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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 2009 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 
     28 #include <sys/param.h>
     29 #include <sys/types.h>
     30 #include <sys/sysmacros.h>
     31 #include <sys/systm.h>
     32 #include <sys/cred.h>
     33 #include <sys/sid.h>
     34 #include <sys/errno.h>
     35 #include <sys/proc.h>
     36 #include <sys/debug.h>
     37 #include <sys/kmem.h>
     38 #include <sys/policy.h>
     39 
     40 int
     41 setgroups(int gidsetsize, gid_t *gidset)
     42 {
     43 	proc_t	*p;
     44 	cred_t	*cr, *newcr;
     45 	int	i;
     46 	int	n = gidsetsize;
     47 	int	error;
     48 	int	scnt = 0;
     49 	ksidlist_t *ksl = NULL;
     50 	zone_t	*zone;
     51 	struct credgrp *grps = NULL;
     52 
     53 	/* Perform the cheapest tests before grabbing p_crlock  */
     54 	if (n > ngroups_max || n < 0)
     55 		return (set_errno(EINVAL));
     56 
     57 	zone = crgetzone(CRED());
     58 	if (n != 0) {
     59 		const gid_t *groups;
     60 
     61 		grps = crgrpcopyin(n, gidset);
     62 
     63 		if (grps == NULL)
     64 			return (set_errno(EFAULT));
     65 
     66 		groups = crgetggroups(grps);
     67 
     68 		for (i = 0; i < n; i++) {
     69 			if (!VALID_GID(groups[i], zone)) {
     70 				crgrprele(grps);
     71 				return (set_errno(EINVAL));
     72 			}
     73 			if (groups[i] > MAXUID)
     74 				scnt++;
     75 		}
     76 		if (scnt > 0) {
     77 			ksl = kcrsid_gidstosids(zone, n, (gid_t *)groups);
     78 			if (ksl == NULL) {
     79 				crgrprele(grps);
     80 				return (set_errno(EINVAL));
     81 			}
     82 		}
     83 	}
     84 
     85 
     86 	/*
     87 	 * Need to pre-allocate the new cred structure before acquiring
     88 	 * the p_crlock mutex.
     89 	 */
     90 	newcr = cralloc_ksid();
     91 	p = ttoproc(curthread);
     92 	mutex_enter(&p->p_crlock);
     93 retry:
     94 	cr = p->p_cred;
     95 	crhold(cr);
     96 	mutex_exit(&p->p_crlock);
     97 
     98 	if ((error = secpolicy_allow_setid(cr, -1, B_FALSE)) != 0) {
     99 		if (grps != NULL)
    100 			crgrprele(grps);
    101 		if (ksl != NULL)
    102 			ksidlist_rele(ksl);
    103 		crfree(newcr);
    104 		crfree(cr);
    105 		return (set_errno(error));
    106 	}
    107 	mutex_enter(&p->p_crlock);
    108 	crfree(cr);
    109 	if (cr != p->p_cred)
    110 		goto retry;
    111 
    112 	crdup_to(cr, newcr);
    113 	crsetsidlist(newcr, ksl);
    114 	crsetcredgrp(newcr, grps);
    115 
    116 	p->p_cred = newcr;
    117 	crhold(newcr);			/* hold for the current thread */
    118 	crfree(cr);			/* free the old one */
    119 	mutex_exit(&p->p_crlock);
    120 
    121 	/*
    122 	 * Broadcast new cred to process threads (including the current one).
    123 	 */
    124 	crset(p, newcr);
    125 
    126 	return (0);
    127 }
    128 
    129 int
    130 getgroups(int gidsetsize, gid_t *gidset)
    131 {
    132 	struct cred *cr;
    133 	int n;
    134 
    135 	cr = curthread->t_cred;
    136 	n = crgetngroups(cr);
    137 
    138 	if (gidsetsize != 0) {
    139 		if (gidsetsize < n)
    140 			return (set_errno(EINVAL));
    141 		if (copyout(crgetgroups(cr), gidset, n * sizeof (gid_t)))
    142 			return (set_errno(EFAULT));
    143 	}
    144 
    145 	return (n);
    146 }
    147