[PATCHv6 0/8] nvme: fixes for secure concatenation

[PATCHv6 0/8] nvme: fixes for secure concatenation

[Hannes Reinecke]

Hi all,

here's a list of fixes split off from the secure concatenation patchset
as they really are unrelated and just are assorted fixes to get things
rolling.
The most important here is the first patch, which implements TP8018 to
support the 'version 1' format for TLS PSK identifiers. And it also
updates the sysfs interface to allow us to re-construct the nvme-cli
commandline from sysfs attributes.

As usual, comments and reviews are welcome.

Hannes Reinecke (8):
  nvme-keyring: restrict match length for version '1' identifiers
  nvme-tcp: sanitize TLS key handling
  nvme-tcp: check for invalidated or revoked key
  nvme: add a newline to the 'tls_key' sysfs attribute
  nvme-sysfs: add 'tls_configured_key' sysfs attribute
  nvme-sysfs: add 'tls_keyring' attribute
  nvmet-auth: allow to clear DH-HMAC-CHAP keys
  nvme-target: do not check authentication status for admin commands
    twice

 drivers/nvme/common/keyring.c   | 53 ++++++++++++++++++++++++++++-----
 drivers/nvme/host/core.c        |  1 -
 drivers/nvme/host/fabrics.c     |  2 +-
 drivers/nvme/host/nvme.h        |  2 +-
 drivers/nvme/host/sysfs.c       | 34 +++++++++++++++++++--
 drivers/nvme/host/tcp.c         | 49 +++++++++++++++++++++---------
 drivers/nvme/target/admin-cmd.c |  2 --
 drivers/nvme/target/auth.c      | 12 ++++++++
 include/linux/nvme-keyring.h    |  3 +-
 9 files changed, 129 insertions(+), 29 deletions(-)

-- 
2.35.3

[PATCH 1/8] nvme-keyring: restrict match length for version '1' identifiers

[Hannes Reinecke]

TP8018 changed the TLS PSK identifiers to append a PSK hash value,
so to lookup identifiers we should just consider the length of
the match value, not the length of the identifiers to compare
against.
And we should modify the PSK lookup algorithm to prefer v1 identifiers
as they can be uniquely identified.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/common/keyring.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/common/keyring.c b/drivers/nvme/common/keyring.c
index 6f7e7a8fa5ae..c60ebbdc52b8 100644
--- a/drivers/nvme/common/keyring.c
+++ b/drivers/nvme/common/keyring.c
@@ -36,14 +36,12 @@ static bool nvme_tls_psk_match(const struct key *key,
 		pr_debug("%s: no key description\n", __func__);
 		return false;
 	}
-	match_len = strlen(key->description);
-	pr_debug("%s: id %s len %zd\n", __func__, key->description, match_len);
-
 	if (!match_data->raw_data) {
 		pr_debug("%s: no match data\n", __func__);
 		return false;
 	}
 	match_id = match_data->raw_data;
+	match_len = strlen(match_id);
 	pr_debug("%s: match '%s' '%s' len %zd\n",
 		 __func__, match_id, key->description, match_len);
 	return !memcmp(key->description, match_id, match_len);
@@ -71,7 +69,7 @@ static struct key_type nvme_tls_psk_key_type = {
 
 static struct key *nvme_tls_psk_lookup(struct key *keyring,
 		const char *hostnqn, const char *subnqn,
-		int hmac, bool generated)
+		u8 hmac, u8 psk_ver, bool generated)
 {
 	char *identity;
 	size_t identity_len = (NVMF_NQN_SIZE) * 2 + 11;
@@ -82,8 +80,8 @@ static struct key *nvme_tls_psk_lookup(struct key *keyring,
 	if (!identity)
 		return ERR_PTR(-ENOMEM);
 
