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s4-kdc: Move KDC packet handling functions to kdc-server.c

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Create an Kerberos implmentation independent KDC-SERVER subsystem so we
can use it to implement a kpasswd server with MIT Kerberos in future.

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sun Jun 19 03:31:32 CEST 2016 on sn-devel-144
This commit is contained in:
Andreas Schneider 2016-06-10 11:29:20 +02:00 committed by Jeremy Allison
parent 3da8932e4c
commit 3de3f643a8
4 changed files with 638 additions and 590 deletions
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587
source4/kdc/kdc-heimdal.c
View File

@ -24,11 +24,9 @@
#include "includes.h"
#include "smbd/process_model.h"
#include "lib/tsocket/tsocket.h"
#include "libcli/util/tstream.h"
#include "lib/messaging/irpc.h"
#include "librpc/gen_ndr/ndr_irpc.h"
#include "librpc/gen_ndr/ndr_krb5pac.h"
#include "lib/stream/packet.h"
#include "lib/socket/netif.h"
#include "param/param.h"
#include "kdc/kdc-server.h"
@ -45,78 +43,6 @@ NTSTATUS server_service_kdc_init(void);
extern struct krb5plugin_windc_ftable windc_plugin_table;
static NTSTATUS kdc_proxy_unavailable_error(struct kdc_server *kdc,
TALLOC_CTX *mem_ctx,
DATA_BLOB *out)
{
int kret;
krb5_data k5_error_blob;
kret = smb_krb5_mk_error(kdc->smb_krb5_context->krb5_context,
KRB5KDC_ERR_SVC_UNAVAILABLE,
NULL,
NULL,
&k5_error_blob);
if (kret != 0) {
DEBUG(2,(__location__ ": Unable to form krb5 error reply\n"));
return NT_STATUS_INTERNAL_ERROR;
}
*out = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
kerberos_free_data_contents(kdc->smb_krb5_context->krb5_context,
&k5_error_blob);
if (!out->data) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
struct kdc_tcp_call {
struct kdc_tcp_connection *kdc_conn;
DATA_BLOB in;
DATA_BLOB out;
uint8_t out_hdr[4];
struct iovec out_iov[2];
};
/*
state of an open tcp connection
*/
struct kdc_tcp_connection {
/* stream connection we belong to */
struct stream_connection *conn;
/* the kdc_server the connection belongs to */
struct kdc_socket *kdc_socket;
struct tstream_context *tstream;
struct tevent_queue *send_queue;
};
static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
{
stream_terminate_connection(kdcconn->conn, reason);
}
static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
struct kdc_tcp_connection);
/* this should never be triggered! */
kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
}
static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
struct kdc_tcp_connection);
/* this should never be triggered! */
kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
}
/**
Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
calling conventions
@ -180,519 +106,6 @@ static kdc_code kdc_process(struct kdc_server *kdc,
return KDC_OK;
}
static void kdc_tcp_call_proxy_done(struct tevent_req *subreq);
static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
static void kdc_tcp_call_loop(struct tevent_req *subreq)
{
struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
struct kdc_tcp_connection);
struct kdc_tcp_call *call;
NTSTATUS status;
kdc_code ret;
call = talloc(kdc_conn, struct kdc_tcp_call);
if (call == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for kdc_tcp_call");
return;
}
call->kdc_conn = kdc_conn;
status = tstream_read_pdu_blob_recv(subreq,
call,
&call->in);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
const char *reason;
reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
"tstream_read_pdu_blob_recv() - %s",
nt_errstr(status));
if (!reason) {
reason = nt_errstr(status);
}
kdc_tcp_terminate_connection(kdc_conn, reason);
return;
}
DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
(long) call->in.length,
tsocket_address_string(kdc_conn->conn->remote_address, call)));
/* skip length header */
call->in.data +=4;
call->in.length -= 4;
/* Call krb5 */
ret = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
call,
&call->in,
&call->out,
kdc_conn->conn->remote_address,
