HDB(3)

NAME
HDB

SYNOPSIS

#include <hdb.h>

  Data Fields
char * hdb_name
krb5_error_code(* hdb_open )(krb5_context, struct HDB *, int, mode_t)
krb5_error_code(* hdb_close )(krb5_context, struct HDB *)
void(* hdb_free )(krb5_context, struct HDB *, hdb_entry_ex *)
krb5_error_code(* hdb_fetch_kvno )(krb5_context, struct HDB *, krb5_const_principal, unsigned, krb5_kvno, hdb_entry_ex *)
krb5_error_code(* hdb_store )(krb5_context, struct HDB *, unsigned, hdb_entry_ex *)
krb5_error_code(* hdb_remove )(krb5_context, struct HDB *, unsigned, krb5_const_principal)
krb5_error_code(* hdb_firstkey )(krb5_context, struct HDB *, unsigned, hdb_entry_ex *)
krb5_error_code(* hdb_nextkey )(krb5_context, struct HDB *, unsigned, hdb_entry_ex *)
krb5_error_code(* hdb_lock )(krb5_context, struct HDB *, int)
krb5_error_code(* hdb_unlock )(krb5_context, struct HDB *)
krb5_error_code(* hdb_rename )(krb5_context, struct HDB *, const char *)
krb5_error_code(* hdb__get )(krb5_context, struct HDB *, krb5_data, krb5_data *)
krb5_error_code(* hdb__put )(krb5_context, struct HDB *, int, krb5_data, krb5_data)
krb5_error_code(* hdb__del )(krb5_context, struct HDB *, krb5_data)
krb5_error_code(* hdb_destroy )(krb5_context, struct HDB *)
krb5_error_code(* hdb_get_realms )(krb5_context, struct HDB *, krb5_realm **)
krb5_error_code(* hdb_password )(krb5_context, struct HDB *, hdb_entry_ex *, const char *, int)
krb5_error_code(* hdb_auth_status )(krb5_context, struct HDB *, hdb_entry_ex *, int)
krb5_error_code(* hdb_check_constrained_delegation )(krb5_context, struct HDB *, hdb_entry_ex *, krb5_const_principal)
krb5_error_code(* hdb_check_pkinit_ms_upn_match )(krb5_context, struct HDB *, hdb_entry_ex *, krb5_const_principal)
krb5_error_code(* hdb_check_s4u2self )(krb5_context, struct HDB *, hdb_entry_ex *, krb5_const_principal)
krb5_error_code(* hdb_set_sync )(krb5_context, struct HDB *, int)

Detailed Description

HDB backend function pointer structure

The HDB structure is what the KDC and kadmind framework uses to query the backend database when talking about principals.

Field Documentation

  krb5_error_code(* HDB::hdb__del) (krb5_context, struct HDB *, krb5_data)
Delete and hdb_entry from a classical DB backend

This function takes a principal key (krb5_data) naming the record to delete.

Same discussion as in HDB::hdb__put

  krb5_error_code(* HDB::hdb__get) (krb5_context, struct HDB *, krb5_data, krb5_data *)
Get an hdb_entry from a classical DB backend

This function takes a principal key (krb5_data) and returns all data related to principal in the return krb5_data. The returned encoded entry is of type hdb_entry or hdb_entry_alias.

  krb5_error_code(* HDB::hdb__put) (krb5_context, struct HDB *, int, krb5_data, krb5_data)
Store an hdb_entry from a classical DB backend

This function takes a principal key (krb5_data) and encoded hdb_entry or hdb_entry_alias as the data to store.

For a file-based DB, this must synchronize to disk when done. This is sub-optimal for kadm5_s_rename_principal(), and for kadm5_s_modify_principal() when using principal aliases; to improve this so that only one fsync() need be done per-transaction will require HDB API extensions.

  krb5_error_code(* HDB::hdb_auth_status) (krb5_context, struct HDB *, hdb_entry_ex *, int)
Auth feedback

This is a feedback call that allows backends that provides lockout functionality to register failure and/or successes.

