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Net::DNS::SEC::Tools::keyrec.3pm

NAME

Net::DNS::SEC::Tools::keyrec - DNSSEC-Tools keyrec file operations

SYNOPSIS

   use Net::DNS::SEC::Tools::keyrec;
 
   keyrec_creat("localzone.keyrec");
   keyrec_open("localzone.keyrec");
   keyrec_read("localzone.keyrec");
 
   @krnames = keyrec_names();
 
   $krec = keyrec_fullrec("example.com");
   %keyhash = %$krec;
   $zname = $keyhash{"algorithm"};
 
   $val = keyrec_recval("example.com","zonefile");
 
   $exists = keyrec_exists("example.com");
 
   keyrec_add("zone","example.com",\%zone_krfields);
   keyrec_add("key","Kexample.com.+005+12345",\%keydata);
 
   keyrec_del("example.com");
   keyrec_del("Kexample.com.+005+12345");
 
   keyrec_setval("zone","example.com","zonefile","db.example.com");
 
   @kskpaths = keyrec_keypaths("example.com","kskcur");
 
   $obsflag = keyrec_revoke_check("Kexample.com.+005+12345");
 
   $setname = keyrec_signset_newname("example.com");
 
   keyrec_signset_new($zone,"example-set-21","zskcur");
 
   keyrec_signset_addkey("example-keys","Kexample.com+005+12345",
                                          "Kexample.com+005+54321");
   keyrec_signset_addkey("example-keys",@keylist);
 
   keyrec_signset_delkey("example-keys","Kexample.com+005+12345");
 
   $flag = keyrec_signset_haskey("example-keys","Kexample.com+005+12345");
 
   keyrec_signset_clear("example-keys","Kexample.com+005+12345");
 
   @signset = keyrec_signsets();
 
   keyrec_settime("zone","example.com");
   keyrec_settime("set","signing-set-42");
   keyrec_settime("key","Kexample.com.+005+76543");
 
   @keyfields = keyrec_keyfields();
   @zonefields = keyrec_zonefields();
 
   keyrec_write();
   keyrec_saveas("filecopy.krf);
   keyrec_close();
   keyrec_discard();
 
   $default_krf = keyrec_defkrf();
 
 

DESCRIPTION

The Net::DNS::SEC::Tools::keyrec module manipulates the contents of a DNSSEC-Tools keyrec file. keyrec files contain data about zones signed by and keys generated by the DNSSEC-Tools programs. Module interfaces exist for looking up keyrec records, creating new records, and modifying existing records.

A keyrec file is organized in sets of keyrec records. Each keyrec must be either of key type or zone type. Key keyrecs describe how encryption keys were generated, zone keyrecs describe how zones were signed. A keyrec consists of a set of keyword/value entries. The following is an example of a key keyrec:

     key     "Kexample.com.+005+30485"
           zonename        "example.com"
           keyrec_type     "kskcur"
           algorithm       "rsasha1"
           random          "/dev/urandom"
           ksklength       "2048"
           ksklife         "15768000"
           revperiod       "3888000"
           revtime         "1103277532"
           keyrec_gensecs  "1101183727"
           keyrec_gendate  "Tue Nov 23 04:22:07 2004"
 
 

The first step in using this module must be to create a new keyrec file or open and read an existing one. The keyrec_creat() interface creates a keyrec file if it does not exist and opens it. The keyrec_open() interface opens an existing keyrec file. The keyrec_read() interface reads the file and parses it into an internal format. The file's records are copied into a hash table (for easy reference by the Net::DNS::SEC::Tools::keyrec routines) and in an array (for preserving formatting and comments.)

After the file has been read, the contents are referenced using keyrec_fullrec() and keyrec_recval(). The keyrec contents are modified using keyrec_add(), and keyrec_setval(). keyrec_settime() will update a keyrec's timestamp to the current time. keyrecs may be deleted with the keyrec_del() interface.

