529 lines
13 KiB
C
529 lines
13 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* NVMe over Fabrics DH-HMAC-CHAP authentication.
|
||
|
|
* Copyright (c) 2020 Hannes Reinecke, SUSE Software Solutions.
|
||
|
|
* All rights reserved.
|
||
|
|
*/
|
||
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <crypto/hash.h>
|
||
|
|
#include <linux/crc32.h>
|
||
|
|
#include <linux/base64.h>
|
||
|
|
#include <linux/ctype.h>
|
||
|
|
#include <linux/random.h>
|
||
|
|
#include <linux/nvme-auth.h>
|
||
|
|
#include <asm/unaligned.h>
|
||
|
|
|
||
|
|
#include "nvmet.h"
|
||
|
|
|
||
|
|
int nvmet_auth_set_key(struct nvmet_host *host, const char *secret,
|
||
|
|
bool set_ctrl)
|
||
|
|
{
|
||
|
|
unsigned char key_hash;
|
||
|
|
char *dhchap_secret;
|
||
|
|
|
||
|
|
if (sscanf(secret, "DHHC-1:%hhd:%*s", &key_hash) != 1)
|
||
|
|
return -EINVAL;
|
||
|
|
if (key_hash > 3) {
|
||
|
|
pr_warn("Invalid DH-HMAC-CHAP hash id %d\n",
|
||
|
|
key_hash);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
if (key_hash > 0) {
|
||
|
|
/* Validate selected hash algorithm */
|
||
|
|
const char *hmac = nvme_auth_hmac_name(key_hash);
|
||
|
|
|
||
|
|
if (!crypto_has_shash(hmac, 0, 0)) {
|
||
|
|
pr_err("DH-HMAC-CHAP hash %s unsupported\n", hmac);
|
||
|
|
return -ENOTSUPP;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
dhchap_secret = kstrdup(secret, GFP_KERNEL);
|
||
|
|
if (!dhchap_secret)
|
||
|
|
return -ENOMEM;
|
||
|
|
if (set_ctrl) {
|
||
|
|
kfree(host->dhchap_ctrl_secret);
|
||
|
|
host->dhchap_ctrl_secret = strim(dhchap_secret);
|
||
|
|
host->dhchap_ctrl_key_hash = key_hash;
|
||
|
|
} else {
|
||
|
|
kfree(host->dhchap_secret);
|
||
|
|
host->dhchap_secret = strim(dhchap_secret);
|
||
|
|
host->dhchap_key_hash = key_hash;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int nvmet_setup_dhgroup(struct nvmet_ctrl *ctrl, u8 dhgroup_id)
|
||
|
|
{
|
||
|
|
const char *dhgroup_kpp;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
pr_debug("%s: ctrl %d selecting dhgroup %d\n",
|
||
|
|
__func__, ctrl->cntlid, dhgroup_id);
|
||
|
|
|
||
|
|
if (ctrl->dh_tfm) {
|
||
|
|
if (ctrl->dh_gid == dhgroup_id) {
|
||
|
|
pr_debug("%s: ctrl %d reuse existing DH group %d\n",
|
||
|
|
__func__, ctrl->cntlid, dhgroup_id);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
crypto_free_kpp(ctrl->dh_tfm);
|
||
|
|
ctrl->dh_tfm = NULL;
|
||
|
|
ctrl->dh_gid = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (dhgroup_id == NVME_AUTH_DHGROUP_NULL)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
dhgroup_kpp = nvme_auth_dhgroup_kpp(dhgroup_id);
|
||
|
|
if (!dhgroup_kpp) {
|
||
|
|
pr_debug("%s: ctrl %d invalid DH group %d\n",
|
||
|
|
__func__, ctrl->cntlid, dhgroup_id);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
ctrl->dh_tfm = crypto_alloc_kpp(dhgroup_kpp, 0, 0);
|
||
|
|
if (IS_ERR(ctrl->dh_tfm)) {
|
||
|
|
pr_debug("%s: ctrl %d failed to setup DH group %d, err %ld\n",
|
||
|
|
__func__, ctrl->cntlid, dhgroup_id,
|
||
|
|
PTR_ERR(ctrl->dh_tfm));
|
||
|
|
