111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/* This is a fuzz test for Act 3 of the BOLT 8 handshake. We intercept io_read()
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* to inject the fuzzer-generated Act 3 packet in the handshake.
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*
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* The expected sequence of events for this test is:
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* 1. initiator calls io_write() with an Act 1 packet
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* - we save the valid Act 1 packet and fail the handshake
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* 2. responder calls io_read() for the Act 1 packet
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* - we inject the valid Act 1 packet from Step 1
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* 3. responder calls io_write() with an Act 2 packet
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* - we discard the valid Act 2 packet
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* 4. responder calls io_read() for the Act 3 packet
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* - we inject the fuzzer-generated packet
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* 5. responder fails to validate the packet
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*/
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#include "config.h"
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#include <assert.h>
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#include <ccan/io/io.h>
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#include <ccan/mem/mem.h>
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#include <common/utils.h>
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#include <tests/fuzz/connectd_handshake.h>
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#include <tests/fuzz/libfuzz.h>
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/* Storage for the valid Act 1 packet extracted from the initiator. */
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static u8 act_one[ACT_ONE_SIZE];
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/* The io_write() interceptor.
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*
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* This should be called once when the initiator is writing out its Act 1
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* packet and once when the responder is writing out its Act 2 packet. */
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static struct io_plan *
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test_write(struct io_conn *conn, const void *data, size_t len,
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struct io_plan *(*next)(struct io_conn *, struct handshake *),
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struct handshake *h)
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{
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++write_count;
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if (write_count == 1) {
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/* Initiator is sending the Act 1 packet. Save it for the
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* responder and then error out. */
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assert(h->side == INITIATOR);
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assert(len == sizeof(act_one));
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memcpy(act_one, data, sizeof(act_one));
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return handshake_failed(conn, h);
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}
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if (write_count == 2) {
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/* Responder is sending the Act 2 packet. Check that it is
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* initialized and discard it. */
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assert(h->side == RESPONDER);
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assert(len == ACT_TWO_SIZE);
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memcheck(data, len);
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return next(conn, h);
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}
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assert(false && "too many calls to io_write()");
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}
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/* The io_read() interceptor.
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*
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* This should be called once when the responder is reading the Act 1 packet and
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* once when the responder is reading the Act 3 packet. We inject fuzzer input
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* for the Act 3 packet. */
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static struct io_plan *test_read(struct io_conn *conn, void *data, size_t len,
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struct io_plan *(*next)(struct io_conn *,
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struct handshake *),
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struct handshake *h)
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{
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++read_count;
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if (read_count == 1) {
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/* Responder is reading the Act 1 packet. Use the packet
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* provided by the initiator. */
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assert(h->side == RESPONDER);
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assert(len == sizeof(act_one));
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assert(write_count == 1 &&
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"initiator didn't send Act 1 packet");
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memcpy(data, act_one, sizeof(act_one));
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return next(conn, h);
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}
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if (read_count == 2) {
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/* Responder is reading the Act 3 packet. Provide the
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* fuzzer-generated data as the packet. */
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assert(h->side == RESPONDER);
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assert(len == ACT_THREE_SIZE);
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assert(bytes_remaining >= len);
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memcpy(data, bytes, len);
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bytes += len;
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bytes_remaining -= len;
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return next(conn, h);
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}
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assert(false && "too many calls to io_read()");
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}
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void run(const u8 *data, size_t size)
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{
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if (size < randombytes_SEEDBYTES + ACT_THREE_SIZE)
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return;
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init_globals(data, size);
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/* Do the initiator handshake up to Act 1 so we can extract the valid
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* Act 1 packet. */
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handshake(INITIATOR);
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/* Do the responder handshake using the initiator's Act 1 packet and the
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* fuzzer-generated Act 3 packet. */
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handshake(RESPONDER);
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clean_tmpctx();
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}
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