Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000 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 | * 3. All advertising materials mentioning features or use of this software |
| 13 | * must display the following acknowledgement: |
| 14 | * This product includes software developed by Markus Friedl. |
| 15 | * 4. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include "includes.h" |
| 31 | |
| 32 | #include "ssh.h" |
| 33 | #include "xmalloc.h" |
| 34 | |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 35 | #include <openssl/rand.h> |
| 36 | #include <openssl/sha.h> |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 37 | |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame^] | 38 | RCSID("$Id: entropy.c,v 1.14 2000/06/18 04:07:04 djm Exp $"); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 39 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 40 | #ifndef offsetof |
| 41 | # define offsetof(type, member) ((size_t) &((type *)0)->member) |
| 42 | #endif |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 43 | |
| 44 | /* Print lots of detail */ |
| 45 | /* #define DEBUG_ENTROPY */ |
| 46 | |
| 47 | /* Number of times to pass through command list gathering entropy */ |
| 48 | #define NUM_ENTROPY_RUNS 1 |
| 49 | |
| 50 | /* Scale entropy estimates back by this amount on subsequent runs */ |
| 51 | #define SCALE_PER_RUN 10.0 |
| 52 | |
| 53 | /* Minimum number of commands to be considered valid */ |
| 54 | #define MIN_ENTROPY_SOURCES 16 |
| 55 | |
| 56 | #define WHITESPACE " \t\n" |
| 57 | |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame^] | 58 | #ifndef RUSAGE_SELF |
| 59 | # define RUSAGE_SELF 0 |
| 60 | #endif |
| 61 | #ifndef RUSAGE_CHILDREN |
| 62 | # define RUSAGE_CHILDREN 0 |
| 63 | #endif |
| 64 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 65 | #if defined(EGD_SOCKET) || defined(RANDOM_POOL) |
| 66 | |
| 67 | #ifdef EGD_SOCKET |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 68 | /* Collect entropy from EGD */ |
| 69 | void get_random_bytes(unsigned char *buf, int len) |
| 70 | { |
| 71 | static int egd_socket = -1; |
| 72 | int c; |
| 73 | char egd_message[2] = { 0x02, 0x00 }; |
| 74 | struct sockaddr_un addr; |
| 75 | int addr_len; |
| 76 | |
| 77 | memset(&addr, '\0', sizeof(addr)); |
| 78 | addr.sun_family = AF_UNIX; |
| 79 | |
| 80 | /* FIXME: compile time check? */ |
| 81 | if (sizeof(EGD_SOCKET) > sizeof(addr.sun_path)) |
| 82 | fatal("Random pool path is too long"); |
| 83 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 84 | strlcpy(addr.sun_path, EGD_SOCKET, sizeof(addr.sun_path)); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 85 | |
| 86 | addr_len = offsetof(struct sockaddr_un, sun_path) + sizeof(EGD_SOCKET); |
| 87 | |
| 88 | if (egd_socket == -1) { |
| 89 | egd_socket = socket(AF_UNIX, SOCK_STREAM, 0); |
| 90 | if (egd_socket == -1) |
| 91 | fatal("Couldn't create AF_UNIX socket: %s", strerror(errno)); |
| 92 | if (connect(egd_socket, (struct sockaddr*)&addr, addr_len) == -1) |
| 93 | fatal("Couldn't connect to EGD socket \"%s\": %s", addr.sun_path, strerror(errno)); |
| 94 | } |
| 95 | |
| 96 | if (len > 255) |
| 97 | fatal("Too many bytes to read from EGD"); |
| 98 | |
| 99 | /* Send blocking read request to EGD */ |
| 100 | egd_message[1] = len; |
| 101 | |
| 102 | c = atomicio(write, egd_socket, egd_message, sizeof(egd_message)); |
| 103 | if (c == -1) |
| 104 | fatal("Couldn't write to EGD socket \"%s\": %s", EGD_SOCKET, strerror(errno)); |
| 105 | |
| 106 | c = atomicio(read, egd_socket, buf, len); |
| 107 | if (c <= 0) |
| 108 | fatal("Couldn't read from EGD socket \"%s\": %s", EGD_SOCKET, strerror(errno)); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 109 | } |
| 110 | #else /* !EGD_SOCKET */ |
| 111 | #ifdef RANDOM_POOL |
| 112 | /* Collect entropy from /dev/urandom or pipe */ |
| 113 | void get_random_bytes(unsigned char *buf, int len) |
| 114 | { |
| 115 | static int random_pool = -1; |
| 116 | int c; |
| 117 | |
| 118 | if (random_pool == -1) { |
| 119 | random_pool = open(RANDOM_POOL, O_RDONLY); |
