must add one to the extra_data size to transfer the 0 string terminator.
[Samba/gebeck_regimport.git] / source3 / auth / auth_server.c
blob0ed905e79c849f89048374a7920a25eb85ccad8d
1 /*
2 Unix SMB/CIFS implementation.
3 Authenticate to a remote server
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Andrew Bartlett 2001
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "includes.h"
24 #undef DBGC_CLASS
25 #define DBGC_CLASS DBGC_AUTH
27 extern pstring global_myname;
28 extern userdom_struct current_user_info;
30 /****************************************************************************
31 Support for server level security.
32 ****************************************************************************/
34 static struct cli_state *server_cryptkey(TALLOC_CTX *mem_ctx)
36 struct cli_state *cli = NULL;
37 fstring desthost;
38 struct in_addr dest_ip;
39 char *p, *pserver;
40 BOOL connected_ok = False;
42 if (!(cli = cli_initialise(cli)))
43 return NULL;
45 /* security = server just can't function with spnego */
46 cli->use_spnego = False;
48 pserver = talloc_strdup(mem_ctx, lp_passwordserver());
49 p = pserver;
51 while(next_token( &p, desthost, LIST_SEP, sizeof(desthost))) {
52 standard_sub_basic(current_user_info.smb_name, desthost, sizeof(desthost));
53 strupper(desthost);
55 if(!resolve_name( desthost, &dest_ip, 0x20)) {
56 DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost));
57 continue;
60 if (ismyip(dest_ip)) {
61 DEBUG(1,("Password server loop - disabling password server %s\n",desthost));
62 continue;
65 /* we use a mutex to prevent two connections at once - when a
66 Win2k PDC get two connections where one hasn't completed a
67 session setup yet it will send a TCP reset to the first
68 connection (tridge) */
70 if (!grab_server_mutex(desthost)) {
71 return NULL;
74 if (cli_connect(cli, desthost, &dest_ip)) {
75 DEBUG(3,("connected to password server %s\n",desthost));
76 connected_ok = True;
77 break;
81 if (!connected_ok) {
82 release_server_mutex();
83 DEBUG(0,("password server not available\n"));
84 cli_shutdown(cli);
85 return NULL;
88 if (!attempt_netbios_session_request(cli, global_myname,
89 desthost, &dest_ip)) {
90 release_server_mutex();
91 DEBUG(1,("password server fails session request\n"));
92 cli_shutdown(cli);
93 return NULL;
96 if (strequal(desthost,myhostname())) {
97 exit_server("Password server loop!");
100 DEBUG(3,("got session\n"));
102 if (!cli_negprot(cli)) {
103 DEBUG(1,("%s rejected the negprot\n",desthost));
104 release_server_mutex();
105 cli_shutdown(cli);
106 return NULL;
109 if (cli->protocol < PROTOCOL_LANMAN2 ||
110 !(cli->sec_mode & NEGOTIATE_SECURITY_USER_LEVEL)) {
111 DEBUG(1,("%s isn't in user level security mode\n",desthost));
112 release_server_mutex();
113 cli_shutdown(cli);
114 return NULL;
117 /* Get the first session setup done quickly, to avoid silly
118 Win2k bugs. (The next connection to the server will kill
119 this one...
122 if (!cli_session_setup(cli, "", "", 0, "", 0,
123 "")) {
124 DEBUG(0,("%s rejected the initial session setup (%s)\n",
125 desthost, cli_errstr(cli)));
126 release_server_mutex();
127 cli_shutdown(cli);
128 return NULL;
131 release_server_mutex();
133 DEBUG(3,("password server OK\n"));
135 return cli;
138 /****************************************************************************
139 Clean up our allocated cli.
140 ****************************************************************************/
142 static void free_server_private_data(void **private_data_pointer)
144 struct cli_state **cli = (struct cli_state **)private_data_pointer;
145 if (*cli && (*cli)->initialised) {
146 cli_shutdown(*cli);
150 /****************************************************************************
151 Send a 'keepalive' packet down the cli pipe.
152 ****************************************************************************/
154 static void send_server_keepalive(void **private_data_pointer)
156 struct cli_state **cli = (struct cli_state **)private_data_pointer;
158 /* also send a keepalive to the password server if its still
159 connected */
160 if (cli && *cli && (*cli)->initialised) {
161 if (!send_keepalive((*cli)->fd)) {
162 DEBUG( 2, ( "password server keepalive failed.\n"));
163 cli_shutdown(*cli);
168 /****************************************************************************
169 Get the challenge out of a password server.
170 ****************************************************************************/
172 static DATA_BLOB auth_get_challenge_server(const struct auth_context *auth_context,
173 void **my_private_data,
174 TALLOC_CTX *mem_ctx)
176 struct cli_state *cli = server_cryptkey(mem_ctx);
178 if (cli) {
179 DEBUG(3,("using password server validation\n"));
181 if ((cli->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) {
182 /* We can't work with unencrypted password servers
183 unless 'encrypt passwords = no' */
184 DEBUG(5,("make_auth_info_server: Server is unencrypted, no challenge available..\n"));
186 /* However, it is still a perfectly fine connection
187 to pass that unencrypted password over */
188 *my_private_data = (void *)cli;
189 return data_blob(NULL, 0);
191 } else if (cli->secblob.length < 8) {
192 /* We can't do much if we don't get a full challenge */
193 DEBUG(2,("make_auth_info_server: Didn't receive a full challenge from server\n"));
194 cli_shutdown(cli);
195 return data_blob(NULL, 0);
198 *my_private_data = (void *)cli;
200 /* The return must be allocated on the caller's mem_ctx, as our own will be
201 destoyed just after the call. */
202 return data_blob_talloc(auth_context->mem_ctx, cli->secblob.data,8);
203 } else {
204 return data_blob(NULL, 0);
209 /****************************************************************************
210 Check for a valid username and password in security=server mode.
211 - Validate a password with the password server.
212 ****************************************************************************/
214 static NTSTATUS check_smbserver_security(const struct auth_context *auth_context,
215 void *my_private_data,
216 TALLOC_CTX *mem_ctx,
217 const auth_usersupplied_info *user_info,
218 auth_serversupplied_info **server_info)
220 struct cli_state *cli;
221 static unsigned char badpass[24];
222 static fstring baduser;
223 static BOOL tested_password_server = False;
224 static BOOL bad_password_server = False;
225 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
226 BOOL locally_made_cli = False;
229 * Check that the requested domain is not our own machine name.
230 * If it is, we should never check the PDC here, we use our own local
231 * password file.
234 if(is_netbios_alias_or_name(user_info->domain.str)) {
235 DEBUG(3,("check_smbserver_security: Requested domain was for this machine.\n"));
236 return NT_STATUS_LOGON_FAILURE;
239 cli = my_private_data;
241 if (cli) {
242 } else {
243 cli = server_cryptkey(mem_ctx);
244 locally_made_cli = True;
247 if (!cli || !cli->initialised) {
248 DEBUG(1,("password server is not connected (cli not initilised)\n"));
249 return NT_STATUS_LOGON_FAILURE;
252 if ((cli->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) {
253 if (user_info->encrypted) {
254 DEBUG(1,("password server %s is plaintext, but we are encrypted. This just can't work :-(\n", cli->desthost));
255 return NT_STATUS_LOGON_FAILURE;
257 } else {
258 if (memcmp(cli->secblob.data, auth_context->challenge.data, 8) != 0) {
259 DEBUG(1,("the challenge that the password server (%s) supplied us is not the one we gave our client. This just can't work :-(\n", cli->desthost));
260 return NT_STATUS_LOGON_FAILURE;
264 if(badpass[0] == 0)
265 memset(badpass, 0x1f, sizeof(badpass));
267 if((user_info->nt_resp.length == sizeof(badpass)) &&
268 !memcmp(badpass, user_info->nt_resp.data, sizeof(badpass))) {
270 * Very unlikely, our random bad password is the same as the users
271 * password.
