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authorbeck <>2016-09-03 11:33:43 +0000
committerbeck <>2016-09-03 11:33:43 +0000
commit839327196dbc0dd6ca80811d25a0b2bf18060cb7 (patch)
treebda3f96ee18135da341fa9b72de3608609a4f2b7 /src/lib/libcrypto/crypto/getentropy_hpux.c
parent68562b91f88d1a8511c997984c90fcdf0e29fc1f (diff)
downloadopenbsd-839327196dbc0dd6ca80811d25a0b2bf18060cb7.tar.gz
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Remove the libcrypto/crypto directory
Diffstat (limited to 'src/lib/libcrypto/crypto/getentropy_hpux.c')
-rw-r--r--src/lib/libcrypto/crypto/getentropy_hpux.c419
1 files changed, 0 insertions, 419 deletions
diff --git a/src/lib/libcrypto/crypto/getentropy_hpux.c b/src/lib/libcrypto/crypto/getentropy_hpux.c
deleted file mode 100644
index 3ae6a6aa42..0000000000
--- a/src/lib/libcrypto/crypto/getentropy_hpux.c
+++ /dev/null
@@ -1,419 +0,0 @@
1/* $OpenBSD: getentropy_hpux.c,v 1.5 2016/08/07 03:27:21 tb Exp $ */
2
3/*
4 * Copyright (c) 2014 Theo de Raadt <deraadt@openbsd.org>
5 * Copyright (c) 2014 Bob Beck <beck@obtuse.com>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 *
19 * Emulation of getentropy(2) as documented at:
20 * http://man.openbsd.org/getentropy.2
21 */
22
23#include <sys/types.h>
24#include <sys/param.h>
25#include <sys/ioctl.h>
26#include <sys/resource.h>
27#include <sys/syscall.h>
28#include <sys/statvfs.h>
29#include <sys/socket.h>
30#include <sys/mount.h>
31#include <sys/mman.h>
32#include <sys/stat.h>
33#include <sys/time.h>
34#include <stdlib.h>
35#include <stdint.h>
36#include <stdio.h>
37#include <termios.h>
38#include <fcntl.h>
39#include <signal.h>
40#include <string.h>
41#include <errno.h>
42#include <unistd.h>
43#include <time.h>
44#include <openssl/sha.h>
45
46#include <sys/vfs.h>
47
48#include <sys/pstat.h>
49
50#define REPEAT 5
51#define min(a, b) (((a) < (b)) ? (a) : (b))
52
53#define HX(a, b) \
54 do { \
55 if ((a)) \
56 HD(errno); \
57 else \
58 HD(b); \
59 } while (0)
60
61#define HR(x, l) (SHA512_Update(&ctx, (char *)(x), (l)))
62#define HD(x) (SHA512_Update(&ctx, (char *)&(x), sizeof (x)))
63#define HF(x) (SHA512_Update(&ctx, (char *)&(x), sizeof (void*)))
64
65int getentropy(void *buf, size_t len);
66
67static int gotdata(char *buf, size_t len);
68static int getentropy_urandom(void *buf, size_t len, const char *path,
69 int devfscheck);
70static int getentropy_fallback(void *buf, size_t len);
71
72int
73getentropy(void *buf, size_t len)
74{
75 int ret = -1;
76
77 if (len > 256) {
78 errno = EIO;
79 return (-1);
80 }
81
82 /*
83 * Try to get entropy with /dev/urandom
84 */
85 ret = getentropy_urandom(buf, len, "/dev/urandom", 0);
86 if (ret != -1)
87 return (ret);
88
89 /*
90 * Entropy collection via /dev/urandom has failed.
91 *
92 * No other API exists for collecting entropy, and we have
93 * no failsafe way to get it on hpux that is not sensitive
94 * to resource exhaustion.
95 *
96 * We have very few options:
97 * - Even syslog_r is unsafe to call at this low level, so
98 * there is no way to alert the user or program.
99 * - Cannot call abort() because some systems have unsafe
100 * corefiles.
101 * - Could raise(SIGKILL) resulting in silent program termination.
102 * - Return EIO, to hint that arc4random's stir function
103 * should raise(SIGKILL)
104 * - Do the best under the circumstances....
105 *
106 * This code path exists to bring light to the issue that hpux
107 * does not provide a failsafe API for entropy collection.
108 *
109 * We hope this demonstrates that hpux should consider
110 * providing a new failsafe API which works in a chroot or
111 * when file descriptors are exhausted.
112 */
113#undef FAIL_INSTEAD_OF_TRYING_FALLBACK
114#ifdef FAIL_INSTEAD_OF_TRYING_FALLBACK
115 raise(SIGKILL);
116#endif
117 ret = getentropy_fallback(buf, len);
118 if (ret != -1)
119 return (ret);
120
121 errno = EIO;
122 return (ret);
123}
124
125/*
126 * Basic sanity checking; wish we could do better.
127 */
128static int
129gotdata(char *buf, size_t len)
130{
131 char any_set = 0;
132 size_t i;
133
134 for (i = 0; i < len; ++i)
135 any_set |= buf[i];
136 if (any_set == 0)
137 return (-1);
138 return (0);
139}
140
141static int
142getentropy_urandom(void *buf, size_t len, const char *path, int devfscheck)
143{
144 struct stat st;
145 size_t i;
146 int fd, flags;
147 int save_errno = errno;
148
149start:
150
151 flags = O_RDONLY;
152#ifdef O_NOFOLLOW
153 flags |= O_NOFOLLOW;
154#endif
155#ifdef O_CLOEXEC
156 flags |= O_CLOEXEC;
157#endif
158 fd = open(path, flags, 0);
159 if (fd == -1) {
160 if (errno == EINTR)
161 goto start;
162 goto nodevrandom;
163 }
164#ifndef O_CLOEXEC
165 fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
166#endif
167
168 /* Lightly verify that the device node looks sane */
169 if (fstat(fd, &st) == -1 || !S_ISCHR(st.st_mode)) {
170 close(fd);
171 goto nodevrandom;
172 }
173 for (i = 0; i < len; ) {
174 size_t wanted = len - i;
175 ssize_t ret = read(fd, (char *)buf + i, wanted);
176
177 if (ret == -1) {
178 if (errno == EAGAIN || errno == EINTR)
179 continue;
180 close(fd);
181 goto nodevrandom;
182 }
183 i += ret;
184 }
185 close(fd);
186 if (gotdata(buf, len) == 0) {
187 errno = save_errno;
188 return (0); /* satisfied */
189 }
190nodevrandom:
191 errno = EIO;
192 return (-1);
193}
194
195static const int cl[] = {
196 CLOCK_REALTIME,
197#ifdef CLOCK_MONOTONIC
198 CLOCK_MONOTONIC,
199#endif
200#ifdef CLOCK_MONOTONIC_RAW
201 CLOCK_MONOTONIC_RAW,
202#endif
203#ifdef CLOCK_TAI
204 CLOCK_TAI,
205#endif
206#ifdef CLOCK_VIRTUAL
207 CLOCK_VIRTUAL,
208#endif
209#ifdef CLOCK_UPTIME
210 CLOCK_UPTIME,
211#endif
212#ifdef CLOCK_PROCESS_CPUTIME_ID
213 CLOCK_PROCESS_CPUTIME_ID,
214#endif
215#ifdef CLOCK_THREAD_CPUTIME_ID
216 CLOCK_THREAD_CPUTIME_ID,
217#endif
218};
219
220static int
221getentropy_fallback(void *buf, size_t len)
222{
223 uint8_t results[SHA512_DIGEST_LENGTH];
224 int save_errno = errno, e, pgs = sysconf(_SC_PAGESIZE), faster = 0, repeat;
225 static int cnt;
226 struct timespec ts;
227 struct timeval tv;
228 struct pst_vminfo pvi;
229 struct pst_vm_status pvs;
230 struct pst_dynamic pdy;
231 struct rusage ru;
232 sigset_t sigset;
233 struct stat st;
234 SHA512_CTX ctx;
235 static pid_t lastpid;
236 pid_t pid;
237 size_t i, ii, m;
238 char *p;
239
240 pid = getpid();
241 if (lastpid == pid) {
242 faster = 1;
243 repeat = 2;
244 } else {
245 faster = 0;
246 lastpid = pid;
247 repeat = REPEAT;
248 }
249 for (i = 0; i < len; ) {
250 int j;
251 SHA512_Init(&ctx);
252 for (j = 0; j < repeat; j++) {
253 HX((e = gettimeofday(&tv, NULL)) == -1, tv);
254 if (e != -1) {
255 cnt += (int)tv.tv_sec;
256 cnt += (int)tv.tv_usec;
257 }
258
259 HX(pstat_getvminfo(&pvi, sizeof(pvi), 1, 0) != 1, pvi);
260 HX(pstat_getprocvm(&pvs, sizeof(pvs), 0, 0) != 1, pvs);
261
262 for (ii = 0; ii < sizeof(cl)/sizeof(cl[0]); ii++)
263 HX(clock_gettime(cl[ii], &ts) == -1, ts);
264
265 HX((pid = getpid()) == -1, pid);
266 HX((pid = getsid(pid)) == -1, pid);
267 HX((pid = getppid()) == -1, pid);
268 HX((pid = getpgid(0)) == -1, pid);
269 HX((e = getpriority(0, 0)) == -1, e);
270
271 if(pstat_getdynamic(&pdy, sizeof(pdy), 1, 0) != 1) {
272 HD(errno);
273 } else {
274 HD(pdy.psd_avg_1_min);
275 HD(pdy.psd_avg_5_min);
276 HD(pdy.psd_avg_15_min);
277 }
278
279 if (!faster) {
280 ts.tv_sec = 0;
281 ts.tv_nsec = 1;
282 (void) nanosleep(&ts, NULL);
283 }
284
285 HX(sigpending(&sigset) == -1, sigset);
286 HX(sigprocmask(SIG_BLOCK, NULL, &sigset) == -1,
287 sigset);
288
289 HF(getentropy); /* an addr in this library */
290 HF(printf); /* an addr in libc */
291 p = (char *)&p;
292 HD(p); /* an addr on stack */
293 p = (char *)&errno;
294 HD(p); /* the addr of errno */
295
296 if (i == 0) {
297 struct sockaddr_storage ss;
298 struct statvfs stvfs;
299 struct termios tios;
300 socklen_t ssl;
301 off_t off;
302
303 /*
304 * Prime-sized mappings encourage fragmentation;
305 * thus exposing some address entropy.
