kssl.c revision 296465
1/* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */ 2/* 3 * Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 4 * 2000. 5 */ 6/* ==================================================================== 7 * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60/*- 61 * ssl/kssl.c -- Routines to support (& debug) Kerberos5 auth for openssl 62 * 63 * 19990701 VRS Started. 64 * 200011?? Jeffrey Altman, Richard Levitte 65 * Generalized for Heimdal, Newer MIT, & Win32. 66 * Integrated into main OpenSSL 0.9.7 snapshots. 67 * 20010413 Simon Wilkinson, VRS 68 * Real RFC2712 KerberosWrapper replaces AP_REQ. 69 */ 70 71#include <openssl/opensslconf.h> 72 73#include <string.h> 74 75#define KRB5_PRIVATE 1 76 77#include <openssl/ssl.h> 78#include <openssl/evp.h> 79#include <openssl/objects.h> 80#include <openssl/krb5_asn.h> 81 82#ifndef OPENSSL_NO_KRB5 83 84# ifndef ENOMEM 85# define ENOMEM KRB5KRB_ERR_GENERIC 86# endif 87 88/* 89 * When OpenSSL is built on Windows, we do not want to require that 90 * the Kerberos DLLs be available in order for the OpenSSL DLLs to 91 * work. Therefore, all Kerberos routines are loaded at run time 92 * and we do not link to a .LIB file. 93 */ 94 95# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) 96/* 97 * The purpose of the following pre-processor statements is to provide 98 * compatibility with different releases of MIT Kerberos for Windows. 99 * All versions up to 1.2 used macros. But macros do not allow for 100 * a binary compatible interface for DLLs. Therefore, all macros are 101 * being replaced by function calls. The following code will allow 102 * an OpenSSL DLL built on Windows to work whether or not the macro 103 * or function form of the routines are utilized. 104 */ 105# ifdef krb5_cc_get_principal 106# define NO_DEF_KRB5_CCACHE 107# undef krb5_cc_get_principal 108# endif 109# define krb5_cc_get_principal kssl_krb5_cc_get_principal 110 111# define krb5_free_data_contents kssl_krb5_free_data_contents 112# define krb5_free_context kssl_krb5_free_context 113# define krb5_auth_con_free kssl_krb5_auth_con_free 114# define krb5_free_principal kssl_krb5_free_principal 115# define krb5_mk_req_extended kssl_krb5_mk_req_extended 116# define krb5_get_credentials kssl_krb5_get_credentials 117# define krb5_cc_default kssl_krb5_cc_default 118# define krb5_sname_to_principal kssl_krb5_sname_to_principal 119# define krb5_init_context kssl_krb5_init_context 120# define krb5_free_ticket kssl_krb5_free_ticket 121# define krb5_rd_req kssl_krb5_rd_req 122# define krb5_kt_default kssl_krb5_kt_default 123# define krb5_kt_resolve kssl_krb5_kt_resolve 124/* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */ 125# ifndef krb5_kt_close 126# define krb5_kt_close kssl_krb5_kt_close 127# endif /* krb5_kt_close */ 128# ifndef krb5_kt_get_entry 129# define krb5_kt_get_entry kssl_krb5_kt_get_entry 130# endif /* krb5_kt_get_entry */ 131# define krb5_auth_con_init kssl_krb5_auth_con_init 132 133# define krb5_principal_compare kssl_krb5_principal_compare 134# define krb5_decrypt_tkt_part kssl_krb5_decrypt_tkt_part 135# define krb5_timeofday kssl_krb5_timeofday 136# define krb5_rc_default kssl_krb5_rc_default 137 138# ifdef krb5_rc_initialize 139# undef krb5_rc_initialize 140# endif 141# define krb5_rc_initialize kssl_krb5_rc_initialize 142 143# ifdef krb5_rc_get_lifespan 144# undef krb5_rc_get_lifespan 145# endif 146# define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan 147 148# ifdef krb5_rc_destroy 149# undef krb5_rc_destroy 150# endif 151# define krb5_rc_destroy kssl_krb5_rc_destroy 152 153# define valid_cksumtype kssl_valid_cksumtype 154# define krb5_checksum_size kssl_krb5_checksum_size 155# define krb5_kt_free_entry kssl_krb5_kt_free_entry 156# define krb5_auth_con_setrcache kssl_krb5_auth_con_setrcache 157# define krb5_auth_con_getrcache kssl_krb5_auth_con_getrcache 158# define krb5_get_server_rcache kssl_krb5_get_server_rcache 159 160/* Prototypes for built in stubs */ 161void kssl_krb5_free_data_contents(krb5_context, krb5_data *); 162void kssl_krb5_free_principal(krb5_context, krb5_principal); 163krb5_error_code kssl_krb5_kt_resolve(krb5_context, 164 krb5_const char *, krb5_keytab *); 165krb5_error_code kssl_krb5_kt_default(krb5_context, krb5_keytab *); 166krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *); 167krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, 168 krb5_const krb5_data *, 169 krb5_const_principal, krb5_keytab, 170 krb5_flags *, krb5_ticket **); 171 172krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal, 173 krb5_const_principal); 174krb5_error_code kssl_krb5_mk_req_extended(krb5_context, 175 krb5_auth_context *, 176 krb5_const krb5_flags, 177 krb5_data *, 178 krb5_creds *, krb5_data *); 179krb5_error_code kssl_krb5_init_context(krb5_context *); 180void kssl_krb5_free_context(krb5_context); 181krb5_error_code kssl_krb5_cc_default(krb5_context, krb5_ccache *); 182krb5_error_code kssl_krb5_sname_to_principal(krb5_context, 183 krb5_const char *, 184 krb5_const char *, 185 krb5_int32, krb5_principal *); 186krb5_error_code kssl_krb5_get_credentials(krb5_context, 187 krb5_const krb5_flags, 188 krb5_ccache, 189 krb5_creds *, krb5_creds * *); 190krb5_error_code kssl_krb5_auth_con_init(krb5_context, krb5_auth_context *); 191krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, 192 krb5_ccache cache, 193 krb5_principal *principal); 194krb5_error_code kssl_krb5_auth_con_free(krb5_context, krb5_auth_context); 195size_t kssl_krb5_checksum_size(krb5_context context, krb5_cksumtype ctype); 196krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype); 197krb5_error_code krb5_kt_free_entry(krb5_context, krb5_keytab_entry FAR *); 198krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context, 199 krb5_auth_context, krb5_rcache); 200krb5_error_code kssl_krb5_get_server_rcache(krb5_context, 201 krb5_const krb5_data *, 202 krb5_rcache *); 203krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context, 204 krb5_auth_context, 205 krb5_rcache *); 206 207/* Function pointers (almost all Kerberos functions are _stdcall) */ 208static void (_stdcall *p_krb5_free_data_contents) (krb5_context, krb5_data *) 209 = NULL; 210static void (_stdcall *p_krb5_free_principal) (krb5_context, krb5_principal) 211 = NULL; 212static krb5_error_code(_stdcall *p_krb5_kt_resolve) 213 (krb5_context, krb5_const char *, krb5_keytab *) = NULL; 214static krb5_error_code(_stdcall *p_krb5_kt_default) (krb5_context, 215 krb5_keytab *) = NULL; 216static krb5_error_code(_stdcall *p_krb5_free_ticket) (krb5_context, 217 krb5_ticket *) = NULL; 218static krb5_error_code(_stdcall *p_krb5_rd_req) (krb5_context, 219 krb5_auth_context *, 220 krb5_const krb5_data *, 221 krb5_const_principal, 222 krb5_keytab, krb5_flags *, 223 krb5_ticket **) = NULL; 224static krb5_error_code(_stdcall *p_krb5_mk_req_extended) 225 (krb5_context, krb5_auth_context *, 226 krb5_const krb5_flags, krb5_data *, krb5_creds *, krb5_data *) = NULL; 227static krb5_error_code(_stdcall *p_krb5_init_context) (krb5_context *) = NULL; 228static void (_stdcall *p_krb5_free_context) (krb5_context) = NULL; 229static krb5_error_code(_stdcall *p_krb5_cc_default) (krb5_context, 230 krb5_ccache *) = NULL; 231static krb5_error_code(_stdcall *p_krb5_sname_to_principal) 232 (krb5_context, krb5_const char *, krb5_const char *, 233 krb5_int32, krb5_principal *) = NULL; 234static krb5_error_code(_stdcall *p_krb5_get_credentials) 235 (krb5_context, krb5_const krb5_flags, krb5_ccache, 236 krb5_creds *, krb5_creds **) = NULL; 237static krb5_error_code(_stdcall *p_krb5_auth_con_init) 238 (krb5_context, krb5_auth_context *) = NULL; 239static krb5_error_code(_stdcall *p_krb5_cc_get_principal) 240 (krb5_context context, krb5_ccache cache, krb5_principal *principal) = NULL; 241static krb5_error_code(_stdcall *p_krb5_auth_con_free) 242 (krb5_context, krb5_auth_context) = NULL; 243static krb5_error_code(_stdcall *p_krb5_decrypt_tkt_part) 244 (krb5_context, krb5_const krb5_keyblock *, krb5_ticket *) = NULL; 245static krb5_error_code(_stdcall *p_krb5_timeofday) 246 (krb5_context context, krb5_int32 *timeret) = NULL; 247static krb5_error_code(_stdcall *p_krb5_rc_default) 248 (krb5_context context, krb5_rcache *rc) = NULL; 249static krb5_error_code(_stdcall *p_krb5_rc_initialize) 250 (krb5_context context, krb5_rcache rc, krb5_deltat lifespan) = NULL; 251static krb5_error_code(_stdcall *p_krb5_rc_get_lifespan) 252 (krb5_context context, krb5_rcache rc, krb5_deltat *lifespan) = NULL; 253static krb5_error_code(_stdcall *p_krb5_rc_destroy) 254 (krb5_context context, krb5_rcache rc) = NULL; 255static krb5_boolean(_stdcall *p_krb5_principal_compare) 256 (krb5_context, krb5_const_principal, krb5_const_principal) = NULL; 257static size_t (_stdcall *p_krb5_checksum_size) (krb5_context context, 258 krb5_cksumtype ctype) = NULL; 259static krb5_boolean(_stdcall *p_valid_cksumtype) (krb5_cksumtype ctype) = 260 NULL; 261static krb5_error_code(_stdcall *p_krb5_kt_free_entry) 262 (krb5_context, krb5_keytab_entry *) = NULL; 263static krb5_error_code(_stdcall *p_krb5_auth_con_setrcache) (krb5_context, 264 krb5_auth_context, 265 krb5_rcache) = 266 NULL; 267static krb5_error_code(_stdcall *p_krb5_get_server_rcache) (krb5_context, 268 krb5_const 269 krb5_data *, 270 krb5_rcache *) = 271 NULL; 272static krb5_error_code(*p_krb5_auth_con_getrcache) (krb5_context, 273 krb5_auth_context, 274 krb5_rcache *) = NULL; 275static krb5_error_code(_stdcall *p_krb5_kt_close) (krb5_context context, 276 krb5_keytab keytab) = NULL; 277static krb5_error_code(_stdcall *p_krb5_kt_get_entry) (krb5_context context, 278 krb5_keytab keytab, 279 krb5_const_principal 280 principal, 281 krb5_kvno vno, 282 krb5_enctype enctype, 283 krb5_keytab_entry 284 *entry) = NULL; 285static int krb5_loaded = 0; /* only attempt to initialize func ptrs once */ 286 287/* Function to Load the Kerberos 5 DLL and initialize function pointers */ 288void load_krb5_dll(void) 289{ 290 HANDLE hKRB5_32; 291 292 krb5_loaded++; 293 hKRB5_32 = LoadLibrary(TEXT("KRB5_32")); 294 if (!hKRB5_32) 295 return; 296 297 (FARPROC) p_krb5_free_data_contents = 298 GetProcAddress(hKRB5_32, "krb5_free_data_contents"); 299 (FARPROC) p_krb5_free_context = 300 GetProcAddress(hKRB5_32, "krb5_free_context"); 301 (FARPROC) p_krb5_auth_con_free = 302 GetProcAddress(hKRB5_32, "krb5_auth_con_free"); 303 (FARPROC) p_krb5_free_principal = 304 GetProcAddress(hKRB5_32, "krb5_free_principal"); 305 (FARPROC) p_krb5_mk_req_extended = 306 GetProcAddress(hKRB5_32, "krb5_mk_req_extended"); 307 (FARPROC) p_krb5_get_credentials = 308 GetProcAddress(hKRB5_32, "krb5_get_credentials"); 309 (FARPROC) p_krb5_cc_get_principal = 310 GetProcAddress(hKRB5_32, "krb5_cc_get_principal"); 311 (FARPROC) p_krb5_cc_default = GetProcAddress(hKRB5_32, "krb5_cc_default"); 312 (FARPROC) p_krb5_sname_to_principal = 313 GetProcAddress(hKRB5_32, "krb5_sname_to_principal"); 314 (FARPROC) p_krb5_init_context = 315 GetProcAddress(hKRB5_32, "krb5_init_context"); 316 (FARPROC) p_krb5_free_ticket = 317 GetProcAddress(hKRB5_32, "krb5_free_ticket"); 318 (FARPROC) p_krb5_rd_req = GetProcAddress(hKRB5_32, "krb5_rd_req"); 319 (FARPROC) p_krb5_principal_compare = 320 GetProcAddress(hKRB5_32, "krb5_principal_compare"); 321 (FARPROC) p_krb5_decrypt_tkt_part = 322 GetProcAddress(hKRB5_32, "krb5_decrypt_tkt_part"); 323 (FARPROC) p_krb5_timeofday = GetProcAddress(hKRB5_32, "krb5_timeofday"); 324 (FARPROC) p_krb5_rc_default = GetProcAddress(hKRB5_32, "krb5_rc_default"); 325 (FARPROC) p_krb5_rc_initialize = 326 GetProcAddress(hKRB5_32, "krb5_rc_initialize"); 327 (FARPROC) p_krb5_rc_get_lifespan = 328 GetProcAddress(hKRB5_32, "krb5_rc_get_lifespan"); 329 (FARPROC) p_krb5_rc_destroy = GetProcAddress(hKRB5_32, "krb5_rc_destroy"); 330 (FARPROC) p_krb5_kt_default = GetProcAddress(hKRB5_32, "krb5_kt_default"); 331 (FARPROC) p_krb5_kt_resolve = GetProcAddress(hKRB5_32, "krb5_kt_resolve"); 332 (FARPROC) p_krb5_auth_con_init = 333 GetProcAddress(hKRB5_32, "krb5_auth_con_init"); 334 (FARPROC) p_valid_cksumtype = GetProcAddress(hKRB5_32, "valid_cksumtype"); 335 (FARPROC) p_krb5_checksum_size = 336 GetProcAddress(hKRB5_32, "krb5_checksum_size"); 337 (FARPROC) p_krb5_kt_free_entry = 338 GetProcAddress(hKRB5_32, "krb5_kt_free_entry"); 339 (FARPROC) p_krb5_auth_con_setrcache = 340 GetProcAddress(hKRB5_32, "krb5_auth_con_setrcache"); 341 (FARPROC) p_krb5_get_server_rcache = 342 GetProcAddress(hKRB5_32, "krb5_get_server_rcache"); 343 (FARPROC) p_krb5_auth_con_getrcache = 344 GetProcAddress(hKRB5_32, "krb5_auth_con_getrcache"); 345 (FARPROC) p_krb5_kt_close = GetProcAddress(hKRB5_32, "krb5_kt_close"); 346 (FARPROC) p_krb5_kt_get_entry = 347 GetProcAddress(hKRB5_32, "krb5_kt_get_entry"); 348} 349 350/* Stubs for each function to be dynamicly loaded */ 351void kssl_krb5_free_data_contents(krb5_context CO, krb5_data *data) 352{ 353 if (!krb5_loaded) 354 load_krb5_dll(); 355 356 if (p_krb5_free_data_contents) 357 p_krb5_free_data_contents(CO, data); 358} 359 360krb5_error_code 361kssl_krb5_mk_req_extended(krb5_context CO, 362 krb5_auth_context *pACO, 363 krb5_const krb5_flags F, 364 krb5_data *pD1, krb5_creds *pC, krb5_data *pD2) 365{ 366 if (!krb5_loaded) 367 load_krb5_dll(); 368 369 if (p_krb5_mk_req_extended) 370 return (p_krb5_mk_req_extended(CO, pACO, F, pD1, pC, pD2)); 371 else 372 return KRB5KRB_ERR_GENERIC; 373} 374 375krb5_error_code 376kssl_krb5_auth_con_init(krb5_context CO, krb5_auth_context *pACO) 377{ 378 if (!krb5_loaded) 379 load_krb5_dll(); 380 381 if (p_krb5_auth_con_init) 382 return (p_krb5_auth_con_init(CO, pACO)); 383 else 384 return KRB5KRB_ERR_GENERIC; 385} 386 387krb5_error_code 388kssl_krb5_auth_con_free(krb5_context CO, krb5_auth_context ACO) 389{ 390 if (!krb5_loaded) 391 load_krb5_dll(); 392 393 if (p_krb5_auth_con_free) 394 return (p_krb5_auth_con_free(CO, ACO)); 395 else 396 return KRB5KRB_ERR_GENERIC; 397} 398 399krb5_error_code 400kssl_krb5_get_credentials(krb5_context CO, 401 krb5_const krb5_flags F, 402 krb5_ccache CC, krb5_creds *pCR, krb5_creds **ppCR) 403{ 404 if (!krb5_loaded) 405 load_krb5_dll(); 406 407 if (p_krb5_get_credentials) 408 return (p_krb5_get_credentials(CO, F, CC, pCR, ppCR)); 409 else 410 return KRB5KRB_ERR_GENERIC; 411} 412 413krb5_error_code 414kssl_krb5_sname_to_principal(krb5_context CO, 415 krb5_const char *pC1, 416 krb5_const char *pC2, 417 krb5_int32 I, krb5_principal *pPR) 418{ 419 if (!krb5_loaded) 420 load_krb5_dll(); 421 422 if (p_krb5_sname_to_principal) 423 return (p_krb5_sname_to_principal(CO, pC1, pC2, I, pPR)); 424 else 425 return KRB5KRB_ERR_GENERIC; 426} 427 428krb5_error_code kssl_krb5_cc_default(krb5_context CO, krb5_ccache *pCC) 429{ 430 if (!krb5_loaded) 431 load_krb5_dll(); 432 433 if (p_krb5_cc_default) 434 return (p_krb5_cc_default(CO, pCC)); 435 else 436 return KRB5KRB_ERR_GENERIC; 437} 438 439krb5_error_code kssl_krb5_init_context(krb5_context *pCO) 440{ 441 if (!krb5_loaded) 442 load_krb5_dll(); 443 444 if (p_krb5_init_context) 445 return (p_krb5_init_context(pCO)); 446 else 447 return KRB5KRB_ERR_GENERIC; 448} 449 450void kssl_krb5_free_context(krb5_context CO) 451{ 452 if (!krb5_loaded) 453 load_krb5_dll(); 454 455 if (p_krb5_free_context) 456 p_krb5_free_context(CO); 457} 458 459void kssl_krb5_free_principal(krb5_context c, krb5_principal p) 460{ 461 if (!krb5_loaded) 462 load_krb5_dll(); 463 464 if (p_krb5_free_principal) 465 p_krb5_free_principal(c, p); 466} 467 468krb5_error_code 469kssl_krb5_kt_resolve(krb5_context con, krb5_const char *sz, krb5_keytab *kt) 470{ 471 if (!krb5_loaded) 472 load_krb5_dll(); 473 474 if (p_krb5_kt_resolve) 475 return (p_krb5_kt_resolve(con, sz, kt)); 476 else 477 return KRB5KRB_ERR_GENERIC; 478} 479 480krb5_error_code kssl_krb5_kt_default(krb5_context con, krb5_keytab *kt) 481{ 482 if (!krb5_loaded) 483 load_krb5_dll(); 484 485 if (p_krb5_kt_default) 486 return (p_krb5_kt_default(con, kt)); 487 else 488 return KRB5KRB_ERR_GENERIC; 489} 490 491krb5_error_code kssl_krb5_free_ticket(krb5_context con, krb5_ticket *kt) 492{ 493 if (!krb5_loaded) 494 load_krb5_dll(); 495 496 if (p_krb5_free_ticket) 497 return (p_krb5_free_ticket(con, kt)); 498 else 499 return KRB5KRB_ERR_GENERIC; 500} 501 502krb5_error_code 503kssl_krb5_rd_req(krb5_context con, krb5_auth_context *pacon, 504 krb5_const krb5_data *data, 505 krb5_const_principal princ, krb5_keytab keytab, 506 krb5_flags *flags, krb5_ticket **pptkt) 507{ 508 if (!krb5_loaded) 509 load_krb5_dll(); 510 511 if (p_krb5_rd_req) 512 return (p_krb5_rd_req(con, pacon, data, princ, keytab, flags, pptkt)); 513 else 514 return KRB5KRB_ERR_GENERIC; 515} 516 517krb5_boolean 