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Revision 133 - (hide annotations) (download) (as text)
Wed Jul 6 00:36:46 2005 UTC (9 years, 5 months ago) by azarah
Original Path: trunk/sandbox.c
File MIME type: text/x-csrc
File size: 15165 byte(s)
Remove unused 'pids file' code.
1 ferringb 2 /*
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 azarah 101 struct sandbox_info_t {
37     char sandbox_log[SB_PATH_MAX];
38     char sandbox_debug_log[SB_PATH_MAX];
39     char sandbox_dir[SB_PATH_MAX];
40     char sandbox_lib[SB_PATH_MAX];
41     char sandbox_rc[SB_PATH_MAX];
42     char portage_tmp_dir[SB_PATH_MAX];
43     char var_tmp_dir[SB_PATH_MAX];
44     char tmp_dir[SB_PATH_MAX];
45     char *home_dir;
46     } sandbox_info_t;
47 ferringb 2
48 azarah 101 static char *tmp_dir;
49    
50 azarah 99 static int print_debug = 0;
51     static int stop_called = 0;
52    
53 azarah 101 int sandbox_setup(char *argv[], struct sandbox_info_t *sandbox_info)
54     {
55     if (NULL == realpath(getenv(ENV_PORTAGE_TMPDIR) ? getenv(ENV_PORTAGE_TMPDIR)
56     : PORTAGE_TMPDIR,
57     sandbox_info->portage_tmp_dir)) {
58     perror(">>> get portage_tmp_dir");
59     return -1;
60     }
61 azarah 108 setenv(ENV_PORTAGE_TMPDIR, sandbox_info->portage_tmp_dir, 1);
62 azarah 101
63     if (NULL == realpath(VAR_TMPDIR, sandbox_info->var_tmp_dir)) {
64     perror(">>> get var_tmp_dir");
65     return -1;
66     }
67    
68     if (-1 == get_tmp_dir(sandbox_info->tmp_dir)) {
69     perror(">>> get tmp_dir");
70     return -1;
71     }
72     tmp_dir = sandbox_info->tmp_dir;
73 azarah 108 setenv(ENV_TMPDIR, tmp_dir, 1);
74 azarah 101
75     sandbox_info->home_dir = getenv("HOME");
76     if (!sandbox_info->home_dir) {
77     sandbox_info->home_dir = tmp_dir;
78     setenv("HOME", sandbox_info->home_dir, 1);
79     }
80    
81     /* Generate base sandbox path */
82     snprintf(sandbox_info->sandbox_dir, SB_PATH_MAX, "%s/",
83     get_sandbox_path(argv[0]));
84    
85     /* Generate sandbox lib path */
86     snprintf(sandbox_info->sandbox_lib, SB_PATH_MAX, "%s",
87     get_sandbox_lib(sandbox_info->sandbox_dir));
88    
89     /* Generate sandbox bashrc path */
90     snprintf(sandbox_info->sandbox_rc, SB_PATH_MAX, "%s",
91     get_sandbox_rc(sandbox_info->sandbox_dir));
92    
93     /* Generate sandbox log full path */
94     snprintf(sandbox_info->sandbox_log, SB_PATH_MAX, "%s",
95     get_sandbox_log(tmp_dir));
96    
97     /* Generate sandbox debug log full path */
98     snprintf(sandbox_info->sandbox_debug_log, SB_PATH_MAX, "%s",
99     get_sandbox_debug_log(tmp_dir));
100    
101     return 0;
102     }
103    
104 azarah 88 int print_sandbox_log(char *sandbox_log)
105     {
106     int sandbox_log_file = -1;
107     char *beep_count_env = NULL;
108     int i, color, beep_count = 0;
109     long len = 0;
110     char *buffer = NULL;
111    
112     sandbox_log_file = file_open(sandbox_log, "r", 1, 0664, "portage");
113     if (-1 == sandbox_log_file)
114     return 0;
115    
116     len = file_length(sandbox_log_file);
117     buffer = (char *)malloc((len + 1) * sizeof(char));
118     memset(buffer, 0, len + 1);
119     read(sandbox_log_file, buffer, len);
120     file_close(sandbox_log_file);
121    
122     color = ((getenv("NOCOLOR") != NULL) ? 0 : 1);
123    
124     if (color)
125     printf("\e[31;01m");
126     printf("--------------------------- ACCESS VIOLATION SUMMARY ---------------------------");
127     if (color)
128     printf("\033[0m");
129     if (color)
130     printf("\e[31;01m");
131     printf("\nLOG FILE = \"%s\"", sandbox_log);
132     if (color)
133     printf("\033[0m");
134     printf("\n\n");
135     printf("%s", buffer);
136     if (buffer)
137     free(buffer);
138     buffer = NULL;
139     printf("\e[31;01m--------------------------------------------------------------------------------\033[0m\n");
140    
141     beep_count_env = getenv(ENV_SANDBOX_BEEP);
142     if (beep_count_env)
143     beep_count = atoi(beep_count_env);
144     else
145     beep_count = DEFAULT_BEEP_COUNT;
146    
147     for (i = 0; i < beep_count; i++) {
148     fputc('\a', stderr);
149     if (i < beep_count - 1)
150     sleep(1);
151     }
152     return 1;
153     }
154    
155 azarah 30 void stop(int signum)
156 ferringb 2 {
157     if (stop_called == 0) {
158     stop_called = 1;
159     printf("Caught signal %d in pid %d\r\n", signum, getpid());
160     } else {
161     fprintf(stderr, "Pid %d alreadly caught signal and is still cleaning up\n", getpid());
162     }
163     }
164    
165 azarah 101 void get_sandbox_write_envvar(char *buf, struct sandbox_info_t *sandbox_info)
166 ferringb 2 {
167 azarah 89 /* bzero out entire buffer then append trailing 0 */
168 azarah 93 memset(buf, 0, SB_BUF_LEN);
169 azarah 30
170 azarah 89 /* these could go into make.globals later on */
171     snprintf(buf, SB_BUF_LEN,
172     "%s:%s/.gconfd/lock:%s/.bash_history:%s:%s:%s:%s",
173 azarah 113 "/dev/zero:/dev/null:/dev/fd:/proc/self/fd:/dev/pts/:"
174 azarah 105 "/dev/vc/:/dev/pty:/dev/tty:/dev/console:"
175 azarah 89 "/dev/shm/ngpt:/var/log/scrollkeeper.log:"
176     "/usr/tmp/conftest:/usr/lib/conftest:"
177     "/usr/lib32/conftest:/usr/lib64/conftest:"
178     "/usr/tmp/cf:/usr/lib/cf:/usr/lib32/cf:/usr/lib64/cf",
179 azarah 101 sandbox_info->home_dir, sandbox_info->home_dir,
180     (NULL != sandbox_info->portage_tmp_dir) ? sandbox_info->portage_tmp_dir : tmp_dir,
181     sandbox_info->tmp_dir, sandbox_info->var_tmp_dir,
182     "/tmp/:/var/tmp/");
183 azarah 89 }
184    
185 azarah 101 void get_sandbox_predict_envvar(char *buf, struct sandbox_info_t *sandbox_info)
186 azarah 89 {
187 ferringb 2 /* bzero out entire buffer then append trailing 0 */
188 azarah 93 memset(buf, 0, SB_BUF_LEN);
189 ferringb 2
190 azarah 89 /* these should go into make.globals later on */
191     snprintf(buf, SB_BUF_LEN, "%s/.:"
192     "/usr/lib/python2.0/:"
193     "/usr/lib/python2.1/:"
194     "/usr/lib/python2.2/:"
195     "/usr/lib/python2.3/:"
196     "/usr/lib/python2.4/:"
197     "/usr/lib/python2.5/:"
198 azarah 126 "/usr/lib/python3.0/:"
199     "/var/db/aliases.db:"
200     "/var/db/netgroup.db:"
201     "/var/db/netmasks.db:"
202     "/var/db/ethers.db:"
203     "/var/db/rpc.db:"
204     "/var/db/protocols.db:"
205     "/var/db/services.db:"
206     "/var/db/networks.db:"
207     "/var/db/hosts.db:"
208     "/var/db/group.db:"
209 azarah 131 "/var/db/passwd.db",
210 azarah 101 sandbox_info->home_dir);
211 azarah 89 }
212 ferringb 2
213 azarah 124 int sandbox_setenv(char **env, const char *name, const char *val) {
214 azarah 89 char **tmp_env = env;
215     char *tmp_string = NULL;
216    
217 azarah 100 /* XXX: We add the new variable to the end (no replacing). If this
218     * is changed, we need to fix sandbox_setup_environ() below */
219 azarah 89 while (NULL != *tmp_env)
220     tmp_env++;
221    
222     /* strlen(name) + strlen(val) + '=' + '\0' */
223 azarah 96 /* FIXME: Should probably free this at some stage - more neatness than
224     * a real leak that will cause issues. */
225 azarah 89 tmp_string = calloc(strlen(name) + strlen(val) + 2, sizeof(char *));
226     if (NULL == tmp_string) {
227     perror(">>> out of memory (sandbox_setenv)");
228     exit(1);
229 ferringb 2 }
230 azarah 89
231     snprintf(tmp_string, strlen(name) + strlen(val) + 2, "%s=%s",
232     name, val);
233     *tmp_env = tmp_string;
234    
235     return 0;
236 ferringb 2 }
237    
238 azarah 89 /* We setup the environment child side only to prevent issues with
239     * setting LD_PRELOAD parent side */
240 azarah 124 char **sandbox_setup_environ(struct sandbox_info_t *sandbox_info)
241 ferringb 2 {
242 azarah 89 int env_size = 0;
243 azarah 100 int have_ld_preload = 0;
244 azarah 89
245     char **new_environ;
246     char **env_ptr = environ;
247 azarah 124 char sandbox_write_envvar[SB_BUF_LEN];
248     char sandbox_predict_envvar[SB_BUF_LEN];
249 azarah 89 char *ld_preload_envvar = NULL;
250 azarah 100 char *orig_ld_preload_envvar = NULL;
251 ferringb 2
252 azarah 89 /* Unset these, as its easier than replacing when setting up our
253     * new environment below */
254     unsetenv(ENV_SANDBOX_DIR);
255     unsetenv(ENV_SANDBOX_LIB);
256     unsetenv(ENV_SANDBOX_BASHRC);
257     unsetenv(ENV_SANDBOX_LOG);
258     unsetenv(ENV_SANDBOX_DEBUG_LOG);
259    
260 azarah 100 if (NULL != getenv(ENV_LD_PRELOAD)) {
261     have_ld_preload = 1;
262     orig_ld_preload_envvar = getenv(ENV_LD_PRELOAD);
263    
264 azarah 96 /* FIXME: Should probably free this at some stage - more neatness
265     * than a real leak that will cause issues. */
266 azarah 100 ld_preload_envvar = calloc(strlen(orig_ld_preload_envvar) +
267 azarah 101 strlen(sandbox_info->sandbox_lib) + 2,
268     sizeof(char *));
269 azarah 89 if (NULL == ld_preload_envvar)
270     return NULL;
271 azarah 100 snprintf(ld_preload_envvar, strlen(orig_ld_preload_envvar) +
272 azarah 101 strlen(sandbox_info->sandbox_lib) + 2, "%s %s",
273     sandbox_info->sandbox_lib, orig_ld_preload_envvar);
274 azarah 89 } else {
275 azarah 96 /* FIXME: Should probably free this at some stage - more neatness
276     * than a real leak that will cause issues. */
277 azarah 101 ld_preload_envvar = strndup(sandbox_info->sandbox_lib,
278     strlen(sandbox_info->sandbox_lib));
279 azarah 89 if (NULL == ld_preload_envvar)
280     return NULL;
281     }
282 azarah 100 /* Do not unset this, as strange things might happen */
283     /* unsetenv(ENV_LD_PRELOAD); */
284 ferringb 2
285 azarah 89 while (NULL != *env_ptr) {
286     env_size++;
287     env_ptr++;
288     }
289 ferringb 2
290 azarah 96 /* FIXME: Should probably free this at some stage - more neatness than
291     * a real leak that will cause issues. */
292 azarah 89 new_environ = calloc((env_size + 15 + 1) * sizeof(char *), sizeof(char *));
293     if (NULL == new_environ)
294     return NULL;
295    
296     /* First add our new variables to the beginning - this is due to some
297     * weirdness that I cannot remember */
298 azarah 101 sandbox_setenv(new_environ, ENV_SANDBOX_DIR, sandbox_info->sandbox_dir);
299     sandbox_setenv(new_environ, ENV_SANDBOX_LIB, sandbox_info->sandbox_lib);
300     sandbox_setenv(new_environ, ENV_SANDBOX_BASHRC, sandbox_info->sandbox_rc);
301     sandbox_setenv(new_environ, ENV_SANDBOX_LOG, sandbox_info->sandbox_log);
302     sandbox_setenv(new_environ, ENV_SANDBOX_DEBUG_LOG,
303     sandbox_info->sandbox_debug_log);
304 azarah 100 /* If LD_PRELOAD was not set, set it here, else do it below */
305     if (1 != have_ld_preload)
306     sandbox_setenv(new_environ, ENV_LD_PRELOAD, ld_preload_envvar);
307 azarah 89
308     if (!getenv(ENV_SANDBOX_DENY))
309     sandbox_setenv(new_environ, ENV_SANDBOX_DENY, LD_PRELOAD_FILE);
310    
311     if (!getenv(ENV_SANDBOX_READ))
312     sandbox_setenv(new_environ, ENV_SANDBOX_READ, "/");
313    
314 azarah 124 get_sandbox_write_envvar(sandbox_write_envvar, sandbox_info);
315 azarah 89 if (!getenv(ENV_SANDBOX_WRITE))
316     sandbox_setenv(new_environ, ENV_SANDBOX_WRITE, sandbox_write_envvar);
317    
318 azarah 124 get_sandbox_predict_envvar(sandbox_predict_envvar, sandbox_info);
319 azarah 89 if (!getenv(ENV_SANDBOX_PREDICT))
320     sandbox_setenv(new_environ, ENV_SANDBOX_PREDICT, sandbox_predict_envvar);
321    
322     /* This one should NEVER be set in ebuilds, as it is the one
323     * private thing libsandbox.so use to test if the sandbox
324     * should be active for this pid, or not.
