Replace cli_rpc_pipe_close by a talloc destructor on rpc_pipe_struct
[kai/samba.git] / source / libsmb / passchange.c
1 /* 
2    Unix SMB/CIFS implementation.
3    SMB client password change routine
4    Copyright (C) Andrew Tridgell 1994-1998
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 /*************************************************************
23  Change a password on a remote machine using IPC calls.
24 *************************************************************/
25
26 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name, 
27                                 const char *old_passwd, const char *new_passwd,
28                                 char **err_str)
29 {
30         struct nmb_name calling, called;
31         struct cli_state *cli;
32         struct rpc_pipe_client *pipe_hnd;
33         struct sockaddr_storage ss;
34
35         NTSTATUS result;
36         bool pass_must_change = False;
37
38         *err_str = NULL;
39
40         if(!resolve_name( remote_machine, &ss, 0x20)) {
41                 asprintf(err_str, "Unable to find an IP address for machine "
42                          "%s.\n", remote_machine);
43                 return NT_STATUS_UNSUCCESSFUL;
44         }
45  
46         cli = cli_initialise();
47         if (!cli) {
48                 return NT_STATUS_NO_MEMORY;
49         }
50
51         result = cli_connect(cli, remote_machine, &ss);
52         if (!NT_STATUS_IS_OK(result)) {
53                 asprintf(err_str, "Unable to connect to SMB server on "
54                          "machine %s. Error was : %s.\n",
55                          remote_machine, nt_errstr(result));
56                 cli_shutdown(cli);
57                 return result;
58         }
59   
60         make_nmb_name(&calling, global_myname() , 0x0);
61         make_nmb_name(&called , remote_machine, 0x20);
62         
63         if (!cli_session_request(cli, &calling, &called)) {
64                 asprintf(err_str, "machine %s rejected the session setup. "
65                          "Error was : %s.\n",
66                          remote_machine, cli_errstr(cli) );
67                 result = cli_nt_error(cli);
68                 cli_shutdown(cli);
69                 return result;
70         }
71   
72         cli->protocol = PROTOCOL_NT1;
73
74         if (!cli_negprot(cli)) {
75                 asprintf(err_str, "machine %s rejected the negotiate "
76                          "protocol. Error was : %s.\n",        
77                          remote_machine, cli_errstr(cli) );
78                 result = cli_nt_error(cli);
79                 cli_shutdown(cli);
80                 return result;
81         }
82   
83         /* Given things like SMB signing, restrict anonymous and the like, 
84            try an authenticated connection first */
85         result = cli_session_setup(cli, user_name,
86                                    old_passwd, strlen(old_passwd)+1,
87                                    old_passwd, strlen(old_passwd)+1, "");
88
89         if (!NT_STATUS_IS_OK(result)) {
90
91                 /* Password must change or Password expired are the only valid
92                  * error conditions here from where we can proceed, the rest like
93                  * account locked out or logon failure will lead to errors later
94                  * anyway */
95
96                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
97                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
98                         asprintf(err_str, "Could not connect to machine %s: "
99                                  "%s\n", remote_machine, cli_errstr(cli));
100                         cli_shutdown(cli);
101                         return result;
102                 }
103
104                 pass_must_change = True;
105
106                 /*
107                  * We should connect as the anonymous user here, in case
108                  * the server has "must change password" checked...
109                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
110                  */
111
112                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
113
114                 if (!NT_STATUS_IS_OK(result)) {
115                         asprintf(err_str, "machine %s rejected the session "
116                                  "setup. Error was : %s.\n",        
117                                  remote_machine, cli_errstr(cli) );
118                         cli_shutdown(cli);
119                         return result;
120                 }
121
122                 cli_init_creds(cli, "", "", NULL);
123         } else {
124                 cli_init_creds(cli, user_name, "", old_passwd);
125         }
126
127         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
128                 asprintf(err_str, "machine %s rejected the tconX on the IPC$ "
129                          "share. Error was : %s.\n",
130                          remote_machine, cli_errstr(cli) );
131                 result = cli_nt_error(cli);
132                 cli_shutdown(cli);
133                 return result;
134         }
135
136         /* Try not to give the password away too easily */
137
138         if (!pass_must_change) {
139                 pipe_hnd = cli_rpc_pipe_open_ntlmssp(cli,
140                                                 PI_SAMR,
141                                                 PIPE_AUTH_LEVEL_PRIVACY,
142                                                 "", /* what domain... ? */
143                                                 user_name,
144                                                 old_passwd,
145                                                 &result);
146         } else {
147                 /*
148                  * If the user password must be changed the ntlmssp bind will
149                  * fail the same way as the session setup above did. The
150                  * difference ist that with a pipe bind we don't get a good
151                  * error message, the result will be that the rpc call below
152                  * will just fail. So we do it anonymously, there's no other
153                  * way.
154                  */
155                 pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
156         }
157
158         if (!pipe_hnd) {
159                 if (lp_client_lanman_auth()) {
160                         /* Use the old RAP method. */
161                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
162                                 asprintf(err_str, "machine %s rejected the "
163                                          "password change: Error was : %s.\n",
164                                          remote_machine, cli_errstr(cli) );
165                                 result = cli_nt_error(cli);
166                                 cli_shutdown(cli);
167                                 return result;
168                         }
169                 } else {
170                         asprintf(err_str, "SAMR connection to machine %s "
171                                  "failed. Error was %s, but LANMAN password "
172                                  "changed are disabled\n",
173                                  nt_errstr(result), remote_machine);
174                         result = cli_nt_error(cli);
175                         cli_shutdown(cli);
176                         return result;
177                 }
178         }
179
180         result = rpccli_samr_chgpasswd_user(pipe_hnd, talloc_tos(),
181                                             user_name, new_passwd, old_passwd);
182         if (NT_STATUS_IS_OK(result)) {
183                 /* Great - it all worked! */
184                 cli_shutdown(cli);
185                 return NT_STATUS_OK;
186
187         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) 
188                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
189                 /* it failed, but for reasons such as wrong password, too short etc ... */
190                 
191                 asprintf(err_str, "machine %s rejected the password change: "
192                          "Error was : %s.\n",
193                          remote_machine, get_friendly_nt_error_msg(result));
194                 cli_shutdown(cli);
195                 return result;
196         }
197
198         /* OK, that failed, so try again... */
199         TALLOC_FREE(pipe_hnd);
200         
201         /* Try anonymous NTLMSSP... */
202         cli_init_creds(cli, "", "", NULL);
203         
204         result = NT_STATUS_UNSUCCESSFUL;
205         
206         /* OK, this is ugly, but... try an anonymous pipe. */
207         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
208
209         if ( pipe_hnd &&
210                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(
211                                          pipe_hnd, talloc_tos(), user_name,
212                                          new_passwd, old_passwd)))) {
213                 /* Great - it all worked! */
214                 cli_shutdown(cli);
215                 return NT_STATUS_OK;
216         } else {
217                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) 
218                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
219                         /* it failed, but again it was due to things like new password too short */
220
221                         asprintf(err_str, "machine %s rejected the "
222                                  "(anonymous) password change: Error was : "
223                                  "%s.\n", remote_machine,
224                                  get_friendly_nt_error_msg(result));
225                         cli_shutdown(cli);
226                         return result;
227                 }
228                 
229                 /* We have failed to change the user's password, and we think the server
230                    just might not support SAMR password changes, so fall back */
231                 
232                 if (lp_client_lanman_auth()) {
233                         /* Use the old RAP method. */
234                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
235                                 /* SAMR failed, but the old LanMan protocol worked! */
236
237                                 cli_shutdown(cli);
238                                 return NT_STATUS_OK;
239                         }
240                         asprintf(err_str, "machine %s rejected the password "
241                                  "change: Error was : %s.\n",
242                                  remote_machine, cli_errstr(cli) );
243                         result = cli_nt_error(cli);
244                         cli_shutdown(cli);
245                         return result;
246                 } else {
247                         asprintf(err_str, "SAMR connection to machine %s "
248                                  "failed. Error was %s, but LANMAN password "
249                                  "changed are disabled\n",
250                                 nt_errstr(result), remote_machine);
251                         cli_shutdown(cli);
252                         return NT_STATUS_UNSUCCESSFUL;
253                 }
254         }
255 }