freebsd-dev/crypto/kerberosIV/appl/ftp/ftpd/auth.c
Mark Murray 03656ac1b0 Initial import of KTH eBones. This has been cleaned up to only include
the "core" Kerberos functionality. The rest of the userland will get their
own changes later.
1997-09-04 06:04:33 +00:00

250 lines
5.5 KiB
C

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