source/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                 2
  29 #define KRB5_KPASSWD_VERS_SETPW_MS              0xff80
  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         struct asn1_data req;
  53         DATA_BLOB ret;
  54
  55
  56         princ = strdup(principal);
  57
  58         if ((c = strchr(princ, '/')) == NULL) {
  59             c = princ;
  60         } else {
  61             *c = '\0';
  62             c++;
  63             princ_part1 = princ;
  64         }
  65
  66         princ_part2 = c;
  67
  68         if ((c = strchr(c, '@')) != NULL) {
  69             *c = '\0';
  70             c++;
  71             realm = c;
  72         }
  73
  74         memset(&req, 0, sizeof(req));
  75
  76         asn1_push_tag(&req, ASN1_SEQUENCE(0));
  77         asn1_push_tag(&req, ASN1_CONTEXT(0));
  78         asn1_write_OctetString(&req, password, strlen(password));
  79         asn1_pop_tag(&req);
  80
  81         asn1_push_tag(&req, ASN1_CONTEXT(1));
  82         asn1_push_tag(&req, ASN1_SEQUENCE(0));
  83
  84         asn1_push_tag(&req, ASN1_CONTEXT(0));
  85         asn1_write_Integer(&req, 1);
  86         asn1_pop_tag(&req);
  87
  88         asn1_push_tag(&req, ASN1_CONTEXT(1));
  89         asn1_push_tag(&req, ASN1_SEQUENCE(0));
  90
  91         if (princ_part1)
  92             asn1_write_GeneralString(&req, princ_part1);
  93
  94         asn1_write_GeneralString(&req, princ_part2);
  95         asn1_pop_tag(&req);
  96         asn1_pop_tag(&req);
  97         asn1_pop_tag(&req);
  98         asn1_pop_tag(&req);
  99
 100         asn1_push_tag(&req, ASN1_CONTEXT(2));
 101         asn1_write_GeneralString(&req, realm);
 102         asn1_pop_tag(&req);
 103         asn1_pop_tag(&req);
 104
 105         ret = data_blob(req.data, req.length);
 106         asn1_free(&req);
 107
 108         free(princ);
 109
 110         return ret;
 111 }
 112
 113 static krb5_error_code build_kpasswd_request(uint16_t pversion,
 114                                            krb5_context context,
 115                                            krb5_auth_context auth_context,
 116                                            krb5_data *ap_req,
 117                                            const char *princ,
 118                                            const char *passwd,
 119                                            krb5_data *packet)
 120 {
 121         krb5_error_code ret;
 122         krb5_data cipherpw;
 123         krb5_data encoded_setpw;
 124         krb5_replay_data replay;
 125         char *p;
 126         DATA_BLOB setpw;
 127
 128         ret = krb5_auth_con_setflags(context,
 129                                      auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 130         if (ret) {
 131                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 132                          error_message(ret)));
 133                 return ret;
 134         }
 135
 136         /* handle protocol differences in chpw and setpw */
 137         if (pversion  == KRB5_KPASSWD_VERS_CHANGEPW)
 138                 setpw = data_blob(passwd, strlen(passwd));
 139         else if (pversion == KRB5_KPASSWD_VERS_SETPW ||
 140                  pversion == KRB5_KPASSWD_VERS_SETPW_MS)
 141                 setpw = encode_krb5_setpw(princ, passwd);
 142         else
 143                 return EINVAL;
 144
 145         encoded_setpw.data = (char *)setpw.data;
 146         encoded_setpw.length = setpw.length;
 147
 148         ret = krb5_mk_priv(context, auth_context,
 149                            &encoded_setpw, &cipherpw, &replay);
 150
 151         data_blob_free(&setpw);         /*from 'encode_krb5_setpw(...)' */
 152
 153         if (ret) {
 154                 DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret)));
 155                 return ret;
 156         }
 157
 158         packet->data = (char *)malloc(ap_req->length + cipherpw.length + 6);
 159         if (!packet->data)
 160                 return -1;
 161
 162         /* see the RFC for details */
 163         p = ((char *)packet->data) + 2;
 164         RSSVAL(p, 0, pversion);
 165         p += 2;
 166         RSSVAL(p, 0, ap_req->length);
 167         p += 2;
 168         memcpy(p, ap_req->data, ap_req->length);
 169         p += ap_req->length;
 170         memcpy(p, cipherpw.data, cipherpw.length);
 171         p += cipherpw.length;
 172         packet->length = PTR_DIFF(p,packet->data);
 173         RSSVAL(packet->data, 0, packet->length);
 174
 175         free(cipherpw.data);    /* from 'krb5_mk_priv(...)' */
 176
 177         return 0;
 178 }
 179
 180 static const struct kpasswd_errors {
 181         int result_code;
 182         const char *error_string;
 183 } kpasswd_errors[] = {
 184         {KRB5_KPASSWD_MALFORMED, "Malformed request error"},
 185         {KRB5_KPASSWD_HARDERROR, "Server error"},
