[Patch] tools/python/xen Flask MLS security label handling

[Patch] tools/python/xen Flask MLS security label handling

[Machon Gregory]

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Changed the way security labels are handled to allow domains to be
labeled with Flask MLS security labels.  Changed the error message
generated when an invalid context is submitted to be more useful.

Signed-off-by: Machon B. Gregory <mbgrego@tycho.ncsc.mil>
Signed-off-by: George S. Coker, II <gscoker@alpha.ncsc.mil>

---

tools/python/xen/util/xsm/flask/flask.py |    2 +-
tools/python/xen/xend/XendConfig.py      |    5 -----
tools/python/xen/xm/create.py            |   16 +++++-----------
3 files changed, 6 insertions(+), 17 deletions(-)

-- 
Machon Gregory
National Information Assurance Research Lab (NIARL)



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diff -r c5125c0ea051 tools/python/xen/util/xsm/flask/flask.py
--- a/tools/python/xen/util/xsm/flask/flask.py
+++ b/tools/python/xen/util/xsm/flask/flask.py
@@ -25,7 +25,7 @@
     try:
         return flask.flask_context_to_sid(label)
     except:
-        return ""
+       raise XSMError('Invalid context %s' % label)
 
 def parse_security_label(security_label):
     return security_label
diff -r c5125c0ea051 tools/python/xen/xend/XendConfig.py
--- a/tools/python/xen/xend/XendConfig.py
+++ b/tools/python/xen/xend/XendConfig.py
@@ -799,11 +799,6 @@
                 if not sxp.child_value(sxp_cfg, 'security_label'):
                     del cfg['security']
 
-            sec_lab = cfg['security_label'].split(":")
-            if len(sec_lab) != 3:
-                raise XendConfigError("Badly formatted security label: %s"
-                                      % cfg['security_label'])
-
         old_state = sxp.child_value(sxp_cfg, 'state')
         if old_state:
             for i in range(len(CONFIG_OLD_DOM_STATES)):
diff -r c5125c0ea051 tools/python/xen/xm/create.py
--- a/tools/python/xen/xm/create.py
+++ b/tools/python/xen/xm/create.py
@@ -1163,17 +1163,11 @@
     num = len(vals.access_control)
     if num == 1:
         access_control = (vals.access_control)[0]
-        d = {}
-        a = access_control.split(',')
-        if len(a) > 2:
-            err('Too many elements in access_control specifier: ' + access_control)
-        for b in a:
-            (k, v) = b.strip().split('=', 1)
-            k = k.strip()
-            v = v.strip()
-            if k not in ['policy','label']:
-                err('Invalid access_control specifier: ' + access_control)
-            d[k] = v
+        acc_re = 'policy=(?P<policy>.*),label=(?P<label>.*)'
+        acc_match = re.match(acc_re,access_control)
+        if acc_match == None:
+            err('Invalid access_control specifier: ' + access_control)
+        d = acc_match.groupdict();
         access_controls.append(d)
         vals.access_control = access_controls
     elif num > 1:

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