518krb5_principal_compare(krb5_context con, krb5_const_principal princ1, 519 krb5_const_principal princ2) 520{ 521 if (!krb5_loaded) 522 load_krb5_dll(); 523 524 if (p_krb5_principal_compare) 525 return (p_krb5_principal_compare(con, princ1, princ2)); 526 else 527 return KRB5KRB_ERR_GENERIC; 528} 529 530krb5_error_code 531krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys, 532 krb5_ticket *ticket) 533{ 534 if (!krb5_loaded) 535 load_krb5_dll(); 536 537 if (p_krb5_decrypt_tkt_part) 538 return (p_krb5_decrypt_tkt_part(con, keys, ticket)); 539 else 540 return KRB5KRB_ERR_GENERIC; 541} 542 543krb5_error_code krb5_timeofday(krb5_context con, krb5_int32 *timeret) 544{ 545 if (!krb5_loaded) 546 load_krb5_dll(); 547 548 if (p_krb5_timeofday) 549 return (p_krb5_timeofday(con, timeret)); 550 else 551 return KRB5KRB_ERR_GENERIC; 552} 553 554krb5_error_code krb5_rc_default(krb5_context con, krb5_rcache *rc) 555{ 556 if (!krb5_loaded) 557 load_krb5_dll(); 558 559 if (p_krb5_rc_default) 560 return (p_krb5_rc_default(con, rc)); 561 else 562 return KRB5KRB_ERR_GENERIC; 563} 564 565krb5_error_code 566krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan) 567{ 568 if (!krb5_loaded) 569 load_krb5_dll(); 570 571 if (p_krb5_rc_initialize) 572 return (p_krb5_rc_initialize(con, rc, lifespan)); 573 else 574 return KRB5KRB_ERR_GENERIC; 575} 576 577krb5_error_code 578krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp) 579{ 580 if (!krb5_loaded) 581 load_krb5_dll(); 582 583 if (p_krb5_rc_get_lifespan) 584 return (p_krb5_rc_get_lifespan(con, rc, lifespanp)); 585 else 586 return KRB5KRB_ERR_GENERIC; 587} 588 589krb5_error_code krb5_rc_destroy(krb5_context con, krb5_rcache rc) 590{ 591 if (!krb5_loaded) 592 load_krb5_dll(); 593 594 if (p_krb5_rc_destroy) 595 return (p_krb5_rc_destroy(con, rc)); 596 else 597 return KRB5KRB_ERR_GENERIC; 598} 599 600size_t krb5_checksum_size(krb5_context context, krb5_cksumtype ctype) 601{ 602 if (!krb5_loaded) 603 load_krb5_dll(); 604 605 if (p_krb5_checksum_size) 606 return (p_krb5_checksum_size(context, ctype)); 607 else 608 return KRB5KRB_ERR_GENERIC; 609} 610 611krb5_boolean valid_cksumtype(krb5_cksumtype ctype) 612{ 613 if (!krb5_loaded) 614 load_krb5_dll(); 615 616 if (p_valid_cksumtype) 617 return (p_valid_cksumtype(ctype)); 618 else 619 return KRB5KRB_ERR_GENERIC; 620} 621 622krb5_error_code krb5_kt_free_entry(krb5_context con, krb5_keytab_entry *entry) 623{ 624 if (!krb5_loaded) 625 load_krb5_dll(); 626 627 if (p_krb5_kt_free_entry) 628 return (p_krb5_kt_free_entry(con, entry)); 629 else 630 return KRB5KRB_ERR_GENERIC; 631} 632 633/* Structure definitions */ 634# ifndef NO_DEF_KRB5_CCACHE 635# ifndef krb5_x 636# define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1)) 637# define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0)) 638# endif 639 640typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */ 641 642typedef struct _krb5_ccache { 643 krb5_magic magic; 644 struct _krb5_cc_ops FAR *ops; 645 krb5_pointer data; 646} *krb5_ccache; 647 648typedef struct _krb5_cc_ops { 649 krb5_magic magic; 650 char *prefix; 651 char *(KRB5_CALLCONV *get_name) 652 (krb5_context, krb5_ccache); 653 krb5_error_code(KRB5_CALLCONV *resolve) 654 (krb5_context, krb5_ccache *, const char *); 655 krb5_error_code(KRB5_CALLCONV *gen_new) 656 (krb5_context, krb5_ccache *); 657 krb5_error_code(KRB5_CALLCONV *init) 658 (krb5_context, krb5_ccache, krb5_principal); 659 krb5_error_code(KRB5_CALLCONV *destroy) 660 (krb5_context, krb5_ccache); 661 krb5_error_code(KRB5_CALLCONV *close) 662 (krb5_context, krb5_ccache); 663 krb5_error_code(KRB5_CALLCONV *store) 664 (krb5_context, krb5_ccache, krb5_creds *); 665 krb5_error_code(KRB5_CALLCONV *retrieve) 666 (krb5_context, krb5_ccache, krb5_flags, krb5_creds *, krb5_creds *); 667 krb5_error_code(KRB5_CALLCONV *get_princ) 668 (krb5_context, krb5_ccache, krb5_principal *); 669 krb5_error_code(KRB5_CALLCONV *get_first) 670 (krb5_context, krb5_ccache, krb5_cc_cursor *); 671 krb5_error_code(KRB5_CALLCONV *get_next) 672 (krb5_context, krb5_ccache, krb5_cc_cursor *, krb5_creds *); 673 krb5_error_code(KRB5_CALLCONV *end_get) 674 (krb5_context, krb5_ccache, krb5_cc_cursor *); 675 krb5_error_code(KRB5_CALLCONV *remove_cred) 676 (krb5_context, krb5_ccache, krb5_flags, krb5_creds *); 677 krb5_error_code(KRB5_CALLCONV *set_flags) 678 (krb5_context, krb5_ccache, krb5_flags); 679} krb5_cc_ops; 680# endif /* NO_DEF_KRB5_CCACHE */ 681 682krb5_error_code 683 kssl_krb5_cc_get_principal 684 (krb5_context context, krb5_ccache cache, krb5_principal *principal) { 685 if (p_krb5_cc_get_principal) 686 return (p_krb5_cc_get_principal(context, cache, principal)); 687 else 688 return (krb5_x((cache)->ops->get_princ, (context, cache, principal))); 689} 690 691krb5_error_code 692kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon, 693 krb5_rcache rcache) 694{ 695 if (p_krb5_auth_con_setrcache) 696 return (p_krb5_auth_con_setrcache(con, acon, rcache)); 697 else 698 return KRB5KRB_ERR_GENERIC; 699} 700 701krb5_error_code 702kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data *data, 703 krb5_rcache *rcache) 704{ 705 if (p_krb5_get_server_rcache) 706 return (p_krb5_get_server_rcache(con, data, rcache)); 707 else 708 return KRB5KRB_ERR_GENERIC; 709} 710 711krb5_error_code 712kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon, 713 krb5_rcache *prcache) 714{ 715 if (p_krb5_auth_con_getrcache) 716 return (p_krb5_auth_con_getrcache(con, acon, prcache)); 717 else 718 return KRB5KRB_ERR_GENERIC; 719} 720 721krb5_error_code kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab) 722{ 723 if (p_krb5_kt_close) 724 return (p_krb5_kt_close(context, keytab)); 725 else 726 return KRB5KRB_ERR_GENERIC; 727} 728 729krb5_error_code 730kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab, 731 krb5_const_principal principal, krb5_kvno vno, 732 krb5_enctype enctype, krb5_keytab_entry *entry) 733{ 734 if (p_krb5_kt_get_entry) 735 return (p_krb5_kt_get_entry 736 (context, keytab, principal, vno, enctype, entry)); 737 else 738 return KRB5KRB_ERR_GENERIC; 739} 740# endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */ 741 742/* 743 * memory allocation functions for non-temporary storage (e.g. stuff that 744 * gets saved into the kssl context) 745 */ 746static void *kssl_calloc(size_t nmemb, size_t size) 747{ 748 void *p; 749 750 p = OPENSSL_malloc(nmemb * size); 751 if (p) { 752 memset(p, 0, nmemb * size); 753 } 754 return p; 755} 756 757# define kssl_malloc(size) OPENSSL_malloc((size)) 758# define kssl_realloc(ptr, size) OPENSSL_realloc(ptr, size) 759# define kssl_free(ptr) OPENSSL_free((ptr)) 760 761char 762*kstring(char *string) 763{ 764 static char *null = "[NULL]"; 765 766 return ((string == NULL) ? null : string); 767} 768 769/* 770 * Given KRB5 enctype (basically DES or 3DES), return closest match openssl 771 * EVP_ encryption algorithm. Return NULL for unknown or problematic 772 * (krb5_dk_encrypt) enctypes. Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are 773 * OK. 774 */ 775const EVP_CIPHER *kssl_map_enc(krb5_enctype enctype) 776{ 777 switch (enctype) { 778 case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */ 779 case ENCTYPE_DES_CBC_CRC: 780 case ENCTYPE_DES_CBC_MD4: 781 case ENCTYPE_DES_CBC_MD5: 782 case ENCTYPE_DES_CBC_RAW: 783 return EVP_des_cbc(); 784 break; 785 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 786 case ENCTYPE_DES3_CBC_SHA: 787 case ENCTYPE_DES3_CBC_RAW: 788 return EVP_des_ede3_cbc(); 789 break; 790 default: 791 return NULL; 792 break; 793 } 794} 795 796/* 797 * Return true:1 if p "looks like" the start of the real authenticator 798 * described in kssl_skip_confound() below. The ASN.1 pattern is "62 xx 30 799 * yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and xx and yy are 800 * possibly multi-byte length fields. 801 */ 802int kssl_test_confound(unsigned char *p) 803{ 804 int len = 2; 805 int xx = 0, yy = 0; 806 807 if (*p++ != 0x62) 808 return 0; 809 if (*p > 0x82) 810 return 0; 811 switch (*p) { 812 case 0x82: 813 p++; 814 xx = (*p++ << 8); 815 xx += *p++; 816 break; 817 case 0x81: 818 p++; 819 xx = *p++; 820 break; 821 case 0x80: 822 return 0; 823 default: 824 xx = *p++; 825 break; 826 } 827 if (*p++ != 0x30) 828 return 0; 829 if (*p > 0x82) 830 return 0; 831 switch (*p) { 832 case 0x82: 833 p++; 834 len += 2; 835 yy = (*p++ << 8); 836 yy += *p++; 837 break; 838 case 0x81: 839 p++; 840 len++; 841 yy = *p++; 842 break; 843 case 0x80: 844 return 0; 845 default: 846 yy = *p++; 847 break; 848 } 849 850 return (xx - len == yy) ? 