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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:47:29 +0000
commit4f5791ebd03eaec1c7da0865a383175b05102712 (patch)
tree8ce7b00f7a76baa386372422adebbe64510812d4 /source3/auth/auth_samba4.c
parentInitial commit. (diff)
downloadsamba-upstream.tar.xz
samba-upstream.zip
Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'source3/auth/auth_samba4.c')
-rw-r--r--source3/auth/auth_samba4.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/source3/auth/auth_samba4.c b/source3/auth/auth_samba4.c
new file mode 100644
index 0000000..6c017ef
--- /dev/null
+++ b/source3/auth/auth_samba4.c
@@ -0,0 +1,398 @@
+/*
+ Unix SMB/CIFS implementation.
+ Authenticate against Samba4's auth subsystem
+ Copyright (C) Volker Lendecke 2008
+ Copyright (C) Andrew Bartlett 2010
+
+ 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 "source3/include/auth.h"
+#include "source3/include/messages.h"
+#include "source4/auth/auth.h"
+#include "auth/auth_sam_reply.h"
+#include "param/param.h"
+#include "source4/lib/events/events.h"
+#include "source4/lib/messaging/messaging.h"
+#include "auth/gensec/gensec.h"
+#include "auth/credentials/credentials.h"
+#include "lib/global_contexts.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+static NTSTATUS make_auth4_context_s4(const struct auth_context *auth_context,
+ TALLOC_CTX *mem_ctx,
+ struct auth4_context **auth4_context);
+
+static struct idr_context *task_id_tree;
+
+static int free_task_id(struct server_id *server_id)
+{
+ idr_remove(task_id_tree, server_id->task_id);
+ return 0;
+}
+
+/* Return a server_id with a unique task_id element. Free the
+ * returned pointer to de-allocate the task_id via a talloc destructor
+ * (ie, use talloc_free()) */
+static struct server_id *new_server_id_task(TALLOC_CTX *mem_ctx)
+{
+ struct messaging_context *msg_ctx;
+ struct server_id *server_id;
+ int task_id;
+ if (!task_id_tree) {
+ task_id_tree = idr_init(NULL);
+ if (!task_id_tree) {
+ return NULL;
+ }
+ }
+
+ msg_ctx = global_messaging_context();
+ if (msg_ctx == NULL) {
+ return NULL;
+ }
+
+ server_id = talloc(mem_ctx, struct server_id);
+
+ if (!server_id) {
+ return NULL;
+ }
+ *server_id = messaging_server_id(msg_ctx);
+
+ /* 0 is the default server_id, so we need to start with 1 */
+ task_id = idr_get_new_above(task_id_tree, server_id, 1, INT32_MAX);
+
+ if (task_id == -1) {
+ talloc_free(server_id);
+ return NULL;
+ }
+
+ talloc_set_destructor(server_id, free_task_id);
+ server_id->task_id = task_id;
+ return server_id;
+}
+
+/*
+ * This module is not an ordinary authentication module. It is really
+ * a way to redirect the whole authentication and authorization stack
+ * to use the source4 auth code, not a way to just handle NTLM
+ * authentication.
+ *
+ * See the comments above each function for how that hook changes the
+ * behaviour.
+ */
+
+/*
+ * This hook is currently used by winbindd only, as all other NTLM
+ * logins go via the hooks provided by make_auth4_context_s4() below.
+ *
+ * This is only left in case we find a way that it might become useful
+ * in future. Importantly, this routine returns the information
+ * needed for a NETLOGON SamLogon, not what is needed to establish a
+ * session.
+ *
+ * We expect we may use this hook in the source3/ winbind when this
+ * services the AD DC. It is tested via pdbtest.
