From patchwork Mon Dec 2 14:29:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 847435 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 79F0F2040A8 for ; Mon, 2 Dec 2024 14:30:17 +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=1733149817; cv=none; b=QAZhlEdOmhxBxEdHCIPRnl6durmscL8zpF0Ew3FzBXTTZW6kVpwthZCf84yZ6D9/crTrWb7UHZYaN5P6UBew2mZboTY35peMJthzKN8vxU004LNWIQ4GoDhQRskBzvyWm521eUXC99DvPu+Tl6tNr8dwtmbceFv2yLZ28dymFv0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733149817; c=relaxed/simple; bh=jwlr/5+5ZVXdbOrphmnRpwYJ3n9luVUs28OrzimGc1k=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HXCaQegYyqg7mGeSdKM73qmiGRs7yib3q5zTvnrgGCxs83zm/+fgZGQ7ESLzT+/YRUXLUwnuw+pCxXi/MJNtiAAMFfEc2waW0UWoOWb2u2u1H/JwjhdbX5eYqhqKs9ChptuQzldl4BZfvtNGNUFuxLpl3QXs2fPomKVyhOy+8SY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rHklCzvT; 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="rHklCzvT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64EFEC4CED1; Mon, 2 Dec 2024 14:30:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733149817; bh=jwlr/5+5ZVXdbOrphmnRpwYJ3n9luVUs28OrzimGc1k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rHklCzvT/ex1PTaxdriA5eSXpgrEstnGe1chcNrbwr9/yMXuwuPSWXQ7+bStyKjdQ WB4O//V1tVTL4NKENnnyznSqVr8/CgFot/nd4CmLDlAm6aUPo3Bw28PW4vvB/DMxjB BqGWl7O3XZOw6RHoSoYK0EoZ3dezAO4xHLAdtOho3wyLZJuMYZ7dwvjp323PPMxerd IC77lwZZpAMd1fPsr+xAA8X37lNz7bxNTKqHM0NsTAIReun5zxyUf2cb04bavm+bTg 5qgKJLNy6rpfQpaOG4uJiiTJAm3BoBgojKf9In/H7Py9EcXSplj0ddAtenljuWO1YW 19YoK3F7rDcFA== From: Hannes Reinecke To: Christoph Hellwig Cc: Keith Busch , Sagi Grimberg , linux-nvme@lists.infradead.org, Eric Biggers , linux-crypto@vger.kernel.org, Hannes Reinecke Subject: [PATCH 03/10] nvme: add nvme_auth_generate_digest() Date: Mon, 2 Dec 2024 15:29:52 +0100 Message-Id: <20241202142959.81321-4-hare@kernel.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20241202142959.81321-1-hare@kernel.org> References: <20241202142959.81321-1-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 calculate the PSK digest as specified in TP8018. Signed-off-by: Hannes Reinecke Reviewed-by: Sagi Grimberg --- drivers/nvme/common/auth.c | 139 +++++++++++++++++++++++++++++++++++++ include/linux/nvme-auth.h | 2 + 2 files changed, 141 insertions(+) diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c index 32a12899d0ce..12ce9125693f 100644 --- a/drivers/nvme/common/auth.c +++ b/drivers/nvme/common/auth.c @@ -569,5 +569,144 @@ int nvme_auth_generate_psk(u8 hmac_id, u8 *skey, size_t skey_len, } EXPORT_SYMBOL_GPL(nvme_auth_generate_psk); +/** + * nvme_auth_generate_digest - Generate TLS PSK digest + * @hmac_id: Hash function identifier + * @psk: Generated input PSK + * @psk_len: Lenght of @psk + * @subsysnqn: NQN of the subsystem + * @hostnqn: NQN of the host + * @ret_digest: Pointer to the returned digest + * + * Generate a TLS PSK digest as specified in TP8018 Section 3.6.1.3: + * TLS PSK and PSK identity Derivation + * + * The PSK digest shall be computed by encoding in Base64 (refer to RFC 4648) + * the result of the application of the HMAC function using the hash function + * specified in item 4 above (ie the hash function of the cipher suite associated + * with the PSK identity) with the PSK as HMAC key to the concatenation