# Heimdal Kerberos 5 keytab handling functions

## Functions
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_register (krb5_context context, const krb5_kt_ops *ops)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_resolve (krb5_context context, const char *name, krb5_keytab *id)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_default_name (krb5_context context, char *name, size_t namesize)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_default_modify_name (krb5_context context, char *name, size_t namesize)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_default (krb5_context context, krb5_keytab *id)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_read_service_key (krb5_context context, krb5_pointer keyprocarg, krb5_principal principal, krb5_kvno vno, krb5_enctype enctype, krb5_keyblock **key)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_get_type (krb5_context context, krb5_keytab keytab, char *prefix, size_t prefixsize)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_get_name (krb5_context context, krb5_keytab keytab, char *name, size_t namesize)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_get_full_name (krb5_context context, krb5_keytab keytab, char **str)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_close (krb5_context context, krb5_keytab id)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_destroy (krb5_context context, krb5_keytab id)
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL | krb5_kt_compare (krb5_context context, krb5_keytab_entry *entry, krb5_const_principal principal, krb5_kvno vno, krb5_enctype enctype)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_get_entry (krb5_context context, krb5_keytab id, krb5_const_principal principal, krb5_kvno kvno, krb5_enctype enctype, krb5_keytab_entry *entry)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_copy_entry_contents (krb5_context context, const krb5_keytab_entry *in, krb5_keytab_entry *out)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_free_entry (krb5_context context, krb5_keytab_entry *entry)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_start_seq_get (krb5_context context, krb5_keytab id, krb5_kt_cursor *cursor)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_next_entry (krb5_context context, krb5_keytab id, krb5_keytab_entry *entry, krb5_kt_cursor *cursor)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_end_seq_get (krb5_context context, krb5_keytab id, krb5_kt_cursor *cursor)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_add_entry (krb5_context context, krb5_keytab id, krb5_keytab_entry *entry)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL | krb5_kt_remove_entry (krb5_context context, krb5_keytab id, krb5_keytab_entry *entry)
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL | krb5_kt_have_content (krb5_context context, krb5_keytab id)

## Detailed Description

## Function Documentation

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_add_entry | ( | krb5_context | context,
|  | krb5_keytab | id,
|  | krb5_keytab_entry * | entry |
| ) |  |  |

Add the entry in `entry' to the keytab `id'.

Parameters:

  | context | a Keberos context.
  | id | a keytab.
  | entry | the entry to add

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_close | ( | krb5_context | context,
|  | krb5_keytab | id |
| ) |  |  |

Finish using the keytab in `id'. All resources will be released, even on errors.

Parameters:

  | context | a Keberos context.
  | id | keytab to close.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL krb5_kt_compare | ( | krb5_context | context,
|  | krb5_keytab_entry * | entry,
|  | krb5_const_principal | principal,
|  | krb5_kvno | vno,
|  | krb5_enctype | enctype |
| ) |  |  |

Compare `entry' against `principal, vno, enctype'. Any of `principal, vno, enctype' might be 0 which acts as a wildcard. Return TRUE if they compare the same, FALSE otherwise.

Parameters:

  | context | a Keberos context.
  | entry | an entry to match with.
  | principal | principal to match, NULL matches all principals.
  | vno | key version to match, 0 matches all key version numbers.
  | enctype | encryption type to match, 0 matches all encryption types.

Returns:
  Return TRUE or match, FALSE if not matched.

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_copy_entry_contents | ( | krb5_context | context,
|  | const krb5_keytab_entry * | in,
|  | krb5_keytab_entry * | out |
| ) |  |  |

Copy the contents of `in' into `out'.

Parameters:

  | context | a Keberos context.
  | in | the keytab entry to copy.
  | out | the copy of the keytab entry, free with krb5_kt_free_entry().

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_default | ( | krb5_context | context,
|  | krb5_keytab * | id |
| ) |  |  |

Set `id' to the default keytab.

Parameters:

  | context | a Keberos context.
  | id | the new default keytab.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_default_modify_name | ( | krb5_context | context,
|  | char * | name,
|  | size_t | namesize |
| ) |  |  |

Copy the name of the default modify keytab into `name'.

Parameters:

  | context | a Keberos context.
  | name | buffer where the name will be written
  | namesize | length of name

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_default_name | ( | krb5_context | context,
|  | char * | name,
|  | size_t | namesize |
| ) |  |  |

copy the name of the default keytab into `name'.

Parameters:

  | context | a Keberos context.
  | name | buffer where the name will be written
  | namesize | length of name

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_destroy | ( | krb5_context | context,
|  | krb5_keytab | id |
| ) |  |  |

Destroy (remove) the keytab in `id'. All resources will be released, even on errors, does the equvalment of krb5_kt_close() on the resources.

Parameters:

  | context | a Keberos context.
  | id | keytab to destroy.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_end_seq_get | ( | krb5_context | context,
|  | krb5_keytab | id,
|  | krb5_kt_cursor * | cursor |
| ) |  |  |

Release all resources associated with `cursor'.

