kssl.c revision 160814
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 500 /* glibc2 needs this to declare strptime() */ 72#include <time.h> 73#if 0 /* experimental */ 74#undef _XOPEN_SOURCE /* To avoid clashes with anything else... */ 75#endif 76#include <string.h> 77 78#define KRB5_PRIVATE 1 79 80#include <openssl/ssl.h> 81#include <openssl/evp.h> 82#include <openssl/objects.h> 83#include <openssl/krb5_asn.h> 84 85#ifndef OPENSSL_NO_KRB5 86 87#ifndef ENOMEM 88#define ENOMEM KRB5KRB_ERR_GENERIC 89#endif 90 91/* 92 * When OpenSSL is built on Windows, we do not want to require that 93 * the Kerberos DLLs be available in order for the OpenSSL DLLs to 94 * work. Therefore, all Kerberos routines are loaded at run time 95 * and we do not link to a .LIB file. 96 */ 97 98#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) 99/* 100 * The purpose of the following pre-processor statements is to provide 101 * compatibility with different releases of MIT Kerberos for Windows. 102 * All versions up to 1.2 used macros. But macros do not allow for 103 * a binary compatible interface for DLLs. Therefore, all macros are 104 * being replaced by function calls. The following code will allow 105 * an OpenSSL DLL built on Windows to work whether or not the macro 106 * or function form of the routines are utilized. 107 */ 108#ifdef krb5_cc_get_principal 109#define NO_DEF_KRB5_CCACHE 110#undef krb5_cc_get_principal 111#endif 112#define krb5_cc_get_principal kssl_krb5_cc_get_principal 113 114#define krb5_free_data_contents kssl_krb5_free_data_contents 115#define krb5_free_context kssl_krb5_free_context 116#define krb5_auth_con_free kssl_krb5_auth_con_free 117#define krb5_free_principal kssl_krb5_free_principal 118#define krb5_mk_req_extended kssl_krb5_mk_req_extended 119#define krb5_get_credentials kssl_krb5_get_credentials 120#define krb5_cc_default kssl_krb5_cc_default 121#define krb5_sname_to_principal kssl_krb5_sname_to_principal 122#define krb5_init_context kssl_krb5_init_context 123#define krb5_free_ticket kssl_krb5_free_ticket 124#define krb5_rd_req kssl_krb5_rd_req 125#define krb5_kt_default kssl_krb5_kt_default 126#define krb5_kt_resolve kssl_krb5_kt_resolve 127/* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */ 128#ifndef krb5_kt_close 129#define krb5_kt_close kssl_krb5_kt_close 130#endif /* krb5_kt_close */ 131#ifndef krb5_kt_get_entry 132#define krb5_kt_get_entry kssl_krb5_kt_get_entry 133#endif /* krb5_kt_get_entry */ 134#define krb5_auth_con_init kssl_krb5_auth_con_init 135 136#define krb5_principal_compare kssl_krb5_principal_compare 137#define krb5_decrypt_tkt_part kssl_krb5_decrypt_tkt_part 138#define krb5_timeofday kssl_krb5_timeofday 139#define krb5_rc_default kssl_krb5_rc_default 140 141#ifdef krb5_rc_initialize 142#undef krb5_rc_initialize 143#endif 144#define krb5_rc_initialize kssl_krb5_rc_initialize 145 146#ifdef krb5_rc_get_lifespan 147#undef krb5_rc_get_lifespan 148#endif 149#define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan 150 151#ifdef krb5_rc_destroy 152#undef krb5_rc_destroy 153#endif 154#define krb5_rc_destroy kssl_krb5_rc_destroy 155 156#define valid_cksumtype kssl_valid_cksumtype 157#define krb5_checksum_size kssl_krb5_checksum_size 158#define krb5_kt_free_entry kssl_krb5_kt_free_entry 159#define krb5_auth_con_setrcache kssl_krb5_auth_con_setrcache 160#define krb5_auth_con_getrcache kssl_krb5_auth_con_getrcache 161#define krb5_get_server_rcache kssl_krb5_get_server_rcache 162 163/* Prototypes for built in stubs */ 164void kssl_krb5_free_data_contents(krb5_context, krb5_data *); 165void kssl_krb5_free_principal(krb5_context, krb5_principal ); 166krb5_error_code kssl_krb5_kt_resolve(krb5_context, 167 krb5_const char *, 168 krb5_keytab *); 169krb5_error_code kssl_krb5_kt_default(krb5_context, 170 krb5_keytab *); 171krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *); 172krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, 173 krb5_const krb5_data *, 174 krb5_const_principal, krb5_keytab, 175 krb5_flags *,krb5_ticket **); 176 177krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal, 178 krb5_const_principal); 179krb5_error_code kssl_krb5_mk_req_extended(krb5_context, 180 krb5_auth_context *, 181 krb5_const krb5_flags, 182 krb5_data *, 183 krb5_creds *, 184 krb5_data * ); 185krb5_error_code kssl_krb5_init_context(krb5_context *); 186void kssl_krb5_free_context(krb5_context); 187krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache *); 188krb5_error_code kssl_krb5_sname_to_principal(krb5_context, 189 krb5_const char *, 190 krb5_const char *, 191 krb5_int32, 192 krb5_principal *); 193krb5_error_code kssl_krb5_get_credentials(krb5_context, 194 krb5_const krb5_flags, 195 krb5_ccache, 196 krb5_creds *, 197 krb5_creds * *); 198krb5_error_code kssl_krb5_auth_con_init(krb5_context, 199 krb5_auth_context *); 200krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, 201 krb5_ccache cache, 202 krb5_principal *principal); 203krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context); 204size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype); 205krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype); 206krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * ); 207krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context, 208 krb5_auth_context, 209 krb5_rcache); 210krb5_error_code kssl_krb5_get_server_rcache(krb5_context, 211 krb5_const krb5_data *, 212 krb5_rcache *); 213krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context, 214 krb5_auth_context, 215 krb5_rcache *); 216 217/* Function pointers (almost all Kerberos functions are _stdcall) */ 218static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *) 219 =NULL; 220static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal ) 221 =NULL; 222static krb5_error_code(_stdcall *p_krb5_kt_resolve) 223 (krb5_context, krb5_const char *, krb5_keytab *)=NULL; 224static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context, 225 krb5_keytab *)=NULL; 226static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context, 227 krb5_ticket *)=NULL; 228static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context, 229 krb5_auth_context *, 230 krb5_const krb5_data *, 231 krb5_const_principal, 232 krb5_keytab, krb5_flags *, 233 krb5_ticket **)=NULL; 234static krb5_error_code (_stdcall *p_krb5_mk_req_extended) 235 (krb5_context, krb5_auth_context *, 236 krb5_const krb5_flags, krb5_data *, krb5_creds *, 237 krb5_data * )=NULL; 238static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL; 239static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL; 240static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context, 241 krb5_ccache *)=NULL; 242static krb5_error_code (_stdcall *p_krb5_sname_to_principal) 243 (krb5_context, krb5_const char *, krb5_const char *, 244 krb5_int32, krb5_principal *)=NULL; 245static krb5_error_code (_stdcall *p_krb5_get_credentials) 246 (krb5_context, krb5_const krb5_flags, krb5_ccache, 247 krb5_creds *, krb5_creds **)=NULL; 248static krb5_error_code (_stdcall *p_krb5_auth_con_init) 249 (krb5_context, krb5_auth_context *)=NULL; 250static krb5_error_code (_stdcall *p_krb5_cc_get_principal) 251 (krb5_context context, krb5_ccache cache, 252 krb5_principal *principal)=NULL; 253static krb5_error_code (_stdcall *p_krb5_auth_con_free) 254 (krb5_context, krb5_auth_context)=NULL; 255static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part) 256 (krb5_context, krb5_const krb5_keyblock *, 257 krb5_ticket *)=NULL; 258static krb5_error_code (_stdcall *p_krb5_timeofday) 259 (krb5_context context, krb5_int32 *timeret)=NULL; 260static krb5_error_code (_stdcall *p_krb5_rc_default) 261 (krb5_context context, krb5_rcache *rc)=NULL; 262static krb5_error_code (_stdcall *p_krb5_rc_initialize) 263 (krb5_context context, krb5_rcache rc, 264 krb5_deltat lifespan)=NULL; 265static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan) 266 (krb5_context context, krb5_rcache rc, 267 krb5_deltat *lifespan)=NULL; 268static krb5_error_code (_stdcall *p_krb5_rc_destroy) 269 (krb5_context context, krb5_rcache rc)=NULL; 270static krb5_boolean (_stdcall *p_krb5_principal_compare) 271 (krb5_context, krb5_const_principal, krb5_const_principal)=NULL; 272static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL; 273static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL; 274static krb5_error_code (_stdcall *p_krb5_kt_free_entry) 275 (krb5_context,krb5_keytab_entry * )=NULL; 276static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context, 277 krb5_auth_context, 278 krb5_rcache)=NULL; 279static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context, 280 krb5_const krb5_data *, 281 krb5_rcache *)=NULL; 282static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context, 283 krb5_auth_context, 284 krb5_rcache *)=NULL; 285static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context, 286 krb5_keytab keytab)=NULL; 287static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context, 288 krb5_keytab keytab, 289 krb5_const_principal principal, krb5_kvno vno, 290 krb5_enctype enctype, krb5_keytab_entry *entry)=NULL; 291static int krb5_loaded = 0; /* only attempt to initialize func ptrs once */ 292 293/* Function to Load the Kerberos 5 DLL and initialize function pointers */ 294void 295load_krb5_dll(void) 296 { 297 HANDLE hKRB5_32; 298 299 krb5_loaded++; 300 hKRB5_32 = LoadLibrary(TEXT("KRB5_32")); 301 if (!hKRB5_32) 302 return; 303 304 (FARPROC) p_krb5_free_data_contents = 305 GetProcAddress( hKRB5_32, "krb5_free_data_contents" ); 306 (FARPROC) p_krb5_free_context = 307 GetProcAddress( hKRB5_32, "krb5_free_context" ); 308 (FARPROC) p_krb5_auth_con_free = 309 GetProcAddress( hKRB5_32, "krb5_auth_con_free" ); 310 (FARPROC) p_krb5_free_principal = 311 GetProcAddress( hKRB5_32, "krb5_free_principal" ); 312 (FARPROC) p_krb5_mk_req_extended = 313 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" ); 314 (FARPROC) p_krb5_get_credentials = 315 GetProcAddress( hKRB5_32, "krb5_get_credentials" ); 316 (FARPROC) p_krb5_cc_get_principal = 317 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" ); 318 (FARPROC) p_krb5_cc_default = 319 GetProcAddress( hKRB5_32, "krb5_cc_default" ); 320 (FARPROC) p_krb5_sname_to_principal = 321 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" ); 322 (FARPROC) p_krb5_init_context = 323 GetProcAddress( hKRB5_32, "krb5_init_context" ); 324 (FARPROC) p_krb5_free_ticket = 325 GetProcAddress( hKRB5_32, "krb5_free_ticket" ); 326 (FARPROC) p_krb5_rd_req = 327 GetProcAddress( hKRB5_32, "krb5_rd_req" ); 328 (FARPROC) p_krb5_principal_compare = 329 GetProcAddress( hKRB5_32, "krb5_principal_compare" ); 330 (FARPROC) p_krb5_decrypt_tkt_part = 331 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" ); 332 (FARPROC) p_krb5_timeofday = 333 GetProcAddress( hKRB5_32, "krb5_timeofday" ); 334 (FARPROC) p_krb5_rc_default = 335 GetProcAddress( hKRB5_32, "krb5_rc_default" ); 336 (FARPROC) p_krb5_rc_initialize = 337 GetProcAddress( hKRB5_32, "krb5_rc_initialize" ); 338 (FARPROC) p_krb5_rc_get_lifespan = 339 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" ); 340 (FARPROC) p_krb5_rc_destroy = 341 GetProcAddress( hKRB5_32, "krb5_rc_destroy" ); 342 (FARPROC) p_krb5_kt_default = 343 GetProcAddress( hKRB5_32, "krb5_kt_default" ); 344 (FARPROC) p_krb5_kt_resolve = 345 GetProcAddress( hKRB5_32, "krb5_kt_resolve" ); 346 (FARPROC) p_krb5_auth_con_init = 347 GetProcAddress( hKRB5_32, "krb5_auth_con_init" ); 348 (FARPROC) p_valid_cksumtype = 349 GetProcAddress( hKRB5_32, "valid_cksumtype" ); 350 (FARPROC) p_krb5_checksum_size = 351 GetProcAddress( hKRB5_32, "krb5_checksum_size" ); 352 (FARPROC) p_krb5_kt_free_entry = 353 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" ); 354 (FARPROC) p_krb5_auth_con_setrcache = 355 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" ); 356 (FARPROC) p_krb5_get_server_rcache = 357 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" ); 358 (FARPROC) p_krb5_auth_con_getrcache = 359 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" ); 360 (FARPROC) p_krb5_kt_close = 361 GetProcAddress( hKRB5_32, "krb5_kt_close" ); 362 (FARPROC) p_krb5_kt_get_entry = 363 GetProcAddress( hKRB5_32, "krb5_kt_get_entry" ); 364 } 365 366/* Stubs for each function to be dynamicly loaded */ 367void 368kssl_krb5_free_data_contents(krb5_context CO, krb5_data * data) 369 { 370 if (!krb5_loaded) 371 load_krb5_dll(); 372 373 if ( p_krb5_free_data_contents ) 374 p_krb5_free_data_contents(CO,data); 375 } 376 377krb5_error_code 378kssl_krb5_mk_req_extended (krb5_context CO, 379 krb5_auth_context * pACO, 380 krb5_const krb5_flags F, 381 krb5_data * pD1, 382 krb5_creds * pC, 383 krb5_data * pD2) 384 { 385 if (!krb5_loaded) 386 load_krb5_dll(); 387 388 if ( p_krb5_mk_req_extended ) 389 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2)); 390 else 391 return KRB5KRB_ERR_GENERIC; 392 } 393krb5_error_code 394kssl_krb5_auth_con_init(krb5_context CO, 395 krb5_auth_context * pACO) 396 { 397 if (!krb5_loaded) 398 load_krb5_dll(); 399 400 if ( p_krb5_auth_con_init ) 401 return(p_krb5_auth_con_init(CO,pACO)); 402 else 403 return KRB5KRB_ERR_GENERIC; 404 } 405krb5_error_code 406kssl_krb5_auth_con_free (krb5_context CO, 407 krb5_auth_context ACO) 408 { 409 if (!krb5_loaded) 410 load_krb5_dll(); 411 412 if ( p_krb5_auth_con_free ) 413 return(p_krb5_auth_con_free(CO,ACO)); 414 else 415 return KRB5KRB_ERR_GENERIC; 416 } 417krb5_error_code 418kssl_krb5_get_credentials(krb5_context CO, 419 krb5_const krb5_flags F, 420 krb5_ccache CC, 421 krb5_creds * pCR, 422 krb5_creds ** ppCR) 423 { 424 if (!krb5_loaded) 425 load_krb5_dll(); 426 427 if ( p_krb5_get_credentials ) 428 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR)); 429 else 430 return KRB5KRB_ERR_GENERIC; 431 } 432krb5_error_code 433kssl_krb5_sname_to_principal(krb5_context CO, 434 krb5_const char * pC1, 435 krb5_const char * pC2, 436 krb5_int32 I, 437 krb5_principal * pPR) 438 { 439 if (!krb5_loaded) 440 load_krb5_dll(); 441 442 if ( p_krb5_sname_to_principal ) 443 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR)); 444 else 445 return KRB5KRB_ERR_GENERIC; 446 } 447 448krb5_error_code 449kssl_krb5_cc_default(krb5_context CO, 450 krb5_ccache * pCC) 451 { 452 if (!krb5_loaded) 453 load_krb5_dll(); 454 455 if ( p_krb5_cc_default ) 456 return(p_krb5_cc_default(CO,pCC)); 457 else 458 return KRB5KRB_ERR_GENERIC; 459 } 460 461krb5_error_code 462kssl_krb5_init_context(krb5_context * pCO) 463 { 464 if (!krb5_loaded) 465 load_krb5_dll(); 466 467 if ( p_krb5_init_context ) 468 return(p_krb5_init_context(pCO)); 469 else 470 return KRB5KRB_ERR_GENERIC; 471 } 472 473void 474kssl_krb5_free_context(krb5_context CO) 475 { 476 if (!krb5_loaded) 477 load_krb5_dll(); 478 479 if ( p_krb5_free_context ) 480 p_krb5_free_context(CO); 481 } 482 483void 484kssl_krb5_free_principal(krb5_context c, krb5_principal p) 485 { 486 if (!krb5_loaded) 487 load_krb5_dll(); 488 489 if ( p_krb5_free_principal ) 490 p_krb5_free_principal(c,p); 491 } 492 493krb5_error_code 494kssl_krb5_kt_resolve(krb5_context con, 495 krb5_const char * sz, 496 krb5_keytab * kt) 497 { 498 if (!krb5_loaded) 499 load_krb5_dll(); 500 501 if ( p_krb5_kt_resolve ) 502 return(p_krb5_kt_resolve(con,sz,kt)); 503 else 504 return KRB5KRB_ERR_GENERIC; 505 } 506 507krb5_error_code 508kssl_krb5_kt_default(krb5_context con, 509 krb5_keytab * kt) 510 { 511 if (!krb5_loaded) 512 load_krb5_dll(); 513 514 if ( p_krb5_kt_default ) 515 return(p_krb5_kt_default(con,kt)); 516 else 517 return KRB5KRB_ERR_GENERIC; 518 } 519 520krb5_error_code 521kssl_krb5_free_ticket(krb5_context con, 522 krb5_ticket * kt) 523 { 524 if (!krb5_loaded) 525 load_krb5_dll(); 526 527 if ( p_krb5_free_ticket ) 528 return(p_krb5_free_ticket(con,kt)); 529 else 530 return KRB5KRB_ERR_GENERIC; 531 } 532 533krb5_error_code 534kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon, 535 krb5_const krb5_data * data, 536 krb5_const_principal princ, krb5_keytab keytab, 537 krb5_flags * flags, krb5_ticket ** pptkt) 538 { 539 if (!krb5_loaded) 540 load_krb5_dll(); 541 542 if ( p_krb5_rd_req ) 543 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt)); 544 else 545 return KRB5KRB_ERR_GENERIC; 546 } 547 548krb5_boolean 549krb5_principal_compare(krb5_context con, krb5_const_principal princ1, 550 krb5_const_principal princ2) 551 { 552 if (!krb5_loaded) 553 load_krb5_dll(); 554 555 if ( p_krb5_principal_compare ) 556 return(p_krb5_principal_compare(con,princ1,princ2)); 557 else 558 return KRB5KRB_ERR_GENERIC; 559 } 560 561krb5_error_code 562krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys, 563 krb5_ticket *ticket) 564 { 565 if (!krb5_loaded) 566 load_krb5_dll(); 567 568 if ( p_krb5_decrypt_tkt_part ) 569 return(p_krb5_decrypt_tkt_part(con,keys,ticket)); 570 else 571 return KRB5KRB_ERR_GENERIC; 572 } 573 574krb5_error_code 575krb5_timeofday(krb5_context con, krb5_int32 *timeret) 576 { 577 if (!krb5_loaded) 578 load_krb5_dll(); 579 580 if ( p_krb5_timeofday ) 581 return(p_krb5_timeofday(con,timeret)); 582 else 583 return KRB5KRB_ERR_GENERIC; 584 } 585 586krb5_error_code 587krb5_rc_default(krb5_context con, krb5_rcache *rc) 588 { 589 if (!krb5_loaded) 590 load_krb5_dll(); 591 592 if ( p_krb5_rc_default ) 593 return(p_krb5_rc_default(con,rc)); 594 else 595 return KRB5KRB_ERR_GENERIC; 596 } 597 598krb5_error_code 599krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan) 600 { 601 if (!krb5_loaded) 602 load_krb5_dll(); 603 604 if ( p_krb5_rc_initialize ) 605 return(p_krb5_rc_initialize(con, rc, lifespan)); 606 else 607 return KRB5KRB_ERR_GENERIC; 608 } 609 610krb5_error_code 611krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp) 612 { 613 if (!krb5_loaded) 614 load_krb5_dll(); 615 616 if ( p_krb5_rc_get_lifespan ) 617 return(p_krb5_rc_get_lifespan(con, rc, lifespanp)); 618 else 619 return KRB5KRB_ERR_GENERIC; 620 } 621 622krb5_error_code 623krb5_rc_destroy(krb5_context con, krb5_rcache rc) 624 { 625 if (!krb5_loaded) 626 load_krb5_dll(); 627 628 if ( p_krb5_rc_destroy ) 629 return(p_krb5_rc_destroy(con, rc)); 630 else 631 return KRB5KRB_ERR_GENERIC; 632 } 633 634size_t 635krb5_checksum_size(krb5_context context,krb5_cksumtype ctype) 636 { 637 if (!krb5_loaded) 638 load_krb5_dll(); 639 640 if ( p_krb5_checksum_size ) 641 return(p_krb5_checksum_size(context, ctype)); 642 else 643 return KRB5KRB_ERR_GENERIC; 644 } 645 646krb5_boolean 647valid_cksumtype(krb5_cksumtype ctype) 648 { 649 if (!krb5_loaded) 650 load_krb5_dll(); 651 652 if ( p_valid_cksumtype ) 653 return(p_valid_cksumtype(ctype)); 654 else 655 return KRB5KRB_ERR_GENERIC; 656 } 657 658krb5_error_code 659krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry) 660 { 661 if (!krb5_loaded) 662 load_krb5_dll(); 663 664 if ( p_krb5_kt_free_entry ) 665 return(p_krb5_kt_free_entry(con,entry)); 666 else 667 return KRB5KRB_ERR_GENERIC; 668 } 669 670/* Structure definitions */ 671#ifndef NO_DEF_KRB5_CCACHE 672#ifndef krb5_x 673#define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1)) 674#define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0)) 675#endif 676 677typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */ 678 679typedef struct _krb5_ccache 680 { 681 krb5_magic magic; 682 struct _krb5_cc_ops FAR *ops; 683 krb5_pointer data; 684 } *krb5_ccache; 685 686typedef struct _krb5_cc_ops 687 { 688 krb5_magic magic; 689 char *prefix; 690 char * (KRB5_CALLCONV *get_name) 691 (krb5_context, krb5_ccache); 692 krb5_error_code (KRB5_CALLCONV *resolve) 693 (krb5_context, krb5_ccache *, const char *); 694 krb5_error_code (KRB5_CALLCONV *gen_new) 695 (krb5_context, krb5_ccache *); 696 krb5_error_code (KRB5_CALLCONV *init) 697 (krb5_context, krb5_ccache, krb5_principal); 698 krb5_error_code (KRB5_CALLCONV *destroy) 699 (krb5_context, krb5_ccache); 700 krb5_error_code (KRB5_CALLCONV *close) 701 (krb5_context, krb5_ccache); 702 krb5_error_code (KRB5_CALLCONV *store) 703 (krb5_context, krb5_ccache, krb5_creds *); 704 krb5_error_code (KRB5_CALLCONV *retrieve) 705 (krb5_context, krb5_ccache, 706 krb5_flags, krb5_creds *, krb5_creds *); 707 krb5_error_code (KRB5_CALLCONV *get_princ) 708 (krb5_context, krb5_ccache, krb5_principal *); 709 krb5_error_code (KRB5_CALLCONV *get_first) 710 (krb5_context, krb5_ccache, krb5_cc_cursor *); 711 krb5_error_code (KRB5_CALLCONV *get_next) 712 (krb5_context, krb5_ccache, 713 krb5_cc_cursor *, krb5_creds *); 714 krb5_error_code (KRB5_CALLCONV *end_get) 715 (krb5_context, krb5_ccache, krb5_cc_cursor *); 716 krb5_error_code (KRB5_CALLCONV *remove_cred) 717 (krb5_context, krb5_ccache, 718 krb5_flags, krb5_creds *); 719 krb5_error_code (KRB5_CALLCONV *set_flags) 720 (krb5_context, krb5_ccache, krb5_flags); 721 } krb5_cc_ops; 722#endif /* NO_DEF_KRB5_CCACHE */ 723 724krb5_error_code 725kssl_krb5_cc_get_principal 726 (krb5_context context, krb5_ccache cache, 727 krb5_principal *principal) 728 { 729 if ( p_krb5_cc_get_principal ) 730 return(p_krb5_cc_get_principal(context,cache,principal)); 731 else 732 return(krb5_x 733 ((cache)->ops->get_princ,(context, cache, principal))); 734 } 735 736krb5_error_code 737kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon, 738 krb5_rcache rcache) 739 { 740 if ( p_krb5_auth_con_setrcache ) 741 return(p_krb5_auth_con_setrcache(con,acon,rcache)); 742 else 743 return KRB5KRB_ERR_GENERIC; 744 } 745 746krb5_error_code 747kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data, 748 krb5_rcache * rcache) 749 { 750 if ( p_krb5_get_server_rcache ) 751 return(p_krb5_get_server_rcache(con,data,rcache)); 752 else 753 return KRB5KRB_ERR_GENERIC; 754 } 755 756krb5_error_code 757kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon, 758 krb5_rcache * prcache) 759 { 760 if ( p_krb5_auth_con_getrcache ) 761 return(p_krb5_auth_con_getrcache(con,acon, prcache)); 762 else 763 return KRB5KRB_ERR_GENERIC; 764 } 765 766krb5_error_code 767kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab) 768 { 769 if ( p_krb5_kt_close ) 770 return(p_krb5_kt_close(context,keytab)); 771 else 772 return KRB5KRB_ERR_GENERIC; 773 } 774 775krb5_error_code 776kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab, 777 krb5_const_principal principal, krb5_kvno vno, 778 krb5_enctype enctype, krb5_keytab_entry *entry) 779 { 780 if ( p_krb5_kt_get_entry ) 781 return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry)); 782 else 783 return KRB5KRB_ERR_GENERIC; 784 } 785#endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */ 786 787char 788*kstring(char *string) 789 { 790 static char *null = "[NULL]"; 791 792 return ((string == NULL)? null: string); 793 } 794 795/* Given KRB5 enctype (basically DES or 3DES), 796** return closest match openssl EVP_ encryption algorithm. 797** Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes. 798** Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK. 799*/ 800const EVP_CIPHER * 801kssl_map_enc(krb5_enctype enctype) 802 { 803 switch (enctype) 804 { 805 case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */ 806 case ENCTYPE_DES_CBC_CRC: 807 case ENCTYPE_DES_CBC_MD4: 808 case ENCTYPE_DES_CBC_MD5: 809 case ENCTYPE_DES_CBC_RAW: 810 return EVP_des_cbc(); 811 break; 812 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 813 case ENCTYPE_DES3_CBC_SHA: 814 case ENCTYPE_DES3_CBC_RAW: 815 return EVP_des_ede3_cbc(); 816 break; 817 default: return NULL; 818 break; 819 } 820 } 821 822 823/* Return true:1 if p "looks like" the start of the real authenticator 824** described in kssl_skip_confound() below. The ASN.1 pattern is 825** "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and 826** xx and yy are possibly multi-byte length fields. 827*/ 828int kssl_test_confound(unsigned char *p) 829 { 830 int len = 2; 831 int xx = 0, yy = 0; 832 833 if (*p++ != 0x62) return 0; 834 if (*p > 0x82) return 0; 835 switch(*p) { 836 case 0x82: p++; xx = (*p++ << 8); xx += *p++; break; 837 case 0x81: p++; xx = *p++; break; 838 case 0x80: return 0; 839 default: xx = *p++; break; 840 } 841 if (*p++ != 0x30) return 0; 842 if (*p > 0x82) return 0; 843 switch(*p) { 844 case 0x82: p++; len+=2; yy = (*p++ << 8); yy += *p++; break; 845 case 0x81: p++; len++; yy = *p++; break; 846 case 0x80: return 0; 847 default: yy = *p++; break; 848 } 849 850 return (xx - len == yy)? 1: 0; 851 } 852 853/* Allocate, fill, and return cksumlens array of checksum lengths. 854** This array holds just the unique elements from the krb5_cksumarray[]. 855** array[n] == 0 signals end of data. 856** 857** The krb5_cksumarray[] was an internal variable that has since been 858** replaced by a more general method for storing the data. It should 859** not be used. Instead we use real API calls and make a guess for 860** what the highest assigned CKSUMTYPE_ constant is. As of 1.2.2 861** it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3). So we will use 0x0010. 862*/ 863size_t *populate_cksumlens(void) 864 { 865 int i, j, n; 866 static size_t *cklens = NULL; 867 868#ifdef KRB5_MIT_OLD11 869 n = krb5_max_cksum; 870#else 871 n = 0x0010; 872#endif /* KRB5_MIT_OLD11 */ 873 874#ifdef KRB5CHECKAUTH 875 if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1))) return NULL; 876 877 for (i=0; i < n; i++) { 878 if (!valid_cksumtype(i)) continue; /* array has holes */ 879 for (j=0; j < n; j++) { 880 if (cklens[j] == 0) { 881 cklens[j] = krb5_checksum_size(NULL,i); 882 break; /* krb5 elem was new: add */ 883 } 884 if (cklens[j] == krb5_checksum_size(NULL,i)) { 885 break; /* ignore duplicate elements */ 886 } 887 } 888 } 889#endif /* KRB5CHECKAUTH */ 890 891 return cklens; 892 } 893 894/* Return pointer to start of real authenticator within authenticator, or 895** return NULL on error. 896** Decrypted authenticator looks like this: 897** [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r] 898** This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the 899** krb5_auth_con_getcksumtype() function advertised in its krb5.h. 900*/ 901unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a) 902 { 903 int i, conlen; 904 size_t cklen; 905 static size_t *cksumlens = NULL; 906 unsigned char *test_auth; 907 908 conlen = (etype)? 8: 0; 909 910 if (!cksumlens && !(cksumlens = populate_cksumlens())) return NULL; 911 for (i=0; (cklen = cksumlens[i]) != 0; i++) 912 { 913 test_auth = a + conlen + cklen; 914 if (kssl_test_confound(test_auth)) return test_auth; 915 } 916 917 return NULL; 918 } 919 920 921/* Set kssl_err error info when reason text is a simple string 922** kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; } 923*/ 924void 925kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text) 926 { 927 if (kssl_err == NULL) return; 928 929 kssl_err->reason = reason; 930 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text); 931 return; 932 } 933 934 935/* Display contents of krb5_data struct, for debugging 936*/ 937void 938print_krb5_data(char *label, krb5_data *kdata) 939 { 940 int i; 941 942 printf("%s[%d] ", label, kdata->length); 943 for (i=0; i < (int)kdata->length; i++) 944 { 945 if (0 && isprint((int) kdata->data[i])) 946 printf( "%c ", kdata->data[i]); 947 else 948 printf( "%02x ", (unsigned char) kdata->data[i]); 949 } 950 printf("\n"); 951 } 952 953 954/* Display contents of krb5_authdata struct, for debugging 955*/ 956void 957print_krb5_authdata(char *label, krb5_authdata **adata) 958 { 959 if (adata == NULL) 960 { 961 printf("%s, authdata==0\n", label); 962 return; 963 } 964 printf("%s [%p]\n", label, (void *)adata); 965#if 0 966 { 967 int i; 968 printf("%s[at%d:%d] ", label, adata->ad_type, adata->length); 969 for (i=0; i < adata->length; i++) 970 { 971 printf((isprint(adata->contents[i]))? "%c ": "%02x", 972 adata->contents[i]); 973 } 974 printf("\n"); 975 } 976#endif 977 } 978 979 980/* Display contents of krb5_keyblock struct, for debugging 981*/ 982void 983print_krb5_keyblock(char *label, krb5_keyblock *keyblk) 984 { 985 int i; 986 987 if (keyblk == NULL) 988 { 989 printf("%s, keyblk==0\n", label); 990 return; 991 } 992#ifdef KRB5_HEIMDAL 993 printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype, 994 keyblk->keyvalue->length); 995 for (i=0; i < (int)keyblk->keyvalue->length; i++) 996 { 997 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]); 998 } 999 printf("\n"); 1000#else 1001 printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length); 1002 for (i=0; i < (int)keyblk->length; i++) 1003 { 1004 printf("%02x",keyblk->contents[i]); 1005 } 1006 printf("\n"); 1007#endif 1008 } 1009 1010 1011/* Display contents of krb5_principal_data struct, for debugging 1012** (krb5_principal is typedef'd == krb5_principal_data *) 1013*/ 1014void 1015print_krb5_princ(char *label, krb5_principal_data *princ) 1016 { 1017 int i, ui, uj; 1018 1019 printf("%s principal Realm: ", label); 1020 if (princ == NULL) return; 1021 for (ui=0; ui < (int)princ->realm.length; ui++) putchar(princ->realm.data[ui]); 1022 printf(" (nametype %d) has %d strings:\n", princ->type,princ->length); 1023 for (i=0; i < (int)princ->length; i++) 1024 { 1025 printf("\t%d [%d]: ", i, princ->data[i].length); 1026 for (uj=0; uj < (int)princ->data[i].length; uj++) { 1027 putchar(princ->data[i].data[uj]); 1028 } 1029 printf("\n"); 1030 } 1031 return; 1032 } 1033 1034 1035/* Given krb5 service (typically "kssl") and hostname in kssl_ctx, 1036** Return encrypted Kerberos ticket for service @ hostname. 1037** If authenp is non-NULL, also return encrypted authenticator, 1038** whose data should be freed by caller. 1039** (Originally was: Create Kerberos AP_REQ message for SSL Client.) 1040** 1041** 19990628 VRS Started; Returns Kerberos AP_REQ message. 1042** 20010409 VRS Modified for RFC2712; Returns enc tkt. 1043** 20010606 VRS May also return optional authenticator. 1044*/ 1045krb5_error_code 1046kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1047 /* OUT */ krb5_data **enc_ticketp, 1048 /* UPDATE */ krb5_data *authenp, 1049 /* OUT */ KSSL_ERR *kssl_err) 1050 { 1051 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1052 krb5_context krb5context = NULL; 1053 krb5_auth_context krb5auth_context = NULL; 1054 krb5_ccache krb5ccdef = NULL; 1055 krb5_creds krb5creds, *krb5credsp = NULL; 1056 krb5_data krb5_app_req; 1057 1058 kssl_err_set(kssl_err, 0, ""); 1059 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1060 1061 if (!kssl_ctx) 1062 { 1063 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1064 "No kssl_ctx defined.\n"); 1065 goto err; 1066 } 1067 else if (!kssl_ctx->service_host) 1068 { 1069 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1070 "kssl_ctx service_host undefined.\n"); 1071 goto err; 1072 } 1073 1074 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1075 { 1076 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, 1077 "krb5_init_context() fails: %d\n", krb5rc); 1078 kssl_err->reason = SSL_R_KRB5_C_INIT; 1079 goto err; 1080 } 1081 1082 if ((krb5rc = krb5_sname_to_principal(krb5context, 1083 kssl_ctx->service_host, 1084 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1085 KRB5_NT_SRV_HST, &krb5creds.server)) != 0) 1086 { 1087 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, 1088 "krb5_sname_to_principal() fails for %s/%s\n", 1089 kssl_ctx->service_host, 1090 (kssl_ctx->service_name)? kssl_ctx->service_name: 1091 KRB5SVC); 1092 kssl_err->reason = SSL_R_KRB5_C_INIT; 1093 goto err; 1094 } 1095 1096 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1097 { 1098 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1099 "krb5_cc_default fails.\n"); 1100 goto err; 1101 } 1102 1103 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1104 &krb5creds.client)) != 0) 1105 { 1106 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1107 "krb5_cc_get_principal() fails.\n"); 1108 goto err; 1109 } 1110 1111 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1112 &krb5creds, &krb5credsp)) != 0) 1113 { 1114 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED, 1115 "krb5_get_credentials() fails.