source: trunk/src/sh_entropy.c@ 429

Last change on this file since 429 was 345, checked in by katerina, 14 years ago

Fix for ticket #253: support /opt/local/bin in entropy gatherer
File size: 22.9 KB
RevLine 
[1]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{
[135]119 int fd = -1;
[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 ) {
[252]140 sl_close_fd(FIL__, __LINE__, fd );
[1]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;
[171]149 int retval;
[1]150
[135]151#ifdef EGD_SOCKET_NAME
[1]152 bname = EGD_SOCKET_NAME;
[135]153#endif
[1]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;
[22]173 sl_strlcpy( addr.sun_path, name, sizeof(addr.sun_path) );
[1]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 }
[171]187 do {
188 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
189 } while (retval < 0 && (errno == EINTR || errno == EINPROGRESS));
190 if( retval == -1 )
[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);
[252]197 sl_close_fd(FIL__, __LINE__, fd);
[1]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"),
[135]213 _("sh_entropy") );
[252]214 sl_close_fd(FIL__, __LINE__, fd);
[1]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"),
[135]255 _("sh_entropy") );
[252]256 sl_close_fd(FIL__, __LINE__, fd);
[1]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) );
[252]276 sl_close_fd(FIL__, __LINE__, fd);
[1]277 SL_RETURN( 0, _("sh_entropy") ); /* success */
278}
279
280/* HAVE_EGD_RANDOM */
281#endif
282
283#if defined (HAVE_URANDOM)
284
[135]285#include "sh_pthread.h"
286
[170]287int read_mbytes(int timeout_val, const char * path, char * nbuf, int nbytes)
[1]288{
[131]289 int m_count;
[1]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
[78]297 * readable.
[1]298 */
[78]299 if (0 == sh_unix_device_readable(fd2))
[1]300 {
[147]301 m_count = sl_read_timeout_fd(fd2, nbuf, nbytes,
[131]302 timeout_val, SL_FALSE);
303 if (m_count < 0)
304 m_count = 0;
[1]305 }
306 else
307 m_count = 0;
308 }
309 else
310 m_count = 0;
311
[252]312 sl_close_fd(FIL__, __LINE__, fd2);
[131]313
[1]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;
[133]326 UINT32 kbuf[KEY_BYT/sizeof(UINT32)];
[1]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
[138]339 m_count = read_mbytes ( 1, NAME_OF_DEV_RANDOM, nbuf, nbytes);
[1]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,
[133]378 TIGER_DATA, 2 * KEY_BYT,
379 kbuf, KEY_BYT/sizeof(UINT32));
[1]380 memset(addbuf, '\0', sizeof(addbuf));
381
382 /* -- Give out nbytes bytes from the new pool. --
383 */
[135]384 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
[1]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 }
[135]391 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
[1]392 memset (keybuf, '\0', KEY_BYT);
[147]393 memset (kbuf, '\0', sizeof(kbuf));
[1]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"
[135]422#include "sh_pthread.h"
[1]423
424static
425char * com_path[] = {
[30]426 N_("/usr/bin/xpg4/"),
[1]427 N_("/usr/ucb/"),
428 N_("/bin/"),
429 N_("/sbin/"),
430 N_("/usr/bin/"),
431 N_("/usr/sbin/"),
432 N_("/usr/local/bin/"),
[345]433 N_("/opt/local/bin/"),
[1]434 NULL
435};
436
437
438typedef struct {
439 char * command;
440 char * arg;
441 int pipeFD;
442 pid_t pid;
443 int isset;
444 FILE * pipe;
445} sourcetable_t;
446
447static
[135]448sourcetable_t source_template[] = {
[1]449 { N_("w"),
450 N_("w"),
451 0,
452 0,
453 0,
454 NULL },
455 { N_("netstat"),
456 N_("netstat -n"),
457 0,
458 0,