 186         {KRB5_KPASSWD_AUTHERROR, "Authentication error"},
 187         {KRB5_KPASSWD_SOFTERROR, "Password change rejected"},
 188         {KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"},
 189         {KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"},
 190         {KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"},
 191         {KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"},
 192         {KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"},
 193         {KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"},
 194         {0, NULL}
 195 };
 196
 197 static krb5_error_code setpw_result_code_string(krb5_context context,
 198                                                 int result_code,
 199                                                 const char **code_string)
 200 {
 201         uint_t idx = 0;
 202
 203         while (kpasswd_errors[idx].error_string != NULL) {
 204                 if (kpasswd_errors[idx].result_code ==
 205                     result_code) {
 206                         *code_string = kpasswd_errors[idx].error_string;
 207                         return 0;
 208                 }
 209                 idx++;
 210         }
 211         *code_string = "Password change failed";
 212         return (0);
 213 }
 214
 215 static krb5_error_code parse_setpw_reply(krb5_context context,
 216                                          krb5_auth_context auth_context,
 217                                          krb5_data *packet)
 218 {
 219         krb5_data ap_rep;
 220         char *p;
 221         int vnum, ret, res_code;
 222         krb5_data cipherresult;
 223         krb5_data clearresult;
 224         krb5_ap_rep_enc_part *ap_rep_enc;
 225         krb5_replay_data replay;
 226
 227         if (packet->length < 4) {
 228                 return KRB5KRB_AP_ERR_MODIFIED;
 229         }
 230
 231         p = packet->data;
 232
 233         if (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e) {
 234                 /* it's an error packet. We should parse it ... */
 235                 DEBUG(1,("Got error packet 0x%x from kpasswd server\n",
 236                          ((char *)packet->data)[0]));
 237                 return KRB5KRB_AP_ERR_MODIFIED;
 238         }
 239
 240         if (RSVAL(p, 0) != packet->length) {
 241                 DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
 242                          RSVAL(p, 0), packet->length));
 243                 return KRB5KRB_AP_ERR_MODIFIED;
 244         }
 245
 246         p += 2;
 247
 248         vnum = RSVAL(p, 0); p += 2;
 249
 250         /* FIXME: According to standard there is only one type of reply */
 251         if (vnum != KRB5_KPASSWD_VERS_SETPW &&
 252             vnum != KRB5_KPASSWD_VERS_SETPW_MS &&
 253             vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
 254                 DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
 255                 return KRB5KDC_ERR_BAD_PVNO;
 256         }
 257
 258         ap_rep.length = RSVAL(p, 0); p += 2;
 259
 260         if (p + ap_rep.length >= (char *)packet->data + packet->length) {
 261                 DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
 262                 return KRB5KRB_AP_ERR_MODIFIED;
 263         }
 264
 265         if (ap_rep.length == 0) {
 266                 DEBUG(1,("got unencrypted setpw result?!\n"));
 267                 return KRB5KRB_AP_ERR_MODIFIED;
 268         }
 269
 270         /* verify ap_rep */
 271         ap_rep.data = p;
 272         p += ap_rep.length;
 273
 274         ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
 275         if (ret) {
 276                 DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret)));
 277                 return KRB5KRB_AP_ERR_MODIFIED;
 278         }
 279
 280         krb5_free_ap_rep_enc_part(context, ap_rep_enc);
 281
 282         cipherresult.data = p;
 283         cipherresult.length = ((char *)packet->data + packet->length) - p;
 284
 285         ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
 286                            &replay);
 287         if (ret) {
 288                 DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret)));
 289                 return KRB5KRB_AP_ERR_MODIFIED;
 290         }
 291
 292         if (clearresult.length < 2) {
 293                 free(clearresult.data);
 294                 ret = KRB5KRB_AP_ERR_MODIFIED;
 295                 return KRB5KRB_AP_ERR_MODIFIED;
 296         }
 297
 298         p = clearresult.data;
 299
 300         res_code = RSVAL(p, 0);
 301
 302         free(clearresult.data);
 303
 304         if ((res_code < KRB5_KPASSWD_SUCCESS) ||
 305             (res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) {
 306                 return KRB5KRB_AP_ERR_MODIFIED;
 307         }
 308
 309         if(res_code == KRB5_KPASSWD_SUCCESS)
 310                         return 0;
 311         else {
