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. |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 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 | |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 27 | #include <openssl/rand.h> |
| 28 | #include <openssl/sha.h> |
Damien Miller | 767c7fc | 2001-02-27 09:20:57 +1100 | [diff] [blame] | 29 | #include <openssl/crypto.h> |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 30 | |
Damien Miller | ecbb26d | 2000-07-15 14:59:14 +1000 | [diff] [blame] | 31 | /* SunOS 4.4.4 needs this */ |
| 32 | #ifdef HAVE_FLOATINGPOINT_H |
| 33 | # include <floatingpoint.h> |
| 34 | #endif /* HAVE_FLOATINGPOINT_H */ |
| 35 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 36 | #include "ssh.h" |
Damien Miller | a1072a8 | 2001-02-18 15:28:11 +1100 | [diff] [blame] | 37 | #include "misc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 38 | #include "xmalloc.h" |
| 39 | #include "atomicio.h" |
Ben Lindstrom | cb57733 | 2001-01-22 21:06:19 +0000 | [diff] [blame] | 40 | #include "pathnames.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 41 | #include "log.h" |
| 42 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 43 | RCSID("$Id: entropy.c,v 1.35 2001/03/03 13:29:21 djm Exp $"); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 44 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 45 | #ifndef offsetof |
| 46 | # define offsetof(type, member) ((size_t) &((type *)0)->member) |
| 47 | #endif |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 48 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 49 | /* Number of times to pass through command list gathering entropy */ |
| 50 | #define NUM_ENTROPY_RUNS 1 |
| 51 | |
| 52 | /* Scale entropy estimates back by this amount on subsequent runs */ |
| 53 | #define SCALE_PER_RUN 10.0 |
| 54 | |
| 55 | /* Minimum number of commands to be considered valid */ |
| 56 | #define MIN_ENTROPY_SOURCES 16 |
| 57 | |
| 58 | #define WHITESPACE " \t\n" |
| 59 | |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 60 | #ifndef RUSAGE_SELF |
| 61 | # define RUSAGE_SELF 0 |
| 62 | #endif |
| 63 | #ifndef RUSAGE_CHILDREN |
| 64 | # define RUSAGE_CHILDREN 0 |
| 65 | #endif |
| 66 | |
Damien Miller | fbd884a | 2001-02-27 08:39:07 +1100 | [diff] [blame] | 67 | #if defined(_POSIX_SAVED_IDS) && !defined(BROKEN_SAVED_UIDS) |
| 68 | # define SAVED_IDS_WORK_WITH_SETEUID |
| 69 | #endif |
| 70 | |
Damien Miller | 767c7fc | 2001-02-27 09:20:57 +1100 | [diff] [blame] | 71 | void check_openssl_version(void) |
| 72 | { |
| 73 | if (SSLeay() != OPENSSL_VERSION_NUMBER) |
Damien Miller | 3456d32 | 2001-02-27 11:00:52 +1100 | [diff] [blame] | 74 | fatal("OpenSSL version mismatch. Built against %lx, you " |
| 75 | "have %lx", OPENSSL_VERSION_NUMBER, SSLeay()); |
Damien Miller | 767c7fc | 2001-02-27 09:20:57 +1100 | [diff] [blame] | 76 | } |
| 77 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 78 | #if defined(PRNGD_SOCKET) || defined(PRNGD_PORT) |
| 79 | # define USE_PRNGD |
| 80 | #endif |
Damien Miller | 767c7fc | 2001-02-27 09:20:57 +1100 | [diff] [blame] | 81 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 82 | #if defined(USE_PRNGD) || defined(RANDOM_POOL) |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 83 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 84 | #ifdef USE_PRNGD |
| 85 | /* Collect entropy from PRNGD/EGD */ |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 86 | int get_random_bytes(unsigned char *buf, int len) |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 87 | { |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 88 | int fd; |
| 89 | char msg[2]; |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 90 | #ifdef PRNGD_PORT |
| 91 | struct sockaddr_in addr; |
| 92 | #else |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 93 | struct sockaddr_un addr; |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 94 | #endif |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 95 | int addr_len, rval, errors; |
Damien Miller | a1072a8 | 2001-02-18 15:28:11 +1100 | [diff] [blame] | 96 | mysig_t old_sigpipe; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 97 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 98 | memset(&addr, '\0', sizeof(addr)); |
| 99 | |
| 100 | #ifdef PRNGD_PORT |
| 101 | addr.sin_family = AF_INET; |
| 102 | addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 103 | addr.sin_port = htons(PRNGD_PORT); |
| 104 | addr_len = sizeof(struct sockaddr_in); |
| 105 | #else /* use IP socket PRNGD_SOCKET instead */ |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 106 | /* Sanity checks */ |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 107 | if (sizeof(PRNGD_SOCKET) > sizeof(addr.sun_path)) |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 108 | fatal("Random pool path is too long"); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 109 | if (len > 255) |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 110 | fatal("Too many bytes to read from PRNGD"); |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 111 | |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 112 | addr.sun_family = AF_UNIX; |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 113 | strlcpy(addr.sun_path, PRNGD_SOCKET, sizeof(addr.sun_path)); |
| 114 | addr_len = offsetof(struct sockaddr_un, sun_path) + |
| 115 | sizeof(PRNGD_SOCKET); |
| 116 | #endif |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 117 | |
Damien Miller | a1072a8 | 2001-02-18 15:28:11 +1100 | [diff] [blame] | 118 | old_sigpipe = mysignal(SIGPIPE, SIG_IGN); |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 119 | |
| 120 | errors = rval = 0; |
| 121 | reopen: |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 122 | #ifdef PRNGD_PORT |
| 123 | fd = socket(addr.sin_family, SOCK_STREAM, 0); |
| 124 | if (fd == -1) { |
| 125 | error("Couldn't create AF_INET socket: %s", strerror(errno)); |
| 126 | goto done; |
| 127 | } |
| 128 | #else |
