s3-libsmb/passchange.c: remove some cli_nt_error() calls
[gd/samba-autobuild/.git] / source3 / 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 #include "../librpc/gen_ndr/ndr_samr.h"
22 #include "rpc_client/cli_pipe.h"
23 #include "rpc_client/cli_samr.h"
24 #include "libsmb/libsmb.h"
25 #include "libsmb/clirap.h"
26 #include "libsmb/nmblib.h"
27
28 /*************************************************************
29  Change a password on a remote machine using IPC calls.
30 *************************************************************/
31
32 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name, 
33                                 const char *old_passwd, const char *new_passwd,
34                                 char **err_str)
35 {
36         struct cli_state *cli = NULL;
37         struct rpc_pipe_client *pipe_hnd = NULL;
38         char *user, *domain, *p;
39
40         NTSTATUS result;
41         bool pass_must_change = False;
42
43         user = talloc_strdup(talloc_tos(), user_name);
44         SMB_ASSERT(user != NULL);
45         domain = talloc_strdup(talloc_tos(), "");
46         SMB_ASSERT(domain != NULL);
47
48         /* allow usernames of the form domain\\user or domain/user */
49         if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
50             (p = strchr_m(user,*lp_winbind_separator()))) {
51                 *p = 0;
52                 domain = user;
53                 user = p+1;
54         }
55
56         *err_str = NULL;
57
58         result = cli_connect_nb(remote_machine, NULL, 0, 0x20, NULL,
59                                 SMB_SIGNING_DEFAULT, 0, &cli);
60         if (!NT_STATUS_IS_OK(result)) {
61                 if (asprintf(err_str, "Unable to connect to SMB server on "
62                          "machine %s. Error was : %s.\n",
63                          remote_machine, nt_errstr(result))==-1) {
64                         *err_str = NULL;
65                 }
66                 return result;
67         }
68
69         result = cli_negprot(cli, PROTOCOL_NT1);
70
71         if (!NT_STATUS_IS_OK(result)) {
72                 if (asprintf(err_str, "machine %s rejected the negotiate "
73                          "protocol. Error was : %s.\n",        
74                          remote_machine, nt_errstr(result)) == -1) {
75                         *err_str = NULL;
76                 }
77                 cli_shutdown(cli);
78                 return result;
79         }
80
81         /* Given things like SMB signing, restrict anonymous and the like, 
82            try an authenticated connection first */
83         result = cli_session_setup(cli, user_name,
84                                    old_passwd, strlen(old_passwd)+1,
85                                    old_passwd, strlen(old_passwd)+1, "");
86
87         if (!NT_STATUS_IS_OK(result)) {
88
89                 /* Password must change or Password expired are the only valid
90                  * error conditions here from where we can proceed, the rest like
91                  * account locked out or logon failure will lead to errors later
92                  * anyway */
93
94                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
95                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
96                         if (asprintf(err_str, "Could not connect to machine %s: "
97                                  "%s\n", remote_machine, nt_errstr(result)) == -1) {
98                                 *err_str = NULL;
99                         }
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                         if (asprintf(err_str, "machine %s rejected the session "
116                                  "setup. Error was : %s.\n",        
117                                  remote_machine, nt_errstr(result)) == -1) {
118                                 *err_str = NULL;
119                         }
120                         cli_shutdown(cli);
121                         return result;
122                 }
123
124                 result = cli_init_creds(cli, "", "", NULL);
125                 if (!NT_STATUS_IS_OK(result)) {
126                         cli_shutdown(cli);
127                         return result;
128                 }
129         } else {
130                 result = cli_init_creds(cli, user, domain, old_passwd);
131                 if (!NT_STATUS_IS_OK(result)) {
132                         cli_shutdown(cli);
133                         return result;
134                 }
135         }
136
137         result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
138         if (!NT_STATUS_IS_OK(result)) {
139                 if (asprintf(err_str, "machine %s rejected the tconX on the "
140                              "IPC$ share. Error was : %s.\n",
141                              remote_machine, nt_errstr(result))) {
142                         *err_str = NULL;
143                 }
144                 cli_shutdown(cli);
145                 return result;
146         }
147
148         /* Try not to give the password away too easily */
149
150         if (!pass_must_change) {
151                 result = cli_rpc_pipe_open_ntlmssp(cli,
152                                                    &ndr_table_samr.syntax_id,
153                                                    NCACN_NP,
154                                                    DCERPC_AUTH_LEVEL_PRIVACY,
155                                                    domain, user,
156                                                    old_passwd,
157                                                    &pipe_hnd);
158         } else {
159                 /*
160                  * If the user password must be changed the ntlmssp bind will
161                  * fail the same way as the session setup above did. The
162                  * difference ist that with a pipe bind we don't get a good
163                  * error message, the result will be that the rpc call below
164                  * will just fail. So we do it anonymously, there's no other
165                  * way.
