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e9a17296 1/*
2 * Copyright (c) 2001-2002 Damien Miller. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "includes.h"
26
27#include <openssl/rand.h>
28#include <openssl/sha.h>
29#include <openssl/crypto.h>
30
31/* SunOS 4.4.4 needs this */
32#ifdef HAVE_FLOATINGPOINT_H
33# include <floatingpoint.h>
34#endif /* HAVE_FLOATINGPOINT_H */
35
36#include "misc.h"
37#include "xmalloc.h"
38#include "atomicio.h"
39#include "pathnames.h"
40#include "log.h"
41
42RCSID("$Id$");
43
44/* Number of bytes we write out */
45#define OUTPUT_SEED_SIZE 48
46
47/* Length of on-disk seedfiles */
48#define SEED_FILE_SIZE 1024
49
50/* Maximum number of command-line arguments to read from file */
51#define NUM_ARGS 10
52
53/* Minimum number of usable commands to be considered sufficient */
54#define MIN_ENTROPY_SOURCES 16
55
56/* Path to on-disk seed file (relative to user's home directory */
57#ifndef SSH_PRNG_SEED_FILE
58# define SSH_PRNG_SEED_FILE _PATH_SSH_USER_DIR"/prng_seed"
59#endif
60
ae43c103 61/* Path to PRNG commands list (from pathnames.c) */
62extern char *SSH_PRNG_COMMAND_FILE;
e9a17296 63
e9a17296 64extern char *__progname;
e9a17296 65
66#define WHITESPACE " \t\n"
67
68#ifndef RUSAGE_SELF
69# define RUSAGE_SELF 0
70#endif
71#ifndef RUSAGE_CHILDREN
72# define RUSAGE_CHILDREN 0
73#endif
74
75#if !defined(PRNGD_SOCKET) && !defined(PRNGD_PORT)
76# define USE_SEED_FILES
77#endif
78
79typedef struct {
80 /* Proportion of data that is entropy */
81 double rate;
82 /* Counter goes positive if this command times out */
83 unsigned int badness;
84 /* Increases by factor of two each timeout */
85 unsigned int sticky_badness;
86 /* Path to executable */
87 char *path;
88 /* argv to pass to executable */
89 char *args[NUM_ARGS]; /* XXX: arbitrary limit */
90 /* full command string (debug) */
91 char *cmdstring;
92} entropy_cmd_t;
93
94/* slow command timeouts (all in milliseconds) */
95/* static int entropy_timeout_default = ENTROPY_TIMEOUT_MSEC; */
96static int entropy_timeout_current = ENTROPY_TIMEOUT_MSEC;
97
98/* this is initialised from a file, by prng_read_commands() */
99static entropy_cmd_t *entropy_cmds = NULL;
100
101/* Prototypes */
102double stir_from_system(void);
103double stir_from_programs(void);
104double stir_gettimeofday(double entropy_estimate);
105double stir_clock(double entropy_estimate);
106double stir_rusage(int who, double entropy_estimate);
e54b3d7c 107double hash_command_output(entropy_cmd_t *src, unsigned char *hash);
416fd2a8 108int get_random_bytes_prngd(unsigned char *buf, int len,
e9a17296 109 unsigned short tcp_port, char *socket_path);
110
111/*
112 * Collect 'len' bytes of entropy into 'buf' from PRNGD/EGD daemon
113 * listening either on 'tcp_port', or via Unix domain socket at *
114 * 'socket_path'.
416fd2a8 115 * Either a non-zero tcp_port or a non-null socket_path must be
e9a17296 116 * supplied.
