From patchwork Mon Jul 22 14:21:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 814036 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 DFB9A16D4DF for ; Mon, 22 Jul 2024 14:22:09 +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=1721658130; cv=none; b=jwsu+qwTIclhdJPbPasFuOQ8vDli07B5rRjOAfc1yqIHgTDLtc2lTlwf/GJ2LfLtNqRRNrP1Ze9+qNYA+LnKKQ5XPT6SlMXk1nFlt9ooO6l8Wo24AFb4sdY/ambpy7hGcLw90Nq9bgdXGo1B6WQBBk+qgbu5wNPYlPAxzLsa3t4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721658130; c=relaxed/simple; bh=28iWTpGgJQZACHrKP438Mo3qa8pSKYOIzwL8Ms+F4hQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=rY7DDBp5scqb77+WIPgPcm3mX3NfGf96vGYR9h2Cag6GJfm6bVgq/ix3sQJecnFzHV/938U5RvMHokVcwJQk20rJXb1DuiQAQa5PE8gO4vQ/HkTuAqfnDwK8pJKqgERf4RIDUK83gxJAgArj40W8htcj7S4cPFxqJpPlUcAfOrA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=q1sq4xzi; 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="q1sq4xzi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAE59C4AF0E; Mon, 22 Jul 2024 14:22:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1721658129; bh=28iWTpGgJQZACHrKP438Mo3qa8pSKYOIzwL8Ms+F4hQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q1sq4xzigjqUrzySdY9Uhqbak5NOxXW7ye7gRuzZq8Ng4aU8jqNgiLvD1WHp7x/Gl X6o/MtbJs5E6kH0Ebxe/QAIwXzGpMikEtLC87RJvvc7ks06gjusoQmhfTYFy+AxdBE JOvfkcz1Vdg7mBIxbPtr9QPOSrikkUyGOOSv5heizdh/irQrcQSEvu+pYxfaMha1ww 1khkMwRUFg+54denOqicUXi82guw+1KX93lMDuSLKzJFOb3U+34Yj7G1iAgYXlQyv+ lWt493bLfR5orjn3gPsvmmq8KVLWPiDVLBp+k6mBbMqI3rs/4E7SFpLKvbFBQz8NXf bvh+RZKUfduyQ== From: Hannes Reinecke To: Christoph Hellwig Cc: Keith Busch , Sagi Grimberg , Eric Biggers , linux-crypto@vger.kernel.org, linux-nvme@lists.infradead.org, Hannes Reinecke Subject: [PATCH 4/9] nvme: add nvme_auth_derive_tls_psk() Date: Mon, 22 Jul 2024 16:21:17 +0200 Message-Id: <20240722142122.128258-5-hare@kernel.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240722142122.128258-1-hare@kernel.org> References: <20240722142122.128258-1-hare@kernel.org> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a function to derive the TLS PSK as specified TP8018. Signed-off-by: Hannes Reinecke Reviewed-by: Sagi Grimberg --- drivers/nvme/common/auth.c | 90 ++++++++++++++++++++++++++++++++++++++ include/linux/nvme-auth.h | 2 + 2 files changed, 92 insertions(+) diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c index 7e40f205d3e4..0b000a562c0f 100644 --- a/drivers/nvme/common/auth.c +++ b/drivers/nvme/common/auth.c @@ -684,5 +684,95 @@ int nvme_auth_generate_digest(u8 hmac_id, u8 *psk, size_t psk_len, } EXPORT_SYMBOL_GPL(nvme_auth_generate_digest); +/* + * Derive a TLS PSK as specified in TP8018 Section 3.6.1.3: + * TLS PSK and PSK identity Derivation + * + * The TLS PSK shall be derived as follows from an input PSK + * (i.e., either a retained PSK or a generated PSK) and a PSK + * identity using the HKDF-Extract and HKDF-Expand-Label operations + * (refer to RFC 5869 and RFC 8446) where the hash function is the + * one specified by the hash specifier of the PSK identity: + * 1. PRK = HKDF-Extract(0, Input PSK); and + * 2. TLS PSK = HKDF-Expand-Label(PRK, "nvme-tls-psk", PskIdentityContext, L), + * where PskIdentityContext is the hash identifier indicated in + * the PSK identity concatenated to a space character and to the + * Base64 PSK digest (i.e., " ") and L is the + * output size in bytes of the hash function (i.e., 32 for SHA-256 + * and 48 for SHA-384). + */ +int nvme_auth_derive_tls_psk(int hmac_id, u8 *psk, size_t psk_len, + u8 *psk_digest, u8 **ret_psk) +{ + struct crypto_shash *hmac_tfm; + const char *hmac_name; + const char *psk_prefix = "tls13 nvme-tls-psk"; + size_t info_len, prk_len; + char *info; + unsigned char *prk, *tls_key; + int ret; + + hmac_name = nvme_auth_hmac_name(hmac_id); + if (!hmac_name) { + pr_warn("%s: invalid hash algoritm %d\n", + __func__, hmac_id); + return -EINVAL; + } + if (hmac_id == NVME_AUTH_HASH_SHA512) { + pr_warn("%s: unsupported hash algorithm %s\n", + __func__, hmac_name); + return -EINVAL; + } + + hmac_tfm = crypto_alloc_shash(hmac_name, 0, 0); + if (IS_ERR(hmac_tfm)) + return PTR_ERR(hmac_tfm); + + prk_len = crypto_shash_digestsize(hmac_tfm); + prk = kzalloc(prk_len, GFP_KERNEL); + if (!prk) { + ret = -ENOMEM; + goto out_free_shash; + } + + ret = hkdf_extract(hmac_tfm, psk, psk_len, prk); + if (ret) + goto out_free_prk; + + ret = crypto_shash_setkey(hmac_tfm, prk, prk_len); + if (ret) + goto out_free_prk; + + info_len = strlen(psk_digest) + strlen(psk_prefix) + 1; + info = kzalloc(info_len, GFP_KERNEL); + if (!info) + goto out_free_prk; + + memcpy(info, psk_prefix, strlen(psk_prefix)); + memcpy(info + strlen(psk_prefix), psk_digest, strlen(psk_digest)); + + tls_key = kzalloc(psk_len, GFP_KERNEL); + if (!tls_key) { + ret = -ENOMEM; + goto out_free_info; + } + ret = hkdf_expand(hmac_tfm, info, strlen(info), tls_key, psk_len); + if (ret) { + kfree(tls_key); + goto out_free_info; + } + *ret_psk = tls_key; + +out_free_info: + kfree(info); +out_free_prk: + kfree(prk); +out_free_shash: + crypto_free_shash(hmac_tfm); + + return ret; +} +EXPORT_SYMBOL_GPL(nvme_auth_derive_tls_psk); + MODULE_DESCRIPTION("NVMe Authentication framework"); MODULE_LICENSE("GPL v2"); diff --git a/include/linux/nvme-auth.h b/include/linux/nvme-auth.h index 998f06bf10fd..60e069a6757f 100644 --- a/include/linux/nvme-auth.h +++ b/include/linux/nvme-auth.h @@ -45,5 +45,7 @@ int nvme_auth_generate_psk(u8 hmac_id, u8 *skey, size_t skey_len, u8 **ret_psk, size_t *ret_len); int nvme_auth_generate_digest(u8 hmac_id, u8 *psk, size_t psk_len, char *subsysnqn, char *hostnqn, u8 **ret_digest); +int nvme_auth_derive_tls_psk(int hmac_id, u8 *psk, size_t psk_len, + u8 *psk_digest, u8 **ret_psk); #endif /* _NVME_AUTH_H */