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-rw-r--r--source4/ntp_signd/ntp_signd.c151
1 files changed, 134 insertions, 17 deletions
diff --git a/source4/ntp_signd/ntp_signd.c b/source4/ntp_signd/ntp_signd.c
index 35016d5c61..fdd97e475c 100644
--- a/source4/ntp_signd/ntp_signd.c
+++ b/source4/ntp_signd/ntp_signd.c
@@ -34,6 +34,8 @@
#include "libcli/security/security.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
+#include "lib/crypto/md5.h"
+#include "system/passwd.h"
/*
top level context structure for the ntp_signd server
@@ -61,27 +63,76 @@ static void ntp_signd_terminate_connection(struct ntp_signd_connection *ntp_sign
stream_terminate_connection(ntp_signdconn->conn, reason);
}
+static NTSTATUS signing_failure(struct ntp_signd_connection *ntp_signdconn,
+ uint32_t packet_id)
+{
+ NTSTATUS status;
+ struct signed_reply signed_reply;
+ TALLOC_CTX *tmp_ctx = talloc_new(ntp_signdconn);
+ DATA_BLOB reply, blob;
+ enum ndr_err_code ndr_err;
+
+ NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+ signed_reply.version = 1;
+ signed_reply.op = SIGNING_FAILURE;
+ signed_reply.packet_id = packet_id;
+ signed_reply.signed_packet = data_blob(NULL, 0);
+
+ ndr_err = ndr_push_struct_blob(&reply, tmp_ctx,
+ lp_iconv_convenience(ntp_signdconn->ntp_signd->task->lp_ctx),
+ &signed_reply,
+ (ndr_push_flags_fn_t)ndr_push_signed_reply);
+
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ DEBUG(1,("failed to push ntp error reply\n"));
+ talloc_free(tmp_ctx);
+ return ndr_map_error2ntstatus(ndr_err);
+ }
+
+ blob = data_blob_talloc(ntp_signdconn, NULL, reply.length + 4);
+ if (!blob.data) {
+ talloc_free(tmp_ctx);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ RSIVAL(blob.data, 0, reply.length);
+ memcpy(blob.data + 4, reply.data, reply.length);
+
+ status = packet_send(ntp_signdconn->packet, blob);
+
+ /* the call isn't needed any more */
+ talloc_free(tmp_ctx);
+
+ return status;
+}
+
/*
receive a full packet on a NTP_SIGND connection
*/
-static NTSTATUS ntp_signd_recv(void *private, DATA_BLOB blob)
+static NTSTATUS ntp_signd_recv(void *private, DATA_BLOB wrapped_input)
{
struct ntp_signd_connection *ntp_signdconn = talloc_get_type(private,
struct ntp_signd_connection);
NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
TALLOC_CTX *tmp_ctx = talloc_new(ntp_signdconn);
- DATA_BLOB input, reply;
+ DATA_BLOB input, output, wrapped_output;
const struct dom_sid *domain_sid;
struct dom_sid *sid;
struct sign_request sign_request;
+ struct signed_reply signed_reply;
enum ndr_err_code ndr_err;
struct ldb_result *res;
const char *attrs[] = { "unicodePwd", NULL };
+ struct MD5Context ctx;
+ struct samr_Password *nt_hash;
int ret;
- talloc_steal(tmp_ctx, blob.data);
+ NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+ talloc_steal(tmp_ctx, wrapped_input.data);
- input = data_blob_const(blob.data + 4, blob.length - 4);
+ input = data_blob_const(wrapped_input.data + 4, wrapped_input.length - 4);
ndr_err = ndr_pull_struct_blob_all(&input, tmp_ctx,
lp_iconv_convenience(ntp_signdconn->ntp_signd->task->lp_ctx),
@@ -94,43 +145,98 @@ static NTSTATUS ntp_signd_recv(void *private, DATA_BLOB blob)
return ndr_map_error2ntstatus(ndr_err);
}
+ /* We need to implement 'check signature' and 'request server
+ * to sign' operations at some point */
+ if (sign_request.op != SIGN_TO_CLIENT) {
+ talloc_free(tmp_ctx);
+ return signing_failure(ntp_signdconn, sign_request.packet_id);
+ }
+
domain_sid = samdb_domain_sid(ntp_signdconn->ntp_signd->samdb);
if (!domain_sid) {
- return NT_STATUS_INVALID_PARAMETER;
+ talloc_free(tmp_ctx);
+ return signing_failure(ntp_signdconn, sign_request.packet_id);
}
+ /* The top bit is a 'key selector' */
sid = dom_sid_add_rid(tmp_ctx, domain_sid, sign_request.key_id & 0x7FFFFFFF);
if (!sid) {
- return NT_STATUS_NO_MEMORY;
+ talloc_free(tmp_ctx);
+ return signing_failure(ntp_signdconn, sign_request.packet_id);
}
- /* Sign packet */
ret = ldb_search_exp_fmt(ntp_signdconn->ntp_signd->samdb, tmp_ctx,
&res, samdb_base_dn(ntp_signdconn->ntp_signd->samdb),
LDB_SCOPE_SUBTREE, attrs, "(&(objectSid=%s)(objectClass=computer))",
dom_sid_string(tmp_ctx, sid));
if (ret != LDB_SUCCESS) {
- return NT_STATUS_UNSUCCESSFUL;
+ DEBUG(2, ("Failed to search for SID %s in SAM for NTP signing: %s\n", dom_sid_string(tmp_ctx, sid),