117 * Returns 0 on success, -1 on error
118 */
119int
416fd2a8 120get_random_bytes_prngd(unsigned char *buf, int len,
e9a17296 121 unsigned short tcp_port, char *socket_path)
122{
123 int fd, addr_len, rval, errors;
124 char msg[2];
125 struct sockaddr_storage addr;
126 struct sockaddr_in *addr_in = (struct sockaddr_in *)&addr;
127 struct sockaddr_un *addr_un = (struct sockaddr_un *)&addr;
128 mysig_t old_sigpipe;
129
130 /* Sanity checks */
131 if (socket_path == NULL && tcp_port == 0)
132 fatal("You must specify a port or a socket");
133 if (socket_path != NULL &&
134 strlen(socket_path) >= sizeof(addr_un->sun_path))
135 fatal("Random pool path is too long");
136 if (len > 255)
137 fatal("Too many bytes to read from PRNGD");
138
139 memset(&addr, '\0', sizeof(addr));
140
141 if (tcp_port != 0) {
142 addr_in->sin_family = AF_INET;
143 addr_in->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
144 addr_in->sin_port = htons(tcp_port);
145 addr_len = sizeof(*addr_in);
146 } else {
147 addr_un->sun_family = AF_UNIX;
148 strlcpy(addr_un->sun_path, socket_path,
149 sizeof(addr_un->sun_path));
150 addr_len = offsetof(struct sockaddr_un, sun_path) +
151 strlen(socket_path) + 1;
152 }
153
154 old_sigpipe = mysignal(SIGPIPE, SIG_IGN);
155
156 errors = 0;
157 rval = -1;
158reopen:
159 fd = socket(addr.ss_family, SOCK_STREAM, 0);
160 if (fd == -1) {
161 error("Couldn't create socket: %s", strerror(errno));
162 goto done;
163 }
164
165 if (connect(fd, (struct sockaddr*)&addr, addr_len) == -1) {
166 if (tcp_port != 0) {
167 error("Couldn't connect to PRNGD port %d: %s",
168 tcp_port, strerror(errno));
169 } else {
170 error("Couldn't connect to PRNGD socket \"%s\": %s",
171 addr_un->sun_path, strerror(errno));
172 }
173 goto done;
174 }
175
176 /* Send blocking read request to PRNGD */
177 msg[0] = 0x02;
178 msg[1] = len;
179
70791e56 180 if (atomicio(vwrite, fd, msg, sizeof(msg)) != sizeof(msg)) {
e9a17296 181 if (errno == EPIPE && errors < 10) {
182 close(fd);
183 errors++;
184 goto reopen;
185 }
186 error("Couldn't write to PRNGD socket: %s",
187 strerror(errno));
188 goto done;
189 }
190
191 if (atomicio(read, fd, buf, len) != len) {
192 if (errno == EPIPE && errors < 10) {
193 close(fd);
194 errors++;
195 goto reopen;
196 }
197 error("Couldn't read from PRNGD socket: %s",
198 strerror(errno));
199 goto done;
200 }
201
202 rval = 0;
203done:
204 mysignal(SIGPIPE, old_sigpipe);
205 if (fd != -1)
206 close(fd);
207 return rval;
208}
209
210double
211stir_gettimeofday(double entropy_estimate)
212{
213 struct timeval tv;
214
215 if (gettimeofday(&tv, NULL) == -1)
216 fatal("Couldn't gettimeofday: %s", strerror(errno));
217
218 RAND_add(&tv, sizeof(tv), entropy_estimate);
219
220 return entropy_estimate;
221}
222
223double
224stir_clock(double entropy_estimate)
225{
226#ifdef HAVE_CLOCK
227 clock_t c;
228
229 c = clock();
230 RAND_add(&c, sizeof(c), entropy_estimate);
231
232 return entropy_estimate;
233#else /* _HAVE_CLOCK */
234 return 0;
235#endif /* _HAVE_CLOCK */
236}
237
238double
239stir_rusage(int who, double entropy_estimate)
240{
241#ifdef HAVE_GETRUSAGE
242 struct rusage ru;
243
244 if (getrusage(who, &ru) == -1)
245 return 0;
246
247 RAND_add(&ru, sizeof(ru), entropy_estimate);
248
249 return entropy_estimate;
