1 /* crypto/rand/rand_egd.c */ 2 /* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */ 3 /* ==================================================================== 4 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * 3. All advertising materials mentioning features or use of this 19 * software must display the following acknowledgment: 20 * "This product includes software developed by the OpenSSL Project 21 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 22 * 23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 24 * endorse or promote products derived from this software without 25 * prior written permission. For written permission, please contact 26 * openssl-core@openssl.org. 27 * 28 * 5. Products derived from this software may not be called "OpenSSL" 29 * nor may "OpenSSL" appear in their names without prior written 30 * permission of the OpenSSL Project. 31 * 32 * 6. Redistributions of any form whatsoever must retain the following 33 * acknowledgment: 34 * "This product includes software developed by the OpenSSL Project 35 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 40 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 48 * OF THE POSSIBILITY OF SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This product includes cryptographic software written by Eric Young 52 * (eay@cryptsoft.com). This product includes software written by Tim 53 * Hudson (tjh@cryptsoft.com). 54 * 55 */ 56 57 #include <openssl/e_os2.h> 58 #include <openssl/rand.h> 59 #include <openssl/buffer.h> 60 61 /* 62 * Query the EGD <URL: http://www.lothar.com/tech/crypto/>. 63 * 64 * This module supplies three routines: 65 * 66 * RAND_query_egd_bytes(path, buf, bytes) 67 * will actually query "bytes" bytes of entropy form the egd-socket located 68 * at path and will write them to buf (if supplied) or will directly feed 69 * it to RAND_seed() if buf==NULL. 70 * The number of bytes is not limited by the maximum chunk size of EGD, 71 * which is 255 bytes. If more than 255 bytes are wanted, several chunks 72 * of entropy bytes are requested. The connection is left open until the 73 * query is competed. 74 * RAND_query_egd_bytes() returns with 75 * -1 if an error occured during connection or communication. 76 * num the number of bytes read from the EGD socket. This number is either 77 * the number of bytes requested or smaller, if the EGD pool is 78 * drained and the daemon signals that the pool is empty. 79 * This routine does not touch any RAND_status(). This is necessary, since 80 * PRNG functions may call it during initialization. 81 * 82 * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them 83 * used to seed the PRNG. 84 * RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL. 85 * Unlike RAND_query_egd_bytes(), RAND_status() is used to test the 86 * seed status so that the return value can reflect the seed state: 87 * -1 if an error occured during connection or communication _or_ 88 * if the PRNG has still not received the required seeding. 89 * num the number of bytes read from the EGD socket. This number is either 90 * the number of bytes requested or smaller, if the EGD pool is 91 * drained and the daemon signals that the pool is empty. 92 * 93 * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed 94 * the PRNG. 95 * RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255. 