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-rw-r--r--security/keys/keyctl.c204
1 files changed, 129 insertions, 75 deletions
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index dc0011b3fac9..a6516a64b297 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1,6 +1,6 @@
/* keyctl.c: userspace keyctl operations
*
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -49,6 +49,10 @@ asmlinkage long sys_add_key(const char __user *_type,
goto error;
type[31] = '\0';
+ ret = -EPERM;
+ if (type[0] == '.')
+ goto error;
+
ret = -EFAULT;
dlen = strnlen_user(_description, PAGE_SIZE - 1);
if (dlen <= 0)
@@ -82,7 +86,7 @@ asmlinkage long sys_add_key(const char __user *_type,
}
/* find the target keyring (which must be writable) */
- keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error3;
@@ -137,6 +141,10 @@ asmlinkage long sys_request_key(const char __user *_type,
goto error;
type[31] = '\0';
+ ret = -EPERM;
+ if (type[0] == '.')
+ goto error;
+
/* pull the description into kernel space */
ret = -EFAULT;
dlen = strnlen_user(_description, PAGE_SIZE - 1);
@@ -181,7 +189,7 @@ asmlinkage long sys_request_key(const char __user *_type,
/* get the destination keyring if specified */
dest = NULL;
if (destringid) {
- dest = lookup_user_key(destringid, 1, 0, KEY_WRITE);
+ dest = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest)) {
ret = PTR_ERR(dest);
goto error3;
@@ -196,23 +204,15 @@ asmlinkage long sys_request_key(const char __user *_type,
}
/* do the search */
- key = request_key(ktype, description, callout_info);
+ key = request_key_and_link(ktype, description, callout_info, dest);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error5;
}
- /* link the resulting key to the destination keyring */
- if (dest) {
- ret = key_link(dest, key);
- if (ret < 0)
- goto error6;
- }
-
ret = key->serial;
- error6:
- key_put(key);
+ key_put(key);
error5:
key_type_put(ktype);
error4:
@@ -237,7 +237,7 @@ long keyctl_get_keyring_ID(key_serial_t id, int create)
struct key *key;
long ret;
- key = lookup_user_key(id, create, 0, KEY_SEARCH);
+ key = lookup_user_key(NULL, id, create, 0, KEY_SEARCH);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
@@ -324,7 +324,7 @@ long keyctl_update_key(key_serial_t id,
}
/* find the target key (which must be writable) */
- key = lookup_user_key(id, 0, 0, KEY_WRITE);
+ key = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error2;
@@ -352,7 +352,7 @@ long keyctl_revoke_key(key_serial_t id)
struct key *key;
long ret;
- key = lookup_user_key(id, 0, 0, KEY_WRITE);
+ key = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
@@ -363,7 +363,7 @@ long keyctl_revoke_key(key_serial_t id)
key_put(key);
error:
- return 0;
+ return ret;
} /* end keyctl_revoke_key() */
@@ -378,7 +378,7 @@ long keyctl_keyring_clear(key_serial_t ringid)
struct key *keyring;
long ret;
- keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error;
@@ -404,13 +404,13 @@ long keyctl_keyring_link(key_serial_t id, key_serial_t ringid)
struct key *keyring, *key;
long ret;
- keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error;
}
- key = lookup_user_key(id, 1, 0, KEY_LINK);
+ key = lookup_user_key(NULL, id, 1, 0, KEY_LINK);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error2;
@@ -438,13 +438,13 @@ long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
struct key *keyring, *key;
long ret;
- keyring = lookup_user_key(ringid, 0, 0, KEY_WRITE);
+ keyring = lookup_user_key(NULL, ringid, 0, 0, KEY_WRITE);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error;
}
- key = lookup_user_key(id, 0, 0, 0);
+ key = lookup_user_key(NULL, id, 0, 0, 0);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error2;
@@ -475,16 +475,29 @@ long keyctl_describe_key(key_serial_t keyid,
char __user *buffer,
size_t buflen)
{
- struct key *key;
+ struct key *key, *instkey;
char *tmpbuf;
long ret;
- key = lookup_user_key(keyid, 0, 1, KEY_VIEW);
+ key = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW);
if (IS_ERR(key)) {
+ /* viewing a key under construction is permitted if we have the
+ * authorisation token handy */
+ if (PTR_ERR(key) == -EACCES) {
+ instkey = key_get_instantiation_authkey(keyid);
+ if (!IS_ERR(instkey)) {
+ key_put(instkey);
+ key = lookup_user_key(NULL, keyid, 0, 1, 0);
+ if (!IS_ERR(key))
+ goto okay;
+ }
+ }
+
ret = PTR_ERR(key);
goto error;
}
+okay:
/* calculate how much description we're going to return */
ret = -ENOMEM;
tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
@@ -568,7 +581,7 @@ long keyctl_keyring_search(key_serial_t ringid,
goto error2;
/* get the keyring at which to begin the search */
- keyring = lookup_user_key(ringid, 0, 0, KEY_SEARCH);
+ keyring = lookup_user_key(NULL, ringid, 0, 0, KEY_SEARCH);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;
@@ -577,7 +590,7 @@ long keyctl_keyring_search(key_serial_t ringid,
/* get the destination keyring if specified */
dest = NULL;
if (destringid) {
- dest = lookup_user_key(destringid, 1, 0, KEY_WRITE);
+ dest = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE);
if (IS_ERR(dest)) {
ret = PTR_ERR(dest);
goto error3;
@@ -656,24 +669,25 @@ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen)
long ret;
/* find the key first */
- key = lookup_user_key(keyid, 0, 0, 0);
+ key = lookup_user_key(NULL, keyid, 0, 0, 0);
if (!IS_ERR(key)) {
/* see if we can read it directly */
if (key_permission(key, KEY_READ))
goto can_read_key;
- /* can't; see if it's searchable from this process's
- * keyrings */
- ret = -ENOKEY;
- if (key_permission(key, KEY_SEARCH)) {
- /* okay - we do have search permission on the key
- * itself, but do we have the key? */
- skey = search_process_keyrings_aux(key->type, key,
- keyctl_read_key_same);
- if (!IS_ERR(skey))
- goto can_read_key2;
- }
-
+ /* we can't; see if it's searchable from this process's
+ * keyrings
+ * - we automatically take account of the fact that it may be
+ * dangling off an instantiation key
+ */
+ skey = search_process_keyrings(key->type, key,
+ keyctl_read_key_same, current);
+ if (!IS_ERR(skey))
+ goto can_read_key2;
+
+ ret = PTR_ERR(skey);
+ if (ret == -EAGAIN)
+ ret = -EACCES;
goto error2;
}
@@ -719,7 +733,7 @@ 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 = lookup_user_key(id, 1, 1, 0);
+ key = lookup_user_key(NULL, id, 1, 1, 0);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
@@ -728,7 +742,6 @@ long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid)
/* make the changes with the locks held to prevent chown/chown races */
ret = -EACCES;
down_write(&key->sem);
- write_lock(&key->lock);
if (!capable(CAP_SYS_ADMIN)) {
/* only the sysadmin can chown a key to some other UID */
@@ -755,7 +768,6 @@ long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid)
ret = 0;
no_access:
- write_unlock(&key->lock);
up_write(&key->sem);
key_put(key);
error:
@@ -778,32 +790,25 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
if (perm & ~(KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL))
goto error;
- key = lookup_user_key(id, 1, 1, 0);
+ key = lookup_user_key(NULL, id, 1, 1, 0);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
- /* make the changes with the locks held to prevent chown/chmod
- * races */
+ /* make the changes with the locks held to prevent chown/chmod races */
ret = -EACCES;
down_write(&key->sem);
- write_lock(&key->lock);
-
- /* if we're not the sysadmin, we can only chmod a key that we
- * own */
- if (!capable(CAP_SYS_ADMIN) && key->uid != current->fsuid)
- goto no_access;
- /* changing the permissions mask */
- key->perm = perm;
- ret = 0;
+ /* if we're not the sysadmin, we can only change a key that we own */
+ if (capable(CAP_SYS_ADMIN) || key->uid == current->fsuid) {
+ key->perm = perm;
+ ret = 0;
+ }
- no_access:
- write_unlock(&key->lock);
up_write(&key->sem);
key_put(key);