kdc_conn->conn->local_address,
0 /* Stream */);
if (ret == KDC_ERROR) {
kdc_tcp_terminate_connection(kdc_conn,
"kdc_tcp_call_loop: process function failed");
return;
}
if (ret == KDC_PROXY_REQUEST) {
uint16_t port;
if (!kdc_conn->kdc_socket->kdc->am_rodc) {
kdc_tcp_terminate_connection(kdc_conn,
"kdc_tcp_call_loop: proxying requested when not RODC");
return;
}
port = tsocket_address_inet_port(kdc_conn->conn->local_address);
subreq = kdc_tcp_proxy_send(call,
kdc_conn->conn->event.ctx,
kdc_conn->kdc_socket->kdc,
port,
call->in);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn,
"kdc_tcp_call_loop: kdc_tcp_proxy_send failed");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_proxy_done, call);
return;
}
/* First add the length of the out buffer */
RSIVAL(call->out_hdr, 0, call->out.length);
call->out_iov[0].iov_base = (char *) call->out_hdr;
call->out_iov[0].iov_len = 4;
call->out_iov[1].iov_base = (char *) call->out.data;
call->out_iov[1].iov_len = call->out.length;
subreq = tstream_writev_queue_send(call,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
kdc_conn->send_queue,
call->out_iov, 2);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_writev_queue_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
/*
* The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(kdc_conn,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
kdc_conn);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
}
static void kdc_tcp_call_proxy_done(struct tevent_req *subreq)
{
struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
struct kdc_tcp_call);
struct kdc_tcp_connection *kdc_conn = call->kdc_conn;
NTSTATUS status;
status = kdc_tcp_proxy_recv(subreq, call, &call->out);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
/* generate an error packet */
status = kdc_proxy_unavailable_error(kdc_conn->kdc_socket->kdc,
call, &call->out);
}
if (!NT_STATUS_IS_OK(status)) {
const char *reason;
reason = talloc_asprintf(call, "kdc_tcp_call_proxy_done: "
"kdc_proxy_unavailable_error - %s",
nt_errstr(status));
if (!reason) {
reason = "kdc_tcp_call_proxy_done: kdc_proxy_unavailable_error() failed";
}
kdc_tcp_terminate_connection(call->kdc_conn, reason);
return;
}
/* First add the length of the out buffer */
RSIVAL(call->out_hdr, 0, call->out.length);
call->out_iov[0].iov_base = (char *) call->out_hdr;
call->out_iov[0].iov_len = 4;
call->out_iov[1].iov_base = (char *) call->out.data;
call->out_iov[1].iov_len = call->out.length;
subreq = tstream_writev_queue_send(call,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
kdc_conn->send_queue,
call->out_iov, 2);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_writev_queue_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
/*
* The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(kdc_conn,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
kdc_conn);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
}
static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
{
struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
struct kdc_tcp_call);
int sys_errno;
int rc;
rc = tstream_writev_queue_recv(subreq, &sys_errno);
TALLOC_FREE(subreq);
if (rc == -1) {
const char *reason;
reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
"tstream_writev_queue_recv() - %d:%s",
sys_errno, strerror(sys_errno));
if (!reason) {
reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
}
kdc_tcp_terminate_connection(call->kdc_conn, reason);
return;
}
/* We don't care about errors */
talloc_free(call);
}
/*
called when we get a new connection
*/
static void kdc_tcp_accept(struct stream_connection *conn)
{
struct kdc_socket *kdc_socket;
struct kdc_tcp_connection *kdc_conn;
struct tevent_req *subreq;
int rc;
kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
if (kdc_conn == NULL) {
stream_terminate_connection(conn,
"kdc_tcp_accept: out of memory");
return;
}
kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
if (kdc_conn->send_queue == NULL) {
stream_terminate_connection(conn,
"kdc_tcp_accept: out of memory");
