| 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 |
int preload_adaptable = 1; |
| 37 |
int cleaned_up = 0; |
| 38 |
int print_debug = 0; |
| 39 |
int stop_called = 0; |
| 40 |
|
| 41 |
/* Read pids file, and load active pids into an array. Return number of pids in array */ |
| 42 |
int |
| 43 |
load_active_pids(int fd, int **pids) |
| 44 |
{ |
| 45 |
char *data = NULL; |
| 46 |
char *ptr = NULL, *ptr2 = NULL; |
| 47 |
int my_pid; |
| 48 |
int num_pids = 0; |
| 49 |
long len; |
| 50 |
|
| 51 |
pids[0] = NULL; |
| 52 |
|
| 53 |
len = file_length(fd); |
| 54 |
|
| 55 |
/* Allocate and zero datablock to read pids file */ |
| 56 |
data = (char *) malloc((len + 1) * sizeof (char)); |
| 57 |
memset(data, 0, len + 1); |
| 58 |
|
| 59 |
/* Start at beginning of file */ |
| 60 |
lseek(fd, 0L, SEEK_SET); |
| 61 |
|
| 62 |
/* read entire file into a buffer */ |
| 63 |
read(fd, data, len); |
| 64 |
|
| 65 |
ptr = data; |
| 66 |
|
| 67 |
/* Loop and read all pids */ |
| 68 |
while (1) { |
| 69 |
/* Find new line */ |
| 70 |
ptr2 = strchr(ptr, '\n'); |
| 71 |
if (ptr2 == NULL) |
| 72 |
break; /* No more PIDs */ |
| 73 |
|
| 74 |
/* Clear the \n. And ptr should have a null-terminated decimal string */ |
| 75 |
ptr2[0] = 0; |
| 76 |
|
| 77 |
my_pid = atoi(ptr); |
| 78 |
|
| 79 |
/* If the PID is still alive, add it to our array */ |
| 80 |
if ((0 != my_pid) && (0 == kill(my_pid, 0))) { |
| 81 |
pids[0] = (int *) realloc(pids[0], (num_pids + 1) * sizeof (int)); |
| 82 |
pids[0][num_pids] = my_pid; |
| 83 |
num_pids++; |
| 84 |
} |
| 85 |
|
| 86 |
/* Put ptr past the NULL we just wrote */ |
| 87 |
ptr = ptr2 + 1; |
| 88 |
} |
| 89 |
|
| 90 |
if (data) |
| 91 |
free(data); |
| 92 |
data = NULL; |
| 93 |
|
| 94 |
return num_pids; |
| 95 |
} |
| 96 |
|
| 97 |
/* Read ld.so.preload file, and loads dirs into an array. Return number of entries in array */ |
| 98 |
int |
| 99 |
load_preload_libs(int fd, char ***preloads) |
| 100 |
{ |
| 101 |
char *data = NULL; |
| 102 |
char *ptr = NULL, *ptr2 = NULL; |
| 103 |
int num_entries = 0; |
| 104 |
long len; |
| 105 |
|
| 106 |
preloads[0] = NULL; |
| 107 |
|
| 108 |
len = file_length(fd); |
| 109 |
|
| 110 |
/* Allocate and zero datablock to read pids file */ |
| 111 |
data = (char *) malloc((len + 1) * sizeof (char)); |
| 112 |
memset(data, 0, len + 1); |
| 113 |
|
| 114 |
/* Start at beginning of file */ |
| 115 |
lseek(fd, 0L, SEEK_SET); |
| 116 |
|
| 117 |
/* read entire file into a buffer */ |
| 118 |
read(fd, data, len); |
| 119 |
|
| 120 |
ptr = data; |
| 121 |
|
| 122 |
/* Loop and read all pids */ |
| 123 |
while (1) { |
| 124 |
/* Find new line */ |
| 125 |
ptr2 = strchr(ptr, '\n'); |
| 126 |
|
| 127 |
/* Clear the \n. And ptr should have a null-terminated decimal string |
| 128 |
* Don't break from the loop though because the last line may not |
| 129 |
* terminated with a \n |
| 130 |
*/ |
| 131 |
if (NULL != ptr2) |
| 132 |
ptr2[0] = 0; |
| 133 |
|
| 134 |
/* If listing does not match our libname, add it to the array */ |
| 135 |
if ((strlen(ptr)) && (NULL == strstr(ptr, LIB_NAME))) { |
| 136 |
preloads[0] = |
| 137 |
(char **) realloc(preloads[0], (num_entries + 1) * sizeof (char **)); |
| 138 |
preloads[0][num_entries] = strdup(ptr); |
| 139 |
num_entries++; |
| 140 |
} |
| 141 |
|
| 142 |
if (NULL == ptr2) |
| 143 |
