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 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #pragma weak _initgroups = initgroups 33 34 #include "lint.h" 35 #include <stdlib.h> 36 #include <errno.h> 37 #include <grp.h> 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <unistd.h> 41 42 /* Private interface to the groups code in getgrnam.c */ 43 extern int _getgroupsbymember(const char *, gid_t[], int, int); 44 45 int 46 initgroups(const char *uname, gid_t agroup) 47 { 48 gid_t *groups; 49 long ngroups_max; 50 int ngroups; 51 int errsave, retsave; 52 53 if ((ngroups_max = sysconf(_SC_NGROUPS_MAX)) < 0) { 54 /* ==== Hope sysconf() set errno to something sensible */ 55 return (-1); 56 } 57 /* 58 * ngroups_max is the maximum number of supplemental groups per 59 * process. if no supplemental groups are allowed, we're done. 60 */ 61 if (ngroups_max == 0) 62 return (0); 63 64 if ((groups = (gid_t *)calloc(ngroups_max, sizeof (gid_t))) == 0) { 65 errno = ENOMEM; 66 return (-1); 67 } 68 groups[0] = agroup; 69 70 ngroups = _getgroupsbymember(uname, groups, (int)ngroups_max, 71 (agroup <= MAXUID) ? 1 : 0); 72 if (ngroups < 0) { 73 /* XXX -- man page does not define a value for errno in */ 74 /* this case. Should be looked into sometime. */ 75 free(groups); 76 return (-1); 77 } 78 79 retsave = setgroups(ngroups, groups); 80 errsave = errno; 81 82 free(groups); 83 84 errno = errsave; 85 return (retsave); 86 } 87