of: + * - the NQN of the host (i.e., NQNh) not including the null terminator; + * - a space character; + * - the NQN of the NVM subsystem (i.e., NQNc) not including the null terminator; + * - a space character; and + * - the seventeen ASCII characters "NVMe-over-Fabrics" + * (i.e., = Base64(HMAC(PSK, NQNh || " " || NQNc || " " || "NVMe-over-Fabrics"))). + * The length of the PSK digest depends on the hash function used to compute + * it as follows: + * - If the SHA-256 hash function is used, the resulting PSK digest is 44 characters long; or + * - If the SHA-384 hash function is used, the resulting PSK digest is 64 characters long. + * + * Returns 0 on success with a valid digest pointer in @ret_digest, or a negative + * error number on failure. + */ +int nvme_auth_generate_digest(u8 hmac_id, u8 *psk, size_t psk_len, + char *subsysnqn, char *hostnqn, u8 **ret_digest) +{ + struct crypto_shash *tfm; + struct shash_desc *shash; + u8 *digest, *enc; + const char *hmac_name; + size_t digest_len, hmac_len; + int ret; + + if (WARN_ON(!subsysnqn || !hostnqn)) + 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; + } + + switch (nvme_auth_hmac_hash_len(hmac_id)) { + case 32: + hmac_len = 44; + break; + case 48: + hmac_len = 64; + break; + default: + pr_warn("%s: invalid hash algorithm '%s'\n", + __func__, hmac_name); + return -EINVAL; + } + + enc = kzalloc(hmac_len + 1, GFP_KERNEL); + if (!enc) + return -ENOMEM; + + tfm = crypto_alloc_shash(hmac_name, 0, 0); + if (IS_ERR(tfm)) { + ret = PTR_ERR(tfm); + goto out_free_enc; + } + + digest_len = crypto_shash_digestsize(tfm); + digest = kzalloc(digest_len, GFP_KERNEL); + if (!digest) { + 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_digest; + } + + shash->tfm = tfm; + ret = crypto_shash_setkey(tfm, psk, psk_len); + if (ret) + goto out_free_shash; + + ret = crypto_shash_init(shash); + if (ret) + goto out_free_shash; + + ret = crypto_shash_update(shash, hostnqn, strlen(hostnqn)); + if (ret) + goto out_free_shash; + + ret = crypto_shash_update(shash, " ", 1); + if (ret) + goto out_free_shash; + + ret = crypto_shash_update(shash, subsysnqn, strlen(subsysnqn)); + if (ret) + goto out_free_shash; + + ret = crypto_shash_update(shash, " NVMe-over-Fabrics", 18); + if (ret) + goto out_free_shash; + + ret = crypto_shash_final(shash, digest); + if (ret) + goto out_free_shash; + + ret = base64_encode(digest, digest_len, enc); + if (ret < hmac_len) + ret = -ENOKEY; + else { + *ret_digest = enc; + ret = 0; + } + +out_free_shash: + kfree_sensitive(shash); +out_free_digest: + kfree_sensitive(digest); +out_free_tfm: + crypto_free_shash(tfm); +out_free_enc: + if (ret) + kfree_sensitive(enc); + + return ret; +} +EXPORT_SYMBOL_GPL(nvme_auth_generate_digest); + MODULE_DESCRIPTION("NVMe Authentication framework"); MODULE_LICENSE("GPL v2"); diff --git a/include/linux/nvme-auth.h b/include/linux/nvme-auth.h index b13884b04dfd..998f06bf10fd 100644 --- a/include/linux/nvme-auth.h +++ b/include/linux/nvme-auth.h @@ -43,5 +43,7 @@ int nvme_auth_gen_shared_secret(struct crypto_kpp *dh_tfm, 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); +int nvme_auth_generate_digest(u8 hmac_id, u8 *psk, size_t psk_len, + char *subsysnqn, char *hostnqn, u8 **ret_digest); #endif /* _NVME_AUTH_H */