return;
}
kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
TALLOC_FREE(conn->event.fde);
rc = tstream_bsd_existing_socket(kdc_conn,
socket_get_fd(conn->socket),
&kdc_conn->tstream);
if (rc < 0) {
stream_terminate_connection(conn,
"kdc_tcp_accept: out of memory");
return;
}
kdc_conn->conn = conn;
kdc_conn->kdc_socket = kdc_socket;
conn->private_data = kdc_conn;
/*
* The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(kdc_conn,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
kdc_conn);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
}
static const struct stream_server_ops kdc_tcp_stream_ops = {
.name = "kdc_tcp",
.accept_connection = kdc_tcp_accept,
.recv_handler = kdc_tcp_recv,
.send_handler = kdc_tcp_send
};
struct kdc_udp_call {
struct kdc_udp_socket *sock;
struct tsocket_address *src;
DATA_BLOB in;
DATA_BLOB out;
};
static void kdc_udp_call_proxy_done(struct tevent_req *subreq);
static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
static void kdc_udp_call_loop(struct tevent_req *subreq)
{
struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
struct kdc_udp_socket);
struct kdc_udp_call *call;
uint8_t *buf;
ssize_t len;
int sys_errno;
kdc_code ret;
call = talloc(sock, struct kdc_udp_call);
if (call == NULL) {
talloc_free(call);
goto done;
}
call->sock = sock;
len = tdgram_recvfrom_recv(subreq, &sys_errno,
call, &buf, &call->src);
TALLOC_FREE(subreq);
if (len == -1) {
talloc_free(call);
goto done;
}
call->in.data = buf;
call->in.length = len;
DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
(long)call->in.length,
tsocket_address_string(call->src, call)));
/* Call krb5 */
ret = sock->kdc_socket->process(sock->kdc_socket->kdc,
call,
&call->in,
&call->out,
call->src,
sock->kdc_socket->local_address,
1 /* Datagram */);
if (ret == KDC_ERROR) {
talloc_free(call);
goto done;
}
if (ret == KDC_PROXY_REQUEST) {
uint16_t port;
if (!sock->kdc_socket->kdc->am_rodc) {
DEBUG(0,("kdc_udp_call_loop: proxying requested when not RODC"));
talloc_free(call);
goto done;
}
port = tsocket_address_inet_port(sock->kdc_socket->local_address);
subreq = kdc_udp_proxy_send(call,
sock->kdc_socket->kdc->task->event_ctx,
sock->kdc_socket->kdc,
port,
call->in);
if (subreq == NULL) {
talloc_free(call);
goto done;
}
tevent_req_set_callback(subreq, kdc_udp_call_proxy_done, call);
goto done;
}
subreq = tdgram_sendto_queue_send(call,
sock->kdc_socket->kdc->task->event_ctx,
sock->dgram,
sock->send_queue,
call->out.data,
call->out.length,
call->src);
if (subreq == NULL) {
talloc_free(call);
goto done;
}
tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
done:
subreq = tdgram_recvfrom_send(sock,
sock->kdc_socket->kdc->task->event_ctx,
sock->dgram);
if (subreq == NULL) {
task_server_terminate(sock->kdc_socket->kdc->task,
"no memory for tdgram_recvfrom_send",
true);
return;
}
tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
}
static void kdc_udp_call_proxy_done(struct tevent_req *subreq)
{
struct kdc_udp_call *call =
tevent_req_callback_data(subreq,
struct kdc_udp_call);
NTSTATUS status;
status = kdc_udp_proxy_recv(subreq, call, &call->out);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
/* generate an error packet */
status = kdc_proxy_unavailable_error(call->sock->kdc_socket->kdc,
call, &call->out);
}
if (!NT_STATUS_IS_OK(status)) {
talloc_free(call);
return;
}
subreq = tdgram_sendto_queue_send(call,
call->sock->kdc_socket->kdc->task->event_ctx,
call->sock->dgram,
call->sock->send_queue,
call->out.data,
call->out.length,
call->src);
if (subreq == NULL) {
talloc_free(call);
return;
}
tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
}
static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
{
struct kdc_udp_call *call = tevent_req_callback_data(subreq,
struct kdc_udp_call);
int sys_errno;
tdgram_sendto_queue_recv(subreq, &sys_errno);
/* We don't care about errors */
talloc_free(call);
}
/*
start listening on the given address
*/
static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
const struct model_ops *model_ops,
const char *name,
const char *address,
uint16_t port,
kdc_process_fn_t process,
bool udp_only)
{
struct kdc_socket *kdc_socket;
struct kdc_udp_socket *kdc_udp_socket;
struct tevent_req *udpsubreq;
NTSTATUS status;
int ret;
kdc_socket = talloc(kdc, struct kdc_socket);
NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
kdc_socket->kdc = kdc;
kdc_socket->process = process;
ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
address, port,
&kdc_socket->local_address);
if (ret != 0) {
status = map_nt_error_from_unix_common(errno);
return status;
}
if (!udp_only) {
status = stream_setup_socket(kdc->task,
kdc->task->event_ctx,
kdc->task->lp_ctx,
model_ops,
&kdc_tcp_stream_ops,
"ip", address, &port,
lpcfg_socket_options(kdc->task->lp_ctx),
kdc_socket);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
address, port, nt_errstr(status)));
talloc_free(kdc_socket);
return status;
}
}
kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
kdc_udp_socket->kdc_socket = kdc_socket;
ret = tdgram_inet_udp_socket(kdc_socket->local_address,
NULL,
kdc_udp_socket,
&kdc_udp_socket->dgram);
if (ret != 0) {
status = map_nt_error_from_unix_common(errno);
DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
address, port, nt_errstr(status)));
return status;
}
kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
"kdc_udp_send_queue");
NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
kdc->task->event_ctx,
kdc_udp_socket->dgram);
NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
return NT_STATUS_OK;
}
/*
setup our listening sockets on the configured network interfaces
*/

615
source4/kdc/kdc-server.c Normal file
View File

@ -0,0 +1,615 @@
/*
Unix SMB/CIFS implementation.
KDC related functions
Copyright (c) 2005-2008 Andrew Bartlett <abartlet@samba.org>
Copyright (c) 2005 Andrew Tridgell <tridge@samba.org>
Copyright (c) 2005 Stefan Metzmacher <metze@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "param/param.h"
#include "smbd/process_model.h"
#include "lib/tsocket/tsocket.h"
#include "libcli/util/tstream.h"
#include "kdc/kdc-server.h"
#include "kdc/kdc-proxy.h"
#include "lib/stream/packet.h"
/*
* State of an open tcp connection
*/
struct kdc_tcp_connection {
/* stream connection we belong to */
struct stream_connection *conn;
/* the kdc_server the connection belongs to */
struct kdc_socket *kdc_socket;
struct tstream_context *tstream;
struct tevent_queue *send_queue;
};
struct kdc_tcp_call {
struct kdc_tcp_connection *kdc_conn;
DATA_BLOB in;
DATA_BLOB out;
uint8_t out_hdr[4];
struct iovec out_iov[2];
};
struct kdc_udp_call {
struct kdc_udp_socket *sock;
struct tsocket_address *src;
DATA_BLOB in;
DATA_BLOB out;
};
static void kdc_udp_call_proxy_done(struct tevent_req *subreq);
static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
static void kdc_tcp_call_proxy_done(struct tevent_req *subreq);
static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdc_conn,
const char *reason)
{
stream_terminate_connection(kdc_conn->conn, reason);
}
static NTSTATUS kdc_proxy_unavailable_error(struct kdc_server *kdc,
TALLOC_CTX *mem_ctx,
DATA_BLOB *out)
{
krb5_error_code code;
krb5_data enc_error;
code = smb_krb5_mk_error(kdc->smb_krb5_context->krb5_context,
KRB5KDC_ERR_SVC_UNAVAILABLE,
NULL,
NULL,
&enc_error);
if (code != 0) {
DBG_WARNING("Unable to form krb5 error reply\n");
return NT_STATUS_INTERNAL_ERROR;
}
*out = data_blob_talloc(mem_ctx, enc_error.data, enc_error.length);
kerberos_free_data_contents(kdc->smb_krb5_context->krb5_context,
&enc_error);
if (!out->data) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
static void kdc_udp_call_loop(struct tevent_req *subreq)
{
struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
struct kdc_udp_socket);
struct kdc_udp_call *call;
uint8_t *buf;
ssize_t len;
int sys_errno;
kdc_code ret;
call = talloc(sock, struct kdc_udp_call);
if (call == NULL) {
talloc_free(call);
goto done;
}
call->sock = sock;
len = tdgram_recvfrom_recv(subreq, &sys_errno,
call, &buf, &call->src);
TALLOC_FREE(subreq);
if (len == -1) {
