1 /* $OpenBSD: groupaccess.c,v 1.4 2001/06/26 17:27:23 markus Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Kevin Steves. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 29 #include "groupaccess.h" 30 #include "xmalloc.h" 31 #include "match.h" 32 #include "log.h" 33 34 static int ngroups; 35 static char *groups_byname[NGROUPS_MAX + 1]; /* +1 for base/primary group */ 36 37 /* 38 * Initialize group access list for user with primary (base) and 39 * supplementary groups. Return the number of groups in the list. 40 */ 41 int 42 ga_init(const char *user, gid_t base) 43 { 44 gid_t groups_bygid[NGROUPS_MAX + 1]; 45 int i, j; 46 struct group *gr; 47 48 if (ngroups > 0) 49 ga_free(); 50 51 ngroups = sizeof(groups_bygid) / sizeof(gid_t); 52 if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) 53 log("getgrouplist: groups list too small"); 54 for (i = 0, j = 0; i < ngroups; i++) 55 if ((gr = getgrgid(groups_bygid[i])) != NULL) 56 groups_byname[j++] = xstrdup(gr->gr_name); 57 return (ngroups = j); 58 } 59 60 /* 61 * Return 1 if one of user's groups is contained in groups. 62 * Return 0 otherwise. Use match_pattern() for string comparison. 63 */ 64 int 65 ga_match(char * const *groups, int n) 66 { 67 int i, j; 68 69 for (i = 0; i < ngroups; i++) 70 for (j = 0; j < n; j++) 71 if (match_pattern(groups_byname[i], groups[j])) 72 return 1; 73 return 0; 74 } 75 76 /* 77 * Free memory allocated for group access list. 78 */ 79 void 80 ga_free(void) 81 { 82 int i; 83 84 if (ngroups > 0) { 85 for (i = 0; i < ngroups; i++) 86 xfree(groups_byname[i]); 87 ngroups = 0; 88 } 89 } 90