273 memset(badpass, badpass[0]+1, sizeof(badpass));
276 if(baduser[0] == 0) {
277 fstrcpy(baduser, INVALID_USER_PREFIX);
278 fstrcat(baduser, global_myname);
282 * Attempt a session setup with a totally incorrect password.
283 * If this succeeds with the guest bit *NOT* set then the password
284 * server is broken and is not correctly setting the guest bit. We
285 * need to detect this as some versions of NT4.x are broken. JRA.
288 /* I sure as hell hope that there aren't servers out there that take
289 * NTLMv2 and have this bug, as we don't test for that...
290 * - abartlet@samba.org
293 if ((!tested_password_server) && (lp_paranoid_server_security())) {
294 if (cli_session_setup(cli, baduser, (char *)badpass, sizeof(badpass),
295 (char *)badpass, sizeof(badpass), user_info->domain.str)) {
298 * We connected to the password server so we
299 * can say we've tested it.
301 tested_password_server = True;
303 if ((SVAL(cli->inbuf,smb_vwv2) & 1) == 0) {
304 DEBUG(0,("server_validate: password server %s allows users as non-guest \
305 with a bad password.\n", cli->desthost));
306 DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \
307 use this machine as the password server.\n"));
308 cli_ulogoff(cli);
311 * Password server has the bug.
313 bad_password_server = True;
314 return NT_STATUS_LOGON_FAILURE;
316 cli_ulogoff(cli);
318 } else {
321 * We have already tested the password server.
322 * Fail immediately if it has the bug.
325 if(bad_password_server) {
326 DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \
327 with a bad password.\n", cli->desthost));
328 DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \
329 use this machine as the password server.\n"));
330 return NT_STATUS_LOGON_FAILURE;
335 * Now we know the password server will correctly set the guest bit, or is
336 * not guest enabled, we can try with the real password.
339 if (!user_info->encrypted) {
340 /* Plaintext available */
341 if (!cli_session_setup(cli, user_info->smb_name.str,
342 (char *)user_info->plaintext_password.data,
343 user_info->plaintext_password.length,
344 NULL, 0,
345 user_info->domain.str)) {
346 DEBUG(1,("password server %s rejected the password\n", cli->desthost));
347 /* Make this cli_nt_error() when the conversion is in */
348 nt_status = cli_nt_error(cli);
349 } else {
350 nt_status = NT_STATUS_OK;
352 } else {
353 if (!cli_session_setup(cli, user_info->smb_name.str,
354 (char *)user_info->lm_resp.data,
355 user_info->lm_resp.length,
356 (char *)user_info->nt_resp.data,
357 user_info->nt_resp.length,
358 user_info->domain.str)) {
359 DEBUG(1,("password server %s rejected the password\n", cli->desthost));
360 /* Make this cli_nt_error() when the conversion is in */
361 nt_status = cli_nt_error(cli);
362 } else {
363 nt_status = NT_STATUS_OK;
367 /* if logged in as guest then reject */
368 if ((SVAL(cli->inbuf,smb_vwv2) & 1) != 0) {
369 DEBUG(1,("password server %s gave us guest only\n", cli->desthost));
370 nt_status = NT_STATUS_LOGON_FAILURE;
373 cli_ulogoff(cli);
375 if NT_STATUS_IS_OK(nt_status) {
376 struct passwd *pass = Get_Pwnam(user_info->internal_username.str);
377 if (pass) {
378 nt_status = make_server_info_pw(server_info, pass);
379 } else {
380 nt_status = NT_STATUS_NO_SUCH_USER;
384 if (locally_made_cli) {
385 cli_shutdown(cli);
388 return(nt_status);
391 NTSTATUS auth_init_smbserver(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
393 if (!make_auth_methods(auth_context, auth_method)) {
394 return NT_STATUS_NO_MEMORY;
396 (*auth_method)->name = "smbserver";
397 (*auth_method)->auth = check_smbserver_security;
398 (*auth_method)->get_chal = auth_get_challenge_server;
399 (*auth_method)->send_keepalive = send_server_keepalive;
400 (*auth_method)->free_private_data = free_server_private_data;
401 return NT_STATUS_OK;