source: trunk/src/sh_entropy.c@ 136

Last change on this file since 136 was 135, checked in by rainer, 17 years ago

Reentrant sh_entropy() function.
File size: 21.6 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
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 close(fd);
194 SL_RETURN( -1, _("sh_entropy") );
195 }
196 SH_FREE(name);
197 }
198 do_restart = 0;
199
200 nbytes = length < 255? length : 255;
201 /* first time we do it with a non blocking request */
202 buffer[0] = 1; /* non blocking */
203 buffer[1] = nbytes;
204 if( do_write( fd, buffer, 2 ) == -1 )
205 {
206 myerror = errno;
207 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
208 _("cannot write to EGD"),
209 _("sh_entropy") );
210 close(fd);
211 SL_RETURN( -1, _("sh_entropy") );
212 }
213 n = do_read( fd, buffer, 1 );
214 if( n == -1 ) {
215 myerror = errno;
216 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror, MSG_E_SUBGEN,
217 _("read error on EGD"),
218 _("sh_entropy") );
219 do_restart = 1;
220 goto restart;
221 }
222 n = buffer[0];
223 if( n ) {
224 n = do_read( fd, buffer, n );
225 if( n == -1 ) {
226 myerror = errno;
227 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror,MSG_E_SUBGEN,
228 _("read error on EGD"),
229 _("sh_entropy") );
230 do_restart = 1;
231 goto restart;
232 }
233 for (i = 0; i < n; ++i)
234 {
235 if (getbytes >= 0)
236 { *p = buffer[i]; ++p; --getbytes; }
237 }
238 length -= n;
239 }
240
241 while( length ) {
242 nbytes = length < 255? length : 255;
243
244 buffer[0] = 2; /* blocking */
245 buffer[1] = nbytes;
246 if( do_write( fd, buffer, 2 ) == -1 )
247 {
248 myerror = errno;
249 sh_error_handle ((-1), FIL__, __LINE__, myerror, MSG_E_SUBGEN,
250 _("cannot write to EGD"),
251 _("sh_entropy") );
252 close(fd);
253 SL_RETURN( -1, _("sh_entropy") );
254 }
255 n = do_read( fd, buffer, nbytes );
256 if( n == -1 ) {
257 myerror = errno;
258 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, myerror,MSG_E_SUBGEN,
259 _("read error on EGD"),
260 _("sh_entropy") );
261 do_restart = 1;
262 goto restart;
263 }
264 for (i = 0; i < n; ++i)
265 {
266 if (getbytes >= 0)
267 { *p = buffer[i]; ++p; --getbytes; }
268 }
269 length -= n;
270 }
271 memset(buffer, 0, sizeof(buffer) );
272 close(fd);
273 SL_RETURN( 0, _("sh_entropy") ); /* success */
274}
275
276/* HAVE_EGD_RANDOM */
277#endif
278
279#if defined (HAVE_URANDOM)
280
281#include "sh_pthread.h"
282
283int read_mbytes(int timeout_val, char * path, char * nbuf, int nbytes)
284{
285 int m_count;
286 int fd2;
287
288 SL_ENTER(_("read_mbytes"));
289
290 if ((fd2 = aud_open (FIL__, __LINE__, SL_NOPRIV, path, O_RDONLY, 0)) >= 0)
291 {
292 /* Test whether file is a character device, and is
293 * readable.
294 */
295 if (0 == sh_unix_device_readable(fd2))
296 {
297 m_count = sl_read_timeout_fd(fd2, &nbuf, nbytes,
298 timeout_val, SL_FALSE);
299 if (m_count < 0)
300 m_count = 0;
301 }
302 else
303 m_count = 0;
304 }
305 else
306 m_count = 0;
307
308 close(fd2);
309
310 TPT((0, FIL__, __LINE__, _("msg=<read_mbytes: OK>\n")));
311 SL_RETURN(m_count, _("read_mbytes"));
312}
313
314/* Read nbytes bytes from /dev/random, mix them with
315 * previous reads using a hash function, and give out
316 * nbytes bytes from the result.
