source: branches/samhain-2_2-branch/src/sh_entropy.c@ 126

Last change on this file since 126 was 32, checked in by rainer, 18 years ago

Release version 2.2.0
File size: 21.9 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 static 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
150 #ifdef EGD_SOCKET_NAME
151 bname = EGD_SOCKET_NAME;
152 #endif
153 if ( !bname || !*bname )
154 bname = _("=entropy");
155
156 if ( *bname == '=' && bname[1] )
157 name = sh_util_strconcat ( DEFAULT_DATAROOT, "/", bname+1 , NULL );
158 else
159 name = sh_util_strconcat ( bname , NULL );
160
161 if ( strlen(name)+1 >= sizeof(addr.sun_path) )
162 {
163 sh_error_handle ((-1), FIL__, __LINE__, ENAMETOOLONG, MSG_E_SUBGEN,
164 _("EGD socketname is too long"),
165 _("sh_entropy") );
166 SH_FREE(name);
167 SL_RETURN( -1, _("sh_entropy") );
168 }
169
170 memset( &addr, 0, sizeof(addr) );
171 addr.sun_family = AF_UNIX;
172 sl_strlcpy( addr.sun_path, name, sizeof(addr.sun_path) );
173 addr_len = offsetof( struct sockaddr_un, sun_path )
174 + strlen( addr.sun_path );
175
176 fd = socket(AF_UNIX, SOCK_STREAM, 0);
177 if( fd == -1 )
178 {
179 myerror = errno;
180 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
181 _("cannot create unix domain socket"),
182 _("sh_entropy") );
183 SH_FREE(name);
184 SL_RETURN( -1, _("sh_entropy") );
185 }
186 if( connect( fd, (struct sockaddr*)&addr, addr_len) == -1 )
187 {
188 myerror = errno;
189 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
190 _("cannot connect to unix domain socket"),
191 _("sh_entropy") );
192 SH_FREE(name);
193 SL_RETURN( -1, _("sh_entropy") );
194 }
195 SH_FREE(name);
196 }
197 do_restart = 0;
198
199 nbytes = length < 255? length : 255;
200 /* first time we do it with a non blocking request */
201 buffer[0] = 1; /* non blocking */
202 buffer[1] = nbytes;
203 if( do_write( fd, buffer, 2 ) == -1 )
204 {
205 myerror = errno;
206 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
207 _("cannot write to EGD"),
208 _("sh_entropy") );
209 SL_RETURN( -1, _("sh_entropy") );
210 }
211 n = do_read( fd, buffer, 1 );
212 if( n == -1 ) {
213 myerror = errno;
214 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror, MSG_E_SUBGEN,
215 _("read error on EGD"),
216 _("sh_entropy") );
217 do_restart = 1;
218 goto restart;
219 }
220 n = buffer[0];
221 if( n ) {
222 n = do_read( fd, buffer, n );
223 if( n == -1 ) {
224 myerror = errno;
225 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror,MSG_E_SUBGEN,
226 _("read error on EGD"),
227 _("sh_entropy") );
228 do_restart = 1;
229 goto restart;
230 }
231 for (i = 0; i < n; ++i)
232 {
233 if (getbytes >= 0)
234 { *p = buffer[i]; ++p; --getbytes; }
235 }
236 length -= n;
237 }
238
239 while( length ) {
240 nbytes = length < 255? length : 255;
241
242 buffer[0] = 2; /* blocking */
243 buffer[1] = nbytes;
244 if( do_write( fd, buffer, 2 ) == -1 )
245 {
246 myerror = errno;
247 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
248 _("cannot write to EGD"),
249 _("sh_entropy") );
