annotate random.c @ 537:7de2f22ea759

- Add the signal pipe to maxfd
author Matt Johnston <matt@ucc.asn.au>
date Tue, 17 Mar 2009 22:30:25 +0000
parents 2cd2edfa11ee
children c1e9c81d1d27 76097ec1a29a
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "buffer.h"
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27 #include "dbutil.h"
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28 #include "bignum.h"
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29
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30 static int donerandinit = 0;
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31
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32 /* this is used to generate unique output from the same hashpool */
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33 static uint32_t counter = 0;
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34 /* the max value for the counter, so it won't integer overflow */
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35 #define MAX_COUNTER 1<<30
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37 static unsigned char hashpool[SHA1_HASH_SIZE];
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38
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39 #define INIT_SEED_SIZE 32 /* 256 bits */
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41 static void readrand(unsigned char* buf, unsigned int buflen);
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42
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43 /* The basic setup is we read some data from /dev/(u)random or prngd and hash it
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44 * into hashpool. To read data, we hash together current hashpool contents,
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45 * and a counter. We feed more data in by hashing the current pool and new
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46 * data into the pool.
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47 *
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48 * It is important to ensure that counter doesn't wrap around before we
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49 * feed in new entropy.
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50 *
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51 */
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52
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53 static void readrand(unsigned char* buf, unsigned int buflen) {
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54
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55 static int already_blocked = 0;
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56 int readfd;
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57 unsigned int readpos;
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58 int readlen;
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59 #ifdef DROPBEAR_PRNGD_SOCKET
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60 struct sockaddr_un egdsock;
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61 char egdcmd[2];
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62 #endif
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63
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64 #ifdef DROPBEAR_RANDOM_DEV
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65 readfd = open(DROPBEAR_RANDOM_DEV, O_RDONLY);
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66 if (readfd < 0) {
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67 dropbear_exit("couldn't open random device");
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68 }
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69 #endif
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70
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71 #ifdef DROPBEAR_PRNGD_SOCKET
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72 memset((void*)&egdsock, 0x0, sizeof(egdsock));
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73 egdsock.sun_family = AF_UNIX;
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74 strlcpy(egdsock.sun_path, DROPBEAR_PRNGD_SOCKET,
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75 sizeof(egdsock.sun_path));
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76
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77 readfd = socket(PF_UNIX, SOCK_STREAM, 0);
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78 if (readfd < 0) {
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79 dropbear_exit("couldn't open random device");
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80 }
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81 /* todo - try various common locations */
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82 if (connect(readfd, (struct sockaddr*)&egdsock,
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83 sizeof(struct sockaddr_un)) < 0) {
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84 dropbear_exit("couldn't open random device");
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85 }
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86
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87 if (buflen > 255)
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88 dropbear_exit("can't request more than 255 bytes from egd");
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89 egdcmd[0] = 0x02; /* blocking read */
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90 egdcmd[1] = (unsigned char)buflen;
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91 if (write(readfd, egdcmd, 2) < 0)
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92 dropbear_exit("can't send command to egd");
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93 #endif
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94
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95 /* read the actual random data */
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96 readpos = 0;
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97 do {
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98 if (!already_blocked)
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99 {
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100 int ret;
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101 struct timeval timeout;
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102 fd_set read_fds;
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103
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104 timeout.tv_sec = 2; /* two seconds should be enough */
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105 timeout.tv_usec = 0;
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106
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107 FD_ZERO(&read_fds);
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108 FD_SET(readfd, &read_fds);
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109 ret = select(readfd + 1, &read_fds, NULL, NULL, &timeout);
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110 if (ret == 0)
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111 {
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112 dropbear_log(LOG_INFO, "Warning: Reading the random source seems to have blocked.\nIf you experience problems, you probably need to find a better entropy source.");
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113 already_blocked = 1;
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114 }
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115 }
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116 readlen = read(readfd, &buf[readpos], buflen - readpos);
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117 if (readlen <= 0) {
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118 if (readlen < 0 && errno == EINTR) {
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119 continue;
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120 }
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121 dropbear_exit("error reading random source");
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122 }
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123 readpos += readlen;
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124 } while (readpos < buflen);
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125
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126 close (readfd);
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127 }
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128
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129 /* initialise the prng from /dev/(u)random or prngd */
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130 void seedrandom() {
