source: branches/samba-3.5.x/source3/libsmb/passchange.c@ 850

Last change on this file since 850 was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 8.9 KB
Line 
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 = NULL;
32 struct rpc_pipe_client *pipe_hnd = NULL;
33 struct sockaddr_storage ss;
34 char *user, *domain, *p;
35
36 NTSTATUS result;
37 bool pass_must_change = False;
38
39 user = talloc_strdup(talloc_tos(), user_name);
40 SMB_ASSERT(user != NULL);
41 domain = talloc_strdup(talloc_tos(), "");
42 SMB_ASSERT(domain != NULL);
43
44 /* allow usernames of the form domain\\user or domain/user */
45 if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
46 (p = strchr_m(user,*lp_winbind_separator()))) {
47 *p = 0;
48 domain = user;
49 user = p+1;
50 }
51
52 *err_str = NULL;
53
54 if(!resolve_name( remote_machine, &ss, 0x20, false)) {
55 if (asprintf(err_str, "Unable to find an IP address for machine "
56 "%s.\n", remote_machine) == -1) {
57 *err_str = NULL;
58 }
59 return NT_STATUS_UNSUCCESSFUL;
60 }
61
62 cli = cli_initialise();
63 if (!cli) {
64 return NT_STATUS_NO_MEMORY;
65 }
66
67 result = cli_connect(cli, remote_machine, &ss);
68 if (!NT_STATUS_IS_OK(result)) {
69 if (asprintf(err_str, "Unable to connect to SMB server on "
70 "machine %s. Error was : %s.\n",
71 remote_machine, nt_errstr(result))==-1) {
72 *err_str = NULL;
73 }
74 cli_shutdown(cli);
75 return result;
76 }
77
78 make_nmb_name(&calling, global_myname() , 0x0);
79 make_nmb_name(&called , remote_machine, 0x20);
80
81 if (!cli_session_request(cli, &calling, &called)) {
82 if (asprintf(err_str, "machine %s rejected the session setup. "
83 "Error was : %s.\n",
84 remote_machine, cli_errstr(cli)) == -1) {
85 *err_str = NULL;
86 }
87 result = cli_nt_error(cli);
88 cli_shutdown(cli);
89 return result;
90 }
91
92 cli->protocol = PROTOCOL_NT1;
93
94 result = cli_negprot(cli);
95
96 if (!NT_STATUS_IS_OK(result)) {
97 if (asprintf(err_str, "machine %s rejected the negotiate "
98 "protocol. Error was : %s.\n",
99 remote_machine, nt_errstr(result)) == -1) {
100 *err_str = NULL;
101 }
102 result = cli_nt_error(cli);
103 cli_shutdown(cli);
104 return result;
105 }
106
107 /* Given things like SMB signing, restrict anonymous and the like,
108 try an authenticated connection first */
109 result = cli_session_setup(cli, user_name,
110 old_passwd, strlen(old_passwd)+1,
111 old_passwd, strlen(old_passwd)+1, "");
112
113 if (!NT_STATUS_IS_OK(result)) {
114
115 /* Password must change or Password expired are the only valid
116 * error conditions here from where we can proceed, the rest like
117 * account locked out or logon failure will lead to errors later
118 * anyway */
119
120 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
121 !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
122 if (asprintf(err_str, "Could not connect to machine %s: "
123 "%s\n", remote_machine, cli_errstr(cli)) == -1) {
124 *err_str = NULL;
125 }
126 cli_shutdown(cli);
127 return result;
128 }
129
130 pass_must_change = True;
131
132 /*
133 * We should connect as the anonymous user here, in case
134 * the server has "must change password" checked...
135 * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
136 */
137
138 result = cli_session_setup(cli, "", "", 0, "", 0, "");
139
140 if (!NT_STATUS_IS_OK(result)) {
141 if (asprintf(err_str, "machine %s rejected the session "
142 "setup. Error was : %s.\n",
143 remote_machine, cli_errstr(cli)) == -1) {
144 *err_str = NULL;
145 }
146 cli_shutdown(cli);
147 return result;
148 }
149
150 result = cli_init_creds(cli, "", "", NULL);
151 if (!NT_STATUS_IS_OK(result)) {
152 cli_shutdown(cli);
153 return result;
154 }
155 } else {
156 result = cli_init_creds(cli, user, domain, old_passwd);
157 if (!NT_STATUS_IS_OK(result)) {
158 cli_shutdown(cli);
159 return result;
160 }
161 }
162
163 result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
164 if (!NT_STATUS_IS_OK(result)) {
165 if (asprintf(err_str, "machine %s rejected the tconX on the "
166 "IPC$ share. Error was : %s.\n",
167 remote_machine, nt_errstr(result))) {
168 *err_str = NULL;
169 }
170 cli_shutdown(cli);
171 return result;
172 }
173
174 /* Try not to give the password away too easily */
175
176 if (!pass_must_change) {
177 result = cli_rpc_pipe_open_ntlmssp(cli,
178 &ndr_table_samr.syntax_id,
179 NCACN_NP,
180 DCERPC_AUTH_LEVEL_PRIVACY,
181 domain, user,
182 old_passwd,
183 &pipe_hnd);
184 } else {
185 /*
186 * If the user password must be changed the ntlmssp bind will
187 * fail the same way as the session setup above did. The
188 * difference ist that with a pipe bind we don't get a good
189 * error message, the result will be that the rpc call below
190 * will just fail. So we do it anonymously, there's no other
191 * way.
