mirror of
https://github.com/samba-team/samba.git
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29b2dcb4f5
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
402 lines
12 KiB
C
402 lines
12 KiB
C
/*
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Unix SMB/CIFS implementation.
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Authenticate against Samba4's auth subsystem
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Copyright (C) Volker Lendecke 2008
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Copyright (C) Andrew Bartlett 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "source3/include/auth.h"
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#include "source3/include/messages.h"
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#include "source4/auth/auth.h"
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#include "auth/auth_sam_reply.h"
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#include "param/param.h"
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#include "source4/lib/events/events.h"
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#include "source4/lib/messaging/messaging.h"
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#include "auth/gensec/gensec.h"
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#include "auth/credentials/credentials.h"
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#include "lib/global_contexts.h"
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#include "lib/util/idtree.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_AUTH
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static NTSTATUS make_auth4_context_s4(const struct auth_context *auth_context,
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TALLOC_CTX *mem_ctx,
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struct auth4_context **auth4_context);
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static struct idr_context *task_id_tree;
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static int free_task_id(struct server_id *server_id)
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{
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idr_remove(task_id_tree, server_id->task_id);
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return 0;
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}
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/* Return a server_id with a unique task_id element. Free the
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* returned pointer to de-allocate the task_id via a talloc destructor
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* (ie, use talloc_free()) */
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static struct server_id *new_server_id_task(TALLOC_CTX *mem_ctx)
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{
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struct messaging_context *msg_ctx;
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struct server_id *server_id;
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int task_id;
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if (!task_id_tree) {
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task_id_tree = idr_init(NULL);
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if (!task_id_tree) {
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return NULL;
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}
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}
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msg_ctx = global_messaging_context();
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if (msg_ctx == NULL) {
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return NULL;
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}
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server_id = talloc(mem_ctx, struct server_id);
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if (!server_id) {
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return NULL;
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}
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*server_id = messaging_server_id(msg_ctx);
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/* 0 is the default server_id, so we need to start with 1 */
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task_id = idr_get_new_above(task_id_tree, server_id, 1, INT32_MAX);
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if (task_id == -1) {
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talloc_free(server_id);
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return NULL;
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}
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talloc_set_destructor(server_id, free_task_id);
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server_id->task_id = task_id;
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return server_id;
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}
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/*
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* This module is not an ordinary authentication module. It is really
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* a way to redirect the whole authentication and authorization stack
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* to use the source4 auth code, not a way to just handle NTLM
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* authentication.
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*
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* See the comments above each function for how that hook changes the
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* behaviour.
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*/
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/*
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* This hook is currently used by winbindd only, as all other NTLM
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* logins go via the hooks provided by make_auth4_context_s4() below.
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*
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* This is only left in case we find a way that it might become useful
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* in future. Importantly, this routine returns the information
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* needed for a NETLOGON SamLogon, not what is needed to establish a
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* session.
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*
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* We expect we may use this hook in the source3/ winbind when this
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* services the AD DC. It is tested via pdbtest.
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*/
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static NTSTATUS check_samba4_security(
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const struct auth_context *auth_context,
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void *my_private_data,
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TALLOC_CTX *mem_ctx,
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const struct auth_usersupplied_info *user_info,
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struct auth_serversupplied_info **pserver_info)
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{
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TALLOC_CTX *frame = talloc_stackframe();
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struct netr_SamInfo3 *info3 = NULL;
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NTSTATUS nt_status;
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struct auth_user_info_dc *user_info_dc;
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struct auth4_context *auth4_context;
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uint8_t authoritative = 1;
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struct auth_serversupplied_info *server_info = NULL;
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nt_status = make_auth4_context_s4(auth_context, mem_ctx, &auth4_context);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(frame);
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goto done;
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}
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nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4");
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(auth4_context);
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TALLOC_FREE(frame);
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return nt_status;
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}
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nt_status = auth_check_password(auth4_context, auth4_context, user_info,
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&user_info_dc, &authoritative);
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if (!NT_STATUS_IS_OK(nt_status)) {
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if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) &&
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authoritative == 0)
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{
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nt_status = NT_STATUS_NOT_IMPLEMENTED;
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}
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TALLOC_FREE(auth4_context);
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TALLOC_FREE(frame);
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return nt_status;
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}
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nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx,
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user_info_dc,
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AUTH_INCLUDE_RESOURCE_GROUPS,
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&info3,
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NULL);
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if (NT_STATUS_IS_OK(nt_status)) {
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/* We need the strings from the server_info to be valid as long as the info3 is around */
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talloc_steal(info3, user_info_dc);
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}
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talloc_free(auth4_context);
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if (!NT_STATUS_IS_OK(nt_status)) {
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goto done;
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}
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if (user_info->flags & USER_INFO_INFO3_AND_NO_AUTHZ) {
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server_info = make_server_info(mem_ctx);
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if (server_info == NULL) {
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nt_status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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server_info->info3 = talloc_move(server_info, &info3);
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} else {
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nt_status = make_server_info_info3(
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mem_ctx,
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user_info->client.account_name,
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user_info->mapped.domain_name,
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&server_info,
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info3);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(10, ("make_server_info_info3 failed: %s\n",
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nt_errstr(nt_status)));
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goto done;
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}
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}
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*pserver_info = server_info;
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nt_status = NT_STATUS_OK;
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done:
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TALLOC_FREE(frame);
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return nt_status;
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}
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/*
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* Hook to allow the source4 set of GENSEC modules to handle
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* blob-based authentication mechanisms, without directly linking the
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* mechanism code.
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*
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* This may eventually go away, when the GSSAPI acceptors are merged,
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* when we will just rely on the make_auth4_context_s4 hook instead.