317 */
318int sh_entropy(int nbytes, char * nbuf)
319{
320 int i, m_count = 0;
321 char * keybuf;
322 UINT32 kbuf[KEY_BYT/sizeof(UINT32)];
323 char addbuf[2 * KEY_BYT];
324
325 SL_ENTER(_("sh_entropy"));
326
327 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
328
329 if (nbytes > KEY_BYT)
330 nbytes = KEY_BYT;
331
332 memset(nbuf, '\0', nbytes);
333
334#ifdef NAME_OF_DEV_URANDOM
335 m_count = read_mbytes (30, NAME_OF_DEV_RANDOM, nbuf, nbytes);
336#else
337 m_count = read_mbytes (300, NAME_OF_DEV_RANDOM, nbuf, nbytes);
338#endif
339
340 if (m_count == 0)
341 {
342#ifdef NAME_OF_DEV_URANDOM
343 sh_error_handle (SH_ERR_NOTICE, FIL__, __LINE__, EIO, MSG_NODEV,
344 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
345#else
346 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
347 (long) sh.real.uid, NAME_OF_DEV_RANDOM);
348#endif
349 }
350
351#ifdef NAME_OF_DEV_URANDOM
352 if (m_count < nbytes)
353 {
354 i = read_mbytes(30, NAME_OF_DEV_URANDOM, &nbuf[m_count], nbytes-m_count);
355 if (i == 0)
356 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_NODEV,
357 (long) sh.real.uid, NAME_OF_DEV_URANDOM);
358 else
359 m_count += i;
360 }
361#endif
362
363
364 if (m_count > 0)
365 {
366 /* -- Add previous entropy into the new pool. --
367 */
368 memset(addbuf, '\0', sizeof(addbuf));
369 for (i = 0; i < m_count; ++i)
370 addbuf[i] = nbuf[i];
371 for (i = 0; i < KEY_BYT; ++i)
372 addbuf[i+KEY_BYT] = skey->poolv[i];
373 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
374 TIGER_DATA, 2 * KEY_BYT,
375 kbuf, KEY_BYT/sizeof(UINT32));
376 memset(addbuf, '\0', sizeof(addbuf));
377
378 /* -- Give out nbytes bytes from the new pool. --
379 */
380 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
381 for (i = 0; i < KEY_BYT; ++i)
382 {
383 skey->poolv[i] = keybuf[i];
384 if (i < nbytes)
385 nbuf[i] = keybuf[i];
386 }
387 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
388 memset (keybuf, '\0', KEY_BYT);
389
390 SL_RETURN(0, _("sh_entropy"));
391 }
392 else
393 {
394 SL_RETURN((-1), _("sh_entropy"));
395 }
396}
397
398/* HAVE_URANDOM */
399#endif
400
401#ifdef HAVE_UNIX_RANDOM
402
403#ifndef FD_SET
404#define NFDBITS 32
405#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
406#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
407#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
408#endif /* !FD_SET */
409#ifndef FD_SETSIZE
410#define FD_SETSIZE 32
411#endif
412#ifndef FD_ZERO
413#define FD_ZERO(p) memset((char *)(p), '\0', sizeof(*(p)))
414#endif
415
416#include "sh_static.h"
417#include "sh_pthread.h"
418
419static
420char * com_path[] = {
421 N_("/usr/bin/xpg4/"),
422 N_("/usr/ucb/"),
423 N_("/bin/"),
424 N_("/sbin/"),
425 N_("/usr/bin/"),
426 N_("/usr/sbin/"),
427 N_("/usr/local/bin/"),
428 NULL
429};
430
431
432typedef struct {
433 char * command;
434 char * arg;
435 int pipeFD;
436 pid_t pid;
437 int isset;
438 FILE * pipe;
439} sourcetable_t;
440
441static
442sourcetable_t source_template[] = {
443 { N_("w"),
444 N_("w"),
445 0,
446 0,
447 0,
448 NULL },
449 { N_("netstat"),
450 N_("netstat -n"),
451 0,
452 0,
453 0,
