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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/rcache/rc_dfl.c - default replay cache type */
/*
* Copyright (C) 2019 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/*
* The dfl rcache type is a wrapper around the file2 rcache type, selecting a
* filename and (on Unix-like systems) applying open() safety appropriate for
* using a shared temporary directory.
*/
#include "k5-int.h"
#include "rc-int.h"
#ifdef _WIN32
#include "../os/os-proto.h"
#else
#include <sys/types.h>
#include <sys/stat.h>
#endif
#ifdef _WIN32
static krb5_error_code
open_file(krb5_context context, int *fd_out)
{
krb5_error_code ret;
char *fname;
const char *dir;
*fd_out = -1;
dir = getenv("KRB5RCACHEDIR");
if (dir != NULL) {
if (asprintf(&fname, "%s\\krb5.rcache2") < 0)
return ENOMEM;
} else {
ret = k5_expand_path_tokens(context, "%{LOCAL_APPDATA}\\krb5.rcache2",
&fname);
if (ret)
return ret;
}
*fd_out = open(fname, O_CREAT | O_RDWR | O_BINARY, 0600);
ret = (*fd_out < 0) ? errno : 0;
if (ret) {
k5_setmsg(context, ret, "%s (filename: %s)",
error_message(ret), fname);
}
free(fname);
return ret;
}
#else /* _WIN32 */
static krb5_error_code
open_file(krb5_context context, int *fd_out)
{
krb5_error_code ret;
int fd = -1;
char *fname = NULL;
const char *dir;
struct stat statbuf;
uid_t euid = geteuid();
*fd_out = -1;
dir = secure_getenv("KRB5RCACHEDIR");
if (dir == NULL) {
dir = secure_getenv("TMPDIR");
if (dir == NULL)
dir = RCTMPDIR;
}
if (asprintf(&fname, "%s/krb5_%lu.rcache2", dir, (unsigned long)euid) < 0)
return ENOMEM;
fd = open(fname, O_CREAT | O_RDWR | O_NOFOLLOW, 0600);
if (fd < 0) {
ret = errno;
k5_setmsg(context, ret, "%s (filename: %s)",
error_message(ret), fname);
goto cleanup;
}
if (fstat(fd, &statbuf) < 0 || statbuf.st_uid != euid) {
ret = EIO;
k5_setmsg(context, ret, "Replay cache file %s is not owned by uid %lu",
fname, (unsigned long)euid);
goto cleanup;
}
*fd_out = fd;
fd = -1;
ret = 0;
cleanup:
if (fd != -1)
close(fd);
free(fname);
return ret;
}
#endif /* not _WIN32 */
static krb5_error_code
dfl_resolve(krb5_context context, const char *residual, void **rcdata_out)
{
*rcdata_out = NULL;
return 0;
}
static void
dfl_close(krb5_context context, void *rcdata)
{
}
static krb5_error_code
dfl_store(krb5_context context, void *rcdata, const krb5_data *tag)
{
krb5_error_code ret;
int fd;
ret = open_file(context, &fd);
if (ret)
return ret;
ret = k5_rcfile2_store(context, fd, tag);
close(fd);
return ret;
}
const krb5_rc_ops k5_rc_dfl_ops =
{
"dfl",
dfl_resolve,
dfl_close,
dfl_store
};
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