source3/libads/krb5_setpw.c

   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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #ifdef HAVE_KRB5
  25
  26 #define DEFAULT_KPASSWD_PORT    464
  27 #define KRB5_KPASSWD_VERS_CHANGEPW              1
  28 #define KRB5_KPASSWD_VERS_SETPW                 0xff80
  29 #define KRB5_KPASSWD_VERS_SETPW_ALT             2
  30 #define KRB5_KPASSWD_ACCESSDENIED               5
  31 #define KRB5_KPASSWD_BAD_VERSION                6
  32 #define KRB5_KPASSWD_INITIAL_FLAG_NEEDED        7
  33
  34 /* Those are defined by kerberos-set-passwd-02.txt and are probably
  35  * not supported by M$ implementation */
  36 #define KRB5_KPASSWD_POLICY_REJECT              8
  37 #define KRB5_KPASSWD_BAD_PRINCIPAL              9
  38 #define KRB5_KPASSWD_ETYPE_NOSUPP               10
  39
  40 /* This implements kerberos password change protocol as specified in
  41  * kerb-chg-password-02.txt and kerberos-set-passwd-02.txt
  42  * as well as microsoft version of the protocol
  43  * as specified in kerberos-set-passwd-00.txt
  44  */
  45 static DATA_BLOB encode_krb5_setpw(const char *principal, const char *password)
  46 {
  47         char* princ_part1 = NULL;
  48         char* princ_part2 = NULL;
  49         char* realm = NULL;
  50         char* c;
  51         char* princ;
  52
  53         ASN1_DATA req;
  54         DATA_BLOB ret;
  55
  56
  57         princ = SMB_STRDUP(principal);
  58
  59         if ((c = strchr_m(princ, '/')) == NULL) {
  60             c = princ;
  61         } else {
  62             *c = '\0';
  63             c++;
  64             princ_part1 = princ;
  65         }
  66
  67         princ_part2 = c;
  68
  69         if ((c = strchr_m(c, '@')) != NULL) {
  70             *c = '\0';
  71             c++;
  72             realm = c;
  73         }
  74
  75         memset(&req, 0, sizeof(req));
  76
  77         asn1_push_tag(&req, ASN1_SEQUENCE(0));
  78         asn1_push_tag(&req, ASN1_CONTEXT(0));
  79         asn1_write_OctetString(&req, password, strlen(password));
  80         asn1_pop_tag(&req);
  81
  82         asn1_push_tag(&req, ASN1_CONTEXT(1));
  83         asn1_push_tag(&req, ASN1_SEQUENCE(0));
  84
  85         asn1_push_tag(&req, ASN1_CONTEXT(0));
  86         asn1_write_Integer(&req, 1);
  87         asn1_pop_tag(&req);
  88
  89         asn1_push_tag(&req, ASN1_CONTEXT(1));
  90         asn1_push_tag(&req, ASN1_SEQUENCE(0));
  91
  92         if (princ_part1)
  93             asn1_write_GeneralString(&req, princ_part1);
  94
  95         asn1_write_GeneralString(&req, princ_part2);
  96         asn1_pop_tag(&req);
  97         asn1_pop_tag(&req);
  98         asn1_pop_tag(&req);
  99         asn1_pop_tag(&req);
 100
 101         asn1_push_tag(&req, ASN1_CONTEXT(2));
 102         asn1_write_GeneralString(&req, realm);
 103         asn1_pop_tag(&req);
 104         asn1_pop_tag(&req);
 105
 106         ret = data_blob(req.data, req.length);
 107         asn1_free(&req);
 108
 109         free(princ);
 110
 111         return ret;
 112 }
 113
 114 static krb5_error_code build_kpasswd_request(uint16 pversion,
 115                                            krb5_context context,
 116                                            krb5_auth_context auth_context,
 117                                            krb5_data *ap_req,
 118                                            const char *princ,
 119                                            const char *passwd,
 120                                            krb5_data *packet)
 121 {
 122         krb5_error_code ret;
 123         krb5_data cipherpw;
 124         krb5_data encoded_setpw;
 125         krb5_replay_data replay;
 126         char *p;
 127         DATA_BLOB setpw;
 128
 129         ret = krb5_auth_con_setflags(context,
 130                                      auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 131         if (ret) {
 132                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 133                          error_message(ret)));
 134                 return ret;
 135         }
 136
 137         /* handle protocol differences in chpw and setpw */
 138         if (pversion  == KRB5_KPASSWD_VERS_CHANGEPW)
 139                 setpw = data_blob(passwd, strlen(passwd));
 140         else if (pversion == KRB5_KPASSWD_VERS_SETPW ||
 141                  pversion == KRB5_KPASSWD_VERS_SETPW_ALT)