| 129 | fd = socket(addr.sun_family, SOCK_STREAM, 0); |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 130 | if (fd == -1) { |
| 131 | error("Couldn't create AF_UNIX socket: %s", strerror(errno)); |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 132 | goto done; |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 133 | } |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 134 | #endif |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 135 | |
| 136 | if (connect(fd, (struct sockaddr*)&addr, addr_len) == -1) { |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 137 | #ifdef PRNGD_PORT |
| 138 | error("Couldn't connect to PRNGD port %d: %s", |
| 139 | PRNGD_PORT, strerror(errno)); |
| 140 | #else |
| 141 | error("Couldn't connect to PRNGD socket \"%s\": %s", |
| 142 | addr.sun_path, strerror(errno)); |
| 143 | #endif |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 144 | goto done; |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 145 | } |
| 146 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 147 | /* Send blocking read request to PRNGD */ |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 148 | msg[0] = 0x02; |
| 149 | msg[1] = len; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 150 | |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 151 | if (atomicio(write, fd, msg, sizeof(msg)) != sizeof(msg)) { |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 152 | if (errno == EPIPE && errors < 10) { |
| 153 | close(fd); |
| 154 | errors++; |
| 155 | goto reopen; |
| 156 | } |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 157 | error("Couldn't write to PRNGD socket: %s", |
| 158 | strerror(errno)); |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 159 | goto done; |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 160 | } |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 161 | |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 162 | if (atomicio(read, fd, buf, len) != len) { |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 163 | if (errno == EPIPE && errors < 10) { |
| 164 | close(fd); |
| 165 | errors++; |
| 166 | goto reopen; |
| 167 | } |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 168 | error("Couldn't read from PRNGD socket: %s", |
| 169 | strerror(errno)); |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 170 | goto done; |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 171 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 172 | |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 173 | rval = 1; |
| 174 | done: |
Kevin Steves | 4679f5b | 2001-02-18 11:34:32 +0000 | [diff] [blame] | 175 | mysignal(SIGPIPE, old_sigpipe); |
Damien Miller | b3ffc5f | 2001-02-18 12:44:29 +1100 | [diff] [blame] | 176 | if (fd != -1) |
| 177 | close(fd); |
| 178 | return(rval); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 179 | } |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 180 | #else /* !USE_PRNGD */ |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 181 | #ifdef RANDOM_POOL |
| 182 | /* Collect entropy from /dev/urandom or pipe */ |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 183 | int get_random_bytes(unsigned char *buf, int len) |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 184 | { |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 185 | int random_pool; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 186 | |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 187 | random_pool = open(RANDOM_POOL, O_RDONLY); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 188 | if (random_pool == -1) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 189 | error("Couldn't open random pool \"%s\": %s", |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 190 | RANDOM_POOL, strerror(errno)); |
| 191 | return(0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 192 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 193 | |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 194 | if (atomicio(read, random_pool, buf, len) != len) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 195 | error("Couldn't read from random pool \"%s\": %s", |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 196 | RANDOM_POOL, strerror(errno)); |
| 197 | close(random_pool); |
| 198 | return(0); |
| 199 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 200 | |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 201 | close(random_pool); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 202 | |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 203 | return(1); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 204 | } |
| 205 | #endif /* RANDOM_POOL */ |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 206 | #endif /* USE_PRNGD */ |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 207 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 208 | /* |
| 209 | * Seed OpenSSL's random number pool from Kernel random number generator |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 210 | * or PRNGD/EGD |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 211 | */ |
| 212 | void |
| 213 | seed_rng(void) |
| 214 | { |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 215 | unsigned char buf[32]; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 216 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 217 | debug("Seeding random number generator"); |
Damien Miller | 6468125 | 2000-06-26 13:01:33 +1000 | [diff] [blame] | 218 | |
Damien Miller | 0800647 | 2000-06-26 13:55:31 +1000 | [diff] [blame] | 219 | if (!get_random_bytes(buf, sizeof(buf))) { |
| 220 | if (!RAND_status()) |
| 221 | fatal("Entropy collection failed and entropy exhausted"); |
| 222 | } else { |
| 223 | RAND_add(buf, sizeof(buf), sizeof(buf)); |
| 224 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 225 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 226 | memset(buf, '\0', sizeof(buf)); |
| 227 | } |
| 228 | |
Damien Miller | 767c7fc | 2001-02-27 09:20:57 +1100 | [diff] [blame] | 229 | void init_rng(void) |
| 230 | { |
