greybus-dev December 2020

greybus-dev@lists.linaro.org

7 participants
7 discussions

by Christopher Friedt

Hi everyone, I thought it might be a good time to start / re-start / join the conversation about authentication and encryption in Greybus, and in particular, for using a transport (and lower layers) other than UniPro. This is the logical next step after getting the TCP/IP transport working with gbridge over BLE, 802.15.4, WiFi, ethernet, UART, etc. There is the Component Authentication Protocol that exists already, but I'm not terribly familiar with it. Is anyone able to clarify if there is some overlap between CAP and some of the work that follows? If it's possible to re-use some of the CAP, that would be nice. Just over a year ago I set up authentication and encryption over Greybus for BeagleBoard.org. I was able to demonstrate it working over a TCP/IP transport. Here is some code that is on the back-burner for now. https://github.com/friedtco/gbridge/blob/feature/tcpip-ble-ipsp/pkauth.h https://github.com/friedtco/gbridge/blob/feature/tcpip-ble-ipsp/pkauth.c I have a PR open to anobli/gbridge on GitHub that pulls in the non-authentication / encryption changes. So the change that deals with auth and encryption is fairly small. On the Host side, it uses OpenSSL. We are using regular SSH keys for asymmetric authentication and the initial secure channel, then generating and sharing an AES-128 session key for symmetric encryption of the subsequent communications. The wireless SoC we're using for testing is the CC1352R from TI, and it has both AES and PK hardware accelerators. Most SoC's these days have an AES accelerator, at least. The handshake is described here, but I'll copy it into the email as well. https://github.com/friedtco/gbridge/blob/feature/tcpip-ble-ipsp/pkauth.c#L1… 1. Device sends its public key 2. Host compares device public key with those in a collection of trusted public keys. if not found connection closed. 3. Host sends its public key 4. Device compares host public key with those in a collection of trusted public keys. if not found connection closed. 5. Device creates a randomly generated message, "PlainText A". 6. Device encrypts "PlainText A" using Host public key, creating "CipherText A". 7. Device transmits "CipherText A" to Host. 8. Host decrypts "CipherText A" with Host private key, resulting in "PlainText B". 9. Host encrypts "PlainText B" using Device public key, creating "CipherText B". 10. Host transmits "CipherText B" to Device. 11. Device decrypts "CipherText B" with Device private key, resulting in "PlainText C". 12. Device compares "PlainText A" and "PlainText C", and responds with success or noauth. 13. Host creates a randomly generated message, "PlainText D". 14. Host encrypts "PlainText D" using Device public key, creating "CipherText D". 15. Host transmits "CipherText D" to Device. 16. Device decrypts "CipherText D" with Device private key, resulting in "PlainText E". 17. Device encrypts "PlainText E" using Host public key, creating "CipherText E". 18. Device transmits "CipherText E" to Host. 19. Host decrypts "CipherText E" with Host private key, resulting in "PlainText F". 20. Host compares "PlainText D" and "PlainText F", and responds with success or noauth. 21. Host generates symmetric session key as "PlainText G", pairs session key with socket. 22. Host encrypts "PlainText G" with Device public key, resulting in "CipherText G". 23. Host transmits "CipherText G" to device. 24. Device decrypts "CipherText G" using Device private key, resulting in "PlainText H". 25. Device pairs the session key ("PlainText H") with socket. Currently, this handshake happens when a new connection is created on any port / CPort (be it Control, GPIO, I2C, SPI, etc). While I understand that this security mechanism is not nearly as sophisticated as that of Thread, for example, it's fairly easy to implement locally for developers. However, we would ultimately like to support more than one method of authentication and encryption in Greybus. For the very basic method we implemented above, 5 additional message primitives were required: https://github.com/friedtco/gbridge/blob/feature/tcpip-ble-ipsp/pkauth.h#L32 #define GB_PKAUTH_TYPE_VERSION 0x7a #define GB_PKAUTH_TYPE_PUBKEY 0x7b #define GB_PKAUTH_TYPE_CHALLENGE 0x7c #define GB_PKAUTH_TYPE_CHALLENGE_RESP 0x7d #define GB_PKAUTH_TYPE_SESSION_KEY 0x7e For full negotiation of the auth mechanism and encryption algorithm (e.g. OAuth2 authentication + 3DES encryption) we'll probably need a few more message primitives, and likely a new minor version (at least) for each CPort protocol. It should be possible (although discouraged) to opt for everything in plaintext, but that would also be the default case for the CPort protocols as they exist today. I would love to hear some ideas about this from whoever is interested. Cheers, C