192 */
193 result = cli_rpc_pipe_open_noauth(
194 cli, &ndr_table_samr.syntax_id, &pipe_hnd);
195 }
196
197 if (!NT_STATUS_IS_OK(result)) {
198 if (lp_client_lanman_auth()) {
199 /* Use the old RAP method. */
200 if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
201 if (asprintf(err_str, "machine %s rejected the "
202 "password change: Error was : %s.\n",
203 remote_machine, cli_errstr(cli)) == -1) {
204 *err_str = NULL;
205 }
206 result = cli_nt_error(cli);
207 cli_shutdown(cli);
208 return result;
209 }
210 } else {
211 if (asprintf(err_str, "SAMR connection to machine %s "
212 "failed. Error was %s, but LANMAN password "
213 "changes are disabled\n",
214 remote_machine, nt_errstr(result)) == -1) {
215 *err_str = NULL;
216 }
217 result = cli_nt_error(cli);
218 cli_shutdown(cli);
219 return result;
220 }
221 }
222
223 result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
224 user_name, new_passwd, old_passwd);
225 if (NT_STATUS_IS_OK(result)) {
226 /* Great - it all worked! */
227 cli_shutdown(cli);
228 return NT_STATUS_OK;
229
230 } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
231 || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
232 /* it failed, but for reasons such as wrong password, too short etc ... */
233
234 if (asprintf(err_str, "machine %s rejected the password change: "
235 "Error was : %s.\n",
236 remote_machine, get_friendly_nt_error_msg(result)) == -1) {
237 *err_str = NULL;
238 }
239 cli_shutdown(cli);
240 return result;
241 }
242
243 /* OK, that failed, so try again... */
244 TALLOC_FREE(pipe_hnd);
245
246 /* Try anonymous NTLMSSP... */
247 result = cli_init_creds(cli, "", "", NULL);
248 if (!NT_STATUS_IS_OK(result)) {
249 cli_shutdown(cli);
250 return result;
251 }
252
253 result = NT_STATUS_UNSUCCESSFUL;
254
255 /* OK, this is ugly, but... try an anonymous pipe. */
256 result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
257 &pipe_hnd);
258
259 if ( NT_STATUS_IS_OK(result) &&
260 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
261 pipe_hnd, talloc_tos(), user_name,
262 new_passwd, old_passwd)))) {
263 /* Great - it all worked! */
264 cli_shutdown(cli);
265 return NT_STATUS_OK;
266 } else {
267 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
268 || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
269 /* it failed, but again it was due to things like new password too short */
270
271 if (asprintf(err_str, "machine %s rejected the "
272 "(anonymous) password change: Error was : "
273 "%s.\n", remote_machine,
274 get_friendly_nt_error_msg(result)) == -1) {
275 *err_str = NULL;
276 }
277 cli_shutdown(cli);
278 return result;
279 }
280
281 /* We have failed to change the user's password, and we think the server
282 just might not support SAMR password changes, so fall back */
283
284 if (lp_client_lanman_auth()) {
285 /* Use the old RAP method. */
286 if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
287 /* SAMR failed, but the old LanMan protocol worked! */
288
289 cli_shutdown(cli);
290 return NT_STATUS_OK;
291 }
292 if (asprintf(err_str, "machine %s rejected the password "
293 "change: Error was : %s.\n",
294 remote_machine, cli_errstr(cli)) == -1) {
295 *err_str = NULL;
296 }
297 result = cli_nt_error(cli);
298 cli_shutdown(cli);
299 return result;
300 } else {
301 if (asprintf(err_str, "SAMR connection to machine %s "
302 "failed. Error was %s, but LANMAN password "
303 "changed are disabled\n",
304 nt_errstr(result), remote_machine) == -1) {
305 *err_str = NULL;
306 }
307 cli_shutdown(cli);
308 return NT_STATUS_UNSUCCESSFUL;
309 }
310 }
311}
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