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annotate random.c @ 185:5ccad7634388

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* warn if we seem to be blocking on /dev/random
author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 Apr 2005 15:56:36 +0000
parents 4bd4fc8023bd
children 06e326daf16a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
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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
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29 int donerandinit = 0;
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30
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31 /* this is used to generate unique output from the same hashpool */
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32 unsigned int counter = 0;
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33 #define MAX_COUNTER 1000000/* the max value for the counter, so it won't loop */
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34
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35 unsigned char hashpool[SHA1_HASH_SIZE];
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36
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37 #define INIT_SEED_SIZE 32 /* 256 bits */
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38
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39 static void readrand(unsigned char* buf, unsigned int buflen);
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40
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41 /* The basic setup is we read some data from /dev/(u)random or prngd and hash it
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42 * into hashpool. To read data, we hash together current hashpool contents,
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43 * and a counter. We feed more data in by hashing the current pool and new
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44 * data into the pool.
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45 *
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46 * It is important to ensure that counter doesn't wrap around before we
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47 * feed in new entropy.
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48 *
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49 */
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50
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51 static void readrand(unsigned char* buf, unsigned int buflen) {
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52
185
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53 static int already_blocked = 0;
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54 int readfd;
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55 unsigned int readpos;
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56 int readlen;
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57 #ifdef DROPBEAR_PRNGD_SOCKET
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58 struct sockaddr_un egdsock;
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59 char egdcmd[2];
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60 #endif
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61
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62 #ifdef DROPBEAR_RANDOM_DEV
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63 readfd = open(DROPBEAR_RANDOM_DEV, O_RDONLY);
70
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64 if (readfd < 0) {
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65 dropbear_exit("couldn't open random device");
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66 }
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67 #endif
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68
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69 #ifdef DROPBEAR_PRNGD_SOCKET
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70 memset((void*)&egdsock, 0x0, sizeof(egdsock));
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71 egdsock.sun_family = AF_UNIX;
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72 strlcpy(egdsock.sun_path, DROPBEAR_PRNGD_SOCKET,
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73 sizeof(egdsock.sun_path));
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74
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75 readfd = socket(PF_UNIX, SOCK_STREAM, 0);
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76 if (readfd < 0) {
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77 dropbear_exit("couldn't open random device");
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78 }
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79 /* todo - try various common locations */
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80 if (connect(readfd, (struct sockaddr*)&egdsock,
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81 sizeof(struct sockaddr_un)) < 0) {
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82 dropbear_exit("couldn't open random device");
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83 }
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84
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85 if (buflen > 255)
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86 dropbear_exit("can't request more than 255 bytes from egd");
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87 egdcmd[0] = 0x02; /* blocking read */
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88 egdcmd[1] = (unsigned char)buflen;
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89 if (write(readfd, egdcmd, 2) < 0)
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90 dropbear_exit("can't send command to egd");
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91 #endif
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92
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93 /* read the actual random data */
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94 readpos = 0;
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95 do {
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96 if (!already_blocked)
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97 {
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98 int ret;
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99 struct timeval timeout;
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100 fd_set read_fds;
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101
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102 timeout.tv_sec = 2; /* two seconds should be enough */
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103 timeout.tv_usec = 0;
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104
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105 FD_ZERO(&read_fds);
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106 FD_SET(readfd, &read_fds);
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107 ret = select(readfd + 1, &read_fds, NULL, NULL, &timeout);
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108 if (ret == 0)
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109 {
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110 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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111 already_blocked = 1;
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112 }
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113 }
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114 readlen = read(readfd, &buf[readpos], buflen - readpos);
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115 if (readlen <= 0) {
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116 if (readlen < 0 && errno == EINTR) {
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117 continue;
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118 }
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119 dropbear_exit("error reading random source");
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120 }
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121 readpos += readlen;
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122 } while (readpos < buflen);
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123
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124 close (readfd);
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125 }
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126
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127 /* initialise the prng from /dev/(u)random or prngd */
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128 void seedrandom() {
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129
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130 unsigned char readbuf[INIT_SEED_SIZE];
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131
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132 hash_state hs;
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133
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134 /* initialise so compilers will be happy about hashing it */
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135 if (!donerandinit) {
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136 m_burn(hashpool, sizeof(hashpool));
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137 }
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138
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139 /* get the seed data */
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140 readrand(readbuf, sizeof(readbuf));
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141
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142 /* hash in the new seed data */
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143 sha1_init(&hs);
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144 sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
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145 sha1_process(&hs, (void*)readbuf, sizeof(readbuf));
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146 sha1_done(&hs, hashpool);
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147
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148 counter = 0;
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149 donerandinit = 1;
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150 }
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151
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152 /* return len bytes of pseudo-random data */
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153 void genrandom(unsigned char* buf, unsigned int len) {
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154
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155 hash_state hs;
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156 unsigned char hash[SHA1_HASH_SIZE];
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157 unsigned int copylen;
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158
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159 if (!donerandinit) {
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160 dropbear_exit("seedrandom not done");
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161 }
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162
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163 while (len > 0) {
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164 sha1_init(&hs);
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165 sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
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166 sha1_process(&hs, (void*)&counter, sizeof(counter));
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167 sha1_done(&hs, hash);
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168
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169 counter++;
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170 if (counter > MAX_COUNTER) {
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171 seedrandom();
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172 }
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173
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174 copylen = MIN(len, SHA1_HASH_SIZE);
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175 memcpy(buf, hash, copylen);
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176 len -= copylen;
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177 buf += copylen;
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178 }
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179 m_burn(hash, sizeof(hash));
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180 }