source: trunk/src/sh_extern.c@ 572

Last change on this file since 572 was 570, checked in by katerina, 3 years ago

Fixes for some compile/cppcheck warnings, version 4.4.6.
File size: 37.4 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 /* cppcheck-suppress syntaxError */
996 --try; retry_msleep(0, 100);
997 }
998 } while (sh_string_len(s) == 0 && try != 0);
999
1000 if (sh_string_len(s) == 0)
1001 {
1002 sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, status, MSG_E_SUBGEN,
1003 _("No output from command"), _("sh_ext_popen_str"));
1004 }
1005
1006 out = sh_util_strdup(sh_string_str(s));
1007 sh_string_destroy(&s);
1008 }
1009
1010 /* restore old signal handler
1011 */
1012 (void) retry_sigaction (FIL__, __LINE__, SIGPIPE, &old_act, NULL);
1013
1014 /* close pipe and return exit status
1015 */
1016 (void) sh_ext_pclose(&task);
1017 sh_ext_tas_free (&task);
1018 SL_RETURN ((out), _("sh_ext_popen_str"));
1019}
1020
1021
1022
1023
1024/* --------------- EXTERN STUFF ------------------- */
1025
1026#if defined(WITH_EXTERNAL)
1027
1028typedef struct _sh_com_t
1029{
1030 char type[4];
1031
1032 sh_filter_type * filter;
1033
1034 time_t deadtime;
1035 time_t last_run;
1036
1037 sh_tas_t tas;
1038
1039 struct _sh_com_t * next;
1040
1041} sh_com_t;
1042
1043
1044static
1045void set3 (char * pos, char c1, char c2, char c3)
1046{
1047 pos[0] = c1;
1048 pos[1] = c2;
1049 pos[2] = c3;
1050 pos[3] = '\0';
1051 return;
1052}
1053
1054
1055
1056/* initialize the external command structure
1057 */
1058static
1059sh_com_t * command_init(void)
1060{
1061 uid_t ff_euid;
1062 sh_com_t * ext_com = NULL;
1063
1064 SL_ENTER(_("command_init"));
1065
1066 ext_com = (sh_com_t *) SH_ALLOC(sizeof(sh_com_t));
1067
1068 if (!ext_com)
1069 {
1070 SL_RETURN( NULL, _("command_init"));
1071 }
1072
1073 sh_ext_tas_init (&(ext_com->tas));
1074
1075 (void) sl_get_euid(&ff_euid);
1076#if 0
1077 ext_com->tas.trusted_users[0] = (uid_t) 0;
1078 ext_com->tas.trusted_users[1] = (uid_t) (ff_euid);
1079#endif
1080
1081 /* ------------------------------------------------- */
1082
1083 set3(ext_com->type, 'l', 'o', 'g');
1084 ext_com->filter = NULL;
1085 ext_com->deadtime = 0;
1086 ext_com->last_run = 0;
1087
1088 ext_com->next = NULL;
1089
1090 SL_RETURN( ext_com, _("command_init"));
1091}
1092
1093/* the list of external commands
1094 */
1095static sh_com_t * ext_coms = NULL;
1096
1097/* if -1, allocation of last command has failed,
1098 * thus don't fill in options
1099 */
1100static int ext_failed = -1;
1101
1102static
1103int sh_ext_add_envv(const char * key, const char * val)
1104{
1105 int retval;
1106
1107 SL_ENTER(_("sh_ext_add_envv"));
1108
1109 if (ext_coms == NULL || ext_failed == (-1) ||
1110 (key == NULL && val == NULL) ||
1111 ext_coms->tas.envc >= 30)
1112 {
1113 SL_RETURN (-1, _("sh_ext_add_envv"));
1114 }
1115
1116 retval = sh_ext_tas_add_envv(&(ext_coms->tas), key, val);
1117
1118 if (retval >= 0)
1119 retval = 0;
1120
1121 SL_RETURN (retval, _("sh_ext_add_envv"));
1122}
1123
1124
1125
1126static
1127int sh_ext_init(const char * command)
1128{
1129 sh_com_t * retval;
1130 size_t size;
1131
1132 SL_ENTER(_("sh_ext_init"));
1133
1134 if (command == NULL)
1135 {
1136 SL_RETURN (-1, _("sh_ext_init"));
