2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <krb5_locl.h>
39 #define __attribute__(X)
43 str2data (krb5_data *d,
45 ...) __attribute__ ((format (printf, 2, 3)));
48 str2data (krb5_data *d,
56 d->length = vasprintf (&str, fmt, args);
62 * Change password protocol defined by
63 * draft-ietf-cat-kerb-chg-password-02.txt
65 * Share the response part of the protocol with MS set password
69 static krb5_error_code
70 chgpw_send_request (krb5_context context,
71 krb5_auth_context *auth_context,
73 krb5_principal targprinc,
80 krb5_data ap_req_data;
81 krb5_data krb_priv_data;
82 krb5_data passwd_data;
90 return KRB5_KPASSWD_MALFORMED;
93 krb5_principal_compare(context, creds->client, targprinc) != TRUE)
94 return KRB5_KPASSWD_MALFORMED;
96 krb5_data_zero (&ap_req_data);
98 ret = krb5_mk_req_extended (context,
100 AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
107 passwd_data.data = rk_UNCONST(passwd);
108 passwd_data.length = strlen(passwd);
110 krb5_data_zero (&krb_priv_data);
112 ret = krb5_mk_priv (context,
120 len = 6 + ap_req_data.length + krb_priv_data.length;
122 *p++ = (len >> 8) & 0xFF;
123 *p++ = (len >> 0) & 0xFF;
126 *p++ = (ap_req_data.length >> 8) & 0xFF;
127 *p++ = (ap_req_data.length >> 0) & 0xFF;
129 memset(&msghdr, 0, sizeof(msghdr));
130 msghdr.msg_name = NULL;
131 msghdr.msg_namelen = 0;
132 msghdr.msg_iov = iov;
133 msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
135 msghdr.msg_control = NULL;
136 msghdr.msg_controllen = 0;
139 iov[0].iov_base = (void*)header;
141 iov[1].iov_base = ap_req_data.data;
142 iov[1].iov_len = ap_req_data.length;
143 iov[2].iov_base = krb_priv_data.data;
144 iov[2].iov_len = krb_priv_data.length;
146 if (sendmsg (sock, &msghdr, 0) < 0) {
148 krb5_set_error_message(context, ret, "sendmsg %s: %s",
149 host, strerror(ret));
152 krb5_data_free (&krb_priv_data);
154 krb5_data_free (&ap_req_data);
159 * Set password protocol as defined by RFC3244 --
160 * Microsoft Windows 2000 Kerberos Change Password and Set Password Protocols
163 static krb5_error_code
164 setpw_send_request (krb5_context context,
165 krb5_auth_context *auth_context,
167 krb5_principal targprinc,
174 krb5_data ap_req_data;
175 krb5_data krb_priv_data;
177 ChangePasswdDataMS chpw;
179 u_char header[4 + 6];
182 struct msghdr msghdr;
184 krb5_data_zero (&ap_req_data);
186 ret = krb5_mk_req_extended (context,
188 AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
195 chpw.newpasswd.length = strlen(passwd);
196 chpw.newpasswd.data = rk_UNCONST(passwd);
198 chpw.targname = &targprinc->name;
199 chpw.targrealm = &targprinc->realm;
201 chpw.targname = NULL;
202 chpw.targrealm = NULL;
205 ASN1_MALLOC_ENCODE(ChangePasswdDataMS, pwd_data.data, pwd_data.length,
208 krb5_data_free (&ap_req_data);
212 if(pwd_data.length != len)
213 krb5_abortx(context, "internal error in ASN.1 encoder");
215 ret = krb5_mk_priv (context,
223 len = 6 + ap_req_data.length + krb_priv_data.length;
226 _krb5_put_int(p, len, 4);
229 *p++ = (len >> 8) & 0xFF;
230 *p++ = (len >> 0) & 0xFF;
233 *p++ = (ap_req_data.length >> 8) & 0xFF;
234 *p++ = (ap_req_data.length >> 0) & 0xFF;
236 memset(&msghdr, 0, sizeof(msghdr));
237 msghdr.msg_name = NULL;
238 msghdr.msg_namelen = 0;
239 msghdr.msg_iov = iov;
240 msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
242 msghdr.msg_control = NULL;
243 msghdr.msg_controllen = 0;
246 iov[0].iov_base = (void*)header;
251 iov[1].iov_base = ap_req_data.data;
252 iov[1].iov_len = ap_req_data.length;
253 iov[2].iov_base = krb_priv_data.data;
254 iov[2].iov_len = krb_priv_data.length;
256 if (sendmsg (sock, &msghdr, 0) < 0) {
258 krb5_set_error_message(context, ret, "sendmsg %s: %s",