459 0,
460 NULL },
461 { N_("ps"),
462 N_("ps -ef"),
463 0,
464 0,
465 0,
466 NULL },
467 { N_("arp"),
468 N_("arp -a"),
469 0,
470 0,
471 0,
472 NULL },
473 { N_("free"),
474 N_("free"),
475 0,
476 0,
477 0,
478 NULL },
479 { N_("uptime"),
480 N_("uptime"),
481 0,
482 0,
483 0,
484 NULL },
485 { N_("procinfo"),
486 N_("procinfo -a"),
487 0,
488 0,
489 0,
490 NULL },
491 { N_("vmstat"),
492 N_("vmstat"),
493 0,
494 0,
495 0,
496 NULL },
497 { N_("w"), /* Play it again, Sam. */
498 N_("w"),
499 0,
500 0,
501 0,
502 NULL },
503 { NULL,
504 NULL,
505 0,
506 0,
507 0,
508 NULL }
509};
510
511
512static FILE * sh_popen (sourcetable_t *source, char * command)
513{
514 int i;
515 int pipedes[2];
516 FILE *outf = NULL;
517 char * arg[4];
518 char * envp[2];
[22]519 size_t len;
[32]520 char arg0[80];
521 char arg1[80];
[1]522
[319]523#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
524 struct passwd pwd;
525 char * buffer;
526 struct passwd * tempres;
527#else
528 struct passwd * tempres;
529#endif
530
[1]531 SL_ENTER(_("sh_popen"));
532
[319]533#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
534 buffer = SH_ALLOC(SH_PWBUF_SIZE);
535 sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, SH_PWBUF_SIZE, &tempres);
536#else
537 tempres = sh_getpwnam(DEFAULT_IDENT);
538#endif
539
[32]540 strncpy (arg0, _("/bin/sh"), sizeof(arg0));
541 arg[0] = arg0;
542 strncpy (arg1, _("-c"), sizeof(arg1));
543 arg[1] = arg1;
[1]544 arg[2] = command;
545 arg[3] = NULL;
546
547 if (sh.timezone != NULL)
548 {
[22]549 len = sl_strlen(sh.timezone) + 4;
550 envp[0] = malloc (len); /* free() ok */
[1]551 if (envp[0] != NULL)
[22]552 sl_snprintf (envp[0], len, "TZ=%s", sh.timezone);
[1]553 else
554 envp[0] = NULL;
555 envp[1] = NULL;
556 }
557 else
558 {
559 envp[0] = NULL;
560 }
561
562
563 /* Create the pipe
564 */
565 if (aud_pipe(FIL__, __LINE__, pipedes) < 0) {
566 if (envp[0] != NULL) free(envp[0]);
567 SL_RETURN(NULL, _("sh_popen"));
568 }
569
[102]570 fflush (NULL);
571
[1]572 source->pid = aud_fork(FIL__, __LINE__);
573
574 /* Failure
575 */
576 if (source->pid == (pid_t) - 1) {
[252]577 sl_close_fd(FIL__, __LINE__, pipedes[0]);
578 sl_close_fd(FIL__, __LINE__, pipedes[1]);
[1]579 if (envp[0] != NULL) free(envp[0]);
580 SL_RETURN(NULL, _("sh_popen"));
581 }
582
583 if (source->pid == (pid_t) 0)
584 {
[235]585 int val_return;
[1]586
587 /* child - make read side of the pipe stdout
588 */
[235]589 do {
590 val_return = dup2 (pipedes[STDOUT_FILENO], STDOUT_FILENO);
591 } while (val_return < 0 && errno == EINTR);
592
593 if (val_return < 0)
594 _exit(EXIT_FAILURE);
[1]595
596 /* close the pipe descriptors
597 */
[252]598 sl_close_fd (FIL__, __LINE__, pipedes[STDIN_FILENO]);
599 sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
[1]600
601 /* don't leak file descriptors
602 */
[174]603 sh_unix_closeall (3, -1, SL_TRUE); /* in child process */
[1]604
605 /* zero priv info
606 */
607 memset(skey, 0, sizeof(sh_key_t));
608
609 /* drop root privileges
610 */
611 i = 0;
[131]612 if (0 == geteuid())
613 {
614
615 if (NULL != tempres) {
[235]616 i = setgid(tempres->pw_gid);
[131]617 if (i == 0)
618 i = sh_unix_initgroups(DEFAULT_IDENT ,tempres->pw_gid);
619 if (i == 0)
[235]620 i = setuid(tempres->pw_uid);
[131]621 /* make sure we cannot get root again
622 */
[235]623 if ((tempres->pw_uid != 0) &&
624 (setuid(0) >= 0))
[131]625 i = -1;
626 } else {
[1]627 i = -1;
[131]628 }
[1]629 }
630
631 /* some problem ...
