kssl.c revision 120631
1/* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */ 2/* Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 2000. 3 */ 4/* ==================================================================== 5 * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * 3. All advertising materials mentioning features or use of this 20 * software must display the following acknowledgment: 21 * "This product includes software developed by the OpenSSL Project 22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 23 * 24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25 * endorse or promote products derived from this software without 26 * prior written permission. For written permission, please contact 27 * licensing@OpenSSL.org. 28 * 29 * 5. Products derived from this software may not be called "OpenSSL" 30 * nor may "OpenSSL" appear in their names without prior written 31 * permission of the OpenSSL Project. 32 * 33 * 6. Redistributions of any form whatsoever must retain the following 34 * acknowledgment: 35 * "This product includes software developed by the OpenSSL Project 36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49 * OF THE POSSIBILITY OF SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This product includes cryptographic software written by Eric Young 53 * (eay@cryptsoft.com). This product includes software written by Tim 54 * Hudson (tjh@cryptsoft.com). 55 * 56 */ 57 58 59/* ssl/kssl.c -- Routines to support (& debug) Kerberos5 auth for openssl 60** 61** 19990701 VRS Started. 62** 200011?? Jeffrey Altman, Richard Levitte 63** Generalized for Heimdal, Newer MIT, & Win32. 64** Integrated into main OpenSSL 0.9.7 snapshots. 65** 20010413 Simon Wilkinson, VRS 66** Real RFC2712 KerberosWrapper replaces AP_REQ. 67*/ 68 69#include <openssl/opensslconf.h> 70 71#define _XOPEN_SOURCE /* glibc2 needs this to declare strptime() */ 72#include <time.h> 73#undef _XOPEN_SOURCE /* To avoid clashes with anything else... */ 74#include <string.h> 75 76#include <openssl/ssl.h> 77#include <openssl/evp.h> 78#include <openssl/objects.h> 79#include <openssl/krb5_asn.h> 80 81#ifndef OPENSSL_NO_KRB5 82 83/* 84 * When OpenSSL is built on Windows, we do not want to require that 85 * the Kerberos DLLs be available in order for the OpenSSL DLLs to 86 * work. Therefore, all Kerberos routines are loaded at run time 87 * and we do not link to a .LIB file. 88 */ 89 90#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) 91/* 92 * The purpose of the following pre-processor statements is to provide 93 * compatibility with different releases of MIT Kerberos for Windows. 94 * All versions up to 1.2 used macros. But macros do not allow for 95 * a binary compatible interface for DLLs. Therefore, all macros are 96 * being replaced by function calls. The following code will allow 97 * an OpenSSL DLL built on Windows to work whether or not the macro 98 * or function form of the routines are utilized. 99 */ 100#ifdef krb5_cc_get_principal 101#define NO_DEF_KRB5_CCACHE 102#undef krb5_cc_get_principal 103#endif 104#define krb5_cc_get_principal kssl_krb5_cc_get_principal 105 106#define krb5_free_data_contents kssl_krb5_free_data_contents 107#define krb5_free_context kssl_krb5_free_context 108#define krb5_auth_con_free kssl_krb5_auth_con_free 109#define krb5_free_principal kssl_krb5_free_principal 110#define krb5_mk_req_extended kssl_krb5_mk_req_extended 111#define krb5_get_credentials kssl_krb5_get_credentials 112#define krb5_cc_default kssl_krb5_cc_default 113#define krb5_sname_to_principal kssl_krb5_sname_to_principal 114#define krb5_init_context kssl_krb5_init_context 115#define krb5_free_ticket kssl_krb5_free_ticket 116#define krb5_rd_req kssl_krb5_rd_req 117#define krb5_kt_default kssl_krb5_kt_default 118#define krb5_kt_resolve kssl_krb5_kt_resolve 119/* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */ 120#ifndef krb5_kt_close 121#define krb5_kt_close kssl_krb5_kt_close 122#endif /* krb5_kt_close */ 123#ifndef krb5_kt_get_entry 124#define krb5_kt_get_entry kssl_krb5_kt_get_entry 125#endif /* krb5_kt_get_entry */ 126#define krb5_auth_con_init kssl_krb5_auth_con_init 127 128#define krb5_principal_compare kssl_krb5_principal_compare 129#define krb5_decrypt_tkt_part kssl_krb5_decrypt_tkt_part 130#define krb5_timeofday kssl_krb5_timeofday 131#define krb5_rc_default kssl_krb5_rc_default 132 133#ifdef krb5_rc_initialize 134#undef krb5_rc_initialize 135#endif 136#define krb5_rc_initialize kssl_krb5_rc_initialize 137 138#ifdef krb5_rc_get_lifespan 139#undef krb5_rc_get_lifespan 140#endif 141#define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan 142 143#ifdef krb5_rc_destroy 144#undef krb5_rc_destroy 145#endif 146#define krb5_rc_destroy kssl_krb5_rc_destroy 147 148#define valid_cksumtype kssl_valid_cksumtype 149#define krb5_checksum_size kssl_krb5_checksum_size 150#define krb5_kt_free_entry kssl_krb5_kt_free_entry 151#define krb5_auth_con_setrcache kssl_krb5_auth_con_setrcache 152#define krb5_auth_con_getrcache kssl_krb5_auth_con_getrcache 153#define krb5_get_server_rcache kssl_krb5_get_server_rcache 154 155/* Prototypes for built in stubs */ 156void kssl_krb5_free_data_contents(krb5_context, krb5_data *); 157void kssl_krb5_free_principal(krb5_context, krb5_principal ); 158krb5_error_code kssl_krb5_kt_resolve(krb5_context, 159 krb5_const char *, 160 krb5_keytab *); 161krb5_error_code kssl_krb5_kt_default(krb5_context, 162 krb5_keytab *); 163krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *); 164krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, 165 krb5_const krb5_data *, 166 krb5_const_principal, krb5_keytab, 167 krb5_flags *,krb5_ticket **); 168 169krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal, 170 krb5_const_principal); 171krb5_error_code kssl_krb5_mk_req_extended(krb5_context, 172 krb5_auth_context *, 173 krb5_const krb5_flags, 174 krb5_data *, 175 krb5_creds *, 176 krb5_data * ); 177krb5_error_code kssl_krb5_init_context(krb5_context *); 178void kssl_krb5_free_context(krb5_context); 179krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache *); 180krb5_error_code kssl_krb5_sname_to_principal(krb5_context, 181 krb5_const char *, 182 krb5_const char *, 183 krb5_int32, 184 krb5_principal *); 185krb5_error_code kssl_krb5_get_credentials(krb5_context, 186 krb5_const krb5_flags, 187 krb5_ccache, 188 krb5_creds *, 189 krb5_creds * *); 190krb5_error_code kssl_krb5_auth_con_init(krb5_context, 191 krb5_auth_context *); 192krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, 193 krb5_ccache cache, 194 krb5_principal *principal); 195krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context); 196size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype); 197krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype); 198krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * ); 199krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context, 200 krb5_auth_context, 201 krb5_rcache); 202krb5_error_code kssl_krb5_get_server_rcache(krb5_context, 203 krb5_const krb5_data *, 204 krb5_rcache *); 205krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context, 206 krb5_auth_context, 207 krb5_rcache *); 208 209/* Function pointers (almost all Kerberos functions are _stdcall) */ 210static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *) 211 =NULL; 212static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal ) 213 =NULL; 214static krb5_error_code(_stdcall *p_krb5_kt_resolve) 215 (krb5_context, krb5_const char *, krb5_keytab *)=NULL; 216static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context, 217 krb5_keytab *)=NULL; 218static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context, 219 krb5_ticket *)=NULL; 220static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context, 221 krb5_auth_context *, 222 krb5_const krb5_data *, 223 krb5_const_principal, 224 krb5_keytab, krb5_flags *, 225 krb5_ticket **)=NULL; 226static krb5_error_code (_stdcall *p_krb5_mk_req_extended) 227 (krb5_context, krb5_auth_context *, 228 krb5_const krb5_flags, krb5_data *, krb5_creds *, 229 krb5_data * )=NULL; 