325     *
326     * azarah (3 Aug 2002)
327     */
328    
329     sandbox_setenv(new_environ, "SANDBOX_ACTIVE", "armedandready");
330    
331     env_size = 0;
332     while (NULL != new_environ[env_size])
333     env_size++;
334    
335     /* Now add the rest */
336     env_ptr = environ;
337     while (NULL != *env_ptr) {
338 azarah 100 if ((1 == have_ld_preload) &&
339     (strstr(*env_ptr, LD_PRELOAD_EQ) == *env_ptr))
340     /* If LD_PRELOAD was set, and this is it in the original
341     * environment, replace it with our new copy */
342 azarah 101 /* XXX: The following works as it just add whatever as
343     * the last variable to nev_environ */
344 azarah 100 sandbox_setenv(new_environ, ENV_LD_PRELOAD,
345     ld_preload_envvar);
346     else
347     new_environ[env_size + (env_ptr - environ)] = *env_ptr;
348 azarah 89 env_ptr++;
349 ferringb 2 }
350 azarah 89
351     return new_environ;
352 ferringb 2 }
353    
354 azarah 89 int spawn_shell(char *argv_bash[], char *env[])
355 ferringb 2 {
356     int pid;
357     int status = 0;
358     int ret = 0;
359    
360     pid = fork();
361    
362     /* Child's process */
363     if (0 == pid) {
364 azarah 89 execve(argv_bash[0], argv_bash, env);
365 ferringb 2 return 0;
366     } else if (pid < 0) {
367     return 0;
368     }
369     ret = waitpid(pid, &status, 0);
370     if ((-1 == ret) || (status > 0))
371     return 0;
372 azarah 86
373 ferringb 2 return 1;
374     }
375    
376 azarah 30 int main(int argc, char **argv)
377 ferringb 2 {
378 azarah 101 int i = 0, success = 1;
379 ferringb 2 int sandbox_log_presence = 0;
380     long len;
381    
382 azarah 101 struct sandbox_info_t sandbox_info;
383 ferringb 2
384 azarah 89 char **sandbox_environ;
385 ferringb 2 char **argv_bash = NULL;
386    
387     char *run_str = "-c";
388    
389     /* Only print info if called with no arguments .... */
390     if (argc < 2)
391     print_debug = 1;
392    
393     if (print_debug)
394 azarah 30 printf("========================== Gentoo linux path sandbox ===========================\n");
395 ferringb 2
396     /* check if a sandbox is already running */
397     if (NULL != getenv(ENV_SANDBOX_ON)) {
398 azarah 30 fprintf(stderr, "Not launching a new sandbox instance\n");
399     fprintf(stderr, "Another one is already running in this process hierarchy.\n");
400 ferringb 2 exit(1);
401     } else {
402    
403     /* determine the location of all the sandbox support files */
404     if (print_debug)
405     printf("Detection of the support files.\n");
406    
407 azarah 101 if (-1 == sandbox_setup(argv, &sandbox_info)) {
408     perror(">>> setup");
409 azarah 99 exit(1);
410     }
411 azarah 101
412 ferringb 2 /* verify the existance of required files */
413     if (print_debug)
414     printf("Verification of the required files.\n");
415    
416     #ifndef SB_HAVE_64BIT_ARCH
417 azarah 101 if (file_exist(sandbox_info.sandbox_lib, 0) <= 0) {
418     fprintf(stderr, "Could not open the sandbox library at '%s'.\n",
419     sandbox_info.sandbox_lib);
420 ferringb 2 return -1;
421 azarah 30 }
422 ferringb 2 #endif
423 azarah 101 if (file_exist(sandbox_info.sandbox_rc, 0) <= 0) {
424     fprintf(stderr, "Could not open the sandbox rc file at '%s'.\n",
425     sandbox_info.sandbox_rc);
426 ferringb 2 return -1;
427     }
428    
429     /* set up the required environment variables */
430     if (print_debug)
431     printf("Setting up the required environment variables.\n");
432    
433 azarah 91 /* This one should not be child only, as we check above to see
434     * if we are already running (check sandbox_setup_environ).
