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-rw-r--r--block/sed-opal.c174
1 files changed, 172 insertions, 2 deletions
diff --git a/block/sed-opal.c b/block/sed-opal.c
index e2aed7f4ebdf..6d7f25d1711b 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -20,6 +20,9 @@
#include <linux/sed-opal.h>
#include <linux/string.h>
#include <linux/kdev_t.h>
+#include <linux/key.h>
+#include <linux/key-type.h>
+#include <keys/user-type.h>
#include "opal_proto.h"
@@ -29,6 +32,8 @@
/* Number of bytes needed by cmd_finalize. */
#define CMD_FINALIZE_BYTES_NEEDED 7
+static struct key *sed_opal_keyring;
+
struct opal_step {
int (*fn)(struct opal_dev *dev, void *data);
void *data;
@@ -269,6 +274,101 @@ static void print_buffer(const u8 *ptr, u32 length)
#endif
}
+/*
+ * Allocate/update a SED Opal key and add it to the SED Opal keyring.
+ */
+static int update_sed_opal_key(const char *desc, u_char *key_data, int keylen)
+{
+ key_ref_t kr;
+
+ if (!sed_opal_keyring)
+ return -ENOKEY;
+
+ kr = key_create_or_update(make_key_ref(sed_opal_keyring, true), "user",
+ desc, (const void *)key_data, keylen,
+ KEY_USR_VIEW | KEY_USR_SEARCH | KEY_USR_WRITE,
+ KEY_ALLOC_NOT_IN_QUOTA | KEY_ALLOC_BUILT_IN |
+ KEY_ALLOC_BYPASS_RESTRICTION);
+ if (IS_ERR(kr)) {
+ pr_err("Error adding SED key (%ld)\n", PTR_ERR(kr));
+ return PTR_ERR(kr);
+ }
+
+ return 0;
+}
+
+/*
+ * Read a SED Opal key from the SED Opal keyring.
+ */
+static int read_sed_opal_key(const char *key_name, u_char *buffer, int buflen)
+{
+ int ret;
+ key_ref_t kref;
+ struct key *key;
+
+ if (!sed_opal_keyring)
+ return -ENOKEY;
+
+ kref = keyring_search(make_key_ref(sed_opal_keyring, true),
+ &key_type_user, key_name, true);
+
+ if (IS_ERR(kref))
+ ret = PTR_ERR(kref);
+
+ key = key_ref_to_ptr(kref);
+ down_read(&key->sem);
+ ret = key_validate(key);
+ if (ret == 0) {
+ if (buflen > key->datalen)
+ buflen = key->datalen;
+
+ ret = key->type->read(key, (char *)buffer, buflen);
+ }
+ up_read(&key->sem);
+
+ key_ref_put(kref);
+
+ return ret;
+}
+
+static int opal_get_key(struct opal_dev *dev, struct opal_key *key)
+{
+ int ret = 0;
+
+ switch (key->key_type) {
+ case OPAL_INCLUDED:
+ /* the key is ready to use */
+ break;
+ case OPAL_KEYRING:
+ /* the key is in the keyring */
+ ret = read_sed_opal_key(OPAL_AUTH_KEY, key->key, OPAL_KEY_MAX);
+ if (ret > 0) {
+ if (ret > U8_MAX) {
+ ret = -ENOSPC;
+ goto error;
+ }
+ key->key_len = ret;
+ key->key_type = OPAL_INCLUDED;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ if (ret < 0)
+ goto error;
+
+ /* must have a PEK by now or it's an error */
+ if (key->key_type != OPAL_INCLUDED || key->key_len == 0) {
+ ret = -EINVAL;
+ goto error;
+ }
+ return 0;
+error:
+ pr_debug("Error getting password: %d\n", ret);
+ return ret;
+}
+
static bool check_tper(const void *data)
{
const struct d0_tper_features *tper = data;
@@ -2459,6 +2559,9 @@ static int opal_secure_erase_locking_range(struct opal_dev *dev,
};
int ret;
+ ret = opal_get_key(dev, &opal_session->opal_key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, erase_steps, ARRAY_SIZE(erase_steps));
@@ -2492,6 +2595,9 @@ static int opal_revertlsp(struct opal_dev *dev, struct opal_revert_lsp *rev)
};
int ret;
+ ret = opal_get_key(dev, &rev->key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, steps, ARRAY_SIZE(steps));
@@ -2510,6 +2616,9 @@ static int opal_erase_locking_range(struct opal_dev *dev,
};
int ret;
+ ret = opal_get_key(dev, &opal_session->opal_key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, erase_steps, ARRAY_SIZE(erase_steps));
@@ -2538,6 +2647,9 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
opal_mbr->enable_disable != OPAL_MBR_DISABLE)
return -EINVAL;
+ ret = opal_get_key(dev, &opal_mbr->key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
@@ -2563,6 +2675,9 @@ static int opal_set_mbr_done(struct opal_dev *dev,
mbr_done->done_flag != OPAL_MBR_NOT_DONE)
return -EINVAL;
+ ret = opal_get_key(dev, &mbr_done->key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
@@ -2584,6 +2699,9 @@ static int opal_write_shadow_mbr(struct opal_dev *dev,
if (info->size == 0)
return 0;
+ ret = opal_get_key(dev, &info->key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
@@ -2641,6 +2759,9 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
return -EINVAL;
}
+ ret = opal_get_key(dev, &lk_unlk->session.opal_key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, steps, ARRAY_SIZE(steps));
@@ -2663,6 +2784,10 @@ static int opal_reverttper(struct opal_dev *dev, struct opal_key *opal, bool psi
int ret;
+ ret = opal_get_key(dev, opal);
+
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
if (psid)
@@ -2763,6 +2888,9 @@ static int opal_lock_unlock(struct opal_dev *dev,
if (lk_unlk->session.who > OPAL_USER9)
return -EINVAL;
+ ret = opal_get_key(dev, &lk_unlk->session.opal_key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
opal_lock_check_for_saved_key(dev, lk_unlk);
ret = __opal_lock_unlock(dev, lk_unlk);
@@ -2786,6 +2914,9 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
if (!dev)
return -ENODEV;
+ ret = opal_get_key(dev, opal);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, owner_steps, ARRAY_SIZE(owner_steps));
@@ -2808,6 +2939,9 @@ static int opal_activate_lsp(struct opal_dev *dev,
if (!opal_lr_act->num_lrs || opal_lr_act->num_lrs > OPAL_MAX_LRS)
return -EINVAL;
+ ret = opal_get_key(dev, &opal_lr_act->key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, active_steps, ARRAY_SIZE(active_steps));
@@ -2826,6 +2960,9 @@ static int opal_setup_locking_range(struct opal_dev *dev,
};
int ret;
+ ret = opal_get_key(dev, &opal_lrs->session.opal_key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, lr_steps, ARRAY_SIZE(lr_steps));
@@ -2879,6 +3016,14 @@ static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
ret = execute_steps(dev, pw_steps, ARRAY_SIZE(pw_steps));
mutex_unlock(&dev->dev_lock);
+ if (ret)
+ return ret;
+
+ /* update keyring with new password */
+ ret = update_sed_opal_key(OPAL_AUTH_KEY,
+ opal_pw->new_user_pw.opal_key.key,
+ opal_pw->new_user_pw.opal_key.key_len);
+
return ret;
}
@@ -2899,6 +3044,9 @@ static int opal_activate_user(struct opal_dev *dev,
return -EINVAL;
}
+ ret = opal_get_key(dev, &opal_session->opal_key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
ret = execute_steps(dev, act_steps, ARRAY_SIZE(act_steps));
@@ -2985,6 +3133,9 @@ static int opal_generic_read_write_table(struct opal_dev *dev,
{
int ret, bit_set;
+ ret = opal_get_key(dev, &rw_tbl->key);
+ if (ret)
+ return ret;
mutex_lock(&dev->dev_lock);
setup_opal_dev(dev);
@@ -3053,9 +3204,9 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg)
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!dev)
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
if (!(dev->flags & OPAL_FL_SUPPORTED))
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
if (cmd & IOC_IN) {
p = memdup_user(arg, _IOC_SIZE(cmd));
@@ -3137,3 +3288,22 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg)
return ret;
}
EXPORT_SYMBOL_GPL(sed_ioctl);
+
+static int __init sed_opal_init(void)
+{
+ struct key *kr;
+
+ kr = keyring_alloc(".sed_opal",
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, current_cred(),
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW |
+ KEY_USR_READ | KEY_USR_SEARCH | KEY_USR_WRITE,
+ KEY_ALLOC_NOT_IN_QUOTA,
+ NULL, NULL);
+ if (IS_ERR(kr))
+ return PTR_ERR(kr);
+
+ sed_opal_keyring = kr;
+
+ return 0;
+}
+late_initcall(sed_opal_init);
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-11 01:31:41 +0300