1/*
2   Unix SMB/CIFS implementation.
3
4   Winbind client authentication mechanism designed to defer all
5   authentication to the winbind daemon.
6
7   Copyright (C) Tim Potter 2000
8   Copyright (C) Andrew Bartlett 2001 - 2002
9   Copyright (C) Dan Sledz 2009
10
11   This program is free software; you can redistribute it and/or modify
12   it under the terms of the GNU General Public License as published by
13   the Free Software Foundation; either version 3 of the License, or
14   (at your option) any later version.
15
16   This program is distributed in the hope that it will be useful,
17   but WITHOUT ANY WARRANTY; without even the implied warranty of
18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19   GNU General Public License for more details.
20
21   You should have received a copy of the GNU General Public License
22   along with this program.  If not, see <http://www.gnu.org/licenses/>.
23*/
24
25/* This auth module is very similar to auth_winbind with 3 distinct
26 * differences.
27 *
28 *      1) Does not fallback to another auth module if winbindd is unavailable
29 *      2) Does not validate the domain of the user
30 *      3) Handles unencrypted passwords
31 *
32 * The purpose of this module is to defer all authentication decisions (ie:
33 * local user vs NIS vs LDAP vs AD; encrypted vs plaintext) to the wbc
34 * compatible daemon.  This centeralizes all authentication decisions to a
35 * single provider.
36 *
37 * This auth backend is most useful when used in conjunction with pdb_wbc_sam.
38 */
39
40#include "includes.h"
41
42#undef DBGC_CLASS
43#define DBGC_CLASS DBGC_AUTH
44
45/* Authenticate a user with a challenge/response */
46
47static NTSTATUS check_wbc_security(const struct auth_context *auth_context,
48				       void *my_private_data,
49				       TALLOC_CTX *mem_ctx,
50				       const auth_usersupplied_info *user_info,
51				       auth_serversupplied_info **server_info)
52{
53	NTSTATUS nt_status;
54	wbcErr wbc_status;
55	struct wbcAuthUserParams params;
56	struct wbcAuthUserInfo *info = NULL;
57	struct wbcAuthErrorInfo *err = NULL;
58
59	if (!user_info || !auth_context || !server_info) {
60		return NT_STATUS_INVALID_PARAMETER;
61	}
62	/* Send off request */
63
64	params.account_name	= user_info->smb_name;
65	params.domain_name	= user_info->domain;
66	params.workstation_name	= user_info->wksta_name;
67
68	params.flags		= 0;
69	params.parameter_control= user_info->logon_parameters;
70
71	/* Handle plaintext */
72	if (!user_info->encrypted) {
73		DEBUG(3,("Checking plaintext password for %s.\n",
74			 user_info->internal_username));
75		params.level = WBC_AUTH_USER_LEVEL_PLAIN;
76
77		params.password.plaintext = (char *)user_info->plaintext_password.data;
78	} else {
79		DEBUG(3,("Checking encrypted password for %s.\n",
80			 user_info->internal_username));
81		params.level = WBC_AUTH_USER_LEVEL_RESPONSE;
82
83		memcpy(params.password.response.challenge,
84		    auth_context->challenge.data,
85		    sizeof(params.password.response.challenge));
86
87		params.password.response.nt_length = user_info->nt_resp.length;
88		params.password.response.nt_data = user_info->nt_resp.data;
89		params.password.response.lm_length = user_info->lm_resp.length;
90		params.password.response.lm_data = user_info->lm_resp.data;
91
92	}
93
94	/* we are contacting the privileged pipe */
95	become_root();
96	wbc_status = wbcAuthenticateUserEx(&params, &info, &err);
97	unbecome_root();
98
99	if (!WBC_ERROR_IS_OK(wbc_status)) {
100		DEBUG(10,("wbcAuthenticateUserEx failed (%d): %s\n",
101			wbc_status, wbcErrorString(wbc_status)));
102	}
103
104	if (wbc_status == WBC_ERR_NO_MEMORY) {
105		return NT_STATUS_NO_MEMORY;
106	}
107
108	if (wbc_status == WBC_ERR_AUTH_ERROR) {
109		nt_status = NT_STATUS(err->nt_status);
110		wbcFreeMemory(err);
111		return nt_status;
112	}
113
114	if (!WBC_ERROR_IS_OK(wbc_status)) {
115		return NT_STATUS_LOGON_FAILURE;
116	}
117
118	DEBUG(10,("wbcAuthenticateUserEx succeeded\n"));
119
120	nt_status = make_server_info_wbcAuthUserInfo(mem_ctx,
121						     user_info->smb_name,
122						     user_info->domain,
123						     info, server_info);
124	wbcFreeMemory(info);
125	if (!NT_STATUS_IS_OK(nt_status)) {
126		return nt_status;
127	}
128
129	(*server_info)->nss_token |= user_info->was_mapped;
130
131        return nt_status;
132}
133
134/* module initialisation */
135static NTSTATUS auth_init_wbc(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
136{
137	if (!make_auth_methods(auth_context, auth_method)) {
138		return NT_STATUS_NO_MEMORY;
139	}
140
141	(*auth_method)->name = "wbc";
142	(*auth_method)->auth = check_wbc_security;
143
144	return NT_STATUS_OK;
145}
146
147NTSTATUS auth_wbc_init(void)
148{
149	return smb_register_auth(AUTH_INTERFACE_VERSION, "wbc", auth_init_wbc);
150}
151