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Diffstat (limited to 'src/test/test_sendme.c')
| -rw-r--r-- | src/test/test_sendme.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/src/test/test_sendme.c b/src/test/test_sendme.c new file mode 100644 index 0000000000..2ff4809124 --- /dev/null +++ b/src/test/test_sendme.c @@ -0,0 +1,365 @@ +/* Copyright (c) 2014-2020, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/* Unit tests for handling different kinds of relay cell */ + +#define CIRCUITLIST_PRIVATE +#define NETWORKSTATUS_PRIVATE +#define SENDME_PRIVATE +#define RELAY_PRIVATE + +#include "core/or/circuit_st.h" +#include "core/or/or_circuit_st.h" +#include "core/or/origin_circuit_st.h" +#include "core/or/circuitlist.h" +#include "core/or/relay.h" +#include "core/or/sendme.h" + +#include "feature/nodelist/networkstatus.h" +#include "feature/nodelist/networkstatus_st.h" + +#include "lib/crypt_ops/crypto_digest.h" + +#include "test/test.h" +#include "test/log_test_helpers.h" + +static void +setup_mock_consensus(void) +{ + current_md_consensus = current_ns_consensus = + tor_malloc_zero(sizeof(networkstatus_t)); + current_md_consensus->net_params = smartlist_new(); + current_md_consensus->routerstatus_list = smartlist_new(); +} + +static void +free_mock_consensus(void) +{ + SMARTLIST_FOREACH(current_md_consensus->routerstatus_list, void *, r, + tor_free(r)); + smartlist_free(current_md_consensus->routerstatus_list); + smartlist_free(current_ns_consensus->net_params); + tor_free(current_ns_consensus); +} + +static void +test_v1_record_digest(void *arg) +{ + or_circuit_t *or_circ = NULL; + circuit_t *circ = NULL; + + (void) arg; + + /* Create our dummy circuit. */ + or_circ = or_circuit_new(1, NULL); + /* Points it to the OR circuit now. */ + circ = TO_CIRCUIT(or_circ); + + /* The package window has to be a multiple of CIRCWINDOW_INCREMENT minus 1 + * in order to catched the CIRCWINDOW_INCREMENT-nth cell. Try something that + * shouldn't be noted. */ + circ->package_window = CIRCWINDOW_INCREMENT; + sendme_record_cell_digest_on_circ(circ, NULL); + tt_assert(!circ->sendme_last_digests); + + /* This should work now. Package window at CIRCWINDOW_INCREMENT + 1. */ + circ->package_window++; + sendme_record_cell_digest_on_circ(circ, NULL); + tt_assert(circ->sendme_last_digests); + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 1); + + /* Next cell in the package window shouldn't do anything. */ + circ->package_window++; + sendme_record_cell_digest_on_circ(circ, NULL); + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 1); + + /* The next CIRCWINDOW_INCREMENT should add one more digest. */ + circ->package_window = (CIRCWINDOW_INCREMENT * 2) + 1; + sendme_record_cell_digest_on_circ(circ, NULL); + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 2); + + done: + circuit_free_(circ); +} + +static void +test_v1_consensus_params(void *arg) +{ + (void) arg; + + setup_mock_consensus(); + tt_assert(current_md_consensus); + + /* Both zeroes. */ + smartlist_add(current_md_consensus->net_params, + (void *) "sendme_emit_min_version=0"); + smartlist_add(current_md_consensus->net_params, + (void *) "sendme_accept_min_version=0"); + tt_int_op(get_emit_min_version(), OP_EQ, 0); + tt_int_op(get_accept_min_version(), OP_EQ, 0); + smartlist_clear(current_md_consensus->net_params); + + /* Both ones. */ + smartlist_add(current_md_consensus->net_params, + (void *) "sendme_emit_min_version=1"); + smartlist_add(current_md_consensus->net_params, + (void *) "sendme_accept_min_version=1"); + tt_int_op(get_emit_min_version(), OP_EQ, 1); + tt_int_op(get_accept_min_version(), OP_EQ, 1); + smartlist_clear(current_md_consensus->net_params); + + /* Different values from each other. */ + smartlist_add(current_md_consensus->net_params, + (void *) "sendme_emit_min_version=1"); + smartlist_add(current_md_consensus->net_params, + (void *) "sendme_accept_min_version=0"); + tt_int_op(get_emit_min_version(), OP_EQ, 1); + tt_int_op(get_accept_min_version(), OP_EQ, 0); + smartlist_clear(current_md_consensus->net_params); + + /* Validate is the cell version is coherent with our internal default value + * and the one in the consensus. */ + smartlist_add(current_md_consensus->net_params, + (void *) "sendme_accept_min_version=1"); + /* Minimum acceptable value is 1. */ + tt_int_op(cell_version_can_be_handled(1), OP_EQ, true); + /* Minimum acceptable value is 1 so a cell version of 0 is refused. */ + tt_int_op(cell_version_can_be_handled(0), OP_EQ, false); + + done: + free_mock_consensus(); +} + +static void +test_v1_build_cell(void *arg) +{ + uint8_t payload[RELAY_PAYLOAD_SIZE], digest[DIGEST_LEN]; + ssize_t ret; + crypto_digest_t *cell_digest = NULL; + or_circuit_t *or_circ = NULL; + circuit_t *circ = NULL; + + (void) arg; + + or_circ = or_circuit_new(1, NULL); + circ = TO_CIRCUIT(or_circ); + circ->sendme_last_digests = smartlist_new(); + + cell_digest = crypto_digest_new(); + tt_assert(cell_digest); + crypto_digest_add_bytes(cell_digest, "AAAAAAAAAAAAAAAAAAAA", 20); + crypto_digest_get_digest(cell_digest, (char *) digest, sizeof(digest)); + smartlist_add(circ->sendme_last_digests, tor_memdup(digest, sizeof(digest))); + + /* SENDME v1 payload is 3 bytes + 20 bytes digest. See spec. */ + ret = build_cell_payload_v1(digest, payload); + tt_int_op(ret, OP_EQ, 23); + + /* Validation. */ + + /* An empty payload means SENDME version 0 thus valid. */ + tt_int_op(sendme_is_valid(circ, payload, 0), OP_EQ, true); + /* Current phoney digest should have been popped. */ + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 0); + + /* An unparseable cell means invalid. */ + setup_full_capture_of_logs(LOG_INFO); + tt_int_op(sendme_is_valid(circ, (const uint8_t *) "A", 1), OP_EQ, false); + expect_log_msg_containing("Unparseable SENDME cell received. " + "Closing circuit."); + teardown_capture_of_logs(); + + /* No cell digest recorded for this. */ + setup_full_capture_of_logs(LOG_INFO); + tt_int_op(sendme_is_valid(circ, payload, sizeof(payload)), OP_EQ, false); + expect_log_msg_containing("We received a SENDME but we have no cell digests " + "to match. Closing circuit."); + teardown_capture_of_logs(); + + /* Note the wrong digest in the circuit, cell should fail validation. */ + circ->package_window = CIRCWINDOW_INCREMENT + 1; + sendme_record_cell_digest_on_circ(circ, NULL); + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 1); + setup_full_capture_of_logs(LOG_INFO); + tt_int_op(sendme_is_valid(circ, payload, sizeof(payload)), OP_EQ, false); + /* After a validation, the last digests is always popped out. */ + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 0); + expect_log_msg_containing("SENDME v1 cell digest do not match."); + teardown_capture_of_logs(); + + /* Record the cell digest into the circuit, cell should validate. */ + memcpy(or_circ->crypto.sendme_digest, digest, sizeof(digest)); + circ->package_window = CIRCWINDOW_INCREMENT + 1; + sendme_record_cell_digest_on_circ(circ, NULL); + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 1); + tt_int_op(sendme_is_valid(circ, payload, sizeof(payload)), OP_EQ, true); + /* After a validation, the last digests is always popped out. */ + tt_int_op(smartlist_len(circ->sendme_last_digests), OP_EQ, 0); + + done: + crypto_digest_free(cell_digest); + circuit_free_(circ); +} + +static void +test_cell_payload_pad(void *arg) +{ + size_t pad_offset, payload_len, expected_offset; + + (void) arg; + + /* Offset should be 0, not enough room for padding. */ + payload_len = RELAY_PAYLOAD_SIZE; + pad_offset = get_pad_cell_offset(payload_len); + tt_int_op(pad_offset, OP_EQ, 0); + tt_int_op(CELL_PAYLOAD_SIZE - pad_offset, OP_LE, CELL_PAYLOAD_SIZE); + + /* Still no room because we keep 4 extra bytes. */ + pad_offset = get_pad_cell_offset(payload_len - 4); + tt_int_op(pad_offset, OP_EQ, 0); + tt_int_op(CELL_PAYLOAD_SIZE - pad_offset, OP_LE, CELL_PAYLOAD_SIZE); + + /* We should have 1 byte of padding. Meaning, the offset should be the + * CELL_PAYLOAD_SIZE minus 1 byte. */ + expected_offset = CELL_PAYLOAD_SIZE - 1; + pad_offset = get_pad_cell_offset(payload_len - 5); + tt_int_op(pad_offset, OP_EQ, expected_offset); + tt_int_op(CELL_PAYLOAD_SIZE - pad_offset, OP_LE, CELL_PAYLOAD_SIZE); + + /* Now some arbitrary small payload length. The cell size is header + 10 + + * extra 4 bytes we keep so the offset should be there. */ + expected_offset = RELAY_HEADER_SIZE + 10 + 4; + pad_offset = get_pad_cell_offset(10); + tt_int_op(pad_offset, OP_EQ, expected_offset); + tt_int_op(CELL_PAYLOAD_SIZE - pad_offset, OP_LE, CELL_PAYLOAD_SIZE); + + /* Data length of 0. */ + expected_offset = RELAY_HEADER_SIZE + 4; + pad_offset = get_pad_cell_offset(0); + tt_int_op(pad_offset, OP_EQ, expected_offset); + tt_int_op(CELL_PAYLOAD_SIZE - pad_offset, OP_LE, CELL_PAYLOAD_SIZE); + + done: + ; +} + +static void +test_cell_version_validation(void *arg) +{ + (void) arg; + + /* We currently only support up to SENDME_MAX_SUPPORTED_VERSION so we are + * going to test the boundaries there. */ + + tt_assert(cell_version_can_be_handled(SENDME_MAX_SUPPORTED_VERSION)); + + /* Version below our supported should pass. */ + tt_assert(cell_version_can_be_handled(SENDME_MAX_SUPPORTED_VERSION - 1)); + + /* Extra version from our supported should fail. */ + tt_assert(!cell_version_can_be_handled(SENDME_MAX_SUPPORTED_VERSION + 1)); + + /* Simple check for version 0. */ + tt_assert(cell_version_can_be_handled(0)); + + /* We MUST handle the default cell version that we emit or accept. */ + tt_assert(cell_version_can_be_handled(SENDME_EMIT_MIN_VERSION_DEFAULT)); + tt_assert(cell_version_can_be_handled(SENDME_ACCEPT_MIN_VERSION_DEFAULT)); + + done: + ; +} + +/* check our decisions about how much stuff to put into relay cells. */ +static void +test_package_payload_len(void *arg) +{ + (void)arg; + /* this is not a real circuit: it only has the fields needed for this + * test. */ + circuit_t *c = tor_malloc_zero(sizeof(circuit_t)); + + /* check initial conditions. */ + circuit_reset_sendme_randomness(c); + tt_assert(! c->have_sent_sufficiently_random_cell); + tt_int_op(c->send_randomness_after_n_cells, OP_GE, CIRCWINDOW_INCREMENT / 