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*
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* Even for NTLMSSP, which has a common module, significant parts of
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* the behaviour are overridden here, because it uses the source4 NTLM
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* stack and the source4 mapping between the PAC/SamLogon response and
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* the local token.
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*
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* It is important to override all this to ensure that the exact same
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* token is generated and used in the SMB and LDAP servers, for NTLM
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* and for Kerberos.
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*/
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static NTSTATUS prepare_gensec(const struct auth_context *auth_context,
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TALLOC_CTX *mem_ctx,
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struct gensec_security **gensec_context)
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{
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NTSTATUS status;
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struct loadparm_context *lp_ctx;
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struct tevent_context *event_ctx;
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TALLOC_CTX *frame = talloc_stackframe();
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struct gensec_security *gensec_ctx;
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struct imessaging_context *msg_ctx;
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struct cli_credentials *server_credentials;
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struct server_id *server_id;
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lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
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if (lp_ctx == NULL) {
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DEBUG(1, ("loadparm_init_s3 failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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event_ctx = s4_event_context_init(frame);
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if (event_ctx == NULL) {
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DEBUG(1, ("s4_event_context_init failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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server_id = new_server_id_task(frame);
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if (server_id == NULL) {
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DEBUG(1, ("new_server_id_task failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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msg_ctx = imessaging_init_discard_incoming(frame,
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lp_ctx,
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*server_id,
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event_ctx);
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if (msg_ctx == NULL) {
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DEBUG(1, ("imessaging_init_discard_incoming failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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talloc_reparent(frame, msg_ctx, server_id);
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server_credentials
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= cli_credentials_init_server(frame, lp_ctx);
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if (!server_credentials) {
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DEBUG(1, ("Failed to init server credentials\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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status = samba_server_gensec_start(mem_ctx,
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event_ctx, msg_ctx,
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lp_ctx, server_credentials, "cifs",
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&gensec_ctx);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
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TALLOC_FREE(frame);
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return status;
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}
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talloc_reparent(frame, gensec_ctx, msg_ctx);
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talloc_reparent(frame, gensec_ctx, event_ctx);
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talloc_reparent(frame, gensec_ctx, lp_ctx);
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talloc_reparent(frame, gensec_ctx, server_credentials);
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gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
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gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN);
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*gensec_context = gensec_ctx;
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TALLOC_FREE(frame);
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return status;
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}
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/*
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* Hook to allow handling of NTLM authentication for AD operation
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* without directly linking the s4 auth stack
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*
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* This ensures we use the source4 authentication stack, as well as
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* the authorization stack to create the user's token. This ensures
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* consistency between NTLM logins and NTLMSSP logins, as NTLMSSP is
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* handled by the hook above.
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*/
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static NTSTATUS make_auth4_context_s4(const struct auth_context *auth_context,
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TALLOC_CTX *mem_ctx,
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struct auth4_context **auth4_context)
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{
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NTSTATUS status;
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struct loadparm_context *lp_ctx;
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struct tevent_context *event_ctx;
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TALLOC_CTX *frame = talloc_stackframe();
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struct imessaging_context *msg_ctx;
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struct server_id *server_id;
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lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
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if (lp_ctx == NULL) {
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DEBUG(1, ("loadparm_init_s3 failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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event_ctx = s4_event_context_init(frame);
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if (event_ctx == NULL) {
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DEBUG(1, ("s4_event_context_init failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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server_id = new_server_id_task(frame);
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if (server_id == NULL) {
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DEBUG(1, ("new_server_id_task failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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msg_ctx = imessaging_init_discard_incoming(frame,
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lp_ctx,
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*server_id,
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event_ctx);
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if (msg_ctx == NULL) {
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DEBUG(1, ("imessaging_init_discard_incoming failed\n"));
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TALLOC_FREE(frame);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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talloc_reparent(frame, msg_ctx, server_id);
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/* Allow forcing a specific auth4 module */
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if (!auth_context->forced_samba4_methods) {
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status = auth_context_create(mem_ctx,
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event_ctx,
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msg_ctx,
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lp_ctx,
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auth4_context);
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} else {
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const char * const *forced_auth_methods = (const char * const *)str_list_make(mem_ctx, auth_context->forced_samba4_methods, NULL);
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status = auth_context_create_methods(mem_ctx, forced_auth_methods, event_ctx, msg_ctx, lp_ctx, NULL, auth4_context);
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}
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status)));
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TALLOC_FREE(frame);
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return status;
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}
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talloc_reparent(frame, *auth4_context, msg_ctx);
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talloc_reparent(frame, *auth4_context, event_ctx);
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talloc_reparent(frame, *auth4_context, lp_ctx);
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TALLOC_FREE(frame);
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return status;
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}
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/* module initialisation */
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static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
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const char *param,
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struct auth_methods **auth_method)
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{
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struct auth_methods *result;
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gensec_init();
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result = talloc_zero(auth_context, struct auth_methods);
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if (result == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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result->name = "samba4";
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result->auth = check_samba4_security;
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result->prepare_gensec = prepare_gensec;
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result->make_auth4_context = make_auth4_context_s4;
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if (param && *param) {
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auth_context->forced_samba4_methods = talloc_strdup(result, param);
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if (!auth_context->forced_samba4_methods) {
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return NT_STATUS_NO_MEMORY;
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}
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}
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*auth_method = result;
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return NT_STATUS_OK;
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}
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NTSTATUS auth_samba4_init(TALLOC_CTX *mem_ctx);
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NTSTATUS auth_samba4_init(TALLOC_CTX *mem_ctx)
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{
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smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",
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auth_init_samba4);
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return NT_STATUS_OK;
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}
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