[ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[Artur Wiebe]

How can openssh.postinst be disabled from within the rule files?
---
 rules/openssh.in   | 14 ++++++++++----
 rules/openssh.make |  2 ++
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/rules/openssh.in b/rules/openssh.in
index 09f5c5555..f9d1affbd 100644
--- a/rules/openssh.in
+++ b/rules/openssh.in
@@ -6,10 +6,10 @@ menuconfig OPENSSH
 	select OPENSSL
 	select LIBC_CRYPT
 	select LIBC_UTIL
-	select RC_ONCE if OPENSSH_SSHD && RUNTIME
+	select RC_ONCE if OPENSSH_SSHD_GENKEYS && RUNTIME
 	select BUSYBOX_START_STOP_DAEMON if OPENSSH_SSHD_STARTSCRIPT
 	select LIBSELINUX if GLOBAL_SELINUX
-	select OPENSSH_KEYGEN if OPENSSH_SSHD
+	select OPENSSH_KEYGEN if OPENSSH_SSHD_GENKEYS
 	prompt "openssh                       "
 	help
 	  secure shell client/server, an rlogin/rsh/rcp replacement
@@ -40,15 +40,21 @@ config OPENSSH_SSHD
 config OPENSSH_SSHD_STARTSCRIPT
 	bool
 	default y
-	depends on OPENSSH_SSHD
+	depends on OPENSSH_SSHD && INITMETHOD_BBINIT
 	prompt "install /etc/init.d/openssh"
 
 config OPENSSH_SSHD_SYSTEMD_UNIT
 	bool
 	default y
-	depends on OPENSSH_SSHD && SYSTEMD
+	depends on OPENSSH_SSHD && INITMETHOD_SYSTEMD
 	prompt "install systemd unit files for sshd"
 
+config OPENSSH_SSHD_GENKEYS
+	bool
+	default y
+	depends on OPENSSH_SSHD
+	prompt "generate sshd host keys at first boot"
+
 config OPENSSH_SCP
 	bool "scp"
 	help
diff --git a/rules/openssh.make b/rules/openssh.make
index cae04487f..0da2f23cd 100644
--- a/rules/openssh.make
+++ b/rules/openssh.make
@@ -105,8 +105,10 @@ ifdef PTXCONF_OPENSSH_SSHD
 		/etc/ssh/moduli)
 	@$(call install_copy, openssh, 0, 0, 0755, -, \
 		/usr/sbin/sshd)
+ifdef OPENSSH_SSHD_GENKEYS
 	@$(call install_alternative, openssh, 0, 0, 0755, /etc/rc.once.d/openssh)
 endif
+endif
 
 ifdef PTXCONF_INITMETHOD_BBINIT
 ifdef PTXCONF_OPENSSH_SSHD_STARTSCRIPT
-- 
2.29.2


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Re: [ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[Ladislav Michl]

On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> How can openssh.postinst be disabled from within the rule files?

The very same could be achieved with symlink in your BSP:
projectroot/etc/rc.once.d/openssh -> /dev/null

> ---
>  rules/openssh.in   | 14 ++++++++++----
>  rules/openssh.make |  2 ++
>  2 files changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/rules/openssh.in b/rules/openssh.in
> index 09f5c5555..f9d1affbd 100644
> --- a/rules/openssh.in
> +++ b/rules/openssh.in
> @@ -6,10 +6,10 @@ menuconfig OPENSSH
>  	select OPENSSL
>  	select LIBC_CRYPT
>  	select LIBC_UTIL
> -	select RC_ONCE if OPENSSH_SSHD && RUNTIME
> +	select RC_ONCE if OPENSSH_SSHD_GENKEYS && RUNTIME
>  	select BUSYBOX_START_STOP_DAEMON if OPENSSH_SSHD_STARTSCRIPT
>  	select LIBSELINUX if GLOBAL_SELINUX
> -	select OPENSSH_KEYGEN if OPENSSH_SSHD
> +	select OPENSSH_KEYGEN if OPENSSH_SSHD_GENKEYS
>  	prompt "openssh                       "
>  	help
>  	  secure shell client/server, an rlogin/rsh/rcp replacement
> @@ -40,15 +40,21 @@ config OPENSSH_SSHD
>  config OPENSSH_SSHD_STARTSCRIPT
>  	bool
>  	default y
> -	depends on OPENSSH_SSHD
> +	depends on OPENSSH_SSHD && INITMETHOD_BBINIT
>  	prompt "install /etc/init.d/openssh"
>  
>  config OPENSSH_SSHD_SYSTEMD_UNIT
>  	bool
>  	default y
> -	depends on OPENSSH_SSHD && SYSTEMD
> +	depends on OPENSSH_SSHD && INITMETHOD_SYSTEMD
>  	prompt "install systemd unit files for sshd"
>  
> +config OPENSSH_SSHD_GENKEYS
> +	bool
> +	default y
> +	depends on OPENSSH_SSHD
> +	prompt "generate sshd host keys at first boot"
> +
>  config OPENSSH_SCP
>  	bool "scp"
>  	help
> diff --git a/rules/openssh.make b/rules/openssh.make
> index cae04487f..0da2f23cd 100644
> --- a/rules/openssh.make
> +++ b/rules/openssh.make
> @@ -105,8 +105,10 @@ ifdef PTXCONF_OPENSSH_SSHD
>  		/etc/ssh/moduli)
>  	@$(call install_copy, openssh, 0, 0, 0755, -, \
>  		/usr/sbin/sshd)
> +ifdef OPENSSH_SSHD_GENKEYS
>  	@$(call install_alternative, openssh, 0, 0, 0755, /etc/rc.once.d/openssh)
>  endif
> +endif
>  
>  ifdef PTXCONF_INITMETHOD_BBINIT
>  ifdef PTXCONF_OPENSSH_SSHD_STARTSCRIPT
> -- 
> 2.29.2
> 
> 
> _______________________________________________
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> ptxdist@pengutronix.de
> To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de

