces for addresses, as opposed to simply using the address associated with the system's host name. fcache_version = int Use file credential cache format version specified. krb4_get_tickets = boolean Also get Kerberos 4 tickets in kinit, login, and other programs. This option is also valid in the [realms] section. fcc-mit-ticketflags = 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 TRUE make it store the MIT way, this is default for Heimdal 0.7. [domain_realm] This is a list of mappings from DNS domain to Kerberos realm. Each binding in this section looks like: domain = realm 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 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). [realms] REALM = { kdc = [service/]host[:port] Specifies a list of kdcs for this realm. If the optional port is absent, the default value for the ``kerberos/udp'' ``kerberos/tcp'', and ``http/tcp'' port (depending on service) will be used. The kdcs will be used in the order that they are specified. The optional service specifies over what medium the kdc should be contacted. Possible services are ``udp'', ``tcp'', and ``http''. Http can also be written as ``http://''. Default service is ``udp'' and ``tcp''. admin_server = host[:port] Specifies the admin server for this realm, where all the modifications to the database are performed. kpasswd_server = host[:port] Points to the server where all the pass- word changes are performed. If there is no such entry, the kpasswd port on the admin_server host will be tried. krb524_server = host[:port] Points to the server that does 524 con- versions. If it is not mentioned, the krb524 port on the kdcs will be tried. v4_instance_convert v4_name_convert default_domain See krb5_425_conv_principal(3). tgs_require_subkey a boolan variable that defaults to false. Old DCE secd (pre 1.1) might need this to be true. } [capaths] client-realm = { server-realm = hop-realm ... This serves two purposes. First the first listed hop-realm tells a client which realm it should contact in order to ultimately obtain credentials for a service in the server-realm. Secondly, it tells the KDC (and other servers) which realms are allowed in a multi-hop traversal from client-realm to server-realm. Except for the client case, the order of the realms are not important. } [logging] entity = destination Specifies that entity should use the specified destination for logging. See the krb5_openlog(3) manual page for a list of defined destinations. [kdc] database = { dbname = DATABASENAME Use this database for this realm. realm = REALM Specifies the realm that will be stored in this database. mkey_file = FILENAME Use this keytab file for the master key of this database. If not specified DATABASENAME.mkey will be used. acl_file = PA FILENAME Use this file for the ACL list of this database. log_file = FILENAME Use this file as the log of changes per- formed to the database. This file is used by ipropd-master for propagating changes to slaves. } max-request = SIZE Maximum size of a kdc request. require-preauth = BOOL If set pre-authentication is required. Since krb4 requests are not pre-authenticated they will be rejected. ports = list of ports List of ports the kdc should listen to. addresses = list of interfaces List of addresses the kdc should bind to. enable-kerberos4 = BOOL Turn on Kerberos 4 support. v4-realm = REALM To what realm v4 requests should be mapped. enable-524 = BOOL Should the Kerberos 524 converting facility be turned on. Default is same as enable-kerberos4. enable-http = BOOL Should the kdc answer kdc-requests over http. enable-kaserver = BOOL If this kdc should emulate the AFS kaserver. check-ticket-addresses = BOOL verify the addresses in the tickets used in tgs requests. allow-null-ticket-addresses = BOOL Allow addresses-less tickets. allow-anonymous = BOOL If the kdc is allowed to hand out anonymous tick- ets. encode_as_rep_as_tgs_rep = BOOL Encode as-rep as tgs-rep tobe compatible with mis- takes older DCE secd did. kdc_warn_pwexpire = TIME The time before expiration that the user should be warned that her password is about to expire. logging = Logging What type of logging the kdc should use, see also [logging]/kdc. use_2b = principal list List of principals to use AFS 2b tokens for. [kadmin] require-preauth = BOOL If pre-authentication is required to talk to the kadmin server. default_keys = keytypes... for each entry in default_keys try to parse it as a sequence of etype:salttype:salt syntax of this if something like: [(des|des3|etype):](pw-salt|afs3-salt)[:string] If etype is omitted it means everything, and if string is omitted it means the default salt string (for that principal and encryption type). Addi- tional special values of keytypes are: v5 The Kerberos 5 salt pw-salt v4 The Kerberos 4 salt des:pw-salt: use_v4_salt = BOOL When true, this is the same as default_keys = des3:pw-salt v4 and is only left for backwards compatibility.
ENVIRONMENT
KRB5_CONFIG points to the configuration file to read.
FILES
/etc/krb5.conf configuration file for Kerberos 5.
EXAMPLES
[libdefaults] default_realm = FOO.SE [domain_realm] .foo.se = FOO.SE .bar.se = FOO.SE [realms] FOO.SE = { kdc = kerberos.foo.se v4_name_convert = { rcmd = host } v4_instance_convert = { xyz = xyz.bar.se } default_domain = foo.se } [logging] kdc = FILE:/var/heimdal/kdc.log kdc = SYSLOG:INFO default = SYSLOG:INFO:USER
DIAGNOSTICS
Since krb5.conf is read and parsed by the krb5 library, there is not a lot of opportunities for programs to report parsing errors in any useful format. To help overcome this problem, there is a program verify_krb5_conf that reads krb5.conf and tries to emit useful diagnos- tics from parsing errors. Note that this program does not have any way of knowing what options are actually used and thus cannot warn about unknown or misspelled ones.
SEE ALSO
kinit(1), krb5_425_conv_principal(3), krb5_openlog(3), strftime(3), verify_krb5_conf(8) NetBSD 3.1.1 March 9, 2004 NetBSD 3.1.1
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