[PATCH 06/11] nvme: Implement In-Band authentication
Chaitanya Kulkarni
chaitanyak at nvidia.com
Thu Mar 24 09:53:35 PDT 2022
On 3/23/22 00:12, Hannes Reinecke wrote:
> Implement NVMe-oF In-Band authentication according to NVMe TPAR 8006.
> This patch adds two new fabric options 'dhchap_secret' to specify the
> pre-shared key (in ASCII respresentation according to NVMe 2.0 section
> 8.13.5.8 'Secret representation') and 'dhchap_ctrl_secret' to specify
> the pre-shared controller key for bi-directional authentication of both
> the host and the controller.
> Re-authentication can be triggered by writing the PSK into the new
> controller sysfs attribute 'dhchap_secret' or 'dhchap_ctrl_secret'.
>
> Signed-off-by: Hannes Reinecke <hare at suse.de>
> ---
> drivers/nvme/host/Kconfig | 11 +
> drivers/nvme/host/Makefile | 1 +
> drivers/nvme/host/auth.c | 1140 +++++++++++++++++++++++++++++++++++
> drivers/nvme/host/auth.h | 32 +
> drivers/nvme/host/core.c | 141 ++++-
> drivers/nvme/host/fabrics.c | 79 ++-
> drivers/nvme/host/fabrics.h | 7 +
> drivers/nvme/host/nvme.h | 31 +
> drivers/nvme/host/rdma.c | 1 +
> drivers/nvme/host/tcp.c | 1 +
> drivers/nvme/host/trace.c | 32 +
> 11 files changed, 1469 insertions(+), 7 deletions(-)
> create mode 100644 drivers/nvme/host/auth.c
> create mode 100644 drivers/nvme/host/auth.h
>
> diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
> index d6d056963c06..dd0e91fb0615 100644
> --- a/drivers/nvme/host/Kconfig
> +++ b/drivers/nvme/host/Kconfig
> @@ -91,3 +91,14 @@ config NVME_TCP
> from https://github.com/linux-nvme/nvme-cli.
>
> If unsure, say N.
> +
> +config NVME_AUTH
> + bool "NVM Express over Fabrics In-Band Authentication"
> + depends on NVME_CORE
> + select CRYPTO_HMAC
> + select CRYPTO_SHA256
> + select CRYPTO_SHA512
> + help
> + This provides support for NVMe over Fabrics In-Band Authentication.
> +
> + If unsure, say N.
> diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile
> index 476c5c988496..7755f5e3b281 100644
> --- a/drivers/nvme/host/Makefile
> +++ b/drivers/nvme/host/Makefile
> @@ -15,6 +15,7 @@ nvme-core-$(CONFIG_NVME_MULTIPATH) += multipath.o
> nvme-core-$(CONFIG_BLK_DEV_ZONED) += zns.o
> nvme-core-$(CONFIG_FAULT_INJECTION_DEBUG_FS) += fault_inject.o
> nvme-core-$(CONFIG_NVME_HWMON) += hwmon.o
> +nvme-core-$(CONFIG_NVME_AUTH) += auth.o
>
> nvme-y += pci.o
>
> diff --git a/drivers/nvme/host/auth.c b/drivers/nvme/host/auth.c
> new file mode 100644
> index 000000000000..4bca4ba1ccea
> --- /dev/null
> +++ b/drivers/nvme/host/auth.c
> @@ -0,0 +1,1140 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2020 Hannes Reinecke, SUSE Linux
> + */
> +
> +#include <linux/crc32.h>
> +#include <linux/base64.h>
> +#include <linux/prandom.h>
> +#include <asm/unaligned.h>
> +#include <crypto/hash.h>
> +#include <crypto/dh.h>
> +#include "nvme.h"
> +#include "fabrics.h"
> +#include "auth.h"
> +
> +static u32 nvme_dhchap_seqnum;
> +static DEFINE_MUTEX(nvme_dhchap_mutex);
> +
> +struct nvme_dhchap_queue_context {
> + struct list_head entry;
> + struct work_struct auth_work;
> + struct nvme_ctrl *ctrl;
> + struct crypto_shash *shash_tfm;
> + void *buf;
> + size_t buf_size;
> + int qid;
> + int error;
> + u32 s1;
> + u32 s2;
> + u16 transaction;
> + u8 status;
> + u8 hash_id;
> + size_t hash_len;
