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SubjectRe: [RFC PATCH 22/27] KEYS: Replace uid/gid/perm permissions checking with an ACL
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On 2/15/19 11:11 AM, David Howells wrote:
> Replace the uid/gid/perm permissions checking on a key with an ACL to allow
> the SETATTR and SEARCH permissions to be split. This will also allow a
> greater range of subjects to represented.
>
> ============
> WHY DO THIS?
> ============
>
> The problem is that SETATTR and SEARCH cover a slew of actions, not all of
> which should be grouped together.
>
> For SETATTR, this includes actions that are about controlling access to a
> key:
>
> (1) Changing a key's ownership.
>
> (2) Changing a key's security information.
>
> (3) Setting a keyring's restriction.
>
> And actions that are about managing a key's lifetime:
>
> (4) Setting an expiry time.
>
> (5) Revoking a key.
>
> and (proposed) managing a key as part of a cache:
>
> (6) Invalidating a key.
>
> Managing a key's lifetime doesn't really have anything to do with
> controlling access to that key.
>
> Expiry time is awkward since it's more about the lifetime of the content
> and so, in some ways goes better with WRITE permission. It can, however,
> be set unconditionally by a process with an appropriate authorisation token
> for instantiating a key, and can also be set by the key type driver when a
> key is instantiated, so lumping it with the access-controlling actions is
> probably okay.
>
> As for SEARCH permission, that currently covers:
>
> (1) Finding keys in a keyring tree during a search.
>
> (2) Permitting keyrings to be joined.
>
> (3) Invalidation.
>
> But these don't really belong together either, since these actions really
> need to be controlled separately.
>
> Finally, there are number of special cases to do with granting the
> administrator special rights to invalidate or clear keys that I would like
> to handle with the ACL rather than key flags and special checks.
>
>
> ===============
> WHAT IS CHANGED
> ===============
>
> The SETATTR permission is split to create two new permissions:
>
> (1) SET_SECURITY - which allows the key's owner, group and ACL to be
> changed and a restriction to be placed on a keyring.
>
> (2) REVOKE - which allows a key to be revoked.
>
> The SEARCH permission is split to create:
>
> (1) SEARCH - which allows a keyring to be search and a key to be found.
>
> (2) JOIN - which allows a keyring to be joined as a session keyring.
>
> (3) INVAL - which allows a key to be invalidated.
>
> The WRITE permission is also split to create:
>
> (1) WRITE - which allows a key's content to be altered and links to be
> added, removed and replaced in a keyring.
>
> (2) CLEAR - which allows a keyring to be cleared completely. This is
> split out to make it possible to give just this to an administrator.
>
> (3) REVOKE - see above.
>
>
> Keys acquire ACLs which consist of a series of ACEs, and all that apply are
> unioned together. An ACE specifies a subject, such as:
>
> (*) Possessor - permitted to anyone who 'possesses' a key
> (*) Owner - permitted to the key owner
> (*) Group - permitted to the key group
> (*) Everyone - permitted to everyone
>
> Note that 'Other' has been replaced with 'Everyone' on the assumption that
> you wouldn't grant a permit to 'Other' that you wouldn't also grant to
> everyone else.
>
> Further subjects may be made available by later patches.
>
> The ACE also specifies a permissions mask. The set of permissions is now:
>
> VIEW Can view the key metadata
> READ Can read the key content
> WRITE Can update/modify the key content
> SEARCH Can find the key by searching/requesting
> LINK Can make a link to the key
> SET_SECURITY Can change owner, ACL, expiry
> INVAL Can invalidate
> REVOKE Can revoke
> JOIN Can join this keyring
> CLEAR Can clear this keyring
>
>
> The KEYCTL_SETPERM function is then deprecated.
>
> The KEYCTL_SET_TIMEOUT function then is permitted if SET_SECURITY is set,
> or if the caller has a valid instantiation auth token.
>
> The KEYCTL_INVALIDATE function then requires INVAL.
>
> The KEYCTL_REVOKE function then requires REVOKE.
>
> The KEYCTL_JOIN_SESSION_KEYRING function then requires JOIN to join an
> existing keyring.
>
> The JOIN permission is enabled by default for session keyrings and manually
> created keyrings only.
>
>
> ======================
> BACKWARD COMPATIBILITY
> ======================
>
> To maintain backward compatibility, KEYCTL_SETPERM will translate the
> permissions mask it is given into a new ACL for a key - unless
> KEYCTL_SET_ACL has been called on that key, in which case an error will be
> returned.
>
> It will convert possessor, owner, group and other permissions into separate
> ACEs, if each portion of the mask is non-zero.
>
> SETATTR permission turns on all of INVAL, REVOKE and SET_SECURITY. WRITE
> permission turns on WRITE, REVOKE and, if a keyring, CLEAR. JOIN is turned
> on if a keyring is being altered.
>
> The KEYCTL_DESCRIBE function translates the ACL back into a permissions
> mask to return depending on possessor, owner, group and everyone ACEs.
>
> It will make the following mappings:
>
> (1) INVAL, JOIN -> SEARCH
>
> (2) SET_SECURITY -> SETATTR
>
> (3) REVOKE -> WRITE if SETATTR isn't already set
>
> (4) CLEAR -> WRITE
>
> Note that the value subsequently returned by KEYCTL_DESCRIBE may not match
> the value set with KEYCTL_SETATTR.
>
>
> =======
> TESTING
> =======
>
> This passes the keyutils testsuite for all but a couple of tests:
>
> (1) tests/keyctl/dh_compute/badargs: The first wrong-key-type test now
> returns EOPNOTSUPP rather than ENOKEY as READ permission isn't removed
> if the type doesn't have ->read(). You still can't actually read the
> key.
>
> (2) tests/keyctl/permitting/valid: The view-other-permissions test doesn't
> work as Other has been replaced with Everyone in the ACL.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> ---
>
> certs/blacklist.c | 7 -
> certs/system_keyring.c | 12 -
> drivers/md/dm-crypt.c | 2
> drivers/nvdimm/security.c | 2
> fs/afs/security.c | 2
> fs/cifs/cifs_spnego.c | 25 ++
> fs/cifs/cifsacl.c | 28 ++
> fs/cifs/connect.c | 4
> fs/crypto/keyinfo.c | 2
> fs/ecryptfs/ecryptfs_kernel.h | 2
> fs/ecryptfs/keystore.c | 2
> fs/fscache/object-list.c | 2
> fs/nfs/nfs4idmap.c | 29 ++
> fs/ubifs/auth.c | 2
> include/linux/key.h | 113 +++++----
> include/uapi/linux/keyctl.h | 63 +++++
> lib/digsig.c | 2
> net/ceph/ceph_common.c | 2
> net/dns_resolver/dns_key.c | 12 +
> net/dns_resolver/dns_query.c | 15 +
> net/rxrpc/key.c | 16 +
> security/integrity/digsig.c | 31 +--
> security/integrity/digsig_asymmetric.c | 2
> security/integrity/evm/evm_crypto.c | 2
> security/integrity/ima/ima_mok.c | 13 +
> security/integrity/integrity.h | 4
> .../integrity/platform_certs/platform_keyring.c | 13 +
> security/keys/encrypted-keys/encrypted.c | 2
> security/keys/encrypted-keys/masterkey_trusted.c | 2
> security/keys/gc.c | 2
> security/keys/internal.h | 12 +
> security/keys/key.c | 29 +-
> security/keys/keyctl.c | 93 +++++---
> security/keys/keyring.c | 27 ++
> security/keys/permission.c | 238 +++++++++++++++++---
> security/keys/persistent.c | 27 ++
> security/keys/proc.c | 17 +
> security/keys/process_keys.c | 72 +++++-
> security/keys/request_key.c | 40 ++-
> security/keys/request_key_auth.c | 15 +
> security/selinux/hooks.c | 16 +
> security/smack/smack_lsm.c | 3
> 42 files changed, 726 insertions(+), 278 deletions(-)
>
> diff --git a/certs/blacklist.c b/certs/blacklist.c
> index 3a507b9e2568..7677c3b0a147 100644
> --- a/certs/blacklist.c
> +++ b/certs/blacklist.c
> @@ -93,8 +93,7 @@ int mark_hash_blacklisted(const char *hash)
> hash,
> NULL,
> 0,
> - ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW),
> + &internal_key_acl,
> KEY_ALLOC_NOT_IN_QUOTA |
> KEY_ALLOC_BUILT_IN);
> if (IS_ERR(key)) {
> @@ -153,9 +152,7 @@ static int __init blacklist_init(void)
> keyring_alloc(".blacklist",
> KUIDT_INIT(0), KGIDT_INIT(0),
> current_cred(),
> - (KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ |
> - KEY_USR_SEARCH,
> + &internal_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA |
> KEY_FLAG_KEEP,
> NULL, NULL);
> diff --git a/certs/system_keyring.c b/certs/system_keyring.c
> index 81728717523d..7b775d6028e1 100644
> --- a/certs/system_keyring.c
> +++ b/certs/system_keyring.c
> @@ -100,9 +100,7 @@ static __init int system_trusted_keyring_init(void)
> builtin_trusted_keys =
> keyring_alloc(".builtin_trusted_keys",
> KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
> - ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
> - KEY_ALLOC_NOT_IN_QUOTA,
> + &internal_key_acl, KEY_ALLOC_NOT_IN_QUOTA,
> NULL, NULL);
> if (IS_ERR(builtin_trusted_keys))
> panic("Can't allocate builtin trusted keyring\n");
> @@ -111,10 +109,7 @@ static __init int system_trusted_keyring_init(void)
> secondary_trusted_keys =
> keyring_alloc(".secondary_trusted_keys",
> KUIDT_INIT(0), KGIDT_INIT(0), 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,
> + &internal_writable_keyring_acl, KEY_ALLOC_NOT_IN_QUOTA,
> get_builtin_and_secondary_restriction(),
> NULL);
> if (IS_ERR(secondary_trusted_keys))
> @@ -164,8 +159,7 @@ static __init int load_system_certificate_list(void)
> NULL,
> p,
> plen,
> - ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ),
> + &internal_key_acl,
> KEY_ALLOC_NOT_IN_QUOTA |
> KEY_ALLOC_BUILT_IN |
> KEY_ALLOC_BYPASS_RESTRICTION);
> diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
> index 0ff22159a0ca..7f37616cd21a 100644
> --- a/drivers/md/dm-crypt.c
> +++ b/drivers/md/dm-crypt.c
> @@ -2034,7 +2034,7 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string
> return -ENOMEM;
>
> key = request_key(key_string[0] == 'l' ? &key_type_logon : &key_type_user,
> - key_desc + 1, NULL);
> + key_desc + 1, NULL, NULL);
> if (IS_ERR(key)) {
> kzfree(new_key_string);
> return PTR_ERR(key);
> diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c
> index f8bb746a549f..db5cfd934ec8 100644
> --- a/drivers/nvdimm/security.c
> +++ b/drivers/nvdimm/security.c
> @@ -53,7 +53,7 @@ static struct key *nvdimm_request_key(struct nvdimm *nvdimm)
> struct device *dev = &nvdimm->dev;
>
> sprintf(desc, "%s%s", NVDIMM_PREFIX, nvdimm->dimm_id);
> - key = request_key(&key_type_encrypted, desc, "");
> + key = request_key(&key_type_encrypted, desc, "", NULL);
> if (IS_ERR(key)) {
> if (PTR_ERR(key) == -ENOKEY)