1 : 0; 851} 852 853/* 854 * Allocate, fill, and return cksumlens array of checksum lengths. This 855 * array holds just the unique elements from the krb5_cksumarray[]. array[n] 856 * == 0 signals end of data. The krb5_cksumarray[] was an internal variable 857 * that has since been replaced by a more general method for storing the 858 * data. It should not be used. Instead we use real API calls and make a 859 * guess for what the highest assigned CKSUMTYPE_ constant is. As of 1.2.2 860 * it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3). So we will use 0x0010. 861 */ 862size_t *populate_cksumlens(void) 863{ 864 int i, j, n; 865 static size_t *cklens = NULL; 866 867# ifdef KRB5_MIT_OLD11 868 n = krb5_max_cksum; 869# else 870 n = 0x0010; 871# endif /* KRB5_MIT_OLD11 */ 872 873# ifdef KRB5CHECKAUTH 874 if (!cklens && !(cklens = (size_t *)calloc(sizeof(int), n + 1))) 875 return NULL; 876 877 for (i = 0; i < n; i++) { 878 if (!valid_cksumtype(i)) 879 continue; /* array has holes */ 880 for (j = 0; j < n; j++) { 881 if (cklens[j] == 0) { 882 cklens[j] = krb5_checksum_size(NULL, i); 883 break; /* krb5 elem was new: add */ 884 } 885 if (cklens[j] == krb5_checksum_size(NULL, i)) { 886 break; /* ignore duplicate elements */ 887 } 888 } 889 } 890# endif /* KRB5CHECKAUTH */ 891 892 return cklens; 893} 894 895/*- 896 * Return pointer to start of real authenticator within authenticator, or 897 * return NULL on error. 898 * Decrypted authenticator looks like this: 899 * [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r] 900 * This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the 901 * krb5_auth_con_getcksumtype() function advertised in its krb5.h. 902 */ 903unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a) 904{ 905 int i, conlen; 906 size_t cklen; 907 static size_t *cksumlens = NULL; 908 unsigned char *test_auth; 909 910 conlen = (etype) ? 8 : 0; 911 912 if (!cksumlens && !(cksumlens = populate_cksumlens())) 913 return NULL; 914 for (i = 0; (cklen = cksumlens[i]) != 0; i++) { 915 test_auth = a + conlen + cklen; 916 if (kssl_test_confound(test_auth)) 917 return test_auth; 918 } 919 920 return NULL; 921} 922 923/* 924 * Set kssl_err error info when reason text is a simple string kssl_err = 925 * struct { int reason; char text[KSSL_ERR_MAX+1]; } 926 */ 927void kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text) 928{ 929 if (kssl_err == NULL) 930 return; 931 932 kssl_err->reason = reason; 933 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "%s", text); 934 return; 935} 936 937/* 938 * Display contents of krb5_data struct, for debugging 939 */ 940void print_krb5_data(char *label, krb5_data *kdata) 941{ 942 int i; 943 944 printf("%s[%d] ", label, kdata->length); 945 for (i = 0; i < (int)kdata->length; i++) { 946 if (0 && isprint((int)kdata->data[i])) 947 printf("%c ", kdata->data[i]); 948 else 949 printf("%02x ", (unsigned char)kdata->data[i]); 950 } 951 printf("\n"); 952} 953 954/* 955 * Display contents of krb5_authdata struct, for debugging 956 */ 957void print_krb5_authdata(char *label, krb5_authdata **adata) 958{ 959 if (adata == NULL) { 960 printf("%s, authdata==0\n", label); 961 return; 962 } 963 printf("%s [%p]\n", label, (void *)adata); 964# if 0 965 { 966 int i; 967 printf("%s[at%d:%d] ", label, adata->ad_type, adata->length); 968 for (i = 0; i < adata->length; i++) { 969 printf((isprint(adata->contents[i])) ? "%c " : "%02x", 970 adata->contents[i]); 971 } 972 printf("\n"); 973 } 974# endif 975} 976 977/* 978 * Display contents of krb5_keyblock struct, for debugging 979 */ 980void print_krb5_keyblock(char *label, krb5_keyblock *keyblk) 981{ 982 int i; 983 984 if (keyblk == NULL) { 985 printf("%s, keyblk==0\n", label); 986 return; 987 } 988# ifdef KRB5_HEIMDAL 989 printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype, 990 keyblk->keyvalue->length); 991 for (i = 0; i < (int)keyblk->keyvalue->length; i++) { 992 printf("%02x", (unsigned char *)(keyblk->keyvalue->contents)[i]); 993 } 994 printf("\n"); 995# else 996 printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length); 997 for (i = 0; i < (int)keyblk->length; i++) { 998 printf("%02x", keyblk->contents[i]); 999 } 1000 printf("\n"); 1001# endif 1002} 1003 1004/* 1005 * Display contents of krb5_principal_data struct, for debugging 1006 * (krb5_principal is typedef'd == krb5_principal_data *) 1007 */ 1008void print_krb5_princ(char *label, krb5_principal_data *princ) 1009{ 1010 int i, ui, uj; 1011 1012 printf("%s principal Realm: ", label); 1013 if (princ == NULL) 1014 return; 1015 for (ui = 0; ui < (int)princ->realm.length; ui++) 1016 putchar(princ->realm.data[ui]); 1017 printf(" (nametype %d) has %d strings:\n", princ->type, princ->length); 1018 for (i = 0; i < (int)princ->length; i++) { 1019 printf("\t%d [%d]: ", i, princ->data[i].length); 1020 for (uj = 0; uj < (int)princ->data[i].length; uj++) { 1021 putchar(princ->data[i].data[uj]); 1022 } 1023 printf("\n"); 1024 } 1025 return; 1026} 1027 1028/*- Given krb5 service (typically "kssl") and hostname in kssl_ctx, 1029 * Return encrypted Kerberos ticket for service @ hostname. 1030 * If authenp is non-NULL, also return encrypted authenticator, 1031 * whose data should be freed by caller. 1032 * (Originally was: Create Kerberos AP_REQ message for SSL Client.) 1033 * 1034 * 19990628 VRS Started; Returns Kerberos AP_REQ message. 1035 * 20010409 VRS Modified for RFC2712; Returns enc tkt. 1036 * 20010606 VRS May also return optional authenticator. 1037 */ 1038krb5_error_code kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1039 /* 1040 * OUT 1041 */ krb5_data **enc_ticketp, 1042 /* 1043 * UPDATE 1044 */ krb5_data *authenp, 1045 /* 1046 * OUT 1047 */ KSSL_ERR *kssl_err) 1048{ 1049 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1050 krb5_context krb5context = NULL; 1051 krb5_auth_context krb5auth_context = NULL; 1052 krb5_ccache krb5ccdef = NULL; 1053 krb5_creds krb5creds, *krb5credsp = NULL; 1054 krb5_data krb5_app_req; 1055 1056 kssl_err_set(kssl_err, 0, ""); 1057 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1058 1059 if (!kssl_ctx) { 1060 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n"); 1061 goto err; 1062 } else if (!kssl_ctx->service_host) { 1063 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1064 "kssl_ctx service_host undefined.\n"); 1065 goto err; 1066 } 1067 1068 if ((krb5rc = krb5_init_context(&krb5context)) != 0) { 1069 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1070 "krb5_init_context() fails: %d\n", krb5rc); 1071 kssl_err->reason = SSL_R_KRB5_C_INIT; 1072 goto err; 1073 } 1074 1075 if ((krb5rc = krb5_sname_to_principal(krb5context, 1076 kssl_ctx->service_host, 1077 (kssl_ctx->service_name) ? 1078 kssl_ctx->service_name : KRB5SVC, 1079 KRB5_NT_SRV_HST, 1080 &krb5creds.server)) != 0) { 1081 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1082 "krb5_sname_to_principal() fails for %s/%s\n", 1083 kssl_ctx->service_host, 1084 (kssl_ctx-> 1085 service_name) ? kssl_ctx->service_name : KRB5SVC); 1086 kssl_err->reason = SSL_R_KRB5_C_INIT; 1087 goto err; 1088 } 1089 1090 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) { 1091 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1092 "krb5_cc_default fails.\n"); 1093 goto err; 1094 } 1095 1096 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1097 &krb5creds.client)) != 0) { 1098 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1099 "krb5_cc_get_principal() fails.\n"); 1100 goto err; 1101 } 1102 1103 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1104 &krb5creds, &krb5credsp)) != 0) { 1105 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED, 1106 "krb5_get_credentials() fails.