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361 lines
11 KiB
Plaintext
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INTERNET-DRAFT Leif Johansson
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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-
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style automounter) mount info maps. The schema is currently beeing supported by
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the (beta version of the) am-utils version 6 package [AMUTILS].
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2. Overview and Rationale
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Directory services such as X.500 [X500] or LDAP [RFC2251] are a natural choice of
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repository for amd mount map databases. All Object Identifiers in this document
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are prefixed by amdSchema-id to be assigned later. The relation between this
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schema and the automount schema elements in [HOWARD] are mostly superficial. The
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model for the elements in [HOWARD] was the SUN automounter which has quite a
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different syntax for mount maps. Furthermore the intended usage of this schema
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differs from that of [HOWARD] in many respects.
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3. DSA requirements
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Directory servers implementing this schema SHOULD maintain the modifyTimestamp
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operational attribute. If not the amdMapCacheTtl attribute SHOULD be set to 0
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indicating to clients that caching of map entries SHOULD be turned off. Clients
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wishing to use the amdMap schema MAY use the modifyTimestamp information to set
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the ttl for internal caching schemes. A value of 0 for the amdMapCacheTtl must
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result in clients turning off any local caching.
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4. Syntax definitions
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The following attribute syntax is defined in this document:
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amdlocationlist
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This syntax represents a amd map value. This is the syntax expressed in BNF using
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definitions from [RFC2252]:
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amdlocationlist = amdlocationselection |
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amdlocationlist whsp "||" whsp amdlocationselection
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amdlocationselection = amdlocation |
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amdlocationselection whsp amdlocation
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Johansson [Page 1]
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Internet draft Berkeley AMD LDAP Schema 30 March 1998
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amdlocation = amdlocationinfo |
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"-" amdlocationinfo |
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"-"
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amdlocationinfo = seloropt |
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amdlocationinfo ";" seloropt |
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";"
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seloropt = seletion |
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optass
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selection = keystring "==" printablestring
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keystring "!=" printablestring
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optass = keystring
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X.500 servers or LDAPv3 servers (supporting the binary attribute option) may use
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the following syntax definition:
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AmdLocationList ::= SEQUENCE OF {
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SEQUENCE OF {
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location AmdLocation
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}
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}
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AmdLocation ::= SET OF {
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CHOICE {
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location [0] AmdLocationInfo
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notlocation [1] AmdLocationInfo
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not [2] NULL
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}
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}
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AmdLocationInfo ::= SET OF {
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CHOICE {
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selection [0] AmdSelection
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option [1] AmdOption
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}
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}
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AmdSelection ::= CHOICE {
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eq [0] AttributeAndValue
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ne [1] AttributeAndValue
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}
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AmdOption ::= AttributeAndValue
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AttributeAndValue ::= SEQUENCE {
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attribute IA5String
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Johansson [Page 2]
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Internet draft Berkeley AMD LDAP Schema 30 March 1998
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value IA5String
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}
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5. Attribute types
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The following attribute types are defined in this document:
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amdMapName
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amdMapCacheTtl
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amdMapEntry
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amdMapEntryKey
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amdMapEntryValue
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amdSchema-a OBJECT IDENTIFIER ::= { amdSchema-id 1 }
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amdMapName ATTRIBUTE ::= {
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WITH SYNTAX IA5String
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EQUALITY MATCHING RULE caseIgoreExactMatch
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--ID { amdSchema-a 1 }
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DESCRIPTION
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"This attribute is the symbolic and in the naming
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context unique name of an amd map. This corresponds
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in the case of a flat file database to the name of
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the file or the mount-point of the map."
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}
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amdMapCacheTtl
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ATTRIBUTE ::= {
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WITH SYNTAX Integer
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EQUALITY MATCHING RULE integerExactMatch
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--ID { amdSchema-a 2 }
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SINGLE VALUED
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DESCRIPTION
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"The maximum time-to-live for the entries in this
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map. After this many milliseconds the map has to
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be cleared from local caches and reloaded. A value
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of 0 disables caching."
