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-rw-r--r--source4/kdc/kdc.c145
1 files changed, 67 insertions, 78 deletions
diff --git a/source4/kdc/kdc.c b/source4/kdc/kdc.c
index 1f27154bde..8800891421 100644
--- a/source4/kdc/kdc.c
+++ b/source4/kdc/kdc.c
@@ -31,6 +31,7 @@
#include "system/network.h"
#include "dlinklist.h"
#include "lib/messaging/irpc.h"
+#include "lib/stream/packet.h"
/* hold all the info needed to send a reply */
struct kdc_reply {
@@ -66,14 +67,7 @@ struct kdc_tcp_connection {
/* the kdc_server the connection belongs to */
struct kdc_server *kdc;
- /* the partial data we've receiced yet */
- DATA_BLOB partial;
-
- /* the amount that we used yet from the partial buffer */
- uint32_t partial_read;
-
- /* prevent loops when we use half async code, while processing a requuest */
- BOOL processing;
+ struct packet_context *packet;
/* a queue of outgoing replies that have been deferred */
struct data_blob_list_item *send_queue;
@@ -208,96 +202,59 @@ static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, con
stream_terminate_connection(kdcconn->conn, reason);
}
+
/*
- receive some data on a KDC connection
+ work out if a tcp packet is complete
*/
-static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
+NTSTATUS kdc_tcp_is_complete(void *private, DATA_BLOB blob, size_t *size)
{
- struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private, struct kdc_tcp_connection);
+ if (blob.length < 4) {
+ return STATUS_MORE_ENTRIES;
+ }
+ *size = 4 + RIVAL(blob.data, 0);
+ if (*size > blob.length) {
+ return STATUS_MORE_ENTRIES;
+ }
+ if ((*size) & (1 << 31)) {
+ /* NOTE: we should send a 'KRB_ERR_FIELD_TOOLONG' and terminate,
+ but for now we just terminate */
+ return NT_STATUS_PORT_MESSAGE_TOO_LONG;
+ }
+ return NT_STATUS_OK;
+}
+
+
+/*
+ receive a full packet on a KDC connection
+*/
+static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
+{
+ struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
struct data_blob_list_item *rep;
- size_t nread;
const char *src_addr;
int src_port;
int ret;
DATA_BLOB input, reply;
- /* avoid recursion, because of half async code */
- if (kdcconn->processing) {
- EVENT_FD_NOT_READABLE(conn->event.fde);
- return;
- }
-
- if (kdcconn->partial.length == 0) {
- kdcconn->partial = data_blob_talloc(kdcconn, NULL, 4);
- if (!kdcconn->partial.data) goto nomem;
-
- kdcconn->partial_read = 0;
- }
-
- /* read in the packet length */
- if (kdcconn->partial_read < 4) {
- uint32_t packet_length;
-
- status = socket_recv(conn->socket,
- kdcconn->partial.data + kdcconn->partial_read,
- 4 - kdcconn->partial_read,
- &nread, 0);
- if (NT_STATUS_IS_ERR(status)) goto failed;
- if (!NT_STATUS_IS_OK(status)) return;
-
- kdcconn->partial_read += nread;
- if (kdcconn->partial_read != 4) return;
-
- packet_length = RIVAL(kdcconn->partial.data, 0) + 4;
-
- if (packet_length & (1 << 31)) {
- /* return 'KRB_ERR_FIELD_TOOLONG' and terminate */
- }
-
- kdcconn->partial.data = talloc_realloc(kdcconn, kdcconn->partial.data,
- uint8_t, packet_length);
- if (!kdcconn->partial.data) goto nomem;
-
- kdcconn->partial.length = packet_length;
- }
-
- /* read in the body */
- status = socket_recv(conn->socket,
- kdcconn->partial.data + kdcconn->partial_read,
- kdcconn->partial.length - kdcconn->partial_read,
- &nread, 0);
- if (NT_STATUS_IS_ERR(status)) goto failed;
- if (!NT_STATUS_IS_OK(status)) return;
-
- kdcconn->partial_read += nread;
- if (kdcconn->partial_read != kdcconn->partial.length) return;
-
- /*
- * we have parsed the request, so we can reset the kdcconn->partial_read,
- * maybe we could also free kdcconn->partial, but for now we keep it,
- * and overwrite it the next time
- */
- kdcconn->partial_read = 0;
+ talloc_steal(tmp_ctx, blob.data);
src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
if (!src_addr) goto nomem;
src_port = socket_get_peer_port(kdcconn->conn->socket);
DEBUG(2,("Received krb5 TCP packet of length %u from %s:%u\n",
- kdcconn->partial.length - 4, src_addr, src_port));
+ blob.length - 4, src_addr, src_port));
/* Call krb5 */
- kdcconn->processing = True;
- input = data_blob_const(kdcconn->partial.data + 4, kdcconn->partial.length - 4);
+ input = data_blob_const(blob.data + 4, blob.length - 4);
ret = kdcconn->process(kdcconn->kdc,
tmp_ctx,
&input,
&reply,
src_addr, src_port);
- kdcconn->processing = False;
if (!ret) {
status = NT_STATUS_INTERNAL_ERROR;
goto failed;
@@ -322,15 +279,34 @@ static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
}
DLIST_ADD_END(kdcconn->send_queue, rep, struct data_blob_list_item *);
- EVENT_FD_READABLE(kdcconn->conn->event.fde);
-
/* the call isn't needed any more */
talloc_free(tmp_ctx);
- return;
+ return NT_STATUS_OK;
nomem:
status = NT_STATUS_NO_MEMORY;
+
failed:
kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
+ return NT_STATUS_OK;
+}
+
+/*
+ receive some data on a KDC connection
+*/
+static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
+{
+ struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
+ struct kdc_tcp_connection);
+ packet_recv(kdcconn->packet);
+}
+
+/*
+ called on a tcp recv error
+*/
+static void kdc_tcp_recv_error(void *private, NTSTATUS status)
+{
+ struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
+ kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
}
/*
@@ -424,12 +400,25 @@ static void kdc_tcp_accept(struct stream_connection *conn)
kdcconn->kdc = kdc;
kdcconn->process = kdc_process;
conn->private = kdcconn;
+
+ kdcconn->packet = packet_init(kdcconn);
+ if (kdcconn->packet == NULL) {
+ stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
+ return;
+ }
+ packet_set_private(kdcconn->packet, kdcconn);
+ packet_set_socket(kdcconn->packet, conn->socket);
+ packet_set_callback(kdcconn->packet, kdc_tcp_recv);
+ packet_set_full_request(kdcconn->packet, kdc_tcp_is_complete);
+ packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
+ packet_set_event_context(kdcconn->packet, conn->event.ctx);
+ packet_set_serialise(kdcconn->packet, conn->event.fde);
}
static const struct stream_server_ops kdc_tcp_stream_ops = {
.name = "kdc_tcp",
.accept_connection = kdc_tcp_accept,
- .recv_handler = kdc_tcp_recv,
+ .recv_handler = kdc_tcp_recv_handler,
.send_handler = kdc_tcp_send
};
@@ -455,7 +444,7 @@ void kpasswdd_tcp_accept(struct stream_connection *conn)
static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
.name = "kpasswdd_tcp",
.accept_connection = kpasswdd_tcp_accept,
- .recv_handler = kdc_tcp_recv,
+ .recv_handler = kdc_tcp_recv_handler,
.send_handler = kdc_tcp_send
};
generated by cgit (git 2.34.1) at 2024-11-04 20:21:40 +0000