/[path-sandbox]/trunk/src/sandbox.c
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Revision 141 - (show annotations) (download) (as text)
Thu Jul 7 22:08:17 2005 UTC (9 years, 3 months ago) by azarah
Original Path: trunk/sandbox.c
File MIME type: text/x-csrc
File size: 14790 byte(s)
Remove sandbox_dir and co - we are not using it anymore.
1 /*
2 ** Path sandbox for the gentoo linux portage package system, initially
3 ** based on the ROCK Linux Wrapper for getting a list of created files
4 **
5 ** to integrate with bash, bash should have been built like this
6 **
7 ** ./configure --prefix=<prefix> --host=<host> --without-gnu-malloc
8 **
9 ** it's very important that the --enable-static-link option is NOT specified
10 **
11 ** Copyright (C) 2001 Geert Bevin, Uwyn, http://www.uwyn.com
12 ** Distributed under the terms of the GNU General Public License, v2 or later
13 ** Author : Geert Bevin <gbevin@uwyn.com>
14 ** $Header$
15 */
16
17 /* #define _GNU_SOURCE */
18
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <signal.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <limits.h>
25 #include <string.h>
26 #include <sys/file.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/types.h>
30 #include <sys/resource.h>
31 #include <sys/wait.h>
32 #include <unistd.h>
33 #include <fcntl.h>
34 #include "sandbox.h"
35
36 struct sandbox_info_t {
37 char sandbox_log[SB_PATH_MAX];
38 char sandbox_debug_log[SB_PATH_MAX];
39 char sandbox_lib[SB_PATH_MAX];
40 char sandbox_rc[SB_PATH_MAX];
41 char portage_tmp_dir[SB_PATH_MAX];
42 char var_tmp_dir[SB_PATH_MAX];
43 char tmp_dir[SB_PATH_MAX];
44 char *home_dir;
45 } sandbox_info_t;
46
47 static char *tmp_dir;
48
49 static int print_debug = 0;
50 static int stop_called = 0;
51
52 int sandbox_setup(struct sandbox_info_t *sandbox_info)
53 {
54 if (NULL == realpath(getenv(ENV_PORTAGE_TMPDIR) ? getenv(ENV_PORTAGE_TMPDIR)
55 : PORTAGE_TMPDIR,
56 sandbox_info->portage_tmp_dir)) {
57 perror(">>> get portage_tmp_dir");
58 return -1;
59 }
60 setenv(ENV_PORTAGE_TMPDIR, sandbox_info->portage_tmp_dir, 1);
61
62 if (NULL == realpath(VAR_TMPDIR, sandbox_info->var_tmp_dir)) {
63 perror(">>> get var_tmp_dir");
64 return -1;
65 }
66
67 if (-1 == get_tmp_dir(sandbox_info->tmp_dir)) {
68 perror(">>> get tmp_dir");
69 return -1;
70 }
71 tmp_dir = sandbox_info->tmp_dir;
72 setenv(ENV_TMPDIR, tmp_dir, 1);
73
74 sandbox_info->home_dir = getenv("HOME");
75 if (!sandbox_info->home_dir) {
76 sandbox_info->home_dir = tmp_dir;
77 setenv("HOME", sandbox_info->home_dir, 1);
78 }
79
80 /* Generate sandbox lib path */
81 get_sandbox_lib(sandbox_info->sandbox_lib);
82
83 /* Generate sandbox bashrc path */
84 get_sandbox_rc(sandbox_info->sandbox_rc);
85
86 /* Generate sandbox log full path */
87 get_sandbox_log(sandbox_info->sandbox_log);
88
89 /* Generate sandbox debug log full path */
90 get_sandbox_debug_log(sandbox_info->sandbox_debug_log);
91
92 return 0;
93 }
94
95 int print_sandbox_log(char *sandbox_log)
96 {
97 int sandbox_log_file = -1;
98 char *beep_count_env = NULL;
99 int i, color, beep_count = 0;
100 long len = 0;
101 char *buffer = NULL;
102
103 if (1 != is_file(sandbox_log)) {
104 perror(">>> log file not a regular file");
105 return 0;
106 }
107
108 sandbox_log_file = open(sandbox_log, O_RDONLY);
109 if (-1 == sandbox_log_file) {
110 perror(">>> could not open log file");
111 return 0;
112 }
113
114 len = file_length(sandbox_log_file);
115 buffer = (char *)malloc((len + 1) * sizeof(char));
116 memset(buffer, 0, len + 1);
117 read(sandbox_log_file, buffer, len);
118 close(sandbox_log_file);
119
120 color = ((getenv("NOCOLOR") != NULL) ? 0 : 1);
121
122 if (color)
123 printf("\e[31;01m");
124 printf("--------------------------- ACCESS VIOLATION SUMMARY ---------------------------");
125 if (color)
126 printf("\033[0m");
127 if (color)
128 printf("\e[31;01m");
129 printf("\nLOG FILE = \"%s\"", sandbox_log);
130 if (color)
131 printf("\033[0m");
132 printf("\n\n");
133 printf("%s", buffer);
134 if (buffer)
135 free(buffer);
136 buffer = NULL;
137 printf("\e[31;01m--------------------------------------------------------------------------------\033[0m\n");
138
139 beep_count_env = getenv(ENV_SANDBOX_BEEP);
140 if (beep_count_env)
141 beep_count = atoi(beep_count_env);
142 else
143 beep_count = DEFAULT_BEEP_COUNT;
144
145 for (i = 0; i < beep_count; i++) {
146 fputc('\a', stderr);
147 if (i < beep_count - 1)
148 sleep(1);
149 }
150
151 return 1;
152 }
153
154 void stop(int signum)
155 {
156 if (stop_called == 0) {
157 stop_called = 1;
158 printf("Caught signal %d in pid %d\r\n", signum, getpid());
159 } else {
160 fprintf(stderr, "Pid %d alreadly caught signal and is still cleaning up\n", getpid());
161 }
162 }
163
164 void get_sandbox_write_envvar(char *buf, struct sandbox_info_t *sandbox_info)
165 {
166 /* bzero out entire buffer then append trailing 0 */
167 memset(buf, 0, SB_BUF_LEN);
168
169 /* these could go into make.globals later on */
170 snprintf(buf, SB_BUF_LEN,
171 "%s:%s/.gconfd/lock:%s/.bash_history:%s:%s:%s:%s",
172 "/dev/zero:/dev/null:/dev/fd:/proc/self/fd:/dev/pts/:"
173 "/dev/vc/:/dev/pty:/dev/tty:/dev/console:"
174 "/dev/shm/ngpt:/var/log/scrollkeeper.log:"
175 "/usr/tmp/conftest:/usr/lib/conftest:"
176 "/usr/lib32/conftest:/usr/lib64/conftest:"
177 "/usr/tmp/cf:/usr/lib/cf:/usr/lib32/cf:/usr/lib64/cf",
178 sandbox_info->home_dir, sandbox_info->home_dir,
179 (NULL != sandbox_info->portage_tmp_dir) ? sandbox_info->portage_tmp_dir : tmp_dir,
180 sandbox_info->tmp_dir, sandbox_info->var_tmp_dir,
181 "/tmp/:/var/tmp/");
182 }
183
184 void get_sandbox_predict_envvar(char *buf, struct sandbox_info_t *sandbox_info)
185 {
186 /* bzero out entire buffer then append trailing 0 */
187 memset(buf, 0, SB_BUF_LEN);
188
189 /* these should go into make.globals later on */
190 snprintf(buf, SB_BUF_LEN, "%s/.:"
191 "/usr/lib/python2.0/:"
192 "/usr/lib/python2.1/:"
193 "/usr/lib/python2.2/:"
194 "/usr/lib/python2.3/:"
195 "/usr/lib/python2.4/:"
196 "/usr/lib/python2.5/:"
197 "/usr/lib/python3.0/:"
198 "/var/db/aliases.db:"
199 "/var/db/netgroup.db:"
200 "/var/db/netmasks.db:"
201 "/var/db/ethers.db:"
202 "/var/db/rpc.db:"
203 "/var/db/protocols.db:"
204 "/var/db/services.db:"
205 "/var/db/networks.db:"
206 "/var/db/hosts.db:"
207 "/var/db/group.db:"
208 "/var/db/passwd.db",
209 sandbox_info->home_dir);
210 }
211
212 int sandbox_setenv(char **env, const char *name, const char *val) {
213 char **tmp_env = env;
214 char *tmp_string = NULL;
215
216 /* XXX: We add the new variable to the end (no replacing). If this
217 * is changed, we need to fix sandbox_setup_environ() below */
218 while (NULL != *tmp_env)
219 tmp_env++;
220
221 /* strlen(name) + strlen(val) + '=' + '\0' */
