[Buildroot] [PATCH v3] package/wpa_supplicant: add Smart card option

[Buildroot] [PATCH v3] package/wpa_supplicant: add Smart card option

[Lars Wikman]

CONFIG_SMARTCARD was unconditionally disabled which has meant that
even if OpenSSL is compiled with engine support and the supplicant
is configured to use an engine it would warn that it was compiled
without engine support.

This mechanism is used to enable the more secure forms of 802.1x
networking authentication such as EAP-TLS with hardware-delegated
cryptography and private keys protected in hardware.

It is still disabled by default in case there was an original reason.

Enabling the option will allow delegating private key access to TPM2,
ARM TrustZone and other specialized secure hardware for establishing
a network connection.

Signed-off-by: Lars Wikman <lars@underjord.io>

---
Changes v1 -> v2:
  - Change option name to focus on smartcard  (suggested by Sergey)
Changes v2 -> v3:
  - Change setting disabled to match convention (suggested by Baruch)

Signed-off-by: Lars Wikman <lars@underjord.io>
---
 package/wpa_supplicant/Config.in         | 6 ++++++
 package/wpa_supplicant/wpa_supplicant.mk | 9 ++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/package/wpa_supplicant/Config.in b/package/wpa_supplicant/Config.in
index 92953f69f0..2aee108fc1 100644
--- a/package/wpa_supplicant/Config.in
+++ b/package/wpa_supplicant/Config.in
@@ -175,4 +175,10 @@ config BR2_PACKAGE_WPA_SUPPLICANT_DBUS_INTROSPECTION
 	help
 	  Add introspection support for the DBus control interface.
 
+config BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD
+	bool "Smartcard support"
+	help
+	  Enable the smart card support. Required for OpenSSL engines
+	  to work using PKCS11 and 802.1x
+
 endif
diff --git a/package/wpa_supplicant/wpa_supplicant.mk b/package/wpa_supplicant/wpa_supplicant.mk
index 984959f679..6199e584d0 100644
--- a/package/wpa_supplicant/wpa_supplicant.mk
+++ b/package/wpa_supplicant/wpa_supplicant.mk
@@ -24,9 +24,6 @@ WPA_SUPPLICANT_CONFIG_ENABLE = \
 	CONFIG_INTERNAL_LIBTOMMATH \
 	CONFIG_MATCH_IFACE
 
-WPA_SUPPLICANT_CONFIG_DISABLE = \
-	CONFIG_SMARTCARD
-
 # libnl-3 needs -lm (for rint) and -lpthread if linking statically
 # And library order matters hence stick -lnl-3 first since it's appended
 # in the wpa_supplicant Makefiles as in LIBS+=-lnl-3 ... thus failing
@@ -180,6 +177,12 @@ WPA_SUPPLICANT_DEPENDENCIES += readline
 WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_READLINE
 endif
 
+ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD),y)
+WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_SMARTCARD
+else
+WPA_SUPPLICANT_CONFIG_DISABLE += CONFIG_SMARTCARD
+endif
+
 ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_CTRL_IFACE),y)
 define WPA_SUPPLICANT_ENABLE_CTRL_IFACE
 	sed -i '/ctrl_interface/s/^#//g' $(TARGET_DIR)/etc/wpa_supplicant.conf
-- 
2.34.1

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Re: [Buildroot] [PATCH v3] package/wpa_supplicant: add Smart card option

[Lars Wikman]

[-- Attachment #1.1: Type: text/plain, Size: 3302 bytes --]

Hi

I submitted a v3 which I see in patchwork but I don't see it in my sent
email so I'm uncertain about whether it reached the list okay.

Link in patchwork:
https://patchwork.ozlabs.org/project/buildroot/patch/20240903100952.3789698-1-lars@underjord.io/

-Lars

On Tue, Sep 3, 2024 at 12:09 PM Lars Wikman <lars@underjord.io> wrote:

