25010febb3
Summary: - bound string operations - better detection of filesystem names - pawd call now gets the resolved directory in the rpc All our local changes have been submitted and incorporated.
307 lines
9.3 KiB
Plaintext
307 lines
9.3 KiB
Plaintext
.pl 10.0i
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.po 0
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.ll 8.5i
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.lt 8.5i
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.nr LL 8.5i
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.nr LT 8.5i
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.ds LF Johansson
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.ds RF [Page %]
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.ds CF
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.ds LH Internet draft
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.ds RH 30 March 1998
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.ds CH Berkeley AMD LDAP Schema
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.hy 0
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.ad l
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.in 0
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INTERNET-DRAFT Leif Johansson
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Intented Category: Experimental Stockholm University
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.ce
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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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.fi
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.in 3
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This memo describes a directory (LDAP or X.500) schema for storing
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amd (Berkely-style automounter) mount info maps. The schema is currently
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beeing supported by the (beta version of the) am-utils version 6 package
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[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
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choice of repository for amd mount map databases. All Object Identifiers
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in this document are prefixed by amdSchema-id to be assigned later. The
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relation between this schema and the automount schema elements in [HOWARD]
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are mostly superficial. The model for the elements in [HOWARD] was the SUN
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automounter which has quite a different syntax for mount maps. Furthermore
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the intended usage of this schema differs from that of [HOWARD] in many
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respects.
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3. DSA requirements
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Directory servers implementing this schema SHOULD maintain the
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modifyTimestamp operational attribute. If not the amdMapCacheTtl
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attribute SHOULD be set to 0 indicating to clients that caching of
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map entries SHOULD be turned off. Clients wishing to use the amdMap
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schema MAY use the modifyTimestamp information to set the ttl for
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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
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in BNF using 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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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 \":=\" printablestring
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X.500 servers or LDAPv3 servers (supporting the binary attribute
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option) may use 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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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
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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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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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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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}
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MAY CONTAIN { cn }
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DESCRIPTION
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"An entry of this object class describes mount
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information relative to a 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
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advertise exported filesystems. Therefore it is often desirable to limit
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access to entries carrying amd mount map information to those systems
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to which the corresponding 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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[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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.in 3
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.ti 0
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Author's Address
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.nf
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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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