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server: Define rsa-aes server key length constant

rsa-aes
Andri Yngvason 2023-09-05 08:41:25 +00:00
parent 103fbe996e
commit 7eb9882877
1 changed files with 35 additions and 34 deletions
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69
src/server.c
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@ -68,6 +68,7 @@
#define DEFAULT_NAME "Neat VNC" #define DEFAULT_NAME "Neat VNC"
#define SECURITY_TYPES_MAX 3 #define SECURITY_TYPES_MAX 3
#define RSA_AES_SERVER_KEY_LENGTH 256
#define UDIV_UP(a, b) (((a) + (b) - 1) / (b)) #define UDIV_UP(a, b) (((a) + (b) - 1) / (b))
@ -402,11 +403,11 @@ static int apple_dh_send_public_key(struct nvnc_client* client)
crypto_derive_public_key(client->apple_dh_secret); crypto_derive_public_key(client->apple_dh_secret);
assert(pub); assert(pub);
uint8_t mod[256] = {}; uint8_t mod[RSA_AES_SERVER_KEY_LENGTH] = {};
int mod_len = crypto_key_p(pub, mod, sizeof(mod)); int mod_len = crypto_key_p(pub, mod, sizeof(mod));
assert(mod_len == sizeof(mod)); assert(mod_len == sizeof(mod));
uint8_t q[256] = {}; uint8_t q[RSA_AES_SERVER_KEY_LENGTH] = {};
int q_len = crypto_key_q(pub, q, sizeof(q)); int q_len = crypto_key_q(pub, q, sizeof(q));
assert(q_len == sizeof(q)); assert(q_len == sizeof(q));
@ -430,7 +431,7 @@ static int on_apple_dh_response(struct nvnc_client* client)
struct rfb_apple_dh_client_msg* msg = struct rfb_apple_dh_client_msg* msg =
(void*)(client->msg_buffer + client->buffer_index); (void*)(client->msg_buffer + client->buffer_index);
uint8_t p[256]; uint8_t p[RSA_AES_SERVER_KEY_LENGTH];
int key_len = crypto_key_p(client->apple_dh_secret, p, sizeof(p)); int key_len = crypto_key_p(client->apple_dh_secret, p, sizeof(p));
assert(key_len == sizeof(p)); assert(key_len == sizeof(p));
@ -447,7 +448,7 @@ static int on_apple_dh_response(struct nvnc_client* client)
crypto_derive_shared_secret(client->apple_dh_secret, remote_key); crypto_derive_shared_secret(client->apple_dh_secret, remote_key);
assert(shared_secret); assert(shared_secret);
uint8_t shared_buf[256]; uint8_t shared_buf[RSA_AES_SERVER_KEY_LENGTH];
crypto_key_q(shared_secret, shared_buf, sizeof(shared_buf)); crypto_key_q(shared_secret, shared_buf, sizeof(shared_buf));
crypto_key_del(shared_secret); crypto_key_del(shared_secret);
@ -497,19 +498,20 @@ static int rsa_aes_send_public_key(struct nvnc_client* client)
} }
assert(server->rsa_pub && server->rsa_priv); assert(server->rsa_pub && server->rsa_priv);
char buffer[sizeof(struct rfb_rsa_aes_pub_key_msg) + 512] = {}; char buffer[sizeof(struct rfb_rsa_aes_pub_key_msg) +
RSA_AES_SERVER_KEY_LENGTH * 2] = {};
struct rfb_rsa_aes_pub_key_msg* msg = struct rfb_rsa_aes_pub_key_msg* msg =
(struct rfb_rsa_aes_pub_key_msg*)buffer; (struct rfb_rsa_aes_pub_key_msg*)buffer;
uint8_t* modulus = msg->modulus_and_exponent; uint8_t* modulus = msg->modulus_and_exponent;
uint8_t* exponent = msg->modulus_and_exponent + 256; uint8_t* exponent = msg->modulus_and_exponent +
RSA_AES_SERVER_KEY_LENGTH;
msg->length = htonl(2048); msg->length = htonl(RSA_AES_SERVER_KEY_LENGTH * 8);
