selinux_restorecon_xattr

Section: SELinux API documentation (3)
Updated: 30 July 2016
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NAME

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.