 142                 setpw = encode_krb5_setpw(princ, passwd);
 143         else
 144                 return EINVAL;
 145
 146         encoded_setpw.data = (char *)setpw.data;
 147         encoded_setpw.length = setpw.length;
 148
 149         ret = krb5_mk_priv(context, auth_context,
 150                            &encoded_setpw, &cipherpw, &replay);
 151
 152         data_blob_free(&setpw);         /*from 'encode_krb5_setpw(...)' */
 153
 154         if (ret) {
 155                 DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret)));
 156                 return ret;
 157         }
 158
 159         packet->data = (char *)SMB_MALLOC(ap_req->length + cipherpw.length + 6);
 160         if (!packet->data)
 161                 return -1;
 162
 163         /* see the RFC for details */
 164         p = ((char *)packet->data) + 2;
 165         RSSVAL(p, 0, pversion);
 166         p += 2;
 167         RSSVAL(p, 0, ap_req->length);
 168         p += 2;
 169         memcpy(p, ap_req->data, ap_req->length);
 170         p += ap_req->length;
 171         memcpy(p, cipherpw.data, cipherpw.length);
 172         p += cipherpw.length;
 173         packet->length = PTR_DIFF(p,packet->data);
 174         RSSVAL(packet->data, 0, packet->length);
 175
 176         free(cipherpw.data);    /* from 'krb5_mk_priv(...)' */
 177
 178         return 0;
 179 }
 180
 181 static const struct kpasswd_errors {
 182         int result_code;
 183         const char *error_string;
 184 } kpasswd_errors[] = {
 185         {KRB5_KPASSWD_MALFORMED, "Malformed request error"},
 186         {KRB5_KPASSWD_HARDERROR, "Server error"},
 187         {KRB5_KPASSWD_AUTHERROR, "Authentication error"},
 188         {KRB5_KPASSWD_SOFTERROR, "Password change rejected"},
 189         {KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"},
 190         {KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"},
 191         {KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"},
 192         {KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"},
 193         {KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"},
 194         {KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"},
 195         {0, NULL}
 196 };
 197
 198 static krb5_error_code setpw_result_code_string(krb5_context context,
 199                                                 int result_code,
 200                                                 const char **code_string)
 201 {
 202         unsigned int idx = 0;
 203
 204         while (kpasswd_errors[idx].error_string != NULL) {
 205                 if (kpasswd_errors[idx].result_code ==
 206                     result_code) {
 207                         *code_string = kpasswd_errors[idx].error_string;
 208                         return 0;
 209                 }
 210                 idx++;
 211         }
 212         *code_string = "Password change failed";
 213         return (0);
 214 }
 215
 216 static krb5_error_code parse_setpw_reply(krb5_context context,
 217                                          krb5_auth_context auth_context,
 218                                          krb5_data *packet)
 219 {
 220         krb5_data ap_rep;
 221         char *p;
 222         int vnum, ret, res_code;
 223         krb5_data cipherresult;
 224         krb5_data clearresult;
 225         krb5_ap_rep_enc_part *ap_rep_enc;
 226         krb5_replay_data replay;
 227
 228         if (packet->length < 4) {
 229                 return KRB5KRB_AP_ERR_MODIFIED;
 230         }
 231
 232         p = packet->data;
 233
 234         if (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e) {
 235                 /* it's an error packet. We should parse it ... */
 236                 DEBUG(1,("Got error packet 0x%x from kpasswd server\n",
 237                          ((char *)packet->data)[0]));
 238                 return KRB5KRB_AP_ERR_MODIFIED;
 239         }
 240
 241         if (RSVAL(p, 0) != packet->length) {
 242                 DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
 243                          RSVAL(p, 0), packet->length));
 244                 return KRB5KRB_AP_ERR_MODIFIED;
 245         }
 246
 247         p += 2;
 248
 249         vnum = RSVAL(p, 0); p += 2;
 250
 251         /* FIXME: According to standard there is only one type of reply */
 252         if (vnum != KRB5_KPASSWD_VERS_SETPW &&
 253             vnum != KRB5_KPASSWD_VERS_SETPW_ALT &&
 254             vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
