Provided by: libauthen-krb5-perl_1.9-6_amd64 
NAME
Authen::Krb5 - Perl extension for Kerberos 5
SYNOPSIS
use Authen::Krb5;
Authen::Krb5::init_context();
DESCRIPTION
Authen::Krb5 is an object oriented interface to the Kerberos 5 API. Both the
implementation and documentation are nowhere near complete, and may require previous
experience with Kerberos 5 programming. Most of the functions here are documented in
detail in the Kerberos 5 API documentation.
FUNCTIONS
error(n)
Returns the error code from the most recent Authen::Krb5 call. If provided with an
error code 'n', this function will return a textual description of the error.
init_context()
Initializes a context for the application. Returns a Authen::Krb5::Context object, or
undef if there was an error.
init_ets() (DEPRECATED)
Initializes the Kerberos error tables. Should be called along with init_context at
the beginning of a script.
get_default_realm()
Returns the default realm of your host.
get_host_realm(host)
Returns the realm of the specified host.
get_krbhst(realm)
Returns a list of the Kerberos servers from the specified realm.
build_principal_ext(p)
Not like the actual krb5_build_principal_ext. This is legacy code from Malcolm's
code, which I'll probably change in future releases. In any case, it creates a
'server' principal for use in getting a TGT. Pass it the principal for which you
would like a TGT.
parse_name(name)
Converts a string representation of a principal to a principal object. You can use
this to create a principal from your username.
sname_to_principal(hostname,sname,type)
Generates a server principal from the given hostname, service, and type. Type can be
one of the following: NT_UNKNOWN, NT_PRINCIPAL, NT_SRV_INST, NT_SRV_HST, NT_SRV_XHST,
NT_UID. See the Kerberos documentation for details.
cc_resolve(name)
Returns a credentials cache identifier which corresponds to the given name. 'name'
must be in the form TYPE:RESIDUAL. See the Kerberos documentation for more
information.
cc_default_name()
Returns the name of the default credentials cache, which may be equivalent to
KRB5CCACHE.
cc_default()
Returns a Authen::Krb5::Ccache object representing the default credentials cache.
kt_resolve(name)
Returns a Authen::Krb5::Keytab object representing the specified keytab name.
kt_default_name()
Returns a sting containing the default keytab name.
kt_default()
Returns an Authen::Krb5::Keytab object representing the default keytab.
kt_read_service_key(name, principal[, kvno, enctype])
Searches the keytab specified by name (the default keytab if name is undef) for a key
matching principal (and optionally kvno and enctype) and returns the key in the form
of an Authen::Krb5::Keyblock object.
get_init_creds_password(client, password[, service])
Attempt to get an initial ticket for the client. 'client' is a principal object for
which you want an initial ticket. 'password' is the password for the client.
'service', if given, is the string representation (not a principal object) for the
ticket to acquire. If not given, it defaults to krbtgt/REALM@REALM for the local
realm. Returns an Authen::Krb5::Creds object or undef on failure.
get_init_creds_keytab(client, keytab[, service])
Attempt to get an inintial ticket for the client using a keytab. 'client' is a
principal object for which you want an initial ticket. 'keytab' is a keytab object
created with kt_resolve. 'service', if given, is the string representation (not a
principal object) for the ticket to acquire. If not given, it defaults to
krbtgt/REALM@REALM for the local realm. Returns an Authen::Krb5::Creds object or
undef on failure.
get_in_tkt_with_password(client,server,password,cc)
Attempt to get an initial ticket for the client. 'client' is a principal object for
which you want an initial ticket. 'server' is a principal object for the service
(usually krbtgt/REALM@REALM). 'password' is the password for the client, and 'cc' is
a Authen::Krb5::Ccache object representing the current credentials cache. Returns a
Kerberos error code.
Although this interface is deprecated in the Kerberos C libraries, it's supported in
the Perl module. In this module, it's implemented in terms of
krb5_get_init_creds_password, krb5_cc_initialize, and krb5_cc_store_cred.
get_in_tkt_with_keytab(client,server,keytab,cc)
Obtain an initial ticket for the client using a keytab. 'client' is a principal
object for which you want an initial ticket. 'server' is a principal object for the
service (usually krbtgt/REALM@REALM). 'keytab' is a keytab object createed with
kt_resolve. 'cc' is a Authen::Krb5::Ccache object representing the current
credentials cache. Returns a Kerberos error code.