632 */
633 if (i == -1) {
[235]634 _exit(EXIT_FAILURE);
[1]635 }
636
[153]637 if (NULL != freopen (_("/dev/null"), "r+", stderr))
638 {
[1]639
[153]640 /* exec the program */
[235]641 do {
642 val_return = execve (_("/bin/sh"), arg, envp);
643 } while (val_return < 0 && errno == EINTR);
[153]644 }
645
[1]646 /* failed
647 */
[235]648 _exit(EXIT_FAILURE);
[1]649 }
650
[319]651 /* parent
652 */
653#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
654 SH_FREE(buffer);
655#endif
[1]656
[319]657 if (envp[0] != NULL)
658 free(envp[0]);
659
660 sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
661 retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
662
663 outf = fdopen (pipedes[STDIN_FILENO], "r");
664
665 if (outf == NULL)
666 {
667 aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
668 sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
669 waitpid (source->pid, NULL, 0);
670 source->pid = 0;
671 SL_RETURN(NULL, _("sh_popen"));
672 }
673
674 SL_RETURN(outf, _("sh_popen"));
[1]675}
676
677
678static int sh_pclose (sourcetable_t *source)
679{
680 int status = 0;
[32]681 int retval;
682 char msg[128];
[132]683 char errbuf[SH_ERRBUF_SIZE];
[1]684
685 SL_ENTER(_("sh_pclose"));
686
[252]687 retval = sl_fclose(FIL__, __LINE__, source->pipe);
[32]688 if (retval)
[1]689 {
[32]690 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
691 MSG_E_SUBGEN,
[132]692 sh_error_message(retval, errbuf, sizeof(errbuf)),
[32]693 _("sh_pclose"));
[1]694 SL_RETURN((-1), _("sh_pclose"));
695 }
696
[32]697 retval = waitpid(source->pid, &status, 0);
698 if (retval != source->pid)
699 {
700 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
701 MSG_E_SUBGEN,
[132]702 sh_error_message(retval, errbuf, sizeof(errbuf)),
[32]703 _("sh_pclose"));
[1]704
[32]705 status = -1;
706 }
[171]707#if !defined(USE_UNO)
[32]708 else if (WIFSIGNALED(status))
709 {
710 sl_snprintf(msg, sizeof(msg), _("Subprocess terminated by signal %d"),
711 WTERMSIG(status));
712 sh_error_handle (SH_ERR_ALL, FIL__, __LINE__, retval,
713 MSG_E_SUBGEN,
714 msg,
715 _("sh_pclose"));
716 status = -1;
717 }
[171]718#endif
[32]719
[1]720 source->pipe = NULL;
721 source->pid = 0;
722 SL_RETURN(status, _("sh_pclose"));
723}
724
725#define BUF_ENT 32766
726
727/* Poll the system for randomness, mix results with
728 * previous reads using a hash function, and give out
729 * nbytes bytes from the result.
