summaryrefslogtreecommitdiffstats
path: root/src/statoverride/main.c
blob: 07c8757111fc9f93ddbdf63f4fea72f87ff3347d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
/*
 * dpkg-statoverride - override ownership and mode of files
 *
 * Copyright © 2000, 2001 Wichert Akkerman <wakkerma@debian.org>
 * Copyright © 2006-2015 Guillem Jover <guillem@debian.org>
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

#include <config.h>
#include <compat.h>

#include <sys/types.h>
#include <sys/stat.h>

#include <errno.h>
#if HAVE_LOCALE_H
#include <locale.h>
#endif
#include <string.h>
#include <grp.h>
#include <pwd.h>
#include <fnmatch.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/debug.h>
#include <dpkg/string.h>
#include <dpkg/path.h>
#include <dpkg/dir.h>
#include <dpkg/glob.h>
#include <dpkg/db-fsys.h>
#include <dpkg/options.h>

#include "force.h"
#include "actions.h"
#include "security-mac.h"

static const char printforhelp[] = N_(
"Use --help for help about overriding file stat information.");

static int
printversion(const char *const *argv)
{
	printf(_("Debian %s version %s.\n"), dpkg_get_progname(),
	       PACKAGE_RELEASE);

	printf(_(
"This is free software; see the GNU General Public License version 2 or\n"
"later for copying conditions. There is NO warranty.\n"));

	m_output(stdout, _("<standard output>"));

	return 0;
}

static int
usage(const char *const *argv)
{
	printf(_(
"Usage: %s [<option> ...] <command>\n"
"\n"), dpkg_get_progname());

	printf(_(
"Commands:\n"
"  --add <owner> <group> <mode> <path>\n"
"                           add a new <path> entry into the database.\n"
"  --remove <path>          remove <path> from the database.\n"
"  --list [<glob-pattern>]  list current overrides in the database.\n"
"\n"));

	printf(_(
"Options:\n"
"  --admindir <directory>   set the directory with the statoverride file.\n"
"  --instdir <directory>    set the root directory, but not the admin dir.\n"
"  --root <directory>       set the directory of the root filesystem.\n"
"  --update                 immediately update <path> permissions.\n"
"  --force                  deprecated alias for --force-all.\n"
"  --force-<thing>[,...]    override problems (see --force-help).\n"
"  --no-force-<thing>[,...] stop when problems encountered.\n"
"  --refuse-<thing>[,...]   ditto.\n"
"  --quiet                  quiet operation, minimal output.\n"
"  --help                   show this help message.\n"
"  --version                show the version.\n"
"\n"));

	m_output(stdout, _("<standard output>"));

	return 0;
}

#define FORCE_STATCMD_MASK \
	FORCE_NON_ROOT | \
	FORCE_SECURITY_MAC | FORCE_STATOVERRIDE_ADD | FORCE_STATOVERRIDE_DEL

static int opt_verbose = 1;
static int opt_update = 0;

static char *
path_cleanup(const char *path)
{
	char *new_path = m_strdup(path);

	path_trim_slash_slashdot(new_path);
	if (opt_verbose && strcmp(path, new_path) != 0)
		warning(_("stripping trailing /"));

	return new_path;
}

static struct file_stat *
statdb_node_new(const char *user, const char *group, const char *mode)
{
	struct file_stat *filestat;

	filestat = nfmalloc(sizeof(*filestat));

	filestat->uid = statdb_parse_uid(user);
	if (filestat->uid == (uid_t)-1)
		ohshit(_("user '%s' does not exist"), user);
	filestat->uname = NULL;
	filestat->gid = statdb_parse_gid(group);
	if (filestat->gid == (gid_t)-1)
		ohshit(_("group '%s' does not exist"), group);
	filestat->gname = NULL;
	filestat->mode = statdb_parse_mode(mode);

	return filestat;
}

static struct file_stat **
statdb_node_find(const char *filename)
{
	struct fsys_namenode *file;