-	snprintf(identity, identity_len, "NVMe0%c%02d %s %s",
-		 generated ? 'G' : 'R', hmac, hostnqn, subnqn);
+	snprintf(identity, identity_len, "NVMe%u%c%02u %s %s",
+		 psk_ver, generated ? 'G' : 'R', hmac, hostnqn, subnqn);
 
 	if (!keyring)
 		keyring = nvme_keyring;
@@ -109,19 +107,38 @@ static struct key *nvme_tls_psk_lookup(struct key *keyring,
  *
  * 'Retained' PSKs (ie 'generated == false')
  * should be preferred to 'generated' PSKs,
+ * PSKs with hash (psk_ver 1) should be
+ * preferred to PSKs without (psk_ver 0),
  * and SHA-384 should be preferred to SHA-256.
  */
 static struct nvme_tls_psk_priority_list {
 	bool generated;
+	u8 psk_ver;
 	enum nvme_tcp_tls_cipher cipher;
 } nvme_tls_psk_prio[] = {
 	{ .generated = false,
+	  .psk_ver = 1,
+	  .cipher = NVME_TCP_TLS_CIPHER_SHA384, },
+	{ .generated = false,
+	  .psk_ver = 1,
+	  .cipher = NVME_TCP_TLS_CIPHER_SHA256, },
+	{ .generated = false,
+	  .psk_ver = 0,
 	  .cipher = NVME_TCP_TLS_CIPHER_SHA384, },
 	{ .generated = false,
+	  .psk_ver = 0,
+	  .cipher = NVME_TCP_TLS_CIPHER_SHA256, },
+	{ .generated = true,
+	  .psk_ver = 1,
+	  .cipher = NVME_TCP_TLS_CIPHER_SHA384, },
+	{ .generated = true,
+	  .psk_ver = 1,
 	  .cipher = NVME_TCP_TLS_CIPHER_SHA256, },
 	{ .generated = true,
+	  .psk_ver = 0,
 	  .cipher = NVME_TCP_TLS_CIPHER_SHA384, },
 	{ .generated = true,
+	  .psk_ver = 0,
 	  .cipher = NVME_TCP_TLS_CIPHER_SHA256, },
 };
 
@@ -137,10 +154,11 @@ key_serial_t nvme_tls_psk_default(struct key *keyring,
 
 	for (prio = 0; prio < ARRAY_SIZE(nvme_tls_psk_prio); prio++) {
 		bool generated = nvme_tls_psk_prio[prio].generated;
+		u8 ver = nvme_tls_psk_prio[prio].psk_ver;
 		enum nvme_tcp_tls_cipher cipher = nvme_tls_psk_prio[prio].cipher;
 
 		tls_key = nvme_tls_psk_lookup(keyring, hostnqn, subnqn,
-					      cipher, generated);
+					      cipher, ver, generated);
 		if (!IS_ERR(tls_key)) {
 			tls_key_id = tls_key->serial;
 			key_put(tls_key);
-- 
2.35.3

[PATCH 2/8] nvme-tcp: sanitize TLS key handling

[Hannes Reinecke]

There is a difference between TLS configured (ie the user has
provisioned/requested a key) and TLS enabled (ie the connection
is encrypted with TLS). This becomes important for secure concatenation,
where the initial authentication is run on an unencrypted connection
(ie with TLS configured, but not enabled), and then the queue is reset to
run over TLS (ie TLS configured _and_ enabled).
So to differentiate between those two states store the generated
key in opts->tls_key (as we're using the same TLS key for all queues),
the key serial of the resulting TLS handshake in ctrl->tls_pskid
(to signal that TLS on the admin queue is enabled), and a simple
flag for the queues to indicated that TLS has been enabled.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
 drivers/nvme/host/core.c  |  1 -
 drivers/nvme/host/nvme.h  |  2 +-
 drivers/nvme/host/sysfs.c |  4 ++--
 drivers/nvme/host/tcp.c   | 47 ++++++++++++++++++++++++++++-----------
 4 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index e78ef31eeef0..663fa14162ab 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4675,7 +4675,6 @@ static void nvme_free_ctrl(struct device *dev)
 
 	if (!subsys || ctrl->instance != subsys->instance)
 		ida_free(&nvme_instance_ida, ctrl->instance);
-	key_put(ctrl->tls_key);
 	nvme_free_cels(ctrl);
 	nvme_mpath_uninit(ctrl);
 	cleanup_srcu_struct(&ctrl->srcu);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 9ac587e64166..185fb986a5cc 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -373,7 +373,7 @@ struct nvme_ctrl {
 	struct nvme_dhchap_key *ctrl_key;
 	u16 transaction;
 #endif
-	struct key *tls_key;
+	key_serial_t tls_pskid;
 