break; /* No more PIDs */ |
| 144 |
|
| 145 |
/* Put ptr past the NULL we just wrote */ |
| 146 |
ptr = ptr2 + 1; |
| 147 |
} |
| 148 |
|
| 149 |
if (data) |
| 150 |
free(data); |
| 151 |
data = NULL; |
| 152 |
|
| 153 |
return num_entries; |
| 154 |
} |
| 155 |
|
| 156 |
void |
| 157 |
cleanup() |
| 158 |
{ |
| 159 |
int i = 0; |
| 160 |
int success = 1; |
| 161 |
int pids_file = -1, num_of_pids = 0; |
| 162 |
int *pids_array = NULL; |
| 163 |
char pid_string[255]; |
| 164 |
char *sandbox_pids_file; |
| 165 |
#ifdef USE_LD_SO_PRELOAD |
| 166 |
int preload_file = -1, num_of_preloads = 0; |
| 167 |
char preload_entry[255]; |
| 168 |
char **preload_array = NULL; |
| 169 |
#endif |
| 170 |
|
| 171 |
/* Generate sandbox pids-file path */ |
| 172 |
sandbox_pids_file = get_sandbox_pids_file(); |
| 173 |
|
| 174 |
/* Remove this sandbox's bash pid from the global pids |
| 175 |
* file if it has rights to adapt the ld.so.preload file */ |
| 176 |
if ((1 == preload_adaptable) && (0 == cleaned_up)) { |
| 177 |
cleaned_up = 1; |
| 178 |
success = 1; |
| 179 |
|
| 180 |
if (print_debug) |
| 181 |
printf("Cleaning up pids file.\n"); |
| 182 |
|
| 183 |
/* Stat the PIDs file, make sure it exists and is a regular file */ |
| 184 |
if (file_exist(sandbox_pids_file, 1) <= 0) { |
| 185 |
fprintf(stderr, ">>> pids file is not a regular file"); |
| 186 |
success = 0; |
| 187 |
/* We should really not fail if the pidsfile is missing here, but |
| 188 |
* rather just exit cleanly, as there is still some cleanup to do */ |
| 189 |
return; |
| 190 |
} |
| 191 |
|
| 192 |
pids_file = file_open(sandbox_pids_file, "r+", 1, 0664, "portage"); |
| 193 |
if (-1 == pids_file) { |
| 194 |
success = 0; |
| 195 |
/* Nothing more to do here */ |
| 196 |
return; |
| 197 |
} |
| 198 |
|
| 199 |
/* Load "still active" pids into an array */ |
| 200 |
num_of_pids = load_active_pids(pids_file, &pids_array); |
| 201 |
//printf("pids: %d\r\n", num_of_pids); |
| 202 |
|
| 203 |
#ifdef USE_LD_SO_PRELOAD |
| 204 |
/* clean the /etc/ld.so.preload file if no other sandbox |
| 205 |
* processes are running anymore */ |
| 206 |
if (1 == num_of_pids) { |
| 207 |
success = 1; |
| 208 |
|
| 209 |
if (print_debug) |
| 210 |
printf("Cleaning up /etc/ld.so.preload.\n"); |
| 211 |
|
| 212 |
preload_file = file_open("/etc/ld.so.preload", "r+", 1, 0644); |
| 213 |
if (-1 != preload_file) { |
| 214 |
/* Load all the preload libraries into an array */ |
| 215 |
num_of_preloads = load_preload_libs(preload_file, &preload_array); |
| 216 |
//printf("num preloads: %d\r\n", num_of_preloads); |
| 217 |
/* Clear file */ |
| 218 |
file_truncate(preload_file); |
| 219 |
|
| 220 |
/* store the other preload libraries back into the /etc/ld.so.preload file */ |
| 221 |
if (num_of_preloads > 0) { |
| 222 |
for (i = 0; i < num_of_preloads; i++) { |
| 223 |
sprintf(preload_entry, "%s\n", preload_array[i]); |
| 224 |
if (write |
| 225 |
(preload_file, |
| 226 |
preload_entry, |
| 227 |
strlen(preload_entry)) != strlen(preload_entry)) { |
| 228 |
perror(">>> /etc/ld.so.preload file write"); |
| 229 |
success = 0; |
| 230 |
break; |
| 231 |
} |
| 232 |
} |
| 233 |
} |
| 234 |
|
| 235 |
/* Free memory used to store preload array */ |
| 236 |
for (i = 0; i < num_of_preloads; i++) { |
| 237 |
if (preload_array[i]) |
| 238 |
free(preload_array[i]); |
| 239 |