250#else /* _HAVE_GETRUSAGE */
251 return 0;
252#endif /* _HAVE_GETRUSAGE */
253}
254
255static int
256timeval_diff(struct timeval *t1, struct timeval *t2)
257{
258 int secdiff, usecdiff;
259
260 secdiff = t2->tv_sec - t1->tv_sec;
261 usecdiff = (secdiff*1000000) + (t2->tv_usec - t1->tv_usec);
262 return (int)(usecdiff / 1000);
263}
264
265double
e54b3d7c 266hash_command_output(entropy_cmd_t *src, unsigned char *hash)
e9a17296 267{
268 char buf[8192];
269 fd_set rdset;
270 int bytes_read, cmd_eof, error_abort, msec_elapsed, p[2];
271 int status, total_bytes_read;
272 static int devnull = -1;
273 pid_t pid;
274 SHA_CTX sha;
275 struct timeval tv_start, tv_current;
276
277 debug3("Reading output from \'%s\'", src->cmdstring);
278
279 if (devnull == -1) {
280 devnull = open("/dev/null", O_RDWR);
281 if (devnull == -1)
416fd2a8 282 fatal("Couldn't open /dev/null: %s",
e9a17296 283 strerror(errno));
284 }
285
286 if (pipe(p) == -1)
287 fatal("Couldn't open pipe: %s", strerror(errno));
288
289 (void)gettimeofday(&tv_start, NULL); /* record start time */
290
291 switch (pid = fork()) {
292 case -1: /* Error */
293 close(p[0]);
294 close(p[1]);
295 fatal("Couldn't fork: %s", strerror(errno));
296 /* NOTREACHED */
297 case 0: /* Child */
298 dup2(devnull, STDIN_FILENO);
299 dup2(p[1], STDOUT_FILENO);
300 dup2(p[1], STDERR_FILENO);
301 close(p[0]);
302 close(p[1]);
303 close(devnull);
304
305 execv(src->path, (char**)(src->args));
306
416fd2a8 307 debug("(child) Couldn't exec '%s': %s",
e9a17296 308 src->cmdstring, strerror(errno));
309 _exit(-1);
310 default: /* Parent */
311 break;
312 }
313
314 RAND_add(&pid, sizeof(&pid), 0.0);
315
316 close(p[1]);
317
318 /* Hash output from child */
319 SHA1_Init(&sha);
320
321 cmd_eof = error_abort = msec_elapsed = total_bytes_read = 0;
322 while (!error_abort && !cmd_eof) {
323 int ret;
324 struct timeval tv;
325 int msec_remaining;
326
327 (void) gettimeofday(&tv_current, 0);
328 msec_elapsed = timeval_diff(&tv_start, &tv_current);
329 if (msec_elapsed >= entropy_timeout_current) {
330 error_abort=1;
331 continue;
332 }
333 msec_remaining = entropy_timeout_current - msec_elapsed;
334
335 FD_ZERO(&rdset);
336 FD_SET(p[0], &rdset);
337 tv.tv_sec = msec_remaining / 1000;
338 tv.tv_usec = (msec_remaining % 1000) * 1000;
339
340 ret = select(p[0] + 1, &rdset, NULL, NULL, &tv);
341
342 RAND_add(&tv, sizeof(tv), 0.0);
343
344 switch (ret) {
345 case 0:
346 /* timer expired */
347 error_abort = 1;
1c14df9e 348 kill(pid, SIGINT);
e9a17296 349 break;
350 case 1:
351 /* command input */
352 do {
353 bytes_read = read(p[0], buf, sizeof(buf));
354 } while (bytes_read == -1 && errno == EINTR);
355 RAND_add(&bytes_read, sizeof(&bytes_read), 0.0);
356 if (bytes_read == -1) {
357 error_abort = 1;
358 break;
359 } else if (bytes_read) {
360 SHA1_Update(&sha, buf, bytes_read);
361 total_bytes_read += bytes_read;
362 } else {
363 cmd_eof = 1;
364 }
365 break;
366 case -1:
367 default:
368 /* error */
416fd2a8 369 debug("Command '%s': select() failed: %s",
e9a17296 370 src->cmdstring, strerror(errno));
371 error_abort = 1;
372 break;
373 }
374 }
375
376 SHA1_Final(hash, &sha);
377
378 close(p[0]);
379
380 debug3("Time elapsed: %d msec", msec_elapsed);
381
382 if (waitpid(pid, &status, 0) == -1) {
383 error("Couldn't wait for child '%s' completion: %s",
ff2d7a98 384 src->cmdstring, strerror(errno));
e9a17296 385 return 0.0;
386 }
387
388 RAND_add(&status, sizeof(&status), 0.0);
389
390 if (error_abort) {
391 /*
392 * Closing p[0] on timeout causes the entropy command to
416fd2a8 393 * SIGPIPE. Take whatever output we got, and mark this
394 * command as slow
e9a17296 395 */
396 debug2("Command '%s' timed out", src->cmdstring);
397 src->sticky_badness *= 2;
398 src->badness = src->sticky_badness;
399 return total_bytes_read;
400 }
401
402 if (WIFEXITED(status)) {
403 if (WEXITSTATUS(status) == 0) {
404 return total_bytes_read;
405 } else {
406 debug2("Command '%s' exit status was %d",
407 src->cmdstring, WEXITSTATUS(status));
408 src->badness = src->sticky_badness = 128;
409 return 0.0;
410 }
411 } else if (WIFSIGNALED(status)) {
412 debug2("Command '%s' returned on uncaught signal %d !",
413 src->cmdstring, status);
414 src->badness = src->sticky_badness = 128;
415 return 0.0;
416 } else
417 return 0.0;
418}
419
420double
421stir_from_system(void)
422{
423 double total_entropy_estimate;
424 long int i;
425
426 total_entropy_estimate = 0;
427
428 i = getpid();
429 RAND_add(&i, sizeof(i), 0.5);
430 total_entropy_estimate += 0.1;
431
432 i = getppid();
433 RAND_add(&i, sizeof(i), 0.5);
434 total_entropy_estimate += 0.1;
435
436 i = getuid();
437 RAND_add(&i, sizeof(i), 0.0);
438 i = getgid();
439 RAND_add(&i, sizeof(i), 0.0);
440
441 total_entropy_estimate += stir_gettimeofday(1.0);
442 total_entropy_estimate += stir_clock(0.5);
443 total_entropy_estimate += stir_rusage(RUSAGE_SELF, 2.0);
444
445 return total_entropy_estimate;
446}
447
448double
449stir_from_programs(void)
450{
451 int c;
452 double entropy, total_entropy;
e54b3d7c 453 unsigned char hash[SHA_DIGEST_LENGTH];
e9a17296 454
455 total_entropy = 0;
456 for(c = 0; entropy_cmds[c].path != NULL; c++) {
457 if (!entropy_cmds[c].badness) {
458 /* Hash output from command */
459 entropy = hash_command_output(&entropy_cmds[c],
460 hash);
461
462 /* Scale back estimate by command's rate */
463 entropy *= entropy_cmds[c].rate;
464
465 /* Upper bound of entropy is SHA_DIGEST_LENGTH */
466 if (entropy > SHA_DIGEST_LENGTH)
467 entropy = SHA_DIGEST_LENGTH;
468
469 /* Stir it in */
470 RAND_add(hash, sizeof(hash), entropy);
471
416fd2a8 472 debug3("Got %0.2f bytes of entropy from '%s'",
e9a17296 473 entropy, entropy_cmds[c].cmdstring);
474
475 total_entropy += entropy;
476
477 /* Execution time should be a bit unpredictable */
478 total_entropy += stir_gettimeofday(0.05);
479 total_entropy += stir_clock(0.05);
480 total_entropy += stir_rusage(RUSAGE_SELF, 0.1);
481 total_entropy += stir_rusage(RUSAGE_CHILDREN, 0.1);
482 } else {
483 debug2("Command '%s' disabled (badness %d)",
416fd2a8 484 entropy_cmds[c].cmdstring,
e9a17296 485 entropy_cmds[c].badness);
486
487 if (entropy_cmds[c].badness > 0)
488 entropy_cmds[c].badness--;
489 }
490 }
491
492 return total_entropy;
493}
494
495/*
496 * prng seedfile functions
497 */
498int
499prng_check_seedfile(char *filename)
500{
501 struct stat st;
502
503 /*
416fd2a8 504 * XXX raceable: eg replace seed between this stat and subsequent
505 * open. Not such a problem because we don't really trust the
e9a17296 506 * seed file anyway.