 312                 const char *errstr;
 313                 setpw_result_code_string(context, res_code, &errstr);
 314                 DEBUG(1, ("Error changing password: %s\n", errstr));
 315
 316                 switch(res_code) {
 317                         case KRB5_KPASSWD_ACCESSDENIED:
 318                                 return KRB5KDC_ERR_BADOPTION;
 319                                 break;
 320                         case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
 321                                 return KRB5KDC_ERR_BADOPTION;
 322                                 /* return KV5M_ALT_METHOD; MIT-only define */
 323                                 break;
 324                         case KRB5_KPASSWD_ETYPE_NOSUPP:
 325                                 return KRB5KDC_ERR_ETYPE_NOSUPP;
 326                                 break;
 327                         case KRB5_KPASSWD_BAD_PRINCIPAL:
 328                                 return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 329                                 break;
 330                         case KRB5_KPASSWD_POLICY_REJECT:
 331                                 return KRB5KDC_ERR_POLICY;
 332                                 break;
 333                         default:
 334                                 return KRB5KRB_ERR_GENERIC;
 335                                 break;
 336                 }
 337         }
 338 }
 339
 340 static ADS_STATUS do_krb5_kpasswd_request(krb5_context context,
 341                                           const char *kdc_host,
 342                                           uint16_t pversion,
 343                                           krb5_creds *credsp,
 344                                           const char *princ,
 345                                           const char *newpw)
 346 {
 347         krb5_auth_context auth_context = NULL;
 348         krb5_data ap_req, chpw_req, chpw_rep;
 349         int ret, sock, addr_len;
 350         struct sockaddr remote_addr, local_addr;
 351         krb5_address local_kaddr, remote_kaddr;
 352
 353         ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
 354                                    NULL, credsp, &ap_req);
 355         if (ret) {
 356                 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
 357                 return ADS_ERROR_KRB5(ret);
 358         }
 359
 360         sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
 361         if (sock == -1) {
 362                 int rc = errno;
 363                 free(ap_req.data);
 364                 krb5_auth_con_free(context, auth_context);
 365                 DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
 366                          kdc_host, strerror(errno)));
 367                 return ADS_ERROR_SYSTEM(rc);
 368         }
 369
 370         addr_len = sizeof(remote_addr);
 371         getpeername(sock, &remote_addr, &addr_len);
 372         addr_len = sizeof(local_addr);
 373         getsockname(sock, &local_addr, &addr_len);
 374
 375         setup_kaddr(&remote_kaddr, &remote_addr);
 376         setup_kaddr(&local_kaddr, &local_addr);
 377
 378         ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
 379         if (ret) {
 380                 close(sock);
 381                 free(ap_req.data);
 382                 krb5_auth_con_free(context, auth_context);
 383                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
 384                 return ADS_ERROR_KRB5(ret);
 385         }
 386
 387         ret = build_kpasswd_request(pversion, context, auth_context, &ap_req,
 388                                   princ, newpw, &chpw_req);
 389         if (ret) {
 390                 close(sock);
 391                 free(ap_req.data);
 392                 krb5_auth_con_free(context, auth_context);
 393                 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
 394                 return ADS_ERROR_KRB5(ret);
 395         }
 396
 397         if (write(sock, chpw_req.data, chpw_req.length) != chpw_req.length) {
 398                 close(sock);
 399                 free(chpw_req.data);
 400                 free(ap_req.data);
 401                 krb5_auth_con_free(context, auth_context);
 402                 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
 403                 return ADS_ERROR_SYSTEM(errno);
 404         }
 405
 406         free(chpw_req.data);
 407
 408         chpw_rep.length = 1500;
 409         chpw_rep.data = (char *) malloc(chpw_rep.length);
 410         if (!chpw_rep.data) {
 411                 close(sock);
 412                 free(ap_req.data);
 413                 krb5_auth_con_free(context, auth_context);
 414                 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
 415                 errno = ENOMEM;
 416                 return ADS_ERROR_SYSTEM(errno);
 417         }
 418
 419         ret = read(sock, chpw_rep.data, chpw_rep.length);
