source: trunk/src/sh_entropy.c@ 132

Last change on this file since 132 was 132, checked in by rainer, 18 years ago

Make utility functions thread-safe.
File size: 20.7 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
278int read_mbytes(int timeout_val, char * path, char * nbuf, int nbytes)
279{
280 int m_count;
281 int fd2;
282
283 SL_ENTER(_("read_mbytes"));
284
285 if ((fd2 = aud_open (FIL__, __LINE__, SL_NOPRIV, path, O_RDONLY, 0)) >= 0)
286 {
287 /* Test whether file is a character device, and is
288 * readable.
289 */
290 if (0 == sh_unix_device_readable(fd2))
291 {
292 m_count = sl_read_timeout_fd(fd2, &nbuf, nbytes,
293 timeout_val, SL_FALSE);
294 if (m_count < 0)
295 m_count = 0;
296 }
297 else
298 m_count = 0;
299 }
300 else
301 m_count = 0;
302
303 close(fd2);
304
305 TPT((0, FIL__, __LINE__, _("msg=<read_mbytes: OK>\n")));
306 SL_RETURN(m_count, _("read_mbytes"));
307}
308
309/* Read nbytes bytes from /dev/random, mix them with
310 * previous reads using a hash function, and give out
311 * nbytes bytes from the result.
312 */
313int sh_entropy(int nbytes, char * nbuf)
314{
315 int i, m_count = 0;
316 char * keybuf;
317 char addbuf[2 * KEY_BYT];
318
319 SL_ENTER(_("sh_entropy"));
320
321 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
322
323 if (nbytes > KEY_BYT)
324 nbytes = KEY_BYT;
325
326 memset(nbuf, '\0', nbytes);
327
328#ifdef NAME_OF_DEV_URANDOM
329 m_count = read_mbytes (30, NAME_OF_DEV_RANDOM, nbuf, nbytes);
330#else
331 m_count = read_mbytes (300, NAME_OF_DEV_RANDOM, nbuf, nbytes);
332#endif
333
334 if (m_count == 0)
335 {
336#ifdef NAME_OF_DEV_URANDOM
337 sh_error_handle (SH_ERR_NOTICE, FIL__, __LINE__, EIO, MSG_NODEV,
338 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
339#else
340 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
341 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
342#endif
343 }
344
345#ifdef NAME_OF_DEV_URANDOM
346 if (m_count < nbytes)
347 {
348 i = read_mbytes(30, NAME_OF_DEV_URANDOM, &nbuf[m_count], nbytes-m_count);
349 if (i == 0)
350 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
351 (long) sh.real.uid, NAME_OF_DEV_URANDOM);
352 else
353 m_count += i;
354 }
355#endif
356
357
358 if (m_count > 0)
359 {
360 /* -- Add previous entropy into the new pool. --
361 */
362 memset(addbuf, '\0', sizeof(addbuf));
363 for (i = 0; i < m_count; ++i)
364 addbuf[i] = nbuf[i];
365 for (i = 0; i < KEY_BYT; ++i)
366 addbuf[i+KEY_BYT] = skey->poolv[i];
367 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
368 TIGER_DATA, 2 * KEY_BYT);
369 memset(addbuf, '\0', sizeof(addbuf));
370
371 /* -- Give out nbytes bytes from the new pool. --
372 */
373 for (i = 0; i < KEY_BYT; ++i)
374 {
375 skey->poolv[i] = keybuf[i];
376 if (i < nbytes)
377 nbuf[i] = keybuf[i];
378 }
379 memset (keybuf, '\0', KEY_BYT);
380
381 SL_RETURN(0, _("sh_entropy"));
382 }
383 else
384 {
385 SL_RETURN((-1), _("sh_entropy"));
386 }
387}
388
389/* HAVE_URANDOM */
390#endif
391
392#ifdef HAVE_UNIX_RANDOM
393
394#ifndef FD_SET
395#define NFDBITS 32
396#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
397#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
398#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
399#endif /* !FD_SET */
400#ifndef FD_SETSIZE
401#define FD_SETSIZE 32
402#endif
403#ifndef FD_ZERO
404#define FD_ZERO(p) memset((char *)(p), '\0', sizeof(*(p)))
405#endif
406
407#include "sh_static.h"
408
409static
410char * com_path[] = {
411 N_("/usr/bin/xpg4/"),
412 N_("/usr/ucb/"),
413 N_("/bin/"),
414 N_("/sbin/"),
415 N_("/usr/bin/"),
416 N_("/usr/sbin/"),
417 N_("/usr/local/bin/"),
418 NULL
419};
420
421
422typedef struct {
423 char * command;
424 char * arg;
425 int pipeFD;
426 pid_t pid;
427 int isset;
428 FILE * pipe;
429} sourcetable_t;
430
431static
432sourcetable_t source[] = {
433 { N_("w"),
434 N_("w"),
435 0,
436 0,
437 0,
438 NULL },
439 { N_("netstat"),
440 N_("netstat -n"),
441 0,
442 0,
443 0,
444 NULL },
445 { N_("ps"),
446 N_("ps -ef"),
447 0,
448 0,
449 0,
450 NULL },
451 { N_("arp"),
452 N_("arp -a"),
453 0,
454 0,
455 0,
456 NULL },
457 { N_("free"),
458 N_("free"),
459 0,
460 0,
461 0,
462 NULL },
463 { N_("uptime"),
464 N_("uptime"),
465 0,
466 0,
467 0,
468 NULL },
469 { N_("procinfo"),
470 N_("procinfo -a"),
471 0,
472 0,
473 0,
474 NULL },
475 { N_("vmstat"),
476 N_("vmstat"),
477 0,
478 0,
479 0,
480 NULL },
481 { N_("w"), /* Play it again, Sam. */
482 N_("w"),
483 0,
484 0,
485 0,
486 NULL },
487 { NULL,
488 NULL,
489 0,
490 0,
491 0,
492 NULL }
493};
494
495
496static FILE * sh_popen (sourcetable_t *source, char * command)
497{
498 int i;
499 int pipedes[2];
500 FILE *outf = NULL;
501 char * arg[4];
502 char * envp[2];
503 size_t len;
504 char arg0[80];
505 char arg1[80];
506
507 SL_ENTER(_("sh_popen"));
508
509 strncpy (arg0, _("/bin/sh"), sizeof(arg0));
510 arg[0] = arg0;
511 strncpy (arg1, _("-c"), sizeof(arg1));
512 arg[1] = arg1;
513 arg[2] = command;
514 arg[3] = NULL;
515
516 if (sh.timezone != NULL)
517 {
518 len = sl_strlen(sh.timezone) + 4;
519 envp[0] = malloc (len); /* free() ok */
520 if (envp[0] != NULL)
521 sl_snprintf (envp[0], len, "TZ=%s", sh.timezone);
522 else
523 envp[0] = NULL;
524 envp[1] = NULL;
525 }
526 else
527 {
528 envp[0] = NULL;
529 }
530
531
532 /* Create the pipe
533 */
534 if (aud_pipe(FIL__, __LINE__, pipedes) < 0) {
535 if (envp[0] != NULL) free(envp[0]);
536 SL_RETURN(NULL, _("sh_popen"));
537 }
538
539 fflush (NULL);
540
541 source->pid = aud_fork(FIL__, __LINE__);
542
543 /* Failure
544 */
545 if (source->pid == (pid_t) - 1) {
546 close(pipedes[0]);
547 close(pipedes[1]);
548 if (envp[0] != NULL) free(envp[0]);
549 SL_RETURN(NULL, _("sh_popen"));
550 }
551
552 if (source->pid == (pid_t) 0)
553 {
554
555 /* child - make read side of the pipe stdout
556 */
557 if (retry_aud_dup2(FIL__, __LINE__,
558 pipedes[STDOUT_FILENO], STDOUT_FILENO) < 0)
559 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
560
561 /* close the pipe descriptors
562 */
563 close (pipedes[STDIN_FILENO]);
564 close (pipedes[STDOUT_FILENO]);
565
566 /* don't leak file descriptors
567 */
568 sh_unix_closeall (3, -1); /* in child process */
569
570 /* zero priv info
571 */
572 memset(skey, 0, sizeof(sh_key_t));
573
574 /* drop root privileges
575 */
576 i = 0;
577 if (0 == geteuid())
578 {
579#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
580 struct passwd pwd;
581 char buffer[SH_PWBUF_SIZE];
582 struct passwd * tempres;
583 sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, sizeof(buffer), &tempres);
584#else
585 struct passwd * tempres = sh_getpwnam(DEFAULT_IDENT);
586#endif
587
588 if (NULL != tempres) {
589 i = aud_setgid(FIL__, __LINE__, tempres->pw_gid);
590 if (i == 0)
591 i = sh_unix_initgroups(DEFAULT_IDENT ,tempres->pw_gid);
592 if (i == 0)
593 i = aud_setuid(FIL__, __LINE__, tempres->pw_uid);
594 /* make sure we cannot get root again
595 */
596 if ((tempres->pw_uid != 0) && (aud_setuid(FIL__, __LINE__, 0) >= 0))
597 i = -1;
598 } else {
599 i = -1;
600 }
601 }
602
603 /* some problem ...