preload_array[i] = NULL; |
| 240 |
} |
| 241 |
if (preload_array) |
| 242 |
free(preload_array); |
| 243 |
preload_array = NULL; |
| 244 |
|
| 245 |
file_close(preload_file); |
| 246 |
preload_file = -1; |
| 247 |
} |
| 248 |
} |
| 249 |
#endif |
| 250 |
|
| 251 |
file_truncate(pids_file); |
| 252 |
|
| 253 |
/* if pids are still running, write only the running pids back to the file */ |
| 254 |
if (num_of_pids > 1) { |
| 255 |
for (i = 0; i < num_of_pids; i++) { |
| 256 |
if (pids_array[i] != getpid()) { |
| 257 |
sprintf(pid_string, "%d\n", pids_array[i]); |
| 258 |
|
| 259 |
if (write(pids_file, pid_string, strlen(pid_string)) != |
| 260 |
strlen(pid_string)) { |
| 261 |
perror(">>> pids file write"); |
| 262 |
success = 0; |
| 263 |
break; |
| 264 |
} |
| 265 |
} |
| 266 |
} |
| 267 |
|
| 268 |
file_close(pids_file); |
| 269 |
pids_file = -1; |
| 270 |
} else { |
| 271 |
|
| 272 |
file_close(pids_file); |
| 273 |
pids_file = -1; |
| 274 |
|
| 275 |
/* remove the pidsfile, as this was the last sandbox */ |
| 276 |
unlink(sandbox_pids_file); |
| 277 |
} |
| 278 |
|
| 279 |
if (pids_array != NULL) |
| 280 |
free(pids_array); |
| 281 |
pids_array = NULL; |
| 282 |
} |
| 283 |
|
| 284 |
free(sandbox_pids_file); |
| 285 |
if (0 == success) |
| 286 |
return; |
| 287 |
} |
| 288 |
|
| 289 |
void |
| 290 |
stop(int signum) |
| 291 |
{ |
| 292 |
if (stop_called == 0) { |
| 293 |
stop_called = 1; |
| 294 |
printf("Caught signal %d in pid %d\r\n", signum, getpid()); |
| 295 |
cleanup(); |
| 296 |
} else { |
| 297 |
fprintf(stderr, "Pid %d alreadly caught signal and is still cleaning up\n", getpid()); |
| 298 |
} |
| 299 |
} |
| 300 |
|
| 301 |
void |
| 302 |
setenv_sandbox_write(char *home_dir, char *portage_tmp_dir, char *var_tmp_dir, |
| 303 |
char *tmp_dir) |
| 304 |
{ |
| 305 |
char buf[1024]; |
| 306 |
|
| 307 |
/* bzero out entire buffer then append trailing 0 */ |
| 308 |
memset(buf, 0, sizeof(buf)); |
| 309 |
|
| 310 |
if (!getenv(ENV_SANDBOX_WRITE)) { |
| 311 |
/* these could go into make.globals later on */ |
| 312 |
snprintf(buf, sizeof(buf), |
| 313 |
"%s:%s/.gconfd/lock:%s/.bash_history:", \ |
| 314 |
"/dev/zero:/dev/fd/:/dev/null:/dev/pts/:" \ |
| 315 |
"/dev/vc/:/dev/tty:/tmp/:" \ |
| 316 |
"/dev/shm/ngpt:/var/log/scrollkeeper.log:" \ |
| 317 |
"/usr/tmp/conftest:/usr/lib/conftest:" \ |
| 318 |
"/usr/lib32/conftest:/usr/lib64/conftest:" \ |
| 319 |
"/usr/tmp/cf:/usr/lib/cf:/usr/lib32/cf:/usr/lib64/cf", |
| 320 |
home_dir, home_dir); |
| 321 |
|
| 322 |
if (NULL == portage_tmp_dir) { |
| 323 |
strncat(buf, tmp_dir, sizeof(buf)); |
| 324 |
strncat(buf, ":", sizeof(buf)); |
| 325 |
strncat(buf, var_tmp_dir, sizeof(buf)); |
| 326 |
strncat(buf, ":/tmp/:/var/tmp/", sizeof(buf)); |
| 327 |
} else { |
| 328 |
strncat(buf, portage_tmp_dir, sizeof(buf)); |
| 329 |
strncat(buf, ":", sizeof(buf)); |
| 330 |
strncat(buf, tmp_dir, sizeof(buf)); |
| 331 |
strncat(buf, ":", sizeof(buf)); |
| 332 |
strncat(buf, var_tmp_dir, sizeof(buf)); |
| 333 |
strncat(buf, ":/tmp/:/var/tmp/", sizeof(buf)); |
| 334 |
} |
| 335 |
buf[sizeof(buf) - 1] = '\0'; |
| 336 |
setenv(ENV_SANDBOX_WRITE, buf, 1); |
| 337 |
} |
| 338 |
} |
| 339 |
|
| 340 |
void |
| 341 |
setenv_sandbox_predict(char *home_dir) |
| 342 |
{ |
| 343 |
char buf[1024]; |
| 344 |
|
| 345 |
memset(buf, 0, sizeof(buf)); |
