openssh/openssh-6.6p1-entropy.patch

diff --git a/entropy.c b/entropy.c
index 1e9d52a..d24e724 100644
--- a/entropy.c
+++ b/entropy.c
@@ -227,6 +227,9 @@ 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 --git a/openbsd-compat/Makefile.in b/openbsd-compat/Makefile.in
index 843225d..041bbab 100644
--- a/openbsd-compat/Makefile.in
+++ b/openbsd-compat/Makefile.in
@@ -20,7 +20,7 @@ OPENBSD=base64.o basename.o bcrypt_pbkdf.o bindresvport.o blowfish.o daemon.o di
 
 COMPAT=arc4random.o bsd-asprintf.o bsd-closefrom.o bsd-cray.o bsd-cygwin_util.o bsd-getpeereid.o getrrsetbyname-ldns.o bsd-misc.o bsd-nextstep.o bsd-openpty.o bsd-poll.o bsd-setres_id.o bsd-snprintf.o bsd-statvfs.o bsd-waitpid.o fake-rfc2553.o openssl-compat.o xmmap.o xcrypt.o kludge-fd_set.o
 
-PORTS=port-aix.o port-irix.o port-linux.o port-linux-sshd.o port-solaris.o port-tun.o port-uw.o
+PORTS=port-aix.o port-irix.o port-linux.o port-linux-sshd.o port-linux-prng.o port-solaris.o port-tun.o port-uw.o
 
 .c.o:
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
diff --git a/openbsd-compat/port-linux-prng.c b/openbsd-compat/port-linux-prng.c
new file mode 100644
index 0000000..da84bf2
--- /dev/null
+++ b/openbsd-compat/port-linux-prng.c
@@ -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 "misc.h"      /* servconf.h needs misc.h for struct ForwardOptions */
+#include "servconf.h"
+#include "port-linux.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
+
+void
+linux_seed(void)
+{
+	char *env = getenv("SSH_USE_STRONG_RNG");
+	char *random = "/dev/random";
+	size_t len, ienv, randlen = 14;
+
+	if (!env || !strcmp(env, "0"))
+		random = "/dev/urandom";
+	else if ((ienv = atoi(env)) > randlen)
+		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 --git a/ssh-add.0 b/ssh-add.0
index f16165a..17d22cf 100644
--- a/ssh-add.0
+++ b/ssh-add.0
@@ -82,6 +82,16 @@ ENVIRONMENT
              Identifies the path of a UNIX-domain socket used to communicate
              with the agent.
 
+     SSH_USE_STRONG_RNG
+             The reseeding of the OpenSSL random generator is usually done
+             from /dev/urandom.  If the SSH_USE_STRONG_RNG environment vari-
+             able is set to value other than 0 the OpenSSL random generator is
+             reseeded from /dev/random.  The number of bytes read is defined
+             by the SSH_USE_STRONG_RNG value.  Minimum is 14 bytes.  This set-
+             ting is not recommended on the computers without the hardware
+             random generator because insufficient entropy causes the connec-
+             tion to be blocked until enough entropy is available.
+
 FILES
      ~/.ssh/identity
              Contains the protocol version 1 RSA authentication identity of
diff --git a/ssh-add.1 b/ssh-add.1
index 04d1840..db883a4 100644
--- a/ssh-add.1
+++ b/ssh-add.1
@@ -170,6 +170,20 @@ to make this work.)
 Identifies the path of a
 .Ux Ns -domain
 socket used to communicate with the agent.
+.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 14 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.
 .El
 .Sh FILES
 .Bl -tag -width Ds
diff --git a/ssh-agent.1 b/ssh-agent.1
index d7e791b..7332f0d 100644
--- a/ssh-agent.1
+++ b/ssh-agent.1
@@ -189,6 +189,24 @@ sockets used to contain the connection to the authentication agent.
 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 14 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.
+.El
 .Sh SEE ALSO
 .Xr ssh 1 ,
 .Xr ssh-add 1 ,
diff --git a/ssh-keygen.1 b/ssh-keygen.1
index 276dacc..a09d9b1 100644
--- a/ssh-keygen.1
+++ b/ssh-keygen.1
@@ -841,6 +841,24 @@ Contains Diffie-Hellman groups used for DH-GEX.
 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 14 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.
+.El
 .Sh SEE ALSO
 .Xr ssh 1 ,
 .Xr ssh-add 1 ,
diff --git a/ssh-keysign.8 b/ssh-keysign.8
index 69d0829..02d79f8 100644
--- a/ssh-keysign.8
+++ b/ssh-keysign.8
@@ -80,6 +80,24 @@ must be set-uid root if host-based authentication is used.
 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 14 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.
+.El
 .Sh SEE ALSO
 .Xr ssh 1 ,
 .Xr ssh-keygen 1 ,
diff --git a/ssh.1 b/ssh.1
index 4a476c2..410a04a 100644
--- a/ssh.1
+++ b/ssh.1
@@ -1299,6 +1299,23 @@ For more information, see the
 .Cm PermitUserEnvironment
 option in
 .Xr sshd_config 5 .
+.Sh ENVIRONMENT
+.Bl -tag -width Ds -compact
+.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 14 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.
+.El
 .Sh FILES
 .Bl -tag -width Ds -compact
 .It Pa ~/.rhosts
diff --git a/sshd.8 b/sshd.8
index cb866b5..adcaaf9 100644
--- a/sshd.8
+++ b/sshd.8
@@ -945,6 +945,24 @@ concurrently for different ports, this contains the process ID of the one
 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 14 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.
+.El
 .Sh IPV6
 IPv6 address can be used everywhere where IPv4 address. In all entries must be the IPv6 address enclosed in square brackets. Note: The square brackets are metacharacters for the shell and must be escaped in shell.
 .Sh SEE ALSO