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(Including all changes for FreeBSD - importing the original eBones distribution would be too complex at this stage, since I don't have access to Piero's CVS.) (If you want to include eBones in your system, don't forget to include MAKE_EBONES in /etc/make.conf.) (This stuff is now also suppable from braae.ru.ac.za.) Bones originally from MIT SIPB. Original port to FreeBSD 1.x by Piero Serini. Moved to FreeBSD 2.0 by Doug Rabson and Geoff Rehmet. Nice bug fixes from Doug Rabson.
349 lines
7.4 KiB
Groff
349 lines
7.4 KiB
Groff
.\" from: krb_sendauth.3,v 4.1 89/01/23 11:10:58 jtkohl Exp $
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.\" $Id: krb_sendauth.3,v 1.2 1994/07/19 19:27:47 g89r4222 Exp $
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.\" Copyright 1988 by the Massachusetts Institute of Technology.
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.\"
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.\" For copying and distribution information,
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.\" please see the file <Copyright.MIT>.
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.\"
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.TH KRB_SENDAUTH 3 "Kerberos Version 4.0" "MIT Project Athena"
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.SH NAME
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krb_sendauth, krb_recvauth, krb_net_write, krb_net_read \-
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Kerberos routines for sending authentication via network stream sockets
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.SH SYNOPSIS
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.nf
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.nj
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.ft B
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#include <krb.h>
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#include <des.h>
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#include <netinet/in.h>
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.PP
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.fi
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.HP 1i
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.ft B
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int krb_sendauth(options, fd, ktext, service, inst, realm, checksum,
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msg_data, cred, schedule, laddr, faddr, version)
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.nf
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.RS 0
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.ft B
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long options;
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int fd;
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KTEXT ktext;
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char *service, *inst, *realm;
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u_long checksum;
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MSG_DAT *msg_data;
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CREDENTIALS *cred;
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Key_schedule schedule;
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struct sockaddr_in *laddr, *faddr;
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char *version;
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.PP
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.fi
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.HP 1i
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.ft B
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int krb_recvauth(options, fd, ktext, service, inst, faddr, laddr,
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auth_data, filename, schedule, version)
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.nf
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.RS 0
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.ft B
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long options;
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int fd;
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KTEXT ktext;
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char *service, *inst;
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struct sockaddr_in *faddr, *laddr;
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AUTH_DAT *auth_data;
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char *filename;
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Key_schedule schedule;
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char *version;
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.PP
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.ft B
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int krb_net_write(fd, buf, len)
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int fd;
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char *buf;
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int len;
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.PP
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.ft B
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int krb_net_read(fd, buf, len)
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int fd;
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char *buf;
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int len;
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.fi
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.SH DESCRIPTION
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.PP
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These functions,
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which are built on top of the core Kerberos library,
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provide a convenient means for client and server
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programs to send authentication messages
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to one another through network connections.
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The
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.I krb_sendauth
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function sends an authenticated ticket from the client program to
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the server program by writing the ticket to a network socket.
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The
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.I krb_recvauth
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function receives the ticket from the client by
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reading from a network socket.
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.SH KRB_SENDAUTH
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.PP
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This function writes the ticket to
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the network socket specified by the
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file descriptor
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.IR fd,
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returning KSUCCESS if the write proceeds successfully,
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and an error code if it does not.
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The
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.I ktext
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argument should point to an allocated KTEXT_ST structure.
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The
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.IR service,
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.IR inst,
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and
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.IR realm
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arguments specify the server program's Kerberos principal name,
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instance, and realm.
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If you are writing a client that uses the local realm exclusively,
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you can set the
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.I realm
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argument to NULL.
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The
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.I version
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argument allows the client program to pass an application-specific
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version string that the server program can then match against
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its own version string.
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The
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.I version
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string can be up to KSEND_VNO_LEN (see
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.IR <krb.h> )
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characters in length.
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The
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.I checksum
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argument can be used to pass checksum information to the
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server program.
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The client program is responsible for specifying this information.
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This checksum information is difficult to corrupt because
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.I krb_sendauth
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passes it over the network in encrypted form.
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The
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.I checksum
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argument is passed as the checksum argument to
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.IR krb_mk_req .
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You can set
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.IR krb_sendauth's
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other arguments to NULL unless you want the
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client and server programs to mutually authenticate
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themselves.
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In the case of mutual authentication,
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the client authenticates itself to the server program,
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and demands that the server in turn authenticate itself to
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the client.
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.SH KRB_SENDAUTH AND MUTUAL AUTHENTICATION
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.PP
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If you want mutual authentication,
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make sure that you read all pending data from the local socket
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before calling
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.IR krb_sendauth.
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Set
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.IR krb_sendauth's
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.I options
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argument to
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.BR KOPT_DO_MUTUAL
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(this macro is defined in the
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.IR krb.h
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file);
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make sure that the
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.I laddr
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argument points to
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the address of the local socket,
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and that
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.I faddr
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points to the foreign socket's network address.
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.I Krb_sendauth
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fills in the other arguments--
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.IR msg_data ,
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.IR cred ,
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and
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.IR schedule --before
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sending the ticket to the server program.
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You must, however, allocate space for these arguments
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before calling the function.
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.I Krb_sendauth
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supports two other options:
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.BR KOPT_DONT_MK_REQ,
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and
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.BR KOPT_DONT_CANON.
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If called with
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.I options
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set as KOPT_DONT_MK_REQ,
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.I krb_sendauth
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will not use the
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.I krb_mk_req
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function to retrieve the ticket from the Kerberos server.
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The
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.I ktext
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argument must point to an existing ticket and authenticator (such as
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would be created by
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.IR krb_mk_req ),
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and the
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.IR service,
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.IR inst,
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and
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.IR realm
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arguments can be set to NULL.
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If called with
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.I options
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set as KOPT_DONT_CANON,
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.I krb_sendauth
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will not convert the service's instance to canonical form using
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.IR krb_get_phost (3).
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If you want to call
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.I krb_sendauth
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with a multiple
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.I options
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specification,
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construct
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.I options
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as a bitwise-OR of the options you want to specify.
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.SH KRB_RECVAUTH
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.PP
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The
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.I krb_recvauth
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function
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reads a ticket/authenticator pair from the socket pointed to by the
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.I fd
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argument.
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Set the
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.I options
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argument
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as a bitwise-OR of the options desired.
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Currently only KOPT_DO_MUTUAL is useful to the receiver.
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The
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.I ktext
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argument
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should point to an allocated KTEXT_ST structure.
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.I Krb_recvauth
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fills
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.I ktext
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with the
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ticket/authenticator pair read from
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.IR fd ,
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then passes it to
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.IR krb_rd_req .
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The
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.I service
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and
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.I inst
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arguments
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specify the expected service and instance for which the ticket was
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generated. They are also passed to
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.IR krb_rd_req.
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The
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.I inst
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argument may be set to "*" if the caller wishes
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.I krb_mk_req
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to fill in the instance used (note that there must be space in the
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.I inst
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argument to hold a full instance name, see
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.IR krb_mk_req (3)).
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The
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.I faddr
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argument
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should point to the address of the peer which is presenting the ticket.
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It is also passed to
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.IR krb_rd_req .
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If the client and server plan to mutually authenticate
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one another,
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the
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.I laddr
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argument
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should point to the local address of the file descriptor.
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Otherwise you can set this argument to NULL.
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The
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.I auth_data
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argument
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should point to an allocated AUTH_DAT area.
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It is passed to and filled in by
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.IR krb_rd_req .
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The checksum passed to the corresponding
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.I krb_sendauth
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is available as part of the filled-in AUTH_DAT area.
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The
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.I filename
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argument
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specifies the filename
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which the service program should use to obtain its service key.
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.I Krb_recvauth
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passes
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.I filename
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to the
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.I krb_rd_req
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function.
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If you set this argument to "",
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.I krb_rd_req
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looks for the service key in the file
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.IR /etc/srvtab.
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If the client and server are performing mutual authenication,
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the
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.I schedule
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argument
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should point to an allocated Key_schedule.
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Otherwise it is ignored and may be NULL.
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The
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.I version
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argument should point to a character array of at least KSEND_VNO_LEN
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characters. It is filled in with the version string passed by the client to
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.IR krb_sendauth.
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.PP
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.SH KRB_NET_WRITE AND KRB_NET_READ
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.PP
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The
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.I krb_net_write
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function
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emulates the write(2) system call, but guarantees that all data
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specified is written to
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.I fd
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before returning, unless an error condition occurs.
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.PP
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The
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.I krb_net_read
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function
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emulates the read(2) system call, but guarantees that the requested
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amount of data is read from
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.I fd
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before returning, unless an error condition occurs.
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.PP
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.SH BUGS
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.IR krb_sendauth,
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.IR krb_recvauth,
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.IR krb_net_write,
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and
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.IR krb_net_read
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will not work properly on sockets set to non-blocking I/O mode.
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.SH SEE ALSO
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krb_mk_req(3), krb_rd_req(3), krb_get_phost(3)
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.SH AUTHOR
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John T. Kohl, MIT Project Athena
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.SH RESTRICTIONS
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Copyright 1988, Massachusetts Instititute of Technology.
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For copying and distribution information,
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please see the file <mit-copyright.h>.
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