657 lines
14 KiB
C
657 lines
14 KiB
C
/*
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* Copyright (c) 1997 - 2004 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. 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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#include "krb5_locl.h"
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RCSID("$Id: fcache.c,v 1.34.6.6 2004/03/10 13:30:59 lha Exp $");
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typedef struct krb5_fcache{
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char *filename;
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int version;
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}krb5_fcache;
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struct fcc_cursor {
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int fd;
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krb5_storage *sp;
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};
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#define KRB5_FCC_FVNO_1 1
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#define KRB5_FCC_FVNO_2 2
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#define KRB5_FCC_FVNO_3 3
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#define KRB5_FCC_FVNO_4 4
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#define FCC_TAG_DELTATIME 1
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#define FCACHE(X) ((krb5_fcache*)(X)->data.data)
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#define FILENAME(X) (FCACHE(X)->filename)
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#define FCC_CURSOR(C) ((struct fcc_cursor*)(C))
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static const char*
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fcc_get_name(krb5_context context,
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krb5_ccache id)
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{
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return FILENAME(id);
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}
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int
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_krb5_xlock(krb5_context context, int fd, krb5_boolean exclusive,
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const char *filename)
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{
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int ret;
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#ifdef HAVE_FCNTL
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struct flock l;
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l.l_start = 0;
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l.l_len = 0;
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l.l_type = exclusive ? F_WRLCK : F_RDLCK;
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l.l_whence = SEEK_SET;
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ret = fcntl(fd, F_SETLKW, &l);
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#else
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ret = flock(fd, exclusive ? LOCK_EX : LOCK_SH);
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#endif
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if(ret < 0)
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ret = errno;
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if(ret == EACCES) /* fcntl can return EACCES instead of EAGAIN */
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ret = EAGAIN;
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switch (ret) {
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case 0:
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break;
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case EINVAL: /* filesystem doesn't support locking, let the user have it */
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ret = 0;
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break;
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case EAGAIN:
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krb5_set_error_string(context, "timed out locking cache file %s",
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filename);
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break;
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default:
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krb5_set_error_string(context, "error locking cache file %s: %s",
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filename, strerror(ret));
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break;
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}
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return ret;
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}
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int
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_krb5_xunlock(int fd)
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{
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#ifdef HAVE_FCNTL_LOCK
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struct flock l;
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l.l_start = 0;
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l.l_len = 0;
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l.l_type = F_UNLCK;
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l.l_whence = SEEK_SET;
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return fcntl(fd, F_SETLKW, &l);
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#else
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return flock(fd, LOCK_UN);
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#endif
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}
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static krb5_error_code
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fcc_lock(krb5_context context, krb5_ccache id,
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int fd, krb5_boolean exclusive)
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{
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return _krb5_xlock(context, fd, exclusive, fcc_get_name(context, id));
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}
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static krb5_error_code
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fcc_unlock(krb5_context context, int fd)
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{
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return _krb5_xunlock(fd);
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}
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static krb5_error_code
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fcc_resolve(krb5_context context, krb5_ccache *id, const char *res)
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{
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krb5_fcache *f;
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f = malloc(sizeof(*f));
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if(f == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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return KRB5_CC_NOMEM;
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}
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f->filename = strdup(res);
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if(f->filename == NULL){
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free(f);
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krb5_set_error_string(context, "malloc: out of memory");
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return KRB5_CC_NOMEM;
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}
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f->version = 0;
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(*id)->data.data = f;
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(*id)->data.length = sizeof(*f);
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return 0;
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}
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/*
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* Try to scrub the contents of `filename' safely.
