Changeset 78f2668

Timestamp:

Nov 30, 2010 10:48:51 AM (13 years ago)

Author:

Ted Faber <faber@…>

Branches:

axis_example, compt_changes, info-ops, master

Children:

822d31b

Parents:

027b87b

Message:

Move some functions from access to legacy_access. Rename functions so abac is the default

Location:

fedd/federation

Files:

• access.py (modified) (3 diffs)
• emulab_access.py (modified) (9 diffs)
• legacy_access.py (added)

fedd/federation/access.py

@@ -124 +124 @@
 
 
-    def read_access(self, config, access_obj=None):
-        """
-        Read an access DB with filename config  of the form:
-            (id, id, id) -> attribute, something
-        where the ids can be fedids, strings, or <any> or <none>, attribute is
-        the attribute to assign , and something is any set of charcters.  The
-        hash self.access is populated with mappings from those triples to the
-        results of access_obj being called on the remainder of the line (if
-        present).  If access_obj is not given, the string itself is entered in
-        the hash.  Additionally, a triple with <any> and <none> mapped to None
-        is entered in self.auth with the attribute given.
-
-        Parsing errors result in a self.parse_error exception being raised.
-        access_obj should throw that as well.
-        """
-        lineno=0
-        name_expr = "["+string.ascii_letters + string.digits + "\.\-_]+"
-        fedid_expr = "fedid:[" + string.hexdigits + "]+"
-        key_name = "(<ANY>|<NONE>|"+fedid_expr + "|"+ name_expr + ")"
-        access_re = re.compile('\('+key_name+'\s*,\s*'+key_name+'\s*,\s*'+
-                key_name+'\s*\)\s*->\s*([^,]+)\s*(.*)', re.IGNORECASE)
-
-        def parse_name(n):
-            if n.startswith('fedid:'): return fedid(hexstr=n[len('fedid:'):])
-            else: return n
-        
-        def auth_name(n):
-            if isinstance(n, basestring):
-                if n =='<any>' or n =='<none>': return None
-                else: return unicode(n)
-            else:
-                return n
-        def strip_comma(s):
-            s = s.strip()
-            if s.startswith(','):
-                s = s[1:].strip()
-            return s
-
-        if access_obj is None:
-            access_obj = lambda(x): "%s" % x
-
-        f = open(config, "r");
-        try:
-            for line in f:
-                lineno += 1
-                line = line.strip();
-                if len(line) == 0 or line.startswith('#'):
-                    continue
-
-                # Access line (t, p, u) -> anything
-                m = access_re.match(line)
-                if m != None:
-                    access_key = tuple([ parse_name(x) \
-                            for x in m.group(1,2,3)])
-                    attribute = m.group(4)
-                    auth_key = tuple([ auth_name(x) for x in access_key])
-                    self.auth.set_attribute(auth_key, attribute)
-                    if len(m.group(5)) > 0:
-                        access_val = access_obj(strip_comma(m.group(5)))
-                        self.access[access_key] = access_val
-                    continue
-
-                # Nothing matched to here: unknown line - raise exception
-                f.close()
-                raise self.parse_error(
-                        "Unknown statement at line %d of %s" % \
-                        (lineno, config))
-        finally:
-            if f: f.close()
-
-    def read_abac_access(self, fn, access_obj=None):
+    def read_access(self, fn, access_obj=None):
         """
         Read an access DB of the form
@@ -228 +158 @@
         finally:
             if f: f.close()
-
-
-    def get_users(self, obj):
-        """
-        Return a list of the IDs of the users in dict
-        """
-        if obj.has_key('user'):
-            return [ unpack_id(u['userID']) \
-                    for u in obj['user'] if u.has_key('userID') ]
-        else:
-            return None
 
