Annotation of embedaddon/sudo/src/load_plugins.c, revision 1.1.1.5
1.1 misho 1: /*
1.1.1.4 misho 2: * Copyright (c) 2009-2013 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: #include <stdio.h>
22: #ifdef STDC_HEADERS
23: # include <stdlib.h>
24: # include <stddef.h>
25: #else
26: # ifdef HAVE_STDLIB_H
27: # include <stdlib.h>
28: # endif
29: #endif /* STDC_HEADERS */
30: #ifdef HAVE_STRING_H
31: # include <string.h>
32: #endif /* HAVE_STRING_H */
33: #ifdef HAVE_STRINGS_H
34: # include <strings.h>
35: #endif /* HAVE_STRINGS_H */
36: #ifdef HAVE_UNISTD_H
37: # include <unistd.h>
38: #endif /* HAVE_UNISTD_H */
39: #include <errno.h>
40:
41: #include "sudo.h"
42: #include "sudo_plugin.h"
43: #include "sudo_plugin_int.h"
1.1.1.2 misho 44: #include "sudo_conf.h"
1.1.1.5 ! misho 45: #include "sudo_dso.h"
1.1.1.2 misho 46: #include "sudo_debug.h"
1.1 misho 47:
1.1.1.5 ! misho 48: /* We always use the same name for the sudoers plugin, regardless of the OS */
! 49: #define SUDOERS_PLUGIN "sudoers.so"
1.1.1.4 misho 50:
51: #ifdef _PATH_SUDO_PLUGIN_DIR
52: static int
53: sudo_stat_plugin(struct plugin_info *info, char *fullpath,
54: size_t pathsize, struct stat *sb)
1.1 misho 55: {
1.1.1.4 misho 56: int status = -1;
57: debug_decl(sudo_stat_plugin, SUDO_DEBUG_PLUGIN)
1.1 misho 58:
1.1.1.3 misho 59: if (info->path[0] == '/') {
1.1.1.4 misho 60: if (strlcpy(fullpath, info->path, pathsize) >= pathsize) {
1.1.1.5 ! misho 61: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 62: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 63: warningx(U_("%s: %s"), info->path, strerror(ENAMETOOLONG));
1.1 misho 64: goto done;
65: }
1.1.1.4 misho 66: status = stat(fullpath, sb);
1.1.1.3 misho 67: } else {
1.1.1.5 ! misho 68: int len;
! 69:
! 70: #ifdef STATIC_SUDOERS_PLUGIN
! 71: /* Check static symbols. */
! 72: if (strcmp(info->path, SUDOERS_PLUGIN) == 0) {
! 73: if (strlcpy(fullpath, info->path, pathsize) >= pathsize) {
! 74: warningx(U_("error in %s, line %d while loading plugin `%s'"),
! 75: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
! 76: warningx(U_("%s: %s"), info->path, strerror(ENAMETOOLONG));
! 77: goto done;
! 78: }
! 79: /* Plugin is static, fake up struct stat. */
! 80: memset(sb, 0, sizeof(*sb));
! 81: sb->st_uid = ROOT_UID;
! 82: sb->st_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
! 83: status = 0;
! 84: goto done;
! 85: }
! 86: #endif /* STATIC_SUDOERS_PLUGIN */
! 87:
! 88: len = snprintf(fullpath, pathsize, "%s%s", _PATH_SUDO_PLUGIN_DIR,
! 89: info->path);
! 90: if (len <= 0 || (size_t)len >= pathsize) {
! 91: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 92: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 93: warningx(U_("%s%s: %s"), _PATH_SUDO_PLUGIN_DIR, info->path,
1.1.1.3 misho 94: strerror(ENAMETOOLONG));
1.1 misho 95: goto done;
96: }
1.1.1.4 misho 97: /* Try parent dir for compatibility with old plugindir default. */
98: if ((status = stat(fullpath, sb)) != 0) {
99: char *cp = strrchr(fullpath, '/');
100: if (cp > fullpath + 4 && cp[-5] == '/' && cp[-4] == 's' &&
101: cp[-3] == 'u' && cp[-2] == 'd' && cp[-1] == 'o') {
102: int serrno = errno;
103: strlcpy(cp - 4, info->path, pathsize - (cp - 4 - fullpath));
104: if ((status = stat(fullpath, sb)) != 0)
105: errno = serrno;
106: }
107: }
108: # ifdef __hpux
109: /* Try .sl instead of .so on HP-UX for backwards compatibility. */
110: if (status != 0) {
111: size_t len = strlen(info->path);
112: if (len >= 3 && info->path[len - 3] == '.' &&
113: info->path[len - 2] == 's' && info->path[len - 1] == 'o') {
114: const char *sopath = info->path;
115: char *slpath = estrdup(info->path);
116: int serrno = errno;
117:
118: slpath[len - 1] = 'l';
119: info->path = slpath;
120: status = sudo_stat_plugin(info, fullpath, pathsize, sb);
121: if (status == 0) {
122: efree((void *)sopath);
123: } else {
124: efree(slpath);
125: info->path = sopath;
126: errno = serrno;
127: }
128: }
129: }
130: # endif /* __hpux */
1.1.1.3 misho 131: }
1.1.1.4 misho 132: done:
133: debug_return_int(status);
134: }
135:
136: static bool
137: sudo_check_plugin(struct plugin_info *info, char *fullpath, size_t pathsize)
138: {
139: struct stat sb;
140: int rval = false;
141: debug_decl(sudo_check_plugin, SUDO_DEBUG_PLUGIN)
142:
143: if (sudo_stat_plugin(info, fullpath, pathsize, &sb) != 0) {
1.1.1.5 ! misho 144: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 145: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
146: warning("%s%s", _PATH_SUDO_PLUGIN_DIR, info->path);
1.1.1.3 misho 147: goto done;
148: }
149: if (sb.st_uid != ROOT_UID) {
1.1.1.5 ! misho 150: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 151: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 152: warningx(U_("%s must be owned by uid %d"), fullpath, ROOT_UID);
1.1.1.3 misho 153: goto done;
154: }
155: if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
1.1.1.5 ! misho 156: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 157: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 158: warningx(U_("%s must be only be writable by owner"), fullpath);
1.1.1.3 misho 159: goto done;
160: }
1.1.1.4 misho 161: rval = true;
162:
163: done:
164: debug_return_bool(rval);
165: }
166: #else
167: static bool
168: sudo_check_plugin(struct plugin_info *info, char *fullpath, size_t pathsize)
169: {
170: debug_decl(sudo_check_plugin, SUDO_DEBUG_PLUGIN)
171: (void)strlcpy(fullpath, info->path, pathsize);
172: debug_return_bool(true);
173: }
174: #endif /* _PATH_SUDO_PLUGIN_DIR */
175:
176: /*
177: * Load the plugin specified by "info".
178: */
179: static bool
180: sudo_load_plugin(struct plugin_container *policy_plugin,
181: struct plugin_container_list *io_plugins, struct plugin_info *info)
182: {
183: struct plugin_container *container;
184: struct generic_plugin *plugin;
185: char path[PATH_MAX];
186: bool rval = false;
187: void *handle;
188: debug_decl(sudo_load_plugin, SUDO_DEBUG_PLUGIN)
189:
190: /* Sanity check plugin and fill in path */
191: if (!sudo_check_plugin(info, path, sizeof(path)))
192: goto done;
1.1 misho 193:
1.1.1.3 misho 194: /* Open plugin and map in symbol */
1.1.1.5 ! misho 195: handle = sudo_dso_load(path, SUDO_DSO_LAZY|SUDO_DSO_GLOBAL);
1.1.1.3 misho 196: if (!handle) {
1.1.1.5 ! misho 197: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 198: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 199: warningx(U_("unable to load %s: %s"), path, sudo_dso_strerror());
1.1.1.3 misho 200: goto done;
201: }
1.1.1.5 ! misho 202: plugin = sudo_dso_findsym(handle, info->symbol_name);
1.1.1.3 misho 203: if (!plugin) {
1.1.1.5 ! misho 204: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 205: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 206: warningx(U_("unable to find symbol `%s' in %s"), info->symbol_name, path);
1.1.1.3 misho 207: goto done;
208: }
1.1 misho 209:
1.1.1.3 misho 210: if (plugin->type != SUDO_POLICY_PLUGIN && plugin->type != SUDO_IO_PLUGIN) {
1.1.1.5 ! misho 211: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 212: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 213: warningx(U_("unknown policy type %d found in %s"), plugin->type, path);
1.1.1.3 misho 214: goto done;
215: }
216: if (SUDO_API_VERSION_GET_MAJOR(plugin->version) != SUDO_API_VERSION_MAJOR) {
1.1.1.5 ! misho 217: warningx(U_("error in %s, line %d while loading plugin `%s'"),
1.1.1.4 misho 218: _PATH_SUDO_CONF, info->lineno, info->symbol_name);
1.1.1.5 ! misho 219: warningx(U_("incompatible plugin major version %d (expected %d) found in %s"),
1.1.1.4 misho 220: SUDO_API_VERSION_GET_MAJOR(plugin->version),
221: SUDO_API_VERSION_MAJOR, path);
1.1.1.3 misho 222: goto done;
223: }
224: if (plugin->type == SUDO_POLICY_PLUGIN) {
225: if (policy_plugin->handle) {
1.1.1.4 misho 226: /* Ignore duplicate entries. */
227: if (strcmp(policy_plugin->name, info->symbol_name) != 0) {
1.1.1.5 ! misho 228: warningx(U_("ignoring policy plugin `%s' in %s, line %d"),
1.1.1.4 misho 229: info->symbol_name, _PATH_SUDO_CONF, info->lineno);
1.1.1.5 ! misho 230: warningx(U_("only a single policy plugin may be specified"));
1.1.1.4 misho 231: goto done;
232: }
1.1.1.5 ! misho 233: warningx(U_("ignoring duplicate policy plugin `%s' in %s, line %d"),
1.1.1.4 misho 234: info->symbol_name, _PATH_SUDO_CONF, info->lineno);
1.1.1.5 ! misho 235: sudo_dso_unload(handle);
1.1.1.4 misho 236: handle = NULL;
237: }
238: if (handle != NULL) {
239: policy_plugin->handle = handle;
240: policy_plugin->name = info->symbol_name;
241: policy_plugin->options = info->options;
242: policy_plugin->u.generic = plugin;
1.1.1.3 misho 243: }
244: } else if (plugin->type == SUDO_IO_PLUGIN) {
1.1.1.4 misho 245: /* Check for duplicate entries. */
1.1.1.5 ! misho 246: TAILQ_FOREACH(container, io_plugins, entries) {
1.1.1.4 misho 247: if (strcmp(container->name, info->symbol_name) == 0) {
1.1.1.5 ! misho 248: warningx(U_("ignoring duplicate I/O plugin `%s' in %s, line %d"),
1.1.1.4 misho 249: info->symbol_name, _PATH_SUDO_CONF, info->lineno);
1.1.1.5 ! misho 250: sudo_dso_unload(handle);
1.1.1.4 misho 251: handle = NULL;
252: break;
253: }
254: }
255: if (handle != NULL) {
256: container = ecalloc(1, sizeof(*container));
257: container->handle = handle;
258: container->name = info->symbol_name;
259: container->options = info->options;
260: container->u.generic = plugin;
1.1.1.5 ! misho 261: TAILQ_INSERT_TAIL(io_plugins, container, entries);
1.1.1.4 misho 262: }
1.1.1.3 misho 263: }
264:
265: rval = true;
266: done:
267: debug_return_bool(rval);
268: }
269:
270: /*
271: * Load the plugins listed in sudo.conf.
272: */
273: bool
274: sudo_load_plugins(struct plugin_container *policy_plugin,
275: struct plugin_container_list *io_plugins)
276: {
277: struct plugin_container *container;
278: struct plugin_info_list *plugins;
279: struct plugin_info *info;
280: bool rval = false;
281: debug_decl(sudo_load_plugins, SUDO_DEBUG_PLUGIN)
282:
283: /* Walk the plugin list from sudo.conf, if any. */
284: plugins = sudo_conf_plugins();
1.1.1.5 ! misho 285: TAILQ_FOREACH(info, plugins, entries) {
1.1.1.3 misho 286: rval = sudo_load_plugin(policy_plugin, io_plugins, info);
287: if (!rval)
1.1 misho 288: goto done;
289: }
1.1.1.3 misho 290:
291: /*
292: * If no policy plugin, fall back to the default (sudoers).
293: * If there is also no I/O log plugin, sudoers for that too.
294: */
1.1 misho 295: if (policy_plugin->handle == NULL) {
1.1.1.3 misho 296: /* Default policy plugin */
297: info = ecalloc(1, sizeof(*info));
298: info->symbol_name = "sudoers_policy";
299: info->path = SUDOERS_PLUGIN;
300: /* info->options = NULL; */
301: rval = sudo_load_plugin(policy_plugin, io_plugins, info);
302: efree(info);
303: if (!rval)
304: goto done;
305:
306: /* Default I/O plugin */
1.1.1.5 ! misho 307: if (TAILQ_EMPTY(io_plugins)) {
1.1.1.3 misho 308: info = ecalloc(1, sizeof(*info));
309: info->symbol_name = "sudoers_io";
310: info->path = SUDOERS_PLUGIN;
311: /* info->options = NULL; */
312: rval = sudo_load_plugin(policy_plugin, io_plugins, info);
313: efree(info);
314: if (!rval)
315: goto done;
316: }
1.1 misho 317: }
318: if (policy_plugin->u.policy->check_policy == NULL) {
1.1.1.5 ! misho 319: warningx(U_("policy plugin %s does not include a check_policy method"),
1.1 misho 320: policy_plugin->name);
1.1.1.3 misho 321: rval = false;
1.1 misho 322: goto done;
323: }
324:
1.1.1.2 misho 325: /* Install hooks (XXX - later). */
326: if (policy_plugin->u.policy->version >= SUDO_API_MKVERSION(1, 2)) {
327: if (policy_plugin->u.policy->register_hooks != NULL)
328: policy_plugin->u.policy->register_hooks(SUDO_HOOK_VERSION, register_hook);
1.1.1.3 misho 329: }
1.1.1.5 ! misho 330: TAILQ_FOREACH(container, io_plugins, entries) {
1.1.1.3 misho 331: if (container->u.io->version >= SUDO_API_MKVERSION(1, 2)) {
1.1.1.2 misho 332: if (container->u.io->register_hooks != NULL)
333: container->u.io->register_hooks(SUDO_HOOK_VERSION, register_hook);
334: }
335: }
336:
1.1 misho 337: done:
1.1.1.2 misho 338: debug_return_bool(rval);
1.1 misho 339: }
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