aboutsummaryrefslogtreecommitdiff
path: root/runit/chpst.c
blob: 14b8b5a157ae59e680a606196bbda3ab5dd084df (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
/*
Copyright (c) 2001-2006, Gerrit Pape
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
   3. The name of the author may not be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
/* Dependencies on runit_lib.c removed */

#include "busybox.h"

#include <dirent.h>

// Must match constants in chpst_main!
#define OPT_verbose  (option_mask32 & 0x2000)
#define OPT_pgrp     (option_mask32 & 0x4000)
#define OPT_nostdin  (option_mask32 & 0x8000)
#define OPT_nostdout (option_mask32 & 0x10000)
#define OPT_nostderr (option_mask32 & 0x20000)

static char *set_user;
static char *env_user;
static const char *env_dir;
static long limitd = -2;
static long limits = -2;
static long limitl = -2;
static long limita = -2;
static long limito = -2;
static long limitp = -2;
static long limitf = -2;
static long limitc = -2;
static long limitr = -2;
static long limitt = -2;
static int nicelvl;
static const char *root;

static void suidgid(char *user)
{
	struct bb_uidgid_t ugid;

	if (!get_uidgid(&ugid, user, 1)) {
		bb_error_msg_and_die("unknown user/group: %s", user);
	}
	if (setgroups(1, &ugid.gid) == -1)
		bb_perror_msg_and_die("setgroups");
	xsetgid(ugid.gid);
	xsetuid(ugid.uid);
}

static void euidgid(char *user)
{
	struct bb_uidgid_t ugid;

	if (!get_uidgid(&ugid, user, 1)) {
		bb_error_msg_and_die("unknown user/group: %s", user);
	}
	xsetenv("GID", utoa(ugid.gid));
	xsetenv("UID", utoa(ugid.uid));
}

static void edir(const char *directory_name)
{
	int wdir;
	DIR *dir;
	struct dirent *d;
	int fd;

	wdir = xopen(".", O_RDONLY | O_NDELAY);
	xchdir(directory_name);
	dir = opendir(".");
	if (!dir)
		bb_perror_msg_and_die("opendir %s", directory_name);
	for (;;) {
		errno = 0;
		d = readdir(dir);
		if (!d) {
			if (errno)
				bb_perror_msg_and_die("readdir %s",
						directory_name);
			break;
		}
		if (d->d_name[0] == '.') continue;
		fd = open(d->d_name, O_RDONLY | O_NDELAY);
		if (fd < 0) {
			if ((errno == EISDIR) && env_dir) {
				if (OPT_verbose)
					bb_perror_msg("warning: %s/%s is a directory",
						directory_name,	d->d_name);
				continue;
			} else
				bb_perror_msg_and_die("open %s/%s",
						directory_name, d->d_name);
		}
		if (fd >= 0) {
			char buf[256];
			char *tail;
			int size;

			size = safe_read(fd, buf, sizeof(buf)-1);
			if (size < 0)
				bb_perror_msg_and_die("read %s/%s",
						directory_name, d->d_name);
			if (size == 0) {
				unsetenv(d->d_name);
				continue;
			}
			buf[size] = '\n';
			tail = memchr(buf, '\n', sizeof(buf));
			/* skip trailing whitespace */;
			while (1) {
				if (tail[0]==' ') tail[0] = '\0';
				if (tail[0]=='\t') tail[0] = '\0';
				if (tail[0]=='\n') tail[0] = '\0';
				if (tail == buf) break;
				tail--;
			}
			xsetenv(d->d_name, buf);
		}
	}
	closedir(dir);
	if (fchdir(wdir) == -1) bb_perror_msg_and_die("fchdir");
	close(wdir);
}

static void limit(int what, long l)
{
	struct rlimit r;

	if (getrlimit(what, &r) == -1) bb_perror_msg_and_die("getrlimit");
	if ((l < 0) || (l > r.rlim_max))
		r.rlim_cur = r.rlim_max;
	else
		r.rlim_cur = l;
	if (setrlimit(what, &r) == -1) bb_perror_msg_and_die("setrlimit");
}

static void slimit(void)
{
	if (limitd >= -1) {
#ifdef RLIMIT_DATA
		limit(RLIMIT_DATA, limitd);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_DATA");
#endif
	}
	if (limits >= -1) {
#ifdef RLIMIT_STACK
		limit(RLIMIT_STACK, limits);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_STACK");
#endif
	}
	if (limitl >= -1) {
#ifdef RLIMIT_MEMLOCK
		limit(RLIMIT_MEMLOCK, limitl);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_MEMLOCK");
#endif
	}
	if (limita >= -1) {
#ifdef RLIMIT_VMEM
		limit(RLIMIT_VMEM, limita);
#else
#ifdef RLIMIT_AS
		limit(RLIMIT_AS, limita);
#else
		if (OPT_verbose)
			bb_error_msg("system does not support %s",
				"RLIMIT_VMEM");
#endif
#endif
	}
	if (limito >= -1) {
#ifdef RLIMIT_NOFILE
		limit(RLIMIT_NOFILE, limito);
#else
#ifdef RLIMIT_OFILE
		limit(RLIMIT_OFILE, limito);
#else
		if (OPT_verbose)
			bb_error_msg("system does not support %s",
				"RLIMIT_NOFILE");
#endif
#endif
	}
	if (limitp >= -1) {
#ifdef RLIMIT_NPROC
		limit(RLIMIT_NPROC, limitp);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_NPROC");
#endif
	}
	if (limitf >= -1) {
#ifdef RLIMIT_FSIZE
		limit(RLIMIT_FSIZE, limitf);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_FSIZE");
#endif
	}
	if (limitc >= -1) {
#ifdef RLIMIT_CORE
		limit(RLIMIT_CORE, limitc);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_CORE");
#endif
	}
	if (limitr >= -1) {
#ifdef RLIMIT_RSS
		limit(RLIMIT_RSS, limitr);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_RSS");
#endif
	}
	if (limitt >= -1) {
#ifdef RLIMIT_CPU
		limit(RLIMIT_CPU, limitt);
#else
		if (OPT_verbose) bb_error_msg("system does not support %s",
				"RLIMIT_CPU");
#endif
	}
}

/* argv[0] */
static void setuidgid(int, char **);
static void envuidgid(int, char **);
static void envdir(int, char **);
static void softlimit(int, char **);

int chpst_main(int argc, char **argv)
{
	if (applet_name[3] == 'd') envdir(argc, argv);
	if (applet_name[1] == 'o') softlimit(argc, argv);
	if (applet_name[0] == 's') setuidgid(argc, argv);
	if (applet_name[0] == 'e') envuidgid(argc, argv);
	// otherwise we are chpst

	{
		char *m,*d,*o,*p,*f,*c,*r,*t,*n;
		getopt32(argc, argv, "+u:U:e:m:d:o:p:f:c:r:t:/:n:vP012",
				&set_user,&env_user,&env_dir,
				&m,&d,&o,&p,&f,&c,&r,&t,&root,&n);
		// if (option_mask32 & 0x1) // -u
		// if (option_mask32 & 0x2) // -U
		// if (option_mask32 & 0x4) // -e
		if (option_mask32 & 0x8) limits = limitl = limita = limitd = xatoul(m); // -m
		if (option_mask32 & 0x10) limitd = xatoul(d); // -d
		if (option_mask32 & 0x20) limito = xatoul(o); // -o
		if (option_mask32 & 0x40) limitp = xatoul(p); // -p
		if (option_mask32 & 0x80) limitf = xatoul(f); // -f
		if (option_mask32 & 0x100) limitc = xatoul(c); // -c
		if (option_mask32 & 0x200) limitr = xatoul(r); // -r
		if (option_mask32 & 0x400) limitt = xatoul(t); // -t
		// if (option_mask32 & 0x800) // -/
		if (option_mask32 & 0x1000) nicelvl = xatoi(n); // -n
		// The below consts should match #defines at top!
		//if (option_mask32 & 0x2000) OPT_verbose = 1; // -v
		//if (option_mask32 & 0x4000) OPT_pgrp = 1; // -P
		//if (option_mask32 & 0x8000) OPT_nostdin = 1; // -0
		//if (option_mask32 & 0x10000) OPT_nostdout = 1; // -1
		//if (option_mask32 & 0x20000) OPT_nostderr = 1; // -2
	}
	argv += optind;
	if (!argv || !*argv) bb_show_usage();
	
	if (OPT_pgrp) setsid();
	if (env_dir) edir(env_dir);
	if (root) {
		xchdir(root);
		if (chroot(".") == -1)
			bb_perror_msg_and_die("chroot");
	}
	slimit();
	if (nicelvl) {
		errno = 0;
		if (nice(nicelvl) == -1)
			bb_perror_msg_and_die("nice");
	}
	if (env_user) euidgid(env_user);
	if (set_user) suidgid(set_user);
	if (OPT_nostdin) close(0);
	if (OPT_nostdout) close(1);
	if (OPT_nostderr) close(2);
	execvp(argv[0], argv);
	bb_perror_msg_and_die("exec %s", argv[0]);
}

static void setuidgid(int argc, char **argv)
{
	const char *account;

	account = *++argv;
	if (!account) bb_show_usage();
	if (!*++argv) bb_show_usage();
	suidgid((char*)account);
	execvp(argv[0], argv);
	bb_perror_msg_and_die("exec %s", argv[0]);
}

static void envuidgid(int argc, char **argv)
{
	const char *account;

	account = *++argv;
	if (!account) bb_show_usage();
	if (!*++argv) bb_show_usage();
	euidgid((char*)account);
	execvp(argv[0], argv);
	bb_perror_msg_and_die("exec %s", argv[0]);
}

static void envdir(int argc, char **argv)
{
	const char *dir;

	dir = *++argv;
	if (!dir) bb_show_usage();
	if (!*++argv) bb_show_usage();
	edir(dir);
	execvp(argv[0], argv);
	bb_perror_msg_and_die("exec %s", argv[0]);
}

static void softlimit(int argc, char **argv)
{
	char *a,*c,*d,*f,*l,*m,*o,*p,*r,*s,*t;
	getopt32(argc, argv, "+a:c:d:f:l:m:o:p:r:s:t:",
			&a,&c,&d,&f,&l,&m,&o,&p,&r,&s,&t);
	if (option_mask32 & 0x001) limita = xatoul(a); // -a
	if (option_mask32 & 0x002) limitc = xatoul(c); // -c
	if (option_mask32 & 0x004) limitd = xatoul(d); // -d
	if (option_mask32 & 0x008) limitf = xatoul(f); // -f
	if (option_mask32 & 0x010) limitl = xatoul(l); // -l
	if (option_mask32 & 0x020) limits = limitl = limita = limitd = xatoul(m); // -m
	if (option_mask32 & 0x040) limito = xatoul(o); // -o
	if (option_mask32 & 0x080) limitp = xatoul(p); // -p
	if (option_mask32 & 0x100) limitr = xatoul(r); // -r
	if (option_mask32 & 0x200) limits = xatoul(s); // -s
	if (option_mask32 & 0x400) limitt = xatoul(t); // -t
	argv += optind;
	if (!argv[0]) bb_show_usage();
	slimit();
	execvp(argv[0], argv);
	bb_perror_msg_and_die("exec %s", argv[0]);
}