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}
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amdMapEntry
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ATTRIBUTE ::= {
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WITH SYNTAX DistinguishedName
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EQUALITY MATHCING RULE dNCaseIgnoreExactMatch
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--ID { amdSchema-a 3 }
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DESCRIPTION
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"A multivalued attribute listing the distinguished
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names of the amdMapEntries making up this amdMap
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Johansson [Page 3]
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Internet draft Berkeley AMD LDAP Schema 30 March 1998
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object."
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}
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amdMapEntryKey ::= {
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ATTRIBUTE ::= {
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WITH SYNTAX IA5String
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EQUALITY MATCHING RULE stringExactMatch
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--ID { amdSchema-a 4 }
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SINGLE VALUED
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DESCRIPTION
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"The value of this attribute is usually the name of
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a mountpoint for this amdMapEntry."
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}
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amdMapEntryValue ::= {
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ATTRIBUTE ::= {
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WITH SYNTAX AmdLocationList
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--ID { amdSchema-a 5 }
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DESCRIPTION
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"This is the actual mount information for the amdMapEntry
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using the syntax described above."
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}
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amdMapEntryKey ::= {
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ATTRIBUTE ::= {
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WITH SYNTAX IA5String
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EQUALITY MATCHING RULE stringExactMatch
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--ID { amdSchema-a 4 }
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SINGLE VALUED
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DESCRIPTION
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"The value of this attribute is usually the name of
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a mountpoint for this amdMapEntry."
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}
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amdMapEntryValue ::= {
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ATTRIBUTE ::= {
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WITH SYNTAX AmdLocationList
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--ID { amdSchema-a 5 }
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DESCRIPTION
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"This is the actual mount information for the amdMapEntry
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using the syntax described above."
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}
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6. Object classes
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The following object classes are defined in this document:
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amdMap
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Johansson [Page 4]
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Internet draft Berkeley AMD LDAP Schema 30 March 1998
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amdMapEntry
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defined as follows:
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amdSchema-oc ::= { amdSchema-id 2 }
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amdMap OBJECT-CLASS ::= {
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SUBCLASS OF { top }
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KIND auxiliary
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--ID { amdSchema-oc 1 }
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MAY CONTAIN { amdMapCacheTtl , cn }
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MUST CONTAIN { amdMapName , amdMapEntry }
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}
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amdMapEntry OBJECT-CLASS ::= {
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SUBCLASS OF { top }
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KIND structural
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--ID { amdSchema-oc 2 }
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MUST CONTAIN {
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amdMapName ,
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amdEntryKey ,
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amdEntryValue ,
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} MAY CONTAIN
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{ cn } DESCRIPTION "An entry of this
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object class describes mount information relative to a
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certain amdMap entry"
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}
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7. Examples
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8. Security Considerations
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Due to the security problems posed by NFS care should be taken not to advertise
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exported filesystems. Therefore it is often desirable to limit access to entries
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carrying amd mount map information to those systems to which the corresponding
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filesystems have been exported.
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9. References
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[AMUTILS]
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am-utils homepage: http://shekel.cs.columbia.edu/~erez/am-utils.html
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[RFC2251]
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M. Wahl, T. Howes, S. Kille, "Lightweight Directory Access
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Protocol (v3)", RFC 2251, December 1997.
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Johansson [Page 5]
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Internet draft Berkeley AMD LDAP Schema 30 March 1998
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[RFC2252]
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M. Wahl, A. Coulbeck, T. Howes, S. Kille, "Lightweight Directory
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Access Protocol (v3): Attribute Syntax Definitions", RFC 2252,
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December 1997.
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[RFC2253]
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M. Wahl, S. Kille, T. Howes, "Lightweight Directory Access
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Protocol (v3): UTF-8 String Representation of Distinguished
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Names", RFC 2253, December 1997.
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[HOWARD]
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Luke Howard, "An Approach for Using LDAP as a Network
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Information Service", draft-howard-nis-schema-??.txt, Internet
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draft.
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[X500]
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ITU something or other.
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Author's Address
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Leif Johansson
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Department of Mathematics
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Stockholm University
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S-106 91 Stockholm
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SWEDEN
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Email: leifj@matematik.su.se
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Johansson [Page 6]
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