selabel_open(3)

1selabel_open(3)            SELinux API documentation           selabel_open(3)
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NAME

6       selabel_open, selabel_close - userspace SELinux labeling interface
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SYNOPSIS

9       #include <selinux/selinux.h>
10       #include <selinux/label.h>
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12       struct selabel_handle *selabel_open(int backend,
13                                           const struct selinux_opt *options,
14                                           unsigned nopt);
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16       void selabel_close(struct selabel_handle *hnd);
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DESCRIPTION

19       selabel_open()  is  used to initialize a labeling handle to be used for
20       lookup operations.  The backend argument specifies which backend is  to
21       be opened; the list of current backends appears in BACKENDS below.
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23       The  options  argument  should  be  NULL  or  a  pointer to an array of
24       selinux_opt structures of length nopt:
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26              struct selinux_opt {
27                  int         type;
28                  const char  *value;
29              };
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31       The available option types are described in  GLOBAL  OPTIONS  below  as
32       well  as  in the documentation for each individual backend.  The return
33       value on success is a non-NULL value for use in subsequent label opera‐
34       tions.
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36       selabel_close()  terminates  use  of  a  handle,  freeing  any internal
37       resources associated with it.  After this call has been made, the  han‐
38       dle must not be used again.
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GLOBAL OPTIONS

41       Global  options  which may be passed to selabel_open() include the fol‐
42       lowing:
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44       SELABEL_OPT_UNUSED
45              The option with a type code of zero is a no-op.  Thus  an  array
46              of  options  may  be initizalized to zero and any untouched ele‐
47              ments will not cause an error.
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49       SELABEL_OPT_VALIDATE
50              A non-null value for this option enables context validation.  By
51              default,  security_check_context(3) is used; a custom validation
52              function can be provided via selinux_set_callback(3).  Note that
53              an  invalid  context may not be treated as an error unless it is
54              actually encountered during a lookup operation.
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56       SELABEL_OPT_DIGEST
57              A non-null value for this option enables the  generation  of  an
58              SHA1  digest  of  the  spec  files  loaded as described in sela‐
59              bel_digest(3)
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BACKENDS

62       SELABEL_CTX_FILE
63              File contexts backend, described in selabel_file(5).
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65       SELABEL_CTX_MEDIA
66              Media contexts backend, described in selabel_media(5).
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68       SELABEL_CTX_X
69              X Windows contexts backend, described in selabel_x(5).
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71       SELABEL_CTX_DB
72              Database objects contexts backend, described in selabel_db(5).
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RETURN VALUE

75       A non-NULL handle value is returned on  success.   On  error,  NULL  is
76       returned and errno is set appropriately.
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AUTHOR

79       Eamon Walsh <ewalsh@tycho.nsa.gov>
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