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 "error.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[4];
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: { NULL }
130: }
131: };
132:
133: /*
134: * "Set variable_name value"
135: */
136: static void
137: set_variable(const char *entry, const char *conf_file)
138: {
139: struct sudo_conf_table *var;
140:
141: for (var = sudo_conf_table_vars; var->name != NULL; var++) {
142: if (strncmp(entry, var->name, var->namelen) == 0 &&
143: isblank((unsigned char)entry[var->namelen])) {
144: entry += var->namelen + 1;
145: while (isblank((unsigned char)*entry))
146: entry++;
147: var->setter(entry, conf_file);
148: break;
149: }
150: }
151: }
152:
153: static void
154: set_var_disable_coredump(const char *entry, const char *conf_file)
155: {
156: int val = atobool(entry);
157:
158: if (val != -1)
159: sudo_conf_data.disable_coredump = val;
160: }
161:
162: static void
163: set_var_group_source(const char *entry, const char *conf_file)
164: {
165: if (strcasecmp(entry, "adaptive") == 0) {
166: sudo_conf_data.group_source = GROUP_SOURCE_ADAPTIVE;
167: } else if (strcasecmp(entry, "static") == 0) {
168: sudo_conf_data.group_source = GROUP_SOURCE_STATIC;
169: } else if (strcasecmp(entry, "dynamic") == 0) {
170: sudo_conf_data.group_source = GROUP_SOURCE_DYNAMIC;
171: } else {
172: warningx(_("unsupported group source `%s' in %s, line %d"), entry,
173: conf_file, conf_lineno);
174: }
175: }
176:
177: static void
178: set_var_max_groups(const char *entry, const char *conf_file)
179: {
180: long lval;
181: char *ep;
182:
183: lval = strtol(entry, &ep, 10);
184: if (*entry == '\0' || *ep != '\0' || lval < 0 || lval > INT_MAX ||
185: (errno == ERANGE && lval == LONG_MAX)) {
186: warningx(_("invalid max groups `%s' in %s, line %d"), entry,
187: conf_file, conf_lineno);
188: } else {
189: sudo_conf_data.max_groups = (int)lval;
190: }
191: }
192:
193: /*
194: * "Debug progname debug_file debug_flags"
195: */
196: static void
197: set_debug(const char *entry, const char *conf_file)
198: {
199: size_t filelen, proglen;
200: const char *progname;
201: char *debug_file, *debug_flags;
202:
203: /* Is this debug setting for me? */
204: progname = getprogname();
205: if (strcmp(progname, "sudoedit") == 0)
206: progname = "sudo";
207: proglen = strlen(progname);
208: if (strncmp(entry, progname, proglen) != 0 ||
209: !isblank((unsigned char)entry[proglen]))
210: return;
211: entry += proglen + 1;
212: while (isblank((unsigned char)*entry))
213: entry++;
214:
215: debug_flags = strpbrk(entry, " \t");
216: if (debug_flags == NULL)
217: return;
218: filelen = (size_t)(debug_flags - entry);
219: while (isblank((unsigned char)*debug_flags))
220: debug_flags++;
221:
222: /* Set debug file and parse the flags (init debug as soon as possible). */
223: debug_file = estrndup(entry, filelen);
224: debug_flags = estrdup(debug_flags);
225: sudo_debug_init(debug_file, debug_flags);
226: efree(debug_file);
227:
228: sudo_conf_data.debug_flags = debug_flags;
229: }
230:
231: static void
232: set_path(const char *entry, const char *conf_file)
233: {
234: const char *name, *path;
235: struct sudo_conf_paths *cur;
236:
237: /* Parse Path line */
238: name = entry;
239: path = strpbrk(entry, " \t");
240: if (path == NULL)
241: return;
242: while (isblank((unsigned char)*path))
243: path++;
244:
245: /* Match supported paths, ignore the rest. */
246: for (cur = sudo_conf_data.paths; cur->pname != NULL; cur++) {
247: if (strncasecmp(name, cur->pname, cur->pnamelen) == 0 &&
248: isblank((unsigned char)name[cur->pnamelen])) {
249: cur->pval = estrdup(path);
250: break;
251: }
252: }
253: }
254:
255: static void
256: set_plugin(const char *entry, const char *conf_file)
257: {
258: struct plugin_info *info;
259: const char *name, *path, *cp, *ep;
260: char **options = NULL;
261: size_t namelen, pathlen;
262: unsigned int nopts;
263:
264: /* Parse Plugin line */
265: name = entry;
266: path = strpbrk(entry, " \t");
267: if (path == NULL)
268: return;
269: namelen = (size_t)(path - name);
270: while (isblank((unsigned char)*path))
271: path++;
272: if ((cp = strpbrk(path, " \t")) != NULL) {
273: /* Convert any options to an array. */
274: pathlen = (size_t)(cp - path);