306 */
307 struct mm {
308 size_t npg;
309 void *p;
310 } mm[] = {
311 { 17, MAP_FAILED }, { 3, MAP_FAILED },
312 { 11, MAP_FAILED }, { 2, MAP_FAILED },
313 { 5, MAP_FAILED }, { 3, MAP_FAILED },
314 { 7, MAP_FAILED }, { 1, MAP_FAILED },
315 { 57, MAP_FAILED }, { 3, MAP_FAILED },
316 { 131, MAP_FAILED }, { 1, MAP_FAILED },
317 };
318
319 for (m = 0; m < sizeof mm/sizeof(mm[0]); m++) {
320 HX(mm[m].p = mmap(NULL,
321 mm[m].npg * pgs,
322 PROT_READ|PROT_WRITE,
323 MAP_PRIVATE|MAP_ANON, -1,
324 (off_t)0), mm[m].p);
325 if (mm[m].p != MAP_FAILED) {
326 size_t mo;
327
328 /* Touch some memory... */
329 p = mm[m].p;
330 mo = cnt %
331 (mm[m].npg * pgs - 1);
332 p[mo] = 1;
333 cnt += (int)((long)(mm[m].p)
334 / pgs);
335 }
336
337 /* Check cnts and times... */
338 for (ii = 0; ii < sizeof(cl)/sizeof(cl[0]);
339 ii++) {
340 HX((e = clock_gettime(cl[ii],
341 &ts)) == -1, ts);
342 if (e != -1)
343 cnt += (int)ts.tv_nsec;
344 }
345
346 HX((e = getrusage(RUSAGE_SELF,
347 &ru)) == -1, ru);
348 if (e != -1) {
349 cnt += (int)ru.ru_utime.tv_sec;
350 cnt += (int)ru.ru_utime.tv_usec;
351 }
352 }
353
354 for (m = 0; m < sizeof mm/sizeof(mm[0]); m++) {
355 if (mm[m].p != MAP_FAILED)
356 munmap(mm[m].p, mm[m].npg * pgs);
357 mm[m].p = MAP_FAILED;
358 }
359
360 HX(stat(".", &st) == -1, st);
361 HX(statvfs(".", &stvfs) == -1, stvfs);
362
363 HX(stat("/", &st) == -1, st);
364 HX(statvfs("/", &stvfs) == -1, stvfs);
365
366 HX((e = fstat(0, &st)) == -1, st);
367 if (e == -1) {
368 if (S_ISREG(st.st_mode) ||
369 S_ISFIFO(st.st_mode) ||
370 S_ISSOCK(st.st_mode)) {
371 HX(fstatvfs(0, &stvfs) == -1,
372 stvfs);
373 HX((off = lseek(0, (off_t)0,
374 SEEK_CUR)) < 0, off);
375 }
376 if (S_ISCHR(st.st_mode)) {
377 HX(tcgetattr(0, &tios) == -1,
378 tios);
379 } else if (S_ISSOCK(st.st_mode)) {
380 memset(&ss, 0, sizeof ss);
381 ssl = sizeof(ss);
382 HX(getpeername(0,
383 (void *)&ss, &ssl) == -1,
384 ss);
385 }
386 }
387
388 HX((e = getrusage(RUSAGE_CHILDREN,
389 &ru)) == -1, ru);
390 if (e != -1) {
391 cnt += (int)ru.ru_utime.tv_sec;
392 cnt += (int)ru.ru_utime.tv_usec;
393 }
394 } else {
395 /* Subsequent hashes absorb previous result */
396 HD(results);
397 }
398
399 HX((e = gettimeofday(&tv, NULL)) == -1, tv);
400 if (e != -1) {
401 cnt += (int)tv.tv_sec;
402 cnt += (int)tv.tv_usec;
403 }
404
405 HD(cnt);
406 }
407 SHA512_Final(results, &ctx);
408 memcpy((char *)buf + i, results, min(sizeof(results), len - i));
409 i += min(sizeof(results), len - i);
410 }
411 explicit_bzero(&ctx, sizeof ctx);
412 explicit_bzero(results, sizeof results);
413 if (gotdata(buf, len) == 0) {
414 errno = save_errno;
415 return (0); /* satisfied */
416 }
417 errno = EIO;
418 return (-1);
419}
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