 255                 DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
 256                 return KRB5KDC_ERR_BAD_PVNO;
 257         }
 258
 259         ap_rep.length = RSVAL(p, 0); p += 2;
 260
 261         if (p + ap_rep.length >= (char *)packet->data + packet->length) {
 262                 DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
 263                 return KRB5KRB_AP_ERR_MODIFIED;
 264         }
 265
 266         if (ap_rep.length == 0) {
 267                 DEBUG(1,("got unencrypted setpw result?!\n"));
 268                 return KRB5KRB_AP_ERR_MODIFIED;
 269         }
 270
 271         /* verify ap_rep */
 272         ap_rep.data = p;
 273         p += ap_rep.length;
 274
 275         ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
 276         if (ret) {
 277                 DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret)));
 278                 return KRB5KRB_AP_ERR_MODIFIED;
 279         }
 280
 281         krb5_free_ap_rep_enc_part(context, ap_rep_enc);
 282
 283         cipherresult.data = p;
 284         cipherresult.length = ((char *)packet->data + packet->length) - p;
 285
 286         ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
 287                            &replay);
 288         if (ret) {
 289                 DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret)));
 290                 return KRB5KRB_AP_ERR_MODIFIED;
 291         }
 292
 293         if (clearresult.length < 2) {
 294                 free(clearresult.data);
 295                 ret = KRB5KRB_AP_ERR_MODIFIED;
 296                 return KRB5KRB_AP_ERR_MODIFIED;
 297         }
 298
 299         p = clearresult.data;
 300
 301         res_code = RSVAL(p, 0);
 302
 303         free(clearresult.data);
 304
 305         if ((res_code < KRB5_KPASSWD_SUCCESS) ||
 306             (res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) {
 307                 return KRB5KRB_AP_ERR_MODIFIED;
 308         }
 309
 310         if(res_code == KRB5_KPASSWD_SUCCESS)
 311                         return 0;
 312         else {
 313                 const char *errstr;
 314                 setpw_result_code_string(context, res_code, &errstr);
 315                 DEBUG(1, ("Error changing password: %s\n", errstr));
 316
 317                 switch(res_code) {
 318                         case KRB5_KPASSWD_ACCESSDENIED:
 319                                 return KRB5KDC_ERR_BADOPTION;
 320                                 break;
 321                         case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
 322                                 return KRB5KDC_ERR_BADOPTION;
 323                                 /* return KV5M_ALT_METHOD; MIT-only define */
 324                                 break;
 325                         case KRB5_KPASSWD_ETYPE_NOSUPP:
 326                                 return KRB5KDC_ERR_ETYPE_NOSUPP;
 327                                 break;
 328                         case KRB5_KPASSWD_BAD_PRINCIPAL:
 329                                 return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 330                                 break;
 331                         case KRB5_KPASSWD_POLICY_REJECT:
 332                                 return KRB5KDC_ERR_POLICY;
 333                                 break;
 334                         default:
 335                                 return KRB5KRB_ERR_GENERIC;
 336                                 break;
 337                 }
 338         }
 339 }
 340
 341 static ADS_STATUS do_krb5_kpasswd_request(krb5_context context,
 342                                           const char *kdc_host,
 343                                           uint16 pversion,
 344                                           krb5_creds *credsp,
 345                                           const char *princ,
 346                                           const char *newpw)
 347 {
 348         krb5_auth_context auth_context = NULL;
 349         krb5_data ap_req, chpw_req, chpw_rep;
 350         int ret, sock, addr_len;
 351         struct sockaddr remote_addr, local_addr;
 352         krb5_address local_kaddr, remote_kaddr;
 353
 354         ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
 355                                    NULL, credsp, &ap_req);
 356         if (ret) {
 357                 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