If the keyrec file has been modified, it must be explicitly written or the changes are not saved. keyrec_write() saves the new contents to disk. keyrec_saveas() saves the in-memory keyrec contents to the specified file name, without affecting the original file.

keyrec_close() saves the file and close the Perl file handle to the keyrec file. If a keyrec file is no longer wanted to be open, yet the contents should not be saved, keyrec_discard() gets rid of the data, and closes the file handle without saving any modified data.

KEYREC INTERFACES

The interfaces to the Net::DNS::SEC::Tools::keyrec module are given below.

keyrec_add(keyrec_type,keyrec_name,fields)

This routine adds a new keyrec to the keyrec file and the internal representation of the file contents. The keyrec is added to both the %keyrecs hash table and the @keyreclines array.

keyrec_type specifies the type of the keyrec --- ``key'' or ``zone''. keyrec_name is the name of the keyrec. fields is a reference to a hash table that contains the name/value keyrec fields. The keys of the hash table are always converted to lowercase, but the entry values are left as given.

The ksklength entry is only added if the value of the keyrec_type field is ``kskcur''.

The zsklength entry is only added if the value of the keyrec_type field is ``zsk'', ``zskcur'', ``zskpub'', or ``zsknew''.

Timestamp fields are added at the end of the keyrec. For key keyrecs, the keyrec_gensecs and keyrec_gendate timestamp fields are added. For zone keyrecs, the keyrec_signsecs and keyrec_signdate timestamp fields are added.

If a specified field isn't defined for the keyrec type, the entry isn't added. This prevents zone keyrec data from getting mingled with key keyrec data.

A blank line is added after the final line of the new keyrec. After adding all new keyrec entries, the keyrec file is written but is not closed.

Return values are:

     0 success
     -1 invalid I<krtype>
 
 

keyrec_close()

This interface saves the internal version of the keyrec file (opened with keyrec_creat(), keyrec_open() or keyrec_read()) and closes the file handle.

keyrec_creat(keyrec_file)

This interface creates a keyrec file if it does not exist, and truncates the file if it already exists. It leaves the file in the open state.

keyrec_creat() returns 1 if the file was created successfully. It returns 0 if there was an error in creating the file.

keyrec_defkrf()

This routine returns the default keyrec filename from the DNSSEC-Tools configuration file.

keyrec_del(keyrec_name)

This routine deletes a keyrec from the keyrec file and the internal representation of the file contents. The keyrec is deleted from both the %keyrecs hash table and the @keyreclines array.

Only the keyrec itself is deleted from the file. Any associated comments and blank lines surrounding it are left intact.

Return values are:

     0 successful I<keyrec> deletion
     -1 invalid I<krtype> (empty string or unknown name)
 
 

keyrec_discard()

This routine removes a keyrec file from use by a program. The internally stored data are deleted and the keyrec file handle is closed. However, modified data are not saved prior to closing the file handle. Thus, modified and new data will be lost.

keyrec_exists(keyrec_name)

keyrec_exists() returns a boolean indicating if a keyrec exists that has the specified keyrec_name.

keyrec_fullrec(keyrec_name)

keyrec_fullrec() returns a reference to the keyrec specified in keyrec_name.

keyrec_keyfields()

This routine returns a list of the recognized fields for a key keyrec.

keyrec_keypaths(zonename,keytype)

keyrec_keypaths() returns a list of paths to a set of key files for a given zone. The zone is specified in zonename and the type of key is given in keytype.

keytype must be one of the following: ``kskcur'', ``kskpub'', ``kskrev'', ``kskobs''``, ''zskcur``, ''zskpub``, ''zsknew``, or ''zskobs".