275: while (isblank((unsigned char)*cp))
276: cp++;
277: /* Count number of options and allocate array. */
278: for (ep = cp, nopts = 1; (ep = strpbrk(ep, " \t")) != NULL; nopts++) {
279: while (isblank((unsigned char)*ep))
280: ep++;
281: }
282: options = emalloc2(nopts + 1, sizeof(*options));
283: /* Fill in options array, there is at least one element. */
284: for (nopts = 0; (ep = strpbrk(cp, " \t")) != NULL; ) {
285: options[nopts++] = estrndup(cp, (size_t)(ep - cp));
286: while (isblank((unsigned char)*ep))
287: ep++;
288: cp = ep;
289: }
290: options[nopts++] = estrdup(cp);
291: options[nopts] = NULL;
292: } else {
293: /* No extra options. */
294: pathlen = strlen(path);
295: }
296:
297: info = ecalloc(1, sizeof(*info));
298: info->symbol_name = estrndup(name, namelen);
299: info->path = estrndup(path, pathlen);
300: info->options = options;
301: info->prev = info;
302: /* info->next = NULL; */
303: info->lineno = conf_lineno;
304: tq_append(&sudo_conf_data.plugins, info);
305: }
306:
307: const char *
308: sudo_conf_askpass_path(void)
309: {
310: return sudo_conf_data.paths[SUDO_CONF_ASKPASS_IDX].pval;
311: }
312:
313: const char *
314: sudo_conf_sesh_path(void)
315: {
316: return sudo_conf_data.paths[SUDO_CONF_SESH_IDX].pval;
317: }
318:
319: #ifdef _PATH_SUDO_NOEXEC
320: const char *
321: sudo_conf_noexec_path(void)
322: {
323: return sudo_conf_data.paths[SUDO_CONF_NOEXEC_IDX].pval;
324: }
325: #endif
326:
327: const char *
328: sudo_conf_debug_flags(void)
329: {
330: return sudo_conf_data.debug_flags;
331: }
332:
333: int
334: sudo_conf_group_source(void)
335: {
336: return sudo_conf_data.group_source;
337: }
338:
339: int
340: sudo_conf_max_groups(void)
341: {
342: return sudo_conf_data.max_groups;
343: }
344:
345: struct plugin_info_list *
346: sudo_conf_plugins(void)
347: {
348: return &sudo_conf_data.plugins;
349: }
350:
351: bool
352: sudo_conf_disable_coredump(void)
353: {
354: return sudo_conf_data.disable_coredump;
355: }
356:
357: /*
358: * Reads in /etc/sudo.conf and populates sudo_conf_data.
359: */
360: void
361: sudo_conf_read(const char *conf_file)
362: {
363: struct sudo_conf_table *cur;
364: struct stat sb;
365: FILE *fp;
366: char *cp, *line = NULL;
367: char *prev_locale = estrdup(setlocale(LC_ALL, NULL));
368: size_t linesize = 0;
369:
370: /* Parse sudo.conf in the "C" locale. */
371: if (prev_locale[0] != 'C' || prev_locale[1] != '\0')
372: setlocale(LC_ALL, "C");
373:
374: if (conf_file == NULL) {
375: conf_file = _PATH_SUDO_CONF;
376: switch (sudo_secure_file(conf_file, ROOT_UID, -1, &sb)) {
377: case SUDO_PATH_SECURE:
378: break;
379: case SUDO_PATH_MISSING:
380: /* Root should always be able to read sudo.conf. */
381: if (errno != ENOENT && geteuid() == ROOT_UID)
382: warning(_("unable to stat %s"), conf_file);
383: goto done;
384: case SUDO_PATH_BAD_TYPE:
385: warningx(_("%s is not a regular file"), conf_file);
386: goto done;
387: case SUDO_PATH_WRONG_OWNER:
388: warningx(_("%s is owned by uid %u, should be %u"),
389: conf_file, (unsigned int) sb.st_uid, ROOT_UID);
390: goto done;
391: case SUDO_PATH_WORLD_WRITABLE:
392: warningx(_("%s is world writable"), conf_file);
393: goto done;
394: case SUDO_PATH_GROUP_WRITABLE:
395: warningx(_("%s is group writable"), conf_file);
396: goto done;
397: default:
398: /* NOTREACHED */
399: goto done;
400: }
401: }
402:
403: if ((fp = fopen(conf_file, "r")) == NULL) {
404: if (errno != ENOENT && geteuid() == ROOT_UID)
405: warning(_("unable to open %s"), conf_file);
406: goto done;
407: }
408:
409: conf_lineno = 0;
410: while (sudo_parseln(&line, &linesize, &conf_lineno, fp) != -1) {
411: if (*(cp = line) == '\0')
412: continue; /* empty line or comment */
413:
414: for (cur = sudo_conf_table; cur->name != NULL; cur++) {
415: if (strncasecmp(cp, cur->name, cur->namelen) == 0 &&
416: isblank((unsigned char)cp[cur->namelen])) {
417: cp += cur->namelen;
418: while (isblank((unsigned char)*cp))
419: cp++;
420: cur->setter(cp, conf_file);
421: break;
422: }
423: }
424: }
425: fclose(fp);
426: free(line);
427: done:
428: /* Restore locale if needed. */
429: if (prev_locale[0] != 'C' || prev_locale[1] != '\0')
430: setlocale(LC_ALL, prev_locale);
431: efree(prev_locale);
432: }
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