source: trunk/src/sh_extern.c@ 509

Last change on this file since 509 was 491, checked in by katerina, 9 years ago

Fix for ticket #389 (libwrap) and #390 (update on FreeBSD).
File size: 37.3 KB
Line 
1/* SAMHAIN file system integrity testing */
2/* Copyright (C) 2000,2004 Rainer Wichmann */
3/* */
4/* This program is free software; you can redistribute it */
5/* and/or modify */
6/* it under the terms of the GNU General Public License as */
7/* published by */
8/* the Free Software Foundation; either version 2 of the License, or */
9/* (at your option) any later version. */
10/* */
11/* This program is distributed in the hope that it will be useful, */
12/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
13/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
14/* GNU General Public License for more details. */
15/* */
16/* You should have received a copy of the GNU General Public License */
17/* along with this program; if not, write to the Free Software */
18/* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19
20
21#include "config_xor.h"
22
23
24#include <stdio.h>
25#include <string.h>
26#ifdef HAVE_MEMORY_H
27#include <memory.h>
28#endif
29
30/* replace #if 0 by #if 1 and set an appropriate path in front of '/pdbg.'
31 * for debugging
32 */
33#if 0
34#define PDGBFILE "/pdbg."
35#endif
36
37
38#if defined(PDGBFILE)
39static FILE * pdbg = NULL;
40static FILE * pdbgc = NULL;
41#define PDBG_OPEN if (pdbg == NULL) pdbg = fopen(PDGBFILE"main", "a")
42#define PDBG_CLOSE sl_fclose (FIL__, __LINE__, pdbg); pdbg = NULL
43#define PDBG(arg) fprintf(pdbg, "PDBG: step %d\n", arg); fflush(pdbg)
44#define PDBG_D(arg) fprintf(pdbg, "PDBG: %d\n", arg); fflush(pdbg)
45#define PDBG_S(arg) fprintf(pdbg, "PDBG: %s\n", arg); fflush(pdbg)
46
47#define PDBGC_OPEN if (pdbgc == NULL) pdbgc = fopen(PDGBFILE"child", "a")
48#define PDBGC_CLOSE sl_fclose (FIL__, __LINE__, pdbgc); pdbgc = NULL
49#define PDBGC(arg) fprintf(pdbgc, "PDBGC: step %d\n", arg); fflush(pdbgc)
50#define PDBGC_D(arg) fprintf(pdbgc, "PDBGC: %d\n", arg); fflush(pdbgc)
51#define PDBGC_S(arg) fprintf(pdbgc, "PDBGC: %s\n", arg); fflush(pdbgc)
52#else
53#define PDBG_OPEN
54#define PDBG_CLOSE
55#define PDBG(arg)
56#define PDBG_D(arg)
57#define PDBG_S(arg)
58#define PDBGC_OPEN
59#define PDBGC_CLOSE
60#define PDBGC(arg)
61#define PDBGC_D(arg)
62#define PDBGC_S(arg)
63#endif
64
65
66#include <stdlib.h>
67#include <pwd.h>
68#include <unistd.h>
69#include <fcntl.h>
70#include <signal.h>
71#include <sys/stat.h>
72#include <sys/types.h>
73#include <errno.h>
74#include <sys/wait.h>
75
76#if TIME_WITH_SYS_TIME
77#include <sys/time.h>
78#include <time.h>
79#else
80#if HAVE_SYS_TIME_H
81#include <sys/time.h>
82#else
83#include <time.h>
84#endif
85#endif
86
87
88#include "samhain.h"
89#include "sh_utils.h"
90#include "sh_unix.h"
91#include "sh_tiger.h"
92#include "sh_extern.h"
93#include "sh_calls.h"
94#include "sh_filter.h"
95#define SH_NEED_PWD_GRP 1
96#include "sh_static.h"
97
98
99#undef FIL__
100#define FIL__ _("sh_extern.c")
101
102extern int get_the_fd (SL_TICKET ticket);
103
104/*
105 * -- generic safe popen
106 */
107
108int sh_ext_popen (sh_tas_t * task)
109{
110 long status = 0;
111 int flags;
112 char * tmp;
113 char * tmp2;
114 int errnum;
115 int pipedes[2];
116 FILE * outf = NULL;
117 char * envp[1];
118 char * argp[2];
119
120 char * errfile;
121 char errbuf[SH_ERRBUF_SIZE];
122
123 static int some_error = 0;
124
125#if defined (__linux__)
126 SL_TICKET fd = -1;
127 char pname[128];
128 int pfd = -1;
129#endif
130
131 SL_ENTER(_("sh_ext_popen"));
132
133 /* Linux, HP-UX and FreeBSD will happily accept envp = argp = NULL
134 * (newer Linuxes (gcc 4.4.4) warn on argp == NULL, but accept it,
135 * as reported by T. Luettgert)
136 * Solaris (and probably some other Unices)
137 * needs a valid *envp[] with envp[0] = NULL;
138 * and similarly for argp
139 * OpenBSD finally needs non-null argp[0] ...