1137 }
1138 size = strlen(command);
1139 if (command[0] != '/' || size < 2)
1140 {
1141 SL_RETURN (-1, _("sh_ext_init"));
1142 }
1143
1144 if (NULL == (retval = command_init()))
1145 {
1146 SL_RETURN (-1, _("sh_ext_init"));
1147 }
1148
1149 sh_ext_tas_command(&(retval->tas), command);
1150
1151 if (sh.timezone != NULL)
1152 {
1153 (void) sh_ext_add_envv( "TZ", sh.timezone);
1154 }
1155
1156 retval->next = ext_coms;
1157 ext_coms = retval;
1158 SL_RETURN (0, _("sh_ext_init"));
1159}
1160
1161static
1162int sh_ext_uid (const char * user, /*@out@*/uid_t * uid, /*@out@*/gid_t * gid)
1163{
1164 struct passwd * tempres;
1165#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1166 struct passwd pwd;
1167 char * buffer = SH_ALLOC(SH_PWBUF_SIZE);
1168#endif
1169
1170 SL_ENTER(_("sh_ext_uid"));
1171
1172 *uid = (uid_t)-1; *gid = (gid_t)-1;
1173
1174 if (user == NULL)
1175 {
1176#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1177 SH_FREE(buffer);
1178#endif
1179 SL_RETURN (-1, _("sh_ext_uid"));
1180 }
1181
1182#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1183 sh_getpwnam_r(user, &pwd, buffer, SH_PWBUF_SIZE, &tempres);
1184#else
1185 tempres = sh_getpwnam(user);
1186#endif
1187
1188 if (NULL != tempres)
1189 {
1190 *uid = tempres->pw_uid;
1191 *gid = tempres->pw_gid;
1192#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1193 SH_FREE(buffer);
1194#endif
1195 SL_RETURN (0, _("sh_ext_uid"));
1196 }
1197
1198#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1199 SH_FREE(buffer);
1200#endif
1201 SL_RETURN (-1, _("sh_ext_uid"));
1202}
1203
1204
1205static
1206int sh_ext_add (const char * argstring, int * ntok, char * stok[])
1207{
1208 int i = 0;
1209 size_t s;
1210 char * p;
1211 char * new;
1212 size_t len;
1213
1214 SL_ENTER(_("sh_ext_add"));
1215
1216 if (NULL == argstring)
1217 {
1218 SL_RETURN((-1), _("sh_ext_add"));
1219 }
1220
1221 len = strlen(argstring) + 1;
1222 new = SH_ALLOC(len);
1223 sl_strlcpy(new, argstring, len);
1224
1225 do
1226 {
1227#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1228 char * saveptr;
1229 if (i == 0)
1230 p = strtok_r (new, ", \t", &saveptr);
1231 else
1232 p = strtok_r (NULL, ", \t", &saveptr);
1233#else
1234 if (i == 0)
1235 p = strtok (new, ", \t");
1236 else
1237 p = strtok (NULL, ", \t");
1238#endif
1239
1240 if (p == NULL)
1241 break;
1242
1243 s = strlen(p) + 1;
1244 if (stok[i] != NULL)
1245 SH_FREE(stok[i]);
1246 stok[i] = SH_ALLOC(s);
1247 (void) sl_strlcpy(stok[i], p, s);
1248
1249 ++i;
1250 if (i == 30)
1251 break;
1252 }
1253 while (p != NULL);
1254
1255 *ntok = i;
1256 SH_FREE(new);
1257
1258 SL_RETURN (0, _("sh_ext_add"));
1259}
1260
1261/*********************************************************
1262 *
1263 * Public functions
1264 *
1265 *
1266 *********************************************************/
1267
1268/*
1269 * -- start a new external command, and add it to the list
1270 */
1271int sh_ext_setcommand(const char * cmd)
1272{
1273 int i;
1274
1275 SL_ENTER(_("sh_ext_setcommand"));
1276 if ( (i = sh_ext_init(cmd)) < 0)
1277 ext_failed = -1;
1278 else
1279 ext_failed = 0;
1280 SL_RETURN( i, _("sh_ext_setcommand"));
1281}
1282
1283
1284/*
1285 * -- clean up the command list
1286 */
1287int sh_ext_cleanup(void)
1288{