> dev_dbg(dev, "request_key() found no key\n");
> diff --git a/fs/afs/security.c b/fs/afs/security.c
> index 5f58a9a17e69..184274ce41e1 100644
> --- a/fs/afs/security.c
> +++ b/fs/afs/security.c
> @@ -32,7 +32,7 @@ struct key *afs_request_key(struct afs_cell *cell)
>
> _debug("key %s", cell->anonymous_key->description);
> key = request_key(&key_type_rxrpc, cell->anonymous_key->description,
> - NULL);
> + NULL, NULL);
> if (IS_ERR(key)) {
> if (PTR_ERR(key) != -ENOKEY) {
> _leave(" = %ld", PTR_ERR(key));
> diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
> index 7f01c6e60791..d1b439ad0f1a 100644
> --- a/fs/cifs/cifs_spnego.c
> +++ b/fs/cifs/cifs_spnego.c
> @@ -32,6 +32,25 @@
> #include "cifsproto.h"
> static const struct cred *spnego_cred;
>
> +static struct key_acl cifs_spnego_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_SEARCH | KEY_ACE_READ),
> + KEY_OWNER_ACE(KEY_ACE_VIEW),
> + }
> +};
> +
> +static struct key_acl cifs_spnego_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_CLEAR),
> + }
> +};
> +
> /* create a new cifs key */
> static int
> cifs_spnego_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
> @@ -170,7 +189,8 @@ cifs_get_spnego_key(struct cifs_ses *sesInfo)
>
> cifs_dbg(FYI, "key description = %s\n", description);
> saved_cred = override_creds(spnego_cred);
> - spnego_key = request_key(&cifs_spnego_key_type, description, "");
> + spnego_key = request_key(&cifs_spnego_key_type, description, "",
> + &cifs_spnego_key_acl);
> revert_creds(saved_cred);
>
> #ifdef CONFIG_CIFS_DEBUG2
> @@ -207,8 +227,7 @@ init_cifs_spnego(void)
>
> keyring = keyring_alloc(".cifs_spnego",
> GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
> - (KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ,
> + &cifs_spnego_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
> if (IS_ERR(keyring)) {
> ret = PTR_ERR(keyring);
> diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
> index 1d377b7f2860..78eed72f3af0 100644
> --- a/fs/cifs/cifsacl.c
> +++ b/fs/cifs/cifsacl.c
> @@ -33,6 +33,25 @@
> #include "cifsproto.h"
> #include "cifs_debug.h"
>
> +static struct key_acl cifs_idmap_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_SEARCH | KEY_ACE_READ),
> + KEY_OWNER_ACE(KEY_ACE_VIEW),
> + }
> +};
> +
> +static struct key_acl cifs_idmap_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ),
> + }
> +};
> +
> /* security id for everyone/world system group */
> static const struct cifs_sid sid_everyone = {
> 1, 1, {0, 0, 0, 0, 0, 1}, {0} };
> @@ -298,7 +317,8 @@ id_to_sid(unsigned int cid, uint sidtype, struct cifs_sid *ssid)
>
> rc = 0;
> saved_cred = override_creds(root_cred);
> - sidkey = request_key(&cifs_idmap_key_type, desc, "");
> + sidkey = request_key(&cifs_idmap_key_type, desc, "",
> + &cifs_idmap_key_acl);
> if (IS_ERR(sidkey)) {
> rc = -EINVAL;
> cifs_dbg(FYI, "%s: Can't map %cid %u to a SID\n",
> @@ -403,7 +423,8 @@ sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid,
> return -ENOMEM;
>
> saved_cred = override_creds(root_cred);
> - sidkey = request_key(&cifs_idmap_key_type, sidstr, "");
> + sidkey = request_key(&cifs_idmap_key_type, sidstr, "",
> + &cifs_idmap_key_acl);
> if (IS_ERR(sidkey)) {
> rc = -EINVAL;
> cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n",
> @@ -481,8 +502,7 @@ init_cifs_idmap(void)
>
> keyring = keyring_alloc(".cifs_idmap",
> GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
> - (KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ,
> + &cifs_idmap_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
> if (IS_ERR(keyring)) {
> ret = PTR_ERR(keyring);
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index 683310f26171..3b946fcf025c 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -2903,7 +2903,7 @@ cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
> }
>
> cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
> - key = request_key(&key_type_logon, desc, "");
> + key = request_key(&key_type_logon, desc, "", NULL);
> if (IS_ERR(key)) {
> if (!ses->domainName) {
> cifs_dbg(FYI, "domainName is NULL\n");
> @@ -2914,7 +2914,7 @@ cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
> /* didn't work, try to find a domain key */
> sprintf(desc, "cifs:d:%s", ses->domainName);
> cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
> - key = request_key(&key_type_logon, desc, "");
> + key = request_key(&key_type_logon, desc, "", NULL);
> if (IS_ERR(key)) {
> rc = PTR_ERR(key);
> goto out_err;
> diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
> index 1e11a683f63d..201e8715302b 100644
> --- a/fs/crypto/keyinfo.c
> +++ b/fs/crypto/keyinfo.c
> @@ -92,7 +92,7 @@ find_and_lock_process_key(const char *prefix,
> if (!description)
> return ERR_PTR(-ENOMEM);
>
> - key = request_key(&key_type_logon, description, NULL);
> + key = request_key(&key_type_logon, description, NULL, NULL);
> kfree(description);
> if (IS_ERR(key))
> return key;
> diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
> index e74cb2a0b299..6460bd2a4e9d 100644
> --- a/fs/ecryptfs/ecryptfs_kernel.h
> +++ b/fs/ecryptfs/ecryptfs_kernel.h
> @@ -105,7 +105,7 @@ ecryptfs_get_encrypted_key_payload_data(struct key *key)
>
> static inline struct key *ecryptfs_get_encrypted_key(char *sig)
> {
> - return request_key(&key_type_encrypted, sig, NULL);
> + return request_key(&key_type_encrypted, sig, NULL, NULL);
> }
>
> #else
> diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
> index e74fe84d0886..38f4e30ed730 100644
> --- a/fs/ecryptfs/keystore.c
> +++ b/fs/ecryptfs/keystore.c
> @@ -1625,7 +1625,7 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
> {
> int rc = 0;
>
> - (*auth_tok_key) = request_key(&key_type_user, sig, NULL);
> + (*auth_tok_key) = request_key(&key_type_user, sig, NULL, NULL);
> if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
> (*auth_tok_key) = ecryptfs_get_encrypted_key(sig);
> if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
> diff --git a/fs/fscache/object-list.c b/fs/fscache/object-list.c
> index 43e6e28c164f..6a672289e5ec 100644
> --- a/fs/fscache/object-list.c
> +++ b/fs/fscache/object-list.c
> @@ -321,7 +321,7 @@ static void fscache_objlist_config(struct fscache_objlist_data *data)
> const char *buf;
> int len;
>
> - key = request_key(&key_type_user, "fscache:objlist", NULL);
> + key = request_key(&key_type_user, "fscache:objlist", NULL, NULL);
> if (IS_ERR(key))
> goto no_config;
>
> diff --git a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
> index bf34ddaa2ad7..25f3f2f97ce9 100644
> --- a/fs/nfs/nfs4idmap.c
> +++ b/fs/nfs/nfs4idmap.c
> @@ -71,6 +71,25 @@ struct idmap {
> struct mutex idmap_mutex;
> };
>
> +static struct key_acl nfs_idmap_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_SEARCH | KEY_ACE_READ),
> + KEY_OWNER_ACE(KEY_ACE_VIEW),
> + }
> +};
> +
> +static struct key_acl nfs_idmap_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ),
> + }
> +};
> +
> /**
> * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
> * @fattr: fully initialised struct nfs_fattr
> @@ -200,8 +219,7 @@ int nfs_idmap_init(void)
>
> keyring = keyring_alloc(".id_resolver",
> GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
> - (KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ,
> + &nfs_idmap_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
> if (IS_ERR(keyring)) {
> ret = PTR_ERR(keyring);
> @@ -278,11 +296,12 @@ static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
> if (ret < 0)
> return ERR_PTR(ret);
>
> - rkey = request_key(&key_type_id_resolver, desc, "");
> + rkey = request_key(&key_type_id_resolver, desc, "", &nfs_idmap_key_acl);
> if (IS_ERR(rkey)) {
> mutex_lock(&idmap->idmap_mutex);
> rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
> - desc, "", 0, idmap);
> + desc, "", 0, idmap,
> + &nfs_idmap_key_acl);
> mutex_unlock(&idmap->idmap_mutex);
> }
> if (!IS_ERR(rkey))
> @@ -311,8 +330,6 @@ static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
> }
>
> rcu_read_lock();
> - rkey->perm |= KEY_USR_VIEW;
> -
> ret = key_validate(rkey);
> if (ret < 0)
> goto out_up;
> diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
> index 5bf5fd08879e..38bae9737166 100644
> --- a/fs/ubifs/auth.c
> +++ b/fs/ubifs/auth.c
> @@ -246,7 +246,7 @@ int ubifs_init_authentication(struct ubifs_info *c)
> snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
> c->auth_hash_name);
>
> - keyring_key = request_key(&key_type_logon, c->auth_key_name, NULL);
> + keyring_key = request_key(&key_type_logon, c->auth_key_name, NULL, NULL);
>
> if (IS_ERR(keyring_key)) {
> ubifs_err(c, "Failed to request key: %ld",
> diff --git a/include/linux/key.h b/include/linux/key.h
> index de190036512b..a38b89bd414c 100644
> --- a/include/linux/key.h
> +++ b/include/linux/key.h
> @@ -32,49 +32,14 @@
> /* key handle serial number */
> typedef int32_t key_serial_t;
>
> -/* key handle permissions mask */
> -typedef uint32_t key_perm_t;
> -
> struct key;
> struct net;
>
> #ifdef CONFIG_KEYS
>
> -#undef KEY_DEBUGGING
> +#include <linux/keyctl.h>
>
> -#define KEY_POS_VIEW 0x01000000 /* possessor can view a key's attributes */
> -#define KEY_POS_READ 0x02000000 /* possessor can read key payload / view keyring */
> -#define KEY_POS_WRITE 0x04000000 /* possessor can update key payload / add link to keyring */
> -#define KEY_POS_SEARCH 0x08000000 /* possessor can find a key in search / search a keyring */
> -#define KEY_POS_LINK 0x10000000 /* possessor can create a link to a key/keyring */
> -#define KEY_POS_SETATTR 0x20000000 /* possessor can set key attributes */
> -#define KEY_POS_ALL 0x3f000000
> -
> -#define KEY_USR_VIEW 0x00010000 /* user permissions... */
> -#define KEY_USR_READ 0x00020000
> -#define KEY_USR_WRITE 0x00040000
> -#define KEY_USR_SEARCH 0x00080000
> -#define KEY_USR_LINK 0x00100000
> -#define KEY_USR_SETATTR 0x00200000
> -#define KEY_USR_ALL 0x003f0000
> -
> -#define KEY_GRP_VIEW 0x00000100 /* group permissions... */
> -#define KEY_GRP_READ 0x00000200
> -#define KEY_GRP_WRITE 0x00000400
> -#define KEY_GRP_SEARCH 0x00000800
> -#define KEY_GRP_LINK 0x00001000
> -#define KEY_GRP_SETATTR 0x00002000
> -#define KEY_GRP_ALL 0x00003f00
> -
> -#define KEY_OTH_VIEW 0x00000001 /* third party permissions... */
> -#define KEY_OTH_READ 0x00000002
> -#define KEY_OTH_WRITE 0x00000004
> -#define KEY_OTH_SEARCH 0x00000008
> -#define KEY_OTH_LINK 0x00000010
> -#define KEY_OTH_SETATTR 0x00000020
> -#define KEY_OTH_ALL 0x0000003f
> -
> -#define KEY_PERM_UNDEF 0xffffffff
