kadmin/rpc.c

   1 /*
   2  * Copyright (c) 2008 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 "kadmin_locl.h"
  35
  36 #include <gssapi.h>
  37 #include <gssapi_krb5.h>
  38 #include <gssapi_spnego.h>
  39
  40 #define CHECK(x)                                                        \
  41         do {                                                            \
  42                 int __r;                                                \
  43                 if ((__r = (x))) {                                      \
  44                         krb5_errx(dcontext, 1, "Failed (%d) on %s:%d",  \
  45                             __r, __FILE__, __LINE__);                   \
  46                 }                                                       \
  47         } while(0)
  48
  49 static krb5_context dcontext;
  50
  51 #define INSIST(x) CHECK(!(x))
  52
  53 #define VERSION2 0x12345702
  54
  55 #define LAST_FRAGMENT 0x80000000
  56
  57 #define RPC_VERSION 2
  58 #define KADM_SERVER 2112
  59 #define VVERSION 2
  60 #define FLAVOR_GSS 6
  61 #define FLAVOR_GSS_VERSION 1
  62
  63 struct opaque_auth {
  64     uint32_t flavor;
  65     krb5_data data;
  66 };
  67
  68 struct call_header {
  69     uint32_t xid;
  70     uint32_t rpcvers;
  71     uint32_t prog;
  72     uint32_t vers;
  73     uint32_t proc;
  74     struct opaque_auth cred;
  75     struct opaque_auth verf;
  76 };
  77
  78 enum {
  79     RPG_DATA = 0,
  80     RPG_INIT = 1,
  81     RPG_CONTINUE_INIT = 2,
  82     RPG_DESTROY = 3
  83 };
  84
  85 enum {
  86     rpg_privacy = 3
  87 };
  88
  89 /*
  90 struct chrand_ret {
  91         krb5_ui_4 api_version;
  92         kadm5_ret_t ret;
  93         int n_keys;
  94         krb5_keyblock *keys;
  95 };
  96 */
  97
  98
  99 struct gcred {
 100     uint32_t version;
 101     uint32_t proc;
 102     uint32_t seq_num;
 103     uint32_t service;
 104     krb5_data handle;
 105 };
 106
 107 static int
 108 parse_name(const unsigned char *p, size_t len,
 109            const gss_OID oid, char **name)
 110 {
 111     size_t l;
 112
 113     if (len < 4)
 114         return 1;
 115
 116     /* TOK_ID */
 117     if (memcmp(p, "\x04\x01", 2) != 0)
 118         return 1;
 119     len -= 2;
 120     p += 2;
 121
 122     /* MECH_LEN */
 123     l = (p[0] << 8) | p[1];
 124     len -= 2;
 125     p += 2;
 126     if (l < 2 || len < l)
 127         return 1;
 128
 129     /* oid wrapping */
 130     if (p[0] != 6 || p[1] != l - 2)
 131         return 1;
 132     p += 2;
 133     l -= 2;
 134     len -= 2;
 135
 136     /* MECH */
 137     if (l != oid->length || memcmp(p, oid->elements, oid->length) != 0)
 138         return 1;
 139     len -= l;
 140     p += l;
 141
 142     /* MECHNAME_LEN */
 143     if (len < 4)
 144         return 1;
 145     l = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
 146     len -= 4;
 147     p += 4;
 148
 149     /* MECH NAME */
 150     if (len != l)
 151         return 1;
 152
 153     *name = malloc(l + 1);
 154     INSIST(*name != NULL);
 155     memcpy(*name, p, l);
 156     (*name)[l] = '\0';
 157
 158     return 0;
 159 }
 160
 161
 162
 163 static void
 164 gss_error(krb5_context context,
 165           gss_OID mech, OM_uint32 type, OM_uint32 error)
 166 {
 167     OM_uint32 new_stat;
 168     OM_uint32 msg_ctx = 0;
 169     gss_buffer_desc status_string;
 170     OM_uint32 ret;
 171
 172     do {
 173         ret = gss_display_status (&new_stat,
 174                                   error,
 175                                   type,
 176                                   mech,
 177                                   &msg_ctx,
 178                                   &status_string);
 179         krb5_warnx(context, "%.*s",
 180                    (int)status_string.length,
 181                    (char *)status_string.value);
 182         gss_release_buffer (&new_stat, &status_string);
 183     } while (!GSS_ERROR(ret) && msg_ctx != 0);
 184 }
 185
 186 static void
 187 gss_print_errors (krb5_context context,
 188                   OM_uint32 maj_stat, OM_uint32 min_stat)
 189 {
 190     gss_error(context, GSS_C_NO_OID, GSS_C_GSS_CODE, maj_stat);
 191     gss_error(context, GSS_C_NO_OID, GSS_C_MECH_CODE, min_stat);
 192 }
 193
 194 static int
 195 read_data(krb5_storage *sp, krb5_storage *msg, size_t len)
 196 {
 197     char buf[1024];