In case the entry is locked out, the backend should set the hdb_entry.flags.locked-out flag.

  krb5_error_code(* HDB::hdb_check_constrained_delegation) (krb5_context, struct HDB *, hdb_entry_ex *, krb5_const_principal)
Check if delegation is allowed.

  krb5_error_code(* HDB::hdb_check_pkinit_ms_upn_match) (krb5_context, struct HDB *, hdb_entry_ex *, krb5_const_principal)
Check if this name is an alias for the supplied client for PKINIT userPrinicpalName logins

  krb5_error_code(* HDB::hdb_check_s4u2self) (krb5_context, struct HDB *, hdb_entry_ex *, krb5_const_principal)
Check if s4u2self is allowed from this client to this server

  krb5_error_code(* HDB::hdb_close) (krb5_context, struct HDB *)
Close the database for transaction

Closes the database for further transactions, wont release any permanant resources. the database can be ->hdb_open-ed again.

  krb5_error_code(* HDB::hdb_destroy) (krb5_context, struct HDB *)
Destroy the handle to the database.

Destroy the handle to the database, deallocate all memory and related resources. Does not remove any permanent data. Its the logical reverse of hdb_create() function that is the entry point for the module.

  krb5_error_code(* HDB::hdb_fetch_kvno) (krb5_context, struct HDB *, krb5_const_principal, unsigned, krb5_kvno, hdb_entry_ex *)
Fetch an entry from the backend

Fetch an entry from the backend, flags are what type of entry should be fetch: client, server, krbtgt. knvo (if specified and flags HDB_F_KVNO_SPECIFIED set) is the kvno to get

  krb5_error_code(* HDB::hdb_firstkey) (krb5_context, struct HDB *, unsigned, hdb_entry_ex *)
As part of iteration, fetch one entry

  void(* HDB::hdb_free) (krb5_context, struct HDB *, hdb_entry_ex *)
Free an entry after use.

  krb5_error_code(* HDB::hdb_get_realms) (krb5_context, struct HDB *, krb5_realm **)
Get the list of realms this backend handles. This call is optional to support. The returned realms are used for announcing the realms over bonjour. Free returned array with krb5_free_host_realm().

  krb5_error_code(* HDB::hdb_lock) (krb5_context, struct HDB *, int)
Lock database

A lock can only be held by one consumers. Transaction can still happen on the database while the lock is held, so the entry is only useful for syncroning creation of the database and renaming of the database.

  char* HDB::hdb_name
don't use, only for DB3

  krb5_error_code(* HDB::hdb_nextkey) (krb5_context, struct HDB *, unsigned, hdb_entry_ex *)
As part of iteration, fetch next entry

  krb5_error_code(* HDB::hdb_open) (krb5_context, struct HDB *, int, mode_t)
Open (or create) the a Kerberos database.

Open (or create) the a Kerberos database that was resolved with hdb_create(). The third and fourth flag to the function are the same as open(), thus passing O_CREAT will create the data base if it doesn't exists.

Then done the caller should call hdb_close(), and to release all resources hdb_destroy().

  krb5_error_code(* HDB::hdb_password) (krb5_context, struct HDB *, hdb_entry_ex *, const char *, int)
Change password.

Will update keys for the entry when given password. The new keys must be written into the entry and will then later be ->hdb_store() into the database. The backend will still perform all other operations, increasing the kvno, and update modification timestamp.

The backend needs to call _kadm5_set_keys() and perform password quality checks.

  krb5_error_code(* HDB::hdb_remove) (krb5_context, struct HDB *, unsigned, krb5_const_principal)
Remove an entry from the database.

  krb5_error_code(* HDB::hdb_rename) (krb5_context, struct HDB *, const char *)
Rename the data base.

Assume that the database is not hdb_open'ed and not locked.

  krb5_error_code(* HDB::hdb_set_sync) (krb5_context, struct HDB *, int)
Enable/disable synchronous updates

Calling this with 0 disables sync. Calling it with non-zero enables sync and does an fsync().

  krb5_error_code(* HDB::hdb_store) (krb5_context, struct HDB *, unsigned, hdb_entry_ex *)
Store an entry to database

  krb5_error_code(* HDB::hdb_unlock) (krb5_context, struct HDB *)
Unlock database

Author

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