| 120 | if (random_pool == -1) |
| 121 | fatal("Couldn't open random pool \"%s\": %s", RANDOM_POOL, strerror(errno)); |
| 122 | } |
| 123 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 124 | c = atomicio(read, random_pool, buf, len); |
| 125 | if (c <= 0) |
| 126 | fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno)); |
| 127 | } |
| 128 | #endif /* RANDOM_POOL */ |
| 129 | #endif /* EGD_SOCKET */ |
| 130 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 131 | /* |
| 132 | * Seed OpenSSL's random number pool from Kernel random number generator |
| 133 | * or EGD |
| 134 | */ |
| 135 | void |
| 136 | seed_rng(void) |
| 137 | { |
| 138 | char buf[32]; |
| 139 | |
| 140 | debug("Seeding random number generator"); |
| 141 | get_random_bytes(buf, sizeof(buf)); |
| 142 | RAND_add(buf, sizeof(buf), sizeof(buf)); |
| 143 | memset(buf, '\0', sizeof(buf)); |
| 144 | } |
| 145 | |
| 146 | #else /* defined(EGD_SOCKET) || defined(RANDOM_POOL) */ |
| 147 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 148 | /* |
| 149 | * FIXME: proper entropy estimations. All current values are guesses |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 150 | * FIXME: (ATL) do estimates at compile time? |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 151 | * FIXME: More entropy sources |
| 152 | */ |
| 153 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 154 | /* slow command timeouts (all in milliseconds) */ |
| 155 | /* static int entropy_timeout_default = ENTROPY_TIMEOUT_MSEC; */ |
| 156 | static int entropy_timeout_current = ENTROPY_TIMEOUT_MSEC; |
| 157 | |
| 158 | static int prng_seed_loaded = 0; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 159 | static int prng_seed_saved = 0; |
| 160 | static int prng_commands_loaded = 0; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 161 | |
| 162 | typedef struct |
| 163 | { |
| 164 | /* Proportion of data that is entropy */ |
| 165 | double rate; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 166 | /* Counter goes positive if this command times out */ |
| 167 | unsigned int badness; |
| 168 | /* Increases by factor of two each timeout */ |
| 169 | unsigned int sticky_badness; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 170 | /* Path to executable */ |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 171 | char *path; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 172 | /* argv to pass to executable */ |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 173 | char *args[5]; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 174 | /* full command string (debug) */ |
| 175 | char *cmdstring; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 176 | } entropy_source_t; |
| 177 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 178 | double stir_from_system(void); |
| 179 | double stir_from_programs(void); |
| 180 | double stir_gettimeofday(double entropy_estimate); |
| 181 | double stir_clock(double entropy_estimate); |
| 182 | double stir_rusage(int who, double entropy_estimate); |
| 183 | double hash_output_from_command(entropy_source_t *src, char *hash); |
| 184 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 185 | /* this is initialised from a file, by prng_read_commands() */ |
| 186 | entropy_source_t *entropy_sources = NULL; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 187 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 188 | double |
| 189 | stir_from_system(void) |
| 190 | { |
| 191 | double total_entropy_estimate; |
| 192 | long int i; |
| 193 | |
| 194 | total_entropy_estimate = 0; |
| 195 | |
| 196 | i = getpid(); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame^] | 197 | RAND_add(&i, sizeof(i), 0.5); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 198 | total_entropy_estimate += 0.1; |
| 199 | |
| 200 | i = getppid(); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame^] | 201 | RAND_add(&i, sizeof(i), 0.5); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 202 | total_entropy_estimate += 0.1; |
| 203 | |
| 204 | i = getuid(); |