\n"); 1107 goto err; 1108 } 1109 1110 *enc_ticketp = &krb5credsp->ticket; 1111# ifdef KRB5_HEIMDAL 1112 kssl_ctx->enctype = krb5credsp->session.keytype; 1113# else 1114 kssl_ctx->enctype = krb5credsp->keyblock.enctype; 1115# endif 1116 1117 krb5rc = KRB5KRB_ERR_GENERIC; 1118 /* caller should free data of krb5_app_req */ 1119 /* 1120 * 20010406 VRS deleted for real KerberosWrapper 20010605 VRS reinstated 1121 * to offer Authenticator to KerberosWrapper 1122 */ 1123 krb5_app_req.length = 0; 1124 if (authenp) { 1125 krb5_data krb5in_data; 1126 const unsigned char *p; 1127 long arlen; 1128 KRB5_APREQBODY *ap_req; 1129 1130 authenp->length = 0; 1131 krb5in_data.data = NULL; 1132 krb5in_data.length = 0; 1133 if ((krb5rc = krb5_mk_req_extended(krb5context, 1134 &krb5auth_context, 0, &krb5in_data, 1135 krb5credsp, &krb5_app_req)) != 0) { 1136 kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ, 1137 "krb5_mk_req_extended() fails.\n"); 1138 goto err; 1139 } 1140 1141 arlen = krb5_app_req.length; 1142 p = (unsigned char *)krb5_app_req.data; 1143 ap_req = (KRB5_APREQBODY *)d2i_KRB5_APREQ(NULL, &p, arlen); 1144 if (ap_req) { 1145 authenp->length = i2d_KRB5_ENCDATA(ap_req->authenticator, NULL); 1146 if (authenp->length && (authenp->data = malloc(authenp->length))) { 1147 unsigned char *adp = (unsigned char *)authenp->data; 1148 authenp->length = 1149 i2d_KRB5_ENCDATA(ap_req->authenticator, &adp); 1150 } 1151 } 1152 1153 if (ap_req) 1154 KRB5_APREQ_free((KRB5_APREQ *) ap_req); 1155 if (krb5_app_req.length) 1156 kssl_krb5_free_data_contents(krb5context, &krb5_app_req); 1157 } 1158# ifdef KRB5_HEIMDAL 1159 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session)) { 1160 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1161 "kssl_ctx_setkey() fails.\n"); 1162 } 1163# else 1164 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock)) { 1165 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1166 "kssl_ctx_setkey() fails.\n"); 1167 } 1168# endif 1169 else 1170 krb5rc = 0; 1171 1172 err: 1173# ifdef KSSL_DEBUG 1174 kssl_ctx_show(kssl_ctx); 1175# endif /* KSSL_DEBUG */ 1176 1177 if (krb5creds.client) 1178 krb5_free_principal(krb5context, krb5creds.client); 1179 if (krb5creds.server) 1180 krb5_free_principal(krb5context, krb5creds.server); 1181 if (krb5auth_context) 1182 krb5_auth_con_free(krb5context, krb5auth_context); 1183 if (krb5context) 1184 krb5_free_context(krb5context); 1185 return (krb5rc); 1186} 1187 1188/*- 1189 * Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket. 1190 * Return Kerberos error code and kssl_err struct on error. 1191 * Allocates krb5_ticket and krb5_principal; caller should free these. 1192 * 1193 * 20010410 VRS Implemented krb5_decode_ticket() as 1194 * old_krb5_decode_ticket(). Missing from MIT1.0.6. 1195 * 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions. 1196 * Re-used some of the old krb5_decode_ticket() 1197 * code here. This tkt should alloc/free just 1198 * like the real thing. 1199 */ 1200krb5_error_code kssl_TKT2tkt( /* IN */ krb5_context krb5context, 1201 /* 1202 * IN 1203 */ KRB5_TKTBODY *asn1ticket, 1204 /* 1205 * OUT 1206 */ krb5_ticket **krb5ticket, 1207 /* 1208 * OUT 1209 */ KSSL_ERR *kssl_err) 1210{ 1211 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1212 krb5_ticket *new5ticket = NULL; 1213 ASN1_GENERALSTRING *gstr_svc, *gstr_host; 1214 1215 *krb5ticket = NULL; 1216 1217 if (asn1ticket == NULL || asn1ticket->realm == NULL || 1218 asn1ticket->sname == NULL || 1219 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2) { 1220 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1221 "Null field in asn1ticket.\n"); 1222 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1223 return KRB5KRB_ERR_GENERIC; 1224 } 1225 1226 if ((new5ticket = (krb5_ticket *)calloc(1, sizeof(krb5_ticket))) == NULL) { 1227 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1228 "Unable to allocate new krb5_ticket.\n"); 1229 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1230 return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */ 1231 } 1232 1233 gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0); 1234 gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1); 1235 1236 if ((krb5rc = kssl_build_principal_2(krb5context, 1237 &new5ticket->server, 1238 asn1ticket->realm->length, 1239 (char *)asn1ticket->realm->data, 1240 gstr_svc->length, 1241 (char *)gstr_svc->data, 1242 gstr_host->length, 1243 (char *)gstr_host->data)) != 0) { 1244 free(new5ticket); 1245 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1246 "Error building ticket server principal.\n"); 1247 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1248 return krb5rc; /* or KRB5KRB_ERR_GENERIC; */ 1249 } 1250 1251 krb5_princ_type(krb5context, new5ticket->server) = 1252 asn1ticket->sname->nametype->data[0]; 1253 new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0]; 1254 new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0]; 1255 new5ticket->enc_part.ciphertext.length = 1256 asn1ticket->encdata->cipher->length; 1257 if ((new5ticket->enc_part.ciphertext.data = 1258 calloc(1, asn1ticket->encdata->cipher->length)) == NULL) { 1259 free(new5ticket); 1260 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1261 "Error allocating cipher in krb5ticket.\n"); 1262 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1263 return KRB5KRB_ERR_GENERIC; 1264 } else { 1265 memcpy(new5ticket->enc_part.ciphertext.data, 1266 asn1ticket->encdata->cipher->data, 1267 asn1ticket->encdata->cipher->length); 1268 } 1269 1270 *krb5ticket = new5ticket; 1271 return 0; 1272} 1273 1274/*- 1275 * Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"), 1276 * and krb5 AP_REQ message & message length, 1277 * Return Kerberos session key and client principle 1278 * to SSL Server in KSSL_CTX *kssl_ctx. 1279 * 1280 * 19990702 VRS Started. 1281 */ 1282krb5_error_code kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1283 /* 1284 * IN 1285 */ krb5_data *indata, 1286 /* 1287 * OUT 1288 */ krb5_ticket_times *ttimes, 1289 /* 1290 * OUT 1291 */ KSSL_ERR *kssl_err) 1292{ 1293 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1294 static krb5_context krb5context = NULL; 1295 static krb5_auth_context krb5auth_context = NULL; 1296 krb5_ticket *krb5ticket = NULL; 1297 KRB5_TKTBODY *asn1ticket = NULL; 1298 const unsigned char *p; 1299 krb5_keytab krb5keytab = NULL; 1300 krb5_keytab_entry kt_entry; 1301 krb5_principal krb5server; 1302 krb5_rcache rcache = NULL; 1303 1304 kssl_err_set(kssl_err, 0, ""); 1305 1306 if (!kssl_ctx) { 1307 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n"); 1308 goto err; 1309 } 1310# ifdef KSSL_DEBUG 1311 printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name)); 1312# endif /* KSSL_DEBUG */ 1313 1314 if (!krb5context && (krb5rc = krb5_init_context(&krb5context))) { 1315 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1316 "krb5_init_context() fails.\n"); 1317 goto err; 1318 } 1319 if (krb5auth_context && 1320 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context))) { 1321 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1322 "krb5_auth_con_free() fails.\n"); 1323 goto err; 1324 } else 1325 krb5auth_context = NULL; 1326 if (!krb5auth_context && 1327 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context))) { 1328 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1329 "krb5_auth_con_init() fails.\n"); 1330 goto err; 1331 } 1332 1333 if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context, 1334 &rcache))) { 1335 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1336 "krb5_auth_con_getrcache() fails.\n"); 1337 goto err; 1338 } 1339 1340 if ((krb5rc = krb5_sname_to_principal(krb5context, NULL, 1341 (kssl_ctx->service_name) ? 1342 kssl_ctx->service_name : KRB5SVC, 1343 KRB5_NT_SRV_HST, 1344 &krb5server)) != 0) { 1345 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1346 "krb5_sname_to_principal() fails.\n"); 1347 goto err; 1348 } 1349 1350 if (rcache == NULL) { 1351 if ((krb5rc = krb5_get_server_rcache(krb5context, 1352 krb5_princ_component(krb5context, 1353 krb5server, 1354 0), 1355 &rcache))) { 1356 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1357 "krb5_get_server_rcache() fails.\n"); 1358 goto err; 1359 } 1360 } 1361 1362 if ((krb5rc = 1363 krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache))) { 1364 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1365 "krb5_auth_con_setrcache() fails.\n"); 1366 goto err; 1367 } 1368 1369 /* 1370 * kssl_ctx->keytab_file == NULL ==> use Kerberos default 1371 */ 1372 if (kssl_ctx->keytab_file) { 1373 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1374 &krb5keytab); 1375 if (krb5rc) { 1376 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1377 "krb5_kt_resolve() fails.