crypto_rsa_pub_key_modulus(server->rsa_pub, modulus, 256); crypto_rsa_pub_key_modulus(server->rsa_pub, modulus,
crypto_rsa_pub_key_exponent(server->rsa_pub, exponent, 256); RSA_AES_SERVER_KEY_LENGTH);
crypto_rsa_pub_key_exponent(server->rsa_pub, exponent,
crypto_dump_base16("Sending public key modulus", modulus, 256); RSA_AES_SERVER_KEY_LENGTH);
crypto_dump_base16("Sending public key exponent", exponent, 256);
stream_write(client->net_stream, buffer, sizeof(buffer), NULL, NULL); stream_write(client->net_stream, buffer, sizeof(buffer), NULL, NULL);
return 0; return 0;
@ -524,8 +526,9 @@ static int rsa_aes_send_challenge(struct nvnc_client* client,
struct rfb_rsa_aes_challenge_msg *msg = struct rfb_rsa_aes_challenge_msg *msg =
(struct rfb_rsa_aes_challenge_msg*)buffer; (struct rfb_rsa_aes_challenge_msg*)buffer;
ssize_t len = crypto_rsa_encrypt(pub, msg->challenge, 256, ssize_t len = crypto_rsa_encrypt(pub, msg->challenge,
client->rsa.challenge, sizeof(client->rsa.challenge)); RSA_AES_SERVER_KEY_LENGTH, client->rsa.challenge,
sizeof(client->rsa.challenge));
msg->length = htons(len); msg->length = htons(len);
nvnc_trace("Challenge length is %zd", len); nvnc_trace("Challenge length is %zd", len);
@ -561,10 +564,6 @@ static int on_rsa_aes_public_key(struct nvnc_client* client)
crypto_rsa_pub_key_import(modulus, exponent, byte_length); crypto_rsa_pub_key_import(modulus, exponent, byte_length);
assert(client->rsa.pub); assert(client->rsa.pub);
uint8_t foo[256];
crypto_rsa_pub_key_exponent(client->rsa.pub, foo, 256);
crypto_dump_base16("Got public key exponent check", foo, 256);
client->state = VNC_CLIENT_STATE_WAITING_FOR_RSA_AES_CHALLENGE; client->state = VNC_CLIENT_STATE_WAITING_FOR_RSA_AES_CHALLENGE;
rsa_aes_send_challenge(client, client->rsa.pub); rsa_aes_send_challenge(client, client->rsa.pub);
@ -630,10 +629,12 @@ static int on_rsa_aes_challenge(struct nvnc_client* client)
stream_upgrade_to_rsa_eas(client->net_stream, server_session_key, stream_upgrade_to_rsa_eas(client->net_stream, server_session_key,
client_session_key); client_session_key);
uint8_t server_modulus[256]; uint8_t server_modulus[RSA_AES_SERVER_KEY_LENGTH];
uint8_t server_exponent[256]; uint8_t server_exponent[RSA_AES_SERVER_KEY_LENGTH];
crypto_rsa_pub_key_modulus(server->rsa_pub, server_modulus, 256); crypto_rsa_pub_key_modulus(server->rsa_pub, server_modulus,
crypto_rsa_pub_key_exponent(server->rsa_pub, server_exponent, 256); RSA_AES_SERVER_KEY_LENGTH);
crypto_rsa_pub_key_exponent(server->rsa_pub, server_exponent,
RSA_AES_SERVER_KEY_LENGTH);
size_t client_key_len = crypto_rsa_pub_key_length(client->rsa.pub); size_t client_key_len = crypto_rsa_pub_key_length(client->rsa.pub);
uint8_t* client_modulus = malloc(client_key_len * 2); uint8_t* client_modulus = malloc(client_key_len * 2);
@ -644,15 +645,15 @@ static int on_rsa_aes_challenge(struct nvnc_client* client)
crypto_rsa_pub_key_exponent(client->rsa.pub, client_exponent, crypto_rsa_pub_key_exponent(client->rsa.pub, client_exponent,
client_key_len); client_key_len);
uint32_t server_key_len_be = htonl(256 * 8); uint32_t server_key_len_be = htonl(RSA_AES_SERVER_KEY_LENGTH * 8);
uint32_t client_key_len_be = htonl(client_key_len * 8); uint32_t client_key_len_be = htonl(client_key_len * 8);
uint8_t server_hash[20] = {}; uint8_t server_hash[20] = {};
crypto_hash_many(server_hash, sizeof(server_hash), crypto_hash_many(server_hash, sizeof(server_hash),
CRYPTO_HASH_SHA1, (const struct crypto_data_entry[]) { CRYPTO_HASH_SHA1, (const struct crypto_data_entry[]) {
{ (uint8_t*)&server_key_len_be, 4 }, { (uint8_t*)&server_key_len_be, 4 },
{ server_modulus, 256 }, { server_modulus, RSA_AES_SERVER_KEY_LENGTH },
{ server_exponent, 256 }, { server_exponent, RSA_AES_SERVER_KEY_LENGTH },
{ (uint8_t*)&client_key_len_be, 4 }, { (uint8_t*)&client_key_len_be, 4 },
{ client_modulus, client_key_len }, { client_modulus, client_key_len },
{ client_exponent, client_key_len }, { client_exponent, client_key_len },
@ -661,8 +662,6 @@ static int on_rsa_aes_challenge(struct nvnc_client* client)
free(client_modulus); free(client_modulus);
crypto_dump_base16("Server hash", server_hash, 20);
stream_write(client->net_stream, server_hash, 20, NULL, NULL); stream_write(client->net_stream, server_hash, 20, NULL, NULL);
client->state = VNC_CLIENT_STATE_WAITING_FOR_RSA_AES_CLIENT_HASH; client->state = VNC_CLIENT_STATE_WAITING_FOR_RSA_AES_CLIENT_HASH;
@ -679,10 +678,12 @@ static int on_rsa_aes_client_hash(struct nvnc_client* client)
struct nvnc* server = client->server; struct nvnc* server = client->server;
uint8_t server_modulus[256]; uint8_t server_modulus[RSA_AES_SERVER_KEY_LENGTH];
uint8_t server_exponent[256]; uint8_t server_exponent[RSA_AES_SERVER_KEY_LENGTH];
crypto_rsa_pub_key_modulus(server->rsa_pub, server_modulus, 256); crypto_rsa_pub_key_modulus(server->rsa_pub, server_modulus,
crypto_rsa_pub_key_exponent(server->rsa_pub, server_exponent, 256); RSA_AES_SERVER_KEY_LENGTH);
crypto_rsa_pub_key_exponent(server->rsa_pub, server_exponent,
RSA_AES_SERVER_KEY_LENGTH);
size_t client_key_len = crypto_rsa_pub_key_length(client->rsa.pub); size_t client_key_len = crypto_rsa_pub_key_length(client->rsa.pub);
uint8_t* client_modulus = malloc(client_key_len * 2); uint8_t* client_modulus = malloc(client_key_len * 2);
@ -693,7 +694,7 @@ static int on_rsa_aes_client_hash(struct nvnc_client* client)
crypto_rsa_pub_key_exponent(client->rsa.pub, client_exponent, crypto_rsa_pub_key_exponent(client->rsa.pub, client_exponent,
client_key_len); client_key_len);
uint32_t server_key_len_be = htonl(256 * 8); uint32_t server_key_len_be = htonl(RSA_AES_SERVER_KEY_LENGTH * 8);
uint32_t client_key_len_be = htonl(client_key_len * 8); uint32_t client_key_len_be = htonl(client_key_len * 8);
uint8_t client_hash[20] = {}; uint8_t client_hash[20] = {};
@ -703,8 +704,8 @@ static int on_rsa_aes_client_hash(struct nvnc_client* client)
{ client_modulus, client_key_len }, { client_modulus, client_key_len },
{ client_exponent, client_key_len }, { client_exponent, client_key_len },
{ (uint8_t*)&server_key_len_be, 4 }, { (uint8_t*)&server_key_len_be, 4 },
{ server_modulus, 256 }, { server_modulus, RSA_AES_SERVER_KEY_LENGTH },
{ server_exponent, 256 }, { server_exponent, RSA_AES_SERVER_KEY_LENGTH },
{} {}
}); });