summaryrefslogtreecommitdiff
path: root/source3/auth/auth_samba4.c
blob: 994bde1713289119fe91dbc4583fea570d731f54 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/*
   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 "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"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH

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 **server_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;
	struct loadparm_context *lp_ctx;

	lp_ctx = loadparm_init_s3(frame, loadparm_s3_context());
	if (lp_ctx == NULL) {
		DEBUG(10, ("loadparm_init_s3 failed\n"));
		talloc_free(frame);
		return NT_STATUS_INVALID_SERVER_STATE;
	}

	/* We create a private tevent context here to avoid nested loops in
	 * the s3 one, as that may not be expected */
	nt_status = auth_context_create(mem_ctx,
					s4_event_context_init(frame), NULL, 
					lp_ctx,
					&auth4_context);
	NT_STATUS_NOT_OK_RETURN(nt_status);
		
	nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4");
	NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);

	nt_status = auth_check_password(auth4_context, auth4_context, user_info, &user_info_dc);
	NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, auth4_context);
	
	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;
	}

	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)));
		TALLOC_FREE(frame);
		return nt_status;
	}

	nt_status = NT_STATUS_OK;

 done:
	TALLOC_FREE(frame);
	return nt_status;
}

/* Hook to allow GENSEC to handle blob-based authentication
 * mechanisms, without directly linking the mechansim code */
static NTSTATUS prepare_gensec(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;

	lp_ctx = loadparm_init_s3(frame, loadparm_s3_context());
	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(mem_ctx);
	if (event_ctx == NULL) {
		DEBUG(1, ("s4_event_context_init failed\n"));
		TALLOC_FREE(frame);
		return NT_STATUS_INVALID_SERVER_STATE;
	}

	msg_ctx = imessaging_client_init(frame,
					 lpcfg_imessaging_path(frame, lp_ctx),
					 event_ctx);
	if (msg_ctx == NULL) {
		DEBUG(1, ("imessaging_init failed\n"));
		TALLOC_FREE(frame);
		return NT_STATUS_INVALID_SERVER_STATE;
	}

	server_credentials
		= cli_credentials_init(frame);
	if (!server_credentials) {
		DEBUG(1, ("Failed to init server credentials"));
		TALLOC_FREE(frame);
		return NT_STATUS_INVALID_SERVER_STATE;
	}

	cli_credentials_set_conf(server_credentials, lp_ctx);
	status = cli_credentials_set_machine_account(server_credentials, lp_ctx);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(status)));
		talloc_free(server_credentials);
		server_credentials = NULL;
	}

	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;
}

/* module initialisation */
static NTSTATUS auth_init_samba4(struct auth_context *auth_context,
				    const char *param,
				    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->gensec_start_mech_by_oid = gensec_start_mech_by_oid;
	result->gensec_start_mech_by_authtype = gensec_start_mech_by_authtype;

        *auth_method = result;
	return NT_STATUS_OK;
}

NTSTATUS auth_samba4_init(void)
{
	smb_register_auth(AUTH_INTERFACE_VERSION, "samba4",
			  auth_init_samba4);
	return NT_STATUS_OK;
}