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-rw-r--r--security/keys/keyctl.c210
1 files changed, 137 insertions, 73 deletions
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index acc9c89e40a8..7c72baa02f2e 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -103,7 +103,7 @@ asmlinkage long sys_add_key(const char __user *_type,
}
/* find the target keyring (which must be writable) */
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error3;
@@ -185,7 +185,7 @@ asmlinkage long sys_request_key(const char __user *_type,
/* get the destination keyring if specified */
dest_ref = NULL;
if (destringid) {
- dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
+ dest_ref = lookup_user_key(destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@@ -235,7 +235,7 @@ long keyctl_get_keyring_ID(key_serial_t id, int create)
key_ref_t key_ref;
long ret;
- key_ref = lookup_user_key(NULL, id, create, 0, KEY_SEARCH);
+ key_ref = lookup_user_key(id, create, 0, KEY_SEARCH);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -308,7 +308,7 @@ long keyctl_update_key(key_serial_t id,
}
/* find the target key (which must be writable) */
- key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
+ key_ref = lookup_user_key(id, 0, 0, KEY_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -336,7 +336,7 @@ long keyctl_revoke_key(key_serial_t id)
key_ref_t key_ref;
long ret;
- key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
+ key_ref = lookup_user_key(id, 0, 0, KEY_WRITE);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -362,7 +362,7 @@ long keyctl_keyring_clear(key_serial_t ringid)
key_ref_t keyring_ref;
long ret;
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
@@ -388,13 +388,13 @@ 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(NULL, ringid, 1, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
}
- key_ref = lookup_user_key(NULL, id, 1, 0, KEY_LINK);
+ key_ref = lookup_user_key(id, 1, 0, KEY_LINK);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -422,13 +422,13 @@ 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(NULL, ringid, 0, 0, KEY_WRITE);
+ keyring_ref = lookup_user_key(ringid, 0, 0, KEY_WRITE);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error;
}
- key_ref = lookup_user_key(NULL, id, 0, 0, 0);
+ key_ref = lookup_user_key(id, 0, 0, 0);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error2;
@@ -464,7 +464,7 @@ long keyctl_describe_key(key_serial_t keyid,
char *tmpbuf;
long ret;
- key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
+ key_ref = lookup_user_key(keyid, 0, 1, KEY_VIEW);
if (IS_ERR(key_ref)) {
/* viewing a key under construction is permitted if we have the
* authorisation token handy */
@@ -472,7 +472,7 @@ long keyctl_describe_key(key_serial_t keyid,
instkey = key_get_instantiation_authkey(keyid);
if (!IS_ERR(instkey)) {
key_put(instkey);
- key_ref = lookup_user_key(NULL, keyid,
+ key_ref = lookup_user_key(keyid,
0, 1, 0);
if (!IS_ERR(key_ref))
goto okay;
@@ -557,7 +557,7 @@ long keyctl_keyring_search(key_serial_t ringid,
}
/* get the keyring at which to begin the search */
- keyring_ref = lookup_user_key(NULL, ringid, 0, 0, KEY_SEARCH);
+ keyring_ref = lookup_user_key(ringid, 0, 0, KEY_SEARCH);
if (IS_ERR(keyring_ref)) {
ret = PTR_ERR(keyring_ref);
goto error2;
@@ -566,7 +566,7 @@ long keyctl_keyring_search(key_serial_t ringid,
/* get the destination keyring if specified */
dest_ref = NULL;
if (destringid) {
- dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
+ dest_ref = lookup_user_key(destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest_ref)) {
ret = PTR_ERR(dest_ref);
goto error3;
@@ -636,7 +636,7 @@ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
long ret;
/* find the key first */
- key_ref = lookup_user_key(NULL, keyid, 0, 0, 0);
+ key_ref = lookup_user_key(keyid, 0, 0, 0);
if (IS_ERR(key_ref)) {
ret = -ENOKEY;
goto error;
@@ -699,7 +699,7 @@ long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid)