> +#undef KEY_DEBUGGING
>
> struct seq_file;
> struct user_struct;
> @@ -118,6 +83,36 @@ union key_payload {
> void *data[4];
> };
>
> +struct key_ace {
> + unsigned int type;
> + unsigned int perm;
> + union {
> + kuid_t uid;
> + kgid_t gid;
> + unsigned int subject_id;
> + };
> +};
> +
> +struct key_acl {
> + refcount_t usage;
> + unsigned short nr_ace;
> + bool possessor_viewable;
> + struct rcu_head rcu;
> + struct key_ace aces[];
> +};
> +
> +#define KEY_POSSESSOR_ACE(perms) { \
> + .type = KEY_ACE_SUBJ_STANDARD, \
> + .perm = perms, \
> + .subject_id = KEY_ACE_POSSESSOR \
> + }
> +
> +#define KEY_OWNER_ACE(perms) { \
> + .type = KEY_ACE_SUBJ_STANDARD, \
> + .perm = perms, \
> + .subject_id = KEY_ACE_OWNER \
> + }
> +
> /*****************************************************************************/
> /*
> * key reference with possession attribute handling
> @@ -187,6 +182,7 @@ struct key {
> struct rw_semaphore sem; /* change vs change sem */
> struct key_user *user; /* owner of this key */
> void *security; /* security data for this key */
> + struct key_acl __rcu *acl;
> union {
> time64_t expiry; /* time at which key expires (or 0) */
> time64_t revoked_at; /* time at which key was revoked */
> @@ -194,7 +190,6 @@ struct key {
> time64_t last_used_at; /* last time used for LRU keyring discard */
> kuid_t uid;
> kgid_t gid;
> - key_perm_t perm; /* access permissions */
> unsigned short quotalen; /* length added to quota */
> unsigned short datalen; /* payload data length
> * - may not match RCU dereferenced payload
> @@ -220,6 +215,7 @@ struct key {
> #define KEY_FLAG_UID_KEYRING 9 /* set if key is a user or user session keyring */
> #define KEY_FLAG_SET_WATCH_PROXY 10 /* Set if watch_proxy should be set on added keys */
> #define KEY_FLAG_SEEN 11 /* Set if returned by keyctl_find_oldest_key() */
> +#define KEY_FLAG_HAS_ACL 12 /* Set if KEYCTL_SETACL called on key */
>
> /* the key type and key description string
> * - the desc is used to match a key against search criteria
> @@ -268,7 +264,7 @@ extern struct key *key_alloc(struct key_type *type,
> const char *desc,
> kuid_t uid, kgid_t gid,
> const struct cred *cred,
> - key_perm_t perm,
> + struct key_acl *acl,
> unsigned long flags,
> struct key_restriction *restrict_link);
>
> @@ -304,18 +300,21 @@ static inline void key_ref_put(key_ref_t key_ref)
>
> extern struct key *request_key(struct key_type *type,
> const char *description,
> - const char *callout_info);
> + const char *callout_info,
> + struct key_acl *acl);
>
> extern struct key *request_key_with_auxdata(struct key_type *type,
> const char *description,
> const void *callout_info,
> size_t callout_len,
> - void *aux);
> + void *aux,
> + struct key_acl *acl);
>
> extern struct key *request_key_net(struct key_type *type,
> const char *description,
> struct net *net,
> - const char *callout_info);
> + const char *callout_info,
> + struct key_acl *acl);
>
> extern int wait_for_key_construction(struct key *key, bool intr);
>
> @@ -326,7 +325,7 @@ extern key_ref_t key_create_or_update(key_ref_t keyring,
> const char *description,
> const void *payload,
> size_t plen,
> - key_perm_t perm,
> + struct key_acl *acl,
> unsigned long flags);
>
> extern int key_update(key_ref_t key,
> @@ -346,7 +345,7 @@ extern int key_unlink(struct key *keyring,
>
> extern struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid,
> const struct cred *cred,
> - key_perm_t perm,
> + struct key_acl *acl,
> unsigned long flags,
> struct key_restriction *restrict_link,
> struct key *dest);
> @@ -378,19 +377,29 @@ static inline key_serial_t key_serial(const struct key *key)
> extern void key_set_timeout(struct key *, unsigned);
>
> extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
> - key_perm_t perm);
> + u32 desired_perm);
> extern void key_free_user_ns(struct user_namespace *);
>
> /*
> * 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 */
> +#define KEY_NEED_VIEW 0x001 /* Require permission to view attributes */
> +#define KEY_NEED_READ 0x002 /* Require permission to read content */
> +#define KEY_NEED_WRITE 0x004 /* Require permission to update / modify */
> +#define KEY_NEED_SEARCH 0x008 /* Require permission to search (keyring) or find (key) */
> +#define KEY_NEED_LINK 0x010 /* Require permission to link */
> +#define KEY_NEED_SETSEC 0x020 /* Require permission to set owner, group, ACL */
> +#define KEY_NEED_INVAL 0x040 /* Require permission to invalidate key */
> +#define KEY_NEED_REVOKE 0x080 /* Require permission to revoke key */
> +#define KEY_NEED_JOIN 0x100 /* Require permission to join keyring as session */
> +#define KEY_NEED_CLEAR 0x200 /* Require permission to clear a keyring */
> +#define KEY_NEED_ALL 0x3ff
> +
> +#define OLD_KEY_NEED_SETATTR 0x20 /* Used to be Require permission to change attributes */
> +
> +extern struct key_acl internal_key_acl;
> +extern struct key_acl internal_keyring_acl;
> +extern struct key_acl internal_writable_keyring_acl;
>
> static inline short key_read_state(const struct key *key)
> {
> diff --git a/include/uapi/linux/keyctl.h b/include/uapi/linux/keyctl.h
> index a2afb4512f34..50d7b6ca82ab 100644
> --- a/include/uapi/linux/keyctl.h
> +++ b/include/uapi/linux/keyctl.h
> @@ -15,6 +15,69 @@
>
> #include <linux/types.h>
>
> +/*
> + * Keyring permission grant definitions
> + */
> +enum key_ace_subject_type {
> + KEY_ACE_SUBJ_STANDARD = 0, /* subject is one of key_ace_standard_subject */
> + nr__key_ace_subject_type
> +};
> +
> +enum key_ace_standard_subject {
> + KEY_ACE_EVERYONE = 0, /* Everyone, including owner and group */
> + KEY_ACE_GROUP = 1, /* The key's group */
> + KEY_ACE_OWNER = 2, /* The owner of the key */
> + KEY_ACE_POSSESSOR = 3, /* Any process that possesses of the key */
> + nr__key_ace_standard_subject
> +};
> +
> +#define KEY_ACE_VIEW 0x00000001 /* Can describe the key */
> +#define KEY_ACE_READ 0x00000002 /* Can read the key content */
> +#define KEY_ACE_WRITE 0x00000004 /* Can update/modify the key content */
> +#define KEY_ACE_SEARCH 0x00000008 /* Can find the key by search */
> +#define KEY_ACE_LINK 0x00000010 /* Can make a link to the key */
> +#define KEY_ACE_SET_SECURITY 0x00000020 /* Can set owner, group, ACL */
> +#define KEY_ACE_INVAL 0x00000040 /* Can invalidate the key */
> +#define KEY_ACE_REVOKE 0x00000080 /* Can revoke the key */
> +#define KEY_ACE_JOIN 0x00000100 /* Can join keyring */
> +#define KEY_ACE_CLEAR 0x00000200 /* Can clear keyring */
> +#define KEY_ACE__PERMS 0xffffffff
> +
> +/*
> + * Old-style permissions mask, deprecated in favour of ACL.
> + */
> +#define KEY_POS_VIEW 0x01000000 /* possessor can view a key's attributes */
> +#define KEY_POS_READ 0x02000000 /* possessor can read key payload / view keyring */
> +#define KEY_POS_WRITE 0x04000000 /* possessor can update key payload / add link to keyring */
> +#define KEY_POS_SEARCH 0x08000000 /* possessor can find a key in search / search a keyring */
> +#define KEY_POS_LINK 0x10000000 /* possessor can create a link to a key/keyring */
> +#define KEY_POS_SETATTR 0x20000000 /* possessor can set key attributes */
> +#define KEY_POS_ALL 0x3f000000
> +
> +#define KEY_USR_VIEW 0x00010000 /* user permissions... */
> +#define KEY_USR_READ 0x00020000
> +#define KEY_USR_WRITE 0x00040000
> +#define KEY_USR_SEARCH 0x00080000
> +#define KEY_USR_LINK 0x00100000
> +#define KEY_USR_SETATTR 0x00200000
> +#define KEY_USR_ALL 0x003f0000
> +
> +#define KEY_GRP_VIEW 0x00000100 /* group permissions... */
> +#define KEY_GRP_READ 0x00000200
> +#define KEY_GRP_WRITE 0x00000400
> +#define KEY_GRP_SEARCH 0x00000800
> +#define KEY_GRP_LINK 0x00001000
> +#define KEY_GRP_SETATTR 0x00002000
> +#define KEY_GRP_ALL 0x00003f00
> +
> +#define KEY_OTH_VIEW 0x00000001 /* third party permissions... */
> +#define KEY_OTH_READ 0x00000002
> +#define KEY_OTH_WRITE 0x00000004
> +#define KEY_OTH_SEARCH 0x00000008
> +#define KEY_OTH_LINK 0x00000010
> +#define KEY_OTH_SETATTR 0x00000020
> +#define KEY_OTH_ALL 0x0000003f
> +
> /* special process keyring shortcut IDs */
> #define KEY_SPEC_THREAD_KEYRING -1 /* - key ID for thread-specific keyring */
> #define KEY_SPEC_PROCESS_KEYRING -2 /* - key ID for process-specific keyring */
> diff --git a/lib/digsig.c b/lib/digsig.c
> index 6ba6fcd92dd1..8cfa53585267 100644
> --- a/lib/digsig.c
> +++ b/lib/digsig.c
> @@ -227,7 +227,7 @@ int digsig_verify(struct key *keyring, const char *sig, int siglen,
> else
> key = key_ref_to_ptr(kref);
> } else {
> - key = request_key(&key_type_user, name, NULL);
> + key = request_key(&key_type_user, name, NULL, NULL);
> }
> if (IS_ERR(key)) {
> pr_err("key not found, id: %s\n", name);
> diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
> index 9cab80207ced..c6efe800392e 100644
> --- a/net/ceph/ceph_common.c
> +++ b/net/ceph/ceph_common.c
> @@ -305,7 +305,7 @@ static int get_secret(struct ceph_crypto_key *dst, const char *name) {
> int err = 0;
> struct ceph_crypto_key *ckey;
>
> - ukey = request_key(&key_type_ceph, name, NULL);
> + ukey = request_key(&key_type_ceph, name, NULL, NULL);
> if (IS_ERR(ukey)) {
> /* request_key errors don't map nicely to mount(2)
> errors; don't even try, but still printk */
> diff --git a/net/dns_resolver/dns_key.c b/net/dns_resolver/dns_key.c
> index 3e1a90669006..6b201531b165 100644
> --- a/net/dns_resolver/dns_key.c
> +++ b/net/dns_resolver/dns_key.c
> @@ -46,6 +46,15 @@ const struct cred *dns_resolver_cache;
>
> #define DNS_ERRORNO_OPTION "dnserror"
>
> +static struct key_acl dns_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_CLEAR),
> + }
> +};
> +
> /*
> * Preparse instantiation data for a dns_resolver key.
> *
> @@ -343,8 +352,7 @@ static int __init init_dns_resolver(void)
>
> keyring = keyring_alloc(".dns_resolver",
> GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
> - (KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ,
> + &dns_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
> if (IS_ERR(keyring)) {
> ret = PTR_ERR(keyring);
> diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
> index d88ea98da63e..3a6436a7931a 100644
> --- a/net/dns_resolver/dns_query.c
> +++ b/net/dns_resolver/dns_query.c
> @@ -46,6 +46,16 @@
>
> #include "internal.h"
>
> +static struct key_acl dns_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_SEARCH | KEY_ACE_READ),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_INVAL),
> + }
> +};
> +
> /**
> * dns_query - Query the DNS
> * @net: The network namespace to operate in.