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Re: [ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[Roland Hieber]

On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > How can openssh.postinst be disabled from within the rule files?
> 
> The very same could be achieved with symlink in your BSP:
> projectroot/etc/rc.once.d/openssh -> /dev/null

I don't understand why you want to disable this. The SSH server will not
start without host keys. Or do you want to install a static version of
the host keys generated at build time? If so, there should be an option
for this. But for now, in my opinion, disabling OPENSSH_SSHD_GENKEYS
will just lead to a broken SSH server.

 - Roland

> 
> > ---
> >  rules/openssh.in   | 14 ++++++++++----
> >  rules/openssh.make |  2 ++
> >  2 files changed, 12 insertions(+), 4 deletions(-)
> > 
> > diff --git a/rules/openssh.in b/rules/openssh.in
> > index 09f5c5555..f9d1affbd 100644
> > --- a/rules/openssh.in
> > +++ b/rules/openssh.in
> > @@ -6,10 +6,10 @@ menuconfig OPENSSH
> >  	select OPENSSL
> >  	select LIBC_CRYPT
> >  	select LIBC_UTIL
> > -	select RC_ONCE if OPENSSH_SSHD && RUNTIME
> > +	select RC_ONCE if OPENSSH_SSHD_GENKEYS && RUNTIME
> >  	select BUSYBOX_START_STOP_DAEMON if OPENSSH_SSHD_STARTSCRIPT
> >  	select LIBSELINUX if GLOBAL_SELINUX
> > -	select OPENSSH_KEYGEN if OPENSSH_SSHD
> > +	select OPENSSH_KEYGEN if OPENSSH_SSHD_GENKEYS
> >  	prompt "openssh                       "
> >  	help
> >  	  secure shell client/server, an rlogin/rsh/rcp replacement
> > @@ -40,15 +40,21 @@ config OPENSSH_SSHD
> >  config OPENSSH_SSHD_STARTSCRIPT
> >  	bool
> >  	default y
> > -	depends on OPENSSH_SSHD
> > +	depends on OPENSSH_SSHD && INITMETHOD_BBINIT
> >  	prompt "install /etc/init.d/openssh"
> >  
> >  config OPENSSH_SSHD_SYSTEMD_UNIT
> >  	bool
> >  	default y
> > -	depends on OPENSSH_SSHD && SYSTEMD
> > +	depends on OPENSSH_SSHD && INITMETHOD_SYSTEMD
> >  	prompt "install systemd unit files for sshd"
> >  
> > +config OPENSSH_SSHD_GENKEYS
> > +	bool
> > +	default y
> > +	depends on OPENSSH_SSHD
> > +	prompt "generate sshd host keys at first boot"
> > +
> >  config OPENSSH_SCP
> >  	bool "scp"
> >  	help
> > diff --git a/rules/openssh.make b/rules/openssh.make
> > index cae04487f..0da2f23cd 100644
> > --- a/rules/openssh.make
> > +++ b/rules/openssh.make
> > @@ -105,8 +105,10 @@ ifdef PTXCONF_OPENSSH_SSHD
> >  		/etc/ssh/moduli)
> >  	@$(call install_copy, openssh, 0, 0, 0755, -, \
> >  		/usr/sbin/sshd)
> > +ifdef OPENSSH_SSHD_GENKEYS
> >  	@$(call install_alternative, openssh, 0, 0, 0755, /etc/rc.once.d/openssh)
> >  endif
> > +endif
> >  
> >  ifdef PTXCONF_INITMETHOD_BBINIT
> >  ifdef PTXCONF_OPENSSH_SSHD_STARTSCRIPT
> > -- 
> > 2.29.2
> > 
> > 
> > _______________________________________________
> > ptxdist mailing list
> > ptxdist@pengutronix.de
> > To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de
> 
> _______________________________________________
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> ptxdist@pengutronix.de
> To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de
> 

-- 
Roland Hieber, Pengutronix e.K.          | r.hieber@pengutronix.de     |
Steuerwalder Str. 21                     | https://www.pengutronix.de/ |
31137 Hildesheim, Germany                | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686         | Fax:   +49-5121-206917-5555 |

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Re: [ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[Ladislav Michl]

On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > How can openssh.postinst be disabled from within the rule files?
> > 
> > The very same could be achieved with symlink in your BSP:
> > projectroot/etc/rc.once.d/openssh -> /dev/null
> 
> I don't understand why you want to disable this. The SSH server will not
> start without host keys. Or do you want to install a static version of
> the host keys generated at build time? 