 358                 return ADS_ERROR_KRB5(ret);
 359         }
 360
 361         sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
 362         if (sock == -1) {
 363                 int rc = errno;
 364                 free(ap_req.data);
 365                 krb5_auth_con_free(context, auth_context);
 366                 DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
 367                          kdc_host, strerror(errno)));
 368                 return ADS_ERROR_SYSTEM(rc);
 369         }
 370
 371         addr_len = sizeof(remote_addr);
 372         getpeername(sock, &remote_addr, &addr_len);
 373         addr_len = sizeof(local_addr);
 374         getsockname(sock, &local_addr, &addr_len);
 375
 376         setup_kaddr(&remote_kaddr, &remote_addr);
 377         setup_kaddr(&local_kaddr, &local_addr);
 378
 379         ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
 380         if (ret) {
 381                 close(sock);
 382                 free(ap_req.data);
 383                 krb5_auth_con_free(context, auth_context);
 384                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
 385                 return ADS_ERROR_KRB5(ret);
 386         }
 387
 388         ret = build_kpasswd_request(pversion, context, auth_context, &ap_req,
 389                                   princ, newpw, &chpw_req);
 390         if (ret) {
 391                 close(sock);
 392                 free(ap_req.data);
 393                 krb5_auth_con_free(context, auth_context);
 394                 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
 395                 return ADS_ERROR_KRB5(ret);
 396         }
 397
 398         if (write(sock, chpw_req.data, chpw_req.length) != chpw_req.length) {
 399                 close(sock);
 400                 free(chpw_req.data);
 401                 free(ap_req.data);
 402                 krb5_auth_con_free(context, auth_context);
 403                 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
 404                 return ADS_ERROR_SYSTEM(errno);
 405         }
 406
 407         free(chpw_req.data);
 408
 409         chpw_rep.length = 1500;
 410         chpw_rep.data = (char *) SMB_MALLOC(chpw_rep.length);
 411         if (!chpw_rep.data) {
 412                 close(sock);
 413                 free(ap_req.data);
 414                 krb5_auth_con_free(context, auth_context);
 415                 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
 416                 errno = ENOMEM;
 417                 return ADS_ERROR_SYSTEM(errno);
 418         }
 419
 420         ret = read(sock, chpw_rep.data, chpw_rep.length);
 421         if (ret < 0) {
 422                 close(sock);
 423                 free(chpw_rep.data);
 424                 free(ap_req.data);
 425                 krb5_auth_con_free(context, auth_context);
 426                 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
 427                 return ADS_ERROR_SYSTEM(errno);
 428         }
 429
 430         close(sock);
 431         chpw_rep.length = ret;
 432
 433         ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
 434         if (ret) {
 435                 free(chpw_rep.data);
 436                 free(ap_req.data);
 437                 krb5_auth_con_free(context, auth_context);
 438                 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
 439                          error_message(ret)));
 440                 return ADS_ERROR_KRB5(ret);
 441         }
 442
 443         ret = parse_setpw_reply(context, auth_context, &chpw_rep);
 444         free(chpw_rep.data);
 445
 446         if (ret) {
 447                 free(ap_req.data);
 448                 krb5_auth_con_free(context, auth_context);
 449                 DEBUG(1,("parse_setpw_reply failed (%s)\n",
 450                          error_message(ret)));
 451                 return ADS_ERROR_KRB5(ret);
 452         }
 453
 454         free(ap_req.data);
 455         krb5_auth_con_free(context, auth_context);
 456
 457         return ADS_SUCCESS;
 458 }
 459
 460 ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ,
 461                                  const char *newpw, int time_offset)
 462 {
 463
 464         ADS_STATUS aret;
 465         krb5_error_code ret = 0;
 466         krb5_context context = NULL;
 467         krb5_principal principal = NULL;
 468         char *princ_name = NULL;
 469         char *realm = NULL;
 470         krb5_creds creds, *credsp = NULL;
