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KRB_SENDAUTH(3)						       KRB_SENDAUTH(3)

NAME
       krb_sendauth, krb_recvauth, krb_net_write, krb_net_read - Kerberos rou‐
       tines for sending authentication via network stream sockets

SYNOPSIS
       #include <kerberosIV/krb.h>
       #include <kerberosIV/des.h>
       #include <netinet/in.h>

       int krb_sendauth(options, fd, ktext, service,  inst,  realm,  checksum,
		 msg_data, cred, schedule, laddr, faddr, version)
       long options;
       int fd;
       KTEXT ktext;
       char *service, *inst, *realm;
       u_long checksum;
       MSG_DAT *msg_data;
       CREDENTIALS *cred;
       Key_schedule schedule;
       struct sockaddr_in *laddr, *faddr;
       char *version;

       int  krb_recvauth(options,  fd,	ktext,	service,  inst,	 faddr, laddr,
		 auth_data, filename, schedule, version)
       long options;
       int fd;
       KTEXT ktext;
       char *service, *inst;
       struct sockaddr_in *faddr, *laddr;
       AUTH_DAT *auth_data;
       char *filename;
       Key_schedule schedule;
       char *version;

       int krb_net_write(fd, buf, len)
       int fd;
       char *buf;
       int len;

       int krb_net_read(fd, buf, len)
       int fd;
       char *buf;
       int len;

DESCRIPTION
       These functions, which are built on top of the core  Kerberos  library,
       provide	a  convenient  means  for  client  and server programs to send
       authentication messages to one  another	through	 network  connections.
       The krb_sendauth function sends an authenticated ticket from the client
       program to the server program  by  writing  the	ticket	to  a  network
       socket.	 The krb_recvauth function receives the ticket from the client
       by reading from a network socket.

KRB_SENDAUTH
       This function writes the ticket to the network socket specified by  the
       file  descriptor	 fd, returning KSUCCESS if the write proceeds success‐
       fully, and an error code if it does not.

       The ktext argument should point to  an  allocated  KTEXT_ST  structure.
       The  service,  inst,  and  realm arguments specify the server program's
       Kerberos principal name, instance, and realm.  If  you  are  writing  a
       client  that  uses  the	local realm exclusively, you can set the realm
       argument to NULL.

       The version argument allows the client program to pass an  application-
       specific	 version string that the server program can then match against
       its own version string.	The version string can be up to	 KSEND_VNO_LEN
       (see <krb.h>) characters in length.

       The  checksum  argument can be used to pass checksum information to the
       server program.	The client program is responsible for specifying  this
       information.  This checksum information is difficult to corrupt because
       krb_sendauth passes it over the network in encrypted form.  The	check‐
       sum argument is passed as the checksum argument to krb_mk_req.

       You  can set krb_sendauth's other arguments to NULL unless you want the
       client and server programs to mutually authenticate themselves.	In the
       case  of	 mutual authentication, the client authenticates itself to the
       server program, and demands that the server in turn authenticate itself
       to the client.

KRB_SENDAUTH AND MUTUAL AUTHENTICATION
       If  you want mutual authentication, make sure that you read all pending
       data  from  the	local  socket  before	calling	  krb_sendauth.	   Set
       krb_sendauth's  options	argument  to  KOPT_DO_MUTUAL  (this  macro  is
       defined in the krb.h file); make sure that the laddr argument points to
       the  address  of the local socket, and that faddr points to the foreign
       socket's network address.

       Krb_sendauth fills in the other arguments-- msg_data, cred, and	sched‐
       ule--before  sending  the ticket to the server program.	You must, how‐
       ever, allocate space for these arguments before calling the function.

       Krb_sendauth  supports  two  other   options:   KOPT_DONT_MK_REQ,   and
       KOPT_DONT_CANON.	  If  called  with  options  set  as KOPT_DONT_MK_REQ,
       krb_sendauth will not use  the  krb_mk_req  function  to	 retrieve  the
       ticket  from  the Kerberos server.  The ktext argument must point to an
       existing	 ticket	 and  authenticator  (such  as	would  be  created  by
       krb_mk_req),  and  the service, inst, and realm arguments can be set to
       NULL.

       If called with options set as KOPT_DONT_CANON,  krb_sendauth  will  not
       convert	  the	 service's    instance	 to   canonical	  form	 using
       krb_get_phost(3).

       If you want to call krb_sendauth with a multiple options specification,
       construct options as a bitwise-OR of the options you want to specify.

KRB_RECVAUTH
       The  krb_recvauth  function  reads a ticket/authenticator pair from the
       socket pointed to by the fd argument.  Set the options  argument	 as  a
       bitwise-OR  of  the  options desired.  Currently only KOPT_DO_MUTUAL is
       useful to the receiver.

       The ktext argument should point to  an  allocated  KTEXT_ST  structure.
       Krb_recvauth  fills  ktext with the ticket/authenticator pair read from
       fd, then passes it to krb_rd_req.

       The service  and	 inst  arguments  specify  the	expected  service  and
       instance	 for  which the ticket was generated.  They are also passed to
       krb_rd_req.  The inst argument may be set to "*" if the	caller	wishes
       krb_mk_req  to fill in the instance used (note that there must be space
       in the inst argument to hold a full instance name, see krb_mk_req(3)).

       The faddr argument should point to the address of  the  peer  which  is
       presenting the ticket.  It is also passed to krb_rd_req.

       If the client and server plan to mutually authenticate one another, the
       laddr argument should point to the local address of the	file  descrip‐
       tor.  Otherwise you can set this argument to NULL.

       The  auth_data argument should point to an allocated AUTH_DAT area.  It
       is passed to and filled in by krb_rd_req.  The checksum passed  to  the
       corresponding  krb_sendauth  is	available  as  part  of	 the filled-in
       AUTH_DAT area.

       The filename argument specifies the filename which the service  program
       should  use to obtain its service key.  Krb_recvauth passes filename to
       the krb_rd_req function.	 If you set this argument  to  "",  krb_rd_req
       looks for the service key in the file /etc/kerberosIV/srvtab.

       If  the	client	and  server  are performing mutual authentication, the
       schedule argument should point to an allocated Key_schedule.  Otherwise
       it is ignored and may be NULL.

       The  version  argument  should  point  to a character array of at least
       KSEND_VNO_LEN characters.  It is filled	in  with  the  version	string
       passed by the client to krb_sendauth.

KRB_NET_WRITE AND KRB_NET_READ
       The krb_net_write function emulates the write(2) system call, but guar‐
       antees that all data specified  is  written  to	fd  before  returning,
       unless an error condition occurs.

       The krb_net_read function emulates the read(2) system call, but guaran‐
       tees that the requested amount of data is read from fd  before  return‐
       ing, unless an error condition occurs.

BUGS
       krb_sendauth,  krb_recvauth,  krb_net_write,  and krb_net_read will not
       work properly on sockets set to non-blocking I/O mode.

SEE ALSO
       krb_mk_req(3), krb_rd_req(3), krb_get_phost(3)

AUTHOR
       John T. Kohl, MIT Project Athena

RESTRICTIONS
       Copyright 1988, Massachusetts Instititute of Technology.	  For  copying
       and distribution information, please see the file <mit-copyright.h>.

MIT Project Athena	     Kerberos Version 4.0	       KRB_SENDAUTH(3)
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