Annotation of embedaddon/sudo/plugins/system_group/system_group.c, revision 1.1.1.3
1.1 misho 1: /*
1.1.1.3 ! misho 2: * Copyright (c) 2010-2013 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: #ifdef HAVE_DLOPEN
49: # include <dlfcn.h>
50: #else
51: # include "compat/dlfcn.h"
52: #endif
53: #include <ctype.h>
54: #include <errno.h>
55: #include <fcntl.h>
56: #include <limits.h>
57: #include <grp.h>
58: #include <pwd.h>
59:
60: #include "sudo_plugin.h"
61: #include "missing.h"
62:
63: #ifndef RTLD_DEFAULT
64: # define RTLD_DEFAULT NULL
65: #endif
66:
67: /*
68: * Sudoers group plugin that does group name-based lookups using the system
69: * group database functions, similar to how sudo behaved prior to 1.7.3.
70: * This can be used on systems where lookups by group ID are problematic.
71: */
72:
73: static sudo_printf_t sudo_log;
74:
75: typedef struct group * (*sysgroup_getgrnam_t)(const char *);
76: typedef struct group * (*sysgroup_getgrgid_t)(gid_t);
77: typedef void (*sysgroup_gr_delref_t)(struct group *);
78:
79: static sysgroup_getgrnam_t sysgroup_getgrnam;
80: static sysgroup_getgrgid_t sysgroup_getgrgid;
81: static sysgroup_gr_delref_t sysgroup_gr_delref;
82: static bool need_setent;
83:
84: static int
85: sysgroup_init(int version, sudo_printf_t sudo_printf, char *const argv[])
86: {
87: void *handle;
88:
89: sudo_log = sudo_printf;
90:
91: if (GROUP_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
92: sudo_log(SUDO_CONV_ERROR_MSG,
93: "sysgroup_group: incompatible major version %d, expected %d\n",
94: GROUP_API_VERSION_GET_MAJOR(version),
95: GROUP_API_VERSION_MAJOR);
96: return -1;
97: }
98:
99: /* Share group cache with sudo if possible. */
100: handle = dlsym(RTLD_DEFAULT, "sudo_getgrnam");
101: if (handle != NULL) {
102: sysgroup_getgrnam = (sysgroup_getgrnam_t)handle;
103: } else {
104: sysgroup_getgrnam = (sysgroup_getgrnam_t)getgrnam;
105: need_setent = true;
106: }
107:
108: handle = dlsym(RTLD_DEFAULT, "sudo_getgrgid");
109: if (handle != NULL) {
110: sysgroup_getgrgid = (sysgroup_getgrgid_t)handle;
111: } else {
112: sysgroup_getgrgid = (sysgroup_getgrgid_t)getgrgid;
113: need_setent = true;
114: }
115:
1.1.1.2 misho 116: handle = dlsym(RTLD_DEFAULT, "sudo_gr_delref");
1.1 misho 117: if (handle != NULL)
118: sysgroup_gr_delref = (sysgroup_gr_delref_t)handle;
119:
120: if (need_setent)
121: setgrent();
122:
123: return true;
124: }
125:
126: static void
127: sysgroup_cleanup(void)
128: {
129: if (need_setent)
130: endgrent();
131: }
132:
133: /*
134: * Returns true if "user" is a member of "group", else false.
135: */
136: static int
137: sysgroup_query(const char *user, const char *group, const struct passwd *pwd)
138: {
139: char **member, *ep = '\0';
140: struct group *grp;
141:
142: grp = sysgroup_getgrnam(group);
143: if (grp == NULL && group[0] == '#' && group[1] != '\0') {
144: long lval = strtol(group + 1, &ep, 10);
145: if (*ep == '\0') {
146: if ((lval != LONG_MAX && lval != LONG_MIN) || errno != ERANGE)
147: grp = sysgroup_getgrgid((gid_t)lval);
148: }
149: }
150: if (grp != NULL) {
151: for (member = grp->gr_mem; *member != NULL; member++) {
152: if (strcasecmp(user, *member) == 0) {
153: if (sysgroup_gr_delref)
154: sysgroup_gr_delref(grp);
155: return true;
156: }
157: }
158: if (sysgroup_gr_delref)
159: sysgroup_gr_delref(grp);
160: }
161:
162: return false;
163: }
164:
1.1.1.3 ! misho 165: __dso_public struct sudoers_group_plugin group_plugin = {
1.1 misho 166: GROUP_API_VERSION,
167: sysgroup_init,
168: sysgroup_cleanup,
169: sysgroup_query
170: };
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