	file = fsys_hash_find_node(filename, FHFF_NONE);

	return &file->statoverride;
}

static int
statdb_node_remove(const char *filename)
{
	struct fsys_namenode *file;

	file = fsys_hash_find_node(filename, FHFF_NO_NEW);
	if (!file || !file->statoverride)
		return 0;

	file->statoverride = NULL;

	return 1;
}

static void
statdb_node_apply(const char *filename, struct file_stat *filestat)
{
	int rc;

	rc = chown(filename, filestat->uid, filestat->gid);
	if (forcible_nonroot_error(rc) < 0)
		ohshite(_("error setting ownership of '%.255s'"), filename);
	rc = chmod(filename, filestat->mode & ~S_IFMT);
	if (forcible_nonroot_error(rc) < 0)
		ohshite(_("error setting permissions of '%.255s'"), filename);

	dpkg_selabel_load();
	dpkg_selabel_set_context(filename, filename, filestat->mode);
	dpkg_selabel_close();
}

static void
statdb_node_print(FILE *out, struct fsys_namenode *file)
{
	struct file_stat *filestat = file->statoverride;
	struct passwd *pw;
	struct group *gr;

	if (!filestat)
		return;

	pw = getpwuid(filestat->uid);
	if (pw)
		fprintf(out, "%s ", pw->pw_name);
	else if (filestat->uname)
		fprintf(out, "%s ", filestat->uname);
	else
		fprintf(out, "#%d ", filestat->uid);

	gr = getgrgid(filestat->gid);
	if (gr)
		fprintf(out, "%s ", gr->gr_name);
	else if (filestat->gname)
		fprintf(out, "%s ", filestat->gname);
	else
		fprintf(out, "#%d ", filestat->gid);

	fprintf(out, "%o %s\n", filestat->mode & ~S_IFMT, file->name);
}

static void
statdb_write(void)
{
	char *dbname;
	struct atomic_file *dbfile;
	struct fsys_hash_iter *iter;
	struct fsys_namenode *file;

	dbname = dpkg_db_get_path(STATOVERRIDEFILE);
	dbfile = atomic_file_new(dbname, ATOMIC_FILE_BACKUP);
	atomic_file_open(dbfile);

	iter = fsys_hash_iter_new();
	while ((file = fsys_hash_iter_next(iter)))
		statdb_node_print(dbfile->fp, file);
	fsys_hash_iter_free(iter);

	atomic_file_sync(dbfile);
	atomic_file_close(dbfile);
	atomic_file_commit(dbfile);
	atomic_file_free(dbfile);

	dir_sync_path(dpkg_db_get_dir());

	free(dbname);
}

static int
statoverride_add(const char *const *argv)
{
	const char *user = argv[0];
	const char *group = argv[1];
	const char *mode = argv[2];
	const char *path = argv[3];
	char *filename;
	struct file_stat **filestat;

	if (!user || !group || !mode || !path || argv[4])
		badusage(_("--%s needs four arguments"), cipaction->olong);

	if (strchr(path, '\n'))
		badusage(_("path may not contain newlines"));

	ensure_statoverrides(STATDB_PARSE_LAX);

	filename = path_cleanup(path);

	filestat = statdb_node_find(filename);
	if (*filestat != NULL) {
		if (in_force(FORCE_STATOVERRIDE_ADD))
			warning(_("an override for '%s' already exists, "
			          "but --force specified so will be ignored"),
			        filename);
		else
			ohshit(_("an override for '%s' already exists; "
			         "aborting"), filename);
	}

