1: /*
2: * Copyright (c) 2009-2013 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/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_STDBOOL_H
31: # include <stdbool.h>
32: #else
33: # include "compat/stdbool.h"
34: #endif
35: #ifdef HAVE_STRING_H
36: # include <string.h>
37: #endif /* HAVE_STRING_H */
38: #ifdef HAVE_STRINGS_H
39: # include <strings.h>
40: #endif /* HAVE_STRINGS_H */
41: #ifdef HAVE_UNISTD_H
42: # include <unistd.h>
43: #endif /* HAVE_UNISTD_H */
44: #include <ctype.h>
45: #include <errno.h>
46: #include <limits.h>
47:
48: #define SUDO_ERROR_WRAP 0
49:
50: #include "missing.h"
51: #include "alloc.h"
52: #include "fatal.h"
53: #include "fileops.h"
54: #include "pathnames.h"
55: #include "sudo_plugin.h"
56: #include "sudo_conf.h"
57: #include "sudo_debug.h"
58: #include "secure_path.h"
59:
60: #define DEFAULT_TEXT_DOMAIN "sudo"
61: #include "gettext.h"
62:
63: #ifdef __TANDEM
64: # define ROOT_UID 65535
65: #else
66: # define ROOT_UID 0
67: #endif
68:
69: extern bool atobool(const char *str); /* atobool.c */
70:
71: struct sudo_conf_table {
72: const char *name;
73: unsigned int namelen;
74: void (*setter)(const char *entry, const char *conf_file);
75: };
76:
77: struct sudo_conf_paths {
78: const char *pname;
79: unsigned int pnamelen;
80: const char *pval;
81: };
82:
83: static void set_debug(const char *entry, const char *conf_file);
84: static void set_path(const char *entry, const char *conf_file);
85: static void set_plugin(const char *entry, const char *conf_file);
86: static void set_variable(const char *entry, const char *conf_file);
87: static void set_var_disable_coredump(const char *entry, const char *conf_file);
88: static void set_var_group_source(const char *entry, const char *conf_file);
89: static void set_var_max_groups(const char *entry, const char *conf_file);
90:
91: static unsigned int conf_lineno;
92:
93: static struct sudo_conf_table sudo_conf_table[] = {
94: { "Debug", sizeof("Debug") - 1, set_debug },
95: { "Path", sizeof("Path") - 1, set_path },
96: { "Plugin", sizeof("Plugin") - 1, set_plugin },
97: { "Set", sizeof("Set") - 1, set_variable },
98: { NULL }
99: };
100:
101: static struct sudo_conf_table sudo_conf_table_vars[] = {
102: { "disable_coredump", sizeof("disable_coredump") - 1, set_var_disable_coredump },
103: { "group_source", sizeof("group_source") - 1, set_var_group_source },
104: { "max_groups", sizeof("max_groups") - 1, set_var_max_groups },
105: { NULL }
106: };
107:
108: static struct sudo_conf_data {
109: bool disable_coredump;
110: int group_source;
111: int max_groups;
112: const char *debug_flags;
113: struct sudo_conf_paths paths[5];
114: struct plugin_info_list plugins;
115: } sudo_conf_data = {
116: true,
117: GROUP_SOURCE_ADAPTIVE,
118: -1,
119: NULL,
120: {
121: #define SUDO_CONF_ASKPASS_IDX 0
122: { "askpass", sizeof("askpass") - 1, _PATH_SUDO_ASKPASS },
123: #define SUDO_CONF_SESH_IDX 1
124: { "sesh", sizeof("sesh") - 1, _PATH_SUDO_SESH },
125: #ifdef _PATH_SUDO_NOEXEC
126: #define SUDO_CONF_NOEXEC_IDX 2
127: { "noexec", sizeof("noexec") - 1, _PATH_SUDO_NOEXEC },
128: #endif
129: #ifdef _PATH_SUDO_PLUGIN_DIR
130: #define SUDO_CONF_PLUGIN_IDX 3
131: { "plugin", sizeof("plugin") - 1, _PATH_SUDO_PLUGIN_DIR },
132: #endif
133: { NULL }
134: }
135: };
136:
137: /*
138: * "Set variable_name value"
139: */
140: static void
141: set_variable(const char *entry, const char *conf_file)
142: {
143: struct sudo_conf_table *var;
144:
145: for (var = sudo_conf_table_vars; var->name != NULL; var++) {
146: if (strncmp(entry, var->name, var->namelen) == 0 &&
147: isblank((unsigned char)entry[var->namelen])) {
148: entry += var->namelen + 1;
149: while (isblank((unsigned char)*entry))
150: entry++;
151: var->setter(entry, conf_file);
152: break;
153: }
154: }
155: }
156:
157: static void
158: set_var_disable_coredump(const char *entry, const char *conf_file)
159: {
160: int val = atobool(entry);
161:
162: if (val != -1)
163: sudo_conf_data.disable_coredump = val;
164: }
165:
166: static void
167: set_var_group_source(const char *entry, const char *conf_file)
168: {
169: if (strcasecmp(entry, "adaptive") == 0) {
170: sudo_conf_data.group_source = GROUP_SOURCE_ADAPTIVE;
171: } else if (strcasecmp(entry, "static") == 0) {
172: sudo_conf_data.group_source = GROUP_SOURCE_STATIC;
173: } else if (strcasecmp(entry, "dynamic") == 0) {
174: sudo_conf_data.group_source = GROUP_SOURCE_DYNAMIC;
175: } else {
176: warningx(_("unsupported group source `%s' in %s, line %d"), entry,
177: conf_file, conf_lineno);
178: }
179: }
180:
181: static void
182: set_var_max_groups(const char *entry, const char *conf_file)
183: {
184: long lval;
185: char *ep;
186:
187: lval = strtol(entry, &ep, 10);
188: if (*entry == '\0' || *ep != '\0' || lval <= 0 || lval > INT_MAX ||
189: (errno == ERANGE && lval == LONG_MAX)) {
190: warningx(_("invalid max groups `%s' in %s, line %d"), entry,
191: conf_file, conf_lineno);
192: } else {
193: sudo_conf_data.max_groups = (int)lval;
194: }
195: }
196:
197: /*
198: * "Debug progname debug_file debug_flags"
199: */
200: static void
201: set_debug(const char *entry, const char *conf_file)
202: {
203: size_t filelen, proglen;
204: const char *progname;
205: char *debug_file, *debug_flags;
206:
207: /* Is this debug setting for me? */
208: progname = getprogname();
209: if (strcmp(progname, "sudoedit") == 0)
210: progname = "sudo";
211: proglen = strlen(progname);
212: if (strncmp(entry, progname, proglen) != 0 ||
213: !isblank((unsigned char)entry[proglen]))
214: return;
215: entry += proglen + 1;
216: while (isblank((unsigned char)*entry))
217: entry++;
218:
219: debug_flags = strpbrk(entry, " \t");
220: if (debug_flags == NULL)
221: return;
222: filelen = (size_t)(debug_flags - entry);
223: while (isblank((unsigned char)*debug_flags))
224: debug_flags++;
225:
226: /* Set debug file and parse the flags (init debug as soon as possible). */
227: debug_file = estrndup(entry, filelen);
228: debug_flags = estrdup(debug_flags);
229: sudo_debug_init(debug_file, debug_flags);
230: efree(debug_file);
231:
232: sudo_conf_data.debug_flags = debug_flags;
233: }
234:
235: static void
236: set_path(const char *entry, const char *conf_file)
237: {
238: const char *name, *path;
239: struct sudo_conf_paths *cur;
240:
241: /* Parse Path line */
242: name = entry;
243: path = strpbrk(entry, " \t");
244: if (path == NULL)
245: return;
246: while (isblank((unsigned char)*path))
247: path++;
248:
249: /* Match supported paths, ignore the rest. */
250: for (cur = sudo_conf_data.paths; cur->pname != NULL; cur++) {
251: if (strncasecmp(name, cur->pname, cur->pnamelen) == 0 &&
252: isblank((unsigned char)name[cur->pnamelen])) {
253: cur->pval = estrdup(path);
254: break;
255: }
256: }
257: }
258:
259: static void
260: set_plugin(const char *entry, const char *conf_file)
261: {
262: struct plugin_info *info;
263: const char *name, *path, *cp, *ep;
264: char **options = NULL;
265: size_t namelen, pathlen;
266: unsigned int nopts;
267:
268: /* Parse Plugin line */
269: name = entry;
270: path = strpbrk(entry, " \t");
271: if (path == NULL)
272: return;
273: namelen = (size_t)(path - name);
274: while (isblank((unsigned char)*path))
275: path++;
276: if ((cp = strpbrk(path, " \t")) != NULL) {
277: /* Convert any options to an array. */
278: pathlen = (size_t)(cp - path);
279: while (isblank((unsigned char)*cp))
280: cp++;
281: /* Count number of options and allocate array. */
282: for (ep = cp, nopts = 1; (ep = strpbrk(ep, " \t")) != NULL; nopts++) {
283: while (isblank((unsigned char)*ep))
284: ep++;
285: }
286: options = emalloc2(nopts + 1, sizeof(*options));
287: /* Fill in options array, there is at least one element. */
288: for (nopts = 0; (ep = strpbrk(cp, " \t")) != NULL; ) {
289: options[nopts++] = estrndup(cp, (size_t)(ep - cp));
290: while (isblank((unsigned char)*ep))
291: ep++;
292: cp = ep;
293: }
294: options[nopts++] = estrdup(cp);
295: options[nopts] = NULL;
296: } else {
297: /* No extra options. */
298: pathlen = strlen(path);
299: }
300:
301: info = ecalloc(1, sizeof(*info));
302: info->symbol_name = estrndup(name, namelen);
303: info->path = estrndup(path, pathlen);
304: info->options = options;
305: info->prev = info;
306: /* info->next = NULL; */
307: info->lineno = conf_lineno;
308: tq_append(&sudo_conf_data.plugins, info);
309: }
310:
311: const char *
312: sudo_conf_askpass_path(void)
313: {
314: return sudo_conf_data.paths[SUDO_CONF_ASKPASS_IDX].pval;
315: }
316:
317: const char *
318: sudo_conf_sesh_path(void)
319: {
320: return sudo_conf_data.paths[SUDO_CONF_SESH_IDX].pval;
321: }
322:
323: #ifdef _PATH_SUDO_NOEXEC
324: const char *
325: sudo_conf_noexec_path(void)
326: {
327: return sudo_conf_data.paths[SUDO_CONF_NOEXEC_IDX].pval;
328: }
329: #endif
330:
331: #ifdef _PATH_SUDO_PLUGIN_DIR
332: const char *
333: sudo_conf_plugin_dir_path(void)
334: {
335: return sudo_conf_data.paths[SUDO_CONF_PLUGIN_IDX].pval;
336: }
337: #endif
338:
339: const char *
340: sudo_conf_debug_flags(void)
341: {
342: return sudo_conf_data.debug_flags;
343: }
344:
345: int
346: sudo_conf_group_source(void)
347: {
348: return sudo_conf_data.group_source;
349: }
350:
351: int
352: sudo_conf_max_groups(void)
353: {
354: return sudo_conf_data.max_groups;
355: }
356:
357: struct plugin_info_list *
358: sudo_conf_plugins(void)
359: {
360: return &sudo_conf_data.plugins;
361: }
362:
363: bool
364: sudo_conf_disable_coredump(void)
365: {
366: return sudo_conf_data.disable_coredump;
367: }
368:
369: /*
370: * Reads in /etc/sudo.conf and populates sudo_conf_data.
371: */
372: void
373: sudo_conf_read(const char *conf_file)
374: {
375: struct sudo_conf_table *cur;
376: struct stat sb;
377: FILE *fp;
378: char *cp, *line = NULL;
379: char *prev_locale = estrdup(setlocale(LC_ALL, NULL));
380: size_t linesize = 0;
381:
382: /* Parse sudo.conf in the "C" locale. */
383: if (prev_locale[0] != 'C' || prev_locale[1] != '\0')
384: setlocale(LC_ALL, "C");
385:
386: if (conf_file == NULL) {
387: conf_file = _PATH_SUDO_CONF;
388: switch (sudo_secure_file(conf_file, ROOT_UID, -1, &sb)) {
389: case SUDO_PATH_SECURE:
390: break;
391: case SUDO_PATH_MISSING:
392: /* Root should always be able to read sudo.conf. */
393: if (errno != ENOENT && geteuid() == ROOT_UID)
394: warning(_("unable to stat %s"), conf_file);
395: goto done;
396: case SUDO_PATH_BAD_TYPE:
397: warningx(_("%s is not a regular file"), conf_file);
398: goto done;
399: case SUDO_PATH_WRONG_OWNER:
400: warningx(_("%s is owned by uid %u, should be %u"),
401: conf_file, (unsigned int) sb.st_uid, ROOT_UID);
402: goto done;
403: case SUDO_PATH_WORLD_WRITABLE:
404: warningx(_("%s is world writable"), conf_file);
405: goto done;
406: case SUDO_PATH_GROUP_WRITABLE:
407: warningx(_("%s is group writable"), conf_file);
408: goto done;
409: default:
410: /* NOTREACHED */
411: goto done;
412: }
413: }
414:
415: if ((fp = fopen(conf_file, "r")) == NULL) {
416: if (errno != ENOENT && geteuid() == ROOT_UID)
417: warning(_("unable to open %s"), conf_file);
418: goto done;
419: }
420:
421: conf_lineno = 0;
422: while (sudo_parseln(&line, &linesize, &conf_lineno, fp) != -1) {
423: if (*(cp = line) == '\0')
424: continue; /* empty line or comment */
425:
426: for (cur = sudo_conf_table; cur->name != NULL; cur++) {
427: if (strncasecmp(cp, cur->name, cur->namelen) == 0 &&
428: isblank((unsigned char)cp[cur->namelen])) {
429: cp += cur->namelen;
430: while (isblank((unsigned char)*cp))
431: cp++;
432: cur->setter(cp, conf_file);
433: break;
434: }
435: }
436: }
437: fclose(fp);
438: free(line);
439: done:
440: /* Restore locale if needed. */
441: if (prev_locale[0] != 'C' || prev_locale[1] != '\0')
442: setlocale(LC_ALL, prev_locale);
443: efree(prev_locale);
444: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to sudo_conf.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / sudo / common