3 years, 3 months

[PATCH -next] greybus/audio_helper: Add missing unlock to avoid mismatched lock

by Zheng Yongjun

Fix a missing unlock in the error branch. Signed-off-by: Zheng Yongjun <zhengyongjun3(a)huawei.com> --- drivers/staging/greybus/audio_helper.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/staging/greybus/audio_helper.c b/drivers/staging/greybus/audio_helper.c index 237531ba60f3..293675dbea10 100644 --- a/drivers/staging/greybus/audio_helper.c +++ b/drivers/staging/greybus/audio_helper.c @@ -135,6 +135,7 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, if (!w) { dev_err(dapm->dev, "%s: widget not found\n", widget->name); + mutex_unlock(&dapm->card->dapm_mutex); return -EINVAL; } widget++; -- 2.22.0

3 years, 3 months

[PATCH] greybus: remove h from printk format specifier

by trix＠redhat.com

From: Tom Rix <trix(a)redhat.com> See Documentation/core-api/printk-formats.rst. h should no longer be used in the format specifier for printk. Signed-off-by: Tom Rix <trix(a)redhat.com> --- drivers/greybus/greybus_trace.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/greybus/greybus_trace.h b/drivers/greybus/greybus_trace.h index 1bc9f1275c65..616a3bd61aa6 100644 --- a/drivers/greybus/greybus_trace.h +++ b/drivers/greybus/greybus_trace.h @@ -40,7 +40,7 @@ DECLARE_EVENT_CLASS(gb_message, __entry->result = message->header->result; ), - TP_printk("size=%hu operation_id=0x%04x type=0x%02x result=0x%02x", + TP_printk("size=%u operation_id=0x%04x type=0x%02x result=0x%02x", __entry->size, __entry->operation_id, __entry->type, __entry->result) ); @@ -317,7 +317,7 @@ DECLARE_EVENT_CLASS(gb_interface, __entry->mode_switch = intf->mode_switch; ), - TP_printk("intf_id=%hhu device_id=%hhu module_id=%hhu D=%d J=%d A=%d E=%d M=%d", + TP_printk("intf_id=%u device_id=%u module_id=%u D=%d J=%d A=%d E=%d M=%d", __entry->id, __entry->device_id, __entry->module_id, __entry->disconnected, __entry->ejected, __entry->active, __entry->enabled, __entry->mode_switch) @@ -391,7 +391,7 @@ DECLARE_EVENT_CLASS(gb_module, __entry->disconnected = module->disconnected; ), - TP_printk("hd_bus_id=%d module_id=%hhu num_interfaces=%zu disconnected=%d", + TP_printk("hd_bus_id=%d module_id=%u num_interfaces=%zu disconnected=%d", __entry->hd_bus_id, __entry->module_id, __entry->num_interfaces, __entry->disconnected) ); -- 2.27.0