| 346 |
|
| 347 |
if (!getenv(ENV_SANDBOX_PREDICT)) { |
| 348 |
/* these should go into make.globals later on */ |
| 349 |
snprintf(buf, sizeof(buf), "%s/.:" \ |
| 350 |
"/usr/lib/python2.0/:" \ |
| 351 |
"/usr/lib/python2.1/:" \ |
| 352 |
"/usr/lib/python2.2/:" \ |
| 353 |
"/usr/lib/python2.3/:" \ |
| 354 |
"/usr/lib/python2.4/:" \ |
| 355 |
"/usr/lib/python2.5/:" \ |
| 356 |
"/usr/lib/python3.0/:", |
| 357 |
home_dir); |
| 358 |
|
| 359 |
buf[sizeof(buf) - 1] = '\0'; |
| 360 |
setenv(ENV_SANDBOX_PREDICT, buf, 1); |
| 361 |
} |
| 362 |
} |
| 363 |
|
| 364 |
int |
| 365 |
print_sandbox_log(char *sandbox_log) |
| 366 |
{ |
| 367 |
int sandbox_log_file = -1; |
| 368 |
char *beep_count_env = NULL; |
| 369 |
int i, color, beep_count = 0; |
| 370 |
long len = 0; |
| 371 |
char *buffer = NULL; |
| 372 |
|
| 373 |
sandbox_log_file = file_open(sandbox_log, "r", 1, 0664, "portage"); |
| 374 |
if (-1 == sandbox_log_file) |
| 375 |
return 0; |
| 376 |
|
| 377 |
len = file_length(sandbox_log_file); |
| 378 |
buffer = (char *) malloc((len + 1) * sizeof (char)); |
| 379 |
memset(buffer, 0, len + 1); |
| 380 |
read(sandbox_log_file, buffer, len); |
| 381 |
file_close(sandbox_log_file); |
| 382 |
|
| 383 |
color = ( (getenv("NOCOLOR") != NULL) ? 0 : 1); |
| 384 |
|
| 385 |
if (color) printf("\e[31;01m"); |
| 386 |
printf("--------------------------- ACCESS VIOLATION SUMMARY ---------------------------"); |
| 387 |
if (color) printf("\033[0m"); |
| 388 |
if (color) printf("\e[31;01m"); |
| 389 |
printf("\nLOG FILE = \"%s\"", sandbox_log); |
| 390 |
if (color) printf("\033[0m"); |
| 391 |
printf("\n\n"); |
| 392 |
printf("%s", buffer); |
| 393 |
if (buffer) |
| 394 |
free(buffer); |
| 395 |
buffer = NULL; |
| 396 |
printf |
| 397 |
("\e[31;01m--------------------------------------------------------------------------------\033[0m\n"); |
| 398 |
|
| 399 |
beep_count_env = getenv(ENV_SANDBOX_BEEP); |
| 400 |
if (beep_count_env) |
| 401 |
beep_count = atoi(beep_count_env); |
| 402 |
else |
| 403 |
beep_count = DEFAULT_BEEP_COUNT; |
| 404 |
|
| 405 |
for (i = 0; i < beep_count; i++) { |
| 406 |
fputc('\a', stderr); |
| 407 |
if (i < beep_count - 1) |
| 408 |
sleep(1); |
| 409 |
} |
| 410 |
return 1; |
| 411 |
} |
| 412 |
|
| 413 |
int |
| 414 |
spawn_shell(char *argv_bash[]) |
| 415 |
{ |
| 416 |
#ifdef USE_SYSTEM_SHELL |
| 417 |
int i = 0; |
| 418 |
char *sh = NULL; |
| 419 |
int first = 1; |
| 420 |
int ret; |
| 421 |
long len = 0; |
| 422 |
|
| 423 |
while (1) { |
| 424 |
if (NULL == argv_bash[i]) |
| 425 |
break; |
| 426 |
if (NULL != sh) |
| 427 |
len = strlen(sh); |
| 428 |
sh = (char *) realloc(sh, len + strlen(argv_bash[i]) + 5); |
| 429 |
if (first) { |
| 430 |
sh[0] = 0; |
| 431 |
first = 0; |
| 432 |
} |
| 433 |
strcat(sh, "\""); |
| 434 |
strcat(sh, argv_bash[i]); |
| 435 |
strcat(sh, "\" "); |
| 436 |
|
| 437 |
//printf("%s\n", argv_bash[i]); |
| 438 |
i++; |
| 439 |
} |
| 440 |
printf("%s\n", sh); |
| 441 |
ret = system(sh); |
| 442 |
if (sh) |
| 443 |
free(sh); |
| 444 |
sh = NULL; |
| 445 |
|
| 446 |
if (-1 == ret) |
| 447 |
return 0; |
| 448 |
return 1; |
| 449 |
|
| 450 |
#else |
| 451 |
# ifndef NO_FORK |
| 452 |
int pid; |
| 453 |
int status = 0; |
| 454 |
int ret = 0; |
| 455 |
|
| 456 |
pid = fork(); |
| 457 |
|
| 458 |
/* Child's process */ |
| 459 |
if (0 == pid) { |
