From: Tony Mack <tmack@cs.princeton.edu>
Date: Fri, 23 Oct 2009 00:09:54 +0000 (+0000)
Subject: checking this method back in. We missed you
X-Git-Tag: sfa-0.9-6~151
X-Git-Url: http://git.onelab.eu/?a=commitdiff_plain;h=135b6031efddad09d705e9b1013477e11facf105;p=sfa.git

checking this method back in. We missed you
---

diff --git a/sfa/methods/get_self_credential.py b/sfa/methods/get_self_credential.py
new file mode 100644
index 00000000..bccee168
--- /dev/null
+++ b/sfa/methods/get_self_credential.py
@@ -0,0 +1,99 @@
+### $Id: get_credential.py 15321 2009-10-15 05:01:21Z tmack $
+### $URL: https://svn.planet-lab.org/svn/sfa/trunk/sfa/methods/get_credential.py $
+
+from sfa.trust.credential import *
+from sfa.trust.rights import *
+from sfa.util.faults import *
+from sfa.util.method import Method
+from sfa.util.parameter import Parameter, Mixed
+from sfa.trust.auth import Auth
+from sfa.trust.gid import GID
+from sfa.util.record import GeniRecord
+from sfa.util.genitable import *
+from sfa.util.debug import log
+
+class get_self_credential(Method):
+    """
+    Retrive a credential for an object
+    @param cert certificate string 
+    @param type type of object (user | slice | sa | ma | node)
+    @param hrn human readable name of object
+
+    @return the string representation of a credential object  
+    """
+
+    interfaces = ['registry']
+    
+    accepts = [
+        Parameter(str, "certificate"),
+        Parameter(str, "Human readable name (hrn)"),
+        Parameter(str, "Request hash")
+        ]
+
+    returns = Parameter(str, "String representation of a credential object")
+
+    def call(self, cert, type, hrn, request_hash):
+        """
+        get_self_credential a degenerate version of get_credential used by a client
+        to get his initial credential when de doesnt have one. This is the same as
+        get_credetial(..., cred = None, ...)
+
+        The registry ensures that the client is the principal that is named by
+        (type, name) by comparing the public key in the record's  GID to the
+        private key used to encrypt the client side of the HTTPS connection. Thus
+        it is impossible for one principal to retrive another principal's
+        credential without having the appropriate private key.
+
+        @param type type of object (user | slice | sa | ma | node)
+        @param hrn human readable name of authority to list
+        @return string representation of a credential object
+        """
+        self.api.auth.verify_object_belongs_to_me(hrn)
+        auth_hrn = self.api.auth.get_authority(hrn)
+         
+        # if this is a root or sub authority get_authority will return
+        # an empty string
+        if not auth_hrn or hrn == self.api.config.SFA_INTERFACE_HRN:
+            auth_hrn = hrn
+
+        auth_info = self.api.auth.get_auth_info(auth_hrn)
+
+        # find a record that matches
+        record = None
+        table = GeniTable()
+        records = table.findObjects({'type': type, 'hrn':  hrn})
+        if not records:
+            raise RecordNotFound(hrn)
+        record = records[0]
+        
+        # get the right of this record    
+        rights = self.api.auth.determine_user_rights(None, record)
+        if rights.is_empty():
+            raise PermissionError(gid.get_hrn() + " has no rights to " + record.get_name())
+       
+        # authenticate the gid
+        gid = record.get_gid_object()
+        gid_str = gid.save_to_string(save_parents=True)
+        self.api.auth.authenticateGid(gid_str, [cert, type, hrn], request_hash)
+        
+        # authenticate the certificate
+        certificate = Certificate(string=cert)
+        if not certificate.is_pubkey(gid.get_pubkey()):
+            raise ConnectionKeyGIDMismatch(gid.get_subject())
+
+        # create the credential
+        gid = record.get_gid_object()
+        cred = Credential(subject = gid.get_subject())
+        cred.set_gid_caller(gid)
+        cred.set_gid_object(gid)
+        cred.set_issuer(key=auth_info.get_pkey_object(), subject=auth_hrn)
+        cred.set_pubkey(gid.get_pubkey())
+        cred.set_privileges(rights)
+        cred.set_delegate(True)
+
+        auth_kind = "authority,sa,ma"
+        cred.set_parent(self.api.auth.hierarchy.get_auth_cred(auth_hrn, kind=auth_kind))
+
+        cred.encode()
+        cred.sign()
+        return cred.save_to_string(save_parents=True)