96 */ 97 98 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_VOS) 99 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes) 100 { 101 return(-1); 102 } 103 int RAND_egd(const char *path) 104 { 105 return(-1); 106 } 107 108 int RAND_egd_bytes(const char *path,int bytes) 109 { 110 return(-1); 111 } 112 #else 113 #include <openssl/opensslconf.h> 114 #include OPENSSL_UNISTD 115 #include <sys/types.h> 116 #include <sys/socket.h> 117 #ifndef NO_SYS_UN_H 118 # ifdef OPENSSL_SYS_VXWORKS 119 # include <streams/un.h> 120 # else 121 # include <sys/un.h> 122 # endif 123 #else 124 struct sockaddr_un { 125 short sun_family; /* AF_UNIX */ 126 char sun_path[108]; /* path name (gag) */ 127 }; 128 #endif /* NO_SYS_UN_H */ 129 #include <string.h> 130 #include <errno.h> 131 132 #ifndef offsetof 133 # define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 134 #endif 135 136 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes) 137 { 138 int ret = 0; 139 struct sockaddr_un addr; 140 int len, num, numbytes; 141 int fd = -1; 142 int success; 143 unsigned char egdbuf[2], tempbuf[255], *retrievebuf; 144 145 memset(&addr, 0, sizeof(addr)); 146 addr.sun_family = AF_UNIX; 147 if (strlen(path) >= sizeof(addr.sun_path)) 148 return (-1); 149 BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path); 150 len = offsetof(struct sockaddr_un, sun_path) + strlen(path); 151 fd = socket(AF_UNIX, SOCK_STREAM, 0); 152 if (fd == -1) return (-1); 153 success = 0; 154 while (!success) 155 { 156 if (connect(fd, (struct sockaddr *)&addr, len) == 0) 157 success = 1; 158 else 159 { 160 switch (errno) 161 { 162 #ifdef EINTR 163 case EINTR: 164 #endif 165 #ifdef EAGAIN 166 case EAGAIN: 167 #endif 168 #ifdef EINPROGRESS 169 case EINPROGRESS: 170 #endif 171 #ifdef EALREADY 172 case EALREADY: 173 #endif 174 /* No error, try again */ 175 break; 176 #ifdef EISCONN 177 case EISCONN: 178 success = 1; 179 break; 180 #endif 181 default: 182 goto err; /* failure */ 183 } 184 } 185 } 186 187 while(bytes > 0) 188 { 189 egdbuf[0] = 1; 190 egdbuf[1] = bytes < 255 ? bytes : 255; 191 numbytes = 0; 192 while (numbytes != 2) 193 { 194 num = write(fd, egdbuf + numbytes, 2 - numbytes); 195 if (num >= 0) 196 numbytes += num; 197 else 198 { 199 switch (errno) 200 { 201 #ifdef EINTR 202 case EINTR: 203 #endif 204 #ifdef EAGAIN 205 case EAGAIN: 206 #endif 207 /* No error, try again */ 208 break; 209 default: 210 ret = -1; 211 goto err; /* failure */ 212 } 213 } 214 } 215 numbytes = 0; 216 while (numbytes != 1) 217 { 218 num = read(fd, egdbuf, 1); 219 if (num == 0) 220 goto err; /* descriptor closed */ 221 else if (num > 0) 222 numbytes += num; 223 else 224 { 225 switch (errno) 226 { 227 #ifdef EINTR 228 case EINTR: 229 #endif 230 #ifdef EAGAIN 231 case EAGAIN: 232 #endif 233 /* No error, try again */ 234 break; 235 default: 236 ret = -1; 237 goto err; /* failure */ 238 } 239 } 240 } 241 if(egdbuf[0] == 0) 242 goto err; 243 if (buf) 244 retrievebuf = buf + ret; 245 else 246 retrievebuf = tempbuf; 247 numbytes = 0; 248 while (numbytes != egdbuf[0]) 249 { 250 num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes); 251 if (num == 0) 252 goto err; /* descriptor closed */ 253 else if (num > 0) 254 numbytes += num; 255 else 256 { 257 switch (errno) 258 { 259 #ifdef EINTR 260 case EINTR: 261 #endif 262 #ifdef EAGAIN 263 case EAGAIN: 264 #endif 265 /* No error, try again */ 266 break; 267 default: 268 ret = -1; 269 goto err; /* failure */ 270 } 271 } 272 } 273 ret += egdbuf[0]; 274 bytes -= egdbuf[0]; 275 if (!buf) 276 RAND_seed(tempbuf, egdbuf[0]); 277 } 278 err: 279 if (fd != -1) close(fd); 280 return(ret); 281 } 282 283 284 int RAND_egd_bytes(const char *path, int bytes) 285 { 286 int num, ret = 0; 287 288 num = RAND_query_egd_bytes(path, NULL, bytes); 289 if (num < 1) goto err; 290 if (RAND_status() == 1) 291 ret = num; 292 err: 293 return(ret); 294 } 295 296 297 int RAND_egd(const char *path) 298 { 299 return (RAND_egd_bytes(path, 255)); 300 } 301 302 303 #endif 304