1/* 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) 6 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 3 of the License, or 10 (at your option) any later version. 11 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. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. 19*/ 20 21#include "includes.h" 22#include "smb_krb5.h" 23 24#ifdef HAVE_KRB5 25 26#define DEFAULT_KPASSWD_PORT 464 27 28#define KRB5_KPASSWD_VERS_CHANGEPW 1 29 30#define KRB5_KPASSWD_VERS_SETPW 0xff80 31#define KRB5_KPASSWD_VERS_SETPW_ALT 2 32 33#define KRB5_KPASSWD_SUCCESS 0 34#define KRB5_KPASSWD_MALFORMED 1 35#define KRB5_KPASSWD_HARDERROR 2 36#define KRB5_KPASSWD_AUTHERROR 3 37#define KRB5_KPASSWD_SOFTERROR 4 38#define KRB5_KPASSWD_ACCESSDENIED 5 39#define KRB5_KPASSWD_BAD_VERSION 6 40#define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7 41 42/* Those are defined by kerberos-set-passwd-02.txt and are probably 43 * not supported by M$ implementation */ 44#define KRB5_KPASSWD_POLICY_REJECT 8 45#define KRB5_KPASSWD_BAD_PRINCIPAL 9 46#define KRB5_KPASSWD_ETYPE_NOSUPP 10 47 48/* 49 * we've got to be able to distinguish KRB_ERRORs from other 50 * requests - valid response for CHPW v2 replies. 51 */ 52 53#define krb5_is_krb_error(packet) \ 54 ( packet && packet->length && (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e)) 55 56/* This implements kerberos password change protocol as specified in 57 * kerb-chg-password-02.txt and kerberos-set-passwd-02.txt 58 * as well as microsoft version of the protocol 59 * as specified in kerberos-set-passwd-00.txt 60 */ 61static DATA_BLOB encode_krb5_setpw(const char *principal, const char *password) 62{ 63 char* princ_part1 = NULL; 64 char* princ_part2 = NULL; 65 char* realm = NULL; 66 char* c; 67 char* princ; 68 69 ASN1_DATA *req; 70 DATA_BLOB ret; 71 72 73 princ = SMB_STRDUP(principal); 74 75 if ((c = strchr_m(princ, '/')) == NULL) { 76 c = princ; 77 } else { 78 *c = '\0'; 79 c++; 80 princ_part1 = princ; 81 } 82 83 princ_part2 = c; 84 85 if ((c = strchr_m(c, '@')) != NULL) { 86 *c = '\0'; 87 c++; 88 realm = c; 89 } else { 90 /* We must have a realm component. */ 91 return data_blob_null; 92 } 93 94 req = asn1_init(talloc_tos()); 95 if (req == NULL) { 96 return data_blob_null; 97 } 98 99 asn1_push_tag(req, ASN1_SEQUENCE(0)); 100 asn1_push_tag(req, ASN1_CONTEXT(0)); 101 asn1_write_OctetString(req, password, strlen(password)); 102 asn1_pop_tag(req); 103 104 asn1_push_tag(req, ASN1_CONTEXT(1)); 105 asn1_push_tag(req, ASN1_SEQUENCE(0)); 106 107 asn1_push_tag(req, ASN1_CONTEXT(0)); 108 asn1_write_Integer(req, 1); 109 asn1_pop_tag(req); 110 111 asn1_push_tag(req, ASN1_CONTEXT(1)); 112 asn1_push_tag(req, ASN1_SEQUENCE(0)); 113 114 if (princ_part1) { 115 asn1_write_GeneralString(req, princ_part1); 116 } 117 118 asn1_write_GeneralString(req, princ_part2); 119 asn1_pop_tag(req); 120 asn1_pop_tag(req); 121 asn1_pop_tag(req); 122 asn1_pop_tag(req); 123 124 asn1_push_tag(req, ASN1_CONTEXT(2)); 125 asn1_write_GeneralString(req, realm); 126 asn1_pop_tag(req); 127 asn1_pop_tag(req); 128 129 ret = data_blob(req->data, req->length); 130 asn1_free(req); 131 132 free(princ); 133 134 return ret; 135} 136 137static krb5_error_code build_kpasswd_request(uint16 pversion, 138 krb5_context context, 139 krb5_auth_context auth_context, 140 krb5_data *ap_req, 141 const char *princ, 142 const char *passwd, 