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Date: Mon, 16 Oct 2023 22:58:56 +0000
From: Mark O'Donovan <shiftee@...teo.net>
To: linux-kernel@...r.kernel.org
Cc: linux-nvme@...ts.infradead.org, sagi@...mberg.me, hch@....de,
axboe@...nel.dk, kbusch@...nel.org, hare@...e.de,
Mark O'Donovan <shiftee@...teo.net>,
Akash Appaiah <Akash.Appaiah@...l.com>
Subject: [PATCH v3 2/3] nvme-auth: use transformed key size to create resp
This does not change current behaviour as the driver currently
verifies that the secret size is the same size as the length of
the transformation hash.
Co-developed-by: Akash Appaiah <Akash.Appaiah@...l.com>
Signed-off-by: Akash Appaiah <Akash.Appaiah@...l.com>
Signed-off-by: Mark O'Donovan <shiftee@...teo.net>
---
V1 -> V2: support target implementation and controller secrets also
V2 -> V3: return key from nvme_auth_transform_key
drivers/nvme/common/auth.c | 18 ++++++++++--------
drivers/nvme/host/auth.c | 30 +++++++++++++++---------------
drivers/nvme/target/auth.c | 30 ++++++++++++++++--------------
include/linux/nvme-auth.h | 2 +-
4 files changed, 42 insertions(+), 38 deletions(-)
diff --git a/drivers/nvme/common/auth.c b/drivers/nvme/common/auth.c
index 225fc474e34a..647931acc1ba 100644
--- a/drivers/nvme/common/auth.c
+++ b/drivers/nvme/common/auth.c
@@ -233,20 +233,21 @@ void nvme_auth_free_key(struct nvme_dhchap_key *key)
}
EXPORT_SYMBOL_GPL(nvme_auth_free_key);
-u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
+struct nvme_dhchap_key *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
{
const char *hmac_name;
struct crypto_shash *key_tfm;
struct shash_desc *shash;
- u8 *transformed_key;
- int ret;
+ struct nvme_dhchap_key *transformed_key;
+ int ret, key_len;
if (!key || !key->key) {
pr_warn("No key specified\n");
return ERR_PTR(-ENOKEY);
}
if (key->hash == 0) {
- transformed_key = kmemdup(key->key, key->len, GFP_KERNEL);
+ key_len = sizeof(*key) + key->len;
+ transformed_key = kmemdup(key, key_len, GFP_KERNEL);
return transformed_key ? transformed_key : ERR_PTR(-ENOMEM);
}
hmac_name = nvme_auth_hmac_name(key->hash);
@@ -257,7 +258,7 @@ u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
key_tfm = crypto_alloc_shash(hmac_name, 0, 0);
if (IS_ERR(key_tfm))
- return (u8 *)key_tfm;
+ return (void *)key_tfm;
shash = kmalloc(sizeof(struct shash_desc) +
crypto_shash_descsize(key_tfm),
@@ -267,7 +268,8 @@ u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
goto out_free_key;
}
- transformed_key = kzalloc(crypto_shash_digestsize(key_tfm), GFP_KERNEL);
+ key_len = crypto_shash_digestsize(key_tfm);
+ transformed_key = nvme_auth_alloc_key(key_len, key->hash);
if (!transformed_key) {
ret = -ENOMEM;
goto out_free_shash;
@@ -286,7 +288,7 @@ u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
ret = crypto_shash_update(shash, "NVMe-over-Fabrics", 17);
if (ret < 0)
goto out_free_transformed_key;
- ret = crypto_shash_final(shash, transformed_key);
+ ret = crypto_shash_final(shash, transformed_key->key);
if (ret < 0)
goto out_free_transformed_key;
@@ -296,7 +298,7 @@ u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
return transformed_key;