454 NULL },
455 { N_("ps"),
456 N_("ps -ef"),
457 0,
458 0,
459 0,
460 NULL },
461 { N_("arp"),
462 N_("arp -a"),
463 0,
464 0,
465 0,
466 NULL },
467 { N_("free"),
468 N_("free"),
469 0,
470 0,
471 0,
472 NULL },
473 { N_("uptime"),
474 N_("uptime"),
475 0,
476 0,
477 0,
478 NULL },
479 { N_("procinfo"),
480 N_("procinfo -a"),
481 0,
482 0,
483 0,
484 NULL },
485 { N_("vmstat"),
486 N_("vmstat"),
487 0,
488 0,
489 0,
490 NULL },
491 { N_("w"), /* Play it again, Sam. */
492 N_("w"),
493 0,
494 0,
495 0,
496 NULL },
497 { NULL,
498 NULL,
499 0,
500 0,
501 0,
502 NULL }
503};
504
505
506static FILE * sh_popen (sourcetable_t *source, char * command)
507{
508 int i;
509 int pipedes[2];
510 FILE *outf = NULL;
511 char * arg[4];
512 char * envp[2];
513 size_t len;
514 char arg0[80];
515 char arg1[80];
516
517 SL_ENTER(_("sh_popen"));
518
519 strncpy (arg0, _("/bin/sh"), sizeof(arg0));
520 arg[0] = arg0;
521 strncpy (arg1, _("-c"), sizeof(arg1));
522 arg[1] = arg1;
523 arg[2] = command;
524 arg[3] = NULL;
525
526 if (sh.timezone != NULL)
527 {
528 len = sl_strlen(sh.timezone) + 4;
529 envp[0] = malloc (len); /* free() ok */
530 if (envp[0] != NULL)
531 sl_snprintf (envp[0], len, "TZ=%s", sh.timezone);
532 else
533 envp[0] = NULL;
534 envp[1] = NULL;
535 }
536 else
537 {
538 envp[0] = NULL;
539 }
540
541
542 /* Create the pipe
543 */
544 if (aud_pipe(FIL__, __LINE__, pipedes) < 0) {
545 if (envp[0] != NULL) free(envp[0]);
546 SL_RETURN(NULL, _("sh_popen"));
547 }
548
549 fflush (NULL);
550
551 source->pid = aud_fork(FIL__, __LINE__);
552
553 /* Failure
554 */
555 if (source->pid == (pid_t) - 1) {
556 close(pipedes[0]);
557 close(pipedes[1]);
558 if (envp[0] != NULL) free(envp[0]);
559 SL_RETURN(NULL, _("sh_popen"));
560 }
561
562 if (source->pid == (pid_t) 0)
563 {
564
565 /* child - make read side of the pipe stdout
566 */
567 if (retry_aud_dup2(FIL__, __LINE__,
568 pipedes[STDOUT_FILENO], STDOUT_FILENO) < 0)
569 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
570
571 /* close the pipe descriptors
572 */
573 close (pipedes[STDIN_FILENO]);
574 close (pipedes[STDOUT_FILENO]);
575
576 /* don't leak file descriptors
577 */
578 sh_unix_closeall (3, -1); /* in child process */
579
580 /* zero priv info
581 */
582 memset(skey, 0, sizeof(sh_key_t));
583
584 /* drop root privileges
585 */
586 i = 0;
587 if (0 == geteuid())
588 {
589#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
590 struct passwd pwd;
591 char buffer[SH_PWBUF_SIZE];
592 struct passwd * tempres;
593 sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, sizeof(buffer), &tempres);
594#else
595 struct passwd * tempres = sh_getpwnam(DEFAULT_IDENT);
596#endif
597
598 if (NULL != tempres) {
599 i = aud_setgid(FIL__, __LINE__, tempres->pw_gid);
600 if (i == 0)
601 i = sh_unix_initgroups(DEFAULT_IDENT ,tempres->pw_gid);
602 if (i == 0)
603 i = aud_setuid(FIL__, __LINE__, tempres->pw_uid);
604 /* make sure we cannot get root again
605 */
606 if ((tempres->pw_uid != 0) && (aud_setuid(FIL__, __LINE__, 0) >= 0))
607 i = -1;
608 } else {
609 i = -1;
610 }
611 }
612
613 /* some problem ...
614 */
615 if (i == -1) {
616 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
617 }
618
619 freopen (_("/dev/null"), "r+", stderr);
620
621 /* exec the program */
622 retry_aud_execve (FIL__, __LINE__, _("/bin/sh"), arg, envp);
623
624 /* failed
625 */
626 aud__exit(FIL__, __LINE__, EXIT_FAILURE);
627 }
628
629 /* parent
630 */
631 if (envp[0] != NULL)
632 free(envp[0]);
633
634 close (pipedes[STDOUT_FILENO]);
635 retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
636
637 outf = fdopen (pipedes[STDIN_FILENO], "r");
638
639 if (outf == NULL)
640 {
641 aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
642 close (pipedes[STDOUT_FILENO]);
643 waitpid (source->pid, NULL, 0);
644 source->pid = 0;
645 SL_RETURN(NULL, _("sh_popen"));
646 }
647
648 SL_RETURN(outf, _("sh_popen"));
649}
650
651
652static int sh_pclose (sourcetable_t *source)
653{
654 int status = 0;
655 int retval;
656 char msg[128];
657 char errbuf[SH_ERRBUF_SIZE];
658
659 SL_ENTER(_("sh_pclose"));
660
661 retval = fclose(source->pipe);
662 if (retval)
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 SL_RETURN((-1), _("sh_pclose"));
669 }
670
671 retval = waitpid(source->pid, &status, 0);
672 if (retval != source->pid)
673 {
674 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
675 MSG_E_SUBGEN,
676 sh_error_message(retval, errbuf, sizeof(errbuf)),
677 _("sh_pclose"));
678
679 status = -1;
680 }
681 else if (WIFSIGNALED(status))
682 {
683 sl_snprintf(msg, sizeof(msg), _("Subprocess terminated by signal %d"),
684 WTERMSIG(status));
685 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
686 MSG_E_SUBGEN,
687 msg,
688 _("sh_pclose"));
689 status = -1;
690 }
691
692 source->pipe = NULL;
693 source->pid = 0;
694 SL_RETURN(status, _("sh_pclose"));
695}
696
697#define BUF_ENT 32766
698
699/* Poll the system for randomness, mix results with
700 * previous reads using a hash function, and give out
701 * nbytes bytes from the result.
702 */
703int sh_entropy(int nbytes, char * nbuf)
704{
705 int caperr;
706 char combuf[80];
707 char * buffer;
708 int i, j, icount;
709 int bufcount = 0;
710 int count;
711
712 char * keybuf;
713 UINT32 kbuf[KEY_BYT/sizeof(UINT32)];
714 char addbuf[2 * KEY_BYT];
715
716 struct timeval tv;
717 fd_set fds;
718 unsigned long select_now = 0;
719 int maxFD = 0;
720 int imax, selcount;
721 char errbuf[SH_ERRBUF_SIZE];
722
723 sourcetable_t *source = NULL;
724
725 SL_ENTER(_("sh_entropy"));
726
727 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
728
729 if (nbytes > KEY_BYT)
730 nbytes = KEY_BYT;
731
732
733 /* --- If there is entropy in the pool, return it. ---
734 */
735 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
736 if (skey->poolc >= nbytes)
737 {
738 j = KEY_BYT - skey->poolc;
739 for (i = 0; i < nbytes; ++i)
740 {
741 nbuf[i] = skey->poolv[i+j];
742 --skey->poolc;
743 }
744 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey); /* alternative path */
745 SL_RETURN(0, _("sh_entropy"));
746 }
747 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
748
749
750 FD_ZERO(&fds);
751
752 i = 0; icount = 0;
753 buffer = SH_ALLOC(BUF_ENT+2);
754
755 if (0 != (caperr = sl_get_cap_sub()))
756 {
757 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
758 sh_error_message (caperr, errbuf, sizeof(errbuf)),
759 _("sl_get_cap_sub"));
760 }
761
762 while (source_template[i].command != NULL) {
763 ++i;
764 }
765 source = SH_ALLOC(i * sizeof(sourcetable_t));
766 for (j = 0; j < i;++j)
767 memcpy(&source[j], &source_template[j], sizeof(sourcetable_t));
768 i = 0;
769
770 while (source[i].command != NULL) {
771
772 j = 0;
773 while (com_path[j] != NULL)
774 {
775 sl_strlcpy(combuf, _(com_path[j]), 80);
776 sl_strlcat(combuf, _(source[i].command), 80);
777
778 /* flawfinder: ignore */
779 if ( access (combuf, X_OK) == 0)
780 {
781 sl_strlcpy(combuf, _(com_path[j]), 80);
782 sl_strlcat(combuf, _(source[i].arg), 80);
783 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENSTART,
784 combuf);
785 break;
786 }
787 ++j;
788 }
789
790 /* Not found, try next command.
