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244 lines
8.6 KiB
C
244 lines
8.6 KiB
C
#include "config.h"
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#include <common/bech32.h>
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#include <common/configdir.h>
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#include <common/json_command.h>
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#include <common/json_param.h>
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#include <errno.h>
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#include <hsmd/hsmd_wiregen.h>
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#include <lightningd/hsm_control.h>
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#include <lightningd/plugin.h>
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/* These tables copied from zbase32 src:
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* copyright 2002-2007 Zooko "Zooko" Wilcox-O'Hearn
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* mailto:zooko@zooko.com
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*
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* Permission is hereby granted to any person obtaining a copy of this work to
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* deal in this work without restriction (including the rights to use, modify,
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* distribute, sublicense, and/or sell copies).
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*/
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static const char*const zbase32_chars="ybndrfg8ejkmcpqxot1uwisza345h769";
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/* revchars: index into this table with the ASCII value of the char. The result is the value of that quintet. */
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static const u8 zbase32_revchars[]={ 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 18, 255, 25, 26, 27, 30, 29, 7, 31, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 24, 1, 12, 3, 8, 5, 6, 28, 21, 9, 10, 255, 11, 2, 16, 13, 14, 4, 22, 17, 19, 255, 20, 15, 0, 23, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, };
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static const char *to_zbase32(const tal_t *ctx, const u8 *msg, size_t srclen)
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{
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size_t outlen;
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char *out = tal_arr(ctx, char, (srclen * 8 + 4) / 5 + 1);
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outlen = 0;
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if (!bech32_convert_bits((uint8_t *)out, &outlen, 5, msg, srclen, 8, true))
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return tal_free(out);
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assert(outlen < tal_bytelen(out));
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for (size_t i = 0; i < outlen; i++)
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out[i] = zbase32_chars[(unsigned)out[i]];
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out[outlen] = '\0';
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return out;
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}
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static const u8 *from_zbase32(const tal_t *ctx, const char *msg)
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{
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u5 *u5arr;
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u8 *u8arr;
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size_t len;
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u5arr = tal_arr(tmpctx, u5, strlen(msg));
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for (size_t i = 0; i < tal_bytelen(u5arr); i++) {
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u5arr[i] = zbase32_revchars[(unsigned char)msg[i]];
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if (u5arr[i] > 31)
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return NULL;
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}
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u8arr = tal_arr(ctx, u8, (tal_bytelen(u5arr) * 5 + 7) / 8);
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len = 0;
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if (!bech32_convert_bits(u8arr, &len, 8,
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u5arr, tal_bytelen(u5arr), 5, false))
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return tal_free(u8arr);
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return len == tal_bytelen(u8arr) ? u8arr : tal_free(u8arr);
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}
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static struct command_result *json_signmessage(struct command *cmd,
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const char *buffer,
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const jsmntok_t *obj UNNEEDED,
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const jsmntok_t *params)
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{
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const char *message;
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secp256k1_ecdsa_recoverable_signature rsig;
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struct json_stream *response;
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u8 sig[65];
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const u8 *msg;
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int recid;
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if (!param(cmd, buffer, params,
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p_req("message", param_string, &message),
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NULL))
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return command_param_failed();
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if (strlen(message) > 65535)
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return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
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"Message must be < 64k");
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msg = towire_hsmd_sign_message(NULL,
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tal_dup_arr(tmpctx, u8, (u8 *)message,
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strlen(message), 0));
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msg = hsm_sync_req(tmpctx, cmd->ld, take(msg));
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if (!fromwire_hsmd_sign_message_reply(msg, &rsig))
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fatal("HSM gave bad hsm_sign_message_reply %s",
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tal_hex(msg, msg));
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secp256k1_ecdsa_recoverable_signature_serialize_compact(secp256k1_ctx,
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sig+1, &recid,
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&rsig);
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response = json_stream_success(cmd);
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json_add_hex(response, "signature", sig+1, sizeof(sig)-1);
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sig[0] = recid;
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json_add_hex(response, "recid", sig, 1);
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/* From https://twitter.com/rusty_twit/status/1182102005914800128:
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* @roasbeef & @bitconner point out that #lnd algo is:
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* zbase32(SigRec(SHA256(SHA256("Lightning Signed Message:" + msg)))).
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* zbase32 from https://philzimmermann.com/docs/human-oriented-base-32-encoding.txt
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* and SigRec has first byte 31 + recovery id, followed by 64 byte sig.
