source: trunk/src/sh_entropy.c@ 247

Last change on this file since 247 was 235, checked in by katerina, 15 years ago

Fix for potential deadlock when calling external programm (ticket #155).
File size: 22.4 KB
Line 
1/* SAMHAIN file system integrity testing */
2/* Copyright (C) 1999, 2000 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#include <stdio.h>
24#include <string.h>
25
26#include <sys/types.h>
27
28#ifdef HAVE_MEMORY_H
29#include <memory.h>
30#endif
31
32#if TIME_WITH_SYS_TIME
33#include <sys/time.h>
34#include <time.h>
35#else
36#if HAVE_SYS_TIME_H
37#include <sys/time.h>
38#else
39#include <time.h>
40#endif
41#endif
42
43
44#include <stdlib.h>
45#include <pwd.h>
46#include <unistd.h>
47#include <fcntl.h>
48#include <signal.h>
49#include <sys/stat.h>
50#include <errno.h>
51#include <sys/wait.h>
52
53
54#ifdef HAVE_SYS_SELECT_H
55#include <sys/select.h>
56#endif
57#include <sys/types.h>
58
59
60
61#include "samhain.h"
62#include "sh_utils.h"
63#include "sh_unix.h"
64#include "sh_tiger.h"
65#include "sh_calls.h"
66
67#undef FIL__
68#define FIL__ _("sh_entropy.c")
69
70#if defined (HAVE_EGD_RANDOM)
71/* rndegd.c - interface to the EGD
72 * Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
73 */
74#include <stddef.h>
75#include <sys/socket.h>
76#include <sys/un.h>
77
78static int
79do_write( int fd, void *buf, size_t nbytes )
80{
81 size_t nleft = nbytes;
82 int nwritten;
83
84 while( nleft > 0 ) {
85 nwritten = write( fd, buf, nleft);
86 if( nwritten < 0 ) {
87 if( errno == EINTR )
88 continue;
89 return -1;
90 }
91 nleft -= nwritten;
92 buf = (char*)buf + nwritten;
93 }
94 return 0;
95}
96
97static int
98do_read( int fd, void *buf, int nbytes )
99{
100 int n, nread = 0;
101
102 if (nbytes < 0)
103 return 0;
104
105 do {
106 do {
107 n = read(fd, (char*)buf + nread, nbytes );
108 } while( n == -1 && errno == EINTR );
109 if( n == -1 )
110 return -1;
111 nread += n;
112 } while( nread < nbytes );
113 return nbytes;
114}
115
116
117int sh_entropy(int getbytes, char * nbuf)
118{
119 int fd = -1;
120 int n;
121 byte buffer[256+2];
122 int nbytes;
123 int do_restart = 0;
124 int myerror = 0;
125 int length;
126 char * p = nbuf;
127 int i;
128
129 SL_ENTER(_("sh_entropy"));
130
131 if( getbytes <= 0)
132 SL_RETURN( -1, _("sh_entropy"));
133 if (getbytes > KEY_BYT)
134 getbytes = KEY_BYT;
135 length = getbytes;
136
137 restart:
138 if( do_restart ) {
139 if( fd != -1 ) {
140 close( fd );
141 fd = -1;
142 }
143 }
144 if( fd == -1 ) {
145 const char *bname = NULL;
146 char *name;
147 struct sockaddr_un addr;
148 int addr_len;
149 int retval;
150
151#ifdef EGD_SOCKET_NAME
152 bname = EGD_SOCKET_NAME;
153#endif
154 if ( !bname || !*bname )
155 bname = _("=entropy");
156
157 if ( *bname == '=' && bname[1] )
158 name = sh_util_strconcat ( DEFAULT_DATAROOT, "/", bname+1 , NULL );
159 else
160 name = sh_util_strconcat ( bname , NULL );
161
162 if ( strlen(name)+1 >= sizeof(addr.sun_path) )
163 {
164 sh_error_handle ((-1), FIL__, __LINE__, ENAMETOOLONG, MSG_E_SUBGEN,
165 _("EGD socketname is too long"),
166 _("sh_entropy") );
167 SH_FREE(name);
168 SL_RETURN( -1, _("sh_entropy") );
169 }
170
171 memset( &addr, 0, sizeof(addr) );
172 addr.sun_family = AF_UNIX;