> @@ -124,7 +134,8 @@ int dns_query(struct net *net,
> * add_key() to preinstall malicious redirections
> */
> saved_cred = override_creds(dns_resolver_cache);
> - rkey = request_key_net(&key_type_dns_resolver, desc, net, options);
> + rkey = request_key_net(&key_type_dns_resolver, desc, net, options,
> + &dns_key_acl);
> revert_creds(saved_cred);
> kfree(desc);
> if (IS_ERR(rkey)) {
> @@ -134,8 +145,6 @@ int dns_query(struct net *net,
>
> down_read(&rkey->sem);
> set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
> - rkey->perm |= KEY_USR_VIEW;
> -
> ret = key_validate(rkey);
> if (ret < 0)
> goto put;
> diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c
> index 1cc6b0c6cc42..284d7a025fbc 100644
> --- a/net/rxrpc/key.c
> +++ b/net/rxrpc/key.c
> @@ -27,6 +27,14 @@
> #include <keys/user-type.h>
> #include "ar-internal.h"
>
> +static struct key_acl rxrpc_null_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 1,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_READ),
> + }
> +};
> +
> static int rxrpc_vet_description_s(const char *);
> static int rxrpc_preparse(struct key_preparsed_payload *);
> static int rxrpc_preparse_s(struct key_preparsed_payload *);
> @@ -914,7 +922,8 @@ int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
> if (IS_ERR(description))
> return PTR_ERR(description);
>
> - key = request_key_net(&key_type_rxrpc, description, sock_net(&rx->sk), NULL);
> + key = request_key_net(&key_type_rxrpc, description, sock_net(&rx->sk),
> + NULL, NULL);
> if (IS_ERR(key)) {
> kfree(description);
> _leave(" = %ld", PTR_ERR(key));
> @@ -945,7 +954,8 @@ int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
> if (IS_ERR(description))
> return PTR_ERR(description);
>
> - key = request_key_net(&key_type_keyring, description, sock_net(&rx->sk), NULL);
> + key = request_key_net(&key_type_keyring, description, sock_net(&rx->sk),
> + NULL, NULL);
> if (IS_ERR(key)) {
> kfree(description);
> _leave(" = %ld", PTR_ERR(key));
> @@ -1026,7 +1036,7 @@ struct key *rxrpc_get_null_key(const char *keyname)
>
> key = key_alloc(&key_type_rxrpc, keyname,
> GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
> - KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA, NULL);
> + &rxrpc_null_key_acl, KEY_ALLOC_NOT_IN_QUOTA, NULL);
> if (IS_ERR(key))
> return key;
>
> diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
> index f45d6edecf99..c666dc72006a 100644
> --- a/security/integrity/digsig.c
> +++ b/security/integrity/digsig.c
> @@ -51,7 +51,8 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
>
> if (!keyring[id]) {
> keyring[id] =
> - request_key(&key_type_keyring, keyring_name[id], NULL);
> + request_key(&key_type_keyring, keyring_name[id],
> + NULL, NULL);
> if (IS_ERR(keyring[id])) {
> int err = PTR_ERR(keyring[id]);
> pr_err("no %s keyring: %d\n", keyring_name[id], err);
> @@ -73,14 +74,14 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
> return -EOPNOTSUPP;
> }
>
> -static int __integrity_init_keyring(const unsigned int id, key_perm_t perm,
> +static int __integrity_init_keyring(const unsigned int id, struct key_acl *acl,
> struct key_restriction *restriction)
> {
> const struct cred *cred = current_cred();
> int err = 0;
>
> keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
> - KGIDT_INIT(0), cred, perm,
> + KGIDT_INIT(0), cred, acl,
> KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
> if (IS_ERR(keyring[id])) {
> err = PTR_ERR(keyring[id]);
> @@ -95,10 +96,7 @@ static int __integrity_init_keyring(const unsigned int id, key_perm_t perm,
> int __init integrity_init_keyring(const unsigned int id)
> {
> struct key_restriction *restriction;
> - key_perm_t perm;
> -
> - perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
> - | KEY_USR_READ | KEY_USR_SEARCH;
> + struct key_acl *acl = &internal_keyring_acl;
>
> if (id == INTEGRITY_KEYRING_PLATFORM) {
> restriction = NULL;
> @@ -113,14 +111,14 @@ int __init integrity_init_keyring(const unsigned int id)
> return -ENOMEM;
>
> restriction->check = restrict_link_to_ima;
> - perm |= KEY_USR_WRITE;
> + acl = &internal_writable_keyring_acl;
>
> out:
> - return __integrity_init_keyring(id, perm, restriction);
> + return __integrity_init_keyring(id, &internal_keyring_acl, restriction);
> }
>
> -int __init integrity_add_key(const unsigned int id, const void *data,
> - off_t size, key_perm_t perm)
> +static int __init integrity_add_key(const unsigned int id, const void *data,
> + off_t size, struct key_acl *acl)
> {
> key_ref_t key;
> int rc = 0;
> @@ -129,7 +127,7 @@ int __init integrity_add_key(const unsigned int id, const void *data,
> return -EINVAL;
>
> key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
> - NULL, data, size, perm,
> + NULL, data, size, acl ?: &internal_key_acl,
> KEY_ALLOC_NOT_IN_QUOTA);
> if (IS_ERR(key)) {
> rc = PTR_ERR(key);
> @@ -149,7 +147,6 @@ int __init integrity_load_x509(const unsigned int id, const char *path)
> void *data;
> loff_t size;
> int rc;
> - key_perm_t perm;
>
> rc = kernel_read_file_from_path(path, &data, &size, 0,
> READING_X509_CERTIFICATE);
> @@ -158,21 +155,19 @@ int __init integrity_load_x509(const unsigned int id, const char *path)
> return rc;
> }
>
> - perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
> -
> pr_info("Loading X.509 certificate: %s\n", path);
> - rc = integrity_add_key(id, (const void *)data, size, perm);
> + rc = integrity_add_key(id, data, size, NULL);
>
> vfree(data);
> return rc;
> }
>
> int __init integrity_load_cert(const unsigned int id, const char *source,
> - const void *data, size_t len, key_perm_t perm)
> + const void *data, size_t len, struct key_acl *acl)
> {
> if (!data)
> return -EINVAL;
>
> pr_info("Loading X.509 certificate: %s\n", source);
> - return integrity_add_key(id, data, len, perm);
> + return integrity_add_key(id, data, len, acl);
> }
> diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
> index d775e03fbbcc..017cb6db521d 100644
> --- a/security/integrity/digsig_asymmetric.c
> +++ b/security/integrity/digsig_asymmetric.c
> @@ -57,7 +57,7 @@ static struct key *request_asymmetric_key(struct key *keyring, uint32_t keyid)
> else
> key = key_ref_to_ptr(kref);
> } else {
> - key = request_key(&key_type_asymmetric, name, NULL);
> + key = request_key(&key_type_asymmetric, name, NULL, NULL);
> }
>
> if (IS_ERR(key)) {
> diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
> index 43e2dc3a60d0..945f42b762e4 100644
> --- a/security/integrity/evm/evm_crypto.c
> +++ b/security/integrity/evm/evm_crypto.c
> @@ -358,7 +358,7 @@ int evm_init_key(void)
> struct encrypted_key_payload *ekp;
> int rc;
>
> - evm_key = request_key(&key_type_encrypted, EVMKEY, NULL);
> + evm_key = request_key(&key_type_encrypted, EVMKEY, NULL, NULL);
> if (IS_ERR(evm_key))
> return -ENOENT;
>
> diff --git a/security/integrity/ima/ima_mok.c b/security/integrity/ima/ima_mok.c
> index 073ddc9bce5b..ce48303cfacc 100644
> --- a/security/integrity/ima/ima_mok.c
> +++ b/security/integrity/ima/ima_mok.c
> @@ -21,6 +21,15 @@
> #include <keys/system_keyring.h>
>
>
> +static struct key_acl integrity_blacklist_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_WRITE | KEY_ACE_SEARCH),
> + }
> +};
> +
> struct key *ima_blacklist_keyring;
>
> /*
> @@ -40,9 +49,7 @@ __init int ima_mok_init(void)
>
> ima_blacklist_keyring = keyring_alloc(".ima_blacklist",
> KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
> - (KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ |
> - KEY_USR_WRITE | KEY_USR_SEARCH,
> + &integrity_blacklist_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA,
> restriction, NULL);
>
> diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
> index 7de59f44cba3..fbc1264af55f 100644
> --- a/security/integrity/integrity.h
> +++ b/security/integrity/integrity.h
> @@ -154,7 +154,7 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
> int __init integrity_init_keyring(const unsigned int id);
> int __init integrity_load_x509(const unsigned int id, const char *path);
> int __init integrity_load_cert(const unsigned int id, const char *source,
> - const void *data, size_t len, key_perm_t perm);
> + const void *data, size_t len, struct key_acl *acl);
> #else
>
> static inline int integrity_digsig_verify(const unsigned int id,
> @@ -172,7 +172,7 @@ static inline int integrity_init_keyring(const unsigned int id)
> static inline int __init integrity_load_cert(const unsigned int id,
> const char *source,
> const void *data, size_t len,
> - key_perm_t perm)
> + struct key_acl *acl)
> {
> return 0;
> }
> diff --git a/security/integrity/platform_certs/platform_keyring.c b/security/integrity/platform_certs/platform_keyring.c
> index bcafd7387729..80bb6f750045 100644
> --- a/security/integrity/platform_certs/platform_keyring.c
> +++ b/security/integrity/platform_certs/platform_keyring.c
> @@ -14,6 +14,15 @@
> #include <linux/slab.h>
> #include "../integrity.h"
>
> +static struct key_acl platform_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_READ),
> + KEY_OWNER_ACE(KEY_ACE_VIEW),
> + }
> +};
> +
> /**
> * add_to_platform_keyring - Add to platform keyring without validation.
> * @source: Source of key
> @@ -29,10 +38,8 @@ void __init add_to_platform_keyring(const char *source, const void *data,
> key_perm_t perm;
> int rc;
>
> - perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW;
> -
> rc = integrity_load_cert(INTEGRITY_KEYRING_PLATFORM, source, data, len,
> - perm);
> + &platform_key_acl);
> if (rc)
> pr_info("Error adding keys to platform keyring %s\n", source);
> }
> diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
> index 389a298274d3..376068ec5a4e 100644
> --- a/security/keys/encrypted-keys/encrypted.c
> +++ b/security/keys/encrypted-keys/encrypted.c
> @@ -307,7 +307,7 @@ static struct key *request_user_key(const char *master_desc, const u8 **master_k
> const struct user_key_payload *upayload;
> struct key *ukey;
>
> - ukey = request_key(&key_type_user, master_desc, NULL);
> + ukey = request_key(&key_type_user, master_desc, NULL, NULL);
> if (IS_ERR(ukey))
> goto error;
>
> diff --git a/security/keys/encrypted-keys/masterkey_trusted.c b/security/keys/encrypted-keys/masterkey_trusted.c
> index dc3d18cae642..3322e7eeafce 100644
> --- a/security/keys/encrypted-keys/masterkey_trusted.c
> +++ b/security/keys/encrypted-keys/masterkey_trusted.c
> @@ -33,7 +33,7 @@ struct key *request_trusted_key(const char *trusted_desc,
> struct trusted_key_payload *tpayload;
> struct key *tkey;
>
> - tkey = request_key(&key_type_trusted, trusted_desc, NULL);
> + tkey = request_key(&key_type_trusted, trusted_desc, NULL, NULL);
> if (IS_ERR(tkey))
> goto error;
>
> diff --git a/security/keys/gc.c b/security/keys/gc.c
> index c39721163d43..cb667becf224 100644
> --- a/security/keys/gc.c
> +++ b/security/keys/gc.c
> @@ -160,6 +160,7 @@ static noinline void key_gc_unused_keys(struct list_head *keys)
>
> key_user_put(key->user);
> key_put_tag(key->domain_tag);
> + key_put_acl(key->acl);
> kfree(key->description);
>
> memzero_explicit(key, sizeof(*key));
> @@ -229,7 +230,6 @@ static void key_garbage_collector(struct work_struct *work)
> if (key->type == key_gc_dead_keytype) {
> gc_state |= KEY_GC_FOUND_DEAD_KEY;
> set_bit(KEY_FLAG_DEAD, &key->flags);
> - key->perm = 0;
> goto skip_dead_key;
> } else if (key->type == &key_type_keyring &&
> key->restrict_link) {
> diff --git a/security/keys/internal.h b/security/keys/internal.h
> index 6be76caee874..9f9ecc1810c9 100644
> --- a/security/keys/internal.h
> +++ b/security/keys/internal.h
> @@ -89,8 +89,11 @@ extern struct rb_root key_serial_tree;
> extern spinlock_t key_serial_lock;
> extern struct mutex key_construction_mutex;
> extern wait_queue_head_t request_key_conswq;
> +extern struct key_acl default_key_acl;
> +extern struct key_acl joinable_keyring_acl;
>
> extern void key_set_index_key(struct keyring_index_key *index_key);
> +
> extern struct key_type *key_type_lookup(const char *type);
> extern void key_type_put(struct key_type *ktype);
> extern int key_get_type_from_user(char *, const char __user *, unsigned);
> @@ -157,6 +160,7 @@ extern struct key *request_key_and_link(struct key_type *type,
> const void *callout_info,
> size_t callout_len,
> void *aux,
> + struct key_acl *acl,
> struct key *dest_keyring,
> unsigned long flags);
>
> @@ -180,7 +184,11 @@ extern void key_gc_keytype(struct key_type *ktype);
>
> extern int key_task_permission(const key_ref_t key_ref,
> const struct cred *cred,
> - key_perm_t perm);
> + u32 desired_perm);
> +extern unsigned int key_acl_to_perm(const struct key_acl *acl);
> +extern long key_set_acl(struct key *key, struct key_acl *acl);
> +extern void key_put_acl(struct key_acl *acl);
> +
> #ifdef CONFIG_CONTAINERS
> extern int queue_request_key(struct key *);
> #else
> @@ -249,7 +257,7 @@ extern long keyctl_keyring_search(key_serial_t, const char __user *,
> const char __user *, key_serial_t);
> extern long keyctl_read_key(key_serial_t, char __user *, size_t);
> extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
> -extern long keyctl_setperm_key(key_serial_t, key_perm_t);
> +extern long keyctl_setperm_key(key_serial_t, unsigned int);
> extern long keyctl_instantiate_key(key_serial_t, const void __user *,
> size_t, key_serial_t);
> extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
> diff --git a/security/keys/key.c b/security/keys/key.c
> index 63513ffcf2e8..bca9d01c05fa 100644
> --- a/security/keys/key.c
> +++ b/security/keys/key.c
> @@ -199,7 +199,7 @@ static inline void key_alloc_serial(struct key *key)
> * @uid: The owner of the new key.
> * @gid: The group ID for the new key's group permissions.
> * @cred: The credentials specifying UID namespace.
> - * @perm: The permissions mask of the new key.
> + * @acl: The ACL to attach to the new key.
> * @flags: Flags specifying quota properties.
> * @restrict_link: Optional link restriction for new keyrings.
> *
> @@ -227,7 +227,7 @@ static inline void key_alloc_serial(struct key *key)
> */
> struct key *key_alloc(struct key_type *type, const char *desc,
> kuid_t uid, kgid_t gid, const struct cred *cred,
> - key_perm_t perm, unsigned long flags,
> + struct key_acl *acl, unsigned long flags,
> struct key_restriction *restrict_link)
> {
> struct key_user *user = NULL;
> @@ -250,6 +250,9 @@ struct key *key_alloc(struct key_type *type, const char *desc,
> desclen = strlen(desc);
> quotalen = desclen + 1 + type->def_datalen;
>
> + if (!acl)
> + acl = &default_key_acl;
> +
> /* get hold of the key tracking for this user */
> user = key_user_lookup(uid);
> if (!user)
> @@ -296,7 +299,8 @@ struct key *key_alloc(struct key_type *type, const char *desc,
> key->datalen = type->def_datalen;
> key->uid = uid;
> key->gid = gid;
> - key->perm = perm;
> + refcount_inc(&acl->usage);
> + rcu_assign_pointer(key->acl, acl);
> key->restrict_link = restrict_link;
> key->last_used_at = ktime_get_real_seconds();
>
> @@ -785,7 +789,7 @@ static inline key_ref_t __key_update(key_ref_t key_ref,
> * @description: The searchable description for the key.
> * @payload: The data to use to instantiate or update the key.
> * @plen: The length of @payload.
> - * @perm: The permissions mask for a new key.
> + * @acl: The ACL to attach if a key is created.
> * @flags: The quota flags for a new key.
> *
> * Search the destination keyring for a key of the same description and if one
> @@ -808,7 +812,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
> const char *description,
> const void *payload,
> size_t plen,
> - key_perm_t perm,
> + struct key_acl *acl,
> unsigned long flags)
> {
> struct keyring_index_key index_key = {
> @@ -899,22 +903,9 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
> goto found_matching_key;
> }
>
> - /* if the client doesn't provide, decide on the permissions we want */
> - if (perm == KEY_PERM_UNDEF) {
> - perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
> - perm |= KEY_USR_VIEW;
> -
> - if (index_key.type->read)
> - perm |= KEY_POS_READ;
> -
> - if (index_key.type == &key_type_keyring ||
> - index_key.type->update)
> - perm |= KEY_POS_WRITE;
> - }
> -
> /* allocate a new key */
> key = key_alloc(index_key.type, index_key.description,
> - cred->fsuid, cred->fsgid, cred, perm, flags, NULL);
> + cred->fsuid, cred->fsgid, cred, acl, flags, NULL);
> if (IS_ERR(key)) {
> key_ref = ERR_CAST(key);
> goto error_link_end;
> diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
> index a25799249b8a..2df896bfb8e4 100644
> --- a/security/keys/keyctl.c
> +++ b/security/keys/keyctl.c
> @@ -120,8 +120,7 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
> /* create or update the requested key and add it to the target
> * keyring */
> key_ref = key_create_or_update(keyring_ref, type, description,
> - payload, plen, KEY_PERM_UNDEF,
> - KEY_ALLOC_IN_QUOTA);
> + payload, plen, NULL, KEY_ALLOC_IN_QUOTA);
> if (!IS_ERR(key_ref)) {
> ret = key_ref_to_ptr(key_ref)->serial;
> key_ref_put(key_ref);
> @@ -211,7 +210,8 @@ SYSCALL_DEFINE4(request_key, const char __user *, _type,
>
> /* do the search */
> key = request_key_and_link(ktype, description, NULL, callout_info,
> - callout_len, NULL, key_ref_to_ptr(dest_ref),
> + callout_len, NULL, NULL,
> + key_ref_to_ptr(dest_ref),
> KEY_ALLOC_IN_QUOTA);
> if (IS_ERR(key)) {
> ret = PTR_ERR(key);
> @@ -373,16 +373,10 @@ long keyctl_revoke_key(key_serial_t id)
> struct key *key;
> long ret;
>
> - key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE);
> + key_ref = lookup_user_key(id, 0, KEY_NEED_REVOKE);
> if (IS_ERR(key_ref)) {
> ret = PTR_ERR(key_ref);
> - if (ret != -EACCES)
> - goto error;
> - key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR);
> - if (IS_ERR(key_ref)) {
> - ret = PTR_ERR(key_ref);
> - goto error;
> - }
> + goto error;
> }
>
> key = key_ref_to_ptr(key_ref);
> @@ -416,7 +410,7 @@ long keyctl_invalidate_key(key_serial_t id)
>
> kenter("%d", id);
>
> - key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH);
> + key_ref = lookup_user_key(id, 0, KEY_NEED_INVAL);
> if (IS_ERR(key_ref)) {
> ret = PTR_ERR(key_ref);
>
> @@ -461,7 +455,7 @@ long keyctl_keyring_clear(key_serial_t ringid)
> struct key *keyring;
> long ret;
>
> - keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
> + keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_CLEAR);
> if (IS_ERR(keyring_ref)) {
> ret = PTR_ERR(keyring_ref);
>
> @@ -639,6 +633,7 @@ long keyctl_describe_key(key_serial_t keyid,
> size_t buflen)
> {
> struct key *key, *instkey;
> + unsigned int perm;
> key_ref_t key_ref;
> char *infobuf;
> long ret;
> @@ -668,6 +663,10 @@ long keyctl_describe_key(key_serial_t keyid,
> key = key_ref_to_ptr(key_ref);
> desclen = strlen(key->description);
>
> + rcu_read_lock();
> + perm = key_acl_to_perm(rcu_dereference(key->acl));
> + rcu_read_unlock();
> +
> /* calculate how much information we're going to return */
> ret = -ENOMEM;
> infobuf = kasprintf(GFP_KERNEL,
> @@ -675,7 +674,7 @@ long keyctl_describe_key(key_serial_t keyid,
> key->type->name,
> from_kuid_munged(current_user_ns(), key->uid),
> from_kgid_munged(current_user_ns(), key->gid),
> - key->perm);
> + perm);
> if (!infobuf)
> goto error2;
> infolen = strlen(infobuf);
> @@ -892,7 +891,7 @@ 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_NEED_SETATTR);
> + KEY_NEED_SETSEC);
> if (IS_ERR(key_ref)) {
> ret = PTR_ERR(key_ref);
> goto error;
> @@ -988,18 +987,25 @@ long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group)
> * the key need not be fully instantiated yet. If the caller does not have
> * sysadmin capability, it may only change the permission on keys that it owns.
> */
> -long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
> +long keyctl_setperm_key(key_serial_t id, unsigned int perm)
> {
> + struct key_acl *acl;
> struct key *key;
> key_ref_t key_ref;
> long ret;
> + int nr, i, j;
>
> - ret = -EINVAL;
> if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
> - goto error;
> + return -EINVAL;
> +
> + nr = 0;
> + if (perm & KEY_POS_ALL) nr++;
> + if (perm & KEY_USR_ALL) nr++;
> + if (perm & KEY_GRP_ALL) nr++;
> + if (perm & KEY_OTH_ALL) nr++;
>
> key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL,
> - KEY_NEED_SETATTR);
> + KEY_NEED_SETSEC);
> if (IS_ERR(key_ref)) {
> ret = PTR_ERR(key_ref);
> goto error;
> @@ -1007,18 +1013,45 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
>
> key = key_ref_to_ptr(key_ref);
>
> - /* make the changes with the locks held to prevent chown/chmod races */
> - ret = -EACCES;
> - down_write(&key->sem);
> + ret = -EOPNOTSUPP;
> + if (test_bit(KEY_FLAG_HAS_ACL, &key->flags))
> + goto error_key;
>
> - /* if we're not the sysadmin, we can only change a key that we own */
> - if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) {
> - key->perm = perm;
> - notify_key(key, NOTIFY_KEY_SETATTR, 0);
> - ret = 0;
> + ret = -ENOMEM;
> + acl = kzalloc(struct_size(acl, aces, nr), GFP_KERNEL);
> + if (!acl)
> + goto error_key;
> +
> + refcount_set(&acl->usage, 1);
> + acl->nr_ace = nr;
> + j = 0;
> + for (i = 0; i < 4; i++) {
> + struct key_ace *ace = &acl->aces[j];
> + unsigned int subset = (perm >> (i * 8)) & KEY_OTH_ALL;
> +
> + if (!subset)
> + continue;
> + ace->type = KEY_ACE_SUBJ_STANDARD;
> + ace->subject_id = KEY_ACE_EVERYONE + i;
> + ace->perm = subset;
> + if (subset & (KEY_OTH_WRITE | KEY_OTH_SETATTR))
> + ace->perm |= KEY_ACE_REVOKE;
> + if (subset & KEY_OTH_SEARCH)
> + ace->perm |= KEY_ACE_INVAL;
> + if (key->type == &key_type_keyring) {
> + if (subset & KEY_OTH_SEARCH)
> + ace->perm |= KEY_ACE_JOIN;
> + if (subset & KEY_OTH_WRITE)
> + ace->perm |= KEY_ACE_CLEAR;
> + }
> + j++;
> }
>
> + /* make the changes with the locks held to prevent chown/chmod races */
> + down_write(&key->sem);
> + ret = key_set_acl(key, acl);
> up_write(&key->sem);
> +error_key:
> key_put(key);
> error:
> return ret;
> @@ -1383,7 +1416,7 @@ 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_NEED_SETATTR);
> + KEY_NEED_SETSEC);
> if (IS_ERR(key_ref)) {
> /* setting the timeout on a key under construction is permitted
> * if we have the authorisation token handy */
> @@ -1654,7 +1687,7 @@ long keyctl_restrict_keyring(key_serial_t id, const char __user *_type,
> char *restriction = NULL;
> long ret;
>
> - key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR);
> + key_ref = lookup_user_key(id, 0, KEY_NEED_SETSEC);
> if (IS_ERR(key_ref))
> return PTR_ERR(key_ref);
>
> @@ -1819,7 +1852,7 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3,
>
> case KEYCTL_SETPERM:
> return keyctl_setperm_key((key_serial_t) arg2,
> - (key_perm_t) arg3);
> + (unsigned int)arg3);
>
> case KEYCTL_INSTANTIATE:
> return keyctl_instantiate_key((key_serial_t) arg2,
> diff --git a/security/keys/keyring.c b/security/keys/keyring.c
> index 14df79814ea0..64f590632891 100644
> --- a/security/keys/keyring.c
> +++ b/security/keys/keyring.c
> @@ -518,11 +518,19 @@ static long keyring_read(const struct key *keyring,
> return ret;
> }
>
> -/*
> - * Allocate a keyring and link into the destination keyring.
> +/**
> + * keyring_alloc - Allocate a keyring and link into the destination
> + * @description: The key description to allow the key to be searched out.
> + * @uid: The owner of the new key.
> + * @gid: The group ID for the new key's group permissions.
> + * @cred: The credentials specifying UID namespace.
> + * @acl: The ACL to attach to the new key.
> + * @flags: Flags specifying quota properties.
> + * @restrict_link: Optional link restriction for new keyrings.
> + * @dest: Destination keyring.
> */
> struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid,
> - const struct cred *cred, key_perm_t perm,
> + const struct cred *cred, struct key_acl *acl,
> unsigned long flags,
> struct key_restriction *restrict_link,
> struct key *dest)
> @@ -531,7 +539,7 @@ struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid,
> int ret;
>
> keyring = key_alloc(&key_type_keyring, description,
> - uid, gid, cred, perm, flags, restrict_link);
> + uid, gid, cred, acl, flags, restrict_link);
> if (!IS_ERR(keyring)) {
> ret = key_instantiate_and_link(keyring, NULL, 0, dest, NULL);
> if (ret < 0) {
> @@ -1125,10 +1133,11 @@ key_ref_t find_key_to_update(key_ref_t keyring_ref,
> /*
> * Find a keyring with the specified name.
> *
> - * Only keyrings that have nonzero refcount, are not revoked, and are owned by a
> - * user in the current user namespace are considered. If @uid_keyring is %true,
> - * the keyring additionally must have been allocated as a user or user session
> - * keyring; otherwise, it must grant Search permission directly to the caller.
> + * Only keyrings that have nonzero refcount, are not revoked, and are owned by
> + * a user in the current user namespace are considered. If @uid_keyring is
> + * %true, the keyring additionally must have been allocated as a user or user
> + * session keyring; otherwise, it must grant JOIN permission directly to the
> + * caller (ie. not through possession).
> *
> * Returns a pointer to the keyring with the keyring's refcount having being
> * incremented on success. -ENOKEY is returned if a key could not be found.
> @@ -1162,7 +1171,7 @@ struct key *find_keyring_by_name(const char *name, bool uid_keyring)
> continue;
> } else {
> if (key_permission(make_key_ref(keyring, 0),
> - KEY_NEED_SEARCH) < 0)
> + KEY_NEED_JOIN) < 0)
> continue;
> }
>
> diff --git a/security/keys/permission.c b/security/keys/permission.c
> index 06df9d5e7572..8dc6e80f6fd0 100644
> --- a/security/keys/permission.c
> +++ b/security/keys/permission.c
> @@ -11,13 +11,62 @@
>
> #include <linux/export.h>
> #include <linux/security.h>
> +#include <linux/user_namespace.h>
> +#include <linux/uaccess.h>
> #include "internal.h"
>
> +struct key_acl default_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE__PERMS & ~KEY_ACE_JOIN),
> + KEY_OWNER_ACE(KEY_ACE_VIEW),
> + }
> +};
> +
> +struct key_acl joinable_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE__PERMS & ~KEY_ACE_JOIN),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_LINK | KEY_ACE_JOIN),
> + }
> +};
> +
> +struct key_acl internal_key_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_SEARCH),
> + }
> +};
> +
> +struct key_acl internal_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_SEARCH),
> + }
> +};
> +
> +struct key_acl internal_writable_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_WRITE | KEY_ACE_SEARCH),
> + }
> +};
> +
> /**
> * key_task_permission - Check a key can be used
> * @key_ref: The key to check.
> * @cred: The credentials to use.
> - * @perm: The permissions to check for.
> + * @desired_perm: The permission to check for.
> *
> * Check to see whether permission is granted to use a key in the desired way,
> * but permit the security modules to override.
> @@ -28,53 +77,73 @@
> * permissions bits or the LSM check.
> */
> int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
> - unsigned perm)
> + unsigned int desired_perm)
> {
> - struct key *key;
> - key_perm_t kperm;
> - int ret;
> + const struct key_acl *acl;
> + const struct key *key;
> + unsigned int allow = 0;
> + int i;
> +
> + BUILD_BUG_ON(KEY_NEED_VIEW != KEY_ACE_VIEW ||
> + KEY_NEED_READ != KEY_ACE_READ ||
> + KEY_NEED_WRITE != KEY_ACE_WRITE ||
> + KEY_NEED_SEARCH != KEY_ACE_SEARCH ||
> + KEY_NEED_LINK != KEY_ACE_LINK ||
> + KEY_NEED_SETSEC != KEY_ACE_SET_SECURITY ||
> + KEY_NEED_INVAL != KEY_ACE_INVAL ||
> + KEY_NEED_REVOKE != KEY_ACE_REVOKE ||
> + KEY_NEED_JOIN != KEY_ACE_JOIN ||
> + KEY_NEED_CLEAR != KEY_ACE_CLEAR);
>
> key = key_ref_to_ptr(key_ref);
>
> - /* use the second 8-bits of permissions for keys the caller owns */
> - if (uid_eq(key->uid, cred->fsuid)) {
> - kperm = key->perm >> 16;
> - goto use_these_perms;
> - }
> + rcu_read_lock();
>
> - /* use the third 8-bits of permissions for keys the caller has a group
> - * membership in common with */
> - if (gid_valid(key->gid) && key->perm & KEY_GRP_ALL) {
> - if (gid_eq(key->gid, cred->fsgid)) {
> - kperm = key->perm >> 8;
> - goto use_these_perms;
> - }
> + acl = rcu_dereference(key->acl);
> + if (!acl || acl->nr_ace == 0)
> + goto no_access_rcu;
> +
> + for (i = 0; i < acl->nr_ace; i++) {
> + const struct key_ace *ace = &acl->aces[i];
>
> - ret = groups_search(cred->group_info, key->gid);
> - if (ret) {
> - kperm = key->perm >> 8;
> - goto use_these_perms;
> + switch (ace->type) {
> + case KEY_ACE_SUBJ_STANDARD:
> + switch (ace->subject_id) {
> + case KEY_ACE_POSSESSOR:
> + if (is_key_possessed(key_ref))
> + allow |= ace->perm;
> + break;
> + case KEY_ACE_OWNER:
> + if (uid_eq(key->uid, cred->fsuid))
> + allow |= ace->perm;
> + break;
> + case KEY_ACE_GROUP:
> + if (gid_valid(key->gid)) {
> + if (gid_eq(key->gid, cred->fsgid))
> + allow |= ace->perm;
> + else if (groups_search(cred->group_info, key->gid))
> + allow |= ace->perm;
> + }
> + break;
> + case KEY_ACE_EVERYONE:
> + allow |= ace->perm;
> + break;
> + }
> + break;
> }
> }
>
> - /* otherwise use the least-significant 8-bits */
> - kperm = key->perm;
> -
> -use_these_perms:
> + rcu_read_unlock();
>
> - /* use the top 8-bits of permissions for keys the caller possesses
> - * - possessor permissions are additive with other permissions
> - */
> - if (is_key_possessed(key_ref))
> - kperm |= key->perm >> 24;
> + if (!(allow & desired_perm))
> + goto no_access;
>
> - kperm = kperm & perm & KEY_NEED_ALL;
> + return security_key_permission(key_ref, cred, desired_perm);
>
> - if (kperm != perm)
> - return -EACCES;
> -
> - /* let LSM be the final arbiter */
> - return security_key_permission(key_ref, cred, perm);
> +no_access_rcu:
> + rcu_read_unlock();
> +no_access:
> + return -EACCES;
> }
> EXPORT_SYMBOL(key_task_permission);
>
> @@ -108,3 +177,100 @@ int key_validate(const struct key *key)
> return 0;
> }
> EXPORT_SYMBOL(key_validate);
> +
> +/*
> + * Roughly render an ACL to an old-style permissions mask. We cannot
> + * accurately render what the ACL, particularly if it has ACEs that represent
> + * subjects outside of { poss, user, group, other }.
> + */
> +unsigned int key_acl_to_perm(const struct key_acl *acl)
> +{
> + unsigned int perm = 0, tperm;
> + int i;
> +
> + BUILD_BUG_ON(KEY_OTH_VIEW != KEY_ACE_VIEW ||
> + KEY_OTH_READ != KEY_ACE_READ ||
> + KEY_OTH_WRITE != KEY_ACE_WRITE ||
> + KEY_OTH_SEARCH != KEY_ACE_SEARCH ||
> + KEY_OTH_LINK != KEY_ACE_LINK ||
> + KEY_OTH_SETATTR != KEY_ACE_SET_SECURITY);
> +
> + if (!acl || acl->nr_ace == 0)
> + return 0;
> +
> + for (i = 0; i < acl->nr_ace; i++) {
> + const struct key_ace *ace = &acl->aces[i];
> +
> + switch (ace->type) {
> + case KEY_ACE_SUBJ_STANDARD:
> + tperm = ace->perm & KEY_OTH_ALL;
> +
> + /* Invalidation and joining were allowed by SEARCH */
> + if (ace->perm & (KEY_ACE_INVAL | KEY_ACE_JOIN))
> + tperm |= KEY_OTH_SEARCH;
> +
> + /* Revocation was allowed by either SETATTR or WRITE */
> + if ((ace->perm & KEY_ACE_REVOKE) && !(tperm & KEY_OTH_SETATTR))
> + tperm |= KEY_OTH_WRITE;
> +
> + /* Clearing was allowed by WRITE */
> + if (ace->perm & KEY_ACE_CLEAR)
> + tperm |= KEY_OTH_WRITE;
> +
> + switch (ace->subject_id) {
> + case KEY_ACE_POSSESSOR:
> + perm |= tperm << 24;
> + break;
> + case KEY_ACE_OWNER:
> + perm |= tperm << 16;
> + break;
> + case KEY_ACE_GROUP:
> + perm |= tperm << 8;
> + break;
> + case KEY_ACE_EVERYONE:
> + perm |= tperm << 0;
> + break;
> + }
> + }
> + }
> +
> + return perm;
> +}
> +
> +/*
> + * Destroy a key's ACL.
> + */
> +void key_put_acl(struct key_acl *acl)
> +{
> + if (acl && refcount_dec_and_test(&acl->usage))
> + kfree_rcu(acl, rcu);
> +}
> +
> +/*
> + * Try to set the ACL. This either attaches or discards the proposed ACL.
> + */
> +long key_set_acl(struct key *key, struct key_acl *acl)
> +{
> + int i;
> +
> + /* If we're not the sysadmin, we can only change a key that we own. */
> + if (!capable(CAP_SYS_ADMIN) && !uid_eq(key->uid, current_fsuid())) {
> + key_put_acl(acl);
> + return -EACCES;
> + }
> +
> + for (i = 0; i < acl->nr_ace; i++) {
> + const struct key_ace *ace = &acl->aces[i];
> + if (ace->type == KEY_ACE_SUBJ_STANDARD &&
> + ace->subject_id == KEY_ACE_POSSESSOR) {
> + if (ace->perm & KEY_ACE_VIEW)
> + acl->possessor_viewable = true;
> + break;
> + }
> + }
> +
> + rcu_swap_protected(key->acl, acl, lockdep_is_held(&key->sem));
> + notify_key(key, NOTIFY_KEY_SETATTR, 0);
> + key_put_acl(acl);
> + return 0;
> +}
> diff --git a/security/keys/persistent.c b/security/keys/persistent.c
> index c9fbe63adc58..0a115cc543df 100644
> --- a/security/keys/persistent.c
> +++ b/security/keys/persistent.c
> @@ -16,6 +16,27 @@
>
> unsigned persistent_keyring_expiry = 3 * 24 * 3600; /* Expire after 3 days of non-use */
>
> +static struct key_acl persistent_register_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ),
> + }
> +};
> +
> +static struct key_acl persistent_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_WRITE |
> + KEY_ACE_SEARCH | KEY_ACE_LINK |
> + KEY_ACE_CLEAR | KEY_ACE_INVAL),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ),
> + }
> +};
> +
> /*
> * Create the persistent keyring register for the current user namespace.
> *
> @@ -26,8 +47,7 @@ static int key_create_persistent_register(struct user_namespace *ns)
> struct key *reg = keyring_alloc(".persistent_register",
> KUIDT_INIT(0), KGIDT_INIT(0),
> current_cred(),
> - ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ),
> + &persistent_register_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
> if (IS_ERR(reg))
> return PTR_ERR(reg);
> @@ -60,8 +80,7 @@ static key_ref_t key_create_persistent(struct user_namespace *ns, kuid_t uid,
>
> persistent = keyring_alloc(index_key->description,
> uid, INVALID_GID, current_cred(),
> - ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
> - KEY_USR_VIEW | KEY_USR_READ),
> + &persistent_keyring_acl,
> KEY_ALLOC_NOT_IN_QUOTA, NULL,
> ns->persistent_keyring_register);
> if (IS_ERR(persistent))
> diff --git a/security/keys/proc.c b/security/keys/proc.c
> index d2b802072693..d697a2e95217 100644
> --- a/security/keys/proc.c
> +++ b/security/keys/proc.c
> @@ -154,6 +154,7 @@ static void proc_keys_stop(struct seq_file *p, void *v)
>
> static int proc_keys_show(struct seq_file *m, void *v)
> {
> + const struct key_acl *acl;
> struct rb_node *_p = v;
> struct key *key = rb_entry(_p, struct key, serial_node);
> unsigned long flags;
> @@ -161,6 +162,7 @@ static int proc_keys_show(struct seq_file *m, void *v)
> time64_t now, expiry;
> char xbuf[16];
> short state;
> + bool check_pos;
> u64 timo;
> int rc;
>
> @@ -174,12 +176,16 @@ static int proc_keys_show(struct seq_file *m, void *v)
> .flags = KEYRING_SEARCH_NO_STATE_CHECK,
> };
>
> - key_ref = make_key_ref(key, 0);
> + rcu_read_lock();
> +
> + acl = rcu_dereference(key->acl);
> + check_pos = acl->possessor_viewable;
>
> /* determine if the key is possessed by this process (a test we can
> * skip if the key does not indicate the possessor can view it
> */
> - if (key->perm & KEY_POS_VIEW) {
> + key_ref = make_key_ref(key, 0);
> + if (check_pos) {
> skey_ref = search_my_process_keyrings(&ctx);
> if (!IS_ERR(skey_ref)) {
> key_ref_put(skey_ref);
> @@ -190,12 +196,10 @@ static int proc_keys_show(struct seq_file *m, void *v)
> /* check whether the current task is allowed to view the key */
> rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW);
> if (rc < 0)
> - return 0;
> + goto out;
>
> now = ktime_get_real_seconds();
>
> - rcu_read_lock();
> -
> /* come up with a suitable timeout value */
> expiry = READ_ONCE(key->expiry);
> if (expiry == 0) {
> @@ -234,7 +238,7 @@ static int proc_keys_show(struct seq_file *m, void *v)
> showflag(flags, 'i', KEY_FLAG_INVALIDATED),
> refcount_read(&key->usage),
> xbuf,
> - key->perm,
> + key_acl_to_perm(acl),
> from_kuid_munged(seq_user_ns(m), key->uid),
> from_kgid_munged(seq_user_ns(m), key->gid),
> key->type->name);
> @@ -245,6 +249,7 @@ static int proc_keys_show(struct seq_file *m, void *v)
> key->type->describe(key, m);
> seq_putc(m, '\n');
>
> +out:
> rcu_read_unlock();
> return 0;
> }
> diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
> index 39d3cbac920c..0a231ede4d2b 100644
> --- a/security/keys/process_keys.c
> +++ b/security/keys/process_keys.c
> @@ -39,6 +39,37 @@ struct key_user root_key_user = {
> .uid = GLOBAL_ROOT_UID,
> };
>
> +static struct key_acl user_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_WRITE |
> + KEY_ACE_SEARCH | KEY_ACE_LINK),
> + KEY_OWNER_ACE(KEY_ACE__PERMS & ~(KEY_ACE_JOIN | KEY_ACE_SET_SECURITY)),
> + }
> +};
> +
> +static struct key_acl session_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE__PERMS & ~KEY_ACE_JOIN),
> + KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ),
> + }
> +};
> +
> +static struct key_acl thread_and_process_keyring_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE__PERMS & ~(KEY_ACE_JOIN | KEY_ACE_SET_SECURITY)),
> + KEY_OWNER_ACE(KEY_ACE_VIEW),
> + }
> +};
> +
> /*
> * Install the user and user session keyrings for the current process's UID.
> */
> @@ -47,12 +78,10 @@ int install_user_keyrings(void)
> struct user_struct *user;
> const struct cred *cred;
> struct key *uid_keyring, *session_keyring;
> - key_perm_t user_keyring_perm;
> char buf[20];
> int ret;
> uid_t uid;
>
> - user_keyring_perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL;
> cred = current_cred();
> user = cred->user;
> uid = from_kuid(cred->user_ns, user->uid);
> @@ -77,9 +106,9 @@ int install_user_keyrings(void)
> uid_keyring = find_keyring_by_name(buf, true);
> if (IS_ERR(uid_keyring)) {
> uid_keyring = keyring_alloc(buf, user->uid, INVALID_GID,
> - cred, user_keyring_perm,
> + cred, &user_keyring_acl,
> KEY_ALLOC_UID_KEYRING |
> - KEY_ALLOC_IN_QUOTA,
> + KEY_ALLOC_IN_QUOTA,
> NULL, NULL);
> if (IS_ERR(uid_keyring)) {
> ret = PTR_ERR(uid_keyring);
> @@ -95,9 +124,9 @@ int install_user_keyrings(void)
> if (IS_ERR(session_keyring)) {
> session_keyring =
> keyring_alloc(buf, user->uid, INVALID_GID,
> - cred, user_keyring_perm,
> + cred, &user_keyring_acl,
> KEY_ALLOC_UID_KEYRING |
> - KEY_ALLOC_IN_QUOTA,
> + KEY_ALLOC_IN_QUOTA,
> NULL, NULL);
> if (IS_ERR(session_keyring)) {
> ret = PTR_ERR(session_keyring);
> @@ -144,7 +173,7 @@ int install_thread_keyring_to_cred(struct cred *new)
> return 0;
>
> keyring = keyring_alloc("_tid", new->uid, new->gid, new,
> - KEY_POS_ALL | KEY_USR_VIEW,
> + &thread_and_process_keyring_acl,
> KEY_ALLOC_QUOTA_OVERRUN,
> NULL, NULL);
> if (IS_ERR(keyring))
> @@ -191,7 +220,7 @@ int install_process_keyring_to_cred(struct cred *new)
> return 0;
>
> keyring = keyring_alloc("_pid", new->uid, new->gid, new,
> - KEY_POS_ALL | KEY_USR_VIEW,
> + &thread_and_process_keyring_acl,
> KEY_ALLOC_QUOTA_OVERRUN,
> NULL, NULL);
> if (IS_ERR(keyring))
> @@ -245,8 +274,7 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring)
> flags = KEY_ALLOC_IN_QUOTA;
>
> keyring = keyring_alloc("_ses", cred->uid, cred->gid, cred,
> - KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
> - flags, NULL, NULL);
> + &session_keyring_acl, flags, NULL, NULL);
> if (IS_ERR(keyring))
> return PTR_ERR(keyring);
> } else {
> @@ -554,7 +582,7 @@ bool lookup_user_key_possessed(const struct key *key,
> * returned key reference.
> */
> key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
> - key_perm_t perm)
> + unsigned int desired_perm)
> {
> struct keyring_search_context ctx = {
> .match_data.cmp = lookup_user_key_possessed,
> @@ -740,12 +768,12 @@ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
> case -ERESTARTSYS:
> goto invalid_key;
> default:
> - if (perm)
> + if (desired_perm)
> goto invalid_key;
> case 0:
> break;
> }
> - } else if (perm) {
> + } else if (desired_perm) {
> ret = key_validate(key);
> if (ret < 0)
> goto invalid_key;
> @@ -757,9 +785,11 @@ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
> goto invalid_key;
>
> /* check the permissions */
> - ret = key_task_permission(key_ref, ctx.cred, perm);
> - if (ret < 0)
> - goto invalid_key;
> + if (desired_perm) {
> + ret = key_task_permission(key_ref, ctx.cred, desired_perm);
> + if (ret < 0)
> + goto invalid_key;
> + }
>
> key->last_used_at = ktime_get_real_seconds();
>
> @@ -824,13 +854,13 @@ long join_session_keyring(const char *name)
> if (PTR_ERR(keyring) == -ENOKEY) {
> /* not found - try and create a new one */
> keyring = keyring_alloc(
> - name, old->uid, old->gid, old,
> - KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_LINK,
> + name, old->uid, old->gid, old, &joinable_keyring_acl,
> KEY_ALLOC_IN_QUOTA, NULL, NULL);
> if (IS_ERR(keyring)) {
> ret = PTR_ERR(keyring);
> goto error2;
> }
> + goto no_perm_test;
> } else if (IS_ERR(keyring)) {
> ret = PTR_ERR(keyring);
> goto error2;
> @@ -839,6 +869,12 @@ long join_session_keyring(const char *name)
> goto error3;
> }
>
> + ret = key_task_permission(make_key_ref(keyring, false), old,
> + KEY_NEED_JOIN);
> + if (ret < 0)
> + goto error3;
> +
> +no_perm_test:
> /* we've got a keyring - now to install it */
> ret = install_session_keyring_to_cred(new, keyring);
> if (ret < 0)
> diff --git a/security/keys/request_key.c b/security/keys/request_key.c
> index 10244b6fbf5d..0d609c1efece 100644
> --- a/security/keys/request_key.c
> +++ b/security/keys/request_key.c
> @@ -115,8 +115,7 @@ static int call_sbin_request_key(struct key *authkey)
>
> cred = get_current_cred();
> keyring = keyring_alloc(desc, cred->fsuid, cred->fsgid, cred,
> - KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
> - KEY_ALLOC_QUOTA_OVERRUN, NULL, NULL);
> + NULL, KEY_ALLOC_QUOTA_OVERRUN, NULL, NULL);
> put_cred(cred);
> if (IS_ERR(keyring)) {
> ret = PTR_ERR(keyring);
> @@ -344,11 +343,11 @@ static int construct_alloc_key(struct keyring_search_context *ctx,
> struct key *dest_keyring,
> unsigned long flags,
> struct key_user *user,
> + struct key_acl *acl,
> struct key **_key)
> {
> struct assoc_array_edit *edit;
> struct key *key;
> - key_perm_t perm;
> key_ref_t key_ref;
> int ret;
>
> @@ -358,17 +357,9 @@ static int construct_alloc_key(struct keyring_search_context *ctx,
> *_key = NULL;
> mutex_lock(&user->cons_lock);
>
> - perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
> - perm |= KEY_USR_VIEW;
> - if (ctx->index_key.type->read)
> - perm |= KEY_POS_READ;
> - if (ctx->index_key.type == &key_type_keyring ||
> - ctx->index_key.type->update)
> - perm |= KEY_POS_WRITE;
> -
> key = key_alloc(ctx->index_key.type, ctx->index_key.description,
> ctx->cred->fsuid, ctx->cred->fsgid, ctx->cred,
> - perm, flags, NULL);
> + acl, flags, NULL);
> if (IS_ERR(key))
> goto alloc_failed;
>
> @@ -444,6 +435,7 @@ static struct key *construct_key_and_link(struct keyring_search_context *ctx,
> const char *callout_info,
> size_t callout_len,
> void *aux,
> + struct key_acl *acl,
> struct key *dest_keyring,
> unsigned long flags)
> {
> @@ -466,7 +458,7 @@ static struct key *construct_key_and_link(struct keyring_search_context *ctx,
> goto error_put_dest_keyring;
> }
>
> - ret = construct_alloc_key(ctx, dest_keyring, flags, user, &key);
> + ret = construct_alloc_key(ctx, dest_keyring, flags, user, acl, &key);
> key_user_put(user);
>
> if (ret == 0) {
> @@ -504,6 +496,7 @@ static struct key *construct_key_and_link(struct keyring_search_context *ctx,
> * @callout_info: The data to pass to the instantiation upcall (or NULL).
> * @callout_len: The length of callout_info.
> * @aux: Auxiliary data for the upcall.
> + * @acl: The ACL to attach if a new key is created.
> * @dest_keyring: Where to cache the key.
> * @flags: Flags to key_alloc().
> *
> @@ -531,6 +524,7 @@ struct key *request_key_and_link(struct key_type *type,
> const void *callout_info,
> size_t callout_len,
> void *aux,
> + struct key_acl *acl,
> struct key *dest_keyring,
> unsigned long flags)
> {
> @@ -593,7 +587,7 @@ struct key *request_key_and_link(struct key_type *type,
> goto error_free;
>
> key = construct_key_and_link(&ctx, callout_info, callout_len,
> - aux, dest_keyring, flags);
> + aux, acl, dest_keyring, flags);
> }
>
> error_free:
> @@ -635,6 +629,7 @@ EXPORT_SYMBOL(wait_for_key_construction);
> * @type: Type of key.
> * @description: The searchable description of the key.
> * @callout_info: The data to pass to the instantiation upcall (or NULL).
> + * @acl: The ACL to attach if a new key is created.
> *
> * As for request_key_and_link() except that it does not add the returned key
> * to a keyring if found, new keys are always allocated in the user's quota,
> @@ -646,7 +641,8 @@ EXPORT_SYMBOL(wait_for_key_construction);
> */
> struct key *request_key(struct key_type *type,
> const char *description,
> - const char *callout_info)
> + const char *callout_info,
> + struct key_acl *acl)
> {
> struct key *key;
> size_t callout_len = 0;
> @@ -656,7 +652,7 @@ struct key *request_key(struct key_type *type,
> callout_len = strlen(callout_info);
> key = request_key_and_link(type, description, NULL,
> callout_info, callout_len,
> - NULL, NULL, KEY_ALLOC_IN_QUOTA);
> + NULL, acl, NULL, KEY_ALLOC_IN_QUOTA);
> if (!IS_ERR(key)) {
> ret = wait_for_key_construction(key, false);
> if (ret < 0) {
> @@ -675,6 +671,7 @@ EXPORT_SYMBOL(request_key);
> * @callout_info: The data to pass to the instantiation upcall (or NULL).
> * @callout_len: The length of callout_info.
> * @aux: Auxiliary data for the upcall.
> + * @acl: The ACL to attach if a new key is created.
> *
> * As for request_key_and_link() except that it does not add the returned key
> * to a keyring if found and new keys are always allocated in the user's quota.
> @@ -686,14 +683,15 @@ struct key *request_key_with_auxdata(struct key_type *type,
> const char *description,
> const void *callout_info,
> size_t callout_len,
> - void *aux)
> + void *aux,
> + struct key_acl *acl)
> {
> struct key *key;
> int ret;
>
> key = request_key_and_link(type, description, NULL,
> callout_info, callout_len,
> - aux, NULL, KEY_ALLOC_IN_QUOTA);
> + aux, acl, NULL, KEY_ALLOC_IN_QUOTA);
> if (!IS_ERR(key)) {
> ret = wait_for_key_construction(key, false);
> if (ret < 0) {
> @@ -711,6 +709,7 @@ EXPORT_SYMBOL(request_key_with_auxdata);
> * @description: The searchable description of the key.
> * @net: The network namespace that is the key's domain of operation.
> * @callout_info: The data to pass to the instantiation upcall (or NULL).
> + * @acl: The ACL to attach if a new key is created.
> *
> * As for request_key() except that it does not add the returned key to a
> * keyring if found, new keys are always allocated in the user's quota, the
> @@ -723,7 +722,8 @@ EXPORT_SYMBOL(request_key_with_auxdata);
> struct key *request_key_net(struct key_type *type,
> const char *description,
> struct net *net,
> - const char *callout_info)
> + const char *callout_info,
> + struct key_acl *acl)
> {
> struct key *key;
> size_t callout_len = 0;
> @@ -733,7 +733,7 @@ struct key *request_key_net(struct key_type *type,
> callout_len = strlen(callout_info);
> key = request_key_and_link(type, description, net->key_domain,
> callout_info, callout_len,
> - NULL, NULL, KEY_ALLOC_IN_QUOTA);
> + NULL, acl, NULL, KEY_ALLOC_IN_QUOTA);
> if (!IS_ERR(key)) {
> ret = wait_for_key_construction(key, false);
> if (ret < 0) {
> diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
> index 726555a0639c..790c809844ac 100644
> --- a/security/keys/request_key_auth.c
> +++ b/security/keys/request_key_auth.c
> @@ -28,6 +28,17 @@ static void request_key_auth_revoke(struct key *);
> static void request_key_auth_destroy(struct key *);
> static long request_key_auth_read(const struct key *, char __user *, size_t);
>
> +static struct key_acl request_key_auth_acl = {
> + .usage = REFCOUNT_INIT(1),
> + .nr_ace = 2,
> + .possessor_viewable = true,
> + .aces = {
> + KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_SEARCH |
> + KEY_ACE_LINK),
> + KEY_OWNER_ACE(KEY_ACE_VIEW),
> + }
> +};
> +
> /*
> * The request-key authorisation key type definition.
> */
> @@ -208,8 +219,8 @@ struct key *request_key_auth_new(struct key *target, const char *op,
>
> authkey = key_alloc(&key_type_request_key_auth, desc,
> cred->fsuid, cred->fsgid, cred,
> - KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH | KEY_POS_LINK |
> - KEY_USR_VIEW, KEY_ALLOC_NOT_IN_QUOTA, NULL);
> + &request_key_auth_acl,
> + KEY_ALLOC_NOT_IN_QUOTA, NULL);
> if (IS_ERR(authkey)) {
> ret = PTR_ERR(authkey);
> goto error_free_rka;
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index fd845063b692..616b7c292eb6 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -6560,6 +6560,7 @@ static int selinux_key_permission(key_ref_t key_ref,
> {
> struct key *key;
> struct key_security_struct *ksec;
> + unsigned oldstyle_perm;
> u32 sid;
>
> /* if no specific permissions are requested, we skip the
> @@ -6568,13 +6569,26 @@ static int selinux_key_permission(key_ref_t key_ref,
> if (perm == 0)
> return 0;
>
> + oldstyle_perm = perm & (KEY_NEED_VIEW | KEY_NEED_READ | KEY_NEED_WRITE |
> + KEY_NEED_SEARCH | KEY_NEED_LINK);
> + if (perm & KEY_NEED_SETSEC)
> + oldstyle_perm |= OLD_KEY_NEED_SETATTR;
> + if (perm & KEY_NEED_INVAL)
> + oldstyle_perm |= KEY_NEED_SEARCH;
> + if (perm & KEY_NEED_REVOKE && !(perm & OLD_KEY_NEED_SETATTR))
> + oldstyle_perm |= KEY_NEED_WRITE;
> + if (perm & KEY_NEED_JOIN)
> + oldstyle_perm |= KEY_NEED_SEARCH;
> + if (perm & KEY_NEED_CLEAR)
> + oldstyle_perm |= KEY_NEED_WRITE;
> +
> sid = cred_sid(cred);
>
> key = key_ref_to_ptr(key_ref);
> ksec = key->security;
>
> return avc_has_perm(&selinux_state,
> - sid, ksec->sid, SECCLASS_KEY, perm, NULL);
> + sid, ksec->sid, SECCLASS_KEY, oldstyle_perm, NULL);

This might be ok temporarily for compatibility but we'll want to
ultimately define the new permissions in SELinux and switch over to
using them if a new policy capability bit is set to indicate that the
policy supports them. We should probably decouple the SELinux
permission bits from the KEY_NEED_* values and explicitly map them all
at the same time.

> }
>
> static int selinux_key_getsecurity(struct key *key, char **_buffer)
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index feaace1c24a2..c09133115769 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -4407,7 +4407,8 @@ static int smack_key_permission(key_ref_t key_ref,
> #endif
> if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW))
> request |= MAY_READ;
> - if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR))
> + if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETSEC |
> + KEY_NEED_INVAL | KEY_NEED_REVOKE | KEY_NEED_CLEAR))
> request |= MAY_WRITE;
> rc = smk_access(tkp, keyp->security, request, &ad);
> rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
>

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  Last update: 2019-02-15 18:39    [W:0.396 / U:39.624 seconds]
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