ret = PTR_ERR(ctrl->dh_tfm);
|
||
|
|
ctrl->dh_tfm = NULL;
|
||
|
|
ctrl->dh_gid = 0;
|
||
|
|
} else {
|
||
|
|
ctrl->dh_gid = dhgroup_id;
|
||
|
|
pr_debug("%s: ctrl %d setup DH group %d\n",
|
||
|
|
__func__, ctrl->cntlid, ctrl->dh_gid);
|
||
|
|
ret = nvme_auth_gen_privkey(ctrl->dh_tfm, ctrl->dh_gid);
|
||
|
|
if (ret < 0) {
|
||
|
|
pr_debug("%s: ctrl %d failed to generate private key, err %d\n",
|
||
|
|
__func__, ctrl->cntlid, ret);
|
||
|
|
kfree_sensitive(ctrl->dh_key);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
ctrl->dh_keysize = crypto_kpp_maxsize(ctrl->dh_tfm);
|
||
|
|
kfree_sensitive(ctrl->dh_key);
|
||
|
|
ctrl->dh_key = kzalloc(ctrl->dh_keysize, GFP_KERNEL);
|
||
|
|
if (!ctrl->dh_key) {
|
||
|
|
pr_warn("ctrl %d failed to allocate public key\n",
|
||
|
|
ctrl->cntlid);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
ret = nvme_auth_gen_pubkey(ctrl->dh_tfm, ctrl->dh_key,
|
||
|
|
ctrl->dh_keysize);
|
||
|
|
if (ret < 0) {
|
||
|
|
pr_warn("ctrl %d failed to generate public key\n",
|
||
|
|
ctrl->cntlid);
|
||
|
|
kfree(ctrl->dh_key);
|
||
|
|
ctrl->dh_key = NULL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int nvmet_setup_auth(struct nvmet_ctrl *ctrl)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
struct nvmet_host_link *p;
|
||
|
|
struct nvmet_host *host = NULL;
|
||
|
|
const char *hash_name;
|
||
|
|
|
||
|
|
down_read(&nvmet_config_sem);
|
||
|
|
if (nvmet_is_disc_subsys(ctrl->subsys))
|
||
|
|
goto out_unlock;
|
||
|
|
|
||
|
|
if (ctrl->subsys->allow_any_host)
|
||
|
|
goto out_unlock;
|
||
|
|
|
||
|
|
list_for_each_entry(p, &ctrl->subsys->hosts, entry) {
|
||
|
|
pr_debug("check %s\n", nvmet_host_name(p->host));
|
||
|
|
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 = -EPERM;
|
||
|
|
goto out_unlock;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = nvmet_setup_dhgroup(ctrl, host->dhchap_dhgroup_id);
|
||
|
|
if (ret < 0)
|
||
|
|
pr_warn("Failed to setup DH group");
|
||
|
|
|
||
|
|
if (!host->dhchap_secret) {
|
||
|
|
pr_debug("No authentication provided\n");
|
||
|
|
goto out_unlock;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (host->dhchap_hash_id == ctrl->shash_id) {
|
||
|
|
pr_debug("Re-use existing hash ID %d\n",
|
||
|
|
ctrl->shash_id);
|
||
|
|
} else {
|
||
|
|
hash_name = nvme_auth_hmac_name(host->dhchap_hash_id);
|
||
|
|
if (!hash_name) {
|
||
|
|
pr_warn("Hash ID %d invalid\n", host->dhchap_hash_id);
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto out_unlock;
|
||
|
|
}
|
||
|
|
ctrl->shash_id = host->dhchap_hash_id;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Skip the 'DHHC-1:XX:' prefix */
|
||
|
|
nvme_auth_free_key(ctrl->host_key);
|
||
|
|
ctrl->host_key = nvme_auth_extract_key(host->dhchap_secret + 10,
|
||
|
|
host->dhchap_key_hash);
|
||
|
|
if (IS_ERR(ctrl->host_key)) {
|
||
|
|
ret = PTR_ERR(ctrl->host_key);
|
||
|
|
ctrl->host_key = NULL;
|
||
|
|
goto out_free_hash;
|
||
|
|
}
|
||
|
|
pr_debug("%s: using hash %s key %*ph\n", __func__,
|
||
|
|
ctrl->host_key->hash > 0 ?