talloc_free(call);
goto done;
}
call->in.data = buf;
call->in.length = len;
DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
(long)call->in.length,
tsocket_address_string(call->src, call)));
/* Call krb5 */
ret = sock->kdc_socket->process(sock->kdc_socket->kdc,
call,
&call->in,
&call->out,
call->src,
sock->kdc_socket->local_address,
1 /* Datagram */);
if (ret == KDC_ERROR) {
talloc_free(call);
goto done;
}
if (ret == KDC_PROXY_REQUEST) {
uint16_t port;
if (!sock->kdc_socket->kdc->am_rodc) {
DEBUG(0,("kdc_udp_call_loop: proxying requested when not RODC"));
talloc_free(call);
goto done;
}
port = tsocket_address_inet_port(sock->kdc_socket->local_address);
subreq = kdc_udp_proxy_send(call,
sock->kdc_socket->kdc->task->event_ctx,
sock->kdc_socket->kdc,
port,
call->in);
if (subreq == NULL) {
talloc_free(call);
goto done;
}
tevent_req_set_callback(subreq, kdc_udp_call_proxy_done, call);
goto done;
}
subreq = tdgram_sendto_queue_send(call,
sock->kdc_socket->kdc->task->event_ctx,
sock->dgram,
sock->send_queue,
call->out.data,
call->out.length,
call->src);
if (subreq == NULL) {
talloc_free(call);
goto done;
}
tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
done:
subreq = tdgram_recvfrom_send(sock,
sock->kdc_socket->kdc->task->event_ctx,
sock->dgram);
if (subreq == NULL) {
task_server_terminate(sock->kdc_socket->kdc->task,
"no memory for tdgram_recvfrom_send",
true);
return;
}
tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
}
static void kdc_udp_call_proxy_done(struct tevent_req *subreq)
{
struct kdc_udp_call *call =
tevent_req_callback_data(subreq,
struct kdc_udp_call);
NTSTATUS status;
status = kdc_udp_proxy_recv(subreq, call, &call->out);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
/* generate an error packet */
status = kdc_proxy_unavailable_error(call->sock->kdc_socket->kdc,
call, &call->out);
}
if (!NT_STATUS_IS_OK(status)) {
talloc_free(call);
return;
}
subreq = tdgram_sendto_queue_send(call,
call->sock->kdc_socket->kdc->task->event_ctx,
call->sock->dgram,
call->sock->send_queue,
call->out.data,
call->out.length,
call->src);
if (subreq == NULL) {
talloc_free(call);
return;
}
tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
}
static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
{
struct kdc_udp_call *call = tevent_req_callback_data(subreq,
struct kdc_udp_call);
int sys_errno;
tdgram_sendto_queue_recv(subreq, &sys_errno);
/* We don't care about errors */
talloc_free(call);
}
static void kdc_tcp_call_loop(struct tevent_req *subreq)
{
struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
struct kdc_tcp_connection);
struct kdc_tcp_call *call;
NTSTATUS status;
kdc_code ret;
call = talloc(kdc_conn, struct kdc_tcp_call);
if (call == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for kdc_tcp_call");
return;
}
call->kdc_conn = kdc_conn;
status = tstream_read_pdu_blob_recv(subreq,
call,
&call->in);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
const char *reason;
reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
"tstream_read_pdu_blob_recv() - %s",
nt_errstr(status));
if (!reason) {
reason = nt_errstr(status);
}
kdc_tcp_terminate_connection(kdc_conn, reason);
return;
}
DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
(long) call->in.length,
tsocket_address_string(kdc_conn->conn->remote_address, call)));
/* skip length header */
call->in.data +=4;
call->in.length -= 4;
/* Call krb5 */
ret = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
call,
&call->in,
&call->out,
kdc_conn->conn->remote_address,
kdc_conn->conn->local_address,
0 /* Stream */);
if (ret == KDC_ERROR) {
kdc_tcp_terminate_connection(kdc_conn,
"kdc_tcp_call_loop: process function failed");
return;
}
if (ret == KDC_PROXY_REQUEST) {
uint16_t port;
if (!kdc_conn->kdc_socket->kdc->am_rodc) {
kdc_tcp_terminate_connection(kdc_conn,
"kdc_tcp_call_loop: proxying requested when not RODC");
return;
}
port = tsocket_address_inet_port(kdc_conn->conn->local_address);
subreq = kdc_tcp_proxy_send(call,
kdc_conn->conn->event.ctx,