507 * XXX: use secure path checking as elsewhere in OpenSSH
508 */
509 if (lstat(filename, &st) == -1) {
510 /* Give up on hard errors */
511 if (errno != ENOENT)
512 debug("WARNING: Couldn't stat random seed file "
513 "\"%.100s\": %s", filename, strerror(errno));
514 return 0;
515 }
516
517 /* regular file? */
518 if (!S_ISREG(st.st_mode))
519 fatal("PRNG seedfile %.100s is not a regular file",
520 filename);
521
522 /* mode 0600, owned by root or the current user? */
523 if (((st.st_mode & 0177) != 0) || !(st.st_uid == getuid())) {
524 debug("WARNING: PRNG seedfile %.100s must be mode 0600, "
70791e56 525 "owned by uid %li", filename, (long int)getuid());
e9a17296 526 return 0;
527 }
528
529 return 1;
530}
531
532void
533prng_write_seedfile(void)
534{
535 int fd;
e54b3d7c 536 unsigned char seed[SEED_FILE_SIZE];
537 char filename[MAXPATHLEN];
e9a17296 538 struct passwd *pw;
539
540 pw = getpwuid(getuid());
541 if (pw == NULL)
542 fatal("Couldn't get password entry for current user "
70791e56 543 "(%li): %s", (long int)getuid(), strerror(errno));
e9a17296 544
545 /* Try to ensure that the parent directory is there */
546 snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir,
547 _PATH_SSH_USER_DIR);
548 mkdir(filename, 0700);
549
550 snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir,
551 SSH_PRNG_SEED_FILE);
552
553 debug("writing PRNG seed to file %.100s", filename);
554
1c14df9e 555 if (RAND_bytes(seed, sizeof(seed)) <= 0)
416fd2a8 556 fatal("PRNG seed extraction failed");
e9a17296 557
558 /* Don't care if the seed doesn't exist */
559 prng_check_seedfile(filename);
560
561 if ((fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0600)) == -1) {
562 debug("WARNING: couldn't access PRNG seedfile %.100s "
563 "(%.100s)", filename, strerror(errno));
564 } else {
70791e56 565 if (atomicio(vwrite, fd, &seed, sizeof(seed)) < sizeof(seed))
e9a17296 566 fatal("problem writing PRNG seedfile %.100s "
567 "(%.100s)", filename, strerror(errno));
568 close(fd);
569 }
570}
571
572void
573prng_read_seedfile(void)
574{
575 int fd;
576 char seed[SEED_FILE_SIZE], filename[MAXPATHLEN];
577 struct passwd *pw;
578
579 pw = getpwuid(getuid());
580 if (pw == NULL)
581 fatal("Couldn't get password entry for current user "
70791e56 582 "(%li): %s", (long int)getuid(), strerror(errno));
e9a17296 583
584 snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir,
585 SSH_PRNG_SEED_FILE);
586
587 debug("loading PRNG seed from file %.100s", filename);
588
589 if (!prng_check_seedfile(filename)) {
590 verbose("Random seed file not found or invalid, ignoring.");
591 return;
592 }
593
594 /* open the file and read in the seed */
595 fd = open(filename, O_RDONLY);
596 if (fd == -1)
597 fatal("could not open PRNG seedfile %.100s (%.100s)",
598 filename, strerror(errno));
599
600 if (atomicio(read, fd, &seed, sizeof(seed)) < sizeof(seed)) {
601 verbose("invalid or short read from PRNG seedfile "
602 "%.100s - ignoring", filename);
603 memset(seed, '\0', sizeof(seed));
604 }
605 close(fd);
606
607 /* stir in the seed, with estimated entropy zero */
608 RAND_add(&seed, sizeof(seed), 0.0);
609}
610
611
612/*
613 * entropy command initialisation functions
614 */
615int
616prng_read_commands(char *cmdfilename)
617{
618 char cmd[SEED_FILE_SIZE], *cp, line[1024], path[SEED_FILE_SIZE];
619 double est;
620 entropy_cmd_t *entcmd;