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* #specinatweet */
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sig[0] += 31;
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json_add_string(response, "zbase",
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to_zbase32(response, sig, sizeof(sig)));
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return command_success(cmd, response);
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}
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static const struct json_command json_signmessage_cmd = {
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"signmessage",
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"utility",
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json_signmessage,
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"Create a digital signature of {message}",
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};
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AUTODATA(json_command, &json_signmessage_cmd);
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struct command_and_node {
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struct command *cmd;
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struct node_id id;
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};
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/* topology tells us if it's a known node by returning details. */
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static void listnodes_done(const char *buffer,
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const jsmntok_t *toks,
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const jsmntok_t *idtok UNUSED,
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struct command_and_node *can)
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{
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struct json_stream *response;
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const jsmntok_t *t;
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t = json_get_member(buffer, toks, "result");
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if (t)
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t = json_get_member(buffer, t, "nodes");
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if (!t || t->size == 0) {
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response = json_stream_fail(can->cmd,
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SIGNMESSAGE_PUBKEY_NOT_FOUND,
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"pubkey not found in the graph");
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json_add_node_id(response, "claimed_key", &can->id);
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json_object_end(response);
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was_pending(command_failed(can->cmd, response));
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return;
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}
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response = json_stream_success(can->cmd);
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json_add_node_id(response, "pubkey", &can->id);
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json_add_bool(response, "verified", t && t->size == 1);
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was_pending(command_success(can->cmd, response));
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}
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static struct command_result *json_checkmessage(struct command *cmd,
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const char *buffer,
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const jsmntok_t *obj UNNEEDED,
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const jsmntok_t *params)
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{
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struct pubkey *pubkey, reckey;
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const u8 *u8sig;
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const char *message, *zb;
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secp256k1_ecdsa_recoverable_signature rsig;
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struct sha256_ctx sctx = SHA256_INIT;
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struct sha256_double shad;
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struct json_stream *response;
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if (!param(cmd, buffer, params,
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p_req("message", param_string, &message),
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p_req("zbase", param_string, &zb),
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p_opt("pubkey", param_pubkey, &pubkey),
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NULL))
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return command_param_failed();
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u8sig = from_zbase32(tmpctx, zb);
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if (!u8sig)
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return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
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"zbase is not valid zbase32");
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if (tal_bytelen(u8sig) != 65)
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return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
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"zbase is too %s",
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tal_bytelen(u8sig) < 65 ? "short" : "long");
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if (!secp256k1_ecdsa_recoverable_signature_parse_compact(secp256k1_ctx,
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&rsig,
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u8sig + 1,
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u8sig[0] - 31))
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return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
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"cannot parse zbase signature");
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sha256_update(&sctx, "Lightning Signed Message:",
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strlen("Lightning Signed Message:"));
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sha256_update(&sctx, message, strlen(message));
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sha256_double_done(&sctx, &shad);
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if (!secp256k1_ecdsa_recover(secp256k1_ctx, &reckey.pubkey, &rsig,
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shad.sha.u.u8)) {
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response = json_stream_success(cmd);
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json_add_bool(response, "verified", false);
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return command_success(cmd, response);
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}
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/* If they didn't specify pubkey, we only accept the signature if it's
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* in the graph (thus, they've signed something with it). This idea
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* was stolen directly from lnd, thanks @roasbeef.
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*
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* FIXME: We could also look through known invoices: AFAICT you can't
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* make two (different) signed messages with the same recovered key
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* unless you know the secret key */
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if (!pubkey) {
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struct jsonrpc_request *req;
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struct plugin *plugin;
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struct command_and_node *can = tal(cmd, struct command_and_node);
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node_id_from_pubkey(&can->id, &reckey);
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can->cmd = cmd;
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/* Only works if we have listnodes! */
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plugin = find_plugin_for_command(cmd->ld, "listnodes");
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if (plugin) {
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req = jsonrpc_request_start(cmd, "listnodes",
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cmd->id,
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plugin->non_numeric_ids,
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command_log(cmd),
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NULL, listnodes_done,
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can);
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json_add_node_id(req->stream, "id", &can->id);
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jsonrpc_request_end(req);
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plugin_request_send(plugin, req);
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return command_still_pending(cmd);
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}
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}
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response = json_stream_success(cmd);
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json_add_pubkey(response, "pubkey", &reckey);
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json_add_bool(response, "verified",
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pubkey && pubkey_eq(pubkey, &reckey));
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return command_success(cmd, response);
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}
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static const struct json_command json_checkmessage_cmd = {
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"checkmessage",
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"utility",
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json_checkmessage,
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"Verify a digital signature {zbase} of {message} signed with {pubkey}",
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};
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AUTODATA(json_command, &json_checkmessage_cmd);
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