| 460 |
# endif |
| 461 |
execv(argv_bash[0], argv_bash); |
| 462 |
# ifndef NO_FORK |
| 463 |
return 0; |
| 464 |
} else if (pid < 0) { |
| 465 |
return 0; |
| 466 |
} |
| 467 |
ret = waitpid(pid, &status, 0); |
| 468 |
if ((-1 == ret) || (status > 0)) |
| 469 |
return 0; |
| 470 |
# endif |
| 471 |
return 1; |
| 472 |
#endif |
| 473 |
} |
| 474 |
|
| 475 |
int |
| 476 |
main(int argc, char **argv) |
| 477 |
{ |
| 478 |
int i = 0, success = 1; |
| 479 |
#ifdef USE_LD_SO_PRELOAD |
| 480 |
int preload_file = -1; |
| 481 |
#endif |
| 482 |
int sandbox_log_presence = 0; |
| 483 |
int sandbox_log_file = -1; |
| 484 |
int pids_file = -1; |
| 485 |
long len; |
| 486 |
|
| 487 |
int *pids_array = NULL; |
| 488 |
int num_of_pids = 0; |
| 489 |
|
| 490 |
// char run_arg[255]; |
| 491 |
char portage_tmp_dir[PATH_MAX]; |
| 492 |
char var_tmp_dir[PATH_MAX]; |
| 493 |
char tmp_dir[PATH_MAX]; |
| 494 |
char sandbox_log[255]; |
| 495 |
char sandbox_debug_log[255]; |
| 496 |
char sandbox_dir[255]; |
| 497 |
char sandbox_lib[255]; |
| 498 |
char *sandbox_pids_file; |
| 499 |
char sandbox_rc[255]; |
| 500 |
char pid_string[255]; |
| 501 |
char **argv_bash = NULL; |
| 502 |
|
| 503 |
char *run_str = "-c"; |
| 504 |
char *home_dir = NULL; |
| 505 |
char *tmp_string = NULL; |
| 506 |
#ifdef USE_LD_SO_PRELOAD |
| 507 |
char **preload_array = NULL; |
| 508 |
int num_of_preloads = 0; |
| 509 |
#endif |
| 510 |
|
| 511 |
/* Only print info if called with no arguments .... */ |
| 512 |
if (argc < 2) |
| 513 |
print_debug = 1; |
| 514 |
|
| 515 |
if (print_debug) |
| 516 |
printf |
| 517 |
("========================== Gentoo linux path sandbox ===========================\n"); |
| 518 |
|
| 519 |
/* check if a sandbox is already running */ |
| 520 |
if (NULL != getenv(ENV_SANDBOX_ON)) { |
| 521 |
fprintf(stderr, |
| 522 |
"Not launching a new sandbox instance\nAnother one is already running in this process hierarchy.\n"); |
| 523 |
exit(1); |
| 524 |
} else { |
| 525 |
|
| 526 |
/* determine the location of all the sandbox support files */ |
| 527 |
if (print_debug) |
| 528 |
printf("Detection of the support files.\n"); |
| 529 |
|
| 530 |
/* Generate base sandbox path */ |
| 531 |
tmp_string = get_sandbox_path(argv[0]); |
| 532 |
strncpy(sandbox_dir, tmp_string, 254); |
| 533 |
if (tmp_string) |
| 534 |
free(tmp_string); |
| 535 |
tmp_string = NULL; |
| 536 |
strcat(sandbox_dir, "/"); |
| 537 |
|
| 538 |
/* Generate sandbox lib path */ |
| 539 |
tmp_string = get_sandbox_lib(sandbox_dir); |
| 540 |
strncpy(sandbox_lib, tmp_string, 254); |
| 541 |
if (tmp_string) |
| 542 |
free(tmp_string); |
| 543 |
tmp_string = NULL; |
| 544 |
|
| 545 |
/* Generate sandbox pids-file path */ |
| 546 |
sandbox_pids_file = get_sandbox_pids_file(); |
| 547 |
|
| 548 |
/* Generate sandbox bashrc path */ |
| 549 |
tmp_string = get_sandbox_rc(sandbox_dir); |
| 550 |
strncpy(sandbox_rc, tmp_string, 254); |
| 551 |
if (tmp_string) |
| 552 |
free(tmp_string); |
| 553 |
tmp_string = NULL; |
| 554 |
|
| 555 |
/* verify the existance of required files */ |
| 556 |
if (print_debug) |
| 557 |
printf("Verification of the required files.\n"); |
| 558 |
|
| 559 |
#ifndef SB_HAVE_64BIT_ARCH |
| 560 |
if (file_exist(sandbox_lib, 0) <= 0) { |
| 561 |
fprintf(stderr, "Could not open the sandbox library at '%s'.\n", |
| 562 |