230static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL; 231static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL; 232static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context, 233 krb5_ccache *)=NULL; 234static krb5_error_code (_stdcall *p_krb5_sname_to_principal) 235 (krb5_context, krb5_const char *, krb5_const char *, 236 krb5_int32, krb5_principal *)=NULL; 237static krb5_error_code (_stdcall *p_krb5_get_credentials) 238 (krb5_context, krb5_const krb5_flags, krb5_ccache, 239 krb5_creds *, krb5_creds **)=NULL; 240static krb5_error_code (_stdcall *p_krb5_auth_con_init) 241 (krb5_context, krb5_auth_context *)=NULL; 242static krb5_error_code (_stdcall *p_krb5_cc_get_principal) 243 (krb5_context context, krb5_ccache cache, 244 krb5_principal *principal)=NULL; 245static krb5_error_code (_stdcall *p_krb5_auth_con_free) 246 (krb5_context, krb5_auth_context)=NULL; 247static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part) 248 (krb5_context, krb5_const krb5_keyblock *, 249 krb5_ticket *)=NULL; 250static krb5_error_code (_stdcall *p_krb5_timeofday) 251 (krb5_context context, krb5_int32 *timeret)=NULL; 252static krb5_error_code (_stdcall *p_krb5_rc_default) 253 (krb5_context context, krb5_rcache *rc)=NULL; 254static krb5_error_code (_stdcall *p_krb5_rc_initialize) 255 (krb5_context context, krb5_rcache rc, 256 krb5_deltat lifespan)=NULL; 257static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan) 258 (krb5_context context, krb5_rcache rc, 259 krb5_deltat *lifespan)=NULL; 260static krb5_error_code (_stdcall *p_krb5_rc_destroy) 261 (krb5_context context, krb5_rcache rc)=NULL; 262static krb5_boolean (_stdcall *p_krb5_principal_compare) 263 (krb5_context, krb5_const_principal, krb5_const_principal)=NULL; 264static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL; 265static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL; 266static krb5_error_code (_stdcall *p_krb5_kt_free_entry) 267 (krb5_context,krb5_keytab_entry * )=NULL; 268static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context, 269 krb5_auth_context, 270 krb5_rcache)=NULL; 271static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context, 272 krb5_const krb5_data *, 273 krb5_rcache *)=NULL; 274static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context, 275 krb5_auth_context, 276 krb5_rcache *)=NULL; 277static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context, 278 krb5_keytab keytab)=NULL; 279static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context, 280 krb5_keytab keytab, 281 krb5_const_principal principal, krb5_kvno vno, 282 krb5_enctype enctype, krb5_keytab_entry *entry)=NULL; 283static int krb5_loaded = 0; /* only attempt to initialize func ptrs once */ 284 285/* Function to Load the Kerberos 5 DLL and initialize function pointers */ 286void 287load_krb5_dll(void) 288 { 289 HANDLE hKRB5_32; 290 291 krb5_loaded++; 292 hKRB5_32 = LoadLibrary("KRB5_32"); 293 if (!hKRB5_32) 294 return; 295 296 (FARPROC) p_krb5_free_data_contents = 297 GetProcAddress( hKRB5_32, "krb5_free_data_contents" ); 298 (FARPROC) p_krb5_free_context = 299 GetProcAddress( hKRB5_32, "krb5_free_context" ); 300 (FARPROC) p_krb5_auth_con_free = 301 GetProcAddress( hKRB5_32, "krb5_auth_con_free" ); 302 (FARPROC) p_krb5_free_principal = 303 GetProcAddress( hKRB5_32, "krb5_free_principal" ); 304 (FARPROC) p_krb5_mk_req_extended = 305 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" ); 306 (FARPROC) p_krb5_get_credentials = 307 GetProcAddress( hKRB5_32, "krb5_get_credentials" ); 308 (FARPROC) p_krb5_cc_get_principal = 309 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" ); 310 (FARPROC) p_krb5_cc_default = 311 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 = 319 GetProcAddress( hKRB5_32, "krb5_rd_req" ); 320 (FARPROC) p_krb5_principal_compare = 321 GetProcAddress( hKRB5_32, "krb5_principal_compare" ); 322 (FARPROC) p_krb5_decrypt_tkt_part = 323 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" ); 324 (FARPROC) p_krb5_timeofday = 325 GetProcAddress( hKRB5_32, "krb5_timeofday" ); 326 (FARPROC) p_krb5_rc_default = 327 GetProcAddress( hKRB5_32, "krb5_rc_default" ); 328 (FARPROC) p_krb5_rc_initialize = 329 GetProcAddress( hKRB5_32, "krb5_rc_initialize" ); 330 (FARPROC) p_krb5_rc_get_lifespan = 331 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" ); 332 (FARPROC) p_krb5_rc_destroy = 333 GetProcAddress( hKRB5_32, "krb5_rc_destroy" ); 334 (FARPROC) p_krb5_kt_default = 335 GetProcAddress( hKRB5_32, "krb5_kt_default" ); 336 (FARPROC) p_krb5_kt_resolve = 337 GetProcAddress( hKRB5_32, "krb5_kt_resolve" ); 338 (FARPROC) p_krb5_auth_con_init = 339 GetProcAddress( hKRB5_32, "krb5_auth_con_init" ); 340 (FARPROC) p_valid_cksumtype = 341 GetProcAddress( hKRB5_32, "valid_cksumtype" ); 342 (FARPROC) p_krb5_checksum_size = 343 GetProcAddress( hKRB5_32, "krb5_checksum_size" ); 344 (FARPROC) p_krb5_kt_free_entry = 345 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" ); 346 (FARPROC) p_krb5_auth_con_setrcache = 347 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" ); 348 (FARPROC) p_krb5_get_server_rcache = 349 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" ); 350 (FARPROC) p_krb5_auth_con_getrcache = 351 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" ); 352 (FARPROC) p_krb5_kt_close = 353 GetProcAddress( hKRB5_32, "krb5_kt_close" ); 354 (FARPROC) p_krb5_kt_get_entry = 355 GetProcAddress( hKRB5_32, "krb5_kt_get_entry" ); 356 } 357 358/* Stubs for each function to be dynamicly loaded */ 359void 360kssl_krb5_free_data_contents(krb5_context CO, krb5_data * data) 361 { 362 if (!krb5_loaded) 363 load_krb5_dll(); 364 365 if ( p_krb5_free_data_contents ) 366 p_krb5_free_data_contents(CO,data); 367 } 368 369krb5_error_code 370kssl_krb5_mk_req_extended (krb5_context CO, 371 krb5_auth_context * pACO, 372 krb5_const krb5_flags F, 373 krb5_data * pD1, 374 krb5_creds * pC, 375 krb5_data * pD2) 376 { 377 if (!krb5_loaded) 378 load_krb5_dll(); 379 380 if ( p_krb5_mk_req_extended ) 381 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2)); 382 else 383 return KRB5KRB_ERR_GENERIC; 384 } 385krb5_error_code 386kssl_krb5_auth_con_init(krb5_context CO, 387 krb5_auth_context * pACO) 388 { 389 if (!krb5_loaded) 390 load_krb5_dll(); 391 392 if ( p_krb5_auth_con_init ) 393 return(p_krb5_auth_con_init(CO,pACO)); 394 else 395 return KRB5KRB_ERR_GENERIC; 396 } 397krb5_error_code 398kssl_krb5_auth_con_free (krb5_context CO, 399 krb5_auth_context ACO) 400 { 401 if (!krb5_loaded) 402 load_krb5_dll(); 403 404 if ( p_krb5_auth_con_free ) 405 return(p_krb5_auth_con_free(CO,ACO)); 406 else 407 return KRB5KRB_ERR_GENERIC; 408 } 409krb5_error_code 410kssl_krb5_get_credentials(krb5_context CO, 411 krb5_const krb5_flags F, 412 krb5_ccache CC, 413 krb5_creds * pCR, 414 krb5_creds ** ppCR) 415 { 416 if (!krb5_loaded) 417 load_krb5_dll(); 418 419 if ( p_krb5_get_credentials ) 420 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR)); 421 else 422 return KRB5KRB_ERR_GENERIC; 423 } 424krb5_error_code 425kssl_krb5_sname_to_principal(krb5_context CO, 426 krb5_const char * pC1, 427 krb5_const char * pC2, 428 krb5_int32 I, 429 krb5_principal * pPR) 430 { 431 if (!krb5_loaded) 432 load_krb5_dll(); 433 434 if ( p_krb5_sname_to_principal ) 435 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR)); 436 else 437 return KRB5KRB_ERR_GENERIC; 438 } 439 440krb5_error_code 441kssl_krb5_cc_default(krb5_context CO, 442 krb5_ccache * pCC) 443 { 444 if (!krb5_loaded) 445 load_krb5_dll(); 446 447 if ( p_krb5_cc_default ) 448 return(p_krb5_cc_default(CO,pCC)); 449 else 450 return KRB5KRB_ERR_GENERIC; 451 } 452 453krb5_error_code 454kssl_krb5_init_context(krb5_context * pCO) 455 { 456 if (!krb5_loaded) 457 load_krb5_dll(); 458 459 if ( p_krb5_init_context ) 460 return(p_krb5_init_context(pCO)); 461 else 462 return KRB5KRB_ERR_GENERIC; 463 } 464 465void 466kssl_krb5_free_context(krb5_context CO) 467 { 468 if (!krb5_loaded) 469 load_krb5_dll(); 470 471 if ( p_krb5_free_context ) 472 p_krb5_free_context(CO); 473 } 474 475void 476kssl_krb5_free_principal(krb5_context c, krb5_principal p) 477 { 