\n"); 1378 goto err; 1379 } 1380 } else { 1381 krb5rc = krb5_kt_default(krb5context, &krb5keytab); 1382 if (krb5rc) { 1383 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1384 "krb5_kt_default() fails.\n"); 1385 goto err; 1386 } 1387 } 1388 1389 /*- Actual Kerberos5 krb5_recvauth() has initial conversation here 1390 * o check KRB5_SENDAUTH_BADAUTHVERS 1391 * unless KRB5_RECVAUTH_SKIP_VERSION 1392 * o check KRB5_SENDAUTH_BADAPPLVERS 1393 * o send "0" msg if all OK 1394 */ 1395 1396 /*- 1397 * 20010411 was using AP_REQ instead of true KerberosWrapper 1398 * 1399 * if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context, 1400 * &krb5in_data, krb5server, krb5keytab, 1401 * &ap_option, &krb5ticket)) != 0) { Error } 1402 */ 1403 1404 p = (unsigned char *)indata->data; 1405 if ((asn1ticket = (KRB5_TKTBODY *)d2i_KRB5_TICKET(NULL, &p, 1406 (long)indata->length)) 1407 == NULL) { 1408 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1409 "d2i_KRB5_TICKET() ASN.1 decode failure.\n"); 1410 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1411 goto err; 1412 } 1413 1414 /* 1415 * Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) 1416 */ 1417 if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket, 1418 kssl_err)) != 0) { 1419 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1420 "Error converting ASN.1 ticket to krb5_ticket.\n"); 1421 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1422 goto err; 1423 } 1424 1425 if (!krb5_principal_compare(krb5context, krb5server, krb5ticket->server)) { 1426 krb5rc = KRB5_PRINC_NOMATCH; 1427 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1428 "server principal != ticket principal\n"); 1429 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1430 goto err; 1431 } 1432 if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1433 krb5ticket->server, 1434 krb5ticket->enc_part.kvno, 1435 krb5ticket->enc_part.enctype, 1436 &kt_entry)) != 0) { 1437 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1438 "krb5_kt_get_entry() fails with %x.\n", krb5rc); 1439 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1440 goto err; 1441 } 1442 if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key, 1443 krb5ticket)) != 0) { 1444 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1445 "krb5_decrypt_tkt_part() failed.\n"); 1446 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1447 goto err; 1448 } else { 1449 krb5_kt_free_entry(krb5context, &kt_entry); 1450# ifdef KSSL_DEBUG 1451 { 1452 int i; 1453 krb5_address **paddr = krb5ticket->enc_part2->caddrs; 1454 printf("Decrypted ticket fields:\n"); 1455 printf("\tflags: %X, transit-type: %X", 1456 krb5ticket->enc_part2->flags, 1457 krb5ticket->enc_part2->transited.tr_type); 1458 print_krb5_data("\ttransit-data: ", 1459 &(krb5ticket->enc_part2->transited.tr_contents)); 1460 printf("\tcaddrs: %p, authdata: %p\n", 1461 krb5ticket->enc_part2->caddrs, 1462 krb5ticket->enc_part2->authorization_data); 1463 if (paddr) { 1464 printf("\tcaddrs:\n"); 1465 for (i = 0; paddr[i] != NULL; i++) { 1466 krb5_data d; 1467 d.length = paddr[i]->length; 1468 d.data = paddr[i]->contents; 1469 print_krb5_data("\t\tIP: ", &d); 1470 } 1471 } 1472 printf("\tstart/auth/end times: %d / %d / %d\n", 1473 krb5ticket->enc_part2->times.starttime, 1474 krb5ticket->enc_part2->times.authtime, 1475 krb5ticket->enc_part2->times.endtime); 1476 } 1477# endif /* KSSL_DEBUG */ 1478 } 1479 1480 krb5rc = KRB5_NO_TKT_SUPPLIED; 1481 if (!krb5ticket || !krb5ticket->enc_part2 || 1482 !krb5ticket->enc_part2->client || 1483 !krb5ticket->enc_part2->client->data || 1484 !krb5ticket->enc_part2->session) { 1485 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1486 "bad ticket from krb5_rd_req.\n"); 1487 } else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT, 1488 &krb5ticket->enc_part2->client->realm, 1489 krb5ticket->enc_part2->client->data, 1490 krb5ticket->enc_part2->client->length)) { 1491 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1492 "kssl_ctx_setprinc() fails.\n"); 1493 } else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session)) { 1494 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1495 "kssl_ctx_setkey() fails.\n"); 1496 } else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID) { 1497 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID; 1498 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1499 "invalid ticket from krb5_rd_req.\n"); 1500 } else 1501 krb5rc = 0; 1502 1503 kssl_ctx->enctype = krb5ticket->enc_part.enctype; 1504 ttimes->authtime = krb5ticket->enc_part2->times.authtime; 1505 ttimes->starttime = krb5ticket->enc_part2->times.starttime; 1506 ttimes->endtime = krb5ticket->enc_part2->times.endtime; 1507 ttimes->renew_till = krb5ticket->enc_part2->times.renew_till; 1508 1509 err: 1510# ifdef KSSL_DEBUG 1511 kssl_ctx_show(kssl_ctx); 1512# endif /* KSSL_DEBUG */ 1513 1514 if (asn1ticket) 1515 KRB5_TICKET_free((KRB5_TICKET *) asn1ticket); 1516 if (krb5keytab) 1517 krb5_kt_close(krb5context, krb5keytab); 1518 if (krb5ticket) 1519 krb5_free_ticket(krb5context, krb5ticket); 1520 if (krb5server) 1521 krb5_free_principal(krb5context, krb5server); 1522 return (krb5rc); 1523} 1524 1525/* 1526 * Allocate & return a new kssl_ctx struct. 1527 */ 1528KSSL_CTX *kssl_ctx_new(void) 1529{ 1530 return ((KSSL_CTX *)kssl_calloc(1, sizeof(KSSL_CTX))); 1531} 1532 1533/* 1534 * Frees a kssl_ctx struct and any allocated memory it holds. Returns NULL. 1535 */ 1536KSSL_CTX *kssl_ctx_free(KSSL_CTX *kssl_ctx) 1537{ 1538 if (kssl_ctx == NULL) 1539 return kssl_ctx; 1540 1541 if (kssl_ctx->key) 1542 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length); 1543 if (kssl_ctx->key) 1544 kssl_free(kssl_ctx->key); 1545 if (kssl_ctx->client_princ) 1546 kssl_free(kssl_ctx->client_princ); 1547 if (kssl_ctx->service_host) 1548 kssl_free(kssl_ctx->service_host); 1549 if (kssl_ctx->service_name) 1550 kssl_free(kssl_ctx->service_name); 1551 if (kssl_ctx->keytab_file) 1552 kssl_free(kssl_ctx->keytab_file); 1553 1554 kssl_free(kssl_ctx); 1555 return (KSSL_CTX *)NULL; 1556} 1557 1558/* 1559 * Given an array of (krb5_data *) entity (and optional realm), set the plain 1560 * (char *) client_princ or service_host member of the kssl_ctx struct. 1561 */ 1562krb5_error_code 1563kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which, 1564 krb5_data *realm, krb5_data *entity, int nentities) 1565{ 1566 char **princ; 1567 int length; 1568 int i; 1569 1570 if (kssl_ctx == NULL || entity == NULL) 1571 return KSSL_CTX_ERR; 1572 1573 switch (which) { 1574 case KSSL_CLIENT: 1575 princ = &kssl_ctx->client_princ; 1576 break; 1577 case KSSL_SERVER: 1578 princ = &kssl_ctx->service_host; 1579 break; 1580 default: 1581 return KSSL_CTX_ERR; 1582 break; 1583 } 1584 if (*princ) 1585 kssl_free(*princ); 1586 1587 /* Add up all the entity->lengths */ 1588 length = 0; 1589 for (i = 0; i < nentities; i++) { 1590 length += entity[i].length; 1591 } 1592 /* Add in space for the '/' character(s) (if any) */ 1593 length += nentities - 1; 1594 /* Space for the ('@'+realm+NULL | NULL) */ 1595 length += ((realm) ? realm->length + 2 : 1); 1596 1597 if ((*princ = kssl_calloc(1, length)) == NULL) 1598 return KSSL_CTX_ERR; 1599 else { 1600 for (i = 0; i < nentities; i++) { 1601 strncat(*princ, entity[i].data, entity[i].length); 1602 if (i < nentities - 1) { 1603 strcat(*princ, "/"); 1604 } 1605 } 1606 if (realm) { 1607 strcat(*princ, "@"); 1608 (void)strncat(*princ, realm->data, realm->length); 1609 } 1610 } 1611 1612 return KSSL_CTX_OK; 1613} 1614 1615/*- Set one of the plain (char *) string members of the kssl_ctx struct. 