 	/* Power saving configuration */
 	u64 ps_max_latency_us;
diff --git a/drivers/nvme/host/sysfs.c b/drivers/nvme/host/sysfs.c
index ba05faaac562..72675b59a7a7 100644
--- a/drivers/nvme/host/sysfs.c
+++ b/drivers/nvme/host/sysfs.c
@@ -670,9 +670,9 @@ static ssize_t tls_key_show(struct device *dev,
 {
 	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
 
-	if (!ctrl->tls_key)
+	if (!ctrl->tls_pskid)
 		return 0;
-	return sysfs_emit(buf, "%08x", key_serial(ctrl->tls_key));
+	return sysfs_emit(buf, "%08x", ctrl->tls_pskid);
 }
 static DEVICE_ATTR_RO(tls_key);
 #endif
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index a2a47d3ab99f..92ad5b8cc1b4 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -165,6 +165,7 @@ struct nvme_tcp_queue {
 
 	bool			hdr_digest;
 	bool			data_digest;
+	bool			tls_enabled;
 	struct ahash_request	*rcv_hash;
 	struct ahash_request	*snd_hash;
 	__le32			exp_ddgst;
@@ -213,7 +214,15 @@ static inline int nvme_tcp_queue_id(struct nvme_tcp_queue *queue)
 	return queue - queue->ctrl->queues;
 }
 
-static inline bool nvme_tcp_tls(struct nvme_ctrl *ctrl)
+static inline bool nvme_tcp_tls_enabled(struct nvme_tcp_queue *queue)
+{
+	if (!IS_ENABLED(CONFIG_NVME_TCP_TLS))
+		return 0;
+
+	return queue->tls_enabled;
+}
+
+static inline bool nvme_tcp_tls_configured(struct nvme_ctrl *ctrl)
 {
 	if (!IS_ENABLED(CONFIG_NVME_TCP_TLS))
 		return 0;
@@ -368,7 +377,7 @@ static inline bool nvme_tcp_queue_has_pending(struct nvme_tcp_queue *queue)
 
 static inline bool nvme_tcp_queue_more(struct nvme_tcp_queue *queue)
 {
-	return !nvme_tcp_tls(&queue->ctrl->ctrl) &&
+	return !nvme_tcp_tls_enabled(queue) &&
 		nvme_tcp_queue_has_pending(queue);
 }
 
@@ -1427,7 +1436,7 @@ static int nvme_tcp_init_connection(struct nvme_tcp_queue *queue)
 	memset(&msg, 0, sizeof(msg));
 	iov.iov_base = icresp;
 	iov.iov_len = sizeof(*icresp);
-	if (nvme_tcp_tls(&queue->ctrl->ctrl)) {
+	if (nvme_tcp_tls_enabled(queue)) {
 		msg.msg_control = cbuf;
 		msg.msg_controllen = sizeof(cbuf);
 	}
@@ -1439,7 +1448,7 @@ static int nvme_tcp_init_connection(struct nvme_tcp_queue *queue)
 		goto free_icresp;
 	}
 	ret = -ENOTCONN;
-	if (nvme_tcp_tls(&queue->ctrl->ctrl)) {
+	if (nvme_tcp_tls_enabled(queue)) {
 		ctype = tls_get_record_type(queue->sock->sk,
 					    (struct cmsghdr *)cbuf);
 		if (ctype != TLS_RECORD_TYPE_DATA) {
@@ -1587,7 +1596,10 @@ static void nvme_tcp_tls_done(void *data, int status, key_serial_t pskid)
 			 qid, pskid);
 		queue->tls_err = -ENOKEY;
 	} else {
-		ctrl->ctrl.tls_key = tls_key;
+		queue->tls_enabled = true;
+		if (qid == 0)
+			ctrl->ctrl.tls_pskid = key_serial(tls_key);
+		key_put(tls_key);
 		queue->tls_err = 0;
 	}
 