222 /* FIXME: Should probably free this at some stage - more neatness than
223 * a real leak that will cause issues. */
224 tmp_string = calloc(strlen(name) + strlen(val) + 2, sizeof(char *));
225 if (NULL == tmp_string) {
226 perror(">>> out of memory (sandbox_setenv)");
227 exit(1);
228 }
229
230 snprintf(tmp_string, strlen(name) + strlen(val) + 2, "%s=%s",
231 name, val);
232 *tmp_env = tmp_string;
233
234 return 0;
235 }
236
237 /* We setup the environment child side only to prevent issues with
238 * setting LD_PRELOAD parent side */
239 char **sandbox_setup_environ(struct sandbox_info_t *sandbox_info)
240 {
241 int env_size = 0;
242 int have_ld_preload = 0;
243
244 char **new_environ;
245 char **env_ptr = environ;
246 char sandbox_write_envvar[SB_BUF_LEN];
247 char sandbox_predict_envvar[SB_BUF_LEN];
248 char *ld_preload_envvar = NULL;
249 char *orig_ld_preload_envvar = NULL;
250
251 /* Unset these, as its easier than replacing when setting up our
252 * new environment below */
253 unsetenv(ENV_SANDBOX_LIB);
254 unsetenv(ENV_SANDBOX_BASHRC);
255 unsetenv(ENV_SANDBOX_LOG);
256 unsetenv(ENV_SANDBOX_DEBUG_LOG);
257
258 if (NULL != getenv(ENV_LD_PRELOAD)) {
259 have_ld_preload = 1;
260 orig_ld_preload_envvar = getenv(ENV_LD_PRELOAD);
261
262 /* FIXME: Should probably free this at some stage - more neatness
263 * than a real leak that will cause issues. */
264 ld_preload_envvar = calloc(strlen(orig_ld_preload_envvar) +
265 strlen(sandbox_info->sandbox_lib) + 2,
266 sizeof(char *));
267 if (NULL == ld_preload_envvar)
268 return NULL;
269 snprintf(ld_preload_envvar, strlen(orig_ld_preload_envvar) +
270 strlen(sandbox_info->sandbox_lib) + 2, "%s %s",
271 sandbox_info->sandbox_lib, orig_ld_preload_envvar);
272 } else {
273 /* FIXME: Should probably free this at some stage - more neatness
274 * than a real leak that will cause issues. */
275 ld_preload_envvar = strndup(sandbox_info->sandbox_lib,
276 strlen(sandbox_info->sandbox_lib));
277 if (NULL == ld_preload_envvar)
278 return NULL;
279 }
280 /* Do not unset this, as strange things might happen */
281 /* unsetenv(ENV_LD_PRELOAD); */
282
283 while (NULL != *env_ptr) {
284 env_size++;
285 env_ptr++;
286 }
287
288 /* FIXME: Should probably free this at some stage - more neatness than
289 * a real leak that will cause issues. */
290 new_environ = calloc((env_size + 15 + 1) * sizeof(char *), sizeof(char *));
291 if (NULL == new_environ)
292 return NULL;
293
294 /* First add our new variables to the beginning - this is due to some
295 * weirdness that I cannot remember */
296 sandbox_setenv(new_environ, ENV_SANDBOX_LIB, sandbox_info->sandbox_lib);
297 sandbox_setenv(new_environ, ENV_SANDBOX_BASHRC, sandbox_info->sandbox_rc);
298 sandbox_setenv(new_environ, ENV_SANDBOX_LOG, sandbox_info->sandbox_log);
299 sandbox_setenv(new_environ, ENV_SANDBOX_DEBUG_LOG,
300 sandbox_info->sandbox_debug_log);
301 /* If LD_PRELOAD was not set, set it here, else do it below */
302 if (1 != have_ld_preload)
303 sandbox_setenv(new_environ, ENV_LD_PRELOAD, ld_preload_envvar);
304
305 if (!getenv(ENV_SANDBOX_DENY))
306 sandbox_setenv(new_environ, ENV_SANDBOX_DENY, LD_PRELOAD_FILE);
307
308 if (!getenv(ENV_SANDBOX_READ))
309 sandbox_setenv(new_environ, ENV_SANDBOX_READ, "/");
310
311 get_sandbox_write_envvar(sandbox_write_envvar, sandbox_info);
312 if (!getenv(ENV_SANDBOX_WRITE))