143 bool use_tcp, 144 krb5_data *packet) 145{ 146 krb5_error_code ret; 147 krb5_data cipherpw; 148 krb5_data encoded_setpw; 149 krb5_replay_data replay; 150 char *p, *msg_start; 151 DATA_BLOB setpw; 152 unsigned int msg_length; 153 154 ret = krb5_auth_con_setflags(context, 155 auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE); 156 if (ret) { 157 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n", 158 error_message(ret))); 159 return ret; 160 } 161 162 /* handle protocol differences in chpw and setpw */ 163 if (pversion == KRB5_KPASSWD_VERS_CHANGEPW) 164 setpw = data_blob(passwd, strlen(passwd)); 165 else if (pversion == KRB5_KPASSWD_VERS_SETPW || 166 pversion == KRB5_KPASSWD_VERS_SETPW_ALT) 167 setpw = encode_krb5_setpw(princ, passwd); 168 else 169 return EINVAL; 170 171 if (setpw.data == NULL || setpw.length == 0) { 172 return EINVAL; 173 } 174 175 encoded_setpw.data = (char *)setpw.data; 176 encoded_setpw.length = setpw.length; 177 178 ret = krb5_mk_priv(context, auth_context, 179 &encoded_setpw, &cipherpw, &replay); 180 181 data_blob_free(&setpw); /*from 'encode_krb5_setpw(...)' */ 182 183 if (ret) { 184 DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret))); 185 return ret; 186 } 187 188 packet->data = (char *)SMB_MALLOC(ap_req->length + cipherpw.length + (use_tcp ? 10 : 6 )); 189 if (!packet->data) 190 return -1; 191 192 193 194 /* see the RFC for details */ 195 196 msg_start = p = ((char *)packet->data) + (use_tcp ? 4 : 0); 197 p += 2; 198 RSSVAL(p, 0, pversion); 199 p += 2; 200 RSSVAL(p, 0, ap_req->length); 201 p += 2; 202 memcpy(p, ap_req->data, ap_req->length); 203 p += ap_req->length; 204 memcpy(p, cipherpw.data, cipherpw.length); 205 p += cipherpw.length; 206 packet->length = PTR_DIFF(p,packet->data); 207 msg_length = PTR_DIFF(p,msg_start); 208 209 if (use_tcp) { 210 RSIVAL(packet->data, 0, msg_length); 211 } 212 RSSVAL(msg_start, 0, msg_length); 213 214 free(cipherpw.data); /* from 'krb5_mk_priv(...)' */ 215 216 return 0; 217} 218 219static const struct kpasswd_errors { 220 int result_code; 221 const char *error_string; 222} kpasswd_errors[] = { 223 {KRB5_KPASSWD_MALFORMED, "Malformed request error"}, 224 {KRB5_KPASSWD_HARDERROR, "Server error"}, 225 {KRB5_KPASSWD_AUTHERROR, "Authentication error"}, 226 {KRB5_KPASSWD_SOFTERROR, "Password change rejected"}, 227 {KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"}, 228 {KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"}, 229 {KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"}, 230 {KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"}, 231 {KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"}, 232 {KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"}, 233 {0, NULL} 234}; 235 236static krb5_error_code setpw_result_code_string(krb5_context context, 237 int result_code, 238 const char **code_string) 239{ 240 unsigned int idx = 0; 241 242 while (kpasswd_errors[idx].error_string != NULL) { 243 if (kpasswd_errors[idx].result_code == 244 result_code) { 245 *code_string = kpasswd_errors[idx].error_string; 246 return 0; 247 } 248 idx++; 249 } 250 *code_string = "Password change failed"; 251 return (0); 252} 253 254 krb5_error_code kpasswd_err_to_krb5_err(krb5_error_code res_code) 255{ 256 switch(res_code) { 257 case KRB5_KPASSWD_ACCESSDENIED: 258 return KRB5KDC_ERR_BADOPTION; 259 case KRB5_KPASSWD_INITIAL_FLAG_NEEDED: 