> + u8 dhgroup_id;
> + u8 c1[64];
> + u8 c2[64];
> + u8 response[64];
> + u8 *host_response;
> +};
> +
> +u32 nvme_auth_get_seqnum(void)
> +{
> + u32 seqnum;
> +
> + mutex_lock(&nvme_dhchap_mutex);
> + if (!nvme_dhchap_seqnum)
> + nvme_dhchap_seqnum = prandom_u32();
> + else {
> + nvme_dhchap_seqnum++;
> + if (!nvme_dhchap_seqnum)
> + nvme_dhchap_seqnum++;
> + }
> + seqnum = nvme_dhchap_seqnum;
> + mutex_unlock(&nvme_dhchap_mutex);
> + return seqnum;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_get_seqnum);
> +
> +static struct nvme_auth_dhgroup_map {
> + u8 id;
> + const char name[16];
> + const char kpp[16];
> +} dhgroup_map[] = {
> + { .id = NVME_AUTH_DHGROUP_NULL,
> + .name = "null", .kpp = "null" },
> + { .id = NVME_AUTH_DHGROUP_2048,
> + .name = "ffdhe2048", .kpp = "ffdhe2048(dh)" },
> + { .id = NVME_AUTH_DHGROUP_3072,
> + .name = "ffdhe3072", .kpp = "ffdhe3072(dh)" },
> + { .id = NVME_AUTH_DHGROUP_4096,
> + .name = "ffdhe4096", .kpp = "ffdhe4096(dh)" },
> + { .id = NVME_AUTH_DHGROUP_6144,
> + .name = "ffdhe6144", .kpp = "ffdhe6144(dh)" },
> + { .id = NVME_AUTH_DHGROUP_8192,
> + .name = "ffdhe8192", .kpp = "ffdhe8192(dh)" },
> +};
> +
> +const char *nvme_auth_dhgroup_name(u8 dhgroup_id)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(dhgroup_map); i++) {
> + if (dhgroup_map[i].id == dhgroup_id)
> + return dhgroup_map[i].name;
> + }
> + return NULL;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_dhgroup_name);
> +
> +const char *nvme_auth_dhgroup_kpp(u8 dhgroup_id)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(dhgroup_map); i++) {
> + if (dhgroup_map[i].id == dhgroup_id)
> + return dhgroup_map[i].kpp;
> + }
> + return NULL;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_dhgroup_kpp);
> +
> +u8 nvme_auth_dhgroup_id(const char *dhgroup_name)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(dhgroup_map); i++) {
> + if (!strncmp(dhgroup_map[i].name, dhgroup_name,
> + strlen(dhgroup_map[i].name)))
> + return dhgroup_map[i].id;
> + }
> + return NVME_AUTH_DHGROUP_INVALID;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_dhgroup_id);
> +
> +static struct nvme_dhchap_hash_map {
> + int id;
> + int len;
> + const char hmac[15];
> + const char digest[15];
> +} hash_map[] = {
> + {.id = NVME_AUTH_HASH_SHA256, .len = 32,
> + .hmac = "hmac(sha256)", .digest = "sha256" },
> + {.id = NVME_AUTH_HASH_SHA384, .len = 48,
> + .hmac = "hmac(sha384)", .digest = "sha384" },
> + {.id = NVME_AUTH_HASH_SHA512, .len = 64,
> + .hmac = "hmac(sha512)", .digest = "sha512" },
> +};
> +
> +const char *nvme_auth_hmac_name(u8 hmac_id)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(hash_map); i++) {
> + if (hash_map[i].id == hmac_id)
> + return hash_map[i].hmac;
> + }
> + return NULL;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_hmac_name);
> +
> +const char *nvme_auth_digest_name(u8 hmac_id)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(hash_map); i++) {
> + if (hash_map[i].id == hmac_id)
> + return hash_map[i].digest;
> + }
> + return NULL;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_digest_name);
> +
> +u8 nvme_auth_hmac_id(const char *hmac_name)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(hash_map); i++) {
> + if (!strncmp(hash_map[i].hmac, hmac_name,
> + strlen(hash_map[i].hmac)))