313 sandbox_setenv(new_environ, ENV_SANDBOX_WRITE, sandbox_write_envvar);
314
315 get_sandbox_predict_envvar(sandbox_predict_envvar, sandbox_info);
316 if (!getenv(ENV_SANDBOX_PREDICT))
317 sandbox_setenv(new_environ, ENV_SANDBOX_PREDICT, sandbox_predict_envvar);
318
319 /* This one should NEVER be set in ebuilds, as it is the one
320 * private thing libsandbox.so use to test if the sandbox
321 * should be active for this pid, or not.
322 *
323 * azarah (3 Aug 2002)
324 */
325
326 sandbox_setenv(new_environ, "SANDBOX_ACTIVE", "armedandready");
327
328 env_size = 0;
329 while (NULL != new_environ[env_size])
330 env_size++;
331
332 /* Now add the rest */
333 env_ptr = environ;
334 while (NULL != *env_ptr) {
335 if ((1 == have_ld_preload) &&
336 (strstr(*env_ptr, LD_PRELOAD_EQ) == *env_ptr))
337 /* If LD_PRELOAD was set, and this is it in the original
338 * environment, replace it with our new copy */
339 /* XXX: The following works as it just add whatever as
340 * the last variable to nev_environ */
341 sandbox_setenv(new_environ, ENV_LD_PRELOAD,
342 ld_preload_envvar);
343 else
344 new_environ[env_size + (env_ptr - environ)] = *env_ptr;
345 env_ptr++;
346 }
347
348 return new_environ;
349 }
350
351 int spawn_shell(char *argv_bash[], char *env[])
352 {
353 int pid;
354 int status = 0;
355 int ret = 0;
356
357 pid = fork();
358
359 /* Child's process */
360 if (0 == pid) {
361 execve(argv_bash[0], argv_bash, env);
362 return 0;
363 } else if (pid < 0) {
364 return 0;
365 }
366 ret = waitpid(pid, &status, 0);
367 if ((-1 == ret) || (status > 0))
368 return 0;
369
370 return 1;
371 }
372
373 int main(int argc, char **argv)
374 {
375 int i = 0, success = 1;
376 int sandbox_log_presence = 0;
377 long len;
378
379 struct sandbox_info_t sandbox_info;
380
381 char **sandbox_environ;
382 char **argv_bash = NULL;
383
384 char *run_str = "-c";
385
386 /* Only print info if called with no arguments .... */
387 if (argc < 2)
388 print_debug = 1;
389
390 if (print_debug)
391 printf("========================== Gentoo linux path sandbox ===========================\n");
392
393 /* check if a sandbox is already running */
394 if (NULL != getenv(ENV_SANDBOX_ON)) {
395 fprintf(stderr, "Not launching a new sandbox instance\n");
396 fprintf(stderr, "Another one is already running in this process hierarchy.\n");
397 exit(1);
398 } else {
399
400 /* determine the location of all the sandbox support files */
401 if (print_debug)
402 printf("Detection of the support files.\n");
403
404 if (-1 == sandbox_setup(&sandbox_info)) {
405 perror(">>> setup");
406 exit(1);
407 }
408
409 /* verify the existance of required files */
410 if (print_debug)
411 printf("Verification of the required files.\n");
412
413 #ifndef SB_HAVE_64BIT_ARCH
414 if (0 >= exists(sandbox_info.sandbox_lib)) {
415 fprintf(stderr, "Could not open the sandbox library at '%s'.\n",
416 sandbox_info.sandbox_lib);
417 return -1;
418 }
419 #endif
420 if (0 >= exists(sandbox_info.sandbox_rc)) {
421 fprintf(stderr, "Could not open the sandbox rc file at '%s'.\n",
422 sandbox_info.sandbox_rc);
423 return -1;
424 }
425
426 /* set up the required environment variables */
427 if (print_debug)
428 printf("Setting up the required environment variables.\n");
429
430 /* This one should not be child only, as we check above to see
431 * if we are already running (check sandbox_setup_environ).
