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str_to_label(3tsol)
Trusted Extensions Library Functions str_to_label(3TSOL)
NAME
str_to_label - parse human readable strings to label
SYNOPSIS
cc [flag...] file... -ltsol [library...]
#include <tsol/label.h>
int str_to_label(const char *string, m_label_t **label,
const m_label_type_t label_type, uint_t flags, int *error);
DESCRIPTION
The str_to_label() function is a simple function to parse human read‐
able strings into labels of the requested type.
The string argument is the string to parse. If string is the result of
a label_to_str() conversion of type M_INTERNAL, flags are ignored, and
any previously parsed label is replaced.
If *label is NULL, str_to_label() allocates resources for label and
initializes the label to the label_type that was requested before pars‐
ing string.
If *label is not NULL, the label is a pointer to a mandatory label that
is the result of a previously parsed label and label_type is ignored.
The type that is used for parsing is derived from label for any type-
sensitive operations.
If flags is L_MODIFY_EXISTING, the parsed string can be used to modify
this label. The modifications are specified using + or - characters
which indicate whether the classification or compartment should be
added or removed. The parsed string syntax is as follows:
[+][classification] [[+|-][compartment]]...
where brackets denote optional entries, ... denotes zero or more of the
proceeding bracketed entry can be specified with blanks preceding it.
Blanks, tabs, commas, and slashes are interchangeable, with multiples
allowed. Classifications and compartments themselves can contain
blanks. If the parsed string starts with a classification followed by a
+ or -, then the new classification is used, but the rest of the label
is retained and modified as specified in the parsed string.
If flags is L_NO_CORRECTION, the previously parsed label is replaced
and the parsing algorithm does not attempt to infer missing elements
from string to compose a valid label.
If flags is L_DEFAULT, the previously parsed label is replaced and the
parsing algorithm makes a best effort to imply a valid label from the
elements of string.
If flags contains L_CHECK_AR logically OR-ed with another value, the
resulting label will be checked to ensure that it is within the
"Accreditation Range" of the DIA encodings schema. This flag is inter‐
preted only for MAC_LABEL label types.
The caller is responsible for freeing the allocated resources by call‐
ing the m_label_free() function. label_type defines the type for a
newly allocated label. The label type can be:
MAC_LABEL The string should be translated as a Mandatory Access
Control (MAC) label.
USER_CLEAR The string should be translated as a label that repre‐
sents the least upper bound of the labels that the user
is allowed to access.
If error is NULL, do not return additional error information for EIN‐
VAL. The calling process must have mandatory read access to label and
human readable string. Or the calling process must have the
sys_trans_label privilege.
The manifest constants ADMIN_HIGH and ADMIN_LOW are the human readable
strings that correspond to the Trusted Extensions policy admin_high and
admin_low label values. See labels(7).
RETURN VALUES
Upon successful completion, the str_to_label() function returns 0. Oth‐
erwise, -1 is returned, errno is set to indicate the error, and error
provides additional information for EINVAL. Otherwise, error is a zero-
based index to the string parse failure point.
ERRORS
The str_to_label() function will fail if:
EINVAL Invalid parameter. M_BAD_STRING indicates that string could
not be parsed. M_BAD_LABEL indicates that the label passed
in was in error. M_OUTSIDE_AR indicates that the resulting
label is not within the "Accreditation Range" specified in
the DIA encodings schema.
ENOTSUP The system does not support label translations.
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:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee below.
Parsing types that are relative to Defense Intelligence Agency (DIA)
encodings schema are Standard. Standard is specified in label_encod‐
ings(5).
SEE ALSO
libtsol(3LIB), label_to_str(3TSOL), m_label(3TSOL), label_encodings(5),
attributes(7), labels(7)
WARNINGS
A number of the parsing rules rely on the DIA label encodings schema.
The rules might not be valid for other label schemata.
Oracle Solaris 11.4 18 Aug 2014 str_to_label(3TSOL)