1289 sh_com_t * retval;
1290
1291 SL_ENTER(_("sh_ext_cleanup"));
1292
1293 while (ext_coms != NULL)
1294 {
1295 retval = ext_coms;
1296 ext_coms = retval->next;
1297
1298 sh_ext_tas_free (&(retval->tas));
1299
1300 if (retval->filter)
1301 sh_filter_free (retval->filter);
1302
1303 SH_FREE(retval);
1304
1305 }
1306
1307 SL_RETURN (0, _("sh_ext_cleanup"));
1308}
1309
1310/*
1311 * -- explicitely close a command
1312 */
1313int sh_ext_close_command (const char * str)
1314{
1315 (void) str;
1316 if (ext_coms == NULL || ext_failed == (-1))
1317 return (-1);
1318 ext_failed = (-1);
1319 return 0;
1320}
1321
1322/*
1323 * -- add keywords to the OR filter
1324 */
1325int sh_ext_add_or (const char * str)
1326{
1327 if (ext_coms == NULL || ext_failed == (-1))
1328 return (-1);
1329 if (ext_coms->filter == NULL)
1330 ext_coms->filter = sh_filter_alloc();
1331 return (sh_filter_add(str, ext_coms->filter, SH_FILT_OR));
1332}
1333
1334/*
1335 * -- add keywords to the AND filter
1336 */
1337int sh_ext_add_and (const char * str)
1338{
1339 if (ext_coms == NULL || ext_failed == (-1))
1340 return (-1);
1341 if (ext_coms->filter == NULL)
1342 ext_coms->filter = sh_filter_alloc();
1343 return (sh_filter_add(str, ext_coms->filter, SH_FILT_AND));
1344}
1345
1346/*
1347 * -- add keywords to the NOT filter
1348 */
1349int sh_ext_add_not (const char * str)
1350{
1351 if (ext_coms == NULL || ext_failed == (-1))
1352 return (-1);
1353 if (ext_coms->filter == NULL)
1354 ext_coms->filter = sh_filter_alloc();
1355 return (sh_filter_add(str, ext_coms->filter, SH_FILT_NOT));
1356}
1357
1358/*
1359 * -- add keywords to the CL argument list
1360 */
1361int sh_ext_add_argv (const char * str)
1362{
1363 if (ext_coms == NULL || ext_failed == (-1))
1364 return (-1);
1365 return (sh_ext_add (str, &(ext_coms->tas.argc), ext_coms->tas.argv));
1366}
1367
1368/*
1369 * -- add a path to the environment
1370 */
1371int sh_ext_add_default (const char * dummy)
1372{
1373 char * p = NULL;
1374 int i;
1375 char dir[SH_PATHBUF];
1376
1377 SL_ENTER(_("sh_ext_add_default"));
1378 if (dummy[0] == 'n' || dummy[0] == 'N' ||
1379 dummy[0] == 'f' || dummy[0] == 'F' || dummy[0] == '0')
1380 {
1381 SL_RETURN(0, _("sh_ext_add_default"));
1382 }
1383 p = sh_unix_getUIDdir (SH_ERR_ERR, (uid_t) ext_coms->tas.run_user_uid,
1384 dir, sizeof(dir));
1385 if (p)
1386 (void) sh_ext_add_envv (_("HOME"), p);
1387 (void) sh_ext_add_envv (_("SHELL"), _("/bin/sh"));
1388 (void) sh_ext_add_envv (_("PATH"), _("/sbin:/bin:/usr/sbin:/usr/bin"));
1389 (void) sh_ext_add_envv (_("IFS"), " \n\t");
1390 i = (p == NULL ? (-1) : 0);
1391 SL_RETURN(i, _("sh_ext_add_default"));
1392}
1393
1394/*
1395 * -- add an environment variable
1396 */
1397int sh_ext_add_environ (const char * str)
1398{
1399 int i;
1400
1401 SL_ENTER(_("sh_ext_add_environ"));
1402 i = sh_ext_add_envv (NULL, str);
1403 SL_RETURN(i, _("sh_ext_add_environ"));
1404}
1405
1406/*
1407 * -- set deadtime
1408 */
1409int sh_ext_deadtime (const char * str)
1410{
1411 long deadtime = 0;
1412 char * tail = NULL;
1413
1414 SL_ENTER(_("sh_ext_deadtime"));
1415
1416 if (ext_coms == NULL || ext_failed == (-1) || str == NULL)
1417 {
1418 SL_RETURN (-1, _("sh_ext_deadtime"));
1419 }
1420 deadtime = strtol(str, &tail, 10);
