lib/krb5/changepw.c

   1 /*
   2  * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 #undef __attribute__
  37 #define __attribute__(X)
  38
  39
  40 static void
  41 str2data (krb5_data *d,
  42           const char *fmt,
  43           ...) __attribute__ ((format (printf, 2, 3)));
  44
  45 static void
  46 str2data (krb5_data *d,
  47           const char *fmt,
  48           ...)
  49 {
  50     va_list args;
  51     char *str;
  52
  53     va_start(args, fmt);
  54     d->length = vasprintf (&str, fmt, args);
  55     va_end(args);
  56     d->data = str;
  57 }
  58
  59 /*
  60  * Change password protocol defined by
  61  * draft-ietf-cat-kerb-chg-password-02.txt
  62  *
  63  * Share the response part of the protocol with MS set password
  64  * (RFC3244)
  65  */
  66
  67 static krb5_error_code
  68 chgpw_send_request (krb5_context context,
  69                     krb5_auth_context *auth_context,
  70                     krb5_creds *creds,
  71                     krb5_principal targprinc,
  72                     int is_stream,
  73                     rk_socket_t sock,
  74                     const char *passwd,
  75                     const char *host)
  76 {
  77     krb5_error_code ret;
  78     krb5_data ap_req_data;
  79     krb5_data krb_priv_data;
  80     krb5_data passwd_data;
  81     size_t len;
  82     u_char header[6];
  83     struct iovec iov[3];
  84     struct msghdr msghdr;
  85
  86     if (is_stream)
  87         return KRB5_KPASSWD_MALFORMED;
  88
  89     if (targprinc &&
  90         krb5_principal_compare(context, creds->client, targprinc) != TRUE)
  91         return KRB5_KPASSWD_MALFORMED;
  92
  93     krb5_data_zero (&ap_req_data);
  94
  95     ret = krb5_mk_req_extended (context,
  96                                 auth_context,
  97                                 AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
  98                                 NULL, /* in_data */
  99                                 creds,
 100                                 &ap_req_data);
 101     if (ret)
 102         return ret;
 103
 104     passwd_data.data   = rk_UNCONST(passwd);
 105     passwd_data.length = strlen(passwd);
 106
 107     krb5_data_zero (&krb_priv_data);
 108
 109     ret = krb5_mk_priv (context,
 110                         *auth_context,
 111                         &passwd_data,
 112                         &krb_priv_data,
 113                         NULL);
 114     if (ret)
 115         goto out2;
 116
 117     len = 6 + ap_req_data.length + krb_priv_data.length;
 118     header[0] = (len >> 8) & 0xFF;
 119     header[1] = (len >> 0) & 0xFF;
 120     header[2] = 0;
 121     header[3] = 1;
 122     header[4] = (ap_req_data.length >> 8) & 0xFF;
 123     header[5] = (ap_req_data.length >> 0) & 0xFF;
 124
 125     memset(&msghdr, 0, sizeof(msghdr));
 126     msghdr.msg_name       = NULL;
 127     msghdr.msg_namelen    = 0;
 128     msghdr.msg_iov        = iov;
 129     msghdr.msg_iovlen     = sizeof(iov)/sizeof(*iov);
 130 #if 0
 131     msghdr.msg_control    = NULL;
 132     msghdr.msg_controllen = 0;
 133 #endif
 134
 135     iov[0].iov_base    = (void*)header;
 136     iov[0].iov_len     = 6;
 137     iov[1].iov_base    = ap_req_data.data;
 138     iov[1].iov_len     = ap_req_data.length;
 139     iov[2].iov_base    = krb_priv_data.data;
 140     iov[2].iov_len     = krb_priv_data.length;
 141
 142     if (rk_IS_SOCKET_ERROR( sendmsg (sock, &msghdr, 0) )) {
 143         ret = rk_SOCK_ERRNO;
 144         krb5_set_error_message(context, ret, "sendmsg %s: %s",
 145                                host, strerror(ret));
 146     }
 147
 148     krb5_data_free (&krb_priv_data);