140 */
141 argp[0] = task->command;
142 argp[1] = NULL;
143 envp[0] = NULL;
144
145 /*
146 * -- check whether path is trustworthy
147 */
148 status = sl_trustfile(task->command, NULL, NULL);
149#if 0
150 if ((uid_t) -1 != task->trusted_users[0])
151 {
152 status = sl_trustfile(task->command, task->trusted_users, NULL);
153 }
154#endif
155
156 PDBG_OPEN;
157 PDBG_D( (int) status);
158
159 if ( SL_ENONE != status)
160 {
161 PDBG_S("SL_ENONE != status");
162 if (some_error == 0)
163 {
164 tmp = sh_util_safe_name (task->command);
165 errfile = sl_trust_errfile();
166 if (errfile[0] != '\0')
167 {
168 tmp2 = sh_util_safe_name (sl_trust_errfile());
169 sh_error_handle((-1), FIL__, __LINE__, status, MSG_E_TRUST2,
170 sl_error_string((int)status), tmp, tmp2);
171 SH_FREE(tmp2);
172 }
173 else
174 {
175 sh_error_handle((-1), FIL__, __LINE__, status, MSG_E_TRUST1,
176 sl_error_string((int)status), tmp);
177 }
178 SH_FREE(tmp);
179 }
180 some_error = 1;
181 SL_RETURN ((-1), _("sh_ext_popen"));
182 }
183
184 PDBG(1);
185
186 /*
187 * -- check whether the checksum is correct; with linux emulate fdexec
188 */
189#if ( !defined(__linux__) || ( defined(__linux__) && defined(HAVE_PTHREAD)) ) && !defined(SL_DEBUG)
190 if (task->checksum[0] != '\0')
191 {
192 char hashbuf[KEYBUF_SIZE];
193 PDBG_S("checksum test");
194 if (0 != sl_strcmp(task->checksum,
195 sh_tiger_hash (task->command, TIGER_FILE, TIGER_NOLIM,
196 hashbuf, sizeof(hashbuf))
197 )
198 )
199 {
200 PDBG_S("checksum mismatch");
201 if (some_error == 0)
202 {
203 tmp = sh_util_safe_name (task->command);
204 sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_HASH, tmp);
205 SH_FREE(tmp);
206 }
207 some_error = 1;
208 SL_RETURN ((-1), _("sh_ext_popen"));
209 }
210 }
211#endif
212
213 some_error = 0;
214
215 PDBG(2);
216
217 /*
218 * -- Create the pipe
219 */
220 if (aud_pipe(FIL__, __LINE__, pipedes) < 0)
221 {
222 PDBG_S("pipe() failure");
223 errnum = errno;
224 sh_error_handle((-1), FIL__, __LINE__, errnum, MSG_E_SUBGEN,
225 sh_error_message(errnum, errbuf, sizeof(errbuf)), _("pipe"));
226 SL_RETURN ((-1), _("sh_ext_popen"));
227 }
228
229 PDBG(3);
230
231 /*
232 * -- Flush streams and fork
233 */
234 fflush (NULL);
235
236 task->pid = aud_fork(FIL__, __LINE__);
237
238 if (task->pid == (pid_t) - 1)
239 {
240 PDBG_S("fork() failure");
241 /*@-usedef@*/
242 (void) sl_close_fd(FIL__, __LINE__, pipedes[0]);
243 (void) sl_close_fd(FIL__, __LINE__, pipedes[1]);
244 /*@+usedef@*/
245 errnum = errno;
246 sh_error_handle((-1), FIL__, __LINE__, errnum, MSG_E_SUBGEN,
247 sh_error_message(errnum, errbuf, sizeof(errbuf)), _("fork"));
248 SL_RETURN ((-1), _("sh_ext_popen"));
249 }
250
251 PDBG(4);
252
253 if (task->pid == (pid_t) 0)
254 {
255 /*
256 * -- fork again, if requested
257 */
258 if (S_TRUE == task->fork_twice)
259 {
260 task->pid = fork();
261
262 if (task->pid == (pid_t) - 1)
263 {
264 _exit (EXIT_FAILURE);
265 }
266 }
267
268 if (task->pid == (pid_t) 0)
269 {
270 int val_return;
271
272 PDBGC_OPEN;
273 PDBGC(1);
274
275 /*
276 * -- grandchild - make write side of the pipe stdin
277 */
278 if (task->rw == 'w')
279 {
280 do {
281 val_return = dup2 (pipedes[STDIN_FILENO], STDIN_FILENO);
282 } while (val_return < 0 && errno == EINTR);
283
284 if (val_return < 0)
285 _exit(EXIT_FAILURE);
286 }
287 else
288 {
289 do {
290 val_return = dup2 (pipedes[STDOUT_FILENO], STDOUT_FILENO);
291 } while (val_return < 0 && errno == EINTR);
292
293 if (val_return < 0)
294 _exit(EXIT_FAILURE);
295 }
296 PDBGC(2);
297
298
299 /* close the pipe descriptors
300 */
301 (void) sl_close_fd (FIL__, __LINE__, pipedes[STDIN_FILENO]);
302 (void) sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
303
304 /* don't leak file descriptors
305 */
306#if !defined(PDGBFILE)
307 sh_unix_closeall (3, task->com_fd, S_TRUE); /* in child process */
308#endif
309
310 /* drop root privileges, if possible && requested
311 */
312 if (task->privileged == 0 && 0 == getuid())
313 {
314 PDBGC_S("privileged");
315
316 /* zero priv info
317 */
318 memset(skey, 0, sizeof(sh_key_t));
319
320 if (setgid((gid_t) task->run_user_gid) != 0)
321 _exit(EXIT_FAILURE);
322 if (setuid((uid_t) task->run_user_uid) != 0)
323 _exit(EXIT_FAILURE);
324
325 /* make sure we cannot get root again
326 */
327 if (setuid(0) >= 0)
328 _exit(EXIT_FAILURE);
329 }
330
331 PDBGC(3);
332 (void) fflush(NULL);
333
334 if (task->rw == 'w')
335 {
336 PDBGC_S("w");
337 (void) fcntl (STDOUT_FILENO, F_SETFD, FD_CLOEXEC);
338 (void) fcntl (STDERR_FILENO, F_SETFD, FD_CLOEXEC);
339 /*
340 freopen(_("/dev/null"), "r+", stderr);
341 freopen(_("/dev/null"), "r+", stdout);
342 */
343 }
344 else
345 {
346 PDBGC_S("r");
347 do {
348 val_return = dup2 (STDOUT_FILENO, STDERR_FILENO);
349 } while (val_return < 0 && errno == EINTR);
350
351 (void) fcntl (STDIN_FILENO, F_SETFD, FD_CLOEXEC);
352 /*
353 freopen(_("/dev/null"), "r+", stdin);
354 */
355 }
356
357 PDBGC(4);
358
359
360#if defined(__linux__)
361 /*
362 * -- emulate an fdexec with checksum testing
363 */
364
365#if !defined(HAVE_PTHREAD)
366 if (task->checksum[0] != '\0')
367#endif
368 {
369 PDBGC_S("fexecve");
370 if (task->com_fd != (-1))
371 {
372 do {
373 val_return = dup (task->com_fd);
374 } while (val_return < 0 && errno == EINTR);
375 pfd = val_return;
376 if (pfd < 0)
377 {
378 PDBGC_S("fexecve: dup failed");
379 _exit(EXIT_FAILURE);
380 }
381 }
382#if !defined(HAVE_PTHREAD)
383 else
384 {
385 char hashbuf[KEYBUF_SIZE];
386
387 fd =
388 sl_open_read(FIL__, __LINE__, task->command,
389 task->privileged==0 ? SL_NOPRIV : SL_YESPRIV);
390
391 if (0 != sl_strcmp(task->checksum,
392 sh_tiger_hash (task->command,
393 fd, TIGER_NOLIM, hashbuf, sizeof(hashbuf))))
394 {
395 PDBGC_S("fexecve: checksum mismatch");
396 sl_close(fd);
397 _exit(EXIT_FAILURE);
398 }
399
400 pfd = get_the_fd(fd);
401
402 do {
403 val_return = dup (pfd);
404 } while (val_return < 0 && errno == EINTR);
405 pfd = val_return;
406
407 sl_close(fd);
408 fd = -1;
409
410 if (pfd < 0)
411 {
412 PDBGC_S("fexecve: dup (2) failed");
413 _exit(EXIT_FAILURE);
414 }
415 }
416#endif
417
418 PDBGC(5);
419 /* Cannot use sprintf because of deadlock in malloc/free */
420 {
421 static char digit[] = "0123456789";
422 char str0[128];
423 char str1[128];
424 int ival = pfd;
425 unsigned int n = 0;
426 unsigned int m = 0;
427
428 if (ival < 0) ival = -ival;
429 do {
430 str0[n] = digit[ival % 10];
431 ++n;
432 ival /= 10;
433 } while (ival);
434
435 if (pfd < 0)
436 {
437 str0[n] = '-';
438 ++n;
439 }
440 str0[n] = '\0';
441 str1[n] = '\0';
442 while (n > 0)
443 {
444 str1[m] = str0[n-1];
445 ++m; --n;
446 }
447 sl_strlcpy(pname, _("/proc/self/fd/"), sizeof(pname));
448 sl_strlcat(pname, str1, sizeof(pname));
449 }
450 if (access(pname, R_OK|X_OK) == 0) /* flawfinder: ignore */
451 {
452 PDBGC(6);
453 PDBGC_CLOSE;
454 fcntl (pfd, F_SETFD, FD_CLOEXEC);
455 do {
456 val_return = execve (pname,
457 (task->argc == 0) ? argp : task->argv,
458 (task->envc == 0) ? NULL : task->envv
459 );
460 } while (val_return < 0 && errno == EINTR);
461
462 errnum = errno;
463 PDBGC_OPEN;
464 PDBGC_S(strerror(errnum));
465 PDBGC_S(task->command);
466 PDBGC_S("fexecve: failed");
467 PDBGC_CLOSE;
468 /* failed
469 */
470 _exit((errnum == 0) ? (EXIT_SUCCESS) : (EXIT_FAILURE));
471 }
472 PDBGC_S("fexecve: not working");
473 /*
474 * procfs not working, go ahead; checksum is tested already
475 */
476 if (fd != -1)
477 sl_close(fd);
478 else if (pfd != -1)
479 sl_close_fd(FIL__, __LINE__, pfd);
480 }
481#endif
482
483 PDBGC_S(" -- non fexecve --");
484 /*
485 * -- execute path if executable
486 */
487 if (0 == access(task->command, R_OK|X_OK)) /* flawfinder: ignore */
488 {
489 PDBGC(5);
490 PDBGC_CLOSE;
491 do {
492 val_return = execve (task->command,
493 (task->argc == 0) ? argp : task->argv,
494 (task->envc == 0) ? envp : task->envv
495 );
496 } while (val_return < 0 && errno == EINTR);
497 }
498 errnum = errno;
499 PDBGC_OPEN;
500 PDBGC_S(strerror(errnum));
501 PDBGC_S(task->command);
502 PDBGC_S("execve: failed");
503 PDBGC_CLOSE;
504 /* failed
505 */
506 _exit((errnum == 0) ? (EXIT_SUCCESS) : (EXIT_FAILURE));
507 }
508 /*
509 * if we have forked twice, this is parent::detached_subprocess
510 */
511 if (S_TRUE == task->fork_twice)
512 {
513 _exit (0);
514 }
515 }
516
517
518 /*
519 * -- parent; task->pid is child pid; exit status is status of
520 * grandchild if exited
521 */
522 if (S_TRUE == task->fork_twice)
523 {
524 (void) waitpid (task->pid, NULL, 0);
525 }
526
527 PDBG(5);
528 /* open an output stream on top of the write side of the pipe
529 */
530 if (task->rw == 'w')
531 {
532 PDBG_S("is w");
533 (void) sl_close_fd (FIL__, __LINE__, pipedes[STDIN_FILENO]);
534 (void) retry_fcntl (FIL__, __LINE__, pipedes[STDOUT_FILENO],
535 F_SETFD, FD_CLOEXEC);
536 outf = fdopen (pipedes[STDOUT_FILENO], "w");
537 }
538 else
539 {
540 PDBG_S("is r");
541 (void) sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
542 (void) retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO],
543 F_SETFD, FD_CLOEXEC);
544 outf = fdopen (pipedes[STDIN_FILENO], "r");
545 }
546
547 if (outf == NULL)
548 {
549 errnum = errno;
550 PDBG_S("outf == NULL");
551 tmp = sh_util_safe_name (task->command);
552
553 if (task->privileged == 0 && 0 == getuid())
554 sh_error_handle((-1), FIL__, __LINE__, errnum, MSG_NOEXEC,
555 (UID_CAST) task->run_user_uid, tmp);
556 else
557 sh_error_handle((-1), FIL__, __LINE__, errnum, MSG_NOEXEC,
558 (UID_CAST) getuid(), tmp);
559
560 SH_FREE(tmp);
561
562 (void) aud_kill (FIL__, __LINE__, task->pid, SIGKILL);
563 (void) sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
564 (void) sl_close_fd (FIL__, __LINE__, pipedes[STDIN_FILENO]);
565 (void) waitpid (task->pid, NULL, 0);
566 task->pid = 0;
567
568 SL_RETURN ((-1), _("sh_ext_popen"));
569 }
570
571 if (task->rw == 'w')
572 task->pipeFD = pipedes[STDOUT_FILENO];
573 else
574 task->pipeFD = pipedes[STDIN_FILENO];
575
576 PDBG_D(task->pipeFD);
577
578 task->pipeTI = sl_make_ticket(FIL__, __LINE__, task->pipeFD, _("pipe"), outf);
579
580 flags = (int) retry_fcntl (FIL__, __LINE__, task->pipeFD, F_GETFL, 0);
581 if (flags != (-1))
582 (void) retry_fcntl (FIL__, __LINE__, task->pipeFD,
583 F_SETFL, flags|O_NONBLOCK);
584 task->pipe = outf;
585
586 PDBG_S("return from popen");
587 PDBG_CLOSE;
588
589 SL_RETURN (0, _("sh_ext_popen"));
590}
591
592/*
593 * -- close the pipe
594 */
595extern int flag_err_debug;
596
597int sh_ext_pclose (sh_tas_t * task)
598{
599 int status = 0;
600 int retry = 0;
601 pid_t retval;
602 char infomsg[256];
603
604#ifdef WCONTINUED
605 int wflags = WNOHANG|WUNTRACED|WCONTINUED;
606#else
607 int wflags = WNOHANG|WUNTRACED;
608#endif
609
610 SL_ENTER(_("sh_ext_pclose"));
611
612 PDBG_OPEN;
613 PDBG_S(" -> pclose");
614 (void) fflush(task->pipe);
615 if (!SL_ISERROR(task->pipeTI))
616 (void) sl_close(task->pipeTI);
617
618 task->pipe = NULL;
619 task->pipeFD = (-1);
620 task->pipeTI = SL_ETICKET;
621
622 if (S_FALSE == task->fork_twice)
623 {
624 infomsg[0] = '\0';
625
626 nochmal:
627 retval = waitpid(task->pid, &(task->exit_status), wflags);
628 /*@-bufferoverflowhigh@*/
629 if (task->pid == retval)
630 {
631#ifndef USE_UNO
632 if (WIFEXITED(task->exit_status) != 0)
633 {
634 task->exit_status = WEXITSTATUS(task->exit_status);
635 if ((flag_err_debug == S_TRUE) || (task->exit_status != 0))
636 sl_snprintf(infomsg, sizeof(infomsg),
637 _("Subprocess exited normally with status %d"),
638 task->exit_status);
639 }
640 else if (WIFSIGNALED(task->exit_status) != 0)
641 {
642 sl_snprintf(infomsg, sizeof(infomsg),
643 _("Subprocess terminated by signal %d"),
644 WTERMSIG(task->exit_status));
645 task->exit_status = EXIT_FAILURE;
646 }
647 else if (WIFSTOPPED(task->exit_status) != 0)
648 {
649 sl_snprintf(infomsg, sizeof(infomsg),
650 _("Subprocess stopped by signal %d, killing"),
651 WSTOPSIG(task->exit_status));
652 task->exit_status = EXIT_FAILURE;
653 (void) aud_kill (FIL__, __LINE__, task->pid, 9);
654 (void) retry_msleep (0, 30);
655 (void) waitpid (task->pid, NULL, wflags);
656 }
657 else
658 {
659 sl_snprintf(infomsg, sizeof(infomsg),
660 _("Subprocess exit status unknown"));
661 task->exit_status = EXIT_FAILURE;
662 }
663#else
664 task->exit_status = EXIT_FAILURE;
665#endif
666 }
667 else if (0 == retval)
668 {
669 if (retry < 3)
670 {
671 ++retry;
672 (void) retry_msleep(0, (retry * 30));
673 goto nochmal;
674 }
675 (void) aud_kill (FIL__, __LINE__, task->pid, 9);
676 sl_snprintf(infomsg, sizeof(infomsg),
677 _("Subprocess not yet exited, killing"));
678 task->exit_status = EXIT_FAILURE;
679 (void) waitpid (task->pid, NULL, 0);
680 }
681 else
682 {
683 sl_snprintf(infomsg, sizeof(infomsg),
684 _("Waitpid returned error %d\n"), errno);
685 task->exit_status = EXIT_FAILURE;
686 }
687 /*@+bufferoverflowhigh@*/
688 status = task->exit_status;
689 if (flag_err_debug == S_TRUE)
690 {
691 sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, task->exit_status,
692 MSG_E_SUBGEN, infomsg, _("sh_ext_pclose"));
693 }
694 else if (status != 0)
695 {
696 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, task->exit_status,
697 MSG_E_SUBGEN, infomsg, _("sh_ext_pclose"));
698 }
699 }
700
701 task->pid = 0;
702 task->exit_status = 0;
703 PDBG_S(" <--");
704 PDBG_CLOSE;
705 SL_RETURN (status, _("sh_ext_pclose"));
706}
707
708void sh_ext_tas_init (sh_tas_t * tas)
709{
710 int i;
711
712 tas->command = NULL;
713 tas->argc = 0;
714 tas->envc = 0;
715 tas->checksum[0] = '\0';
716 tas->pipeFD = (-1);
717 tas->pipeTI = SL_ETICKET;
718 tas->pid = (pid_t) -1;
719 tas->privileged = 1;
720 tas->pipe = NULL;
721 tas->rw = 'w';
722 tas->exit_status = 0;
723 tas->fork_twice = S_TRUE;
724
725 for (i = 0; i < 32; ++i)
726 {
727 tas->argv[i] = NULL;
728 tas->envv[i] = NULL;
729#if 0
730 tas->trusted_users[i] = (uid_t) -1;
731#endif
732 }
733
734 tas->run_user_uid = (uid_t) getuid();
735 tas->run_user_gid = (gid_t) getgid();
736
737 tas->com_fd = -1;
738 tas->com_ti = -1;
739 return;
740}
741
742
743int sh_ext_tas_add_envv(sh_tas_t * tas, const char * key, const char * val)
744{
745 size_t sk = 0, sv = 0;
746 int si;
747
748 SL_ENTER(_("sh_ext_tas_add_envv"));
749
750 if (tas == NULL || (key == NULL && val == NULL) ||
751 tas->envc >= 30)
752 {
753 SL_RETURN (-1, _("sh_ext_tas_add_envv"));
754 }
755 if (key != NULL)
756 sk = strlen(key) + 1;
757 if (val != NULL)
758 sv = strlen(val) + 1;
759
760 if (!sl_ok_adds(sk, sv))
761 {
762 SL_RETURN (-1, _("sh_ext_tas_add_envv"));
763 }
764 si = tas->envc;
765 tas->envv[si] = SH_ALLOC(sk + sv);
766
767 if (key != NULL)
768 {
769 (void) sl_strlcpy(tas->envv[si], key, sk+sv);
770 (void) sl_strlcat(tas->envv[si], "=", sk+sv);
771 if (val != NULL)
772 (void) sl_strlcat(tas->envv[si], val, sk+sv);
773 }
774 else
775 (void) sl_strlcpy(tas->envv[si], val, sv);
776
777 ++(tas->envc);
778 SL_RETURN ((tas->envc), _("sh_ext_tas_add_envv"));
779}
780
781int sh_ext_tas_rm_argv(sh_tas_t * tas)
782{
783 int last;
784
785 SL_ENTER(_("sh_ext_tas_rm_argv"));
786 if (tas == NULL || tas->argc == 0)
787 {
788 SL_RETURN (-1, _("sh_ext_tas_rm_argv"));
789 }
790
791 last = (tas->argc - 1);
792 --(tas->argc);
793 SH_FREE(tas->argv[last]);
794 tas->argv[last] = NULL;
795 SL_RETURN ((tas->argc), _("sh_ext_tas_rm_argv"));
796}
797
798int sh_ext_tas_add_argv(sh_tas_t * tas, const char * val)
799{
800 size_t sv = 0;
801 int si;
802
803 SL_ENTER(_("sh_ext_tas_add_argv"));
804
805 if (tas == NULL || val == NULL ||
806 tas->argc >= 30)
807 {
808 SL_RETURN (-1, _("sh_ext_tas_add_argv"));
809 }
810
811 if (val != NULL)
812 sv = strlen(val) + 1;
813
814 si = tas->argc;
815 tas->argv[si] = SH_ALLOC(sv);
816
817 (void) sl_strlcpy(tas->argv[si], val, sv);
818
819 ++(tas->argc);
820 SL_RETURN ((tas->argc), _("sh_ext_tas_add_argv"));
821}
822
823void sh_ext_tas_command(sh_tas_t * tas, const char * command)
824{
825 size_t len = sl_strlen(command);
826 tas->command = SH_ALLOC(len+1);
827 (void) sl_strlcpy(tas->command, command, len+1);
828 return;
829}
830
831void sh_ext_tas_free(sh_tas_t * tas)
832{
833 int i;
834 if (NULL != tas->command) SH_FREE(tas->command);
835
836 for (i = 0; i < 32; ++i)
837 {
838 if (NULL != tas->argv[i]) SH_FREE(tas->argv[i]);
839 if (NULL != tas->envv[i]) SH_FREE(tas->envv[i]);
840 }
841
842 if (tas->com_ti != (-1))
843 {
844 (void) sl_close(tas->com_ti);
845 tas->com_ti = -1;
846 tas->com_fd = -1;
847 }
848
849 return;
850}
851
852static void task_init (sh_tas_t * task)
853{
854 sh_ext_tas_init(task);
855
856 (void) sh_ext_tas_add_envv (task, _("SHELL"),
857 _("/bin/sh"));
858 (void) sh_ext_tas_add_envv (task, _("PATH"),
859 _("/sbin:/bin:/usr/sbin:/usr/bin:/usr/ucb"));
860 (void) sh_ext_tas_add_envv (task, _("IFS"), " \n\t");
861
862 if (sh.timezone != NULL)
863 {
864 (void) sh_ext_tas_add_envv(task, "TZ", sh.timezone);
865 }
866 return;
867}
868
869int sh_ext_popen_init (sh_tas_t * task, const char * command, char * argv0, ...)