Yes, keys are static, generated at build time. Root filesystem is
read-only.

> If so, there should be an option for this. But for now, in my opinion,
> disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.

As this is easy to solve at BSP level I never thought it could
be a thing :)

	ladis

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Re: [ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[Roland Hieber]

On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > How can openssh.postinst be disabled from within the rule files?
> > > 
> > > The very same could be achieved with symlink in your BSP:
> > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > 
> > I don't understand why you want to disable this. The SSH server will not
> > start without host keys. Or do you want to install a static version of
> > the host keys generated at build time? 
> 
> Yes, keys are static, generated at build time. Root filesystem is
> read-only.
> 
> > If so, there should be an option for this. But for now, in my opinion,
> > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> 
> As this is easy to solve at BSP level I never thought it could
> be a thing :)

OK, but at least I would mention it in the kconfig help text. The
openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
install_alternative if this option is disabled.

 - Roland

-- 
Roland Hieber, Pengutronix e.K.          | r.hieber@pengutronix.de     |
Steuerwalder Str. 21                     | https://www.pengutronix.de/ |
31137 Hildesheim, Germany                | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686         | Fax:   +49-5121-206917-5555 |

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Re: [ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[Michael Olbrich]

On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > How can openssh.postinst be disabled from within the rule files?
> > > > 
> > > > The very same could be achieved with symlink in your BSP:
> > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > 
> > > I don't understand why you want to disable this. The SSH server will not
> > > start without host keys. Or do you want to install a static version of
> > > the host keys generated at build time? 
> > 
> > Yes, keys are static, generated at build time. Root filesystem is
> > read-only.
> > 
> > > If so, there should be an option for this. But for now, in my opinion,
> > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > 
> > As this is easy to solve at BSP level I never thought it could
> > be a thing :)
> 
> OK, but at least I would mention it in the kconfig help text. The

Ack.

> openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> install_alternative if this option is disabled.

No. Shared ssh server keys are a bad idea. That's not something I want to
merge upstream.

But there are other use-cases to not use rc-once, e.g. if the server keys
are generated during provisioning. And not selecting rc-once in this case
makes sense, so this is acceptable im general.

Michael


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Re: [ptxdist] [PATCH] DRAFT: openssh: make host key generation optional

[Michael Olbrich]

On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> How can openssh.postinst be disabled from within the rule files?
> ---
>  rules/openssh.in   | 14 ++++++++++----
>  rules/openssh.make |  2 ++
>  2 files changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/rules/openssh.in b/rules/openssh.in
> index 09f5c5555..f9d1affbd 100644
> --- a/rules/openssh.in
> +++ b/rules/openssh.in
> @@ -6,10 +6,10 @@ menuconfig OPENSSH
>  	select OPENSSL
>  	select LIBC_CRYPT
>  	select LIBC_UTIL
> -	select RC_ONCE if OPENSSH_SSHD && RUNTIME
> +	select RC_ONCE if OPENSSH_SSHD_GENKEYS && RUNTIME
>  	select BUSYBOX_START_STOP_DAEMON if OPENSSH_SSHD_STARTSCRIPT
>  	select LIBSELINUX if GLOBAL_SELINUX
> -	select OPENSSH_KEYGEN if OPENSSH_SSHD
> +	select OPENSSH_KEYGEN if OPENSSH_SSHD_GENKEYS
>  	prompt "openssh                       "
>  	help
>  	  secure shell client/server, an rlogin/rsh/rcp replacement
> @@ -40,15 +40,21 @@ config OPENSSH_SSHD
>  config OPENSSH_SSHD_STARTSCRIPT
>  	bool
>  	default y
> -	depends on OPENSSH_SSHD
> +	depends on OPENSSH_SSHD && INITMETHOD_BBINIT

unrelated.

>  	prompt "install /etc/init.d/openssh"
>  
>  config OPENSSH_SSHD_SYSTEMD_UNIT
>  	bool
>  	default y
> -	depends on OPENSSH_SSHD && SYSTEMD
> +	depends on OPENSSH_SSHD && INITMETHOD_SYSTEMD

this as well.

Michael

>  	prompt "install systemd unit files for sshd"
>  
> +config OPENSSH_SSHD_GENKEYS
> +	bool
> +	default y
> +	depends on OPENSSH_SSHD
> +	prompt "generate sshd host keys at first boot"
> +
>  config OPENSSH_SCP
>  	bool "scp"
>  	help
> diff --git a/rules/openssh.make b/rules/openssh.make
> index cae04487f..0da2f23cd 100644
> --- a/rules/openssh.make
> +++ b/rules/openssh.make
> @@ -105,8 +105,10 @@ ifdef PTXCONF_OPENSSH_SSHD
>  		/etc/ssh/moduli)
>  	@$(call install_copy, openssh, 0, 0, 0755, -, \
>  		/usr/sbin/sshd)
> +ifdef OPENSSH_SSHD_GENKEYS
>  	@$(call install_alternative, openssh, 0, 0, 0755, /etc/rc.once.d/openssh)
>  endif
> +endif
>  
>  ifdef PTXCONF_INITMETHOD_BBINIT
>  ifdef PTXCONF_OPENSSH_SSHD_STARTSCRIPT
> -- 
> 2.29.2
> 
> 
> _______________________________________________
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> ptxdist@pengutronix.de
> To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de
> 

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Re: [ptxdist] ?==?utf-8?q? ?==?utf-8?q? [PATCH] DRAFT:?==?utf-8?q? openssh: make host key generation optional

[Artur Wiebe]

On Monday, November 16, 2020 10:36 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
 
> On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> > On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > > How can openssh.postinst be disabled from within the rule files?
> > > > > 
> > > > > The very same could be achieved with symlink in your BSP:
> > > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > > 
> > > > I don't understand why you want to disable this. The SSH server will not
> > > > start without host keys. Or do you want to install a static version of
> > > > the host keys generated at build time? 
> > > 
> > > Yes, keys are static, generated at build time. Root filesystem is
> > > read-only.
> > > 
> > > > If so, there should be an option for this. But for now, in my opinion,
> > > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > > 
> > > As this is easy to solve at BSP level I never thought it could
> > > be a thing :)
> > 
> > OK, but at least I would mention it in the kconfig help text. The
> 
> Ack.
> 
> > openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> > install_alternative if this option is disabled.
> 
> No. Shared ssh server keys are a bad idea. That's not something I want to
> merge upstream.

This was also my concern...

> 
> But there are other use-cases to not use rc-once, e.g. if the server keys
> are generated during provisioning. And not selecting rc-once in this case
> makes sense, so this is acceptable im general.

I still need a way to disable openssh.postinst if OPENSSH_SSHD_GENKEYS is not set.

> 
> Michael
> 
> 
> _______________________________________________
> ptxdist mailing list
> ptxdist@pengutronix.de
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Re: [ptxdist] ?= [PATCH] DRAFT:=?utf-8?q? openssh: make host key generation optional

[Michael Olbrich]

On Mon, Nov 16, 2020 at 10:45:07AM +0100, Artur Wiebe wrote:
> On Monday, November 16, 2020 10:36 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
> > On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> > > On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > > > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > > > How can openssh.postinst be disabled from within the rule files?
> > > > > > 
> > > > > > The very same could be achieved with symlink in your BSP:
> > > > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > > > 
> > > > > I don't understand why you want to disable this. The SSH server will not
> > > > > start without host keys. Or do you want to install a static version of
> > > > > the host keys generated at build time? 
> > > > 
> > > > Yes, keys are static, generated at build time. Root filesystem is
> > > > read-only.
> > > > 
> > > > > If so, there should be an option for this. But for now, in my opinion,
> > > > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > > > 
> > > > As this is easy to solve at BSP level I never thought it could
> > > > be a thing :)
> > > 
> > > OK, but at least I would mention it in the kconfig help text. The
> > 
> > Ack.
> > 
> > > openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> > > install_alternative if this option is disabled.
> > 
> > No. Shared ssh server keys are a bad idea. That's not something I want to
> > merge upstream.
> 
> This was also my concern...
> 
> > 
> > But there are other use-cases to not use rc-once, e.g. if the server keys
> > are generated during provisioning. And not selecting rc-once in this case
> > makes sense, so this is acceptable im general.
> 
> I still need a way to disable openssh.postinst if OPENSSH_SSHD_GENKEYS is not set.

Hmmm, right. In the BSP, a /dev/null symlinks works for this as well, but
we currently don't have a way to not install the postinst script. We could
do something like this (untested):

	$(call install_script_replace, openssh, postinst, @RC_ONCE@, \
		$(call ptx/ifdef, PTXCONF_OPENSSH_SSHD_GENKEYS,,#))

And in rules/openssh.postinst:

#!/bin/sh
@RC_ONCE@$DESTDIR/usr/sbin/enable-rc-once openssh

This way the script may be installed, but it will do nothing. If
PTXCONF_OPENSSH_SSHD_GENKEYS is disabled.

Michael

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [ptxdist] ?==?utf-8?q? ?==?utf-8?q? ?= [PATCH]?==?utf-8?q? DRAFT:l

[Artur Wiebe]

Doesn't work... :(
 
On Monday, November 16, 2020 11:32 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
 
> On Mon, Nov 16, 2020 at 10:45:07AM +0100, Artur Wiebe wrote:
> > On Monday, November 16, 2020 10:36 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
> > > On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> > > > On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > > > > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > > > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > > > > How can openssh.postinst be disabled from within the rule files?
> > > > > > > 
> > > > > > > The very same could be achieved with symlink in your BSP:
> > > > > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > > > > 
> > > > > > I don't understand why you want to disable this. The SSH server will not
> > > > > > start without host keys. Or do you want to install a static version of
> > > > > > the host keys generated at build time? 
> > > > > 
> > > > > Yes, keys are static, generated at build time. Root filesystem is
> > > > > read-only.
> > > > > 
> > > > > > If so, there should be an option for this. But for now, in my opinion,
> > > > > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > > > > 
> > > > > As this is easy to solve at BSP level I never thought it could
> > > > > be a thing :)
> > > > 
> > > > OK, but at least I would mention it in the kconfig help text. The
> > > 
> > > Ack.
> > > 
> > > > openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> > > > install_alternative if this option is disabled.
> > > 
> > > No. Shared ssh server keys are a bad idea. That's not something I want to
> > > merge upstream.
> > 
> > This was also my concern...
> > 
> > > 
> > > But there are other use-cases to not use rc-once, e.g. if the server keys
> > > are generated during provisioning. And not selecting rc-once in this case
> > > makes sense, so this is acceptable im general.
> > 
> > I still need a way to disable openssh.postinst if OPENSSH_SSHD_GENKEYS is not set.
> 
> Hmmm, right. In the BSP, a /dev/null symlinks works for this as well, but
> we currently don't have a way to not install the postinst script. We could
> do something like this (untested):
> 
> 	$(call install_script_replace, openssh, postinst, @RC_ONCE@, \
> 		$(call ptx/ifdef, PTXCONF_OPENSSH_SSHD_GENKEYS,,#))

-----------------------------
target: openssh.targetinstall
-----------------------------

install_init:   preparing for image creation of 'openssh'...
install_init:   @ARCH@ -> x86_64
install_init:   @PACKAGE@ -> openssh
install_init:   @VERSION@ -> 8.3p1
install_init:   @DEPENDS@ -> openssl, rc-once, zlib
install_init:   preinst not available
install_init:   postinst packaging: 'root/rules/openssh.postinst'
install_init:   prerm not available
install_init:   postrm not available
install_fixup:  @PRIORITY@ -> optional ... done.
install_fixup:  @SECTION@ -> base ... done.
install_fixup:  @AUTHOR@ -> "Marc Kleine-Budde <mkl\@pengutronix.de>" ... done.
install_fixup:  @DESCRIPTION@ -> missing ... done.
XPKG=openssh; FILE=postinst; PLACEHOLDER=@RC_ONCE@; VALUE=; CMD="install_script_replace"; if [ ! -f "/tmp/ptxdist.qS1dcP/openssh.targetinstall.$XPKG" ]; then echo; echo "Error: install_init was not called for package '$XPKG'!"; echo "This is probably caused by a typo in the package name of:"; echo "\$(call $CMD, $XPKG, ...)"; echo; exit 1; fi; echo "ptxd_install_script_replace '$FILE' '$PLACEHOLDER' '$VALUE'" >> "/mnt/root/platform-x86/state/$XPKG.cmds"
xpkg_finish:    collecting license (BSD AND BSD-2-Clause AND BSD-3-Clause AND MIT AND Beerware AND ISC) ... done.
xpkg_finish:    creating opkg package ...


ptxdist: error: ptxd_install_script_replace: 'dst' must be an absolute path!


xpkg_finish: failed.

> 
> And in rules/openssh.postinst:
> 
> #!/bin/sh
> @RC_ONCE@$DESTDIR/usr/sbin/enable-rc-once openssh
> 
> This way the script may be installed, but it will do nothing. If
> PTXCONF_OPENSSH_SSHD_GENKEYS is disabled.
> 
> Michael
> 
> -- 
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> 
> _______________________________________________
> ptxdist mailing list
> ptxdist@pengutronix.de
> To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de


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Re: [ptxdist] ?= [PATCH] DRAFT:=?utf-8?q? openssh: make host key generation optional

[Denis Osterland-Heim]

Hi,

If I have a ro root, I disable rconce completely and implement something comparable for a data partition
and mount the device unique keys to /etc/ssh/.
rconce mount your ro root rw and stores something, at least the "done" marker file, to your root.
I assume you are fine with this changes and just want to keep the key over updates and therefor you should really consider a data/config partition.
You may also generate the keys in production and mount the config partition read-only to /etc/ssh/.
But do NOT deploy the same key to different devices.

Regards, Denis

Am Montag, den 16.11.2020, 11:32 +0100 schrieb Michael Olbrich:
> On Mon, Nov 16, 2020 at 10:45:07AM +0100, Artur Wiebe wrote:
> > On Monday, November 16, 2020 10:36 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote:
> > > On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> > > > On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > > > > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > > > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > > > > How can openssh.postinst be disabled from within the rule files?
> > > > > > >
> > > > > > > The very same could be achieved with symlink in your BSP:
> > > > > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > > > >
> > > > > > I don't understand why you want to disable this. The SSH server will not
> > > > > > start without host keys. Or do you want to install a static version of
> > > > > > the host keys generated at build time?
> > > > >
> > > > > Yes, keys are static, generated at build time. Root filesystem is
> > > > > read-only.
> > > > >
> > > > > > If so, there should be an option for this. But for now, in my opinion,
> > > > > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > > > >
> > > > > As this is easy to solve at BSP level I never thought it could
> > > > > be a thing :)
> > > >
> > > > OK, but at least I would mention it in the kconfig help text. The
> > >
> > > Ack.
> > >
> > > > openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> > > > install_alternative if this option is disabled.
> > >
> > > No. Shared ssh server keys are a bad idea. That's not something I want to
> > > merge upstream.
> >
> > This was also my concern...
> >
> > >
> > > But there are other use-cases to not use rc-once, e.g. if the server keys
> > > are generated during provisioning. And not selecting rc-once in this case
> > > makes sense, so this is acceptable im general.
> >
> > I still need a way to disable openssh.postinst if OPENSSH_SSHD_GENKEYS is not set.
>
> Hmmm, right. In the BSP, a /dev/null symlinks works for this as well, but
> we currently don't have a way to not install the postinst script. We could
> do something like this (untested):
>
> $(call install_script_replace, openssh, postinst, @RC_ONCE@, \
> $(call ptx/ifdef, PTXCONF_OPENSSH_SSHD_GENKEYS,,#))
>
> And in rules/openssh.postinst:
>
> #!/bin/sh
> @RC_ONCE@$DESTDIR/usr/sbin/enable-rc-once openssh
>
> This way the script may be installed, but it will do nothing. If
> PTXCONF_OPENSSH_SSHD_GENKEYS is disabled.
>
> Michael
>
Diehl Connectivity Solutions GmbH
Geschäftsführung: Horst Leonberger
Sitz der Gesellschaft: Nürnberg - Registergericht: Amtsgericht
Nürnberg: HRB 32315

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Re: [ptxdist] ?==?utf-8?q? ?==?utf-8?q? ?= [PATCH]?==?utf-8?q? DRAFT:l

[Artur Wiebe]

Hi Michael,

I found a solution. What do you think?

Artur 
 
  
On Monday, November 16, 2020 11:32 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
 
> On Mon, Nov 16, 2020 at 10:45:07AM +0100, Artur Wiebe wrote:
> > On Monday, November 16, 2020 10:36 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
> > > On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> > > > On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > > > > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > > > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > > > > How can openssh.postinst be disabled from within the rule files?
> > > > > > > 
> > > > > > > The very same could be achieved with symlink in your BSP:
> > > > > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > > > > 
> > > > > > I don't understand why you want to disable this. The SSH server will not
> > > > > > start without host keys. Or do you want to install a static version of
> > > > > > the host keys generated at build time? 
> > > > > 
> > > > > Yes, keys are static, generated at build time. Root filesystem is
> > > > > read-only.
> > > > > 
> > > > > > If so, there should be an option for this. But for now, in my opinion,
> > > > > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > > > > 
> > > > > As this is easy to solve at BSP level I never thought it could
> > > > > be a thing :)
> > > > 
> > > > OK, but at least I would mention it in the kconfig help text. The
> > > 
> > > Ack.
> > > 
> > > > openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> > > > install_alternative if this option is disabled.
> > > 
> > > No. Shared ssh server keys are a bad idea. That's not something I want to
> > > merge upstream.
> > 
> > This was also my concern...
> > 
> > > 
> > > But there are other use-cases to not use rc-once, e.g. if the server keys
> > > are generated during provisioning. And not selecting rc-once in this case
> > > makes sense, so this is acceptable im general.
> > 
> > I still need a way to disable openssh.postinst if OPENSSH_SSHD_GENKEYS is not set.
> 
> Hmmm, right. In the BSP, a /dev/null symlinks works for this as well, but
> we currently don't have a way to not install the postinst script. We could
> do something like this (untested):
> 
> 	$(call install_script_replace, openssh, postinst, @RC_ONCE@, \
> 		$(call ptx/ifdef, PTXCONF_OPENSSH_SSHD_GENKEYS,,#))
> 
> And in rules/openssh.postinst:
> 
> #!/bin/sh
> @RC_ONCE@$DESTDIR/usr/sbin/enable-rc-once openssh
> 
> This way the script may be installed, but it will do nothing. If
> PTXCONF_OPENSSH_SSHD_GENKEYS is disabled.
> 
> Michael
> 
> -- 
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> 
> _______________________________________________
> ptxdist mailing list
> ptxdist@pengutronix.de
> To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de


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Re: [ptxdist] ?= ?==?utf-8?q? [PATCH]?==?utf-8?q? DRAFT:l

[Michael Olbrich]

On Mon, Nov 16, 2020 at 04:09:58PM +0100, Artur Wiebe wrote:
> Doesn't work... :(

Hmm, might be a bug in install_script_replace. It's not actually used in
any upstream package... I'll have a closer look.

Michael

> On Monday, November 16, 2020 11:32 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
>  
> > On Mon, Nov 16, 2020 at 10:45:07AM +0100, Artur Wiebe wrote:
> > > On Monday, November 16, 2020 10:36 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
> > > > On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> > > > > On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > > > > > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > > > > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > > > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > > > > > How can openssh.postinst be disabled from within the rule files?
> > > > > > > > 
> > > > > > > > The very same could be achieved with symlink in your BSP:
> > > > > > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > > > > > 
> > > > > > > I don't understand why you want to disable this. The SSH server will not
> > > > > > > start without host keys. Or do you want to install a static version of
> > > > > > > the host keys generated at build time? 
> > > > > > 
> > > > > > Yes, keys are static, generated at build time. Root filesystem is
> > > > > > read-only.
> > > > > > 
> > > > > > > If so, there should be an option for this. But for now, in my opinion,
> > > > > > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > > > > > 
> > > > > > As this is easy to solve at BSP level I never thought it could
> > > > > > be a thing :)
> > > > > 
> > > > > OK, but at least I would mention it in the kconfig help text. The
> > > > 
> > > > Ack.
> > > > 
> > > > > openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> > > > > install_alternative if this option is disabled.
> > > > 
> > > > No. Shared ssh server keys are a bad idea. That's not something I want to
> > > > merge upstream.
> > > 
> > > This was also my concern...
> > > 
> > > > 
> > > > But there are other use-cases to not use rc-once, e.g. if the server keys
> > > > are generated during provisioning. And not selecting rc-once in this case
> > > > makes sense, so this is acceptable im general.
> > > 
> > > I still need a way to disable openssh.postinst if OPENSSH_SSHD_GENKEYS is not set.
> > 
> > Hmmm, right. In the BSP, a /dev/null symlinks works for this as well, but
> > we currently don't have a way to not install the postinst script. We could
> > do something like this (untested):
> > 
> > 	$(call install_script_replace, openssh, postinst, @RC_ONCE@, \
> > 		$(call ptx/ifdef, PTXCONF_OPENSSH_SSHD_GENKEYS,,#))
> 
> -----------------------------
> target: openssh.targetinstall
> -----------------------------
> 
> install_init:   preparing for image creation of 'openssh'...
> install_init:   @ARCH@ -> x86_64
> install_init:   @PACKAGE@ -> openssh
> install_init:   @VERSION@ -> 8.3p1
> install_init:   @DEPENDS@ -> openssl, rc-once, zlib
> install_init:   preinst not available
> install_init:   postinst packaging: 'root/rules/openssh.postinst'
> install_init:   prerm not available
> install_init:   postrm not available
> install_fixup:  @PRIORITY@ -> optional ... done.
> install_fixup:  @SECTION@ -> base ... done.
> install_fixup:  @AUTHOR@ -> "Marc Kleine-Budde <mkl\@pengutronix.de>" ... done.
> install_fixup:  @DESCRIPTION@ -> missing ... done.
> XPKG=openssh; FILE=postinst; PLACEHOLDER=@RC_ONCE@; VALUE=; CMD="install_script_replace"; if [ ! -f "/tmp/ptxdist.qS1dcP/openssh.targetinstall.$XPKG" ]; then echo; echo "Error: install_init was not called for package '$XPKG'!"; echo "This is probably caused by a typo in the package name of:"; echo "\$(call $CMD, $XPKG, ...)"; echo; exit 1; fi; echo "ptxd_install_script_replace '$FILE' '$PLACEHOLDER' '$VALUE'" >> "/mnt/root/platform-x86/state/$XPKG.cmds"
> xpkg_finish:    collecting license (BSD AND BSD-2-Clause AND BSD-3-Clause AND MIT AND Beerware AND ISC) ... done.
> xpkg_finish:    creating opkg package ...
> 
> 
> ptxdist: error: ptxd_install_script_replace: 'dst' must be an absolute path!
> 
> 
> xpkg_finish: failed.
> 
> > 
> > And in rules/openssh.postinst:
> > 
> > #!/bin/sh
> > @RC_ONCE@$DESTDIR/usr/sbin/enable-rc-once openssh
> > 
> > This way the script may be installed, but it will do nothing. If
> > PTXCONF_OPENSSH_SSHD_GENKEYS is disabled.
> > 
> > Michael
> > 
> > -- 
> > Pengutronix e.K.                           |                             |
> > Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
> > 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> > Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> > 
> > _______________________________________________
> > ptxdist mailing list
> > ptxdist@pengutronix.de
> > To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de
> 
> 
> _______________________________________________
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> ptxdist@pengutronix.de
> To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de
> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [ptxdist] ?= ?==?utf-8?q? [PATCH]?==?utf-8?q? DRAFT:l

[Roland Hieber]

On Mon, Nov 16, 2020 at 08:16:32PM +0100, Artur Wiebe wrote:
> Hi Michael,
> 
> I found a solution. What do you think?

