300 lines
7.3 KiB
C
300 lines
7.3 KiB
C
#include <bitcoin/block.h>
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#include <bitcoin/chainparams.h>
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#include <ccan/cast/cast.h>
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#include <ccan/crypto/sha256/sha256.h>
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#include <ccan/mem/mem.h>
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#include <common/bech32.h>
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#include <common/bech32_util.h>
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#include <common/bolt12.h>
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#include <common/bolt12_merkle.h>
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#include <common/features.h>
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#include <secp256k1_schnorrsig.h>
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bool bolt12_chains_match(const struct bitcoin_blkid *chains,
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const struct chainparams *must_be_chain)
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{
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size_t num_chains;
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/* BOLT-offers #12:
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* - if the chain for the invoice is not solely bitcoin:
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* - MUST specify `chains` the offer is valid for.
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* - otherwise:
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* - the bitcoin chain is implied as the first and only entry.
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*/
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/* BOLT-offers #12:
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* The reader of an invoice_request:
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*...
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* - MUST fail the request if `chains` does not include (or
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* imply) a supported chain.
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*/
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/* BOLT-offers #12:
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*
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* - if the chain for the invoice is not solely bitcoin:
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* - MUST specify `chains` the invoice is valid for.
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* - otherwise:
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* - the bitcoin chain is implied as the first and only entry.
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*/
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num_chains = tal_count(chains);
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if (num_chains == 0) {
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num_chains = 1;
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chains = &chainparams_for_network("bitcoin")->genesis_blockhash;
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}
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for (size_t i = 0; i < num_chains; i++) {
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if (bitcoin_blkid_eq(&chains[i],
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&must_be_chain->genesis_blockhash))
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return true;
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}
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return false;
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}
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static char *check_features_and_chain(const tal_t *ctx,
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const struct feature_set *our_features,
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const struct chainparams *must_be_chain,
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const u8 *features,
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const struct bitcoin_blkid *chains)
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{
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if (must_be_chain) {
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if (!bolt12_chains_match(chains, must_be_chain))
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return tal_fmt(ctx, "wrong chain");
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}
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if (our_features) {
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int badf = features_unsupported(our_features, features,
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BOLT11_FEATURE);
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if (badf != -1)
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return tal_fmt(ctx, "unknown feature bit %i", badf);
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}
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return NULL;
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}
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static char *check_signature(const tal_t *ctx,
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const struct tlv_field *fields,
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const char *messagename,
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const char *fieldname,
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const struct pubkey32 *node_id,
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const struct bip340sig *sig)
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{
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struct sha256 m, shash;
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if (!node_id)
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return tal_fmt(ctx, "Missing node_id");
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if (!sig)
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return tal_fmt(ctx, "Missing signature");
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merkle_tlv(fields, &m);
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sighash_from_merkle(messagename, fieldname, &m, &shash);
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if (secp256k1_schnorrsig_verify(secp256k1_ctx,
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sig->u8,
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shash.u.u8,
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&node_id->pubkey) != 1)
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return tal_fmt(ctx, "Invalid signature");
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return NULL;
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}
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static const u8 *string_to_data(const tal_t *ctx,
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const char *str,
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size_t str_len,
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const char *hrp_expected,
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size_t *dlen,
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char **fail)
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{
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char *hrp;
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u8 *data;
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char *bech32;
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size_t bech32_len;
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bool have_plus = false;
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/* First we collapse +\s*, except at start/end. */
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bech32 = tal_arr(tmpctx, char, str_len);
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bech32_len = 0;
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for (size_t i = 0; i < str_len; i++) {
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if (i != 0 && i+1 != str_len && !have_plus && str[i] == '+') {
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have_plus = true;
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continue;
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}
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if (have_plus && cisspace(str[i]))
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continue;
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have_plus = false;
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bech32[bech32_len++] = str[i];
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}
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if (have_plus) {
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*fail = tal_fmt(ctx, "unfinished string");
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return NULL;
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}
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if (!from_bech32_charset(ctx, bech32, bech32_len, &hrp, &data)) {
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*fail = tal_fmt(ctx, "invalid bech32 string");
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return NULL;
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}
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if (!streq(hrp, hrp_expected)) {
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*fail = tal_fmt(ctx, "unexpected prefix %s", hrp);
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data = tal_free(data);
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} else
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*dlen = tal_bytelen(data);
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tal_free(hrp);
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return data;
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}
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char *offer_encode(const tal_t *ctx, const struct tlv_offer *offer_tlv)
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{
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u8 *wire;