870{
871 va_list vl;
872 int status;
873
874 task_init (task);
875
876 if (!argv0)
877 {
878 sh_ext_tas_command(task, _("/bin/sh"));
879
880 (void) sh_ext_tas_add_argv(task, _("/bin/sh"));
881 (void) sh_ext_tas_add_argv(task, _("-c"));
882 (void) sh_ext_tas_add_argv(task, command);
883 }
884 else
885 {
886 char * s;
887
888 sh_ext_tas_command(task, command);
889
890 (void) sh_ext_tas_add_argv(task, argv0);
891
892 va_start (vl, argv0);
893 s = va_arg (vl, char * );
894 while (s != NULL)
895 {
896 (void) sh_ext_tas_add_argv(task, s);
897 s = va_arg (vl, char * );
898 }
899 va_end (vl);
900
901 }
902 task->rw = 'r';
903 task->fork_twice = S_FALSE;
904
905 status = sh_ext_popen(task);
906
907 return status;
908}
909
910/* Execute a system command */
911
912int sh_ext_system (char * command, char * argv0, ...)
913{
914 sh_tas_t task;
915 int status;
916 va_list vl;
917 char * s;
918
919 SL_ENTER(_("sh_ext_system"));
920
921 task_init (&task);
922
923 sh_ext_tas_command(&task, command);
924
925 (void) sh_ext_tas_add_argv(&task, argv0);
926
927 va_start (vl, argv0);
928 s = va_arg (vl, char * );
929 while (s != NULL)
930 {
931 (void) sh_ext_tas_add_argv(&task, s);
932 s = va_arg (vl, char * );
933 }
934 va_end (vl);
935
936 task.rw = 'r';
937 task.fork_twice = S_FALSE;
938
939 status = sh_ext_popen(&task);
940
941 if (status != 0)
942 {
943 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_E_SUBGEN,
944 _("Could not execute command"), _("sh_ext_system"));
945 SL_RETURN ((-1), _("sh_ext_system"));
946 }
947
948 /* close pipe and return exit status
949 */
950 (void) sh_ext_pclose(&task);
951 sh_ext_tas_free (&task);
952 SL_RETURN ((status), _("sh_ext_system"));
953}
954
955/* Execute command, return first line of output
956 * ifconfig | grep -1 lo | tail -n 1 | sed s/.*inet addr:\([0-9.]*\)\(.*\)/\1/
957 */
958char * sh_ext_popen_str (const char * command)
959{
960 sh_tas_t task;
961 struct sigaction new_act;
962 struct sigaction old_act;
963 char * out = NULL;
964 int status;
965
966 SL_ENTER(_("sh_ext_popen_str"));
967
968 status = sh_ext_popen_init (&task, command, NULL, NULL);
969
970 if (status != 0)
971 {
972 sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, status, MSG_E_SUBGEN,
973 _("Could not open pipe"), _("sh_ext_popen_str"));
974 SL_RETURN ((NULL), _("sh_ext_popen_str"));
975 }
976
977 /* ignore SIGPIPE (instead get EPIPE if connection is closed)
978 */
979 new_act.sa_handler = SIG_IGN;
980 new_act.sa_flags = 0;
981 sigemptyset( &new_act.sa_mask );
982
983 (void) retry_sigaction (FIL__, __LINE__, SIGPIPE, &new_act, &old_act);
984
985 /* read from the open pipe
986 */
987 if (task.pipe != NULL)
988 {
989 int try = 1200; /* 1000 * 0.1 = 120 sec */
990 sh_string * s = sh_string_new(0);
991 do {
992 sh_string_read(s, task.pipe, 0);
993 if (sh_string_len(s) == 0)
994 {
995 --try; retry_msleep(0, 100);
996 }
997 } while (sh_string_len(s) == 0 && try != 0);
998
999 if (sh_string_len(s) == 0)
1000 {
1001 sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, status, MSG_E_SUBGEN,
1002 _("No output from command"), _("sh_ext_popen_str"));
1003 }
1004
1005 out = sh_util_strdup(sh_string_str(s));
1006 sh_string_destroy(&s);
1007 }
1008
1009 /* restore old signal handler
1010 */
1011 (void) retry_sigaction (FIL__, __LINE__, SIGPIPE, &old_act, NULL);
1012
1013 /* close pipe and return exit status
1014 */
1015 (void) sh_ext_pclose(&task);
1016 sh_ext_tas_free (&task);
1017 SL_RETURN ((out), _("sh_ext_popen_str"));
1018}
1019
1020
1021
1022
1023/* --------------- EXTERN STUFF ------------------- */
1024
1025#if defined(WITH_EXTERNAL)
1026
1027typedef struct _sh_com_t
1028{
1029 char type[4];
1030
1031 sh_filter_type * filter;
1032
1033 time_t deadtime;
1034 time_t last_run;
1035
1036 sh_tas_t tas;
1037
1038 struct _sh_com_t * next;
1039
1040} sh_com_t;
1041
1042
1043static
1044void set3 (char * pos, char c1, char c2, char c3)
1045{
1046 pos[0] = c1;
1047 pos[1] = c2;
1048 pos[2] = c3;
1049 pos[3] = '\0';
1050 return;
1051}
1052
1053
1054
1055/* initialize the external command structure
1056 */
1057static
1058sh_com_t * command_init(void)
1059{
1060 uid_t ff_euid;
1061 sh_com_t * ext_com = NULL;
1062
1063 SL_ENTER(_("command_init"));
1064
1065 ext_com = (sh_com_t *) SH_ALLOC(sizeof(sh_com_t));
1066
1067 if (!ext_com)
1068 {
1069 SL_RETURN( NULL, _("command_init"));
1070 }
1071
1072 sh_ext_tas_init (&(ext_com->tas));
1073
1074 (void) sl_get_euid(&ff_euid);
1075#if 0
1076 ext_com->tas.trusted_users[0] = (uid_t) 0;
1077 ext_com->tas.trusted_users[1] = (uid_t) (ff_euid);
1078#endif
1079
1080 /* ------------------------------------------------- */
1081
1082 set3(ext_com->type, 'l', 'o', 'g');
1083 ext_com->filter = NULL;
