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Date: Wed, 17 Jul 2013 21:43:56 +0100
From: David Howells <dhowells@...hat.com>
To: keyrings@...ux-nfs.org
Cc: linux-security-module@...r.kernel.org, linux-nfs@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] KEYS: Consolidate the concept of an 'index key' for
key access
Consolidate the concept of an 'index key' for accessing keys. The index key
is the search term needed to find a key directly - basically the key type and
the key description. We can add to that the description length.
This will be useful when turning a keyring into an associative array rather
than just a pointer block.
Signed-off-by: David Howells <dhowells@...hat.com>
---
include/linux/key.h | 21 ++++++++++---
security/keys/internal.h | 8 ++---
security/keys/key.c | 72 ++++++++++++++++++++++---------------------
security/keys/keyring.c | 37 +++++++++++-----------
security/keys/request_key.c | 12 +++++--
5 files changed, 83 insertions(+), 67 deletions(-)
diff --git a/include/linux/key.h b/include/linux/key.h
index 51bce29..d573e82 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -82,6 +82,12 @@ struct key_owner;
struct keyring_list;
struct keyring_name;
+struct keyring_index_key {
+ struct key_type *type;
+ const char *description;
+ size_t desc_len;
+};
+
/*****************************************************************************/
/*
* key reference with possession attribute handling
@@ -129,7 +135,6 @@ struct key {
struct list_head graveyard_link;
struct rb_node serial_node;
};
- struct key_type *type; /* type of key */
struct rw_semaphore sem; /* change vs change sem */
struct key_user *user; /* owner of this key */
void *security; /* security data for this key */
@@ -163,12 +168,18 @@ struct key {
#define KEY_FLAG_ROOT_CAN_CLEAR 6 /* set if key can be cleared by root without permission */
#define KEY_FLAG_INVALIDATED 7 /* set if key has been invalidated */
- /* the description string
- * - this is used to match a key against search criteria
- * - this should be a printable string
+ /* the key type and key description string
+ * - the desc is used to match a key against search criteria
+ * - it should be a printable string
* - eg: for krb5 AFS, this might be "afs@...HAT.COM"
*/
- char *description;
+ union {
+ struct keyring_index_key index_key;
+ struct {
+ struct key_type *type; /* type of key */
+ char *description;
+ };
+ };
/* type specific data
* - this is used by the keyring type to index the name
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 490aef5..77441dd 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -89,19 +89,17 @@ extern struct key_type *key_type_lookup(const char *type);
extern void key_type_put(struct key_type *ktype);
extern int __key_link_begin(struct key *keyring,
- const struct key_type *type,
- const char *description,
+ const struct keyring_index_key *index_key,
unsigned long *_prealloc);
extern int __key_link_check_live_key(struct key *keyring, struct key *key);
extern void __key_link(struct key *keyring, struct key *key,
unsigned long *_prealloc);
extern void __key_link_end(struct key *keyring,
- struct key_type *type,
+ const struct keyring_index_key *index_key,
unsigned long prealloc);
extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
- const struct key_type *type,
- const char *description,
+ const struct keyring_index_key *index_key,
key_perm_t perm);
extern struct key *keyring_search_instkey(struct key *keyring,
diff --git a/security/keys/key.c b/security/keys/key.c
index 8fb7c7b..7e6bc39 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -242,8 +242,8 @@ struct key *key_alloc(struct key_type *type, const char *desc,
}
}
- desclen = strlen(desc) + 1;
- quotalen = desclen + type->def_datalen;
+ desclen = strlen(desc);
+ quotalen = desclen + 1 + type->def_datalen;
/* get hold of the key tracking for this user */
user = key_user_lookup(uid);
@@ -277,7 +277,8 @@ struct key *key_alloc(struct key_type *type, const char *desc,
goto no_memory_2;
if (desc) {
- key->description = kmemdup(desc, desclen, GFP_KERNEL);
+ key->index_key.desc_len = desclen;
+ key->index_key.description = kmemdup(desc, desclen + 1, GFP_KERNEL);
if (!key->description)
goto no_memory_3;
}
@@ -285,7 +286,7 @@ struct key *key_alloc(struct key_type *type, const char *desc,
atomic_set(&key->usage, 1);
init_rwsem(&key->sem);
lockdep_set_class(&key->sem, &type->lock_class);
- key->type = type;
+ key->index_key.type = type;
key->user = user;
key->quotalen = quotalen;
key->datalen = type->def_datalen;
@@ -489,8 +490,7 @@ int key_instantiate_and_link(struct key *key,
}
if (keyring) {
- ret = __key_link_begin(keyring, key->type, key->description,
- &prealloc);
+ ret = __key_link_begin(keyring, &key->index_key, &prealloc);
if (ret < 0)
goto error_free_preparse;
}
@@ -499,7 +499,7 @@ int key_instantiate_and_link(struct key *key,
&prealloc);
if (keyring)
- __key_link_end(keyring, key->type, prealloc);
+ __key_link_end(keyring, &key->index_key, prealloc);
error_free_preparse:
if (key->type->preparse)
@@ -548,8 +548,7 @@ int key_reject_and_link(struct key *key,
ret = -EBUSY;
if (keyring)
- link_ret = __key_link_begin(keyring, key->type,
- key->description, &prealloc);
+ link_ret = __key_link_begin(keyring, &key->index_key, &prealloc);
mutex_lock(&key_construction_mutex);
@@ -581,7 +580,7 @@ int key_reject_and_link(struct key *key,
mutex_unlock(&key_construction_mutex);
if (keyring)
- __key_link_end(keyring, key->type, prealloc);
+ __key_link_end(keyring, &key->index_key, prealloc);
/* wake up anyone waiting for a key to be constructed */
if (awaken)
@@ -780,25 +779,27 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
key_perm_t perm,
unsigned long flags)
{
- unsigned long prealloc;
+ struct keyring_index_key index_key = {
+ .description = description,
+ };
struct key_preparsed_payload prep;
const struct cred *cred = current_cred();
- struct key_type *ktype;
+ unsigned long prealloc;
struct key *keyring, *key = NULL;
key_ref_t key_ref;
int ret;
/* look up the key type to see if it's one of the registered kernel
* types */
- ktype = key_type_lookup(type);
- if (IS_ERR(ktype)) {
+ index_key.type = key_type_lookup(type);
+ if (IS_ERR(index_key.type)) {
key_ref = ERR_PTR(-ENODEV);
goto error;
}
key_ref = ERR_PTR(-EINVAL);
- if (!ktype->match || !ktype->instantiate ||
- (!description && !ktype->preparse))
+ if (!index_key.type->match || !index_key.type->instantiate ||
+ (!index_key.description && !index_key.type->preparse))
goto error_put_type;
keyring = key_ref_to_ptr(keyring_ref);
@@ -812,21 +813,22 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
memset(&prep, 0, sizeof(prep));
prep.data = payload;
prep.datalen = plen;
- prep.quotalen = ktype->def_datalen;
- if (ktype->preparse) {
- ret = ktype->preparse(&prep);
+ prep.quotalen = index_key.type->def_datalen;
+ if (index_key.type->preparse) {
+ ret = index_key.type->preparse(&prep);
if (ret < 0) {
key_ref = ERR_PTR(ret);
goto error_put_type;
}
- if (!description)
- description = prep.description;
+ if (!index_key.description)
+ index_key.description = prep.description;
key_ref = ERR_PTR(-EINVAL);
- if (!description)
+ if (!index_key.description)
goto error_free_prep;
}
+ index_key.desc_len = strlen(index_key.description);
- ret = __key_link_begin(keyring, ktype, description, &prealloc);
+ ret = __key_link_begin(keyring, &index_key, &prealloc);
if (ret < 0) {
key_ref = ERR_PTR(ret);
goto error_free_prep;
@@ -844,9 +846,8 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
* key of the same type and description in the destination keyring and
* update that instead if possible
*/
- if (ktype->update) {
- key_ref = __keyring_search_one(keyring_ref, ktype, description,
- 0);
+ if (index_key.type->update) {
+ key_ref = __keyring_search_one(keyring_ref, &index_key, 0);
if (!IS_ERR(key_ref))
goto found_matching_key;
}
@@ -856,16 +857,17 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
perm |= KEY_USR_VIEW;
- if (ktype->read)
+ if (index_key.type->read)
perm |= KEY_POS_READ;
- if (ktype == &key_type_keyring || ktype->update)
+ if (index_key.type == &key_type_keyring ||
+ index_key.type->update)
perm |= KEY_POS_WRITE;
}
/* allocate a new key */
- key = key_alloc(ktype, description, cred->fsuid, cred->fsgid, cred,
- perm, flags);
+ key = key_alloc(index_key.type, index_key.description,
+ cred->fsuid, cred->fsgid, cred, perm, flags);
if (IS_ERR(key)) {
key_ref = ERR_CAST(key);
goto error_link_end;
@@ -882,12 +884,12 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
key_ref = make_key_ref(key, is_key_possessed(keyring_ref));
error_link_end:
- __key_link_end(keyring, ktype, prealloc);
+ __key_link_end(keyring, &index_key, prealloc);
error_free_prep:
- if (ktype->preparse)
- ktype->free_preparse(&prep);
+ if (index_key.type->preparse)
+ index_key.type->free_preparse(&prep);
error_put_type:
- key_type_put(ktype);
+ key_type_put(index_key.type);
error:
return key_ref;
@@ -895,7 +897,7 @@ error:
/* we found a matching key, so we're going to try to update it
* - we can drop the locks first as we have the key pinned
*/
- __key_link_end(keyring, ktype, prealloc);
+ __key_link_end(keyring, &index_key, prealloc);
key_ref = __key_update(key_ref, &prep);
goto error_free_prep;
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index f784063..c7f59f9 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -538,8 +538,7 @@ EXPORT_SYMBOL(keyring_search);
* to the returned key reference.
*/
key_ref_t __keyring_search_one(key_ref_t keyring_ref,
- const struct key_type *ktype,
- const char *description,
+ const struct keyring_index_key *index_key,
key_perm_t perm)
{
struct keyring_list *klist;
@@ -558,9 +557,9 @@ key_ref_t __keyring_search_one(key_ref_t keyring_ref,
smp_rmb();
for (loop = 0; loop < nkeys ; loop++) {
key = rcu_dereference(klist->keys[loop]);
- if (key->type == ktype &&
+ if (key->type == index_key->type &&
(!key->type->match ||
- key->type->match(key, description)) &&
+ key->type->match(key, index_key->description)) &&
key_permission(make_key_ref(key, possessed),
perm) == 0 &&
!(key->flags & ((1 << KEY_FLAG_INVALIDATED) |
@@ -747,8 +746,8 @@ static void keyring_unlink_rcu_disposal(struct rcu_head *rcu)
/*
* Preallocate memory so that a key can be linked into to a keyring.
*/
-int __key_link_begin(struct key *keyring, const struct key_type *type,
- const char *description, unsigned long *_prealloc)
+int __key_link_begin(struct key *keyring, const struct keyring_index_key *index_key,
+ unsigned long *_prealloc)
__acquires(&keyring->sem)
__acquires(&keyring_serialise_link_sem)
{
@@ -759,7 +758,8 @@ int __key_link_begin(struct key *keyring, const struct key_type *type,
size_t size;
int loop, lru, ret;
- kenter("%d,%s,%s,", key_serial(keyring), type->name, description);
+ kenter("%d,%s,%s,",
+ key_serial(keyring), index_key->type->name, index_key->description);
if (keyring->type != &key_type_keyring)
return -ENOTDIR;
@@ -772,7 +772,7 @@ int __key_link_begin(struct key *keyring, const struct key_type *type,
/* serialise link/link calls to prevent parallel calls causing a cycle
* when linking two keyring in opposite orders */
- if (type == &key_type_keyring)
+ if (index_key->type == &key_type_keyring)
down_write(&keyring_serialise_link_sem);
klist = rcu_dereference_locked_keyring(keyring);
@@ -784,8 +784,8 @@ int __key_link_begin(struct key *keyring, const struct key_type *type,
for (loop = klist->nkeys - 1; loop >= 0; loop--) {
struct key *key = rcu_deref_link_locked(klist, loop,
keyring);
- if (key->type == type &&
- strcmp(key->description, description) == 0) {
+ if (key->type == index_key->type &&
+ strcmp(key->description, index_key->description) == 0) {
/* Found a match - we'll replace the link with
* one to the new key. We record the slot
* position.
@@ -865,7 +865,7 @@ error_quota:
key_payload_reserve(keyring,
keyring->datalen - KEYQUOTA_LINK_BYTES);
error_sem:
- if (type == &key_type_keyring)
+ if (index_key->type == &key_type_keyring)
up_write(&keyring_serialise_link_sem);
error_krsem:
up_write(&keyring->sem);
@@ -957,16 +957,17 @@ void __key_link(struct key *keyring, struct key *key,
*
* Must be called with __key_link_begin() having being called.
*/
-void __key_link_end(struct key *keyring, struct key_type *type,
+void __key_link_end(struct key *keyring,
+ const struct keyring_index_key *index_key,
unsigned long prealloc)
__releases(&keyring->sem)
__releases(&keyring_serialise_link_sem)
{
- BUG_ON(type == NULL);
- BUG_ON(type->name == NULL);
- kenter("%d,%s,%lx", keyring->serial, type->name, prealloc);
+ BUG_ON(index_key->type == NULL);
+ BUG_ON(index_key->type->name == NULL);
+ kenter("%d,%s,%lx", keyring->serial, index_key->type->name, prealloc);
- if (type == &key_type_keyring)
+ if (index_key->type == &key_type_keyring)
up_write(&keyring_serialise_link_sem);
if (prealloc) {
@@ -1007,12 +1008,12 @@ int key_link(struct key *keyring, struct key *key)
key_check(keyring);
key_check(key);
- ret = __key_link_begin(keyring, key->type, key->description, &prealloc);
+ ret = __key_link_begin(keyring, &key->index_key, &prealloc);
if (ret == 0) {
ret = __key_link_check_live_key(keyring, key);
if (ret == 0)
__key_link(keyring, key, &prealloc);
- __key_link_end(keyring, key->type, prealloc);
+ __key_link_end(keyring, &key->index_key, prealloc);
}
return ret;
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 172115b..586cb79 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -352,6 +352,11 @@ static int construct_alloc_key(struct key_type *type,
struct key_user *user,
struct key **_key)
{
+ const struct keyring_index_key index_key = {
+ .type = type,
+ .description = description,
+ .desc_len = strlen(description),
+ };
const struct cred *cred = current_cred();
unsigned long prealloc;
struct key *key;
@@ -379,8 +384,7 @@ static int construct_alloc_key(struct key_type *type,
set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags);
if (dest_keyring) {
- ret = __key_link_begin(dest_keyring, type, description,
- &prealloc);
+ ret = __key_link_begin(dest_keyring, &index_key, &prealloc);
if (ret < 0)
goto link_prealloc_failed;
}
@@ -400,7 +404,7 @@ static int construct_alloc_key(struct key_type *type,
mutex_unlock(&key_construction_mutex);
if (dest_keyring)
- __key_link_end(dest_keyring, type, prealloc);
+ __key_link_end(dest_keyring, &index_key, prealloc);
mutex_unlock(&user->cons_lock);
*_key = key;
kleave(" = 0 [%d]", key_serial(key));
@@ -416,7 +420,7 @@ key_already_present:
ret = __key_link_check_live_key(dest_keyring, key);
if (ret == 0)
__key_link(dest_keyring, key, &prealloc);
- __key_link_end(dest_keyring, type, prealloc);
+ __key_link_end(dest_keyring, &index_key, prealloc);
if (ret < 0)
goto link_check_failed;
}
--
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