259 host, strerror(ret));
262 krb5_data_free (&krb_priv_data);
264 krb5_data_free (&ap_req_data);
265 krb5_data_free (&pwd_data);
269 static krb5_error_code
270 process_reply (krb5_context context,
271 krb5_auth_context auth_context,
275 krb5_data *result_code_string,
276 krb5_data *result_string,
280 u_char reply[1024 * 3];
282 uint16_t pkt_len, pkt_ver;
283 krb5_data ap_rep_data;
288 while (len < sizeof(reply)) {
291 ret = recvfrom (sock, reply + len, sizeof(reply) - len,
295 krb5_set_error_message(context, save_errno,
297 host, strerror(save_errno));
299 } else if (ret == 0) {
300 krb5_set_error_message(context, 1,"recvfrom timeout %s", host);
306 _krb5_get_int(reply, &size, 4);
309 memmove(reply, reply + 4, size);
313 if (len == sizeof(reply)) {
314 krb5_set_error_message(context, ENOMEM,
315 N_("Message too large from %s", "host"),
320 ret = recvfrom (sock, reply, sizeof(reply), 0, NULL, NULL);
323 krb5_set_error_message(context, save_errno,
325 host, strerror(save_errno));
332 str2data (result_string, "server %s sent to too short message "
333 "(%ld bytes)", host, (long)len);
334 *result_code = KRB5_KPASSWD_MALFORMED;
338 pkt_len = (reply[0] << 8) | (reply[1]);
339 pkt_ver = (reply[2] << 8) | (reply[3]);
341 if ((pkt_len != len) || (reply[1] == 0x7e || reply[1] == 0x5e)) {
346 memset(&error, 0, sizeof(error));
348 ret = decode_KRB_ERROR(reply, len, &error, &size);
352 if (error.e_data->length < 2) {
353 str2data(result_string, "server %s sent too short "
354 "e_data to print anything usable", host);
355 free_KRB_ERROR(&error);
356 *result_code = KRB5_KPASSWD_MALFORMED;
360 p = error.e_data->data;
361 *result_code = (p[0] << 8) | p[1];
362 if (error.e_data->length == 2)
363 str2data(result_string, "server only sent error code");
365 krb5_data_copy (result_string,
367 error.e_data->length - 2);
368 free_KRB_ERROR(&error);
372 if (pkt_len != len) {
373 str2data (result_string, "client: wrong len in reply");
374 *result_code = KRB5_KPASSWD_MALFORMED;
377 if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW) {
378 str2data (result_string,
379 "client: wrong version number (%d)", pkt_ver);
380 *result_code = KRB5_KPASSWD_MALFORMED;
384 ap_rep_data.data = reply + 6;
385 ap_rep_data.length = (reply[4] << 8) | (reply[5]);
387 if (reply + len < (u_char *)ap_rep_data.data + ap_rep_data.length) {
388 str2data (result_string, "client: wrong AP len in reply");
389 *result_code = KRB5_KPASSWD_MALFORMED;
393 if (ap_rep_data.length) {
394 krb5_ap_rep_enc_part *ap_rep;
398 priv_data.data = (u_char*)ap_rep_data.data + ap_rep_data.length;
399 priv_data.length = len - ap_rep_data.length - 6;
401 ret = krb5_rd_rep (context,
408 krb5_free_ap_rep_enc_part (context, ap_rep);
410 ret = krb5_rd_priv (context,
416 krb5_data_free (result_code_string);
420 if (result_code_string->length < 2) {
421 *result_code = KRB5_KPASSWD_MALFORMED;
422 str2data (result_string,
423 "client: bad length in result");
427 p = result_code_string->data;
429 *result_code = (p[0] << 8) | p[1];
430 krb5_data_copy (result_string,
431 (unsigned char*)result_code_string->data + 2,
432 result_code_string->length - 2);
439 ret = decode_KRB_ERROR(reply + 6, len - 6, &error, &size);
443 if (error.e_data->length < 2) {
444 krb5_warnx (context, "too short e_data to print anything usable");
448 p = error.e_data->data;
449 *result_code = (p[0] << 8) | p[1];
450 krb5_data_copy (result_string,
452 error.e_data->length - 2);
459 * change the password using the credentials in `creds' (for the
460 * principal indicated in them) to `newpw', storing the result of
461 * the operation in `result_*' and an error code or 0.
464 typedef krb5_error_code (*kpwd_send_request) (krb5_context,
472 typedef krb5_error_code (*kpwd_process_reply) (krb5_context,
481 static struct kpwd_proc {
484 #define SUPPORT_TCP 1
485 #define SUPPORT_UDP 2
486 kpwd_send_request send_req;
487 kpwd_process_reply process_rep;
491 SUPPORT_TCP|SUPPORT_UDP,
508 static krb5_error_code
509 change_password_loop (krb5_context context,
511 krb5_principal targprinc,
514 krb5_data *result_code_string,
515 krb5_data *result_string,
516 struct kpwd_proc *proc)
519 krb5_auth_context auth_context = NULL;
520 krb5_krbhst_handle handle = NULL;
521 krb5_krbhst_info *hi;
528 realm = targprinc->realm;
530 realm = creds->client->realm;
532 ret = krb5_auth_con_init (context, &auth_context);
536 krb5_auth_con_setflags (context, auth_context,
537 KRB5_AUTH_CONTEXT_DO_SEQUENCE);
539 ret = krb5_krbhst_init (context, realm, KRB5_KRBHST_CHANGEPW, &handle);
543 while (!done && (ret = krb5_krbhst_next(context, handle, &hi)) == 0) {
544 struct addrinfo *ai, *a;
548 case KRB5_KRBHST_UDP:
549 if ((proc->flags & SUPPORT_UDP) == 0)
553 case KRB5_KRBHST_TCP:
554 if ((proc->flags & SUPPORT_TCP) == 0)
562 ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
566 for (a = ai; !done && a != NULL; a = a->ai_next) {
569 sock = socket (a->ai_family, a->ai_socktype | SOCK_CLOEXEC, a->ai_protocol);
574 ret = connect(sock, a->ai_addr, a->ai_addrlen);
580 ret = krb5_auth_con_genaddrs (context, auth_context, sock,
581 KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR);
587 for (i = 0; !done && i < 5; ++i) {
594 ret = (*proc->send_req) (context,
608 if (sock >= FD_SETSIZE) {
610 krb5_set_error_message(context, ret,
611 "fd %d too large", sock);
617 FD_SET(sock, &fdset);
619 tv.tv_sec = 1 + (1 << i);
621 ret = select (sock + 1, &fdset, NULL, NULL, &tv);
622 if (ret < 0 && errno != EINTR) {
627 ret = (*proc->process_rep) (context,
637 else if (i > 0 && ret == KRB5KRB_AP_ERR_MUT_FAIL)
640 ret = KRB5_KDC_UNREACH;
648 krb5_krbhst_free (context, handle);
649 krb5_auth_con_free (context, auth_context);
651 if (ret == KRB5_KDC_UNREACH) {
652 krb5_set_error_message(context,
654 N_("Unable to reach any changepw server "
655 " in realm %s", "realm"), realm);
656 *result_code = KRB5_KPASSWD_HARDERROR;
661 #ifndef HEIMDAL_SMALLER
663 static struct kpwd_proc *
664 find_chpw_proto(const char *name)
667 for (p = procs; p->name != NULL; p++) {
668 if (strcmp(p->name, name) == 0)
675 * krb5_change_password() is deprecated, use krb5_set_password().
677 * @param context a Keberos context
681 * @param result_code_string
682 * @param result_string
684 * @return On sucess password is changed.
686 * @ingroup @krb5_deprecated
689 krb5_error_code KRB5_LIB_FUNCTION
690 krb5_change_password (krb5_context context,
694 krb5_data *result_code_string,
695 krb5_data *result_string)
696 __attribute__((deprecated))
698 struct kpwd_proc *p = find_chpw_proto("change password");
700 *result_code = KRB5_KPASSWD_MALFORMED;
701 result_code_string->data = result_string->data = NULL;
702 result_code_string->length = result_string->length = 0;
705 return KRB5_KPASSWD_MALFORMED;
707 return change_password_loop(context, creds, NULL, newpw,
708 result_code, result_code_string,
711 #endif /* HEIMDAL_SMALLER */
714 * Change passwrod using creds.
716 * @param context a Keberos context
717 * @param creds The initial kadmin/passwd for the principal or an admin principal
718 * @param newpw The new password to set
719 * @param targprinc if unset, the default principal is used.
720 * @param result_code Result code, KRB5_KPASSWD_SUCCESS is when password is changed.
721 * @param result_code_string binary message from the server, contains
722 * at least the result_code.
723 * @param result_string A message from the kpasswd service or the
724 * library in human printable form. The string is NUL terminated.
726 * @return On sucess and *result_code is KRB5_KPASSWD_SUCCESS, the password is changed.
731 krb5_error_code KRB5_LIB_FUNCTION
732 krb5_set_password(krb5_context context,
735 krb5_principal targprinc,
737 krb5_data *result_code_string,
738 krb5_data *result_string)
740 krb5_principal principal = NULL;
741 krb5_error_code ret = 0;
744 *result_code = KRB5_KPASSWD_MALFORMED;
745 krb5_data_zero(result_code_string);
746 krb5_data_zero(result_string);
748 if (targprinc == NULL) {
749 ret = krb5_get_default_principal(context, &principal);
753 principal = targprinc;
755 for (i = 0; procs[i].name != NULL; i++) {
757 ret = change_password_loop(context, creds, principal, newpw,
758 result_code, result_code_string,
761 if (ret == 0 && *result_code == 0)
765 if (targprinc == NULL)
766 krb5_free_principal(context, principal);
770 #ifndef HEIMDAL_SMALLER
776 krb5_error_code KRB5_LIB_FUNCTION
777 krb5_set_password_using_ccache(krb5_context context,
780 krb5_principal targprinc,
782 krb5_data *result_code_string,
783 krb5_data *result_string)
785 krb5_creds creds, *credsp;
787 krb5_principal principal = NULL;
789 *result_code = KRB5_KPASSWD_MALFORMED;
790 result_code_string->data = result_string->data = NULL;
791 result_code_string->length = result_string->length = 0;
793 memset(&creds, 0, sizeof(creds));
795 if (targprinc == NULL) {
796 ret = krb5_cc_get_principal(context, ccache, &principal);
800 principal = targprinc;
802 ret = krb5_make_principal(context, &creds.server,
803 krb5_principal_get_realm(context, principal),
804 "kadmin", "changepw", NULL);
808 ret = krb5_cc_get_principal(context, ccache, &creds.client);
810 krb5_free_principal(context, creds.server);
814 ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
815 krb5_free_principal(context, creds.server);
816 krb5_free_principal(context, creds.client);
820 ret = krb5_set_password(context,
828 krb5_free_creds(context, credsp);
832 if (targprinc == NULL)
833 krb5_free_principal(context, principal);
837 #endif /* !HEIMDAL_SMALLER */
843 const char* KRB5_LIB_FUNCTION
844 krb5_passwd_result_to_string (krb5_context context,
847 static const char *strings[] = {
855 "Initial flag needed"
858 if (result < 0 || result > KRB5_KPASSWD_INITIAL_FLAG_NEEDED)
859 return "unknown result code";
861 return strings[result];