Files
s390-tools/zkey/keystore.h
Ingo Franzki 7c47ea8e09 zkey: Add support to store LUKS2 dummy passphrase in key repository
Extend zkey to allow to store a (dummy) LUKS2 passphrase together with a
secure key, for use with LUKS2 volumes. That way, when the repository is
backed up, or archived, also the passphrases of the associated LUKS2
volumes are backed up, or archived, and thus can not be forgotten.
This passphrase is then used in generated commands to format and open
the LUKS2 volumes.

Because of the use of secure keys to encrypt the volumes, the LUKS2
passphrase is of no or less relevance for security. It is therefore OK to
store the passphrase in clear text in the key repository, and also use
them in /etc/crypttab. Therefore, the passphrase could actually be a
trivial passphrase, or a dummy passphrase.

Note: Such a dummy passphrase is NOT considered a secret that needs to
be protected. If for a certain usage the passphrase is of relevance for
security, then the zkey dummy passphrase option must not be used to store
the passphrase.

Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
2020-12-15 11:10:50 +01:00

154 lines
5.3 KiB
C

/*
* zkey - Generate, re-encipher, and validate secure keys
*
* Keystore handling functions
*
* Copyright IBM Corp. 2018, 2020
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef KEYSTORE_H
#define KEYSTORE_H
#include <stdbool.h>
#include "pkey.h"
#include "kms.h"
struct keystore {
bool verbose;
char *directory;
int lock_fd;
mode_t mode;
gid_t owner;
struct kms_info *kms_info;
};
#define PROP_NAME_KEY_TYPE "key-type"
#define PROP_NAME_CIPHER "cipher"
#define PROP_NAME_IV_MODE "iv-mode"
#define PROP_NAME_DESCRIPTION "description"
#define PROP_NAME_VOLUMES "volumes"
#define PROP_NAME_APQNS "apqns"
#define PROP_NAME_SECTOR_SIZE "sector-size"
#define PROP_NAME_CREATION_TIME "creation-time"
#define PROP_NAME_CHANGE_TIME "update-time"
#define PROP_NAME_REENC_TIME "reencipher-time"
#define PROP_NAME_KEY_VP "verification-pattern"
#define PROP_NAME_VOLUME_TYPE "volume-type"
#define PROP_NAME_KMS "kms"
#define PROP_NAME_KMS_KEY_ID "kms-key-id"
#define PROP_NAME_KMS_KEY_LABEL "kms-key-label"
#define PROP_NAME_KMS_XTS_KEY1_ID "kms-xts-key1-id"
#define PROP_NAME_KMS_XTS_KEY1_LABEL "kms-xts-key1-label"
#define PROP_NAME_KMS_XTS_KEY2_ID "kms-xts-key2-id"
#define PROP_NAME_KMS_XTS_KEY2_LABEL "kms-xts-key2-label"
struct keystore *keystore_new(const char *directory,
struct kms_info *kms_info, bool verbose);
int keystore_generate_key(struct keystore *keystore, const char *name,
const char *description, const char *volumes,
const char *apqns, bool noapqncheck,
size_t sector_size, size_t keybits, bool xts,
const char *clear_key_file, const char *volume_type,
const char *key_type, bool gen_passphrase,
const char *passphrase_file, int pkey_fd);
int keystore_generate_key_kms(struct keystore *keystore, const char *name,
const char *description, const char *volumes,
size_t sector_size, size_t keybits, bool xts,
const char *volume_type, const char *key_type,
bool gen_passphrase, const char *passphrase_file,
struct kms_option *kms_options,
size_t num_kms_options);
int keystore_import_key(struct keystore *keystore, const char *name,
const char *description, const char *volumes,
const char *apqns, bool noapqncheck, size_t sector_size,
const char *import_file, const char *volume_type,
bool gen_passphrase, const char *passphrase_file,
struct ext_lib *lib);
int keystore_change_key(struct keystore *keystore, const char *name,
const char *description, const char *volumes,
const char *apqns, bool noapqncheck,
long int sector_size, const char *volume_type,
bool gen_passphrase, const char *passphrase_file,
bool remove_passphrase, bool quiet);
int keystore_rename_key(struct keystore *keystore, const char *name,
const char *newname);
int keystore_validate_key(struct keystore *keystore, const char *name_filter,
const char *apqn_filter, bool noapqncheck,
int pkey_fd);
int keystore_reencipher_key(struct keystore *keystore, const char *name_filter,
const char *apqn_filter,
bool from_old, bool to_new, bool inplace,
bool staged, bool complete, int pkey_fd,
struct ext_lib *lib);
int keystore_copy_key(struct keystore *keystore, const char *name,
const char *newname, const char *volumes, bool local);
int keystore_export_key(struct keystore *keystore, const char *name,
const char *export_file);
int keystore_remove_key(struct keystore *keystore, const char *name,
bool quiet, struct kms_option *kms_options,
size_t num_kms_options);
int keystore_list_keys(struct keystore *keystore, const char *name_filter,
const char *volume_filter, const char *apqn_filter,
const char *volume_type, const char *key_type,
bool local, bool kms_bound);
int keystore_cryptsetup(struct keystore *keystore, const char *volume_filter,
bool execute, const char *volume_type,
const char *keyfile, size_t keyfile_offset,
size_t keyfile_size, size_t tries, bool batch_mode,
bool open, bool format);
int keystore_crypttab(struct keystore *keystore, const char *volume_filter,
const char *volume_type, const char *keyfile,
size_t keyfile_offset, size_t keyfile_size, size_t tries);
int keystore_convert_key(struct keystore *keystore, const char *name,
const char *key_type, bool noapqncheck, bool quiet,
int pkey_fd, struct ext_lib *lib);
int keystore_kms_keys_set_property(struct keystore *keystore,
const char *key_type,
const char *prop_name,
const char *prop_value);
int keystore_kms_keys_unbind(struct keystore *keystore);
int keystore_msg_for_kms_key(struct keystore *keystore, const char *key_type,
const char *msg);
int keystore_import_kms_keys(struct keystore *keystore,
const char *label_filter,
const char *name_filter,
const char *volume_filter,
const char *volume_type,
struct kms_option *kms_options,
size_t num_kms_options,
bool batch_mode, bool novolcheck);
int keystore_refresh_kms_keys(struct keystore *keystore,
const char *name_filter,
const char *volume_filter,
const char *volume_type, const char *key_type,
bool refres_properties, bool novolcheck);
void keystore_free(struct keystore *keystore);
#endif