260 return KRB5KDC_ERR_BADOPTION; 261 /* return KV5M_ALT_METHOD; MIT-only define */ 262 case KRB5_KPASSWD_ETYPE_NOSUPP: 263 return KRB5KDC_ERR_ETYPE_NOSUPP; 264 case KRB5_KPASSWD_BAD_PRINCIPAL: 265 return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN; 266 case KRB5_KPASSWD_POLICY_REJECT: 267 case KRB5_KPASSWD_SOFTERROR: 268 return KRB5KDC_ERR_POLICY; 269 default: 270 return KRB5KRB_ERR_GENERIC; 271 } 272} 273static krb5_error_code parse_setpw_reply(krb5_context context, 274 bool use_tcp, 275 krb5_auth_context auth_context, 276 krb5_data *packet) 277{ 278 krb5_data ap_rep; 279 char *p; 280 int vnum, ret, res_code; 281 krb5_data cipherresult; 282 krb5_data clearresult; 283 krb5_ap_rep_enc_part *ap_rep_enc; 284 krb5_replay_data replay; 285 unsigned int msg_length = packet->length; 286 287 288 if (packet->length < (use_tcp ? 8 : 4)) { 289 return KRB5KRB_AP_ERR_MODIFIED; 290 } 291 292 p = (char *)packet->data; 293 /* 294 ** see if it is an error 295 */ 296 if (krb5_is_krb_error(packet)) { 297 298 ret = handle_krberror_packet(context, packet); 299 if (ret) { 300 return ret; 301 } 302 } 303 304 305 /* tcp... */ 306 if (use_tcp) { 307 msg_length -= 4; 308 if (RIVAL(p, 0) != msg_length) { 309 DEBUG(1,("Bad TCP packet length (%d/%d) from kpasswd server\n", 310 RIVAL(p, 0), msg_length)); 311 return KRB5KRB_AP_ERR_MODIFIED; 312 } 313 314 p += 4; 315 } 316 317 if (RSVAL(p, 0) != msg_length) { 318 DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n", 319 RSVAL(p, 0), msg_length)); 320 return KRB5KRB_AP_ERR_MODIFIED; 321 } 322 323 p += 2; 324 325 vnum = RSVAL(p, 0); p += 2; 326 327 /* FIXME: According to standard there is only one type of reply */ 328 if (vnum != KRB5_KPASSWD_VERS_SETPW && 329 vnum != KRB5_KPASSWD_VERS_SETPW_ALT && 330 vnum != KRB5_KPASSWD_VERS_CHANGEPW) { 331 DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum)); 332 return KRB5KDC_ERR_BAD_PVNO; 333 } 334 335 ap_rep.length = RSVAL(p, 0); p += 2; 336 337 if (p + ap_rep.length >= (char *)packet->data + packet->length) { 338 DEBUG(1,("ptr beyond end of packet from kpasswd server\n")); 339 return KRB5KRB_AP_ERR_MODIFIED; 340 } 341 342 if (ap_rep.length == 0) { 343 DEBUG(1,("got unencrypted setpw result?!\n")); 344 return KRB5KRB_AP_ERR_MODIFIED; 345 } 346 347 /* verify ap_rep */ 348 ap_rep.data = p; 349 p += ap_rep.length; 350 351 ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc); 352 if (ret) { 353 DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret))); 354 return KRB5KRB_AP_ERR_MODIFIED; 355 } 356 357 krb5_free_ap_rep_enc_part(context, ap_rep_enc); 358 359 cipherresult.data = p; 360 cipherresult.length = ((char *)packet->data + packet->length) - p; 361 362 ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult, 363 &replay); 364 if (ret) { 365 DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret))); 366 return KRB5KRB_AP_ERR_MODIFIED; 367 } 368 369 if (clearresult.length < 2) { 370 free(clearresult.data); 371 ret = KRB5KRB_AP_ERR_MODIFIED; 372 return KRB5KRB_AP_ERR_MODIFIED; 373 } 374 375 p = (char *)clearresult.data; 376 377 res_code = RSVAL(p, 0); 378 379 free(clearresult.data); 380 381 if ((res_code < KRB5_KPASSWD_SUCCESS) || 382 (res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) { 383 return KRB5KRB_AP_ERR_MODIFIED; 384 } 385 386 if (res_code == KRB5_KPASSWD_SUCCESS) { 387 return 0; 388 } else { 389 const char *errstr; 390 setpw_result_code_string(context, res_code, &errstr); 391 DEBUG(1, ("Error changing password: %s (%d)\n", errstr, res_code)); 392 393 return kpasswd_err_to_krb5_err(res_code); 394 } 395} 396 397static ADS_STATUS do_krb5_kpasswd_request(krb5_context context, 398 const char *kdc_host, 399 uint16 pversion, 400 krb5_creds *credsp, 401 const char *princ, 402 const char *newpw) 403{ 404 krb5_auth_context auth_context = NULL; 405 krb5_data ap_req, chpw_req, chpw_rep; 406 int ret, sock; 407 socklen_t addr_len; 408 struct sockaddr_storage remote_addr, local_addr; 409 struct sockaddr_storage addr; 410 krb5_address local_kaddr, remote_kaddr; 411 bool use_tcp = False; 412 413 414 if (!interpret_string_addr(&addr, kdc_host, 0)) { 415 } 416 417 ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY, 418 NULL, credsp, &ap_req); 419 if (ret) { 420 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret))); 421 return ADS_ERROR_KRB5(ret); 422 } 423 424 do { 425 426 if (!use_tcp) { 427 428 sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT); 429 if (sock == -1) { 430 int rc = errno; 431 SAFE_FREE(ap_req.data); 432 krb5_auth_con_free(context, auth_context); 433 DEBUG(1,("failed to open kpasswd socket to %s " 434 "(%s)\n", kdc_host, strerror(errno))); 435 return ADS_ERROR_SYSTEM(rc); 436 } 437 } else { 438 NTSTATUS status; 439 status = open_socket_out(&addr, DEFAULT_KPASSWD_PORT, 440 LONG_CONNECT_TIMEOUT, &sock); 441 if (!NT_STATUS_IS_OK(status)) { 442 SAFE_FREE(ap_req.data); 443 krb5_auth_con_free(context, auth_context); 444 DEBUG(1,("failed to open kpasswd socket to %s " 445 "(%s)\n", kdc_host, 446 nt_errstr(status))); 447 return ADS_ERROR_NT(status); 448 } 449 } 450 451 addr_len = sizeof(remote_addr); 452 if (getpeername(sock, (struct sockaddr *)&remote_addr, &addr_len) != 0) { 453 close(sock); 454 SAFE_FREE(ap_req.data); 455 krb5_auth_con_free(context, auth_context); 456 DEBUG(1,("getpeername() failed (%s)\n", error_message(errno))); 457 return ADS_ERROR_SYSTEM(errno); 458 } 459 addr_len = sizeof(local_addr); 460 if (getsockname(sock, (struct sockaddr *)&local_addr, &addr_len) != 0) { 461 close(sock); 462 SAFE_FREE(ap_req.data); 463 krb5_auth_con_free(context, auth_context); 464 DEBUG(1,("getsockname() failed (%s)\n", error_message(errno))); 465 return ADS_ERROR_SYSTEM(errno); 466 } 467 if (!setup_kaddr(&remote_kaddr, &remote_addr) || 468 !setup_kaddr(&local_kaddr, &local_addr)) { 469 DEBUG(1,("do_krb5_kpasswd_request: " 470 "Failed to setup addresses.\n")); 471 close(sock); 472 SAFE_FREE(ap_req.data); 473 krb5_auth_con_free(context, auth_context); 474 errno = EINVAL; 475 return ADS_ERROR_SYSTEM(EINVAL); 476 } 477 478 ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL); 479 if (ret) { 480 close(sock); 481 SAFE_FREE(ap_req.data); 482 krb5_auth_con_free(context, auth_context); 483 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret))); 484 return ADS_ERROR_KRB5(ret); 485 } 486 487 ret = build_kpasswd_request(pversion, context, auth_context, &ap_req, 488 princ, newpw, use_tcp, &chpw_req); 489 if (ret) { 490 close(sock); 491 SAFE_FREE(ap_req.data); 492 krb5_auth_con_free(context, auth_context); 493 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret))); 494 return ADS_ERROR_KRB5(ret); 495 } 496 497 ret = write(sock, chpw_req.data, chpw_req.length); 498 499 if (ret != chpw_req.length) { 500 close(sock); 501 SAFE_FREE(chpw_req.data); 502 SAFE_FREE(ap_req.data); 503 krb5_auth_con_free(context, auth_context); 504 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno))); 505 return ADS_ERROR_SYSTEM(errno); 506 } 507 508 SAFE_FREE(chpw_req.data); 509 510 chpw_rep.length = 1500; 511 chpw_rep.data = (char *) SMB_MALLOC(chpw_rep.length); 512 if (!chpw_rep.data) { 513 close(sock); 514 SAFE_FREE(ap_req.data); 515 krb5_auth_con_free(context, auth_context); 516 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno))); 517 errno = ENOMEM; 518 return ADS_ERROR_SYSTEM(errno); 519 } 520 521 ret = read(sock, chpw_rep.data, chpw_rep.length); 522 if (ret < 0) { 523 close(sock); 524 SAFE_FREE(chpw_rep.data); 525 SAFE_FREE(ap_req.data); 526 krb5_auth_con_free(context, auth_context); 527 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno))); 528 return ADS_ERROR_SYSTEM(errno); 529 } 530 531 close(sock); 532 chpw_rep.length = ret; 533 534 ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr); 535 if (ret) { 536 SAFE_FREE(chpw_rep.data); 537 SAFE_FREE(ap_req.data); 538 krb5_auth_con_free(context, auth_context); 539 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n", 540 error_message(ret))); 541 return ADS_ERROR_KRB5(ret); 542 } 543 544 ret = parse_setpw_reply(context, use_tcp, auth_context, &chpw_rep); 545 SAFE_FREE(chpw_rep.data); 546 547 if (ret) { 548 549 if (ret == KRB5KRB_ERR_RESPONSE_TOO_BIG && !use_tcp) { 550 DEBUG(5, ("Trying setpw with TCP!!!\n")); 551 use_tcp = True; 552 continue; 553 } 554 555 SAFE_FREE(ap_req.data); 556 krb5_auth_con_free(context, auth_context); 557 DEBUG(1,("parse_setpw_reply failed (%s)\n", 558 error_message(ret))); 559 return ADS_ERROR_KRB5(ret); 560 } 561 562 SAFE_FREE(ap_req.data); 563 krb5_auth_con_free(context, auth_context); 564 } while ( ret ); 565 566 return ADS_SUCCESS; 567} 568 569ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ, 570 const char *newpw, int time_offset) 571{ 572 573 ADS_STATUS aret; 574 krb5_error_code ret = 0; 575 krb5_context context = NULL; 576 krb5_principal principal = NULL; 577 char *princ_name = NULL; 578 char *realm = NULL; 579 krb5_creds creds, *credsp = NULL; 580#if KRB5_PRINC_REALM_RETURNS_REALM 581 krb5_realm orig_realm; 582#else 583 krb5_data orig_realm; 584#endif 585 krb5_ccache ccache = NULL; 586 587 ZERO_STRUCT(creds); 588 589 initialize_krb5_error_table(); 590 ret = krb5_init_context(&context); 591 if (ret) { 592 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret))); 593 return ADS_ERROR_KRB5(ret); 594 } 595 596 if (time_offset != 0) { 597 krb5_set_real_time(context, time(NULL) + time_offset, 0); 598 } 599 600 ret = krb5_cc_default(context, &ccache); 601 if (ret) { 602 krb5_free_context(context); 603 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret))); 604 return ADS_ERROR_KRB5(ret); 605 } 606 607 realm = strchr_m(princ, '@'); 608 if (!realm) { 609 krb5_cc_close(context, ccache); 610 krb5_free_context(context); 611 DEBUG(1,("Failed to get realm\n")); 612 return ADS_ERROR_KRB5(-1); 613 } 614 realm++; 615 616 if (asprintf(&princ_name, "kadmin/changepw@%s", realm) == -1) { 617 krb5_cc_close(context, ccache); 618 krb5_free_context(context); 619 DEBUG(1,("asprintf failed\n")); 620 return ADS_ERROR_NT(NT_STATUS_NO_MEMORY); 621 } 622 623 ret = smb_krb5_parse_name(context, princ_name, &creds.server); 624 if (ret) { 625 