|
||
|
|
nvme_auth_hmac_name(ctrl->host_key->hash) : "none",
|
||
|
|
(int)ctrl->host_key->len, ctrl->host_key->key);
|
||
|
|
|
||
|
|
nvme_auth_free_key(ctrl->ctrl_key);
|
||
|
|
if (!host->dhchap_ctrl_secret) {
|
||
|
|
ctrl->ctrl_key = NULL;
|
||
|
|
goto out_unlock;
|
||
|
|
}
|
||
|
|
|
||
|
|
ctrl->ctrl_key = nvme_auth_extract_key(host->dhchap_ctrl_secret + 10,
|
||
|
|
host->dhchap_ctrl_key_hash);
|
||
|
|
if (IS_ERR(ctrl->ctrl_key)) {
|
||
|
|
ret = PTR_ERR(ctrl->ctrl_key);
|
||
|
|
ctrl->ctrl_key = NULL;
|
||
|
|
goto out_free_hash;
|
||
|
|
}
|
||
|
|
pr_debug("%s: using ctrl hash %s key %*ph\n", __func__,
|
||
|
|
ctrl->ctrl_key->hash > 0 ?
|
||
|
|
nvme_auth_hmac_name(ctrl->ctrl_key->hash) : "none",
|
||
|
|
(int)ctrl->ctrl_key->len, ctrl->ctrl_key->key);
|
||
|
|
|
||
|
|
out_free_hash:
|
||
|
|
if (ret) {
|
||
|
|
if (ctrl->host_key) {
|
||
|
|
nvme_auth_free_key(ctrl->host_key);
|
||
|
|
ctrl->host_key = NULL;
|
||
|
|
}
|
||
|
|
ctrl->shash_id = 0;
|
||
|
|
}
|
||
|
|
out_unlock:
|
||
|
|
up_read(&nvmet_config_sem);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
void nvmet_auth_sq_free(struct nvmet_sq *sq)
|
||
|
|
{
|
||
|
|
cancel_delayed_work(&sq->auth_expired_work);
|
||
|
|
kfree(sq->dhchap_c1);
|
||
|
|
sq->dhchap_c1 = NULL;
|
||
|
|
kfree(sq->dhchap_c2);
|
||
|
|
sq->dhchap_c2 = NULL;
|
||
|
|
kfree(sq->dhchap_skey);
|
||
|
|
sq->dhchap_skey = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
void nvmet_destroy_auth(struct nvmet_ctrl *ctrl)
|
||
|
|
{
|
||
|
|
ctrl->shash_id = 0;
|
||
|
|
|
||
|
|
if (ctrl->dh_tfm) {
|
||
|
|
crypto_free_kpp(ctrl->dh_tfm);
|
||
|
|
ctrl->dh_tfm = NULL;
|
||
|
|
ctrl->dh_gid = 0;
|
||
|
|
}
|
||
|
|
kfree_sensitive(ctrl->dh_key);
|
||
|
|
ctrl->dh_key = NULL;
|
||
|
|
|
||
|
|
if (ctrl->host_key) {
|
||
|
|
nvme_auth_free_key(ctrl->host_key);
|
||
|
|
ctrl->host_key = NULL;
|
||
|
|
}
|
||
|
|
if (ctrl->ctrl_key) {
|
||
|
|
nvme_auth_free_key(ctrl->ctrl_key);
|
||
|
|
ctrl->ctrl_key = NULL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool nvmet_check_auth_status(struct nvmet_req *req)
|
||
|
|
{
|
||
|
|
if (req->sq->ctrl->host_key &&
|
||
|
|
!req->sq->authenticated)
|
||
|
|
return false;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
|
||
|
|
unsigned int shash_len)
|
||
|
|
{
|
||
|
|
struct crypto_shash *shash_tfm;
|
||
|
|
struct shash_desc *shash;
|
||
|
|
struct nvmet_ctrl *ctrl = req->sq->ctrl;
|
||
|
|
const char *hash_name;
|
||
|
|
u8 *challenge = req->sq->dhchap_c1, *host_response;
|
||
|
|
u8 buf[4];
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
hash_name = nvme_auth_hmac_name(ctrl->shash_id);
|
||
|
|
if (!hash_name) {
|
||
|
|
pr_warn("Hash ID %d invalid\n", ctrl->shash_id);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
shash_tfm = crypto_alloc_shash(hash_name, 0, 0);
|
||
|
|
if (IS_ERR(shash_tfm)) {
|
||
|
|
pr_err("failed to allocate shash %s\n", hash_name);
|
||
|
|
return PTR_ERR(shash_tfm);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (shash_len != crypto_shash_digestsize(shash_tfm)) {
|
||
|
|
pr_debug("%s: hash len mismatch (len %d digest %d)\n",
|
||
|
|
__func__, shash_len,
|
||
|
|
crypto_shash_digestsize(shash_tfm));
