sbin/mount_portal/pt_file.c

   1 /*
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * All rights reserved.
   5  *
   6  * This code is derived from software donated to Berkeley by
   7  * Jan-Simon Pendry.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      @(#)pt_file.c   8.3 (Berkeley) 7/3/94
  38  *
  39  * $FreeBSD: src/sbin/mount_portal/pt_file.c,v 1.8 1999/08/28 00:13:38 peter Exp $
  40  * $DragonFly: src/sbin/mount_portal/pt_file.c,v 1.5 2005/11/06 12:36:40 swildner Exp $
  41  */
  42
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <sys/types.h>
  48 #include <sys/param.h>
  49 #include <sys/syslog.h>
  50
  51 #include "portald.h"
  52
  53 int
  54 portal_file(struct portal_cred *pcr, char *key, char **v, int so, int *fdp)
  55 {
  56         int fd;
  57         char pbuf[MAXPATHLEN];
  58         int error;
  59         gid_t gidset[NGROUPS];
  60         int i;
  61
  62         pbuf[0] = '/';
  63         strcpy(pbuf+1, key + (v[1] ? strlen(v[1]) : 0));
  64
  65 #ifdef DEBUG
  66         printf("path = %s, uid = %d, gid = %d\n", pbuf, pcr->pcr_uid, pcr->pcr_groups[0]);
  67         printf ("fflag = %x, oflag = %x\n", pcr->pcr_flag, (pcr->pcr_flag)-1);
  68 #endif
  69
  70         for (i = 0; i < pcr->pcr_ngroups; i++)
  71                 gidset[i] = pcr->pcr_groups[i];
  72
  73         if (setgroups(pcr->pcr_ngroups, gidset) < 0)
  74                 return (errno);
  75
  76         if (seteuid(pcr->pcr_uid) < 0)
  77                 return (errno);
  78
  79         /* dmb convert kernel flags to oflags, see <fcntl.h> */
  80         fd = open(pbuf, (pcr->pcr_flag)-1, 0777);
  81         if (fd < 0)
  82                 error = errno;
  83         else
  84                 error = 0;
  85
  86         if (seteuid((uid_t) 0) < 0) {   /* XXX - should reset gidset too */
  87                 error = errno;
  88                 syslog(LOG_ERR, "setcred: %s", strerror(error));
  89                 if (fd >= 0) {
  90                         close(fd);
  91                         fd = -1;
  92                 }
  93         }
  94
  95         if (error == 0)
  96                 *fdp = fd;
  97
  98 #ifdef DEBUG
  99         fprintf(stderr, "pt_file returns *fdp = %d, error = %d\n", *fdp, error);
 100 #endif
 101
 102         return (error);
 103 }