621 FILE *f;
622 int cur_cmd, linenum, num_cmds, arg;
623
624 if ((f = fopen(cmdfilename, "r")) == NULL) {
625 fatal("couldn't read entropy commands file %.100s: %.100s",
626 cmdfilename, strerror(errno));
627 }
628
629 num_cmds = 64;
630 entcmd = xmalloc(num_cmds * sizeof(entropy_cmd_t));
631 memset(entcmd, '\0', num_cmds * sizeof(entropy_cmd_t));
632
633 /* Read in file */
634 cur_cmd = linenum = 0;
635 while (fgets(line, sizeof(line), f)) {
636 linenum++;
637
638 /* Skip leading whitespace, blank lines and comments */
639 cp = line + strspn(line, WHITESPACE);
640 if ((*cp == 0) || (*cp == '#'))
641 continue; /* done with this line */
642
643 /*
416fd2a8 644 * The first non-whitespace char should be a double quote
e9a17296 645 * delimiting the commandline
646 */
647 if (*cp != '"') {
648 error("bad entropy command, %.100s line %d",
649 cmdfilename, linenum);
650 continue;
651 }
652
653 /*
654 * First token, command args (incl. argv[0]) in double
655 * quotes
656 */
657 cp = strtok(cp, "\"");
658 if (cp == NULL) {
659 error("missing or bad command string, %.100s "
660 "line %d -- ignored", cmdfilename, linenum);
661 continue;
662 }
663 strlcpy(cmd, cp, sizeof(cmd));
664
665 /* Second token, full command path */
666 if ((cp = strtok(NULL, WHITESPACE)) == NULL) {
667 error("missing command path, %.100s "
668 "line %d -- ignored", cmdfilename, linenum);
669 continue;
670 }
671
672 /* Did configure mark this as dead? */
673 if (strncmp("undef", cp, 5) == 0)
674 continue;
675
676 strlcpy(path, cp, sizeof(path));
677
678 /* Third token, entropy rate estimate for this command */
679 if ((cp = strtok(NULL, WHITESPACE)) == NULL) {
680 error("missing entropy estimate, %.100s "
681 "line %d -- ignored", cmdfilename, linenum);
682 continue;
683 }
684 est = strtod(cp, NULL);
685
686 /* end of line */
687 if ((cp = strtok(NULL, WHITESPACE)) != NULL) {
688 error("garbage at end of line %d in %.100s "
689 "-- ignored", linenum, cmdfilename);
690 continue;
691 }
692
693 /* save the command for debug messages */
694 entcmd[cur_cmd].cmdstring = xstrdup(cmd);
695
696 /* split the command args */
697 cp = strtok(cmd, WHITESPACE);
698 arg = 0;
699 do {
700 entcmd[cur_cmd].args[arg] = xstrdup(cp);
701 arg++;
702 } while(arg < NUM_ARGS && (cp = strtok(NULL, WHITESPACE)));
703
704 if (strtok(NULL, WHITESPACE))
705 error("ignored extra commands (max %d), %.100s "
706 "line %d", NUM_ARGS, cmdfilename, linenum);
707
708 /* Copy the command path and rate estimate */
709 entcmd[cur_cmd].path = xstrdup(path);
710 entcmd[cur_cmd].rate = est;
711
712 /* Initialise other values */
713 entcmd[cur_cmd].sticky_badness = 1;
714
715 cur_cmd++;
716
717 /*
718 * If we've filled the array, reallocate it twice the size
416fd2a8 719 * Do this now because even if this we're on the last
e9a17296 720 * command we need another slot to mark the last entry
721 */
722 if (cur_cmd == num_cmds) {
723 num_cmds *= 2;
724 entcmd = xrealloc(entcmd, num_cmds *
725 sizeof(entropy_cmd_t));
726 }
727 }
728
729 /* zero the last entry */
730 memset(&entcmd[cur_cmd], '\0', sizeof(entropy_cmd_t));
731
732 /* trim to size */
733 entropy_cmds = xrealloc(entcmd, (cur_cmd + 1) *
734 sizeof(entropy_cmd_t));
735
736 debug("Loaded %d entropy commands from %.100s", cur_cmd,
737 cmdfilename);
738
739 return cur_cmd < MIN_ENTROPY_SOURCES ? -1 : 0;
740}
741
2980ea68 742void
