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/*
* lib/krb5/ccache/file/fcc_maybe.c
*
* Copyright 1990, 1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* This file contains the source code for conditional open/close calls.
*/
#define NEED_SOCKETS /* Only for ntohs, etc. */
#define NEED_LOWLEVEL_IO
#include "k5-int.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "fcc.h"
#ifdef HAVE_NETINET_IN_H
#if !defined(_WINSOCKAPI_) && !defined(HAVE_MACSOCK_H)
#include <netinet/in.h>
#endif
#else
#error find some way to use net-byte-order file version numbers.
#endif
krb5_error_code
krb5_fcc_close_file (context, id)
krb5_context context;
krb5_ccache id;
{
int ret;
krb5_fcc_data *data = (krb5_fcc_data *)id->data;
krb5_error_code retval;
if (data->fd == -1)
return KRB5_FCC_INTERNAL;
retval = krb5_unlock_file(context, data->fd);
ret = close (data->fd);
data->fd = -1;
if (retval)
return retval;
else
return (ret == -1) ? krb5_fcc_interpret (context, errno) : 0;
}
krb5_error_code
krb5_fcc_open_file (context, id, mode)
krb5_context context;
krb5_ccache id;
int mode;
{
krb5_os_context os_ctx = (krb5_os_context)context->os_context;
krb5_fcc_data *data = (krb5_fcc_data *)id->data;
krb5_ui_2 fcc_fvno;
krb5_ui_2 fcc_flen;
krb5_ui_2 fcc_tag;
krb5_ui_2 fcc_taglen;
int fd;
int open_flag, lock_flag;
krb5_error_code retval = 0;
if (data->fd != -1) {
/* Don't know what state it's in; shut down and start anew. */
(void) krb5_unlock_file(context, data->fd);
(void) close (data->fd);
data->fd = -1;
}
data->mode = mode;
switch(mode) {
case FCC_OPEN_AND_ERASE:
unlink(data->filename);
open_flag = O_CREAT|O_EXCL|O_TRUNC|O_RDWR;
break;
case FCC_OPEN_RDWR:
open_flag = O_RDWR;
break;
case FCC_OPEN_RDONLY:
default:
open_flag = O_RDONLY;
break;
}
fd = THREEPARAMOPEN (data->filename, open_flag | O_BINARY, 0600);
if (fd == -1)
return krb5_fcc_interpret (context, errno);
if (data->mode == FCC_OPEN_RDONLY)
lock_flag = KRB5_LOCKMODE_SHARED;
else
lock_flag = KRB5_LOCKMODE_EXCLUSIVE;
if ((retval = krb5_lock_file(context, fd, lock_flag))) {
(void) close(fd);
return retval;
}
if (mode == FCC_OPEN_AND_ERASE) {
/* write the version number */
int cnt;
fcc_fvno = htons(context->fcc_default_format);
data->version = context->fcc_default_format;
if ((cnt = write(fd, (char *)&fcc_fvno, sizeof(fcc_fvno))) !=
sizeof(fcc_fvno)) {
retval = ((cnt == -1) ? krb5_fcc_interpret(context, errno) :
KRB5_CC_IO);
goto done;
}
data->fd = fd;
if (data->version == KRB5_FCC_FVNO_4) {
/* V4 of the credentials cache format allows for header tags */
fcc_flen = 0;
if (os_ctx->os_flags & KRB5_OS_TOFFSET_VALID)
fcc_flen += (2*sizeof(krb5_ui_2) + 2*sizeof(krb5_int32));
/* Write header length */
retval = krb5_fcc_store_ui_2(context, id, (krb5_int32)fcc_flen);
if (retval) goto done;
if (os_ctx->os_flags & KRB5_OS_TOFFSET_VALID) {
/* Write time offset tag */
fcc_tag = FCC_TAG_DELTATIME;
fcc_taglen = 2*sizeof(krb5_int32);
retval = krb5_fcc_store_ui_2(context,id,(krb5_int32)fcc_tag);
if (retval) goto done;
retval = krb5_fcc_store_ui_2(context,id,(krb5_int32)fcc_taglen);
if (retval) goto done;
retval = krb5_fcc_store_int32(context,id,os_ctx->time_offset);
if (retval) goto done;
retval = krb5_fcc_store_int32(context,id,os_ctx->usec_offset);
if (retval) goto done;
}
}
goto done;
}
/* verify a valid version number is there */
if (read(fd, (char *)&fcc_fvno, sizeof(fcc_fvno)) !=
sizeof(fcc_fvno)) {
retval = KRB5_CC_FORMAT;
goto done;
}
if ((fcc_fvno != htons(KRB5_FCC_FVNO_4)) &&
(fcc_fvno != htons(KRB5_FCC_FVNO_3)) &&
(fcc_fvno != htons(KRB5_FCC_FVNO_2)) &&
(fcc_fvno != htons(KRB5_FCC_FVNO_1)))
{
retval = KRB5_CCACHE_BADVNO;
goto done;
}
data->version = ntohs(fcc_fvno);
data->fd = fd;
if (data->version == KRB5_FCC_FVNO_4) {
char buf[1024];
if (krb5_fcc_read_ui_2(context, id, &fcc_flen) ||
(fcc_flen > sizeof(buf)))
{
retval = KRB5_CC_FORMAT;
goto done;
}
while (fcc_flen) {
if ((fcc_flen < (2 * sizeof(krb5_ui_2))) ||
krb5_fcc_read_ui_2(context, id, &fcc_tag) ||
krb5_fcc_read_ui_2(context, id, &fcc_taglen) ||
(fcc_taglen > (fcc_flen - 2*sizeof(krb5_ui_2))))
{
retval = KRB5_CC_FORMAT;
goto done;
}
switch (fcc_tag) {
case FCC_TAG_DELTATIME:
if (fcc_taglen != 2*sizeof(krb5_int32)) {
retval = KRB5_CC_FORMAT;
goto done;
}
if (!(context->library_options & KRB5_LIBOPT_SYNC_KDCTIME) ||
(os_ctx->os_flags & KRB5_OS_TOFFSET_VALID))
{
if (krb5_fcc_read(context, id, buf, fcc_taglen)) {
retval = KRB5_CC_FORMAT;
goto done;
}
break;
}
if (krb5_fcc_read_int32(context, id, &os_ctx->time_offset) ||
krb5_fcc_read_int32(context, id, &os_ctx->usec_offset))
{
retval = KRB5_CC_FORMAT;
goto done;
}
os_ctx->os_flags =
((os_ctx->os_flags & ~KRB5_OS_TOFFSET_TIME) |
KRB5_OS_TOFFSET_VALID);
break;
default:
if (fcc_taglen && krb5_fcc_read(context,id,buf,fcc_taglen)) {
retval = KRB5_CC_FORMAT;
goto done;
}
break;
}
fcc_flen -= (2*sizeof(krb5_ui_2) + fcc_taglen);
}
}
done:
if (retval) {
data->fd = -1;
(void) krb5_unlock_file(context, fd);
(void) close(fd);
}
return retval;
}
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