1084 ext_com->deadtime = 0;
1085 ext_com->last_run = 0;
1086
1087 ext_com->next = NULL;
1088
1089 SL_RETURN( ext_com, _("command_init"));
1090}
1091
1092/* the list of external commands
1093 */
1094static sh_com_t * ext_coms = NULL;
1095
1096/* if -1, allocation of last command has failed,
1097 * thus don't fill in options
1098 */
1099static int ext_failed = -1;
1100
1101static
1102int sh_ext_add_envv(const char * key, const char * val)
1103{
1104 int retval;
1105
1106 SL_ENTER(_("sh_ext_add_envv"));
1107
1108 if (ext_coms == NULL || ext_failed == (-1) ||
1109 (key == NULL && val == NULL) ||
1110 ext_coms->tas.envc >= 30)
1111 {
1112 SL_RETURN (-1, _("sh_ext_add_envv"));
1113 }
1114
1115 retval = sh_ext_tas_add_envv(&(ext_coms->tas), key, val);
1116
1117 if (retval >= 0)
1118 retval = 0;
1119
1120 SL_RETURN (retval, _("sh_ext_add_envv"));
1121}
1122
1123
1124
1125static
1126int sh_ext_init(const char * command)
1127{
1128 sh_com_t * retval;
1129 size_t size;
1130
1131 SL_ENTER(_("sh_ext_init"));
1132
1133 if (command == NULL)
1134 {
1135 SL_RETURN (-1, _("sh_ext_init"));
1136 }
1137 size = strlen(command);
1138 if (command[0] != '/' || size < 2)
1139 {
1140 SL_RETURN (-1, _("sh_ext_init"));
1141 }
1142
1143 if (NULL == (retval = command_init()))
1144 {
1145 SL_RETURN (-1, _("sh_ext_init"));
1146 }
1147
1148 sh_ext_tas_command(&(retval->tas), command);
1149
1150 if (sh.timezone != NULL)
1151 {
1152 (void) sh_ext_add_envv( "TZ", sh.timezone);
1153 }
1154
1155 retval->next = ext_coms;
1156 ext_coms = retval;
1157 SL_RETURN (0, _("sh_ext_init"));
1158}
1159
1160static
1161int sh_ext_uid (const char * user, /*@out@*/uid_t * uid, /*@out@*/gid_t * gid)
1162{
1163 struct passwd * tempres;
1164#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1165 struct passwd pwd;
1166 char * buffer = SH_ALLOC(SH_PWBUF_SIZE);
1167#endif
1168
1169 SL_ENTER(_("sh_ext_uid"));
1170
1171 *uid = (uid_t)-1; *gid = (gid_t)-1;
1172
1173 if (user == NULL)
1174 {
1175#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1176 SH_FREE(buffer);
1177#endif
1178 SL_RETURN (-1, _("sh_ext_uid"));
1179 }
1180
1181#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1182 sh_getpwnam_r(user, &pwd, buffer, SH_PWBUF_SIZE, &tempres);
1183#else
1184 tempres = sh_getpwnam(user);
1185#endif
1186
1187 if (NULL != tempres)
1188 {
1189 *uid = tempres->pw_uid;
1190 *gid = tempres->pw_gid;
1191#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1192 SH_FREE(buffer);
1193#endif
1194 SL_RETURN (0, _("sh_ext_uid"));
1195 }
1196
1197#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1198 SH_FREE(buffer);
1199#endif
1200 SL_RETURN (-1, _("sh_ext_uid"));
1201}
1202
1203
1204static
1205int sh_ext_add (const char * argstring, int * ntok, char * stok[])
1206{
1207 int i = 0;
1208 size_t s;
1209 char * p;
1210 char * new;
1211 size_t len;
1212
1213 SL_ENTER(_("sh_ext_add"));
1214
1215 if (NULL == argstring)
1216 {
1217 SL_RETURN((-1), _("sh_ext_add"));
1218 }
1219
1220 len = strlen(argstring) + 1;
1221 new = SH_ALLOC(len);
1222 sl_strlcpy(new, argstring, len);
1223
1224 do
1225 {
1226#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1227 char * saveptr;
1228 if (i == 0)
1229 p = strtok_r (new, ", \t", &saveptr);
1230 else
1231 p = strtok_r (NULL, ", \t", &saveptr);
1232#else
1233 if (i == 0)
1234 p = strtok (new, ", \t");
1235 else
1236 p = strtok (NULL, ", \t");
1237#endif
1238
1239 if (p == NULL)
1240 break;
1241
1242 s = strlen(p) + 1;
1243 if (stok[i] != NULL)
1244 SH_FREE(stok[i]);
1245 stok[i] = SH_ALLOC(s);
1246 (void) sl_strlcpy(stok[i], p, s);
1247
1248 ++i;
1249 if (i == 30)
1250 break;
1251 }
1252 while (p != NULL);
1253
1254 *ntok = i;
1255 SH_FREE(new);
1256
1257 SL_RETURN (0, _("sh_ext_add"));
1258}
1259
1260/*********************************************************
1261 *
1262 * Public functions
1263 *
1264 *
1265 *********************************************************/
1266
1267/*
1268 * -- start a new external command, and add it to the list
1269 */
1270int sh_ext_setcommand(const char * cmd)
1271{
1272 int i;
1273
1274 SL_ENTER(_("sh_ext_setcommand"));
1275 if ( (i = sh_ext_init(cmd)) < 0)
1276 ext_failed = -1;
1277 else
1278 ext_failed = 0;
1279 SL_RETURN( i, _("sh_ext_setcommand"));
1280}
1281
1282
1283/*
1284 * -- clean up the command list
1285 */
1286int sh_ext_cleanup(void)
1287{
1288 sh_com_t * retval;
1289
1290 SL_ENTER(_("sh_ext_cleanup"));
1291
1292 while (ext_coms != NULL)
1293 {
1294 retval = ext_coms;
1295 ext_coms = retval->next;
1296
1297 sh_ext_tas_free (&(retval->tas));
1298
1299 if (retval->filter)
1300 sh_filter_free (retval->filter);
1301
1302 SH_FREE(retval);
1303
1304 }
1305
1306 SL_RETURN (0, _("sh_ext_cleanup"));