1421 if (tail == str || deadtime < 0 || deadtime == LONG_MAX)
1422 {
1423 SL_RETURN (-1, _("sh_ext_deadtime"));
1424 }
1425
1426 ext_coms->deadtime = (time_t) deadtime;
1427 SL_RETURN (0, _("sh_ext_deadtime"));
1428}
1429
1430/*
1431 * -- define type
1432 */
1433int sh_ext_type (const char * str)
1434{
1435 SL_ENTER(_("sh_ext_type"));
1436
1437 if (ext_coms == NULL || ext_failed == (-1) || str == NULL)
1438 {
1439 SL_RETURN((-1), _("sh_ext_type"));
1440 }
1441
1442 if (strlen(str) != 3)
1443 {
1444 SL_RETURN((-1), _("sh_ext_type"));
1445 }
1446
1447 set3(ext_coms->type, str[0], str[1], str[2]);
1448
1449 if (str[0] == 'l' && str[1] == 'o' && str[2] == 'g')
1450 ext_coms->tas.rw = 'w';
1451 else if (str[0] == 's' && str[1] == 'r' && str[2] == 'v')
1452 ext_coms->tas.rw = 'w';
1453 else if (str[0] == 'm' && str[1] == 'o' && str[2] == 'n')
1454 ext_coms->tas.rw = 'r';
1455 else
1456 {
1457 SL_RETURN((-1), _("sh_ext_type"));
1458 }
1459
1460 SL_RETURN(0, _("sh_ext_type"));
1461}
1462
1463
1464
1465/*
1466 * -- define checksum
1467 */
1468int sh_ext_checksum (const char * str)
1469{
1470 SL_ENTER(_("sh_ext_checksum"));
1471 if (ext_coms == NULL || ext_failed == (-1) || str == NULL)
1472 {
1473 SL_RETURN((-1), _("sh_ext_checksum"));
1474 }
1475
1476 if (sl_strlen(str) != KEY_LEN)
1477 {
1478 SL_RETURN((-1), _("sh_ext_checksum"));
1479 }
1480
1481 (void) sl_strlcpy (ext_coms->tas.checksum, str, KEY_LEN+1);
1482
1483 SL_RETURN((0), _("sh_ext_checksum"));
1484}
1485
1486/*
1487 * -- choose privileges
1488 */
1489int sh_ext_priv (const char * c)
1490{
1491
1492 uid_t me_uid;
1493 gid_t me_gid;
1494
1495 SL_ENTER(_("sh_ext_priv"));
1496 if (0 == sh_ext_uid (c, &me_uid, &me_gid))
1497 {
1498 ext_coms->tas.run_user_uid = me_uid;
1499 ext_coms->tas.run_user_gid = me_gid;
1500 if (me_uid != (uid_t) 0)
1501 ext_coms->tas.privileged = 0;
1502 SL_RETURN((0), _("sh_ext_priv"));
1503 }
1504
1505 SL_RETURN (-1, _("sh_ext_priv"));
1506}
1507
1508
1509
1510
1511/*
1512 * -- check filters
1513 */
1514static int sh_ext_filter (char * message, sh_com_t * task)
1515{
1516 time_t now_time;
1517
1518 SL_ENTER(_("sh_ext_filter"));
1519
1520 if (task->filter)
1521 {
1522 if (0 != sh_filter_filter (message, task->filter))
1523 {
1524 SL_RETURN ((-1), _("sh_ext_filter"));
1525 }
1526 }
1527
1528 /* Filter passed, check deadtime */
1529
1530 if (task->deadtime != (time_t) 0)
1531 {
1532 now_time = time (NULL);
1533
1534 if (task->last_run == (time_t) 0)
1535 {
1536 task->last_run = now_time;
1537 }
1538 else if ((time_t)(now_time-task->last_run) < task->deadtime)
1539 {
1540 SL_RETURN ((-1), _("sh_ext_filter"));
1541 }
1542 else
1543 {
1544 task->last_run = now_time;
1545 }
1546 }
1547
1548 SL_RETURN ((0), _("sh_ext_filter"));
1549}
1550
1551
1552
1553/*
1554 * -- execute external script/program
1555 */
1556int sh_ext_execute (char t1, char t2, char t3, /*@null@*/char * message,
1557 size_t msg_siz)
1558{
1559 int caperr;
1560 sh_com_t * listval = ext_coms;
1561 int status = 0;
1562 char * tmp;
1563 char errbuf[SH_ERRBUF_SIZE];
1564
1565 static int some_error = 0;
1566
1567 struct sigaction new_act;
1568 struct sigaction old_act;
1569
1570 SL_ENTER(_("sh_ext_execute"));
1571
1572 PDBG_OPEN;
1573
