[PATCH] keys: Permit key expiry time to be set

Add a new keyctl function that allows the expiry time to be set on a key or
removed from a key, provided the caller has attribute modification access.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Alexander Zangerl <az@bond.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/Documentation/keys.txt b/Documentation/keys.txt
index 6304db5..c17c4ca 100644 (file)
--- a/Documentation/keys.txt
+++ b/Documentation/keys.txt
@@ -498,7 +498,7 @@ The keyctl syscall functions are:
      keyring is full, error ENFILE will result.
 
      The link procedure checks the nesting of the keyrings, returning ELOOP if
-     it appears to deep or EDEADLK if the link would introduce a cycle.
+     it appears too deep or EDEADLK if the link would introduce a cycle.
 
 
  (*) Unlink a key or keyring from another keyring:
@@ -628,6 +628,19 @@ The keyctl syscall functions are:
      there is one, otherwise the user default session keyring.
 
 
+ (*) Set the timeout on a key.
+
+       long keyctl(KEYCTL_SET_TIMEOUT, key_serial_t key, unsigned timeout);
+
+     This sets or clears the timeout on a key. The timeout can be 0 to clear
+     the timeout or a number of seconds to set the expiry time that far into
+     the future.
+
+     The process must have attribute modification access on a key to set its
+     timeout. Timeouts may not be set with this function on negative, revoked
+     or expired keys.
+
+
 ===============
 KERNEL SERVICES
 ===============

diff --git a/include/linux/keyctl.h b/include/linux/keyctl.h
index 8d7c59a..ec8f3d6 100644 (file)
--- a/include/linux/keyctl.h
+++ b/include/linux/keyctl.h
@@ -46,5 +46,6 @@
 #define KEYCTL_INSTANTIATE             12      /* instantiate a partially constructed key */
 #define KEYCTL_NEGATE                  13      /* negate a partially constructed key */
 #define KEYCTL_SET_REQKEY_KEYRING      14      /* set default request-key keyring */
+#define KEYCTL_SET_TIMEOUT             15      /* set key timeout */
 
 #endif /*  _LINUX_KEYCTL_H */

diff --git a/security/keys/compat.c b/security/keys/compat.c
index 3303673..e8e7ef4 100644 (file)
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -74,6 +74,9 @@ asmlinkage long compat_sys_keyctl(u32 option,
        case KEYCTL_SET_REQKEY_KEYRING:
                return keyctl_set_reqkey_keyring(arg2);
 
+       case KEYCTL_SET_TIMEOUT:
+               return keyctl_set_timeout(arg2, arg3);
+
        default:
                return -EOPNOTSUPP;
        }

diff --git a/security/keys/internal.h b/security/keys/internal.h
index 39cba97..51f37c0 100644 (file)
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -136,6 +136,7 @@ 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);
 extern long keyctl_set_reqkey_keyring(int);
+extern long keyctl_set_timeout(key_serial_t, unsigned);
 
 
 /*

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index b7a468f..299f0ae 100644 (file)
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -967,6 +967,46 @@ long keyctl_set_reqkey_keyring(int reqkey_defl)
 
 /*****************************************************************************/
 /*
+ * set or clear the timeout for a key
+ */
+long keyctl_set_timeout(key_serial_t id, unsigned timeout)
+{
+       struct timespec now;
+       struct key *key;
+       key_ref_t key_ref;
+       time_t expiry;
+       long ret;
+
+       key_ref = lookup_user_key(NULL, id, 1, 1, KEY_SETATTR);
+       if (IS_ERR(key_ref)) {
+               ret = PTR_ERR(key_ref);
+               goto error;
+       }
+
+       key = key_ref_to_ptr(key_ref);
+
+       /* make the changes with the locks held to prevent races */
+       down_write(&key->sem);
+
+       expiry = 0;
+       if (timeout > 0) {
+               now = current_kernel_time();
+               expiry = now.tv_sec + timeout;
+       }
+
+       key->expiry = expiry;
+
+       up_write(&key->sem);
+       key_put(key);
+
+       ret = 0;
+error:
+       return ret;
+
+} /* end keyctl_set_timeout() */
+
+/*****************************************************************************/
+/*
  * the key control system call
  */
 asmlinkage long sys_keyctl(int option, unsigned long arg2, unsigned long arg3,
@@ -1038,6 +1078,10 @@ asmlinkage long sys_keyctl(int option, unsigned long arg2, unsigned long arg3,
        case KEYCTL_SET_REQKEY_KEYRING:
                return keyctl_set_reqkey_keyring(arg2);
 
+       case KEYCTL_SET_TIMEOUT:
+               return keyctl_set_timeout((key_serial_t) arg2,
+                                         (unsigned) arg3);
+
        default:
                return -EOPNOTSUPP;
        }