 198
 199     while (len) {
 200         size_t tlen = len;
 201         ssize_t slen;
 202
 203         if (tlen > sizeof(buf))
 204             tlen = sizeof(buf);
 205
 206         slen = krb5_storage_read(sp, buf, tlen);
 207         INSIST(slen == tlen);
 208
 209         slen = krb5_storage_write(msg, buf, tlen);
 210         INSIST(slen == tlen);
 211
 212         len -= tlen;
 213     }
 214     return 0;
 215 }
 216
 217 static int
 218 collect_framents(krb5_storage *sp, krb5_storage *msg)
 219 {
 220     krb5_error_code ret;
 221     uint32_t len;
 222     int last_fragment;
 223     size_t total_len = 0;
 224
 225     do {
 226         ret = krb5_ret_uint32(sp, &len);
 227         if (ret)
 228             return ret;
 229
 230         last_fragment = (len & LAST_FRAGMENT);
 231         len &= ~LAST_FRAGMENT;
 232
 233         CHECK(read_data(sp, msg, len));
 234         total_len += len;
 235
 236     } while(!last_fragment || total_len == 0);
 237
 238     return 0;
 239 }
 240
 241 static krb5_error_code
 242 store_data_xdr(krb5_storage *sp, krb5_data data)
 243 {
 244     krb5_error_code ret;
 245     size_t res;
 246
 247     ret = krb5_store_data(sp, data);
 248     if (ret)
 249         return ret;
 250     res = 4 - (data.length % 4);
 251     if (res != 4) {
 252         static const char zero[4] = { 0, 0, 0, 0 };
 253
 254         ret = krb5_storage_write(sp, zero, res);
 255         if(ret != res)
 256             return (ret < 0)? errno : krb5_storage_get_eof_code(sp);
 257     }
 258     return 0;
 259 }
 260
 261 static krb5_error_code
 262 ret_data_xdr(krb5_storage *sp, krb5_data *data)
 263 {
 264     krb5_error_code ret;
 265     ret = krb5_ret_data(sp, data);
 266     if (ret)
 267         return ret;
 268
 269     if ((data->length % 4) != 0) {
 270         char buf[4];
 271         size_t res;
 272
 273         res = 4 - (data->length % 4);
 274         if (res != 4) {
 275             ret = krb5_storage_read(sp, buf, res);
 276             if(ret != res)
 277                 return (ret < 0)? errno : krb5_storage_get_eof_code(sp);
 278         }
 279     }
 280     return 0;
 281 }
 282
 283 static krb5_error_code
 284 ret_auth_opaque(krb5_storage *msg, struct opaque_auth *ao)
 285 {
 286     krb5_error_code ret;
 287     ret = krb5_ret_uint32(msg, &ao->flavor);
 288     if (ret) return ret;
 289     ret = ret_data_xdr(msg, &ao->data);
 290     return ret;
 291 }
 292
 293 static int
 294 ret_gcred(krb5_data *data, struct gcred *gcred)
 295 {
 296     krb5_storage *sp;
 297
 298     memset(gcred, 0, sizeof(*gcred));
 299
 300     sp = krb5_storage_from_data(data);
 301     INSIST(sp != NULL);
 302
 303     CHECK(krb5_ret_uint32(sp, &gcred->version));
 304     CHECK(krb5_ret_uint32(sp, &gcred->proc));
 305     CHECK(krb5_ret_uint32(sp, &gcred->seq_num));
 306     CHECK(krb5_ret_uint32(sp, &gcred->service));
 307     CHECK(ret_data_xdr(sp, &gcred->handle));
 308
 309     krb5_storage_free(sp);
 310
 311     return 0;
 312 }
 313
 314 static krb5_error_code
 315 store_gss_init_res(krb5_storage *sp, krb5_data handle,
 316                    OM_uint32 maj_stat, OM_uint32 min_stat,
 317                    uint32_t seq_window, gss_buffer_t gout)
 318 {
 319     krb5_error_code ret;
 320     krb5_data out;
 321
 322     out.data = gout->value;
 323     out.length = gout->length;
 324
 325     ret = store_data_xdr(sp, handle);
 326     if (ret) return ret;
 327     ret = krb5_store_uint32(sp, maj_stat);
 328     if (ret) return ret;
 329     ret = krb5_store_uint32(sp, min_stat);
 330     if (ret) return ret;
 331     ret = store_data_xdr(sp, out);
 332     return ret;
 333 }
 334
 335 static int
 336 store_string_xdr(krb5_storage *sp, const char *str)
 337 {
 338     krb5_data c;
 339     if (str) {
 340         c.data = rk_UNCONST(str);
 341         c.length = strlen(str) + 1;
 342     } else
 343         krb5_data_zero(&c);
 344
 345     return store_data_xdr(sp, c);
 346 }
 347
 348 static int
 349 ret_string_xdr(krb5_storage *sp, char **str)
 350 {
 351     krb5_data c;
 352     *str = NULL;
 353     CHECK(ret_data_xdr(sp, &c));
 354     if (c.length) {
 355         *str = malloc(c.length + 1);
 356         INSIST(*str != NULL);
 357         memcpy(*str, c.data, c.length);
 358         (*str)[c.length] = '\0';
 359     }
 360     krb5_data_free(&c);
 361     return 0;