 149 out2:
 150     krb5_data_free (&ap_req_data);
 151     return ret;
 152 }
 153
 154 /*
 155  * Set password protocol as defined by RFC3244 --
 156  * Microsoft Windows 2000 Kerberos Change Password and Set Password Protocols
 157  */
 158
 159 static krb5_error_code
 160 setpw_send_request (krb5_context context,
 161                     krb5_auth_context *auth_context,
 162                     krb5_creds *creds,
 163                     krb5_principal targprinc,
 164                     int is_stream,
 165                     rk_socket_t sock,
 166                     const char *passwd,
 167                     const char *host)
 168 {
 169     krb5_error_code ret;
 170     krb5_data ap_req_data;
 171     krb5_data krb_priv_data;
 172     krb5_data pwd_data;
 173     ChangePasswdDataMS chpw;
 174     size_t len = 0;
 175     u_char header[4 + 6];
 176     u_char *p;
 177     struct iovec iov[3];
 178     struct msghdr msghdr;
 179
 180     krb5_data_zero (&ap_req_data);
 181
 182     ret = krb5_mk_req_extended (context,
 183                                 auth_context,
 184                                 AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
 185                                 NULL, /* in_data */
 186                                 creds,
 187                                 &ap_req_data);
 188     if (ret)
 189         return ret;
 190
 191     chpw.newpasswd.length = strlen(passwd);
 192     chpw.newpasswd.data = rk_UNCONST(passwd);
 193     if (targprinc) {
 194         chpw.targname = &targprinc->name;
 195         chpw.targrealm = &targprinc->realm;
 196     } else {
 197         chpw.targname = NULL;
 198         chpw.targrealm = NULL;
 199     }
 200
 201     ASN1_MALLOC_ENCODE(ChangePasswdDataMS, pwd_data.data, pwd_data.length,
 202                        &chpw, &len, ret);
 203     if (ret) {
 204         krb5_data_free (&ap_req_data);
 205         return ret;
 206     }
 207
 208     if(pwd_data.length != len)
 209         krb5_abortx(context, "internal error in ASN.1 encoder");
 210
 211     ret = krb5_mk_priv (context,
 212                         *auth_context,
 213                         &pwd_data,
 214                         &krb_priv_data,
 215                         NULL);
 216     if (ret)
 217         goto out2;
 218
 219     len = 6 + ap_req_data.length + krb_priv_data.length;
 220     p = header;
 221     if (is_stream) {
 222         _krb5_put_int(p, len, 4);
 223         p += 4;
 224     }
 225     *p++ = (len >> 8) & 0xFF;
 226     *p++ = (len >> 0) & 0xFF;
 227     *p++ = 0xff;
 228     *p++ = 0x80;
 229     *p++ = (ap_req_data.length >> 8) & 0xFF;
 230     *p   = (ap_req_data.length >> 0) & 0xFF;
 231
 232     memset(&msghdr, 0, sizeof(msghdr));
 233     msghdr.msg_name       = NULL;
 234     msghdr.msg_namelen    = 0;
 235     msghdr.msg_iov        = iov;
 236     msghdr.msg_iovlen     = sizeof(iov)/sizeof(*iov);
 237 #if 0
 238     msghdr.msg_control    = NULL;
 239     msghdr.msg_controllen = 0;
 240 #endif
 241
 242     iov[0].iov_base    = (void*)header;
 243     if (is_stream)
 244         iov[0].iov_len     = 10;
 245     else
 246         iov[0].iov_len     = 6;
 247     iov[1].iov_base    = ap_req_data.data;
 248     iov[1].iov_len     = ap_req_data.length;
 249     iov[2].iov_base    = krb_priv_data.data;
 250     iov[2].iov_len     = krb_priv_data.length;
 251
 252     if (rk_IS_SOCKET_ERROR( sendmsg (sock, &msghdr, 0) )) {
 253         ret = rk_SOCK_ERRNO;
 254         krb5_set_error_message(context, ret, "sendmsg %s: %s",
 255                                host, strerror(ret));
 256     }
 257
 258     krb5_data_free (&krb_priv_data);
 259 out2:
 260     krb5_data_free (&ap_req_data);
 261     krb5_data_free (&pwd_data);
 262     return ret;
 263 }
 264
 265 static krb5_error_code
 266 process_reply (krb5_context context,
 267                krb5_auth_context auth_context,
 268                int is_stream,
 269                rk_socket_t sock,
 270                int *result_code,
 271                krb5_data *result_code_string,
 272                krb5_data *result_string,
 273                const char *host)
 274 {
 275     krb5_error_code ret;
 276     u_char reply[1024 * 3];
 277     size_t len;
 278     uint16_t pkt_len, pkt_ver;
 279     krb5_data ap_rep_data;
 280     int save_errno;
 281
 282     len = 0;
 283     if (is_stream) {
 284         while (len < sizeof(reply)) {
 285             unsigned long size;
 286
 287             ret = recvfrom (sock, reply + len, sizeof(reply) - len,
 288                             0, NULL, NULL);
 289             if (rk_IS_SOCKET_ERROR(ret)) {
 290                 save_errno = rk_SOCK_ERRNO;
 291                 krb5_set_error_message(context, save_errno,
 292                                        "recvfrom %s: %s",
 293                                        host, strerror(save_errno));
 294                 return save_errno;
 295             } else if (ret == 0) {
 296                 krb5_set_error_message(context, 1,"recvfrom timeout %s", host);
 297                 return 1;
 298             }
 299             len += ret;
 300             if (len < 4)
 301                 continue;
 302             _krb5_get_int(reply, &size, 4);
 303             if (size + 4 < len)
 304                 continue;
 305             if (sizeof(reply) - 4 < size) {
 306                 krb5_set_error_message(context, ERANGE, "size from server too large %s", host);
 307                 return ERANGE;
 308             }
 309             memmove(reply, reply + 4, size);
 310             len = size;
 311             break;
 312         }
 313         if (len == sizeof(reply)) {
 314             krb5_set_error_message(context, ENOMEM,
 315                                    N_("Message too large from %s", "host"),
 316                                    host);
 317             return ENOMEM;
 318         }
 319     } else {
 320         ret = recvfrom (sock, reply, sizeof(reply), 0, NULL, NULL);
 321         if (rk_IS_SOCKET_ERROR(ret)) {
 322             save_errno = rk_SOCK_ERRNO;
 323             krb5_set_error_message(context, save_errno,
 324                                    "recvfrom %s: %s",
 325                                    host, strerror(save_errno));
 326             return save_errno;
 327         }
 328         len = ret;
 329     }
 330
 331     if (len < 6) {
 332         str2data (result_string, "server %s sent to too short message "
 333                   "(%llu bytes)", host, (unsigned long long)len);
 334         *result_code = KRB5_KPASSWD_MALFORMED;
 335         return 0;
 336     }
 337
 338     pkt_len = (reply[0] << 8) | (reply[1]);
 339     pkt_ver = (reply[2] << 8) | (reply[3]);
 340
 341     if ((pkt_len != len) || (reply[1] == 0x7e || reply[1] == 0x5e)) {
 342         KRB_ERROR error;
 343         size_t size;
 344         u_char *p;
 345
 346         memset(&error, 0, sizeof(error));
 347
 348         ret = decode_KRB_ERROR(reply, len, &error, &size);
 349         if (ret)
 350             return ret;
 351
 352         if (error.e_data->length < 2) {
 353             str2data(result_string, "server %s sent too short "
 354                      "e_data to print anything usable", host);
 355             free_KRB_ERROR(&error);
 356             *result_code = KRB5_KPASSWD_MALFORMED;
 357             return 0;