> + return hash_map[i].id;
> + }
> + return NVME_AUTH_HASH_INVALID;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_hmac_id);
> +
> +size_t nvme_auth_hmac_hash_len(u8 hmac_id)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(hash_map); i++) {
> + if (hash_map[i].id == hmac_id)
> + return hash_map[i].len;
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_hmac_hash_len);
we can remove loops in the above helpers and the id member in
the struct with the help of the sparse array, why not :-
/* Defined hash functions for DH-HMAC-CHAP authentication */
enum {
NVME_AUTH_HASH_SHA256 = 0x01,
NVME_AUTH_HASH_SHA384 = 0x02,
NVME_AUTH_HASH_SHA512 = 0x03,
NVME_AUTH_HASH_INVALID = 0xff,
};
static struct nvme_dhchap_hash_map {
int len;
const char *hmac;
const char *digest;
} hash_map[] = {
[NVME_AUTH_HASH_SHA256] = { .len = 32,
.hmac = "hmac(sha256)",
.digest = "sha256"
},
[NVME_AUTH_HASH_SHA384] = { .len = 48,
.hmac = "hmac(sha384)",
.digest = "sha384"
},
[NVME_AUTH_HASH_SHA512] = { .len = 64,
.hmac = "hmac(sha512)",
.digest = "sha512"
},
};
const char *nvme_auth_hmac_name(unsigned int hmac_id)
{
if ((hmac_id > ARRAY_SIZE(hash_map)) || !hash_map[hmac_id].hmac)
return NULL;
return hash_map[hmac_id].hmac;
}
const char *nvme_auth_digest_name(unsigned int hmac_id)
{
if ((hmac_id > ARRAY_SIZE(hash_map)) || !hash_map[hmac_id].hmac)
return NULL;
return hash_map[hmac_id].digest;
}
size_t nvme_auth_hmac_hash_len(unsigned int hmac_id)
{
if ((hmac_id > ARRAY_SIZE(hash_map)) || !hash_map[hmac_id].hmac)
return 0;
return hash_map[hmac_id].len;
}
unsigned int nvme_auth_hmac_id(const char *hmac_name)
{
int i;
for (i = 0; i < ARRAY_SIZE(hash_map); i++) {
if (!hash_map[i].hmac)
continue;
if (!strncmp(hash_map[i].hmac, hmac_name,
strlen(hash_map[i].hmac)))
return i;
}
return NVME_AUTH_HASH_INVALID;
}
See [1] that has a test program execution, same can be applied to
nvme_dhchap_hash_map.
> +
> +struct nvme_dhchap_key *nvme_auth_extract_key(unsigned char *secret,
> + u8 key_hash)
> +{
> + struct nvme_dhchap_key *key;
> + unsigned char *p;
> + u32 crc;
> + int ret, key_len;
> + size_t allocated_len = strlen(secret);
> +
> + /* Secret might be affixed with a ':' */
> + p = strrchr(secret, ':');
> + if (p)
> + allocated_len = p - secret;
> + key = kzalloc(sizeof(*key), GFP_KERNEL);
> + if (!key)
> + return ERR_PTR(-ENOMEM);
> + key->key = kzalloc(allocated_len, GFP_KERNEL);
> + if (!key->key) {
> + ret = -ENOMEM;
> + goto out_free_key;
> + }
> +
> + key_len = base64_decode(secret, allocated_len, key->key);
> + if (key_len < 0) {
> + pr_debug("base64 key decoding error %d\n",
> + key_len);
> + ret = key_len;
> + goto out_free_secret;
> + }
> +
> + if (key_len != 36 && key_len != 52 &&
> + key_len != 68) {
> + pr_err("Invalid DH-HMAC-CHAP key len %d\n",
> + key_len);
> + ret = -EINVAL;
> + goto out_free_secret;
> + }
> +
> + if (key_hash > 0 &&
> + (key_len - 4) != nvme_auth_hmac_hash_len(key_hash)) {
> + pr_err("Invalid DH-HMAC-CHAP key len %d for %s\n", key_len,
> + nvme_auth_hmac_name(key_hash));
> + ret = -EINVAL;
> + goto out_free_secret;
> + }
> +
> + /* The last four bytes is the CRC in little-endian format */
> + key_len -= 4;
> + /*
> + * The linux implementation doesn't do pre- and post-increments,
> + * so we have to do it manually.