| 205 | RAND_add(&i, sizeof(i), 0.0); |
| 206 | i = getgid(); |
| 207 | RAND_add(&i, sizeof(i), 0.0); |
| 208 | |
| 209 | total_entropy_estimate += stir_gettimeofday(1.0); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame^] | 210 | total_entropy_estimate += stir_clock(0.5); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 211 | total_entropy_estimate += stir_rusage(RUSAGE_SELF, 2.0); |
| 212 | |
| 213 | return(total_entropy_estimate); |
| 214 | } |
| 215 | |
| 216 | double |
| 217 | stir_from_programs(void) |
| 218 | { |
| 219 | int i; |
| 220 | int c; |
| 221 | double entropy_estimate; |
| 222 | double total_entropy_estimate; |
| 223 | char hash[SHA_DIGEST_LENGTH]; |
| 224 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 225 | total_entropy_estimate = 0; |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 226 | for(i = 0; i < NUM_ENTROPY_RUNS; i++) { |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 227 | c = 0; |
| 228 | while (entropy_sources[c].path != NULL) { |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 229 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 230 | if (!entropy_sources[c].badness) { |
| 231 | /* Hash output from command */ |
| 232 | entropy_estimate = hash_output_from_command(&entropy_sources[c], hash); |
| 233 | |
| 234 | /* Scale back entropy estimate according to command's rate */ |
| 235 | entropy_estimate *= entropy_sources[c].rate; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 236 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 237 | /* Upper bound of entropy estimate is SHA_DIGEST_LENGTH */ |
| 238 | if (entropy_estimate > SHA_DIGEST_LENGTH) |
| 239 | entropy_estimate = SHA_DIGEST_LENGTH; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 240 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 241 | /* Scale back estimates for subsequent passes through list */ |
| 242 | entropy_estimate /= SCALE_PER_RUN * (i + 1.0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 243 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 244 | /* Stir it in */ |
| 245 | RAND_add(hash, sizeof(hash), entropy_estimate); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 246 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 247 | #ifdef DEBUG_ENTROPY |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 248 | debug("Got %0.2f bytes of entropy from '%s'", entropy_estimate, |
| 249 | entropy_sources[c].cmdstring); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 250 | #endif |
| 251 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 252 | total_entropy_estimate += entropy_estimate; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 253 | |
| 254 | /* Execution times should be a little unpredictable */ |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 255 | total_entropy_estimate += stir_gettimeofday(0.05); |
| 256 | total_entropy_estimate += stir_clock(0.05); |
| 257 | total_entropy_estimate += stir_rusage(RUSAGE_SELF, 0.1); |
| 258 | total_entropy_estimate += stir_rusage(RUSAGE_CHILDREN, 0.1); |
| 259 | } else { |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 260 | #ifdef DEBUG_ENTROPY |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 261 | debug("Command '%s' disabled (badness %d)", |
| 262 | entropy_sources[c].cmdstring, entropy_sources[c].badness); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 263 | #endif |
| 264 | |
| 265 | if (entropy_sources[c].badness > 0) |
| 266 | entropy_sources[c].badness--; |
| 267 | } |
| 268 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 269 | c++; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | return(total_entropy_estimate); |
| 274 | } |
| 275 | |
| 276 | double |
| 277 | stir_gettimeofday(double entropy_estimate) |
| 278 | { |
| 279 | struct timeval tv; |
| 280 | |
| 281 | if (gettimeofday(&tv, NULL) == -1) |
| 282 | fatal("Couldn't gettimeofday: %s", strerror(errno)); |
| 283 | |
| 284 | RAND_add(&tv, sizeof(tv), entropy_estimate); |
| 285 | |
| 286 | return(entropy_estimate); |
| 287 | } |
| 288 | |
| 289 | double |
| 290 | stir_clock(double entropy_estimate) |