Although this interface is deprecated in the Kerberos C libraries, it's supported in
the Perl module. In this module, it's implemented in terms of
krb5_get_init_creds_keytab, krb5_cc_initialize, and krb5_cc_store_cred.
mk_req(auth_context,ap_req_options,service,hostname,in,cc)
Obtains a ticket for a specified service and returns a KRB_AP_REQ message suitable for
passing to rd_req. 'auth_context' is the Authen::Krb5::AuthContext object you want to
use for this connection, 'ap_req_options' is an OR'ed representation of the possible
options (see Kerberos docs), 'service' is the name of the service for which you want a
ticket (like 'host'), hostname is the hostname of the server, 'in' can be any user-
specified data that can be verified at the server end, and 'cc' is your credentials
cache object.
rd_req(auth_context,in,server,keytab)
Parses a KRB_AP_REQ message and returns its contents in a Authen::Krb5::Ticket object.
'auth_context' is the connection's Authen::Krb5::AuthContext object, 'in' is the
KRB_AP_REQ message (usually from mk_req), and server is the expected server's name for
the ticket. 'keytab' is a Authen::Krb5::Keytab object for the keytab you want to use.
Specify 'undef' or leave off to use the default keytab.
mk_priv(auth_context,in)
Encrypts 'in' using parameters specified in auth_context, and returns the encrypted
data. Requires use of a replay cache.
rd_priv(auth_context,in)
Decrypts 'in' using parameters specified in auth_context, and returns the decrypted
data.
sendauth(auth_context,fh,version,client,server,options,in,in_creds,cc)
Obtains and sends an authenticated ticket from a client program to a server program
using the filehandle 'fh'. 'version' is an application-defined version string that
recvauth compares to its own version string. 'client' is the client principal, e.g.
username@REALM. 'server' is the service principal to which you are authenticating,
e.g. service.hostname@REALM. The only useful option right now is
AP_OPTS_MUTUAL_REQUIRED, which forces sendauth to perform mutual authentication with
the server. 'in' is a string that will be received by recvauth and verified by the
server--it's up to the application. 'in_creds' is not yet supported, so just use
'undef' here. 'cc' should be set to the current credentials cache. sendauth returns
true on success and undefined on failure.
recvauth(auth_context,fh,version,server,keytab)
Receives authentication data from a client using the sendauth function through the
filehandle 'fh'. 'version' is as described in the sendauth section. 'server' is the
server principal to which the client will be authenticating. 'keytab' is a
Authen::Krb5::Keytab object specifying the keytab to use for this service. recvauth
returns a Authen::Krb5::Ticket object on success or undefined on failure.
genaddrs(auth_context,fh,flags)
Uses the open socket filehandle 'fh' to generate local and remote addresses for
auth_context. Flags should be one of the following, depending on the type of address
you want to generate (flags can be OR'ed):
KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR
KRB5_AUTH_CONTEXT_GENERATE_REMOTE_ADDR KRB5_AUTH_CONTEXT_GENERATE_REMOTE_FULL_ADDR
gen_portaddr(addr,port)
Generates a local port address that can be used to name a replay cache. 'addr' is a
Authen::Krb5::Address object, and port is a port number in network byte order. For
generateing a replay cache name, you should supply the local address of the client and
the socket's local port number. Returns a Authen::Krb5::Address object containing the
address.
gen_replay_name(addr,string)
Generate a unique replay cache name. 'addr' is a Authen::Krb5::Address object created
by gen_portaddr. 'string' is used as a unique identifier for the replay cache.
Returns the replay cache name.
get_server_rcache(name)
Returns a Authen::Krb5::Rcache object using the replay cache name 'name.'
CLASSES & METHODS
Authen::Krb5::Principal
Kerberos 5 princpal object.
o realm
Returns the realm of the principal.
o type
Returns the type of the principal.
o data
Returns a list containing the components of the principal (everything before the
realm).