sandbox_lib); |
| 563 |
return -1; |
| 564 |
} |
| 565 |
#endif |
| 566 |
if (file_exist(sandbox_rc, 0) <= 0) { |
| 567 |
fprintf(stderr, "Could not open the sandbox rc file at '%s'.\n", |
| 568 |
sandbox_rc); |
| 569 |
return -1; |
| 570 |
} |
| 571 |
#ifdef USE_LD_SO_PRELOAD |
| 572 |
/* ensure that the /etc/ld.so.preload file contains an entry for the sandbox lib */ |
| 573 |
if (print_debug) |
| 574 |
printf("Setting up the ld.so.preload file.\n"); |
| 575 |
|
| 576 |
/* check if the /etc/ld.so.preload is a regular file */ |
| 577 |
if (file_exist("/etc/ld.so.preload", 1) < 0) { |
| 578 |
fprintf(stderr, ">>> /etc/ld.so.preload file is not a regular file\n"); |
| 579 |
exit(1); |
| 580 |
} |
| 581 |
|
| 582 |
if (getuid() == 0) { |
| 583 |
/* Our r+ also will create the file if it doesn't exist */ |
| 584 |
preload_file = file_open("/etc/ld.so.preload", "r+", 1, 0644); |
| 585 |
if (-1 == preload_file) { |
| 586 |
preload_adaptable = 0; |
| 587 |
/* exit(1);*/ |
| 588 |
} |
| 589 |
} else { |
| 590 |
/* Avoid permissions warnings if we're not root */ |
| 591 |
preload_adaptable = 0; |
| 592 |
} |
| 593 |
|
| 594 |
/* Only update /etc/ld.so.preload if we can write to it ... */ |
| 595 |
if (1 == preload_adaptable) { |
| 596 |
/* Load entries of preload table */ |
| 597 |
num_of_preloads = load_preload_libs(preload_file, &preload_array); |
| 598 |
|
| 599 |
/* Zero out our ld.so.preload file */ |
| 600 |
file_truncate(preload_file); |
| 601 |
|
| 602 |
/* Write contents of preload file */ |
| 603 |
for (i = 0; i < num_of_preloads + 1; i++) { |
| 604 |
/* First entry should be our sandbox library */ |
| 605 |
if (0 == i) { |
| 606 |
if (write |
| 607 |
(preload_file, sandbox_lib, |
| 608 |
strlen(sandbox_lib)) != strlen(sandbox_lib)) { |
| 609 |
perror(">>> /etc/ld.so.preload file write"); |
| 610 |
success = 0; |
| 611 |
break; |
| 612 |
} |
| 613 |
} else { |
| 614 |
/* Output all other preload entries */ |
| 615 |
if (write |
| 616 |
(preload_file, preload_array[i - 1], |
| 617 |
strlen(preload_array[i - 1])) != strlen(preload_array[i - 1])) { |
| 618 |
perror(">>> /etc/ld.so.preload file write"); |
| 619 |
success = 0; |
| 620 |
break; |
| 621 |
} |
| 622 |
} |
| 623 |
/* Don't forget the return character after each line! */ |
| 624 |
if (1 != write(preload_file, "\n", 1)) { |
| 625 |
perror(">>> /etc/ld.so.preload file write"); |
| 626 |
success = 0; |
| 627 |
break; |
| 628 |
} |
| 629 |
} |
| 630 |
|
| 631 |
for (i = 0; i < num_of_preloads; i++) { |
| 632 |
if (preload_array[i]) |
| 633 |
free(preload_array[i]); |
| 634 |
preload_array[i] = NULL; |
| 635 |
} |
| 636 |
if (preload_array) |
| 637 |
free(preload_array); |
| 638 |
num_of_preloads = 0; |
| 639 |
preload_array = NULL; |
| 640 |
} |
| 641 |
|
| 642 |
/* That's all we needed to do with the preload file */ |
| 643 |
if (0 < preload_file) |
| 644 |
file_close(preload_file); |
| 645 |
preload_file = -1; |
| 646 |
#endif |
| 647 |
|
| 648 |
/* set up the required environment variables */ |
| 649 |
if (print_debug) |
| 650 |
printf("Setting up the required environment variables.\n"); |
| 651 |
|
| 652 |
/* Generate sandbox log full path */ |
| 653 |
tmp_string = get_sandbox_log(); |
| 654 |
strncpy(sandbox_log, tmp_string, 254); |
| 655 |
if (tmp_string) |
| 656 |
free(tmp_string); |
| 657 |
tmp_string = NULL; |