1574 if (listval == NULL || message == NULL)
1575 {
1576 SL_RETURN ((-1), _("sh_ext_execute"));
1577 }
1578
1579 PDBG(-1);
1580
1581 if (msg_siz == 0)
1582 msg_siz = sl_strlen(message);
1583
1584
1585 /* ignore SIGPIPE (instead get EPIPE if connection is closed)
1586 */
1587 new_act.sa_handler = SIG_IGN;
1588 (void) retry_sigaction (FIL__, __LINE__, SIGPIPE, &new_act, &old_act);
1589
1590 while (listval != NULL)
1591 {
1592 PDBG_OPEN;
1593 PDBG(-2);
1594 if (t1 == listval->type[0] &&
1595 t2 == listval->type[1] &&
1596 t3 == listval->type[2] &&
1597 0 == sh_ext_filter (message, listval))
1598 {
1599 PDBG(-3);
1600
1601 if (0 != (caperr = sl_get_cap_sub()))
1602 {
1603 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
1604 sh_error_message (caperr, errbuf, sizeof(errbuf)),
1605 _("sl_get_cap_sub"));
1606 }
1607 if (0 == sh_ext_popen (&(listval->tas)))
1608 {
1609 PDBG_OPEN;
1610 PDBG(-4);
1611 if (NULL != listval->tas.pipe && listval->tas.rw == 'w')
1612 {
1613 PDBG(-5);
1614 if (message != NULL)
1615 {
1616 PDBG(-6);
1617 status = (int) write (listval->tas.pipeFD,
1618 message, msg_siz);
1619 if (status >= 0)
1620 status = (int) write (listval->tas.pipeFD, "\n", 1);
1621 }
1622 PDBG_D(status);
1623 if (status >= 0)
1624 status = (int) write (listval->tas.pipeFD, "[", 1);
1625 PDBG_D(status);
1626 if (status >= 0)
1627 status = (int) write (listval->tas.pipeFD, "E", 1);
1628 PDBG_D(status);
1629 if (status >= 0)
1630 status = (int) write (listval->tas.pipeFD, "O", 1);
1631 PDBG_D(status);
1632 if (status >= 0)
1633 status = (int) write (listval->tas.pipeFD, "F", 1);
1634 PDBG_D(status);
1635 if (status >= 0)
1636 status = (int) write (listval->tas.pipeFD, "]", 1);
1637 PDBG_D(status);
1638 if (status >= 0)
1639 status = (int) write (listval->tas.pipeFD, "\n", 1);
1640 PDBG_D(status);
1641 if (status >= 0)
1642 {
1643 some_error = 0;
1644 }
1645 if ((status < 0) && (some_error == 0))
1646 {
1647 some_error = 1;
1648 PDBG_S("some error");
1649 PDBG_D(status);
1650 tmp = sh_util_safe_name (listval->tas.command);
1651
1652 if (tmp)
1653 {
1654 if (listval->tas.privileged == 0 &&
1655 (0 == getuid() || 0 != sl_is_suid()) )
1656 sh_error_handle((-1), FIL__, __LINE__, 0,
1657 MSG_NOEXEC,
1658 (UID_CAST) listval->tas.run_user_uid,
1659 tmp);
1660 else
1661 sh_error_handle((-1), FIL__, __LINE__, 0,
1662 MSG_NOEXEC,
1663 (UID_CAST) getuid(), tmp);
1664
1665 SH_FREE(tmp);
1666 }
1667
1668 }
1669 PDBG(-7);
1670 (void) fflush(listval->tas.pipe);
1671 }
1672 PDBG(-8);
1673 (void) sh_ext_pclose(&(listval->tas));
1674 }
1675 else
1676 {
1677 PDBG_OPEN;
1678 PDBG_S("0 != sh_ext_popen()");
1679 }
1680 if (0 != (caperr = sl_drop_cap_sub()))
1681 {
1682 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
1683 sh_error_message (caperr, errbuf, sizeof(errbuf)),
1684 _("sl_drop_cap_sub"));
1685 }
1686
1687 }
1688 listval = listval->next;
1689 }
1690 PDBG_OPEN;
1691 PDBG_S("no more commands");
1692
1693 /* restore old signal handler
1694 */
1695 (void) retry_sigaction (FIL__, __LINE__, SIGPIPE, &old_act, NULL);
1696 PDBG_S("return");
1697 PDBG_CLOSE;
1698
1699 SL_RETURN ((0), _("sh_ext_execute"));
1700}
1701
1702
1703/* #if defined(WITH_EXTERNAL) */
1704#endif
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