security.h

linux 内核源代码

 *	@len as input is the maximum length to copy to userspace provided
 *	by the caller.
 *	Return 0 if all is well, otherwise, typical getsockopt return
 *	values.
 * @socket_getpeersec_dgram:
 * 	This hook allows the security module to provide peer socket security
 * 	state for udp sockets on a per-packet basis to userspace via
 * 	getsockopt SO_GETPEERSEC.  The application must first have indicated
 * 	the IP_PASSSEC option via getsockopt.  It can then retrieve the
 * 	security state returned by this hook for a packet via the SCM_SECURITY
 * 	ancillary message type.
 * 	@skb is the skbuff for the packet being queried
 * 	@secdata is a pointer to a buffer in which to copy the security data
 * 	@seclen is the maximum length for @secdata
 * 	Return 0 on success, error on failure.
 * @sk_alloc_security:
 *      Allocate and attach a security structure to the sk->sk_security field,
 *      which is used to copy security attributes between local stream sockets.
 * @sk_free_security:
 *	Deallocate security structure.
 * @sk_clone_security:
 *	Clone/copy security structure.
 * @sk_getsecid:
 *	Retrieve the LSM-specific secid for the sock to enable caching of network
 *	authorizations.
 * @sock_graft:
 *	Sets the socket's isec sid to the sock's sid.
 * @inet_conn_request:
 *	Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
 * @inet_csk_clone:
 *	Sets the new child socket's sid to the openreq sid.
 * @inet_conn_established:
 *     Sets the connection's peersid to the secmark on skb.
 * @req_classify_flow:
 *	Sets the flow's sid to the openreq sid.
 *
 * Security hooks for XFRM operations.
 *
 * @xfrm_policy_alloc_security:
 *	@xp contains the xfrm_policy being added to Security Policy Database
 *	used by the XFRM system.
 *	@sec_ctx contains the security context information being provided by
 *	the user-level policy update program (e.g., setkey).
 *	Allocate a security structure to the xp->security field; the security
 *	field is initialized to NULL when the xfrm_policy is allocated.
 *	Return 0 if operation was successful (memory to allocate, legal context)
 * @xfrm_policy_clone_security:
 *	@old contains an existing xfrm_policy in the SPD.
 *	@new contains a new xfrm_policy being cloned from old.
 *	Allocate a security structure to the new->security field
 *	that contains the information from the old->security field.
 *	Return 0 if operation was successful (memory to allocate).
 * @xfrm_policy_free_security:
 *	@xp contains the xfrm_policy
 *	Deallocate xp->security.
 * @xfrm_policy_delete_security:
 *	@xp contains the xfrm_policy.
 *	Authorize deletion of xp->security.
 * @xfrm_state_alloc_security:
 *	@x contains the xfrm_state being added to the Security Association
 *	Database by the XFRM system.
 *	@sec_ctx contains the security context information being provided by
 *	the user-level SA generation program (e.g., setkey or racoon).
 *	@secid contains the secid from which to take the mls portion of the context.
 *	Allocate a security structure to the x->security field; the security
 *	field is initialized to NULL when the xfrm_state is allocated. Set the
 *	context to correspond to either sec_ctx or polsec, with the mls portion
 *	taken from secid in the latter case.
 *	Return 0 if operation was successful (memory to allocate, legal context).
 * @xfrm_state_free_security:
 *	@x contains the xfrm_state.
 *	Deallocate x->security.
 * @xfrm_state_delete_security:
 *	@x contains the xfrm_state.
 *	Authorize deletion of x->security.
 * @xfrm_policy_lookup:
 *	@xp contains the xfrm_policy for which the access control is being
 *	checked.
 *	@fl_secid contains the flow security label that is used to authorize
 *	access to the policy xp.
 *	@dir contains the direction of the flow (input or output).
 *	Check permission when a flow selects a xfrm_policy for processing
 *	XFRMs on a packet.  The hook is called when selecting either a
 *	per-socket policy or a generic xfrm policy.
 *	Return 0 if permission is granted, -ESRCH otherwise, or -errno
 *	on other errors.
 * @xfrm_state_pol_flow_match:
 *	@x contains the state to match.
 *	@xp contains the policy to check for a match.
 *	@fl contains the flow to check for a match.
 *	Return 1 if there is a match.
 * @xfrm_decode_session:
 *	@skb points to skb to decode.
 *	@secid points to the flow key secid to set.
 *	@ckall says if all xfrms used should be checked for same secid.
 *	Return 0 if ckall is zero or all xfrms used have the same secid.
 *
 * Security hooks affecting all Key Management operations
 *
 * @key_alloc:
 *	Permit allocation of a key and assign security data. Note that key does
 *	not have a serial number assigned at this point.
 *	@key points to the key.
 *	@flags is the allocation flags
 *	Return 0 if permission is granted, -ve error otherwise.
 * @key_free:
 *	Notification of destruction; free security data.
 *	@key points to the key.
 *	No return value.
 * @key_permission:
 *	See whether a specific operational right is granted to a process on a
 *      key.
 *	@key_ref refers to the key (key pointer + possession attribute bit).
 *	@context points to the process to provide the context against which to
 *       evaluate the security data on the key.
 *	@perm describes the combination of permissions required of this key.
 *	Return 1 if permission granted, 0 if permission denied and -ve it the
 *      normal permissions model should be effected.
 *
 * Security hooks affecting all System V IPC operations.
 *
 * @ipc_permission:
 *	Check permissions for access to IPC
 *	@ipcp contains the kernel IPC permission structure
 *	@flag contains the desired (requested) permission set
 *	Return 0 if permission is granted.
 *
 * Security hooks for individual messages held in System V IPC message queues
 * @msg_msg_alloc_security:
 *	Allocate and attach a security structure to the msg->security field.
 *	The security field is initialized to NULL when the structure is first
 *	created.
 *	@msg contains the message structure to be modified.
 *	Return 0 if operation was successful and permission is granted.
 * @msg_msg_free_security:
 *	Deallocate the security structure for this message.
 *	@msg contains the message structure to be modified.
 *
 * Security hooks for System V IPC Message Queues
 *
 * @msg_queue_alloc_security:
 *	Allocate and attach a security structure to the
 *	msq->q_perm.security field. The security field is initialized to
 *	NULL when the structure is first created.
 *	@msq contains the message queue structure to be modified.
 *	Return 0 if operation was successful and permission is granted.
 * @msg_queue_free_security:
 *	Deallocate security structure for this message queue.
 *	@msq contains the message queue structure to be modified.
 * @msg_queue_associate:
 *	Check permission when a message queue is requested through the
 *	msgget system call.  This hook is only called when returning the
 *	message queue identifier for an existing message queue, not when a
 *	new message queue is created.
 *	@msq contains the message queue to act upon.
 *	@msqflg contains the operation control flags.
 *	Return 0 if permission is granted.
 * @msg_queue_msgctl:
 *	Check permission when a message control operation specified by @cmd
 *	is to be performed on the message queue @msq.
 *	The @msq may be NULL, e.g. for IPC_INFO or MSG_INFO.
 *	@msq contains the message queue to act upon.  May be NULL.
 *	@cmd contains the operation to be performed.
 *	Return 0 if permission is granted.  
 * @msg_queue_msgsnd:
 *	Check permission before a message, @msg, is enqueued on the message
 *	queue, @msq.
 *	@msq contains the message queue to send message to.
 *	@msg contains the message to be enqueued.
 *	@msqflg contains operational flags.
 *	Return 0 if permission is granted.
 * @msg_queue_msgrcv:
 *	Check permission before a message, @msg, is removed from the message
 *	queue, @msq.  The @target task structure contains a pointer to the 
 *	process that will be receiving the message (not equal to the current 
 *	process when inline receives are being performed).
 *	@msq contains the message queue to retrieve message from.
 *	@msg contains the message destination.
 *	@target contains the task structure for recipient process.
 *	@type contains the type of message requested.
 *	@mode contains the operational flags.
 *	Return 0 if permission is granted.
 *
 * Security hooks for System V Shared Memory Segments
 *
 * @shm_alloc_security:
 *	Allocate and attach a security structure to the shp->shm_perm.security
 *	field.  The security field is initialized to NULL when the structure is
 *	first created.
 *	@shp contains the shared memory structure to be modified.
 *	Return 0 if operation was successful and permission is granted.
 * @shm_free_security:
 *	Deallocate the security struct for this memory segment.
 *	@shp contains the shared memory structure to be modified.
 * @shm_associate:
 *	Check permission when a shared memory region is requested through the
 *	shmget system call.  This hook is only called when returning the shared
 *	memory region identifier for an existing region, not when a new shared
 *	memory region is created.
 *	@shp contains the shared memory structure to be modified.
 *	@shmflg contains the operation control flags.
 *	Return 0 if permission is granted.
 * @shm_shmctl:
 *	Check permission when a shared memory control operation specified by
 *	@cmd is to be performed on the shared memory region @shp.
 *	The @shp may be NULL, e.g. for IPC_INFO or SHM_INFO.
 *	@shp contains shared memory structure to be modified.
 *	@cmd contains the operation to be performed.
 *	Return 0 if permission is granted.
 * @shm_shmat:
 *	Check permissions prior to allowing the shmat system call to attach the
 *	shared memory segment @shp to the data segment of the calling process.
 *	The attaching address is specified by @shmaddr.
 *	@shp contains the shared memory structure to be modified.
 *	@shmaddr contains the address to attach memory region to.
 *	@shmflg contains the operational flags.
 *	Return 0 if permission is granted.
 *
 * Security hooks for System V Semaphores
 *
 * @sem_alloc_security:
 *	Allocate and attach a security structure to the sma->sem_perm.security
 *	field.  The security field is initialized to NULL when the structure is
 *	first created.
 *	@sma contains the semaphore structure
 *	Return 0 if operation was successful and permission is granted.
 * @sem_free_security:
 *	deallocate security struct for this semaphore
 *	@sma contains the semaphore structure.
 * @sem_associate:
 *	Check permission when a semaphore is requested through the semget
 *	system call.  This hook is only called when returning the semaphore
 *	identifier for an existing semaphore, not when a new one must be
 *	created.
 *	@sma contains the semaphore structure.
 *	@semflg contains the operation control flags.
 *	Return 0 if permission is granted.
 * @sem_semctl:
 *	Check permission when a semaphore operation specified by @cmd is to be
 *	performed on the semaphore @sma.  The @sma may be NULL, e.g. for 
 *	IPC_INFO or SEM_INFO.
 *	@sma contains the semaphore structure.  May be NULL.
 *	@cmd contains the operation to be performed.
 *	Return 0 if permission is granted.
 * @sem_semop
 *	Check permissions before performing operations on members of the
 *	semaphore set @sma.  If the @alter flag is nonzero, the semaphore set 
 *      may be modified.
 *	@sma contains the semaphore structure.
 *	@sops contains the operations to perform.
 *	@nsops contains the number of operations to perform.
 *	@alter contains the flag indicating whether changes are to be made.
 *	Return 0 if permission is granted.
 *
 * @ptrace:
 *	Check permission before allowing the @parent process to trace the
 *	@child process.
 *	Security modules may also want to perform a process tracing check
 *	during an execve in the set_security or apply_creds hooks of
 *	binprm_security_ops if the process is being traced and its security
 *	attributes would be changed by the execve.
 *	@parent contains the task_struct structure for parent process.
 *	@child contains the task_struct structure for child process.
 *	Return 0 if permission is granted.
 * @capget:
 *	Get the @effective, @inheritable, and @permitted capability sets for
 *	the @target process.  The hook may also perform permission checking to
 *	determine if the current process is allowed to see the capability sets
 *	of the @target process.
 *	@target contains the task_struct structure for target process.
 *	@effective contains the effective capability set.
 *	@inheritable contains the inheritable capability set.
 *	@permitted contains the permitted capability set.
 *	Return 0 if the capability sets were successfully obtained.
 * @capset_check:
 *	Check permission before setting the @effective, @inheritable, and
 *	@permitted capability sets for the @target process.
 *	Caveat:  @target is also set to current if a set of processes is
 *	specified (i.e. all processes other than current and init or a
 *	particular process group).  Hence, the capset_set hook may need to
 *	revalidate permission to the actual target process.