| 658 |
|
| 659 |
setenv(ENV_SANDBOX_LOG, sandbox_log, 1); |
| 660 |
|
| 661 |
snprintf(sandbox_debug_log, sizeof(sandbox_debug_log), "%s%s%s", |
| 662 |
DEBUG_LOG_FILE_PREFIX, pid_string, LOG_FILE_EXT); |
| 663 |
setenv(ENV_SANDBOX_DEBUG_LOG, sandbox_debug_log, 1); |
| 664 |
|
| 665 |
home_dir = getenv("HOME"); |
| 666 |
if (!home_dir) { |
| 667 |
home_dir = "/tmp"; |
| 668 |
setenv("HOME", home_dir, 1); |
| 669 |
} |
| 670 |
|
| 671 |
/* drobbins: we need to expand these paths using realpath() so that PORTAGE_TMPDIR |
| 672 |
* can contain symlinks (example, /var is a symlink, /var/tmp is a symlink.) Without |
| 673 |
* this, access is denied to /var/tmp, hurtin' ebuilds. |
| 674 |
*/ |
| 675 |
|
| 676 |
{ char *e; |
| 677 |
e = getenv("PORTAGE_TMPDIR"); |
| 678 |
if ( e && ( strlen(e) < sizeof(portage_tmp_dir)-1 ) && (strlen(e) > 1) ) |
| 679 |
realpath(e, portage_tmp_dir); |
| 680 |
|
| 681 |
} |
| 682 |
realpath("/var/tmp", var_tmp_dir); |
| 683 |
realpath("/tmp", tmp_dir); |
| 684 |
|
| 685 |
setenv(ENV_SANDBOX_DIR, sandbox_dir, 1); |
| 686 |
setenv(ENV_SANDBOX_LIB, sandbox_lib, 1); |
| 687 |
setenv("LD_PRELOAD", sandbox_lib, 1); |
| 688 |
|
| 689 |
if (!getenv(ENV_SANDBOX_DENY)) |
| 690 |
setenv(ENV_SANDBOX_DENY, LD_PRELOAD_FILE, 1); |
| 691 |
|
| 692 |
if (!getenv(ENV_SANDBOX_READ)) |
| 693 |
setenv(ENV_SANDBOX_READ, "/", 1); |
| 694 |
|
| 695 |
/* Set up Sandbox Write path */ |
| 696 |
setenv_sandbox_write(home_dir, portage_tmp_dir, var_tmp_dir, tmp_dir); |
| 697 |
setenv_sandbox_predict(home_dir); |
| 698 |
|
| 699 |
setenv(ENV_SANDBOX_ON, "1", 0); |
| 700 |
|
| 701 |
/* if the portage temp dir was present, cd into it */ |
| 702 |
if (NULL != portage_tmp_dir) |
| 703 |
chdir(portage_tmp_dir); |
| 704 |
|
| 705 |
argv_bash = (char **) malloc(6 * sizeof (char *)); |
| 706 |
argv_bash[0] = strdup("/bin/bash"); |
| 707 |
argv_bash[1] = strdup("-rcfile"); |
| 708 |
argv_bash[2] = strdup(sandbox_rc); |
| 709 |
|
| 710 |
if (argc < 2) |
| 711 |
argv_bash[3] = NULL; |
| 712 |
else |
| 713 |
argv_bash[3] = strdup(run_str); /* "-c" */ |
| 714 |
|
| 715 |
argv_bash[4] = NULL; /* strdup(run_arg); */ |
| 716 |
argv_bash[5] = NULL; |
| 717 |
|
| 718 |
if (argc >= 2) { |
| 719 |
for (i = 1; i < argc; i++) { |
| 720 |
if (NULL == argv_bash[4]) |
| 721 |
len = 0; |
| 722 |
else |
| 723 |
len = strlen(argv_bash[4]); |
| 724 |
|
| 725 |
argv_bash[4] = |
| 726 |
(char *) realloc(argv_bash[4], |
| 727 |
(len + strlen(argv[i]) + 2) * sizeof (char)); |
| 728 |
|
| 729 |
if (0 == len) |
| 730 |
argv_bash[4][0] = 0; |
| 731 |
if (1 != i) |
| 732 |
strcat(argv_bash[4], " "); |
| 733 |
|
| 734 |
strcat(argv_bash[4], argv[i]); |
| 735 |
} |
| 736 |
} |
| 737 |
|
| 738 |
/* set up the required signal handlers */ |
| 739 |
signal(SIGHUP, &stop); |
| 740 |
signal(SIGINT, &stop); |
| 741 |
signal(SIGQUIT, &stop); |
| 742 |
signal(SIGTERM, &stop); |
| 743 |
|
| 744 |
/* this one should NEVER be set in ebuilds, as it is the one |
| 745 |
* private thing libsandbox.so use to test if the sandbox |
| 746 |
* should be active for this pid, or not. |
| 747 |
* |
| 748 |
* azarah (3 Aug 2002) |
| 749 |
*/ |
| 750 |
|
| 751 |
setenv("SANDBOX_ACTIVE", "armedandready", 1); |
| 752 |
|
| 753 |
/* Load our PID into PIDs file */ |
| 754 |
success = 1; |
| 755 |
if (file_exist(sandbox_pids_file, 1) < 0) { |