1616 * Default values should be: 1617 * which == KSSL_SERVICE => "khost" (KRB5SVC) 1618 * which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB) 1619 */ 1620krb5_error_code kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text) 1621{ 1622 char **string; 1623 1624 if (!kssl_ctx) 1625 return KSSL_CTX_ERR; 1626 1627 switch (which) { 1628 case KSSL_SERVICE: 1629 string = &kssl_ctx->service_name; 1630 break; 1631 case KSSL_SERVER: 1632 string = &kssl_ctx->service_host; 1633 break; 1634 case KSSL_CLIENT: 1635 string = &kssl_ctx->client_princ; 1636 break; 1637 case KSSL_KEYTAB: 1638 string = &kssl_ctx->keytab_file; 1639 break; 1640 default: 1641 return KSSL_CTX_ERR; 1642 break; 1643 } 1644 if (*string) 1645 kssl_free(*string); 1646 1647 if (!text) { 1648 *string = '\0'; 1649 return KSSL_CTX_OK; 1650 } 1651 1652 if ((*string = kssl_calloc(1, strlen(text) + 1)) == NULL) 1653 return KSSL_CTX_ERR; 1654 else 1655 strcpy(*string, text); 1656 1657 return KSSL_CTX_OK; 1658} 1659 1660/* 1661 * Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx 1662 * struct. Clear kssl_ctx->key if Kerberos session key is NULL. 1663 */ 1664krb5_error_code kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session) 1665{ 1666 int length; 1667 krb5_enctype enctype; 1668 krb5_octet FAR *contents = NULL; 1669 1670 if (!kssl_ctx) 1671 return KSSL_CTX_ERR; 1672 1673 if (kssl_ctx->key) { 1674 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length); 1675 kssl_free(kssl_ctx->key); 1676 } 1677 1678 if (session) { 1679 1680# ifdef KRB5_HEIMDAL 1681 length = session->keyvalue->length; 1682 enctype = session->keytype; 1683 contents = session->keyvalue->contents; 1684# else 1685 length = session->length; 1686 enctype = session->enctype; 1687 contents = session->contents; 1688# endif 1689 kssl_ctx->enctype = enctype; 1690 kssl_ctx->length = length; 1691 } else { 1692 kssl_ctx->enctype = ENCTYPE_UNKNOWN; 1693 kssl_ctx->length = 0; 1694 return KSSL_CTX_OK; 1695 } 1696 1697 if ((kssl_ctx->key = 1698 (krb5_octet FAR *)kssl_calloc(1, kssl_ctx->length)) == NULL) { 1699 kssl_ctx->length = 0; 1700 return KSSL_CTX_ERR; 1701 } else 1702 memcpy(kssl_ctx->key, contents, length); 1703 1704 return KSSL_CTX_OK; 1705} 1706 1707/* 1708 * Display contents of kssl_ctx struct 1709 */ 1710void kssl_ctx_show(KSSL_CTX *kssl_ctx) 1711{ 1712 int i; 1713 1714 printf("kssl_ctx: "); 1715 if (kssl_ctx == NULL) { 1716 printf("NULL\n"); 1717 return; 1718 } else 1719 printf("%p\n", (void *)kssl_ctx); 1720 1721 printf("\tservice:\t%s\n", 1722 (kssl_ctx->service_name) ? kssl_ctx->service_name : "NULL"); 1723 printf("\tclient:\t%s\n", 1724 (kssl_ctx->client_princ) ? kssl_ctx->client_princ : "NULL"); 1725 printf("\tserver:\t%s\n", 1726 (kssl_ctx->service_host) ? kssl_ctx->service_host : "NULL"); 1727 printf("\tkeytab:\t%s\n", 1728 (kssl_ctx->keytab_file) ? kssl_ctx->keytab_file : "NULL"); 1729 printf("\tkey [%d:%d]:\t", kssl_ctx->enctype, kssl_ctx->length); 1730 1731 for (i = 0; i < kssl_ctx->length && kssl_ctx->key; i++) { 1732 printf("%02x", kssl_ctx->key[i]); 1733 } 1734 printf("\n"); 1735 return; 1736} 1737 1738int kssl_keytab_is_available(KSSL_CTX *kssl_ctx) 1739{ 1740 krb5_context krb5context = NULL; 1741 krb5_keytab krb5keytab = NULL; 1742 krb5_keytab_entry entry; 1743 krb5_principal princ = NULL; 1744 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1745 int rc = 0; 1746 1747 if ((krb5rc = krb5_init_context(&krb5context))) 1748 return (0); 1749 1750 /* 1751 * kssl_ctx->keytab_file == NULL ==> use Kerberos default 1752 */ 1753 if (kssl_ctx->keytab_file) { 1754 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1755 &krb5keytab); 1756 if (krb5rc) 1757 goto exit; 1758 } else { 1759 krb5rc = krb5_kt_default(krb5context, &krb5keytab); 1760 if (krb5rc) 1761 goto exit; 1762 } 1763 1764 /* the host key we are looking for */ 1765 krb5rc = krb5_sname_to_principal(krb5context, NULL, 1766 kssl_ctx-> 1767 service_name ? kssl_ctx->service_name : 1768 KRB5SVC, KRB5_NT_SRV_HST, &princ); 1769 1770 if (krb5rc) 1771 goto exit; 1772 1773 krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, princ, 1774 /* IGNORE_VNO */ 1775 0, 1776 /* IGNORE_ENCTYPE */ 1777 0, &entry); 1778 if (krb5rc == KRB5_KT_NOTFOUND) { 1779 rc = 1; 1780 goto exit; 1781 } else if (krb5rc) 1782 goto exit; 1783 1784 krb5_kt_free_entry(krb5context, &entry); 1785 rc = 1; 1786 1787 exit: 1788 if (krb5keytab) 1789 krb5_kt_close(krb5context, krb5keytab); 1790 if (princ) 1791 krb5_free_principal(krb5context, princ); 1792 if (krb5context) 1793 krb5_free_context(krb5context); 1794 return (rc); 1795} 1796 1797int kssl_tgt_is_available(KSSL_CTX *kssl_ctx) 1798{ 1799 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1800 krb5_context krb5context = NULL; 1801 krb5_ccache krb5ccdef = NULL; 1802 krb5_creds krb5creds, *krb5credsp = NULL; 1803 int rc = 0; 1804 1805 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1806 1807 if (!kssl_ctx) 1808 return (0); 1809 1810 if (!kssl_ctx->service_host) 1811 return (0); 1812 1813 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1814 goto err; 1815 1816 if ((krb5rc = krb5_sname_to_principal(krb5context, 1817 kssl_ctx->service_host, 1818 (kssl_ctx->service_name) ? 1819 kssl_ctx->service_name : KRB5SVC, 1820 KRB5_NT_SRV_HST, 1821 &krb5creds.server)) != 0) 1822 goto err; 1823 1824 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1825 goto err; 1826 1827 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1828 &krb5creds.client)) != 0) 1829 goto err; 1830 1831 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1832 &krb5creds, &krb5credsp)) != 0) 1833 goto err; 1834 1835 rc = 1; 1836 1837 err: 1838# ifdef KSSL_DEBUG 1839 kssl_ctx_show(kssl_ctx); 1840# endif /* KSSL_DEBUG */ 1841 1842 if (krb5creds.client) 1843 krb5_free_principal(krb5context, krb5creds.client); 1844 if (krb5creds.server) 1845 krb5_free_principal(krb5context, krb5creds.server); 1846 if (krb5context) 1847 krb5_free_context(krb5context); 1848 return (rc); 1849} 1850 1851# if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32) 1852void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data) 1853{ 1854# ifdef KRB5_HEIMDAL 1855 data->length = 0; 1856 if (data->data) 1857 free(data->data); 1858# elif defined(KRB5_MIT_OLD11) 1859 if (data->data) { 1860 krb5_xfree(data->data); 1861 data->data = 0; 1862 } 1863# else 1864 krb5_free_data_contents(NULL, data); 1865# endif 1866} 1867# endif 1868/* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */ 1869 1870/* 1871 * Given pointers to KerberosTime and struct tm structs, convert the 1872 * KerberosTime string to struct tm. Note that KerberosTime is a 1873 * ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional seconds 1874 * as defined in RFC 1510. Return pointer to the (partially) filled in 1875 * struct tm on success, return NULL on failure. 1876 */ 1877struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm) 1878{ 1879 char c, *p; 1880 1881 if (!k_tm) 1882 return NULL; 1883 if (gtime == NULL || gtime->length < 14) 1884 return NULL; 1885 if (gtime->data == NULL) 1886 return NULL; 1887 1888 p = (char *)>ime->data[14]; 1889 1890 c = *p; 1891 *p = '\0'; 1892 p -= 2; 1893 k_tm->tm_sec = atoi(p); 1894 *(p + 2) = c; 1895 c = *p; 1896 *p = '\0'; 1897 p -= 2; 1898 k_tm->tm_min = atoi(p); 1899 *(p + 2) = c; 1900 c = *p; 1901 *p = '\0'; 1902 p -= 2; 1903 k_tm->tm_hour = atoi(p); 1904 *(p + 2) = c; 1905 c = *p; 1906 *p = '\0'; 1907 p -= 2; 1908 k_tm->tm_mday = atoi(p); 1909 *(p + 2) = c; 1910 c = *p; 1911 *p = '\0'; 1912 p -= 2; 1913 k_tm->tm_mon = atoi(p) - 1; 1914 *(p + 2) = c; 1915 c = *p; 1916 *p = '\0'; 1917 p -= 4; 1918 k_tm->tm_year = atoi(p) - 1900; 1919 *(p + 4) = c; 1920 1921 return k_tm; 1922} 1923 1924/* 1925 * Helper function for kssl_validate_times(). We need context->clockskew, 1926 * but krb5_context is an opaque struct. So we try to sneek the clockskew 1927 * out through the replay cache. If that fails just return a likely default 1928 * (300 seconds). 1929 */ 1930krb5_deltat get_rc_clockskew(krb5_context context) 1931{ 1932 krb5_rcache rc; 1933 krb5_deltat clockskew; 1934 1935 if (krb5_rc_default(context, &rc)) 1936 return KSSL_CLOCKSKEW; 1937 if (krb5_rc_initialize(context, rc, 0)) 1938 return KSSL_CLOCKSKEW; 1939 if (krb5_rc_get_lifespan(context, rc, &clockskew)) { 1940 clockskew = KSSL_CLOCKSKEW; 1941 } 1942 (void)krb5_rc_destroy(context, rc); 1943 return clockskew; 1944} 1945 1946/* 1947 * kssl_validate_times() combines (and more importantly exposes) the MIT KRB5 1948 * internal function krb5_validate_times() and the in_clock_skew() macro. 1949 * The authenticator client time is checked to be within clockskew secs of 1950 * the current time and the current time is checked to be within the ticket 1951 * start and expire times. Either check may be omitted by supplying a NULL 1952 * value. Returns 0 for valid times, SSL_R_KRB5* error codes otherwise. See 1953 * Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c 20010420 VRS 1954 */ 1955krb5_error_code kssl_validate_times(krb5_timestamp atime, 1956 krb5_ticket_times *ttimes) 1957{ 1958 krb5_deltat skew; 1959 krb5_timestamp start, now; 1960 krb5_error_code rc; 1961 krb5_context context; 1962 1963 if ((rc = krb5_init_context(&context))) 1964 return SSL_R_KRB5_S_BAD_TICKET; 1965 skew = get_rc_clockskew(context); 1966 if ((rc = krb5_timeofday(context, &now))) 1967 return SSL_R_KRB5_S_BAD_TICKET; 1968 krb5_free_context(context); 1969 1970 if (atime && labs(atime - now) >= skew) 1971 return SSL_R_KRB5_S_TKT_SKEW; 1972 1973 if (!ttimes) 1974 return 0; 1975 1976 start = (ttimes->starttime != 0) ? ttimes->starttime : ttimes->authtime; 1977 if (start - now > skew) 1978 return SSL_R_KRB5_S_TKT_NYV; 1979 if ((now - ttimes->endtime) > skew) 1980 return SSL_R_KRB5_S_TKT_EXPIRED; 1981 1982# ifdef KSSL_DEBUG 1983 printf("kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n", 1984 start, atime, now, skew, ttimes->endtime); 1985# endif /* KSSL_DEBUG */ 1986 1987 return 0; 1988} 1989 1990/* 1991 * Decode and decrypt given DER-encoded authenticator, then pass 1992 * authenticator ctime back in *atimep (or 0 if time unavailable). Returns 1993 * krb5_error_code and kssl_err on error. A NULL authenticator 1994 * (authentp->length == 0) is not considered an error. Note that 1995 * kssl_check_authent() makes use of the KRB5 session key; you must call 1996 * kssl_sget_tkt() to get the key before calling this routine. 1997 */ 1998krb5_error_code kssl_check_authent( 1999 /* 2000 * IN 2001 */ KSSL_CTX *kssl_ctx, 2002 /* 2003 * IN 2004 */ krb5_data *authentp, 2005 /* 2006 * OUT 2007 */ krb5_timestamp *atimep, 2008 /* 2009 * OUT 2010 */ KSSL_ERR *kssl_err) 2011{ 2012 krb5_error_code krb5rc = 0; 2013 KRB5_ENCDATA *dec_authent = NULL; 2014 KRB5_AUTHENTBODY *auth = NULL; 2015 krb5_enctype enctype; 2016 EVP_CIPHER_CTX ciph_ctx; 2017 const EVP_CIPHER *enc = NULL; 2018 unsigned char iv[EVP_MAX_IV_LENGTH]; 2019 const unsigned char *p; 2020 unsigned char *unenc_authent; 2021 int outl, unencbufsize; 2022 struct tm tm_time, *tm_l, *tm_g; 2023 time_t now, tl, tg, tr, tz_offset; 2024 2025 EVP_CIPHER_CTX_init(&ciph_ctx); 2026 *atimep = 0; 2027 kssl_err_set(kssl_err, 0, ""); 2028 2029# ifndef KRB5CHECKAUTH 2030 authentp = NULL; 2031# else 2032# if KRB5CHECKAUTH == 0 2033 authentp = NULL; 2034# endif 2035# endif /* KRB5CHECKAUTH */ 2036 2037 if (authentp == NULL || authentp->length == 0) 2038 return 0; 2039 2040# ifdef KSSL_DEBUG 2041 { 2042 unsigned int ui; 2043 printf("kssl_check_authent: authenticator[%d]:\n", authentp->length); 2044 p = authentp->data; 2045 for (ui = 0; ui < authentp->length; ui++) 2046 printf("%02x ", p[ui]); 2047 printf("\n"); 2048 } 2049# endif /* KSSL_DEBUG */ 2050 2051 unencbufsize = 2 * authentp->length; 2052 if ((unenc_authent = calloc(1, unencbufsize)) == NULL) { 2053 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2054 "Unable to allocate authenticator buffer.\n"); 2055 krb5rc = KRB5KRB_ERR_GENERIC; 2056 goto err; 2057 } 2058 2059 p = (unsigned char *)authentp->data; 2060 if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p, 2061 (long)authentp->length)) == NULL) { 2062 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2063 "Error decoding authenticator.\n"); 2064 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2065 goto err; 2066 } 2067 2068 enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */ 2069# if !defined(KRB5_MIT_OLD11) 2070 switch (enctype) { 2071 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 2072 case ENCTYPE_DES3_CBC_SHA: 2073 case ENCTYPE_DES3_CBC_RAW: 2074 krb5rc = 0; /* Skip, can't handle derived keys */ 2075 goto err; 2076 } 2077# endif 2078 enc = kssl_map_enc(enctype); 2079 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2080 2081 if (enc == NULL) { 2082 /* 2083 * Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1. This 2084 * enctype indicates the authenticator was encrypted using key-usage 2085 * derived keys which openssl cannot decrypt. 2086 */ 2087 goto err; 2088 } 2089 2090 if (!EVP_CipherInit(&ciph_ctx, enc, kssl_ctx->key, iv, 0)) { 2091 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2092 "EVP_CipherInit error decrypting authenticator.\n"); 2093 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2094 goto err; 2095 } 2096 outl = dec_authent->cipher->length; 2097 if (!EVP_Cipher 2098 (&ciph_ctx, unenc_authent, dec_authent->cipher->data, outl)) { 2099 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2100 "EVP_Cipher error decrypting authenticator.\n"); 2101 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2102 goto err; 2103 } 2104 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2105 2106# ifdef KSSL_DEBUG 2107 printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl); 2108 for (padl = 0; padl < outl; padl++) 2109 printf("%02x ", unenc_authent[padl]); 2110 printf("\n"); 2111# endif /* KSSL_DEBUG */ 2112 2113 if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL) { 2114 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2115 "confounded by authenticator.\n"); 2116 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2117 goto err; 2118 } 2119 outl -= p - unenc_authent; 2120 2121 if ((auth = (KRB5_AUTHENTBODY *)d2i_KRB5_AUTHENT(NULL, &p, 2122 (long)outl)) == NULL) { 2123 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2124 "Error decoding authenticator body.\n"); 2125 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2126 goto err; 2127 } 2128 2129 memset(&tm_time, 0, sizeof(struct tm)); 2130 if (k_gmtime(auth->ctime, &tm_time) && 2131 ((tr = mktime(&tm_time)) != (time_t)(-1))) { 2132 now = time(&now); 2133 tm_l = localtime(&now); 2134 tl = mktime(tm_l); 2135 tm_g = gmtime(&now); 2136 tg = mktime(tm_g); 2137 tz_offset = tg - tl; 2138 2139 *atimep = tr - tz_offset; 2140 } 2141# ifdef KSSL_DEBUG 2142 printf("kssl_check_authent: returns %d for client time ", *atimep); 2143 if (auth && auth->ctime && auth->ctime->length && auth->ctime->data) 2144 printf("%.*s\n", auth->ctime->length, auth->ctime->data); 2145 else 2146 printf("NULL\n"); 2147# endif /* KSSL_DEBUG */ 2148 2149 err: 2150 if (auth) 2151 KRB5_AUTHENT_free((KRB5_AUTHENT *) auth); 2152 if (dec_authent) 2153 KRB5_ENCDATA_free(dec_authent); 2154 if (unenc_authent) 2155 free(unenc_authent); 2156 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2157 return krb5rc; 2158} 2159 2160/* 2161 * Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host), 2162 * because I don't know how to stub varargs. Returns krb5_error_code == 2163 * ENOMEM on alloc error, otherwise passes back newly constructed principal, 2164 * which should be freed by caller. 2165 */ 2166krb5_error_code kssl_build_principal_2( 2167 /* 2168 * UPDATE 2169 */ krb5_context context, 2170 /* 2171 * OUT 2172 */ krb5_principal *princ, 2173 /* 2174 * IN 2175 */ int rlen, const char *realm, 2176 /* 2177 * IN 2178 */ int slen, const char *svc, 2179 /* 2180 * IN 2181 */ int hlen, const char *host) 2182{ 2183 krb5_data *p_data = NULL; 2184 krb5_principal new_p = NULL; 2185 char *new_r = NULL; 2186 2187 if ((p_data = (krb5_data *)calloc(2, sizeof(krb5_data))) == NULL || 2188 (new_p = (krb5_principal)calloc(1, sizeof(krb5_principal_data))) 2189 == NULL) 2190 goto err; 2191 new_p->length = 2; 2192 new_p->data = p_data; 2193 2194 if ((new_r = calloc(1, rlen + 1)) == NULL) 2195 goto err; 2196 memcpy(new_r, realm, rlen); 2197 krb5_princ_set_realm_length(context, new_p, rlen); 2198 krb5_princ_set_realm_data(context, new_p, new_r); 2199 2200 if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) 2201 goto err; 2202 memcpy(new_p->data[0].data, svc, slen); 2203 new_p->data[0].length = slen; 2204 2205 if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) 2206 goto err; 2207 memcpy(new_p->data[1].data, host, hlen); 2208 new_p->data[1].length = hlen; 2209 2210 krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN; 2211 *princ = new_p; 2212 return 0; 2213 2214 err: 2215 if (new_p && new_p[0].data) 2216 free(new_p[0].data); 2217 if (new_p && new_p[1].data) 2218 free(new_p[1].data); 2219 if (new_p) 2220 free(new_p); 2221 if (new_r) 2222 free(new_r); 2223 return ENOMEM; 2224} 2225 2226#else /* !OPENSSL_NO_KRB5 */ 2227 2228# if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS) 2229static void *dummy = &dummy; 2230# endif 2231 2232#endif /* !OPENSSL_NO_KRB5 */ 2233