krb5_cc_close(context, ccache); 626 krb5_free_context(context); 627 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret))); 628 return ADS_ERROR_KRB5(ret); 629 } 630 631 /* parse the principal we got as a function argument */ 632 ret = smb_krb5_parse_name(context, princ, &principal); 633 if (ret) { 634 krb5_cc_close(context, ccache); 635 krb5_free_principal(context, creds.server); 636 krb5_free_context(context); 637 DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret))); 638 free(princ_name); 639 return ADS_ERROR_KRB5(ret); 640 } 641 642 free(princ_name); 643 644 /* The creds.server principal takes ownership of this memory. 645 Remember to set back to original value before freeing. */ 646 orig_realm = *krb5_princ_realm(context, creds.server); 647 krb5_princ_set_realm(context, creds.server, krb5_princ_realm(context, principal)); 648 649 ret = krb5_cc_get_principal(context, ccache, &creds.client); 650 if (ret) { 651 krb5_cc_close(context, ccache); 652 krb5_princ_set_realm(context, creds.server, &orig_realm); 653 krb5_free_principal(context, creds.server); 654 krb5_free_principal(context, principal); 655 krb5_free_context(context); 656 DEBUG(1,("Failed to get principal from ccache (%s)\n", 657 error_message(ret))); 658 return ADS_ERROR_KRB5(ret); 659 } 660 661 ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp); 662 if (ret) { 663 krb5_cc_close(context, ccache); 664 krb5_free_principal(context, creds.client); 665 krb5_princ_set_realm(context, creds.server, &orig_realm); 666 krb5_free_principal(context, creds.server); 667 krb5_free_principal(context, principal); 668 krb5_free_context(context); 669 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret))); 670 return ADS_ERROR_KRB5(ret); 671 } 672 673 /* we might have to call krb5_free_creds(...) from now on ... */ 674 675 aret = do_krb5_kpasswd_request(context, kdc_host, 676 KRB5_KPASSWD_VERS_SETPW, 677 credsp, princ, newpw); 678 679 krb5_free_creds(context, credsp); 680 krb5_free_principal(context, creds.client); 681 krb5_princ_set_realm(context, creds.server, &orig_realm); 682 krb5_free_principal(context, creds.server); 683 krb5_free_principal(context, principal); 684 krb5_cc_close(context, ccache); 685 krb5_free_context(context); 686 687 return aret; 688} 689 690/* 691 we use a prompter to avoid a crash bug in the kerberos libs when 692 dealing with empty passwords 693 this prompter is just a string copy ... 694*/ 695static krb5_error_code 696kerb_prompter(krb5_context ctx, void *data, 697 const char *name, 698 const char *banner, 699 int num_prompts, 700 krb5_prompt prompts[]) 701{ 702 if (num_prompts == 0) return 0; 703 704 memset(prompts[0].reply->data, 0, prompts[0].reply->length); 705 if (prompts[0].reply->length > 0) { 706 if (data) { 707 strncpy((char *)prompts[0].reply->data, 708 (const char *)data, 709 prompts[0].reply->length-1); 710 prompts[0].reply->length = strlen((const char *)prompts[0].reply->data); 711 } else { 712 prompts[0].reply->length = 0; 713 } 714 } 715 return 0; 716} 717 718static ADS_STATUS ads_krb5_chg_password(const char *kdc_host, 719 const char *principal, 720 const char *oldpw, 721 const char *newpw, 722 int time_offset) 723{ 724 ADS_STATUS aret; 725 krb5_error_code ret; 726 krb5_context context = NULL; 727 krb5_principal princ; 728 krb5_get_init_creds_opt opts; 729 krb5_creds creds; 730 char *chpw_princ = NULL, *password; 