125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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**
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** Random number collection
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**
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** Damien Miller <djm@ibs.com.au>
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**
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** Copyright 1999 Damien Miller
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**
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** Permission is hereby granted, free of charge, to any person
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** obtaining a copy of this software and associated documentation
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** files (the "Software"), to deal in the Software without
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** restriction, including without limitation the rights to use, copy,
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** modify, merge, publish, distribute, sublicense, and/or sell copies
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** of the Software, and to permit persons to whom the Software is
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** furnished to do so, subject to the following conditions:
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**
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** The above copyright notice and this permission notice shall be
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** included in all copies or substantial portions of the Software.
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**
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** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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** KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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** WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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** AND NONINFRINGEMENT. IN NO EVENT SHALL DAMIEN MILLER OR INTERNET
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** BUSINESS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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** OR OTHER DEALINGS IN THE SOFTWARE.
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**
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** Except as contained in this notice, the name of Internet Business
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** Solutions shall not be used in advertising or otherwise to promote
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** the sale, use or other dealings in this Software without prior
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** written authorization from Internet Business Solutions.
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**
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <fcntl.h>
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#ifdef HAVE_STDDEF_H
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#include <stddef.h>
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#endif
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#include "ssh.h"
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#include "xmalloc.h"
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#include "random.h"
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#ifndef offsetof
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# define offsetof(type, member) ((size_t) &((type *)0)->member)
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#endif
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#ifdef HAVE_EGD
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/* Collect entropy from EGD */
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void get_random_bytes(unsigned char *buf, int len)
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{
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static int random_pool;
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int c;
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char egd_message[2] = { 0x02, 0x00 };
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struct sockaddr_un addr;
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int addr_len;
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memset(&addr, '\0', sizeof(addr));
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addr.sun_family = AF_UNIX;
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/* FIXME: compile time check? */
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if (sizeof(RANDOM_POOL) > sizeof(addr.sun_path))
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fatal("Random pool path is too long");
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strcpy(addr.sun_path, RANDOM_POOL);
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addr_len = offsetof(struct sockaddr_un, sun_path) + sizeof(RANDOM_POOL);
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random_pool = socket(AF_UNIX, SOCK_STREAM, 0);
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if (random_pool == -1)
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fatal("Couldn't create AF_UNIX socket: %s", strerror(errno));
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if (connect(random_pool, (struct sockaddr*)&addr, addr_len) == -1)
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fatal("Couldn't connect to EGD socket \"%s\": %s", addr.sun_path, strerror(errno));
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if (len > 255)
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fatal("Too many bytes to read from EGD");
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/* Send blocking read request to EGD */
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egd_message[1] = len;
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c = atomicio(write, random_pool, egd_message, sizeof(egd_message));
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if (c == -1)
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fatal("Couldn't write to EGD socket \"%s\": %s", RANDOM_POOL, strerror(errno));
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c = atomicio(read, random_pool, buf, len);
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if (c <= 0)
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fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
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close(random_pool);
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}
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#else /* HAVE_EGD */
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/* Collect entropy from /dev/urandom or pipe */
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void get_random_bytes(unsigned char *buf, int len)
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{
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static int random_pool;
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int c;
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random_pool = open(RANDOM_POOL, O_RDONLY);
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if (random_pool == -1)
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fatal("Couldn't open random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
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c = atomicio(read, random_pool, buf, len);
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if (c <= 0)
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fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
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close(random_pool);
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}
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#endif /* HAVE_EGD */
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