selinux_restorecon(3) — Linux manual page


selinux_restorecon(3)     SELinux API documentation    selinux_restorecon(3)

NAME         top

       selinux_restorecon  -  restore  file(s) default SELinux security con‐

SYNOPSIS         top

       #include <selinux/restorecon.h>

       int selinux_restorecon(const char *pathname,
                              unsigned int restorecon_flags);

DESCRIPTION         top

       selinux_restorecon() restores file default security contexts on
       filesystems that support extended attributes (see xattr(7)), based

              pathname containing a directory or file to be relabeled.
              If this is a directory and the restorecon_flags
              SELINUX_RESTORECON_RECURSE has been set (for descending
              through directories), then selinux_restorecon() will write an
              SHA1 digest of specfile entries calculated by
              selabel_get_digests_all_partial_matches(3) to an extended
              attribute of security.sehash once the relabeling has been
              completed successfully (see the NOTES section for details).
              These digests will be checked should selinux_restorecon() be
              rerun with the restorecon_flags SELINUX_RESTORECON_RECURSE
              flag set. If any of the specfile entries had been updated, the
              digest will also be updated. However if the digest is the
              same, no relabeling checks will take place.
              The restorecon_flags that can be used to manage the usage of
              the SHA1 digest are:

              restorecon_flags contains the labeling option/rules as

                     SELINUX_RESTORECON_SKIP_DIGEST Do not check or update
                     any extended attribute security.sehash entries.

                     SELINUX_RESTORECON_IGNORE_DIGEST force the checking of
                     labels even if the stored SHA1 digest matches the
                     specfile entries SHA1 digest. The specfile entries
                     digest will be written to the security.sehash extended
                     attribute once relabeling has been completed
                     successfully provided the SELINUX_RESTORECON_NOCHANGE
                     flag has not been set.

                     SELINUX_RESTORECON_NOCHANGE don't change any file
                     labels (passive check) or update the digest in the
                     security.sehash extended attribute.

                     SELINUX_RESTORECON_SET_SPECFILE_CTX If set, reset the
                     files label to match the default specfile context.  If
                     not set only reset the files "type" component of the
                     context to match the default specfile context.

                     SELINUX_RESTORECON_RECURSE change file and directory
                     labels recursively (descend directories) and if
                     successful write an SHA1 digest of the specfile entries
                     to an extended attribute as described in the NOTES

                     SELINUX_RESTORECON_VERBOSE log file label changes.
                            Note that if SELINUX_RESTORECON_VERBOSE and
                            SELINUX_RESTORECON_PROGRESS flags are set, then
                            SELINUX_RESTORECON_PROGRESS will take

                     SELINUX_RESTORECON_PROGRESS show progress by outputting
                     the number of files in 1k blocks processed to stdout.
                     If the SELINUX_RESTORECON_MASS_RELABEL flag is also set
                     then the approximate percentage complete will be shown.

                     SELINUX_RESTORECON_MASS_RELABEL generally set when
                     relabeling the entire OS, that will then show the
                     approximate percentage complete. The
                     SELINUX_RESTORECON_PROGRESS flag must also be set.

                     SELINUX_RESTORECON_REALPATH convert passed-in pathname
                     to the canonical pathname using realpath(3).

                     SELINUX_RESTORECON_XDEV prevent descending into
                     directories that have a different device number than
                     the pathname entry from which the descent began.

                     SELINUX_RESTORECON_ADD_ASSOC attempt to add an
                     association between an inode and a specification. If
                     there is already an association for the inode and it
                     conflicts with the specification, then use the last
                     matching specification.

                     SELINUX_RESTORECON_ABORT_ON_ERROR abort on errors
                     during the file tree walk.

                     SELINUX_RESTORECON_SYSLOG_CHANGES log any label changes
                     to syslog(3).

                     SELINUX_RESTORECON_LOG_MATCHES log what specfile
                     context matched each file.

                     SELINUX_RESTORECON_IGNORE_NOENTRY ignore files that do
                     not exist.

                     SELINUX_RESTORECON_IGNORE_MOUNTS do not read
                     /proc/mounts to obtain a list of non-seclabel mounts to
                     be excluded from relabeling checks.
                     Setting SELINUX_RESTORECON_IGNORE_MOUNTS is useful
                     where there is a non-seclabel fs mounted with a
                     seclabel fs mounted on a directory below this.

                     SELINUX_RESTORECON_CONFLICT_ERROR to treat conflicting
                     specifications, such as where two hardlinks for the
                     same inode have different contexts, as errors.

              The behavior regarding the checking and updating of the SHA1
              digest described above is the default behavior. It is possible
              to change this by first calling selabel_open(3) and not
              enabling the SELABEL_OPT_DIGEST option, then calling
              selinux_restorecon_set_sehandle(3) to set the handle to be
              used by selinux_restorecon(3).

              If the pathname is a directory path, then it is possible to
              set directories to be excluded from the path by calling
              selinux_restorecon_set_exclude_list(3) with a NULL terminated
              list before calling selinux_restorecon(3).

              By default selinux_restorecon(3) reads /proc/mounts to obtain
              a list of non-seclabel mounts to be excluded from relabeling
              checks unless the SELINUX_RESTORECON_IGNORE_MOUNTS flag has
              been set.

RETURN VALUE         top

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

NOTES         top

       1.  To improve performance when relabeling file systems recursively
           (e.g. the restorecon_flags SELINUX_RESTORECON_RECURSE flag is
           set) selinux_restorecon() will write a calculated SHA1 digest of
           the specfile entries returned by
           selabel_get_digests_all_partial_matches(3) to an extended
           attribute named security.sehash for each directory in the
           pathname path.

       2.  To check the extended attribute entry use getfattr(1), for

                  getfattr -e hex -n security.sehash /

       3.  Should any of the specfile entries have changed, then when
           selinux_restorecon() is run again with the
           SELINUX_RESTORECON_RECURSE flag set, new SHA1 digests will be
           calculated and all files automatically relabeled depending on the
           settings of the SELINUX_RESTORECON_SET_SPECFILE_CTX flag
           (provided SELINUX_RESTORECON_NOCHANGE is not set).

       4.  /sys and in-memory filesystems do not support the security.sehash
           extended attribute and are automatically excluded from any
           relabeling checks.

       5.  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         top


COLOPHON         top

       This page is part of the selinux (Security-Enhanced Linux user-space
       libraries and tools) project.  Information about the project can be
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       ⟨⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨⟩ on 2020-11-01.  (At that
       time, the date of the most recent commit that was found in the repos‐
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Security Enhanced Linux          20 Oct 2015           selinux_restorecon(3)

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