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322 lines
10 KiB
322 lines
10 KiB
#include <assert.h>
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#include <ccan/mem/mem.h>
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#include <ccan/opt/opt.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/str/hex/hex.h>
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#include <ccan/tal/grab_file/grab_file.h>
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#include <ccan/tal/str/str.h>
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#include <common/amount.h>
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#include <common/json.h>
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#include <common/json_helpers.h>
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#include <common/sphinx.h>
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#include <common/utils.h>
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#include <common/version.h>
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#include <err.h>
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#include <secp256k1.h>
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#include <stdio.h>
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#include <unistd.h>
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#define ASSOC_DATA_SIZE 32
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static void do_generate(int argc, char **argv,
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const u8 assocdata[ASSOC_DATA_SIZE])
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{
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const tal_t *ctx = talz(NULL, tal_t);
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int num_hops = argc - 2;
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struct pubkey *path = tal_arr(ctx, struct pubkey, num_hops);
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u8 rawprivkey[PRIVKEY_LEN];
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struct secret session_key;
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struct secret *shared_secrets;
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struct sphinx_path *sp;
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const u8* tmp_assocdata =tal_dup_arr(ctx, u8, assocdata,
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ASSOC_DATA_SIZE, 0);
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memset(&session_key, 'A', sizeof(struct secret));
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sp = sphinx_path_new_with_key(ctx, tmp_assocdata, &session_key);
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for (int i = 0; i < num_hops; i++) {
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size_t klen = strcspn(argv[2 + i], "/");
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if (hex_data_size(klen) == PRIVKEY_LEN) {
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if (!hex_decode(argv[2 + i], klen, rawprivkey, PRIVKEY_LEN))
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errx(1, "Invalid private key hex '%s'",
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argv[2 + i]);
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if (secp256k1_ec_pubkey_create(secp256k1_ctx,
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&path[i].pubkey,
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rawprivkey) != 1)
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errx(1, "Could not decode pubkey");
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} else if (hex_data_size(klen) == PUBKEY_CMPR_LEN) {
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if (!pubkey_from_hexstr(argv[2 + i], klen, &path[i]))
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errx(1, "Invalid public key hex '%s'",
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argv[2 + i]);
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} else {
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errx(1,
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"Provided key is neither a pubkey nor a privkey: "
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"%s\n",
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argv[2 + i]);
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}
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/* /<hex> -> raw hopdata. /tlv -> TLV encoding. */
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if (argv[2 + i][klen] != '\0' && argv[2 + i][klen] != 't') {
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const char *hopstr = argv[2 + i] + klen + 1;
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u8 *data = tal_hexdata(ctx, hopstr, strlen(hopstr));
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if (!data)
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errx(1, "bad hex after / in %s", argv[1 + i]);
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sphinx_add_raw_hop(sp, &path[i], SPHINX_RAW_PAYLOAD,
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data);
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} else {
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struct short_channel_id scid;
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struct amount_msat amt;
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bool use_tlv = streq(argv[1 + i] + klen, "/tlv");
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memset(&scid, i, sizeof(scid));
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amt.millisatoshis = i; /* Raw: test code */
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if (i == num_hops - 1)
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sphinx_add_final_hop(sp, &path[i],
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use_tlv,
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amt, i);
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else
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sphinx_add_nonfinal_hop(sp, &path[i],
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use_tlv,
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&scid, amt, i);
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}
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}
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struct onionpacket *res = create_onionpacket(ctx, sp, &shared_secrets);
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u8 *serialized = serialize_onionpacket(ctx, res);
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if (!serialized)
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errx(1, "Error serializing message.");
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printf("%s\n", tal_hex(ctx, serialized));
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tal_free(ctx);
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}
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static struct route_step *decode_with_privkey(const tal_t *ctx, const u8 *onion, char *hexprivkey, const u8 *assocdata)
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{
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struct privkey seckey;
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struct route_step *step;
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struct onionpacket *packet;
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enum onion_type why_bad;
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u8 shared_secret[32];
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if (!hex_decode(hexprivkey, strlen(hexprivkey), &seckey, sizeof(seckey)))
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errx(1, "Invalid private key hex '%s'", hexprivkey);
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packet = parse_onionpacket(ctx, onion, TOTAL_PACKET_SIZE, &why_bad);
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if (!packet)
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errx(1, "Error parsing message: %s", onion_type_name(why_bad));
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if (!onion_shared_secret(shared_secret, packet, &seckey))
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errx(1, "Error creating shared secret.");
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step = process_onionpacket(ctx, packet, shared_secret, assocdata,
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tal_bytelen(assocdata));
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return step;
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}
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static void do_decode(int argc, char **argv, const u8 assocdata[ASSOC_DATA_SIZE])
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{
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const tal_t *ctx = talz(NULL, tal_t);
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u8 serialized[TOTAL_PACKET_SIZE];
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struct route_step *step;
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if (argc != 4)
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opt_usage_exit_fail("Expect an filename and privkey with 'decode' method");
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char *hextemp = grab_file(ctx, argv[2]);
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size_t hexlen = strlen(hextemp);
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// trim trailing whitespace
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while (isspace(hextemp[hexlen-1]))
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hexlen--;
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if (!hex_decode(hextemp, hexlen, serialized, sizeof(serialized))) {
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errx(1, "Invalid onion hex '%s'", hextemp);
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}
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const u8* tmp_assocdata =tal_dup_arr(ctx, u8, assocdata,
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ASSOC_DATA_SIZE, 0);
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step = decode_with_privkey(ctx, serialized, tal_strdup(ctx, argv[3]), tmp_assocdata);
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if (!step || !step->next)
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errx(1, "Error processing message.");
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printf("payload=%s\n", tal_hex(ctx, step->raw_payload));
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if (step->nextcase == ONION_FORWARD) {
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u8 *ser = serialize_onionpacket(ctx, step->next);
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if (!ser)
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errx(1, "Error serializing message.");
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printf("next=%s\n", tal_hex(ctx, ser));
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}
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tal_free(ctx);
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}
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static char *opt_set_ad(const char *arg, u8 *assocdata)
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{
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if (!hex_decode(arg, strlen(arg), assocdata, ASSOC_DATA_SIZE))
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return "Bad hex string";
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return NULL;
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}
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static void opt_show_ad(char buf[OPT_SHOW_LEN], const u8 *assocdata)
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{
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hex_encode(assocdata, ASSOC_DATA_SIZE, buf, OPT_SHOW_LEN);
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}
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/**
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* Run an onion encoding/decoding unit-test from a file
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*/
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static void runtest(const char *filename)
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{
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const tal_t *ctx = tal(NULL, u8);
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bool valid;
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char *buffer = grab_file(ctx, filename);
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const jsmntok_t *toks, *session_key_tok, *associated_data_tok, *gentok,
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*hopstok, *hop, *payloadtok, *pubkeytok, *typetok, *oniontok, *decodetok;
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const u8 *associated_data, *session_key_raw, *payload, *serialized, *onion;
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struct secret session_key, *shared_secrets;
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struct pubkey pubkey;
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struct sphinx_path *path;
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size_t i;
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enum sphinx_payload_type type;
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struct onionpacket *res;
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struct route_step *step;
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char *hexprivkey;
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toks = json_parse_input(ctx, buffer, strlen(buffer), &valid);
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if (!valid)
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errx(1, "File is not a valid JSON file.");
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gentok = json_get_member(buffer, toks, "generate");
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if (!gentok)
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errx(1, "JSON object does not contain a 'generate' key");
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/* Unpack the common parts */
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associated_data_tok = json_get_member(buffer, gentok, "associated_data");
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session_key_tok = json_get_member(buffer, gentok, "session_key");
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associated_data = json_tok_bin_from_hex(ctx, buffer, associated_data_tok);
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session_key_raw = json_tok_bin_from_hex(ctx, buffer, session_key_tok);
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memcpy(&session_key, session_key_raw, sizeof(session_key));
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path = sphinx_path_new_with_key(ctx, associated_data, &session_key);
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/* Unpack the hops and build up the path */
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hopstok = json_get_member(buffer, gentok, "hops");
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json_for_each_arr(i, hop, hopstok) {
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payloadtok = json_get_member(buffer, hop, "payload");
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typetok = json_get_member(buffer, hop, "type");
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pubkeytok = json_get_member(buffer, hop, "pubkey");
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payload = json_tok_bin_from_hex(ctx, buffer, payloadtok);
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json_to_pubkey(buffer, pubkeytok, &pubkey);
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if (!typetok || json_tok_streq(buffer, typetok, "legacy")) {
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type = SPHINX_V0_PAYLOAD;
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} else {
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type = SPHINX_RAW_PAYLOAD;
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}
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sphinx_add_raw_hop(path, &pubkey, type, payload);
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}
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res = create_onionpacket(ctx, path, &shared_secrets);
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serialized = serialize_onionpacket(ctx, res);
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if (!serialized)
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errx(1, "Error serializing message.");
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oniontok = json_get_member(buffer, toks, "onion");
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if (oniontok) {
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onion = json_tok_bin_from_hex(ctx, buffer, oniontok);
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if (!memeq(onion, tal_bytelen(onion), serialized,
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tal_bytelen(serialized)))
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errx(1,
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"Generated does not match the expected onion: \n"
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"generated: %s\n"
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"expected : %s\n",
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tal_hex(ctx, serialized), tal_hex(ctx, onion));
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}
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printf("Generated onion: %s\n", tal_hex(ctx, serialized));
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decodetok = json_get_member(buffer, toks, "decode");
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json_for_each_arr(i, hop, decodetok) {
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hexprivkey = json_strdup(ctx, buffer, hop);
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printf("Processing at hop %zu\n", i);
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step = decode_with_privkey(ctx, serialized, hexprivkey, associated_data);
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serialized = serialize_onionpacket(ctx, step->next);
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if (!serialized)
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errx(1, "Error serializing message.");
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printf(" Type: %d\n", step->type);
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printf(" Payload: %s\n", tal_hex(ctx, step->raw_payload));
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printf(" Next onion: %s\n", tal_hex(ctx, serialized));
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printf(" Next HMAC: %s\n", tal_hexstr(ctx, step->next->mac, HMAC_SIZE));
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}
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tal_free(ctx);
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}
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/* Tal wrappers for opt. */
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static void *opt_allocfn(size_t size)
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{
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return tal_arr_label(NULL, char, size, TAL_LABEL("opt_allocfn", ""));
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}
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static void *tal_reallocfn(void *ptr, size_t size)
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{
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if (!ptr)
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return opt_allocfn(size);
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tal_resize_(&ptr, 1, size, false);
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return ptr;
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}
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static void tal_freefn(void *ptr)
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{
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tal_free(ptr);
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}
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int main(int argc, char **argv)
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{
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setup_locale();
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const char *method;
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u8 assocdata[ASSOC_DATA_SIZE];
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memset(&assocdata, 'B', sizeof(assocdata));
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secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY |
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SECP256K1_CONTEXT_SIGN);
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opt_set_alloc(opt_allocfn, tal_reallocfn, tal_freefn);
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opt_register_arg("--assoc-data", opt_set_ad, opt_show_ad,
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assocdata,
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"Associated data (usu. payment_hash of payment)");
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opt_register_noarg("--help|-h", opt_usage_and_exit,
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"\n\n\tdecode <onion_file> <privkey>\n"
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"\tgenerate <pubkey1> <pubkey2> ...\n"
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"\tgenerate <pubkey1>[/hopdata|/tlv] <pubkey2>[/hopdata|/tlv]\n"
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"\tgenerate <privkey1>[/hopdata|/tlv] <privkey2>[/hopdata|/tlv]\n"
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"\truntest <test-filename>\n\n", "Show this message\n\n"
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"\texample:\n"
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"\t> onion generate 02c18e7ff9a319983e85094b8c957da5c1230ecb328c1f1c7e88029f1fec2046f8/00000000000000000000000000000f424000000138000000000000000000000000 --assoc-data 44ee26f01e54665937b892f6afbfdfb88df74bcca52d563f088668cf4490aacd > onion.dat\n"
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"\t> onion decode onion.dat 78302c8edb1b94e662464e99af721054b6ab9d577d3189f933abde57709c5cb8 --assoc-data 44ee26f01e54665937b892f6afbfdfb88df74bcca52d563f088668cf4490aacd\n");
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opt_register_version();
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opt_early_parse(argc, argv, opt_log_stderr_exit);
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opt_parse(&argc, argv, opt_log_stderr_exit);
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if (argc < 2)
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errx(1, "You must specify a method");
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method = argv[1];
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if (streq(method, "runtest")) {
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if (argc != 3)
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errx(1, "'runtest' requires a filename argument");
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runtest(argv[2]);
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} else if (streq(method, "generate")) {
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do_generate(argc, argv, assocdata);
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} else if (streq(method, "decode")) {
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do_decode(argc, argv, assocdata);
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} else {
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errx(1, "Unrecognized method '%s'", method);
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}
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return 0;
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}
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