summaryrefslogtreecommitdiff
path: root/source3/smbd/auth.c
blob: c62e2ed5a07ca7d7c4d707f4b03a6d1bccfee2da (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
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Password and authentication handling
   Copyright (C) Andrew Tridgell              1992-2000
   Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   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"

/****************************************************************************
 Check user is in correct domain if required
****************************************************************************/

static BOOL check_domain_match(char *user, char *domain) 
{
  /*
   * If we aren't serving to trusted domains, we must make sure that
   * the validation request comes from an account in the same domain
   * as the Samba server
   */

  if (!lp_allow_trusted_domains() &&
      (!strequal(lp_workgroup(), domain) || strequal("", domain))) {
      DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
      return False;
  } else {
      return True;
  }
}

/****************************************************************************
 Check a users password, as given in the user-info struct and return various
 interesting details in the server_info struct.

 This functions does NOT need to be in a become_root()/unbecome_root() pair
 as it makes the calls itself when needed.

 The return value takes precedence over the contents of the server_info 
 struct.  When the return is other than NT_STATUS_NOPROBLEMO the contents 
 of that structure is undefined.

****************************************************************************/

NTSTATUS check_password(const auth_usersupplied_info *user_info, 
			const auth_authsupplied_info *auth_info,
			auth_serversupplied_info **server_info)
{
	
	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
	const char *pdb_username;
	auth_methods *auth_method;

	if (!user_info || !auth_info || !server_info) {
		return NT_STATUS_LOGON_FAILURE;
	}

	DEBUG(3, ("check_password:  Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n", 
		  user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));

	DEBUG(3, ("check_password:  mapped user is: [%s]\\[%s]@[%s]\n", 
		  user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
	DEBUG(10, ("auth_info challange created by %s\n", auth_info->challange_set_by));
	DEBUG(10, ("challange is: \n"));
	dump_data(5, (auth_info)->challange.data, (auth_info)->challange.length);

#ifdef DEBUG_PASSWORD
	DEBUG(100, ("user_info has passwords of length %d and %d\n", 
		    user_info->lm_resp.length, user_info->nt_resp.length));
	DEBUG(100, ("lm:\n"));
	dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
	DEBUG(100, ("nt:\n"));
	dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
#endif

	for (auth_method = auth_info->auth_method_list;auth_method; auth_method = auth_method->next)
	{
		nt_status = auth_method->auth(auth_method->private_data, user_info, auth_info, server_info);
		if (NT_STATUS_IS_OK(nt_status)) {
			DEBUG(3, ("check_password: %s authentication for user [%s] suceeded\n", 
				  auth_method->name, user_info->smb_name.str));
		} else {
			DEBUG(5, ("check_password: %s authentication for user [%s] FAILED with error %s\n", 
				  auth_method->name, user_info->smb_name.str, get_nt_error_msg(nt_status)));
		}
		
		if (NT_STATUS_IS_OK(nt_status)) {
			break;
		}
	}

	/* This needs to be sorted:  If it doesn't match, what should we do? */
  	if (!check_domain_match(user_info->smb_name.str, user_info->domain.str)) {
		return NT_STATUS_LOGON_FAILURE;
	}


	/* This is one of the few places the *relies* (rather than just sets defaults
	   on the value of lp_security().  This needs to change.  A new paramater 
	   perhaps? */
	if (lp_security() >= SEC_SERVER) {
		smb_user_control(user_info, *server_info, nt_status);
	}

	if (NT_STATUS_IS_OK(nt_status)) {
		pdb_username = pdb_get_username((*server_info)->sam_account);
		if (!(*server_info)->guest) {
			/* We might not be root if we are an RPC call */
			become_root();
			nt_status = smb_pam_accountcheck(pdb_username);
			unbecome_root();
			
			if (NT_STATUS_IS_OK(nt_status)) {
				DEBUG(5, ("check_password:  PAM Account for user [%s] suceeded\n", 
					  pdb_username));
			} else {
				DEBUG(3, ("check_password:  PAM Account for user [%s] FAILED with error %s\n", 
					  pdb_username, get_nt_error_msg(nt_status)));
			} 
		}
		
		if (NT_STATUS_IS_OK(nt_status)) {
			DEBUG((*server_info)->guest ? 5 : 2, 
			      ("check_password:  %sauthenticaion for user [%s] -> [%s] -> [%s] suceeded\n", 
			       (*server_info)->guest ? "guest " : "", 
			       user_info->smb_name.str, 
			       user_info->internal_username.str, 
			       pdb_username));
		}
	}