 420         if (ret < 0) {
 421                 close(sock);
 422                 free(chpw_rep.data);
 423                 free(ap_req.data);
 424                 krb5_auth_con_free(context, auth_context);
 425                 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
 426                 return ADS_ERROR_SYSTEM(errno);
 427         }
 428
 429         close(sock);
 430         chpw_rep.length = ret;
 431
 432         ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
 433         if (ret) {
 434                 free(chpw_rep.data);
 435                 free(ap_req.data);
 436                 krb5_auth_con_free(context, auth_context);
 437                 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
 438                          error_message(ret)));
 439                 return ADS_ERROR_KRB5(ret);
 440         }
 441
 442         ret = parse_setpw_reply(context, auth_context, &chpw_rep);
 443         free(chpw_rep.data);
 444
 445         if (ret) {
 446                 free(ap_req.data);
 447                 krb5_auth_con_free(context, auth_context);
 448                 DEBUG(1,("parse_setpw_reply failed (%s)\n",
 449                          error_message(ret)));
 450                 return ADS_ERROR_KRB5(ret);
 451         }
 452
 453         free(ap_req.data);
 454         krb5_auth_con_free(context, auth_context);
 455
 456         return ADS_SUCCESS;
 457 }
 458
 459 ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ,
 460                                  const char *newpw, int time_offset)
 461 {
 462
 463         ADS_STATUS aret;
 464         krb5_error_code ret;
 465         krb5_context context;
 466         krb5_principal principal;
 467         char *princ_name;
 468         char *realm;
 469         krb5_creds creds, *credsp;
 470         krb5_ccache ccache;
 471
 472         ret = krb5_init_context(&context);
 473         if (ret) {
 474                 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
 475                 return ADS_ERROR_KRB5(ret);
 476         }
 477
 478         if (time_offset != 0) {
 479                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 480         }
 481
 482         ret = krb5_cc_default(context, &ccache);
 483         if (ret) {
 484                 krb5_free_context(context);
 485                 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
 486                 return ADS_ERROR_KRB5(ret);
 487         }
 488
 489         ZERO_STRUCT(creds);
 490
 491         realm = strchr(princ, '@');
 492         realm++;
 493
 494         asprintf(&princ_name, "kadmin/changepw@%s", realm);
 495         ret = krb5_parse_name(context, princ_name, &creds.server);
 496         if (ret) {
 497                 krb5_free_context(context);
 498                 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
 499                 return ADS_ERROR_KRB5(ret);
 500         }
 501         free(princ_name);
 502
 503         /* parse the principal we got as a function argument */
 504         ret = krb5_parse_name(context, princ, &principal);
 505         if (ret) {
 506                 krb5_free_context(context);
 507                 DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
 508                 return ADS_ERROR_KRB5(ret);
 509         }
 510
 511         krb5_princ_set_realm(context, creds.server,
 512                              krb5_princ_realm(context, principal));
 513
 514         ret = krb5_cc_get_principal(context, ccache, &creds.client);
 515         if (ret) {
 516                 krb5_free_principal(context, principal);
 517                 krb5_free_context(context);
 518                 DEBUG(1,("Failed to get principal from ccache (%s)\n",
 519                          error_message(ret)));
 520                 return ADS_ERROR_KRB5(ret);
 521         }
 522
 523         ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
 524         if (ret) {
 525                 krb5_free_principal(context, creds.client);
 526                 krb5_free_principal(context, principal);
 527                 krb5_free_context(context);
 528                 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
 529                 return ADS_ERROR_KRB5(ret);
 530         }
 531
 532         /* we might have to call krb5_free_creds(...) from now on ... */
 533
 534         aret = do_krb5_kpasswd_request(context, kdc_host,
 535                                        KRB5_KPASSWD_VERS_SETPW_MS,
 536                                        credsp, princ, newpw);
 537
 538         krb5_free_creds(context, credsp);
 539         krb5_free_principal(context, creds.client);
 540         krb5_free_principal(context, principal);
 541         krb5_free_context(context);
 542
 543         return aret;
 544 }
 545
 546 /*
 547   we use a prompter to avoid a crash bug in the kerberos libs when
 548   dealing with empty passwords
 549   this prompter is just a string copy ...
