1 /* $OpenBSD: groupaccess.c,v 1.13 2008/07/04 03:44:59 djm Exp $ */ 2 /* 3 * Copyright (c) 2001 Kevin Steves. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "includes.h" 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 31 #include <grp.h> 32 #include <unistd.h> 33 #include <stdarg.h> 34 #include <string.h> 35 36 #include "xmalloc.h" 37 #include "groupaccess.h" 38 #include "match.h" 39 #include "log.h" 40 41 static int ngroups; 42 static char **groups_byname; 43 44 /* 45 * Initialize group access list for user with primary (base) and 46 * supplementary groups. Return the number of groups in the list. 47 */ 48 int 49 ga_init(const char *user, gid_t base) 50 { 51 gid_t *groups_bygid; 52 int i, j; 53 struct group *gr; 54 55 if (ngroups > 0) 56 ga_free(); 57 58 ngroups = NGROUPS_MAX; 59 #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX) 60 ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX)); 61 #endif 62 63 groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid)); 64 groups_byname = xcalloc(ngroups, sizeof(*groups_byname)); 65 66 if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) 67 logit("getgrouplist: groups list too small"); 68 for (i = 0, j = 0; i < ngroups; i++) 69 if ((gr = getgrgid(groups_bygid[i])) != NULL) 70 groups_byname[j++] = xstrdup(gr->gr_name); 71 xfree(groups_bygid); 72 return (ngroups = j); 73 } 74 75 /* 76 * Return 1 if one of user's groups is contained in groups. 77 * Return 0 otherwise. Use match_pattern() for string comparison. 78 */ 79 int 80 ga_match(char * const *groups, int n) 81 { 82 int i, j; 83 84 for (i = 0; i < ngroups; i++) 85 for (j = 0; j < n; j++) 86 if (match_pattern(groups_byname[i], groups[j])) 87 return 1; 88 return 0; 89 } 90 91 /* 92 * Return 1 if one of user's groups matches group_pattern list. 93 * Return 0 on negated or no match. 94 */ 95 int 96 ga_match_pattern_list(const char *group_pattern) 97 { 98 int i, found = 0; 99 size_t len = strlen(group_pattern); 100 101 for (i = 0; i < ngroups; i++) { 102 switch (match_pattern_list(groups_byname[i], 103 group_pattern, len, 0)) { 104 case -1: 105 return 0; /* Negated match wins */ 106 case 0: 107 continue; 108 case 1: 109 found = 1; 110 } 111 } 112 return found; 113 } 114 115 /* 116 * Free memory allocated for group access list. 117 */ 118 void 119 ga_free(void) 120 { 121 int i; 122 123 if (ngroups > 0) { 124 for (i = 0; i < ngroups; i++) 125 xfree(groups_byname[i]); 126 ngroups = 0; 127 xfree(groups_byname); 128 } 129 } 130