 358         }
 359
 360         p = error.e_data->data;
 361         *result_code = (p[0] << 8) | p[1];
 362         if (error.e_data->length == 2)
 363             str2data(result_string, "server only sent error code");
 364         else
 365             krb5_data_copy (result_string,
 366                             p + 2,
 367                             error.e_data->length - 2);
 368         free_KRB_ERROR(&error);
 369         return 0;
 370     }
 371
 372     if (pkt_len != len) {
 373         str2data (result_string, "client: wrong len in reply");
 374         *result_code = KRB5_KPASSWD_MALFORMED;
 375         return 0;
 376     }
 377     if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW) {
 378         str2data (result_string,
 379                   "client: wrong version number (%d)", pkt_ver);
 380         *result_code = KRB5_KPASSWD_MALFORMED;
 381         return 0;
 382     }
 383
 384     ap_rep_data.data = reply + 6;
 385     ap_rep_data.length  = (reply[4] << 8) | (reply[5]);
 386
 387     if (reply + len < (u_char *)ap_rep_data.data + ap_rep_data.length) {
 388         str2data (result_string, "client: wrong AP len in reply");
 389         *result_code = KRB5_KPASSWD_MALFORMED;
 390         return 0;
 391     }
 392
 393     if (ap_rep_data.length) {
 394         krb5_ap_rep_enc_part *ap_rep;
 395         krb5_data priv_data;
 396         u_char *p;
 397
 398         priv_data.data   = (u_char*)ap_rep_data.data + ap_rep_data.length;
 399         priv_data.length = len - ap_rep_data.length - 6;
 400
 401         ret = krb5_rd_rep (context,
 402                            auth_context,
 403                            &ap_rep_data,
 404                            &ap_rep);
 405         if (ret)
 406             return ret;
 407
 408         krb5_free_ap_rep_enc_part (context, ap_rep);
 409
 410         ret = krb5_rd_priv (context,
 411                             auth_context,
 412                             &priv_data,
 413                             result_code_string,
 414                             NULL);
 415         if (ret) {
 416             krb5_data_free (result_code_string);
 417             return ret;
 418         }
 419
 420         if (result_code_string->length < 2) {
 421             *result_code = KRB5_KPASSWD_MALFORMED;
 422             str2data (result_string,
 423                       "client: bad length in result");
 424             return 0;
 425         }
 426
 427         p = result_code_string->data;
 428
 429         *result_code = (p[0] << 8) | p[1];
 430         krb5_data_copy (result_string,
 431                         (unsigned char*)result_code_string->data + 2,
 432                         result_code_string->length - 2);
 433         return 0;
 434     } else {
 435         KRB_ERROR error;
 436         size_t size;
 437         u_char *p;
 438
 439         ret = decode_KRB_ERROR(reply + 6, len - 6, &error, &size);
 440         if (ret) {
 441             return ret;
 442         }
 443         if (error.e_data->length < 2) {
 444             krb5_warnx (context, "too short e_data to print anything usable");
 445             return 1;           /* XXX */
 446         }
 447
 448         p = error.e_data->data;
 449         *result_code = (p[0] << 8) | p[1];
 450         krb5_data_copy (result_string,
 451                         p + 2,
 452                         error.e_data->length - 2);
 453         return 0;
 454     }
 455 }
 456
 457
 458 /*
 459  * change the password using the credentials in `creds' (for the
 460  * principal indicated in them) to `newpw', storing the result of
 461  * the operation in `result_*' and an error code or 0.
