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entropy.c

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1/*-
2 * Copyright (c) 2001 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#ifdef WITH_OPENSSL-
28-
29#include <sys/types.h>-
30#include <sys/socket.h>-
31#ifdef HAVE_SYS_UN_H-
32# include <sys/un.h>-
33#endif-
34-
35#include <netinet/in.h>-
36#include <arpa/inet.h>-
37-
38#include <errno.h>-
39#include <signal.h>-
40#include <string.h>-
41#include <unistd.h>-
42#include <stddef.h> /* for offsetof */-
43-
44#include <openssl/rand.h>-
45#include <openssl/crypto.h>-
46#include <openssl/err.h>-
47-
48#include "openbsd-compat/openssl-compat.h"-
49-
50#include "ssh.h"-
51#include "misc.h"-
52#include "xmalloc.h"-
53#include "atomicio.h"-
54#include "pathnames.h"-
55#include "log.h"-
56#include "sshbuf.h"-
57#include "ssherr.h"-
58-
59/*-
60 * Portable OpenSSH PRNG seeding:-
61 * If OpenSSL has not "internally seeded" itself (e.g. pulled data from-
62 * /dev/random), then collect RANDOM_SEED_SIZE bytes of randomness from-
63 * PRNGd.-
64 */-
65#ifndef OPENSSL_PRNG_ONLY-
66-
67#define RANDOM_SEED_SIZE 48-
68-
69/*-
70 * Collect 'len' bytes of entropy into 'buf' from PRNGD/EGD daemon-
71 * listening either on 'tcp_port', or via Unix domain socket at *-
72 * 'socket_path'.-
73 * Either a non-zero tcp_port or a non-null socket_path must be-
74 * supplied.-
75 * Returns 0 on success, -1 on error-
76 */-
77int-
78get_random_bytes_prngd(unsigned char *buf, int len,-
79 unsigned short tcp_port, char *socket_path)-
80{-
81 int fd, addr_len, rval, errors;-
82 u_char msg[2];-
83 struct sockaddr_storage addr;-
84 struct sockaddr_in *addr_in = (struct sockaddr_in *)&addr;-
85 struct sockaddr_un *addr_un = (struct sockaddr_un *)&addr;-
86 mysig_t old_sigpipe;-
87-
88 /* Sanity checks */-
89 if (socket_path == NULL && tcp_port == 0)-
90 fatal("You must specify a port or a socket");-
91 if (socket_path != NULL &&-
92 strlen(socket_path) >= sizeof(addr_un->sun_path))-
93 fatal("Random pool path is too long");-
94 if (len <= 0 || len > 255)-
95 fatal("Too many bytes (%d) to read from PRNGD", len);-
96-
97 memset(&addr, '\0', sizeof(addr));-
98-
99 if (tcp_port != 0) {-
100 addr_in->sin_family = AF_INET;-
101 addr_in->sin_addr.s_addr = htonl(INADDR_LOOPBACK);-
102 addr_in->sin_port = htons(tcp_port);-
103 addr_len = sizeof(*addr_in);-
104 } else {-
105 addr_un->sun_family = AF_UNIX;-
106 strlcpy(addr_un->sun_path, socket_path,-
107 sizeof(addr_un->sun_path));-
108 addr_len = offsetof(struct sockaddr_un, sun_path) +-
109 strlen(socket_path) + 1;-
110 }-
111-
112 old_sigpipe = signal(SIGPIPE, SIG_IGN);-
113-
114 errors = 0;-
115 rval = -1;-
116reopen:-
117 fd = socket(addr.ss_family, SOCK_STREAM, 0);-
118 if (fd == -1) {-
119 error("Couldn't create socket: %s", strerror(errno));-
120 goto done;-
121 }-
122-
123 if (connect(fd, (struct sockaddr*)&addr, addr_len) == -1) {-
124 if (tcp_port != 0) {-
125 error("Couldn't connect to PRNGD port %d: %s",-
126 tcp_port, strerror(errno));-
127 } else {-
128 error("Couldn't connect to PRNGD socket \"%s\": %s",-
129 addr_un->sun_path, strerror(errno));-
130 }-
131 goto done;-
132 }-
133-
134 /* Send blocking read request to PRNGD */-
135 msg[0] = 0x02;-
136 msg[1] = len;-
137-
138 if (atomicio(vwrite, fd, msg, sizeof(msg)) != sizeof(msg)) {-
139 if (errno == EPIPE && errors < 10) {-