478 if (!krb5_loaded) 479 load_krb5_dll(); 480 481 if ( p_krb5_free_principal ) 482 p_krb5_free_principal(c,p); 483 } 484 485krb5_error_code 486kssl_krb5_kt_resolve(krb5_context con, 487 krb5_const char * sz, 488 krb5_keytab * kt) 489 { 490 if (!krb5_loaded) 491 load_krb5_dll(); 492 493 if ( p_krb5_kt_resolve ) 494 return(p_krb5_kt_resolve(con,sz,kt)); 495 else 496 return KRB5KRB_ERR_GENERIC; 497 } 498 499krb5_error_code 500kssl_krb5_kt_default(krb5_context con, 501 krb5_keytab * kt) 502 { 503 if (!krb5_loaded) 504 load_krb5_dll(); 505 506 if ( p_krb5_kt_default ) 507 return(p_krb5_kt_default(con,kt)); 508 else 509 return KRB5KRB_ERR_GENERIC; 510 } 511 512krb5_error_code 513kssl_krb5_free_ticket(krb5_context con, 514 krb5_ticket * kt) 515 { 516 if (!krb5_loaded) 517 load_krb5_dll(); 518 519 if ( p_krb5_free_ticket ) 520 return(p_krb5_free_ticket(con,kt)); 521 else 522 return KRB5KRB_ERR_GENERIC; 523 } 524 525krb5_error_code 526kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon, 527 krb5_const krb5_data * data, 528 krb5_const_principal princ, krb5_keytab keytab, 529 krb5_flags * flags, krb5_ticket ** pptkt) 530 { 531 if (!krb5_loaded) 532 load_krb5_dll(); 533 534 if ( p_krb5_rd_req ) 535 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt)); 536 else 537 return KRB5KRB_ERR_GENERIC; 538 } 539 540krb5_boolean 541krb5_principal_compare(krb5_context con, krb5_const_principal princ1, 542 krb5_const_principal princ2) 543 { 544 if (!krb5_loaded) 545 load_krb5_dll(); 546 547 if ( p_krb5_principal_compare ) 548 return(p_krb5_principal_compare(con,princ1,princ2)); 549 else 550 return KRB5KRB_ERR_GENERIC; 551 } 552 553krb5_error_code 554krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys, 555 krb5_ticket *ticket) 556 { 557 if (!krb5_loaded) 558 load_krb5_dll(); 559 560 if ( p_krb5_decrypt_tkt_part ) 561 return(p_krb5_decrypt_tkt_part(con,keys,ticket)); 562 else 563 return KRB5KRB_ERR_GENERIC; 564 } 565 566krb5_error_code 567krb5_timeofday(krb5_context con, krb5_int32 *timeret) 568 { 569 if (!krb5_loaded) 570 load_krb5_dll(); 571 572 if ( p_krb5_timeofday ) 573 return(p_krb5_timeofday(con,timeret)); 574 else 575 return KRB5KRB_ERR_GENERIC; 576 } 577 578krb5_error_code 579krb5_rc_default(krb5_context con, krb5_rcache *rc) 580 { 581 if (!krb5_loaded) 582 load_krb5_dll(); 583 584 if ( p_krb5_rc_default ) 585 return(p_krb5_rc_default(con,rc)); 586 else 587 return KRB5KRB_ERR_GENERIC; 588 } 589 590krb5_error_code 591krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan) 592 { 593 if (!krb5_loaded) 594 load_krb5_dll(); 595 596 if ( p_krb5_rc_initialize ) 597 return(p_krb5_rc_initialize(con, rc, lifespan)); 598 else 599 return KRB5KRB_ERR_GENERIC; 600 } 601 602krb5_error_code 603krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp) 604 { 605 if (!krb5_loaded) 606 load_krb5_dll(); 607 608 if ( p_krb5_rc_get_lifespan ) 609 return(p_krb5_rc_get_lifespan(con, rc, lifespanp)); 610 else 611 return KRB5KRB_ERR_GENERIC; 612 } 613 614krb5_error_code 615krb5_rc_destroy(krb5_context con, krb5_rcache rc) 616 { 617 if (!krb5_loaded) 618 load_krb5_dll(); 619 620 if ( p_krb5_rc_destroy ) 621 return(p_krb5_rc_destroy(con, rc)); 622 else 623 return KRB5KRB_ERR_GENERIC; 624 } 625 626size_t 627krb5_checksum_size(krb5_context context,krb5_cksumtype ctype) 628 { 629 if (!krb5_loaded) 630 load_krb5_dll(); 631 632 if ( p_krb5_checksum_size ) 633 return(p_krb5_checksum_size(context, ctype)); 634 else 635 return KRB5KRB_ERR_GENERIC; 636 } 637 638krb5_boolean 639valid_cksumtype(krb5_cksumtype ctype) 640 { 641 if (!krb5_loaded) 642 load_krb5_dll(); 643 644 if ( p_valid_cksumtype ) 645 return(p_valid_cksumtype(ctype)); 646 else 647 return KRB5KRB_ERR_GENERIC; 648 } 649 650krb5_error_code 651krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry) 652 { 653 if (!krb5_loaded) 654 load_krb5_dll(); 655 656 if ( p_krb5_kt_free_entry ) 657 return(p_krb5_kt_free_entry(con,entry)); 658 else 659 return KRB5KRB_ERR_GENERIC; 660 } 661 662/* Structure definitions */ 663#ifndef NO_DEF_KRB5_CCACHE 664#ifndef krb5_x 665#define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1)) 666#define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0)) 667#endif 668 669typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */ 670 671typedef struct _krb5_ccache 672 { 673 krb5_magic magic; 674 struct _krb5_cc_ops FAR *ops; 675 krb5_pointer data; 676 } *krb5_ccache; 677 678typedef struct _krb5_cc_ops 679 { 680 krb5_magic magic; 681 char *prefix; 682 char * (KRB5_CALLCONV *get_name) 683 (krb5_context, krb5_ccache); 684 krb5_error_code (KRB5_CALLCONV *resolve) 685 (krb5_context, krb5_ccache *, const char *); 686 krb5_error_code (KRB5_CALLCONV *gen_new) 687 (krb5_context, krb5_ccache *); 688 krb5_error_code (KRB5_CALLCONV *init) 689 (krb5_context, krb5_ccache, krb5_principal); 690 krb5_error_code (KRB5_CALLCONV *destroy) 691 (krb5_context, krb5_ccache); 692 krb5_error_code (KRB5_CALLCONV *close) 693 (krb5_context, krb5_ccache); 694 krb5_error_code (KRB5_CALLCONV *store) 695 (krb5_context, krb5_ccache, krb5_creds *); 696 krb5_error_code (KRB5_CALLCONV *retrieve) 697 (krb5_context, krb5_ccache, 698 krb5_flags, krb5_creds *, krb5_creds *); 699 krb5_error_code (KRB5_CALLCONV *get_princ) 700 (krb5_context, krb5_ccache, krb5_principal *); 701 krb5_error_code (KRB5_CALLCONV *get_first) 702 (krb5_context, krb5_ccache, krb5_cc_cursor *); 703 krb5_error_code (KRB5_CALLCONV *get_next) 704 (krb5_context, krb5_ccache, 705 krb5_cc_cursor *, krb5_creds *); 706 krb5_error_code (KRB5_CALLCONV *end_get) 707 (krb5_context, krb5_ccache, krb5_cc_cursor *); 708 krb5_error_code (KRB5_CALLCONV *remove_cred) 709 (krb5_context, krb5_ccache, 710 krb5_flags, krb5_creds *); 711 krb5_error_code (KRB5_CALLCONV *set_flags) 712 (krb5_context, krb5_ccache, krb5_flags); 713 } krb5_cc_ops; 714#endif /* NO_DEF_KRB5_CCACHE */ 715 716krb5_error_code 717kssl_krb5_cc_get_principal 718 (krb5_context context, krb5_ccache cache, 719 krb5_principal *principal) 720 { 721 if ( p_krb5_cc_get_principal ) 722 return(p_krb5_cc_get_principal(context,cache,principal)); 723 else 724 return(krb5_x 725 ((cache)->ops->get_princ,(context, cache, principal))); 726 } 727 728krb5_error_code 729kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon, 730 krb5_rcache rcache) 731 { 732 if ( p_krb5_auth_con_setrcache ) 733 return(p_krb5_auth_con_setrcache(con,acon,rcache)); 734 else 735 return KRB5KRB_ERR_GENERIC; 736 } 737 738krb5_error_code 739kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data, 740 krb5_rcache * rcache) 741 { 742 if ( p_krb5_get_server_rcache ) 743 return(p_krb5_get_server_rcache(con,data,rcache)); 744 else 745 return KRB5KRB_ERR_GENERIC; 746 } 747 748krb5_error_code 749kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon, 750 krb5_rcache * prcache) 751 { 752 if ( p_krb5_auth_con_getrcache ) 753 return(p_krb5_auth_con_getrcache(con,acon, prcache)); 754 else 755 return KRB5KRB_ERR_GENERIC; 756 } 757 758krb5_error_code 759kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab) 760 { 761 if ( p_krb5_kt_close ) 762 return(p_krb5_kt_close(context,keytab)); 763 else 764 return KRB5KRB_ERR_GENERIC; 765 } 766 767krb5_error_code 768kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab, 769 krb5_const_principal principal, krb5_kvno vno, 770 krb5_enctype enctype, krb5_keytab_entry *entry) 771 { 772 if ( p_krb5_kt_get_entry ) 773 return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry)); 774 else 775 return KRB5KRB_ERR_GENERIC; 776 } 777#endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */ 778 779char 780*kstring(char *string) 781 { 782 static char *null = "[NULL]"; 783 784 return ((string == NULL)? null: string); 785 } 786 787/* Given KRB5 enctype (basically DES or 3DES), 788** return closest match openssl EVP_ encryption algorithm. 789** Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes. 790** Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK. 791*/ 792const EVP_CIPHER * 793kssl_map_enc(krb5_enctype enctype) 794 { 795 switch (enctype) 796 { 797 case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */ 798 case ENCTYPE_DES_CBC_CRC: 799 case ENCTYPE_DES_CBC_MD4: 800 case ENCTYPE_DES_CBC_MD5: 801 case ENCTYPE_DES_CBC_RAW: 802 return EVP_des_cbc(); 803 break; 804 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 805 case ENCTYPE_DES3_CBC_SHA: 806 case ENCTYPE_DES3_CBC_RAW: 807 return EVP_des_ede3_cbc(); 808 break; 809 default: return NULL; 810 break; 811 } 812 } 813 814 815/* Return true:1 if p "looks like" the start of the real authenticator 816** described in kssl_skip_confound() below. The ASN.1 pattern is 817** "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and 818** xx and yy are possibly multi-byte length fields. 819*/ 820int kssl_test_confound(unsigned char *p) 821 { 822 int len = 2; 823 int xx = 0, yy = 0; 824 825 if (*p++ != 0x62) return 0; 826 if (*p > 0x82) return 0; 827 switch(*p) { 828 case 0x82: p++; xx = (*p++ << 8); xx += *p++; break; 829 case 0x81: p++; xx = *p++; break; 830 case 0x80: return 0; 831 default: xx = *p++; break; 832 } 833 if (*p++ != 0x30) return 0; 834 if (*p > 0x82) return 0; 835 switch(*p) { 836 case 0x82: p++; len+=2; yy = (*p++ << 8); yy += *p++; break; 837 case 0x81: p++; len++; yy = *p++; break; 838 case 0x80: return 0; 839 default: yy = *p++; break; 840 } 841 842 return (xx - len == yy)? 1: 0; 843 } 844 845/* Allocate, fill, and return cksumlens array of checksum lengths. 846** This array holds just the unique elements from the krb5_cksumarray[]. 847** array[n] == 0 signals end of data. 848** 849** The krb5_cksumarray[] was an internal variable that has since been 850** replaced by a more general method for storing the data. It should 851** not be used. Instead we use real API calls and make a guess for 852** what the highest assigned CKSUMTYPE_ constant is. As of 1.2.2 853** it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3). So we will use 0x0010. 854*/ 855size_t *populate_cksumlens(void) 856 { 857 int i, j, n; 858 static size_t *cklens = NULL; 859 860#ifdef KRB5_MIT_OLD11 861 n = krb5_max_cksum; 862#else 863 n = 0x0010; 864#endif /* KRB5_MIT_OLD11 */ 865 866#ifdef KRB5CHECKAUTH 867 if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1))) return NULL; 868 869 for (i=0; i < n; i++) { 870 if (!valid_cksumtype(i)) continue; /* array has holes */ 871 for (j=0; j < n; j++) { 872 if (cklens[j] == 0) { 873 cklens[j] = krb5_checksum_size(NULL,i); 874 break; /* krb5 elem was new: add */ 875 } 876 if (cklens[j] == krb5_checksum_size(NULL,i)) { 877 break; /* ignore duplicate elements */ 878 } 879 } 880 } 881#endif /* KRB5CHECKAUTH */ 882 883 return cklens; 884 } 885 886/* Return pointer to start of real authenticator within authenticator, or 887** return NULL on error. 888** Decrypted authenticator looks like this: 889** [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r] 890** This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the 891** krb5_auth_con_getcksumtype() function advertised in its krb5.h. 892*/ 893unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a) 894 { 895 int i, conlen; 896 size_t cklen; 897 static size_t *cksumlens = NULL; 898 unsigned char *test_auth; 899 900 conlen = (etype)? 8: 0; 901 902 if (!cksumlens && !(cksumlens = populate_cksumlens())) return NULL; 903 for (i=0; (cklen = cksumlens[i]) != 0; i++) 904 { 905 test_auth = a + conlen + cklen; 906 if (kssl_test_confound(test_auth)) return test_auth; 907 } 908 909 return NULL; 910 } 911 912 913/* Set kssl_err error info when reason text is a simple string 914** kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; } 915*/ 916void 917kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text) 918 { 919 if (kssl_err == NULL) return; 920 921 kssl_err->reason = reason; 922 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text); 923 return; 924 } 925 926 927/* Display contents of krb5_data struct, for debugging 928*/ 929void 930print_krb5_data(char *label, krb5_data *kdata) 931 { 932 int i; 933 934 printf("%s[%d] ", label, kdata->length); 935 for (i=0; i < kdata->length; i++) 936 { 937 if (0 && isprint((int) kdata->data[i])) 938 printf( "%c ", kdata->data[i]); 939 else 940 printf( "%02x ", (unsigned char) kdata->data[i]); 941 } 942 printf("\n"); 943 } 944 945 946/* Display contents of krb5_authdata struct, for debugging 947*/ 948void 949print_krb5_authdata(char *label, krb5_authdata **adata) 950 { 951 if (adata == NULL) 952 { 953 printf("%s, authdata==0\n", label); 954 return; 955 } 956 printf("%s [%p]\n", label, adata); 957#if 0 958 { 959 int i; 960 printf("%s[at%d:%d] ", label, adata->ad_type, adata->length); 961 for (i=0; i < adata->length; i++) 962 { 963 printf((isprint(adata->contents[i]))? "%c ": "%02x", 964 adata->contents[i]); 965 } 966 printf("\n"); 967 } 968#endif 969 } 970 971 972/* Display contents of krb5_keyblock struct, for debugging 973*/ 974void 975print_krb5_keyblock(char *label, krb5_keyblock *keyblk) 976 { 977 int i; 978 979 if (keyblk == NULL) 980 { 981 printf("%s, keyblk==0\n", label); 982 return; 983 } 984#ifdef KRB5_HEIMDAL 985 printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype, 986 keyblk->keyvalue->length); 987 for (i=0; i < keyblk->keyvalue->length; i++) 988 { 989 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]); 990 } 991 printf("\n"); 992#else 993 printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length); 994 for (i=0; i < keyblk->length; i++) 995 { 996 printf("%02x",keyblk->contents[i]); 997 } 998 printf("\n"); 999#endif 1000 } 1001 1002 1003/* Display contents of krb5_principal_data struct, for debugging 1004** (krb5_principal is typedef'd == krb5_principal_data *) 1005*/ 1006void 1007print_krb5_princ(char *label, krb5_principal_data *princ) 1008 { 1009 int i, ui, uj; 1010 1011 printf("%s principal Realm: ", label); 1012 if (princ == NULL) return; 1013 for (ui=0; ui < princ->realm.length; ui++) putchar(princ->realm.data[ui]); 1014 printf(" (nametype %d) has %d strings:\n", princ->type,princ->length); 1015 for (i=0; i < princ->length; i++) 1016 { 1017 printf("\t%d [%d]: ", i, princ->data[i].length); 1018 for (uj=0; uj < princ->data[i].length; uj++) { 1019 putchar(princ->data[i].data[uj]); 1020 } 1021 printf("\n"); 1022 } 1023 return; 1024 } 1025 1026 1027/* Given krb5 service (typically "kssl") and hostname in kssl_ctx, 1028** Return encrypted Kerberos ticket for service @ hostname. 1029** If authenp is non-NULL, also return encrypted authenticator, 1030** whose data should be freed by caller. 1031** (Originally was: Create Kerberos AP_REQ message for SSL Client.) 1032** 1033** 19990628 VRS Started; Returns Kerberos AP_REQ message. 1034** 20010409 VRS Modified for RFC2712; Returns enc tkt. 1035** 20010606 VRS May also return optional authenticator. 1036*/ 1037krb5_error_code 1038kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1039 /* OUT */ krb5_data **enc_ticketp, 1040 /* UPDATE */ krb5_data *authenp, 1041 /* OUT */ KSSL_ERR *kssl_err) 1042 { 1043 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1044 krb5_context krb5context = NULL; 1045 krb5_auth_context krb5auth_context = NULL; 1046 krb5_ccache krb5ccdef = NULL; 1047 krb5_creds krb5creds, *krb5credsp = NULL; 1048 krb5_data krb5_app_req; 1049 1050 kssl_err_set(kssl_err, 0, ""); 1051 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1052 1053 if (!kssl_ctx) 1054 { 1055 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1056 "No kssl_ctx defined.\n"); 1057 goto err; 1058 } 1059 else if (!kssl_ctx->service_host) 1060 { 1061 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1062 "kssl_ctx service_host undefined.\n"); 1063 goto err; 1064 } 1065 1066 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1067 { 1068 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, 1069 "krb5_init_context() fails: %d\n", krb5rc); 1070 kssl_err->reason = SSL_R_KRB5_C_INIT; 1071 goto err; 1072 } 1073 1074 if ((krb5rc = krb5_sname_to_principal(krb5context, 1075 kssl_ctx->service_host, 1076 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1077 KRB5_NT_SRV_HST, &krb5creds.server)) != 0) 1078 { 1079 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, 1080 "krb5_sname_to_principal() fails for %s/%s\n", 1081 kssl_ctx->service_host, 1082 (kssl_ctx->service_name)? kssl_ctx->service_name: 1083 KRB5SVC); 1084 kssl_err->reason = SSL_R_KRB5_C_INIT; 1085 goto err; 1086 } 1087 1088 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1089 { 1090 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1091 "krb5_cc_default fails.