+ */
+
+static NTSTATUS check_samba4_security(
+ const struct auth_context *auth_context,
+ void *my_private_data,
+ TALLOC_CTX *mem_ctx,
+ const struct auth_usersupplied_info *user_info,
+ struct auth_serversupplied_info **pserver_info)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct netr_SamInfo3 *info3 = NULL;
+ NTSTATUS nt_status;
+ struct auth_user_info_dc *user_info_dc;
+ struct auth4_context *auth4_context;
+ uint8_t authoritative = 1;
+ struct auth_serversupplied_info *server_info = NULL;
+
+ nt_status = make_auth4_context_s4(auth_context, mem_ctx, &auth4_context);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ TALLOC_FREE(frame);
+ goto done;
+ }
+
+ nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4");
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ TALLOC_FREE(auth4_context);
+ TALLOC_FREE(frame);
+ return nt_status;
+ }
+
+ nt_status = auth_check_password(auth4_context, auth4_context, user_info,
+ &user_info_dc, &authoritative);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) &&
+ authoritative == 0)
+ {
+ nt_status = NT_STATUS_NOT_IMPLEMENTED;
+ }
+ TALLOC_FREE(auth4_context);
+ TALLOC_FREE(frame);
+ return nt_status;
+ }
+
+ nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx,
+ user_info_dc,
+ &info3);
+ if (NT_STATUS_IS_OK(nt_status)) {
+ /* We need the strings from the server_info to be valid as long as the info3 is around */
+ talloc_steal(info3, user_info_dc);
+ }
+ talloc_free(auth4_context);
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ goto done;
+ }
+
+ if (user_info->flags & USER_INFO_INFO3_AND_NO_AUTHZ) {
+ server_info = make_server_info(mem_ctx);
+ if (server_info == NULL) {
+ nt_status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+ server_info->info3 = talloc_move(server_info, &info3);
+ } else {
+ nt_status = make_server_info_info3(
+ mem_ctx,
+ user_info->client.account_name,
+ user_info->mapped.domain_name,
+ &server_info,
+ info3);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(10, ("make_server_info_info3 failed: %s\n",
+ nt_errstr(nt_status)));
+ goto done;
+ }
+ }
+
+ *pserver_info = server_info;
+ nt_status = NT_STATUS_OK;
+
+ done:
+ TALLOC_FREE(frame);
+ return nt_status;
+}
+
+/*
+ * Hook to allow the source4 set of GENSEC modules to handle
+ * blob-based authentication mechanisms, without directly linking the
+ * mechanism code.
+ *
+ * This may eventually go away, when the GSSAPI acceptors are merged,
+ * when we will just rely on the make_auth4_context_s4 hook instead.
+ *
+ * Even for NTLMSSP, which has a common module, significant parts of
+ * the behaviour are overridden here, because it uses the source4 NTLM
+ * stack and the source4 mapping between the PAC/SamLogon response and
+ * the local token.
+ *
+ * It is important to override all this to ensure that the exact same
+ * token is generated and used in the SMB and LDAP servers, for NTLM
+ * and for Kerberos.
+ */
+static NTSTATUS prepare_gensec(const struct auth_context *auth_context,
+ TALLOC_CTX *mem_ctx,
+ struct gensec_security **gensec_context)
+{
+ NTSTATUS status;
+ struct loadparm_context *lp_ctx;
+ struct tevent_context *event_ctx;
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct gensec_security *gensec_ctx;
+ struct imessaging_context *msg_ctx;
+ struct cli_credentials *server_credentials;
+ struct server_id *server_id;
+
+ lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
+ if (lp_ctx == NULL) {
+ DEBUG(1, ("loadparm_init_s3 failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+ event_ctx = s4_event_context_init(frame);
+ if (event_ctx == NULL) {
+ DEBUG(1, ("s4_event_context_init failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+
+ server_id = new_server_id_task(frame);
+ if (server_id == NULL) {
+ DEBUG(1, ("new_server_id_task failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+
+ msg_ctx = imessaging_init_discard_incoming(frame,
+ lp_ctx,
+ *server_id,
+ event_ctx);
+ if (msg_ctx == NULL) {
+ DEBUG(1, ("imessaging_init_discard_incoming failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+
+ talloc_reparent(frame, msg_ctx, server_id);
+
+ server_credentials
+ = cli_credentials_init_server(frame, lp_ctx);
+ if (!server_credentials) {
+ DEBUG(1, ("Failed to init server credentials"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+
+ status = samba_server_gensec_start(mem_ctx,
+ event_ctx, msg_ctx,
+ lp_ctx, server_credentials, "cifs",
+ &gensec_ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
+ TALLOC_FREE(frame);
+ return status;
+ }
+
+ talloc_reparent(frame, gensec_ctx, msg_ctx);
+ talloc_reparent(frame, gensec_ctx, event_ctx);
+ talloc_reparent(frame, gensec_ctx, lp_ctx);
+ talloc_reparent(frame, gensec_ctx, server_credentials);
+
+ gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
+ gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN);
+
+ *gensec_context = gensec_ctx;
+ TALLOC_FREE(frame);
+ return status;
+}
+
+/*
+ * Hook to allow handling of NTLM authentication for AD operation
+ * without directly linking the s4 auth stack
+ *
+ * This ensures we use the source4 authentication stack, as well as
+ * the authorization stack to create the user's token. This ensures
+ * consistency between NTLM logins and NTLMSSP logins, as NTLMSSP is
+ * handled by the hook above.
