diff -up openssh-5.8p2/entropy.c.entropy openssh-5.8p2/entropy.c
--- openssh-5.8p2/entropy.c.entropy 2011-05-03 02:00:08.000000000 +0200
+++ openssh-5.8p2/entropy.c 2011-05-28 21:13:09.302866730 +0200
@@ -145,6 +145,9 @@ seed_rng(void)
memset(buf, '\0', sizeof(buf));
#endif /* OPENSSL_PRNG_ONLY */
+#ifdef __linux__
+ linux_seed();
+#endif /* __linux__ */
if (RAND_status() != 1)
fatal("PRNG is not seeded");
}
diff -up openssh-5.8p2/openbsd-compat/Makefile.in.entropy openssh-5.8p2/openbsd-compat/Makefile.in
--- openssh-5.8p2/openbsd-compat/Makefile.in.entropy 2010-10-07 13:19:24.000000000 +0200
+++ openssh-5.8p2/openbsd-compat/Makefile.in 2011-05-28 21:13:09.449924419 +0200
@@ -20,7 +20,7 @@ OPENBSD=base64.o basename.o bindresvport
COMPAT=bsd-arc4random.o bsd-asprintf.o bsd-closefrom.o bsd-cray.o bsd-cygwin_util.o bsd-getpeereid.o bsd-misc.o bsd-nextstep.o bsd-openpty.o bsd-poll.o bsd-snprintf.o bsd-statvfs.o bsd-waitpid.o fake-rfc2553.o openssl-compat.o xmmap.o xcrypt.o
-PORTS=port-aix.o port-irix.o port-linux.o port-solaris.o port-tun.o port-uw.o
+PORTS=port-aix.o port-irix.o port-linux.o port-linux-prng.o port-solaris.o port-tun.o port-uw.o
.c.o:
$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
diff -up openssh-5.8p2/openbsd-compat/port-linux-prng.c.entropy openssh-5.8p2/openbsd-compat/port-linux-prng.c
--- openssh-5.8p2/openbsd-compat/port-linux-prng.c.entropy 2011-05-28 21:13:09.540878930 +0200
+++ openssh-5.8p2/openbsd-compat/port-linux-prng.c 2011-05-28 21:13:09.547919624 +0200
@@ -0,0 +1,59 @@
+/* $Id: port-linux.c,v 1.11.4.2 2011/02/04 00:43:08 djm Exp $ */
+
+/*
+ * Copyright (c) 2011 Jan F. Chadima <jchadima@redhat.com>
+ *
+ * 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.
+ */
+
+/*
+ * Linux-specific portability code - prng support
+ */
+
+#include "includes.h"
+
+#include <errno.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+#include <openssl/rand.h>
+
+#include "log.h"
+#include "xmalloc.h"
+#include "servconf.h"
+#include "port-linux.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
+
+void
+linux_seed(void)
+{
+ int len;
+ char *env = getenv("SSH_USE_STRONG_RNG");
+ char *random = "/dev/random";
+ size_t ienv, randlen = 6;
+
+ if (!env || !strcmp(env, "0"))
+ random = "/dev/urandom";
+ else if ((ienv = atoi(env)) > 6)
+ randlen = ienv;
+
+ errno = 0;
+ if ((len = RAND_load_file(random, randlen)) != randlen) {
+ if (errno)
+ fatal ("cannot read from %s, %s", random, strerror(errno));
+ else
+ fatal ("EOF reading %s", random);
+ }
+}
diff -up openssh-5.8p2/ssh.1.entropy openssh-5.8p2/ssh.1
--- openssh-5.8p2/ssh.1.entropy 2010-11-20 05:21:03.000000000 +0100
+++ openssh-5.8p2/ssh.1 2011-05-28 21:15:27.375920967 +0200
@@ -1250,6 +1250,20 @@ For more information, see the
.Cm PermitUserEnvironment
option in
.Xr sshd_config 5 .
+.It Ev SSH_USE_STRONG_RNG
+The reseeding of the OpenSSL random generator is usually done from
+.Cm /dev/urandom .
+If the
+.Cm SSH_USE_STRONG_RNG
+environment variable is set to value other than
+.Cm 0
+the OpenSSL random generator is reseeded from
+.Cm /dev/random .
+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.
+Minimum is 6 bytes.
+This setting is not recommended on the computers without the hardware
+random generator because insufficient entropy causes the connection to
+be blocked until enough entropy is available.
.Sh FILES
.Bl -tag -width Ds -compact
.It Pa ~/.rhosts
diff -up openssh-5.8p2/ssh-add.1.entropy openssh-5.8p2/ssh-add.1
--- openssh-5.8p2/ssh-add.1.entropy 2010-11-05 00:20:14.000000000 +0100
+++ openssh-5.8p2/ssh-add.1 2011-05-28 21:16:43.891859186 +0200
@@ -158,6 +158,20 @@ Identifies the path of a
.Ux Ns -domain
socket used to communicate with the agent.
.El
+.It Ev SSH_USE_STRONG_RNG
+The reseeding of the OpenSSL random generator is usually done from
+.Cm /dev/urandom .
+If the
+.Cm SSH_USE_STRONG_RNG
+environment variable is set to value other than
+.Cm 0
+the OpenSSL random generator is reseeded from
+.Cm /dev/random .