Did you also intend to tell us your solution? :-)

 - Roland

> Artur 
>  
>   
> On Monday, November 16, 2020 11:32 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
>  
> > On Mon, Nov 16, 2020 at 10:45:07AM +0100, Artur Wiebe wrote:
> > > On Monday, November 16, 2020 10:36 CET, Michael Olbrich <m.olbrich@pengutronix.de> wrote: 
> > > > On Sun, Nov 15, 2020 at 06:08:56PM +0100, Roland Hieber wrote:
> > > > > On Sun, Nov 15, 2020 at 11:06:12AM +0100, Ladislav Michl wrote:
> > > > > > On Sat, Nov 14, 2020 at 09:34:47PM +0100, Roland Hieber wrote:
> > > > > > > On Fri, Nov 13, 2020 at 06:46:48PM +0100, Ladislav Michl wrote:
> > > > > > > > On Fri, Nov 13, 2020 at 03:19:55PM +0100, Artur Wiebe wrote:
> > > > > > > > > How can openssh.postinst be disabled from within the rule files?
> > > > > > > > 
> > > > > > > > The very same could be achieved with symlink in your BSP:
> > > > > > > > projectroot/etc/rc.once.d/openssh -> /dev/null
> > > > > > > 
> > > > > > > I don't understand why you want to disable this. The SSH server will not
> > > > > > > start without host keys. Or do you want to install a static version of
> > > > > > > the host keys generated at build time? 
> > > > > > 
> > > > > > Yes, keys are static, generated at build time. Root filesystem is
> > > > > > read-only.
> > > > > > 
> > > > > > > If so, there should be an option for this. But for now, in my opinion,
> > > > > > > disabling OPENSSH_SSHD_GENKEYS will just lead to a broken SSH server.
> > > > > > 
> > > > > > As this is easy to solve at BSP level I never thought it could
> > > > > > be a thing :)
> > > > > 
> > > > > OK, but at least I would mention it in the kconfig help text. The
> > > > 
> > > > Ack.
> > > > 
> > > > > openssh recipe could also just pick up /etc/ssh/ssh_host_*_key via
> > > > > install_alternative if this option is disabled.
> > > > 
> > > > No. Shared ssh server keys are a bad idea. That's not something I want to
> > > > merge upstream.
> > > 
> > > This was also my concern...
> > > 
> > > > 
> > > > But there are other use-cases to not use rc-once, e.g. if the server keys
> > > > are generated during provisioning. And not selecting rc-once in this case
> > > > makes sense, so this is acceptable im general.
> > > 
> > > I still need a way to disable openssh.postinst if OPENSSH_SSHD_GENKEYS is not set.
> > 
> > Hmmm, right. In the BSP, a /dev/null symlinks works for this as well, but
> > we currently don't have a way to not install the postinst script. We could
> > do something like this (untested):
> > 
> > 	$(call install_script_replace, openssh, postinst, @RC_ONCE@, \
> > 		$(call ptx/ifdef, PTXCONF_OPENSSH_SSHD_GENKEYS,,#))
> > 
> > And in rules/openssh.postinst:
> > 
> > #!/bin/sh
> > @RC_ONCE@$DESTDIR/usr/sbin/enable-rc-once openssh
> > 
> > This way the script may be installed, but it will do nothing. If
> > PTXCONF_OPENSSH_SSHD_GENKEYS is disabled.
> > 
> > Michael
> > 
> > -- 
> > Pengutronix e.K.                           |                             |
> > Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
> > 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> > Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> > 
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-- 
Roland Hieber, Pengutronix e.K.          | r.hieber@pengutronix.de     |
Steuerwalder Str. 21                     | https://www.pengutronix.de/ |
31137 Hildesheim, Germany                | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686         | Fax:   +49-5121-206917-5555 |

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Re: [ptxdist] ?= [PATCH]?==?utf-8?q? DRAFT:l

[Roland Hieber]

On Tue, Nov 17, 2020 at 12:24:21PM +0100, Roland Hieber wrote:
> On Mon, Nov 16, 2020 at 08:16:32PM +0100, Artur Wiebe wrote:
> > Hi Michael,
> > 
> > I found a solution. What do you think?
> 
> Did you also intend to tell us your solution? :-)

Ah, now I see. Your mail read like you had forgotten an attachment, but
you were referring to a mail in a different thread, which I hadn't seen
yet.

See <20201116191113.239636-1-artur@4wiebe.de> (2020-11-16, Artur Wiebe: "[ptxdist] [PATCH] openssh: make host key generation optional")

 - Roland

-- 
Roland Hieber, Pengutronix e.K.          | r.hieber@pengutronix.de     |
Steuerwalder Str. 21                     | https://www.pengutronix.de/ |
31137 Hildesheim, Germany                | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686         | Fax:   +49-5121-206917-5555 |

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