[ptxdist] [PATCH 0/3] OpenSSH improvements

[ptxdist] [PATCH 0/3] OpenSSH improvements

[Clemens Gruber]

Hi,

I have three OpenSSH patches for ptxdist: Generating Ed25519 keys by
default (and no longer generating DSA keys by default), enabling the
privilege separation sandbox and bumping the version to 6.8p1

Best regards,
Clemens

Clemens Gruber (3):
  openssh: Generate Ed25519 keys instead of DSA keys
  openssh: Enable pre-auth sandboxing
  openssh: Bump to current stable version 6.8p1

 generic/etc/rc.once.d/openssh | 8 ++++----
 generic/etc/ssh/sshd_config   | 4 ++--
 rules/openssh.make            | 4 ++--
 3 files changed, 8 insertions(+), 8 deletions(-)

-- 
2.4.2


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[ptxdist] [PATCH 1/3] openssh: Generate Ed25519 keys instead of DSA keys

[Clemens Gruber]

As it is very likely that weak DSA and ECDSA keys are created on
embedded systems (entropy problems), I suggest replacing DSA with
Ed25519, a elliptic curve signature scheme which was designed with
those problems in mind. Having not enough entropy is not that
critical with Ed25519 as it was with DSA or ECDSA.

Besides being more secure than DSA, its performance is better too.

More info on Ed25519: http://ed25519.cr.yp.to

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 generic/etc/rc.once.d/openssh | 8 ++++----
 generic/etc/ssh/sshd_config   | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/generic/etc/rc.once.d/openssh b/generic/etc/rc.once.d/openssh
index 83e6e37..0a63433 100644
--- a/generic/etc/rc.once.d/openssh
+++ b/generic/etc/rc.once.d/openssh
@@ -3,12 +3,12 @@
 PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
 
 OPENSSH_RSAKEY_DEFAULT="/etc/ssh/ssh_host_rsa_key"
-OPENSSH_DSAKEY_DEFAULT="/etc/ssh/ssh_host_dsa_key"
+OPENSSH_ED25519KEY_DEFAULT="/etc/ssh/ssh_host_ed25519_key"
 
 test -n "$OPENSSH_RSAKEY" || \
 	OPENSSH_RSAKEY=$OPENSSH_RSAKEY_DEFAULT
-test -n "$OPENSSH_DSAKEY" || \
-	OPENSSH_DSAKEY=$OPENSSH_DSAKEY_DEFAULT
+test -n "$OPENSSH_ED25519KEY" || \
+	OPENSSH_ED25519KEY=$OPENSSH_ED25519KEY_DEFAULT
 
 gen_key() {
 
@@ -29,5 +29,5 @@ gen_key() {
 }
 
 gen_key rsa "$OPENSSH_RSAKEY"
-gen_key dsa "$OPENSSH_DSAKEY"
+gen_key ed25519 "$OPENSSH_ED25519KEY"
 
diff --git a/generic/etc/ssh/sshd_config b/generic/etc/ssh/sshd_config
index 7cd7897..f529fc4 100644
--- a/generic/etc/ssh/sshd_config
+++ b/generic/etc/ssh/sshd_config
@@ -20,7 +20,7 @@ Protocol 2
 #HostKey /etc/ssh/ssh_host_key
 # HostKeys for protocol version 2
 HostKey /etc/ssh/ssh_host_rsa_key
-HostKey /etc/ssh/ssh_host_dsa_key
+HostKey /etc/ssh/ssh_host_ed25519_key
 
 # Lifetime and size of ephemeral version 1 server key
 #KeyRegenerationInterval 1h
-- 
2.4.2


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[ptxdist] [PATCH 2/3] openssh: Enable pre-auth sandboxing

[Clemens Gruber]

On Linux, OpenSSH tries to use seccomp and falls back to
rlimit if seccomp is not available.
Since OpenSSH 6.2, the Linux seccomp-filter sandbox is
supported on ARM platforms.

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 generic/etc/ssh/sshd_config | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/generic/etc/ssh/sshd_config b/generic/etc/ssh/sshd_config
index f529fc4..7856f70 100644
--- a/generic/etc/ssh/sshd_config
+++ b/generic/etc/ssh/sshd_config
@@ -88,7 +88,7 @@ PermitRootLogin yes
 #PrintLastLog yes
 #TCPKeepAlive yes
 #UseLogin no
-#UsePrivilegeSeparation yes
+UsePrivilegeSeparation sandbox
 #PermitUserEnvironment no
 #Compression delayed
 #ClientAliveInterval 0
-- 
2.4.2


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[ptxdist] [PATCH 3/3] openssh: Bump to current stable version 6.8p1

[Clemens Gruber]

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
---
 rules/openssh.make | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/openssh.make b/rules/openssh.make
index b43e147..4277148 100644
--- a/rules/openssh.make
+++ b/rules/openssh.make
@@ -17,8 +17,8 @@ PACKAGES-$(PTXCONF_OPENSSH) += openssh
 #
 # Paths and names
 #
-OPENSSH_VERSION	:= 6.6p1
-OPENSSH_MD5	:= 3e9800e6bca1fbac0eea4d41baa7f239
+OPENSSH_VERSION	:= 6.8p1
+OPENSSH_MD5	:= 08f72de6751acfbd0892b5f003922701
 OPENSSH		:= openssh-$(OPENSSH_VERSION)
 OPENSSH_SUFFIX	:= tar.gz
 OPENSSH_URL	:= \
-- 
2.4.2


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