2); + tt_int_op(c->send_randomness_after_n_cells, OP_LT, CIRCWINDOW_INCREMENT); + + /* We have a bunch of cells before we need to send randomness, so the first + * few can be packaged full. */ + int initial = c->send_randomness_after_n_cells; + size_t n = connection_edge_get_inbuf_bytes_to_package(10000, 0, c); + tt_uint_op(RELAY_PAYLOAD_SIZE, OP_EQ, n); + n = connection_edge_get_inbuf_bytes_to_package(95000, 1, c); + tt_uint_op(RELAY_PAYLOAD_SIZE, OP_EQ, n); + tt_int_op(c->send_randomness_after_n_cells, OP_EQ, initial - 2); + + /* If package_partial isn't set, we won't package a partially full cell at + * all. */ + n = connection_edge_get_inbuf_bytes_to_package(RELAY_PAYLOAD_SIZE-1, 0, c); + tt_int_op(n, OP_EQ, 0); + /* no change in our state, since nothing was sent. */ + tt_assert(! c->have_sent_sufficiently_random_cell); + tt_int_op(c->send_randomness_after_n_cells, OP_EQ, initial - 2); + + /* If package_partial is set and the partial cell is not going to have + * _enough_ randomness, we package it, but we don't consider ourselves to + * have sent a sufficiently random cell. */ + n = connection_edge_get_inbuf_bytes_to_package(RELAY_PAYLOAD_SIZE-1, 1, c); + tt_int_op(n, OP_EQ, RELAY_PAYLOAD_SIZE-1); + tt_assert(! c->have_sent_sufficiently_random_cell); + tt_int_op(c->send_randomness_after_n_cells, OP_EQ, initial - 3); + + /* Make sure we set have_set_sufficiently_random_cell as appropriate. */ + n = connection_edge_get_inbuf_bytes_to_package(RELAY_PAYLOAD_SIZE-64, 1, c); + tt_int_op(n, OP_EQ, RELAY_PAYLOAD_SIZE-64); + tt_assert(c->have_sent_sufficiently_random_cell); + tt_int_op(c->send_randomness_after_n_cells, OP_EQ, initial - 4); + + /* Now let's look at what happens when we get down to zero. Since we have + * sent a sufficiently random cell, we will not force this one to have a gap. + */ + c->send_randomness_after_n_cells = 0; + n = connection_edge_get_inbuf_bytes_to_package(10000, 1, c); + tt_int_op(n, OP_EQ, RELAY_PAYLOAD_SIZE); + /* Now these will be reset. */ + tt_assert(! c->have_sent_sufficiently_random_cell); + tt_int_op(c->send_randomness_after_n_cells, OP_GE, + CIRCWINDOW_INCREMENT / 2 - 1); + + /* What would happen if we hadn't sent a sufficiently random cell? */ + c->send_randomness_after_n_cells = 0; + n = connection_edge_get_inbuf_bytes_to_package(10000, 1, c); + const size_t reduced_payload_size = RELAY_PAYLOAD_SIZE - 4 - 16; + tt_int_op(n, OP_EQ, reduced_payload_size); + /* Now these will be reset. */ + tt_assert(! c->have_sent_sufficiently_random_cell); + tt_int_op(c->send_randomness_after_n_cells, OP_GE, + CIRCWINDOW_INCREMENT / 2 - 1); + + /* Here is a fun case: if it's time to package a small cell, then + * package_partial==0 should mean we accept that many bytes. + */ + c->send_randomness_after_n_cells = 0; + n = connection_edge_get_inbuf_bytes_to_package(reduced_payload_size, 0, c); + tt_int_op(n, OP_EQ, reduced_payload_size); + + done: + tor_free(c); +} + +struct testcase_t sendme_tests[] = { + { "v1_record_digest", test_v1_record_digest, TT_FORK, + NULL, NULL }, + { "v1_consensus_params", test_v1_consensus_params, TT_FORK, + NULL, NULL }, + { "v1_build_cell", test_v1_build_cell, TT_FORK, + NULL, NULL }, + { "cell_payload_pad", test_cell_payload_pad, TT_FORK, + NULL, NULL }, + { "cell_version_validation", test_cell_version_validation, TT_FORK, + NULL, NULL }, + { "package_payload_len", test_package_payload_len, 0, NULL, NULL }, + + END_OF_TESTCASES +}; |