if (uid == (uid_t) -1 && gid == (gid_t) -1)
goto error;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -804,7 +804,7 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
goto error;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -817,7 +817,7 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
down_write(&key->sem);
/* if we're not the sysadmin, we can only change a key that we own */
- if (capable(CAP_SYS_ADMIN) || key->uid == current->fsuid) {
+ if (capable(CAP_SYS_ADMIN) || key->uid == current_fsuid()) {
key->perm = perm;
ret = 0;
}
@@ -829,6 +829,60 @@ error:
} /* end keyctl_setperm_key() */
+/*
+ * get the destination keyring for instantiation
+ */
+static long get_instantiation_keyring(key_serial_t ringid,
+ struct request_key_auth *rka,
+ struct key **_dest_keyring)
+{
+ key_ref_t dkref;
+
+ /* just return a NULL pointer if we weren't asked to make a link */
+ if (ringid == 0) {
+ *_dest_keyring = NULL;
+ return 0;
+ }
+
+ /* if a specific keyring is nominated by ID, then use that */
+ if (ringid > 0) {
+ dkref = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ if (IS_ERR(dkref))
+ return PTR_ERR(dkref);
+ *_dest_keyring = key_ref_to_ptr(dkref);
+ return 0;
+ }
+
+ if (ringid == KEY_SPEC_REQKEY_AUTH_KEY)
+ return -EINVAL;
+
+ /* otherwise specify the destination keyring recorded in the
+ * authorisation key (any KEY_SPEC_*_KEYRING) */
+ if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) {
+ *_dest_keyring = rka->dest_keyring;
+ return 0;
+ }
+
+ return -ENOKEY;
+}
+
+/*
+ * change the request_key authorisation key on the current process
+ */
+static int keyctl_change_reqkey_auth(struct key *key)
+{
+ struct cred *new;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ key_put(new->request_key_auth);
+ new->request_key_auth = key_get(key);
+
+ return commit_creds(new);
+}
+
/*****************************************************************************/
/*
* instantiate the key with the specified payload, and, if one is given, link
@@ -839,13 +893,15 @@ long keyctl_instantiate_key(key_serial_t id,
size_t plen,
key_serial_t ringid)
{
+ const struct cred *cred = current_cred();
struct request_key_auth *rka;
- struct key *instkey;
- key_ref_t keyring_ref;
+ struct key *instkey, *dest_keyring;
void *payload;
long ret;
bool vm = false;
+ kenter("%d,,%zu,%d", id, plen, ringid);
+
ret = -EINVAL;
if (plen > 1024 * 1024 - 1)
goto error;
@@ -853,7 +909,7 @@ long keyctl_instantiate_key(key_serial_t id,
/* the appropriate instantiation authorisation key must have been
* assumed before calling this */
ret = -EPERM;
- instkey = current->request_key_auth;
+ instkey = cred->request_key_auth;
if (!instkey)
goto error;
@@ -883,28 +939,20 @@ long keyctl_instantiate_key(key_serial_t id,
/* find the destination keyring amongst those belonging to the
* requesting task */
- keyring_ref = NULL;
- if (ringid) {
- keyring_ref = lookup_user_key(rka->context, ringid, 1, 0,
- KEY_WRITE);
- if (IS_ERR(keyring_ref)) {
- ret = PTR_ERR(keyring_ref);
- goto error2;
- }
- }
+ ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
+ if (ret < 0)
+ goto error2;
/* instantiate the key and link it into a keyring */
ret = key_instantiate_and_link(rka->target_key, payload, plen,
- key_ref_to_ptr(keyring_ref), instkey);
+ dest_keyring, instkey);
- key_ref_put(keyring_ref);
+ key_put(dest_keyring);
/* discard the assumed authority if it's just been disabled by
* instantiation of the key */
- if (ret == 0) {
- key_put(current->request_key_auth);
- current->request_key_auth = NULL;
- }
+ if (ret == 0)
+ keyctl_change_reqkey_auth(NULL);
error2:
if (!vm)
@@ -923,15 +971,17 @@ error:
*/
long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
{
+ const struct cred *cred = current_cred();
struct request_key_auth *rka;
- struct key *instkey;
- key_ref_t keyring_ref;
+ struct key *instkey, *dest_keyring;
long ret;
+ kenter("%d,%u,%d", id, timeout, ringid);
+
/* the appropriate instantiation authorisation key must have been
* assumed before calling this */
ret = -EPERM;
- instkey = current->request_key_auth;
+ instkey = cred->request_key_auth;
if (!instkey)
goto error;
@@ -941,27 +991,20 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
/* find the destination keyring if present (which must also be
* writable) */
- keyring_ref = NULL;
- if (ringid) {
- keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
- if (IS_ERR(keyring_ref)) {
- ret = PTR_ERR(keyring_ref);
- goto error;
- }
- }
+ ret = get_instantiation_keyring(ringid, rka, &dest_keyring);
+ if (ret < 0)
+ goto error;
/* instantiate the key and link it into a keyring */
ret = key_negate_and_link(rka->target_key, timeout,
- key_ref_to_ptr(keyring_ref), instkey);
+ dest_keyring, instkey);
- key_ref_put(keyring_ref);
+ key_put(dest_keyring);
/* discard the assumed authority if it's just been disabled by
* instantiation of the key */
- if (ret == 0) {
- key_put(current->request_key_auth);
- current->request_key_auth = NULL;
- }
+ if (ret == 0)
+ keyctl_change_reqkey_auth(NULL);
error:
return ret;
@@ -975,35 +1018,56 @@ error:
*/
long keyctl_set_reqkey_keyring(int reqkey_defl)
{
- int ret;
+ struct cred *new;
+ int ret, old_setting;
+
+ old_setting = current_cred_xxx(jit_keyring);
+
+ if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE)
+ return old_setting;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
switch (reqkey_defl) {
case KEY_REQKEY_DEFL_THREAD_KEYRING:
- ret = install_thread_keyring(current);
+ ret = install_thread_keyring_to_cred(new);
if (ret < 0)
- return ret;
+ goto error;
goto set;
case KEY_REQKEY_DEFL_PROCESS_KEYRING:
- ret = install_process_keyring(current);
- if (ret < 0)
- return ret;
+ ret = install_process_keyring_to_cred(new);
+ if (ret < 0) {
+ if (ret != -EEXIST)
+ goto error;
+ ret = 0;
+ }
+ goto set;
case KEY_REQKEY_DEFL_DEFAULT:
case KEY_REQKEY_DEFL_SESSION_KEYRING:
case KEY_REQKEY_DEFL_USER_KEYRING:
case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
- set:
- current->jit_keyring = reqkey_defl;
+ case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
+ goto set;
case KEY_REQKEY_DEFL_NO_CHANGE:
- return current->jit_keyring;
-
case KEY_REQKEY_DEFL_GROUP_KEYRING:
default:
- return -EINVAL;
+ ret = -EINVAL;
+ goto error;
}
+set:
+ new->jit_keyring = reqkey_defl;
+ commit_creds(new);
+ return old_setting;
+error:
+ abort_creds(new);
+ return -EINVAL;
+
} /* end keyctl_set_reqkey_keyring() */
/*****************************************************************************/
@@ -1018,7 +1082,7 @@ long keyctl_set_timeout(key_serial_t id, unsigned timeout)
time_t expiry;
long ret;
- key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+ key_ref = lookup_user_key(id, 1, 1, KEY_SETATTR);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
goto error;
@@ -1062,9 +1126,7 @@ long keyctl_assume_authority(key_serial_t id)
/* we divest ourselves of authority if given an ID of 0 */
if (id == 0) {
- key_put(current->request_key_auth);
- current->request_key_auth = NULL;
- ret = 0;
+ ret = keyctl_change_reqkey_auth(NULL);
goto error;
}
@@ -1079,10 +1141,12 @@ long keyctl_assume_authority(key_serial_t id)
goto error;
}
- key_put(current->request_key_auth);
- current->request_key_auth = authkey;
- ret = authkey->serial;
+ ret = keyctl_change_reqkey_auth(authkey);
+ if (ret < 0)
+ goto error;
+ key_put(authkey);
+ ret = authkey->serial;
error:
return ret;
@@ -1105,7 +1169,7 @@ long keyctl_get_security(key_serial_t keyid,
char *context;
long ret;
- key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
+ key_ref = lookup_user_key(keyid, 0, 1, KEY_VIEW);
if (IS_ERR(key_ref)) {
if (PTR_ERR(key_ref) != -EACCES)
return PTR_ERR(key_ref);
@@ -1117,7 +1181,7 @@ long keyctl_get_security(key_serial_t keyid,
return PTR_ERR(key_ref);
key_put(instkey);
- key_ref = lookup_user_key(NULL, keyid, 0, 1, 0);
+ key_ref = lookup_user_key(keyid, 0, 1, 0);
if (IS_ERR(key_ref))
return PTR_ERR(key_ref);
}