730 */
731int sh_entropy(int nbytes, char * nbuf)
732{
733 int caperr;
734 char combuf[80];
735 char * buffer;
736 int i, j, icount;
737 int bufcount = 0;
738 int count;
739
740 char * keybuf;
[133]741 UINT32 kbuf[KEY_BYT/sizeof(UINT32)];
[1]742 char addbuf[2 * KEY_BYT];
743
744 struct timeval tv;
745 fd_set fds;
746 unsigned long select_now = 0;
747 int maxFD = 0;
748 int imax, selcount;
[132]749 char errbuf[SH_ERRBUF_SIZE];
[135]750
751 sourcetable_t *source = NULL;
[132]752
[1]753 SL_ENTER(_("sh_entropy"));
754
755 ASSERT((nbytes <= KEY_BYT), _("nbytes <= KEY_BYT"))
756
757 if (nbytes > KEY_BYT)
758 nbytes = KEY_BYT;
759
760
761 /* --- If there is entropy in the pool, return it. ---
762 */
[135]763 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
[1]764 if (skey->poolc >= nbytes)
765 {
766 j = KEY_BYT - skey->poolc;
767 for (i = 0; i < nbytes; ++i)
768 {
769 nbuf[i] = skey->poolv[i+j];
770 --skey->poolc;
771 }
[135]772 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey); /* alternative path */
[1]773 SL_RETURN(0, _("sh_entropy"));
774 }
[135]775 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
[1]776
777
778 FD_ZERO(&fds);
779
780 i = 0; icount = 0;
781 buffer = SH_ALLOC(BUF_ENT+2);
782
783 if (0 != (caperr = sl_get_cap_sub()))
784 {
785 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
[132]786 sh_error_message (caperr, errbuf, sizeof(errbuf)),
[1]787 _("sl_get_cap_sub"));
788 }
789
[135]790 while (source_template[i].command != NULL) {
791 ++i;
792 }
793 source = SH_ALLOC(i * sizeof(sourcetable_t));
794 for (j = 0; j < i;++j)
795 memcpy(&source[j], &source_template[j], sizeof(sourcetable_t));
796 i = 0;
797
[154]798 while (source_template[i].command != NULL) {
[1]799
800 j = 0;
801 while (com_path[j] != NULL)
802 {
803 sl_strlcpy(combuf, _(com_path[j]), 80);
804 sl_strlcat(combuf, _(source[i].command), 80);
805
[22]806 /* flawfinder: ignore */
[1]807 if ( access (combuf, X_OK) == 0)
808 {
809 sl_strlcpy(combuf, _(com_path[j]), 80);
810 sl_strlcat(combuf, _(source[i].arg), 80);
811 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENSTART,
812 combuf);
813 break;
814 }
815 ++j;
816 }
817
818 /* Not found, try next command.
819 */
820 if (com_path[j] == NULL)
821 {
822 ++i;
823 continue;
824 }
825
826 /* Source exists
827 */
828 source[i].pipe = sh_popen ( &source[i], combuf );
829 if (NULL != source[i].pipe)
830 {
831 source[i].pipeFD = fileno ( source[i].pipe );
832 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENEXEC,
833 combuf, (long) source[i].pipeFD);
834
835 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
836 retry_fcntl( FIL__, __LINE__, source[i].pipeFD, F_SETFL, O_NONBLOCK);
837 FD_SET( source[i].pipeFD, &fds );
838 source[i].isset = 1;
839 ++icount;
840 }
841 else
842 {
843 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENFAIL,
844 combuf);
845 }
846
847 ++i;
848 }
849
850 imax = i;
851 tv.tv_sec = 1;
852 tv.tv_usec = 0;
853 bufcount = 0;
854
855 while ( (icount > 0) && (bufcount < BUF_ENT) ) {
856
857 if ( (selcount = select (maxFD+1, &fds, NULL, NULL, &tv)) == -1)
858 break;
859
860 /* reset timeout for select()
861 */
862 tv.tv_sec = 1;
863 tv.tv_usec = 0;
864
865 /* timeout - let's not hang on forever
866 */
867 if (selcount == 0)
868 {
869 ++select_now;
870 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENTOUT,
871 (unsigned long) select_now);