     def write_state(self):
@@ -279 +198 @@
 
 
-
-    def permute_wildcards(self, a, p):
-        """Return a copy of a with various fields wildcarded.
-
-        The bits of p control the wildcards.  A set bit is a wildcard
-        replacement with the lowest bit being user then project then testbed.
-        """
-        if p & 1: user = ["<any>"]
-        else: user = a[2]
-        if p & 2: proj = "<any>"
-        else: proj = a[1]
-        if p & 4: tb = "<any>"
-        else: tb = a[0]
-
-        return (tb, proj, user)
-
-    def find_access(self, search):
-        """
-        Search the access DB for a match on this tuple.  Return the matching
-        access tuple and the user that matched.
-        
-        NB, if the initial tuple fails to match we start inserting wildcards in
-        an order determined by self.project_priority.  Try the list of users in
-        order (when wildcarded, there's only one user in the list).
-        """
-        if self.project_priority: perm = (0, 1, 2, 3, 4, 5, 6, 7)
-        else: perm = (0, 2, 1, 3, 4, 6, 5, 7)
-
-        for p in perm: 
-            s = self.permute_wildcards(search, p)
-            # s[2] is None on an anonymous, unwildcarded request
-            if s[2] != None:
-                for u in s[2]:
-                    if self.access.has_key((s[0], s[1], u)):
-                        return (self.access[(s[0], s[1], u)], u)
-            else:
-                if self.access.has_key(s):
-                    return (self.access[s], None)
-        return None, None
-
-    def lookup_access_base(self, req, fid):
-        """
-        Determine the allowed access for this request.  Return the access and
-        which fields are dynamic.
-
-        The fedid is needed to construct the request
-        """
-        user_re = re.compile("user:\s(.*)")
-        project_re = re.compile("project:\s(.*)")
-
-        # Search keys
-        tb = fid
-        user = [ user_re.findall(x)[0] for x in req.get('credential', []) \
-                if user_re.match(x)]
-        project = [ project_re.findall(x)[0] \
-                for x in req.get('credential', []) \
-                    if project_re.match(x)]
-
-        if len(project) == 1: project = project[0]
-        elif len(project) == 0: project = None
-        else: 
-            raise service_error(service_error.req, 
-                    "More than one project credential")
-
-        # Confirm authorization
-        for u in user:
-            self.log.debug("[lookup_access] Checking access for %s" % \
-                    ((tb, project, u),))
-            if self.auth.check_attribute((tb, project, u), 'access'):
-                self.log.debug("[lookup_access] Access granted")
-                break
-            else:
-                self.log.debug("[lookup_access] Access Denied")
-        else:
-            raise service_error(service_error.access, "Access denied")
-
-        # This maps a valid user to the Emulab projects and users to use
-        found, user_match = self.find_access((tb, project, user))
-
-        return (found, (tb, project, user_match))
-        
-
     def get_handler(self, path, fid):
+        """
+        This function is somewhat oddly named.  It doesn't get a handler, it
+        handles GETs.  Specifically, it handls https GETs for retrieving data
+        from the repository exported by the access server.
+        """
         self.log.info("Get handler %s %s" % (path, fid))
         if self.auth.check_attribute(fid, path) and self.userconfdir:

fedd/federation/emulab_access.py

@@ -16 +16 @@
 
 from access import access_base
+from legacy_access import legacy_access
 
 from util import *
@@ -41 +42 @@
 fl.addHandler(nullHandler())
 
-class access(access_base):
+class access(access_base, legacy_access):
     """
     The implementation of access control based on mapping users to projects.
@@ -119 +120 @@
         if self.auth_type == 'legacy':
             if accessdb:
-                self.read_access(accessdb, self.make_access_project)
+                self.legacy_read_access(accessdb, self.legacy_access_tuple)
         elif self.auth_type == 'abac':
             self.auth = abac_authorizer(load=self.auth_dir)
             if accessdb:
-                self.read_abac_access(accessdb, self.make_abac_access_project)
+                self.read_access(accessdb, self.access_tuple)
         else:
             raise service_error(service_error.internal, 
@@ -205 +206 @@
 
     @staticmethod
-    def make_access_project(str):
+    def legacy_access_tuple(str):
         """
         Convert a string of the form (id[:resources:resouces], id, id) into a
@@ -235 +236 @@
 
     @staticmethod
-    def make_abac_access_project(str):
+    def access_tuple(str):
         """
         Convert a string of the form (id, id) into an access_project.  This is
-        called by read_abac_access to convert to local attributes.  It returns
+        called by read_access to convert to local attributes.  It returns
         a tuple of the form (project, user, user) where the two users are
         always the same.
@@ -255 +256 @@
     # RequestAccess support routines
 
-    def lookup_access(self, req, fid):
+    def legacy_lookup_access(self, req, fid):
         """
         Look up the local access control information mapped to this fedid and
@@ -270 +271 @@
         ru = None
         # This maps a valid user to the Emulab projects and users to use
-        found, match = self.lookup_access_base(req, fid)
+        found, match = self.legacy_lookup_access_base(req, fid)
         tb, project, user = match
         
@@ -326 +327 @@
                 [ fid ]
 
-    def lookup_abac_access(self, req, fid): 
+    def lookup_access(self, req, fid): 
+        """
+        Check all the attributes that this controller knows how to map and see
+        if the requester is allowed to use any of them.  If so return one.
+        """
         # Import request credentials into this (clone later??)
-        if self.auth.import_credentials(data_list=req.get('abac_credential', [])):
+        if self.auth.import_credentials(
+                data_list=req.get('abac_credential', [])):
             self.auth.save()
 
         # Check every attribute that we know how to map and take the first
         # success.
-        print "%s" %self.auth
         for attr in (self.access.keys()):
             if self.auth.check_attribute(fid, attr):
@@ -491 +496 @@
 
         if self.auth_type == "legacy":
+            found, dyn, owners = self.legacy_lookup_access(req, fid)
+        elif self.auth_type == 'abac':
             found, dyn, owners = self.lookup_access(req, fid)
-        elif self.auth_type == 'abac':
-            found, dyn, owners = self.lookup_abac_access(req, fid)
         else:
             raise service_error(service_error.internal,