\n"); 1092 goto err; 1093 } 1094 1095 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1096 &krb5creds.client)) != 0) 1097 { 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 { 1106 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED, 1107 "krb5_get_credentials() fails.\n"); 1108 goto err; 1109 } 1110 1111 *enc_ticketp = &krb5credsp->ticket; 1112#ifdef KRB5_HEIMDAL 1113 kssl_ctx->enctype = krb5credsp->session.keytype; 1114#else 1115 kssl_ctx->enctype = krb5credsp->keyblock.enctype; 1116#endif 1117 1118 krb5rc = KRB5KRB_ERR_GENERIC; 1119 /* caller should free data of krb5_app_req */ 1120 /* 20010406 VRS deleted for real KerberosWrapper 1121 ** 20010605 VRS reinstated to offer Authenticator to KerberosWrapper 1122 */ 1123 krb5_app_req.length = 0; 1124 if (authenp) 1125 { 1126 krb5_data krb5in_data; 1127 unsigned char *p; 1128 long arlen; 1129 KRB5_APREQBODY *ap_req; 1130 1131 authenp->length = 0; 1132 krb5in_data.data = NULL; 1133 krb5in_data.length = 0; 1134 if ((krb5rc = krb5_mk_req_extended(krb5context, 1135 &krb5auth_context, 0, &krb5in_data, krb5credsp, 1136 &krb5_app_req)) != 0) 1137 { 1138 kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ, 1139 "krb5_mk_req_extended() fails.\n"); 1140 goto err; 1141 } 1142 1143 arlen = krb5_app_req.length; 1144 p = (unsigned char *)krb5_app_req.data; 1145 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen); 1146 if (ap_req) 1147 { 1148 authenp->length = i2d_KRB5_ENCDATA( 1149 ap_req->authenticator, NULL); 1150 if (authenp->length && 1151 (authenp->data = malloc(authenp->length))) 1152 { 1153 unsigned char *adp = (unsigned char *)authenp->data; 1154 authenp->length = i2d_KRB5_ENCDATA( 1155 ap_req->authenticator, &adp); 1156 } 1157 } 1158 1159 if (ap_req) KRB5_APREQ_free((KRB5_APREQ *) ap_req); 1160 if (krb5_app_req.length) 1161 kssl_krb5_free_data_contents(krb5context,&krb5_app_req); 1162 } 1163#ifdef KRB5_HEIMDAL 1164 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session)) 1165 { 1166 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1167 "kssl_ctx_setkey() fails.\n"); 1168 } 1169#else 1170 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock)) 1171 { 1172 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1173 "kssl_ctx_setkey() fails.\n"); 1174 } 1175#endif 1176 else krb5rc = 0; 1177 1178 err: 1179#ifdef KSSL_DEBUG 1180 kssl_ctx_show(kssl_ctx); 1181#endif /* KSSL_DEBUG */ 1182 1183 if (krb5creds.client) krb5_free_principal(krb5context, 1184 krb5creds.client); 1185 if (krb5creds.server) krb5_free_principal(krb5context, 1186 krb5creds.server); 1187 if (krb5auth_context) krb5_auth_con_free(krb5context, 1188 krb5auth_context); 1189 if (krb5context) krb5_free_context(krb5context); 1190 return (krb5rc); 1191 } 1192 1193 1194/* Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket. 1195** Return Kerberos error code and kssl_err struct on error. 1196** Allocates krb5_ticket and krb5_principal; caller should free these. 1197** 1198** 20010410 VRS Implemented krb5_decode_ticket() as 1199** old_krb5_decode_ticket(). Missing from MIT1.0.6. 1200** 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions. 1201** Re-used some of the old krb5_decode_ticket() 1202** code here. This tkt should alloc/free just 1203** like the real thing. 1204*/ 1205krb5_error_code 1206kssl_TKT2tkt( /* IN */ krb5_context krb5context, 1207 /* IN */ KRB5_TKTBODY *asn1ticket, 1208 /* OUT */ krb5_ticket **krb5ticket, 1209 /* OUT */ 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 { 1221 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1222 "Null field in asn1ticket.\n"); 1223 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1224 return KRB5KRB_ERR_GENERIC; 1225 } 1226 1227 if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL) 1228 { 1229 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1230 "Unable to allocate new krb5_ticket.\n"); 1231 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1232 return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */ 1233 } 1234 1235 gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0); 1236 gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1); 1237 1238 if ((krb5rc = kssl_build_principal_2(krb5context, 1239 &new5ticket->server, 1240 asn1ticket->realm->length, (char *)asn1ticket->realm->data, 1241 gstr_svc->length, (char *)gstr_svc->data, 1242 gstr_host->length, (char *)gstr_host->data)) != 0) 1243 { 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 { 1260 free(new5ticket); 1261 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1262 "Error allocating cipher in krb5ticket.\n"); 1263 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1264 return KRB5KRB_ERR_GENERIC; 1265 } 1266 else 1267 { 1268 memcpy(new5ticket->enc_part.ciphertext.data, 1269 asn1ticket->encdata->cipher->data, 1270 asn1ticket->encdata->cipher->length); 1271 } 1272 1273 *krb5ticket = new5ticket; 1274 return 0; 1275 } 1276 1277 1278/* Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"), 1279** and krb5 AP_REQ message & message length, 1280** Return Kerberos session key and client principle 1281** to SSL Server in KSSL_CTX *kssl_ctx. 1282** 1283** 19990702 VRS Started. 1284*/ 1285krb5_error_code 1286kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1287 /* IN */ krb5_data *indata, 1288 /* OUT */ krb5_ticket_times *ttimes, 1289 /* OUT */ KSSL_ERR *kssl_err ) 1290 { 1291 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1292 static krb5_context krb5context = NULL; 1293 static krb5_auth_context krb5auth_context = NULL; 1294 krb5_ticket *krb5ticket = NULL; 1295 KRB5_TKTBODY *asn1ticket = NULL; 1296 unsigned char *p; 1297 krb5_keytab krb5keytab = NULL; 1298 krb5_keytab_entry kt_entry; 1299 krb5_principal krb5server; 1300 krb5_rcache rcache = NULL; 1301 1302 kssl_err_set(kssl_err, 0, ""); 1303 1304 if (!kssl_ctx) 1305 { 1306 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1307 "No kssl_ctx defined.\n"); 1308 goto err; 1309 } 1310 1311#ifdef KSSL_DEBUG 1312 printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name)); 1313#endif /* KSSL_DEBUG */ 1314 1315 if (!krb5context && (krb5rc = krb5_init_context(&krb5context))) 1316 { 1317 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1318 "krb5_init_context() fails.\n"); 1319 goto err; 1320 } 1321 if (krb5auth_context && 1322 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context))) 1323 { 1324 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1325 "krb5_auth_con_free() fails.\n"); 1326 goto err; 1327 } 1328 else krb5auth_context = NULL; 1329 if (!krb5auth_context && 1330 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context))) 1331 { 1332 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1333 "krb5_auth_con_init() fails.\n"); 1334 goto err; 1335 } 1336 1337 1338 if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context, 1339 &rcache))) 1340 { 1341 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1342 "krb5_auth_con_getrcache() fails.\n"); 1343 goto err; 1344 } 1345 1346 if ((krb5rc = krb5_sname_to_principal(krb5context, NULL, 1347 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1348 KRB5_NT_SRV_HST, &krb5server)) != 0) 1349 { 1350 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1351 "krb5_sname_to_principal() fails.\n"); 1352 goto err; 1353 } 1354 1355 if (rcache == NULL) 1356 { 1357 if ((krb5rc = krb5_get_server_rcache(krb5context, 1358 krb5_princ_component(krb5context, krb5server, 0), 1359 &rcache))) 1360 { 1361 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1362 "krb5_get_server_rcache() fails.\n"); 1363 goto err; 1364 } 1365 } 1366 1367 if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache))) 1368 { 1369 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1370 "krb5_auth_con_setrcache() fails.