diff options
Diffstat (limited to 'drivers/nvme/common/keyring.c')
| -rw-r--r-- | drivers/nvme/common/keyring.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/nvme/common/keyring.c b/drivers/nvme/common/keyring.c index 494dd365052e..f8d9a208397b 100644 --- a/drivers/nvme/common/keyring.c +++ b/drivers/nvme/common/keyring.c @@ -5,6 +5,7 @@ #include <linux/module.h> #include <linux/seq_file.h> +#include <linux/key.h> #include <linux/key-type.h> #include <keys/user-type.h> #include <linux/nvme.h> @@ -103,6 +104,53 @@ static struct key *nvme_tls_psk_lookup(struct key *keyring, return key_ref_to_ptr(keyref); } +/* + * NVMe PSK priority list + * + * 'Retained' PSKs (ie 'generated == false') + * should be preferred to 'generated' PSKs, + * and SHA-384 should be preferred to SHA-256. + */ +struct nvme_tls_psk_priority_list { + bool generated; + enum nvme_tcp_tls_cipher cipher; +} nvme_tls_psk_prio[] = { + { .generated = false, + .cipher = NVME_TCP_TLS_CIPHER_SHA384, }, + { .generated = false, + .cipher = NVME_TCP_TLS_CIPHER_SHA256, }, + { .generated = true, + .cipher = NVME_TCP_TLS_CIPHER_SHA384, }, + { .generated = true, + .cipher = NVME_TCP_TLS_CIPHER_SHA256, }, +}; + +/* + * nvme_tls_psk_default - Return the preferred PSK to use for TLS ClientHello + */ +key_serial_t nvme_tls_psk_default(struct key *keyring, + const char *hostnqn, const char *subnqn) +{ + struct key *tls_key; + key_serial_t tls_key_id; + int prio; + + for (prio = 0; prio < ARRAY_SIZE(nvme_tls_psk_prio); prio++) { + bool generated = nvme_tls_psk_prio[prio].generated; + enum nvme_tcp_tls_cipher cipher = nvme_tls_psk_prio[prio].cipher; + + tls_key = nvme_tls_psk_lookup(keyring, hostnqn, subnqn, + cipher, generated); + if (!IS_ERR(tls_key)) { + tls_key_id = tls_key->serial; + key_put(tls_key); + return tls_key_id; + } + } + return 0; +} +EXPORT_SYMBOL_GPL(nvme_tls_psk_default); + int nvme_keyring_init(void) { int err; |