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*/
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static int
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scrub_file (int fd)
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{
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off_t pos;
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char buf[128];
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pos = lseek(fd, 0, SEEK_END);
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if (pos < 0)
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return errno;
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if (lseek(fd, 0, SEEK_SET) < 0)
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return errno;
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memset(buf, 0, sizeof(buf));
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while(pos > 0) {
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ssize_t tmp = write(fd, buf, min(sizeof(buf), pos));
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if (tmp < 0)
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return errno;
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pos -= tmp;
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}
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fsync (fd);
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return 0;
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}
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/*
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* Erase `filename' if it exists, trying to remove the contents if
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* it's `safe'. We always try to remove the file, it it exists. It's
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* only overwritten if it's a regular file (not a symlink and not a
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* hardlink)
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*/
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static krb5_error_code
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erase_file(const char *filename)
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{
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int fd;
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struct stat sb1, sb2;
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int ret;
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ret = lstat (filename, &sb1);
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if (ret < 0)
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return errno;
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fd = open(filename, O_RDWR | O_BINARY);
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if(fd < 0) {
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if(errno == ENOENT)
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return 0;
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else
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return errno;
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}
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if (unlink(filename) < 0) {
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close (fd);
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return errno;
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}
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ret = fstat (fd, &sb2);
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if (ret < 0) {
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close (fd);
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return errno;
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}
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/* check if someone was playing with symlinks */
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if (sb1.st_dev != sb2.st_dev || sb1.st_ino != sb2.st_ino) {
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close (fd);
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return EPERM;
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}
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/* there are still hard links to this file */
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if (sb2.st_nlink != 0) {
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close (fd);
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return 0;
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}
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ret = scrub_file (fd);
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close (fd);
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return ret;
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}
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static krb5_error_code
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fcc_gen_new(krb5_context context, krb5_ccache *id)
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{
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krb5_fcache *f;
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int fd;
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char *file;
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f = malloc(sizeof(*f));
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if(f == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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return KRB5_CC_NOMEM;
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}
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asprintf (&file, "%sXXXXXX", KRB5_DEFAULT_CCFILE_ROOT);
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if(file == NULL) {
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free(f);
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krb5_set_error_string(context, "malloc: out of memory");
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return KRB5_CC_NOMEM;
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}
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fd = mkstemp(file);
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if(fd < 0) {
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free(f);
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free(file);
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krb5_set_error_string(context, "mkstemp %s", file);
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return errno;
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}
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close(fd);
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f->filename = file;
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f->version = 0;
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(*id)->data.data = f;
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(*id)->data.length = sizeof(*f);
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return 0;
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}
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static void
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storage_set_flags(krb5_context context, krb5_storage *sp, int vno)
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{
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int flags = 0;
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switch(vno) {
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case KRB5_FCC_FVNO_1:
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flags |= KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS;
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flags |= KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE;
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flags |= KRB5_STORAGE_HOST_BYTEORDER;
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break;
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case KRB5_FCC_FVNO_2:
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flags |= KRB5_STORAGE_HOST_BYTEORDER;
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break;
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case KRB5_FCC_FVNO_3:
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flags |= KRB5_STORAGE_KEYBLOCK_KEYTYPE_TWICE;
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break;
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case KRB5_FCC_FVNO_4:
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break;
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default:
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krb5_abortx(context,
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"storage_set_flags called with bad vno (%x)", vno);
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}
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krb5_storage_set_flags(sp, flags);
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}
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static krb5_error_code
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fcc_open(krb5_context context,
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krb5_ccache id,
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int *fd_ret,
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int flags,
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mode_t mode)
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{
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krb5_boolean exclusive = ((flags | O_WRONLY) == flags ||
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(flags | O_RDWR) == flags);
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krb5_error_code ret;
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const char *filename = FILENAME(id);
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int fd;
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fd = open(filename, flags, mode);
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if(fd < 0) {
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ret = errno;
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krb5_set_error_string(context, "open(%s): %s", filename,
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strerror(ret));
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return ret;
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}
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if((ret = fcc_lock(context, id, fd, exclusive)) != 0) {
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close(fd);
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return ret;
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}
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*fd_ret = fd;
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return 0;
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}
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static krb5_error_code
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fcc_initialize(krb5_context context,
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krb5_ccache id,
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krb5_principal primary_principal)
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{
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krb5_fcache *f = FCACHE(id);
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int ret = 0;
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int fd;
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char *filename = f->filename;
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unlink (filename);
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ret = fcc_open(context, id, &fd, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600);
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if(ret)
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return ret;
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{
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krb5_storage *sp;
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sp = krb5_storage_from_fd(fd);
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krb5_storage_set_eof_code(sp, KRB5_CC_END);
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if(context->fcache_vno != 0)
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f->version = context->fcache_vno;
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else
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f->version = KRB5_FCC_FVNO_4;
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ret |= krb5_store_int8(sp, 5);
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ret |= krb5_store_int8(sp, f->version);
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storage_set_flags(context, sp, f->version);
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if(f->version == KRB5_FCC_FVNO_4 && ret == 0) {
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/* V4 stuff */
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if (context->kdc_sec_offset) {
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ret |= krb5_store_int16 (sp, 12); /* length */
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ret |= krb5_store_int16 (sp, FCC_TAG_DELTATIME); /* Tag */
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ret |= krb5_store_int16 (sp, 8); /* length of data */
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ret |= krb5_store_int32 (sp, context->kdc_sec_offset);
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ret |= krb5_store_int32 (sp, context->kdc_usec_offset);
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} else {
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ret |= krb5_store_int16 (sp, 0);
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}
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}
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ret |= krb5_store_principal(sp, primary_principal);
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krb5_storage_free(sp);
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}
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fcc_unlock(context, fd);
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if (close(fd) < 0)
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if (ret == 0) {
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ret = errno;
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krb5_set_error_string (context, "close %s: %s",
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FILENAME(id), strerror(ret));
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}
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return ret;
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}
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static krb5_error_code
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fcc_close(krb5_context context,
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krb5_ccache id)
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{
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free (FILENAME(id));
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krb5_data_free(&id->data);
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return 0;
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}
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static krb5_error_code
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fcc_destroy(krb5_context context,
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krb5_ccache id)
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{
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erase_file(FILENAME(id));
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return 0;
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}
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static krb5_error_code
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fcc_store_cred(krb5_context context,
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krb5_ccache id,
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krb5_creds *creds)
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{
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int ret;
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int fd;
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ret = fcc_open(context, id, &fd, O_WRONLY | O_APPEND | O_BINARY, 0);
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if(ret)
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return ret;
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{
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krb5_storage *sp;
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sp = krb5_storage_from_fd(fd);
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krb5_storage_set_eof_code(sp, KRB5_CC_END);
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storage_set_flags(context, sp, FCACHE(id)->version);
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if (krb5_config_get_bool_default(context, NULL, FALSE,
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"libdefaults",
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"fcc-mit-ticketflags",
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NULL))
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ret = _krb5_store_creds_heimdal_0_7(sp, creds);
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else
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ret = _krb5_store_creds_heimdal_pre_0_7(sp, creds);
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krb5_storage_free(sp);
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}
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fcc_unlock(context, fd);
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if (close(fd) < 0)
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if (ret == 0) {
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ret = errno;
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krb5_set_error_string (context, "close %s: %s",
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FILENAME(id), strerror(ret));
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}
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return ret;
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}
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static krb5_error_code
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init_fcc (krb5_context context,
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krb5_ccache id,
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krb5_storage **ret_sp,
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int *ret_fd)
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{
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int fd;
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int8_t pvno, tag;
