From patchwork Fri Oct 18 06:33:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 13841191 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 5AD0715FD13 for ; Fri, 18 Oct 2024 06:34:01 +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=1729233241; cv=none; b=pznV+oFgB7DLosPfc5XXPcvxlasKr4tM/kg8P4LolOZwb8ahqLrVYI8B+oTnt8eIbiEZwrnpayXmXN4BjO64jMS7/9DlFl/hMTqI57M7Rm8Ido9Tu3KB67nimK8ZeM/jZFAB9ddnw6jJqf8WRvF8KlK59bh4zEfmOGwLfKz7f0s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729233241; c=relaxed/simple; bh=NQ/FL8/1bPXTvZi+dECQ5MFtHxFkdmLqMD736guOG64=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=D+pYXxlQgqkbjUl78//IQoVseyP5ypV4posdZR+gMXuJVzTjUGf2f6hE/izJZ2rw0H+5bRElb6g74SaKcROJHt+btubnX7XCRhJdkYdWbsEIdCiCktqVXLI0P/K+QjDsNh8QMiU/N+odTRsfjDRWsWMSiKJL95JZ5G3M9Fk4FLQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=loeI2BZw; 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="loeI2BZw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A1DA2C4CED1; Fri, 18 Oct 2024 06:33:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729233241; bh=NQ/FL8/1bPXTvZi+dECQ5MFtHxFkdmLqMD736guOG64=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=loeI2BZwSziNcR6DrgTk8FrvEve/RlFfdv2fEnL7GtpEsOxQcSGjoPQa9OAFaYLQY d2r2MJbNlf1P+j7v+1vyiUMgkA4se4lvBg8+ppBgpm4+gxyr30qDZ1S0kyZQY+U67C 1fN6n5Q8Lh/RPDJFtkdG4JnkoGtvriASXKtzUAr19s3n8HLLpi3DQF3wWazQ/nfPhM UYNax0lQZIC0jEMi2VdVqfCoXnaJPbuQ6cv4x6ky9fzFpM6ICxMrtfmmt1DD1W+QRR t/V9clfN6cnX2hge4eLlv57tLYylMe6A7fJJx8c1WwcjY0iFz9RelQnsL+a64v1iTf 8wJlqN7X+11XA== From: Hannes Reinecke To: Christoph Hellwig Cc: Sagi Grimberg , Keith Busch , linux-nvme@lists.infradead.org, Eric Biggers , linux-crypto@vger.kernel.org, Hannes Reinecke Subject: [PATCH 2/9] nvme: add nvme_auth_generate_psk() Date: Fri, 18 Oct 2024 08:33:36 +0200 Message-Id: <20241018063343.39798-3-hare@kernel.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20241018063343.39798-1-hare@kernel.org> References: <20241018063343.39798-1-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 generate a NVMe PSK from the shared credentials negotiated by DH-HMAC-CHAP. Signed-off-by: Hannes Reinecke Reviewed-by: Sagi Grimberg --- drivers/nvme/common/auth.c | 98 ++++++++++++++++++++++++++++++++++++++ include/linux/nvme-auth.h | 3 ++ 2 files changed, 101 insertions(+) diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c index a3455f1d67fa..32a12899d0ce 100644 --- a/drivers/nvme/common/auth.c +++ b/drivers/nvme/common/auth.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -471,5 +472,102 @@ int nvme_auth_generate_key(u8 *secret, struct nvme_dhchap_key **ret_key) } EXPORT_SYMBOL_GPL(nvme_auth_generate_key); +/** + * nvme_auth_generate_psk - Generate a PSK for TLS + * @hmac_id: Hash function identifier + * @skey: Session key + * @skey_len: Length of @skey + * @c1: Value of challenge C1 + * @c2: Value of challenge C2 + * @hash_len: Hash length of the hash algorithm + * @ret_psk: Pointer too the resulting generated PSK + * @ret_len: length of @ret_psk + * + * Generate a PSK for TLS as specified in NVMe base specification, section 8.13.5.9: + * Generated PSK for TLS + * + * The generated PSK for TLS shall be computed applying the HMAC function using the + * hash function H( ) selected by the HashID parameter in the DH-HMAC-CHAP_Challenge + * message with the session key KS as key to the concatenation of the two challenges + * C1 and C2 (i.e., generated PSK = HMAC(KS, C1 || C2)). + * + * Returns 0 on success with a valid generated PSK pointer in @ret_psk and the length + * of @ret_psk in @ret_len, or a negative error number otherwise. + */ +int nvme_auth_generate_psk(u8 hmac_id, u8 *skey, size_t skey_len, + u8 *c1, u8 *c2, size_t hash_len, u8 **ret_psk,size_t *ret_len) +{ + struct crypto_shash *tfm; + struct shash_desc *shash; + u8 *psk; + const char *hmac_name; + int ret, psk_len; + + if (!c1 || !c2) { + pr_warn("%s: invalid parameter\n", __func__); + return -EINVAL; + } + + hmac_name = nvme_auth_hmac_name(hmac_id); + if (!hmac_name) { + pr_warn("%s: invalid hash algorithm %d\n", + __func__, hmac_id); + return -EINVAL; + } + + tfm = crypto_alloc_shash(hmac_name, 0, 0); + if (IS_ERR(tfm)) + return PTR_ERR(tfm); + + psk_len = crypto_shash_digestsize(tfm); + psk = kzalloc(psk_len, GFP_KERNEL); + if (!psk) { + ret = -ENOMEM; + goto out_free_tfm; + } + + shash = kmalloc(sizeof(struct shash_desc) + + crypto_shash_descsize(tfm), + GFP_KERNEL); + if (!shash) { + ret = -ENOMEM; + goto out_free_psk; + } + + shash->tfm = tfm; + ret = crypto_shash_setkey(tfm, skey, skey_len); + if (ret) + goto out_free_shash; + + ret = crypto_shash_init(shash); + if (ret) + goto out_free_shash; + + ret = crypto_shash_update(shash, c1, hash_len); + if (ret) + goto out_free_shash; + + ret = crypto_shash_update(shash, c2, hash_len); + if (ret) + goto out_free_shash; + + ret = crypto_shash_final(shash, psk); + if (!ret) { + *ret_psk = psk; + *ret_len = psk_len; + } + +out_free_shash: + kfree_sensitive(shash); +out_free_psk: + if (ret) + kfree_sensitive(psk); +out_free_tfm: + crypto_free_shash(tfm); + + return ret; +} +EXPORT_SYMBOL_GPL(nvme_auth_generate_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 c1d0bc5d9624..b13884b04dfd 100644 --- a/include/linux/nvme-auth.h +++ b/include/linux/nvme-auth.h @@ -40,5 +40,8 @@ int nvme_auth_gen_pubkey(struct crypto_kpp *dh_tfm, int nvme_auth_gen_shared_secret(struct crypto_kpp *dh_tfm, u8 *ctrl_key, size_t ctrl_key_len, u8 *sess_key, size_t sess_key_len); +int nvme_auth_generate_psk(u8 hmac_id, u8 *skey, size_t skey_len, + u8 *c1, u8 *c2, size_t hash_len, + u8 **ret_psk, size_t *ret_len); #endif /* _NVME_AUTH_H */