+ ldb_errstring(ntp_signdconn->ntp_signd->samdb)));
+ talloc_free(tmp_ctx);
+ return signing_failure(ntp_signdconn, sign_request.packet_id);
+ }
+
+ if (res->count == 0) {
+ DEBUG(5, ("Failed to find SID %s in SAM for NTP signing\n", dom_sid_string(tmp_ctx, sid)));
+ } else if (res->count != 1) {
+ DEBUG(1, ("Found SID %s %u times in SAM for NTP signing\n", dom_sid_string(tmp_ctx, sid), res->count));
+ talloc_free(tmp_ctx);
+ return signing_failure(ntp_signdconn, sign_request.packet_id);
+ }
+
+ nt_hash = samdb_result_hash(tmp_ctx, res->msgs[0], "unicodePwd");
+ if (!nt_hash) {
+ DEBUG(1, ("No unicodePwd found on record of SID %s for NTP signing\n", dom_sid_string(tmp_ctx, sid)));
+ talloc_free(tmp_ctx);
+ return signing_failure(ntp_signdconn, sign_request.packet_id);
}
- if (res->count != 1) {
- return NT_STATUS_NO_SUCH_USER;
+ /* Generate the reply packet */
+ signed_reply.version = 1;
+ signed_reply.packet_id = sign_request.packet_id;
+ signed_reply.op = SIGNING_SUCCESS;
+ signed_reply.signed_packet = data_blob_talloc(tmp_ctx,
+ NULL,
+ sign_request.packet_to_sign.length + 20);
+
+ if (!signed_reply.signed_packet.data) {
+ talloc_free(tmp_ctx);
+ return signing_failure(ntp_signdconn, sign_request.packet_id);
}
+ memcpy(signed_reply.signed_packet.data, sign_request.packet_to_sign.data, sign_request.packet_to_sign.length);
+ SIVAL(signed_reply.signed_packet.data, sign_request.packet_to_sign.length, sign_request.key_id);
+
/* Sign the NTP response with the unicodePwd */
+ MD5Init(&ctx);
+ MD5Update(&ctx, nt_hash->hash, sizeof(nt_hash->hash));
+ MD5Update(&ctx, sign_request.packet_to_sign.data, sign_request.packet_to_sign.length);
+ MD5Final(signed_reply.signed_packet.data + sign_request.packet_to_sign.length + 4, &ctx);
+
/* Place it into the packet for the wire */
+ ndr_err = ndr_push_struct_blob(&output, tmp_ctx,
+ lp_iconv_convenience(ntp_signdconn->ntp_signd->task->lp_ctx),
+ &signed_reply,
+ (ndr_push_flags_fn_t)ndr_push_signed_reply);
- blob = data_blob_talloc(ntp_signdconn, NULL, reply.length + 4);
- if (!blob.data) {
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ DEBUG(1,("failed to push ntp error reply\n"));
+ talloc_free(tmp_ctx);
+ return ndr_map_error2ntstatus(ndr_err);
+ }
+
+ wrapped_output = data_blob_talloc(ntp_signdconn, NULL, output.length + 4);
+ if (!wrapped_output.data) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
- RSIVAL(blob.data, 0, reply.length);
- memcpy(blob.data + 4, reply.data, reply.length);
+ /* The 'wire' transport for this is wrapped with a 4 byte network byte order length */
+ RSIVAL(wrapped_output.data, 0, output.length);
+ memcpy(wrapped_output.data + 4, output.data, output.length);
- status = packet_send(ntp_signdconn->packet, blob);
+ status = packet_send(ntp_signdconn->packet, wrapped_output);
/* the call isn't needed any more */
talloc_free(tmp_ctx);
@@ -215,7 +321,15 @@ static void ntp_signd_task_init(struct task_server *task)
const struct model_ops *model_ops;
- const char *address = "/tmp/ux_demo";
+ const char *address;
+
+ if (!directory_create_or_exist(lp_ntp_signd_socket_directory(task->lp_ctx), geteuid(), 0755)) {
+ char *error = talloc_asprintf(task, "Cannot create NTP signd pipe directory: %s",
+ lp_ntp_signd_socket_directory(task->lp_ctx));
+ task_server_terminate(task,
+ error);
+ return;
+ }
/* within the ntp_signd task we want to be a single process, so
ask for the single process model ops and pass these to the
@@ -236,12 +350,15 @@ static void ntp_signd_task_init(struct task_server *task)
ntp_signd->task = task;
- ntp_signd->samdb = samdb_connect(ntp_signd, task->event_ctx, task->lp_ctx, anonymous_session(ntp_signd, task->event_ctx, task->lp_ctx));
+ /* Must be system to get at the password hashes */
+ ntp_signd->samdb = samdb_connect(ntp_signd, task->event_ctx, task->lp_ctx, system_session(ntp_signd, task->lp_ctx));
if (ntp_signd->samdb == NULL) {
task_server_terminate(task, "ntp_signd failed to open samdb");
return;
}
+ address = talloc_asprintf(ntp_signd, "%s/socket", lp_ntp_signd_socket_directory(task->lp_ctx));
+
status = stream_setup_socket(ntp_signd->task->event_ctx,
ntp_signd->task->lp_ctx,
model_ops,
generated by cgit (git 2.34.1) at 2024-12-02 23:29:18 +0000