743usage(void)
744{
745 fprintf(stderr, "Usage: %s [options]\n", __progname);
746 fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
747 fprintf(stderr, " Multiple -v increases verbosity.\n");
748 fprintf(stderr, " -x Force output in hexidecimal (for debugging)\n");
749 fprintf(stderr, " -X Force output in binary\n");
750 fprintf(stderr, " -b bytes Number of bytes to output (default %d)\n",
751 OUTPUT_SEED_SIZE);
752}
753
416fd2a8 754int
e9a17296 755main(int argc, char **argv)
756{
2980ea68 757 unsigned char *buf;
758 int ret, ch, debug_level, output_hex, bytes;
759 extern char *optarg;
760 LogLevel ll;
e9a17296 761
70791e56 762 __progname = ssh_get_progname(argv[0]);
ae43c103 763 init_pathnames();
e9a17296 764 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
765
2980ea68 766 ll = SYSLOG_LEVEL_INFO;
767 debug_level = output_hex = 0;
768 bytes = OUTPUT_SEED_SIZE;
769
770 /* Don't write binary data to a tty, unless we are forced to */
771 if (isatty(STDOUT_FILENO))
772 output_hex = 1;
416fd2a8 773
2980ea68 774 while ((ch = getopt(argc, argv, "vxXhb:")) != -1) {
775 switch (ch) {
776 case 'v':
777 if (debug_level < 3)
778 ll = SYSLOG_LEVEL_DEBUG1 + debug_level++;
779 break;
780 case 'x':
781 output_hex = 1;
782 break;
783 case 'X':
784 output_hex = 0;
785 break;
786 case 'b':
787 if ((bytes = atoi(optarg)) <= 0)
788 fatal("Invalid number of output bytes");
789 break;
790 case 'h':
791 usage();
792 exit(0);
793 default:
794 error("Invalid commandline option");
795 usage();
796 }
797 }
798
799 log_init(argv[0], ll, SYSLOG_FACILITY_USER, 1);
416fd2a8 800
e9a17296 801#ifdef USE_SEED_FILES
802 prng_read_seedfile();
803#endif
804
2980ea68 805 buf = xmalloc(bytes);
806
e9a17296 807 /*
808 * Seed the RNG from wherever we can
809 */
416fd2a8 810
e9a17296 811 /* Take whatever is on the stack, but don't credit it */
2980ea68 812 RAND_add(buf, bytes, 0);
e9a17296 813
416fd2a8 814 debug("Seeded RNG with %i bytes from system calls",
e9a17296 815 (int)stir_from_system());
816
817#ifdef PRNGD_PORT
2980ea68 818 if (get_random_bytes_prngd(buf, bytes, PRNGD_PORT, NULL) == -1)
e9a17296 819 fatal("Entropy collection failed");
2980ea68 820 RAND_add(buf, bytes, bytes);
e9a17296 821#elif defined(PRNGD_SOCKET)
2980ea68 822 if (get_random_bytes_prngd(buf, bytes, 0, PRNGD_SOCKET) == -1)
e9a17296 823 fatal("Entropy collection failed");
2980ea68 824 RAND_add(buf, bytes, bytes);
e9a17296 825#else
826 /* Read in collection commands */
827 if (prng_read_commands(SSH_PRNG_COMMAND_FILE) == -1)
828 fatal("PRNG initialisation failed -- exiting.");
416fd2a8 829 debug("Seeded RNG with %i bytes from programs",
e9a17296 830 (int)stir_from_programs());
831#endif
832
833#ifdef USE_SEED_FILES
834 prng_write_seedfile();
835#endif
836
837 /*
838 * Write the seed to stdout
839 */
840
841 if (!RAND_status())
842 fatal("Not enough entropy in RNG");
843
1c14df9e 844 if (RAND_bytes(buf, bytes) <= 0)
845 fatal("Couldn't extract entropy from PRNG");
e9a17296 846
2980ea68 847 if (output_hex) {
848 for(ret = 0; ret < bytes; ret++)
849 printf("%02x", (unsigned char)(buf[ret]));
850 printf("\n");
851 } else
70791e56 852 ret = atomicio(vwrite, STDOUT_FILENO, buf, bytes);
416fd2a8 853
2980ea68 854 memset(buf, '\0', bytes);
855 xfree(buf);
416fd2a8 856
2980ea68 857 return ret == bytes ? 0 : 1;
e9a17296 858}
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