> + */
> + crc = ~crc32(~0, key->key, key_len);
> +
> + if (get_unaligned_le32(key->key + key_len) != crc) {
> + pr_err("DH-HMAC-CHAP key crc mismatch (key %08x, crc %08x)\n",
> + get_unaligned_le32(key->key + key_len), crc);
> + ret = -EKEYREJECTED;
> + goto out_free_secret;
> + }
> + key->len = key_len;
> + key->hash = key_hash;
> + return key;
> +out_free_secret:
> + kfree_sensitive(key->key);
> +out_free_key:
> + kfree(key);
> + return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_extract_key);
> +
> +void nvme_auth_free_key(struct nvme_dhchap_key *key)
> +{
> + if (!key)
> + return;
> + kfree_sensitive(key->key);
> + kfree(key);
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_free_key);
> +
> +u8 *nvme_auth_transform_key(struct nvme_dhchap_key *key, char *nqn)
> +{
> + const char *hmac_name = nvme_auth_hmac_name(key->hash);
> + struct crypto_shash *key_tfm;
> + struct shash_desc *shash;
> + u8 *transformed_key;
> + int ret;
> +
> + if (key->hash == 0) {
> + transformed_key = kmemdup(key->key, key->len, GFP_KERNEL);
> + return transformed_key ? transformed_key : ERR_PTR(-ENOMEM);
> + }
> +
> + if (!key || !key->key) {
> + pr_warn("No key specified\n");
> + return ERR_PTR(-ENOKEY);
> + }
> + if (!hmac_name) {
> + pr_warn("Invalid key hash id %d\n", key->hash);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + key_tfm = crypto_alloc_shash(hmac_name, 0, 0);
> + if (IS_ERR(key_tfm))
> + return (u8 *)key_tfm;
> +
> + shash = kmalloc(sizeof(struct shash_desc) +
> + crypto_shash_descsize(key_tfm),
> + GFP_KERNEL);
> + if (!shash) {
> + ret = -ENOMEM;
> + goto out_free_key;
> + }
> +
> + transformed_key = kzalloc(crypto_shash_digestsize(key_tfm), GFP_KERNEL);
> + if (!transformed_key) {
> + ret = -ENOMEM;
> + goto out_free_shash;
> + }
> +
> + shash->tfm = key_tfm;
> + ret = crypto_shash_setkey(key_tfm, key->key, key->len);
> + if (ret < 0)
> + goto out_free_shash;
> + ret = crypto_shash_init(shash);
> + if (ret < 0)
> + goto out_free_shash;
> + ret = crypto_shash_update(shash, nqn, strlen(nqn));
> + if (ret < 0)
> + goto out_free_shash;
> + ret = crypto_shash_update(shash, "NVMe-over-Fabrics", 17);
> + if (ret < 0)
> + goto out_free_shash;
> + ret = crypto_shash_final(shash, transformed_key);
> +out_free_shash:
> + kfree(shash);
> +out_free_key:
> + crypto_free_shash(key_tfm);
> + if (ret < 0) {
> + kfree_sensitive(transformed_key);
> + return ERR_PTR(ret);
> + }
> + return transformed_key;
> +}
> +EXPORT_SYMBOL_GPL(nvme_auth_transform_key);
> +
> +#define nvme_auth_flags_from_qid(qid) \
> + (qid == 0) ? 0 : BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED
> +#define nvme_auth_queue_from_qid(ctrl, qid) \
> + (qid == 0) ? (ctrl)->fabrics_q : (ctrl)->connect_q
> +
> +static int nvme_auth_send(struct nvme_ctrl *ctrl, int qid,
> + void *data, size_t tl)
> +{
> + struct nvme_command cmd = {};
> + blk_mq_req_flags_t flags = nvme_auth_flags_from_qid(qid);