173 sl_strlcpy( addr.sun_path, name, sizeof(addr.sun_path) );
174 addr_len = offsetof( struct sockaddr_un, sun_path )
175 + strlen( addr.sun_path );
176
177 fd = socket(AF_UNIX, SOCK_STREAM, 0);
178 if( fd == -1 )
179 {
180 myerror = errno;
181 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
182 _("cannot create unix domain socket"),
183 _("sh_entropy") );
184 SH_FREE(name);
185 SL_RETURN( -1, _("sh_entropy") );
186 }
187 do {
188 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
189 } while (retval < 0 && (errno == EINTR || errno == EINPROGRESS));
190 if( retval == -1 )
191 {
192 myerror = errno;
193 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
194 _("cannot connect to unix domain socket"),
195 _("sh_entropy") );
196 SH_FREE(name);
197 close(fd);
198 SL_RETURN( -1, _("sh_entropy") );
199 }
200 SH_FREE(name);
201 }
202 do_restart = 0;
203
204 nbytes = length < 255? length : 255;
205 /* first time we do it with a non blocking request */
206 buffer[0] = 1; /* non blocking */
207 buffer[1] = nbytes;
208 if( do_write( fd, buffer, 2 ) == -1 )
209 {
210 myerror = errno;
211 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
212 _("cannot write to EGD"),
213 _("sh_entropy") );
214 close(fd);
215 SL_RETURN( -1, _("sh_entropy") );
216 }
217 n = do_read( fd, buffer, 1 );
218 if( n == -1 ) {
219 myerror = errno;
220 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror, MSG_E_SUBGEN,
221 _("read error on EGD"),
222 _("sh_entropy") );
223 do_restart = 1;
224 goto restart;
225 }
226 n = buffer[0];
227 if( n ) {
228 n = do_read( fd, buffer, n );
229 if( n == -1 ) {
230 myerror = errno;
231 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror,MSG_E_SUBGEN,
232 _("read error on EGD"),
233 _("sh_entropy") );
234 do_restart = 1;
235 goto restart;
236 }
237 for (i = 0; i < n; ++i)
238 {
239 if (getbytes >= 0)
240 { *p = buffer[i]; ++p; --getbytes; }
241 }
242 length -= n;
243 }
244
245 while( length ) {
246 nbytes = length < 255? length : 255;
247
248 buffer[0] = 2; /* blocking */
249 buffer[1] = nbytes;
250 if( do_write( fd, buffer, 2 ) == -1 )
251 {
252 myerror = errno;
253 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
254 _("cannot write to EGD"),
255 _("sh_entropy") );
256 close(fd);
257 SL_RETURN( -1, _("sh_entropy") );
258 }
259 n = do_read( fd, buffer, nbytes );
260 if( n == -1 ) {
261 myerror = errno;
262 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror,MSG_E_SUBGEN,
263 _("read error on EGD"),
264 _("sh_entropy") );
265 do_restart = 1;
266 goto restart;
267 }
268 for (i = 0; i < n; ++i)
269 {
270 if (getbytes >= 0)
271 { *p = buffer[i]; ++p; --getbytes; }
272 }
273 length -= n;
274 }
275 memset(buffer, 0, sizeof(buffer) );
276 close(fd);
277 SL_RETURN( 0, _("sh_entropy") ); /* success */
278}
279
280/* HAVE_EGD_RANDOM */
281#endif
282
283#if defined (HAVE_URANDOM)
284
285#include "sh_pthread.h"
286
287int read_mbytes(int timeout_val, const char * path, char * nbuf, int nbytes)
288{
289 int m_count;
290 int fd2;
291
292 SL_ENTER(_("read_mbytes"));
293
294 if ((fd2 = aud_open (FIL__, __LINE__, SL_NOPRIV, path, O_RDONLY, 0)) >= 0)
295 {
296 /* Test whether file is a character device, and is
297 * readable.