Parameters:

  | context | a Keberos context.
  | id | a keytab.
  | cursor | the cursor to free.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_free_entry | ( | krb5_context | context,
|  | krb5_keytab_entry * | entry |
| ) |  |  |

Free the contents of `entry'.

Parameters:

  | context | a Keberos context.
  | entry | the entry to free

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_get_entry | ( | krb5_context | context,
|  | krb5_keytab | id,
|  | krb5_const_principal | principal,
|  | krb5_kvno | kvno,
|  | krb5_enctype | enctype,
|  | krb5_keytab_entry * | entry |
| ) |  |  |

Retrieve the keytab entry for `principal, kvno, enctype' into `entry' from the keytab `id'. Matching is done like krb5_kt_compare().

Parameters:

  | context | a Keberos context.
  | id | a keytab.
  | principal | principal to match, NULL matches all principals.
  | kvno | key version to match, 0 matches all key version numbers.
  | enctype | encryption type to match, 0 matches all encryption types.
  | entry | the returned entry, free with krb5_kt_free_entry().

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_get_full_name | ( | krb5_context | context,
|  | krb5_keytab | keytab,
|  | char ** | str |
| ) |  |  |

Retrieve the full name of the keytab `keytab' and store the name in `str'.

Parameters:

  | context | a Keberos context.
  | keytab | keytab to get name for.
  | str | the name of the keytab name, usee krb5_xfree() to free the string. On error, *str is set to NULL.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_get_name | ( | krb5_context | context,
|  | krb5_keytab | keytab,
|  | char * | name,
|  | size_t | namesize |
| ) |  |  |

Retrieve the name of the keytab `keytab' into `name', `namesize'

Parameters:

  | context | a Keberos context.
  | keytab | the keytab to get the name for.
  | name | name buffer.
  | namesize | size of name buffer.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_get_type | ( | krb5_context | context,
|  | krb5_keytab | keytab,
|  | char * | prefix,
|  | size_t | prefixsize |
| ) |  |  |

Return the type of the `keytab' in the string `prefix of length `prefixsize'.

Parameters:

  | context | a Keberos context.
  | keytab | the keytab to get the prefix for
  | prefix | prefix buffer
  | prefixsize | length of prefix buffer

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL krb5_kt_have_content | ( | krb5_context | context,
|  | krb5_keytab | id |
| ) |  |  |

Return true if the keytab exists and have entries

Parameters:

  | context | a Keberos context.
  | id | a keytab.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_next_entry | ( | krb5_context | context,
|  | krb5_keytab | id,
|  | krb5_keytab_entry * | entry,
|  | krb5_kt_cursor * | cursor |
| ) |  |  |

Get the next entry from keytab, advance the cursor. On last entry the function will return KRB5_KT_END.

Parameters:

  | context | a Keberos context.
  | id | a keytab.
  | entry | the returned entry, free with krb5_kt_free_entry().
  | cursor | the cursor of the iteration.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_read_service_key | ( | krb5_context | context,
|  | krb5_pointer | keyprocarg,
|  | krb5_principal | principal,
|  | krb5_kvno | vno,
|  | krb5_enctype | enctype,
|  | krb5_keyblock ** | key |
| ) |  |  |

Read the key identified by `(principal, vno, enctype)' from the keytab in `keyprocarg' (the default if == NULL) into `*key'.

Parameters:

  | context | a Keberos context.
  | keyprocarg |
  | principal |
  | vno |
  | enctype |
  | key |

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_register | ( | krb5_context | context,
|  | const krb5_kt_ops * | ops |
| ) |  |  |

Register a new keytab backend.

Parameters:

  | context | a Keberos context.
  | ops | a backend to register.

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_remove_entry | ( | krb5_context | context,
|  | krb5_keytab | id,
|  | krb5_keytab_entry * | entry |
| ) |  |  |

Remove an entry from the keytab, matching is done using krb5_kt_compare().

Parameters:

  | context | a Keberos context.
  | id | a keytab.
  | entry | the entry to remove

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_resolve | ( | krb5_context | context,
|  | const char * | name,
|  | krb5_keytab * | id |
| ) |  |  |

Resolve the keytab name (of the form `type:residual') in `name' into a keytab in `id'.

Parameters:

  | context | a Keberos context.
  | name | name to resolve
  | id | resulting keytab, free with krb5_kt_close().

Returns:
  Return an error code or 0, see krb5_get_error_message().

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_kt_start_seq_get | ( | krb5_context | context,
|  | krb5_keytab | id,
|  | krb5_kt_cursor * | cursor |
| ) |  |  |

Set `cursor' to point at the beginning of `id'.

Parameters:

  | context | a Keberos context.
  | id | a keytab.
  | cursor | a newly allocated cursor, free with krb5_kt_end_seq_get().

Returns:
  Return an error code or 0, see krb5_get_error_message().