selabel_open.3 - Online Linux Manual Page

selabel_open - Online Linux Manual PageSection : 3
Updated : 18 Jun 2007
Source :
Note : SELinux API documentation

NAMEselabel_open, selabel_close − userspace SELinux labeling interface

SYNOPSIS#include <selinux/selinux.h>
#include <selinux/label.h> struct selabel_handle *selabel_open(unsigned int backend, const struct selinux_opt *options,
unsigned nopt); void selabel_close(struct selabel_handle *hnd);

DESCRIPTIONselabel_open() is used to initialize a labeling handle to be used for lookup operations. The backend argument specifies which backend is to be opened; the list of current backends appears in BACKENDS below. The options argument should be NULL or a pointer to an array of selinux_opt structures of length nopt: struct selinux_opt { int type; const char *value; };.ta The available option types are described in GLOBAL OPTIONS below as well as in the documentation for each individual backend. The return value on success is a non-NULL value for use in subsequent label operations. selabel_close() terminates use of a handle, freeing any internal resources associated with it. After this call has been made, the handle must not be used again.

GLOBAL OPTIONSGlobal options which may be passed to selabel_open() include the following: SELABEL_OPT_UNUSED The option with a type code of zero is a no-op. Thus an array of options may be initizalized to zero and any untouched elements will not cause an error. SELABEL_OPT_VALIDATE A non-null value for this option enables context validation. By default, security_check_context(3) is used; a custom validation function can be provided via selinux_set_callback(3). Note that an invalid context may not be treated as an error unless it is actually encountered during a lookup operation. SELABEL_OPT_DIGEST A non-null value for this option enables the generation of an SHA256 digest of the spec files loaded as described in selabel_digest(3)

BACKENDSSELABEL_CTX_FILE File contexts backend, described in selabel_file(5). SELABEL_CTX_MEDIA Media contexts backend, described in selabel_media(5). SELABEL_CTX_X X Windows contexts backend, described in selabel_x(5). SELABEL_CTX_DB Database objects contexts backend, described in selabel_db(5).

RETURN VALUEA non-NULL handle value is returned on success. On error, NULL is returned and errno is set appropriately.

AUTHOREamon Walsh <ewalsh@tycho.nsa.gov>

Johanes Gumabo

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