Annotation of embedaddon/sudo/plugins/sudoers/group_plugin.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2010 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: #if defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD)
20:
21: #include <sys/types.h>
22: #include <sys/param.h>
23: #include <sys/stat.h>
24: #include <sys/time.h>
25: #include <stdio.h>
26: #ifdef STDC_HEADERS
27: # include <stdlib.h>
28: # include <stddef.h>
29: #else
30: # ifdef HAVE_STDLIB_H
31: # include <stdlib.h>
32: # endif
33: #endif /* STDC_HEADERS */
34: #ifdef HAVE_STRING_H
35: # include <string.h>
36: #endif /* HAVE_STRING_H */
37: #ifdef HAVE_STRINGS_H
38: # include <strings.h>
39: #endif /* HAVE_STRINGS_H */
40: #ifdef HAVE_UNISTD_H
41: # include <unistd.h>
42: #endif /* HAVE_UNISTD_H */
43: #if TIME_WITH_SYS_TIME
44: # include <time.h>
45: #endif
46: #ifdef HAVE_DLOPEN
47: # include <dlfcn.h>
48: #else
49: # include "compat/dlfcn.h"
50: #endif
51: #include <ctype.h>
52: #include <errno.h>
53: #include <pwd.h>
54:
55: #include "sudoers.h"
56:
57: #ifndef RTLD_GLOBAL
58: # define RTLD_GLOBAL 0
59: #endif
60:
61: static void *group_handle;
62: static struct sudoers_group_plugin *group_plugin;
63:
64: /*
65: * Load the specified plugin and run its init function.
66: * Returns -1 if unable to open the plugin, else it returns
67: * the value from the plugin's init function.
68: */
69: int
70: group_plugin_load(char *plugin_info)
71: {
72: struct stat sb;
73: char *args, path[PATH_MAX];
74: char **argv = NULL;
75: int len, rc = -1;
76:
77: /*
78: * Fill in .so path and split out args (if any).
79: */
80: if ((args = strpbrk(plugin_info, " \t")) != NULL) {
81: len = snprintf(path, sizeof(path), "%s%.*s",
82: (*plugin_info != '/') ? _PATH_SUDO_PLUGIN_DIR : "",
83: (int)(args - plugin_info), plugin_info);
84: args++;
85: } else {
86: len = snprintf(path, sizeof(path), "%s%s",
87: (*plugin_info != '/') ? _PATH_SUDO_PLUGIN_DIR : "", plugin_info);
88: }
89: if (len <= 0 || len >= sizeof(path)) {
90: warningx(_("%s%s: %s"),
91: (*plugin_info != '/') ? _PATH_SUDO_PLUGIN_DIR : "", plugin_info,
92: strerror(ENAMETOOLONG));
93: goto done;
94: }
95:
96: /* Sanity check plugin path. */
97: if (stat(path, &sb) != 0) {
98: warning("%s", path);
99: goto done;
100: }
101: if (sb.st_uid != ROOT_UID) {
102: warningx(_("%s must be owned by uid %d"), path, ROOT_UID);
103: goto done;
104: }
105: if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
106: warningx(_("%s must only be writable by owner"), path);
107: goto done;
108: }
109:
110: /* Open plugin and map in symbol. */
111: group_handle = dlopen(path, RTLD_LAZY|RTLD_GLOBAL);
112: if (!group_handle) {
113: warningx(_("unable to dlopen %s: %s"), path, dlerror());
114: goto done;
115: }
116: group_plugin = dlsym(group_handle, "group_plugin");
117: if (group_plugin == NULL) {
118: warningx(_("unable to find symbol \"group_plugin\" in %s"), path);
119: goto done;
120: }
121:
122: if (GROUP_API_VERSION_GET_MAJOR(group_plugin->version) != GROUP_API_VERSION_MAJOR) {
123: warningx(_("%s: incompatible group plugin major version %d, expected %d"),
124: path, GROUP_API_VERSION_GET_MAJOR(group_plugin->version),
125: GROUP_API_VERSION_MAJOR);
126: goto done;
127: }
128:
129: /*
130: * Split args into a vector if specified.
131: */
132: if (args != NULL) {
133: int ac = 0, wasblank = TRUE;
134: char *cp;
135:
136: for (cp = args; *cp != '\0'; cp++) {
137: if (isblank((unsigned char)*cp)) {
138: wasblank = TRUE;
139: } else if (wasblank) {
140: wasblank = FALSE;
141: ac++;
142: }
143: }
144: if (ac != 0) {
145: argv = emalloc2(ac, sizeof(char *));
146: ac = 0;
147: for ((cp = strtok(args, " \t")); cp; (cp = strtok(NULL, " \t")))
148: argv[ac++] = cp;
149: }
150: }
151:
152: rc = (group_plugin->init)(GROUP_API_VERSION, sudo_printf, argv);
153:
154: done:
155: efree(argv);
156:
157: if (rc != TRUE) {
158: if (group_handle != NULL) {
159: dlclose(group_handle);
160: group_handle = NULL;
161: group_plugin = NULL;
162: }
163: }
164:
165: return rc;
166: }
167:
168: void
169: group_plugin_unload(void)
170: {
171: if (group_plugin != NULL) {
172: (group_plugin->cleanup)();
173: group_plugin = NULL;
174: }
175: if (group_handle != NULL) {
176: dlclose(group_handle);
177: group_handle = NULL;
178: }
179: }
180:
181: int
182: group_plugin_query(const char *user, const char *group,
183: const struct passwd *pwd)
184: {
185: if (group_plugin == NULL)
186: return FALSE;
187: return (group_plugin->query)(user, group, pwd);
188: }
189:
190: #else /* !HAVE_DLOPEN && !HAVE_SHL_LOAD */
191:
192: /*
193: * No loadable shared object support.
194: */
195:
196: #ifndef FALSE
197: #define FALSE 0
198: #endif
199:
200: struct passwd;
201:
202: int
203: group_plugin_load(char *plugin_info)
204: {
205: return FALSE;
206: }
207:
208: void
209: group_plugin_unload(void)
210: {
211: return;
212: }
213:
214: int
215: group_plugin_query(const char *user, const char *group,
216: const struct passwd *pwd)
217: {
218: return FALSE;
219: }
220:
221: #endif /* HAVE_DLOPEN || HAVE_SHL_LOAD */
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