- error:
+error:
return ret;
} /* end keyctl_setperm_key() */
@@ -818,7 +823,8 @@ long keyctl_instantiate_key(key_serial_t id,
size_t plen,
key_serial_t ringid)
{
- struct key *key, *keyring;
+ struct request_key_auth *rka;
+ struct key *instkey, *keyring;
void *payload;
long ret;
@@ -840,18 +846,21 @@ long keyctl_instantiate_key(key_serial_t id,
goto error2;
}
- /* find the target key (which must be writable) */
- key = lookup_user_key(id, 0, 1, KEY_WRITE);
- if (IS_ERR(key)) {
- ret = PTR_ERR(key);
+ /* find the instantiation authorisation key */
+ instkey = key_get_instantiation_authkey(id);
+ if (IS_ERR(instkey)) {
+ ret = PTR_ERR(instkey);
goto error2;
}
- /* find the destination keyring if present (which must also be
- * writable) */
+ rka = instkey->payload.data;
+
+ /* find the destination keyring amongst those belonging to the
+ * requesting task */
keyring = NULL;
if (ringid) {
- keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ keyring = lookup_user_key(rka->context, ringid, 1, 0,
+ KEY_WRITE);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error3;
@@ -859,11 +868,12 @@ long keyctl_instantiate_key(key_serial_t id,
}
/* instantiate the key and link it into a keyring */
- ret = key_instantiate_and_link(key, payload, plen, keyring);
+ ret = key_instantiate_and_link(rka->target_key, payload, plen,
+ keyring, instkey);
key_put(keyring);
error3:
- key_put(key);
+ key_put(instkey);
error2:
kfree(payload);
error:
@@ -878,21 +888,24 @@ long keyctl_instantiate_key(key_serial_t id,
*/
long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
{
- struct key *key, *keyring;
+ struct request_key_auth *rka;
+ struct key *instkey, *keyring;
long ret;
- /* find the target key (which must be writable) */
- key = lookup_user_key(id, 0, 1, KEY_WRITE);
- if (IS_ERR(key)) {
- ret = PTR_ERR(key);
+ /* find the instantiation authorisation key */
+ instkey = key_get_instantiation_authkey(id);
+ if (IS_ERR(instkey)) {
+ ret = PTR_ERR(instkey);
goto error;
}
+ rka = instkey->payload.data;
+
/* find the destination keyring if present (which must also be
* writable) */
keyring = NULL;
if (ringid) {
- keyring = lookup_user_key(ringid, 1, 0, KEY_WRITE);
+ keyring = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;
@@ -900,11 +913,11 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
}
/* instantiate the key and link it into a keyring */
- ret = key_negate_and_link(key, timeout, keyring);
+ ret = key_negate_and_link(rka->target_key, timeout, keyring, instkey);
key_put(keyring);
error2:
- key_put(key);
+ key_put(instkey);
error:
return ret;
@@ -912,6 +925,44 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid)
/*****************************************************************************/
/*
+ * set the default keyring in which request_key() will cache keys
+ * - return the old setting
+ */
+long keyctl_set_reqkey_keyring(int reqkey_defl)
+{
+ int ret;
+
+ switch (reqkey_defl) {
+ case KEY_REQKEY_DEFL_THREAD_KEYRING:
+ ret = install_thread_keyring(current);
+ if (ret < 0)
+ return ret;
+ goto set;
+
+ case KEY_REQKEY_DEFL_PROCESS_KEYRING:
+ ret = install_process_keyring(current);
+ if (ret < 0)
+ return ret;
+
+ 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_NO_CHANGE:
+ return current->jit_keyring;
+
+ case KEY_REQKEY_DEFL_GROUP_KEYRING:
+ default:
+ return -EINVAL;
+ }
+
+} /* end keyctl_set_reqkey_keyring() */
+
+/*****************************************************************************/
+/*
* the key control system call
*/
asmlinkage long sys_keyctl(int option, unsigned long arg2, unsigned long arg3,
@@ -980,6 +1031,9 @@ asmlinkage long sys_keyctl(int option, unsigned long arg2, unsigned long arg3,
(unsigned) arg3,
(key_serial_t) arg4);
+ case KEYCTL_SET_REQKEY_KEYRING:
+ return keyctl_set_reqkey_keyring(arg2);
+
default:
return -EOPNOTSUPP;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 12:52:13 +0100