out_free_transformed_key:
- kfree_sensitive(transformed_key);
+ nvme_auth_free_key(transformed_key);
out_free_shash:
kfree(shash);
out_free_key:
diff --git a/drivers/nvme/host/auth.c b/drivers/nvme/host/auth.c
index daf5d144a8ea..de1390d705dc 100644
--- a/drivers/nvme/host/auth.c
+++ b/drivers/nvme/host/auth.c
@@ -23,6 +23,7 @@ struct nvme_dhchap_queue_context {
struct nvme_ctrl *ctrl;
struct crypto_shash *shash_tfm;
struct crypto_kpp *dh_tfm;
+ struct nvme_dhchap_key *transformed_key;
void *buf;
int qid;
int error;
@@ -36,7 +37,6 @@ struct nvme_dhchap_queue_context {
u8 c1[64];
u8 c2[64];
u8 response[64];
- u8 *host_response;
u8 *ctrl_key;
u8 *host_key;
u8 *sess_key;
@@ -428,12 +428,12 @@ static int nvme_auth_dhchap_setup_host_response(struct nvme_ctrl *ctrl,
dev_dbg(ctrl->device, "%s: qid %d host response seq %u transaction %d\n",
__func__, chap->qid, chap->s1, chap->transaction);
- if (!chap->host_response) {
- chap->host_response = nvme_auth_transform_key(ctrl->host_key,
+ if (!chap->transformed_key) {
+ chap->transformed_key = nvme_auth_transform_key(ctrl->host_key,
ctrl->opts->host->nqn);
- if (IS_ERR(chap->host_response)) {
- ret = PTR_ERR(chap->host_response);
- chap->host_response = NULL;
+ if (IS_ERR(chap->transformed_key)) {
+ ret = PTR_ERR(chap->transformed_key);
+ chap->transformed_key = NULL;
return ret;
}
} else {
@@ -442,7 +442,7 @@ static int nvme_auth_dhchap_setup_host_response(struct nvme_ctrl *ctrl,
}
ret = crypto_shash_setkey(chap->shash_tfm,
- chap->host_response, ctrl->host_key->len);
+ chap->transformed_key->key, chap->transformed_key->len);
if (ret) {
dev_warn(ctrl->device, "qid %d: failed to set key, error %d\n",
chap->qid, ret);
@@ -508,19 +508,19 @@ static int nvme_auth_dhchap_setup_ctrl_response(struct nvme_ctrl *ctrl,
struct nvme_dhchap_queue_context *chap)
{
SHASH_DESC_ON_STACK(shash, chap->shash_tfm);
- u8 *ctrl_response;
+ struct nvme_dhchap_key *transformed_key;
u8 buf[4], *challenge = chap->c2;
int ret;
- ctrl_response = nvme_auth_transform_key(ctrl->ctrl_key,
+ transformed_key = nvme_auth_transform_key(ctrl->ctrl_key,
ctrl->opts->subsysnqn);
- if (IS_ERR(ctrl_response)) {
- ret = PTR_ERR(ctrl_response);
+ if (IS_ERR(transformed_key)) {
+ ret = PTR_ERR(transformed_key);
return ret;
}
ret = crypto_shash_setkey(chap->shash_tfm,
- ctrl_response, ctrl->ctrl_key->len);
+ transformed_key->key, transformed_key->len);
if (ret) {
dev_warn(ctrl->device, "qid %d: failed to set key, error %d\n",
chap->qid, ret);
@@ -586,7 +586,7 @@ static int nvme_auth_dhchap_setup_ctrl_response(struct nvme_ctrl *ctrl,
out:
if (challenge != chap->c2)
kfree(challenge);
- kfree(ctrl_response);
+ nvme_auth_free_key(transformed_key);
return ret;
}
@@ -648,8 +648,8 @@ static int nvme_auth_dhchap_exponential(struct nvme_ctrl *ctrl,
static void nvme_auth_reset_dhchap(struct nvme_dhchap_queue_context *chap)
{
- kfree_sensitive(chap->host_response);
- chap->host_response = NULL;
+ nvme_auth_free_key(chap->transformed_key);
+ chap->transformed_key = NULL;
kfree_sensitive(chap->host_key);
chap->host_key = NULL;
chap->host_key_len = 0;
diff --git a/drivers/nvme/target/auth.c b/drivers/nvme/target/auth.c
