Figure out what realm an afs._pts.PTS instance authenticates against.

[invirt/packages/python-afs.git] / afs / _pts.pyx

diff --git a/afs/_pts.pyx b/afs/_pts.pyx
index ba3da9f..107bf85 100644 (file)
--- a/afs/_pts.pyx
+++ b/afs/_pts.pyx
@@ -1,4 +1,5 @@
 from afs cimport *
 from afs cimport *

+from afs import pyafs_error

 
 cdef import from "afs/ptuser.h":
     enum:
 
 cdef import from "afs/ptuser.h":
     enum:

@@ -7,6 +8,9 @@ cdef import from "afs/ptuser.h":
         PRUSERS
         PRGROUPS
         ANONYMOUSID
         PRUSERS
         PRGROUPS
         ANONYMOUSID

+        PR_SF_ALLBITS
+        PR_SF_NGROUPS
+        PR_SF_NUSERS

 
     ctypedef char prname[PR_MAXNAMELEN]
 
 
     ctypedef char prname[PR_MAXNAMELEN]
 

@@ -30,6 +34,7 @@ cdef import from "afs/ptuser.h":
         afs_int32 ngroups
         afs_int32 nusers
         afs_int32 count
         afs_int32 ngroups
         afs_int32 nusers
         afs_int32 count

+        char name[PR_MAXNAMELEN]

 
     struct prlistentries:
         afs_int32 flags
 
     struct prlistentries:
         afs_int32 flags

@@ -39,6 +44,7 @@ cdef import from "afs/ptuser.h":
         afs_int32 ngroups
         afs_int32 nusers
         afs_int32 count
         afs_int32 ngroups
         afs_int32 nusers
         afs_int32 count

+        char name[PR_MAXNAMELEN]

 
     struct prentries:
         unsigned int prentries_len
 
     struct prentries:
         unsigned int prentries_len

@@ -59,13 +65,32 @@ cdef import from "afs/ptuser.h":
     int ubik_PR_ListMax(ubik_client *, afs_int32, afs_int32 *, afs_int32 *)
     int ubik_PR_SetMax(ubik_client *, afs_int32, afs_int32, afs_int32)
     int ubik_PR_ListEntries(ubik_client *, afs_int32, afs_int32, afs_int32, prentries *, afs_int32 *)
     int ubik_PR_ListMax(ubik_client *, afs_int32, afs_int32 *, afs_int32 *)
     int ubik_PR_SetMax(ubik_client *, afs_int32, afs_int32, afs_int32)
     int ubik_PR_ListEntries(ubik_client *, afs_int32, afs_int32, afs_int32, prentries *, afs_int32 *)

+    int ubik_PR_SetFieldsEntry(ubik_client *, afs_int32, afs_int32, afs_int32, afs_int32, afs_int32, afs_int32, afs_int32, afs_int32)

 
 cdef import from "afs/pterror.h":
     enum:
         PRNOENT
 
 cdef import from "afs/pterror.h":
     enum:
         PRNOENT

-        PRTOOMANY

 
 

-    void initialize_PT_error_table()
+cdef import from "krb5/krb5.h":
+    struct _krb5_context:
+        pass
+    struct krb5_principal_data:
+        pass
+
+    ctypedef _krb5_context krb5_context
+    ctypedef krb5_principal_data * krb5_principal
+
+    ctypedef long krb5_int32
+    ctypedef krb5_int32 krb5_error_code
+    krb5_error_code krb5_init_context(krb5_context *)
+    krb5_error_code krb5_parse_name(krb5_context, char *, krb5_principal *)
+    krb5_error_code krb5_unparse_name(krb5_context, krb5_principal, char **)
+    krb5_error_code krb5_524_conv_principal(krb5_context, krb5_principal, char *, char *, char *)
+    krb5_error_code krb5_425_conv_principal(krb5_context, char *, char *, char *, krb5_principal *)
+    krb5_error_code krb5_get_host_realm(krb5_context, char *, char ***)
+    void krb5_free_host_realm(krb5_context, char **)
+    void krb5_free_principal(krb5_context, krb5_principal)
+    void krb5_free_context(krb5_context)

 
 cdef class PTEntry:
     cdef public afs_int32 flags
 
 cdef class PTEntry:
     cdef public afs_int32 flags

@@ -75,36 +100,15 @@ cdef class PTEntry:
     cdef public afs_int32 ngroups
     cdef public afs_int32 nusers
     cdef public afs_int32 count
     cdef public afs_int32 ngroups
     cdef public afs_int32 nusers
     cdef public afs_int32 count