+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.
+Minimum is 6 bytes.
+This setting is not recommended on the computers without the hardware
+random generator because insufficient entropy causes the connection to
+be blocked until enough entropy is available.
.Sh FILES
.Bl -tag -width Ds
.It Pa ~/.ssh/identity
diff -up openssh-5.8p2/ssh-agent.1.entropy openssh-5.8p2/ssh-agent.1
--- openssh-5.8p2/ssh-agent.1.entropy 2010-12-01 01:50:35.000000000 +0100
+++ openssh-5.8p2/ssh-agent.1 2011-05-28 21:13:10.086864993 +0200
@@ -198,6 +198,23 @@ sockets used to contain the connection t
These sockets should only be readable by the owner.
The sockets should get automatically removed when the agent exits.
.El
+.Sh ENVIRONMENT
+.Bl -tag -width Ds -compact
+.Pp
+.It Pa SSH_USE_STRONG_RNG
+The reseeding of the OpenSSL random generator is usually done from
+.Cm /dev/urandom .
+If the
+.Cm SSH_USE_STRONG_RNG
+environment variable is set to value other than
+.Cm 0
+the OpenSSL random generator is reseeded from
+.Cm /dev/random .
+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.
+Minimum is 6 bytes.
+This setting is not recommended on the computers without the hardware
+random generator because insufficient entropy causes the connection to
+be blocked until enough entropy is available.
.Sh SEE ALSO
.Xr ssh 1 ,
.Xr ssh-add 1 ,
diff -up openssh-5.8p2/sshd.8.entropy openssh-5.8p2/sshd.8
--- openssh-5.8p2/sshd.8.entropy 2010-11-05 00:20:14.000000000 +0100
+++ openssh-5.8p2/sshd.8 2011-05-28 21:13:10.241861760 +0200
@@ -937,6 +937,23 @@ concurrently for different ports, this c
started last).
The content of this file is not sensitive; it can be world-readable.
.El
+.Sh ENVIRONMENT
+.Bl -tag -width Ds -compact
+.Pp
+.It Pa SSH_USE_STRONG_RNG
+The reseeding of the OpenSSL random generator is usually done from
+.Cm /dev/urandom .
+If the
+.Cm SSH_USE_STRONG_RNG
+environment variable is set to value other than
+.Cm 0
+the OpenSSL random generator is reseeded from
+.Cm /dev/random .
+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.
+Minimum is 6 bytes.
+This setting is not recommended on the computers without the hardware
+random generator because insufficient entropy causes the connection to
+be blocked until enough entropy is available.
.Sh SEE ALSO
.Xr scp 1 ,
.Xr sftp 1 ,
diff -up openssh-5.8p2/ssh-keygen.1.entropy openssh-5.8p2/ssh-keygen.1
--- openssh-5.8p2/ssh-keygen.1.entropy 2010-11-05 00:20:14.000000000 +0100
+++ openssh-5.8p2/ssh-keygen.1 2011-05-28 21:13:10.389856432 +0200
@@ -655,6 +655,23 @@ Contains Diffie-Hellman groups used for
The file format is described in
.Xr moduli 5 .
.El
+.Sh ENVIRONMENT
+.Bl -tag -width Ds -compact
+.Pp
+.It Pa SSH_USE_STRONG_RNG
+The reseeding of the OpenSSL random generator is usually done from
+.Cm /dev/urandom .
+If the
+.Cm SSH_USE_STRONG_RNG
+environment variable is set to value other than
+.Cm 0
+the OpenSSL random generator is reseeded from
+.Cm /dev/random .
+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.
+Minimum is 6 bytes.
+This setting is not recommended on the computers without the hardware
+random generator because insufficient entropy causes the connection to
+be blocked until enough entropy is available.
.Sh SEE ALSO
.Xr ssh 1 ,
.Xr ssh-add 1 ,
diff -up openssh-5.8p2/ssh-keysign.8.entropy openssh-5.8p2/ssh-keysign.8
--- openssh-5.8p2/ssh-keysign.8.entropy 2010-08-31 14:41:14.000000000 +0200
+++ openssh-5.8p2/ssh-keysign.8 2011-05-28 21:17:32.399856797 +0200
@@ -78,6 +78,23 @@ must be set-uid root if host-based authe
If these files exist they are assumed to contain public certificate
information corresponding with the private keys above.
.El
+.Sh ENVIRONMENT
+.Bl -tag -width Ds -compact
+.Pp
+.It Pa SSH_USE_STRONG_RNG
+The reseeding of the OpenSSL random generator is usually done from
+.Cm /dev/urandom .
+If the
+.Cm SSH_USE_STRONG_RNG
+environment variable is set to value other than
+.Cm 0
+the OpenSSL random generator is reseeded from
+.Cm /dev/random .
+The number of bytes read is defined by the SSH_USE_STRONG_RNG value.
+Minimum is 6 bytes.
+This setting is not recommended on the computers without the hardware
+random generator because insufficient entropy causes the connection to
+be blocked until enough entropy is available.
.Sh SEE ALSO
.Xr ssh 1 ,
.Xr ssh-keygen 1 ,