 362 }
 363
 364 static int
 365 store_principal_xdr(krb5_context context,
 366                     krb5_storage *sp,
 367                     krb5_principal p)
 368 {
 369     char *str;
 370     CHECK(krb5_unparse_name(context, p, &str));
 371     CHECK(store_string_xdr(sp, str));
 372     free(str);
 373     return 0;
 374 }
 375
 376 static int
 377 ret_principal_xdr(krb5_context context,
 378                   krb5_storage *sp,
 379                   krb5_principal *p)
 380 {
 381     char *str;
 382     *p = NULL;
 383     CHECK(ret_string_xdr(sp, &str));
 384     if (str) {
 385         CHECK(krb5_parse_name(context, str, p));
 386         free(str);
 387     }
 388     return 0;
 389 }
 390
 391 static int
 392 store_principal_ent(krb5_context context,
 393                     krb5_storage *sp,
 394                     kadm5_principal_ent_rec *ent)
 395 {
 396     size_t i;
 397
 398     CHECK(store_principal_xdr(context, sp, ent->principal));
 399     CHECK(krb5_store_uint32(sp, ent->princ_expire_time));
 400     CHECK(krb5_store_uint32(sp, ent->pw_expiration));
 401     CHECK(krb5_store_uint32(sp, ent->last_pwd_change));
 402     CHECK(krb5_store_uint32(sp, ent->max_life));
 403     CHECK(krb5_store_int32(sp, ent->mod_name == NULL));
 404     if (ent->mod_name)
 405         CHECK(store_principal_xdr(context, sp, ent->mod_name));
 406     CHECK(krb5_store_uint32(sp, ent->mod_date));
 407     CHECK(krb5_store_uint32(sp, ent->attributes));
 408     CHECK(krb5_store_uint32(sp, ent->kvno));
 409     CHECK(krb5_store_uint32(sp, ent->mkvno));
 410     CHECK(store_string_xdr(sp, ent->policy));
 411     CHECK(krb5_store_int32(sp, ent->aux_attributes));
 412     CHECK(krb5_store_int32(sp, ent->max_renewable_life));
 413     CHECK(krb5_store_int32(sp, ent->last_success));
 414     CHECK(krb5_store_int32(sp, ent->last_failed));
 415     CHECK(krb5_store_int32(sp, ent->fail_auth_count));
 416     CHECK(krb5_store_int32(sp, ent->n_key_data));
 417     CHECK(krb5_store_int32(sp, ent->n_tl_data));
 418     CHECK(krb5_store_int32(sp, ent->n_tl_data == 0));
 419     if (ent->n_tl_data) {
 420         krb5_tl_data *tp;
 421
 422         for (tp = ent->tl_data; tp; tp = tp->tl_data_next) {
 423             krb5_data c;
 424             c.length = tp->tl_data_length;
 425             c.data = tp->tl_data_contents;
 426
 427             CHECK(krb5_store_int32(sp, 0)); /* last item */
 428             CHECK(krb5_store_int32(sp, tp->tl_data_type));
 429             CHECK(store_data_xdr(sp, c));
 430         }
 431         CHECK(krb5_store_int32(sp, 1)); /* last item */
 432     }
 433
 434     CHECK(krb5_store_int32(sp, ent->n_key_data));
 435     for (i = 0; i < ent->n_key_data; i++) {
 436         CHECK(krb5_store_uint32(sp, 2));
 437         CHECK(krb5_store_uint32(sp, ent->kvno));
 438         CHECK(krb5_store_uint32(sp, ent->key_data[i].key_data_type[0]));
 439         CHECK(krb5_store_uint32(sp, ent->key_data[i].key_data_type[1]));
 440     }
 441
 442     return 0;
 443 }
 444
 445 static int
 446 ret_principal_ent(krb5_context context,
 447                   krb5_storage *sp,
 448                   kadm5_principal_ent_rec *ent)
 449 {
 450     uint32_t flag, num;
 451     size_t i;
 452
 453     memset(ent, 0, sizeof(*ent));
 454
 455     CHECK(ret_principal_xdr(context, sp, &ent->principal));
 456     CHECK(krb5_ret_uint32(sp, &flag));
 457     ent->princ_expire_time = flag;
 458     CHECK(krb5_ret_uint32(sp, &flag));
 459     ent->pw_expiration = flag;
 460     CHECK(krb5_ret_uint32(sp, &flag));
 461     ent->last_pwd_change = flag;
 462     CHECK(krb5_ret_uint32(sp, &flag));
 463     ent->max_life = flag;
 464     CHECK(krb5_ret_uint32(sp, &flag));
 465     if (flag == 0)
 466         ret_principal_xdr(context, sp, &ent->mod_name);
 467     CHECK(krb5_ret_uint32(sp, &flag));
 468     ent->mod_date = flag;
 469     CHECK(krb5_ret_uint32(sp, &flag));
 470     ent->attributes = flag;
 471     CHECK(krb5_ret_uint32(sp, &flag));
 472     ent->kvno = flag;
 473     CHECK(krb5_ret_uint32(sp, &flag));
 474     ent->mkvno = flag;
 475     CHECK(ret_string_xdr(sp, &ent->policy));
 476     CHECK(krb5_ret_uint32(sp, &flag));
 477     ent->aux_attributes = flag;
 478     CHECK(krb5_ret_uint32(sp, &flag));
 479     ent->max_renewable_life = flag;
 480     CHECK(krb5_ret_uint32(sp, &flag));
 481     ent->last_success = flag;
 482     CHECK(krb5_ret_uint32(sp, &flag));
 483     ent->last_failed = flag;
 484     CHECK(krb5_ret_uint32(sp, &flag));
 485     ent->fail_auth_count = flag;
 486     CHECK(krb5_ret_uint32(sp, &flag));
 487     ent->n_key_data = flag;
 488     CHECK(krb5_ret_uint32(sp, &flag));
 489     ent->n_tl_data = flag;
 490     CHECK(krb5_ret_uint32(sp, &flag));
 491     if (flag == 0) {
 492         krb5_tl_data **tp = &ent->tl_data;
 493         size_t count = 0;
 494
 495         while(1) {
 496             krb5_data c;
 497             CHECK(krb5_ret_uint32(sp, &flag)); /* last item */
 498             if (flag)
 499                 break;
 500             *tp = calloc(1, sizeof(**tp));
 501             INSIST(*tp != NULL);
 502             CHECK(krb5_ret_uint32(sp, &flag));
 503             (*tp)->tl_data_type = flag;
 504             CHECK(ret_data_xdr(sp, &c));
 505             (*tp)->tl_data_length = c.length;
 506             (*tp)->tl_data_contents = c.data;
 507             tp = &(*tp)->tl_data_next;
 508
 509             count++;
 510         }
 511         INSIST(ent->n_tl_data == count);
 512     } else {
 513         INSIST(ent->n_tl_data == 0);
 514     }
 515
 516     CHECK(krb5_ret_uint32(sp, &num));
 517     INSIST(num == ent->n_key_data);
 518
 519     ent->key_data = calloc(num, sizeof(ent->key_data[0]));
 520     INSIST(ent->key_data != NULL);
 521
 522     for (i = 0; i < num; i++) {
 523         CHECK(krb5_ret_uint32(sp, &flag)); /* data version */
 524         INSIST(flag > 1);
 525         CHECK(krb5_ret_uint32(sp, &flag));
 526         ent->kvno = flag;
 527         CHECK(krb5_ret_uint32(sp, &flag));
 528         ent->key_data[i].key_data_type[0] = flag;
 529         CHECK(krb5_ret_uint32(sp, &flag));
 530         ent->key_data[i].key_data_type[1] = flag;
 531     }
 532
 533     return 0;
 534 }
 535
 536 /*
 537  *
 538  */
 539
 540 static void
 541 proc_create_principal(kadm5_server_context *context,
 542                       krb5_storage *in,
 543                       krb5_storage *out)
 544 {
 545     uint32_t version, mask;
 546     kadm5_principal_ent_rec ent;
 547     krb5_error_code ret;
 548     char *password;
 549
 550     memset(&ent, 0, sizeof(ent));
 551
 552     CHECK(krb5_ret_uint32(in, &version));
 553     INSIST(version == VERSION2);
 554     CHECK(ret_principal_ent(context->context, in, &ent));
 555     CHECK(krb5_ret_uint32(in, &mask));
 556     CHECK(ret_string_xdr(in, &password));
 557
 558     INSIST(ent.principal);
 559
 560
 561     ret = _kadm5_acl_check_permission(context, KADM5_PRIV_ADD, ent.principal);
 562     if (ret)
 563         goto fail;
 564
 565     ret = kadm5_create_principal(context, &ent, mask, password);
 566
 567  fail:
 568     krb5_warn(context->context, ret, "create principal");
 569     CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
 570     CHECK(krb5_store_uint32(out, ret)); /* code */
 571
 572     free(password);
 573     kadm5_free_principal_ent(context, &ent);
 574 }
 575
 576 static void
 577 proc_delete_principal(kadm5_server_context *context,
 578                       krb5_storage *in,
 579                       krb5_storage *out)
 580 {
 581     uint32_t version;
 582     krb5_principal princ;
 583     krb5_error_code ret;
 584
 585     CHECK(krb5_ret_uint32(in, &version));
 586     INSIST(version == VERSION2);
 587     CHECK(ret_principal_xdr(context->context, in, &princ));
 588
 589     ret = _kadm5_acl_check_permission(context, KADM5_PRIV_DELETE, princ);
 590     if (ret)
 591         goto fail;
 592
 593     ret = kadm5_delete_principal(context, princ);
 594
 595  fail:
 596     krb5_warn(context->context, ret, "delete principal");
 597     CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
 598     CHECK(krb5_store_uint32(out, ret)); /* code */
 599
 600     krb5_free_principal(context->context, princ);
 601 }
 602
 603 static void
 604 proc_get_principal(kadm5_server_context *context,
 605                    krb5_storage *in,
 606                    krb5_storage *out)
 607 {
 608     uint32_t version, mask;
 609     krb5_principal princ;
 610     kadm5_principal_ent_rec ent;
 611     krb5_error_code ret;
 612
 613     memset(&ent, 0, sizeof(ent));
 614
 615     CHECK(krb5_ret_uint32(in, &version));
 616     INSIST(version == VERSION2);
 617     CHECK(ret_principal_xdr(context->context, in, &princ));