604 */
605 if (i == -1) {
606 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
607 }
608
609 freopen (_("/dev/null"), "r+", stderr);
610
611 /* exec the program */
612 retry_aud_execve (FIL__, __LINE__, _("/bin/sh"), arg, envp);
613
614 /* failed
615 */
616 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
617 }
618
619 /* parent
620 */
621 if (envp[0] != NULL)
622 free(envp[0]);
623
624 close (pipedes[STDOUT_FILENO]);
625 retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
626
627 outf = fdopen (pipedes[STDIN_FILENO], "r");
628
629 if (outf == NULL)
630 {
631 aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
632 close (pipedes[STDOUT_FILENO]);
633 waitpid (source->pid, NULL, 0);
634 source->pid = 0;
635 SL_RETURN(NULL, _("sh_popen"));
636 }
637
638 SL_RETURN(outf, _("sh_popen"));
639}
640
641
642static int sh_pclose (sourcetable_t *source)
643{
644 int status = 0;
645 int retval;
646 char msg[128];
647 char errbuf[SH_ERRBUF_SIZE];
648
649 SL_ENTER(_("sh_pclose"));
650
651 retval = fclose(source->pipe);
652 if (retval)
653 {
654 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
655 MSG_E_SUBGEN,
656 sh_error_message(retval, errbuf, sizeof(errbuf)),
657 _("sh_pclose"));
658 SL_RETURN((-1), _("sh_pclose"));
659 }
660
661 retval = waitpid(source->pid, &status, 0);
662 if (retval != source->pid)
663 {
664 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
665 MSG_E_SUBGEN,
666 sh_error_message(retval, errbuf, sizeof(errbuf)),
667 _("sh_pclose"));
668
669 status = -1;
670 }
671 else if (WIFSIGNALED(status))
672 {
673 sl_snprintf(msg, sizeof(msg), _("Subprocess terminated by signal %d"),
674 WTERMSIG(status));
675 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
676 MSG_E_SUBGEN,
677 msg,
678 _("sh_pclose"));
679 status = -1;
680 }
681
682 source->pipe = NULL;
683 source->pid = 0;
684 SL_RETURN(status, _("sh_pclose"));
685}
686
687#define BUF_ENT 32766
688
689/* Poll the system for randomness, mix results with
690 * previous reads using a hash function, and give out
691 * nbytes bytes from the result.
692 */
693int sh_entropy(int nbytes, char * nbuf)
694{
695 int caperr;
696 char combuf[80];
697 char * buffer;
698 int i, j, icount;
699 int bufcount = 0;
700 int count;
701
702 char * keybuf;
703 char addbuf[2 * KEY_BYT];
704
705 struct timeval tv;
706 fd_set fds;
707 unsigned long select_now = 0;
708 int maxFD = 0;
709 int imax, selcount;
710 char errbuf[SH_ERRBUF_SIZE];
711
712 SL_ENTER(_("sh_entropy"));
713
714 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
715
716 if (nbytes > KEY_BYT)
717 nbytes = KEY_BYT;
718
719
720 /* --- If there is entropy in the pool, return it. ---
721 */
722 if (skey->poolc >= nbytes)
723 {
724 j = KEY_BYT - skey->poolc;
725 for (i = 0; i < nbytes; ++i)
726 {
727 nbuf[i] = skey->poolv[i+j];
728 --skey->poolc;
729 }
730 SL_RETURN(0, _("sh_entropy"));
731 }
732
733
734 FD_ZERO(&fds);
735
736 i = 0; icount = 0;
737 buffer = SH_ALLOC(BUF_ENT+2);
738
739 if (0 != (caperr = sl_get_cap_sub()))
740 {
741 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
742 sh_error_message (caperr, errbuf, sizeof(errbuf)),
743 _("sl_get_cap_sub"));
744 }
745
746 while (source[i].command != NULL) {
747
748 j = 0;
749 while (com_path[j] != NULL)
750 {
751 sl_strlcpy(combuf, _(com_path[j]), 80);
752 sl_strlcat(combuf, _(source[i].command), 80);
753
754 /* flawfinder: ignore */
755 if ( access (combuf, X_OK) == 0)
756 {
757 sl_strlcpy(combuf, _(com_path[j]), 80);
758 sl_strlcat(combuf, _(source[i].arg), 80);
759 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENSTART,
760 combuf);
761 break;
762 }
763 ++j;
764 }
765
766 /* Not found, try next command.