Authen::Krb5::Ccache
Kerberos 5 credentials cache object.
o initialize(p)
Creates/refreshes a credentials cache for the primary principal 'p'. If the cache
already exists, its contents are destroyed.
o store_cred(creds)
Stores the given credentials, which should be an Authen::Krb5::Creds object as
returned from get_init_creds_password() or get_init_creds_keytab(), in the cache.
o get_name
Returns the name of the credentials cache.
o get_principal
Returns the primary principal of the credentials cache.
o destroy
Destroys the credentials cache and releases all resources it used.
o start_seq_get()
Returns a cursor that can be passed to next_cred() to read in turn every
credential in the cache.
o next_cred(cursor)
Returns the next credential in the cache as an Authen::Krb5::Creds object.
o end_seq_get(cursor)
Perform cleanup opreations after next_cred() and invalidates cursor.
Authen::Krb5::KeyBlock
Kerberos 5 keyblock object.
o enctype()
Returns the encryption type ID.
o enctype_string()
Returns a text description of the encryption type.
o length()
Returns the length of the session key.
o contents()
Returns the actual contents of the keyblock (the session key).
Authen::Krb5::AuthContext
Kerberos 5 auth_context object.
o new
Allocates memory for a new Authen::Krb5::AuthContext object and returns it.
o setaddrs(localaddr,remoteaddr)
Sets the local and remote addresses for the AuthContext object. 'localaddr' and
'remoteaddr' are Authen::Krb5::Address objects, usually of type ADDRTYPE_INET.
o getaddrs()
Returns a list containing the local and the remote address of the AuthContext
object.
o setrcache(rc)
Sets the replay cache for auth_context. 'rc' is a Authen::Krb5::Rcache object
generated by get_server_rcache.
o getkey()
Retrieves the session key as an Authen::Krb5::KeyBlock object.
Authen::Krb5::Ticket
Kerberos 5 ticket object.
o server
Returns the server stored in the ticket.
o enc_part2
Returns a Authen::Krb5::EncTktPart object representation of the ticket data. See
below.
Authen::Krb5::EncTktPart
Object representation of the krb5_enc_tkt_part structure.
o client
The client principal contained in the ticket.
Authen::Krb5::Keyblock
Object representation of the krb5_keyblock structure.
o enctype
The integral enctype of the key.
o length
Length of the key.
o contents
Contents of the key itself, as a string.
Authen::Krb5::Keytab
o add_entry(entry)
Adds entry to the keytab.
o remove_entry(entry)
Removes entry from the keytab.
o get_name()
Returns the name of the keytab.
o get_entry(principal[, kvno, enctype])
Returns an Authen::Krb5::KeytabEntry object representing an entry in the keytab
matching principal and optionally kvno and enctype.
o start_seq_get()
Returns a cursor that can be passed to next_entry() to read in turn every key in
the keytab.
o next_entry(cursor)
Returns the next entry in the keytab as an Authen::Krb5::KeytabEntry object.
o end_seq_get(cursor)
Perform cleanup opreations after next_entry() and invalidates cursor.
Authen::Krb5::KeytabEntry
o new(principal, kvno, keyblock)
Create a new Authen::Krb5::KeytabEntry object from an Authen::Krb5::Principal
object, a key version number, and an Authen::Krb5::Keyblock object.
o principal
An Authen::Krb5::Principal object representing the principal contained in the
entry.
o timestamp
The timestamp of the entry.
o kvno
The key version number of the key contained in the entry.
o key
An Authen::Krb5::Keyblock object representing a copy of the keyblock contained in
the entry.
Authen::Krb5::Creds
Object representing a credential.
o starttime()
Returns the starttime time property of the credential.
o authtime()
Returns the authtime time property of the credential.
o endtime()
Returns the endtime time property of the credential.
o renew_till()
Returns the renew_till time property of the credential.
o server()
Returns the name of the service principal the credential is for.
o client()
Returns the client principal name (will usually be identical for all credentials
in a credential cache).
o ticket()
Returns the Authen::Krb5::Ticket for this credential.
o keyblock()
Returns the keyblock of the credential.
AUTHOR
Jeff Horwitz (jeff@smashing.org)
ACKNOWLEDGEMENTS
Based on the original work by Doug MacEachern and Malcolm Beattie. Code contributions
from Scott Hutton (shutton@indiana.edu).
SEE ALSO
perl(1), kerberos(1).