791 */
792 if (com_path[j] == NULL)
793 {
794 ++i;
795 continue;
796 }
797
798 /* Source exists
799 */
800 source[i].pipe = sh_popen ( &source[i], combuf );
801 if (NULL != source[i].pipe)
802 {
803 source[i].pipeFD = fileno ( source[i].pipe );
804 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENEXEC,
805 combuf, (long) source[i].pipeFD);
806
807 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
808 retry_fcntl( FIL__, __LINE__, source[i].pipeFD, F_SETFL, O_NONBLOCK);
809 FD_SET( source[i].pipeFD, &fds );
810 source[i].isset = 1;
811 ++icount;
812 }
813 else
814 {
815 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENFAIL,
816 combuf);
817 }
818
819 ++i;
820 }
821
822 imax = i;
823 tv.tv_sec = 1;
824 tv.tv_usec = 0;
825 bufcount = 0;
826
827 while ( (icount > 0) && (bufcount < BUF_ENT) ) {
828
829 if ( (selcount = select (maxFD+1, &fds, NULL, NULL, &tv)) == -1)
830 break;
831
832 /* reset timeout for select()
833 */
834 tv.tv_sec = 1;
835 tv.tv_usec = 0;
836
837 /* timeout - let's not hang on forever
838 */
839 if (selcount == 0)
840 {
841 ++select_now;
842 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENTOUT,
843 (unsigned long) select_now);
844 if ( select_now > 9 )
845 break;
846 }
847
848 for (i = 0; i < imax; ++i) {
849
850 if ( FD_ISSET (source[i].pipeFD, &fds) ) {
851 count = fread (&buffer[bufcount],
852 1,
853 BUF_ENT-bufcount,
854 source[i].pipe );
855 if (count == 0)
856 {
857 if (0 != feof(source[i].pipe))
858 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS,
859 (long) source[i].pipeFD);
860 else
861 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS1,
862 (long) source[i].pipeFD);
863 source[i].isset = 0;
864 sh_pclose ( &source[i] );
865 --icount;
866 }
867 else
868 {
869 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENREAD,
870 (long) source[i].pipeFD, (long) count);
871 }
872 bufcount += count;
873
874 }
875 }
876
877 maxFD = 0;
878 FD_ZERO(&fds);
879
880 for (i = 0; i < imax; ++i)
881 {
882 if (source[i].isset == 1)
883 {
884 FD_SET( source[i].pipeFD, &fds );
885 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
886 }
887 }
888 }
889
890 for (i = 0; i < imax; ++i)
891 {
892 if (source[i].isset == 1)
893 {
894 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENCLOS1,
895 (long) source[i].pipeFD);
896 sh_pclose ( &source[i] );
897 }
898 }
899 buffer[bufcount] = '\0';
900
901 SH_FREE(source);
902
903 if (0 != (caperr = sl_drop_cap_sub()))
904 {
905 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
906 sh_error_message (caperr, errbuf, sizeof(errbuf)),
907 _("sl_drop_cap_sub"));
908 }
909
910 if (bufcount > 0)
911 {
912 keybuf = (char *) sh_tiger_hash_uint32 (buffer,
913 TIGER_DATA, sl_strlen(buffer),
914 kbuf, KEY_BYT/sizeof(UINT32));
915
916 /* add previous entropy into the new pool
917 */
918 memset(addbuf, '\0', sizeof(addbuf));
919 for (i = 0; i < KEY_BYT; ++i)
920 {
921 addbuf[i] = keybuf[i];
922 addbuf[i+KEY_BYT] = skey->poolv[i];
923 }
924 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
925 TIGER_DATA, sizeof(addbuf),
926 kbuf, KEY_BYT/sizeof(UINT32));
927 memset(addbuf, '\0', sizeof(addbuf));
928
929 /* store in system pool
930 */
931 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
932 for (i = 0; i < KEY_BYT; ++i)
933 skey->poolv[i] = keybuf[i];
934 skey->poolc = KEY_BYT;
935 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
936 memset (buffer, '\0', BUF_ENT+2);
937 memset (keybuf, '\0', KEY_BYT);
938 SH_FREE(buffer);
939 }
940 else
941 {
942 SH_FREE(buffer);
943 SL_RETURN((-1), _("sh_entropy"));
944 }
945
946 /* give out nbytes Bytes from the entropy pool
947 */
948 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
949 for (i = 0; i < nbytes; ++i)
950 {
951 nbuf[i] = skey->poolv[i];
952 --skey->poolc;
953 }
954 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
955
956 SL_RETURN(0, _("sh_entropy"));
957}
958
959/* HAVE_UNIX_RANDOM */
960#endif
961
962
963
964
965
966
967
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