Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 1 | /* $OpenBSD: groupaccess.c,v 1.16 2015/05/04 06:10:48 djm Exp $ */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 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> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 29 | |
| 30 | #include <grp.h> |
| 31 | #include <unistd.h> |
| 32 | #include <stdarg.h> |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 33 | #include <stdlib.h> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 34 | #include <string.h> |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 35 | #include <limits.h> |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 36 | |
| 37 | #include "xmalloc.h" |
| 38 | #include "groupaccess.h" |
| 39 | #include "match.h" |
| 40 | #include "log.h" |
| 41 | |
| 42 | static int ngroups; |
| 43 | static char **groups_byname; |
| 44 | |
| 45 | /* |
| 46 | * Initialize group access list for user with primary (base) and |
| 47 | * supplementary groups. Return the number of groups in the list. |
| 48 | */ |
| 49 | int |
| 50 | ga_init(const char *user, gid_t base) |
| 51 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 52 | #if defined(ANDROID) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 53 | return 0; |
| 54 | #else |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 55 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 56 | gid_t *groups_bygid; |
| 57 | int i, j; |
| 58 | struct group *gr; |
| 59 | |
| 60 | if (ngroups > 0) |
| 61 | ga_free(); |
| 62 | |
| 63 | ngroups = NGROUPS_MAX; |
| 64 | #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX) |
| 65 | ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX)); |
| 66 | #endif |
| 67 | |
| 68 | groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid)); |
| 69 | groups_byname = xcalloc(ngroups, sizeof(*groups_byname)); |
| 70 | |
| 71 | if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) |
| 72 | logit("getgrouplist: groups list too small"); |
| 73 | for (i = 0, j = 0; i < ngroups; i++) |
| 74 | if ((gr = getgrgid(groups_bygid[i])) != NULL) |
| 75 | groups_byname[j++] = xstrdup(gr->gr_name); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 76 | free(groups_bygid); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 77 | return (ngroups = j); |
| 78 | #endif |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * Return 1 if one of user's groups is contained in groups. |
| 83 | * Return 0 otherwise. Use match_pattern() for string comparison. |
| 84 | */ |
| 85 | int |
| 86 | ga_match(char * const *groups, int n) |
| 87 | { |
| 88 | int i, j; |
| 89 | |
| 90 | for (i = 0; i < ngroups; i++) |
| 91 | for (j = 0; j < n; j++) |
| 92 | if (match_pattern(groups_byname[i], groups[j])) |
| 93 | return 1; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Return 1 if one of user's groups matches group_pattern list. |
| 99 | * Return 0 on negated or no match. |
| 100 | */ |
| 101 | int |
| 102 | ga_match_pattern_list(const char *group_pattern) |
| 103 | { |
| 104 | int i, found = 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 105 | |
| 106 | for (i = 0; i < ngroups; i++) { |
Greg Hartman | ccacbc9 | 2016-02-03 09:59:44 -0800 | [diff] [blame] | 107 | switch (match_pattern_list(groups_byname[i], group_pattern, 0)) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 108 | case -1: |
| 109 | return 0; /* Negated match wins */ |
| 110 | case 0: |
| 111 | continue; |
| 112 | case 1: |
| 113 | found = 1; |
| 114 | } |
| 115 | } |
| 116 | return found; |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Free memory allocated for group access list. |
| 121 | */ |
| 122 | void |
| 123 | ga_free(void) |
| 124 | { |
| 125 | int i; |
| 126 | |
| 127 | if (ngroups > 0) { |
| 128 | for (i = 0; i < ngroups; i++) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 129 | free(groups_byname[i]); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 130 | ngroups = 0; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 131 | free(groups_byname); |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 132 | } |
| 133 | } |