298 */
299 if (0 == sh_unix_device_readable(fd2))
300 {
301 m_count = sl_read_timeout_fd(fd2, nbuf, nbytes,
302 timeout_val, SL_FALSE);
303 if (m_count < 0)
304 m_count = 0;
305 }
306 else
307 m_count = 0;
308 }
309 else
310 m_count = 0;
311
312 close(fd2);
313
314 TPT((0, FIL__, __LINE__, _("msg=<read_mbytes: OK>\n")));
315 SL_RETURN(m_count, _("read_mbytes"));
316}
317
318/* Read nbytes bytes from /dev/random, mix them with
319 * previous reads using a hash function, and give out
320 * nbytes bytes from the result.
321 */
322int sh_entropy(int nbytes, char * nbuf)
323{
324 int i, m_count = 0;
325 char * keybuf;
326 UINT32 kbuf[KEY_BYT/sizeof(UINT32)];
327 char addbuf[2 * KEY_BYT];
328
329 SL_ENTER(_("sh_entropy"));
330
331 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
332
333 if (nbytes > KEY_BYT)
334 nbytes = KEY_BYT;
335
336 memset(nbuf, '\0', nbytes);
337
338#ifdef NAME_OF_DEV_URANDOM
339 m_count = read_mbytes ( 1, NAME_OF_DEV_RANDOM, nbuf, nbytes);
340#else
341 m_count = read_mbytes (300, NAME_OF_DEV_RANDOM, nbuf, nbytes);
342#endif
343
344 if (m_count == 0)
345 {
346#ifdef NAME_OF_DEV_URANDOM
347 sh_error_handle (SH_ERR_NOTICE, FIL__, __LINE__, EIO, MSG_NODEV,
348 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
349#else
350 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
351 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
352#endif
353 }
354
355#ifdef NAME_OF_DEV_URANDOM
356 if (m_count < nbytes)
357 {
358 i = read_mbytes(30, NAME_OF_DEV_URANDOM, &nbuf[m_count], nbytes-m_count);
359 if (i == 0)
360 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
361 (long) sh.real.uid, NAME_OF_DEV_URANDOM);
362 else
363 m_count += i;
364 }
365#endif
366
367
368 if (m_count > 0)
369 {
370 /* -- Add previous entropy into the new pool. --
371 */
372 memset(addbuf, '\0', sizeof(addbuf));
373 for (i = 0; i < m_count; ++i)
374 addbuf[i] = nbuf[i];
375 for (i = 0; i < KEY_BYT; ++i)
376 addbuf[i+KEY_BYT] = skey->poolv[i];
377 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
378 TIGER_DATA, 2 * KEY_BYT,
379 kbuf, KEY_BYT/sizeof(UINT32));
380 memset(addbuf, '\0', sizeof(addbuf));
381
382 /* -- Give out nbytes bytes from the new pool. --
383 */
384 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
385 for (i = 0; i < KEY_BYT; ++i)
386 {
387 skey->poolv[i] = keybuf[i];
388 if (i < nbytes)
389 nbuf[i] = keybuf[i];
390 }
391 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
392 memset (keybuf, '\0', KEY_BYT);
393 memset (kbuf, '\0', sizeof(kbuf));
394
395 SL_RETURN(0, _("sh_entropy"));
396 }
397 else
398 {
399 SL_RETURN((-1), _("sh_entropy"));
400 }
401}
402
403/* HAVE_URANDOM */
404#endif
405
406#ifdef HAVE_UNIX_RANDOM
407
408#ifndef FD_SET
409#define NFDBITS 32
410#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
411#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
412#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
413#endif /* !FD_SET */
414#ifndef FD_SETSIZE
415#define FD_SETSIZE 32
416#endif
417#ifndef FD_ZERO
418#define FD_ZERO(p) memset((char *)(p), '\0', sizeof(*(p)))
419#endif
420
421#include "sh_static.h"
422#include "sh_pthread.h"
423
424static
425char * com_path[] = {
426 N_("/usr/bin/xpg4/"),
427 N_("/usr/ucb/"),
428 N_("/bin/"),
429 N_("/sbin/"),
430 N_("/usr/bin/"),
431 N_("/usr/sbin/"),
432 N_("/usr/local/bin/"),
433 NULL
434};
435
436
437typedef struct {
438 char * command;
439 char * arg;
440 int pipeFD;
441 pid_t pid;
442 int isset;
443 FILE * pipe;
444} sourcetable_t;
445
446static
447sourcetable_t source_template[] = {
448 { N_("w"),
449 N_("w"),
450 0,
451 0,
452 0,
453 NULL },
454 { N_("netstat"),
455 N_("netstat -n"),
456 0,
457 0,
458 0,
459 NULL },
460 { N_("ps"),
461 N_("ps -ef"),
462 0,
463 0,
464 0,
465 NULL },
466 { N_("arp"),
467 N_("arp -a"),
468 0,
469 0,
470 0,
471 NULL },
472 { N_("free"),
473 N_("free"),
474 0,
475 0,
476 0,
477 NULL },
478 { N_("uptime"),
479 N_("uptime"),
480 0,
481 0,
482 0,
483 NULL },
484 { N_("procinfo"),
485 N_("procinfo -a"),
486 0,
487 0,
488 0,
489 NULL },
490 { N_("vmstat"),
491 N_("vmstat"),
492 0,
493 0,
494 0,
495 NULL },
496 { N_("w"), /* Play it again, Sam. */
497 N_("w"),
498 0,
499 0,
500 0,
501 NULL },
502 { NULL,
503 NULL,
504 0,
505 0,
506 0,
507 NULL }
508};
509
510
511static FILE * sh_popen (sourcetable_t *source, char * command)
512{
513 int i;
514 int pipedes[2];
515 FILE *outf = NULL;
516 char * arg[4];
517 char * envp[2];
518 size_t len;
519 char arg0[80];
520 char arg1[80];
521
522 SL_ENTER(_("sh_popen"));
523
524 strncpy (arg0, _("/bin/sh"), sizeof(arg0));
525 arg[0] = arg0;
526 strncpy (arg1, _("-c"), sizeof(arg1));
527 arg[1] = arg1;
528 arg[2] = command;
529 arg[3] = NULL;
530
531 if (sh.timezone != NULL)
532 {
533 len = sl_strlen(sh.timezone) + 4;
534 envp[0] = malloc (len); /* free() ok */
535 if (envp[0] != NULL)
536 sl_snprintf (envp[0], len, "TZ=%s", sh.timezone);
537 else
538 envp[0] = NULL;
539 envp[1] = NULL;
540 }
541 else
542 {
543 envp[0] = NULL;
544 }
545
546
547 /* Create the pipe
548 */
549 if (aud_pipe(FIL__, __LINE__, pipedes) < 0) {
550 if (envp[0] != NULL) free(envp[0]);
551 SL_RETURN(NULL, _("sh_popen"));
552 }
553
554 fflush (NULL);
555
556 source->pid = aud_fork(FIL__, __LINE__);
557
558 /* Failure
559 */
560 if (source->pid == (pid_t) - 1) {
561 close(pipedes[0]);
562 close(pipedes[1]);
563 if (envp[0] != NULL) free(envp[0]);
564 SL_RETURN(NULL, _("sh_popen"));
565 }
566
567 if (source->pid == (pid_t) 0)
568 {
569 int val_return;
570
571 /* child - make read side of the pipe stdout
572 */
573 do {
574 val_return = dup2 (pipedes[STDOUT_FILENO], STDOUT_FILENO);
575 } while (val_return < 0 && errno == EINTR);
576
577 if (val_return < 0)
578 _exit(EXIT_FAILURE);
579
580 /* close the pipe descriptors
581 */
582 close (pipedes[STDIN_FILENO]);
583 close (pipedes[STDOUT_FILENO]);
584
585 /* don't leak file descriptors
586 */
587 sh_unix_closeall (3, -1, SL_TRUE); /* in child process */
588
589 /* zero priv info
590 */
591 memset(skey, 0, sizeof(sh_key_t));
592
593 /* drop root privileges
594 */
595 i = 0;
596 if (0 == geteuid())
597 {
598#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
599 struct passwd pwd;
600 char * buffer = SH_ALLOC(SH_PWBUF_SIZE);
601 struct passwd * tempres;
602 sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, SH_PWBUF_SIZE, &tempres);
603#else
604 struct passwd * tempres = sh_getpwnam(DEFAULT_IDENT);
605#endif
606
607 if (NULL != tempres) {
608 i = setgid(tempres->pw_gid);
609 if (i == 0)
610 i = sh_unix_initgroups(DEFAULT_IDENT ,tempres->pw_gid);
611 if (i == 0)
612 i = setuid(tempres->pw_uid);
613 /* make sure we cannot get root again
614 */
615 if ((tempres->pw_uid != 0) &&
616 (setuid(0) >= 0))
617 i = -1;
618 } else {
619 i = -1;
620 }
621#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
622 SH_FREE(buffer);
623#endif
624 }
625
626 /* some problem ...
627 */
628 if (i == -1) {
629 _exit(EXIT_FAILURE);
630 }
631
632 if (NULL != freopen (_("/dev/null"), "r+", stderr))
633 {
634
635 /* exec the program */
636 do {
637 val_return = execve (_("/bin/sh"), arg, envp);
638 } while (val_return < 0 && errno == EINTR);
639 }
640
641 /* failed
642 */
643 _exit(EXIT_FAILURE);
644 }
645
646 /* parent
647 */
648 if (envp[0] != NULL)
649 free(envp[0]);
650
651 close (pipedes[STDOUT_FILENO]);
652 retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
653
654 outf = fdopen (pipedes[STDIN_FILENO], "r");
655
656 if (outf == NULL)
657 {
658 aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
659 close (pipedes[STDOUT_FILENO]);
660 waitpid (source->pid, NULL, 0);
661 source->pid = 0;
662 SL_RETURN(NULL, _("sh_popen"));
663 }
664
665 SL_RETURN(outf, _("sh_popen"));
666}
667
668
669static int sh_pclose (sourcetable_t *source)
670{
671 int status = 0;
672 int retval;
673 char msg[128];
674 char errbuf[SH_ERRBUF_SIZE];
675
676 SL_ENTER(_("sh_pclose"));
677
678 retval = fclose(source->pipe);
679 if (retval)
680 {
681 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
682 MSG_E_SUBGEN,
683 sh_error_message(retval, errbuf, sizeof(errbuf)),
684 _("sh_pclose"));
685 SL_RETURN((-1), _("sh_pclose"));
686 }
687
688 retval = waitpid(source->pid, &status, 0);
689 if (retval != source->pid)
690 {
691 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
692 MSG_E_SUBGEN,
693 sh_error_message(retval, errbuf, sizeof(errbuf)),
694 _("sh_pclose"));
695
696 status = -1;
697 }
698#if !defined(USE_UNO)
699 else if (WIFSIGNALED(status))
700 {
701 sl_snprintf(msg, sizeof(msg), _("Subprocess terminated by signal %d"),
702 WTERMSIG(status));
703 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
704 MSG_E_SUBGEN,
705 msg,
706 _("sh_pclose"));
707 status = -1;
708 }
709#endif
710
711 source->pipe = NULL;
712 source->pid = 0;
713 SL_RETURN(status, _("sh_pclose"));
714}
715
716#define BUF_ENT 32766
717
718/* Poll the system for randomness, mix results with
719 * previous reads using a hash function, and give out
720 * nbytes bytes from the result.
721 */
722int sh_entropy(int nbytes, char * nbuf)
723{
724 int caperr;
725 char combuf[80];
726 char * buffer;
727 int i, j, icount;
728 int bufcount = 0;
729 int count;
730
731 char * keybuf;
732 UINT32 kbuf[KEY_BYT/sizeof(UINT32)];
733 char addbuf[2 * KEY_BYT];
734
735 struct timeval tv;
736 fd_set fds;
737 unsigned long select_now = 0;
738 int maxFD = 0;
739 int imax, selcount;
740 char errbuf[SH_ERRBUF_SIZE];
741
742 sourcetable_t *source = NULL;
743
744 SL_ENTER(_("sh_entropy"));
745
746 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
747
748 if (nbytes > KEY_BYT)
749 nbytes = KEY_BYT;
750
751
752 /* --- If there is entropy in the pool, return it. ---
753 */
754 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
755 if (skey->poolc >= nbytes)
756 {
757 j = KEY_BYT - skey->poolc;
758 for (i = 0; i < nbytes; ++i)
759 {
760 nbuf[i] = skey->poolv[i+j];
761 --skey->poolc;
762 }
763 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey); /* alternative path */
764 SL_RETURN(0, _("sh_entropy"));
765 }
766 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
767
768
769 FD_ZERO(&fds);
770
771 i = 0; icount = 0;
772 buffer = SH_ALLOC(BUF_ENT+2);
773
774 if (0 != (caperr = sl_get_cap_sub()))
775 {
776 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
777 sh_error_message (caperr, errbuf, sizeof(errbuf)),
778 _("sl_get_cap_sub"));
779 }
780
781 while (source_template[i].command != NULL) {
782 ++i;
783 }
784 source = SH_ALLOC(i * sizeof(sourcetable_t));
785 for (j = 0; j < i;++j)
786 memcpy(&source[j], &source_template[j], sizeof(sourcetable_t));
787 i = 0;
788
789 while (source_template[i].command != NULL) {
790
791 j = 0;
792 while (com_path[j] != NULL)
793 {
794 sl_strlcpy(combuf, _(com_path[j]), 80);
795 sl_strlcat(combuf, _(source[i].command), 80);
796
797 /* flawfinder: ignore */
798 if ( access (combuf, X_OK) == 0)
799 {
800 sl_strlcpy(combuf, _(com_path[j]), 80);
801 sl_strlcat(combuf, _(source[i].arg), 80);
802 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENSTART,
803 combuf);
804 break;
805 }
806 ++j;
807 }
808
809 /* Not found, try next command.
810 */
811 if (com_path[j] == NULL)
812 {
813 ++i;
814 continue;
815 }
816
817 /* Source exists
818 */
819 source[i].pipe = sh_popen ( &source[i], combuf );
820 if (NULL != source[i].pipe)
821 {
822 source[i].pipeFD = fileno ( source[i].pipe );
823 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENEXEC,
824 combuf, (long) source[i].pipeFD);
825
826 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
827 retry_fcntl( FIL__, __LINE__, source[i].pipeFD, F_SETFL, O_NONBLOCK);
828 FD_SET( source[i].pipeFD, &fds );
829 source[i].isset = 1;
830 ++icount;
831 }
832 else
833 {
834 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENFAIL,
835 combuf);
836 }
837
838 ++i;
839 }
840
841 imax = i;
842 tv.tv_sec = 1;
843 tv.tv_usec = 0;
844 bufcount = 0;
845
846 while ( (icount > 0) && (bufcount < BUF_ENT) ) {
847
848 if ( (selcount = select (maxFD+1, &fds, NULL, NULL, &tv)) == -1)
849 break;
850
851 /* reset timeout for select()
852 */
853 tv.tv_sec = 1;
854 tv.tv_usec = 0;
855
856 /* timeout - let's not hang on forever
857 */
858 if (selcount == 0)
859 {
860 ++select_now;
861 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENTOUT,
862 (unsigned long) select_now);
