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SUSE:SLE-12-SP5:Update
openssh.32839
openssh-7.2p2-seed-prng.patch
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File openssh-7.2p2-seed-prng.patch of Package openssh.32839
From f0cecf263004f2ee4acadf72345c7cc9e5b20afa Mon Sep 17 00:00:00 2001 From: Old openssh patches <pcerny@suse.com> Date: Wed, 26 Oct 2022 09:50:38 +0200 Subject: [PATCH] openssh-7.2p2-seed-prng # HG changeset patch # Parent 84a8ae72aaf1527a30b037965dce9dfe4c517c29 # extended support for (re-)seeding the OpenSSL PRNG from /dev/random # bnc#703221, FATE#312172 --- entropy.c | 4 ++ openbsd-compat/Makefile.in | 2 +- openbsd-compat/port-linux-prng.c | 81 ++++++++++++++++++++++++++++++++ openbsd-compat/port-linux.h | 4 ++ ssh-add.1 | 14 ++++++ ssh-agent.1 | 17 +++++++ ssh-keygen.1 | 17 +++++++ ssh-keysign.8 | 17 +++++++ ssh.1 | 14 ++++++ sshd.8 | 17 +++++++ sshd.c | 13 +++++ 11 files changed, 199 insertions(+), 1 deletion(-) create mode 100644 openbsd-compat/port-linux-prng.c diff --git a/entropy.c b/entropy.c index 9305f89a..a373325c 100644 --- a/entropy.c +++ b/entropy.c @@ -54,6 +54,7 @@ #include "pathnames.h" #include "log.h" #include "buffer.h" +#include "openbsd-compat/port-linux.h" /* * Portable OpenSSH PRNG seeding: @@ -229,6 +230,9 @@ seed_rng(void) memset(buf, '\0', sizeof(buf)); #endif /* OPENSSL_PRNG_ONLY */ + + linux_seed(); + if (RAND_status() != 1) fatal("PRNG is not seeded"); } diff --git a/openbsd-compat/Makefile.in b/openbsd-compat/Makefile.in index 3c5e3b7f..b4e0da8f 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-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 --git a/openbsd-compat/port-linux-prng.c b/openbsd-compat/port-linux-prng.c new file mode 100644 index 00000000..dfc4bdba --- /dev/null +++ b/openbsd-compat/port-linux-prng.c @@ -0,0 +1,81 @@ +/* + * Copyright (c) 2011 Jan F. Chadima <jchadima@redhat.com> + * (c) 2011 Petr Cerny <pcerny@suse.cz> + * + * 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 "defines.h" + +#include <errno.h> +#include <stdarg.h> +#include <string.h> +#include <stdio.h> +#include <openssl/rand.h> + +#include "log.h" +#include "port-linux.h" +#include "fips.h" + +#define RNG_BYTES_DEFAULT 6L +#define RNG_ENV_VAR "SSH_USE_STRONG_RNG" + +long rand_bytes = 0; +char *rand_file = NULL; + +static void +linux_seed_init(void) +{ + long elen = 0; + char *env = getenv(RNG_ENV_VAR); + + if (env) { + errno = 0; + elen = strtol(env, NULL, 10); + if (errno) { + elen = RNG_BYTES_DEFAULT; + debug("bogus value in the %s environment variable, " + "using %li bytes from /dev/random\n", + RNG_ENV_VAR, RNG_BYTES_DEFAULT); + } + } + + if (elen || fips_mode()) + rand_file = "/dev/random"; + else + rand_file = "/dev/urandom"; + + rand_bytes = MAX(elen, RNG_BYTES_DEFAULT); +} + +void +linux_seed(void) +{ + long len; + if (!rand_file) + linux_seed_init(); + + errno = 0; + len = RAND_load_file(rand_file, rand_bytes); + if (len != rand_bytes) { + if (errno) + fatal ("cannot read from %s, %s", rand_file, strerror(errno)); + else + fatal ("EOF reading %s", rand_file); + } +} diff --git a/openbsd-compat/port-linux.h b/openbsd-compat/port-linux.h index e3d1004a..e4ebffc5 100644 --- a/openbsd-compat/port-linux.h +++ b/openbsd-compat/port-linux.h @@ -19,6 +19,10 @@ #ifndef _PORT_LINUX_H #define _PORT_LINUX_H +extern long rand_bytes; +extern char *rand_file; +void linux_seed(void); + #ifdef WITH_SELINUX int ssh_selinux_enabled(void); void ssh_selinux_setup_pty(char *, const char *); diff --git a/ssh-add.1 b/ssh-add.1 index f02b595d..316e225e 100644 --- a/ssh-add.1 +++ b/ssh-add.1 @@ -171,6 +171,20 @@ 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 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. .El .Sh FILES .Bl -tag -width Ds diff --git a/ssh-agent.1 b/ssh-agent.1 index c4b50bbd..814c8639 100644 --- a/ssh-agent.1 +++ b/ssh-agent.1 @@ -201,6 +201,23 @@ 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 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 --git a/ssh-keygen.1 b/ssh-keygen.1 index 37a4fc2b..46941fd1 100644 --- a/ssh-keygen.1 +++ b/ssh-keygen.1 @@ -846,6 +846,23 @@ 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 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 --git a/ssh-keysign.8 b/ssh-keysign.8 index 19b0dbc5..639b56ee 100644 --- a/ssh-keysign.8 +++ b/ssh-keysign.8 @@ -80,6 +80,23 @@ 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 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 , diff --git a/ssh.1 b/ssh.1 index cc533433..7ce39a3f 100644 --- a/ssh.1 +++ b/ssh.1 @@ -1416,6 +1416,20 @@ 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 --git a/sshd.8 b/sshd.8 index cf27e826..dce962e9 100644 --- a/sshd.8 +++ b/sshd.8 @@ -977,6 +977,23 @@ 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 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 --git a/sshd.c b/sshd.c index 73c5ec1a..8d3a42d9 100644 --- a/sshd.c +++ b/sshd.c @@ -55,6 +55,8 @@ #endif #include "openbsd-compat/sys-tree.h" #include "openbsd-compat/sys-queue.h" +#include "openbsd-compat/port-linux.h" + #include <sys/wait.h> #include <errno.h> @@ -213,6 +215,13 @@ struct { u_char ssh1_cookie[SSH_SESSION_KEY_LENGTH]; } sensitive_data; +/* + * Every RESEED_AFTERth connection triggers call to linux_seed() to re-seed the + * random pool. + */ +#define RESEED_AFTER 100 +static int re_seeding_counter = RESEED_AFTER; + /* * Flag indicating whether the RSA server key needs to be regenerated. * Is set in the SIGALRM handler and cleared when the key is regenerated. @@ -1348,6 +1357,10 @@ server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s) startups++; break; } + if(!(--re_seeding_counter)) { + re_seeding_counter = RESEED_AFTER; + linux_seed(); + } /* * Got connection. Fork a child to handle it, unless -- 2.38.0
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