 618     CHECK(krb5_ret_uint32(in, &mask));
 619
 620     ret = _kadm5_acl_check_permission(context, KADM5_PRIV_GET, princ);
 621     if(ret)
 622         goto fail;
 623
 624     ret = kadm5_get_principal(context, princ, &ent, mask);
 625
 626  fail:
 627     krb5_warn(context->context, ret, "get principal principal");
 628
 629     CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
 630     CHECK(krb5_store_uint32(out, ret)); /* code */
 631     if (ret == 0) {
 632         CHECK(store_principal_ent(context->context, out, &ent));
 633     }
 634     krb5_free_principal(context->context, princ);
 635     kadm5_free_principal_ent(context, &ent);
 636 }
 637
 638 static void
 639 proc_chrand_principal_v2(kadm5_server_context *context,
 640                          krb5_storage *in,
 641                          krb5_storage *out)
 642 {
 643     krb5_error_code ret;
 644     krb5_principal princ;
 645     uint32_t version;
 646     krb5_keyblock *new_keys;
 647     int n_keys;
 648
 649     CHECK(krb5_ret_uint32(in, &version));
 650     INSIST(version == VERSION2);
 651     CHECK(ret_principal_xdr(context->context, in, &princ));
 652
 653     ret = _kadm5_acl_check_permission(context, KADM5_PRIV_CPW, princ);
 654     if(ret)
 655         goto fail;
 656
 657     ret = kadm5_randkey_principal(context, princ,
 658                                   &new_keys, &n_keys);
 659
 660  fail:
 661     krb5_warn(context->context, ret, "rand key principal");
 662
 663     CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
 664     CHECK(krb5_store_uint32(out, ret));
 665     if (ret == 0) {
 666         size_t i;
 667         CHECK(krb5_store_int32(out, n_keys));
 668
 669         for(i = 0; i < n_keys; i++){
 670             CHECK(krb5_store_uint32(out, new_keys[i].keytype));
 671             CHECK(store_data_xdr(out, new_keys[i].keyvalue));
 672             krb5_free_keyblock_contents(context->context, &new_keys[i]);
 673         }
 674         free(new_keys);
 675     }
 676     krb5_free_principal(context->context, princ);
 677 }
 678
 679 static void
 680 proc_init(kadm5_server_context *context,
 681           krb5_storage *in,
 682           krb5_storage *out)
 683 {
 684     CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
 685     CHECK(krb5_store_uint32(out, 0)); /* code */
 686     CHECK(krb5_store_uint32(out, 0)); /* code */
 687 }
 688
 689 struct proc {
 690     char *name;
 691     void (*func)(kadm5_server_context *, krb5_storage *, krb5_storage *);
 692 } procs[] = {
 693     { "NULL", NULL },
 694     { "create principal", proc_create_principal },
 695     { "delete principal", proc_delete_principal },
 696     { "modify principal", NULL },
 697     { "rename principal", NULL },
 698     { "get principal", proc_get_principal },
 699     { "chpass principal", NULL },
 700     { "chrand principal", proc_chrand_principal_v2 },
 701     { "create policy", NULL },
 702     { "delete policy", NULL },
 703     { "modify policy", NULL },
 704     { "get policy", NULL },
 705     { "get privs", NULL },
 706     { "init", proc_init },
 707     { "get principals", NULL },
 708     { "get polices", NULL },
 709     { "setkey principal", NULL },
 710     { "setkey principal v4", NULL },
 711     { "create principal v3", NULL },
 712     { "chpass principal v3", NULL },
 713     { "chrand principal v3", NULL },
 714     { "setkey principal v3", NULL }
 715 };
 716
 717 static krb5_error_code
 718 copyheader(krb5_storage *sp, krb5_data *data)
 719 {
 720     off_t off;
 721     ssize_t sret;
 722
 723     off = krb5_storage_seek(sp, 0, SEEK_CUR);
 724
 725     CHECK(krb5_data_alloc(data, off));
 726     INSIST(off == data->length);
 727     krb5_storage_seek(sp, 0, SEEK_SET);
 728     sret = krb5_storage_read(sp, data->data, data->length);
 729     INSIST(sret == off);
 730     INSIST(off == krb5_storage_seek(sp, 0, SEEK_CUR));
 731
 732     return 0;
 733 }
 734
 735 struct gctx {
 736     krb5_data handle;
 737     gss_ctx_id_t ctx;
 738     uint32_t seq_num;
 739     int done;
 740     int inprogress;
 741 };
 742
 743 static int
 744 process_stream(krb5_context context,
 745                unsigned char *buf, size_t ilen,
 746                krb5_storage *sp)
 747 {
 748     krb5_error_code ret;
 749     krb5_storage *msg, *reply, *dreply;
 750     OM_uint32 maj_stat, min_stat;
