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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T 24 * Copyright 2001-2003 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 29 #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.78 */ 30 31 #include <sys/param.h> 32 #include <sys/types.h> 33 #include <sys/sysmacros.h> 34 #include <sys/systm.h> 35 #include <sys/cred_impl.h> 36 #include <sys/errno.h> 37 #include <sys/proc.h> 38 #include <sys/debug.h> 39 #include <sys/kmem.h> 40 #include <sys/policy.h> 41 42 int 43 setgroups(int gidsetsize, gid_t *gidset) 44 { 45 proc_t *p; 46 cred_t *cr, *newcr; 47 int i; 48 int n = gidsetsize; 49 gid_t *groups = NULL; 50 int error; 51 52 /* Perform the cheapest tests before grabbing p_crlock */ 53 if (n > ngroups_max || n < 0) 54 return (set_errno(EINVAL)); 55 56 if (n != 0) { 57 groups = kmem_alloc(n * sizeof (gid_t), KM_SLEEP); 58 59 if (copyin(gidset, groups, n * sizeof (gid_t)) != 0) { 60 kmem_free(groups, n * sizeof (gid_t)); 61 return (set_errno(EFAULT)); 62 } 63 64 for (i = 0; i < n; i++) { 65 if (groups[i] < 0 || groups[i] > MAXUID) { 66 kmem_free(groups, n * sizeof (gid_t)); 67 return (set_errno(EINVAL)); 68 } 69 } 70 } 71 72 /* 73 * Need to pre-allocate the new cred structure before acquiring 74 * the p_crlock mutex. 75 */ 76 newcr = cralloc(); 77 p = ttoproc(curthread); 78 mutex_enter(&p->p_crlock); 79 cr = p->p_cred; 80 81 if ((error = secpolicy_allow_setid(cr, -1, B_FALSE)) != 0) { 82 mutex_exit(&p->p_crlock); 83 if (groups != NULL) 84 kmem_free(groups, n * sizeof (gid_t)); 85 crfree(newcr); 86 return (set_errno(error)); 87 } 88 89 crdup_to(cr, newcr); 90 91 if (n != 0) { 92 bcopy(groups, newcr->cr_groups, n * sizeof (gid_t)); 93 kmem_free(groups, n * sizeof (gid_t)); 94 } 95 96 newcr->cr_ngroups = n; 97 98 p->p_cred = newcr; 99 crhold(newcr); /* hold for the current thread */ 100 crfree(cr); /* free the old one */ 101 mutex_exit(&p->p_crlock); 102 103 /* 104 * Broadcast new cred to process threads (including the current one). 105 */ 106 crset(p, newcr); 107 108 return (0); 109 } 110 111 int 112 getgroups(int gidsetsize, gid_t *gidset) 113 { 114 struct cred *cr; 115 int n; 116 117 cr = curthread->t_cred; 118 n = (int)cr->cr_ngroups; 119 120 if (gidsetsize != 0) { 121 if (gidsetsize < n) 122 return (set_errno(EINVAL)); 123 if (copyout(cr->cr_groups, gidset, n * sizeof (gid_t))) 124 return (set_errno(EFAULT)); 125 } 126 127 return (n); 128 } 129