872 if ( select_now > 9 )
873 break;
874 }
875
876 for (i = 0; i < imax; ++i) {
877
878 if ( FD_ISSET (source[i].pipeFD, &fds) ) {
879 count = fread (&buffer[bufcount],
880 1,
881 BUF_ENT-bufcount,
882 source[i].pipe );
883 if (count == 0)
884 {
885 if (0 != feof(source[i].pipe))
886 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS,
887 (long) source[i].pipeFD);
888 else
889 sh_error_handle ((-1), FIL__, __LINE__, EIO, MSG_ENCLOS1,
890 (long) source[i].pipeFD);
891 source[i].isset = 0;
892 sh_pclose ( &source[i] );
893 --icount;
894 }
895 else
896 {
897 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENREAD,
898 (long) source[i].pipeFD, (long) count);
899 }
900 bufcount += count;
901
902 }
903 }
904
905 maxFD = 0;
906 FD_ZERO(&fds);
907
908 for (i = 0; i < imax; ++i)
909 {
910 if (source[i].isset == 1)
911 {
912 FD_SET( source[i].pipeFD, &fds );
913 maxFD = (source[i].pipeFD > maxFD) ? source[i].pipeFD : maxFD;
914 }
915 }
916 }
917
918 for (i = 0; i < imax; ++i)
919 {
920 if (source[i].isset == 1)
921 {
922 sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_ENCLOS1,
923 (long) source[i].pipeFD);
924 sh_pclose ( &source[i] );
925 }
926 }
927 buffer[bufcount] = '\0';
[135]928
929 SH_FREE(source);
[1]930
931 if (0 != (caperr = sl_drop_cap_sub()))
932 {
933 sh_error_handle((-1), FIL__, __LINE__, caperr, MSG_E_SUBGEN,
[132]934 sh_error_message (caperr, errbuf, sizeof(errbuf)),
[1]935 _("sl_drop_cap_sub"));
936 }
937
938 if (bufcount > 0)
939 {
940 keybuf = (char *) sh_tiger_hash_uint32 (buffer,
[133]941 TIGER_DATA, sl_strlen(buffer),
942 kbuf, KEY_BYT/sizeof(UINT32));
[1]943
944 /* add previous entropy into the new pool
945 */
946 memset(addbuf, '\0', sizeof(addbuf));
947 for (i = 0; i < KEY_BYT; ++i)
948 {
949 addbuf[i] = keybuf[i];
950 addbuf[i+KEY_BYT] = skey->poolv[i];
951 }
952 keybuf = (char *) sh_tiger_hash_uint32 (addbuf,
[133]953 TIGER_DATA, sizeof(addbuf),
954 kbuf, KEY_BYT/sizeof(UINT32));
[1]955 memset(addbuf, '\0', sizeof(addbuf));
956
957 /* store in system pool
958 */
[135]959 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
[1]960 for (i = 0; i < KEY_BYT; ++i)
961 skey->poolv[i] = keybuf[i];
962 skey->poolc = KEY_BYT;
[135]963 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
[1]964 memset (buffer, '\0', BUF_ENT+2);
965 memset (keybuf, '\0', KEY_BYT);
966 SH_FREE(buffer);
967 }
968 else
969 {
970 SH_FREE(buffer);
971 SL_RETURN((-1), _("sh_entropy"));
972 }
973
974 /* give out nbytes Bytes from the entropy pool
975 */
[135]976 SH_MUTEX_LOCK_UNSAFE(mutex_skey);
[1]977 for (i = 0; i < nbytes; ++i)
978 {
979 nbuf[i] = skey->poolv[i];
980 --skey->poolc;
981 }
[135]982 SH_MUTEX_UNLOCK_UNSAFE(mutex_skey);
[1]983
984 SL_RETURN(0, _("sh_entropy"));
985}
986
987/* HAVE_UNIX_RANDOM */
988#endif
989
[147]990#ifdef SH_CUTEST
991#include "CuTest.h"
[1]992
[147]993void Test_entropy (CuTest *tc)
994{
995 char bufx[9 * sizeof(UINT32) + 1];
996 char bufy[9 * sizeof(UINT32) + 1];
997 int status;
[1]998
[147]999 memset(skey->poolv, '\0', KEY_BYT);
[1]1000
[147]1001 status = sh_entropy (24, bufx);
1002 CuAssertTrue(tc, 0 == status);
[1]1003
[147]1004 memset(skey->poolv, '\0', KEY_BYT);
[1]1005
[147]1006 status = sh_entropy (24, bufy);
1007 CuAssertTrue(tc, 0 == status);
[1]1008
[147]1009 CuAssertTrue(tc, 0 != memcmp(bufx, bufy, 24));
1010}
1011#endif
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