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KEYS: Move the flags representing required permission to linux/key.h 

Move the flags representing required permission to linux/key.h as the perm
parameter of security_key_permission() is in terms of them - and not the
permissions mask flags used in key->perm.

Whilst we're at it:

 (1) Rename them to be KEY_NEED_xxx rather than KEY_xxx to avoid collisions
     with symbols in uapi/linux/input.h.

 (2) Don't use key_perm_t for a mask of required permissions, but rather limit
     it to the permissions mask attached to the key and arguments related
     directly to that.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
This commit is contained in:
David Howells 2014-03-14 17:44:49 +00:00
parent c60f7d5a8e
commit f5895943d9
13 changed files with 53 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/key.h
View File

@ -309,6 +309,17 @@ static inline key_serial_t key_serial(const struct key *key)
extern void key_set_timeout(struct key *, unsigned);
/*
* The permissions required on a key that we're looking up.
*/
#define KEY_NEED_VIEW 0x01 /* Require permission to view attributes */
#define KEY_NEED_READ 0x02 /* Require permission to read content */
#define KEY_NEED_WRITE 0x04 /* Require permission to update / modify */
#define KEY_NEED_SEARCH 0x08 /* Require permission to search (keyring) or find (key) */
#define KEY_NEED_LINK 0x10 /* Require permission to link */
#define KEY_NEED_SETATTR 0x20 /* Require permission to change attributes */
#define KEY_NEED_ALL 0x3f /* All the above permissions */
/**
* key_is_instantiated - Determine if a key has been positively instantiated
* @key: The key to check.

6
include/linux/security.h
View File

@ -1707,7 +1707,7 @@ struct security_operations {
void (*key_free) (struct key *key);
int (*key_permission) (key_ref_t key_ref,
const struct cred *cred,
key_perm_t perm);
unsigned perm);
int (*key_getsecurity)(struct key *key, char **_buffer);
#endif /* CONFIG_KEYS */
@ -3026,7 +3026,7 @@ static inline int security_path_chroot(struct path *path)
int security_key_alloc(struct key *key, const struct cred *cred, unsigned long flags);
void security_key_free(struct key *key);
int security_key_permission(key_ref_t key_ref,
const struct cred *cred, key_perm_t perm);
const struct cred *cred, unsigned perm);
int security_key_getsecurity(struct key *key, char **_buffer);
#else
@ -3044,7 +3044,7 @@ static inline void security_key_free(struct key *key)
static inline int security_key_permission(key_ref_t key_ref,
const struct cred *cred,
key_perm_t perm)
unsigned perm)
{
return 0;
}

2
security/capability.c
View File

@ -878,7 +878,7 @@ static void cap_key_free(struct key *key)
}
static int cap_key_permission(key_ref_t key_ref, const struct cred *cred,
key_perm_t perm)
unsigned perm)
{
return 0;
}

11
security/keys/internal.h
View File

@ -176,20 +176,11 @@ extern int key_task_permission(const key_ref_t key_ref,
/*
* Check to see whether permission is granted to use a key in the desired way.
*/
static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
static inline int key_permission(const key_ref_t key_ref, unsigned perm)
{
return key_task_permission(key_ref, current_cred(), perm);
}
/* required permissions */
#define KEY_VIEW 0x01 /* require permission to view attributes */
#define KEY_READ 0x02 /* require permission to read content */
#define KEY_WRITE 0x04 /* require permission to update / modify */
#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
#define KEY_LINK 0x10 /* require permission to link */
#define KEY_SETATTR 0x20 /* require permission to change attributes */
#define KEY_ALL 0x3f /* all the above permissions */
/*
* Authorisation record for request_key().
*/

6
security/keys/key.c
View File

@ -714,7 +714,7 @@ static inline key_ref_t __key_update(key_ref_t key_ref,
int ret;
/* need write permission on the key to update it */
ret = key_permission(key_ref, KEY_WRITE);
ret = key_permission(key_ref, KEY_NEED_WRITE);
if (ret < 0)
goto error;
@ -838,7 +838,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
/* if we're going to allocate a new key, we're going to have
* to modify the keyring */
ret = key_permission(keyring_ref, KEY_WRITE);
ret = key_permission(keyring_ref, KEY_NEED_WRITE);
if (ret < 0) {
key_ref = ERR_PTR(ret);
goto error_link_end;
@ -928,7 +928,7 @@ int key_update(key_ref_t key_ref, const void *payload, size_t plen)
key_check(key);
/* the key must be writable */
ret = key_permission(key_ref, KEY_WRITE);
ret = key_permission(key_ref, KEY_NEED_WRITE);
if (ret < 0)
goto error;

44
security/keys/keyctl.c
View File

@ -111,7 +111,7 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
}
/* find the target keyring (which must be writable) */
keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error3;
@ -195,7 +195,7 @@ SYSCALL_DEFINE4(request_key, const char __user *, _type,
dest_ref = NULL;
if (destringid) {
dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE,
KEY_WRITE);
KEY_NEED_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@ -253,7 +253,7 @@ long keyctl_get_keyring_ID(key_serial_t id, int create)
long ret;
lflags = create ? KEY_LOOKUP_CREATE : 0;
key_ref = lookup_user_key(id, lflags, KEY_SEARCH);
key_ref = lookup_user_key(id, lflags, KEY_NEED_SEARCH);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@ -334,7 +334,7 @@ long keyctl_update_key(key_serial_t id,
}
/* find the target key (which must be writable) */
key_ref = lookup_user_key(id, 0, KEY_WRITE);
key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@ -365,12 +365,12 @@ long keyctl_revoke_key(key_serial_t id)
key_ref_t key_ref;
long ret;
key_ref = lookup_user_key(id, 0, KEY_WRITE);
key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
if (ret != -EACCES)
goto error;
key_ref = lookup_user_key(id, 0, KEY_SETATTR);
key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@ -401,7 +401,7 @@ long keyctl_invalidate_key(key_serial_t id)
kenter("%d", id);
key_ref = lookup_user_key(id, 0, KEY_SEARCH);
key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@ -428,7 +428,7 @@ long keyctl_keyring_clear(key_serial_t ringid)
key_ref_t keyring_ref;
long ret;
keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
@ -470,13 +470,13 @@ long keyctl_keyring_link(key_serial_t id, key_serial_t ringid)
key_ref_t keyring_ref, key_ref;
long ret;
keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
}
key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK);
key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@ -505,7 +505,7 @@ long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
key_ref_t keyring_ref, key_ref;
long ret;
keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE);
keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
@ -548,7 +548,7 @@ long keyctl_describe_key(key_serial_t keyid,
char *tmpbuf;
long ret;
key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW);
key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW);
if (IS_ERR(key_ref)) {
/* viewing a key under construction is permitted if we have the
* authorisation token handy */
@ -639,7 +639,7 @@ long keyctl_keyring_search(key_serial_t ringid,
}
/* get the keyring at which to begin the search */
keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH);
keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error2;
@ -649,7 +649,7 @@ long keyctl_keyring_search(key_serial_t ringid,
dest_ref = NULL;
if (destringid) {
dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE,
KEY_WRITE);
KEY_NEED_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@ -676,7 +676,7 @@ long keyctl_keyring_search(key_serial_t ringid,
/* link the resulting key to the destination keyring if we can */
if (dest_ref) {
ret = key_permission(key_ref, KEY_LINK);
ret = key_permission(key_ref, KEY_NEED_LINK);
if (ret < 0)
goto error6;
@ -727,7 +727,7 @@ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
key = key_ref_to_ptr(key_ref);
/* see if we can read it directly */
ret = key_permission(key_ref, KEY_READ);
ret = key_permission(key_ref, KEY_NEED_READ);
if (ret == 0)
goto can_read_key;
if (ret != -EACCES)
@ -799,7 +799,7 @@ long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group)
goto error;
key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
KEY_SETATTR);
KEY_NEED_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@ -905,7 +905,7 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
goto error;
key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
KEY_SETATTR);
KEY_NEED_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@ -947,7 +947,7 @@ static long get_instantiation_keyring(key_serial_t ringid,
/* if a specific keyring is nominated by ID, then use that */
if (ringid > 0) {
dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE);
dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
if (IS_ERR(dkref))
return PTR_ERR(dkref);
*_dest_keyring = key_ref_to_ptr(dkref);
@ -1315,7 +1315,7 @@ long keyctl_set_timeout(key_serial_t id, unsigned timeout)
long ret;
key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
KEY_SETATTR);
KEY_NEED_SETATTR);
if (IS_ERR(key_ref)) {
/* setting the timeout on a key under construction is permitted
* if we have the authorisation token handy */
@ -1418,7 +1418,7 @@ long keyctl_get_security(key_serial_t keyid,
char *context;
long ret;
key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW);
key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW);
if (IS_ERR(key_ref)) {
if (PTR_ERR(key_ref) != -EACCES)
return PTR_ERR(key_ref);
@ -1482,7 +1482,7 @@ long keyctl_session_to_parent(void)
struct cred *cred;
int ret;
keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK);
keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK);
if (IS_ERR(keyring_r))
return PTR_ERR(keyring_r);

8
security/keys/keyring.c
View File

@ -541,7 +541,7 @@ static int keyring_search_iterator(const void *object, void *iterator_data)
/* key must have search permissions */
if (!(ctx->flags & KEYRING_SEARCH_NO_CHECK_PERM) &&
key_task_permission(make_key_ref(key, ctx->possessed),
ctx->cred, KEY_SEARCH) < 0) {
ctx->cred, KEY_NEED_SEARCH) < 0) {
ctx->result = ERR_PTR(-EACCES);
kleave(" = %d [!perm]", ctx->skipped_ret);
goto skipped;
@ -721,7 +721,7 @@ static bool search_nested_keyrings(struct key *keyring,
/* Search a nested keyring */
if (!(ctx->flags & KEYRING_SEARCH_NO_CHECK_PERM) &&
key_task_permission(make_key_ref(key, ctx->possessed),
ctx->cred, KEY_SEARCH) < 0)
ctx->cred, KEY_NEED_SEARCH) < 0)
continue;
/* stack the current position */
@ -843,7 +843,7 @@ key_ref_t keyring_search_aux(key_ref_t keyring_ref,
return ERR_PTR(-ENOTDIR);
if (!(ctx->flags & KEYRING_SEARCH_NO_CHECK_PERM)) {
err = key_task_permission(keyring_ref, ctx->cred, KEY_SEARCH);
err = key_task_permission(keyring_ref, ctx->cred, KEY_NEED_SEARCH);
if (err < 0)
return ERR_PTR(err);
}
@ -973,7 +973,7 @@ struct key *find_keyring_by_name(const char *name, bool skip_perm_check)
if (!skip_perm_check &&
key_permission(make_key_ref(keyring, 0),
KEY_SEARCH) < 0)
KEY_NEED_SEARCH) < 0)
continue;
/* we've got a match but we might end up racing with

4
security/keys/permission.c
View File

@ -28,7 +28,7 @@
* permissions bits or the LSM check.
*/
int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
key_perm_t perm)
unsigned perm)
{
struct key *key;
key_perm_t kperm;
@ -68,7 +68,7 @@ int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
if (is_key_possessed(key_ref))
kperm |= key->perm >> 24;
kperm = kperm & perm & KEY_ALL;
kperm = kperm & perm & KEY_NEED_ALL;
if (kperm != perm)
return -EACCES;

4
security/keys/persistent.c
View File

@ -108,7 +108,7 @@ static long key_get_persistent(struct user_namespace *ns, kuid_t uid,
return PTR_ERR(persistent_ref);
found:
ret = key_task_permission(persistent_ref, current_cred(), KEY_LINK);
ret = key_task_permission(persistent_ref, current_cred(), KEY_NEED_LINK);
if (ret == 0) {
persistent = key_ref_to_ptr(persistent_ref);
ret = key_link(key_ref_to_ptr(dest_ref), persistent);
@ -151,7 +151,7 @@ long keyctl_get_persistent(uid_t _uid, key_serial_t destid)
}
/* There must be a destination keyring */
dest_ref = lookup_user_key(destid, KEY_LOOKUP_CREATE, KEY_WRITE);
dest_ref = lookup_user_key(destid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
if (IS_ERR(dest_ref))
return PTR_ERR(dest_ref);
if (key_ref_to_ptr(dest_ref)->type != &key_type_keyring) {

2
security/keys/proc.c
View File

@ -218,7 +218,7 @@ static int proc_keys_show(struct seq_file *m, void *v)
* - the caller holds a spinlock, and thus the RCU read lock, making our
* access to __current_cred() safe
*/
rc = key_task_permission(key_ref, ctx.cred, KEY_VIEW);
rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW);
if (rc < 0)
return 0;

2
security/security.c
View File

@ -1405,7 +1405,7 @@ void security_key_free(struct key *key)
}
int security_key_permission(key_ref_t key_ref,
const struct cred *cred, key_perm_t perm)
const struct cred *cred, unsigned perm)
{
return security_ops->key_permission(key_ref, cred, perm);
}

2
security/selinux/hooks.c
View File

@ -5704,7 +5704,7 @@ static void selinux_key_free(struct key *k)
static int selinux_key_permission(key_ref_t key_ref,
const struct cred *cred,
key_perm_t perm)
unsigned perm)
{
struct key *key;
struct key_security_struct *ksec;

2
security/smack/smack_lsm.c
View File

@ -3506,7 +3506,7 @@ static void smack_key_free(struct key *key)
* an error code otherwise
*/
static int smack_key_permission(key_ref_t key_ref,
const struct cred *cred, key_perm_t perm)
const struct cred *cred, unsigned perm)
{
struct key *keyp;
struct smk_audit_info ad;