250 SL_RETURN( -1, _("sh_entropy") );
251 }
252 n = do_read( fd, buffer, nbytes );
253 if( n == -1 ) {
254 myerror = errno;
255 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror,MSG_E_SUBGEN,
256 _("read error on EGD"),
257 _("sh_entropy") );
258 do_restart = 1;
259 goto restart;
260 }
261 for (i = 0; i < n; ++i)
262 {
263 if (getbytes >= 0)
264 { *p = buffer[i]; ++p; --getbytes; }
265 }
266 length -= n;
267 }
268 memset(buffer, 0, sizeof(buffer) );
269
270 SL_RETURN( 0, _("sh_entropy") ); /* success */
271}
272
273/* HAVE_EGD_RANDOM */
274#endif
275
276#if defined (HAVE_URANDOM)
277
278#include <setjmp.h>
279
280static jmp_buf entropy_timeout;
281
282static void sh_entropy_alarmhandle (int mysignal)
283{
284 (void) mysignal; /* avoid compiler warning */
285 longjmp (entropy_timeout, 1);
286}
287
288
289int read_mbytes(int timeout_val, char * path, char * nbuf, int nbytes)
290{
291 int count, m_count;
292 int fd2;
293
294 struct sigaction new_act;
295 sigset_t unblock;
296
297 struct sigaction old_act;
298 volatile unsigned int old_alarm = 0;
299
300 new_act.sa_handler = sh_entropy_alarmhandle;
301 sigemptyset( &new_act.sa_mask ); /* set an empty mask */
302 new_act.sa_flags = 0; /* init sa_flags */
303
304 sigemptyset(&unblock);
305 sigaddset (&unblock, SIGALRM);
306
307 SL_ENTER(_("read_mbytes"));
308
309 if ((fd2 = aud_open (FIL__, __LINE__, SL_NOPRIV, path, O_RDONLY, 0)) >= 0)
310 {
311 /* Test whether file is a character device, and is
312 * not world writeable.
313 */
314 if (0 == sh_unix_file_exists(fd2))
315 {
316
317 /* alarm was triggered
318 */
319 if (setjmp(entropy_timeout) != 0)
320 {
321 alarm(0);
322 sigaction (SIGALRM, &old_act, NULL);
323 alarm(old_alarm);
324 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
325 TPT((0,FIL__,__LINE__, _("msg=<read_mbytes: timeout>\n")));
326 close (fd2);
327 SL_RETURN(0, _("read_mbytes"));
328 }
329
330 /* timeout after 30 seconds
331 */
332 old_alarm = alarm(0);
333 sigaction (SIGALRM, &new_act, &old_act);
334 alarm(timeout_val);
335
336 m_count = 0;
337
338 while (m_count < nbytes)
339 {
340 errno = 0; /* paranoia */
341 count = read (fd2, &nbuf[m_count], nbytes-m_count);
342
343 switch (count)
344 {
345 case -1:
346#ifdef EWOULDBLOCK
347 if (errno == EINTR || errno == EAGAIN ||
348 errno == EWOULDBLOCK)
349#else
350 if (errno == EINTR || errno == EAGAIN)
351#endif
352 continue;
353
354 /* if errno == -1 && no continue: fallthrough to this */
355 case 0:
356 break;
357 default:
358 m_count += count;
359 }
360 }
361 close (fd2);
362
363 alarm(0);
364 sigaction (SIGALRM, &old_act, NULL);
365 alarm(old_alarm);
366 sigprocmask(SIG_UNBLOCK, &unblock, NULL);
367 }
368 else
369 m_count = 0;
370 }
371 else
372 m_count = 0;
373
374 TPT((0, FIL__, __LINE__, _("msg=<read_mbytes: OK>\n")));
375 SL_RETURN(m_count, _("read_mbytes"));
376}
377
378/* Read nbytes bytes from /dev/random, mix them with
379 * previous reads using a hash function, and give out
380 * nbytes bytes from the result.
381 */
382int sh_entropy(int nbytes, char * nbuf)
383{
384 int i, m_count = 0;
385 char * keybuf;
386 char addbuf[2 * KEY_BYT];
387
388 SL_ENTER(_("sh_entropy"));
389
390 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
391
392 if (nbytes > KEY_BYT)
393 nbytes = KEY_BYT;
394
395 memset(nbuf, '\0', nbytes);
396
397#ifdef NAME_OF_DEV_URANDOM
398 m_count = read_mbytes (30, NAME_OF_DEV_RANDOM, nbuf, nbytes);
399#else
400 m_count = read_mbytes (300, NAME_OF_DEV_RANDOM, nbuf, nbytes);
401#endif
402
403 if (m_count == 0)
404 {
405#ifdef NAME_OF_DEV_URANDOM
406 sh_error_handle (SH_ERR_NOTICE, FIL__, __LINE__, EIO, MSG_NODEV,
407 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
408#else
409 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
410 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
411#endif
412 }
413
414#ifdef NAME_OF_DEV_URANDOM
415 if (m_count < nbytes)
416 {
417 i = read_mbytes(30, NAME_OF_DEV_URANDOM, &nbuf[m_count], nbytes-m_count);
418 if (i == 0)
419 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
420 (long) sh.real.uid, NAME_OF_DEV_URANDOM);
421 else
422 m_count += i;
423 }
424#endif
425
426
427 if (m_count > 0)
428 {
429 /* -- Add previous entropy into the new pool. --
430 */
431 memset(addbuf, '\0', sizeof(addbuf));
432 for (i = 0; i < m_count; ++i)
433 addbuf[i] = nbuf[i];
434 for (i = 0; i < KEY_BYT; ++i)
435 addbuf[i+KEY_BYT] = skey->poolv[i];
436 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
437 TIGER_DATA, 2 * KEY_BYT);
438 memset(addbuf, '\0', sizeof(addbuf));
439
440 /* -- Give out nbytes bytes from the new pool. --
441 */
442 for (i = 0; i < KEY_BYT; ++i)
443 {
444 skey->poolv[i] = keybuf[i];
445 if (i < nbytes)
446 nbuf[i] = keybuf[i];
447 }
448 memset (keybuf, '\0', KEY_BYT);
449
450 SL_RETURN(0, _("sh_entropy"));
451 }
452 else
453 {
454 SL_RETURN((-1), _("sh_entropy"));
455 }
456}
457
458/* HAVE_URANDOM */
459#endif
460
461#ifdef HAVE_UNIX_RANDOM
462
463#ifndef FD_SET
464#define NFDBITS 32
465#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
466#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
467#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
468#endif /* !FD_SET */
469#ifndef FD_SETSIZE
470#define FD_SETSIZE 32
471#endif
472#ifndef FD_ZERO
473#define FD_ZERO(p) memset((char *)(p), '\0', sizeof(*(p)))
474#endif
475
476#include "sh_static.h"
477
478static
479char * com_path[] = {
480 N_("/usr/bin/xpg4/"),
481 N_("/usr/ucb/"),
482 N_("/bin/"),
483 N_("/sbin/"),
484 N_("/usr/bin/"),
485 N_("/usr/sbin/"),
486 N_("/usr/local/bin/"),
487 NULL
488};
489
490
491typedef struct {
492 char * command;
493 char * arg;
494 int pipeFD;
495 pid_t pid;
496 int isset;
497 FILE * pipe;
498} sourcetable_t;
499
500static
501sourcetable_t source[] = {
502 { N_("w"),
503 N_("w"),
504 0,
505 0,
506 0,
507 NULL },
508 { N_("netstat"),
509 N_("netstat -n"),
