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pt_file.c revision 1.3 
      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  *	from: Id: pt_file.c,v 1.1 1992/05/25 21:43:09 jsp Exp
     38  *	from: @(#)pt_file.c	8.2 (Berkeley) 3/27/94
     39  *	$Id: pt_file.c,v 1.3 1994/06/08 19:24:55 mycroft Exp $
     40  */
     41 
     42 #include <stdio.h>
     43 #include <unistd.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <errno.h>
     47 #include <fcntl.h>
     48 #include <sys/types.h>
     49 #include <sys/param.h>
     50 #include <sys/syslog.h>
     51 
     52 #include "portald.h"
     53 
     54 int portal_file(pcr, key, v, so, fdp)
     55 struct portal_cred *pcr;
     56 char *key;
     57 char **v;
     58 int so;
     59 int *fdp;
     60 {
     61 	int fd;
     62 	char pbuf[MAXPATHLEN];
     63 	int error;
     64 	gid_t gidset[NGROUPS];
     65 	int i;
     66 
     67 	pbuf[0] = '/';
     68 	strcpy(pbuf+1, key + (v[1] ? strlen(v[1]) : 0));
     69 
     70 #ifdef DEBUG
     71 	printf("path = %s, uid = %d, gid = %d\n", pbuf, pcr->pcr_uid, pcr->pcr_groups[0]);
     72 #endif
     73 
     74 	for (i = 0; i < pcr->pcr_ngroups; i++)
     75 		gidset[i] = pcr->pcr_groups[i];
     76 
     77 	if (setgroups(pcr->pcr_ngroups, gidset) < 0)
     78 		return (errno);
     79 
     80 	if (seteuid(pcr->pcr_uid) < 0)
     81 		return (errno);
     82 
     83 	fd = open(pbuf, O_RDWR|O_CREAT, 0666);
     84 	if (fd < 0)
     85 		error = errno;
     86 	else
     87 		error = 0;
     88 
     89 	if (seteuid((uid_t) 0) < 0) {	/* XXX - should reset gidset too */
     90 		error = errno;
     91 		syslog(LOG_ERR, "setcred: %s", strerror(error));
     92 		if (fd >= 0) {
     93 			(void) close(fd);
     94 			fd = -1;
     95 		}
     96 	}
     97 
     98 	if (error == 0)
     99 		*fdp = fd;
    100 
    101 #ifdef DEBUG
    102 	fprintf(stderr, "pt_file returns *fdp = %d, error = %d\n", *fdp, error);
    103 #endif
    104 
    105 	return (error);
    106 }
    107