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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 
     28 #pragma ident	"@(#)groups.c	1.10	08/01/04 SMI"	/* from SVr4.0 1.78 */
     29 
     30 #include <sys/param.h>
     31 #include <sys/types.h>
     32 #include <sys/sysmacros.h>
     33 #include <sys/systm.h>
     34 #include <sys/cred_impl.h>
     35 #include <sys/errno.h>
     36 #include <sys/proc.h>
     37 #include <sys/debug.h>
     38 #include <sys/kmem.h>
     39 #include <sys/policy.h>
     40 
     41 int
     42 setgroups(int gidsetsize, gid_t *gidset)
     43 {
     44 	proc_t	*p;
     45 	cred_t	*cr, *newcr;
     46 	int	i;
     47 	int	n = gidsetsize;
     48 	gid_t	*groups = NULL;
     49 	int	error;
     50 	int	scnt = 0;
     51 	ksidlist_t *ksl = NULL;
     52 	zone_t	*zone;
     53 
     54 	/* Perform the cheapest tests before grabbing p_crlock  */
     55 	if (n > ngroups_max || n < 0)
     56 		return (set_errno(EINVAL));
     57 
     58 	zone = crgetzone(CRED());
     59 	if (n != 0) {
     60 		groups = kmem_alloc(n * sizeof (gid_t), KM_SLEEP);
     61 
     62 		if (copyin(gidset, groups, n * sizeof (gid_t)) != 0) {
     63 			kmem_free(groups, n * sizeof (gid_t));
     64 			return (set_errno(EFAULT));
     65 		}
     66 
     67 		for (i = 0; i < n; i++) {
     68 			if (!VALID_GID(groups[i], zone)) {
     69 				kmem_free(groups, n * sizeof (gid_t));
     70 				return (set_errno(EINVAL));
     71 			}
     72 			if (groups[i] > MAXUID)
     73 				scnt++;
     74 		}
     75 		if (scnt > 0) {
     76 			ksl = kcrsid_gidstosids(zone, n, groups);
     77 			if (ksl == NULL) {
     78 				kmem_free(groups, n * sizeof (gid_t));
     79 				return (set_errno(EINVAL));
     80 			}
     81 		}
     82 	}
     83 
     84 
     85 	/*
     86 	 * Need to pre-allocate the new cred structure before acquiring
     87 	 * the p_crlock mutex.
     88 	 */
     89 	newcr = cralloc_ksid();
     90 	p = ttoproc(curthread);
     91 	mutex_enter(&p->p_crlock);
     92 	cr = p->p_cred;
     93 
     94 	if ((error = secpolicy_allow_setid(cr, -1, B_FALSE)) != 0) {
     95 		mutex_exit(&p->p_crlock);
     96 		if (groups != NULL)
     97 			kmem_free(groups, n * sizeof (gid_t));
     98 		if (ksl != NULL)
     99 			ksidlist_rele(ksl);
    100 		crfree(newcr);
    101 		return (set_errno(error));
    102 	}
    103 
    104 	crdup_to(cr, newcr);
    105 	crsetsidlist(newcr, ksl);
    106 
    107 	if (n != 0) {
    108 		bcopy(groups, newcr->cr_groups, n * sizeof (gid_t));
    109 		kmem_free(groups, n * sizeof (gid_t));
    110 	}
    111 
    112 	newcr->cr_ngroups = n;
    113 
    114 	p->p_cred = newcr;
    115 	crhold(newcr);			/* hold for the current thread */
    116 	crfree(cr);			/* free the old one */
    117 	mutex_exit(&p->p_crlock);
    118 
    119 	/*
    120 	 * Broadcast new cred to process threads (including the current one).
    121 	 */
    122 	crset(p, newcr);
    123 
    124 	return (0);
    125 }
    126 
    127 int
    128 getgroups(int gidsetsize, gid_t *gidset)
    129 {
    130 	struct cred *cr;
    131 	int n;
    132 
    133 	cr = curthread->t_cred;
    134 	n = (int)cr->cr_ngroups;
    135 
    136 	if (gidsetsize != 0) {
    137 		if (gidsetsize < n)
    138 			return (set_errno(EINVAL));
    139 		if (copyout(cr->cr_groups, gidset, n * sizeof (gid_t)))
    140 			return (set_errno(EFAULT));
    141 	}
    142 
    143 	return (n);
    144 }
    145