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254 lines
7.2 KiB
254 lines
7.2 KiB
#include "bitcoin/privkey.h"
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#include "bitcoin/shadouble.h"
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#include "bitcoin/signature.h"
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#include "lightningd.h"
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#include "log.h"
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#include "peer.h"
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#include "secrets.h"
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#include "utils.h"
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#include <ccan/crypto/sha256/sha256.h>
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#include <ccan/crypto/shachain/shachain.h>
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#include <ccan/mem/mem.h>
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#include <ccan/noerr/noerr.h>
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#include <ccan/read_write_all/read_write_all.h>
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/str/str.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <secp256k1.h>
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#include <sodium/randombytes.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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struct secret {
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/* Secret ID of our node; public is dstate->id. */
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struct privkey privkey;
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};
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void privkey_sign(struct lightningd_state *dstate, const void *src, size_t len,
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struct signature *sig)
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{
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struct sha256_double h;
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sha256_double(&h, memcheck(src, len), len);
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sign_hash(&dstate->secret->privkey, &h, sig);
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}
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struct peer_secrets {
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/* Two private keys, one for commit txs, one for final output. */
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struct privkey commit, final;
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/* Seed from which we generate revocation hashes. */
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struct sha256 revocation_seed;
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};
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void peer_sign_theircommit(const struct peer *peer,
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struct bitcoin_tx *commit,
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struct signature *sig)
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{
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/* Commit tx only has one input: that of the anchor. */
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sign_tx_input(commit, 0,
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NULL, 0,
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peer->anchor.witnessscript,
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&peer->secrets->commit,
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&peer->local.commitkey,
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sig);
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}
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void peer_sign_ourcommit(const struct peer *peer,
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struct bitcoin_tx *commit,
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struct signature *sig)
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{
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/* Commit tx only has one input: that of the anchor. */
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sign_tx_input(commit, 0,
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NULL, 0,
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peer->anchor.witnessscript,
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&peer->secrets->commit,
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&peer->local.commitkey,
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sig);
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}
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void peer_sign_spend(const struct peer *peer,
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struct bitcoin_tx *spend,
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const u8 *commit_witnessscript,
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struct signature *sig)
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{
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/* Spend tx only has one input: that of the commit tx. */
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sign_tx_input(spend, 0,
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NULL, 0,
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commit_witnessscript,
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&peer->secrets->final,
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&peer->local.finalkey,
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sig);
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}
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void peer_sign_htlc_refund(const struct peer *peer,
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struct bitcoin_tx *spend,
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const u8 *htlc_witnessscript,
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struct signature *sig)
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{
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/* Spend tx only has one input: that of the commit tx. */
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sign_tx_input(spend, 0,
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NULL, 0,
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htlc_witnessscript,
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&peer->secrets->final,
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&peer->local.finalkey,
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sig);
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}
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void peer_sign_htlc_fulfill(const struct peer *peer,
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struct bitcoin_tx *spend,
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const u8 *htlc_witnessscript,
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struct signature *sig)
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{
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/* Spend tx only has one input: that of the commit tx. */
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sign_tx_input(spend, 0,
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NULL, 0,
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htlc_witnessscript,
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&peer->secrets->final,
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&peer->local.finalkey,
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sig);
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}
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void peer_sign_mutual_close(const struct peer *peer,
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struct bitcoin_tx *close,
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struct signature *sig)
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{
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sign_tx_input(close, 0,
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NULL, 0,
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peer->anchor.witnessscript,
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&peer->secrets->commit,
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&peer->local.commitkey,
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sig);
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}
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void peer_sign_steal_input(const struct peer *peer,
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struct bitcoin_tx *spend,
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size_t i,
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const u8 *witnessscript,
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struct signature *sig)
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{
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/* Spend tx only has one input: that of the commit tx. */
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sign_tx_input(spend, i,
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NULL, 0,