\n"); 1371 goto err; 1372 } 1373 1374 1375 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default 1376 */ 1377 if (kssl_ctx->keytab_file) 1378 { 1379 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1380 &krb5keytab); 1381 if (krb5rc) 1382 { 1383 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1384 "krb5_kt_resolve() fails.\n"); 1385 goto err; 1386 } 1387 } 1388 else 1389 { 1390 krb5rc = krb5_kt_default(krb5context,&krb5keytab); 1391 if (krb5rc) 1392 { 1393 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1394 "krb5_kt_default() fails.\n"); 1395 goto err; 1396 } 1397 } 1398 1399 /* Actual Kerberos5 krb5_recvauth() has initial conversation here 1400 ** o check KRB5_SENDAUTH_BADAUTHVERS 1401 ** unless KRB5_RECVAUTH_SKIP_VERSION 1402 ** o check KRB5_SENDAUTH_BADAPPLVERS 1403 ** o send "0" msg if all OK 1404 */ 1405 1406 /* 20010411 was using AP_REQ instead of true KerberosWrapper 1407 ** 1408 ** if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context, 1409 ** &krb5in_data, krb5server, krb5keytab, 1410 ** &ap_option, &krb5ticket)) != 0) { Error } 1411 */ 1412 1413 p = (unsigned char *)indata->data; 1414 if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p, 1415 (long) indata->length)) == NULL) 1416 { 1417 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1418 "d2i_KRB5_TICKET() ASN.1 decode failure.\n"); 1419 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1420 goto err; 1421 } 1422 1423 /* Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */ 1424 if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket, 1425 kssl_err)) != 0) 1426 { 1427 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1428 "Error converting ASN.1 ticket to krb5_ticket.\n"); 1429 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1430 goto err; 1431 } 1432 1433 if (! krb5_principal_compare(krb5context, krb5server, 1434 krb5ticket->server)) { 1435 krb5rc = KRB5_PRINC_NOMATCH; 1436 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1437 "server principal != ticket principal\n"); 1438 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1439 goto err; 1440 } 1441 if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1442 krb5ticket->server, krb5ticket->enc_part.kvno, 1443 krb5ticket->enc_part.enctype, &kt_entry)) != 0) { 1444 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1445 "krb5_kt_get_entry() fails with %x.\n", krb5rc); 1446 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1447 goto err; 1448 } 1449 if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key, 1450 krb5ticket)) != 0) { 1451 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1452 "krb5_decrypt_tkt_part() failed.\n"); 1453 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1454 goto err; 1455 } 1456 else { 1457 krb5_kt_free_entry(krb5context, &kt_entry); 1458#ifdef KSSL_DEBUG 1459 { 1460 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs; 1461 printf("Decrypted ticket fields:\n"); 1462 printf("\tflags: %X, transit-type: %X", 1463 krb5ticket->enc_part2->flags, 1464 krb5ticket->enc_part2->transited.tr_type); 1465 print_krb5_data("\ttransit-data: ", 1466 &(krb5ticket->enc_part2->transited.tr_contents)); 1467 printf("\tcaddrs: %p, authdata: %p\n", 1468 krb5ticket->enc_part2->caddrs, 1469 krb5ticket->enc_part2->authorization_data); 1470 if (paddr) 1471 { 1472 printf("\tcaddrs:\n"); 1473 for (i=0; paddr[i] != NULL; i++) 1474 { 1475 krb5_data d; 1476 d.length=paddr[i]->length; 1477 d.data=paddr[i]->contents; 1478 print_krb5_data("\t\tIP: ", &d); 1479 } 1480 } 1481 printf("\tstart/auth/end times: %d / %d / %d\n", 1482 krb5ticket->enc_part2->times.starttime, 1483 krb5ticket->enc_part2->times.authtime, 1484 krb5ticket->enc_part2->times.endtime); 1485 } 1486#endif /* KSSL_DEBUG */ 1487 } 1488 1489 krb5rc = KRB5_NO_TKT_SUPPLIED; 1490 if (!krb5ticket || !krb5ticket->enc_part2 || 1491 !krb5ticket->enc_part2->client || 1492 !krb5ticket->enc_part2->client->data || 1493 !krb5ticket->enc_part2->session) 1494 { 1495 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1496 "bad ticket from krb5_rd_req.\n"); 1497 } 1498 else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT, 1499 &krb5ticket->enc_part2->client->realm, 1500 krb5ticket->enc_part2->client->data, 1501 krb5ticket->enc_part2->client->length)) 1502 { 1503 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1504 "kssl_ctx_setprinc() fails.\n"); 1505 } 1506 else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session)) 1507 { 1508 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1509 "kssl_ctx_setkey() fails.\n"); 1510 } 1511 else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID) 1512 { 1513 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID; 1514 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1515 "invalid ticket from krb5_rd_req.\n"); 1516 } 1517 else krb5rc = 0; 1518 1519 kssl_ctx->enctype = krb5ticket->enc_part.enctype; 1520 ttimes->authtime = krb5ticket->enc_part2->times.authtime; 1521 ttimes->starttime = krb5ticket->enc_part2->times.starttime; 1522 ttimes->endtime = krb5ticket->enc_part2->times.endtime; 1523 ttimes->renew_till = krb5ticket->enc_part2->times.renew_till; 1524 1525 err: 1526#ifdef KSSL_DEBUG 1527 kssl_ctx_show(kssl_ctx); 1528#endif /* KSSL_DEBUG */ 1529 1530 if (asn1ticket) KRB5_TICKET_free((KRB5_TICKET *) asn1ticket); 1531 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab); 1532 if (krb5ticket) krb5_free_ticket(krb5context, krb5ticket); 1533 if (krb5server) krb5_free_principal(krb5context, krb5server); 1534 return (krb5rc); 1535 } 1536 1537 1538/* Allocate & return a new kssl_ctx struct. 1539*/ 1540KSSL_CTX * 1541kssl_ctx_new(void) 1542 { 1543 return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX))); 1544 } 1545 1546 1547/* Frees a kssl_ctx struct and any allocated memory it holds. 1548** Returns NULL. 1549*/ 1550KSSL_CTX * 1551kssl_ctx_free(KSSL_CTX *kssl_ctx) 1552 { 1553 if (kssl_ctx == NULL) return kssl_ctx; 1554 1555 if (kssl_ctx->key) OPENSSL_cleanse(kssl_ctx->key, 1556 kssl_ctx->length); 1557 if (kssl_ctx->key) free(kssl_ctx->key); 1558 if (kssl_ctx->client_princ) free(kssl_ctx->client_princ); 1559 if (kssl_ctx->service_host) free(kssl_ctx->service_host); 1560 if (kssl_ctx->service_name) free(kssl_ctx->service_name); 1561 if (kssl_ctx->keytab_file) free(kssl_ctx->keytab_file); 1562 1563 free(kssl_ctx); 1564 return (KSSL_CTX *) NULL; 1565 } 1566 1567 1568/* Given an array of (krb5_data *) entity (and optional realm), 1569** set the plain (char *) client_princ or service_host member 1570** of the kssl_ctx struct. 1571*/ 1572krb5_error_code 1573kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which, 1574 krb5_data *realm, krb5_data *entity, int nentities) 1575 { 1576 char **princ; 1577 int length; 1578 int i; 1579 1580 if (kssl_ctx == NULL || entity == NULL) return KSSL_CTX_ERR; 1581 1582 switch (which) 1583 { 1584 case KSSL_CLIENT: princ = &kssl_ctx->client_princ; break; 1585 case KSSL_SERVER: princ = &kssl_ctx->service_host; break; 1586 default: return KSSL_CTX_ERR; break; 1587 } 1588 if (*princ) free(*princ); 1589 1590 /* Add up all the entity->lengths */ 1591 length = 0; 1592 for (i=0; i < nentities; i++) 1593 { 1594 length += entity[i].length; 1595 } 1596 /* Add in space for the '/' character(s) (if any) */ 1597 length += nentities-1; 1598 /* Space for the ('@'+realm+NULL | NULL) */ 1599 length += ((realm)? realm->length + 2: 1); 1600 1601 if ((*princ = calloc(1, length)) == NULL) 1602 return KSSL_CTX_ERR; 1603 else 1604 { 1605 for (i = 0; i < nentities; i++) 1606 { 1607 strncat(*princ, entity[i].data, entity[i].length); 1608 if (i < nentities-1) 1609 { 1610 strcat (*princ, "/"); 1611 } 1612 } 1613 if (realm) 1614 { 1615 strcat (*princ, "@"); 1616 (void) strncat(*princ, realm->data, realm->length); 1617 } 1618 } 1619 1620 return KSSL_CTX_OK; 1621 } 1622 1623 1624/* Set one of the plain (char *) string members of the kssl_ctx struct. 1625** Default values should be: 1626** which == KSSL_SERVICE => "khost" (KRB5SVC) 1627** which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB) 1628*/ 1629krb5_error_code 1630kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text) 1631 { 1632 char **string; 1633 1634 if (!kssl_ctx) return KSSL_CTX_ERR; 1635 1636 switch (which) 1637 { 1638 case KSSL_SERVICE: string = &kssl_ctx->service_name; break; 1639 case KSSL_SERVER: string = &kssl_ctx->service_host; break; 1640 case KSSL_CLIENT: string = &kssl_ctx->client_princ; break; 1641 case KSSL_KEYTAB: string = &kssl_ctx->keytab_file; break; 1642 default: return KSSL_CTX_ERR; break; 1643 } 1644 if (*string) free(*string); 1645 1646 if (!text) 1647 { 1648 *string = '\0'; 1649 return KSSL_CTX_OK; 1650 } 1651 1652 if ((*string = 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 1665kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session) 1666 { 1667 int length; 1668 krb5_enctype enctype; 1669 krb5_octet FAR *contents = NULL; 1670 1671 if (!kssl_ctx) return KSSL_CTX_ERR; 1672 1673 if (kssl_ctx->key) 1674 { 1675 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length); 1676 free(kssl_ctx->key); 1677 } 1678 1679 if (session) 1680 { 1681 1682#ifdef KRB5_HEIMDAL 1683 length = session->keyvalue->length; 1684 enctype = session->keytype; 1685 contents = session->keyvalue->contents; 1686#else 1687 length = session->length; 1688 enctype = session->enctype; 1689 contents = session->contents; 1690#endif 1691 kssl_ctx->enctype = enctype; 1692 kssl_ctx->length = length; 1693 } 1694 else 1695 { 1696 kssl_ctx->enctype = ENCTYPE_UNKNOWN; 1697 kssl_ctx->length = 0; 1698 return KSSL_CTX_OK; 1699 } 1700 1701 if ((kssl_ctx->key = 1702 (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL) 1703 { 1704 kssl_ctx->length = 0; 1705 return KSSL_CTX_ERR; 1706 } 1707 else 1708 memcpy(kssl_ctx->key, contents, length); 1709 1710 return KSSL_CTX_OK; 1711 } 1712 1713 1714/* Display contents of kssl_ctx struct 1715*/ 1716void 1717kssl_ctx_show(KSSL_CTX *kssl_ctx) 1718 { 1719 int i; 1720 1721 printf("kssl_ctx: "); 1722 if (kssl_ctx == NULL) 1723 { 1724 printf("NULL\n"); 1725 return; 1726 } 1727 else 1728 printf("%p\n", kssl_ctx); 1729 1730 printf("\tservice:\t%s\n", 1731 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL"); 1732 printf("\tclient:\t%s\n", 1733 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL"); 1734 printf("\tserver:\t%s\n", 1735 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL"); 1736 printf("\tkeytab:\t%s\n", 1737 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL"); 1738 printf("\tkey [%d:%d]:\t", 1739 kssl_ctx->enctype, kssl_ctx->length); 1740 1741 for (i=0; i < kssl_ctx->length && kssl_ctx->key; i++) 1742 { 1743 printf("%02x", kssl_ctx->key[i]); 1744 } 1745 printf("\n"); 1746 return; 1747 } 1748 1749 int 1750 kssl_keytab_is_available(KSSL_CTX *kssl_ctx) 1751{ 1752 krb5_context krb5context = NULL; 1753 krb5_keytab krb5keytab = NULL; 1754 krb5_keytab_entry entry; 1755 krb5_principal princ = NULL; 1756 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1757 int rc = 0; 1758 1759 if ((krb5rc = krb5_init_context(&krb5context))) 1760 return(0); 1761 1762 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default 1763 */ 1764 if (kssl_ctx->keytab_file) 1765 { 1766 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1767 &krb5keytab); 1768 if (krb5rc) 1769 goto exit; 1770 } 1771 else 1772 { 1773 krb5rc = krb5_kt_default(krb5context,&krb5keytab); 1774 if (krb5rc) 1775 goto exit; 1776 } 1777 1778 /* the host key we are looking for */ 1779 krb5rc = krb5_sname_to_principal(krb5context, NULL, 1780 kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC, 1781 KRB5_NT_SRV_HST, &princ); 1782 1783 krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1784 princ, 1785 0 /* IGNORE_VNO */, 1786 0 /* IGNORE_ENCTYPE */, 1787 &entry); 1788 if ( krb5rc == KRB5_KT_NOTFOUND ) { 1789 rc = 1; 1790 goto exit; 1791 } else if ( krb5rc ) 1792 goto exit; 1793 1794 krb5_kt_free_entry(krb5context, &entry); 1795 rc = 1; 1796 1797 exit: 1798 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab); 1799 if (princ) krb5_free_principal(krb5context, princ); 1800 if (krb5context) krb5_free_context(krb5context); 1801 return(rc); 1802} 1803 1804int 1805kssl_tgt_is_available(KSSL_CTX *kssl_ctx) 1806 { 1807 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1808 krb5_context krb5context = NULL; 1809 krb5_ccache krb5ccdef = NULL; 1810 krb5_creds krb5creds, *krb5credsp = NULL; 1811 int rc = 0; 1812 1813 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1814 1815 if (!kssl_ctx) 1816 return(0); 1817 1818 if (!kssl_ctx->service_host) 1819 return(0); 1820 1821 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1822 goto err; 1823 1824 if ((krb5rc = krb5_sname_to_principal(krb5context, 1825 kssl_ctx->service_host, 1826 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1827 KRB5_NT_SRV_HST, &krb5creds.server)) != 0) 1828 goto err; 1829 1830 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1831 goto err; 1832 1833 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1834 &krb5creds.client)) != 0) 1835 goto err; 1836 1837 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1838 &krb5creds, &krb5credsp)) != 0) 1839 goto err; 1840 1841 rc = 1; 1842 1843 err: 1844#ifdef KSSL_DEBUG 1845 kssl_ctx_show(kssl_ctx); 1846#endif /* KSSL_DEBUG */ 1847 1848 if (krb5creds.client) krb5_free_principal(krb5context, krb5creds.client); 1849 if (krb5creds.server) krb5_free_principal(krb5context, krb5creds.server); 1850 if (krb5context) krb5_free_context(krb5context); 1851 return(rc); 1852 } 1853 1854#if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32) 1855void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data) 1856 { 1857#ifdef KRB5_HEIMDAL 1858 data->length = 0; 1859 if (data->data) 1860 free(data->data); 1861#elif defined(KRB5_MIT_OLD11) 1862 if (data->data) { 1863 krb5_xfree(data->data); 1864 data->data = 0; 1865 } 1866#else 1867 krb5_free_data_contents(NULL, data); 1868#endif 1869 } 1870#endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */ 1871 1872 1873/* Given pointers to KerberosTime and struct tm structs, convert the 1874** KerberosTime string to struct tm. Note that KerberosTime is a 1875** ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional 1876** seconds as defined in RFC 1510. 1877** Return pointer to the (partially) filled in struct tm on success, 1878** return NULL on failure. 1879*/ 1880struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm) 1881 { 1882 char c, *p; 1883 1884 if (!k_tm) return NULL; 1885 if (gtime == NULL || gtime->length < 14) return NULL; 1886 if (gtime->data == NULL) return NULL; 1887 1888 p = (char *)>ime->data[14]; 1889 1890 c = *p; *p = '\0'; p -= 2; k_tm->tm_sec = atoi(p); *(p+2) = c; 1891 c = *p; *p = '\0'; p -= 2; k_tm->tm_min = atoi(p); *(p+2) = c; 1892 c = *p; *p = '\0'; p -= 2; k_tm->tm_hour = atoi(p); *(p+2) = c; 1893 c = *p; *p = '\0'; p -= 2; k_tm->tm_mday = atoi(p); *(p+2) = c; 1894 c = *p; *p = '\0'; p -= 2; k_tm->tm_mon = atoi(p)-1; *(p+2) = c; 1895 c = *p; *p = '\0'; p -= 4; k_tm->tm_year = atoi(p)-1900; *(p+4) = c; 1896 1897 return k_tm; 1898 } 1899 1900 1901/* Helper function for kssl_validate_times(). 1902** We need context->clockskew, but krb5_context is an opaque struct. 1903** So we try to sneek the clockskew out through the replay cache. 1904** If that fails just return a likely default (300 seconds). 1905*/ 1906krb5_deltat get_rc_clockskew(krb5_context context) 1907 { 1908 krb5_rcache rc; 1909 krb5_deltat clockskew; 1910 1911 if (krb5_rc_default(context, &rc)) return KSSL_CLOCKSKEW; 1912 if (krb5_rc_initialize(context, rc, 0)) return KSSL_CLOCKSKEW; 1913 if (krb5_rc_get_lifespan(context, rc, &clockskew)) { 1914 clockskew = KSSL_CLOCKSKEW; 1915 } 1916 (void) krb5_rc_destroy(context, rc); 1917 return clockskew; 1918 } 1919 1920 1921/* kssl_validate_times() combines (and more importantly exposes) 1922** the MIT KRB5 internal function krb5_validate_times() and the 1923** in_clock_skew() macro. The authenticator client time is checked 1924** to be within clockskew secs of the current time and the current 1925** time is checked to be within the ticket start and expire times. 1926** Either check may be omitted by supplying a NULL value. 1927** Returns 0 for valid times, SSL_R_KRB5* error codes otherwise. 1928** See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c 1929** 20010420 VRS 1930*/ 1931krb5_error_code kssl_validate_times( krb5_timestamp atime, 1932 krb5_ticket_times *ttimes) 1933 { 1934 krb5_deltat skew; 1935 krb5_timestamp start, now; 1936 krb5_error_code rc; 1937 krb5_context context; 1938 1939 if ((rc = krb5_init_context(&context))) return SSL_R_KRB5_S_BAD_TICKET; 1940 skew = get_rc_clockskew(context); 1941 if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET; 1942 krb5_free_context(context); 1943 1944 if (atime && labs(atime - now) >= skew) return SSL_R_KRB5_S_TKT_SKEW; 1945 1946 if (! ttimes) return 0; 1947 1948 start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime; 1949 if (start - now > skew) return SSL_R_KRB5_S_TKT_NYV; 1950 if ((now - ttimes->endtime) > skew) return SSL_R_KRB5_S_TKT_EXPIRED; 1951 1952#ifdef KSSL_DEBUG 1953 printf("kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n", 1954 start, atime, now, skew, ttimes->endtime); 1955#endif /* KSSL_DEBUG */ 1956 1957 return 0; 1958 } 1959 1960 1961/* Decode and decrypt given DER-encoded authenticator, then pass 1962** authenticator ctime back in *atimep (or 0 if time unavailable). 1963** Returns krb5_error_code and kssl_err on error. A NULL 1964** authenticator (authentp->length == 0) is not considered an error. 1965** Note that kssl_check_authent() makes use of the KRB5 session key; 1966** you must call kssl_sget_tkt() to get the key before calling this routine. 1967*/ 1968krb5_error_code kssl_check_authent( 1969 /* IN */ KSSL_CTX *kssl_ctx, 1970 /* IN */ krb5_data *authentp, 1971 /* OUT */ krb5_timestamp *atimep, 1972 /* OUT */ KSSL_ERR *kssl_err ) 1973 { 1974 krb5_error_code krb5rc = 0; 1975 KRB5_ENCDATA *dec_authent = NULL; 1976 KRB5_AUTHENTBODY *auth = NULL; 1977 krb5_enctype enctype; 1978 EVP_CIPHER_CTX ciph_ctx; 1979 const EVP_CIPHER *enc = NULL; 1980 unsigned char iv[EVP_MAX_IV_LENGTH]; 1981 unsigned char *p, *unenc_authent; 1982 int outl, unencbufsize; 1983 struct tm tm_time, *tm_l, *tm_g; 1984 time_t now, tl, tg, tr, tz_offset; 1985 1986 EVP_CIPHER_CTX_init(&ciph_ctx); 1987 *atimep = 0; 1988 kssl_err_set(kssl_err, 0, ""); 1989 1990#ifndef KRB5CHECKAUTH 1991 authentp = NULL; 1992#else 1993#if KRB5CHECKAUTH == 0 1994 authentp = NULL; 1995#endif 1996#endif /* KRB5CHECKAUTH */ 1997 1998 if (authentp == NULL || authentp->length == 0) return 0; 1999 2000#ifdef KSSL_DEBUG 2001 { 2002 unsigned int ui; 2003 printf("kssl_check_authent: authenticator[%d]:\n",authentp->length); 2004 p = authentp->data; 2005 for (ui=0; ui < authentp->length; ui++) printf("%02x ",p[ui]); 2006 printf("\n"); 2007 } 2008#endif /* KSSL_DEBUG */ 2009 2010 unencbufsize = 2 * authentp->length; 2011 if ((unenc_authent = calloc(1, unencbufsize)) == NULL) 2012 { 2013 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2014 "Unable to allocate authenticator buffer.\n"); 2015 krb5rc = KRB5KRB_ERR_GENERIC; 2016 goto err; 2017 } 2018 2019 p = (unsigned char *)authentp->data; 2020 if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p, 2021 (long) authentp->length)) == NULL) 2022 { 2023 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2024 "Error decoding authenticator.\n"); 2025 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2026 goto err; 2027 } 2028 2029 enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */ 2030#if !defined(KRB5_MIT_OLD11) 2031 switch ( enctype ) { 2032 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 2033 case ENCTYPE_DES3_CBC_SHA: 2034 case ENCTYPE_DES3_CBC_RAW: 2035 krb5rc = 0; /* Skip, can't handle derived keys */ 2036 goto err; 2037 } 2038#endif 2039 enc = kssl_map_enc(enctype); 2040 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2041 2042 if (enc == NULL) 2043 { 2044 /* Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1. 2045 ** This enctype indicates the authenticator was encrypted 2046 ** using key-usage derived keys which openssl cannot decrypt. 2047 */ 2048 goto err; 2049 } 2050 2051 if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0)) 2052 { 2053 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2054 "EVP_CipherInit error decrypting authenticator.\n"); 2055 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2056 goto err; 2057 } 2058 outl = dec_authent->cipher->length; 2059 if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl)) 2060 { 2061 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2062 "EVP_Cipher error decrypting authenticator.\n"); 2063 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2064 goto err; 2065 } 2066 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2067 2068#ifdef KSSL_DEBUG 2069 printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl); 2070 for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]); 2071 printf("\n"); 2072#endif /* KSSL_DEBUG */ 2073 2074 if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL) 2075 { 2076 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2077 "confounded by authenticator.\n"); 2078 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2079 goto err; 2080 } 2081 outl -= p - unenc_authent; 2082 2083 if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p, 2084 (long) outl))==NULL) 2085 { 2086 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2087 "Error decoding authenticator body.\n"); 2088 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2089 goto err; 2090 } 2091 2092 memset(&tm_time,0,sizeof(struct tm)); 2093 if (k_gmtime(auth->ctime, &tm_time) && 2094 ((tr = mktime(&tm_time)) != (time_t)(-1))) 2095 { 2096 now = time(&now); 2097 tm_l = localtime(&now); tl = mktime(tm_l); 2098 tm_g = gmtime(&now); tg = mktime(tm_g); 2099 tz_offset = tg - tl; 2100 2101 *atimep = tr - tz_offset; 2102 } 2103 2104#ifdef KSSL_DEBUG 2105 printf("kssl_check_authent: returns %d for client time ", *atimep); 2106 if (auth && auth->ctime && auth->ctime->length && auth->ctime->data) 2107 printf("%.*s\n", auth->ctime->length, auth->ctime->data); 2108 else printf("NULL\n"); 2109#endif /* KSSL_DEBUG */ 2110 2111 err: 2112 if (auth) KRB5_AUTHENT_free((KRB5_AUTHENT *) auth); 2113 if (dec_authent) KRB5_ENCDATA_free(dec_authent); 2114 if (unenc_authent) free(unenc_authent); 2115 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2116 return krb5rc; 2117 } 2118 2119 2120/* Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host), 2121** because I dont't know how to stub varargs. 2122** Returns krb5_error_code == ENOMEM on alloc error, otherwise 2123** passes back newly constructed principal, which should be freed by caller. 2124*/ 2125krb5_error_code kssl_build_principal_2( 2126 /* UPDATE */ krb5_context context, 2127 /* OUT */ krb5_principal *princ, 2128 /* IN */ int rlen, const char *realm, 2129 /* IN */ int slen, const char *svc, 2130 /* IN */ int hlen, const char *host) 2131 { 2132 krb5_data *p_data = NULL; 2133 krb5_principal new_p = NULL; 2134 char *new_r = NULL; 2135 2136 if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL || 2137 (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data))) 2138 == NULL) goto err; 2139 new_p->length = 2; 2140 new_p->data = p_data; 2141 2142 if ((new_r = calloc(1, rlen + 1)) == NULL) goto err; 2143 memcpy(new_r, realm, rlen); 2144 krb5_princ_set_realm_length(context, new_p, rlen); 2145 krb5_princ_set_realm_data(context, new_p, new_r); 2146 2147 if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) goto err; 2148 memcpy(new_p->data[0].data, svc, slen); 2149 new_p->data[0].length = slen; 2150 2151 if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) goto err; 2152 memcpy(new_p->data[1].data, host, hlen); 2153 new_p->data[1].length = hlen; 2154 2155 krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN; 2156 *princ = new_p; 2157 return 0; 2158 2159 err: 2160 if (new_p && new_p[0].data) free(new_p[0].data); 2161 if (new_p && new_p[1].data) free(new_p[1].data); 2162 if (new_p) free(new_p); 2163 if (new_r) free(new_r); 2164 return ENOMEM; 2165 } 2166 2167 2168#else /* !OPENSSL_NO_KRB5 */ 2169 2170#if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS) 2171static int dummy=(int)&dummy; 2172#endif 2173 2174#endif /* !OPENSSL_NO_KRB5 */ 2175 2176