| 291 | { |
| 292 | #ifdef HAVE_CLOCK |
| 293 | clock_t c; |
| 294 | |
| 295 | c = clock(); |
| 296 | RAND_add(&c, sizeof(c), entropy_estimate); |
| 297 | |
| 298 | return(entropy_estimate); |
| 299 | #else /* _HAVE_CLOCK */ |
| 300 | return(0); |
| 301 | #endif /* _HAVE_CLOCK */ |
| 302 | } |
| 303 | |
| 304 | double |
| 305 | stir_rusage(int who, double entropy_estimate) |
| 306 | { |
| 307 | #ifdef HAVE_GETRUSAGE |
| 308 | struct rusage ru; |
| 309 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 310 | if (getrusage(who, &ru) == -1) |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame^] | 311 | return(0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 312 | |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame^] | 313 | RAND_add(&ru, sizeof(ru), entropy_estimate); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 314 | |
| 315 | return(entropy_estimate); |
| 316 | #else /* _HAVE_GETRUSAGE */ |
| 317 | return(0); |
| 318 | #endif /* _HAVE_GETRUSAGE */ |
| 319 | } |
| 320 | |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 321 | |
| 322 | static |
| 323 | int |
| 324 | _get_timeval_msec_difference(struct timeval *t1, struct timeval *t2) { |
| 325 | int secdiff, usecdiff; |
| 326 | |
| 327 | secdiff = t2->tv_sec - t1->tv_sec; |
| 328 | usecdiff = (secdiff*1000000) + (t2->tv_usec - t1->tv_usec); |
| 329 | return (int)(usecdiff / 1000); |
| 330 | } |
| 331 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 332 | double |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 333 | hash_output_from_command(entropy_source_t *src, char *hash) |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 334 | { |
| 335 | static int devnull = -1; |
| 336 | int p[2]; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 337 | fd_set rdset; |
| 338 | int cmd_eof = 0, error_abort = 0; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 339 | struct timeval tv_start, tv_current; |
| 340 | int msec_elapsed = 0; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 341 | pid_t pid; |
| 342 | int status; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 343 | char buf[16384]; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 344 | int bytes_read; |
| 345 | int total_bytes_read; |
| 346 | SHA_CTX sha; |
| 347 | |
| 348 | if (devnull == -1) { |
| 349 | devnull = open("/dev/null", O_RDWR); |
| 350 | if (devnull == -1) |
| 351 | fatal("Couldn't open /dev/null: %s", strerror(errno)); |
| 352 | } |
| 353 | |
| 354 | if (pipe(p) == -1) |
| 355 | fatal("Couldn't open pipe: %s", strerror(errno)); |
| 356 | |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 357 | (void)gettimeofday(&tv_start, NULL); /* record start time */ |
| 358 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 359 | switch (pid = fork()) { |
| 360 | case -1: /* Error */ |
| 361 | close(p[0]); |
| 362 | close(p[1]); |
| 363 | fatal("Couldn't fork: %s", strerror(errno)); |
| 364 | /* NOTREACHED */ |
| 365 | case 0: /* Child */ |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 366 | dup2(devnull, STDIN_FILENO); |
| 367 | dup2(p[1], STDOUT_FILENO); |
| 368 | dup2(p[1], STDERR_FILENO); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 369 | close(p[0]); |
| 370 | close(p[1]); |
| 371 | close(devnull); |
| 372 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 373 | execv(src->path, (char**)(src->args)); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 374 | debug("(child) Couldn't exec '%s': %s", src->cmdstring, |
| 375 | strerror(errno)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 376 | src->badness = src->sticky_badness = 128; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 377 | _exit(-1); |
| 378 | default: /* Parent */ |
| 379 | break; |
| 380 | } |
| 381 | |
| 382 | RAND_add(&pid, sizeof(&pid), 0.0); |
| 383 | |
| 384 | close(p[1]); |
| 385 | |
| 386 | /* Hash output from child */ |
| 387 | SHA1_Init(&sha); |
| 388 | total_bytes_read = 0; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 389 | |
| 390 | while (!error_abort && !cmd_eof) { |
| 391 | int ret; |
| 392 | struct timeval tv; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 393 | int msec_remaining; |
| 394 | |
| 395 | (void) gettimeofday(&tv_current, 0); |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 396 | msec_elapsed = _get_timeval_msec_difference(&tv_start, &tv_current); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 397 | if (msec_elapsed >= entropy_timeout_current) { |
| 398 | error_abort=1; |
| 399 | continue; |
| 400 | } |
| 401 | msec_remaining = entropy_timeout_current - msec_elapsed; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 402 | |
| 403 | FD_ZERO(&rdset); |
| 404 | FD_SET(p[0], &rdset); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 405 | tv.tv_sec = msec_remaining / 1000; |
| 406 | tv.tv_usec = (msec_remaining % 1000) * 1000; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 407 | |
| 408 | ret = select(p[0]+1, &rdset, NULL, NULL, &tv); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 409 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 410 | switch (ret) { |
| 411 | case 0: |
| 412 | /* timer expired */ |
| 413 | error_abort = 1; |
| 414 | break; |
| 415 | |
| 416 | case 1: |
| 417 | /* command input */ |
| 418 | bytes_read = read(p[0], buf, sizeof(buf)); |
| 419 | if (bytes_read == -1) { |
| 420 | error_abort = 1; |
| 421 | break; |
| 422 | } |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 423 | if (bytes_read) { |
| 424 | SHA1_Update(&sha, buf, bytes_read); |
| 425 | total_bytes_read += bytes_read; |
| 426 | RAND_add(&bytes_read, sizeof(&bytes_read), 0.0); |
| 427 | } else |
| 428 | cmd_eof = 1; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 429 | |
| 430 | break; |
| 431 | |
| 432 | case -1: |
| 433 | default: |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 434 | debug("Command '%s': select() failed: %s", src->cmdstring, |
| 435 | strerror(errno)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 436 | error_abort = 1; |
| 437 | break; |
| 438 | } /* switch ret */ |
| 439 | |
| 440 | RAND_add(&tv, sizeof(&tv), 0.0); |
| 441 | } /* while !error_abort && !cmd_eof */ |
| 442 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 443 | SHA1_Final(hash, &sha); |
| 444 | |
| 445 | close(p[0]); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 446 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 447 | #ifdef DEBUG_ENTROPY |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 448 | debug("Time elapsed: %d msec", msec_elapsed); |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 449 | #endif |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 450 | |
| 451 | if (waitpid(pid, &status, 0) == -1) { |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 452 | debug("Couldn't wait for child '%s' completion: %s", src->cmdstring, |
| 453 | strerror(errno)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 454 | return(0.0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | RAND_add(&status, sizeof(&status), 0.0); |
| 458 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 459 | if (error_abort) { |
| 460 | /* closing p[0] on timeout causes the entropy command to |
| 461 | * SIGPIPE. Take whatever output we got, and mark this command |
| 462 | * as slow */ |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 463 | debug("Command '%s' timed out", src->cmdstring); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 464 | src->sticky_badness *= 2; |
| 465 | src->badness = src->sticky_badness; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 466 | return(total_bytes_read); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | if (WIFEXITED(status)) { |
| 470 | if (WEXITSTATUS(status)==0) { |
| 471 | return(total_bytes_read); |
| 472 | } else { |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 473 | debug("Command '%s' exit status was %d", src->cmdstring, |
| 474 | WEXITSTATUS(status)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 475 | src->badness = src->sticky_badness = 128; |
| 476 | return (0.0); |
| 477 | } |