If the given key type is not defined in the given zone's zone keyrec, then a null set is returned.

keyrec_names()

This routine returns a list of the keyrec names from the file.

keyrec_open(keyrec_file)

This interface opens an existing keyrec file. It first attempts to open the keyrec file for reading and writing. If this fails, then it attempts to open it read-only.

keyrec_open() returns 1 if the file was opened successfully. It returns 0 if the file does not exists or if there was an error in opening the file.

keyrec_read(keyrec_file)

This interface reads the specified keyrec file and parses it into a keyrec hash table and a file contents array. keyrec_read() must be called prior to any of the other Net::DNS::SEC::Tools::keyrec calls. If another keyrec is already open, then it is saved and closed prior to opening the new keyrec.

Upon success, keyrec_read() returns the number of keyrecs read from the file.

Failure return values:

     -1 specified I<keyrec> file doesn't exit
     -2 unable to open I<keyrec> file
     -3 duplicate I<keyrec> names in file
 
 

keyrec_recval(keyrec_name,keyrec_field)

This routine returns the value of a specified field in a given keyrec. keyrec_name is the name of the particular keyrec to consult. keyrec_field is the field name within that keyrec.

For example, the current keyrec file contains the following keyrec:

     zone        "example.com"
                 zonefile        "db.example.com"
 
 

The call:

     keyrec_recval("example.com","zonefile")
 
 

will return the value ``db.example.com''.

keyrec_revoke_check(key)

This interface checks a revoked KSK's keyrec to determine if it is in or out of its revocation period. The key must be a ``kskrev'' type key, and it must have ``revtime'' and ``revperiod'' fields defined in the keyrec.

The determination is made by subtracting the revoke time from the current time. If this is greater than the revocation period, the the key has exceeded the time in which it must be revoked. If not, then it must remain revoked.

Return values:

      1 specified key is outside the revocation period and should be
        marked as obsolete
      0 specified key is in the revocation period and should be left
        revoked
     -1 error (invalid key type, missing I<keyrec> data)
 
 

keyrec_saveas(keyrec_file_copy)

This interface saves the internal version of the keyrec file (opened with keyrec_creat(), keyrec_open() or keyrec_read()) to the file named in the keyrec_file_copy parameter. The new file's file handle is closed, but the original file and the file handle to the original file are not affected.

keyrec_setval(keyrec_type,keyrec_name,field,value)

Set the value of a name/field pair in a specified keyrec. The file is not written after updating the value. The value is saved in both %keyrecs and in @keyreclines, and the file-modified flag is set.

keyrec_type specifies the type of the keyrec. This is only used if a new keyrec is being created by this call. keyrec_name is the name of the keyrec that will be modified. field is the keyrec field which will be modified. value is the new value for the field.

Return values are:

     0 if the creation succeeded
     -1 invalid type was given
 
 

keyrec_settime(keyrec_type,keyrec_name)

Set the timestamp of a specified keyrec. The file is not written after updating the value. The value is saved in both %keyrecs and in @keyreclines, and the file-modified flag is set. The keyrec's keyrec_signdate and keyrec_signsecs fields are modified.

keyrec_write()

This interface saves the internal version of the keyrec file (opened with keyrec_creat(), keyrec_open() or keyrec_read()). It does not close the file handle. As an efficiency measure, an internal modification flag is checked prior to writing the file. If the program has not modified the contents of the keyrec file, it is not rewritten.

keyrec_zonefields()

This routine returns a list of the recognized fields for a zone keyrec.

KEYREC SIGNING-SET INTERFACES

Signing Sets are collections of encryption keys, defined by inclusion in a particular ``set'' keyrec. The names of the keys are in the keyrec's keys record, which contains the names of the key keyrecs. Due to the way key names are handled, the names in a Signing Set must not contain spaces.

The Signing-Set-specific interfaces are given below.

keyrec_signset_newname(zone_name)

keyrec_signset_newname() creates a name for a new Signing Set. The name will be generated by referencing the lastset field in the keyrec for zone zone_name, if the keyrec has such a field. The set index number (described below) will be incremented and the lastset with the new index number will be returned as the new Signing Set name. If the zone keyrec does not have a lastset field, then the default set name of signing-set-0 will be used.