| 756 |
success = 0; |
| 757 |
fprintf(stderr, ">>> %s is not a regular file\n", sandbox_pids_file); |
| 758 |
} else { |
| 759 |
pids_file = file_open(sandbox_pids_file, "r+", 1, 0664, "portage"); |
| 760 |
if (-1 == pids_file) |
| 761 |
success = 0; |
| 762 |
} |
| 763 |
if (1 == success) { |
| 764 |
/* Grab still active pids */ |
| 765 |
num_of_pids = load_active_pids(pids_file, &pids_array); |
| 766 |
|
| 767 |
/* Zero out file */ |
| 768 |
file_truncate(pids_file); |
| 769 |
|
| 770 |
/* Output active pids, and append our pid */ |
| 771 |
for (i = 0; i < num_of_pids + 1; i++) { |
| 772 |
/* Time for our entry */ |
| 773 |
if (i == num_of_pids) |
| 774 |
sprintf(pid_string, "%d\n", getpid()); |
| 775 |
else |
| 776 |
sprintf(pid_string, "%d\n", pids_array[i]); |
| 777 |
|
| 778 |
if (write(pids_file, pid_string, strlen(pid_string)) != |
| 779 |
strlen(pid_string)) { |
| 780 |
perror(">>> pids file write"); |
| 781 |
success = 0; |
| 782 |
break; |
| 783 |
} |
| 784 |
} |
| 785 |
/* Clean pids_array */ |
| 786 |
if (pids_array) |
| 787 |
free(pids_array); |
| 788 |
pids_array = NULL; |
| 789 |
num_of_pids = 0; |
| 790 |
|
| 791 |
/* We're done with the pids file */ |
| 792 |
file_close(pids_file); |
| 793 |
} |
| 794 |
|
| 795 |
/* Something went wrong, bail out */ |
| 796 |
if (0 == success) { |
| 797 |
perror(">>> pids file write"); |
| 798 |
exit(1); |
| 799 |
} |
| 800 |
|
| 801 |
/* STARTING PROTECTED ENVIRONMENT */ |
| 802 |
if (print_debug) { |
| 803 |
printf("The protected environment has been started.\n"); |
| 804 |
printf |
| 805 |
("--------------------------------------------------------------------------------\n"); |
| 806 |
} |
| 807 |
|
| 808 |
if (print_debug) |
| 809 |
printf("Shell being started in forked process.\n"); |
| 810 |
|
| 811 |
/* Start Bash */ |
| 812 |
if (!spawn_shell(argv_bash)) { |
| 813 |
if (print_debug) |
| 814 |
fprintf(stderr, ">>> shell process failed to spawn\n"); |
| 815 |
success = 0; |
| 816 |
} |
| 817 |
|
| 818 |
/* Free bash stuff */ |
| 819 |
for (i = 0; i < 6; i++) { |
| 820 |
if (argv_bash[i]) |
| 821 |
free(argv_bash[i]); |
| 822 |
argv_bash[i] = NULL; |
| 823 |
} |
| 824 |
if (argv_bash) |
| 825 |
free(argv_bash); |
| 826 |
argv_bash = NULL; |
| 827 |
|
| 828 |
if (print_debug) |
| 829 |
printf("Cleaning up sandbox process\n"); |
| 830 |
|
| 831 |
cleanup(); |
| 832 |
|
| 833 |
if (print_debug) { |
| 834 |
printf |
| 835 |
("========================== Gentoo linux path sandbox ===========================\n"); |
| 836 |
printf("The protected environment has been shut down.\n"); |
| 837 |
} |
| 838 |
|
| 839 |
if (file_exist(sandbox_log, 0)) { |
| 840 |
sandbox_log_presence = 1; |
| 841 |
success = 1; |
| 842 |
if (!print_sandbox_log(sandbox_log)) |
| 843 |
success = 0; |
| 844 |
|
| 845 |
#if 0 |
| 846 |
if (!success) |
| 847 |
exit(1); |
| 848 |
#endif |
| 849 |
|
| 850 |
sandbox_log_file = -1; |
| 851 |
} else if (print_debug) { |
| 852 |
printf |
| 853 |
("--------------------------------------------------------------------------------\n"); |
| 854 |
} |
| 855 |
|
| 856 |
if ((sandbox_log_presence) || (!success)) |
| 857 |
return 1; |
| 858 |
else |
| 859 |
return 0; |
| 860 |
} |
| 861 |
} |
| 862 |
|
| 863 |
// vim:expandtab noai:cindent ai |
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