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ds LF Johansson
ds RF [Page %]
ds CF
ds LH Internet draft
ds RH 30 March 1998
ds CH Berkeley AMD LDAP Schema
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INTERNET-DRAFT                                                         Leif Johansson
Intented Category: Experimental                                  Stockholm University



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A directory (X.500 and LDAPv3) schema for Berkely automounter


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1. Status of this Memo

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This memo describes a directory (LDAP or X.500) schema for storing
amd (Berkely-style automounter) mount info maps. The schema is currently
beeing supported by the (beta version of the) am-utils version 6 package
[AMUTILS].

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2. Overview and Rationale

Directory services such as X.500 [X500] or LDAP [RFC2251] are a natural
choice of repository for amd mount map databases. All Object Identifiers
in this document are prefixed by amdSchema-id to be assigned later. The
relation between this schema and the automount schema elements in [HOWARD]
are mostly superficial. The model for the elements in [HOWARD] was the SUN
automounter which has quite a different syntax for mount maps. Furthermore
the intended usage of this schema differs from that of [HOWARD] in many
respects.

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3. DSA requirements

Directory servers implementing this schema SHOULD maintain the
modifyTimestamp operational attribute. If not the amdMapCacheTtl
attribute SHOULD be set to 0 indicating to clients that caching of
map entries SHOULD be turned off. Clients wishing to use the amdMap
schema MAY use the modifyTimestamp information to set the ttl for
internal caching schemes. A value of 0 for the amdMapCacheTtl must
result in clients turning off any local caching.

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4. Syntax definitions

The following attribute syntax is defined in this document:

    amdlocationlist

This syntax represents a amd map value. This is the syntax expressed
in BNF using definitions from [RFC2252]:

    amdlocationlist      = amdlocationselection |
                           amdlocationlist whsp "||" whsp amdlocationselection

    amdlocationselection = amdlocation |
                           amdlocationselection whsp amdlocation

    amdlocation          = amdlocationinfo |
                           "-" amdlocationinfo |
                           "-"

    amdlocationinfo      = seloropt |
                           amdlocationinfo ";" seloropt |
                           ";"

    seloropt             = seletion |
                           optass

    selection            = keystring "==" printablestring
                           keystring "!=" printablestring

    optass               = keystring \":=\" printablestring

X.500 servers or LDAPv3 servers (supporting the binary attribute
option) may use the following syntax definition:

    AmdLocationList ::= SEQUENCE OF {
                           SEQUENCE OF {
                              location     AmdLocation
                           }
                        }

    AmdLocation     ::= SET OF {
                           CHOICE {
                              location     [0] AmdLocationInfo
                              notlocation  [1] AmdLocationInfo
                              not          [2] NULL
                           }
                        }

    AmdLocationInfo ::= SET OF {
                           CHOICE {
                              selection    [0] AmdSelection
                              option       [1] AmdOption
                           }
                        }

    AmdSelection    ::= CHOICE {
                           eq     [0] AttributeAndValue
                           ne     [1] AttributeAndValue
                        }

    AmdOption       ::= AttributeAndValue

    AttributeAndValue ::= SEQUENCE {
                             attribute     IA5String
                             value         IA5String
                          }

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5. Attribute types

The following attribute types are defined in this document:

    amdMapName
    amdMapCacheTtl
    amdMapEntry
    amdMapEntryKey
    amdMapEntryValue

    amdSchema-a OBJECT IDENTIFIER ::= { amdSchema-id 1 }

    amdMapName
       ATTRIBUTE ::= {
          WITH SYNTAX              IA5String
          EQUALITY MATCHING RULE   caseIgoreExactMatch
          --ID                     { amdSchema-a 1 }
          DESCRIPTION
           "This attribute is the symbolic and in the naming
            context unique name of an amd map. This corresponds
            in the case of a flat file database to the name of
            the file or the mount-point of the map."
       }


    amdMapCacheTtl
       ATTRIBUTE ::= {
          WITH SYNTAX              Integer
          EQUALITY MATCHING RULE   integerExactMatch
          --ID                     { amdSchema-a 2 }
          SINGLE VALUED
          DESCRIPTION
           "The maximum time-to-live for the entries in this
            map. After this many milliseconds the map has to
            be cleared from local caches and reloaded. A value
            of 0 disables caching."
       }

    amdMapEntry
       ATTRIBUTE ::= {
          WITH SYNTAX              DistinguishedName
          EQUALITY MATHCING RULE   dNCaseIgnoreExactMatch
          --ID                     { amdSchema-a 3 }
          DESCRIPTION
           "A multivalued attribute listing the distinguished
            names of the amdMapEntries making up this amdMap
            object."
       }

    amdMapEntryKey ::= {
       ATTRIBUTE ::= {
          WITH SYNTAX              IA5String
          EQUALITY MATCHING RULE   stringExactMatch
          --ID                     { amdSchema-a 4 }
          SINGLE VALUED
          DESCRIPTION
           "The value of this attribute is usually the name of
            a mountpoint for this amdMapEntry."
       }

    amdMapEntryValue ::= {
       ATTRIBUTE ::= {
          WITH SYNTAX              AmdLocationList
          --ID                     { amdSchema-a 5 }
          DESCRIPTION
           "This is the actual mount information for the amdMapEntry
            using the syntax described above."
       }

    amdMapEntryKey ::= {
       ATTRIBUTE ::= {
          WITH SYNTAX              IA5String
          EQUALITY MATCHING RULE   stringExactMatch
          --ID                     { amdSchema-a 4 }
          SINGLE VALUED
          DESCRIPTION
           "The value of this attribute is usually the name of
            a mountpoint for this amdMapEntry."
       }

    amdMapEntryValue ::= {
       ATTRIBUTE ::= {
          WITH SYNTAX              AmdLocationList
          --ID                     { amdSchema-a 5 }
          DESCRIPTION
           "This is the actual mount information for the amdMapEntry
            using the syntax described above."
       }

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6. Object classes

The following object classes are defined in this document:

         amdMap
         amdMapEntry

defined as follows:

         amdSchema-oc ::= { amdSchema-id 2 }

         amdMap OBJECT-CLASS ::= {
                   SUBCLASS OF            { top }
                   KIND                   auxiliary
                   --ID                   { amdSchema-oc 1 }
                   MAY CONTAIN            { amdMapCacheTtl , cn }
                   MUST CONTAIN           { amdMapName , amdMapEntry }
                }

         amdMapEntry OBJECT-CLASS ::= {
                        SUBCLASS OF       { top }
                        KIND              structural
                        --ID              { amdSchema-oc 2 }
                        MUST CONTAIN      {
                                            amdMapName ,
                                            amdEntryKey ,
                                            amdEntryValue ,
                                          }
                        MAY CONTAIN       { cn }
                        DESCRIPTION
                         "An entry of this object class describes mount
                          information relative to a certain amdMap entry"
                     }

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7. Examples



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8. Security Considerations

Due to the security problems posed by NFS care should be taken not to
advertise exported filesystems. Therefore it is often desirable to limit
access to entries carrying amd mount map information to those systems
to which the corresponding filesystems have been exported.

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9. References

  [AMUTILS]
       am-utils homepage: http://shekel.cs.columbia.edu/~erez/am-utils.html

  [RFC2251]
       M. Wahl, T. Howes, S. Kille, "Lightweight Directory Access
       Protocol (v3)", RFC 2251, December 1997.

  [RFC2252]
       M. Wahl, A. Coulbeck, T. Howes, S. Kille, "Lightweight Directory
       Access Protocol (v3): Attribute Syntax Definitions", RFC 2252,
       December 1997.

  [RFC2253]
       M. Wahl, S. Kille, T. Howes, "Lightweight Directory Access
       Protocol (v3): UTF-8 String Representation of Distinguished
       Names", RFC 2253, December 1997.

  [HOWARD]
       Luke Howard, "An Approach for Using LDAP as a Network
       Information Service", draft-howard-nis-schema-??.txt, Internet
       draft.

  [X500]
       ITU something or other.

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Author's Address

nf

Leif Johansson
Department of Mathematics
Stockholm University
S-106 91 Stockholm
        SWEDEN

Email: leifj AT matematik.su.se

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