[331] | 1 | /*
|
---|
| 2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
|
---|
| 3 | *
|
---|
| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
|
---|
| 5 | * this file except in compliance with the License. You can obtain a copy
|
---|
| 6 | * in the file LICENSE in the source distribution or at
|
---|
| 7 | * https://www.openssl.org/source/license.html
|
---|
| 8 | */
|
---|
| 9 |
|
---|
| 10 | #include <openssl/opensslconf.h>
|
---|
| 11 | #ifdef OPENSSL_NO_EGD
|
---|
| 12 | NON_EMPTY_TRANSLATION_UNIT
|
---|
| 13 | #else
|
---|
| 14 |
|
---|
| 15 | # include <openssl/crypto.h>
|
---|
| 16 | # include <openssl/e_os2.h>
|
---|
| 17 | # include <openssl/rand.h>
|
---|
| 18 |
|
---|
| 19 | /*-
|
---|
| 20 | * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
|
---|
| 21 | *
|
---|
| 22 | * This module supplies three routines:
|
---|
| 23 | *
|
---|
| 24 | * RAND_query_egd_bytes(path, buf, bytes)
|
---|
| 25 | * will actually query "bytes" bytes of entropy form the egd-socket located
|
---|
| 26 | * at path and will write them to buf (if supplied) or will directly feed
|
---|
| 27 | * it to RAND_seed() if buf==NULL.
|
---|
| 28 | * The number of bytes is not limited by the maximum chunk size of EGD,
|
---|
| 29 | * which is 255 bytes. If more than 255 bytes are wanted, several chunks
|
---|
| 30 | * of entropy bytes are requested. The connection is left open until the
|
---|
| 31 | * query is competed.
|
---|
| 32 | * RAND_query_egd_bytes() returns with
|
---|
| 33 | * -1 if an error occurred during connection or communication.
|
---|
| 34 | * num the number of bytes read from the EGD socket. This number is either
|
---|
| 35 | * the number of bytes requested or smaller, if the EGD pool is
|
---|
| 36 | * drained and the daemon signals that the pool is empty.
|
---|
| 37 | * This routine does not touch any RAND_status(). This is necessary, since
|
---|
| 38 | * PRNG functions may call it during initialization.
|
---|
| 39 | *
|
---|
| 40 | * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
|
---|
| 41 | * used to seed the PRNG.
|
---|
| 42 | * RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
|
---|
| 43 | * Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
|
---|
| 44 | * seed status so that the return value can reflect the seed state:
|
---|
| 45 | * -1 if an error occurred during connection or communication _or_
|
---|
| 46 | * if the PRNG has still not received the required seeding.
|
---|
| 47 | * num the number of bytes read from the EGD socket. This number is either
|
---|
| 48 | * the number of bytes requested or smaller, if the EGD pool is
|
---|
| 49 | * drained and the daemon signals that the pool is empty.
|
---|
| 50 | *
|
---|
| 51 | * RAND_egd(path) will query 255 bytes and use the bytes retrieved to seed
|
---|
| 52 | * the PRNG.
