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openssh.17528
openssh-7.7p1-seed-prng.patch
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File openssh-7.7p1-seed-prng.patch of Package openssh.17528
# HG changeset patch # Parent e655fcb8e89d19ce9e954d6fc330e5e3e093a848 # extended support for (re-)seeding the OpenSSL PRNG from /dev/random # bnc#703221, FATE#312172 diff --git a/Makefile.in b/Makefile.in index 85818f4..750aada 100644 --- a/Makefile.in +++ b/Makefile.in @@ -182,13 +182,13 @@ libssh.a: $(LIBSSH_OBJS) $(RANLIB) $@ ssh$(EXEEXT): $(LIBCOMPAT) libssh.a $(SSHOBJS) - $(LD) -o $@ $(SSHOBJS) $(LDFLAGS) -lssh -lopenbsd-compat $(SSHLIBS) $(LIBS) $(GSSLIBS) + $(LD) -o $@ $(SSHOBJS) $(LDFLAGS) -lssh -lopenbsd-compat -lssh $(SSHLIBS) $(LIBS) $(GSSLIBS) sshd$(EXEEXT): libssh.a $(LIBCOMPAT) $(SSHDOBJS) - $(LD) -o $@ $(SSHDOBJS) $(LDFLAGS) -lssh -lopenbsd-compat $(SSHDLIBS) $(LIBS) $(GSSLIBS) $(K5LIBS) + $(LD) -o $@ $(SSHDOBJS) $(LDFLAGS) -lssh -lopenbsd-compat -lssh $(SSHDLIBS) $(LIBS) $(GSSLIBS) $(K5LIBS) scp$(EXEEXT): $(LIBCOMPAT) libssh.a scp.o progressmeter.o - $(LD) -o $@ scp.o progressmeter.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) + $(LD) -o $@ scp.o progressmeter.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lopenbsd-compat $(LIBS) ssh-add$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-add.o $(LD) -o $@ ssh-add.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) @@ -197,10 +197,10 @@ ssh-agent$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-agent.o ssh-pkcs11-client.o $(LD) -o $@ ssh-agent.o ssh-pkcs11-client.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) ssh-keygen$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-keygen.o sshsig.o - $(LD) -o $@ ssh-keygen.o sshsig.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) + $(LD) -o $@ ssh-keygen.o sshsig.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lopenbsd-compat $(LIBS) ssh-keysign$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-keysign.o readconf.o uidswap.o compat.o - $(LD) -o $@ ssh-keysign.o readconf.o uidswap.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) + $(LD) -o $@ ssh-keysign.o readconf.o uidswap.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh $(LIBS) ssh-pkcs11-helper$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-pkcs11-helper.o ssh-pkcs11.o $(LD) -o $@ ssh-pkcs11-helper.o ssh-pkcs11.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lopenbsd-compat $(LIBS) @@ -209,10 +209,10 @@ ssh-keyscan$(EXEEXT): $(LIBCOMPAT) libssh.a ssh-keyscan.o $(LD) -o $@ ssh-keyscan.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh $(LIBS) sftp-server$(EXEEXT): $(LIBCOMPAT) libssh.a sftp.o sftp-common.o sftp-server.o sftp-realpath.o sftp-server-main.o - $(LD) -o $@ sftp-server.o sftp-common.o sftp-realpath.o sftp-server-main.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) + $(LD) -o $@ sftp-server.o sftp-common.o sftp-realpath.o sftp-server-main.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lopenbsd-compat $(LIBS) sftp$(EXEEXT): $(LIBCOMPAT) libssh.a sftp.o sftp-client.o sftp-common.o sftp-glob.o progressmeter.o - $(LD) -o $@ progressmeter.o sftp.o sftp-client.o sftp-common.o sftp-glob.o $(LDFLAGS) -lssh -lopenbsd-compat $(LIBS) $(LIBEDIT) + $(LD) -o $@ progressmeter.o sftp.o sftp-client.o sftp-common.o sftp-glob.o $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lopenbsd-compat $(LIBS) $(LIBEDIT) # FIPS tests cavstest-ctr$(EXEEXT): $(LIBCOMPAT) libssh.a cavstest-ctr.o diff --git a/entropy.c b/entropy.c index 5de6801..f8b9f42 100644 --- a/entropy.c +++ b/entropy.c @@ -239,6 +239,8 @@ seed_rng(void) } #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 1162dc5..80fd688 100644 --- a/openbsd-compat/Makefile.in +++ b/openbsd-compat/Makefile.in @@ -91,6 +91,7 @@ COMPAT= arc4random.o \ PORTS= port-aix.o \ port-irix.o \ port-linux.o \ + port-linux-prng.o \ port-solaris.o \ port-net.o \ port-uw.o diff --git a/openbsd-compat/port-linux-prng.c b/openbsd-compat/port-linux-prng.c new file mode 100644 index 0000000..dfc4bdb --- /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 3c22a85..2dc1fd0 100644 --- a/openbsd-compat/port-linux.h +++ b/openbsd-compat/port-linux.h @@ -17,6 +17,10 @@ #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 d4e1c60..6f76900 100644 --- a/ssh-add.1 +++ b/ssh-add.1 @@ -189,6 +189,20 @@ 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 83b2b41..9e187f2 100644 --- a/ssh-agent.1 +++ b/ssh-agent.1 @@ -214,6 +214,23 @@ 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 957d2f0..70c4a28 100644 --- a/ssh-keygen.1 +++ b/ssh-keygen.1 @@ -1054,6 +1054,23 @@ 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 19b0dbc..639b56e 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 424d6c3..899a339 100644 --- a/ssh.1 +++ b/ssh.1 @@ -1433,6 +1433,20 @@ 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 fb133c1..2f1d3ab 100644 --- a/sshd.8 +++ b/sshd.8 @@ -966,6 +966,23 @@ 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 bb20eec..c562094 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> @@ -205,6 +207,13 @@ struct { int have_ssh2_key; } 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; + /* This is set to true when a signal is received. */ static volatile sig_atomic_t received_sighup = 0; static volatile sig_atomic_t received_sigterm = 0; @@ -1201,6 +1210,10 @@ server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s) startup_flags[j] = 1; break; } + if(!(--re_seeding_counter)) { + re_seeding_counter = RESEED_AFTER; + linux_seed(); + } /* * Got connection. Fork a child to handle it, unless
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