+    cdef public object name

 
 

-cdef int _ptentry_from_checkentry(PTEntry p_entry, prcheckentry c_entry) except -1:
-    if p_entry is None:
-        raise TypeError
-        return -1
-
-    p_entry.flags = c_entry.flags
-    p_entry.id = c_entry.id
-    p_entry.owner = c_entry.owner
-    p_entry.creator = c_entry.creator
-    p_entry.ngroups = c_entry.ngroups
-    p_entry.nusers = c_entry.nusers
-    p_entry.count = c_entry.count
-    return 0
-
-cdef int _ptentry_to_checkentry(prcheckentry * c_entry, PTEntry p_entry) except -1:
-    if p_entry is None:
-        raise TypeError
-        return -1
-
-    c_entry.flags = p_entry.flags
-    c_entry.id = p_entry.id
-    c_entry.owner = p_entry.owner
-    c_entry.creator = p_entry.creator
-    c_entry.ngroups = p_entry.ngroups
-    c_entry.nusers = p_entry.nusers
-    c_entry.count = p_entry.count
-    return 0
+    def __repr__(self):
+        if self.name != '':
+            return '<PTEntry: %s>' % self.name
+        else:
+            return '<PTEntry: PTS ID %s>' % self.id

 
 

-cdef int _ptentry_from_listentry(PTEntry p_entry, prlistentries c_entry) except -1:
+cdef int _ptentry_from_c(PTEntry p_entry, prcheckentry * c_entry) except -1:

     if p_entry is None:
         raise TypeError
         return -1
     if p_entry is None:
         raise TypeError
         return -1

@@ -116,9 +120,10 @@ cdef int _ptentry_from_listentry(PTEntry p_entry, prlistentries c_entry) except
     p_entry.ngroups = c_entry.ngroups
     p_entry.nusers = c_entry.nusers
     p_entry.count = c_entry.count
     p_entry.ngroups = c_entry.ngroups
     p_entry.nusers = c_entry.nusers
     p_entry.count = c_entry.count

+    p_entry.name = c_entry.name

     return 0
 
     return 0
 

-cdef int _ptentry_to_listentry(prlistentries * c_entry, PTEntry p_entry) except -1:
+cdef int _ptentry_to_c(prcheckentry * c_entry, PTEntry p_entry) except -1:

     if p_entry is None:
         raise TypeError
         return -1
     if p_entry is None:
         raise TypeError
         return -1

@@ -130,6 +135,7 @@ cdef int _ptentry_to_listentry(prlistentries * c_entry, PTEntry p_entry) except
     c_entry.ngroups = p_entry.ngroups
     c_entry.nusers = p_entry.nusers
     c_entry.count = p_entry.count
     c_entry.ngroups = p_entry.ngroups
     c_entry.nusers = p_entry.nusers
     c_entry.count = p_entry.count

+    strncpy(c_entry.name, p_entry.name, sizeof(c_entry.name))

     return 0
 
 cdef class PTS:
     return 0
 
 cdef class PTS:

@@ -146,13 +152,20 @@ cdef class PTS:
       - 2: fail if an authenticated connection can't be established
       - 3: same as 2, plus encrypt all traffic to the protection
         server
       - 2: fail if an authenticated connection can't be established
       - 3: same as 2, plus encrypt all traffic to the protection
         server

+
+    The realm attribute is the Kerberos realm against which this cell
+    authenticates.

     """
     cdef ubik_client * client
     """
     cdef ubik_client * client

+    cdef readonly object cell
+    cdef readonly object realm

 
     def __cinit__(self, cell=None, sec=1):
         cdef afs_int32 code
         cdef afsconf_dir *cdir
         cdef afsconf_cell info
 
     def __cinit__(self, cell=None, sec=1):
         cdef afs_int32 code
         cdef afsconf_dir *cdir
         cdef afsconf_cell info

+        cdef krb5_context context
+        cdef char ** hrealms = NULL

         cdef char * c_cell
         cdef ktc_principal prin
         cdef ktc_token token
         cdef char * c_cell
         cdef ktc_principal prin
         cdef ktc_token token

@@ -179,8 +192,17 @@ cdef class PTS:
                           "Error opening configuration directory (%s): %s" % \
                               (AFSDIR_CLIENT_ETC_DIRPATH, strerror(errno)))
         code = afsconf_GetCellInfo(cdir, c_cell, "afsprot", &info)
                           "Error opening configuration directory (%s): %s" % \
                               (AFSDIR_CLIENT_ETC_DIRPATH, strerror(errno)))
         code = afsconf_GetCellInfo(cdir, c_cell, "afsprot", &info)

-        if code != 0:
-            raise Exception(code, "GetCellInfo: %s" % afs_error_message(code))
+        pyafs_error(code)
+
+        code = krb5_init_context(&context)
+        pyafs_error(code)
+        code = krb5_get_host_realm(context, info.hostName[0], &hrealms)
+        pyafs_error(code)
+        self.realm = hrealms[0]
+        krb5_free_host_realm(context, hrealms)
+        krb5_free_context(context)
+
+        self.cell = info.name

 
         if sec > 0:
             strncpy(prin.cell, info.name, sizeof(prin.cell))
 
         if sec > 0:
             strncpy(prin.cell, info.name, sizeof(prin.cell))

@@ -191,7 +213,7 @@ cdef class PTS:
             if code != 0:
                 if sec >= 2:
                     # No really - we wanted authentication
             if code != 0:
                 if sec >= 2:
                     # No really - we wanted authentication

-                    raise Exception(code, "Failed to get token for service AFS: %s" % afs_error_message(code))
+                    pyafs_error(code)

                 sec = 0
             else:
                 if sec == 3:
                 sec = 0
             else:
                 if sec == 3:

@@ -216,8 +238,7 @@ cdef class PTS:
                                               sec)
 
         code = ubik_ClientInit(serverconns, &self.client)
                                               sec)
 
         code = ubik_ClientInit(serverconns, &self.client)

-        if code != 0:
-            raise Exception("Failed to initialize ubik connection to Protection server: %s" % afs_error_message(code))
+        pyafs_error(code)

 
         code = rxs_Release(sc)
 
 
         code = rxs_Release(sc)
 

@@ -225,13 +246,24 @@ cdef class PTS:
         ubik_ClientDestroy(self.client)
         rx_Finalize()
 
         ubik_ClientDestroy(self.client)
         rx_Finalize()
 

-    def NameToId(self, name):
+    def _NameOrId(self, ident):
+        """
+        Given an identifier, convert it to a PTS ID by looking up the
+        name if it's a string, or otherwise just converting it to an
+        integer.
+        """
+        if isinstance(ident, basestring):
+            return self._NameToId(ident)
+        else:
+            return int(ident)
+
+    def _NameToId(self, name):

         """
         Converts a user or group to an AFS ID.
         """
         cdef namelist lnames
         cdef idlist lids
         """
         Converts a user or group to an AFS ID.
         """
         cdef namelist lnames
         cdef idlist lids

-        cdef afs_int32 code, id
+        cdef afs_int32 code, id = ANONYMOUSID

         name = name.lower()
 
         lids.idlist_len = 0
         name = name.lower()
 
         lids.idlist_len = 0

@@ -245,11 +277,10 @@ cdef class PTS:
             free(lids.idlist_val)
         if id == ANONYMOUSID:
             code = PRNOENT
             free(lids.idlist_val)
         if id == ANONYMOUSID:
             code = PRNOENT

-        if code != 0:
-            raise Exception("Failed to lookup PTS name: %s" % afs_error_message(code))
+        pyafs_error(code)

         return id
 
         return id
 

-    def IdToName(self, id):
+    def _IdToName(self, id):

         """
         Convert an AFS ID to the name of a user or group.
         """
         """
         Convert an AFS ID to the name of a user or group.
         """

@@ -271,11 +302,10 @@ cdef class PTS:
             free(lids.idlist_val)
         if name == str(id):
             code = PRNOENT
             free(lids.idlist_val)
         if name == str(id):
             code = PRNOENT

-        if code != 0:
-            raise Exception("Failed to lookup PTS ID: %s" % afs_error_message(code))
+        pyafs_error(code)

         return name
 
         return name
 

-    def CreateUser(self, name, id=None):
+    def _CreateUser(self, name, id=None):

         """
         Create a new user in the protection database. If an ID is
         provided, that one will be used.
         """
         Create a new user in the protection database. If an ID is
         provided, that one will be used.

