selinux_restorecon_xattr (3) Linux Manual Page

selinux_restorecon_xattr – manage default security.sehash extended attribute entries added by

selinux_restorecon(3), setfiles(8) or restorecon(8).

Synopsis

#include <selinux/restorecon.h>
int selinux_restorecon_xattr(const char *pathname,

                             unsigned int xattr_flags,

                             struct dir_xattr ***xattr_list);

Description

selinux_restorecon_xattr() returns a linked list of dir_xattr structures containing information described below based on:

pathname containing a directory tree to be searched for security.sehash extended attribute entries. xattr_flags contains options as follows: SELINUX_RESTORECON_XATTR_RECURSE recursively descend directories. SELINUX_RESTORECON_XATTR_DELETE_NONMATCH_DIGESTS delete non-matching digests from each directory in pathname. SELINUX_RESTORECON_XATTR_DELETE_ALL_DIGESTS delete all digests from each directory in pathname. SELINUX_RESTORECON_XATTR_IGNORE_MOUNTS do not read /proc/mounts to obtain a list of non-seclabel mounts to be excluded from the search.
Setting SELINUX_RESTORECON_XATTR_IGNORE_MOUNTS is useful where there is a non-seclabel fs mounted with a seclabel fs mounted on a directory below this.

xattr_list is the returned pointer to a linked list of dir_xattr structures, each containing the following information:

struct dir_xattr {
    char *directory;
    char *digest; /* Printable hex encoded string */
    enum digest_result result;
    struct dir_xattr *next;
};

The result entry is enumerated as follows:

enum digest_result {
 MATCH = 0,
 NOMATCH,
 DELETED_MATCH,
 DELETED_NOMATCH,
 ERROR
};

xattr_list must be set to NULL before calling selinux_restorecon_xattr(3). The caller is responsible for freeing the returned xattr_list entries in the linked list.

See the NOTES section for more information.

Return Value

On success, zero is returned. On error, -1 is returned and errno is set appropriately.

Notes

1.

By default selinux_restorecon_xattr(3) will use the default set of specfiles described in files_contexts(5) to calculate the SHA1 digests to be used for comparison. To change this default behavior selabel_open(3) must be called specifying the required SELABEL_OPT_PATH and setting the SELABEL_OPT_DIGEST option to a non-NULL value. selinux_restorecon_set_sehandle(3) is then called to set the handle to be used by selinux_restorecon_xattr(3).

2.

By default selinux_restorecon_xattr(3) reads /proc/mounts to obtain a list of non-seclabel mounts to be excluded from searches unless the SELINUX_RESTORECON_XATTR_IGNORE_MOUNTS flag has been set.

3.

RAMFS and TMPFS filesystems do not support the security.sehash extended attribute and are automatically excluded from searches.

4.

By default stderr is used to log output messages and errors. This may be changed by calling selinux_set_callback(3) with the SELINUX_CB_LOG type option.

See Also

selinux_restorecon(3)
selinux_restorecon_set_sehandle(3),
selinux_restorecon_default_handle(3),
selinux_restorecon_set_exclude_list(3),
selinux_restorecon_set_alt_rootpath(3),
selinux_set_callback(3)