432 * This needs to be set before calling sandbox_setup_environ(),
433 * else its not set for the child */
434 setenv(ENV_SANDBOX_ON, "1", 0);
435
436 /* Setup the child environment stuff */
437 sandbox_environ = sandbox_setup_environ(&sandbox_info);
438 if (NULL == sandbox_environ) {
439 perror(">>> out of memory (environ)");
440 exit(1);
441 }
442
443 /* if the portage temp dir was present, cd into it */
444 if (NULL != sandbox_info.portage_tmp_dir)
445 chdir(sandbox_info.portage_tmp_dir);
446
447 argv_bash = (char **)malloc(6 * sizeof(char *));
448 argv_bash[0] = strdup("/bin/bash");
449 argv_bash[1] = strdup("-rcfile");
450 argv_bash[2] = strdup(sandbox_info.sandbox_rc);
451
452 if (argc < 2)
453 argv_bash[3] = NULL;
454 else
455 argv_bash[3] = strdup(run_str); /* "-c" */
456
457 argv_bash[4] = NULL; /* strdup(run_arg); */
458 argv_bash[5] = NULL;
459
460 if (argc >= 2) {
461 for (i = 1; i < argc; i++) {
462 if (NULL == argv_bash[4])
463 len = 0;
464 else
465 len = strlen(argv_bash[4]);
466
467 argv_bash[4] = (char *)realloc(argv_bash[4],
468 (len + strlen(argv[i]) + 2) * sizeof(char));
469
470 if (0 == len)
471 argv_bash[4][0] = 0;
472 if (1 != i)
473 strcat(argv_bash[4], " ");
474
475 strcat(argv_bash[4], argv[i]);
476 }
477 }
478
479 /* set up the required signal handlers */
480 signal(SIGHUP, &stop);
481 signal(SIGINT, &stop);
482 signal(SIGQUIT, &stop);
483 signal(SIGTERM, &stop);
484
485 /* STARTING PROTECTED ENVIRONMENT */
486 if (print_debug) {
487 printf("The protected environment has been started.\n");
488 printf("--------------------------------------------------------------------------------\n");
489 }
490
491 if (print_debug)
492 printf("Shell being started in forked process.\n");
493
494 /* Start Bash */
495 if (!spawn_shell(argv_bash, sandbox_environ)) {
496 if (print_debug)
497 fprintf(stderr, ">>> shell process failed to spawn\n");
498 success = 0;
499 }
500
501 /* Free bash stuff */
502 for (i = 0; i < 6; i++) {
503 if (argv_bash[i])
504 free(argv_bash[i]);
505 argv_bash[i] = NULL;
506 }
507 if (argv_bash)
508 free(argv_bash);
509 argv_bash = NULL;
510
511 if (print_debug)
512 printf("Cleaning up sandbox process\n");
513
514 if (print_debug) {
515 printf("========================== Gentoo linux path sandbox ===========================\n");
516 printf("The protected environment has been shut down.\n");
517 }
518
519 if (1 == exists(sandbox_info.sandbox_log)) {
520 sandbox_log_presence = 1;
521 print_sandbox_log(sandbox_info.sandbox_log);
522 } else if (print_debug) {
523 printf("--------------------------------------------------------------------------------\n");
524 }
525
526 if ((sandbox_log_presence) || (!success))
527 return 1;
528 else
529 return 0;
530 }
531 }
532
533 // vim:noexpandtab noai:cindent ai

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