From patchwork Tue Apr 30 11:51:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 793840 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CD60134402 for ; Tue, 30 Apr 2024 11:51:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714477900; cv=none; b=LvTQR742BsJ5M6BY0Ms4KB8p+VwWxQoH+yh+hoN7YY5auqz6ZZSaZIiZOSX8FVvYvnlQo9ou8TBuYcSBt1w1dDU4pvq3Sntmn8OeI+cWiIsdekwmkFrPSBL3EvQ0n6uABDxaQWgJIbd4GKPxae58ATRBMcdPnQ/8+jg+Ysu39vw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714477900; c=relaxed/simple; bh=YdEb2BqFMuvnnlPHRBBlVg+nhsKgg+HIgVo+h3zmmro=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NWoTJa0l7hMwS+dougCUz6u0m/9I/+UKb69f6TDy2IKX9XWd+kVT+8HYVqvAjwSlcCi3mbJU8TbPI/7ogq7mRav0m8BvtnNu2OuOrkdaA5am3A7UbW5wCRl57Fvh2PukdjAoTnnqfKvfAmfdt1PMa5wLl2/3qdT/BFH/Mx1E8Cw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pOW5YPnY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pOW5YPnY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E97AC2BBFC; Tue, 30 Apr 2024 11:51:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714477900; bh=YdEb2BqFMuvnnlPHRBBlVg+nhsKgg+HIgVo+h3zmmro=; h=From:List-Id:To:Cc:Subject:Date:In-Reply-To:References:From; b=pOW5YPnYp+PgNFsPI+FMrKib5buyEx6zpURN8gO8Jw7FsS17hTzU/qCiyWJPTrxtH JURiTw5yFtWPfGHYIyOPdssrlaNSe+k7DCW9sSL/AoERYE9ow/0EEGqIbiYa/yhKyw HNGsqWWxP3+3LF+vfnVv7VPBBtnxbsiPY+fQ8VAHMRt/UYONPglS+24K1ZyN8+VIRi CzpK/ARcTXHV0vFbg3RQMKlrosMheItKuTL2h9r3IT2SCVO/5jf4eFgDgoy+1OAuzO j1IQcuetY4HRdxvC7didHhTTn1nog2yVv1kXKZd2G5Vx96nWZL86Kgb+7nVJTMe+nu dSSeFgPPD0s3g== From: =?utf-8?q?Marek_Beh=C3=BAn?= To: Gregory CLEMENT , Arnd Bergmann , soc@kernel.org, arm@kernel.org, Andy Shevchenko , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Olivia Mackall , Herbert Xu , Greg Kroah-Hartman , linux-crypto@vger.kernel.org Cc: =?utf-8?q?Marek_Beh=C3=BAn?= Subject: [PATCH v8 6/9] platform: cznic: turris-omnia-mcu: Add support for MCU provided TRNG Date: Tue, 30 Apr 2024 13:51:08 +0200 Message-ID: <20240430115111.3453-7-kabel@kernel.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240430115111.3453-1-kabel@kernel.org> References: <20240430115111.3453-1-kabel@kernel.org> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add support for true random number generator provided by the MCU. New Omnia boards come without the Atmel SHA204-A chip. Instead the crypto functionality is provided by new microcontroller, which has a TRNG peripheral. Signed-off-by: Marek Behún --- drivers/platform/cznic/Kconfig | 2 + drivers/platform/cznic/Makefile | 1 + .../platform/cznic/turris-omnia-mcu-base.c | 6 +- .../platform/cznic/turris-omnia-mcu-gpio.c | 2 +- .../platform/cznic/turris-omnia-mcu-trng.c | 101 ++++++++++++++++++ drivers/platform/cznic/turris-omnia-mcu.h | 8 ++ 6 files changed, 118 insertions(+), 2 deletions(-) create mode 100644 drivers/platform/cznic/turris-omnia-mcu-trng.c diff --git a/drivers/platform/cznic/Kconfig b/drivers/platform/cznic/Kconfig index e2649cdecc38..750d5f47dba8 100644 --- a/drivers/platform/cznic/Kconfig +++ b/drivers/platform/cznic/Kconfig @@ -19,6 +19,7 @@ config TURRIS_OMNIA_MCU depends on I2C select GPIOLIB select GPIOLIB_IRQCHIP + select HW_RANDOM select RTC_CLASS select WATCHDOG_CORE help @@ -28,6 +29,7 @@ config TURRIS_OMNIA_MCU - board poweroff into true low power mode (with voltage regulators disabled) and the ability to configure wake up from this mode (via rtcwake) + - true random number generator (if available on the MCU) - MCU watchdog - GPIO pins - to get front button press events (the front button can be diff --git a/drivers/platform/cznic/Makefile b/drivers/platform/cznic/Makefile index 687f7718c0a1..eae4c6b341ff 100644 --- a/drivers/platform/cznic/Makefile +++ b/drivers/platform/cznic/Makefile @@ -4,4 +4,5 @@ obj-$(CONFIG_TURRIS_OMNIA_MCU) += turris-omnia-mcu.o turris-omnia-mcu-y := turris-omnia-mcu-base.o turris-omnia-mcu-y += turris-omnia-mcu-gpio.o turris-omnia-mcu-y += turris-omnia-mcu-sys-off-wakeup.o +turris-omnia-mcu-y += turris-omnia-mcu-trng.o turris-omnia-mcu-y += turris-omnia-mcu-watchdog.o diff --git a/drivers/platform/cznic/turris-omnia-mcu-base.c b/drivers/platform/cznic/turris-omnia-mcu-base.c index 5f88119d825c..7fe4a3df93a6 100644 --- a/drivers/platform/cznic/turris-omnia-mcu-base.c +++ b/drivers/platform/cznic/turris-omnia-mcu-base.c @@ -369,7 +369,11 @@ static int omnia_mcu_probe(struct i2c_client *client) if (err) return err; - return omnia_mcu_register_gpiochip(mcu); + err = omnia_mcu_register_gpiochip(mcu); + if (err) + return err; + + return omnia_mcu_register_trng(mcu); } static const struct of_device_id of_omnia_mcu_match[] = { diff --git a/drivers/platform/cznic/turris-omnia-mcu-gpio.c b/drivers/platform/cznic/turris-omnia-mcu-gpio.c index bcc12bd1453c..af20f8076857 100644 --- a/drivers/platform/cznic/turris-omnia-mcu-gpio.c +++ b/drivers/platform/cznic/turris-omnia-mcu-gpio.c @@ -163,7 +163,7 @@ static const struct omnia_gpio { }; /* mapping from interrupts to indexes of GPIOs in the omnia_gpios array */ -static const u8 omnia_int_to_gpio_idx[32] = { +const u8 omnia_int_to_gpio_idx[32] = { [__bf_shf(INT_CARD_DET)] = 4, [__bf_shf(INT_MSATA_IND)] = 5, [__bf_shf(INT_USB30_OVC)] = 6, diff --git a/drivers/platform/cznic/turris-omnia-mcu-trng.c b/drivers/platform/cznic/turris-omnia-mcu-trng.c new file mode 100644 index 000000000000..b85550dea4ad --- /dev/null +++ b/drivers/platform/cznic/turris-omnia-mcu-trng.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CZ.NIC's Turris Omnia MCU TRNG driver + * + * 2024 by Marek Behún + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "turris-omnia-mcu.h" + +#define CMD_TRNG_MAX_ENTROPY_LEN 64 + +static irqreturn_t omnia_trng_irq_handler(int irq, void *dev_id) +{ + struct omnia_mcu *mcu = dev_id; + + complete(&mcu->trng_completion); + + return IRQ_HANDLED; +} + +static int omnia_trng_read(struct hwrng *rng, void *data, size_t max, bool wait) +{ + struct omnia_mcu *mcu = (struct omnia_mcu *)rng->priv; + u8 reply[1 + CMD_TRNG_MAX_ENTROPY_LEN]; + int err, bytes; + + if (!wait && !completion_done(&mcu->trng_completion)) + return 0; + + do { + if (wait_for_completion_interruptible(&mcu->trng_completion)) + return -EINTR; + + err = omnia_cmd_read(mcu->client, CMD_TRNG_COLLECT_ENTROPY, + reply, sizeof(reply)); + if (err) + return err; + + bytes = min3(reply[0], max, CMD_TRNG_MAX_ENTROPY_LEN); + } while (wait && !bytes); + + memcpy(data, &reply[1], bytes); + + return bytes; +} + +int omnia_mcu_register_trng(struct omnia_mcu *mcu) +{ + struct device *dev = &mcu->client->dev; + u8 irq_idx, dummy; + int irq, err; + + if (!(mcu->features & FEAT_TRNG)) + return 0; + + irq_idx = omnia_int_to_gpio_idx[__bf_shf(INT_TRNG)]; + irq = gpiod_to_irq(gpiochip_get_desc(&mcu->gc, irq_idx)); + if (irq < 0) + return dev_err_probe(dev, irq, "Cannot get TRNG IRQ\n"); + + /* + * If someone else cleared the TRNG interrupt but did not read the + * entropy, a new interrupt won't be generated, and entropy collection + * will be stuck. Ensure an interrupt will be generated by executing + * the collect entropy command (and discarding the result). + */ + err = omnia_cmd_read(mcu->client, CMD_TRNG_COLLECT_ENTROPY, &dummy, 1); + if (err) + return err; + + init_completion(&mcu->trng_completion); + + err = devm_request_threaded_irq(dev, irq, NULL, omnia_trng_irq_handler, + IRQF_ONESHOT, "turris-omnia-mcu-trng", + mcu); + if (err) + return dev_err_probe(dev, err, "Cannot request TRNG IRQ\n"); + + mcu->trng.name = "turris-omnia-mcu-trng"; + mcu->trng.read = omnia_trng_read; + mcu->trng.priv = (unsigned long)mcu; + + err = devm_hwrng_register(dev, &mcu->trng); + if (err) + return dev_err_probe(dev, err, "Cannot register TRNG\n"); + + return 0; +} diff --git a/drivers/platform/cznic/turris-omnia-mcu.h b/drivers/platform/cznic/turris-omnia-mcu.h index 1838cb3d636e..e0cf10f8c32e 100644 --- a/drivers/platform/cznic/turris-omnia-mcu.h +++ b/drivers/platform/cznic/turris-omnia-mcu.h @@ -9,7 +9,9 @@ #define __TURRIS_OMNIA_MCU_H #include +#include #include +#include #include #include #include @@ -45,6 +47,10 @@ struct omnia_mcu { /* MCU watchdog */ struct watchdog_device wdt; + + /* true random number generator */ + struct hwrng trng; + struct completion trng_completion; }; int omnia_cmd_write_read(const struct i2c_client *client, @@ -147,11 +153,13 @@ static inline int omnia_cmd_read_u8(const struct i2c_client *client, u8 cmd) return err ?: reply; } +extern const u8 omnia_int_to_gpio_idx[32]; extern const struct attribute_group omnia_mcu_gpio_group; extern const struct attribute_group omnia_mcu_poweroff_group; int omnia_mcu_register_gpiochip(struct omnia_mcu *mcu); int omnia_mcu_register_sys_off_and_wakeup(struct omnia_mcu *mcu); +int omnia_mcu_register_trng(struct omnia_mcu *mcu); int omnia_mcu_register_watchdog(struct omnia_mcu *mcu); #endif /* __TURRIS_OMNIA_MCU_H */ From patchwork Tue Apr 30 11:51:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 793488 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 169821311B0 for ; Tue, 30 Apr 2024 