@@ -1768,7 +1780,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl, int qid,
 	}
 
 	/* If PSKs are configured try to start TLS */
-	if (IS_ENABLED(CONFIG_NVME_TCP_TLS) && pskid) {
+	if (nvme_tcp_tls_configured(nctrl) && pskid) {
 		ret = nvme_tcp_start_tls(nctrl, queue, pskid);
 		if (ret)
 			goto err_init_connect;
@@ -1829,6 +1841,8 @@ static void nvme_tcp_stop_queue(struct nvme_ctrl *nctrl, int qid)
 	mutex_lock(&queue->queue_lock);
 	if (test_and_clear_bit(NVME_TCP_Q_LIVE, &queue->flags))
 		__nvme_tcp_stop_queue(queue);
+	/* Stopping the queue will disable TLS */
+	queue->tls_enabled = false;
 	mutex_unlock(&queue->queue_lock);
 }
 
@@ -1925,16 +1939,17 @@ static int nvme_tcp_alloc_admin_queue(struct nvme_ctrl *ctrl)
 	int ret;
 	key_serial_t pskid = 0;
 
-	if (nvme_tcp_tls(ctrl)) {
+	if (nvme_tcp_tls_configured(ctrl)) {
 		if (ctrl->opts->tls_key)
 			pskid = key_serial(ctrl->opts->tls_key);
-		else
+		else {
 			pskid = nvme_tls_psk_default(ctrl->opts->keyring,
 						      ctrl->opts->host->nqn,
 						      ctrl->opts->subsysnqn);
-		if (!pskid) {
-			dev_err(ctrl->device, "no valid PSK found\n");
-			return -ENOKEY;
+			if (!pskid) {
+				dev_err(ctrl->device, "no valid PSK found\n");
+				return -ENOKEY;
+			}
 		}
 	}
 
@@ -1957,13 +1972,14 @@ static int __nvme_tcp_alloc_io_queues(struct nvme_ctrl *ctrl)
 {
 	int i, ret;
 
-	if (nvme_tcp_tls(ctrl) && !ctrl->tls_key) {
+	if (nvme_tcp_tls_configured(ctrl) && !ctrl->tls_pskid) {
 		dev_err(ctrl->device, "no PSK negotiated\n");
 		return -ENOKEY;
 	}
+
 	for (i = 1; i < ctrl->queue_count; i++) {
 		ret = nvme_tcp_alloc_queue(ctrl, i,
-				key_serial(ctrl->tls_key));
+				ctrl->tls_pskid);
 		if (ret)
 			goto out_free_queues;
 	}
@@ -2144,6 +2160,11 @@ static void nvme_tcp_teardown_admin_queue(struct nvme_ctrl *ctrl,
 	if (remove)
 		nvme_unquiesce_admin_queue(ctrl);
 	nvme_tcp_destroy_admin_queue(ctrl, remove);
+	if (ctrl->tls_pskid) {
+		dev_dbg(ctrl->device, "Wipe negotiated TLS_PSK %08x\n",
+			ctrl->tls_pskid);
+		ctrl->tls_pskid = 0;
+	}
 }
 
 static void nvme_tcp_teardown_io_queues(struct nvme_ctrl *ctrl,
-- 
2.35.3

[PATCH 3/8] nvme-tcp: check for invalidated or revoked key

[Hannes Reinecke]

key_lookup() will always return a key, even if that key is revoked
or invalidated. So check for invalid keys before continuing.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/common/keyring.c | 21 +++++++++++++++++++++
 drivers/nvme/host/fabrics.c   |  2 +-
 drivers/nvme/host/tcp.c       |  2 +-
 include/linux/nvme-keyring.h  |  3 ++-
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/common/keyring.c b/drivers/nvme/common/keyring.c
index c60ebbdc52b8..5b886fd6c3e7 100644
--- a/drivers/nvme/common/keyring.c
+++ b/drivers/nvme/common/keyring.c
@@ -20,6 +20,27 @@ key_serial_t nvme_keyring_id(void)
 }
 EXPORT_SYMBOL_GPL(nvme_keyring_id);
 