+ */
+static NTSTATUS make_auth4_context_s4(const struct auth_context *auth_context,
+ TALLOC_CTX *mem_ctx,
+ struct auth4_context **auth4_context)
+{
+ NTSTATUS status;
+ struct loadparm_context *lp_ctx;
+ struct tevent_context *event_ctx;
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct imessaging_context *msg_ctx;
+ struct server_id *server_id;
+
+ lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
+ if (lp_ctx == NULL) {
+ DEBUG(1, ("loadparm_init_s3 failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+ event_ctx = s4_event_context_init(frame);
+ if (event_ctx == NULL) {
+ DEBUG(1, ("s4_event_context_init failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+
+ server_id = new_server_id_task(frame);
+ if (server_id == NULL) {
+ DEBUG(1, ("new_server_id_task failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+
+ msg_ctx = imessaging_init_discard_incoming(frame,
+ lp_ctx,
+ *server_id,
+ event_ctx);
+ if (msg_ctx == NULL) {
+ DEBUG(1, ("imessaging_init_discard_incoming failed\n"));
+ TALLOC_FREE(frame);
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+ talloc_reparent(frame, msg_ctx, server_id);
+
+ /* Allow forcing a specific auth4 module */
+ if (!auth_context->forced_samba4_methods) {
+ status = auth_context_create(mem_ctx,
+ event_ctx,
+ msg_ctx,
+ lp_ctx,
+ auth4_context);
+ } else {
+ const char * const *forced_auth_methods = (const char * const *)str_list_make(mem_ctx, auth_context->forced_samba4_methods, NULL);
+ status = auth_context_create_methods(mem_ctx, forced_auth_methods, event_ctx, msg_ctx, lp_ctx, NULL, auth4_context);
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status)));
+ TALLOC_FREE(frame);
+ return status;
+ }
+
+ talloc_reparent(frame, *auth4_context, msg_ctx);
+ talloc_reparent(frame, *auth4_context, event_ctx);
+ talloc_reparent(frame, *auth4_context, lp_ctx);
+
+ TALLOC_FREE(frame);
+ return status;
+}
+
+/* module initialisation */
+static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
+ const char *param,
+ struct auth_methods **auth_method)
+{
+ struct auth_methods *result;
+
+ gensec_init();
+
+ result = talloc_zero(auth_context, struct auth_methods);
+ if (result == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ result->name = "samba4";
+ result->auth = check_samba4_security;
+ result->prepare_gensec = prepare_gensec;
+ result->make_auth4_context = make_auth4_context_s4;
+
+ if (param && *param) {
+ auth_context->forced_samba4_methods = talloc_strdup(result, param);
+ if (!auth_context->forced_samba4_methods) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ }
+
+ *auth_method = result;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS auth_samba4_init(TALLOC_CTX *mem_ctx);
+NTSTATUS auth_samba4_init(TALLOC_CTX *mem_ctx)
+{
+ smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",
+ auth_init_samba4);
+ return NT_STATUS_OK;
+}