2 Unix SMB/CIFS implementation.
3 krb5 set password implementation
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Remus Koos 2001 (remuskoos@yahoo.com)
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.
26 #define DEFAULT_KPASSWD_PORT 464
27 #define KRB5_KPASSWD_VERS_CHANGEPW 1
28 #define KRB5_KPASSWD_VERS_SETPW 0xff80
29 #define KRB5_KPASSWD_ACCESSDENIED 5
30 #define KRB5_KPASSWD_BAD_VERSION 6
32 /* This implements the Kerb password change protocol as specifed in
33 * kerb-chg-password-02.txt
35 static DATA_BLOB encode_krb5_setpw(const char *principal, const char *password)
37 char* princ_part1 = NULL;
38 char* princ_part2 = NULL;
47 princ = strdup(principal);
49 if ((c = strchr(princ, '/')) == NULL) {
59 if ((c = strchr(c, '@')) != NULL) {
65 memset(&req, 0, sizeof(req));
67 asn1_push_tag(&req, ASN1_SEQUENCE(0));
68 asn1_push_tag(&req, ASN1_CONTEXT(0));
69 asn1_write_OctetString(&req, password, strlen(password));
72 asn1_push_tag(&req, ASN1_CONTEXT(1));
73 asn1_push_tag(&req, ASN1_SEQUENCE(0));
75 asn1_push_tag(&req, ASN1_CONTEXT(0));
76 asn1_write_Integer(&req, 1);
79 asn1_push_tag(&req, ASN1_CONTEXT(1));
80 asn1_push_tag(&req, ASN1_SEQUENCE(0));
83 asn1_write_GeneralString(&req, princ_part1);
85 asn1_write_GeneralString(&req, princ_part2);
91 asn1_push_tag(&req, ASN1_CONTEXT(2));
92 asn1_write_GeneralString(&req, realm);
96 ret = data_blob(req.data, req.length);
104 static krb5_error_code build_setpw_request(krb5_context context,
105 krb5_auth_context auth_context,
113 krb5_data encoded_setpw;
114 krb5_replay_data replay;
118 ret = krb5_auth_con_setflags(context,
119 auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE);
121 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
122 error_message(ret)));
126 setpw = encode_krb5_setpw(princ, passwd);
128 encoded_setpw.data = setpw.data;
129 encoded_setpw.length = setpw.length;
131 ret = krb5_mk_priv(context, auth_context,
132 &encoded_setpw, &cipherpw, &replay);
134 data_blob_free(&setpw); /*from 'encode_krb5_setpw(...)' */
137 DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret)));
141 packet->data = (char *)malloc(ap_req->length + cipherpw.length + 6);
145 /* see the RFC for details */
146 p = ((char *)packet->data) + 2;
147 RSSVAL(p, 0, 0xff80);
149 RSSVAL(p, 0, ap_req->length);
151 memcpy(p, ap_req->data, ap_req->length);
153 memcpy(p, cipherpw.data, cipherpw.length);
154 p += cipherpw.length;
155 packet->length = PTR_DIFF(p,packet->data);
156 RSSVAL(packet->data, 0, packet->length);
158 free(cipherpw.data); /* from 'krb5_mk_priv(...)' */
163 static krb5_error_code parse_setpw_reply(krb5_context context,
164 krb5_auth_context auth_context,
169 int vnum, ret, res_code;
170 krb5_data cipherresult;
171 krb5_data clearresult;
172 krb5_ap_rep_enc_part *ap_rep_enc;
173 krb5_replay_data replay;
175 if (packet->length < 4) {
176 return KRB5KRB_AP_ERR_MODIFIED;
181 if (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e) {
182 /* it's an error packet. We should parse it ... */
183 DEBUG(1,("Got error packet 0x%x from kpasswd server\n",
184 ((char *)packet->data)[0]));
185 return KRB5KRB_AP_ERR_MODIFIED;
188 if (RSVAL(p, 0) != packet->length) {
189 DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
190 RSVAL(p, 0), packet->length));
191 return KRB5KRB_AP_ERR_MODIFIED;
196 vnum = RSVAL(p, 0); p += 2;
198 if (vnum != KRB5_KPASSWD_VERS_SETPW && vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
199 DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
200 return KRB5KDC_ERR_BAD_PVNO;
203 ap_rep.length = RSVAL(p, 0); p += 2;
205 if (p + ap_rep.length >= (char *)packet->data + packet->length) {
206 DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
207 return KRB5KRB_AP_ERR_MODIFIED;