| 478 | } else if (WIFSIGNALED(status)) { |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 479 | debug("Command '%s' returned on uncaught signal %d !", src->cmdstring, |
| 480 | status); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 481 | src->badness = src->sticky_badness = 128; |
| 482 | return(0.0); |
| 483 | } else |
| 484 | return(0.0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 485 | } |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 486 | |
| 487 | /* |
| 488 | * prng seedfile functions |
| 489 | */ |
| 490 | int |
| 491 | prng_check_seedfile(char *filename) { |
| 492 | |
| 493 | struct stat st; |
| 494 | |
| 495 | /* FIXME raceable: eg replace seed between this stat and subsequent open */ |
| 496 | /* Not such a problem because we don't trust the seed file anyway */ |
| 497 | if (lstat(filename, &st) == -1) { |
| 498 | /* Fail on hard errors */ |
| 499 | if (errno != ENOENT) |
| 500 | fatal("Couldn't stat random seed file \"%s\": %s", filename, |
| 501 | strerror(errno)); |
| 502 | |
| 503 | return(0); |
| 504 | } |
| 505 | |
| 506 | /* regular file? */ |
| 507 | if (!S_ISREG(st.st_mode)) |
| 508 | fatal("PRNG seedfile %.100s is not a regular file", filename); |
| 509 | |
| 510 | /* mode 0600, owned by root or the current user? */ |
Damien Miller | accfeb3 | 2000-05-11 19:10:58 +1000 | [diff] [blame] | 511 | if (((st.st_mode & 0177) != 0) || !(st.st_uid == getuid())) |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 512 | fatal("PRNG seedfile %.100s must be mode 0600, owned by uid %d", |
| 513 | filename, getuid()); |
| 514 | |
| 515 | return(1); |
| 516 | } |
| 517 | |
| 518 | void |
| 519 | prng_write_seedfile(void) { |
| 520 | int fd; |
| 521 | char seed[1024]; |
| 522 | char filename[1024]; |
| 523 | struct passwd *pw; |
| 524 | |
| 525 | /* Don't bother if we have already saved a seed */ |
| 526 | if (prng_seed_saved) |
| 527 | return; |
| 528 | |
Damien Miller | fc0b11b | 2000-05-02 00:03:55 +1000 | [diff] [blame] | 529 | prng_seed_saved = 1; |
| 530 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 531 | pw = getpwuid(getuid()); |
| 532 | if (pw == NULL) |
| 533 | fatal("Couldn't get password entry for current user (%i): %s", |
| 534 | getuid(), strerror(errno)); |
| 535 | |
| 536 | /* Try to ensure that the parent directory is there */ |
| 537 | snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir, |
| 538 | SSH_USER_DIR); |
| 539 | mkdir(filename, 0700); |
| 540 | |
| 541 | snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir, |
| 542 | SSH_PRNG_SEED_FILE); |
| 543 | |
| 544 | debug("writing PRNG seed to file %.100s", filename); |
| 545 | |
| 546 | RAND_bytes(seed, sizeof(seed)); |
| 547 | |
| 548 | /* Don't care if the seed doesn't exist */ |
| 549 | prng_check_seedfile(filename); |
| 550 | |
| 551 | if ((fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0600)) == -1) |
| 552 | fatal("couldn't access PRNG seedfile %.100s (%.100s)", filename, |
| 553 | strerror(errno)); |
| 554 | |
| 555 | if (atomicio(write, fd, &seed, sizeof(seed)) != sizeof(seed)) |
| 556 | fatal("problem writing PRNG seedfile %.100s (%.100s)", filename, |
| 557 | strerror(errno)); |
| 558 | |
| 559 | close(fd); |
| 560 | } |
| 561 | |
| 562 | void |
| 563 | prng_read_seedfile(void) { |
| 564 | int fd; |
| 565 | char seed[1024]; |
| 566 | char filename[1024]; |
| 567 | struct passwd *pw; |
| 568 | |
| 569 | pw = getpwuid(getuid()); |
| 570 | if (pw == NULL) |
| 571 | fatal("Couldn't get password entry for current user (%i): %s", |
| 572 | getuid(), strerror(errno)); |
| 573 | |
| 574 | snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir, |
| 575 | SSH_PRNG_SEED_FILE); |
| 576 | |
| 577 | debug("loading PRNG seed from file %.100s", filename); |
| 578 | |
| 579 | if (!prng_check_seedfile(filename)) { |
| 580 | verbose("Random seed file not found, creating new"); |
| 581 | prng_write_seedfile(); |
| 582 | |
| 583 | /* Reseed immediatly */ |
| 584 | (void)stir_from_system(); |
| 585 | (void)stir_from_programs(); |
| 586 | return; |
| 587 | } |
| 588 | |
| 589 | /* open the file and read in the seed */ |
| 590 | fd = open(filename, O_RDONLY); |
| 591 | if (fd == -1) |
| 592 | fatal("could not open PRNG seedfile %.100s (%.100s)", filename, |
| 593 | strerror(errno)); |
| 594 | |
| 595 | if (atomicio(read, fd, &seed, sizeof(seed)) != sizeof(seed)) { |
| 596 | verbose("invalid or short read from PRNG seedfile %.100s - ignoring", |
| 597 | filename); |
| 598 | memset(seed, '\0', sizeof(seed)); |
| 599 | } |
| 600 | close(fd); |
| 601 | |
| 602 | /* stir in the seed, with estimated entropy zero */ |
| 603 | RAND_add(&seed, sizeof(seed), 0.0); |
| 604 | } |
| 605 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 606 | |
| 607 | /* |
| 608 | * entropy command initialisation functions |
| 609 | */ |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 610 | int |
| 611 | prng_read_commands(char *cmdfilename) |
| 612 | { |
| 613 | FILE *f; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 614 | char *cp; |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 615 | char line[1024]; |
| 616 | char cmd[1024]; |
| 617 | char path[256]; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 618 | int linenum; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 619 | int num_cmds = 64; |
| 620 | int cur_cmd = 0; |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 621 | double est; |
| 622 | entropy_source_t *entcmd; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 623 | |
| 624 | f = fopen(cmdfilename, "r"); |
| 625 | if (!f) { |
| 626 | fatal("couldn't read entropy commands file %.100s: %.100s", |
| 627 | cmdfilename, strerror(errno)); |
| 628 | } |
| 629 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 630 | entcmd = (entropy_source_t *)xmalloc(num_cmds * sizeof(entropy_source_t)); |
| 631 | memset(entcmd, '\0', num_cmds * sizeof(entropy_source_t)); |
| 632 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 633 | /* Read in file */ |
| 634 | linenum = 0; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 635 | while (fgets(line, sizeof(line), f)) { |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 636 | int arg; |
| 637 | char *argv; |
| 638 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 639 | linenum++; |
| 640 | |
| 641 | /* skip leading whitespace, test for blank line or comment */ |
| 642 | cp = line + strspn(line, WHITESPACE); |
| 643 | if ((*cp == 0) || (*cp == '#')) |
| 644 | continue; /* done with this line */ |
| 645 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 646 | /* First non-whitespace char should be double quote delimiting */ |
| 647 | /* commandline */ |
| 648 | if (*cp != '"') { |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 649 | error("bad entropy command, %.100s line %d", cmdfilename, |
| 650 | linenum); |
| 651 | continue; |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | /* first token, command args (incl. argv[0]) in double quotes */ |
| 655 | cp = strtok(cp, "\""); |
| 656 | if (cp == NULL) { |
| 657 | error("missing or bad command string, %.100s line %d -- ignored", |
| 658 | cmdfilename, linenum); |
| 659 | continue; |
| 660 | } |
| 661 | strlcpy(cmd, cp, sizeof(cmd)); |
| 662 | |
| 663 | /* second token, full command path */ |
| 664 | if ((cp = strtok(NULL, WHITESPACE)) == NULL) { |
| 665 | error("missing command path, %.100s line %d -- ignored", |
| 666 | cmdfilename, linenum); |
| 667 | continue; |
| 668 | } |
| 669 | |
| 670 | /* did configure mark this as dead? */ |
| 671 | if (strncmp("undef", cp, 5) == 0) |
| 672 | continue; |
| 673 | |
| 674 | strlcpy(path, cp, sizeof(path)); |
| 675 | |
| 676 | /* third token, entropy rate estimate for this command */ |
| 677 | if ((cp = strtok(NULL, WHITESPACE)) == NULL) { |
| 678 | error("missing entropy estimate, %.100s line %d -- ignored", |
| 679 | cmdfilename, linenum); |
| 680 | continue; |
| 681 | } |
| 682 | est = strtod(cp, &argv); |
| 683 | |
| 684 | /* end of line */ |
| 685 | if ((cp = strtok(NULL, WHITESPACE)) != NULL) { |
| 686 | error("garbage at end of line %d in %.100s -- ignored", linenum, |
| 687 | cmdfilename); |
| 688 | continue; |
| 689 | } |
| 690 | |
| 691 | /* save the command for debug messages */ |
| 692 | entcmd[cur_cmd].cmdstring = xstrdup(cmd); |
| 693 | |
| 694 | /* split the command args */ |
| 695 | cp = strtok(cmd, WHITESPACE); |
| 696 | arg = 0; |
| 697 | argv = NULL; |
| 698 | do { |
| 699 | char *s = (char*)xmalloc(strlen(cp) + 1); |
| 700 | strncpy(s, cp, strlen(cp) + 1); |
| 701 | entcmd[cur_cmd].args[arg] = s; |
| 702 | arg++; |
| 703 | } while ((arg < 5) && (cp = strtok(NULL, WHITESPACE))); |
| 704 | |
| 705 | if (strtok(NULL, WHITESPACE)) |
| 706 | error("ignored extra command elements (max 5), %.100s line %d", |
| 707 | cmdfilename, linenum); |
| 708 | |
| 709 | /* Copy the command path and rate estimate */ |
| 710 | entcmd[cur_cmd].path = xstrdup(path); |
| 711 | entcmd[cur_cmd].rate = est; |
| 712 | |
| 713 | /* Initialise other values */ |
| 714 | entcmd[cur_cmd].sticky_badness = 1; |
| 715 | |
| 716 | cur_cmd++; |
| 717 | |
| 718 | /* If we've filled the array, reallocate it twice the size */ |
| 719 | /* Do this now because even if this we're on the last command, |
| 720 | we need another slot to mark the last entry */ |
| 721 | if (cur_cmd == num_cmds) { |
| 722 | num_cmds *= 2; |
| 723 | entcmd = xrealloc(entcmd, num_cmds * sizeof(entropy_source_t)); |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 724 | } |
| 725 | } |
| 726 | |
| 727 | /* zero the last entry */ |
| 728 | memset(&entcmd[cur_cmd], '\0', sizeof(entropy_source_t)); |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 729 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 730 | /* trim to size */ |
| 731 | entropy_sources = xrealloc(entcmd, (cur_cmd+1) * sizeof(entropy_source_t)); |
| 732 | |
| 733 | debug("loaded %d entropy commands from %.100s", cur_cmd, cmdfilename); |
| 734 | |
| 735 | return (cur_cmd >= MIN_ENTROPY_SOURCES); |
| 736 | } |
| 737 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 738 | /* |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 739 | * Write a keyfile at exit |
| 740 | */ |
| 741 | void |
| 742 | prng_seed_cleanup(void *junk) |
| 743 | { |
| 744 | prng_write_seedfile(); |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * Conditionally Seed OpenSSL's random number pool from |
| 749 | * syscalls and program output |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 750 | */ |
| 751 | void |
| 752 | seed_rng(void) |
| 753 | { |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 754 | void *old_sigchld_handler; |
| 755 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 756 | if (!prng_commands_loaded) { |
| 757 | if (!prng_read_commands(SSH_PRNG_COMMAND_FILE)) |
| 758 | fatal("PRNG initialisation failed -- exiting."); |
| 759 | prng_commands_loaded = 1; |
| 760 | } |
| 761 | |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 762 | /* Make sure some other sigchld handler doesn't reap our entropy */ |
| 763 | /* commands */ |
| 764 | old_sigchld_handler = signal(SIGCHLD, SIG_DFL); |
| 765 | |
Damien Miller | 74a333b | 2000-04-04 15:04:09 +1000 | [diff] [blame] | 766 | debug("Seeding random number generator."); |
| 767 | debug("OpenSSL random status is now %i\n", RAND_status()); |
| 768 | debug("%i bytes from system calls", (int)stir_from_system()); |
| 769 | debug("%i bytes from programs", (int)stir_from_programs()); |
| 770 | debug("OpenSSL random status is now %i\n", RAND_status()); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 771 | |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 772 | signal(SIGCHLD, old_sigchld_handler); |
| 773 | |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 774 | if (!RAND_status()) |
| 775 | fatal("Couldn't initialise builtin random number generator -- exiting."); |
| 776 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 777 | if (!prng_seed_loaded) |
| 778 | { |
| 779 | prng_seed_loaded = 1; |
| 780 | prng_seed_saved = 0; |
| 781 | prng_read_seedfile(); |
| 782 | fatal_add_cleanup(prng_seed_cleanup, NULL); |
| 783 | atexit(prng_write_seedfile); |
| 784 | } |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 785 | } |
| 786 | #endif /* defined(EGD_SOCKET) || defined(RANDOM_POOL) */ |