767 */
768 if (com_path[j] == NULL)
769 {
770 ++i;
771 continue;
772 }
773
774 /* Source exists
775 */
776 source[i].pipe = sh_popen ( &source[i], combuf );
777 if (NULL != source[i].pipe)
778 {
779 source[i].pipeFD = fileno ( source[i].pipe );
780 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENEXEC,
781 combuf, (long) source[i].pipeFD);
782
783 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
784 retry_fcntl( FIL__, __LINE__, source[i].pipeFD, F_SETFL, O_NONBLOCK);
785 FD_SET( source[i].pipeFD, &fds );
786 source[i].isset = 1;
787 ++icount;
788 }
789 else
790 {
791 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENFAIL,
792 combuf);
793 }
794
795 ++i;
796 }
797
798 imax = i;
799 tv.tv_sec = 1;
800 tv.tv_usec = 0;
801 bufcount = 0;
802
803 while ( (icount > 0) && (bufcount < BUF_ENT) ) {
804
805 if ( (selcount = select (maxFD+1, &fds, NULL, NULL, &tv)) == -1)
806 break;
807
808 /* reset timeout for select()
809 */
810 tv.tv_sec = 1;
811 tv.tv_usec = 0;
812
813 /* timeout - let's not hang on forever
814 */
815 if (selcount == 0)
816 {
817 ++select_now;
818 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENTOUT,
819 (unsigned long) select_now);
820 if ( select_now > 9 )
821 break;
822 }
823
824 for (i = 0; i < imax; ++i) {
825
826 if ( FD_ISSET (source[i].pipeFD, &fds) ) {
827 count = fread (&buffer[bufcount],
828 1,
829 BUF_ENT-bufcount,
830 source[i].pipe );
831 if (count == 0)
832 {
833 if (0 != feof(source[i].pipe))
834 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS,
835 (long) source[i].pipeFD);
836 else
837 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS1,
838 (long) source[i].pipeFD);
839 source[i].isset = 0;
840 sh_pclose ( &source[i] );
841 --icount;
842 }
843 else
844 {
845 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENREAD,
846 (long) source[i].pipeFD, (long) count);
847 }
848 bufcount += count;
849
850 }
851 }
852
853 maxFD = 0;
854 FD_ZERO(&fds);
855
856 for (i = 0; i < imax; ++i)
857 {
858 if (source[i].isset == 1)
859 {
860 FD_SET( source[i].pipeFD, &fds );
861 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
862 }
863 }
864 }
865
866 for (i = 0; i < imax; ++i)
867 {
868 if (source[i].isset == 1)
869 {
870 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENCLOS1,
871 (long) source[i].pipeFD);
872 sh_pclose ( &source[i] );
873 }
874 }
875 buffer[bufcount] = '\0';
876
877 if (0 != (caperr = sl_drop_cap_sub()))
878 {
879 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
880 sh_error_message (caperr, errbuf, sizeof(errbuf)),
881 _("sl_drop_cap_sub"));
882 }
883
884 if (bufcount > 0)
885 {
886 keybuf = (char *) sh_tiger_hash_uint32 (buffer,
887 TIGER_DATA, sl_strlen(buffer));
888
889 /* add previous entropy into the new pool
890 */
891 memset(addbuf, '\0', sizeof(addbuf));
892 for (i = 0; i < KEY_BYT; ++i)
893 {
894 addbuf[i] = keybuf[i];
895 addbuf[i+KEY_BYT] = skey->poolv[i];
896 }
897 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
898 TIGER_DATA, sizeof(addbuf));
899 memset(addbuf, '\0', sizeof(addbuf));
900
901 /* store in system pool
902 */
903 for (i = 0; i < KEY_BYT; ++i)
904 skey->poolv[i] = keybuf[i];
905 skey->poolc = KEY_BYT;
906 memset (buffer, '\0', BUF_ENT+2);
907 memset (keybuf, '\0', KEY_BYT);
908 SH_FREE(buffer);
909 }
910 else
911 {
912 SH_FREE(buffer);
913 SL_RETURN((-1), _("sh_entropy"));
914 }
915
916 /* give out nbytes Bytes from the entropy pool
917 */
918 for (i = 0; i < nbytes; ++i)
919 {
920 nbuf[i] = skey->poolv[i];
921 --skey->poolc;
922 }
923
924 SL_RETURN(0, _("sh_entropy"));
925}
926
927/* HAVE_UNIX_RANDOM */
928#endif
929
930
931
932
933
934
935
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