731 732 initialize_krb5_error_table(); 733 ret = krb5_init_context(&context); 734 if (ret) { 735 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret))); 736 return ADS_ERROR_KRB5(ret); 737 } 738 739 if ((ret = smb_krb5_parse_name(context, principal, 740 &princ))) { 741 krb5_free_context(context); 742 DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret))); 743 return ADS_ERROR_KRB5(ret); 744 } 745 746 krb5_get_init_creds_opt_init(&opts); 747 krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60); 748 krb5_get_init_creds_opt_set_renew_life(&opts, 0); 749 krb5_get_init_creds_opt_set_forwardable(&opts, 0); 750 krb5_get_init_creds_opt_set_proxiable(&opts, 0); 751 752 /* We have to obtain an INITIAL changepw ticket for changing password */ 753 if (asprintf(&chpw_princ, "kadmin/changepw@%s", 754 (char *) krb5_princ_realm(context, princ)) == -1) { 755 krb5_free_context(context); 756 DEBUG(1,("ads_krb5_chg_password: asprintf fail\n")); 757 return ADS_ERROR_NT(NT_STATUS_NO_MEMORY); 758 } 759 760 password = SMB_STRDUP(oldpw); 761 ret = krb5_get_init_creds_password(context, &creds, princ, password, 762 kerb_prompter, NULL, 763 0, chpw_princ, &opts); 764 SAFE_FREE(chpw_princ); 765 SAFE_FREE(password); 766 767 if (ret) { 768 if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) 769 DEBUG(1,("Password incorrect while getting initial ticket")); 770 else 771 DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret))); 772 773 krb5_free_principal(context, princ); 774 krb5_free_context(context); 775 return ADS_ERROR_KRB5(ret); 776 } 777 778 aret = do_krb5_kpasswd_request(context, kdc_host, 779 KRB5_KPASSWD_VERS_CHANGEPW, 780 &creds, principal, newpw); 781 782 krb5_free_principal(context, princ); 783 krb5_free_context(context); 784 785 return aret; 786} 787 788 789ADS_STATUS kerberos_set_password(const char *kpasswd_server, 790 const char *auth_principal, const char *auth_password, 791 const char *target_principal, const char *new_password, 792 int time_offset) 793{ 794 int ret; 795 796 if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL))) { 797 DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret))); 798 return ADS_ERROR_KRB5(ret); 799 } 800 801 if (!strcmp(auth_principal, target_principal)) 802 return ads_krb5_chg_password(kpasswd_server, target_principal, 803 auth_password, new_password, time_offset); 804 else 805 return ads_krb5_set_password(kpasswd_server, target_principal, 806 new_password, time_offset); 807} 808 809 810/** 811 * Set the machine account password 812 * @param ads connection to ads server 813 * @param hostname machine whose password is being set 814 * @param password new password 815 * @return status of password change 816 **/ 817ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads, 818 const char *machine_account, 819 const char *password) 820{ 821 ADS_STATUS status; 822 char *principal = NULL; 823 824 /* 825 we need to use the '$' form of the name here (the machine account name), 826 as otherwise the server might end up setting the password for a user 827 instead 828 */ 829 if (asprintf(&principal, "%s@%s", machine_account, ads->config.realm) < 0) { 830 return ADS_ERROR_NT(NT_STATUS_NO_MEMORY); 831 } 832 833 status = ads_krb5_set_password(ads->auth.kdc_server, principal, 834 password, ads->auth.time_offset); 835 836 SAFE_FREE(principal); 837 return status; 838} 839#endif 840