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hsmd: Add hsmd_validate_revocation.

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Ken Sedgwick 2021-10-29 16:45:39 -07:00 • committed by Rusty Russell
parent 405239e353
commit fe9f426e07
4 changed files with 46 additions and 0 deletions
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14
channeld/channeld.c
View file

@ -1785,6 +1785,7 @@ static void handle_peer_revoke_and_ack(struct peer *peer, const u8 *msg)
struct secret old_commit_secret;
struct privkey privkey;
struct channel_id channel_id;
const u8 *revocation_msg;
struct pubkey per_commit_point, next_per_commit;
const struct htlc **changed_htlcs = tal_arr(msg, const struct htlc *, 0);
@ -1799,6 +1800,19 @@ static void handle_peer_revoke_and_ack(struct peer *peer, const u8 *msg)
"Unexpected revoke_and_ack");
}
/* Submit the old revocation secret to the signer so it can
* independently verify that the latest state is commited. It
* is also validated in this routine after the signer returns.
*/
revocation_msg = towire_hsmd_validate_revocation(tmpctx,
peer->next_index[REMOTE] - 2,
&old_commit_secret);
revocation_msg = hsm_req(tmpctx, take(revocation_msg));
if (!fromwire_hsmd_validate_revocation_reply(revocation_msg))
status_failed(STATUS_FAIL_HSM_IO,
"Bad hsmd_validate_revocation_reply: %s",
tal_hex(tmpctx, revocation_msg));
/* BOLT #2:
*
* A receiving node:

2
hsmd/hsmd.c
View file

@ -641,6 +641,7 @@ static struct io_plan *handle_client(struct io_conn *conn, struct client *c)
#endif /* DEVELOPER */
case WIRE_HSMD_SIGN_COMMITMENT_TX:
case WIRE_HSMD_VALIDATE_REVOCATION:
case WIRE_HSMD_SIGN_PENALTY_TO_US:
case WIRE_HSMD_SIGN_REMOTE_COMMITMENT_TX:
case WIRE_HSMD_SIGN_REMOTE_HTLC_TX:
@ -676,6 +677,7 @@ static struct io_plan *handle_client(struct io_conn *conn, struct client *c)
case WIRE_HSMD_INIT_REPLY:
case WIRE_HSMSTATUS_CLIENT_BAD_REQUEST:
case WIRE_HSMD_SIGN_COMMITMENT_TX_REPLY:
case WIRE_HSMD_VALIDATE_REVOCATION_REPLY:
case WIRE_HSMD_SIGN_TX_REPLY:
case WIRE_HSMD_SIGN_OPTION_WILL_FUND_OFFER_REPLY:
case WIRE_HSMD_GET_PER_COMMITMENT_POINT_REPLY:

8
hsmd/hsmd_wire.csv
View file

@ -107,6 +107,14 @@ msgdata,hsmd_sign_commitment_tx,remote_funding_key,pubkey,
msgtype,hsmd_sign_commitment_tx_reply,105
msgdata,hsmd_sign_commitment_tx_reply,sig,bitcoin_signature,
# Vaidate the counterparty's revocation secret
msgtype,hsmd_validate_revocation,36
msgdata,hsmd_validate_revocation,revoke_num,u64,
msgdata,hsmd_validate_revocation,per_commitment_secret,secret,
# No value returned.
msgtype,hsmd_validate_revocation_reply,136
# Onchaind asks HSM to sign a spend to-us. Four variants, since each set
# of keys is derived differently...
# FIXME: Have master tell hsmd the keyindex, so it can validate output!

