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tor/src/or/keypin.h

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2017-03-15 21:13:17 +01:00
/* Copyright (c) 2014-2017, The Tor Project, Inc. */
Key-pinning back-end for directory authorities. This module implements a key-pinning mechanism to ensure that it's safe to use RSA keys as identitifers even as we migrate to Ed25519 keys. It remembers, for every Ed25519 key we've seen, what the associated Ed25519 key is. This way, if we see a different Ed25519 key with that RSA key, we'll know that there's a mismatch. We persist these entries to disk using a simple format, where each line has a base64-encoded RSA SHA1 hash, then a base64-endoded Ed25519 key. Empty lines, misformed lines, and lines beginning with a # are ignored. Lines beginning with @ are reserved for future extensions.
2014-10-02 21:34:23 +02:00
/* See LICENSE for licensing information */
#ifndef TOR_KEYPIN_H
#define TOR_KEYPIN_H
#include "testsupport.h"
int keypin_check_and_add(const uint8_t *rsa_id_digest,
New AuthDirPinKeys option to enable/disable keypinning enforcement Implements ticket #17135. We're going to need this one to avoid chaos as everybody figures out how ed25519 keys work.
2015-09-23 17:22:26 +02:00
const uint8_t *ed25519_id_key,
const int replace_existing_entry);
Tie key-pinning logic into directory authority operation With this patch: * Authorities load the key-pinning log at startup. * Authorities open a key-pinning log for writing at startup. * Authorities reject any router with an ed25519 key where they have previously seen that ed25519 key with a different RSA key, or vice versa. * Authorities warn about, but *do not* reject, RSA-only descriptors when the RSA key has previously gone along with an Ed25519 key. (We should make this a 'reject' too, but we can't do that until we're sure there's no legit reason to downgrade to 0.2.5.)
2014-10-08 14:32:00 +02:00
int keypin_check(const uint8_t *rsa_id_digest,
const uint8_t *ed25519_id_key);
Key-pinning back-end for directory authorities. This module implements a key-pinning mechanism to ensure that it's safe to use RSA keys as identitifers even as we migrate to Ed25519 keys. It remembers, for every Ed25519 key we've seen, what the associated Ed25519 key is. This way, if we see a different Ed25519 key with that RSA key, we'll know that there's a mismatch. We persist these entries to disk using a simple format, where each line has a base64-encoded RSA SHA1 hash, then a base64-endoded Ed25519 key. Empty lines, misformed lines, and lines beginning with a # are ignored. Lines beginning with @ are reserved for future extensions.
2014-10-02 21:34:23 +02:00
int keypin_open_journal(const char *fname);
int keypin_close_journal(void);
int keypin_load_journal(const char *fname);
void keypin_clear(void);
int keypin_check_lone_rsa(const uint8_t *rsa_id_digest);
#define KEYPIN_FOUND 0
#define KEYPIN_ADDED 1
#define KEYPIN_MISMATCH -1
#define KEYPIN_NOT_FOUND -2
#ifdef KEYPIN_PRIVATE
/**
* In-memory representation of a key-pinning table entry.
*/
typedef struct keypin_ent_st {
HT_ENTRY(keypin_ent_st) rsamap_node;
HT_ENTRY(keypin_ent_st) edmap_node;
/** SHA1 hash of the RSA key */
uint8_t rsa_id[DIGEST_LEN];
/** Ed2219 key. */
uint8_t ed25519_key[DIGEST256_LEN];
} keypin_ent_t;
STATIC keypin_ent_t * keypin_parse_journal_line(const char *cp);
STATIC int keypin_load_journal_impl(const char *data, size_t size);
MOCK_DECL(STATIC void, keypin_add_entry_to_map, (keypin_ent_t *ent));
#endif
#endif
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