index 4dcddcf95279..84f3ab1f9d02 100644
--- a/drivers/nvme/target/auth.c
+++ b/drivers/nvme/target/auth.c
@@ -267,7 +267,8 @@ int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
struct shash_desc *shash;
struct nvmet_ctrl *ctrl = req->sq->ctrl;
const char *hash_name;
- u8 *challenge = req->sq->dhchap_c1, *host_response;
+ u8 *challenge = req->sq->dhchap_c1;
+ struct nvme_dhchap_key *transformed_key;
u8 buf[4];
int ret;
@@ -291,14 +292,14 @@ int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
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);
+ transformed_key = nvme_auth_transform_key(ctrl->host_key, ctrl->hostnqn);
+ if (IS_ERR(transformed_key)) {
+ ret = PTR_ERR(transformed_key);
goto out_free_tfm;
}
- ret = crypto_shash_setkey(shash_tfm, host_response,
- ctrl->host_key->len);
+ ret = crypto_shash_setkey(shash_tfm, transformed_key->key,
+ transformed_key->len);
if (ret)
goto out_free_response;
@@ -365,7 +366,7 @@ int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
kfree(challenge);
kfree(shash);
out_free_response:
- kfree_sensitive(host_response);
+ nvme_auth_free_key(transformed_key);
out_free_tfm:
crypto_free_shash(shash_tfm);
return 0;
@@ -378,7 +379,8 @@ int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response,
struct shash_desc *shash;
struct nvmet_ctrl *ctrl = req->sq->ctrl;
const char *hash_name;
- u8 *challenge = req->sq->dhchap_c2, *ctrl_response;
+ u8 *challenge = req->sq->dhchap_c2;
+ struct nvme_dhchap_key *transformed_key;
u8 buf[4];
int ret;
@@ -402,15 +404,15 @@ int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response,
goto out_free_tfm;
}
- ctrl_response = nvme_auth_transform_key(ctrl->ctrl_key,
+ transformed_key = nvme_auth_transform_key(ctrl->ctrl_key,
ctrl->subsysnqn);
- if (IS_ERR(ctrl_response)) {
- ret = PTR_ERR(ctrl_response);
+ if (IS_ERR(transformed_key)) {
+ ret = PTR_ERR(transformed_key);
goto out_free_tfm;
}
- ret = crypto_shash_setkey(shash_tfm, ctrl_response,
- ctrl->ctrl_key->len);
+ ret = crypto_shash_setkey(shash_tfm, transformed_key->key,
+ transformed_key->len);
if (ret)
goto out_free_response;
@@ -474,7 +476,7 @@ int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response,
kfree(challenge);
kfree(shash);
out_free_response:
- kfree_sensitive(ctrl_response);
+ nvme_auth_free_key(transformed_key);
out_free_tfm:
crypto_free_shash(shash_tfm);
return 0;
diff --git a/include/linux/nvme-auth.h b/include/linux/nvme-auth.h
index df96940be930..fd8f69183d55 100644
--- a/include/linux/nvme-auth.h
+++ b/include/linux/nvme-auth.h
@@ -28,7 +28,7 @@ struct nvme_dhchap_key *nvme_auth_extract_key(unsigned char *secret,
u8 key_hash);
void nvme_auth_free_key(struct nvme_dhchap_key *key);
struct nvme_dhchap_key *nvme_auth_alloc_key(u32 len, u8 hash);
-u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn);
+struct nvme_dhchap_key *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn);
int nvme_auth_generate_key(u8 *secret, struct nvme_dhchap_key **ret_key);
int nvme_auth_augmented_challenge(u8 hmac_id, u8 *skey, size_t skey_len,
u8 *challenge, u8 *aug, size_t hlen);
--
2.39.2
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