1/*
2   Unix SMB/CIFS implementation.
3   Generic authentication types
4   Copyright (C) Andrew Bartlett         2001-2002
5   Copyright (C) Jelmer Vernooij              2002
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22
23#undef DBGC_CLASS
24#define DBGC_CLASS DBGC_AUTH
25
26/**
27 * Return a guest logon for guest users (username = "")
28 *
29 * Typically used as the first module in the auth chain, this allows
30 * guest logons to be dealt with in one place.  Non-guest logons 'fail'
31 * and pass onto the next module.
32 **/
33
34static NTSTATUS check_guest_security(const struct auth_context *auth_context,
35				     void *my_private_data,
36				     TALLOC_CTX *mem_ctx,
37				     const auth_usersupplied_info *user_info,
38				     auth_serversupplied_info **server_info)
39{
40	/* mark this as 'not for me' */
41	NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
42
43	if (!(user_info->internal_username
44	      && *user_info->internal_username)) {
45		nt_status = make_server_info_guest(NULL, server_info);
46	}
47
48	return nt_status;
49}
50
51/* Guest modules initialisation */
52
53static NTSTATUS auth_init_guest(struct auth_context *auth_context, const char *options, auth_methods **auth_method)
54{
55	if (!make_auth_methods(auth_context, auth_method))
56		return NT_STATUS_NO_MEMORY;
57
58	(*auth_method)->auth = check_guest_security;
59	(*auth_method)->name = "guest";
60	return NT_STATUS_OK;
61}
62
63#ifdef DEVELOPER
64/**
65 * Return an error based on username
66 *
67 * This function allows the testing of obsure errors, as well as the generation
68 * of NT_STATUS -> DOS error mapping tables.
69 *
70 * This module is of no value to end-users.
71 *
72 * The password is ignored.
73 *
74 * @return An NTSTATUS value based on the username
75 **/
76
77static NTSTATUS check_name_to_ntstatus_security(const struct auth_context *auth_context,
78						void *my_private_data,
79						TALLOC_CTX *mem_ctx,
80						const auth_usersupplied_info *user_info,
81						auth_serversupplied_info **server_info)
82{
83	NTSTATUS nt_status;
84	fstring user;
85	long error_num;
86	fstrcpy(user, user_info->smb_name);
87
88	if (strnequal("NT_STATUS", user, strlen("NT_STATUS"))) {
89		strupper_m(user);
90		return nt_status_string_to_code(user);
91	}
92
93	strlower_m(user);
94	error_num = strtoul(user, NULL, 16);
95
96	DEBUG(5,("check_name_to_ntstatus_security: Error for user %s was %lx\n", user, error_num));
97
98	nt_status = NT_STATUS(error_num);
99
100	return nt_status;
101}
102
103/** Module initialisation function */
104
105static NTSTATUS auth_init_name_to_ntstatus(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
106{
107	if (!make_auth_methods(auth_context, auth_method))
108		return NT_STATUS_NO_MEMORY;
109
110	(*auth_method)->auth = check_name_to_ntstatus_security;
111	(*auth_method)->name = "name_to_ntstatus";
112	return NT_STATUS_OK;
113}
114
115/**
116 * Return a 'fixed' challenge instead of a variable one.
117 *
118 * The idea of this function is to make packet snifs consistant
119 * with a fixed challenge, so as to aid debugging.
120 *
121 * This module is of no value to end-users.
122 *
123 * This module does not actually authenticate the user, but
124 * just pretenteds to need a specified challenge.
125 * This module removes *all* security from the challenge-response system
126 *
127 * @return NT_STATUS_UNSUCCESSFUL
128 **/
129
130static NTSTATUS check_fixed_challenge_security(const struct auth_context *auth_context,
131					       void *my_private_data,
132					       TALLOC_CTX *mem_ctx,
133					       const auth_usersupplied_info *user_info,
134					       auth_serversupplied_info **server_info)
135{
136	return NT_STATUS_NOT_IMPLEMENTED;
137}
138
139/****************************************************************************
140 Get the challenge out of a password server.
141****************************************************************************/
142
143static DATA_BLOB auth_get_fixed_challenge(const struct auth_context *auth_context,
144					  void **my_private_data,
145					  TALLOC_CTX *mem_ctx)
146{
147	const char *challenge = "I am a teapot";
148	return data_blob(challenge, 8);
149}
150
151
152/** Module initailisation function */
153
154static NTSTATUS auth_init_fixed_challenge(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
155{
156	if (!make_auth_methods(auth_context, auth_method))
157		return NT_STATUS_NO_MEMORY;
158
159	(*auth_method)->auth = check_fixed_challenge_security;
160	(*auth_method)->get_chal = auth_get_fixed_challenge;
161	(*auth_method)->name = "fixed_challenge";
162	return NT_STATUS_OK;
163}
164#endif /* DEVELOPER */
165
166NTSTATUS auth_builtin_init(void)
167{
168	smb_register_auth(AUTH_INTERFACE_VERSION, "guest", auth_init_guest);
169#ifdef DEVELOPER
170	smb_register_auth(AUTH_INTERFACE_VERSION, "fixed_challenge", auth_init_fixed_challenge);
171	smb_register_auth(AUTH_INTERFACE_VERSION, "name_to_ntstatus", auth_init_name_to_ntstatus);
172#endif
173	return NT_STATUS_OK;
174}
175