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hsmd: routines to sign remote commitment and HTLC txs. 

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-07-23 11:53:03 +09:30 committed by Christian Decker
parent 613b65eede
commit b9ff130e9e
3 changed files with 122 additions and 2 deletions
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1
hsmd/capabilities.h
View File

@ -5,6 +5,7 @@
#define HSM_CAP_SIGN_GOSSIP 2
#define HSM_CAP_SIGN_ONCHAIN_TX 4
#define HSM_CAP_COMMITMENT_POINT 8
#define HSM_CAP_SIGN_REMOTE_TX 16
#define HSM_CAP_MASTER 1024
#endif /* LIGHTNING_HSMD_CAPABILITIES_H */

106
hsmd/hsm.c
View File

@ -337,6 +337,43 @@ static PRINTF_FMT(3,4)
return io_close(conn);
}
/* FIXME: make sure it meets some criteria? */
static struct io_plan *handle_sign_remote_commitment_tx(struct io_conn *conn,
struct client *c)
{
struct daemon_conn *dc = &c->dc;
struct pubkey remote_funding_pubkey, local_funding_pubkey;
u64 funding_amount;
struct secret channel_seed;
struct bitcoin_tx *tx;
secp256k1_ecdsa_signature sig;
struct secrets secrets;
const u8 *funding_wscript;
if (!fromwire_hsm_sign_remote_commitment_tx(tmpctx, dc->msg_in,
&tx,
&remote_funding_pubkey,
&funding_amount))
master_badmsg(WIRE_HSM_SIGN_REMOTE_COMMITMENT_TX, dc->msg_in);
get_channel_seed(&c->id, c->dbid, &channel_seed);
derive_basepoints(&channel_seed,
&local_funding_pubkey, NULL, &secrets, NULL);
funding_wscript = bitcoin_redeem_2of2(tmpctx,
&local_funding_pubkey,
&remote_funding_pubkey);
/* Need input amount for signing */
tx->input[0].amount = tal_dup(tx->input, u64, &funding_amount);
sign_tx_input(tx, 0, NULL, funding_wscript,
&secrets.funding_privkey,
&local_funding_pubkey,
&sig);
daemon_conn_send(dc, take(towire_hsm_sign_tx_reply(NULL, &sig)));
return daemon_conn_read_next(conn, dc);
}
/* FIXME: Derive output address for this client, and check it here! */
static struct io_plan *handle_sign_to_us_tx(struct io_conn *conn,
struct client *c,
@ -587,6 +624,65 @@ fail:
return io_close(conn);
}
static struct io_plan *handle_sign_remote_htlc_tx(struct io_conn *conn,
struct client *c)
{
struct daemon_conn *dc = &c->dc;
struct secret channel_seed;
struct bitcoin_tx *tx;
secp256k1_ecdsa_signature sig;
struct secrets secrets;
struct basepoints basepoints;
struct pubkey remote_per_commit_point;
u64 amount;
u8 *wscript;
struct privkey htlc_privkey;
struct pubkey htlc_pubkey;
if (!fromwire_hsm_sign_remote_htlc_tx(tmpctx, dc->msg_in,
&tx, &wscript, &amount,
&remote_per_commit_point)) {
status_broken("bad hsm_sign_remote_htlc_tx for client %s",
type_to_string(tmpctx, struct pubkey, &c->id));
goto fail;
}
get_channel_seed(&c->id, c->dbid, &channel_seed);
derive_basepoints(&channel_seed, NULL, &basepoints, &secrets, NULL);
if (!derive_simple_privkey(&secrets.htlc_basepoint_secret,
&basepoints.htlc,
&remote_per_commit_point,
&htlc_privkey)) {
status_broken("Failed deriving htlc privkey for client %s",
type_to_string(tmpctx, struct pubkey, &c->id));
goto fail;
}
if (!derive_simple_key(&basepoints.htlc,
&remote_per_commit_point,
&htlc_pubkey)) {
status_broken("Failed deriving htlc pubkey for client %s",
type_to_string(tmpctx, struct pubkey, &c->id));
goto fail;
}
/* Need input amount for signing */
tx->input[0].amount = tal_dup(tx->input, u64, &amount);
sign_tx_input(tx, 0, NULL, wscript, &htlc_privkey, &htlc_pubkey,
&sig);
daemon_conn_send(dc, take(towire_hsm_sign_tx_reply(NULL, &sig)));
return daemon_conn_read_next(conn, dc);
fail:
daemon_conn_send(c->master,
take(towire_hsmstatus_client_bad_request(NULL,
&c->id,
c->dc.msg_in)));
return io_close(conn);
}
static bool check_client_capabilities(struct client *client,
enum hsm_client_wire_type t)
{
@ -608,6 +704,10 @@ static bool check_client_capabilities(struct client *client,
case WIRE_HSM_GET_PER_COMMITMENT_POINT:
return (client->capabilities & HSM_CAP_COMMITMENT_POINT) != 0;
case WIRE_HSM_SIGN_REMOTE_COMMITMENT_TX:
case WIRE_HSM_SIGN_REMOTE_HTLC_TX:
return (client->capabilities & HSM_CAP_SIGN_REMOTE_TX) != 0;
case WIRE_HSM_INIT:
case WIRE_HSM_CLIENT_HSMFD:
case WIRE_HSM_SIGN_FUNDING:
@ -706,6 +806,12 @@ static struct io_plan *handle_client(struct io_conn *conn,
case WIRE_HSM_GET_PER_COMMITMENT_POINT:
return handle_get_per_commitment_point(conn, c);
case WIRE_HSM_SIGN_REMOTE_COMMITMENT_TX:
return handle_sign_remote_commitment_tx(conn, c);
case WIRE_HSM_SIGN_REMOTE_HTLC_TX:
return handle_sign_remote_htlc_tx(conn, c);
case WIRE_HSM_ECDH_RESP:
case WIRE_HSM_CANNOUNCEMENT_SIG_REPLY:
case WIRE_HSM_CUPDATE_SIG_REPLY:

17
hsmd/hsm_client_wire_csv
View File

@ -135,7 +135,21 @@ hsm_sign_local_htlc_tx,,wscript_len,u16
hsm_sign_local_htlc_tx,,wscript,wscript_len*u8
hsm_sign_local_htlc_tx,,input_amount,u64
# Reply for all the above requests from onchaind.
# Openingd/channeld asks HSM to sign the other sides' commitment tx.
hsm_sign_remote_commitment_tx,19
hsm_sign_remote_commitment_tx,,tx,struct bitcoin_tx
hsm_sign_remote_commitment_tx,,remote_funding_key,struct pubkey
hsm_sign_remote_commitment_tx,,funding_amount,u64
# channeld asks HSM to sign remote HTLC tx.
hsm_sign_remote_htlc_tx,20
hsm_sign_remote_htlc_tx,,tx,struct bitcoin_tx
hsm_sign_remote_htlc_tx,,len,u16
hsm_sign_remote_htlc_tx,,wscript,len*u8
hsm_sign_remote_htlc_tx,,amounts_satoshi,u64
hsm_sign_remote_htlc_tx,,remote_per_commit_point,struct pubkey
# Reply for all the above requests.
hsm_sign_tx_reply,112
hsm_sign_tx_reply,,sig,secp256k1_ecdsa_signature
@ -146,4 +160,3 @@ hsm_get_per_commitment_point,,n,u64
hsm_get_per_commitment_point_reply,118
hsm_get_per_commitment_point_reply,,per_commitment_point,struct pubkey
hsm_get_per_commitment_point_reply,,old_commitment_secret,?struct secret