1 # Clients should not give a bad request but not the HSM's decision to crash.
107 msgdata,hsmd_sign_penalty_to_us,wscript,u8,wscript_len msgdata,hsmd_sign_remote_htlc_to_us,wscript,u8,wscript_len
108 # Onchaind asks HSM to sign a local HTLC success or HTLC timeout tx. msgdata,hsmd_sign_remote_htlc_to_us,option_anchor_outputs,bool,
109 msgtype,hsmd_sign_local_htlc_tx,16 msgtype,hsmd_sign_penalty_to_us,14
110 msgdata,hsmd_sign_penalty_to_us,revocation_secret,secret,
111 msgdata,hsmd_sign_penalty_to_us,tx,bitcoin_tx,
112 msgdata,hsmd_sign_penalty_to_us,wscript_len,u16,
113 msgdata,hsmd_sign_penalty_to_us,wscript,u8,wscript_len
114 # Onchaind asks HSM to sign a local HTLC success or HTLC timeout tx.
115 msgtype,hsmd_sign_local_htlc_tx,16
116 msgdata,hsmd_sign_local_htlc_tx,commit_num,u64,
117 msgdata,hsmd_sign_local_htlc_tx,tx,bitcoin_tx,
118 msgdata,hsmd_sign_local_htlc_tx,commit_num,u64, msgdata,hsmd_sign_local_htlc_tx,wscript_len,u16,
119 msgdata,hsmd_sign_local_htlc_tx,tx,bitcoin_tx, msgdata,hsmd_sign_local_htlc_tx,wscript,u8,wscript_len
120 msgdata,hsmd_sign_local_htlc_tx,wscript_len,u16, msgdata,hsmd_sign_local_htlc_tx,option_anchor_outputs,bool,

22
hsmd/libhsmd.c
View file

@ -95,6 +95,7 @@ bool hsmd_check_client_capabilities(struct hsmd_client *client,
case WIRE_HSMD_SIGN_REMOTE_COMMITMENT_TX:
case WIRE_HSMD_SIGN_REMOTE_HTLC_TX:
case WIRE_HSMD_VALIDATE_REVOCATION:
return (client->capabilities & HSM_CAP_SIGN_REMOTE_TX) != 0;
case WIRE_HSMD_SIGN_MUTUAL_CLOSE_TX:
@ -128,6 +129,7 @@ bool hsmd_check_client_capabilities(struct hsmd_client *client,
case WIRE_HSMD_INIT_REPLY:
case WIRE_HSMSTATUS_CLIENT_BAD_REQUEST:
case WIRE_HSMD_SIGN_COMMITMENT_TX_REPLY:
case WIRE_HSMD_VALIDATE_REVOCATION_REPLY:
case WIRE_HSMD_SIGN_TX_REPLY:
case WIRE_HSMD_SIGN_OPTION_WILL_FUND_OFFER_REPLY:
case WIRE_HSMD_GET_PER_COMMITMENT_POINT_REPLY:
@ -1258,6 +1260,23 @@ static u8 *handle_sign_commitment_tx(struct hsmd_client *c, const u8 *msg_in)
return towire_hsmd_sign_commitment_tx_reply(NULL, &sig);
}
/* This stub implementation is overriden by fully validating signers
* that need to independently verify that the latest state is
* commited. */
static u8 *handle_validate_revocation(struct hsmd_client *c, const u8 *msg_in)
{
u64 revoke_num;
struct secret old_secret;
if (!fromwire_hsmd_validate_revocation(msg_in,
&revoke_num, &old_secret))
return hsmd_status_malformed_request(c, msg_in);
/* Stub implementation, relies on validation in channeld. */
return towire_hsmd_validate_revocation_reply(NULL);
}
/*~ This is used when a commitment transaction is onchain, and has an HTLC
* output paying to us (because we have the preimage); this signs that
* transaction, which lightningd will broadcast to collect the funds. */
@ -1431,6 +1450,8 @@ u8 *hsmd_handle_client_message(const tal_t *ctx, struct hsmd_client *client,
return handle_sign_penalty_to_us(client, msg);
case WIRE_HSMD_SIGN_COMMITMENT_TX:
return handle_sign_commitment_tx(client, msg);
case WIRE_HSMD_VALIDATE_REVOCATION:
return handle_validate_revocation(client, msg);
case WIRE_HSMD_SIGN_REMOTE_HTLC_TO_US:
return handle_sign_remote_htlc_to_us(client, msg);
case WIRE_HSMD_SIGN_DELAYED_PAYMENT_TO_US:
@ -1447,6 +1468,7 @@ u8 *hsmd_handle_client_message(const tal_t *ctx, struct hsmd_client *client,
case WIRE_HSMD_INIT_REPLY:
case WIRE_HSMSTATUS_CLIENT_BAD_REQUEST:
case WIRE_HSMD_SIGN_COMMITMENT_TX_REPLY:
case WIRE_HSMD_VALIDATE_REVOCATION_REPLY:
case WIRE_HSMD_SIGN_TX_REPLY:
case WIRE_HSMD_SIGN_OPTION_WILL_FUND_OFFER_REPLY:
case WIRE_HSMD_GET_PER_COMMITMENT_POINT_REPLY: