#include "fuzz_handshake_harness.h"

#include "fuzz_handshake_expose.h"

#include <string.h>

#include <dlfcn.h>

#include <dds/features.h>

#include <dds__types.h>

#include <dds__init.h>

#include <dds__domain.h>

#include <ddsi__addrset.h>

#include <ddsi__handshake.h>

#include <ddsi__thread.h>

#include <ddsi__plist.h>

#include <ddsi__proxy_participant.h>

#include <ddsi__vendor.h>

#include <ddsi__protocol.h>

#include <ddsi__security_util.h>

#include <ddsi__xevent.h>

#include <ddsi__gc.h>

#include <dds__qos.h>

#include <dds/ddsi/ddsi_iid.h>

#include <dds/ddsi/ddsi_init.h>

#include <dds/ddsi/ddsi_participant.h>

#include <dds/ddsi/ddsi_entity_index.h>

#include <dds/ddsi/ddsi_unused.h>

#include <ddsi__security_omg.h>

#include <dds/security/core/dds_security_fsm.h>

#include <dds/security/core/dds_security_utils.h>

#include <dds/security/core/dds_security_serialize.h>

#include <dds/ddsrt/heap.h>

#include <dds/ddsrt/string.h>

#include <common/test_identity.h>

#include <openssl/pem.h>

const char *sec_config =

    "<Domain id=\"any\">"

    "  <Discovery>"

    "    <Tag>${CYCLONEDDS_PID}</Tag>"

    "  </Discovery>"

    "  <Tracing><Verbosity>finest</></>"

    "  <Security>"

    "    <Authentication>"

    "      <Library initFunction=\"init_authentication\" finalizeFunction=\"finalize_authentication\" path=\"dds_security_auth\"/>"

    "      <IdentityCertificate>data:," TEST_IDENTITY1_CERTIFICATE "</IdentityCertificate>"

    "      <PrivateKey>data:," TEST_IDENTITY1_PRIVATE_KEY "</PrivateKey>"

    "      <IdentityCA>data:," TEST_IDENTITY_CA1_CERTIFICATE "</IdentityCA>"

    "    </Authentication>"

    "    <Cryptographic>"

    "      <Library initFunction=\"init_crypto\" finalizeFunction=\"finalize_crypto\" path=\"dds_security_crypto\"/>"

    "    </Cryptographic>"

    "    <AccessControl>"

    "      <Library initFunction=\"init_access_control\" finalizeFunction=\"finalize_access_control\" path=\"dds_security_ac\"/>"

    "      <Governance></Governance>"

    "      <PermissionsCA></PermissionsCA>"

    "      <Permissions></Permissions>"

    "    </AccessControl>"

    "  </Security>"

    "</Domain>";

struct ddsi_cfgst *g_cfgst;

struct ddsi_guid g_ppguid;

struct ddsi_guid g_proxy_ppguid;

static struct ddsi_thread_state *thrst;

static struct ddsi_domaingv gv;

EVP_PKEY *g_private_key;

#define FUZZ_HANDSHAKE_EVENT_HANDLED (-4)

ddsrt_atomic_uint32_t g_fsm_done;

ddsrt_atomic_uint32_t g_fuzz_events;

static ddsrt_dynlib_t auth_plugin_handle;

typedef DDS_Security_ValidationResult_t (*dhpkey2oct_t)(EVP_PKEY *, int, unsigned char **, uint32_t *, DDS_Security_SecurityException *);

static dhpkey2oct_t dh_public_key_to_oct_ptr = NULL;

typedef DDS_Security_ValidationResult_t (*gendhkeys_t)(EVP_PKEY **, int, DDS_Security_SecurityException *);

static gendhkeys_t generate_dh_keys_ptr = NULL;

typedef DDS_Security_ValidationResult_t (*cvas_t)(bool, EVP_PKEY *, const unsigned char *, const size_t, unsigned char **, size_t *, DDS_Security_SecurityException *);

static cvas_t create_validate_asymmetrical_signature_ptr = NULL;

struct {

    struct ddsi_participant *pp;

    struct ddsi_proxy_participant *proxy_pp;

    struct ddsi_handshake *hs;

} harness;

bool fuzz_handshake_init()

{

    // Load private key for remote identity

    BIO *bio;

    bio = BIO_new_mem_buf(TEST_IDENTITY3_PRIVATE_KEY, -1);

    if (!bio) abort();

    g_private_key = PEM_read_bio_PrivateKey(bio, NULL, NULL, "");

    if (!g_private_key) abort();

    BIO_free(bio);

    //ddsi_iid_init();

    ddsi_thread_states_init();

    // register the main thread, then claim it as spawned by Cyclone because the

    // internal processing has various asserts that it isn't an application thread

    // doing the dirty work

    thrst = ddsi_lookup_thread_state ();

    assert (thrst->state == DDSI_THREAD_STATE_LAZILY_CREATED);

    thrst->state = DDSI_THREAD_STATE_ALIVE;

    thrst->vtime.v = 0;

    ddsrt_atomic_stvoidp (&thrst->gv, &gv);

    memset(&gv, 0, sizeof(gv));

    ddsi_config_init_default(&gv.config);

    gv.config.transport_selector = DDSI_TRANS_NONE;

    ddsi_config_domain_init(&gv, NULL);

    ddsi_init(&gv, NULL);

    gv.handshake_include_optional = true;

    g_cfgst = ddsi_config_init(sec_config, &gv.config, 1);

    //FILE *fp = fopen("/dev/stdout", "w");

    //dds_log_cfg_init(&gv.logconfig, 1, DDS_LC_TRACE | DDS_LC_ERROR | DDS_LC_WARNING, NULL, fp);

    // Disable logging

    dds_log_cfg_init(&gv.logconfig, 1, 0, NULL, NULL);

    // We use a statically linked build, all functions we need to lookup need to be

    // exported from the plugin

    //

    // See src/security/builtin_plugins/authentication/CMakeLists.txt

    if (ddsrt_dlopen("dds_security_auth", true, &auth_plugin_handle) != DDS_RETCODE_OK)

      abort();

    if (ddsrt_dlsym(auth_plugin_handle, "generate_dh_keys", (void **)&generate_dh_keys_ptr) != DDS_RETCODE_OK)

      abort();

    if (ddsrt_dlsym(auth_plugin_handle, "dh_public_key_to_oct", (void **)&dh_public_key_to_oct_ptr) != DDS_RETCODE_OK)

      abort();

    if (ddsrt_dlsym(auth_plugin_handle, "create_validate_asymmetrical_signature", (void **)&create_validate_asymmetrical_signature_ptr) != DDS_RETCODE_OK)

      abort();

    // Create participant

    ddsi_thread_state_awake(ddsi_lookup_thread_state(), &gv);

    {

        ddsi_plist_t pplist;

        ddsi_plist_init_empty(&pplist);

        dds_qos_t *new_qos = dds_create_qos();

        ddsi_xqos_mergein_missing (new_qos, &gv.default_local_xqos_pp, ~(uint64_t)0);

        dds_apply_entity_naming(new_qos, NULL, &gv);

        ddsi_xqos_mergein_missing (&pplist.qos, new_qos, ~(uint64_t)0);

        dds_delete_qos(new_qos);

        ddsi_generate_participant_guid (&g_ppguid, &gv);

        dds_return_t ret = ddsi_new_participant(&g_ppguid, &gv, 0, &pplist);

        if(ret != DDS_RETCODE_OK) abort();

        harness.pp = ddsi_entidx_lookup_participant_guid(gv.entity_index, &g_ppguid);

        ddsi_plist_fini(&pplist);

    }

    ddsi_thread_state_asleep(ddsi_lookup_thread_state());

    return true;

}

static void hs_end_cb(UNUSED_ARG(struct ddsi_handshake *handshake),

                      UNUSED_ARG(struct ddsi_participant *pp),

                      UNUSED_ARG(struct ddsi_proxy_participant *proxy_pp),

                      UNUSED_ARG(enum ddsi_handshake_state state))

{

    //printf("HANDSHAKE END: %d\n", state); fflush(stdout);

}

static void fsm_debug_func(UNUSED_ARG(struct dds_security_fsm *fsm), DDS_SECURITY_FSM_DEBUG_ACT act, UNUSED_ARG(const dds_security_fsm_state *current), int event_id, UNUSED_ARG(void *arg))

{

    // This event is never generated by the state machine.

    // The fuzzer throws it in at the end of its events to signal that it's done

    // and the handshake can be abandoned.

    if (act == DDS_SECURITY_FSM_DEBUG_ACT_HANDLING && event_id == DDS_SECURITY_FSM_EVENT_DELETE) {

        ddsrt_atomic_st32(&g_fsm_done, 1);

    }

    // This event is used to serialize the fuzzer, as the state machine is driven by a

    // separate thread. The fuzzer generates events and waits for the state machine to

    // finish the resulting transition. This prevents triggering any race conditions which

    // may result from a bug in the fuzzing harness. Further, the handshake data structures

    // containing the messages from a remote participant are being reused, so overwriting them

    // before the state machine handled a message will lead nowhere. Lastly, the harness does

    // not need to concern itself with locking.

    if (act == DDS_SECURITY_FSM_DEBUG_ACT_HANDLING && event_id == FUZZ_HANDSHAKE_EVENT_HANDLED) {

        ddsrt_atomic_inc32(&g_fuzz_events);

    }

}

void fuzz_handshake_reset(bool initiate_remote) {

    ddsrt_atomic_st32(&g_fsm_done, 0);

    ddsrt_atomic_st32(&g_fuzz_events, 0);

    // Create proxy participant

    ddsi_plist_t pplist;

    ddsi_plist_init_empty(&pplist);

    pplist.present |= PP_IDENTITY_TOKEN;

    ddsi_token_t identity_token = {

        .class_id = ddsrt_strdup(DDS_SECURITY_AUTH_TOKEN_CLASS_ID),

        .properties = {

            .n = 0,

            .props = NULL

        },

        .binary_properties = {

            .n = 0,

            .props = NULL

        }

    };

    pplist.identity_token = identity_token;

    union { uint64_t u64; uint32_t u32[2]; } u;

    u.u32[0] = gv.ppguid_base.prefix.u[1];

    u.u32[1] = gv.ppguid_base.prefix.u[2];

    u.u64 += ddsi_iid_gen ();

    g_proxy_ppguid.prefix.u[0] = gv.ppguid_base.prefix.u[0];

    g_proxy_ppguid.prefix.u[1] = u.u32[0];

    g_proxy_ppguid.prefix.u[2] = u.u32[1];

    g_proxy_ppguid.entityid.u = DDSI_ENTITYID_PARTICIPANT;

    if (!initiate_remote) {

        g_proxy_ppguid.prefix.s[0] = 0xff;

        g_proxy_ppguid.prefix.s[1] = 0xff;

        g_proxy_ppguid.prefix.s[2] = 0xff;

    } else {

        g_proxy_ppguid.prefix.s[0] = 0x00;

        g_proxy_ppguid.prefix.s[1] = 0x00;

        g_proxy_ppguid.prefix.s[2] = 0x00;

    }

    ddsrt_wctime_t timestamp = { .v = dds_time() };

    // We avoid generating network traffic by using DDSI_TRANS_NONE

    // This is the only valid locator for that "network".

    const ddsi_locator_t loc = {

      .kind = 2147483647, .address = {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, .port = 0