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto out_free_tfm;
|
||
|
|
}
|
||
|
|
|
||
|
|
host_response = nvme_auth_transform_key(ctrl->host_key, ctrl->hostnqn);
|
||
|
|
if (IS_ERR(host_response)) {
|
||
|
|
ret = PTR_ERR(host_response);
|
||
|
|
goto out_free_tfm;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = crypto_shash_setkey(shash_tfm, host_response,
|
||
|
|
ctrl->host_key->len);
|
||
|
|
if (ret)
|
||
|
|
goto out_free_response;
|
||
|
|
|
||
|
|
if (ctrl->dh_gid != NVME_AUTH_DHGROUP_NULL) {
|
||
|
|
challenge = kmalloc(shash_len, GFP_KERNEL);
|
||
|
|
if (!challenge) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out_free_response;
|
||
|
|
}
|
||
|
|
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_free_response;
|
||
|
|
}
|
||
|
|
|
||
|
|
pr_debug("ctrl %d qid %d host response seq %u transaction %d\n",
|
||
|
|
ctrl->cntlid, req->sq->qid, req->sq->dhchap_s1,
|
||
|
|
req->sq->dhchap_tid);
|
||
|
|
|
||
|
|
shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(shash_tfm),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!shash) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out_free_response;
|
||
|
|
}
|
||
|
|
shash->tfm = shash_tfm;
|
||
|
|
ret = crypto_shash_init(shash);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, challenge, shash_len);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
put_unaligned_le32(req->sq->dhchap_s1, buf);
|
||
|
|
ret = crypto_shash_update(shash, buf, 4);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
put_unaligned_le16(req->sq->dhchap_tid, buf);
|
||
|
|
ret = crypto_shash_update(shash, buf, 2);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
memset(buf, 0, 4);
|
||
|
|
ret = crypto_shash_update(shash, buf, 1);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, "HostHost", 8);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, ctrl->hostnqn, strlen(ctrl->hostnqn));
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, buf, 1);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, ctrl->subsysnqn,
|
||
|
|
strlen(ctrl->subsysnqn));
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_final(shash, response);
|
||
|
|
out:
|
||
|
|
if (challenge != req->sq->dhchap_c1)
|
||
|
|
kfree(challenge);
|
||
|
|
kfree(shash);
|
||
|
|
out_free_response:
|
||
|
|
kfree_sensitive(host_response);
|
||
|
|
out_free_tfm:
|
||
|
|
crypto_free_shash(shash_tfm);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response,
|
||
|
|
unsigned int shash_len)
|
||
|
|
{
|
||
|
|
struct crypto_shash *shash_tfm;
|
||
|
|
struct shash_desc *shash;
|
||
|
|
struct nvmet_ctrl *ctrl = req->sq->ctrl;
|
||
|
|
const char *hash_name;
|
||
|
|
u8 *challenge = req->sq->dhchap_c2, *ctrl_response;
|
||
|
|
u8 buf[4];
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
hash_name = nvme_auth_hmac_name(ctrl->shash_id);
|
||
|
|
if (!hash_name) {
|
||
|
|
pr_warn("Hash ID %d invalid\n", ctrl->shash_id);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
shash_tfm = crypto_alloc_shash(hash_name, 0, 0);
|
||
|
|
if (IS_ERR(shash_tfm)) {
|
||
|
|
pr_err("failed to allocate shash %s\n", hash_name);
|
||
|
|
return PTR_ERR(shash_tfm);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (shash_len != crypto_shash_digestsize(shash_tfm)) {