+static bool nvme_tls_psk_revoked(struct key *psk)
+{
+	return (test_bit(KEY_FLAG_REVOKED, &psk->flags) ||
+		test_bit(KEY_FLAG_INVALIDATED, &psk->flags));
+}
+
+struct key *nvme_tls_key_lookup(key_serial_t key_id)
+{
+	struct key *key = key_lookup(key_id);
+	if (IS_ERR(key)) {
+		pr_err("key id %08x not found\n", key_id);
+		return key;
+	}
+	if (nvme_tls_psk_revoked(key)) {
+		pr_err("key id %08x revoked\n", key_id);
+		return ERR_PTR(-EKEYREVOKED);
+	}
+	return key;
+}
+EXPORT_SYMBOL_GPL(nvme_tls_key_lookup);
+
 static void nvme_tls_psk_describe(const struct key *key, struct seq_file *m)
 {
 	seq_puts(m, key->description);
diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index f5f545fa0103..432efcbf9e2f 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -665,7 +665,7 @@ static struct key *nvmf_parse_key(int key_id)
 		return ERR_PTR(-EINVAL);
 	}
 
-	key = key_lookup(key_id);
+	key = nvme_tls_key_lookup(key_id);
 	if (IS_ERR(key))
 		pr_err("key id %08x not found\n", key_id);
 	else
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 92ad5b8cc1b4..5885aa452aa1 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1590,7 +1590,7 @@ static void nvme_tcp_tls_done(void *data, int status, key_serial_t pskid)
 		goto out_complete;
 	}
 
-	tls_key = key_lookup(pskid);
+	tls_key = nvme_tls_key_lookup(pskid);
 	if (IS_ERR(tls_key)) {
 		dev_warn(ctrl->ctrl.device, "queue %d: Invalid key %x\n",
 			 qid, pskid);
diff --git a/include/linux/nvme-keyring.h b/include/linux/nvme-keyring.h
index e10333d78dbb..e092e3e6ffb2 100644
--- a/include/linux/nvme-keyring.h
+++ b/include/linux/nvme-keyring.h
@@ -12,7 +12,7 @@ key_serial_t nvme_tls_psk_default(struct key *keyring,
 		const char *hostnqn, const char *subnqn);
 
 key_serial_t nvme_keyring_id(void);
-
+struct key *nvme_tls_key_lookup(key_serial_t key_id);
 #else
 
 static inline key_serial_t nvme_tls_psk_default(struct key *keyring,
@@ -24,5 +24,6 @@ static inline key_serial_t nvme_keyring_id(void)
 {
 	return 0;
 }
+static inline struct key *nvme_tls_key_lookup(key_serial_t key_id) { return ERR_PTR(-ENOTSUPP); }
 #endif /* !CONFIG_NVME_KEYRING */
 #endif /* _NVME_KEYRING_H */
-- 
2.35.3

[PATCH 4/8] nvme: add a newline to the 'tls_key' sysfs attribute

[Hannes Reinecke]

Print a newline for easier userspace handling.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/host/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/sysfs.c b/drivers/nvme/host/sysfs.c
index 72675b59a7a7..c391ad6c5a88 100644
--- a/drivers/nvme/host/sysfs.c
+++ b/drivers/nvme/host/sysfs.c
@@ -672,7 +672,7 @@ static ssize_t tls_key_show(struct device *dev,
 
 	if (!ctrl->tls_pskid)
 		return 0;
-	return sysfs_emit(buf, "%08x", ctrl->tls_pskid);
+	return sysfs_emit(buf, "%08x\n", ctrl->tls_pskid);
 }
 static DEVICE_ATTR_RO(tls_key);
 #endif
-- 
2.35.3