863 if ( select_now > 9 )
864 break;
865 }
866
867 for (i = 0; i < imax; ++i) {
868
869 if ( FD_ISSET (source[i].pipeFD, &fds) ) {
870 count = fread (&buffer[bufcount],
871 1,
872 BUF_ENT-bufcount,
873 source[i].pipe );
874 if (count == 0)
875 {
876 if (0 != feof(source[i].pipe))
877 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS,
878 (long) source[i].pipeFD);
879 else
880 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS1,
881 (long) source[i].pipeFD);
882 source[i].isset = 0;
883 sh_pclose ( &source[i] );
884 --icount;
885 }
886 else
887 {
888 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENREAD,
889 (long) source[i].pipeFD, (long) count);
890 }
891 bufcount += count;
892
893 }
894 }
895
896 maxFD = 0;
897 FD_ZERO(&fds);
898
899 for (i = 0; i < imax; ++i)
900 {
901 if (source[i].isset == 1)
902 {
903 FD_SET( source[i].pipeFD, &fds );
904 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
905 }
906 }
907 }
908
909 for (i = 0; i < imax; ++i)
910 {
911 if (source[i].isset == 1)
912 {
913 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENCLOS1,
914 (long) source[i].pipeFD);
915 sh_pclose ( &source[i] );
916 }
917 }
918 buffer[bufcount] = '\0';
919
920 SH_FREE(source);
921
922 if (0 != (caperr = sl_drop_cap_sub()))
923 {
924 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
925 sh_error_message (caperr, errbuf, sizeof(errbuf)),
926 _("sl_drop_cap_sub"));
927 }
928
929 if (bufcount > 0)
930 {
931 keybuf = (char *) sh_tiger_hash_uint32 (buffer,
932 TIGER_DATA, sl_strlen(buffer),
933 kbuf, KEY_BYT/sizeof(UINT32));
934
935 /* add previous entropy into the new pool
936 */
937 memset(addbuf, '\0', sizeof(addbuf));
938 for (i = 0; i < KEY_BYT; ++i)
939 {
940 addbuf[i] = keybuf[i];
941 addbuf[i+KEY_BYT] = skey->poolv[i];
942 }
943 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
944 TIGER_DATA, sizeof(addbuf),
945 kbuf, KEY_BYT/sizeof(UINT32));
946 memset(addbuf, '\0', sizeof(addbuf));
947
948 /* store in system pool
949 */
950 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
951 for (i = 0; i < KEY_BYT; ++i)
952 skey->poolv[i] = keybuf[i];
953 skey->poolc = KEY_BYT;
954 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
955 memset (buffer, '\0', BUF_ENT+2);
956 memset (keybuf, '\0', KEY_BYT);
957 SH_FREE(buffer);
958 }
959 else
960 {
961 SH_FREE(buffer);
962 SL_RETURN((-1), _("sh_entropy"));
963 }
964
965 /* give out nbytes Bytes from the entropy pool
966 */
967 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
968 for (i = 0; i < nbytes; ++i)
969 {
970 nbuf[i] = skey->poolv[i];
971 --skey->poolc;
972 }
973 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
974
975 SL_RETURN(0, _("sh_entropy"));
976}
977
978/* HAVE_UNIX_RANDOM */
979#endif
980
981#ifdef SH_CUTEST
982#include "CuTest.h"
983
984void Test_entropy (CuTest *tc)
985{
986 char bufx[9 * sizeof(UINT32) + 1];
987 char bufy[9 * sizeof(UINT32) + 1];
988 int status;
989
990 memset(skey->poolv, '\0', KEY_BYT);
991
992 status = sh_entropy (24, bufx);
993 CuAssertTrue(tc, 0 == status);
994
995 memset(skey->poolv, '\0', KEY_BYT);
996
997 status = sh_entropy (24, bufy);
998 CuAssertTrue(tc, 0 == status);
999
1000 CuAssertTrue(tc, 0 != memcmp(bufx, bufy, 24));
1001}
1002#endif
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