> + struct request_queue *q = nvme_auth_queue_from_qid(ctrl, qid);
> + int ret;
> +
> + cmd.auth_send.opcode = nvme_fabrics_command;
> + cmd.auth_send.fctype = nvme_fabrics_type_auth_send;
> + cmd.auth_send.secp = NVME_AUTH_DHCHAP_PROTOCOL_IDENTIFIER;
> + cmd.auth_send.spsp0 = 0x01;
> + cmd.auth_send.spsp1 = 0x01;
> + cmd.auth_send.tl = cpu_to_le32(tl);
> +
> + ret = __nvme_submit_sync_cmd(q, &cmd, NULL, data, tl, 0,
> + qid == 0 ? NVME_QID_ANY : qid,
> + 0, flags);
> + if (ret > 0)
> + dev_warn(ctrl->device,
> + "qid %d auth_send failed with status %d\n", qid, ret);
> + else if (ret < 0)
> + dev_err(ctrl->device,
> + "qid %d auth_send failed with error %d\n", qid, ret);
> + return ret;
> +}
> +
> +static int nvme_auth_receive(struct nvme_ctrl *ctrl, int qid,
> + void *buf, size_t al)
> +{
> + struct nvme_command cmd = {};
> + blk_mq_req_flags_t flags = nvme_auth_flags_from_qid(qid);
> + struct request_queue *q = nvme_auth_queue_from_qid(ctrl, qid);
> + int ret;
> +
> + cmd.auth_receive.opcode = nvme_fabrics_command;
> + cmd.auth_receive.fctype = nvme_fabrics_type_auth_receive;
> + cmd.auth_receive.secp = NVME_AUTH_DHCHAP_PROTOCOL_IDENTIFIER;
> + cmd.auth_receive.spsp0 = 0x01;
> + cmd.auth_receive.spsp1 = 0x01;
> + cmd.auth_receive.al = cpu_to_le32(al);
> +
> + ret = __nvme_submit_sync_cmd(q, &cmd, NULL, buf, al, 0,
> + qid == 0 ? NVME_QID_ANY : qid,
> + 0, flags);
> + if (ret > 0) {
> + dev_warn(ctrl->device,
> + "qid %d auth_recv failed with status %x\n", qid, ret);
> + ret = -EIO;
> + } else if (ret < 0) {
> + dev_err(ctrl->device,
> + "qid %d auth_recv failed with error %d\n", qid, ret);
> + }
> +
> + return ret;
> +}
> +
Why not use something like this ? It reduces the duplicate code and
need for macros :-
static int nvme_auth_send_recv_common(bool send, struct nvme_ctrl *ctrl,
int qid, void *buf, size_t buflen)
{
strucy nvme_cmd cmd = { };
blk_mq_req_flags_t flags;
struct request_queue *q;
int ret;
flags = qid == 0 ? 0 : BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT;
q = qid == 0 ? ctrl->fabrics_q : ctrl->connect_q;
/* auth send/recv share common offset for the various fields in
cmd */
cmd.auth_send.opcode = nvme_fabrics_command;
cmd.auth_send.secp = NVME_AUTH_DHCHAP_PROTOCOL_IDENTIFIER;
cmd.auth_send.spsp0 = 0x01;
cmd.auth_send.spsp1 = 0x01;
cmd.auth_send.al = cpu_to_le32(buflen);
cmd.auth_receive.fctype = send ? nvme_fabrics_type_auth_send :
nvme_fabrics_type_auth_receive;
ret = nvme_submit_sync_cmd(q, &cmd, NULL, buf, buflen, 0,
qid == 0 ? NVME_QID_ANY : qid,
0, flags);
if (ret > 0)
dev_warn(ctrl->device,
"qid %d fctype 0x%x failed with status %d\n", qid,
cmd.auth_send.fctype, ret);
else if (ret < 0)
dev_err(ctrl->device,
"qid %d fctype 0x%x failed with error %d\n", qid,
cmd.auth_send.fctype, ret);
return ret;
}
static int nvme_auth_send(struct nvme_ctrl *c, int qid, void *data,
size_t tl)
{
return nvme_auth_send_recv_common(true, c, qid, data, tl);
}
static int nvme_auth_receive(struct nvme_ctrl *ctrl, int qid,
void *buf, size_t al)
{
return nvme_auth_send_recv_common(false, c, qid, data, tl);
}
> +static int nvme_auth_receive_validate(struct nvme_ctrl *ctrl, int qid,
> + struct nvmf_auth_dhchap_failure_data *data,
> + u16 transaction, u8 expected_msg)
> +{
> + dev_dbg(ctrl->device, "%s: qid %d auth_type %d auth_id %x\n",
> + __func__, qid, data->auth_type, data->auth_id);
> +
> + if (data->auth_type == NVME_AUTH_COMMON_MESSAGES &&
> + data->auth_id == NVME_AUTH_DHCHAP_MESSAGE_FAILURE1) {
> + return data->rescode_exp;
> + }
> + if (data->auth_type != NVME_AUTH_DHCHAP_MESSAGES ||
> + data->auth_id != expected_msg) {
> + dev_warn(ctrl->device,
> + "qid %d invalid message %02x/%02x\n",
> + qid, data->auth_type, data->auth_id);
> + return NVME_AUTH_DHCHAP_FAILURE_INCORRECT_MESSAGE;
> + }
> + if (le16_to_cpu(data->t_id) != transaction) {
> + dev_warn(ctrl->device,
> + "qid %d invalid transaction ID %d\n",
> + qid, le16_to_cpu(data->t_id));
> + return NVME_AUTH_DHCHAP_FAILURE_INCORRECT_MESSAGE;
> + }
> + return 0;
> +}
> +
[...]
[1] # cat a.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/uio.h>
#include <stdlib.h>
#define COUNT (10)
#define LEN (1024)
#define ARRAY_SIZE(arr) ((sizeof(arr) / sizeof(arr[0])))
/* Defined hash functions for DH-HMAC-CHAP authentication */
enum {
NVME_AUTH_HASH_SHA256 = 0x01,
NVME_AUTH_HASH_SHA384 = 0x02,
NVME_AUTH_HASH_SHA512 = 0x03,
NVME_AUTH_HASH_INVALID = 0xff,
};
static struct nvme_dhchap_hash_map {
int len;
const char *hmac;
const char *digest;
} hash_map[] = {
[NVME_AUTH_HASH_SHA256] = { .len = 32,
.hmac = "hmac(sha256)",
.digest = "sha256"
},
[NVME_AUTH_HASH_SHA384] = { .len = 48,
.hmac = "hmac(sha384)",
.digest = "sha384"
},
[NVME_AUTH_HASH_SHA512] = { .len = 64,
.hmac = "hmac(sha512)",
.digest = "sha512"
},
};
const char *nvme_auth_hmac_name(unsigned int hmac_id)
{
if ((hmac_id > ARRAY_SIZE(hash_map)) || !hash_map[hmac_id].hmac)
return NULL;
return hash_map[hmac_id].hmac;
}
const char *nvme_auth_digest_name(unsigned int hmac_id)
{
if ((hmac_id > ARRAY_SIZE(hash_map)) || !hash_map[hmac_id].hmac)
return NULL;
return hash_map[hmac_id].digest;
}
size_t nvme_auth_hmac_hash_len(unsigned int hmac_id)
{
if ((hmac_id > ARRAY_SIZE(hash_map)) || !hash_map[hmac_id].hmac)
return 0;
return hash_map[hmac_id].len;
}
unsigned int nvme_auth_hmac_id(const char *hmac_name)
{
int i;
for (i = 0; i < ARRAY_SIZE(hash_map); i++) {
if (!hash_map[i].hmac)
continue;
if (!strncmp(hash_map[i].hmac, hmac_name,
strlen(hash_map[i].hmac)))
return i;
}
return NVME_AUTH_HASH_INVALID;
}
int main(void)
{
printf("-------------------------------------------------------\n");
printf("hmac_id = 0x%s name 0x%x\n", "hmac(sha256)",
nvme_auth_hmac_id("hmac(sha256)"));
printf("hmac_id = 0x%s name 0x%x\n", "hmac(sha384)",
nvme_auth_hmac_id("hmac(sha384)"));
printf("hmac_id = 0x%s name 0x%x\n", "hmac(sha512)",
nvme_auth_hmac_id("hmac(sha512)"));
