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refuse to generate or accept RSA keys smaller than 1024
 bits; feedback and ok dtucker@

Upstream-ID: 7ea3d31271366ba264f06e34a3539bf1ac30f0ba
This commit is contained in:
djm@openbsd.org 2015-07-03 03:49:45 +00:00 committed by Damien Miller
parent bdfd29f60b
commit 933935ce8d
6 changed files with 21 additions and 24 deletions
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6
ssh-keygen.1
View File

@ -1,4 +1,4 @@
.\" $OpenBSD: ssh-keygen.1,v 1.125 2015/02/24 15:24:05 naddy Exp $
.\" $OpenBSD: ssh-keygen.1,v 1.126 2015/07/03 03:49:45 djm Exp $
.\"
.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -35,7 +35,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: February 24 2015 $
.Dd $Mdocdate: July 3 2015 $
.Dt SSH-KEYGEN 1
.Os
.Sh NAME
@ -244,7 +244,7 @@ This option specifies the number of primality tests to perform.
Show the bubblebabble digest of specified private or public key file.
.It Fl b Ar bits
Specifies the number of bits in the key to create.
For RSA keys, the minimum size is 768 bits and the default is 2048 bits.
For RSA keys, the minimum size is 1024 bits and the default is 2048 bits.
Generally, 2048 bits is considered sufficient.
DSA keys must be exactly 1024 bits as specified by FIPS 186-2.
For ECDSA keys, the

6
ssh-keygen.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keygen.c,v 1.275 2015/07/03 03:43:18 djm Exp $ */
/* $OpenBSD: ssh-keygen.c,v 1.276 2015/07/03 03:49:45 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -217,8 +217,8 @@ type_bits_valid(int type, const char *name, u_int32_t *bitsp)
fatal("key bits exceeds maximum %d", maxbits);
if (type == KEY_DSA && *bitsp != 1024)
fatal("DSA keys must be 1024 bits");
else if (type != KEY_ECDSA && type != KEY_ED25519 && *bitsp < 768)
fatal("Key must at least be 768 bits");
else if (type != KEY_ECDSA && type != KEY_ED25519 && *bitsp < 1024)
fatal("Key must at least be 1024 bits");
else if (type == KEY_ECDSA && sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
fatal("Invalid ECDSA key length - valid lengths are "
"256, 384 or 521 bits");

4
ssh.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh.h,v 1.79 2010/06/25 07:14:46 djm Exp $ */
/* $OpenBSD: ssh.h,v 1.80 2015/07/03 03:49:45 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@ -93,7 +93,7 @@
#endif
/* Minimum modulus size (n) for RSA keys. */
#define SSH_RSA_MINIMUM_MODULUS_SIZE 768
#define SSH_RSA_MINIMUM_MODULUS_SIZE 1024
/* Listen backlog for sshd, ssh-agent and forwarding sockets */
#define SSH_LISTEN_BACKLOG 128

17
sshd.8
View File

@ -33,8 +33,8 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $OpenBSD: sshd.8,v 1.279 2015/05/01 07:11:47 djm Exp $
.Dd $Mdocdate: May 1 2015 $
.\" $OpenBSD: sshd.8,v 1.280 2015/07/03 03:49:45 djm Exp $
.Dd $Mdocdate: July 3 2015 $
.Dt SSHD 8
.Os
.Sh NAME
@ -184,15 +184,12 @@ Specifies that
.Nm
is being run from
.Xr inetd 8 .
If SSH protocol 1 is enabled,
.Nm
is normally not run
should not normally be run
from inetd because it needs to generate the server key before it can
respond to the client, and this may take tens of seconds.
Clients would have to wait too long if the key was regenerated every time.
However, with small key sizes (e.g. 512) using
.Nm
from inetd may
be feasible.
respond to the client, and this may take some time.
Clients may have to wait too long if the key was regenerated every time.
.It Fl k Ar key_gen_time
Specifies how often the ephemeral protocol version 1 server key is
regenerated (default 3600 seconds, or one hour).
@ -287,7 +284,7 @@ used to identify the host.
.Pp
Forward security for protocol 1 is provided through
an additional server key,
normally 768 bits,
normally 1024 bits,
generated when the server starts.
This key is normally regenerated every hour if it has been used, and
is never stored on disk.

6
sshd.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sshd.c,v 1.452 2015/07/03 03:47:00 djm Exp $ */
/* $OpenBSD: sshd.c,v 1.453 2015/07/03 03:49:45 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1874,8 +1874,8 @@ main(int ac, char **av)
#ifdef WITH_SSH1
/* Check certain values for sanity. */
if (options.protocol & SSH_PROTO_1) {
if (options.server_key_bits < 512 ||
options.server_key_bits > 32768) {
if (options.server_key_bits < SSH_RSA_MINIMUM_MODULUS_SIZE ||
options.server_key_bits > OPENSSL_RSA_MAX_MODULUS_BITS) {
fprintf(stderr, "Bad server key size.\n");
exit(1);
}

6
sshd_config.5
View File

@ -33,8 +33,8 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $OpenBSD: sshd_config.5,v 1.204 2015/06/05 03:44:14 djm Exp $
.Dd $Mdocdate: June 5 2015 $
.\" $OpenBSD: sshd_config.5,v 1.205 2015/07/03 03:49:45 djm Exp $
.Dd $Mdocdate: July 3 2015 $
.Dt SSHD_CONFIG 5
.Os
.Sh NAME
@ -1343,7 +1343,7 @@ The default is
This option applies to protocol version 1 only.
.It Cm ServerKeyBits
Defines the number of bits in the ephemeral protocol version 1 server key.
The minimum value is 512, and the default is 1024.
The default and minimum value is 1024.
.It Cm StreamLocalBindMask
Sets the octal file creation mode mask
.Pq umask