11:51:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714477903; cv=none; b=JzK/azOMVx9LKJ+Jw2ukbsVOgSM5CRRFLQkUBKciYb7zBGz8EHOf+I9j4WDAsd4ej4cm77o6t4zOf4xgc7keA3jrKohir32UOanuuqNXAgvMagWk8YXKun2xAidIKoDqrQSGb3X94W1tkLmaYfFJ0GyuRVa7piuR+bA6d0fuAPA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714477903; c=relaxed/simple; bh=VWk9IDpqZL9j5JTVQIJiFEASXDYpzuUgAzCje7vo3kQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HZytMTvfqJ5mWIzRsna7ya8cckfenw5/aehwnHbXaGAwWiVNowvyJL4HJfjPoPJTmwxV6Ame/upoWmWYw9cCMexhnESXsOCy+8febI3BFuxgqRnT6Waq72l4b08PmRD/G7zky9jweZUEHQQj3H5LXy4f58SLswvhOspQX/BDbSs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tWWInF4p; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="tWWInF4p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75434C4AF1D; Tue, 30 Apr 2024 11:51:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714477902; bh=VWk9IDpqZL9j5JTVQIJiFEASXDYpzuUgAzCje7vo3kQ=; h=From:List-Id:To:Cc:Subject:Date:In-Reply-To:References:From; b=tWWInF4p4hImGO+rocc02hfx1Y4zfaX2UZSTPDciN7KOeFTJtyTEMT4L3Kya8prcm mVi1Uy7kg8+YYDn3YzM9kOaUDO2ZGwDR2nveEoOUrn+0gULiyZWvmCd5APTASUY65j 5hZjrfTrb7ngnzA7usOabQKYNimiP0ZlVv59Rqh4Hnr+W9vNc5yt2mK2JF+WxyBOcK xokM24FcNmywS9Ji/i+XxDEeCLPNpmXG2cJMQzXKcV6uOlNGnb4UCChq5Kny1MS7Gg B4O+xHEiu8tY9WVdo4cNXZGXDZvcY0Nz7wWjZ656VOsWK/KBtTnHlPw+j+q1gUeOtT HLjvFTIIdsJUg== From: =?utf-8?q?Marek_Beh=C3=BAn?= To: Gregory CLEMENT , Arnd Bergmann , soc@kernel.org, arm@kernel.org, Andy Shevchenko , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Greg Kroah-Hartman , linux-crypto@vger.kernel.org, Dan Carpenter Cc: =?utf-8?q?Marek_Beh=C3=BAn?= Subject: [PATCH v8 7/9] platform: cznic: turris-omnia-mcu: Add support for digital message signing via debugfs Date: Tue, 30 Apr 2024 13:51:09 +0200 Message-ID: <20240430115111.3453-8-kabel@kernel.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240430115111.3453-1-kabel@kernel.org> References: <20240430115111.3453-1-kabel@kernel.org> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add support for digital message signing with private key stored in the MCU. Boards with MKL MCUs have a NIST256p ECDSA private key created when manufactured. The private key is not readable from the MCU, but MCU allows for signing messages with it and retrieving the public key. As described in a similar commit 50524d787de3 ("firmware: turris-mox-rwtm: support ECDSA signatures via debugfs"): The optimal solution would be to register an akcipher provider via kernel's crypto API, but crypto API does not yet support accessing akcipher API from userspace (and probably won't for some time, see https://www.spinics.net/lists/linux-crypto/msg38388.html). Therefore we add support for accessing this signature generation mechanism via debugfs for now, so that userspace can access it. Signed-off-by: Marek Behún --- .../ABI/testing/debugfs-turris-omnia-mcu | 13 ++ .../sysfs-bus-i2c-devices-turris-omnia-mcu | 13 ++ MAINTAINERS | 1 + drivers/platform/cznic/Kconfig | 2 + drivers/platform/cznic/Makefile | 1 + .../platform/cznic/turris-omnia-mcu-base.c | 45 +++- .../platform/cznic/turris-omnia-mcu-debugfs.c | 207 ++++++++++++++++++ drivers/platform/cznic/turris-omnia-mcu.h | 23 ++ 8 files