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pt_file.c revision 1.4 
      1 /*	$NetBSD: pt_file.c,v 1.4 1995/03/18 14:58:04 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  * All rights reserved.
      7  *
      8  * This code is derived from software donated to Berkeley by
      9  * Jan-Simon Pendry.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  *	from: Id: pt_file.c,v 1.1 1992/05/25 21:43:09 jsp Exp
     40  *	@(#)pt_file.c	8.2 (Berkeley) 3/27/94
     41  */
     42 
     43 #include <stdio.h>
     44 #include <unistd.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <errno.h>
     48 #include <fcntl.h>
     49 #include <sys/types.h>
     50 #include <sys/param.h>
     51 #include <sys/syslog.h>
     52 
     53 #include "portald.h"
     54 
     55 int portal_file(pcr, key, v, so, fdp)
     56 struct portal_cred *pcr;
     57 char *key;
     58 char **v;
     59 int so;
     60 int *fdp;
     61 {
     62 	int fd;
     63 	char pbuf[MAXPATHLEN];
     64 	int error;
     65 	gid_t gidset[NGROUPS];
     66 	int i;
     67 
     68 	pbuf[0] = '/';
     69 	strcpy(pbuf+1, key + (v[1] ? strlen(v[1]) : 0));
     70 
     71 #ifdef DEBUG
     72 	printf("path = %s, uid = %d, gid = %d\n", pbuf, pcr->pcr_uid, pcr->pcr_groups[0]);
     73 #endif
     74 
     75 	for (i = 0; i < pcr->pcr_ngroups; i++)
     76 		gidset[i] = pcr->pcr_groups[i];
     77 
     78 	if (setgroups(pcr->pcr_ngroups, gidset) < 0)
     79 		return (errno);
     80 
     81 	if (seteuid(pcr->pcr_uid) < 0)
     82 		return (errno);
     83 
     84 	fd = open(pbuf, O_RDWR|O_CREAT, 0666);
     85 	if (fd < 0)
     86 		error = errno;
     87 	else
     88 		error = 0;
     89 
     90 	if (seteuid((uid_t) 0) < 0) {	/* XXX - should reset gidset too */
     91 		error = errno;
     92 		syslog(LOG_ERR, "setcred: %s", strerror(error));
     93 		if (fd >= 0) {
     94 			(void) close(fd);
     95 			fd = -1;
     96 		}
     97 	}
     98 
     99 	if (error == 0)
    100 		*fdp = fd;
    101 
    102 #ifdef DEBUG
    103 	fprintf(stderr, "pt_file returns *fdp = %d, error = %d\n", *fdp, error);
    104 #endif
    105 
    106 	return (error);
    107 }
    108