|
---|
| 53 | * RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
|
---|
| 54 | */
|
---|
| 55 |
|
---|
| 56 | # if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_VOS) || defined(OPENSSL_SYS_UEFI)
|
---|
| 57 | int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
|
---|
| 58 | {
|
---|
| 59 | return (-1);
|
---|
| 60 | }
|
---|
| 61 |
|
---|
| 62 | int RAND_egd(const char *path)
|
---|
| 63 | {
|
---|
| 64 | return (-1);
|
---|
| 65 | }
|
---|
| 66 |
|
---|
| 67 | int RAND_egd_bytes(const char *path, int bytes)
|
---|
| 68 | {
|
---|
| 69 | return (-1);
|
---|
| 70 | }
|
---|
| 71 | # else
|
---|
| 72 | # include <openssl/opensslconf.h>
|
---|
| 73 | # include OPENSSL_UNISTD
|
---|
| 74 | # include <stddef.h>
|
---|
| 75 | # include <sys/types.h>
|
---|
| 76 | # include <sys/socket.h>
|
---|
| 77 | # ifndef NO_SYS_UN_H
|
---|
| 78 | # ifdef OPENSSL_SYS_VXWORKS
|
---|
| 79 | # include <streams/un.h>
|
---|
| 80 | # else
|
---|
| 81 | # include <sys/un.h>
|
---|
| 82 | # endif
|
---|
| 83 | # else
|
---|
| 84 | struct sockaddr_un {
|
---|
| 85 | short sun_family; /* AF_UNIX */
|
---|
| 86 | char sun_path[108]; /* path name (gag) */
|
---|
| 87 | };
|
---|
| 88 | # endif /* NO_SYS_UN_H */
|
---|
| 89 | # include <string.h>
|
---|
| 90 | # include <errno.h>
|
---|
| 91 |
|
---|
| 92 | int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
|
---|
| 93 | {
|
---|
| 94 | int ret = 0;
|
---|
| 95 | struct sockaddr_un addr;
|
---|
| 96 | int len, num, numbytes;
|
---|
| 97 | int fd = -1;
|
---|
| 98 | int success;
|
---|
| 99 | unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
|
---|
| 100 |
|
---|
| 101 | memset(&addr, 0, sizeof(addr));
|
---|
| 102 | addr.sun_family = AF_UNIX;
|
---|
| 103 | if (strlen(path) >= sizeof(addr.sun_path))
|
---|
| 104 | return (-1);
|
---|
| 105 | OPENSSL_strlcpy(addr.sun_path, path, sizeof addr.sun_path);
|
---|
| 106 | len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
|
---|
| 107 | fd = socket(AF_UNIX, SOCK_STREAM, 0);
|
---|
| 108 | if (fd == -1)
|
---|
| 109 | return (-1);
|
---|
| 110 | success = 0;
|
---|
| 111 | while (!success) {
|
---|
| 112 | if (connect(fd, (struct sockaddr *)&addr, len) == 0)
|
---|
| 113 | success = 1;
|
---|
| 114 | else {
|
---|
| 115 | switch (errno) {
|
---|
| 116 | # ifdef EINTR
|
---|
| 117 | case EINTR:
|
---|
| 118 | # endif
|
---|
| 119 | # ifdef EAGAIN
|
---|
| 120 | case EAGAIN:
|
---|
| 121 | # endif
|
---|
| 122 | # ifdef EINPROGRESS
|
---|
| 123 | case EINPROGRESS:
|
---|
| 124 | # endif
|
---|
| 125 | # ifdef EALREADY
|
---|
| 126 | case EALREADY:
|
---|
| 127 | # endif
|
---|
| 128 | /* No error, try again */
|
---|
| 129 | break;
|
---|
| 130 | # ifdef EISCONN
|
---|
| 131 | case EISCONN:
|
---|
| 132 | success = 1;
|
---|
| 133 | break;
|
---|
| 134 | # endif
|
---|
| 135 | default:
|
---|
| 136 | ret = -1;
|
---|
| 137 | goto err; /* failure */
|
---|
| 138 | }
|
---|
| 139 | }
|
---|
| 140 | }
|
---|
| 141 |
|
---|
| 142 | while (bytes > 0) {
|
---|
| 143 | egdbuf[0] = 1;
|
---|
| 144 | egdbuf[1] = bytes < 255 ? bytes : 255;
|
---|
| 145 | numbytes = 0;
|
---|
| 146 | while (numbytes != 2) {
|
---|
| 147 | num = write(fd, egdbuf + numbytes, 2 - numbytes);
|
---|
| 148 | if (num >= 0)
|
---|
| 149 | numbytes += num;
|
---|
| 150 | else {
|
---|
| 151 | switch (errno) {
|
---|
| 152 | # ifdef EINTR
|
---|
| 153 | case EINTR:
|
---|
| 154 | # endif
|
---|
| 155 | # ifdef EAGAIN
|
---|
| 156 | case EAGAIN:
|
---|
| 157 | # endif
|
---|
| 158 | /* No error, try again */
|
---|
| 159 | break;
|
---|
| 160 | default:
|
---|
| 161 | ret = -1;
|
---|
| 162 | goto err; /* failure */
|
---|
| 163 | }
|
---|
| 164 | }
|
---|
| 165 | }
|
---|
| 166 | numbytes = 0;
|
---|
| 167 | while (numbytes != 1) {
|
---|
| 168 | num = read(fd, egdbuf, 1);
|
---|
| 169 | if (num == 0)
|
---|
| 170 | goto err; /* descriptor closed */
|
---|
| 171 | else if (num > 0)
|
---|
| 172 | numbytes += num;
|
---|
| 173 | else {
|
---|
| 174 | switch (errno) {
|
---|
| 175 | # ifdef EINTR
|
---|
| 176 | case EINTR:
|
---|
| 177 | # endif
|
---|
| 178 | # ifdef EAGAIN
|
---|
| 179 | case EAGAIN:
|
---|
| 180 | # endif
|
---|
| 181 | /* No error, try again */
|
---|
| 182 | break;
|
---|
| 183 | default:
|
---|
| 184 | ret = -1;
|
---|
| 185 | goto err; /* failure */
|
---|
| 186 | }
|
---|
| 187 | }
|
---|
| 188 | }
|
---|
| 189 | if (egdbuf[0] == 0)
|
---|
| 190 | goto err;
|
---|
| 191 | if (buf)
|
---|
| 192 | retrievebuf = buf + ret;
|
---|
| 193 | else
|
---|
| 194 | retrievebuf = tempbuf;
|
---|
| 195 | numbytes = 0;
|
---|
| 196 | while (numbytes != egdbuf[0]) {
|
---|
| 197 | num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
|
---|
| 198 | if (num == 0)
|
---|
| 199 | goto err; /* descriptor closed */
|
---|
| 200 | else if (num > 0)
|
---|
| 201 | numbytes += num;
|
---|
| 202 | else {
|
---|
| 203 | switch (errno) {
|
---|
| 204 | # ifdef EINTR
|
---|
| 205 | case EINTR:
|
---|
| 206 | # endif
|
---|
| 207 | # ifdef EAGAIN
|
---|
| 208 | case EAGAIN:
|
---|
| 209 | # endif
|
---|
| 210 | /* No error, try again */
|
---|
| 211 | break;
|
---|
| 212 | default:
|
---|
| 213 | ret = -1;
|
---|
| 214 | goto err; /* failure */
|
---|
| 215 | }
|
---|
| 216 | }
|
---|
| 217 | }
|
---|
| 218 | ret += egdbuf[0];
|
---|
| 219 | bytes -= egdbuf[0];
|
---|
| 220 | if (!buf)
|
---|
| 221 | RAND_seed(tempbuf, egdbuf[0]);
|
---|
| 222 | }
|
---|
| 223 | err:
|
---|
| 224 | if (fd != -1)
|
---|
| 225 | close(fd);
|
---|
| 226 | return (ret);
|
---|
| 227 | }
|
---|
| 228 |
|
---|
| 229 | int RAND_egd_bytes(const char *path, int bytes)
|
---|
| 230 | {
|
---|
| 231 | int num, ret = -1;
|
---|
| 232 |
|
---|
| 233 | num = RAND_query_egd_bytes(path, NULL, bytes);
|
---|
| 234 | if (num < 0)
|
---|
| 235 | goto err;
|
---|
| 236 | if (RAND_status() == 1)
|
---|
| 237 | ret = num;
|
---|
| 238 | err:
|
---|
| 239 | return (ret);
|
---|
| 240 | }
|
---|
| 241 |
|
---|
| 242 | int RAND_egd(const char *path)
|
---|
| 243 | {
|
---|
| 244 | return (RAND_egd_bytes(path, 255));
|
---|
| 245 | }
|
---|
| 246 |
|
---|
| 247 | # endif
|
---|
| 248 |
|
---|
| 249 | #endif
|
---|