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pt_file.c revision 1.10 
      1 /*	$NetBSD: pt_file.c,v 1.10 1997/09/21 02:35:43 enami Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software donated to Berkeley by
      8  * Jan-Simon Pendry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	from: Id: pt_file.c,v 1.1 1992/05/25 21:43:09 jsp Exp
     39  *	@(#)pt_file.c	8.3 (Berkeley) 7/3/94
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 #ifndef lint
     44 __RCSID("$NetBSD: pt_file.c,v 1.10 1997/09/21 02:35:43 enami Exp $");
     45 #endif /* not lint */
     46 
     47 #include <stdio.h>
     48 #include <unistd.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <errno.h>
     52 #include <fcntl.h>
     53 #include <sys/types.h>
     54 #include <sys/param.h>
     55 #include <sys/syslog.h>
     56 
     57 #include "portald.h"
     58 
     59 int
     60 portal_file(pcr, key, v, so, fdp)
     61 	struct portal_cred *pcr;
     62 	char *key;
     63 	char **v;
     64 	int so;
     65 	int *fdp;
     66 {
     67 	int fd;
     68 	char pbuf[MAXPATHLEN];
     69 	int error;
     70 
     71 	pbuf[0] = '/';
     72 	strcpy(pbuf+1, key + (v[1] ? strlen(v[1]) : 0));
     73 
     74 #ifdef DEBUG
     75 	printf("path = %s, uid = %d, gid = %d\n", pbuf, pcr->pcr_uid,
     76 	    pcr->pcr_gid);
     77 #endif
     78 
     79 	if (setegid(pcr->pcr_gid) < 0 ||
     80 	    setgroups(pcr->pcr_ngroups, pcr->pcr_groups) < 0)
     81 		return (errno);
     82 
     83 	if (seteuid(pcr->pcr_uid) < 0)
     84 		return (errno);
     85 
     86 	fd = open(pbuf, O_RDWR|O_CREAT, 0666);
     87 	if (fd < 0)
     88 		error = errno;
     89 	else
     90 		error = 0;
     91 
     92 	if (seteuid((uid_t) 0) < 0) {	/* XXX - should reset gidset too */
     93 		error = errno;
     94 		syslog(LOG_ERR, "setcred: %m");
     95 		if (fd >= 0) {
     96 			(void) close(fd);
     97 			fd = -1;
     98 		}
     99 	}
    100 
    101 	if (error == 0)
    102 		*fdp = fd;
    103 
    104 #ifdef DEBUG
    105 	fprintf(stderr, "pt_file returns *fdp = %d, error = %d\n", *fdp,
    106 	    error);
    107 #endif
    108 
    109 	return (error);
    110 }
    111