@@ -292,11 +322,10 @@ cdef class PTS:
         else:
             code = ubik_PR_NewEntry(self.client, 0, name, 0, 0, &cid)
 
         else:
             code = ubik_PR_NewEntry(self.client, 0, name, 0, 0, &cid)
 

-        if code != 0:
-            raise Exception("Failed to create user: %s" % afs_error_message(code))
+        pyafs_error(code)

         return cid
 
         return cid
 

-    def CreateGroup(self, name, owner, id=None):
+    def _CreateGroup(self, name, owner, id=None):

         """
         Create a new group in the protection database. If an ID is
         provided, that one will be used.
         """
         Create a new group in the protection database. If an ID is
         provided, that one will be used.

@@ -304,7 +333,7 @@ cdef class PTS:
         cdef afs_int32 code, cid
 
         name = name[:PR_MAXNAMELEN].lower()
         cdef afs_int32 code, cid
 
         name = name[:PR_MAXNAMELEN].lower()

-        oid = self.NameToId(owner)
+        oid = self._NameOrId(owner)

 
         if id is not None:
             cid = id
 
         if id is not None:
             cid = id

@@ -312,49 +341,49 @@ cdef class PTS:
         else:
             code = ubik_PR_NewEntry(self.client, 0, name, PRGRP, oid, &cid)
 
         else:
             code = ubik_PR_NewEntry(self.client, 0, name, PRGRP, oid, &cid)
 

-        if code != 0:
-            raise Exception("Failed to create group: %s" % afs_error_message(code))
+        pyafs_error(code)

         return cid
 
         return cid
 

-    def Delete(self, id):
+    def _Delete(self, ident):

         """
         """

-        Delete the protection database entry with the provided ID.
+        Delete the protection database entry with the provided
+        identifier.

         """
         cdef afs_int32 code
         """
         cdef afs_int32 code

+        cdef afs_int32 id = self._NameOrId(ident)

 
         code = ubik_PR_Delete(self.client, 0, id)
 
         code = ubik_PR_Delete(self.client, 0, id)

-        if code != 0:
-            raise Exception("Failed to delete user: %s" % afs_error_message(code))
+        pyafs_error(code)

 
 

-    def AddToGroup(self, uid, gid):
+    def _AddToGroup(self, user, group):

         """
         """

-        Add the user with the given ID to the group with the given ID.
+        Add the given user to the given group.

         """
         cdef afs_int32 code
         """
         cdef afs_int32 code

+        cdef afs_int32 uid = self._NameOrId(user), gid = self._NameOrId(group)

 
         code = ubik_PR_AddToGroup(self.client, 0, uid, gid)
 
         code = ubik_PR_AddToGroup(self.client, 0, uid, gid)

-        if code != 0:
-            raise Exception("Failed to add user to group: %s" % afs_error_message(code))
+        pyafs_error(code)

 
 

-    def RemoveFromGroup(self, uid, gid):
+    def _RemoveFromGroup(self, user, group):

         """
         """

-        Remove the user with the given ID from the group with the given ID.
+        Remove the given user from the given group.

         """
         cdef afs_int32 code
         """
         cdef afs_int32 code

+        cdef afs_int32 uid = self._NameOrId(user), gid = self._NameOrId(group)

 
         code = ubik_PR_RemoveFromGroup(self.client, 0, uid, gid)
 
         code = ubik_PR_RemoveFromGroup(self.client, 0, uid, gid)

-        if code != 0:
-            raise Exception("Failed to remove user from group: %s" % afs_error_message(code))
+        pyafs_error(code)

 
 

-    def ListMembers(self, id):
+    def _ListMembers(self, ident):

         """
         Get the membership of an entity.
 
         """
         Get the membership of an entity.
 

-        If id is a group ID, this returns the users that are in that
+        If id is a group, this returns the users that are in that

         group.
 
         group.
 

-        If id is a user ID, this returns the list of groups that user
-        is on.
+        If id is a user, this returns the list of groups that user is
+        on.

 
         This returns a list of PTS IDs.
         """
 
         This returns a list of PTS IDs.
         """

@@ -363,6 +392,8 @@ cdef class PTS:
         cdef int i
         cdef object members = []
 
         cdef int i
         cdef object members = []
 

+        cdef afs_int32 id = self._NameOrId(ident)
+

         alist.prlist_len = 0
         alist.prlist_val = NULL
 
         alist.prlist_len = 0
         alist.prlist_val = NULL
 

@@ -373,14 +404,11 @@ cdef class PTS:
                 members.append(alist.prlist_val[i])
             free(alist.prlist_val)
 
                 members.append(alist.prlist_val[i])
             free(alist.prlist_val)
 

-        if over:
-            code = PRTOOMANY
-        if code != 0:
-            raise Exception("Failed to get group membership: %s" % afs_error_message(code))
+        pyafs_error(code)

 
         return members
 
 
         return members
 

-    def ListOwned(self, oid):
+    def _ListOwned(self, owner):

         """
         Get all groups owned by an entity.
         """
         """
         Get all groups owned by an entity.
         """

@@ -389,6 +417,8 @@ cdef class PTS:
         cdef int i
         cdef object owned = []
 
         cdef int i
         cdef object owned = []
 

+        cdef afs_int32 oid = self._NameOrId(owner)
+

         alist.prlist_len = 0
         alist.prlist_val = NULL
 
         alist.prlist_len = 0
         alist.prlist_val = NULL
 

@@ -399,30 +429,28 @@ cdef class PTS:
                 owned.append(alist.prlist_val[i])
             free(alist.prlist_val)
 
                 owned.append(alist.prlist_val[i])
             free(alist.prlist_val)
 

-        if over:
-            code = PRTOOMANY
-        if code != 0:
-            raise Exception("Failed to get owned entities: %s" % afs_error_message(code))
+        pyafs_error(code)

 
         return owned
 
 
         return owned
 

-    def ListEntry(self, id):
+    def _ListEntry(self, ident):

         """
         Load a PTEntry instance with information about the provided
         """
         Load a PTEntry instance with information about the provided

-        ID.
+        entity.

         """
         cdef afs_int32 code
         cdef prcheckentry centry
         cdef object entry = PTEntry()
 
         """
         cdef afs_int32 code
         cdef prcheckentry centry
         cdef object entry = PTEntry()
 

+        cdef afs_int32 id = self._NameOrId(ident)
+

         code = ubik_PR_ListEntry(self.client, 0, id, &centry)
         code = ubik_PR_ListEntry(self.client, 0, id, &centry)

-        if code != 0:
-            raise Exception("Error getting entity info: %s" % afs_error_message(code))
+        pyafs_error(code)

 
 

-        _ptentry_from_checkentry(entry, centry)
+        _ptentry_from_c(entry, &centry)

         return entry
 
         return entry
 

-    def ChangeEntry(self, id, newname=None, newid=None, newoid=None):
+    def _ChangeEntry(self, ident, newname=None, newid=None, newoid=None):

         """
         Change the name, ID, and/or owner of a PTS entity.
 
         """
         Change the name, ID, and/or owner of a PTS entity.
 

@@ -433,8 +461,10 @@ cdef class PTS:
         cdef afs_int32 c_newid = 0, c_newoid = 0
         cdef char * c_newname
 
         cdef afs_int32 c_newid = 0, c_newoid = 0
         cdef char * c_newname
 

+        cdef afs_int32 id = self._NameOrId(ident)
+

         if newname is None:
         if newname is None:

-            newname = self.IdToName(id)
+            newname = self._IdToName(id)

         c_newname = newname
         if newid is not None:
             c_newid = newid
         c_newname = newname
         if newid is not None:
             c_newid = newid

@@ -442,23 +472,23 @@ cdef class PTS:
             c_newoid = newoid
 
         code = ubik_PR_ChangeEntry(self.client, 0, id, c_newname, c_newoid, c_newid)
             c_newoid = newoid
 
         code = ubik_PR_ChangeEntry(self.client, 0, id, c_newname, c_newoid, c_newid)

-        if code != 0:
-            raise Exception("Error changing entity info: %s" % afs_error_message(code))
+        pyafs_error(code)

 
 

-    def IsAMemberOf(self, uid, gid):
+    def _IsAMemberOf(self, user, group):

         """
         """

-        Return True if the given uid is a member of the given gid.
+        Return True if the given user is a member of the given group.

         """
         cdef afs_int32 code
         cdef afs_int32 flag
 
         """
         cdef afs_int32 code
         cdef afs_int32 flag
 

+        cdef afs_int32 uid = self._NameOrId(user), gid = self._NameOrId(group)
+

         code = ubik_PR_IsAMemberOf(self.client, 0, uid, gid, &flag)
         code = ubik_PR_IsAMemberOf(self.client, 0, uid, gid, &flag)

-        if code != 0:
-            raise Exception("Error testing membership: %s" % afs_error_message(code))
+        pyafs_error(code)

 
         return bool(flag)
 
 
         return bool(flag)
 

-    def ListMax(self):
+    def _ListMax(self):

         """
         Return a tuple of the maximum user ID and the maximum group
         ID currently assigned.
         """
         Return a tuple of the maximum user ID and the maximum group
         ID currently assigned.