|
||
|
|
pr_debug("%s: hash len mismatch (len %d digest %d)\n",
|
||
|
|
__func__, shash_len,
|
||
|
|
crypto_shash_digestsize(shash_tfm));
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto out_free_tfm;
|
||
|
|
}
|
||
|
|
|
||
|
|
ctrl_response = nvme_auth_transform_key(ctrl->ctrl_key,
|
||
|
|
ctrl->subsysnqn);
|
||
|
|
if (IS_ERR(ctrl_response)) {
|
||
|
|
ret = PTR_ERR(ctrl_response);
|
||
|
|
goto out_free_tfm;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = crypto_shash_setkey(shash_tfm, ctrl_response,
|
||
|
|
ctrl->ctrl_key->len);
|
||
|
|
if (ret)
|
||
|
|
goto out_free_response;
|
||
|
|
|
||
|
|
if (ctrl->dh_gid != NVME_AUTH_DHGROUP_NULL) {
|
||
|
|
challenge = kmalloc(shash_len, GFP_KERNEL);
|
||
|
|
if (!challenge) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out_free_response;
|
||
|
|
}
|
||
|
|
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_free_response;
|
||
|
|
}
|
||
|
|
|
||
|
|
shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(shash_tfm),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!shash) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out_free_response;
|
||
|
|
}
|
||
|
|
shash->tfm = shash_tfm;
|
||
|
|
|
||
|
|
ret = crypto_shash_init(shash);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, challenge, shash_len);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
put_unaligned_le32(req->sq->dhchap_s2, buf);
|
||
|
|
ret = crypto_shash_update(shash, buf, 4);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
put_unaligned_le16(req->sq->dhchap_tid, buf);
|
||
|
|
ret = crypto_shash_update(shash, buf, 2);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
memset(buf, 0, 4);
|
||
|
|
ret = crypto_shash_update(shash, buf, 1);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, "Controller", 10);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, ctrl->subsysnqn,
|
||
|
|
strlen(ctrl->subsysnqn));
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, buf, 1);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_update(shash, ctrl->hostnqn, strlen(ctrl->hostnqn));
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
ret = crypto_shash_final(shash, response);
|
||
|
|
out:
|
||
|
|
if (challenge != req->sq->dhchap_c2)
|
||
|
|
kfree(challenge);
|
||
|
|
kfree(shash);
|
||
|
|
out_free_response:
|
||
|
|
kfree_sensitive(ctrl_response);
|
||
|
|
out_free_tfm:
|
||
|
|
crypto_free_shash(shash_tfm);
|
||
|
|
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 = 0;
|
||
|
|
|
||
|
|
if (!ctrl->dh_key) {
|
||
|
|
pr_warn("ctrl %d no DH public key!\n", ctrl->cntlid);
|
||
|
|
return -ENOKEY;
|
||
|
|
}
|
||
|
|
if (buf_size != ctrl->dh_keysize) {
|
||
|
|
pr_warn("ctrl %d DH public key size mismatch, need %zu is %d\n",
|
||
|
|
ctrl->cntlid, ctrl->dh_keysize, buf_size);
|
||
|
|
ret = -EINVAL;
|
||
|
|
} else {
|
||
|
|
memcpy(buf, ctrl->dh_key, buf_size);
|
||
|
|
pr_debug("%s: ctrl %d public key %*ph\n", __func__,
|
||
|
|
ctrl->cntlid, (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 = ctrl->dh_keysize;
|
||
|
|
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 secret, 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;
|
||
|
|
}
|