 462  */
 463
 464 typedef krb5_error_code (*kpwd_send_request) (krb5_context,
 465                                               krb5_auth_context *,
 466                                               krb5_creds *,
 467                                               krb5_principal,
 468                                               int,
 469                                               rk_socket_t,
 470                                               const char *,
 471                                               const char *);
 472 typedef krb5_error_code (*kpwd_process_reply) (krb5_context,
 473                                                krb5_auth_context,
 474                                                int,
 475                                                rk_socket_t,
 476                                                int *,
 477                                                krb5_data *,
 478                                                krb5_data *,
 479                                                const char *);
 480
 481 static struct kpwd_proc {
 482     const char *name;
 483     int flags;
 484 #define SUPPORT_TCP     1
 485 #define SUPPORT_UDP     2
 486     kpwd_send_request send_req;
 487     kpwd_process_reply process_rep;
 488 } procs[] = {
 489     {
 490         "MS set password",
 491         SUPPORT_TCP|SUPPORT_UDP,
 492         setpw_send_request,
 493         process_reply
 494     },
 495     {
 496         "change password",
 497         SUPPORT_UDP,
 498         chgpw_send_request,
 499         process_reply
 500     },
 501     { NULL, 0, NULL, NULL }
 502 };
 503
 504 /*
 505  *
 506  */
 507
 508 static krb5_error_code
 509 change_password_loop (krb5_context      context,
 510                       krb5_creds        *creds,
 511                       krb5_principal    targprinc,
 512                       const char        *newpw,
 513                       int               *result_code,
 514                       krb5_data         *result_code_string,
 515                       krb5_data         *result_string,
 516                       struct kpwd_proc  *proc)
 517 {
 518     krb5_error_code ret;
 519     krb5_auth_context auth_context = NULL;
 520     krb5_krbhst_handle handle = NULL;
 521     krb5_krbhst_info *hi;
 522     rk_socket_t sock;
 523     unsigned int i;
 524     int done = 0;
 525     krb5_realm realm;
 526
 527     if (targprinc)
 528         realm = targprinc->realm;
 529     else
 530         realm = creds->client->realm;
 531
 532     ret = krb5_auth_con_init (context, &auth_context);
 533     if (ret)
 534         return ret;
 535
 536     krb5_auth_con_setflags (context, auth_context,
 537                             KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 538
 539     ret = krb5_krbhst_init (context, realm, KRB5_KRBHST_CHANGEPW, &handle);
 540     if (ret)
 541         goto out;
 542
 543     while (!done && (ret = krb5_krbhst_next(context, handle, &hi)) == 0) {
 544         struct addrinfo *ai, *a;
 545         int is_stream;
 546
 547         switch (hi->proto) {
 548         case KRB5_KRBHST_UDP:
 549             if ((proc->flags & SUPPORT_UDP) == 0)
 550                 continue;
 551             is_stream = 0;
 552             break;
 553         case KRB5_KRBHST_TCP:
 554             if ((proc->flags & SUPPORT_TCP) == 0)
 555                 continue;
 556             is_stream = 1;
 557             break;
 558         default:
 559             continue;
 560         }
 561
 562         ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
 563         if (ret)
 564             continue;
 565
 566         for (a = ai; !done && a != NULL; a = a->ai_next) {
 567             int replied = 0;
 568
 569             sock = socket (a->ai_family, a->ai_socktype | SOCK_CLOEXEC, a->ai_protocol);
 570             if (rk_IS_BAD_SOCKET(sock))
 571                 continue;
 572             rk_cloexec(sock);
 573
 574             ret = connect(sock, a->ai_addr, a->ai_addrlen);
 575             if (rk_IS_SOCKET_ERROR(ret)) {
 576                 rk_closesocket (sock);
 577                 goto out;
 578             }
 579
 580             ret = krb5_auth_con_genaddrs (context, auth_context, sock,
 581                                           KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR);
 582             if (ret) {
 583                 rk_closesocket (sock);
 584                 goto out;
 585             }
 586
 587             for (i = 0; !done && i < 5; ++i) {
 588                 fd_set fdset;
 589                 struct timeval tv;
 590
 591                 if (!replied) {
 592                     replied = 0;
 593
 594                     ret = (*proc->send_req) (context,
 595                                              &auth_context,
 596                                              creds,
 597                                              targprinc,
 598                                              is_stream,
 599                                              sock,
 600                                              newpw,
 601                                              hi->hostname);
 602                     if (ret) {
 603                         rk_closesocket(sock);
 604                         goto out;
 605                     }
 606                 }
 607
 608 #ifndef NO_LIMIT_FD_SETSIZE
 609                 if (sock >= FD_SETSIZE) {
 610                     ret = ERANGE;
 611                     krb5_set_error_message(context, ret,
 612                                            "fd %d too large", sock);
 613                     rk_closesocket (sock);
 614                     goto out;
 615                 }
 616 #endif
 617
 618                 FD_ZERO(&fdset);
 619                 FD_SET(sock, &fdset);
 620                 tv.tv_usec = 0;
 621                 tv.tv_sec  = 1 + (1 << i);
 622
 623                 ret = select (sock + 1, &fdset, NULL, NULL, &tv);
 624                 if (rk_IS_SOCKET_ERROR(ret) && rk_SOCK_ERRNO != EINTR) {
 625                     rk_closesocket(sock);
 626                     goto out;
 627                 }
 628                 if (ret == 1) {
 629                     ret = (*proc->process_rep) (context,
 630                                                 auth_context,
 631                                                 is_stream,
 632                                                 sock,
 633                                                 result_code,
 634                                                 result_code_string,
 635                                                 result_string,
 636                                                 hi->hostname);
 637                     if (ret == 0)
 638                         done = 1;
 639                     else if (i > 0 && ret == KRB5KRB_AP_ERR_MUT_FAIL)
 640                         replied = 1;
 641                 } else {
 642                     ret = KRB5_KDC_UNREACH;
 643                 }
 644             }
 645             rk_closesocket (sock);
 646         }
 647     }
 648
 649  out:
 650     krb5_krbhst_free (context, handle);
 651     krb5_auth_con_free (context, auth_context);
 652
 653     if (ret == KRB5_KDC_UNREACH) {
 654         krb5_set_error_message(context,
 655                                ret,
 656                                N_("Unable to reach any changepw server "
 657                                  " in realm %s", "realm"), realm);
 658         *result_code = KRB5_KPASSWD_HARDERROR;
 659     }
 660     return ret;
 661 }
 662
 663 #ifndef HEIMDAL_SMALLER
 664
 665 static struct kpwd_proc *
 666 find_chpw_proto(const char *name)
 667 {
 668     struct kpwd_proc *p;
 669     for (p = procs; p->name != NULL; p++) {
 670         if (strcmp(p->name, name) == 0)
 671             return p;
 672     }
 673     return NULL;
 674 }
 675
 676 /**
 677  * Deprecated: krb5_change_password() is deprecated, use krb5_set_password().
 678  *
 679  * @param context a Keberos context
 680  * @param creds
 681  * @param newpw
 682  * @param result_code
 683  * @param result_code_string
 684  * @param result_string
 685  *
 686  * @return On sucess password is changed.
 687
 688  * @ingroup @krb5_deprecated
 689  */
 690
 691 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 692 krb5_change_password (krb5_context      context,
 693                       krb5_creds        *creds,
 694                       const char        *newpw,
 695                       int               *result_code,
 696                       krb5_data         *result_code_string,
 697                       krb5_data         *result_string)
 698     KRB5_DEPRECATED_FUNCTION("Use X instead")
 699 {
 700     struct kpwd_proc *p = find_chpw_proto("change password");
 701
 702     *result_code = KRB5_KPASSWD_MALFORMED;
 703     result_code_string->data = result_string->data = NULL;
 704     result_code_string->length = result_string->length = 0;
 705
 706     if (p == NULL)
 707         return KRB5_KPASSWD_MALFORMED;
 708
 709     return change_password_loop(context, creds, NULL, newpw,
 710                                 result_code, result_code_string,
 711                                 result_string, p);
 712 }
 713 #endif /* HEIMDAL_SMALLER */
 714
 715 /**
 716  * Change password using creds.
 717  *
 718  * @param context a Keberos context
 719  * @param creds The initial kadmin/passwd for the principal or an admin principal
 720  * @param newpw The new password to set
 721  * @param targprinc if unset, the default principal is used.
 722  * @param result_code Result code, KRB5_KPASSWD_SUCCESS is when password is changed.
 723  * @param result_code_string binary message from the server, contains
 724  * at least the result_code.
 725  * @param result_string A message from the kpasswd service or the
 726  * library in human printable form. The string is NUL terminated.
 727  *
 728  * @return On sucess and *result_code is KRB5_KPASSWD_SUCCESS, the password is changed.
 729
 730  * @ingroup @krb5
 731  */
 732
 733 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 734 krb5_set_password(krb5_context context,
 735                   krb5_creds *creds,
 736                   const char *newpw,
 737                   krb5_principal targprinc,
 738                   int *result_code,
 739                   krb5_data *result_code_string,
 740                   krb5_data *result_string)
 741 {
 742     krb5_principal principal = NULL;
 743     krb5_error_code ret = 0;
 744     int i;
 745
 746     *result_code = KRB5_KPASSWD_MALFORMED;
 747     krb5_data_zero(result_code_string);
 748     krb5_data_zero(result_string);
 749
 750     if (targprinc == NULL) {
 751         ret = krb5_get_default_principal(context, &principal);
 752         if (ret)
 753             return ret;
 754     } else
 755         principal = targprinc;
 756
 757     for (i = 0; procs[i].name != NULL; i++) {
 758         *result_code = 0;
 759         ret = change_password_loop(context, creds, principal, newpw,
 760                                    result_code, result_code_string,
 761                                    result_string,
 762                                    &procs[i]);
 763         if (ret == 0 && *result_code == 0)
 764             break;
 765     }
 766
 767     if (targprinc == NULL)
 768         krb5_free_principal(context, principal);
 769     return ret;
 770 }
 771
 772 /*
 773  *
 774  */
 775
 776 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 777 krb5_set_password_using_ccache(krb5_context context,
 778                                krb5_ccache ccache,
 779                                const char *newpw,
 780                                krb5_principal targprinc,
 781                                int *result_code,
 782                                krb5_data *result_code_string,
 783                                krb5_data *result_string)
 784 {
 785     krb5_creds creds, *credsp;
 786     krb5_error_code ret;
 787     krb5_principal principal = NULL;
 788
 789     *result_code = KRB5_KPASSWD_MALFORMED;
 790     result_code_string->data = result_string->data = NULL;
 791     result_code_string->length = result_string->length = 0;
 792
 793     memset(&creds, 0, sizeof(creds));
 794
 795     if (targprinc == NULL) {
 796         ret = krb5_cc_get_principal(context, ccache, &principal);
 797         if (ret)
 798             return ret;
 799     } else
 800         principal = targprinc;
 801
 802     ret = krb5_make_principal(context, &creds.server,
 803                               krb5_principal_get_realm(context, principal),
 804                               "kadmin", "changepw", NULL);
 805     if (ret)
 806         goto out;
 807
 808     ret = krb5_cc_get_principal(context, ccache, &creds.client);
 809     if (ret) {
 810         krb5_free_principal(context, creds.server);
 811         goto out;
 812     }
 813
 814     ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
 815     krb5_free_principal(context, creds.server);
 816     krb5_free_principal(context, creds.client);
 817     if (ret)
 818         goto out;
 819
 820     ret = krb5_set_password(context,
 821                             credsp,
 822                             newpw,
 823                             principal,
 824                             result_code,
 825                             result_code_string,
 826                             result_string);
 827
 828     krb5_free_creds(context, credsp);
 829
 830     return ret;
 831  out:
 832     if (targprinc == NULL)
 833         krb5_free_principal(context, principal);
 834     return ret;
 835 }
 836
 837 /*
 838  *
 839  */
 840
 841 KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
 842 krb5_passwd_result_to_string (krb5_context context,
 843                               int result)
 844 {
 845     static const char *strings[] = {
 846         "Success",
 847         "Malformed",
 848         "Hard error",
 849         "Auth error",
 850         "Soft error" ,
 851         "Access denied",
 852         "Bad version",
 853         "Initial flag needed"
 854     };
 855
 856     if (result < 0 || result > KRB5_KPASSWD_INITIAL_FLAG_NEEDED)
 857         return "unknown result code";
 858     else
 859         return strings[result];
 860 }