[PATCH v3 2/3] nvme-auth: use transformed key size to create resp
Mark O'Donovan
shiftee at posteo.net
Mon Oct 16 15:58:56 PDT 2023
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 at dell.com>
Signed-off-by: Akash Appaiah <Akash.Appaiah at dell.com>
Signed-off-by: Mark O'Donovan <shiftee at posteo.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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