diff options
Diffstat (limited to 'crypto/openssh/openbsd-compat/arc4random.h')
-rw-r--r-- | crypto/openssh/openbsd-compat/arc4random.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/crypto/openssh/openbsd-compat/arc4random.h b/crypto/openssh/openbsd-compat/arc4random.h new file mode 100644 index 000000000000..2b57611f060c --- /dev/null +++ b/crypto/openssh/openbsd-compat/arc4random.h @@ -0,0 +1,79 @@ +/* $OpenBSD: arc4random_linux.h,v 1.12 2019/07/11 10:37:28 inoguchi Exp $ */ + +/* + * Copyright (c) 1996, David Mazieres <dm@uun.org> + * Copyright (c) 2008, Damien Miller <djm@openbsd.org> + * Copyright (c) 2013, Markus Friedl <markus@openbsd.org> + * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * Stub functions for portability. From LibreSSL with some adaptations. + */ + +#include <sys/mman.h> + +#include <signal.h> + +/* OpenSSH isn't multithreaded */ +#define _ARC4_LOCK() +#define _ARC4_UNLOCK() +#define _ARC4_ATFORK(f) + +static inline void +_getentropy_fail(void) +{ + fatal("getentropy failed"); +} + +static volatile sig_atomic_t _rs_forked; + +static inline void +_rs_forkhandler(void) +{ + _rs_forked = 1; +} + +static inline void +_rs_forkdetect(void) +{ + static pid_t _rs_pid = 0; + pid_t pid = getpid(); + + if (_rs_pid == 0 || _rs_pid == 1 || _rs_pid != pid || _rs_forked) { + _rs_pid = pid; + _rs_forked = 0; + if (rs) + memset(rs, 0, sizeof(*rs)); + } +} + +static inline int +_rs_allocate(struct _rs **rsp, struct _rsx **rsxp) +{ + if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE, + MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) + return (-1); + + if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE, + MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) { + munmap(*rsp, sizeof(**rsp)); + *rsp = NULL; + return (-1); + } + + _ARC4_ATFORK(_rs_forkhandler); + return (0); +} |