printf("hmac_id = 0x%s name 0x%x\n", "",
nvme_auth_hmac_id(""));
printf("hmac_id = 0x%s name 0x%x\n", "asdfadsf",
nvme_auth_hmac_id("asdfadsf"));
printf("-------------------------------------------------------\n");
printf("hmac_id = 0x%x name %s\n", NVME_AUTH_HASH_SHA256,
nvme_auth_hmac_name(NVME_AUTH_HASH_SHA256));
printf("hmac_id = 0x%x name %s\n", NVME_AUTH_HASH_SHA384,
nvme_auth_hmac_name(NVME_AUTH_HASH_SHA384));
printf("hmac_id = 0x%x name %s\n", NVME_AUTH_HASH_SHA512,
nvme_auth_hmac_name(NVME_AUTH_HASH_SHA512));
printf("hmac_id = 0x%x name %s\n", 0x05,
nvme_auth_hmac_name(0x05));
printf("hmac_id = 0x%x name %s\n", 0x0ff,
nvme_auth_hmac_name(0xff));
printf("hmac_id = 0x%x name %s\n", 0x0ff1,
nvme_auth_hmac_name(0xff1));
printf("-------------------------------------------------------\n");
printf("hmac_id = 0x%x digest %s\n", NVME_AUTH_HASH_SHA256,
nvme_auth_digest_name(NVME_AUTH_HASH_SHA256));
printf("hmac_id = 0x%x digest %s\n", NVME_AUTH_HASH_SHA384,
nvme_auth_digest_name(NVME_AUTH_HASH_SHA384));
printf("hmac_id = 0x%x digest %s\n", NVME_AUTH_HASH_SHA512,
nvme_auth_digest_name(NVME_AUTH_HASH_SHA512));
printf("hmac_id = 0x%x digest %s\n", 0x05,
nvme_auth_digest_name(0x05));
printf("hmac_id = 0x%x digest %s\n", 0x0ff,
nvme_auth_digest_name(0xff));
printf("hmac_id = 0x%x digest %s\n", 0x0ff1,
nvme_auth_digest_name(0xff1));
printf("-------------------------------------------------------\n");
printf("hmac_id = 0x%x len %d\n", NVME_AUTH_HASH_SHA256,
nvme_auth_hmac_hash_len(NVME_AUTH_HASH_SHA256));
printf("hmac_id = 0x%x len %d\n", NVME_AUTH_HASH_SHA384,
nvme_auth_hmac_hash_len(NVME_AUTH_HASH_SHA384));
printf("hmac_id = 0x%x len %d\n", NVME_AUTH_HASH_SHA512,
nvme_auth_hmac_hash_len(NVME_AUTH_HASH_SHA512));
printf("hmac_id = 0x%x len %d\n", 0x05,
nvme_auth_hmac_hash_len(0x05));
printf("hmac_id = 0x%x len %d\n", 0x0ff,
nvme_auth_hmac_hash_len(0xff));
printf("hmac_id = 0x%x len %d\n", 0x0ff1,
nvme_auth_hmac_hash_len(0xff1));
return 0;
}
nvme (nvme-5.18) # gcc a.c
nvme (nvme-5.18) # ./a.out
-------------------------------------------------------
hmac_id = 0xhmac(sha256) name 0x1
hmac_id = 0xhmac(sha384) name 0x2
hmac_id = 0xhmac(sha512) name 0x3
hmac_id = 0x name 0xff
hmac_id = 0xasdfadsf name 0xff
-------------------------------------------------------
hmac_id = 0x1 name hmac(sha256)
hmac_id = 0x2 name hmac(sha384)
hmac_id = 0x3 name hmac(sha512)
hmac_id = 0x5 name (null)
hmac_id = 0xff name (null)
hmac_id = 0xff1 name (null)
-------------------------------------------------------
hmac_id = 0x1 digest sha256
hmac_id = 0x2 digest sha384
hmac_id = 0x3 digest sha512
hmac_id = 0x5 digest (null)
hmac_id = 0xff digest (null)
hmac_id = 0xff1 digest (null)
-------------------------------------------------------
hmac_id = 0x1 len 32
hmac_id = 0x2 len 48
hmac_id = 0x3 len 64
hmac_id = 0x5 len 0
hmac_id = 0xff len 0
hmac_id = 0xff1 len 0
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