3 years, 4 months

[PATCH] staging: greybus: audio: Fix possible leak free widgets in gbaudio_dapm_free_controls

by Wang Hai

In gbaudio_dapm_free_controls(), if one of the widgets is not found, an error will be returned directly, which will cause the rest to be unable to be freed, resulting in leak. This patch fixes the bug. If if one of them is not found, just skip and free the others. Fixes: 510e340efe0c ("staging: greybus: audio: Add helper APIs for dynamic audio module") Reported-by: Hulk Robot <hulkci(a)huawei.com> Signed-off-by: Wang Hai <wanghai38(a)huawei.com> --- drivers/staging/greybus/audio_helper.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/staging/greybus/audio_helper.c b/drivers/staging/greybus/audio_helper.c index 237531ba60f3..3011b8abce38 100644 --- a/drivers/staging/greybus/audio_helper.c +++ b/drivers/staging/greybus/audio_helper.c @@ -135,7 +135,8 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, if (!w) { dev_err(dapm->dev, "%s: widget not found\n", widget->name); - return -EINVAL; + widget++; + continue; } widget++; #ifdef CONFIG_DEBUG_FS -- 2.17.1

3 years, 4 months

[PATCH v2] staging: greybus: Add TODO item about modernizing the pwm code

by Uwe Kleine-König

drivers/staging/greybus/pwm.c uses the old style PWM callbacks, new drivers should stick to the atomic API instead. Signed-off-by: Uwe Kleine-König <uwe(a)kleine-koenig.org> --- On 12/8/20 10:39 AM, Johan Hovold wrote: > No sign off? > > Please also add a staging prefix since this part of greybus still lives > there. That after all these years I still fail occasionally to add a sign-off ... /me shakes his head about himself. Anyhow, here comes a v2, also with the requested prefix. drivers/staging/greybus/TODO | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/staging/greybus/TODO b/drivers/staging/greybus/TODO index 31f1f2cb401c..6461e0132fe3 100644 --- a/drivers/staging/greybus/TODO +++ b/drivers/staging/greybus/TODO @@ -1,3 +1,5 @@ * Convert all uses of the old GPIO API from <linux/gpio.h> to the GPIO descriptor API in <linux/gpio/consumer.h> and look up GPIO lines from device tree or ACPI. +* Make pwm.c use the struct pwm_ops::apply instead of ::config, ::set_polarity, + ::enable and ::disable. -- 2.29.2

3 years, 4 months

[PATCH] greybus: Add TODO item about modernizing the pwm code

by Uwe Kleine-König

drivers/staging/greybus/pwm.c uses the old style PWM callbacks, new drivers should stick to the atomic API instead. --- drivers/staging/greybus/TODO | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/staging/greybus/TODO b/drivers/staging/greybus/TODO index 31f1f2cb401c..6461e0132fe3 100644 --- a/drivers/staging/greybus/TODO +++ b/drivers/staging/greybus/TODO @@ -1,3 +1,5 @@ * Convert all uses of the old GPIO API from <linux/gpio.h> to the GPIO descriptor API in <linux/gpio/consumer.h> and look up GPIO lines from device tree or ACPI. +* Make pwm.c use the struct pwm_ops::apply instead of ::config, ::set_polarity, + ::enable and ::disable. -- 2.29.2

3 years, 4 months

[PATCH] staging: greybus: audio: Add missing unlock in gbaudio_dapm_free_controls()

by Wang Hai

Add the missing unlock before return from function gbaudio_dapm_free_controls() in the error handling case. Fixes: 510e340efe0c ("staging: greybus: audio: Add helper APIs for dynamic audio module") Reported-by: Hulk Robot <hulkci(a)huawei.com> Signed-off-by: Wang Hai <wanghai38(a)huawei.com> --- drivers/staging/greybus/audio_helper.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/staging/greybus/audio_helper.c b/drivers/staging/greybus/audio_helper.c index 237531ba60f3..293675dbea10 100644 --- a/drivers/staging/greybus/audio_helper.c +++ b/drivers/staging/greybus/audio_helper.c @@ -135,6 +135,7 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, if (!w) { dev_err(dapm->dev, "%s: widget not found\n", widget->name); + mutex_unlock(&dapm->card->dapm_mutex); return -EINVAL; } widget++; -- 2.17.1

3 years, 4 months

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greybus-dev December 2020