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krb5_storage *sp;
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krb5_error_code ret;
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ret = fcc_open(context, id, &fd, O_RDONLY | O_BINARY, 0);
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if(ret)
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return ret;
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sp = krb5_storage_from_fd(fd);
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if(sp == NULL) {
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ret = ENOMEM;
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goto out;
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}
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krb5_storage_set_eof_code(sp, KRB5_CC_END);
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ret = krb5_ret_int8(sp, &pvno);
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if(ret != 0) {
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if(ret == KRB5_CC_END)
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ret = ENOENT; /* empty file */
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goto out;
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}
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if(pvno != 5) {
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ret = KRB5_CCACHE_BADVNO;
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goto out;
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}
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ret = krb5_ret_int8(sp, &tag); /* should not be host byte order */
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if(ret != 0) {
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ret = KRB5_CC_FORMAT;
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goto out;
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}
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FCACHE(id)->version = tag;
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storage_set_flags(context, sp, FCACHE(id)->version);
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switch (tag) {
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case KRB5_FCC_FVNO_4: {
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int16_t length;
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ret = krb5_ret_int16 (sp, &length);
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if(ret) {
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ret = KRB5_CC_FORMAT;
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goto out;
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}
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while(length > 0) {
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int16_t tag, data_len;
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int i;
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int8_t dummy;
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ret = krb5_ret_int16 (sp, &tag);
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if(ret) {
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ret = KRB5_CC_FORMAT;
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goto out;
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}
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ret = krb5_ret_int16 (sp, &data_len);
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if(ret) {
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ret = KRB5_CC_FORMAT;
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goto out;
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}
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switch (tag) {
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case FCC_TAG_DELTATIME :
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ret = krb5_ret_int32 (sp, &context->kdc_sec_offset);
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if(ret) {
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ret = KRB5_CC_FORMAT;
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goto out;
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}
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ret = krb5_ret_int32 (sp, &context->kdc_usec_offset);
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if(ret) {
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ret = KRB5_CC_FORMAT;
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goto out;
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}
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break;
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default :
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for (i = 0; i < data_len; ++i) {
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ret = krb5_ret_int8 (sp, &dummy);
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if(ret) {
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ret = KRB5_CC_FORMAT;
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goto out;
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}
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}
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break;
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}
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length -= 4 + data_len;
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}
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break;
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}
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case KRB5_FCC_FVNO_3:
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case KRB5_FCC_FVNO_2:
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case KRB5_FCC_FVNO_1:
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break;
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default :
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ret = KRB5_CCACHE_BADVNO;
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goto out;
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}
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*ret_sp = sp;
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*ret_fd = fd;
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return 0;
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out:
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if(sp != NULL)
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krb5_storage_free(sp);
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fcc_unlock(context, fd);
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close(fd);
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|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
fcc_get_principal(krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_principal *principal)
|
|
{
|
|
krb5_error_code ret;
|
|
int fd;
|
|
krb5_storage *sp;
|
|
|
|
ret = init_fcc (context, id, &sp, &fd);
|
|
if (ret)
|
|
return ret;
|
|
ret = krb5_ret_principal(sp, principal);
|
|
krb5_storage_free(sp);
|
|
fcc_unlock(context, fd);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
fcc_end_get (krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_cc_cursor *cursor);
|
|
|
|
static krb5_error_code
|
|
fcc_get_first (krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_cc_cursor *cursor)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_principal principal;
|
|
|
|
*cursor = malloc(sizeof(struct fcc_cursor));
|
|
|
|
ret = init_fcc (context, id, &FCC_CURSOR(*cursor)->sp,
|
|
&FCC_CURSOR(*cursor)->fd);
|
|
if (ret) {
|
|
free(*cursor);
|
|
return ret;
|
|
}
|
|
ret = krb5_ret_principal (FCC_CURSOR(*cursor)->sp, &principal);
|
|
if(ret) {
|
|
fcc_end_get(context, id, cursor);
|
|
return ret;
|
|
}
|
|
krb5_free_principal (context, principal);
|
|
fcc_unlock(context, FCC_CURSOR(*cursor)->fd);
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
fcc_get_next (krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_cc_cursor *cursor,
|
|
krb5_creds *creds)
|
|
{
|
|
krb5_error_code ret;
|
|
if((ret = fcc_lock(context, id, FCC_CURSOR(*cursor)->fd, FALSE)) != 0)
|
|
return ret;
|
|
|
|
ret = krb5_ret_creds(FCC_CURSOR(*cursor)->sp, creds);
|
|
|
|
fcc_unlock(context, FCC_CURSOR(*cursor)->fd);
|
|
return ret;
|
|
}
|
|
|
|
static krb5_error_code
|
|
fcc_end_get (krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_cc_cursor *cursor)
|
|
{
|
|
krb5_storage_free(FCC_CURSOR(*cursor)->sp);
|
|
close (FCC_CURSOR(*cursor)->fd);
|
|
free(*cursor);
|
|
*cursor = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static krb5_error_code
|
|
fcc_remove_cred(krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_flags which,
|
|
krb5_creds *cred)
|
|
{
|
|
return 0; /* XXX */
|
|
}
|
|
|
|
static krb5_error_code
|
|
fcc_set_flags(krb5_context context,
|
|
krb5_ccache id,
|
|
krb5_flags flags)
|
|
{
|
|
return 0; /* XXX */
|
|
}
|
|
|
|
static krb5_error_code
|
|
fcc_get_version(krb5_context context,
|
|
krb5_ccache id)
|
|
{
|
|
return FCACHE(id)->version;
|
|
}
|
|
|
|
const krb5_cc_ops krb5_fcc_ops = {
|
|
"FILE",
|
|
fcc_get_name,
|
|
fcc_resolve,
|
|
fcc_gen_new,
|
|
fcc_initialize,
|
|
fcc_destroy,
|
|
fcc_close,
|
|
fcc_store_cred,
|
|
NULL, /* fcc_retrieve */
|
|
fcc_get_principal,
|
|
fcc_get_first,
|
|
fcc_get_next,
|
|
fcc_end_get,
|
|
fcc_remove_cred,
|
|
fcc_set_flags,
|
|
fcc_get_version
|
|
};
|