mirror of
https://github.com/monero-project/monero.git
synced 2024-12-15 12:56:33 +02:00
103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
|
#ifndef UNBOUND_DNSCRYPT_H
|
||
|
|
#define UNBOUND_DNSCRYPT_H
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \file
|
||
|
|
* dnscrypt functions for encrypting DNS packets.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "dnscrypt/dnscrypt_config.h"
|
||
|
|
#ifdef USE_DNSCRYPT
|
||
|
|
|
||
|
|
#define DNSCRYPT_MAGIC_HEADER_LEN 8U
|
||
|
|
#define DNSCRYPT_MAGIC_RESPONSE "r6fnvWj8"
|
||
|
|
|
||
|
|
#ifndef DNSCRYPT_MAX_PADDING
|
||
|
|
# define DNSCRYPT_MAX_PADDING 256U
|
||
|
|
#endif
|
||
|
|
#ifndef DNSCRYPT_BLOCK_SIZE
|
||
|
|
# define DNSCRYPT_BLOCK_SIZE 64U
|
||
|
|
#endif
|
||
|
|
#ifndef DNSCRYPT_MIN_PAD_LEN
|
||
|
|
# define DNSCRYPT_MIN_PAD_LEN 8U
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define crypto_box_HALF_NONCEBYTES (crypto_box_NONCEBYTES / 2U)
|
||
|
|
|
||
|
|
#include "config.h"
|
||
|
|
#include "dnscrypt/cert.h"
|
||
|
|
|
||
|
|
#define DNSCRYPT_QUERY_HEADER_SIZE \
|
||
|
|
(DNSCRYPT_MAGIC_HEADER_LEN + crypto_box_PUBLICKEYBYTES + crypto_box_HALF_NONCEBYTES + crypto_box_MACBYTES)
|
||
|
|
#define DNSCRYPT_RESPONSE_HEADER_SIZE \
|
||
|
|
(DNSCRYPT_MAGIC_HEADER_LEN + crypto_box_NONCEBYTES + crypto_box_MACBYTES)
|
||
|
|
|
||
|
|
#define DNSCRYPT_REPLY_HEADER_SIZE \
|
||
|
|
(DNSCRYPT_MAGIC_HEADER_LEN + crypto_box_HALF_NONCEBYTES * 2 + crypto_box_MACBYTES)
|
||
|
|
|
||
|
|
struct sldns_buffer;
|
||
|
|
struct config_file;
|
||
|
|
struct comm_reply;
|
||
|
|
|
||
|
|
typedef struct KeyPair_ {
|
||
|
|
uint8_t crypt_publickey[crypto_box_PUBLICKEYBYTES];
|
||
|
|
uint8_t crypt_secretkey[crypto_box_SECRETKEYBYTES];
|
||
|
|
} KeyPair;
|
||
|
|
|
||
|
|
struct dnsc_env {
|
||
|
|
struct SignedCert *signed_certs;
|
||
|
|
size_t signed_certs_count;
|
||
|
|
uint8_t provider_publickey[crypto_sign_ed25519_PUBLICKEYBYTES];
|
||
|
|
uint8_t provider_secretkey[crypto_sign_ed25519_SECRETKEYBYTES];
|
||
|
|
KeyPair *keypairs;
|
||
|
|
size_t keypairs_count;
|
||
|
|
uint64_t nonce_ts_last;
|
||
|
|
unsigned char hash_key[crypto_shorthash_KEYBYTES];
|
||
|
|
char * provider_name;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct dnscrypt_query_header {
|
||
|
|
uint8_t magic_query[DNSCRYPT_MAGIC_HEADER_LEN];
|
||
|
|
uint8_t publickey[crypto_box_PUBLICKEYBYTES];
|
||
|
|
uint8_t nonce[crypto_box_HALF_NONCEBYTES];
|
||
|
|
uint8_t mac[crypto_box_MACBYTES];
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Initialize DNSCrypt enviroment.
|
||
|
|
* Initialize sodium library and allocate the dnsc_env structure.
|
||
|
|
* \return an uninitialized struct dnsc_env.
|
||
|
|
*/
|
||
|
|
struct dnsc_env * dnsc_create(void);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Apply configuration.
|
||
|
|
* Read certificates and secret keys from configuration. Initialize hashkey and
|
||
|
|
* provider name as well as loading cert TXT records.
|
||
|
|
* In case of issue applying configuration, this function fatals.
|
||
|
|
* \param[in] env the struct dnsc_env to populate.
|
||
|
|
* \param[in] cfg the config_file struct with dnscrypt options.
|
||
|
|
* \return 0 on success.
|
||
|
|
*/
|
||
|
|
int dnsc_apply_cfg(struct dnsc_env *env, struct config_file *cfg);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* handle a crypted dnscrypt request.
|
||
|
|
* Determine wether or not a query is coming over the dnscrypt listener and
|
||
|
|
* attempt to uncurve it or detect if it is a certificate query.
|
||
|
|
* return 0 in case of failure.
|
||
|
|
*/
|
||
|
|
int dnsc_handle_curved_request(struct dnsc_env* dnscenv,
|
||
|
|
struct comm_reply* repinfo);
|
||
|
|
/**
|
||
|
|
* handle an unencrypted dnscrypt request.
|
||
|
|
* Determine wether or not a query is going over the dnscrypt channel and
|
||
|
|
* attempt to curve it unless it was not crypted like when it is a
|
||
|
|
* certificate query.
|
||
|
|
* \return 0 in case of failure.
|
||
|
|
*/
|
||
|
|
|
||
|
|
int dnsc_handle_uncurved_request(struct comm_reply *repinfo);
|
||
|
|
#endif /* USE_DNSCRYPT */
|
||
|
|
#endif
|