435     * This needs to be set before calling sandbox_setup_environ(),
436     * else its not set for the child */
437     setenv(ENV_SANDBOX_ON, "1", 0);
438    
439     /* Setup the child environment stuff */
440 azarah 124 sandbox_environ = sandbox_setup_environ(&sandbox_info);
441 azarah 89 if (NULL == sandbox_environ) {
442     perror(">>> out of memory (environ)");
443     exit(1);
444 azarah 71 }
445 ferringb 2
446     /* if the portage temp dir was present, cd into it */
447 azarah 101 if (NULL != sandbox_info.portage_tmp_dir)
448     chdir(sandbox_info.portage_tmp_dir);
449 ferringb 2
450 azarah 30 argv_bash = (char **)malloc(6 * sizeof(char *));
451 ferringb 2 argv_bash[0] = strdup("/bin/bash");
452     argv_bash[1] = strdup("-rcfile");
453 azarah 101 argv_bash[2] = strdup(sandbox_info.sandbox_rc);
454 ferringb 2
455     if (argc < 2)
456     argv_bash[3] = NULL;
457     else
458     argv_bash[3] = strdup(run_str); /* "-c" */
459    
460 azarah 30 argv_bash[4] = NULL; /* strdup(run_arg); */
461 ferringb 2 argv_bash[5] = NULL;
462    
463     if (argc >= 2) {
464     for (i = 1; i < argc; i++) {
465     if (NULL == argv_bash[4])
466     len = 0;
467     else
468     len = strlen(argv_bash[4]);
469    
470 azarah 89 argv_bash[4] = (char *)realloc(argv_bash[4],
471     (len + strlen(argv[i]) + 2) * sizeof(char));
472 ferringb 2
473     if (0 == len)
474     argv_bash[4][0] = 0;
475     if (1 != i)
476     strcat(argv_bash[4], " ");
477    
478     strcat(argv_bash[4], argv[i]);
479     }
480     }
481    
482     /* set up the required signal handlers */
483     signal(SIGHUP, &stop);
484     signal(SIGINT, &stop);
485     signal(SIGQUIT, &stop);
486     signal(SIGTERM, &stop);
487    
488     /* STARTING PROTECTED ENVIRONMENT */
489     if (print_debug) {
490     printf("The protected environment has been started.\n");
491 azarah 30 printf("--------------------------------------------------------------------------------\n");
492 ferringb 2 }
493    
494     if (print_debug)
495     printf("Shell being started in forked process.\n");
496    
497     /* Start Bash */
498 azarah 89 if (!spawn_shell(argv_bash, sandbox_environ)) {
499 ferringb 2 if (print_debug)
500     fprintf(stderr, ">>> shell process failed to spawn\n");
501     success = 0;
502     }
503    
504     /* Free bash stuff */
505     for (i = 0; i < 6; i++) {
506     if (argv_bash[i])
507     free(argv_bash[i]);
508     argv_bash[i] = NULL;
509     }
510     if (argv_bash)
511     free(argv_bash);
512     argv_bash = NULL;
513    
514     if (print_debug)
515     printf("Cleaning up sandbox process\n");
516    
517     if (print_debug) {
518 azarah 30 printf("========================== Gentoo linux path sandbox ===========================\n");
519 ferringb 2 printf("The protected environment has been shut down.\n");
520     }
521    
522 azarah 101 if (file_exist(sandbox_info.sandbox_log, 0)) {
523 ferringb 2 sandbox_log_presence = 1;
524 azarah 123 print_sandbox_log(sandbox_info.sandbox_log);
525 ferringb 2 } else if (print_debug) {
526 azarah 30 printf("--------------------------------------------------------------------------------\n");
527 ferringb 2 }
528    
529     if ((sandbox_log_presence) || (!success))
530     return 1;
531     else
532     return 0;
533     }
534     }
535    
536 azarah 30 // vim:noexpandtab noai:cindent ai

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