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131
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132 unsigned char readbuf[INIT_SEED_SIZE];
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133
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134 hash_state hs;
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135
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136 /* initialise so that things won't warn about
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137 * hashing an undefined buffer */
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138 if (!donerandinit) {
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139 m_burn(hashpool, sizeof(hashpool));
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140 }
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141
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142 /* get the seed data */
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143 readrand(readbuf, sizeof(readbuf));
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144
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145 /* hash in the new seed data */
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146 sha1_init(&hs);
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147 sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
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148 sha1_process(&hs, (void*)readbuf, sizeof(readbuf));
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149 sha1_done(&hs, hashpool);
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150
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151 counter = 0;
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152 donerandinit = 1;
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153 }
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154
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155 /* hash the current random pool with some unique identifiers
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156 * for this process and point-in-time. this is used to separate
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157 * the random pools for fork()ed processes. */
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158 void reseedrandom() {
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159
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160 pid_t pid;
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161 hash_state hs;
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162 struct timeval tv;
272
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163
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164 if (!donerandinit) {
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165 dropbear_exit("seedrandom not done");
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166 }
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167
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168 pid = getpid();
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169 gettimeofday(&tv, NULL);
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170
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171 sha1_init(&hs);
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172 sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
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173 sha1_process(&hs, (void*)&pid, sizeof(pid));
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174 sha1_process(&hs, (void*)&tv, sizeof(tv));
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175 sha1_done(&hs, hashpool);
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176 }
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177
4
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178 /* return len bytes of pseudo-random data */
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179 void genrandom(unsigned char* buf, unsigned int len) {
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180
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181 hash_state hs;
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182 unsigned char hash[SHA1_HASH_SIZE];
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183 unsigned int copylen;
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184
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185 if (!donerandinit) {
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186 dropbear_exit("seedrandom not done");
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187 }
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188
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189 while (len > 0) {
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190 sha1_init(&hs);
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191 sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
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192 sha1_process(&hs, (void*)&counter, sizeof(counter));
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193 sha1_done(&hs, hash);
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194
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195 counter++;
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196 if (counter > MAX_COUNTER) {
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197 seedrandom();
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198 }
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199
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200 copylen = MIN(len, SHA1_HASH_SIZE);
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201 memcpy(buf, hash, copylen);
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202 len -= copylen;
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203 buf += copylen;
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204 }
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205 m_burn(hash, sizeof(hash));
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206 }
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207
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208 /* Generates a random mp_int.
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209 * max is a *mp_int specifying an upper bound.
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210 * rand must be an initialised *mp_int for the result.
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211 * the result rand satisfies: 0 < rand < max
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212 * */
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213 void gen_random_mpint(mp_int *max, mp_int *rand) {
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214
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215 unsigned char *randbuf = NULL;
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216 unsigned int len = 0;
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217 const unsigned char masks[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
188
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218
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219 const int size_bits = mp_count_bits(max);
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220
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221 len = size_bits / 8;
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222 if ((size_bits % 8) != 0) {
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223 len += 1;
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224 }
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225
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226 randbuf = (unsigned char*)m_malloc(len);
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227 do {
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228 genrandom(randbuf, len);
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229 /* Mask out the unrequired bits - mp_read_unsigned_bin expects
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230 * MSB first.*/
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231 randbuf[0] &= masks[size_bits % 8];
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232
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233 bytes_to_mp(rand, randbuf, len);
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234
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235 /* keep regenerating until we get one satisfying
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236 * 0 < rand < max */
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237 } while (mp_cmp(rand, max) != MP_LT);
188
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238 m_burn(randbuf, len);
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239 m_free(randbuf);
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240 }