	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(2, ("check_password:  Authenticaion for user [%s] -> [%s] FAILED with error %s\n", 
			  user_info->smb_name.str, user_info->internal_username.str, 
			  get_nt_error_msg(nt_status)));
		ZERO_STRUCTP(server_info);
	}
	return nt_status;

}

/****************************************************************************
 Squash an NT_STATUS return in line with requirements for unauthenticated 
 connections.  (session setups in particular)
****************************************************************************/

NTSTATUS nt_status_squash(NTSTATUS nt_status) 
{
	if NT_STATUS_IS_OK(nt_status) {
		return nt_status;		
	} else if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
		/* Match WinXP and don't give the game away */
		return NT_STATUS_LOGON_FAILURE;
		
	} else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
		/* Match WinXP and don't give the game away */
		return NT_STATUS_LOGON_FAILURE;
	} else {
		return nt_status;
	}  
}



/****************************************************************************
 COMPATABILITY INTERFACES:
 ***************************************************************************/

/****************************************************************************
check if a username/password is OK assuming the password is a 24 byte
SMB hash
return True if the password is correct, False otherwise
****************************************************************************/

static NTSTATUS pass_check_smb(char *smb_name,
			       char *domain, 
			       DATA_BLOB lm_pwd,
			       DATA_BLOB nt_pwd,
			       DATA_BLOB plaintext_password,
			       BOOL encrypted)

{
	NTSTATUS nt_status;
	auth_usersupplied_info *user_info = NULL;
	extern auth_authsupplied_info *negprot_global_auth_info;
	auth_serversupplied_info *server_info = NULL;
	if (encrypted) {		
		make_user_info_for_reply_enc(&user_info, smb_name, 
					     domain,
					     lm_pwd, 
					     nt_pwd, 
					     plaintext_password);
		nt_status = check_password(user_info, negprot_global_auth_info, &server_info);
	} else {
		auth_authsupplied_info *plaintext_auth_info = NULL;
		DATA_BLOB chal;
		if (!make_auth_info_subsystem(&plaintext_auth_info)) {
			return NT_STATUS_NO_MEMORY;
		}

		chal = auth_get_challange(plaintext_auth_info);

		if (!make_user_info_for_reply(&user_info, 
					      smb_name, domain, chal.data,
					      plaintext_password)) {
			return NT_STATUS_NO_MEMORY;
		}
		
		nt_status = check_password(user_info, plaintext_auth_info, &server_info); 
		
		data_blob_free(&chal);
		free_auth_info(&plaintext_auth_info);
	}		
	free_user_info(&user_info);
	free_server_info(&server_info);
	return nt_status;
}

/****************************************************************************
check if a username/password pair is OK either via the system password
database or the encrypted SMB password database
return True if the password is correct, False otherwise
****************************************************************************/
BOOL password_ok(char *smb_name, DATA_BLOB password_blob)
{

	DATA_BLOB null_password = data_blob(NULL, 0);
	extern BOOL global_encrypted_passwords_negotiated;
	BOOL encrypted = (global_encrypted_passwords_negotiated && password_blob.length == 24);
	
	if (encrypted) {
		/* 
		 * The password could be either NTLM or plain LM.  Try NTLM first, 
		 * but fall-through as required.
		 * NTLMv2 makes no sense here.
		 */
		if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), null_password, password_blob, null_password, encrypted))) {
			return True;
		}
		
		if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), password_blob, null_password, null_password, encrypted))) {
			return True;
		}
	} else {
		if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), null_password, null_password, password_blob, encrypted))) {
			return True;
		}
	}

	return False;
}