changed, 304 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/debugfs-turris-omnia-mcu create mode 100644 drivers/platform/cznic/turris-omnia-mcu-debugfs.c diff --git a/Documentation/ABI/testing/debugfs-turris-omnia-mcu b/Documentation/ABI/testing/debugfs-turris-omnia-mcu new file mode 100644 index 000000000000..1665005c2dcd --- /dev/null +++ b/Documentation/ABI/testing/debugfs-turris-omnia-mcu @@ -0,0 +1,13 @@ +What: /sys/kernel/debug/turris-omnia-mcu/do_sign +Date: July 2024 +KernelVersion: 6.10 +Contact: Marek Behún +Description: + + ======= =========================================================== + (Write) Message to sign with the ECDSA private key stored in MCU. + The message must be exactly 32 bytes long (since this is + intended to be a SHA-256 hash). + (Read) The resulting signature, 64 bytes. This contains the R and + S values of the ECDSA signature, both in big-endian format. + ======= =========================================================== diff --git a/Documentation/ABI/testing/sysfs-bus-i2c-devices-turris-omnia-mcu b/Documentation/ABI/testing/sysfs-bus-i2c-devices-turris-omnia-mcu index 564119849388..b239224cf9bc 100644 --- a/Documentation/ABI/testing/sysfs-bus-i2c-devices-turris-omnia-mcu +++ b/Documentation/ABI/testing/sysfs-bus-i2c-devices-turris-omnia-mcu @@ -90,6 +90,19 @@ Description: (RO) Contains the microcontroller type (STM32, GD32, MKL). Format: %s. +What: /sys/bus/i2c/devices//public_key +Date: July 2024 +KernelVersion: 6.10 +Contact: Marek Behún +Description: (RO) Contains board ECDSA public key. + + Only available if MCU supports signing messages with the ECDSA + algorithm. If so, the board has a private key stored in the MCU + that was generated during manufacture and cannot be retrieved + from the MCU. + + Format: %s. + What: /sys/bus/i2c/devices//reset_selector Date: July 2024 KernelVersion: 6.10 diff --git a/MAINTAINERS b/MAINTAINERS index 2aa178a9d53e..ecc5aed0a968 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2139,6 +2139,7 @@ M: Marek Behún S: Maintained W: https://www.turris.cz/ F: Documentation/ABI/testing/debugfs-moxtet +F: Documentation/ABI/testing/debugfs-turris-omnia-mcu F: Documentation/ABI/testing/sysfs-bus-i2c-devices-turris-omnia-mcu F: Documentation/ABI/testing/sysfs-bus-moxtet-devices F: Documentation/ABI/testing/sysfs-firmware-turris-mox-rwtm diff --git a/drivers/platform/cznic/Kconfig b/drivers/platform/cznic/Kconfig index 750d5f47dba8..2d45495c0a2d 100644 --- a/drivers/platform/cznic/Kconfig +++ b/drivers/platform/cznic/Kconfig @@ -30,6 +30,8 @@ config TURRIS_OMNIA_MCU disabled) and the ability to configure wake up from this mode (via rtcwake) - true random number generator (if available on the MCU) + - ECDSA message signing with board private key (if available on the + MCU) - MCU watchdog - GPIO pins - to get front button press events (the front button can be diff --git a/drivers/platform/cznic/Makefile b/drivers/platform/cznic/Makefile index eae4c6b341ff..af9213928404 100644 --- a/drivers/platform/cznic/Makefile +++ b/drivers/platform/cznic/Makefile @@ -6,3 +6,4 @@ turris-omnia-mcu-y += turris-omnia-mcu-gpio.o turris-omnia-mcu-y += turris-omnia-mcu-sys-off-wakeup.o turris-omnia-mcu-y += turris-omnia-mcu-trng.o turris-omnia-mcu-y += turris-omnia-mcu-watchdog.o +turris-omnia-mcu-$(CONFIG_DEBUG_FS) += turris-omnia-mcu-debugfs.o diff --git a/drivers/platform/cznic/turris-omnia-mcu-base.c b/drivers/platform/cznic/turris-omnia-mcu-base.c index 7fe4a3df93a6..ec08443551a7 100644 --- a/drivers/platform/cznic/turris-omnia-mcu-base.c +++ b/drivers/platform/cznic/turris-omnia-mcu-base.c @@ -159,6 +159,16 @@ static ssize_t board_revision_show(struct device *dev, } static DEVICE_ATTR_RO(board_revision); +static ssize_t public_key_show(struct device *dev, struct device_attribute *a, + char *buf) +{ + struct omnia_mcu *mcu = i2c_get_clientdata(to_i2c_client(dev)); + + return sysfs_emit(buf, "%*phN\n", OMNIA_MCU_CRYPTO_PUBLIC_KEY_LEN, + mcu->board_public_key); +} +static DEVICE_ATTR_RO(public_key); + static struct attribute *omnia_mcu_base_attrs[] = { &dev_attr_fw_version_hash_application.attr, &dev_attr_fw_version_hash_bootloader.attr, @@ -168,6 +178,7 @@ static struct attribute *omnia_mcu_base_attrs[] = { &dev_attr_serial_number.attr, &dev_attr_first_mac_address.attr, &dev_attr_board_revision.attr, + &dev_attr_public_key.attr, NULL }; @@ -183,6 +194,9 @@ static umode_t omnia_mcu_base_attrs_visible(struct kobject *kobj, a == &dev_attr_board_revision.attr) && !(mcu->features & FEAT_BOARD_INFO)) mode = 0; + else if (a == &dev_attr_public_key.attr && + !(mcu->features & FEAT_CRYPTO)) + mode = 0; return mode; } @@ -333,6 +347,24 @@ static int omnia_mcu_read_board_info(struct omnia_mcu *mcu) return 0; } +static int omnia_mcu_read_public_key(struct omnia_mcu *mcu) +{ + u8 reply[1 + OMNIA_MCU_CRYPTO_PUBLIC_KEY_LEN]; + int err; + + err = omnia_cmd_read(mcu->client, CMD_CRYPTO_GET_PUBLIC_KEY, reply, + sizeof(reply)); + if (err) + return err; + + if (reply[0] != OMNIA_MCU_CRYPTO_PUBLIC_KEY_LEN) + return -EIO; + + memcpy(mcu->board_public_key, &reply[1], sizeof(mcu->board_public_key)); + + return 0; +} + static int omnia_mcu_probe(struct i2c_client *client) { struct device *dev = &client->dev; @@ -361,6 +393,13 @@ static int omnia_mcu_probe(struct i2c_client *client) "Cannot read board info\n"); } + if (mcu->features & FEAT_CRYPTO) { + err = omnia_mcu_read_public_key(mcu); + if (err) + return dev_err_probe(dev, err, + "Cannot read board public key\n"); + } + err = omnia_mcu_register_sys_off_and_wakeup(mcu); if (err) return err; @@ -373,7 +412,11 @@ static int omnia_mcu_probe(struct i2c_client *client) if (err) return err; - return omnia_mcu_register_trng(mcu); + err = omnia_mcu_register_trng(mcu); + if (err) + return err; + + return omnia_mcu_register_debugfs(mcu); } static const struct of_device_id of_omnia_mcu_match[] = { diff --git a/drivers/platform/cznic/turris-omnia-mcu-debugfs.c b/drivers/platform/cznic/turris-omnia-mcu-debugfs.c new file mode 100644 index 000000000000..67dc02a442d8 --- /dev/null +++ b/drivers/platform/cznic/turris-omnia-mcu-debugfs.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CZ.NIC's Turris Omnia MCU ECDSA message signing via debugfs + * + * 2024 by Marek Behún + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "turris-omnia-mcu.h" + +#define CMD_CRYPTO_SIGN_MESSAGE_LEN 32 + +enum { + SIGN_STATE_CLOSED = 0, + SIGN_STATE_OPEN = 1, + SIGN_STATE_REQUESTED = 2, + SIGN_STATE_COLLECTED = 3, +}; + +static irqreturn_t omnia_msg_signed_irq_handler(int irq, void *dev_id) +{ + u8 reply[1 + OMNIA_MCU_CRYPTO_SIGNATURE_LEN]; + struct omnia_mcu *mcu = dev_id; + int err; + + err = omnia_cmd_read(mcu->client, CMD_CRYPTO_COLLECT_SIGNATURE, reply, + sizeof(reply)); + if (!err && reply[0] != OMNIA_MCU_CRYPTO_SIGNATURE_LEN) + err = -EIO; + + guard(mutex)(&mcu->sign_lock); + + if (mcu->sign_state == SIGN_STATE_REQUESTED) { + mcu->sign_err = err; + if (!err) + memcpy(mcu->signature, &reply[1], + OMNIA_MCU_CRYPTO_SIGNATURE_LEN); + mcu->sign_state = SIGN_STATE_COLLECTED; + complete(&mcu->msg_signed_completion); + } + + return IRQ_HANDLED; +} + +static int do_sign_open(struct inode *inode, struct file *file) +{ + struct omnia_mcu *mcu = inode->i_private; + + guard(mutex)(&mcu->sign_lock); + + /* do_sign is allowed to be opened only once */ + if (mcu->sign_state != SIGN_STATE_CLOSED) + return -EBUSY; + + mcu->sign_state = SIGN_STATE_OPEN; + + file->private_data = mcu; + + return nonseekable_open(inode, file); +} + +static int do_sign_release(struct inode *inode, struct file *file) +{ + struct omnia_mcu *mcu = file->private_data; + + guard(mutex)(&mcu->sign_lock); + + mcu->sign_state = SIGN_STATE_CLOSED; + + /* forget signature on release even if it was not read, for security */ + memzero_explicit(mcu->signature, sizeof(mcu->signature)); + + return 0; +} + +static ssize_t do_sign_read(struct file *file, char __user *buf, size_t len, + loff_t *ppos) +{ + struct omnia_mcu *mcu = file->private_data; + + /* only allow read of one whole signature */ + if (len != sizeof(mcu->signature)) + return -EINVAL; + + scoped_guard(mutex, &mcu->sign_lock) + if (mcu->sign_state != SIGN_STATE_REQUESTED && + mcu->sign_state != SIGN_STATE_COLLECTED) + return -ENODATA; + + if (wait_for_completion_interruptible(&mcu->msg_signed_completion)) + return -EINTR; + + guard(mutex)(&mcu->sign_lock); + + mcu->sign_state = SIGN_STATE_OPEN; + + if (mcu->sign_err) + return mcu->sign_err; + + if (copy_to_user(buf, mcu->signature, len)) + return -EFAULT; + + /* on read forget the signature, for security */ + memzero_explicit(mcu->signature, sizeof(mcu->signature)); + + return len; +} + +static ssize_t do_sign_write(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + u8 cmd[1 + CMD_CRYPTO_SIGN_MESSAGE_LEN], reply; + struct omnia_mcu *mcu = file->private_data; + int err; + + /* + * the input is a SHA-256 hash of a message to sign, so exactly + * 32 bytes have to be read + */ + if (len != CMD_CRYPTO_SIGN_MESSAGE_LEN) + return -EINVAL; + + cmd[0] = CMD_CRYPTO_SIGN_MESSAGE; + + if (copy_from_user(&cmd[1], buf, len)) + return -EFAULT; + + guard(mutex)(&mcu->sign_lock); + + if (mcu->sign_state != SIGN_STATE_OPEN) + return -EBUSY; + + err = omnia_cmd_write_read(mcu->client, cmd, sizeof(cmd), &reply, 1); + if (err) + return err; + + if (reply) + mcu->sign_state = SIGN_STATE_REQUESTED; + + return reply ? len : -EBUSY; +} + +static const struct file_operations do_sign_fops = { + .owner = THIS_MODULE, + .open = do_sign_open, + .read = do_sign_read, + .write = do_sign_write, + .release = do_sign_release, + .llseek = no_llseek, +}; + +static void omnia_debugfs_drop_dir(void *res) +{ + debugfs_remove_recursive(res); +} + +int omnia_mcu_register_debugfs(struct omnia_mcu *mcu) +{ + struct device *dev = &mcu->client->dev; + struct dentry *root; + int irq, err; + u8 irq_idx; + + if (!(mcu->features & FEAT_CRYPTO)) + return 0; + + irq_idx = omnia_int_to_gpio_idx[__bf_shf(INT_MESSAGE_SIGNED)]; + irq = gpiod_to_irq(gpiochip_get_desc(&mcu->gc, irq_idx)); + if (irq < 0) + return dev_err_probe(dev, irq, + "Cannot get MESSAGE_SIGNED IRQ\n"); + + err = devm_mutex_init(dev, &mcu->sign_lock); + if (err) + return err; + + mcu->sign_state = 0; + + init_completion(&mcu->msg_signed_completion); + + err = devm_request_threaded_irq(dev, irq, NULL, + omnia_msg_signed_irq_handler, + IRQF_ONESHOT, + "turris-omnia-mcu-debugfs", mcu); + if (err) + return dev_err_probe(dev, err, + "Cannot request MESSAGE_SIGNED IRQ\n"); + + root = debugfs_create_dir("turris-omnia-mcu", NULL); + debugfs_create_file_unsafe("do_sign", 0600, root, mcu, &do_sign_fops); + + return devm_add_action_or_reset(dev, omnia_debugfs_drop_dir, root); +} diff --git a/drivers/platform/cznic/turris-omnia-mcu.h b/drivers/platform/cznic/turris-omnia-mcu.h index e0cf10f8c32e..5ce639d5ec67 100644 --- a/drivers/platform/cznic/turris-omnia-mcu.h +++ b/drivers/platform/cznic/turris-omnia-mcu.h @@ -21,6 +21,9 @@ #include #include +#define OMNIA_MCU_CRYPTO_PUBLIC_KEY_LEN 33 +#define OMNIA_MCU_CRYPTO_SIGNATURE_LEN 64 + struct omnia_mcu { struct i2c_client *client; const char *type; @@ -30,6 +33,7 @@ struct omnia_mcu { u64 board_serial_number; u8 board_first_mac[ETH_ALEN]; u8 board_revision; + u8 board_public_key[OMNIA_MCU_CRYPTO_PUBLIC_KEY_LEN]; /* GPIO chip */ struct gpio_chip gc; @@ -51,6 +55,16 @@ struct omnia_mcu { /* true random number generator */ struct hwrng trng; struct completion trng_completion; + +#ifdef CONFIG_DEBUG_FS + /* MCU ECDSA message signing via debugfs */ + struct dentry *debugfs_root; + struct completion msg_signed_completion; + struct mutex sign_lock; + unsigned int sign_state; + u8 signature[OMNIA_MCU_CRYPTO_SIGNATURE_LEN]; + int sign_err; +#endif }; int omnia_cmd_write_read(const struct i2c_client *client, @@ -162,4 +176,13 @@ int omnia_mcu_register_sys_off_and_wakeup(struct omnia_mcu *mcu); int omnia_mcu_register_trng(struct omnia_mcu *mcu); int omnia_mcu_register_watchdog(struct omnia_mcu *mcu); +#ifdef CONFIG_DEBUG_FS +int omnia_mcu_register_debugfs(struct omnia_mcu *mcu); +#else +static inline int omnia_mcu_register_debugfs(struct omnia_mcu *mcu) +{ + return 0; +} +#endif + #endif /* __TURRIS_OMNIA_MCU_H */