Annotation of embedaddon/sudo/plugins/system_group/system_group.c, revision 1.1.1.2
1.1 misho 1: /*
2: * Copyright (c) 2010, 2012 Todd C. Miller <Todd.Miller@courtesan.com>
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/param.h>
21: #include <sys/stat.h>
22:
23: #include <stdio.h>
24: #ifdef STDC_HEADERS
25: # include <stdlib.h>
26: # include <stddef.h>
27: #else
28: # ifdef HAVE_STDLIB_H
29: # include <stdlib.h>
30: # endif
31: #endif /* STDC_HEADERS */
32: #ifdef HAVE_STDBOOL_H
33: # include <stdbool.h>
34: #else
35: # include "compat/stdbool.h"
36: #endif /* HAVE_STDBOOL_H */
37: #ifdef HAVE_STRING_H
38: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
39: # include <memory.h>
40: # endif
41: # include <string.h>
42: #endif /* HAVE_STRING_H */
43: #ifdef HAVE_STRINGS_H
44: # include <strings.h>
45: #endif /* HAVE_STRINGS_H */
46: #ifdef HAVE_UNISTD_H
47: # include <unistd.h>
48: #endif /* HAVE_UNISTD_H */
49: #ifdef HAVE_DLOPEN
50: # include <dlfcn.h>
51: #else
52: # include "compat/dlfcn.h"
53: #endif
54: #include <ctype.h>
55: #include <errno.h>
56: #include <fcntl.h>
57: #include <limits.h>
58: #include <grp.h>
59: #include <pwd.h>
60:
61: #include "sudo_plugin.h"
62: #include "missing.h"
63:
64: #ifndef RTLD_DEFAULT
65: # define RTLD_DEFAULT NULL
66: #endif
67:
68: /*
69: * Sudoers group plugin that does group name-based lookups using the system
70: * group database functions, similar to how sudo behaved prior to 1.7.3.
71: * This can be used on systems where lookups by group ID are problematic.
72: */
73:
74: static sudo_printf_t sudo_log;
75:
76: typedef struct group * (*sysgroup_getgrnam_t)(const char *);
77: typedef struct group * (*sysgroup_getgrgid_t)(gid_t);
78: typedef void (*sysgroup_gr_delref_t)(struct group *);
79:
80: static sysgroup_getgrnam_t sysgroup_getgrnam;
81: static sysgroup_getgrgid_t sysgroup_getgrgid;
82: static sysgroup_gr_delref_t sysgroup_gr_delref;
83: static bool need_setent;
84:
85: static int
86: sysgroup_init(int version, sudo_printf_t sudo_printf, char *const argv[])
87: {
88: void *handle;
89:
90: sudo_log = sudo_printf;
91:
92: if (GROUP_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
93: sudo_log(SUDO_CONV_ERROR_MSG,
94: "sysgroup_group: incompatible major version %d, expected %d\n",
95: GROUP_API_VERSION_GET_MAJOR(version),
96: GROUP_API_VERSION_MAJOR);
97: return -1;
98: }
99:
100: /* Share group cache with sudo if possible. */
101: handle = dlsym(RTLD_DEFAULT, "sudo_getgrnam");
102: if (handle != NULL) {
103: sysgroup_getgrnam = (sysgroup_getgrnam_t)handle;
104: } else {
105: sysgroup_getgrnam = (sysgroup_getgrnam_t)getgrnam;
106: need_setent = true;
107: }
108:
109: handle = dlsym(RTLD_DEFAULT, "sudo_getgrgid");
110: if (handle != NULL) {
111: sysgroup_getgrgid = (sysgroup_getgrgid_t)handle;
112: } else {
113: sysgroup_getgrgid = (sysgroup_getgrgid_t)getgrgid;
114: need_setent = true;
115: }
116:
1.1.1.2 ! misho 117: handle = dlsym(RTLD_DEFAULT, "sudo_gr_delref");
1.1 misho 118: if (handle != NULL)
119: sysgroup_gr_delref = (sysgroup_gr_delref_t)handle;
120:
121: if (need_setent)
122: setgrent();
123:
124: return true;
125: }
126:
127: static void
128: sysgroup_cleanup(void)
129: {
130: if (need_setent)
131: endgrent();
132: }
133:
134: /*
135: * Returns true if "user" is a member of "group", else false.
136: */
137: static int
138: sysgroup_query(const char *user, const char *group, const struct passwd *pwd)
139: {
140: char **member, *ep = '\0';
141: struct group *grp;
142:
143: grp = sysgroup_getgrnam(group);
144: if (grp == NULL && group[0] == '#' && group[1] != '\0') {
145: long lval = strtol(group + 1, &ep, 10);
146: if (*ep == '\0') {
147: if ((lval != LONG_MAX && lval != LONG_MIN) || errno != ERANGE)
148: grp = sysgroup_getgrgid((gid_t)lval);
149: }
150: }
151: if (grp != NULL) {
152: for (member = grp->gr_mem; *member != NULL; member++) {
153: if (strcasecmp(user, *member) == 0) {
154: if (sysgroup_gr_delref)
155: sysgroup_gr_delref(grp);
156: return true;
157: }
158: }
159: if (sysgroup_gr_delref)
160: sysgroup_gr_delref(grp);
161: }
162:
163: return false;
164: }
165:
166: struct sudoers_group_plugin group_plugin = {
167: GROUP_API_VERSION,
168: sysgroup_init,
169: sysgroup_cleanup,
170: sysgroup_query
171: };
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>