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tls: process CHANGE_CIPHER_SPEC and FINISHED from server

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Successfully finishes handshake with test servers using NULL-SHA256
cipher.

The "only" thing remaining before there is a chance
this can actually work with real servers is AES encrypt/decrypt.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-01-17 17:24:11 +01:00
parent fe0588df3b
commit e69d78c038
1 changed files with 32 additions and 28 deletions
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60
networking/tls.c
View File

@ -163,6 +163,7 @@ typedef struct tls_state {
uint8_t master_secret[48];
uint8_t encrypt_on_write;
uint8_t decrypt_on_read;
uint8_t client_write_MAC_key[SHA256_OUTSIZE];
// RFC 5246
// sequence number
@ -1044,15 +1045,16 @@ static void send_client_key_exchange(tls_state_t *tls)
}
}
static const uint8_t rec_CHANGE_CIPHER_SPEC[] = {
RECORD_TYPE_CHANGE_CIPHER_SPEC, TLS_MAJ, TLS_MIN, 00, 01,
01
};
static void send_change_cipher_spec(tls_state_t *tls)
{
static const uint8_t rec[] = {
RECORD_TYPE_CHANGE_CIPHER_SPEC, TLS_MAJ, TLS_MIN, 00, 01,
01
};
/* Not "xwrite_and_hash": this is not a handshake message */
dbg(">> CHANGE_CIPHER_SPEC\n");
xwrite(tls->fd, rec, sizeof(rec));
xwrite(tls->fd, rec_CHANGE_CIPHER_SPEC, sizeof(rec_CHANGE_CIPHER_SPEC));
/* tls->write_seq64_be = 0; - already is */
tls->encrypt_on_write = 1;
@ -1138,16 +1140,6 @@ static void send_client_finished(tls_state_t *tls)
xwrite_and_hash(tls, &record, sizeof(record));
}
static void get_change_cipher_spec(tls_state_t *tls)
{
tls->fd = 0;
}
static void get_server_finished(tls_state_t *tls)
{
tls->fd = 0;
}
static void tls_handshake(tls_state_t *tls)
{
// Client RFC 5246 Server
@ -1205,20 +1197,32 @@ static void tls_handshake(tls_state_t *tls)
// (i.e. the same format as server certs)
// xread_tls_handshake_block(tls, 4);
// }
if (tls->inbuf[5] == HANDSHAKE_SERVER_HELLO_DONE) {
// 0e 000000 (len:0)
dbg("got SERVER_HELLO_DONE\n");
send_client_key_exchange(tls);
send_change_cipher_spec(tls);
//we now should be able to send encrypted... as soon as we grok AES.
send_client_finished(tls);
get_change_cipher_spec(tls);
get_server_finished(tls);
//we now should receive encrypted, and application data can be sent/received
} else {
if (tls->inbuf[5] != HANDSHAKE_SERVER_HELLO_DONE)
tls_error_die(tls);
}
// 0e 000000 (len:0)
dbg("got SERVER_HELLO_DONE\n");
send_client_key_exchange(tls);
send_change_cipher_spec(tls);
/* we now should send encrypted... as soon as we grok AES. */
send_client_finished(tls);
/* Get CHANGE_CIPHER_SPEC */
len = xread_tls_block(tls);
if (len != 1 || memcmp(tls->inbuf, rec_CHANGE_CIPHER_SPEC, 6) != 0)
tls_error_die(tls);
dbg("got CHANGE_CIPHER_SPEC\n");
tls->decrypt_on_read = 1;
/* we now should receive encrypted */
/* Get (encrypted) FINISHED from the server */
len = xread_tls_block(tls);
if (len < 4 || tls->inbuf[5] != HANDSHAKE_FINISHED)
tls_error_die(tls);
dbg("got FINISHED\n");
/* application data can be sent/received */
}
// To run a test server using openssl: