git.maemo.org Git - samba/blob - 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                 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                         case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
 321                                 return KRB5KDC_ERR_BADOPTION;
 322                                 /* return KV5M_ALT_METHOD; MIT-only define */
 323                         case KRB5_KPASSWD_ETYPE_NOSUPP:
 324                                 return KRB5KDC_ERR_ETYPE_NOSUPP;
 325                         case KRB5_KPASSWD_BAD_PRINCIPAL:
 326                                 return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 327                         case KRB5_KPASSWD_POLICY_REJECT:
 328                                 return KRB5KDC_ERR_POLICY;
 329                         default:
 330                                 return KRB5KRB_ERR_GENERIC;
 331                 }
 332         }
 333 }
 334
 335 static ADS_STATUS do_krb5_kpasswd_request(krb5_context context,
 336                                           const char *kdc_host,
 337                                           uint16 pversion,
 338                                           krb5_creds *credsp,
 339                                           const char *princ,
 340                                           const char *newpw)
 341 {
 342         krb5_auth_context auth_context = NULL;
 343         krb5_data ap_req, chpw_req, chpw_rep;
 344         int ret, sock;
 345         socklen_t addr_len;
 346         struct sockaddr remote_addr, local_addr;
 347         krb5_address local_kaddr, remote_kaddr;
 348
 349         ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
 350                                    NULL, credsp, &ap_req);
 351         if (ret) {
 352                 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
 353                 return ADS_ERROR_KRB5(ret);
 354         }
 355
 356         sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
 357         if (sock == -1) {
 358                 int rc = errno;
 359                 free(ap_req.data);
 360                 krb5_auth_con_free(context, auth_context);
 361                 DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
 362                          kdc_host, strerror(errno)));
 363                 return ADS_ERROR_SYSTEM(rc);
 364         }
 365
 366         addr_len = sizeof(remote_addr);
 367         getpeername(sock, &remote_addr, &addr_len);
 368         addr_len = sizeof(local_addr);
 369         getsockname(sock, &local_addr, &addr_len);
 370
 371         setup_kaddr(&remote_kaddr, &remote_addr);
 372         setup_kaddr(&local_kaddr, &local_addr);
 373
 374         ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
 375         if (ret) {
 376                 close(sock);
 377                 free(ap_req.data);
 378                 krb5_auth_con_free(context, auth_context);
 379                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
 380                 return ADS_ERROR_KRB5(ret);
 381         }
 382
 383         ret = build_kpasswd_request(pversion, context, auth_context, &ap_req,
 384                                   princ, newpw, &chpw_req);
 385         if (ret) {
 386                 close(sock);
 387                 free(ap_req.data);
 388                 krb5_auth_con_free(context, auth_context);
 389                 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
 390                 return ADS_ERROR_KRB5(ret);
 391         }
 392
 393         if (write(sock, chpw_req.data, chpw_req.length) != chpw_req.length) {
 394                 close(sock);
 395                 free(chpw_req.data);
 396                 free(ap_req.data);
 397                 krb5_auth_con_free(context, auth_context);
 398                 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
 399                 return ADS_ERROR_SYSTEM(errno);
 400         }
 401
 402         free(chpw_req.data);
 403
 404         chpw_rep.length = 1500;
 405         chpw_rep.data = (char *) SMB_MALLOC(chpw_rep.length);
 406         if (!chpw_rep.data) {
 407                 close(sock);
 408                 free(ap_req.data);
 409                 krb5_auth_con_free(context, auth_context);
 410                 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
 411                 errno = ENOMEM;
 412                 return ADS_ERROR_SYSTEM(errno);
 413         }
 414
 415         ret = read(sock, chpw_rep.data, chpw_rep.length);
 416         if (ret < 0) {
 417                 close(sock);
 418                 free(chpw_rep.data);
 419                 free(ap_req.data);
 420                 krb5_auth_con_free(context, auth_context);
 421                 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
 422                 return ADS_ERROR_SYSTEM(errno);
 423         }
 424
 425         close(sock);
 426         chpw_rep.length = ret;
 427
 428         ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
 429         if (ret) {
 430                 free(chpw_rep.data);
 431                 free(ap_req.data);
 432                 krb5_auth_con_free(context, auth_context);
 433                 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
 434                          error_message(ret)));
 435                 return ADS_ERROR_KRB5(ret);
 436         }
 437
 438         ret = parse_setpw_reply(context, auth_context, &chpw_rep);
 439         free(chpw_rep.data);
 440
 441         if (ret) {
 442                 free(ap_req.data);
 443                 krb5_auth_con_free(context, auth_context);
 444                 DEBUG(1,("parse_setpw_reply failed (%s)\n",
 445                          error_message(ret)));
 446                 return ADS_ERROR_KRB5(ret);
 447         }
 448
 449         free(ap_req.data);
 450         krb5_auth_con_free(context, auth_context);
 451
 452         return ADS_SUCCESS;
 453 }
 454
 455 ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ,
 456                                  const char *newpw, int time_offset)
 457 {
 458
 459         ADS_STATUS aret;
 460         krb5_error_code ret = 0;
 461         krb5_context context = NULL;
 462         krb5_principal principal = NULL;
 463         char *princ_name = NULL;
 464         char *realm = NULL;
 465         krb5_creds creds, *credsp = NULL;
 466 #if KRB5_PRINC_REALM_RETURNS_REALM
 467         krb5_realm orig_realm;
 468 #else
 469         krb5_data orig_realm;
 470 #endif
 471         krb5_ccache ccache = NULL;
 472
 473         ZERO_STRUCT(creds);
 474
 475         initialize_krb5_error_table();
 476         ret = krb5_init_context(&context);
 477         if (ret) {
 478                 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
 479                 return ADS_ERROR_KRB5(ret);
 480         }
 481
 482         if (time_offset != 0) {
 483                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 484         }
 485
 486         ret = krb5_cc_default(context, &ccache);
 487         if (ret) {
 488                 krb5_free_context(context);
 489                 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
 490                 return ADS_ERROR_KRB5(ret);
 491         }
 492
 493         realm = strchr_m(princ, '@');
 494         if (!realm) {
 495                 krb5_cc_close(context, ccache);
 496                 krb5_free_context(context);
 497                 DEBUG(1,("Failed to get realm\n"));
 498                 return ADS_ERROR_KRB5(-1);
 499         }
 500         realm++;
 501
 502         asprintf(&princ_name, "kadmin/changepw@%s", realm);
 503         ret = krb5_parse_name(context, princ_name, &creds.server);
 504         if (ret) {
 505                 krb5_cc_close(context, ccache);
 506                 krb5_free_context(context);
 507                 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
 508                 return ADS_ERROR_KRB5(ret);
 509         }
 510         free(princ_name);
 511
 512         /* parse the principal we got as a function argument */
 513         ret = krb5_parse_name(context, princ, &principal);
 514         if (ret) {
 515                 krb5_cc_close(context, ccache);
 516                 krb5_free_principal(context, creds.server);
 517                 krb5_free_context(context);
 518                 DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
 519                 return ADS_ERROR_KRB5(ret);
 520         }
 521
 522         /* The creds.server principal takes ownership of this memory.
 523                 Remember to set back to original value before freeing. */
 524         orig_realm = *krb5_princ_realm(context, creds.server);
 525         krb5_princ_set_realm(context, creds.server, krb5_princ_realm(context, principal));
 526
 527         ret = krb5_cc_get_principal(context, ccache, &creds.client);
 528         if (ret) {
 529                 krb5_cc_close(context, ccache);
 530                 krb5_princ_set_realm(context, creds.server, &orig_realm);
 531                 krb5_free_principal(context, creds.server);
 532                 krb5_free_principal(context, principal);
 533                 krb5_free_context(context);
 534                 DEBUG(1,("Failed to get principal from ccache (%s)\n",
 535                          error_message(ret)));
 536                 return ADS_ERROR_KRB5(ret);
 537         }
 538
 539         ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
 540         if (ret) {
 541                 krb5_cc_close(context, ccache);
 542                 krb5_free_principal(context, creds.client);
 543                 krb5_princ_set_realm(context, creds.server, &orig_realm);
 544                 krb5_free_principal(context, creds.server);
 545                 krb5_free_principal(context, principal);
 546                 krb5_free_context(context);
 547                 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
 548                 return ADS_ERROR_KRB5(ret);
 549         }
 550
 551         /* we might have to call krb5_free_creds(...) from now on ... */
 552
 553         aret = do_krb5_kpasswd_request(context, kdc_host,
 554                                        KRB5_KPASSWD_VERS_SETPW,
 555                                        credsp, princ, newpw);
 556
 557         krb5_free_creds(context, credsp);
 558         krb5_free_principal(context, creds.client);
 559         krb5_princ_set_realm(context, creds.server, &orig_realm);
 560         krb5_free_principal(context, creds.server);
 561         krb5_free_principal(context, principal);
 562         krb5_cc_close(context, ccache);
 563         krb5_free_context(context);
 564
 565         return aret;
 566 }
 567
 568 /*
 569   we use a prompter to avoid a crash bug in the kerberos libs when
 570   dealing with empty passwords
 571   this prompter is just a string copy ...