210 if (ap_rep.length == 0) {
211 DEBUG(1,("got unencrypted setpw result?!\n"));
212 return KRB5KRB_AP_ERR_MODIFIED;
219 ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
221 DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret)));
222 return KRB5KRB_AP_ERR_MODIFIED;
225 krb5_free_ap_rep_enc_part(context, ap_rep_enc);
227 cipherresult.data = p;
228 cipherresult.length = ((char *)packet->data + packet->length) - p;
230 ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
233 DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret)));
234 return KRB5KRB_AP_ERR_MODIFIED;
237 if (clearresult.length < 2) {
238 free(clearresult.data);
239 ret = KRB5KRB_AP_ERR_MODIFIED;
240 return KRB5KRB_AP_ERR_MODIFIED;
243 p = clearresult.data;
245 res_code = RSVAL(p, 0);
247 free(clearresult.data);
249 if ((res_code < KRB5_KPASSWD_SUCCESS) ||
250 (res_code >= KRB5_KPASSWD_ACCESSDENIED)) {
251 return KRB5KRB_AP_ERR_MODIFIED;
257 ADS_STATUS krb5_set_password(const char *kdc_host, const char *princ, const char *newpw,
260 krb5_context context;
261 krb5_auth_context auth_context = NULL;
262 krb5_principal principal;
265 krb5_creds creds, *credsp;
267 krb5_data ap_req, chpw_req, chpw_rep;
268 int ret, sock, addr_len;
269 struct sockaddr remote_addr, local_addr;
270 krb5_address local_kaddr, remote_kaddr;
272 ret = krb5_init_context(&context);
274 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
275 return ADS_ERROR_KRB5(ret);
278 if (time_offset != 0) {
279 krb5_set_real_time(context, time(NULL) + time_offset, 0);
282 ret = krb5_cc_default(context, &ccache);
284 krb5_free_context(context);
285 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
286 return ADS_ERROR_KRB5(ret);
291 realm = strchr(princ, '@');
294 asprintf(&princ_name, "kadmin/changepw@%s", realm);
295 ret = krb5_parse_name(context, princ_name, &creds.server);
297 krb5_free_context(context);
298 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
299 return ADS_ERROR_KRB5(ret);
303 /* parse the principal we got as a function argument */
304 ret = krb5_parse_name(context, princ, &principal);
306 krb5_free_context(context);
307 DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
308 return ADS_ERROR_KRB5(ret);
311 krb5_princ_set_realm(context, creds.server,
312 krb5_princ_realm(context, principal));
314 ret = krb5_cc_get_principal(context, ccache, &creds.client);
316 krb5_free_principal(context, principal);
317 krb5_free_context(context);
318 DEBUG(1,("Failed to get principal from ccache (%s)\n",
319 error_message(ret)));
320 return ADS_ERROR_KRB5(ret);
323 ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
325 krb5_free_principal(context, creds.client);
326 krb5_free_principal(context, principal);
327 krb5_free_context(context);
328 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
329 return ADS_ERROR_KRB5(ret);
332 /* we might have to call krb5_free_creds(...) from now on ... */
333 ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
334 NULL, credsp, &ap_req);
336 krb5_free_creds(context, credsp);
337 krb5_free_principal(context, creds.client);
338 krb5_free_principal(context, principal);
339 krb5_free_context(context);
340 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
341 return ADS_ERROR_KRB5(ret);
344 sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
348 krb5_free_creds(context, credsp);
349 krb5_free_principal(context, creds.client);
350 krb5_free_principal(context, principal);
351 krb5_free_context(context);
352 DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
353 kdc_host, strerror(errno)));
354 return ADS_ERROR_SYSTEM(rc);
357 addr_len = sizeof(remote_addr);
358 getpeername(sock, &remote_addr, &addr_len);
359 addr_len = sizeof(local_addr);
