summaryrefslogtreecommitdiff
path: root/source3/auth/auth_server.c
blob: b279152f7482525dfb3eec82049e2acebd3e53b9 (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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Authenticate to a remote server
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Andrew Bartlett 2001

   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern int DEBUGLEVEL;

extern pstring global_myname;

/****************************************************************************
 Return the client state structure.
****************************************************************************/

struct cli_state *server_client(void)
{
	static struct cli_state pw_cli;
	return &pw_cli;
}

/****************************************************************************
 Support for server level security.
****************************************************************************/

struct cli_state *server_cryptkey(void)
{
	struct cli_state *cli;
	fstring desthost;
	struct in_addr dest_ip;
	char *p, *pserver;
	BOOL connected_ok = False;

	cli = server_client();

	if (!cli_initialise(cli))
		return NULL;

        pserver = strdup(lp_passwordserver());
	p = pserver;

        while(next_token( &p, desthost, LIST_SEP, sizeof(desthost))) {
		standard_sub_basic(desthost);
		strupper(desthost);

		if(!resolve_name( desthost, &dest_ip, 0x20)) {
			DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost));
			continue;
		}

		if (ismyip(dest_ip)) {
			DEBUG(1,("Password server loop - disabling password server %s\n",desthost));
			continue;
		}

		if (cli_connect(cli, desthost, &dest_ip)) {
			DEBUG(3,("connected to password server %s\n",desthost));
			connected_ok = True;
			break;
		}
	}

	free(pserver);

	if (!connected_ok) {
		DEBUG(0,("password server not available\n"));
		cli_shutdown(cli);
		return NULL;
	}

	if (!attempt_netbios_session_request(cli, global_myname, desthost, &dest_ip))
		return NULL;

	DEBUG(3,("got session\n"));

	if (!cli_negprot(cli)) {
		DEBUG(1,("%s rejected the negprot\n",desthost));
		cli_shutdown(cli);
		return NULL;
	}

	if (cli->protocol < PROTOCOL_LANMAN2 ||
	    !(cli->sec_mode & 1)) {
		DEBUG(1,("%s isn't in user level security mode\n",desthost));
		cli_shutdown(cli);
		return NULL;
	}

	DEBUG(3,("password server OK\n"));

	return cli;
}


/****************************************************************************
 Validate a password with the password server.
****************************************************************************/

static NTSTATUS server_validate(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info)
{
	struct cli_state *cli;
	static unsigned char badpass[24];
	static fstring baduser; 
	static BOOL tested_password_server = False;
	static BOOL bad_password_server = False;
	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;

	cli = server_client();

	if (!cli->initialised) {
		DEBUG(1,("password server %s is not connected\n", cli->desthost));
		return(NT_STATUS_LOGON_FAILURE);
	}  

	if(badpass[0] == 0)
		memset(badpass, 0x1f, sizeof(badpass));

	if((user_info->nt_resp.len == sizeof(badpass)) && 
	   !memcmp(badpass, user_info->nt_resp.buffer, sizeof(badpass))) {
		/* 
		 * Very unlikely, our random bad password is the same as the users
		 * password.
		 */
		memset(badpass, badpass[0]+1, sizeof(badpass));
	}

	if(baduser[0] == 0) {
		fstrcpy(baduser, INVALID_USER_PREFIX);
		fstrcat(baduser, global_myname);
	}

	/*
	 * Attempt a session setup with a totally incorrect password.
	 * If this succeeds with the guest bit *NOT* set then the password
	 * server is broken and is not correctly setting the guest bit. We
	 * need to detect this as some versions of NT4.x are broken. JRA.
	 */

	/* I sure as hell hope that there arn't servers out there that take 
	 * NTLMv2 and have this bug, as we don't test for that... 
	 *  - abartlet@samba.org
	 */

	if ((!tested_password_server) && (lp_paranoid_server_security())) {
		if (cli_session_setup(cli, baduser, (char *)badpass, sizeof(badpass), 
					(char *)badpass, sizeof(badpass), user_info->domain.str)) {

			/*
			 * We connected to the password server so we
			 * can say we've tested it.
			 */
			tested_password_server = True;

			if ((SVAL(cli->inbuf,smb_vwv2) & 1) == 0) {
				DEBUG(0,("server_validate: password server %s allows users as non-guest \
with a bad password.\n", cli->desthost));
				DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \
use this machine as the password server.\n"));
				cli_ulogoff(cli);

				/*
				 * Password server has the bug.
				 */
				bad_password_server = True;
				return NT_STATUS_LOGON_FAILURE;
			}
			cli_ulogoff(cli);
		}
	} else {

		/*
		 * We have already tested the password server.
		 * Fail immediately if it has the bug.
		 */

		if(bad_password_server) {
			DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \
with a bad password.\n", cli->desthost));
			DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \
use this machine as the password server.\n"));
			return NT_STATUS_LOGON_FAILURE;
		}
	}

	/*
	 * Now we know the password server will correctly set the guest bit, or is
	 * not guest enabled, we can try with the real password.
	 */

	if (!cli_session_setup(cli, user_info->smb_username.str, 
			       (char *)user_info->lm_resp.buffer, 
			       user_info->lm_resp.len, 
			       (char *)user_info->nt_resp.buffer, 
			       user_info->nt_resp.len, 
			       user_info->domain.str)) {
		DEBUG(1,("password server %s rejected the password\n", cli->desthost));
		/* Make this cli_nt_error() when the conversion is in */
		nt_status = NT_STATUS_LOGON_FAILURE;
	} else {
		nt_status = NT_STATUS_OK;
	}

	/* if logged in as guest then reject */
	if ((SVAL(cli->inbuf,smb_vwv2) & 1) != 0) {
		DEBUG(1,("password server %s gave us guest only\n", cli->desthost));
		nt_status = NT_STATUS_LOGON_FAILURE;
	}

	cli_ulogoff(cli);

	return(nt_status);
}

/****************************************************************************
 Check for a valid username and password in security=server mode.
****************************************************************************/

NTSTATUS check_server_security(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info)
{
	
	if(lp_security() != SEC_SERVER)
		return NT_STATUS_LOGON_FAILURE;
	
	return server_validate(user_info, server_info);
}