From patchwork Tue Aug 13 11:15:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 13761823 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 1C6512233A for ; Tue, 13 Aug 2024 11:15:36 +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=1723547737; cv=none; b=YNDThI7YyNj+Ffcf3jQfJFvYcvhr+1Zv66hRlsEBcIo7LiLSA5U1/UIBDxoEmGSY1UwNoc+gFMazKRr1QuALOMr0qgWOwnBqyLfwFVpTK5UUTxPk2PV/hE7KoDztIvD14py95JNIc9FxmVSmfB7X0pXCpRCQPGQD0y+r/snh8XU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723547737; c=relaxed/simple; bh=ruExrBFJbkteI8AexloKYOBxLwCIA/w7aZ9Dzbua6K8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=C9ngPpnim1VLwGlyKG9aMG6vR8ZWmM0LQPbJckmjIUXfr2Nw7n6/P/SFMHBCp8TS5wRl4b/7pwo/S6eixLUpJU4RF9zxqzlUAo/OlSY5iKBI34J6v8bNtOc+RlzbSGE5p8eeJkLsr4BvhFBOKJmZAcl1KOAWaWYbjl2BG0lnP18= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KfJ1oOj+; 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="KfJ1oOj+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00B78C4AF09; Tue, 13 Aug 2024 11:15:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723547736; bh=ruExrBFJbkteI8AexloKYOBxLwCIA/w7aZ9Dzbua6K8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KfJ1oOj+Opu9K3Lgk1mtYWTgOacJI3JYviygIabiKxjHGPAiDSRBF29z/rMWkogQE r+Pv4pfwhus/zDkd8bPx4mPwI6ztrbRw4Cwhs6qYxMTP6bGnRikt45yPvOo2iBGizh Mjt8sfjIa19ZMzOkCLYVHm2f4cfgaDB+euECoAuYVTwPpu3hvI8Tvwul0497yQr7X9 frEZKxiAPKxny1S7gqqcD3X496Y24D16Nch/6pt269Q4HhVvo6yatf2WzuOkiMj+ZA SkPqyT7qUR7z2st1OBTtuhJugP9hMeYKHYSsSUG809tApyazZ1/w//rZJZP+rrrOng nkdWQ2DAfUe4g== 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 3/9] nvme: add nvme_auth_generate_digest() Date: Tue, 13 Aug 2024 13:15:06 +0200 Message-Id: <20240813111512.135634-4-hare@kernel.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240813111512.135634-1-hare@kernel.org> References: <20240813111512.135634-1-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 | 137 +++++++++++++++++++++++++++++++++++++ include/linux/nvme-auth.h | 2 + 2 files changed, 139 insertions(+) diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c index 8448bd195ff1..d04d966fd19c 100644 --- a/drivers/nvme/common/auth.c +++ b/drivers/nvme/common/auth.c @@ -569,5 +569,142 @@ 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, *hmac; + 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 algoritm %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; + } + + hmac = kzalloc(hmac_len + 1, GFP_KERNEL); + if (!hmac) + return -ENOMEM; + + tfm = crypto_alloc_shash(hmac_name, 0, 0); + if (IS_ERR(tfm)) { + ret = PTR_ERR(tfm); + goto out_free_hmac; + } + + 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, hmac); + if (ret < hmac_len) + ret = -ENOKEY; + *ret_digest = hmac; + ret = 0; + +out_free_shash: + kfree_sensitive(shash); +out_free_digest: + kfree_sensitive(digest); +out_free_tfm: + crypto_free_shash(tfm); +out_free_hmac: + if (ret) + kfree_sensitive(hmac); + + 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 */