@@ -466,12 +496,11 @@ cdef class PTS:
         cdef afs_int32 code, uid, gid
 
         code = ubik_PR_ListMax(self.client, 0, &uid, &gid)
         cdef afs_int32 code, uid, gid
 
         code = ubik_PR_ListMax(self.client, 0, &uid, &gid)

-        if code != 0:
-            raise Exception("Error looking up max uid/gid: %s" % afs_error_message(code))
+        pyafs_error(code)

 
         return (uid, gid)
 
 
         return (uid, gid)
 

-    def SetMaxUserId(self, id):
+    def _SetMaxUserId(self, id):

         """
         Set the maximum currently assigned user ID (the next
         automatically assigned UID will be id + 1)
         """
         Set the maximum currently assigned user ID (the next
         automatically assigned UID will be id + 1)

@@ -479,10 +508,9 @@ cdef class PTS:
         cdef afs_int32 code
 
         code = ubik_PR_SetMax(self.client, 0, id, 0)
         cdef afs_int32 code
 
         code = ubik_PR_SetMax(self.client, 0, id, 0)

-        if code != 0:
-            raise Exception("Error setting max uid: %s" % afs_error_message(code))
+        pyafs_error(code)

 
 

-    def SetMaxGroupId(self, id):
+    def _SetMaxGroupId(self, id):

         """
         Set the maximum currently assigned user ID (the next
         automatically assigned UID will be id + 1)
         """
         Set the maximum currently assigned user ID (the next
         automatically assigned UID will be id + 1)

@@ -490,10 +518,9 @@ cdef class PTS:
         cdef afs_int32 code
 
         code = ubik_PR_SetMax(self.client, 0, id, PRGRP)
         cdef afs_int32 code
 
         code = ubik_PR_SetMax(self.client, 0, id, PRGRP)

-        if code != 0:
-            raise Exception("Error setting max gid: %s" % afs_error_message(code))
+        pyafs_error(code)

 
 

-    def ListEntries(self, users=None, groups=None):
+    def _ListEntries(self, users=None, groups=None):

         """
         Return a list of PTEntry instances representing all entries in
         the PRDB.
         """
         Return a list of PTEntry instances representing all entries in
         the PRDB.

@@ -522,12 +549,38 @@ cdef class PTS:
             if centries.prentries_val is not NULL:
                 for i in range(centries.prentries_len):
                     e = PTEntry()
             if centries.prentries_val is not NULL:
                 for i in range(centries.prentries_len):
                     e = PTEntry()

-                    _ptentry_from_listentry(e, centries.prentries_val[i])
+                    _ptentry_from_c(e, <prcheckentry *>&centries.prentries_val[i])

                     entries.append(e)
                 free(centries.prentries_val)
                     entries.append(e)
                 free(centries.prentries_val)

-            if code != 0:
-                raise Exception("Unable to list entries: %s" % afs_error_message(code))
+            pyafs_error(code)

 
             startindex = nextstartindex
 
         return entries
 
             startindex = nextstartindex
 
         return entries

+
+    def _SetFields(self, ident, access=None, groups=None, users=None):
+        """
+        Update the fields for an entry.
+
+        Valid fields are the privacy flags (access), the group quota
+        (groups), or the "foreign user quota" (users), which doesn't
+        actually seem to do anything, but is included for
+        completeness.
+        """
+        cdef afs_int32 code
+        cdef afs_int32 mask = 0, flags = 0, nusers = 0, ngroups = 0
+
+        cdef afs_int32 id = self._NameOrId(ident)
+
+        if access is not None:
+            flags = access
+            mask |= PR_SF_ALLBITS
+        if groups is not None:
+            ngroups = groups
+            mask |= PR_SF_NGROUPS
+        if users is not None:
+            nusers = users
+            mask |= PR_SF_NGROUPS
+
+        code = ubik_PR_SetFieldsEntry(self.client, 0, id, mask, flags, ngroups, nusers, 0, 0)
+        pyafs_error(code)