The set index number is the first number found in the lastset field. It doesn't matter where in the field it is found, the first number will be considered to be the Signing Set index. The examples below show how this is determined:

     lastset field               index
     -------------               -----
     signing-set-0                  0
     signing-0-set                  0
     1-signing-0-set                1
     signing-88-set-1              88
     signingset4321              4321
 
 

keyrec_signset_new(zone,signing_set_name,set_type)

keyrec_signset_new() creates the Signing Set named by signing_set_name for the zone zone. It is given the type type, which must be one of the following: ``kskcur'', ``kskpub'', ``kskrev'', ``kskobs'', ``zskcur'', ``zskpub'', ``zsknew'', or ``zskobs''.

It returns 1 if the call is successful; 0 if it is not.

keyrec_signset_addkey(signing_set_name,key_list)

keyrec_signset_addkey() adds the keys listed in key_list to the Signing Set named by signing_set_name. key_list may either be an array or a set or arguments to the routine. The keyrec is created if it does not already exist. It returns 1 if the call is successful; 0 if it is not.

keyrec_signset_delkey(signing_set_name,key_name)

keyrec_signset_delkey() deletes the key given in key_name to the Signing Set named by signing_set_name. It returns 1 if the call is successful; 0 if it is not.

keyrec_signset_haskey(signing_set_name,key_name)

keyrec_signset_haskey() returns a flag indicating if the key specified in key_name is one of the keys in the Signing Set named by signing_set_name. It returns 1 if the signing set has the key; 0 if it does not.

keyrec_signset_clear(keyrec_name)

keyrec_signset_clear() clears the entire signing set from the keyrec named by keyrec_name. It returns 1 if the call is successful; 0 if it is not.

keyrec_signsets()

keyrec_signsets() returns the names of the signing sets in the keyrec file. These names are returned in an array.

KEYREC INTERNAL INTERFACES

The interfaces described in this section are intended for internal use by the keyrec.pm module. However, there are situations where external entities may have need of them. Use with caution, as misuse may result in damaged or lost keyrec files.

keyrec_init()

This routine initializes the internal keyrec data. Pending changes will be lost. An open keyrec file handle will remain open, though the data are no longer held internally. A new keyrec file must be read in order to use the keyrec.pm interfaces again.

keyrec_newkeyrec(kr_name,kr_type)

This interface creates a new keyrec. The keyrec_name and keyrec_hash fields in the keyrec are set to the values of the kr_name and kr_type parameters. kr_type must be either ``key'' or ``zone''.

Return values are:

     0 if the creation succeeded
     -1 if an invalid I<keyrec> type was given
 
 

KEYREC DEBUGGING INTERFACES

The following interfaces display information about the currently parsed keyrec file. They are intended to be used for debugging and testing, but may be useful at other times.

keyrec_dump_hash()

This routine prints the keyrec file as it is stored internally in a hash table. The keyrecs are printed in alphabetical order, with the fields alphabetized for each keyrec. New keyrecs and keyrec fields are alphabetized along with current keyrecs and fields. Comments from the keyrec file are not included with the hash table.

keyrec_dump_array()

This routine prints the keyrec file as it is stored internally in an array. The keyrecs are printed in the order given in the file, with the fields ordered in the same manner. New keyrecs are appended to the end of the array. keyrec fields added to existing keyrecs are added at the beginning of the keyrec entry. Comments and vertical whitespace are preserved as given in the keyrec file.

COPYRIGHT

Copyright 2005-2010 SPARTA, Inc. All rights reserved. See the COPYING file included with the DNSSEC-Tools package for details.

AUTHOR

Wayne Morrison, tewok@users.sourceforge.net

SEE ALSO

Net::DNS::SEC::Tools::conf(5), Net::DNS::SEC::Tools::keyrec(5)