> CONFIG_SMARTCARD was unconditionally disabled which has meant that
> even if OpenSSL is compiled with engine support and the supplicant
> is configured to use an engine it would warn that it was compiled
> without engine support.
>
> This mechanism is used to enable the more secure forms of 802.1x
> networking authentication such as EAP-TLS with hardware-delegated
> cryptography and private keys protected in hardware.
>
> It is still disabled by default in case there was an original reason.
>
> Enabling the option will allow delegating private key access to TPM2,
> ARM TrustZone and other specialized secure hardware for establishing
> a network connection.
>
> Signed-off-by: Lars Wikman <lars@underjord.io>
>
> ---
> Changes v1 -> v2:
>   - Change option name to focus on smartcard  (suggested by Sergey)
> Changes v2 -> v3:
>   - Change setting disabled to match convention (suggested by Baruch)
>
> Signed-off-by: Lars Wikman <lars@underjord.io>
> ---
>  package/wpa_supplicant/Config.in         | 6 ++++++
>  package/wpa_supplicant/wpa_supplicant.mk | 9 ++++++---
>  2 files changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/package/wpa_supplicant/Config.in
> b/package/wpa_supplicant/Config.in
> index 92953f69f0..2aee108fc1 100644
> --- a/package/wpa_supplicant/Config.in
> +++ b/package/wpa_supplicant/Config.in
> @@ -175,4 +175,10 @@ config BR2_PACKAGE_WPA_SUPPLICANT_DBUS_INTROSPECTION
>         help
>           Add introspection support for the DBus control interface.
>
> +config BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD
> +       bool "Smartcard support"
> +       help
> +         Enable the smart card support. Required for OpenSSL engines
> +         to work using PKCS11 and 802.1x
> +
>  endif
> diff --git a/package/wpa_supplicant/wpa_supplicant.mk
> b/package/wpa_supplicant/wpa_supplicant.mk
> index 984959f679..6199e584d0 100644
> --- a/package/wpa_supplicant/wpa_supplicant.mk
> +++ b/package/wpa_supplicant/wpa_supplicant.mk
> @@ -24,9 +24,6 @@ WPA_SUPPLICANT_CONFIG_ENABLE = \
>         CONFIG_INTERNAL_LIBTOMMATH \
>         CONFIG_MATCH_IFACE
>
> -WPA_SUPPLICANT_CONFIG_DISABLE = \
> -       CONFIG_SMARTCARD
> -
>  # libnl-3 needs -lm (for rint) and -lpthread if linking statically
>  # And library order matters hence stick -lnl-3 first since it's appended
>  # in the wpa_supplicant Makefiles as in LIBS+=-lnl-3 ... thus failing
> @@ -180,6 +177,12 @@ WPA_SUPPLICANT_DEPENDENCIES += readline
>  WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_READLINE
>  endif
>
> +ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD),y)
> +WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_SMARTCARD
> +else
> +WPA_SUPPLICANT_CONFIG_DISABLE += CONFIG_SMARTCARD
> +endif
> +
>  ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_CTRL_IFACE),y)
>  define WPA_SUPPLICANT_ENABLE_CTRL_IFACE
>         sed -i '/ctrl_interface/s/^#//g'
> $(TARGET_DIR)/etc/wpa_supplicant.conf
> --
> 2.34.1
>
>

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Re: [Buildroot] [PATCH v3] package/wpa_supplicant: add Smart card option

[Baruch Siach via buildroot]

Hi Lars,

On Mon, Sep 09 2024, Lars Wikman wrote:
> I submitted a v3 which I see in patchwork but I don't see it in my
> sent email so I'm uncertain about whether it reached the list okay.
>
> Link in patchwork: https://patchwork.ozlabs.org/project/buildroot/patch/20240903100952.3789698-1-lars@underjord.io/

Patches are tracked on patchwork. If your patch is there, maintainers
will get to it sooner or later.

Your patch is also on the list archive:

  https://lore.kernel.org/all/20240903100952.3789698-1-lars@underjord.io/

So all looks OK.

baruch

> On Tue, Sep 3, 2024 at 12:09 PM Lars Wikman <lars@underjord.io> wrote:
>
>  CONFIG_SMARTCARD was unconditionally disabled which has meant that
>  even if OpenSSL is compiled with engine support and the supplicant
>  is configured to use an engine it would warn that it was compiled
>  without engine support.
>
>  This mechanism is used to enable the more secure forms of 802.1x
>  networking authentication such as EAP-TLS with hardware-delegated
>  cryptography and private keys protected in hardware.
>
>  It is still disabled by default in case there was an original reason.
>
>  Enabling the option will allow delegating private key access to TPM2,
>  ARM TrustZone and other specialized secure hardware for establishing
>  a network connection.
>
>  Signed-off-by: Lars Wikman <lars@underjord.io>
>
>  ---
>  Changes v1 -> v2:
>    - Change option name to focus on smartcard  (suggested by Sergey)
>  Changes v2 -> v3:
>    - Change setting disabled to match convention (suggested by Baruch)
>
>  Signed-off-by: Lars Wikman <lars@underjord.io>
>  ---
>   package/wpa_supplicant/Config.in         | 6 ++++++
>   package/wpa_supplicant/wpa_supplicant.mk⚠️ | 9 ++++++---
>   2 files changed, 12 insertions(+), 3 deletions(-)
>
>  diff --git a/package/wpa_supplicant/Config.in b/package/wpa_supplicant/Config.in
>  index 92953f69f0..2aee108fc1 100644
>  --- a/package/wpa_supplicant/Config.in
>  +++ b/package/wpa_supplicant/Config.in
>  @@ -175,4 +175,10 @@ config BR2_PACKAGE_WPA_SUPPLICANT_DBUS_INTROSPECTION
>          help
>            Add introspection support for the DBus control interface.
>
>  +config BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD
>  +       bool "Smartcard support"
>  +       help
>  +         Enable the smart card support. Required for OpenSSL engines
>  +         to work using PKCS11 and 802.1x
>  +
>   endif
>  diff --git a/package/wpa_supplicant/wpa_supplicant.mk⚠️ b/package/wpa_supplicant/wpa_supplicant.mk⚠️
>  index 984959f679..6199e584d0 100644
>  --- a/package/wpa_supplicant/wpa_supplicant.mk⚠️
>  +++ b/package/wpa_supplicant/wpa_supplicant.mk⚠️
>  @@ -24,9 +24,6 @@ WPA_SUPPLICANT_CONFIG_ENABLE = \
>          CONFIG_INTERNAL_LIBTOMMATH \
>          CONFIG_MATCH_IFACE
>
>  -WPA_SUPPLICANT_CONFIG_DISABLE = \
>  -       CONFIG_SMARTCARD
>  -
>   # libnl-3 needs -lm (for rint) and -lpthread if linking statically
>   # And library order matters hence stick -lnl-3 first since it's appended
>   # in the wpa_supplicant Makefiles as in LIBS+=-lnl-3 ... thus failing
>  @@ -180,6 +177,12 @@ WPA_SUPPLICANT_DEPENDENCIES += readline
>   WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_READLINE
>   endif
>
>  +ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD),y)
>  +WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_SMARTCARD
>  +else
>  +WPA_SUPPLICANT_CONFIG_DISABLE += CONFIG_SMARTCARD
>  +endif
>  +
>   ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_CTRL_IFACE),y)
>   define WPA_SUPPLICANT_ENABLE_CTRL_IFACE
>          sed -i '/ctrl_interface/s/^#//g' $(TARGET_DIR)/etc/wpa_supplicant.conf
>  -- 
>  2.34.1
>
> _______________________________________________
> buildroot mailing list
> buildroot@buildroot.org
> https://lists.buildroot.org/mailman/listinfo/buildroot

-- 
                                                     ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch@tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -
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Re: [Buildroot] [PATCH v3] package/wpa_supplicant: add Smart card option

[Lars Wikman]

[-- Attachment #1.1: Type: text/plain, Size: 4401 bytes --]

Good, thanks :)

On Mon, Sep 9, 2024 at 9:46 AM Baruch Siach <baruch@tkos.co.il> wrote:

> Hi Lars,
>
> On Mon, Sep 09 2024, Lars Wikman wrote:
> > I submitted a v3 which I see in patchwork but I don't see it in my
> > sent email so I'm uncertain about whether it reached the list okay.
> >
> > Link in patchwork:
> https://patchwork.ozlabs.org/project/buildroot/patch/20240903100952.3789698-1-lars@underjord.io/
>
> Patches are tracked on patchwork. If your patch is there, maintainers
> will get to it sooner or later.
>
> Your patch is also on the list archive:
>
>   https://lore.kernel.org/all/20240903100952.3789698-1-lars@underjord.io/
>
> So all looks OK.
>
> baruch
>
> > On Tue, Sep 3, 2024 at 12:09 PM Lars Wikman <lars@underjord.io> wrote:
> >
> >  CONFIG_SMARTCARD was unconditionally disabled which has meant that
> >  even if OpenSSL is compiled with engine support and the supplicant
> >  is configured to use an engine it would warn that it was compiled
> >  without engine support.
> >
> >  This mechanism is used to enable the more secure forms of 802.1x
> >  networking authentication such as EAP-TLS with hardware-delegated
> >  cryptography and private keys protected in hardware.
> >
> >  It is still disabled by default in case there was an original reason.
> >
> >  Enabling the option will allow delegating private key access to TPM2,
> >  ARM TrustZone and other specialized secure hardware for establishing
> >  a network connection.
> >
> >  Signed-off-by: Lars Wikman <lars@underjord.io>
> >
> >  ---
> >  Changes v1 -> v2:
> >    - Change option name to focus on smartcard  (suggested by Sergey)
> >  Changes v2 -> v3:
> >    - Change setting disabled to match convention (suggested by Baruch)
> >
> >  Signed-off-by: Lars Wikman <lars@underjord.io>
> >  ---
> >   package/wpa_supplicant/Config.in         | 6 ++++++
> >   package/wpa_supplicant/wpa_supplicant.mk⚠️ | 9 ++++++---
> >   2 files changed, 12 insertions(+), 3 deletions(-)
> >
> >  diff --git a/package/wpa_supplicant/Config.in
> b/package/wpa_supplicant/Config.in
> >  index 92953f69f0..2aee108fc1 100644
> >  --- a/package/wpa_supplicant/Config.in
> >  +++ b/package/wpa_supplicant/Config.in
> >  @@ -175,4 +175,10 @@ config
> BR2_PACKAGE_WPA_SUPPLICANT_DBUS_INTROSPECTION
> >          help
> >            Add introspection support for the DBus control interface.
> >
> >  +config BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD
> >  +       bool "Smartcard support"
> >  +       help
> >  +         Enable the smart card support. Required for OpenSSL engines
> >  +         to work using PKCS11 and 802.1x
> >  +
> >   endif
> >  diff --git a/package/wpa_supplicant/wpa_supplicant.mk⚠️
> b/package/wpa_supplicant/wpa_supplicant.mk⚠️
> >  index 984959f679..6199e584d0 100644
> >  --- a/package/wpa_supplicant/wpa_supplicant.mk⚠️
> >  +++ b/package/wpa_supplicant/wpa_supplicant.mk⚠️
> >  @@ -24,9 +24,6 @@ WPA_SUPPLICANT_CONFIG_ENABLE = \
> >          CONFIG_INTERNAL_LIBTOMMATH \
> >          CONFIG_MATCH_IFACE
> >
> >  -WPA_SUPPLICANT_CONFIG_DISABLE = \
> >  -       CONFIG_SMARTCARD
> >  -
> >   # libnl-3 needs -lm (for rint) and -lpthread if linking statically
> >   # And library order matters hence stick -lnl-3 first since it's
> appended
> >   # in the wpa_supplicant Makefiles as in LIBS+=-lnl-3 ... thus failing
> >  @@ -180,6 +177,12 @@ WPA_SUPPLICANT_DEPENDENCIES += readline
> >   WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_READLINE
> >   endif
> >
> >  +ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD),y)
> >  +WPA_SUPPLICANT_CONFIG_ENABLE += CONFIG_SMARTCARD
> >  +else
> >  +WPA_SUPPLICANT_CONFIG_DISABLE += CONFIG_SMARTCARD
> >  +endif
> >  +
> >   ifeq ($(BR2_PACKAGE_WPA_SUPPLICANT_CTRL_IFACE),y)
> >   define WPA_SUPPLICANT_ENABLE_CTRL_IFACE
> >          sed -i '/ctrl_interface/s/^#//g'
> $(TARGET_DIR)/etc/wpa_supplicant.conf
> >  --
> >  2.34.1
> >
> > _______________________________________________
> > buildroot mailing list
> > buildroot@buildroot.org
> > https://lists.buildroot.org/mailman/listinfo/buildroot
>
> --
>                                                      ~. .~   Tk Open
> Systems
> =}------------------------------------------------ooO--U--Ooo------------{=
>    - baruch@tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -
>

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Re: [Buildroot] [PATCH v3] package/wpa_supplicant: add Smart card option

[Thomas Petazzoni via buildroot]

Hello Lars,

On Tue,  3 Sep 2024 12:09:52 +0200
Lars Wikman <lars@underjord.io> wrote:

> CONFIG_SMARTCARD was unconditionally disabled which has meant that
> even if OpenSSL is compiled with engine support and the supplicant
> is configured to use an engine it would warn that it was compiled
> without engine support.
> 
> This mechanism is used to enable the more secure forms of 802.1x
> networking authentication such as EAP-TLS with hardware-delegated
> cryptography and private keys protected in hardware.
> 
> It is still disabled by default in case there was an original reason.
> 
> Enabling the option will allow delegating private key access to TPM2,
> ARM TrustZone and other specialized secure hardware for establishing
> a network connection.
> 
> Signed-off-by: Lars Wikman <lars@underjord.io>
> 
> ---
> Changes v1 -> v2:
>   - Change option name to focus on smartcard  (suggested by Sergey)
> Changes v2 -> v3:
>   - Change setting disabled to match convention (suggested by Baruch)

Sorry for the delay in getting back to you. I reviewed/tested your
patch, but I believe something needs to be improved, but I wasn't sure
so I wasn't confident to do it myself.

I built the following configuration:

BR2_arm=y
BR2_cortex_a9=y
BR2_ARM_ENABLE_VFP=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
BR2_INIT_NONE=y
BR2_SYSTEM_BIN_SH_NONE=y
# BR2_PACKAGE_BUSYBOX is not set
BR2_PACKAGE_WPA_SUPPLICANT=y
# BR2_PACKAGE_WPA_SUPPLICANT_NL80211 is not set
BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD=y
# BR2_TARGET_ROOTFS_TAR is not set

which really has just wpa_supplicant with all options disabled except
smartcard. And my understanding is that in this configuration...
enabling the smartcard option is a no-op, because I don't even have
OpenSSL enabled in my configuration.

Since the smartcard option only affects the OpenSSL integration in
wpa_supplicant, shouldn't this option have:

        select BR2_PACKAGE_OPENSSL
        select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL

like the other options that need OpenSSL support?

Thanks in advance for your feedback,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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Re: [Buildroot] [PATCH v3] package/wpa_supplicant: add Smart card option

[Lars Wikman]

[-- Attachment #1.1: Type: text/plain, Size: 2470 bytes --]

Hi

Thanks for testing it out. I think you have the right idea. I can add those.

-L

On Tue, 29 Oct 2024 at 23:06, Thomas Petazzoni <thomas.petazzoni@bootlin.com>
wrote:

> Hello Lars,
>
> On Tue,  3 Sep 2024 12:09:52 +0200
> Lars Wikman <lars@underjord.io> wrote:
>
> > CONFIG_SMARTCARD was unconditionally disabled which has meant that
> > even if OpenSSL is compiled with engine support and the supplicant
> > is configured to use an engine it would warn that it was compiled
> > without engine support.
> >
> > This mechanism is used to enable the more secure forms of 802.1x
> > networking authentication such as EAP-TLS with hardware-delegated
> > cryptography and private keys protected in hardware.
> >
> > It is still disabled by default in case there was an original reason.
> >
> > Enabling the option will allow delegating private key access to TPM2,
> > ARM TrustZone and other specialized secure hardware for establishing
> > a network connection.
> >
> > Signed-off-by: Lars Wikman <lars@underjord.io>
> >
> > ---
> > Changes v1 -> v2:
> >   - Change option name to focus on smartcard  (suggested by Sergey)
> > Changes v2 -> v3:
> >   - Change setting disabled to match convention (suggested by Baruch)
>
> Sorry for the delay in getting back to you. I reviewed/tested your
> patch, but I believe something needs to be improved, but I wasn't sure
> so I wasn't confident to do it myself.
>
> I built the following configuration:
>
> BR2_arm=y
> BR2_cortex_a9=y
> BR2_ARM_ENABLE_VFP=y
> BR2_TOOLCHAIN_EXTERNAL=y
> BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
> BR2_INIT_NONE=y
> BR2_SYSTEM_BIN_SH_NONE=y
> # BR2_PACKAGE_BUSYBOX is not set
> BR2_PACKAGE_WPA_SUPPLICANT=y
> # BR2_PACKAGE_WPA_SUPPLICANT_NL80211 is not set
> BR2_PACKAGE_WPA_SUPPLICANT_SMARTCARD=y
> # BR2_TARGET_ROOTFS_TAR is not set
>
> which really has just wpa_supplicant with all options disabled except
> smartcard. And my understanding is that in this configuration...
> enabling the smartcard option is a no-op, because I don't even have
> OpenSSL enabled in my configuration.
>
> Since the smartcard option only affects the OpenSSL integration in
> wpa_supplicant, shouldn't this option have:
>
>         select BR2_PACKAGE_OPENSSL
>         select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL
>
> like the other options that need OpenSSL support?
>
> Thanks in advance for your feedback,
>
> Thomas
> --
> Thomas Petazzoni, CTO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>

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