1/* 2 * Copyright (c) 2010 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Portions Copyright (c) 2010 Apple Inc. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <config.h> 37 38#include <sys/types.h> 39#include <fcntl.h> 40#include <errno.h> 41#include <unistd.h> 42 43#include <krb5-types.h> 44 45#include "roken.h" 46 47#include <CommonCrypto/CommonCryptor.h> 48#include "CCDGlue.h" 49 50static int 51_hc_unix_device_fd(int flags, const char **fn) 52{ 53 static const char *rnd_devices[] = { 54 "/dev/urandom", 55 "/dev/random", 56 "/dev/srandom", 57 "/dev/arandom", 58 NULL 59 }; 60 const char **p; 61 62 for(p = rnd_devices; *p; p++) { 63 int fd = open(*p, flags | O_NDELAY); 64 if(fd >= 0) { 65 if (fn) 66 *fn = *p; 67 rk_cloexec(fd); 68 return fd; 69 } 70 } 71 return -1; 72} 73 74int 75CCRandomCopyBytes(CCRandomRef source, void *data, size_t size) 76{ 77 uint8_t *outdata = data; 78 ssize_t count; 79 int fd; 80 81 if (size == 0) 82 return 0; 83 84 fd = _hc_unix_device_fd(O_RDONLY, NULL); 85 if (fd < 0) 86 return EINVAL; 87 88 while (size > 0) { 89 count = read(fd, outdata, size); 90 if (count < 0 && errno == EINTR) 91 continue; 92 else if (count <= 0) { 93 close(fd); 94 return EINVAL; 95 } 96 outdata += count; 97 size -= count; 98 } 99 close(fd); 100 101 return 1; 102} 103