 471 #if KRB5_PRINC_REALM_RETURNS_REALM
 472         krb5_realm orig_realm;
 473 #else
 474         krb5_data orig_realm;
 475 #endif
 476         krb5_ccache ccache = NULL;
 477
 478         ZERO_STRUCT(creds);
 479
 480         ret = krb5_init_context(&context);
 481         if (ret) {
 482                 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
 483                 return ADS_ERROR_KRB5(ret);
 484         }
 485
 486         if (time_offset != 0) {
 487                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 488         }
 489
 490         ret = krb5_cc_default(context, &ccache);
 491         if (ret) {
 492                 krb5_free_context(context);
 493                 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
 494                 return ADS_ERROR_KRB5(ret);
 495         }
 496
 497         realm = strchr_m(princ, '@');
 498         if (!realm) {
 499                 krb5_cc_close(context, ccache);
 500                 krb5_free_context(context);
 501                 DEBUG(1,("Failed to get realm\n"));
 502                 return ADS_ERROR_KRB5(-1);
 503         }
 504         realm++;
 505
 506         asprintf(&princ_name, "kadmin/changepw@%s", realm);
 507         ret = krb5_parse_name(context, princ_name, &creds.server);
 508         if (ret) {
 509                 krb5_cc_close(context, ccache);
 510                 krb5_free_context(context);
 511                 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
 512                 return ADS_ERROR_KRB5(ret);
 513         }
 514         free(princ_name);
 515
 516         /* parse the principal we got as a function argument */
 517         ret = krb5_parse_name(context, princ, &principal);
 518         if (ret) {
 519                 krb5_cc_close(context, ccache);
 520                 krb5_free_principal(context, creds.server);
 521                 krb5_free_context(context);
 522                 DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
 523                 return ADS_ERROR_KRB5(ret);
 524         }
 525
 526         /* The creds.server principal takes ownership of this memory.
 527                 Remember to set back to original value before freeing. */
 528         orig_realm = *krb5_princ_realm(context, creds.server);
 529         krb5_princ_set_realm(context, creds.server, krb5_princ_realm(context, principal));
 530
 531         ret = krb5_cc_get_principal(context, ccache, &creds.client);
 532         if (ret) {
 533                 krb5_cc_close(context, ccache);
 534                 krb5_princ_set_realm(context, creds.server, &orig_realm);
 535                 krb5_free_principal(context, creds.server);
 536                 krb5_free_principal(context, principal);
 537                 krb5_free_context(context);
 538                 DEBUG(1,("Failed to get principal from ccache (%s)\n",
 539                          error_message(ret)));
 540                 return ADS_ERROR_KRB5(ret);
 541         }
 542
 543         ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
 544         if (ret) {
 545                 krb5_cc_close(context, ccache);
 546                 krb5_free_principal(context, creds.client);
 547                 krb5_princ_set_realm(context, creds.server, &orig_realm);
 548                 krb5_free_principal(context, creds.server);
 549                 krb5_free_principal(context, principal);
 550                 krb5_free_context(context);
 551                 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
 552                 return ADS_ERROR_KRB5(ret);
 553         }
 554
 555         /* we might have to call krb5_free_creds(...) from now on ... */
 556
 557         aret = do_krb5_kpasswd_request(context, kdc_host,
 558                                        KRB5_KPASSWD_VERS_SETPW,
 559                                        credsp, princ, newpw);
 560
 561         krb5_free_creds(context, credsp);
 562         krb5_free_principal(context, creds.client);
 563         krb5_princ_set_realm(context, creds.server, &orig_realm);
 564         krb5_free_principal(context, creds.server);
 565         krb5_free_principal(context, principal);
 566         krb5_cc_close(context, ccache);
 567         krb5_free_context(context);
 568
 569         return aret;
 570 }
 571
 572 /*
 573   we use a prompter to avoid a crash bug in the kerberos libs when
 574   dealing with empty passwords
 575   this prompter is just a string copy ...
 576 */
 577 static krb5_error_code
 578 kerb_prompter(krb5_context ctx, void *data,
 579                const char *name,
 580                const char *banner,
 581                int num_prompts,
 582                krb5_prompt prompts[])
 583 {
 584         if (num_prompts == 0) return 0;
 585
 586         memset(prompts[0].reply->data, 0, prompts[0].reply->length);
 587         if (prompts[0].reply->length > 0) {
 588                 if (data) {
 589                         strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
 590                         prompts[0].reply->length = strlen(prompts[0].reply->data);
 591                 } else {
 592                         prompts[0].reply->length = 0;
 593                 }
 594         }
 595         return 0;
 596 }
 597
 598 static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
 599                                         const char *principal,
 600                                         const char *oldpw,
 601                                         const char *newpw,
 602                                         int time_offset)
 603 {
 604     ADS_STATUS aret;
 605     krb5_error_code ret;
 606     krb5_context context = NULL;
 607     krb5_principal princ;
 608     krb5_get_init_creds_opt opts;
 609     krb5_creds creds;
 610     char *chpw_princ = NULL, *password;
 611
 612     ret = krb5_init_context(&context);
 613     if (ret) {
 614         DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
 615         return ADS_ERROR_KRB5(ret);
 616     }
 617
 618     if ((ret = krb5_parse_name(context, principal,
 619                                     &princ))) {
 620         krb5_free_context(context);
 621         DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
 622         return ADS_ERROR_KRB5(ret);
 623     }
 624
 625     krb5_get_init_creds_opt_init(&opts);
 626     krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60);
 627     krb5_get_init_creds_opt_set_renew_life(&opts, 0);
 628     krb5_get_init_creds_opt_set_forwardable(&opts, 0);
 629     krb5_get_init_creds_opt_set_proxiable(&opts, 0);
 630
 631     /* We have to obtain an INITIAL changepw ticket for changing password */
 632     asprintf(&chpw_princ, "kadmin/changepw@%s",
 633                                 (char *) krb5_princ_realm(context, princ));
 634     password = SMB_STRDUP(oldpw);
 635     ret = krb5_get_init_creds_password(context, &creds, princ, password,
 636                                            kerb_prompter, NULL,
 637                                            0, chpw_princ, &opts);
 638     SAFE_FREE(chpw_princ);
 639     SAFE_FREE(password);
 640
 641     if (ret) {
 642       if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
 643         DEBUG(1,("Password incorrect while getting initial ticket"));
 644       else
 645         DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
 646
 647         krb5_free_principal(context, princ);
 648         krb5_free_context(context);
 649         return ADS_ERROR_KRB5(ret);
 650     }
 651
 652     aret = do_krb5_kpasswd_request(context, kdc_host,
 653                                    KRB5_KPASSWD_VERS_CHANGEPW,
 654                                    &creds, principal, newpw);
 655
 656     krb5_free_principal(context, princ);
 657     krb5_free_context(context);
 658
 659     return aret;
 660 }
 661
 662
 663 ADS_STATUS kerberos_set_password(const char *kpasswd_server,
 664                                  const char *auth_principal, const char *auth_password,
 665                                  const char *target_principal, const char *new_password,
 666                                  int time_offset)
 667 {
 668     int ret;
 669
 670     if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL, NULL))) {
 671         DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
 672         return ADS_ERROR_KRB5(ret);
 673     }
 674
 675     if (!strcmp(auth_principal, target_principal))
 676         return ads_krb5_chg_password(kpasswd_server, target_principal,
 677                                      auth_password, new_password, time_offset);
 678     else
 679         return ads_krb5_set_password(kpasswd_server, target_principal,
 680                                      new_password, time_offset);
 681 }
 682
 683
 684 /**
 685  * Set the machine account password
 686  * @param ads connection to ads server
 687  * @param hostname machine whose password is being set
 688  * @param password new password
 689  * @return status of password change
 690  **/
 691 ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
 692                                     const char *machine_account,
 693                                     const char *password)
 694 {
 695         ADS_STATUS status;
 696         char *principal = NULL;
 697
 698         /*
 699           we need to use the '$' form of the name here (the machine account name),
 700           as otherwise the server might end up setting the password for a user
 701           instead
 702          */
 703         asprintf(&principal, "%s@%s", machine_account, ads->config.realm);
 704
 705         status = ads_krb5_set_password(ads->auth.kdc_server, principal,
 706                                        password, ads->auth.time_offset);
 707
 708         free(principal);
 709
 710         return status;
 711 }
 712
 713
 714
 715 #endif