packet->data, packet->len, TRUE);
}
+/* Public key verification callback. Called by the application. */
+
+typedef struct {
+ SilcSKE ske;
+ SilcSKEVerifyCbCompletion completion;
+ void *completion_context;
+} *VerifyKeyContext;
+
+static void silc_client_verify_key_cb(bool success, void *context)
+{
+ VerifyKeyContext verify = (VerifyKeyContext)context;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ /* Call the completion callback back to the SKE */
+ verify->completion(verify->ske, success ? SILC_SKE_STATUS_OK :
+ SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
+ verify->completion_context);
+
+ silc_free(verify);
+}
+
/* Callback that is called when we have received KE2 payload from
responder. We try to verify the public key now. */
-SilcSKEStatus silc_client_protocol_ke_verify_key(SilcSKE ske,
- unsigned char *pk_data,
- uint32 pk_len,
- SilcSKEPKType pk_type,
- void *context)
+void silc_client_protocol_ke_verify_key(SilcSKE ske,
+ unsigned char *pk_data,
+ uint32 pk_len,
+ SilcSKEPKType pk_type,
+ void *context,
+ SilcSKEVerifyCbCompletion completion,
+ void *completion_context)
{
SilcProtocol protocol = (SilcProtocol)context;
SilcClientKEInternalContext *ctx =
(SilcClientKEInternalContext *)protocol->context;
SilcClient client = (SilcClient)ctx->client;
+ VerifyKeyContext verify;
SILC_LOG_DEBUG(("Start"));
- /* Verify public key from user. */
- if (!client->ops->verify_public_key(client, ctx->sock->user_data,
- ctx->sock->type,
- pk_data, pk_len, pk_type))
- return SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY;
+ verify = silc_calloc(1, sizeof(*verify));
+ verify->ske = ske;
+ verify->completion = completion;
+ verify->completion_context = completion_context;
- return SILC_SKE_STATUS_OK;
+ /* Verify public key from user. */
+ client->ops->verify_public_key(client, ctx->sock->user_data,
+ ctx->sock->type,
+ pk_data, pk_len, pk_type,
+ silc_client_verify_key_cb, verify);
}
/* Sets the negotiated key material into use for particular connection. */
return status;
}
+/* Callback that is called by the SKE to indicate that it is safe to
+ continue the execution of the protocol. Is given as argument to the
+ silc_ske_initiator_finish or silc_ske_responder_phase_2 functions.
+ This is called due to the fact that the public key verification
+ process is asynchronous and we must not continue the protocl until
+ the public key has been verified and this callback is called. */
+
+static void silc_client_protocol_ke_continue(SilcSKE ske,
+ void *context)
+{
+ SilcProtocol protocol = (SilcProtocol)context;
+ SilcClientKEInternalContext *ctx =
+ (SilcClientKEInternalContext *)protocol->context;
+ SilcClient client = (SilcClient)ctx->client;
+ SilcClientConnection conn = ctx->sock->user_data;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ if (ske->status != SILC_SKE_STATUS_OK) {
+ if (ske->status == SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY) {
+ client->ops->say(client, conn,
+ "Received unsupported server %s public key",
+ ctx->sock->hostname);
+ } else if (ske->status == SILC_SKE_STATUS_PUBLIC_KEY_NOT_PROVIDED) {
+ client->ops->say(client, conn,
+ "Remote host did not send its public key, even though "
+ "it must send it");
+ } else {
+ client->ops->say(client, conn,
+ "Error during key exchange protocol with server %s",
+ ctx->sock->hostname);
+ }
+
+ protocol->state = SILC_PROTOCOL_STATE_ERROR;
+ protocol->execute(client->timeout_queue, 0, protocol, 0, 0, 0);
+ return;
+ }
+
+ /* Send Ok to the other end. We will end the protocol as server
+ sends Ok to us when we will take the new keys into use. Do this
+ if we are initiator. This is happens when this callback was sent
+ to silc_ske_initiator_finish function. */
+ if (ctx->responder == FALSE) {
+ silc_ske_end(ctx->ske, ctx->send_packet, context);
+
+ /* End the protocol on the next round */
+ protocol->state = SILC_PROTOCOL_STATE_END;
+ }
+
+ /* Advance protocol state and call the next state if we are responder.
+ This happens when this callback was sent to silc_ske_responder_phase_2
+ function. */
+ if (ctx->responder == TRUE) {
+ protocol->state++;
+ protocol->execute(client->timeout_queue, 0, protocol, 0, 0, 100000);
+ }
+}
+
/* Performs key exchange protocol. This is used for both initiator
and responder key exchange. This may be called recursively. */
(SilcClientKEInternalContext *)protocol->context;
SilcClient client = (SilcClient)ctx->client;
SilcClientConnection conn = ctx->sock->user_data;
- SilcSKEStatus status = 0;
+ SilcSKEStatus status = SILC_SKE_STATUS_OK;
SILC_LOG_DEBUG(("Start"));
context);
}
+ /* Return now if the procedure is pending */
+ if (status == SILC_SKE_STATUS_PENDING)
+ return;
+
if (status != SILC_SKE_STATUS_OK) {
SILC_LOG_WARNING(("Error (type %d) during Key Exchange protocol",
status));
if (ctx->responder == TRUE) {
/* Process the received Key Exchange 1 Payload packet from
the initiator. This also creates our parts of the Diffie
- Hellman algorithm. */
+ Hellman algorithm. The silc_client_protocol_ke_continue will
+ be called after the public key has been verified. */
status = silc_ske_responder_phase_2(ctx->ske, ctx->packet->buffer,
- ctx->verify, context, NULL, NULL);
+ ctx->verify, context,
+ silc_client_protocol_ke_continue,
+ context);
} else {
/* Call the Phase-2 function. This creates Diffie Hellman
key exchange parameters and sends our public part inside
client->private_key,
ctx->send_packet,
context);
+ protocol->state++;
}
+ /* Return now if the procedure is pending */
+ if (status == SILC_SKE_STATUS_PENDING)
+ return;
+
if (status != SILC_SKE_STATUS_OK) {
SILC_LOG_WARNING(("Error (type %d) during Key Exchange protocol",
status));
protocol->execute(client->timeout_queue, 0, protocol, fd, 0, 0);
return;
}
-
- /* Advance protocol state and call the next state if we are responder */
- protocol->state++;
- if (ctx->responder == TRUE)
- protocol->execute(client->timeout_queue, 0, protocol, fd, 0, 100000);
}
break;
case 4:
SILC_SKE_PK_TYPE_SILC,
ctx->send_packet,
context);
- status = 0;
+
+ /* End the protocol on the next round */
+ protocol->state = SILC_PROTOCOL_STATE_END;
} else {
/* Finish the protocol. This verifies the Key Exchange 2 payload
- sent by responder. */
+ sent by responder. The silc_client_protocol_ke_continue will
+ be called after the public key has been verified. */
status = silc_ske_initiator_finish(ctx->ske, ctx->packet->buffer,
- ctx->verify, context, NULL, NULL);
+ ctx->verify, context,
+ silc_client_protocol_ke_continue,
+ context);
}
- if (status != SILC_SKE_STATUS_OK) {
+ /* Return now if the procedure is pending */
+ if (status == SILC_SKE_STATUS_PENDING)
+ return;
+ if (status != SILC_SKE_STATUS_OK) {
if (status == SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY) {
client->ops->say(client, conn,
"Received unsupported server %s public key",
protocol->execute(client->timeout_queue, 0, protocol, fd, 0, 0);
return;
}
-
- /* Send Ok to the other end. We will end the protocol as server
- sends Ok to us when we will take the new keys into use. */
- if (ctx->responder == FALSE)
- silc_ske_end(ctx->ske, ctx->send_packet, context);
-
- /* End the protocol on the next round */
- protocol->state = SILC_PROTOCOL_STATE_END;
}
break;
return FALSE;
}
+/* Continues the connection authentication protocol. This funtion may
+ be called directly or used as SilcAskPassphrase callback. */
+
+static void
+silc_client_conn_auth_continue(unsigned char *auth_data,
+ uint32 auth_data_len, void *context)
+{
+ SilcProtocol protocol = (SilcProtocol)context;
+ SilcClientConnAuthInternalContext *ctx =
+ (SilcClientConnAuthInternalContext *)protocol->context;
+ SilcClient client = (SilcClient)ctx->client;
+ SilcBuffer packet;
+ int payload_len = 0;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ payload_len = 4 + auth_data_len;
+ packet = silc_buffer_alloc(payload_len);
+ silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
+ silc_buffer_format(packet,
+ SILC_STR_UI_SHORT(payload_len),
+ SILC_STR_UI_SHORT(SILC_SOCKET_TYPE_CLIENT),
+ SILC_STR_UI_XNSTRING(auth_data, auth_data_len),
+ SILC_STR_END);
+
+ /* Send the packet to server */
+ silc_client_packet_send(client, ctx->sock,
+ SILC_PACKET_CONNECTION_AUTH,
+ NULL, 0, NULL, NULL,
+ packet->data, packet->len, TRUE);
+
+ if (auth_data) {
+ memset(auth_data, 0, auth_data_len);
+ silc_free(auth_data);
+ }
+ silc_buffer_free(packet);
+
+ /* Next state is end of protocol */
+ protocol->state = SILC_PROTOCOL_STATE_END;
+}
+
SILC_TASK_CALLBACK(silc_client_protocol_connection_auth)
{
SilcProtocol protocol = (SilcProtocol)context;
* Start protocol. We send authentication data to the server
* to be authenticated.
*/
- SilcBuffer packet;
- int payload_len = 0;
unsigned char *auth_data = NULL;
uint32 auth_data_len = 0;
client->ops->say(client, conn,
"Password authentication required by server %s",
ctx->sock->hostname);
- auth_data = client->ops->ask_passphrase(client, conn);
- auth_data_len = strlen(auth_data);
+ client->ops->ask_passphrase(client, conn,
+ silc_client_conn_auth_continue,
+ protocol);
+ return;
break;
case SILC_AUTH_PUBLIC_KEY:
}
}
- payload_len = 4 + auth_data_len;
- packet = silc_buffer_alloc(payload_len);
- silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
- silc_buffer_format(packet,
- SILC_STR_UI_SHORT(payload_len),
- SILC_STR_UI_SHORT(SILC_SOCKET_TYPE_CLIENT),
- SILC_STR_UI_XNSTRING(auth_data, auth_data_len),
- SILC_STR_END);
-
- /* Send the packet to server */
- silc_client_packet_send(client, ctx->sock,
- SILC_PACKET_CONNECTION_AUTH,
- NULL, 0, NULL, NULL,
- packet->data, packet->len, TRUE);
-
- if (auth_data) {
- memset(auth_data, 0, auth_data_len);
- silc_free(auth_data);
- }
- silc_buffer_free(packet);
-
- /* Next state is end of protocol */
- protocol->state = SILC_PROTOCOL_STATE_END;
+ silc_client_conn_auth_continue(auth_data,
+ auth_data_len, protocol);
}
break;
projects / silc.git / blobdiff