    };

    struct ddsi_addrset *as = ddsi_new_addrset();

    ddsi_add_locator_to_addrset(&gv,as, &loc, gv.xmit_conns_data);

    assert(!ddsi_addrset_empty_uc(as));

    ddsi_thread_state_awake(ddsi_lookup_thread_state(), &gv);

    if (!ddsi_new_proxy_participant(&harness.proxy_pp, &gv,

            &g_proxy_ppguid,

            DDSI_DISC_BUILTIN_ENDPOINT_PARTICIPANT_SECURE_ANNOUNCER|

            DDSI_BUILTIN_ENDPOINT_PARTICIPANT_STATELESS_MESSAGE_ANNOUNCER|DDSI_BUILTIN_ENDPOINT_PARTICIPANT_STATELESS_MESSAGE_DETECTOR,

            as,

            ddsi_ref_addrset(as),

            &pplist,

            DDS_INFINITY,

            DDSI_VENDORID_ECLIPSE,

            timestamp,

            0)) {

        abort();

    }

    ddsi_thread_state_asleep(ddsi_lookup_thread_state());

    ddsi_plist_fini(&pplist);

    harness.hs = ddsi_handshake_find(harness.pp, harness.proxy_pp);

    if (harness.hs == NULL) abort();

    // We abuse the debug function for the serialization of the fuzzer thread

    // and the handshake fsm thread.

    dds_security_fsm_set_debug(harness.hs->fsm, fsm_debug_func);

    harness.hs->end_cb = hs_end_cb;

    ddsi_handshake_release(harness.hs);

}

void fuzz_handshake_handle_timeout(void) {

    dds_security_fsm_dispatch(harness.hs->fsm, DDS_SECURITY_FSM_EVENT_TIMEOUT, false);

}

static DDS_Security_ValidationResult_t create_dh_key(int algo, unsigned char **data, uint32_t *len) {

    EVP_PKEY *key;

    DDS_Security_SecurityException ex = {0};

    DDS_Security_ValidationResult_t result = generate_dh_keys_ptr(&key, algo, &ex);

    if (result != DDS_SECURITY_VALIDATION_OK) goto out;

    result = dh_public_key_to_oct_ptr(key, algo, data, len, &ex);

out:

    EVP_PKEY_free(key);

    DDS_Security_Exception_reset(&ex);

    return result;

}

void fuzz_handshake_handle_request(ddsi_dataholder_t *token) {

    struct ddsi_participant_generic_message msg;

    msg.message_class_id = DDS_SECURITY_AUTH_HANDSHAKE;

    msg.message_data.n = 1;

    msg.message_data.tags = token;

    token->class_id = DDS_SECURITY_AUTH_HANDSHAKE_REQUEST_TOKEN_ID;

    for (uint32_t i = 0; i < token->binary_properties.n; i++) {

        dds_binaryproperty_t *binprop = &token->binary_properties.props[i];

        // To avoid fuzzing openssl, always use a valid certificate

        if (strcmp(binprop->name, "c.id") == 0) {

            ddsrt_free(binprop->value.value);

            binprop->value.length = strlen(TEST_IDENTITY3_CERTIFICATE);

            binprop->value.value = (unsigned char *) ddsrt_strdup(TEST_IDENTITY3_CERTIFICATE);

        }

        // Provide a valid dh public key

        if (strcmp(binprop->name, "dh1") == 0) {

            unsigned char *data;

            uint32_t len;

            if (create_dh_key(1, &data, &len) == DDS_SECURITY_VALIDATION_OK) {

                ddsrt_free(binprop->value.value);

                binprop->value.length = len;

                binprop->value.value = data;

            }

        }

    }

    ddsi_handshake_handle_message(harness.hs, harness.pp, harness.proxy_pp, &msg);

}

static void create_signature(const DDS_Security_BinaryProperty_t **bprops, uint32_t n_bprops, unsigned char **signature, size_t *signatureLen)

{

    unsigned char *buffer;

    size_t size;

    DDS_Security_Serializer serializer = DDS_Security_Serializer_new(4096, 4096);

    DDS_Security_Serialize_BinaryPropertyArray(serializer, bprops, n_bprops);

    DDS_Security_Serializer_buffer(serializer, &buffer, &size);

    DDS_Security_SecurityException ex;

    (void) create_validate_asymmetrical_signature_ptr(true, g_private_key, buffer, size, signature, signatureLen, &ex);

    ddsrt_free(buffer);

    DDS_Security_Serializer_free(serializer);

}

static void create_hash(const DDS_Security_DataHolder *dh, DDS_Security_BinaryProperty_t *bprop, const char *name)

{

    unsigned char *buffer;

    size_t size;

    DDS_Security_BinaryProperty_t *tokens = DDS_Security_BinaryPropertySeq_allocbuf(5);

    const DDS_Security_BinaryProperty_t *c_id = DDS_Security_DataHolder_find_binary_property(dh, "c.id");

    uint32_t tokidx = 0;

    if (c_id) DDS_Security_BinaryProperty_copy(&tokens[tokidx++], c_id);

    const DDS_Security_BinaryProperty_t *c_perm = DDS_Security_DataHolder_find_binary_property(dh, "c.perm");

    if (c_perm) DDS_Security_BinaryProperty_copy(&tokens[tokidx++], c_perm);

    const DDS_Security_BinaryProperty_t *c_pdata = DDS_Security_DataHolder_find_binary_property(dh, "c.pdata");

    if (c_pdata) DDS_Security_BinaryProperty_copy(&tokens[tokidx++], c_pdata);

    const DDS_Security_BinaryProperty_t *c_dsign_algo = DDS_Security_DataHolder_find_binary_property(dh, "c.dsign_algo");

    if (c_dsign_algo) DDS_Security_BinaryProperty_copy(&tokens[tokidx++], c_dsign_algo);

    const DDS_Security_BinaryProperty_t *c_kagree_algo = DDS_Security_DataHolder_find_binary_property(dh, "c.kagree_algo");

    if (c_kagree_algo) DDS_Security_BinaryProperty_copy(&tokens[tokidx++], c_kagree_algo);

    DDS_Security_BinaryPropertySeq seq = { ._length = tokidx, ._buffer = tokens };

    DDS_Security_Serializer serializer = DDS_Security_Serializer_new(4096, 4096);

    DDS_Security_Serialize_BinaryPropertySeq(serializer, &seq);

    DDS_Security_Serializer_buffer(serializer, &buffer, &size);

    unsigned char *hash = ddsrt_malloc(SHA256_DIGEST_LENGTH);

    SHA256(buffer, size, hash);

    ddsrt_free(buffer);

    DDS_Security_Serializer_free(serializer);

    bprop->name = ddsrt_strdup(name);

    bprop->value._length = SHA256_DIGEST_LENGTH;

    bprop->value._maximum = SHA256_DIGEST_LENGTH;

    bprop->value._buffer = hash;

    DDS_Security_BinaryPropertySeq_deinit(&seq);

}

void fuzz_handshake_handle_reply(ddsi_dataholder_t *token) {

    struct ddsi_participant_generic_message msg;

    msg.message_class_id = DDS_SECURITY_AUTH_HANDSHAKE;

    msg.message_data.n = 1;

    msg.message_data.tags = token;

    token->class_id = DDS_SECURITY_AUTH_HANDSHAKE_REPLY_TOKEN_ID;

    const DDS_Security_BinaryProperty_t *c1 = NULL;

    const DDS_Security_BinaryProperty_t *c2 = NULL;

    const DDS_Security_BinaryProperty_t *dh1 = NULL;

    const DDS_Security_BinaryProperty_t *dh2 = NULL;

    const DDS_Security_BinaryProperty_t *hash_c1 = NULL;

    const DDS_Security_BinaryProperty_t *kagree_algo = NULL;

    if (harness.hs->handshake_message_out != NULL) {

        // Using gv.handshake_include_optional = true;

        c1 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "challenge1");

        dh1 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "dh1");

        hash_c1 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "hash_c1");

        kagree_algo = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "c.kagree_algo");

    }

    // First fix up the values necessary for the hash

    for (uint32_t i = 0; i < token->binary_properties.n; i++) {

        dds_binaryproperty_t *binprop = &token->binary_properties.props[i];

        // To avoid fuzzing openssl, always use a valid certificate

        if (strcmp(binprop->name, "c.id") == 0) {

            ddsrt_free(binprop->value.value);

            binprop->value.length = strlen(TEST_IDENTITY3_CERTIFICATE);

            binprop->value.value = (unsigned char *) ddsrt_strdup(TEST_IDENTITY3_CERTIFICATE);

        }

        if ((strcmp(binprop->name, "challenge1") == 0) && c1) {

            ddsrt_free(binprop->value.value);

            binprop->value.length = DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE;

            binprop->value.value = ddsrt_malloc(DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE);

            memcpy(binprop->value.value, c1->value._buffer, DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE);

        }

        // Provide a valid dh public key

        if ((strcmp(binprop->name, "dh2") == 0) && kagree_algo) {

            int algo = 1;

            if (strncmp((const char *)kagree_algo->value._buffer, "ECDH+prime256v1-CEUM", kagree_algo->value._length) == 0) algo = 2;

            unsigned char *data;

            uint32_t len;

            if (create_dh_key(algo, &data, &len) == DDS_SECURITY_VALIDATION_OK) {

                ddsrt_free(binprop->value.value);

                binprop->value.length = len;

                binprop->value.value = data;

            }

        }

    }

    // Generate the hash to be signed

    DDS_Security_DataHolder token_holder;

    ddsi_omg_shallow_copyin_DataHolder(&token_holder, token);

    c2 = DDS_Security_DataHolder_find_binary_property(&token_holder, "challenge2");

    dh2 = DDS_Security_DataHolder_find_binary_property(&token_holder, "dh2");

    DDS_Security_BinaryProperty_t hash_c2 = {0};

    create_hash(&token_holder, &hash_c2, "hash_c2");

    for (uint32_t i = 0; i < token->binary_properties.n; i++) {

        dds_binaryproperty_t *binprop = &token->binary_properties.props[i];

        // Need to provide a valid signature for the handshake to succeed

        if (strcmp(binprop->name, "signature") == 0 && hash_c1 && c1 && c2 && dh1 && c2 && dh2 && hash_c2.value._buffer) {

            unsigned char *signature;

            size_t signatureLen;

            const DDS_Security_BinaryProperty_t *bprops[] = { &hash_c2, c2, dh2, c1, dh1, hash_c1};

            create_signature(bprops, 6, &signature, &signatureLen);

            ddsrt_free(binprop->value.value);

            binprop->value.length = (uint32_t) signatureLen;

            binprop->value.value = signature;

        }

    }

    DDS_Security_BinaryProperty_deinit(&hash_c2);

    ddsi_handshake_handle_message(harness.hs, harness.pp, harness.proxy_pp, &msg);

    ddsi_omg_shallow_free_DataHolder(&token_holder);

}

void fuzz_handshake_handle_final(ddsi_dataholder_t *token) {

    struct ddsi_participant_generic_message msg;

    msg.message_class_id = DDS_SECURITY_AUTH_HANDSHAKE;

    msg.message_data.n = 1;

    msg.message_data.tags = token;

    token->class_id = DDS_SECURITY_AUTH_HANDSHAKE_FINAL_TOKEN_ID;

    const DDS_Security_BinaryProperty_t *c1 = NULL;

    const DDS_Security_BinaryProperty_t *c2 = NULL;

    const DDS_Security_BinaryProperty_t *dh1 = NULL;

    const DDS_Security_BinaryProperty_t *dh2 = NULL;

    const DDS_Security_BinaryProperty_t *hash_c1 = NULL;

    const DDS_Security_BinaryProperty_t *hash_c2 = NULL;

    if (harness.hs->handshake_message_out != NULL) {

        // Using gv.handshake_include_optional = true;

        c1 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "challenge1");

        c2 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "challenge2");

        dh1 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "dh1");

        dh2 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "dh2");

        hash_c1 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "hash_c1");

        hash_c2 = DDS_Security_DataHolder_find_binary_property(harness.hs->handshake_message_out, "hash_c2");

    }

    for (uint32_t i = 0; i < token->binary_properties.n; i++) {

        dds_binaryproperty_t *binprop = &token->binary_properties.props[i];

        // Need to copy the correct values for challenge2 from the relation for the handshake to succeed

        if ((strcmp(binprop->name, "challenge1") == 0) && c1) {

            ddsrt_free(binprop->value.value);

            binprop->value.length = DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE;

            binprop->value.value = ddsrt_malloc(DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE);

            memcpy(binprop->value.value, c1->value._buffer, DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE);

        }

        if ((strcmp(binprop->name, "challenge2") == 0) && c2) {

            ddsrt_free(binprop->value.value);

            binprop->value.length = DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE;

            binprop->value.value = ddsrt_malloc(DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE);

            memcpy(binprop->value.value, c2->value._buffer, DDS_SECURITY_AUTHENTICATION_CHALLENGE_SIZE);

        }

        // Need to provide a valid signature for the handshake to succeed

        if (strcmp(binprop->name, "signature") == 0 && hash_c1 && c1 && c2 && dh1 && c2 && dh2 && hash_c2) {

            unsigned char *signature;

            size_t signatureLen;

            const DDS_Security_BinaryProperty_t *bprops[] = { hash_c1, c1, dh1, c2, dh2, hash_c2 };

            create_signature(bprops, 6, &signature, &signatureLen);

            ddsrt_free(binprop->value.value);

            binprop->value.length = (uint32_t) signatureLen;

            binprop->value.value = signature;

        }

    }

    ddsi_handshake_handle_message(harness.hs, harness.pp, harness.proxy_pp, &msg);

}

void fuzz_handshake_handle_crypto_tokens(void) {

    ddsi_thread_state_awake(ddsi_lookup_thread_state(), &gv);

    ddsi_handshake_crypto_tokens_received(harness.hs);

    ddsi_thread_state_asleep(ddsi_lookup_thread_state());

}

void fuzz_handshake_wait_for_event(uint32_t event) {

    dds_security_fsm_dispatch(harness.hs->fsm, FUZZ_HANDSHAKE_EVENT_HANDLED, false);

    while(ddsrt_atomic_ld32(&g_fuzz_events) != event) {}

}

void fuzz_handshake_wait_for_completion(void) {

    dds_security_fsm_dispatch(harness.hs->fsm, DDS_SECURITY_FSM_EVENT_DELETE, false);

    while(ddsrt_atomic_ld32(&g_fsm_done) == 0) {}

    ddsrt_wctime_t timestamp = { .v = dds_time() };

    ddsi_thread_state_awake(ddsi_lookup_thread_state(), &gv);

    ddsi_delete_proxy_participant_by_guid(&gv, &g_proxy_ppguid, timestamp, 1);

    ddsi_thread_state_asleep(ddsi_lookup_thread_state());

    harness.proxy_pp = NULL;

    harness.hs = NULL;

    // To actually delete all we created we need to step the what is normally

    // done by 4 different threads in the background (multi-stage cleanup via

    // the GC involves bubbles sent through the delivery queues; and then one

    // has to "send" the messages queued by the handshake code).

    bool x;

    do {

      x = false;

      if (ddsi_gcreq_queue_step (gv.gcreq_queue))

        x = true;

      if (ddsi_dqueue_step_deaf (gv.builtins_dqueue))

        x = true;

      if (ddsi_dqueue_step_deaf (gv.user_dqueue))

        x = true;

      ddsi_xeventq_step (gv.xevents);

    } while (x);

}