 572 */
 573 static krb5_error_code
 574 kerb_prompter(krb5_context ctx, void *data,
 575                const char *name,
 576                const char *banner,
 577                int num_prompts,
 578                krb5_prompt prompts[])
 579 {
 580         if (num_prompts == 0) return 0;
 581
 582         memset(prompts[0].reply->data, 0, prompts[0].reply->length);
 583         if (prompts[0].reply->length > 0) {
 584                 if (data) {
 585                         strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
 586                         prompts[0].reply->length = strlen(prompts[0].reply->data);
 587                 } else {
 588                         prompts[0].reply->length = 0;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
 595                                         const char *principal,
 596                                         const char *oldpw,
 597                                         const char *newpw,
 598                                         int time_offset)
 599 {
 600     ADS_STATUS aret;
 601     krb5_error_code ret;
 602     krb5_context context = NULL;
 603     krb5_principal princ;
 604     krb5_get_init_creds_opt opts;
 605     krb5_creds creds;
 606     char *chpw_princ = NULL, *password;
 607
 608     initialize_krb5_error_table();
 609     ret = krb5_init_context(&context);
 610     if (ret) {
 611         DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
 612         return ADS_ERROR_KRB5(ret);
 613     }
 614
 615     if ((ret = krb5_parse_name(context, principal,
 616                                     &princ))) {
 617         krb5_free_context(context);
 618         DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
 619         return ADS_ERROR_KRB5(ret);
 620     }
 621
 622     krb5_get_init_creds_opt_init(&opts);
 623     krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60);
 624     krb5_get_init_creds_opt_set_renew_life(&opts, 0);
 625     krb5_get_init_creds_opt_set_forwardable(&opts, 0);
 626     krb5_get_init_creds_opt_set_proxiable(&opts, 0);
 627
 628     /* We have to obtain an INITIAL changepw ticket for changing password */
 629     asprintf(&chpw_princ, "kadmin/changepw@%s",
 630                                 (char *) krb5_princ_realm(context, princ));
 631     password = SMB_STRDUP(oldpw);
 632     ret = krb5_get_init_creds_password(context, &creds, princ, password,
 633                                            kerb_prompter, NULL,
 634                                            0, chpw_princ, &opts);
 635     SAFE_FREE(chpw_princ);
 636     SAFE_FREE(password);
 637
 638     if (ret) {
 639       if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
 640         DEBUG(1,("Password incorrect while getting initial ticket"));
 641       else
 642         DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
 643
 644         krb5_free_principal(context, princ);
 645         krb5_free_context(context);
 646         return ADS_ERROR_KRB5(ret);
 647     }
 648
 649     aret = do_krb5_kpasswd_request(context, kdc_host,
 650                                    KRB5_KPASSWD_VERS_CHANGEPW,
 651                                    &creds, principal, newpw);
 652
 653     krb5_free_principal(context, princ);
 654     krb5_free_context(context);
 655
 656     return aret;
 657 }
 658
 659
 660 ADS_STATUS kerberos_set_password(const char *kpasswd_server,
 661                                  const char *auth_principal, const char *auth_password,
 662                                  const char *target_principal, const char *new_password,
 663                                  int time_offset)
 664 {
 665     int ret;
 666
 667     if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL, NULL))) {
 668         DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
 669         return ADS_ERROR_KRB5(ret);
 670     }
 671
 672     if (!strcmp(auth_principal, target_principal))
 673         return ads_krb5_chg_password(kpasswd_server, target_principal,
 674                                      auth_password, new_password, time_offset);
 675     else
 676         return ads_krb5_set_password(kpasswd_server, target_principal,
 677                                      new_password, time_offset);
 678 }
 679
 680
 681 /**
 682  * Set the machine account password
 683  * @param ads connection to ads server
 684  * @param hostname machine whose password is being set
 685  * @param password new password
 686  * @return status of password change
 687  **/
 688 ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
 689                                     const char *machine_account,
 690                                     const char *password)
 691 {
 692         ADS_STATUS status;
 693         char *principal = NULL;
 694
 695         /*
 696           we need to use the '$' form of the name here (the machine account name),
 697           as otherwise the server might end up setting the password for a user
 698           instead
 699          */
 700         asprintf(&principal, "%s@%s", machine_account, ads->config.realm);
 701
 702         status = ads_krb5_set_password(ads->auth.kdc_server, principal,
 703                                        password, ads->auth.time_offset);
 704
 705         free(principal);
 706
 707         return status;
 708 }
 709
 710
 711
 712 #endif