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wire = tal_arr(tmpctx, u8, 0);
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towire_offer(&wire, offer_tlv);
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return to_bech32_charset(ctx, "lno", wire);
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}
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struct tlv_offer *offer_decode(const tal_t *ctx,
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const char *b12, size_t b12len,
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const struct feature_set *our_features,
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const struct chainparams *must_be_chain,
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char **fail)
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{
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struct tlv_offer *offer;
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offer = offer_decode_nosig(ctx, b12, b12len,
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our_features, must_be_chain, fail);
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if (offer) {
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*fail = check_signature(ctx, offer->fields,
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"offer", "signature",
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offer->node_id, offer->signature);
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if (*fail)
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offer = tal_free(offer);
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}
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return offer;
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}
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struct tlv_offer *offer_decode_nosig(const tal_t *ctx,
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const char *b12, size_t b12len,
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const struct feature_set *our_features,
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const struct chainparams *must_be_chain,
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char **fail)
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{
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struct tlv_offer *offer = tlv_offer_new(ctx);
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const u8 *data;
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size_t dlen;
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data = string_to_data(tmpctx, b12, b12len, "lno", &dlen, fail);
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if (!data)
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return tal_free(offer);
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if (!fromwire_offer(&data, &dlen, offer)) {
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*fail = tal_fmt(ctx, "invalid offer data");
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return tal_free(offer);
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}
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*fail = check_features_and_chain(ctx,
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our_features, must_be_chain,
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offer->features,
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offer->chains);
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if (*fail)
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return tal_free(offer);
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return offer;
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}
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char *invrequest_encode(const tal_t *ctx, const struct tlv_invoice_request *invrequest_tlv)
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{
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u8 *wire;
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wire = tal_arr(tmpctx, u8, 0);
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towire_invoice_request(&wire, invrequest_tlv);
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return to_bech32_charset(ctx, "lnr", wire);
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}
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struct tlv_invoice_request *invrequest_decode(const tal_t *ctx,
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const char *b12, size_t b12len,
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const struct feature_set *our_features,
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const struct chainparams *must_be_chain,
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char **fail)
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{
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struct tlv_invoice_request *invrequest = tlv_invoice_request_new(ctx);
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const u8 *data;
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size_t dlen;
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data = string_to_data(tmpctx, b12, b12len, "lnr", &dlen, fail);
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if (!data)
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return tal_free(invrequest);
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if (!fromwire_invoice_request(&data, &dlen, invrequest)) {
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*fail = tal_fmt(ctx, "invalid invoice_request data");
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return tal_free(invrequest);
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}
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*fail = check_features_and_chain(ctx,
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our_features, must_be_chain,
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invrequest->features,
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invrequest->chains);
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if (*fail)
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return tal_free(invrequest);
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return invrequest;
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}
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char *invoice_encode(const tal_t *ctx, const struct tlv_invoice *invoice_tlv)
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{
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u8 *wire;
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wire = tal_arr(tmpctx, u8, 0);
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towire_invoice(&wire, invoice_tlv);
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return to_bech32_charset(ctx, "lni", wire);
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}
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struct tlv_invoice *invoice_decode_nosig(const tal_t *ctx,
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const char *b12, size_t b12len,
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const struct feature_set *our_features,
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const struct chainparams *must_be_chain,
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char **fail)
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{
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struct tlv_invoice *invoice = tlv_invoice_new(ctx);
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const u8 *data;
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size_t dlen;
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data = string_to_data(tmpctx, b12, b12len, "lni", &dlen, fail);
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if (!data)
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return tal_free(invoice);
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if (!fromwire_invoice(&data, &dlen, invoice)) {
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*fail = tal_fmt(ctx, "invalid invoice data");
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return tal_free(invoice);
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}
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*fail = check_features_and_chain(ctx,
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our_features, must_be_chain,
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invoice->features,
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invoice->chains);
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if (*fail)
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return tal_free(invoice);
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return invoice;
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}
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struct tlv_invoice *invoice_decode(const tal_t *ctx,
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const char *b12, size_t b12len,
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const struct feature_set *our_features,
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const struct chainparams *must_be_chain,
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char **fail)
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{
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struct tlv_invoice *invoice;
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invoice = invoice_decode_nosig(ctx, b12, b12len, our_features,
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must_be_chain, fail);
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if (invoice) {
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*fail = check_signature(ctx, invoice->fields,
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"invoice", "signature",
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invoice->node_id, invoice->signature);
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if (*fail)
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invoice = tal_free(invoice);
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}
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return invoice;
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}
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