kdc_conn->kdc_socket->kdc,
port,
call->in);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn,
"kdc_tcp_call_loop: kdc_tcp_proxy_send failed");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_proxy_done, call);
return;
}
/* First add the length of the out buffer */
RSIVAL(call->out_hdr, 0, call->out.length);
call->out_iov[0].iov_base = (char *) call->out_hdr;
call->out_iov[0].iov_len = 4;
call->out_iov[1].iov_base = (char *) call->out.data;
call->out_iov[1].iov_len = call->out.length;
subreq = tstream_writev_queue_send(call,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
kdc_conn->send_queue,
call->out_iov, 2);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_writev_queue_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
/*
* The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(kdc_conn,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
kdc_conn);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
}
static void kdc_tcp_call_proxy_done(struct tevent_req *subreq)
{
struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
struct kdc_tcp_call);
struct kdc_tcp_connection *kdc_conn = call->kdc_conn;
NTSTATUS status;
status = kdc_tcp_proxy_recv(subreq, call, &call->out);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
/* generate an error packet */
status = kdc_proxy_unavailable_error(kdc_conn->kdc_socket->kdc,
call, &call->out);
}
if (!NT_STATUS_IS_OK(status)) {
const char *reason;
reason = talloc_asprintf(call, "kdc_tcp_call_proxy_done: "
"kdc_proxy_unavailable_error - %s",
nt_errstr(status));
if (!reason) {
reason = "kdc_tcp_call_proxy_done: kdc_proxy_unavailable_error() failed";
}
kdc_tcp_terminate_connection(call->kdc_conn, reason);
return;
}
/* First add the length of the out buffer */
RSIVAL(call->out_hdr, 0, call->out.length);
call->out_iov[0].iov_base = (char *) call->out_hdr;
call->out_iov[0].iov_len = 4;
call->out_iov[1].iov_base = (char *) call->out.data;
call->out_iov[1].iov_len = call->out.length;
subreq = tstream_writev_queue_send(call,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
kdc_conn->send_queue,
call->out_iov, 2);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_writev_queue_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
/*
* The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(kdc_conn,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
kdc_conn);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
}
static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
{
struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
struct kdc_tcp_call);
int sys_errno;
int rc;
rc = tstream_writev_queue_recv(subreq, &sys_errno);
TALLOC_FREE(subreq);
if (rc == -1) {
const char *reason;
reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
"tstream_writev_queue_recv() - %d:%s",
sys_errno, strerror(sys_errno));
if (!reason) {
reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
}
kdc_tcp_terminate_connection(call->kdc_conn, reason);
return;
}
/* We don't care about errors */
talloc_free(call);
}
/*
called when we get a new connection
*/
static void kdc_tcp_accept(struct stream_connection *conn)
{
struct kdc_socket *kdc_socket;
struct kdc_tcp_connection *kdc_conn;
struct tevent_req *subreq;
int rc;
kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
if (kdc_conn == NULL) {
stream_terminate_connection(conn,
"kdc_tcp_accept: out of memory");
return;
}
kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
if (kdc_conn->send_queue == NULL) {
stream_terminate_connection(conn,
"kdc_tcp_accept: out of memory");
return;
}
kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
TALLOC_FREE(conn->event.fde);
rc = tstream_bsd_existing_socket(kdc_conn,
socket_get_fd(conn->socket),
&kdc_conn->tstream);
if (rc < 0) {
stream_terminate_connection(conn,
"kdc_tcp_accept: out of memory");
return;
}
kdc_conn->conn = conn;
kdc_conn->kdc_socket = kdc_socket;
conn->private_data = kdc_conn;
/*
* The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
* packet_full_request_u32 provides the pdu length then.
