Annotation of embedaddon/sudo/plugins/system_group/system_group.c, revision 1.1.1.4
1.1 misho 1: /*
1.1.1.4 ! misho 2: * Copyright (c) 2010-2014 Todd C. Miller <Todd.Miller@courtesan.com>
1.1 misho 3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <config.h>
18:
19: #include <sys/types.h>
20: #include <sys/stat.h>
21:
22: #include <stdio.h>
23: #ifdef STDC_HEADERS
24: # include <stdlib.h>
25: # include <stddef.h>
26: #else
27: # ifdef HAVE_STDLIB_H
28: # include <stdlib.h>
29: # endif
30: #endif /* STDC_HEADERS */
31: #ifdef HAVE_STDBOOL_H
32: # include <stdbool.h>
33: #else
34: # include "compat/stdbool.h"
35: #endif /* HAVE_STDBOOL_H */
36: #ifdef HAVE_STRING_H
37: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
38: # include <memory.h>
39: # endif
40: # include <string.h>
41: #endif /* HAVE_STRING_H */
42: #ifdef HAVE_STRINGS_H
43: # include <strings.h>
44: #endif /* HAVE_STRINGS_H */
45: #ifdef HAVE_UNISTD_H
46: # include <unistd.h>
47: #endif /* HAVE_UNISTD_H */
48: #include <ctype.h>
49: #include <errno.h>
50: #include <fcntl.h>
51: #include <limits.h>
52: #include <grp.h>
53: #include <pwd.h>
54:
55: #include "missing.h"
1.1.1.4 ! misho 56: #include "sudo_dso.h"
! 57: #include "sudo_plugin.h"
! 58: #include "sudo_util.h"
1.1 misho 59:
60: /*
61: * Sudoers group plugin that does group name-based lookups using the system
62: * group database functions, similar to how sudo behaved prior to 1.7.3.
63: * This can be used on systems where lookups by group ID are problematic.
64: */
65:
66: static sudo_printf_t sudo_log;
67:
68: typedef struct group * (*sysgroup_getgrnam_t)(const char *);
69: typedef struct group * (*sysgroup_getgrgid_t)(gid_t);
70: typedef void (*sysgroup_gr_delref_t)(struct group *);
71:
72: static sysgroup_getgrnam_t sysgroup_getgrnam;
73: static sysgroup_getgrgid_t sysgroup_getgrgid;
74: static sysgroup_gr_delref_t sysgroup_gr_delref;
75: static bool need_setent;
76:
77: static int
78: sysgroup_init(int version, sudo_printf_t sudo_printf, char *const argv[])
79: {
80: void *handle;
81:
82: sudo_log = sudo_printf;
83:
84: if (GROUP_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
85: sudo_log(SUDO_CONV_ERROR_MSG,
86: "sysgroup_group: incompatible major version %d, expected %d\n",
87: GROUP_API_VERSION_GET_MAJOR(version),
88: GROUP_API_VERSION_MAJOR);
89: return -1;
90: }
91:
92: /* Share group cache with sudo if possible. */
1.1.1.4 ! misho 93: handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrnam");
1.1 misho 94: if (handle != NULL) {
95: sysgroup_getgrnam = (sysgroup_getgrnam_t)handle;
96: } else {
97: sysgroup_getgrnam = (sysgroup_getgrnam_t)getgrnam;
98: need_setent = true;
99: }
100:
1.1.1.4 ! misho 101: handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrgid");
1.1 misho 102: if (handle != NULL) {
103: sysgroup_getgrgid = (sysgroup_getgrgid_t)handle;
104: } else {
105: sysgroup_getgrgid = (sysgroup_getgrgid_t)getgrgid;
106: need_setent = true;
107: }
108:
1.1.1.4 ! misho 109: handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_gr_delref");
1.1 misho 110: if (handle != NULL)
111: sysgroup_gr_delref = (sysgroup_gr_delref_t)handle;
112:
113: if (need_setent)
114: setgrent();
115:
116: return true;
117: }
118:
119: static void
120: sysgroup_cleanup(void)
121: {
122: if (need_setent)
123: endgrent();
124: }
125:
126: /*
127: * Returns true if "user" is a member of "group", else false.
128: */
129: static int
130: sysgroup_query(const char *user, const char *group, const struct passwd *pwd)
131: {
1.1.1.4 ! misho 132: char **member;
1.1 misho 133: struct group *grp;
134:
135: grp = sysgroup_getgrnam(group);
136: if (grp == NULL && group[0] == '#' && group[1] != '\0') {
1.1.1.4 ! misho 137: const char *errstr;
! 138: gid_t gid = atoid(group + 1, NULL, NULL, &errstr);
! 139: if (errstr == NULL)
! 140: grp = sysgroup_getgrgid(gid);
1.1 misho 141: }
142: if (grp != NULL) {
1.1.1.4 ! misho 143: if (grp->gr_mem != NULL) {
! 144: for (member = grp->gr_mem; *member != NULL; member++) {
! 145: if (strcasecmp(user, *member) == 0) {
! 146: if (sysgroup_gr_delref)
! 147: sysgroup_gr_delref(grp);
! 148: return true;
! 149: }
1.1 misho 150: }
151: }
152: if (sysgroup_gr_delref)
153: sysgroup_gr_delref(grp);
154: }
155:
156: return false;
157: }
158:
1.1.1.3 misho 159: __dso_public struct sudoers_group_plugin group_plugin = {
1.1 misho 160: GROUP_API_VERSION,
161: sysgroup_init,
162: sysgroup_cleanup,
163: sysgroup_query
164: };
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