510 0,
511 0,
512 0,
513 NULL },
514 { N_("ps"),
515 N_("ps -ef"),
516 0,
517 0,
518 0,
519 NULL },
520 { N_("arp"),
521 N_("arp -a"),
522 0,
523 0,
524 0,
525 NULL },
526 { N_("free"),
527 N_("free"),
528 0,
529 0,
530 0,
531 NULL },
532 { N_("uptime"),
533 N_("uptime"),
534 0,
535 0,
536 0,
537 NULL },
538 { N_("procinfo"),
539 N_("procinfo -a"),
540 0,
541 0,
542 0,
543 NULL },
544 { N_("vmstat"),
545 N_("vmstat"),
546 0,
547 0,
548 0,
549 NULL },
550 { N_("w"), /* Play it again, Sam. */
551 N_("w"),
552 0,
553 0,
554 0,
555 NULL },
556 { NULL,
557 NULL,
558 0,
559 0,
560 0,
561 NULL }
562};
563
564
565static FILE * sh_popen (sourcetable_t *source, char * command)
566{
567 int i;
568 int pipedes[2];
569 FILE *outf = NULL;
570 struct passwd * tempres;
571 char * arg[4];
572 char * envp[2];
573 size_t len;
574 char arg0[80];
575 char arg1[80];
576
577 SL_ENTER(_("sh_popen"));
578
579 strncpy (arg0, _("/bin/sh"), sizeof(arg0));
580 arg[0] = arg0;
581 strncpy (arg1, _("-c"), sizeof(arg1));
582 arg[1] = arg1;
583 arg[2] = command;
584 arg[3] = NULL;
585
586 if (sh.timezone != NULL)
587 {
588 len = sl_strlen(sh.timezone) + 4;
589 envp[0] = malloc (len); /* free() ok */
590 if (envp[0] != NULL)
591 sl_snprintf (envp[0], len, "TZ=%s", sh.timezone);
592 else
593 envp[0] = NULL;
594 envp[1] = NULL;
595 }
596 else
597 {
598 envp[0] = NULL;
599 }
600
601
602 /* Create the pipe
603 */
604 if (aud_pipe(FIL__, __LINE__, pipedes) < 0) {
605 if (envp[0] != NULL) free(envp[0]);
606 SL_RETURN(NULL, _("sh_popen"));
607 }
608
609 source->pid = aud_fork(FIL__, __LINE__);
610
611 /* Failure
612 */
613 if (source->pid == (pid_t) - 1) {
614 close(pipedes[0]);
615 close(pipedes[1]);
616 if (envp[0] != NULL) free(envp[0]);
617 SL_RETURN(NULL, _("sh_popen"));
618 }
619
620 if (source->pid == (pid_t) 0)
621 {
622
623 /* child - make read side of the pipe stdout
624 */
625 if (retry_aud_dup2(FIL__, __LINE__,
626 pipedes[STDOUT_FILENO], STDOUT_FILENO) < 0)
627 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
628
629 /* close the pipe descriptors
630 */
631 close (pipedes[STDIN_FILENO]);
632 close (pipedes[STDOUT_FILENO]);
633
634 /* don't leak file descriptors
635 */
636 sh_unix_closeall (3, -1); /* in child process */
637
638 /* zero priv info
639 */
640 memset(skey, 0, sizeof(sh_key_t));
641
642 /* drop root privileges
643 */
644 i = 0;
645 if (0 == geteuid()) {
646 tempres = sh_getpwnam(DEFAULT_IDENT);
647 if (NULL != tempres) {
648 i = aud_setgid(FIL__, __LINE__, tempres->pw_gid);
649 if (i == 0)
650 i = sh_unix_initgroups(DEFAULT_IDENT ,tempres->pw_gid);
651 if (i == 0)
652 i = aud_setuid(FIL__, __LINE__, tempres->pw_uid);
653 /* make sure we cannot get root again
654 */
655 if ((tempres->pw_uid != 0) && (aud_setuid(FIL__, __LINE__, 0) >= 0))
656 i = -1;
657 } else {
658 i = -1;
659 }
660 }
661
662 /* some problem ...
663 */
664 if (i == -1) {
665 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
666 }
667
668 freopen (_("/dev/null"), "r+", stderr);
669
670 /* exec the program */
671 retry_aud_execve (FIL__, __LINE__, _("/bin/sh"), arg, envp);
672
673 /* failed
674 */
675 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
676 }
677
678 /* parent
679 */
680 if (envp[0] != NULL)
681 free(envp[0]);
682
683 close (pipedes[STDOUT_FILENO]);
684 retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
685
686 outf = fdopen (pipedes[STDIN_FILENO], "r");
687
688 if (outf == NULL)
689 {
690 aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
691 close (pipedes[STDOUT_FILENO]);
692 waitpid (source->pid, NULL, 0);
693 source->pid = 0;
694 SL_RETURN(NULL, _("sh_popen"));
695 }
696
697 SL_RETURN(outf, _("sh_popen"));
698}
699
700
701static int sh_pclose (sourcetable_t *source)
702{
703 int status = 0;
704 int retval;
705 char msg[128];
706
707 SL_ENTER(_("sh_pclose"));
708
709 retval = fclose(source->pipe);
710 if (retval)
711 {
712 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
713 MSG_E_SUBGEN,
714 sh_error_message(retval),
715 _("sh_pclose"));
716 SL_RETURN((-1), _("sh_pclose"));
717 }
718
719 retval = waitpid(source->pid, &status, 0);
720 if (retval != source->pid)
721 {
722 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
723 MSG_E_SUBGEN,
724 sh_error_message(retval),
725 _("sh_pclose"));
726
727 status = -1;
728 }
729 else if (WIFSIGNALED(status))
730 {
731 sl_snprintf(msg, sizeof(msg), _("Subprocess terminated by signal %d"),
732 WTERMSIG(status));
733 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
734 MSG_E_SUBGEN,
735 msg,
736 _("sh_pclose"));
737 status = -1;
738 }
739
740 source->pipe = NULL;
741 source->pid = 0;
742 SL_RETURN(status, _("sh_pclose"));
743}
744
745#define BUF_ENT 32766
746
747/* Poll the system for randomness, mix results with
748 * previous reads using a hash function, and give out
749 * nbytes bytes from the result.
750 */
751int sh_entropy(int nbytes, char * nbuf)
752{
753 int caperr;
754 char combuf[80];
755 char * buffer;
756 int i, j, icount;
757 int bufcount = 0;
758 int count;
759
760 char * keybuf;
761 char addbuf[2 * KEY_BYT];
762
763 struct timeval tv;
764 fd_set fds;
765 unsigned long select_now = 0;
766 int maxFD = 0;
767 int imax, selcount;
768
769 SL_ENTER(_("sh_entropy"));
770
771 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
772
773 if (nbytes > KEY_BYT)
774 nbytes = KEY_BYT;
775
776
777 /* --- If there is entropy in the pool, return it. ---
778 */
779 if (skey->poolc >= nbytes)
780 {
781 j = KEY_BYT - skey->poolc;
782 for (i = 0; i < nbytes; ++i)
783 {
784 nbuf[i] = skey->poolv[i+j];
785 --skey->poolc;
786 }
787 SL_RETURN(0, _("sh_entropy"));
788 }
789
790
791 FD_ZERO(&fds);
792
793 i = 0; icount = 0;
794 buffer = SH_ALLOC(BUF_ENT+2);
795
796 if (0 != (caperr = sl_get_cap_sub()))
797 {
798 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
799 sh_error_message (caperr),
800 _("sl_get_cap_sub"));
801 }
802
803 while (source[i].command != NULL) {
804
805 j = 0;
806 while (com_path[j] != NULL)
807 {
808 sl_strlcpy(combuf, _(com_path[j]), 80);
809 sl_strlcat(combuf, _(source[i].command), 80);
810
811 /* flawfinder: ignore */
812 if ( access (combuf, X_OK) == 0)
813 {
814 sl_strlcpy(combuf, _(com_path[j]), 80);
815 sl_strlcat(combuf, _(source[i].arg), 80);
816 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENSTART,
817 combuf);
818 break;
819 }
820 ++j;
821 }
822
823 /* Not found, try next command.
824 */
825 if (com_path[j] == NULL)
826 {
827 ++i;
828 continue;
829 }
830
831 /* Source exists
832 */
833 source[i].pipe = sh_popen ( &source[i], combuf );
834 if (NULL != source[i].pipe)
835 {
836 source[i].pipeFD = fileno ( source[i].pipe );
837 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENEXEC,
838 combuf, (long) source[i].pipeFD);
839
840 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
841 retry_fcntl( FIL__, __LINE__, source[i].pipeFD, F_SETFL, O_NONBLOCK);
842 FD_SET( source[i].pipeFD, &fds );
843 source[i].isset = 1;
844 ++icount;
845 }
846 else
847 {
848 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENFAIL,
849 combuf);
850 }
851
852 ++i;
853 }
854
855 imax = i;
856 tv.tv_sec = 1;
857 tv.tv_usec = 0;
858 bufcount = 0;
859
860 while ( (icount > 0) && (bufcount < BUF_ENT) ) {
861
862 if ( (selcount = select (maxFD+1, &fds, NULL, NULL, &tv)) == -1)
863 break;
864
865 /* reset timeout for select()
866 */
867 tv.tv_sec = 1;
868 tv.tv_usec = 0;
869
870 /* timeout - let's not hang on forever
871 */
872 if (selcount == 0)
873 {
874 ++select_now;
875 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENTOUT,
876 (unsigned long) select_now);
877 if ( select_now > 9 )
878 break;
879 }
880
881 for (i = 0; i < imax; ++i) {
882
883 if ( FD_ISSET (source[i].pipeFD, &fds) ) {
884 count = fread (&buffer[bufcount],
885 1,
886 BUF_ENT-bufcount,
887 source[i].pipe );
888 if (count == 0)
889 {
890 if (0 != feof(source[i].pipe))
891 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS,
892 (long) source[i].pipeFD);
893 else
894 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS1,
895 (long) source[i].pipeFD);
896 source[i].isset = 0;
897 sh_pclose ( &source[i] );
898 --icount;
899 }
900 else
901 {
902 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENREAD,
903 (long) source[i].pipeFD, (long) count);
904 }
905 bufcount += count;
906
907 }
908 }
909
910 maxFD = 0;
911 FD_ZERO(&fds);
912
913 for (i = 0; i < imax; ++i)
914 {
915 if (source[i].isset == 1)
916 {
917 FD_SET( source[i].pipeFD, &fds );
918 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
919 }
920 }
921 }
922
923 for (i = 0; i < imax; ++i)
924 {
925 if (source[i].isset == 1)
926 {
927 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENCLOS1,
928 (long) source[i].pipeFD);
929 sh_pclose ( &source[i] );
930 }
931 }
932 buffer[bufcount] = '\0';
933
934 if (0 != (caperr = sl_drop_cap_sub()))
935 {
936 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
937 sh_error_message (caperr),
938 _("sl_drop_cap_sub"));
939 }
940
941 if (bufcount > 0)
942 {
943 keybuf = (char *) sh_tiger_hash_uint32 (buffer,
944 TIGER_DATA, sl_strlen(buffer));
945
946 /* add previous entropy into the new pool
947 */
948 memset(addbuf, '\0', sizeof(addbuf));
949 for (i = 0; i < KEY_BYT; ++i)
950 {
951 addbuf[i] = keybuf[i];
952 addbuf[i+KEY_BYT] = skey->poolv[i];
953 }
954 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
955 TIGER_DATA, sizeof(addbuf));
956 memset(addbuf, '\0', sizeof(addbuf));
957
958 /* store in system pool
959 */
960 for (i = 0; i < KEY_BYT; ++i)
961 skey->poolv[i] = keybuf[i];
962 skey->poolc = KEY_BYT;
963 memset (buffer, '\0', BUF_ENT+2);
964 memset (keybuf, '\0', KEY_BYT);
965 SH_FREE(buffer);
966 }
967 else
968 {
969 SH_FREE(buffer);
970 SL_RETURN((-1), _("sh_entropy"));
971 }
972
973 /* give out nbytes Bytes from the entropy pool
974 */
975 for (i = 0; i < nbytes; ++i)
976 {
977 nbuf[i] = skey->poolv[i];
978 --skey->poolc;
979 }
980
981 SL_RETURN(0, _("sh_entropy"));
982}
983
984/* HAVE_UNIX_RANDOM */
985#endif
986
987
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992
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