360 getsockname(sock, &local_addr, &addr_len);
362 setup_kaddr(&remote_kaddr, &remote_addr);
363 setup_kaddr(&local_kaddr, &local_addr);
365 ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
369 krb5_free_creds(context, credsp);
370 krb5_free_principal(context, creds.client);
371 krb5_free_principal(context, principal);
372 krb5_free_context(context);
373 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
374 return ADS_ERROR_KRB5(ret);
377 ret = build_setpw_request(context, auth_context, &ap_req,
378 princ, newpw, &chpw_req);
382 krb5_free_creds(context, credsp);
383 krb5_free_principal(context, creds.client);
384 krb5_free_principal(context, principal);
385 krb5_free_context(context);
386 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
387 return ADS_ERROR_KRB5(ret);
390 if (write(sock, chpw_req.data, chpw_req.length) != chpw_req.length) {
394 krb5_free_creds(context, credsp);
395 krb5_free_principal(context, creds.client);
396 krb5_free_principal(context, principal);
397 krb5_free_context(context);
398 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
399 return ADS_ERROR_SYSTEM(errno);
404 chpw_rep.length = 1500;
405 chpw_rep.data = (char *) malloc(chpw_rep.length);
406 if (!chpw_rep.data) {
409 krb5_free_creds(context, credsp);
410 krb5_free_principal(context, creds.client);
411 krb5_free_principal(context, principal);
412 krb5_free_context(context);
413 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
415 return ADS_ERROR_SYSTEM(errno);
418 ret = read(sock, chpw_rep.data, chpw_rep.length);
423 krb5_free_creds(context, credsp);
424 krb5_free_principal(context, creds.client);
425 krb5_free_principal(context, principal);
426 krb5_free_context(context);
427 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
428 return ADS_ERROR_SYSTEM(errno);
432 chpw_rep.length = ret;
434 ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
438 krb5_free_creds(context, credsp);
439 krb5_free_principal(context, creds.client);
440 krb5_free_principal(context, principal);
441 krb5_free_context(context);
442 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
443 error_message(ret)));
444 return ADS_ERROR_KRB5(ret);
447 ret = parse_setpw_reply(context, auth_context, &chpw_rep);
452 krb5_free_creds(context, credsp);
453 krb5_free_principal(context, creds.client);
454 krb5_free_principal(context, principal);
455 krb5_free_context(context);
456 DEBUG(1,("parse_setpw_reply failed (%s)\n",
457 error_message(ret)));
458 return ADS_ERROR_KRB5(ret);
462 krb5_free_creds(context, credsp);
463 krb5_free_principal(context, creds.client);
464 krb5_free_principal(context, principal);
465 krb5_free_context(context);
471 ADS_STATUS kerberos_set_password(const char *kpasswd_server,
472 const char *auth_principal, const char *auth_password,
473 const char *target_principal, const char *new_password,
478 if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset))) {
479 DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
480 return ADS_ERROR_KRB5(ret);
483 return krb5_set_password(kpasswd_server, target_principal, new_password, time_offset);
488 * Set the machine account password
489 * @param ads connection to ads server
490 * @param hostname machine whose password is being set
491 * @param password new password
492 * @return status of password change
494 ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
495 const char *hostname,
496 const char *password)
499 char *host = strdup(hostname);
505 we need to use the '$' form of the name here, as otherwise the
506 server might end up setting the password for a user instead
508 asprintf(&principal, "%s$@%s", host, ads->auth.realm);
510 status = krb5_set_password(ads->auth.kdc_server, principal, password, ads->auth.time_offset);