[PATCH 5/8] nvme-sysfs: add 'tls_configured_key' sysfs attribute

[Hannes Reinecke]

There is a difference between the negotiated TLS key (which is
always present for a TLS encrypted connection) and the configured
TLS key (which is specified with the --tls_key command line option).
To differentate between these two add a new sysfs attribute
'tls_configured_key' to hold the specified on the command line.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
 drivers/nvme/host/sysfs.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/nvme/host/sysfs.c b/drivers/nvme/host/sysfs.c
index c391ad6c5a88..62f03aa530c8 100644
--- a/drivers/nvme/host/sysfs.c
+++ b/drivers/nvme/host/sysfs.c
@@ -675,6 +675,16 @@ static ssize_t tls_key_show(struct device *dev,
 	return sysfs_emit(buf, "%08x\n", ctrl->tls_pskid);
 }
 static DEVICE_ATTR_RO(tls_key);
+
+static ssize_t tls_configured_key_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+	struct key *key = ctrl->opts->tls_key;
+
+	return sysfs_emit(buf, "%08x\n", key_serial(key));
+}
+static DEVICE_ATTR_RO(tls_configured_key);
 #endif
 
 static struct attribute *nvme_dev_attrs[] = {
@@ -706,6 +716,7 @@ static struct attribute *nvme_dev_attrs[] = {
 #endif
 #ifdef CONFIG_NVME_TCP_TLS
 	&dev_attr_tls_key.attr,
+	&dev_attr_tls_configured_key.attr,
 #endif
 	&dev_attr_adm_passthru_err_log_enabled.attr,
 	NULL
@@ -741,6 +752,10 @@ static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
 	if (a == &dev_attr_tls_key.attr &&
 	    (!ctrl->opts || strcmp(ctrl->opts->transport, "tcp")))
 		return 0;
+	if (a == &dev_attr_tls_configured_key.attr &&
+	    (!ctrl->opts || !ctrl->opts->tls_key ||
+	     strcmp(ctrl->opts->transport, "tcp")))
+		return 0;
 #endif
 
 	return a->mode;
-- 
2.35.3

[PATCH 6/8] nvme-sysfs: add 'tls_keyring' attribute

[Hannes Reinecke]

Add a 'tls_keyring' attribute to display the contents of the
--keyring option from the connect string. Adding this attribute
allows us to recreate the original connect string from sysfs
settings.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
 drivers/nvme/host/sysfs.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/nvme/host/sysfs.c b/drivers/nvme/host/sysfs.c
index 62f03aa530c8..7a7a4ade59db 100644
--- a/drivers/nvme/host/sysfs.c
+++ b/drivers/nvme/host/sysfs.c
@@ -685,6 +685,16 @@ static ssize_t tls_configured_key_show(struct device *dev,
 	return sysfs_emit(buf, "%08x\n", key_serial(key));
 }
 static DEVICE_ATTR_RO(tls_configured_key);
+
+static ssize_t tls_keyring_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+	struct key *keyring = ctrl->opts->keyring;
+
+	return sysfs_emit(buf, "%s\n", keyring->description);
+}
+static DEVICE_ATTR_RO(tls_keyring);
 #endif
 
 static struct attribute *nvme_dev_attrs[] = {
@@ -717,6 +727,7 @@ static struct attribute *nvme_dev_attrs[] = {
 #ifdef CONFIG_NVME_TCP_TLS
 	&dev_attr_tls_key.attr,
 	&dev_attr_tls_configured_key.attr,
+	&dev_attr_tls_keyring.attr,
 #endif
 	&dev_attr_adm_passthru_err_log_enabled.attr,
 	NULL
@@ -756,6 +767,10 @@ static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
 	    (!ctrl->opts || !ctrl->opts->tls_key ||
 	     strcmp(ctrl->opts->transport, "tcp")))
 		return 0;
+	if (a == &dev_attr_tls_keyring.attr &&
+	    (!ctrl->opts || !ctrl->opts->keyring ||
+	     strcmp(ctrl->opts->transport, "tcp")))
+		return 0;
 #endif
 
 	return a->mode;
-- 
2.35.3

[PATCH 7/8] nvmet-auth: allow to clear DH-HMAC-CHAP keys

[Hannes Reinecke]

As we can set DH-HMAC-CHAP keys, we should also be
able to unset them.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/target/auth.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/nvme/target/auth.c b/drivers/nvme/target/auth.c
index 8bc3f431c77f..7897d02c681d 100644
--- a/drivers/nvme/target/auth.c
+++ b/drivers/nvme/target/auth.c
@@ -25,6 +25,18 @@ int nvmet_auth_set_key(struct nvmet_host *host, const char *secret,
 	unsigned char key_hash;
 	char *dhchap_secret;
 
+	if (!strlen(secret)) {
+		if (set_ctrl) {
+			kfree(host->dhchap_ctrl_secret);
+			host->dhchap_ctrl_secret = NULL;
+			host->dhchap_ctrl_key_hash = 0;
+		} else {
+			kfree(host->dhchap_secret);
+			host->dhchap_secret = NULL;
+			host->dhchap_key_hash = 0;
+		}
+		return 0;
+	}
 	if (sscanf(secret, "DHHC-1:%hhd:%*s", &key_hash) != 1)
 		return -EINVAL;
 	if (key_hash > 3) {
-- 
2.35.3

[PATCH 8/8] nvme-target: do not check authentication status for admin commands twice

[Hannes Reinecke]

nvmet_check_ctrl_status() checks the authentication status, so
we don't need to do that prior to calling it.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/target/admin-cmd.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index f7e1156ac7ec..d64480f01f4a 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -1005,8 +1005,6 @@ u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
 
 	if (nvme_is_fabrics(cmd))
 		return nvmet_parse_fabrics_admin_cmd(req);
-	if (unlikely(!nvmet_check_auth_status(req)))
-		return NVME_SC_AUTH_REQUIRED | NVME_STATUS_DNR;
 	if (nvmet_is_disc_subsys(nvmet_req_subsys(req)))
 		return nvmet_parse_discovery_cmd(req);
 
-- 
2.35.3

Re: [PATCH 1/8] nvme-keyring: restrict match length for version '1' identifiers

[Christoph Hellwig]

On Thu, Jul 18, 2024 at 04:48:51PM +0200, Hannes Reinecke wrote:
> TP8018 changed the TLS PSK identifiers to append a PSK hash value,
> so to lookup identifiers we should just consider the length of
> the match value, not the length of the identifiers to compare
> against.
> And we should modify the PSK lookup algorithm to prefer v1 identifiers
> as they can be uniquely identified.

Can you reword this a bit to remove the weird "we should" and state it
in terms of requirements / recommendations from the standard.  Bonus
points for adding actual references to the specifications.

> @@ -109,19 +107,38 @@ static struct key *nvme_tls_psk_lookup(struct key *keyring,
>   *
>   * 'Retained' PSKs (ie 'generated == false')
>   * should be preferred to 'generated' PSKs,
> + * PSKs with hash (psk_ver 1) should be
> + * preferred to PSKs without (psk_ver 0),
>   * and SHA-384 should be preferred to SHA-256.

Please reflow this to use up 80 characters and make the paragraph easily
readable.

Re: [PATCH 2/8] nvme-tcp: sanitize TLS key handling

[Christoph Hellwig]

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH 3/8] nvme-tcp: check for invalidated or revoked key

[Christoph Hellwig]

> +	return (test_bit(KEY_FLAG_REVOKED, &psk->flags) ||
> +		test_bit(KEY_FLAG_INVALIDATED, &psk->flags));

No need for the outer braces.

> +struct key *nvme_tls_key_lookup(key_serial_t key_id)
> +{
> +	struct key *key = key_lookup(key_id);

Empty line after variable declarations, please.

> +static inline struct key *nvme_tls_key_lookup(key_serial_t key_id) { return ERR_PTR(-ENOTSUPP); }

Please avoid the overly lone line.

Re: [PATCH 4/8] nvme: add a newline to the 'tls_key' sysfs attribute

[Christoph Hellwig]

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH 5/8] nvme-sysfs: add 'tls_configured_key' sysfs attribute

[Christoph Hellwig]

>  #ifdef CONFIG_NVME_TCP_TLS
>  	&dev_attr_tls_key.attr,
> +	&dev_attr_tls_configured_key.attr,
>  #endif
>  	&dev_attr_adm_passthru_err_log_enabled.attr,
>  	NULL
> @@ -741,6 +752,10 @@ static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
>  	if (a == &dev_attr_tls_key.attr &&
>  	    (!ctrl->opts || strcmp(ctrl->opts->transport, "tcp")))
>  		return 0;
> +	if (a == &dev_attr_tls_configured_key.attr &&
> +	    (!ctrl->opts || !ctrl->opts->tls_key ||
> +	     strcmp(ctrl->opts->transport, "tcp")))
> +		return 0;
>  #endif

The check for a specific transport hack was ok for a single attribute,
but it probably is time to have a separate attribute_group provided
by the transport now.  Or maybe wait until we get another one..

>  
>  	return a->mode;
> -- 
> 2.35.3
---end quoted text---

Re: [PATCH 8/8] nvme-target: do not check authentication status for admin commands twice

[Christoph Hellwig]

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH 1/8] nvme-keyring: restrict match length for version '1' identifiers

[Hannes Reinecke]

On 7/19/24 07:34, Christoph Hellwig wrote:
> On Thu, Jul 18, 2024 at 04:48:51PM +0200, Hannes Reinecke wrote:
>> TP8018 changed the TLS PSK identifiers to append a PSK hash value,
>> so to lookup identifiers we should just consider the length of
>> the match value, not the length of the identifiers to compare
>> against.
>> And we should modify the PSK lookup algorithm to prefer v1 identifiers
>> as they can be uniquely identified.
> 
> Can you reword this a bit to remove the weird "we should" and state it
> in terms of requirements / recommendations from the standard.  Bonus
> points for adding actual references to the specifications.
> 
Okay.

>> @@ -109,19 +107,38 @@ static struct key *nvme_tls_psk_lookup(struct key *keyring,
>>    *
>>    * 'Retained' PSKs (ie 'generated == false')
>>    * should be preferred to 'generated' PSKs,
>> + * PSKs with hash (psk_ver 1) should be
>> + * preferred to PSKs without (psk_ver 0),
>>    * and SHA-384 should be preferred to SHA-256.
> 
> Please reflow this to use up 80 characters and make the paragraph easily
> readable.
> 
Sure.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich

Re: [PATCH 5/8] nvme-sysfs: add 'tls_configured_key' sysfs attribute

[Hannes Reinecke]

On 7/19/24 07:44, Christoph Hellwig wrote:
>>   #ifdef CONFIG_NVME_TCP_TLS
>>   	&dev_attr_tls_key.attr,
>> +	&dev_attr_tls_configured_key.attr,
>>   #endif
>>   	&dev_attr_adm_passthru_err_log_enabled.attr,
>>   	NULL
>> @@ -741,6 +752,10 @@ static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
>>   	if (a == &dev_attr_tls_key.attr &&
>>   	    (!ctrl->opts || strcmp(ctrl->opts->transport, "tcp")))
>>   		return 0;
>> +	if (a == &dev_attr_tls_configured_key.attr &&
>> +	    (!ctrl->opts || !ctrl->opts->tls_key ||
>> +	     strcmp(ctrl->opts->transport, "tcp")))
>> +		return 0;
>>   #endif
> 
> The check for a specific transport hack was ok for a single attribute,
> but it probably is time to have a separate attribute_group provided
> by the transport now.  Or maybe wait until we get another one..
> 
Not a bad idea. Will be doing that for the next round.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich