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LSM: Introduce inode_getsecid and ipc_getsecid hooks

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Introduce inode_getsecid(inode, secid) and ipc_getsecid(ipcp, secid)
LSM hooks. These hooks will be used instead of similar exported
SELinux interfaces.

Let {inode,ipc,task}_getsecid hooks set the secid to 0 by default
if CONFIG_SECURITY is not defined or if the hook is set to
NULL (dummy). This is done to notify the caller that no valid
secid exists.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Acked-by: James Morris <jmorris@namei.org>
Reviewed-by: Paul Moore <paul.moore@hp.com>
This commit is contained in:
Ahmed S. Darwish 2008-03-01 21:51:09 +02:00 committed by James Morris
parent d1a4be630f
commit 8a076191f3
3 changed files with 54 additions and 2 deletions
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30
include/linux/security.h
View File

@ -468,6 +468,11 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @dentry is the dentry being changed.
* Return 0 on success. If error is returned, then the operation
* causing setuid bit removal is failed.
* @inode_getsecid:
* Get the secid associated with the node.
* @inode contains a pointer to the inode.
* @secid contains a pointer to the location where result will be saved.
* In case of failure, @secid will be set to zero.
*
* Security hooks for file operations
*
@ -636,6 +641,8 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @task_getsecid:
* Retrieve the security identifier of the process @p.
* @p contains the task_struct for the process and place is into @secid.
* In case of failure, @secid will be set to zero.
*
* @task_setgroups:
* Check permission before setting the supplementary group set of the
* current process.
@ -997,6 +1004,11 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @ipcp contains the kernel IPC permission structure
* @flag contains the desired (requested) permission set
* Return 0 if permission is granted.
* @ipc_getsecid:
* Get the secid associated with the ipc object.
* @ipcp contains the kernel IPC permission structure.
* @secid contains a pointer to the location where result will be saved.
* In case of failure, @secid will be set to zero.
*
* Security hooks for individual messages held in System V IPC message queues
* @msg_msg_alloc_security:
@ -1317,6 +1329,7 @@ struct security_operations {
int (*inode_getsecurity)(const struct inode *inode, const char *name, void **buffer, bool alloc);
int (*inode_setsecurity)(struct inode *inode, const char *name, const void *value, size_t size, int flags);
int (*inode_listsecurity)(struct inode *inode, char *buffer, size_t buffer_size);
void (*inode_getsecid)(const struct inode *inode, u32 *secid);
int (*file_permission) (struct file * file, int mask);
int (*file_alloc_security) (struct file * file);
@ -1369,6 +1382,7 @@ struct security_operations {
void (*task_to_inode)(struct task_struct *p, struct inode *inode);
int (*ipc_permission) (struct kern_ipc_perm * ipcp, short flag);
void (*ipc_getsecid) (struct kern_ipc_perm *ipcp, u32 *secid);
int (*msg_msg_alloc_security) (struct msg_msg * msg);
void (*msg_msg_free_security) (struct msg_msg * msg);
@ -1578,6 +1592,7 @@ int security_inode_killpriv(struct dentry *dentry);
int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size);
void security_inode_getsecid(const struct inode *inode, u32 *secid);
int security_file_permission(struct file *file, int mask);
int security_file_alloc(struct file *file);
void security_file_free(struct file *file);
@ -1622,6 +1637,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
void security_task_reparent_to_init(struct task_struct *p);
void security_task_to_inode(struct task_struct *p, struct inode *inode);
int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag);
void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid);
int security_msg_msg_alloc(struct msg_msg *msg);
void security_msg_msg_free(struct msg_msg *msg);
int security_msg_queue_alloc(struct msg_queue *msq);
@ -2022,6 +2038,11 @@ static inline int security_inode_listsecurity(struct inode *inode, char *buffer,
return 0;
}
static inline void security_inode_getsecid(const struct inode *inode, u32 *secid)
{
*secid = 0;
}
static inline int security_file_permission (struct file *file, int mask)
{
return 0;
@ -2137,7 +2158,9 @@ static inline int security_task_getsid (struct task_struct *p)
}
static inline void security_task_getsecid (struct task_struct *p, u32 *secid)
{ }
{
*secid = 0;
}
static inline int security_task_setgroups (struct group_info *group_info)
{
@ -2216,6 +2239,11 @@ static inline int security_ipc_permission (struct kern_ipc_perm *ipcp,
return 0;
}
static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
{
*secid = 0;
}
static inline int security_msg_msg_alloc (struct msg_msg * msg)
{
return 0;

16
security/dummy.c
View File

@ -424,6 +424,11 @@ static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t bu
return 0;
}
static void dummy_inode_getsecid(const struct inode *inode, u32 *secid)
{
*secid = 0;
}
static int dummy_file_permission (struct file *file, int mask)
{
return 0;
@ -542,7 +547,9 @@ static int dummy_task_getsid (struct task_struct *p)
}
static void dummy_task_getsecid (struct task_struct *p, u32 *secid)
{ }
{
*secid = 0;
}
static int dummy_task_setgroups (struct group_info *group_info)
{
@ -616,6 +623,11 @@ static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
return 0;
}
static void dummy_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
{
*secid = 0;
}
static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
{
return 0;
@ -1058,6 +1070,7 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, inode_getsecurity);
set_to_dummy_if_null(ops, inode_setsecurity);
set_to_dummy_if_null(ops, inode_listsecurity);
set_to_dummy_if_null(ops, inode_getsecid);
set_to_dummy_if_null(ops, file_permission);
set_to_dummy_if_null(ops, file_alloc_security);
set_to_dummy_if_null(ops, file_free_security);
@ -1094,6 +1107,7 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, task_reparent_to_init);
set_to_dummy_if_null(ops, task_to_inode);
set_to_dummy_if_null(ops, ipc_permission);
set_to_dummy_if_null(ops, ipc_getsecid);
set_to_dummy_if_null(ops, msg_msg_alloc_security);
set_to_dummy_if_null(ops, msg_msg_free_security);
set_to_dummy_if_null(ops, msg_queue_alloc_security);

10
security/security.c
View File

@ -523,6 +523,11 @@ int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer
return security_ops->inode_listsecurity(inode, buffer, buffer_size);
}
void security_inode_getsecid(const struct inode *inode, u32 *secid)
{
security_ops->inode_getsecid(inode, secid);
}
int security_file_permission(struct file *file, int mask)
{
return security_ops->file_permission(file, mask);
@ -712,6 +717,11 @@ int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
return security_ops->ipc_permission(ipcp, flag);
}
void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
{
security_ops->ipc_getsecid(ipcp, secid);
}
int security_msg_msg_alloc(struct msg_msg *msg)
{
return security_ops->msg_msg_alloc_security(msg);