	*filestat = statdb_node_new(user, group, mode);

	if (opt_update) {
		struct stat st;
		struct varbuf realfilename = VARBUF_INIT;

		varbuf_add_str(&realfilename, dpkg_fsys_get_dir());
		varbuf_add_str(&realfilename, filename);
		varbuf_end_str(&realfilename);

		if (stat(realfilename.buf, &st) == 0) {
			(*filestat)->mode |= st.st_mode & S_IFMT;
			statdb_node_apply(realfilename.buf, *filestat);
		} else if (opt_verbose) {
			warning(_("--update given but %s does not exist"),
			        realfilename.buf);
		}

		varbuf_destroy(&realfilename);
	}

	statdb_write();

	free(filename);

	return 0;
}

static int
statoverride_remove(const char *const *argv)
{
	const char *path = argv[0];
	char *filename;

	if (!path || argv[1])
		badusage(_("--%s needs a single argument"), "remove");

	ensure_statoverrides(STATDB_PARSE_LAX);

	filename = path_cleanup(path);

	if (!statdb_node_remove(filename)) {
		if (opt_verbose)
			warning(_("no override present"));
		if (in_force(FORCE_STATOVERRIDE_DEL))
			return 0;
		else
			return 2;
	}

	if (opt_update && opt_verbose)
		warning(_("--update is useless for --remove"));

	statdb_write();

	free(filename);

	return 0;
}

static int
statoverride_list(const char *const *argv)
{
	struct fsys_hash_iter *iter;
	struct fsys_namenode *file;
	const char *thisarg;
	struct glob_node *glob_list = NULL;
	int ret = 1;

	ensure_statoverrides(STATDB_PARSE_LAX);

	while ((thisarg = *argv++)) {
		char *pattern = path_cleanup(thisarg);

		glob_list_prepend(&glob_list, pattern);
	}
	if (glob_list == NULL)
		glob_list_prepend(&glob_list, m_strdup("*"));

	iter = fsys_hash_iter_new();
	while ((file = fsys_hash_iter_next(iter))) {
		struct glob_node *g;

		for (g = glob_list; g; g = g->next) {
			if (fnmatch(g->pattern, file->name, 0) == 0) {
				statdb_node_print(stdout, file);
				ret = 0;
				break;
			}
		}
	}
	fsys_hash_iter_free(iter);

	glob_list_free(glob_list);

	return ret;
}

static void
set_force_obsolete(const struct cmdinfo *cip, const char *value)
{
	warning(_("deprecated --%s option; use --%s instead"),
	        cip->olong, "force-all");
	set_force(FORCE_ALL);
}

static const struct cmdinfo cmdinfos[] = {
	ACTION("add",    0, act_install,   statoverride_add),
	ACTION("remove", 0, act_remove,    statoverride_remove),
	ACTION("list",   0, act_listfiles, statoverride_list),
	ACTION("help",   '?', act_help,    usage),
	ACTION("version", 0,  act_version, printversion),

	{ "admindir",   0,   1,  NULL,         NULL,      set_admindir, 0 },
	{ "instdir",    0,   1,  NULL,         NULL,      set_instdir,  0 },
	{ "root",       0,   1,  NULL,         NULL,      set_root,     0 },
	{ "quiet",      0,   0,  &opt_verbose, NULL,      NULL, 0       },
	{ "force",      0,   0,  NULL,         NULL,      set_force_obsolete },
	{ "force",      0,   2,  NULL,         NULL,      set_force_option, 1 },
	{ "no-force",   0,   2,  NULL,         NULL,      set_force_option, 0 },
	{ "refuse",     0,   2,  NULL,         NULL,      set_force_option, 0 },
	{ "update",     0,   0,  &opt_update,  NULL,      NULL, 1       },
	{  NULL,        0                                               }
};

int
main(int argc, const char *const *argv)
{
	int ret;

	dpkg_locales_init(PACKAGE);
	dpkg_program_init("dpkg-statoverride");
	set_force_default(FORCE_STATCMD_MASK);
	dpkg_options_parse(&argv, cmdinfos, printforhelp);

	debug(dbg_general, "root=%s admindir=%s", dpkg_fsys_get_dir(), dpkg_db_get_dir());

	if (!cipaction)
		badusage(_("need an action option"));

	ret = cipaction->action(argv);

	dpkg_program_done();
	dpkg_locales_done();

	return ret;
}