1307}
1308
1309/*
1310 * -- explicitely close a command
1311 */
1312int sh_ext_close_command (const char * str)
1313{
1314 (void) str;
1315 if (ext_coms == NULL || ext_failed == (-1))
1316 return (-1);
1317 ext_failed = (-1);
1318 return 0;
1319}
1320
1321/*
1322 * -- add keywords to the OR filter
1323 */
1324int sh_ext_add_or (const char * str)
1325{
1326 if (ext_coms == NULL || ext_failed == (-1))
1327 return (-1);
1328 if (ext_coms->filter == NULL)
1329 ext_coms->filter = sh_filter_alloc();
1330 return (sh_filter_add(str, ext_coms->filter, SH_FILT_OR));
1331}
1332
1333/*
1334 * -- add keywords to the AND filter
1335 */
1336int sh_ext_add_and (const char * str)
1337{
1338 if (ext_coms == NULL || ext_failed == (-1))
1339 return (-1);
1340 if (ext_coms->filter == NULL)
1341 ext_coms->filter = sh_filter_alloc();
1342 return (sh_filter_add(str, ext_coms->filter, SH_FILT_AND));
1343}
1344
1345/*
1346 * -- add keywords to the NOT filter
1347 */
1348int sh_ext_add_not (const char * str)
1349{
1350 if (ext_coms == NULL || ext_failed == (-1))
1351 return (-1);
1352 if (ext_coms->filter == NULL)
1353 ext_coms->filter = sh_filter_alloc();
1354 return (sh_filter_add(str, ext_coms->filter, SH_FILT_NOT));
1355}
1356
1357/*
1358 * -- add keywords to the CL argument list
1359 */
1360int sh_ext_add_argv (const char * str)
1361{
1362 if (ext_coms == NULL || ext_failed == (-1))
1363 return (-1);
1364 return (sh_ext_add (str, &(ext_coms->tas.argc), ext_coms->tas.argv));
1365}
1366
1367/*
1368 * -- add a path to the environment
1369 */
1370int sh_ext_add_default (const char * dummy)
1371{
1372 char * p = NULL;
1373 int i;
1374 char dir[SH_PATHBUF];
1375
1376 SL_ENTER(_("sh_ext_add_default"));
1377 if (dummy[0] == 'n' || dummy[0] == 'N' ||
1378 dummy[0] == 'f' || dummy[0] == 'F' || dummy[0] == '0')
1379 {
1380 SL_RETURN(0, _("sh_ext_add_default"));
1381 }
1382 p = sh_unix_getUIDdir (SH_ERR_ERR, (uid_t) ext_coms->tas.run_user_uid,
1383 dir, sizeof(dir));
1384 if (p)
1385 (void) sh_ext_add_envv (_("HOME"), p);
1386 (void) sh_ext_add_envv (_("SHELL"), _("/bin/sh"));
1387 (void) sh_ext_add_envv (_("PATH"), _("/sbin:/bin:/usr/sbin:/usr/bin"));
1388 (void) sh_ext_add_envv (_("IFS"), " \n\t");
1389 i = (p == NULL ? (-1) : 0);
1390 SL_RETURN(i, _("sh_ext_add_default"));
1391}
1392
1393/*
1394 * -- add an environment variable
1395 */
1396int sh_ext_add_environ (const char * str)
1397{
1398 int i;
1399
1400 SL_ENTER(_("sh_ext_add_environ"));
1401 i = sh_ext_add_envv (NULL, str);
1402 SL_RETURN(i, _("sh_ext_add_environ"));
1403}
1404
1405/*
1406 * -- set deadtime
1407 */
1408int sh_ext_deadtime (const char * str)
1409{
1410 long deadtime = 0;
1411 char * tail = NULL;
1412
1413 SL_ENTER(_("sh_ext_deadtime"));
1414
1415 if (ext_coms == NULL || ext_failed == (-1) || str == NULL)
1416 {
1417 SL_RETURN (-1, _("sh_ext_deadtime"));
1418 }
1419 deadtime = strtol(str, &tail, 10);
1420 if (tail == str || deadtime < 0 || deadtime == LONG_MAX)
1421 {
1422 SL_RETURN (-1, _("sh_ext_deadtime"));
1423 }
1424
1425 ext_coms->deadtime = (time_t) deadtime;
1426 SL_RETURN (0, _("sh_ext_deadtime"));
1427}
1428
1429/*
1430 * -- define type
1431 */
1432int sh_ext_type (const char * str)
1433{
1434 SL_ENTER(_("sh_ext_type"));
1435
1436 if (ext_coms == NULL || ext_failed == (-1) || str == NULL)
1437 {
1438 SL_RETURN((-1), _("sh_ext_type"));
1439 }
1440
1441 if (strlen(str) != 3)
1442 {
1443 SL_RETURN((-1), _("sh_ext_type"));
1444 }
1445
1446 set3(ext_coms->type, str[0], str[1], str[2]);
1447
1448 if (str[0] == 'l' && str[1] == 'o' && str[2] == 'g')
1449 ext_coms->tas.rw = 'w';
1450 else if (str[0] == 's' && str[1] == 'r' && str[2] == 'v')
1451 ext_coms->tas.rw = 'w';
1452 else if (str[0] == 'm' && str[1] == 'o' && str[2] == 'n')
1453 ext_coms->tas.rw = 'r';
1454 else
1455 {
1456 SL_RETURN((-1), _("sh_ext_type"));
1457 }
1458
1459 SL_RETURN(0, _("sh_ext_type"));
1460}
1461
1462
1463
1464/*
1465 * -- define checksum
1466 */
1467int sh_ext_checksum (const char * str)
1468{
1469 SL_ENTER(_("sh_ext_checksum"));
1470 if (ext_coms == NULL || ext_failed == (-1) || str == NULL)
1471 {
1472 SL_RETURN((-1), _("sh_ext_checksum"));
1473 }
1474
1475 if (sl_strlen(str) != KEY_LEN)
1476 {
1477 SL_RETURN((-1), _("sh_ext_checksum"));
1478 }
1479
1480 (void) sl_strlcpy (ext_coms->tas.checksum, str, KEY_LEN+1);
1481
1482 SL_RETURN((0), _("sh_ext_checksum"));
1483}
1484
1485/*
1486 * -- choose privileges
1487 */
1488int sh_ext_priv (const char * c)
1489{
1490
1491 uid_t me_uid;
1492 gid_t me_gid;
1493
1494 SL_ENTER(_("sh_ext_priv"));
1495 if (0 == sh_ext_uid (c, &me_uid, &me_gid))
1496 {
1497 ext_coms->tas.run_user_uid = me_uid;
1498 ext_coms->tas.run_user_gid = me_gid;
1499 if (me_uid != (uid_t) 0)
1500 ext_coms->tas.privileged = 0;
1501 SL_RETURN((0), _("sh_ext_priv"));
1502 }
1503
1504 SL_RETURN (-1, _("sh_ext_priv"));
1505}
1506
1507
1508
1509
1510/*
1511 * -- check filters
1512 */
1513static int sh_ext_filter (char * message, sh_com_t * task)
1514{
1515 time_t now_time;
1516
1517 SL_ENTER(_("sh_ext_filter"));
1518
1519 if (task->filter)
1520 {
1521 if (0 != sh_filter_filter (message, task->filter))
1522 {
1523 SL_RETURN ((-1), _("sh_ext_filter"));
1524 }
1525 }
1526
1527 /* Filter passed, check deadtime */
1528
1529 if (task->deadtime != (time_t) 0)
1530 {
1531 now_time = time (NULL);
1532
1533 if (task->last_run == (time_t) 0)
1534 {
1535 task->last_run = now_time;
1536 }
1537 else if ((time_t)(now_time-task->last_run) < task->deadtime)
1538 {
1539 SL_RETURN ((-1), _("sh_ext_filter"));
1540 }
1541 else
1542 {
1543 task->last_run = now_time;
1544 }
1545 }
1546
1547 SL_RETURN ((0), _("sh_ext_filter"));
1548}
1549
1550
1551
1552/*
1553 * -- execute external script/program
1554 */
1555int sh_ext_execute (char t1, char t2, char t3, /*@null@*/char * message,
1556 size_t msg_siz)
1557{
1558 int caperr;
1559 sh_com_t * listval = ext_coms;
1560 int status = 0;
1561 char * tmp;
1562 char errbuf[SH_ERRBUF_SIZE];
1563
1564 static int some_error = 0;
1565
1566 struct sigaction new_act;
1567 struct sigaction old_act;
1568
1569 SL_ENTER(_("sh_ext_execute"));
1570
1571 PDBG_OPEN;
1572
1573 if (listval == NULL || message == NULL)
1574 {
1575 SL_RETURN ((-1), _("sh_ext_execute"));
1576 }
1577
1578 PDBG(-1);
1579
1580 if (msg_siz == 0)
1581 msg_siz = sl_strlen(message);
1582
1583
1584 /* ignore SIGPIPE (instead get EPIPE if connection is closed)
1585 */
1586 new_act.sa_handler = SIG_IGN;
1587 (void) retry_sigaction (FIL__, __LINE__, SIGPIPE, &new_act, &old_act);
1588
1589 while (listval != NULL)
1590 {
1591 PDBG_OPEN;
1592 PDBG(-2);
1593 if (t1 == listval->type[0] &&
1594 t2 == listval->type[1] &&
1595 t3 == listval->type[2] &&
1596 0 == sh_ext_filter (message, listval))
1597 {
1598 PDBG(-3);
1599
1600 if (0 != (caperr = sl_get_cap_sub()))
1601 {
1602 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
1603 sh_error_message (caperr, errbuf, sizeof(errbuf)),
1604 _("sl_get_cap_sub"));
1605 }
1606 if (0 == sh_ext_popen (&(listval->tas)))
1607 {
1608 PDBG_OPEN;
1609 PDBG(-4);
1610 if (NULL != listval->tas.pipe && listval->tas.rw == 'w')
1611 {
1612 PDBG(-5);
1613 if (message != NULL)
1614 {
1615 PDBG(-6);
1616 status = (int) write (listval->tas.pipeFD,
1617 message, msg_siz);
1618 if (status >= 0)
1619 status = (int) write (listval->tas.pipeFD, "\n", 1);
1620 }
1621 PDBG_D(status);
1622 if (status >= 0)
1623 status = (int) write (listval->tas.pipeFD, "[", 1);
1624 PDBG_D(status);
1625 if (status >= 0)
1626 status = (int) write (listval->tas.pipeFD, "E", 1);
1627 PDBG_D(status);
1628 if (status >= 0)
1629 status = (int) write (listval->tas.pipeFD, "O", 1);
1630 PDBG_D(status);
1631 if (status >= 0)
1632 status = (int) write (listval->tas.pipeFD, "F", 1);
1633 PDBG_D(status);
1634 if (status >= 0)
1635 status = (int) write (listval->tas.pipeFD, "]", 1);
1636 PDBG_D(status);
1637 if (status >= 0)
1638 status = (int) write (listval->tas.pipeFD, "\n", 1);
1639 PDBG_D(status);
1640 if (status >= 0)
1641 {
1642 some_error = 0;
1643 }
1644 if ((status < 0) && (some_error == 0))
1645 {
1646 some_error = 1;
1647 PDBG_S("some error");
1648 PDBG_D(status);
1649 tmp = sh_util_safe_name (listval->tas.command);
1650
1651 if (tmp)
1652 {
1653 if (listval->tas.privileged == 0 &&
1654 (0 == getuid() || 0 != sl_is_suid()) )
1655 sh_error_handle((-1), FIL__, __LINE__, 0,
1656 MSG_NOEXEC,
1657 (UID_CAST) listval->tas.run_user_uid,
1658 tmp);
1659 else
1660 sh_error_handle((-1), FIL__, __LINE__, 0,
1661 MSG_NOEXEC,
1662 (UID_CAST) getuid(), tmp);
1663
1664 SH_FREE(tmp);
1665 }
1666
1667 }
1668 PDBG(-7);
1669 (void) fflush(listval->tas.pipe);
1670 }
1671 PDBG(-8);
1672 (void) sh_ext_pclose(&(listval->tas));
1673 }
1674 else
1675 {
1676 PDBG_OPEN;
1677 PDBG_S("0 != sh_ext_popen()");
1678 }
1679 if (0 != (caperr = sl_drop_cap_sub()))
1680 {
1681 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
1682 sh_error_message (caperr, errbuf, sizeof(errbuf)),
1683 _("sl_drop_cap_sub"));
1684 }
1685
1686 }
1687 listval = listval->next;
1688 }
1689 PDBG_OPEN;
1690 PDBG_S("no more commands");
1691
1692 /* restore old signal handler
1693 */
1694 (void) retry_sigaction (FIL__, __LINE__, SIGPIPE, &old_act, NULL);
1695 PDBG_S("return");
1696 PDBG_CLOSE;
1697
1698 SL_RETURN ((0), _("sh_ext_execute"));
1699}
1700
1701
1702/* #if defined(WITH_EXTERNAL) */
1703#endif
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