140 close(fd);-
141 errors++;-
142 goto reopen;-
143 }-
144 error("Couldn't write to PRNGD socket: %s",-
145 strerror(errno));-
146 goto done;-
147 }-
148-
149 if (atomicio(read, fd, buf, len) != (size_t)len) {-
150 if (errno == EPIPE && errors < 10) {-
151 close(fd);-
152 errors++;-
153 goto reopen;-
154 }-
155 error("Couldn't read from PRNGD socket: %s",-
156 strerror(errno));-
157 goto done;-
158 }-
159-
160 rval = 0;-
161done:-
162 signal(SIGPIPE, old_sigpipe);-
163 if (fd != -1)-
164 close(fd);-
165 return rval;-
166}-
167-
168static int-
169seed_from_prngd(unsigned char *buf, size_t bytes)-
170{-
171#ifdef PRNGD_PORT-
172 debug("trying egd/prngd port %d", PRNGD_PORT);-
173 if (get_random_bytes_prngd(buf, bytes, PRNGD_PORT, NULL) == 0)-
174 return 0;-
175#endif-
176#ifdef PRNGD_SOCKET-
177 debug("trying egd/prngd socket %s", PRNGD_SOCKET);-
178 if (get_random_bytes_prngd(buf, bytes, 0, PRNGD_SOCKET) == 0)-
179 return 0;-
180#endif-
181 return -1;-
182}-
183-
184void-
185rexec_send_rng_seed(struct sshbuf *m)-
186{-
187 u_char buf[RANDOM_SEED_SIZE];-
188 size_t len = sizeof(buf);-
189 int r;-
190-
191 if (RAND_bytes(buf, sizeof(buf)) <= 0) {-
192 error("Couldn't obtain random bytes (error %ld)",-
193 ERR_get_error());-
194 len = 0;-
195 }-
196 if ((r = sshbuf_put_string(m, buf, len)) != 0)-
197 fatal("%s: buffer error: %s", __func__, ssh_err(r));-
198 explicit_bzero(buf, sizeof(buf));-
199}-
200-
201void-
202rexec_recv_rng_seed(struct sshbuf *m)-
203{-
204 u_char *buf = NULL;-
205 size_t len = 0;-
206 int r;-
207-
208 if ((r = sshbuf_get_string_direct(m, &buf, &len)) != 0-
209 fatal("%s: buffer error: %s", __func__, ssh_err(r));-
210-
211 debug3("rexec_recv_rng_seed: seeding rng with %u bytes", len);-
212 RAND_add(buf, len, len);-
213}-
214#endif /* OPENSSL_PRNG_ONLY */-
215-
216void-
217seed_rng(void)-
218{-
219#ifndef OPENSSL_PRNG_ONLY-
220 unsigned char buf[RANDOM_SEED_SIZE];-
221#endif-
222 if (!ssh_compatible_openssl(OPENSSL_VERSION_NUMBER, SSLeay()))
!ssh_compatibl...fL , SSLeay())Description
TRUEnever evaluated
FALSEevaluated 30 times by 2 tests
Evaluated by:
  • ssh-keygen
  • sshd
0-30
223 fatal("OpenSSL version mismatch. Built against %lx, you "
never executed: fatal("OpenSSL version mismatch. Built against %lx, you " "have %lx", (u_long) 0x100020cfL , SSLeay());
0
224 "have %lx", (u_long)OPENSSL_VERSION_NUMBER, SSLeay());
never executed: fatal("OpenSSL version mismatch. Built against %lx, you " "have %lx", (u_long) 0x100020cfL , SSLeay());
0
225-
226#ifndef OPENSSL_PRNG_ONLY-
227 if (RAND_status() == 1) {-
228 debug3("RNG is ready, skipping seeding");-
229 return;-
230 }-
231-
232 if (seed_from_prngd(buf, sizeof(buf)) == -1)-
233 fatal("Could not obtain seed from PRNGd");-
234 RAND_add(buf, sizeof(buf), sizeof(buf));-
235 memset(buf, '\0', sizeof(buf));-
236-
237#endif /* OPENSSL_PRNG_ONLY */-
238 if (RAND_status() != 1)
RAND_status() != 1Description
TRUEnever evaluated
FALSEevaluated 30 times by 2 tests
Evaluated by:
  • ssh-keygen
  • sshd
0-30
239 fatal("PRNG is not seeded");
never executed: fatal("PRNG is not seeded");
0
240}
executed 30 times by 2 tests: end of block
Executed by:
  • ssh-keygen
  • sshd
30
241-
242#else /* WITH_OPENSSL */-
243-
244/* Handled in arc4random() */-
245void-
246seed_rng(void)-
247{-
248}-
249-
250#endif /* WITH_OPENSSL */-
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