 751     gss_buffer_desc gin, gout;
 752     struct gctx gctx;
 753     void *server_handle = NULL;
 754
 755     memset(&gctx, 0, sizeof(gctx));
 756
 757     msg = krb5_storage_emem();
 758     reply = krb5_storage_emem();
 759     dreply = krb5_storage_emem();
 760
 761     /*
 762      * First packet comes partly from the caller
 763      */
 764
 765     INSIST(ilen >= 4);
 766
 767     while (1) {
 768         struct call_header chdr;
 769         struct gcred gcred;
 770         uint32_t mtype;
 771         krb5_data headercopy;
 772
 773         krb5_storage_truncate(dreply, 0);
 774         krb5_storage_truncate(reply, 0);
 775         krb5_storage_truncate(msg, 0);
 776
 777         krb5_data_zero(&headercopy);
 778         memset(&chdr, 0, sizeof(chdr));
 779         memset(&gcred, 0, sizeof(gcred));
 780
 781         /*
 782          * This is very icky to handle the the auto-detection between
 783          * the Heimdal protocol and the MIT ONC-RPC based protocol.
 784          */
 785
 786         if (ilen) {
 787             int last_fragment;
 788             unsigned long len;
 789             ssize_t slen;
 790             unsigned char tmp[4];
 791
 792             if (ilen < 4) {
 793                 memcpy(tmp, buf, ilen);
 794                 slen = krb5_storage_read(sp, tmp + ilen, sizeof(tmp) - ilen);
 795                 INSIST(slen == sizeof(tmp) - ilen);
 796
 797                 ilen = sizeof(tmp);
 798                 buf = tmp;
 799             }
 800             INSIST(ilen >= 4);
 801
 802             _krb5_get_int(buf, &len, 4);
 803             last_fragment = (len & LAST_FRAGMENT) != 0;
 804             len &= ~LAST_FRAGMENT;
 805
 806             ilen -= 4;
 807             buf += 4;
 808
 809             if (ilen) {
 810                 if (len < ilen) {
 811                     slen = krb5_storage_write(msg, buf, len);
 812                     INSIST(slen == len);
 813                     ilen -= len;
 814                     len = 0;
 815                 } else {
 816                     slen = krb5_storage_write(msg, buf, ilen);
 817                     INSIST(slen == ilen);
 818                     len -= ilen;
 819                 }
 820             }
 821
 822             CHECK(read_data(sp, msg, len));
 823
 824             if (!last_fragment) {
 825                 ret = collect_framents(sp, msg);
 826                 if (ret == HEIM_ERR_EOF)
 827                     krb5_errx(context, 0, "client disconnected");
 828                 INSIST(ret == 0);
 829             }
 830         } else {
 831
 832             ret = collect_framents(sp, msg);
 833             if (ret == HEIM_ERR_EOF)
 834                 krb5_errx(context, 0, "client disconnected");
 835             INSIST(ret == 0);
 836         }
 837         krb5_storage_seek(msg, 0, SEEK_SET);
 838
 839         CHECK(krb5_ret_uint32(msg, &chdr.xid));
 840         CHECK(krb5_ret_uint32(msg, &mtype));
 841         CHECK(krb5_ret_uint32(msg, &chdr.rpcvers));
 842         CHECK(krb5_ret_uint32(msg, &chdr.prog));
 843         CHECK(krb5_ret_uint32(msg, &chdr.vers));
 844         CHECK(krb5_ret_uint32(msg, &chdr.proc));
 845         CHECK(ret_auth_opaque(msg, &chdr.cred));
 846         CHECK(copyheader(msg, &headercopy));
 847         CHECK(ret_auth_opaque(msg, &chdr.verf));
 848
 849         INSIST(chdr.rpcvers == RPC_VERSION);
 850         INSIST(chdr.prog == KADM_SERVER);
 851         INSIST(chdr.vers == VVERSION);
 852         INSIST(chdr.cred.flavor == FLAVOR_GSS);
 853
 854         CHECK(ret_gcred(&chdr.cred.data, &gcred));
 855
 856         INSIST(gcred.version == FLAVOR_GSS_VERSION);
 857
 858         if (gctx.done) {
 859             INSIST(chdr.verf.flavor == FLAVOR_GSS);
 860
 861             /* from first byte to last of credential */
 862             gin.value = headercopy.data;
 863             gin.length = headercopy.length;
 864             gout.value = chdr.verf.data.data;
 865             gout.length = chdr.verf.data.length;
 866
 867             maj_stat = gss_verify_mic(&min_stat, gctx.ctx, &gin, &gout, NULL);
 868             INSIST(maj_stat == GSS_S_COMPLETE);
 869         }
 870
 871         switch(gcred.proc) {
 872         case RPG_DATA: {
 873             krb5_data data;
 874             int conf_state;
 875             uint32_t seq;
 876             krb5_storage *sp;
 877
 878             INSIST(gcred.service == rpg_privacy);
 879
 880             INSIST(gctx.done);
 881
 882             INSIST(krb5_data_cmp(&gcred.handle, &gctx.handle) == 0);
 883
 884             CHECK(ret_data_xdr(msg, &data));
 885
 886             gin.value = data.data;
 887             gin.length = data.length;
 888
 889             maj_stat = gss_unwrap(&min_stat, gctx.ctx, &gin, &gout,
 890                                   &conf_state, NULL);
 891             krb5_data_free(&data);
 892             INSIST(maj_stat == GSS_S_COMPLETE);
 893             INSIST(conf_state != 0);
 894
 895             sp = krb5_storage_from_mem(gout.value, gout.length);
 896             INSIST(sp != NULL);
 897
 898             CHECK(krb5_ret_uint32(sp, &seq));
 899             INSIST (seq == gcred.seq_num);
 900
 901             /*
 902              * Check sequence number
 903              */
 904             INSIST(seq > gctx.seq_num);
 905             gctx.seq_num = seq;
 906
 907             /*
 908              * If context is setup, priv data have the seq_num stored
 909              * first in the block, so add it here before users data is
 910              * added.
 911              */
 912             CHECK(krb5_store_uint32(dreply, gctx.seq_num));
 913
 914             if (chdr.proc >= sizeof(procs)/sizeof(procs[0])) {
 915                 krb5_warnx(context, "proc number out of array");
 916             } else if (procs[chdr.proc].func == NULL) {
 917                 krb5_warnx(context, "proc '%s' never implemented",
 918                           procs[chdr.proc].name);
 919             } else {
 920                 krb5_warnx(context, "proc %s", procs[chdr.proc].name);
 921                 INSIST(server_handle != NULL);
 922                 (*procs[chdr.proc].func)(server_handle, sp, dreply);
 923             }
 924             krb5_storage_free(sp);
 925             gss_release_buffer(&min_stat, &gout);
 926
 927             break;
 928         }
 929         case RPG_INIT:
 930             INSIST(gctx.inprogress == 0);
 931             INSIST(gctx.ctx == NULL);
 932
 933             gctx.inprogress = 1;
 934             /* FALL THOUGH */
 935         case RPG_CONTINUE_INIT: {
 936             gss_name_t src_name = GSS_C_NO_NAME;
 937             krb5_data in;
 938
 939             INSIST(gctx.inprogress);
 940
 941             CHECK(ret_data_xdr(msg, &in));
 942
 943             gin.value = in.data;
 944             gin.length = in.length;
 945             gout.value = NULL;
 946             gout.length = 0;
 947
 948             maj_stat = gss_accept_sec_context(&min_stat,
 949                                               &gctx.ctx,
 950                                               GSS_C_NO_CREDENTIAL,
 951                                               &gin,
 952                                               GSS_C_NO_CHANNEL_BINDINGS,
 953                                               &src_name,
 954                                               NULL,
 955                                               &gout,
 956                                               NULL,
 957                                               NULL,
 958                                               NULL);
 959             if (GSS_ERROR(maj_stat)) {
 960                 gss_print_errors(context, maj_stat, min_stat);
 961                 krb5_errx(context, 1, "gss error, exit");
 962             }
 963             if ((maj_stat & GSS_S_CONTINUE_NEEDED) == 0) {
 964                 kadm5_config_params realm_params;
 965                 gss_buffer_desc buf;
 966                 char *client;
 967
 968                 gctx.done = 1;
 969
 970                 memset(&realm_params, 0, sizeof(realm_params));
 971
 972                 maj_stat = gss_export_name(&min_stat, src_name, &buf);
 973                 INSIST(maj_stat == GSS_S_COMPLETE);
 974
 975                 CHECK(parse_name(buf.value, buf.length,
 976                                  GSS_KRB5_MECHANISM, &client));
 977
 978                 gss_release_buffer(&min_stat, &buf);
 979
 980                 krb5_warnx(context, "%s connected", client);
 981
 982                 ret = kadm5_s_init_with_password_ctx(context,
 983                                                      client,
 984                                                      NULL,
 985                                                      KADM5_ADMIN_SERVICE,
 986                                                      &realm_params,
 987                                                      0, 0,
 988                                                      &server_handle);
 989                 INSIST(ret == 0);
 990             }
 991
 992             INSIST(gctx.ctx != GSS_C_NO_CONTEXT);
 993
 994             CHECK(krb5_store_uint32(dreply, 0));
 995             CHECK(store_gss_init_res(dreply, gctx.handle,
 996                                      maj_stat, min_stat, 1, &gout));
 997             if (gout.value)
 998                 gss_release_buffer(&min_stat, &gout);
 999             if (src_name)
1000                 gss_release_name(&min_stat, &src_name);
1001
1002             break;
1003         }
1004         case RPG_DESTROY:
1005             krb5_errx(context, 1, "client destroyed gss context");
1006         default:
1007             krb5_errx(context, 1, "client sent unknown gsscode %d",
1008                       (int)gcred.proc);
1009         }
1010
1011         krb5_data_free(&gcred.handle);
1012         krb5_data_free(&chdr.cred.data);
1013         krb5_data_free(&chdr.verf.data);
1014         krb5_data_free(&headercopy);
1015
1016         CHECK(krb5_store_uint32(reply, chdr.xid));
1017         CHECK(krb5_store_uint32(reply, 1)); /* REPLY */
1018         CHECK(krb5_store_uint32(reply, 0)); /* MSG_ACCEPTED */
1019
1020         if (!gctx.done) {
1021             krb5_data data;
1022
1023             CHECK(krb5_store_uint32(reply, 0)); /* flavor_none */
1024             CHECK(krb5_store_uint32(reply, 0)); /* length */
1025
1026             CHECK(krb5_store_uint32(reply, 0)); /* SUCCESS */
1027
1028             CHECK(krb5_storage_to_data(dreply, &data));
1029             INSIST(krb5_storage_write(reply, data.data, data.length) == data.length);
1030             krb5_data_free(&data);
1031
1032         } else {
1033             uint32_t seqnum = htonl(gctx.seq_num);
1034             krb5_data data;
1035
1036             gin.value = &seqnum;
1037             gin.length = sizeof(seqnum);
1038
1039             maj_stat = gss_get_mic(&min_stat, gctx.ctx, 0, &gin, &gout);
1040             INSIST(maj_stat == GSS_S_COMPLETE);
1041
1042             data.data = gout.value;
1043             data.length = gout.length;
1044
1045             CHECK(krb5_store_uint32(reply, FLAVOR_GSS));
1046             CHECK(store_data_xdr(reply, data));
1047             gss_release_buffer(&min_stat, &gout);
1048
1049             CHECK(krb5_store_uint32(reply, 0)); /* SUCCESS */
1050
1051             CHECK(krb5_storage_to_data(dreply, &data));
1052
1053             if (gctx.inprogress) {
1054                 ssize_t sret;
1055                 gctx.inprogress = 0;
1056                 sret = krb5_storage_write(reply, data.data, data.length);
1057                 INSIST(sret == data.length);
1058                 krb5_data_free(&data);
1059             } else {
1060                 int conf_state;
1061
1062                 gin.value = data.data;
1063                 gin.length = data.length;
1064
1065                 maj_stat = gss_wrap(&min_stat, gctx.ctx, 1, 0,
1066                                     &gin, &conf_state, &gout);
1067                 INSIST(maj_stat == GSS_S_COMPLETE);
1068                 INSIST(conf_state != 0);
1069                 krb5_data_free(&data);
1070
1071                 data.data = gout.value;
1072                 data.length = gout.length;
1073
1074                 store_data_xdr(reply, data);
1075                 gss_release_buffer(&min_stat, &gout);
1076             }
1077         }
1078
1079         {
1080             krb5_data data;
1081             ssize_t sret;
1082             CHECK(krb5_storage_to_data(reply, &data));
1083             CHECK(krb5_store_uint32(sp, data.length | LAST_FRAGMENT));
1084             sret = krb5_storage_write(sp, data.data, data.length);
1085             INSIST(sret == data.length);
1086             krb5_data_free(&data);
1087         }
1088
1089     }
1090 }
1091
1092
1093 int
1094 handle_mit(krb5_context context, void *buf, size_t len, int fd)
1095 {
1096     krb5_storage *sp;
1097
1098     dcontext = context;
1099
1100     sp = krb5_storage_from_fd(fd);
1101     INSIST(sp != NULL);
1102
1103     process_stream(context, buf, len, sp);
1104
1105     return 0;
1106 }