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witnessscript,
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&peer->secrets->final,
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&peer->local.finalkey,
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sig);
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}
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static void new_keypair(struct lightningd_state *dstate,
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struct privkey *privkey, struct pubkey *pubkey)
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{
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do {
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randombytes_buf(privkey->secret, sizeof(privkey->secret));
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} while (!pubkey_from_privkey(privkey, pubkey));
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}
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void peer_secrets_init(struct peer *peer)
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{
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peer->secrets = tal(peer, struct peer_secrets);
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new_keypair(peer->dstate, &peer->secrets->commit, &peer->local.commitkey);
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new_keypair(peer->dstate, &peer->secrets->final, &peer->local.finalkey);
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randombytes_buf(peer->secrets->revocation_seed.u.u8, sizeof(peer->secrets->revocation_seed.u.u8));
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}
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void peer_get_revocation_preimage(const struct peer *peer, u64 index,
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struct sha256 *preimage)
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{
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// generate hashes in reverse order, otherwise the first hash gives away everything
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shachain_from_seed(&peer->secrets->revocation_seed, 0xFFFFFFFFFFFFFFFFL - index, preimage);
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}
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void peer_get_revocation_hash(const struct peer *peer, u64 index,
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struct sha256 *rhash)
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{
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struct sha256 preimage;
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peer_get_revocation_preimage(peer, index, &preimage);
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sha256(rhash, preimage.u.u8, sizeof(preimage.u.u8));
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}
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const char *peer_secrets_for_db(const tal_t *ctx, struct peer *peer)
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{
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const struct peer_secrets *ps = peer->secrets;
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return tal_fmt(ctx, "x'%s', x'%s', x'%s'",
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tal_hexstr(ctx, &ps->commit, sizeof(ps->commit)),
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tal_hexstr(ctx, &ps->final, sizeof(ps->final)),
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tal_hexstr(ctx, &ps->revocation_seed,
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sizeof(ps->revocation_seed)));
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}
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void peer_set_secrets_from_db(struct peer *peer,
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const void *commit_privkey,
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size_t commit_privkey_len,
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const void *final_privkey,
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size_t final_privkey_len,
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const void *revocation_seed,
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size_t revocation_seed_len)
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{
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struct peer_secrets *ps = tal(peer, struct peer_secrets);
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assert(!peer->secrets);
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peer->secrets = ps;
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if (commit_privkey_len != sizeof(ps->commit)
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|| final_privkey_len != sizeof(ps->final)
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|| revocation_seed_len != sizeof(ps->revocation_seed))
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fatal("peer_set_secrets_from_db: bad lengths %zu/%zu/%zu",
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commit_privkey_len, final_privkey_len,
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revocation_seed_len);
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memcpy(&ps->commit, commit_privkey, commit_privkey_len);
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memcpy(&ps->final, final_privkey, final_privkey_len);
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memcpy(&ps->revocation_seed, revocation_seed, revocation_seed_len);
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if (!pubkey_from_privkey(&ps->commit, &peer->local.commitkey))
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fatal("peer_set_secrets_from_db:bad commit privkey");
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if (!pubkey_from_privkey(&ps->final, &peer->local.finalkey))
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fatal("peer_set_secrets_from_db:bad final privkey");
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}
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void secrets_init(struct lightningd_state *dstate)
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{
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int fd;
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dstate->secret = tal(dstate, struct secret);
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fd = open("privkey", O_RDONLY);
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if (fd < 0) {
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if (errno != ENOENT)
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fatal("Failed to open privkey: %s", strerror(errno));
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log_unusual(dstate->base_log, "Creating privkey file");
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new_keypair(dstate, &dstate->secret->privkey, &dstate->id);
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fd = open("privkey", O_CREAT|O_EXCL|O_WRONLY, 0400);
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if (fd < 0)
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fatal("Failed to create privkey file: %s",
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strerror(errno));
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if (!write_all(fd, dstate->secret->privkey.secret,
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sizeof(dstate->secret->privkey.secret))) {
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unlink_noerr("privkey");
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fatal("Failed to write to privkey file: %s",
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strerror(errno));
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}
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if (fsync(fd) != 0)
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fatal("Failed to sync to privkey file: %s",
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strerror(errno));
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close(fd);
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fd = open("privkey", O_RDONLY);
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if (fd < 0)
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fatal("Failed to reopen privkey: %s", strerror(errno));
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}
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if (!read_all(fd, dstate->secret->privkey.secret,
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sizeof(dstate->secret->privkey.secret)))
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fatal("Failed to read privkey: %s", strerror(errno));
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close(fd);
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if (!pubkey_from_privkey(&dstate->secret->privkey, &dstate->id))
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fatal("Invalid privkey");
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log_info_struct(dstate->base_log, "ID: %s", struct pubkey, &dstate->id);
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}
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