*/
subreq = tstream_read_pdu_blob_send(kdc_conn,
kdc_conn->conn->event.ctx,
kdc_conn->tstream,
4, /* initial_read_size */
packet_full_request_u32,
kdc_conn);
if (subreq == NULL) {
kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
"no memory for tstream_read_pdu_blob_send");
return;
}
tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
}
static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
struct kdc_tcp_connection);
/* this should never be triggered! */
kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
}
static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
{
struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
struct kdc_tcp_connection);
/* this should never be triggered! */
kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
}
static const struct stream_server_ops kdc_tcp_stream_ops = {
.name = "kdc_tcp",
.accept_connection = kdc_tcp_accept,
.recv_handler = kdc_tcp_recv,
.send_handler = kdc_tcp_send
};
/*
* Start listening on the given address
*/
NTSTATUS kdc_add_socket(struct kdc_server *kdc,
const struct model_ops *model_ops,
const char *name,
const char *address,
uint16_t port,
kdc_process_fn_t process,
bool udp_only)
{
struct kdc_socket *kdc_socket;
struct kdc_udp_socket *kdc_udp_socket;
struct tevent_req *udpsubreq;
NTSTATUS status;
int ret;
kdc_socket = talloc(kdc, struct kdc_socket);
NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
kdc_socket->kdc = kdc;
kdc_socket->process = process;
ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
address, port,
&kdc_socket->local_address);
if (ret != 0) {
status = map_nt_error_from_unix_common(errno);
return status;
}
if (!udp_only) {
status = stream_setup_socket(kdc->task,
kdc->task->event_ctx,
kdc->task->lp_ctx,
model_ops,
&kdc_tcp_stream_ops,
"ip", address, &port,
lpcfg_socket_options(kdc->task->lp_ctx),
kdc_socket);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
address, port, nt_errstr(status)));
talloc_free(kdc_socket);
return status;
}
}
kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
kdc_udp_socket->kdc_socket = kdc_socket;
ret = tdgram_inet_udp_socket(kdc_socket->local_address,
NULL,
kdc_udp_socket,
&kdc_udp_socket->dgram);
if (ret != 0) {
status = map_nt_error_from_unix_common(errno);
DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
address, port, nt_errstr(status)));
return status;
}
kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
"kdc_udp_send_queue");
NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
kdc->task->event_ctx,
kdc_udp_socket->dgram);
NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
return NT_STATUS_OK;
}

10
source4/kdc/kdc-server.h
View File

@ -25,8 +25,10 @@
#define _KDC_SERVER_H
#include "system/kerberos.h"
#include "auth/kerberos/kerberos.h"
struct tsocket_address;
struct model_ops;
/*
* Context structure for the kdc server
@ -69,4 +71,12 @@ struct kdc_udp_socket {
struct tevent_queue *send_queue;
};
NTSTATUS kdc_add_socket(struct kdc_server *kdc,
const struct model_ops *model_ops,
const char *name,
const char *address,
uint16_t port,
kdc_process_fn_t process,
bool udp_only);
#endif /* _KDC_SERVER_H */

16
source4/kdc/wscript_build
View File

@ -7,7 +7,7 @@ else:
kdc_include = getattr(bld.env, "CPPPATH_KDC")
bld.SAMBA_MODULE('service_kdc',
source='kdc-heimdal.c kpasswd-heimdal.c kdc-proxy.c',
source='kdc-heimdal.c kpasswd-heimdal.c',
subsystem='service',
init_function='server_service_kdc_init',
deps='''
@ -15,12 +15,11 @@ bld.SAMBA_MODULE('service_kdc',
HDB_SAMBA4
WDC_SAMBA4
samba-hostconfig
LIBTSOCKET
LIBSAMBA_TSOCKET
com_err
samba_server_gensec
PAC_GLUE
KDC-GLUE
KDC-SERVER
KPASSWD_GLUE
''',
internal_module=False)
@ -44,6 +43,17 @@ bld.SAMBA_LIBRARY('HDB_SAMBA4_PLUGIN',
enabled = (bld.CONFIG_SET("USING_SYSTEM_KRB5") and bld.CONFIG_SET("USING_SYSTEM_HDB"))
)
bld.SAMBA_SUBSYSTEM('KDC-SERVER',
source='kdc-server.c kdc-proxy.c',
includes=kdc_include,
deps='''
krb5samba
ldb
LIBTSOCKET
LIBSAMBA_TSOCKET
''',
enabled=bld.CONFIG_SET('SAMBA4_USES_HEIMDAL'))
bld.SAMBA_SUBSYSTEM('KDC-GLUE',
source='kdc-glue.c',
includes=kdc_include,