03656ac1b0
the "core" Kerberos functionality. The rest of the userland will get their own changes later.
250 lines
5.5 KiB
C
250 lines
5.5 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: auth.c,v 1.11 1997/05/04 23:09:00 assar Exp $");
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#if defined(HAVE_SYS_IOCTL_H) && SunOS != 4
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#include <sys/ioctl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "extern.h"
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#include "krb4.h"
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#include "auth.h"
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static struct at auth_types [] = {
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{ "KERBEROS_V4", krb4_auth, krb4_adat, krb4_pbsz, krb4_prot, krb4_ccc,
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krb4_mic, krb4_conf, krb4_enc, krb4_read, krb4_write, krb4_userok,
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krb4_vprintf },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }
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};
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struct at *ct;
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int data_protection;
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int buffer_size;
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unsigned char *data_buffer;
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int auth_complete;
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char *protection_names[] = {
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"clear", "safe",
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"confidential", "private"
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};
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void auth_init(void)
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{
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}
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char *ftp_command;
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int prot_level;
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void new_ftp_command(char *command)
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{
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ftp_command = command;
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}
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void delete_ftp_command(void)
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{
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if(ftp_command){
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free(ftp_command);
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ftp_command = NULL;
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}
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}
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int auth_ok(void)
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{
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return ct && auth_complete;
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}
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void auth(char *auth)
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{
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for(ct=auth_types; ct->name; ct++){
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if(!strcasecmp(auth, ct->name)){
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ct->auth(auth);
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return;
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}
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}
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reply(504, "%s is not a known security mechanism", auth);
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}
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void adat(char *auth)
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{
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if(ct && !auth_complete)
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ct->adat(auth);
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else
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reply(503, "You must (re)issue an AUTH first.");
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}
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void pbsz(int size)
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{
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int old = buffer_size;
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if(auth_ok())
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ct->pbsz(size);
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else
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reply(503, "Incomplete security data exchange.");
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if(buffer_size != old){
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if(data_buffer)
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free(data_buffer);
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data_buffer = malloc(buffer_size + 4);
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}
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}
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void prot(char *pl)
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{
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int p = -1;
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if(buffer_size == 0){
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reply(503, "No protection buffer size negotiated.");
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return;
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}
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if(!strcasecmp(pl, "C"))
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p = prot_clear;
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if(!strcasecmp(pl, "S"))
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p = prot_safe;
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if(!strcasecmp(pl, "E"))
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p = prot_confidential;
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if(!strcasecmp(pl, "P"))
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p = prot_private;
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if(p == -1){
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reply(504, "Unrecognized protection level.");
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return;
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}
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if(auth_ok()){
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if(ct->prot(p)){
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reply(536, "%s does not support %s protection.",
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ct->name, protection_names[p]);
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}else{
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data_protection = p;
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reply(200, "Data protection is %s.",
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protection_names[data_protection]);
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}
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}else{
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reply(503, "Incomplete security data exchange.");
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}
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}
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void ccc(void)
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{
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if(auth_ok()){
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if(!ct->ccc())
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prot_level = prot_clear;
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}else
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reply(503, "Incomplete security data exchange.");
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}
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void mic(char *msg)
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{
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if(auth_ok()){
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if(!ct->mic(msg))
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prot_level = prot_safe;
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}else
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reply(503, "Incomplete security data exchange.");
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}
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void conf(char *msg)
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{
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if(auth_ok()){
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if(!ct->conf(msg))
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prot_level = prot_confidential;
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}else
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reply(503, "Incomplete security data exchange.");
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}
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void enc(char *msg)
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{
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if(auth_ok()){
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if(!ct->enc(msg))
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prot_level = prot_private;
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}else
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reply(503, "Incomplete security data exchange.");
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}
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int auth_read(int fd, void *data, int length)
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{
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if(auth_ok() && data_protection)
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return ct->read(fd, data, length);
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else
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return read(fd, data, length);
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}
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int auth_write(int fd, void *data, int length)
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{
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if(auth_ok() && data_protection)
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return ct->write(fd, data, length);
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else
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return write(fd, data, length);
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}
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void auth_vprintf(const char *fmt, va_list ap)
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{
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if(auth_ok() && prot_level){
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ct->vprintf(fmt, ap);
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}else
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vprintf(fmt, ap);
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}
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void auth_printf(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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auth_vprintf(fmt, ap);
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va_end(ap);
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}
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