/**
* @return 1 success, 0 auth/ID error, -1 other error
*/
int TLSConnect(ConnectionInfo *conn_info, bool trust_server,
const char *ipaddr, const char *username)
{
int ret;
ret = TLSTry(conn_info);
if (ret == -1)
{
return -1;
}
/* TODO username is local, fix. */
ret = TLSVerifyPeer(conn_info, ipaddr, username);
if (ret == -1) /* error */
{
return -1;
}
const char *key_hash = KeyPrintableHash(conn_info->remote_key);
if (ret == 1)
{
Log(LOG_LEVEL_VERBOSE,
"Server is TRUSTED, received key '%s' MATCHES stored one.",
key_hash);
}
else /* ret == 0 */
{
if (trust_server) /* We're most probably bootstrapping. */
{
Log(LOG_LEVEL_NOTICE, "Trusting new key: %s", key_hash);
SavePublicKey(username, KeyPrintableHash(conn_info->remote_key),
KeyRSA(conn_info->remote_key));
}
else
{
Log(LOG_LEVEL_ERR,
"TRUST FAILED, server presented untrusted key: %s", key_hash);
return -1;
}
}
/* TLS CONNECTION IS ESTABLISHED, negotiate protocol version and send
* identification data. */
ret = TLSClientIdentificationDialog(conn_info, username);
return ret;
}
/*
* Tests
*/
static void test_key_basic(void)
{
test_setup();
ASSERT_IF_NOT_INITIALIZED;
Key *key = NULL;
assert_true(key == NULL);
key = KeyNew(rsa, HASH_METHOD_MD5);
assert_true(key != NULL);
assert_int_equal(HASH_METHOD_MD5, KeyHashMethod(key));
assert_true(rsa == KeyRSA(key));
unsigned int length = 0;
assert_true(KeyBinaryHash(key, &length) != NULL);
assert_int_equal(CF_MD5_LEN, length);
assert_true(KeyPrintableHash(key) != NULL);
/* Negative cases */
assert_true(NULL == KeyNew(NULL, HASH_METHOD_MD5));
assert_true(NULL == KeyNew(rsa, HASH_METHOD_NONE));
assert_true(NULL == KeyNew(NULL, HASH_METHOD_NONE));
/* Finish */
KeyDestroy(&key);
assert_true(key == NULL);
test_teardown();
}
/**
* @brief Accept a TLS connection and authenticate and identify.
* @note Various fields in #conn are set, like username and keyhash.
*/
int ServerTLSSessionEstablish(ServerConnectionState *conn)
{
int ret;
if (ConnectionInfoConnectionStatus(conn->conn_info) != CF_CONNECTION_ESTABLISHED)
{
assert(ConnectionInfoSSL(conn->conn_info) == NULL);
SSL *ssl = SSL_new(SSLSERVERCONTEXT);
if (ssl == NULL)
{
Log(LOG_LEVEL_ERR, "SSL_new: %s",
TLSErrorString(ERR_get_error()));
return -1;
}
ConnectionInfoSetSSL(conn->conn_info, ssl);
/* Pass conn_info inside the ssl struct for TLSVerifyCallback(). */
SSL_set_ex_data(ssl, CONNECTIONINFO_SSL_IDX, conn->conn_info);
/* Now we are letting OpenSSL take over the open socket. */
SSL_set_fd(ssl, ConnectionInfoSocket(conn->conn_info));
ret = SSL_accept(ssl);
if (ret <= 0)
{
TLSLogError(ssl, LOG_LEVEL_ERR,
"Failed to accept TLS connection", ret);
return -1;
}
Log(LOG_LEVEL_VERBOSE, "TLS cipher negotiated: %s, %s",
SSL_get_cipher_name(ssl),
SSL_get_cipher_version(ssl));
Log(LOG_LEVEL_VERBOSE, "TLS session established, checking trust...");
/* Send/Receive "CFE_v%d" version string, agree on version, receive
identity (username) of peer. */
char username[sizeof(conn->username)] = "";
bool b = ServerIdentificationDialog(conn->conn_info,
username, sizeof(username));
if (b != true)
{
return -1;
}
/* We *now* (maybe a bit late) verify the key that the client sent us in
* the TLS handshake, since we need the username to do so. TODO in the
* future store keys irrelevant of username, so that we can match them
* before IDENTIFY. */
ret = TLSVerifyPeer(conn->conn_info, conn->ipaddr, username);
if (ret == -1) /* error */
{
return -1;
}
if (ret == 1) /* trusted key */
{
Log(LOG_LEVEL_VERBOSE,
"%s: Client is TRUSTED, public key MATCHES stored one.",
KeyPrintableHash(ConnectionInfoKey(conn->conn_info)));
}
if (ret == 0) /* untrusted key */
{
if ((SV.trustkeylist != NULL) &&
(IsMatchItemIn(SV.trustkeylist, conn->ipaddr)))
{
Log(LOG_LEVEL_VERBOSE,
"Peer was found in \"trustkeysfrom\" list");
Log(LOG_LEVEL_NOTICE, "Trusting new key: %s",
KeyPrintableHash(ConnectionInfoKey(conn->conn_info)));
SavePublicKey(username, KeyPrintableHash(conn->conn_info->remote_key),
KeyRSA(ConnectionInfoKey(conn->conn_info)));
}
else
{
Log(LOG_LEVEL_NOTICE,
"TRUST FAILED, peer presented an untrusted key, dropping connection!");
Log(LOG_LEVEL_VERBOSE,
"Add peer to \"trustkeysfrom\" if you really want to start trusting this new key.");
return -1;
}
}
/* All checks succeeded, set conn->uid (conn->sid for Windows)
* according to the received USERNAME identity. */
SetConnIdentity(conn, username);
/* No CAUTH, SAUTH in non-classic protocol. */
conn->user_data_set = 1;
conn->rsa_auth = 1;
LastSaw1(conn->ipaddr, KeyPrintableHash(ConnectionInfoKey(conn->conn_info)),
LAST_SEEN_ROLE_ACCEPT);
ServerSendWelcome(conn);
}
return 1;
}
