1/*
2   Unix SMB/CIFS implementation.
3   Password and authentication handling
4   Copyright (C) Andrew Bartlett              2001
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program.  If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "includes.h"
21
22#undef DBGC_CLASS
23#define DBGC_CLASS DBGC_AUTH
24
25/**
26 * update the encrypted smbpasswd file from the plaintext username and password
27 *
28 *  this ugly hack needs to die, but not quite yet, I think people still use it...
29 **/
30static bool update_smbpassword_file(const char *user, const char *password)
31{
32	struct samu 	*sampass;
33	bool            ret;
34
35	if ( !(sampass = samu_new( NULL )) ) {
36		return False;
37	}
38
39	become_root();
40	ret = pdb_getsampwnam(sampass, user);
41	unbecome_root();
42
43	if(ret == False) {
44		DEBUG(0,("pdb_getsampwnam returned NULL\n"));
45		TALLOC_FREE(sampass);
46		return False;
47	}
48
49	/*
50	 * Remove the account disabled flag - we are updating the
51	 * users password from a login.
52	 */
53	if (!pdb_set_acct_ctrl(sampass, pdb_get_acct_ctrl(sampass) & ~ACB_DISABLED, PDB_CHANGED)) {
54		TALLOC_FREE(sampass);
55		return False;
56	}
57
58	if (!pdb_set_plaintext_passwd (sampass, password)) {
59		TALLOC_FREE(sampass);
60		return False;
61	}
62
63	/* Now write it into the file. */
64	become_root();
65
66	ret = NT_STATUS_IS_OK(pdb_update_sam_account (sampass));
67
68	unbecome_root();
69
70	if (ret) {
71		DEBUG(3,("pdb_update_sam_account returned %d\n",ret));
72	}
73
74	TALLOC_FREE(sampass);
75	return ret;
76}
77
78
79/** Check a plaintext username/password
80 *
81 * Cannot deal with an encrupted password in any manner whatsoever,
82 * unless the account has a null password.
83 **/
84
85static NTSTATUS check_unix_security(const struct auth_context *auth_context,
86			     void *my_private_data,
87			     TALLOC_CTX *mem_ctx,
88			     const auth_usersupplied_info *user_info,
89			     auth_serversupplied_info **server_info)
90{
91	NTSTATUS nt_status;
92	struct passwd *pass = NULL;
93
94	become_root();
95	pass = Get_Pwnam_alloc(talloc_tos(), user_info->internal_username);
96
97
98	/** @todo This call assumes a ASCII password, no charset transformation is
99	    done.  We may need to revisit this **/
100	nt_status = pass_check(pass,
101				pass ? pass->pw_name : user_info->internal_username,
102				(char *)user_info->plaintext_password.data,
103				user_info->plaintext_password.length-1,
104				lp_update_encrypted() ?
105				update_smbpassword_file : NULL,
106				True);
107
108	unbecome_root();
109
110	if (NT_STATUS_IS_OK(nt_status)) {
111		if (pass) {
112			/* if a real user check pam account restrictions */
113			/* only really perfomed if "obey pam restriction" is true */
114			nt_status = smb_pam_accountcheck(pass->pw_name);
115			if (  !NT_STATUS_IS_OK(nt_status)) {
116				DEBUG(1, ("PAM account restriction prevents user login\n"));
117			} else {
118				make_server_info_pw(server_info, pass->pw_name, pass);
119			}
120		} else {
121			/* we need to do somthing more useful here */
122			nt_status = NT_STATUS_NO_SUCH_USER;
123		}
124	}
125
126	TALLOC_FREE(pass);
127	return nt_status;
128}
129
130/* module initialisation */
131static NTSTATUS auth_init_unix(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
132{
133	if (!make_auth_methods(auth_context, auth_method)) {
134		return NT_STATUS_NO_MEMORY;
135	}
136
137	(*auth_method)->name = "unix";
138	(*auth_method)->auth = check_unix_security;
139	return NT_STATUS_OK;
140}
141
142NTSTATUS auth_unix_init(void)
143{
144	return smb_register_auth(AUTH_INTERFACE_VERSION, "unix", auth_init_unix);
145}
146