166                  */
167                 result = cli_rpc_pipe_open_noauth(
168                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
169         }
170
171         if (!NT_STATUS_IS_OK(result)) {
172                 if (lp_client_lanman_auth()) {
173                         /* Use the old RAP method. */
174                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
175                                 result = cli_nt_error(cli);
176                                 if (asprintf(err_str, "machine %s rejected the "
177                                          "password change: Error was : %s.\n",
178                                          remote_machine, nt_errstr(result)) == -1) {
179                                         *err_str = NULL;
180                                 }
181                                 cli_shutdown(cli);
182                                 return result;
183                         }
184                 } else {
185                         if (asprintf(err_str, "SAMR connection to machine %s "
186                                  "failed. Error was %s, but LANMAN password "
187                                  "changes are disabled\n",
188                                  remote_machine, nt_errstr(result)) == -1) {
189                                 *err_str = NULL;
190                         }
191                         cli_shutdown(cli);
192                         return result;
193                 }
194         }
195
196         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
197                                              user_name, new_passwd, old_passwd);
198         if (NT_STATUS_IS_OK(result)) {
199                 /* Great - it all worked! */
200                 cli_shutdown(cli);
201                 return NT_STATUS_OK;
202
203         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) 
204                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
205                 /* it failed, but for reasons such as wrong password, too short etc ... */
206
207                 if (asprintf(err_str, "machine %s rejected the password change: "
208                          "Error was : %s.\n",
209                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
210                         *err_str = NULL;
211                 }
212                 cli_shutdown(cli);
213                 return result;
214         }
215
216         /* OK, that failed, so try again... */
217         TALLOC_FREE(pipe_hnd);
218
219         /* Try anonymous NTLMSSP... */
220         result = cli_init_creds(cli, "", "", NULL);
221         if (!NT_STATUS_IS_OK(result)) {
222                 cli_shutdown(cli);
223                 return result;
224         }
225
226         result = NT_STATUS_UNSUCCESSFUL;
227
228         /* OK, this is ugly, but... try an anonymous pipe. */
229         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
230                                           &pipe_hnd);
231
232         if ( NT_STATUS_IS_OK(result) &&
233                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
234                                          pipe_hnd, talloc_tos(), user_name,
235                                          new_passwd, old_passwd)))) {
236                 /* Great - it all worked! */
237                 cli_shutdown(cli);
238                 return NT_STATUS_OK;
239         } else {
240                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) 
241                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
242                         /* it failed, but again it was due to things like new password too short */
243
244                         if (asprintf(err_str, "machine %s rejected the "
245                                  "(anonymous) password change: Error was : "
246                                  "%s.\n", remote_machine,
247                                  get_friendly_nt_error_msg(result)) == -1) {
248                                 *err_str = NULL;
249                         }
250                         cli_shutdown(cli);
251                         return result;
252                 }
253
254                 /* We have failed to change the user's password, and we think the server
255                    just might not support SAMR password changes, so fall back */
256
257                 if (lp_client_lanman_auth()) {
258                         /* Use the old RAP method. */
259                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
260                                 /* SAMR failed, but the old LanMan protocol worked! */
261
262                                 cli_shutdown(cli);
263                                 return NT_STATUS_OK;
264                         }
265
266                         result = cli_nt_error(cli);
267                         if (asprintf(err_str, "machine %s rejected the password "
268                                  "change: Error was : %s.\n",
269                                  remote_machine, nt_errstr(result)) == -1) {
270                                 *err_str = NULL;
271                         }
272                         cli_shutdown(cli);
273                         return result;
274                 } else {
275                         if (asprintf(err_str, "SAMR connection to machine %s "
276                                  "failed. Error was %s, but LANMAN password "
277                                  "changes are disabled\n",
278                                 nt_errstr(result), remote_machine) == -1) {
279                                 *err_str = NULL;
280                         }
281                         cli_shutdown(cli);
282                         return NT_STATUS_UNSUCCESSFUL;
283                 }
284         }
285 }