 550 */
 551 static krb5_error_code
 552 kerb_prompter(krb5_context ctx, void *data,
 553                const char *name,
 554                const char *banner,
 555                int num_prompts,
 556                krb5_prompt prompts[])
 557 {
 558         if (num_prompts == 0) return 0;
 559
 560         memset(prompts[0].reply->data, 0, prompts[0].reply->length);
 561         if (prompts[0].reply->length > 0) {
 562                 if (data) {
 563                         strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
 564                         prompts[0].reply->length = strlen(prompts[0].reply->data);
 565                 } else {
 566                         prompts[0].reply->length = 0;
 567                 }
 568         }
 569         return 0;
 570 }
 571
 572 static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
 573                                         const char *principal,
 574                                         const char *oldpw,
 575                                         const char *newpw,
 576                                         int time_offset)
 577 {
 578     ADS_STATUS aret;
 579     krb5_error_code ret;
 580     krb5_context context;
 581     krb5_principal princ;
 582     krb5_get_init_creds_opt opts;
 583     krb5_creds creds;
 584     char *chpw_princ = NULL, *password;
 585
 586     ret = krb5_init_context(&context);
 587     if (ret) {
 588         DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
 589         return ADS_ERROR_KRB5(ret);
 590     }
 591
 592     if ((ret = krb5_parse_name(context, principal,
 593                                     &princ))) {
 594         krb5_free_context(context);
 595         DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
 596         return ADS_ERROR_KRB5(ret);
 597     }
 598
 599     krb5_get_init_creds_opt_init(&opts);
 600     krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60);
 601     krb5_get_init_creds_opt_set_renew_life(&opts, 0);
 602     krb5_get_init_creds_opt_set_forwardable(&opts, 0);
 603     krb5_get_init_creds_opt_set_proxiable(&opts, 0);
 604
 605     /* We have to obtain an INITIAL changepw ticket for changing password */
 606     asprintf(&chpw_princ, "kadmin/changepw@%s",
 607                                 (char *) krb5_princ_realm(context, princ));
 608     password = strdup(oldpw);
 609     ret = krb5_get_init_creds_password(context, &creds, princ, password,
 610                                            kerb_prompter, NULL,
 611                                            0, chpw_princ, &opts);
 612     SAFE_FREE(chpw_princ);
 613     SAFE_FREE(password);
 614
 615     if (ret) {
 616       if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
 617         DEBUG(1,("Password incorrect while getting initial ticket"));
 618       else
 619         DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
 620
 621         krb5_free_principal(context, princ);
 622         krb5_free_context(context);
 623         return ADS_ERROR_KRB5(ret);
 624     }
 625
 626     aret = do_krb5_kpasswd_request(context, kdc_host,
 627                                    KRB5_KPASSWD_VERS_CHANGEPW,
 628                                    &creds, principal, newpw);
 629
 630     krb5_free_principal(context, princ);
 631     krb5_free_context(context);
 632
 633     return aret;
 634 }
 635
 636
 637 ADS_STATUS kerberos_set_password(const char *kpasswd_server,
 638                                  const char *auth_principal, const char *auth_password,
 639                                  const char *target_principal, const char *new_password,
 640                                  int time_offset)
 641 {
 642     int ret;
 643
 644     if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset))) {
 645         DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
 646         return ADS_ERROR_KRB5(ret);
 647     }
 648
 649     if (!strcmp(auth_principal, target_principal))
 650         return ads_krb5_chg_password(kpasswd_server, target_principal,
 651                                      auth_password, new_password, time_offset);
 652     else
 653         return ads_krb5_set_password(kpasswd_server, target_principal,
 654                                      new_password, time_offset);
 655 }
 656
 657
 658 /**
 659  * Set the machine account password
 660  * @param ads connection to ads server
 661  * @param hostname machine whose password is being set
 662  * @param password new password
 663  * @return status of password change
 664  **/
 665 ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
 666                                     const char *machine_account,
 667                                     const char *password)
 668 {
 669         ADS_STATUS status;
 670         char *principal = NULL;
 671
 672         /*
 673           we need to use the '$' form of the name here (the machine account name),
 674           as otherwise the server might end up setting the password for a user
 675           instead
 676          */
 677         asprintf(&principal, "%s@%s", machine_account, ads->config.realm);
 678
 679         status = ads_krb5_set_password(ads->auth.kdc_server, principal,
 680                                        password, ads->auth.time_offset);
 681
 682         free(principal);
 683
 684         return status;
 685 }
 686
 687
 688
 689 #endif