| 231 | check_openssl_version(); |
| 232 | } |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 233 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 234 | #else /* defined(USE_PRNGD) || defined(RANDOM_POOL) */ |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 235 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 236 | /* |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 237 | * FIXME: proper entropy estimations. All current values are guesses |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 238 | * FIXME: (ATL) do estimates at compile time? |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 239 | * FIXME: More entropy sources |
| 240 | */ |
| 241 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 242 | /* slow command timeouts (all in milliseconds) */ |
| 243 | /* static int entropy_timeout_default = ENTROPY_TIMEOUT_MSEC; */ |
| 244 | static int entropy_timeout_current = ENTROPY_TIMEOUT_MSEC; |
| 245 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 246 | static int prng_seed_saved = 0; |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 247 | static int prng_initialised = 0; |
| 248 | uid_t original_uid; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 249 | |
| 250 | typedef struct |
| 251 | { |
| 252 | /* Proportion of data that is entropy */ |
| 253 | double rate; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 254 | /* Counter goes positive if this command times out */ |
| 255 | unsigned int badness; |
| 256 | /* Increases by factor of two each timeout */ |
| 257 | unsigned int sticky_badness; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 258 | /* Path to executable */ |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 259 | char *path; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 260 | /* argv to pass to executable */ |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 261 | char *args[5]; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 262 | /* full command string (debug) */ |
| 263 | char *cmdstring; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 264 | } entropy_source_t; |
| 265 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 266 | double stir_from_system(void); |
| 267 | double stir_from_programs(void); |
| 268 | double stir_gettimeofday(double entropy_estimate); |
| 269 | double stir_clock(double entropy_estimate); |
| 270 | double stir_rusage(int who, double entropy_estimate); |
| 271 | double hash_output_from_command(entropy_source_t *src, char *hash); |
| 272 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 273 | /* this is initialised from a file, by prng_read_commands() */ |
| 274 | entropy_source_t *entropy_sources = NULL; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 275 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 276 | double |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 277 | stir_from_system(void) |
| 278 | { |
| 279 | double total_entropy_estimate; |
| 280 | long int i; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 281 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 282 | total_entropy_estimate = 0; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 283 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 284 | i = getpid(); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 285 | RAND_add(&i, sizeof(i), 0.5); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 286 | total_entropy_estimate += 0.1; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 287 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 288 | i = getppid(); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 289 | RAND_add(&i, sizeof(i), 0.5); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 290 | total_entropy_estimate += 0.1; |
| 291 | |
| 292 | i = getuid(); |
| 293 | RAND_add(&i, sizeof(i), 0.0); |
| 294 | i = getgid(); |
| 295 | RAND_add(&i, sizeof(i), 0.0); |
| 296 | |
| 297 | total_entropy_estimate += stir_gettimeofday(1.0); |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 298 | total_entropy_estimate += stir_clock(0.5); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 299 | total_entropy_estimate += stir_rusage(RUSAGE_SELF, 2.0); |
| 300 | |
| 301 | return(total_entropy_estimate); |
| 302 | } |
| 303 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 304 | double |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 305 | stir_from_programs(void) |
| 306 | { |
| 307 | int i; |
| 308 | int c; |
| 309 | double entropy_estimate; |
| 310 | double total_entropy_estimate; |
| 311 | char hash[SHA_DIGEST_LENGTH]; |
| 312 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 313 | total_entropy_estimate = 0; |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 314 | for(i = 0; i < NUM_ENTROPY_RUNS; i++) { |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 315 | c = 0; |
| 316 | while (entropy_sources[c].path != NULL) { |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 317 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 318 | if (!entropy_sources[c].badness) { |
| 319 | /* Hash output from command */ |
| 320 | entropy_estimate = hash_output_from_command(&entropy_sources[c], hash); |
| 321 | |
| 322 | /* Scale back entropy estimate according to command's rate */ |
| 323 | entropy_estimate *= entropy_sources[c].rate; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 324 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 325 | /* Upper bound of entropy estimate is SHA_DIGEST_LENGTH */ |
| 326 | if (entropy_estimate > SHA_DIGEST_LENGTH) |
| 327 | entropy_estimate = SHA_DIGEST_LENGTH; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 328 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 329 | /* Scale back estimates for subsequent passes through list */ |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 330 | entropy_estimate /= SCALE_PER_RUN * (i + 1.0); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 331 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 332 | /* Stir it in */ |
| 333 | RAND_add(hash, sizeof(hash), entropy_estimate); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 334 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 335 | debug3("Got %0.2f bytes of entropy from '%s'", entropy_estimate, |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 336 | entropy_sources[c].cmdstring); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 337 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 338 | total_entropy_estimate += entropy_estimate; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 339 | |
| 340 | /* Execution times should be a little unpredictable */ |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 341 | total_entropy_estimate += stir_gettimeofday(0.05); |
| 342 | total_entropy_estimate += stir_clock(0.05); |
| 343 | total_entropy_estimate += stir_rusage(RUSAGE_SELF, 0.1); |
| 344 | total_entropy_estimate += stir_rusage(RUSAGE_CHILDREN, 0.1); |
| 345 | } else { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 346 | debug2("Command '%s' disabled (badness %d)", |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 347 | entropy_sources[c].cmdstring, entropy_sources[c].badness); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 348 | |
| 349 | if (entropy_sources[c].badness > 0) |
| 350 | entropy_sources[c].badness--; |
| 351 | } |
| 352 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 353 | c++; |
| 354 | } |
| 355 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 356 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 357 | return(total_entropy_estimate); |
| 358 | } |
| 359 | |
| 360 | double |
| 361 | stir_gettimeofday(double entropy_estimate) |
| 362 | { |
| 363 | struct timeval tv; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 364 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 365 | if (gettimeofday(&tv, NULL) == -1) |
| 366 | fatal("Couldn't gettimeofday: %s", strerror(errno)); |
| 367 | |
| 368 | RAND_add(&tv, sizeof(tv), entropy_estimate); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 369 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 370 | return(entropy_estimate); |
| 371 | } |
| 372 | |
| 373 | double |
| 374 | stir_clock(double entropy_estimate) |
| 375 | { |
| 376 | #ifdef HAVE_CLOCK |
| 377 | clock_t c; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 378 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 379 | c = clock(); |
| 380 | RAND_add(&c, sizeof(c), entropy_estimate); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 381 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 382 | return(entropy_estimate); |
| 383 | #else /* _HAVE_CLOCK */ |
| 384 | return(0); |
| 385 | #endif /* _HAVE_CLOCK */ |
| 386 | } |
| 387 | |
| 388 | double |
| 389 | stir_rusage(int who, double entropy_estimate) |
| 390 | { |
| 391 | #ifdef HAVE_GETRUSAGE |
| 392 | struct rusage ru; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 393 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 394 | if (getrusage(who, &ru) == -1) |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 395 | return(0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 396 | |
Damien Miller | 7b22d65 | 2000-06-18 14:07:04 +1000 | [diff] [blame] | 397 | RAND_add(&ru, sizeof(ru), entropy_estimate); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 398 | |
| 399 | return(entropy_estimate); |
| 400 | #else /* _HAVE_GETRUSAGE */ |
| 401 | return(0); |
| 402 | #endif /* _HAVE_GETRUSAGE */ |
| 403 | } |
| 404 | |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 405 | |
| 406 | static |
| 407 | int |
| 408 | _get_timeval_msec_difference(struct timeval *t1, struct timeval *t2) { |
| 409 | int secdiff, usecdiff; |
| 410 | |
| 411 | secdiff = t2->tv_sec - t1->tv_sec; |
| 412 | usecdiff = (secdiff*1000000) + (t2->tv_usec - t1->tv_usec); |
| 413 | return (int)(usecdiff / 1000); |
| 414 | } |
| 415 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 416 | double |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 417 | hash_output_from_command(entropy_source_t *src, char *hash) |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 418 | { |
| 419 | static int devnull = -1; |
| 420 | int p[2]; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 421 | fd_set rdset; |
| 422 | int cmd_eof = 0, error_abort = 0; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 423 | struct timeval tv_start, tv_current; |
| 424 | int msec_elapsed = 0; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 425 | pid_t pid; |
| 426 | int status; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 427 | char buf[16384]; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 428 | int bytes_read; |
| 429 | int total_bytes_read; |
| 430 | SHA_CTX sha; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 431 | |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 432 | debug3("Reading output from \'%s\'", src->cmdstring); |
| 433 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 434 | if (devnull == -1) { |
| 435 | devnull = open("/dev/null", O_RDWR); |
| 436 | if (devnull == -1) |
| 437 | fatal("Couldn't open /dev/null: %s", strerror(errno)); |
| 438 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 439 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 440 | if (pipe(p) == -1) |
| 441 | fatal("Couldn't open pipe: %s", strerror(errno)); |
| 442 | |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 443 | (void)gettimeofday(&tv_start, NULL); /* record start time */ |
| 444 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 445 | switch (pid = fork()) { |
| 446 | case -1: /* Error */ |
| 447 | close(p[0]); |
| 448 | close(p[1]); |
| 449 | fatal("Couldn't fork: %s", strerror(errno)); |
| 450 | /* NOTREACHED */ |
| 451 | case 0: /* Child */ |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 452 | dup2(devnull, STDIN_FILENO); |
| 453 | dup2(p[1], STDOUT_FILENO); |
| 454 | dup2(p[1], STDERR_FILENO); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 455 | close(p[0]); |
| 456 | close(p[1]); |
| 457 | close(devnull); |
| 458 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 459 | setuid(original_uid); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 460 | execv(src->path, (char**)(src->args)); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 461 | debug("(child) Couldn't exec '%s': %s", src->cmdstring, |
| 462 | strerror(errno)); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 463 | _exit(-1); |
| 464 | default: /* Parent */ |
| 465 | break; |
| 466 | } |
| 467 | |
| 468 | RAND_add(&pid, sizeof(&pid), 0.0); |
| 469 | |
| 470 | close(p[1]); |
| 471 | |
| 472 | /* Hash output from child */ |
| 473 | SHA1_Init(&sha); |
| 474 | total_bytes_read = 0; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 475 | |
| 476 | while (!error_abort && !cmd_eof) { |
| 477 | int ret; |
| 478 | struct timeval tv; |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 479 | int msec_remaining; |
| 480 | |
| 481 | (void) gettimeofday(&tv_current, 0); |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 482 | msec_elapsed = _get_timeval_msec_difference(&tv_start, &tv_current); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 483 | if (msec_elapsed >= entropy_timeout_current) { |
| 484 | error_abort=1; |
| 485 | continue; |
| 486 | } |
| 487 | msec_remaining = entropy_timeout_current - msec_elapsed; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 488 | |
| 489 | FD_ZERO(&rdset); |
| 490 | FD_SET(p[0], &rdset); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 491 | tv.tv_sec = msec_remaining / 1000; |
| 492 | tv.tv_usec = (msec_remaining % 1000) * 1000; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 493 | |
| 494 | ret = select(p[0]+1, &rdset, NULL, NULL, &tv); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 495 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 496 | RAND_add(&tv, sizeof(tv), 0.0); |
| 497 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 498 | switch (ret) { |
| 499 | case 0: |
| 500 | /* timer expired */ |
| 501 | error_abort = 1; |
| 502 | break; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 503 | case 1: |
| 504 | /* command input */ |
| 505 | bytes_read = read(p[0], buf, sizeof(buf)); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 506 | RAND_add(&bytes_read, sizeof(&bytes_read), 0.0); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 507 | if (bytes_read == -1) { |
| 508 | error_abort = 1; |
| 509 | break; |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 510 | } else if (bytes_read) { |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 511 | SHA1_Update(&sha, buf, bytes_read); |
| 512 | total_bytes_read += bytes_read; |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 513 | } else { |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 514 | cmd_eof = 1; |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 515 | } |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 516 | break; |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 517 | case -1: |
| 518 | default: |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 519 | /* error */ |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 520 | debug("Command '%s': select() failed: %s", src->cmdstring, |
| 521 | strerror(errno)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 522 | error_abort = 1; |
| 523 | break; |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 524 | } |
| 525 | } |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 526 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 527 | SHA1_Final(hash, &sha); |
| 528 | |
| 529 | close(p[0]); |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 530 | |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 531 | debug3("Time elapsed: %d msec", msec_elapsed); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 532 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 533 | if (waitpid(pid, &status, 0) == -1) { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 534 | error("Couldn't wait for child '%s' completion: %s", src->cmdstring, |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 535 | strerror(errno)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 536 | return(0.0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 537 | } |
| 538 | |
| 539 | RAND_add(&status, sizeof(&status), 0.0); |
| 540 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 541 | if (error_abort) { |
| 542 | /* closing p[0] on timeout causes the entropy command to |
| 543 | * SIGPIPE. Take whatever output we got, and mark this command |
| 544 | * as slow */ |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 545 | debug2("Command '%s' timed out", src->cmdstring); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 546 | src->sticky_badness *= 2; |
| 547 | src->badness = src->sticky_badness; |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 548 | return(total_bytes_read); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | if (WIFEXITED(status)) { |
| 552 | if (WEXITSTATUS(status)==0) { |
| 553 | return(total_bytes_read); |
| 554 | } else { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 555 | debug2("Command '%s' exit status was %d", src->cmdstring, |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 556 | WEXITSTATUS(status)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 557 | src->badness = src->sticky_badness = 128; |
| 558 | return (0.0); |
| 559 | } |
| 560 | } else if (WIFSIGNALED(status)) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 561 | debug2("Command '%s' returned on uncaught signal %d !", src->cmdstring, |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 562 | status); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 563 | src->badness = src->sticky_badness = 128; |
| 564 | return(0.0); |
| 565 | } else |
| 566 | return(0.0); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 567 | } |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 568 | |
| 569 | /* |
| 570 | * prng seedfile functions |
| 571 | */ |
| 572 | int |
| 573 | prng_check_seedfile(char *filename) { |
| 574 | |
| 575 | struct stat st; |
| 576 | |
| 577 | /* FIXME raceable: eg replace seed between this stat and subsequent open */ |
| 578 | /* Not such a problem because we don't trust the seed file anyway */ |
| 579 | if (lstat(filename, &st) == -1) { |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 580 | /* Give up on hard errors */ |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 581 | if (errno != ENOENT) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 582 | debug("WARNING: Couldn't stat random seed file \"%s\": %s", |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 583 | filename, strerror(errno)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 584 | |
| 585 | return(0); |
| 586 | } |
| 587 | |
| 588 | /* regular file? */ |
| 589 | if (!S_ISREG(st.st_mode)) |
| 590 | fatal("PRNG seedfile %.100s is not a regular file", filename); |
| 591 | |
| 592 | /* mode 0600, owned by root or the current user? */ |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 593 | if (((st.st_mode & 0177) != 0) || !(st.st_uid == original_uid)) { |
| 594 | debug("WARNING: PRNG seedfile %.100s must be mode 0600, owned by uid %d", |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 595 | filename, getuid()); |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 596 | return(0); |
| 597 | } |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 598 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 599 | return(1); |
| 600 | } |
| 601 | |
| 602 | void |
| 603 | prng_write_seedfile(void) { |
| 604 | int fd; |
| 605 | char seed[1024]; |
| 606 | char filename[1024]; |
| 607 | struct passwd *pw; |
| 608 | |
| 609 | /* Don't bother if we have already saved a seed */ |
| 610 | if (prng_seed_saved) |
| 611 | return; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 612 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 613 | setuid(original_uid); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 614 | |
Damien Miller | fc0b11b | 2000-05-02 00:03:55 +1000 | [diff] [blame] | 615 | prng_seed_saved = 1; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 616 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 617 | pw = getpwuid(original_uid); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 618 | if (pw == NULL) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 619 | fatal("Couldn't get password entry for current user (%i): %s", |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 620 | original_uid, strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 621 | |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 622 | /* Try to ensure that the parent directory is there */ |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 623 | snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir, |
Ben Lindstrom | cb57733 | 2001-01-22 21:06:19 +0000 | [diff] [blame] | 624 | _PATH_SSH_USER_DIR); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 625 | mkdir(filename, 0700); |
| 626 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 627 | snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir, |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 628 | SSH_PRNG_SEED_FILE); |
| 629 | |
| 630 | debug("writing PRNG seed to file %.100s", filename); |
| 631 | |
| 632 | RAND_bytes(seed, sizeof(seed)); |
| 633 | |
| 634 | /* Don't care if the seed doesn't exist */ |
| 635 | prng_check_seedfile(filename); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 636 | |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 637 | if ((fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0600)) == -1) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 638 | debug("WARNING: couldn't access PRNG seedfile %.100s (%.100s)", |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 639 | filename, strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 640 | } else { |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 641 | if (atomicio(write, fd, &seed, sizeof(seed)) != sizeof(seed)) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 642 | fatal("problem writing PRNG seedfile %.100s (%.100s)", filename, |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 643 | strerror(errno)); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 644 | |
Damien Miller | 52dc96b | 2000-10-16 20:13:43 +1100 | [diff] [blame] | 645 | close(fd); |
| 646 | } |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | void |
| 650 | prng_read_seedfile(void) { |
| 651 | int fd; |
| 652 | char seed[1024]; |
| 653 | char filename[1024]; |
| 654 | struct passwd *pw; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 655 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 656 | pw = getpwuid(original_uid); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 657 | if (pw == NULL) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 658 | fatal("Couldn't get password entry for current user (%i): %s", |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 659 | original_uid, strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 660 | |
| 661 | snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir, |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 662 | SSH_PRNG_SEED_FILE); |
| 663 | |
| 664 | debug("loading PRNG seed from file %.100s", filename); |
| 665 | |
| 666 | if (!prng_check_seedfile(filename)) { |
Damien Miller | 21de450 | 2001-01-17 09:37:15 +1100 | [diff] [blame] | 667 | verbose("Random seed file not found or not valid, ignoring."); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 668 | return; |
| 669 | } |
| 670 | |
| 671 | /* open the file and read in the seed */ |
| 672 | fd = open(filename, O_RDONLY); |
| 673 | if (fd == -1) |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 674 | fatal("could not open PRNG seedfile %.100s (%.100s)", filename, |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 675 | strerror(errno)); |
| 676 | |
| 677 | if (atomicio(read, fd, &seed, sizeof(seed)) != sizeof(seed)) { |
| 678 | verbose("invalid or short read from PRNG seedfile %.100s - ignoring", |
| 679 | filename); |
| 680 | memset(seed, '\0', sizeof(seed)); |
| 681 | } |
| 682 | close(fd); |
| 683 | |
| 684 | /* stir in the seed, with estimated entropy zero */ |
| 685 | RAND_add(&seed, sizeof(seed), 0.0); |
| 686 | } |
| 687 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 688 | |
| 689 | /* |
| 690 | * entropy command initialisation functions |
| 691 | */ |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 692 | int |
| 693 | prng_read_commands(char *cmdfilename) |
| 694 | { |
| 695 | FILE *f; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 696 | char *cp; |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 697 | char line[1024]; |
| 698 | char cmd[1024]; |
| 699 | char path[256]; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 700 | int linenum; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 701 | int num_cmds = 64; |
| 702 | int cur_cmd = 0; |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 703 | double est; |
| 704 | entropy_source_t *entcmd; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 705 | |
| 706 | f = fopen(cmdfilename, "r"); |
| 707 | if (!f) { |
| 708 | fatal("couldn't read entropy commands file %.100s: %.100s", |
| 709 | cmdfilename, strerror(errno)); |
| 710 | } |
| 711 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 712 | entcmd = (entropy_source_t *)xmalloc(num_cmds * sizeof(entropy_source_t)); |
| 713 | memset(entcmd, '\0', num_cmds * sizeof(entropy_source_t)); |
| 714 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 715 | /* Read in file */ |
| 716 | linenum = 0; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 717 | while (fgets(line, sizeof(line), f)) { |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 718 | int arg; |
| 719 | char *argv; |
| 720 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 721 | linenum++; |
| 722 | |
| 723 | /* skip leading whitespace, test for blank line or comment */ |
| 724 | cp = line + strspn(line, WHITESPACE); |
| 725 | if ((*cp == 0) || (*cp == '#')) |
| 726 | continue; /* done with this line */ |
| 727 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 728 | /* First non-whitespace char should be double quote delimiting */ |
| 729 | /* commandline */ |
| 730 | if (*cp != '"') { |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 731 | error("bad entropy command, %.100s line %d", cmdfilename, |
| 732 | linenum); |
| 733 | continue; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 734 | } |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 735 | |
| 736 | /* first token, command args (incl. argv[0]) in double quotes */ |
| 737 | cp = strtok(cp, "\""); |
| 738 | if (cp == NULL) { |
| 739 | error("missing or bad command string, %.100s line %d -- ignored", |
| 740 | cmdfilename, linenum); |
| 741 | continue; |
| 742 | } |
| 743 | strlcpy(cmd, cp, sizeof(cmd)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 744 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 745 | /* second token, full command path */ |
| 746 | if ((cp = strtok(NULL, WHITESPACE)) == NULL) { |
| 747 | error("missing command path, %.100s line %d -- ignored", |
| 748 | cmdfilename, linenum); |
| 749 | continue; |
| 750 | } |
| 751 | |
| 752 | /* did configure mark this as dead? */ |
| 753 | if (strncmp("undef", cp, 5) == 0) |
| 754 | continue; |
| 755 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 756 | strlcpy(path, cp, sizeof(path)); |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 757 | |
| 758 | /* third token, entropy rate estimate for this command */ |
| 759 | if ((cp = strtok(NULL, WHITESPACE)) == NULL) { |
| 760 | error("missing entropy estimate, %.100s line %d -- ignored", |
| 761 | cmdfilename, linenum); |
| 762 | continue; |
| 763 | } |
| 764 | est = strtod(cp, &argv); |
| 765 | |
| 766 | /* end of line */ |
| 767 | if ((cp = strtok(NULL, WHITESPACE)) != NULL) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 768 | error("garbage at end of line %d in %.100s -- ignored", linenum, |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 769 | cmdfilename); |
| 770 | continue; |
| 771 | } |
| 772 | |
| 773 | /* save the command for debug messages */ |
| 774 | entcmd[cur_cmd].cmdstring = xstrdup(cmd); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 775 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 776 | /* split the command args */ |
| 777 | cp = strtok(cmd, WHITESPACE); |
| 778 | arg = 0; |
| 779 | argv = NULL; |
| 780 | do { |
| 781 | char *s = (char*)xmalloc(strlen(cp) + 1); |
| 782 | strncpy(s, cp, strlen(cp) + 1); |
| 783 | entcmd[cur_cmd].args[arg] = s; |
| 784 | arg++; |
| 785 | } while ((arg < 5) && (cp = strtok(NULL, WHITESPACE))); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 786 | |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 787 | if (strtok(NULL, WHITESPACE)) |
| 788 | error("ignored extra command elements (max 5), %.100s line %d", |
| 789 | cmdfilename, linenum); |
| 790 | |
| 791 | /* Copy the command path and rate estimate */ |
| 792 | entcmd[cur_cmd].path = xstrdup(path); |
| 793 | entcmd[cur_cmd].rate = est; |
| 794 | |
| 795 | /* Initialise other values */ |
| 796 | entcmd[cur_cmd].sticky_badness = 1; |
| 797 | |
| 798 | cur_cmd++; |
| 799 | |
| 800 | /* If we've filled the array, reallocate it twice the size */ |
| 801 | /* Do this now because even if this we're on the last command, |
| 802 | we need another slot to mark the last entry */ |
| 803 | if (cur_cmd == num_cmds) { |
| 804 | num_cmds *= 2; |
| 805 | entcmd = xrealloc(entcmd, num_cmds * sizeof(entropy_source_t)); |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 806 | } |
| 807 | } |
| 808 | |
| 809 | /* zero the last entry */ |
| 810 | memset(&entcmd[cur_cmd], '\0', sizeof(entropy_source_t)); |
Damien Miller | 14c12cb | 2000-06-07 22:20:23 +1000 | [diff] [blame] | 811 | |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 812 | /* trim to size */ |
| 813 | entropy_sources = xrealloc(entcmd, (cur_cmd+1) * sizeof(entropy_source_t)); |
| 814 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 815 | debug("Loaded %d entropy commands from %.100s", cur_cmd, cmdfilename); |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 816 | |
| 817 | return (cur_cmd >= MIN_ENTROPY_SOURCES); |
| 818 | } |
| 819 | |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 820 | /* |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 821 | * Write a keyfile at exit |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 822 | */ |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 823 | void |
| 824 | prng_seed_cleanup(void *junk) |
| 825 | { |
| 826 | prng_write_seedfile(); |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * Conditionally Seed OpenSSL's random number pool from |
| 831 | * syscalls and program output |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 832 | */ |
| 833 | void |
| 834 | seed_rng(void) |
| 835 | { |
Damien Miller | a1072a8 | 2001-02-18 15:28:11 +1100 | [diff] [blame] | 836 | mysig_t old_sigchld_handler; |
Damien Miller | 0437b33 | 2000-05-02 09:56:41 +1000 | [diff] [blame] | 837 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 838 | if (!prng_initialised) |
| 839 | fatal("RNG not initialised"); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 840 | |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 841 | /* Make sure some other sigchld handler doesn't reap our entropy */ |
| 842 | /* commands */ |
Damien Miller | a1072a8 | 2001-02-18 15:28:11 +1100 | [diff] [blame] | 843 | old_sigchld_handler = mysignal(SIGCHLD, SIG_DFL); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 844 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 845 | debug("Seeded RNG with %i bytes from programs", (int)stir_from_programs()); |
| 846 | debug("Seeded RNG with %i bytes from system calls", (int)stir_from_system()); |
| 847 | |
| 848 | if (!RAND_status()) |
| 849 | fatal("Not enough entropy in RNG"); |
Damien Miller | 4018c19 | 2000-04-30 09:30:44 +1000 | [diff] [blame] | 850 | |
Damien Miller | a1072a8 | 2001-02-18 15:28:11 +1100 | [diff] [blame] | 851 | mysignal(SIGCHLD, old_sigchld_handler); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 852 | |
Damien Miller | 8d1fd57 | 2000-05-17 21:34:07 +1000 | [diff] [blame] | 853 | if (!RAND_status()) |
| 854 | fatal("Couldn't initialise builtin random number generator -- exiting."); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 855 | } |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 856 | |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 857 | void init_rng(void) |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 858 | { |
Damien Miller | d592b63 | 2000-11-25 10:09:32 +1100 | [diff] [blame] | 859 | int original_euid; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 860 | |
Damien Miller | 767c7fc | 2001-02-27 09:20:57 +1100 | [diff] [blame] | 861 | check_openssl_version(); |
| 862 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 863 | original_uid = getuid(); |
Damien Miller | d592b63 | 2000-11-25 10:09:32 +1100 | [diff] [blame] | 864 | original_euid = geteuid(); |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 865 | |
| 866 | /* Read in collection commands */ |
| 867 | if (!prng_read_commands(SSH_PRNG_COMMAND_FILE)) |
| 868 | fatal("PRNG initialisation failed -- exiting."); |
| 869 | |
| 870 | /* Set ourselves up to save a seed upon exit */ |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 871 | prng_seed_saved = 0; |
Damien Miller | d592b63 | 2000-11-25 10:09:32 +1100 | [diff] [blame] | 872 | |
| 873 | /* Give up privs while reading seed file */ |
Damien Miller | bb7c976 | 2001-02-26 20:49:58 +1100 | [diff] [blame] | 874 | #ifdef SAVED_IDS_WORK_WITH_SETEUID |
Damien Miller | d592b63 | 2000-11-25 10:09:32 +1100 | [diff] [blame] | 875 | if ((original_uid != original_euid) && (seteuid(original_uid) == -1)) |
| 876 | fatal("Couldn't give up privileges"); |
Damien Miller | bb7c976 | 2001-02-26 20:49:58 +1100 | [diff] [blame] | 877 | #else /* SAVED_IDS_WORK_WITH_SETEUID */ |
| 878 | /* |
| 879 | * Propagate the privileged uid to all of our uids. |
| 880 | * Set the effective uid to the given (unprivileged) uid. |
| 881 | */ |
Damien Miller | 248131a | 2001-02-27 09:47:16 +1100 | [diff] [blame] | 882 | if (original_uid != original_euid && (setuid(original_euid) == -1 || |
| 883 | seteuid(original_uid) == -1)) |
Damien Miller | bb7c976 | 2001-02-26 20:49:58 +1100 | [diff] [blame] | 884 | fatal("Couldn't give up privileges"); |
| 885 | #endif /* SAVED_IDS_WORK_WITH_SETEUID */ |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 886 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 887 | prng_read_seedfile(); |
Damien Miller | d592b63 | 2000-11-25 10:09:32 +1100 | [diff] [blame] | 888 | |
Damien Miller | bb7c976 | 2001-02-26 20:49:58 +1100 | [diff] [blame] | 889 | #ifdef SAVED_IDS_WORK_WITH_SETEUID |
Damien Miller | d592b63 | 2000-11-25 10:09:32 +1100 | [diff] [blame] | 890 | if ((original_uid != original_euid) && (seteuid(original_euid) == -1)) |
| 891 | fatal("Couldn't restore privileges"); |
Damien Miller | bb7c976 | 2001-02-26 20:49:58 +1100 | [diff] [blame] | 892 | #else /* SAVED_IDS_WORK_WITH_SETEUID */ |
| 893 | /* |
| 894 | * We are unable to restore the real uid to its unprivileged value. |
| 895 | * Propagate the real uid (usually more privileged) to effective uid |
| 896 | * as well. |
| 897 | */ |
Damien Miller | 248131a | 2001-02-27 09:47:16 +1100 | [diff] [blame] | 898 | if (original_uid != original_euid && (seteuid(original_euid) == -1 || |
| 899 | setuid(original_uid) == -1)) |
Damien Miller | bb7c976 | 2001-02-26 20:49:58 +1100 | [diff] [blame] | 900 | fatal("Couldn't restore privileges"); |
| 901 | #endif /* SAVED_IDS_WORK_WITH_SETEUID */ |
Damien Miller | d592b63 | 2000-11-25 10:09:32 +1100 | [diff] [blame] | 902 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 903 | fatal_add_cleanup(prng_seed_cleanup, NULL); |
| 904 | atexit(prng_write_seedfile); |
| 905 | |
| 906 | prng_initialised = 1; |
| 907 | } |
| 908 | |
Damien Miller | d0ccb98 | 2001-03-04 00:29:20 +1100 | [diff] [blame] | 909 | #endif /* defined(USE_PRNGD) || defined(RANDOM_POOL) */ |