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man pages section 3: Extended Library Functions, Volume 4

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Updated: Thursday, June 13, 2019
 
 

getuserrange(3TSOL)

Name

getuserrange - get the label range of a user

Synopsis

cc [flags...] file... -ltsol [library...]
#include <tsol/label.h>

m_range_t *getuserrange(const char *username);

Description

The getuserrange() function returns the label range of username. The lower bound in the range is used as the initial workspace label when a user logs into a multilevel desktop. The upper bound, or clearance, is used as an upper limit to the available labels that a user can assign to labeled workspaces.

The default value for a user's label range is specified in label_encodings(5). Overriding values for individual users are specified in user_attr(5).

If the labeld(8) service is enabled, the default value for a user's label range is specified in label_encodings(5). Otherwise, the default clearance is specified by the CLEARANCE property in policy.conf(5), which defaults to ADMIN_HIGH. Overriding values for individual users are specified in user_attr(5).

Return Values

The getuserrange() function returns NULL if the memory allocation fails. Otherwise, the function returns a structure which must be freed by the caller, as follows:

m_range_t  *range;
    ...
    m_label_free(range->lower_bound);
    m_label_free(range->upper_bound);
    free(range);

Errors

The getuserrange() function will fail if:

ENOMEM

The physical limits of the system are exceeded by size bytes of memory which cannot be allocated.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
See below.
MT-Level
MT-Safe

The getuserrange() function is Committed for systems that implement the Defense Intelligence Agency (DIA) MAC policy of label_encodings(5). Other policies might exist in a future release of Trusted Extensions that might make obsolete or supplement label_encodings.

See Also

free(3C), libtsol(3LIB), m_label_free(3TSOL), label_encodings(5), user_attr(5), attributes(7)