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Miller" , linux-nvme@lists.infradead.org, linux-crypto@vger.kernel.org, Hannes Reinecke Subject: [PATCH 11/12] nvmet-auth: Diffie-Hellman key exchange support Date: Tue, 28 Sep 2021 08:03:55 +0200 Message-Id: <20210928060356.27338-12-hare@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210928060356.27338-1-hare@suse.de> References: <20210928060356.27338-1-hare@suse.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210927_230415_944796_A0AB2FCF X-CRM114-Status: GOOD ( 24.02 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Implement Diffie-Hellman key exchange using FFDHE groups for NVMe In-Band Authentication. This patch adds a new host configfs attribute 'dhchap_dhgroup' to select the FFDHE group to use. Signed-off-by: Hannes Reinecke --- drivers/nvme/target/Kconfig | 1 + drivers/nvme/target/auth.c | 148 ++++++++++++++++++++++++- drivers/nvme/target/configfs.c | 31 ++++++ drivers/nvme/target/fabrics-cmd-auth.c | 31 +++++- drivers/nvme/target/nvmet.h | 6 + 5 files changed, 209 insertions(+), 8 deletions(-) diff --git a/drivers/nvme/target/Kconfig b/drivers/nvme/target/Kconfig index 70f3c385fc9f..2e41d70fd881 100644 --- a/drivers/nvme/target/Kconfig +++ b/drivers/nvme/target/Kconfig @@ -90,6 +90,7 @@ config NVME_TARGET_AUTH select CRYPTO_HMAC select CRYPTO_SHA256 select CRYPTO_SHA512 + select CRYPTO_FFDHE help This enables support for NVMe over Fabrics In-band Authentication diff --git a/drivers/nvme/target/auth.c b/drivers/nvme/target/auth.c index 7247a7b97644..274b199bb6d7 100644 --- a/drivers/nvme/target/auth.c +++ b/drivers/nvme/target/auth.c @@ -77,6 +77,71 @@ int nvmet_auth_set_ctrl_key(struct nvmet_host *host, const char *secret) return host->dhchap_ctrl_secret ? 0 : -ENOMEM; } +int nvmet_setup_dhgroup(struct nvmet_ctrl *ctrl, int dhgroup_id) +{ + struct nvmet_host_link *p; + struct nvmet_host *host = NULL; + const char *dhgroup_kpp; + int ret = -ENOTSUPP; + + if (dhgroup_id == NVME_AUTH_DHCHAP_DHGROUP_NULL) + return 0; + + down_read(&nvmet_config_sem); + if (ctrl->subsys->type == NVME_NQN_DISC) + goto out_unlock; + + list_for_each_entry(p, &ctrl->subsys->hosts, entry) { + if (strcmp(nvmet_host_name(p->host), ctrl->hostnqn)) + continue; + host = p->host; + break; + } + if (!host) { + pr_debug("host %s not found\n", ctrl->hostnqn); + ret = -ENXIO; + goto out_unlock; + } + + if (host->dhchap_dhgroup_id != dhgroup_id) { + ret = -EINVAL; + goto out_unlock; + } + if (ctrl->dh_tfm) { + if (ctrl->dh_gid == dhgroup_id) { + pr_debug("reuse existing DH group %d\n", dhgroup_id); + ret = 0; + } else { + pr_debug("DH group mismatch (selected %d, requested %d)\n", + ctrl->dh_gid, dhgroup_id); + ret = -EINVAL; + } + goto out_unlock; + } + + dhgroup_kpp = nvme_auth_dhgroup_kpp(dhgroup_id); + if (!dhgroup_kpp) { + ret = -EINVAL; + goto out_unlock; + } + ctrl->dh_tfm = crypto_alloc_kpp(dhgroup_kpp, 0, 0); + if (IS_ERR(ctrl->dh_tfm)) { + pr_debug("failed to setup DH group %d, err %ld\n", + dhgroup_id, PTR_ERR(ctrl->dh_tfm)); + ret = PTR_ERR(ctrl->dh_tfm); + ctrl->dh_tfm = NULL; + } else { + ctrl->dh_gid = dhgroup_id; + ctrl->dh_keysize = nvme_auth_dhgroup_pubkey_size(dhgroup_id); + ret = 0; + } + +out_unlock: + up_read(&nvmet_config_sem); + + return ret; +} + int nvmet_setup_auth(struct nvmet_ctrl *ctrl) { int ret = 0; @@ -190,6 +255,11 @@ void nvmet_destroy_auth(struct nvmet_ctrl *ctrl) ctrl->shash_tfm = NULL; ctrl->shash_id = 0; } + if (ctrl->dh_tfm) { + crypto_free_kpp(ctrl->dh_tfm); + ctrl->dh_tfm = NULL; + ctrl->dh_gid = 0; + } if (ctrl->dhchap_key) { kfree_sensitive(ctrl->dhchap_key); ctrl->dhchap_key = NULL; @@ -232,8 +302,18 @@ int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response, return ret; } if (ctrl->dh_gid != NVME_AUTH_DHCHAP_DHGROUP_NULL) { - ret = -ENOTSUPP; - goto out; + challenge = kmalloc(shash_len, GFP_KERNEL); + if (!challenge) { + ret = -ENOMEM; + goto out; + } + ret = nvme_auth_augmented_challenge(ctrl->shash_id, + req->sq->dhchap_skey, + req->sq->dhchap_skey_len, + req->sq->dhchap_c1, + challenge, shash_len); + if (ret) + goto out; } shash->tfm = ctrl->shash_tfm; @@ -300,8 +380,18 @@ int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response, return ret; } if (ctrl->dh_gid != NVME_AUTH_DHCHAP_DHGROUP_NULL) { - ret = -ENOTSUPP; - goto out; + challenge = kmalloc(shash_len, GFP_KERNEL); + if (!challenge) { + ret = -ENOMEM; + goto out; + } + ret = nvme_auth_augmented_challenge(ctrl->shash_id, + req->sq->dhchap_skey, + req->sq->dhchap_skey_len, + req->sq->dhchap_c2, + challenge, shash_len); + if (ret) + goto out; } shash->tfm = ctrl->shash_tfm; @@ -343,3 +433,53 @@ int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response, kfree_sensitive(ctrl_response); return 0; } + +int nvmet_auth_ctrl_exponential(struct nvmet_req *req, + u8 *buf, int buf_size) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + int ret; + + if (!ctrl->dh_tfm) { + pr_warn("No DH algorithm!\n"); + return -ENOKEY; + } + ret = nvme_auth_gen_pubkey(ctrl->dh_tfm, buf, buf_size); + if (ret == -EOVERFLOW) { + pr_debug("public key buffer too small, need %d is %d\n", + crypto_kpp_maxsize(ctrl->dh_tfm), buf_size); + ret = -ENOKEY; + } else if (ret) { + pr_debug("failed to generate public key, err %d\n", ret); + ret = -ENOKEY; + } else + pr_debug("%s: ctrl public key %*ph\n", __func__, + (int)buf_size, buf); + + return ret; +} + +int nvmet_auth_ctrl_sesskey(struct nvmet_req *req, + u8 *pkey, int pkey_size) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + int ret; + + req->sq->dhchap_skey_len = + nvme_auth_dhgroup_privkey_size(ctrl->dh_gid); + req->sq->dhchap_skey = kzalloc(req->sq->dhchap_skey_len, GFP_KERNEL); + if (!req->sq->dhchap_skey) + return -ENOMEM; + ret = nvme_auth_gen_shared_secret(ctrl->dh_tfm, + pkey, pkey_size, + req->sq->dhchap_skey, + req->sq->dhchap_skey_len); + if (ret) + pr_debug("failed to compute shared secred, err %d\n", ret); + else + pr_debug("%s: shared secret %*ph\n", __func__, + (int)req->sq->dhchap_skey_len, + req->sq->dhchap_skey); + + return ret; +} diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c index d1f749ecbe4a..0414ff7f4873 100644 --- a/drivers/nvme/target/configfs.c +++ b/drivers/nvme/target/configfs.c @@ -1743,10 +1743,41 @@ static ssize_t nvmet_host_dhchap_hash_store(struct config_item *item, CONFIGFS_ATTR(nvmet_host_, dhchap_hash); +static ssize_t nvmet_host_dhchap_dhgroup_show(struct config_item *item, + char *page) +{ + struct nvmet_host *host = to_host(item); + const char *dhgroup = nvme_auth_dhgroup_name(host->dhchap_dhgroup_id); + + return sprintf(page, "%s\n", dhgroup ? dhgroup : "none"); +} + +static ssize_t nvmet_host_dhchap_dhgroup_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_host *host = to_host(item); + int dhgroup_id; + + dhgroup_id = nvme_auth_dhgroup_id(page); + if (dhgroup_id < 0) + return -EINVAL; + if (dhgroup_id != NVME_AUTH_DHCHAP_DHGROUP_NULL) { + const char *kpp = nvme_auth_dhgroup_kpp(dhgroup_id); + + if (!crypto_has_kpp(kpp, 0, 0)) + return -EINVAL; + } + host->dhchap_dhgroup_id = dhgroup_id; + return count; +} + +CONFIGFS_ATTR(nvmet_host_, dhchap_dhgroup); + static struct configfs_attribute *nvmet_host_attrs[] = { &nvmet_host_attr_dhchap_key, &nvmet_host_attr_dhchap_ctrl_key, &nvmet_host_attr_dhchap_hash, + &nvmet_host_attr_dhchap_dhgroup, NULL, }; #endif /* CONFIG_NVME_TARGET_AUTH */ diff --git a/drivers/nvme/target/fabrics-cmd-auth.c b/drivers/nvme/target/fabrics-cmd-auth.c index 10ab646e85e5..a11de590a5a4 100644 --- a/drivers/nvme/target/fabrics-cmd-auth.c +++ b/drivers/nvme/target/fabrics-cmd-auth.c @@ -64,13 +64,24 @@ static u16 nvmet_auth_negotiate(struct nvmet_req *req, void *d) null_dh = dhgid; continue; } + if (ctrl->dh_tfm && ctrl->dh_gid == dhgid) { + pr_debug("%s: ctrl %d qid %d: reusing existing DH group %d\n", + __func__, ctrl->cntlid, req->sq->qid, dhgid); + break; + } + if (nvmet_setup_dhgroup(ctrl, dhgid) < 0) + continue; + if (nvme_auth_gen_privkey(ctrl->dh_tfm, dhgid) == 0) + break; + crypto_free_kpp(ctrl->dh_tfm); + ctrl->dh_tfm = NULL; + ctrl->dh_gid = 0; } - if (null_dh < 0) { + if (!ctrl->dh_tfm && null_dh < 0) { pr_debug("%s: ctrl %d qid %d: no DH group selected\n", __func__, ctrl->cntlid, req->sq->qid); return NVME_AUTH_DHCHAP_FAILURE_DHGROUP_UNUSABLE; } - ctrl->dh_gid = null_dh; pr_debug("%s: ctrl %d qid %d: DH group %s (%d)\n", __func__, ctrl->cntlid, req->sq->qid, nvme_auth_dhgroup_name(ctrl->dh_gid), ctrl->dh_gid); @@ -92,7 +103,11 @@ static u16 nvmet_auth_reply(struct nvmet_req *req, void *d) return NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD; if (dhvlen) { - return NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD; + if (!ctrl->dh_tfm) + return NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD; + if (nvmet_auth_ctrl_sesskey(req, data->rval + 2 * data->hl, + dhvlen) < 0) + return NVME_AUTH_DHCHAP_FAILURE_DHGROUP_UNUSABLE; } response = kmalloc(data->hl, GFP_KERNEL); @@ -305,6 +320,8 @@ static int nvmet_auth_challenge(struct nvmet_req *req, void *d, int al) int hash_len = crypto_shash_digestsize(ctrl->shash_tfm); int data_size = sizeof(*d) + hash_len; + if (ctrl->dh_tfm) + data_size += ctrl->dh_keysize; if (al < data_size) { pr_debug("%s: buffer too small (al %d need %d)\n", __func__, al, data_size); @@ -323,9 +340,15 @@ static int nvmet_auth_challenge(struct nvmet_req *req, void *d, int al) return -ENOMEM; get_random_bytes(req->sq->dhchap_c1, data->hl); memcpy(data->cval, req->sq->dhchap_c1, data->hl); + if (ctrl->dh_tfm) { + data->dhgid = ctrl->dh_gid; + data->dhvlen = cpu_to_le32(ctrl->dh_keysize); + ret = nvmet_auth_ctrl_exponential(req, data->cval + data->hl, + ctrl->dh_keysize); + } pr_debug("%s: ctrl %d qid %d seq %d transaction %d hl %d dhvlen %d\n", __func__, ctrl->cntlid, req->sq->qid, req->sq->dhchap_s1, - req->sq->dhchap_tid, data->hl, 0); + req->sq->dhchap_tid, data->hl, ctrl->dh_keysize); return ret; } diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index 7fdd48193f83..4e34ee0e51ec 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -229,6 +229,7 @@ struct nvmet_ctrl { size_t dhchap_ctrl_key_len; struct crypto_shash *shash_tfm; u8 shash_id; + struct crypto_kpp *dh_tfm; u32 dh_gid; u32 dh_keysize; #endif @@ -698,6 +699,7 @@ int nvmet_setup_auth(struct nvmet_ctrl *ctrl); void nvmet_init_auth(struct nvmet_ctrl *ctrl, struct nvmet_req *req); void nvmet_destroy_auth(struct nvmet_ctrl *ctrl); void nvmet_auth_sq_free(struct nvmet_sq *sq); +int nvmet_setup_dhgroup(struct nvmet_ctrl *ctrl, int dhgroup_id); bool nvmet_check_auth_status(struct nvmet_req *req); int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response, unsigned int hash_len); @@ -707,6 +709,10 @@ static inline bool nvmet_has_auth(struct nvmet_ctrl *ctrl) { return ctrl->shash_tfm != NULL; } +int nvmet_auth_ctrl_exponential(struct nvmet_req *req, + u8 *buf, int buf_size); +int nvmet_auth_ctrl_sesskey(struct nvmet_req *req, + u8 *buf, int buf_size); #else static inline int nvmet_setup_auth(struct nvmet_ctrl *ctrl) { -- 2.29.2 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme