source: branches/samba-3.2.x/source/libsmb/passchange.c

Last change on this file was 335, checked in by Herwig Bauernfeind, 16 years ago

Update 3.2 to 3.2.14 (final)
File size: 7.9 KB
RevLine 
[335]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
26NTSTATUS 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 "changes 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 if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, pipe_hnd->mem_ctx, user_name,
181 new_passwd, old_passwd))) {
182 /* Great - it all worked! */
183 cli_shutdown(cli);
184 return NT_STATUS_OK;
185
186 } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
187 || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
188 /* it failed, but for reasons such as wrong password, too short etc ... */
189
190 asprintf(err_str, "machine %s rejected the password change: "
191 "Error was : %s.\n",
192 remote_machine, get_friendly_nt_error_msg(result));
193 cli_shutdown(cli);
194 return result;
195 }
196
197 /* OK, that failed, so try again... */
198 cli_rpc_pipe_close(pipe_hnd);
199
200 /* Try anonymous NTLMSSP... */
201 cli_init_creds(cli, "", "", NULL);
202
203 result = NT_STATUS_UNSUCCESSFUL;
204
205 /* OK, this is ugly, but... try an anonymous pipe. */
206 pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
207
208 if ( pipe_hnd &&
209 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
210 pipe_hnd->mem_ctx,
211 user_name,
212 new_passwd,
213 old_passwd)))) {
214 /* Great - it all worked! */
215 cli_shutdown(cli);
216 return NT_STATUS_OK;
217 } else {
218 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
219 || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
220 /* it failed, but again it was due to things like new password too short */
221
222 asprintf(err_str, "machine %s rejected the "
223 "(anonymous) password change: Error was : "
224 "%s.\n", remote_machine,
225 get_friendly_nt_error_msg(result));
226 cli_shutdown(cli);
227 return result;
228 }
229
230 /* We have failed to change the user's password, and we think the server
231 just might not support SAMR password changes, so fall back */
232
233 if (lp_client_lanman_auth()) {
234 /* Use the old RAP method. */
235 if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
236 /* SAMR failed, but the old LanMan protocol worked! */
237
238 cli_shutdown(cli);
239 return NT_STATUS_OK;
240 }
241 asprintf(err_str, "machine %s rejected the password "
242 "change: Error was : %s.\n",
243 remote_machine, cli_errstr(cli) );
244 result = cli_nt_error(cli);
245 cli_shutdown(cli);
246 return result;
247 } else {
248 asprintf(err_str, "SAMR connection to machine %s "
249 "failed. Error was %s, but LANMAN password "
250 "changed are disabled\n",
251 nt_errstr(result), remote_machine);
252 cli_shutdown(cli);
253 return NT_STATUS_UNSUCCESSFUL;
254 }
255 }
256}
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