\n"); 1116 goto err; 1117 } 1118 1119 *enc_ticketp = &krb5credsp->ticket; 1120#ifdef KRB5_HEIMDAL 1121 kssl_ctx->enctype = krb5credsp->session.keytype; 1122#else 1123 kssl_ctx->enctype = krb5credsp->keyblock.enctype; 1124#endif 1125 1126 krb5rc = KRB5KRB_ERR_GENERIC; 1127 /* caller should free data of krb5_app_req */ 1128 /* 20010406 VRS deleted for real KerberosWrapper 1129 ** 20010605 VRS reinstated to offer Authenticator to KerberosWrapper 1130 */ 1131 krb5_app_req.length = 0; 1132 if (authenp) 1133 { 1134 krb5_data krb5in_data; 1135 const unsigned char *p; 1136 long arlen; 1137 KRB5_APREQBODY *ap_req; 1138 1139 authenp->length = 0; 1140 krb5in_data.data = NULL; 1141 krb5in_data.length = 0; 1142 if ((krb5rc = krb5_mk_req_extended(krb5context, 1143 &krb5auth_context, 0, &krb5in_data, krb5credsp, 1144 &krb5_app_req)) != 0) 1145 { 1146 kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ, 1147 "krb5_mk_req_extended() fails.\n"); 1148 goto err; 1149 } 1150 1151 arlen = krb5_app_req.length; 1152 p = (unsigned char *)krb5_app_req.data; 1153 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen); 1154 if (ap_req) 1155 { 1156 authenp->length = i2d_KRB5_ENCDATA( 1157 ap_req->authenticator, NULL); 1158 if (authenp->length && 1159 (authenp->data = malloc(authenp->length))) 1160 { 1161 unsigned char *adp = (unsigned char *)authenp->data; 1162 authenp->length = i2d_KRB5_ENCDATA( 1163 ap_req->authenticator, &adp); 1164 } 1165 } 1166 1167 if (ap_req) KRB5_APREQ_free((KRB5_APREQ *) ap_req); 1168 if (krb5_app_req.length) 1169 kssl_krb5_free_data_contents(krb5context,&krb5_app_req); 1170 } 1171#ifdef KRB5_HEIMDAL 1172 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session)) 1173 { 1174 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1175 "kssl_ctx_setkey() fails.\n"); 1176 } 1177#else 1178 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock)) 1179 { 1180 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1181 "kssl_ctx_setkey() fails.\n"); 1182 } 1183#endif 1184 else krb5rc = 0; 1185 1186 err: 1187#ifdef KSSL_DEBUG 1188 kssl_ctx_show(kssl_ctx); 1189#endif /* KSSL_DEBUG */ 1190 1191 if (krb5creds.client) krb5_free_principal(krb5context, 1192 krb5creds.client); 1193 if (krb5creds.server) krb5_free_principal(krb5context, 1194 krb5creds.server); 1195 if (krb5auth_context) krb5_auth_con_free(krb5context, 1196 krb5auth_context); 1197 if (krb5context) krb5_free_context(krb5context); 1198 return (krb5rc); 1199 } 1200 1201 1202/* Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket. 1203** Return Kerberos error code and kssl_err struct on error. 1204** Allocates krb5_ticket and krb5_principal; caller should free these. 1205** 1206** 20010410 VRS Implemented krb5_decode_ticket() as 1207** old_krb5_decode_ticket(). Missing from MIT1.0.6. 1208** 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions. 1209** Re-used some of the old krb5_decode_ticket() 1210** code here. This tkt should alloc/free just 1211** like the real thing. 1212*/ 1213krb5_error_code 1214kssl_TKT2tkt( /* IN */ krb5_context krb5context, 1215 /* IN */ KRB5_TKTBODY *asn1ticket, 1216 /* OUT */ krb5_ticket **krb5ticket, 1217 /* OUT */ KSSL_ERR *kssl_err ) 1218 { 1219 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1220 krb5_ticket *new5ticket = NULL; 1221 ASN1_GENERALSTRING *gstr_svc, *gstr_host; 1222 1223 *krb5ticket = NULL; 1224 1225 if (asn1ticket == NULL || asn1ticket->realm == NULL || 1226 asn1ticket->sname == NULL || 1227 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2) 1228 { 1229 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1230 "Null field in asn1ticket.\n"); 1231 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1232 return KRB5KRB_ERR_GENERIC; 1233 } 1234 1235 if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL) 1236 { 1237 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1238 "Unable to allocate new krb5_ticket.\n"); 1239 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1240 return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */ 1241 } 1242 1243 gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0); 1244 gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1); 1245 1246 if ((krb5rc = kssl_build_principal_2(krb5context, 1247 &new5ticket->server, 1248 asn1ticket->realm->length, (char *)asn1ticket->realm->data, 1249 gstr_svc->length, (char *)gstr_svc->data, 1250 gstr_host->length, (char *)gstr_host->data)) != 0) 1251 { 1252 free(new5ticket); 1253 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1254 "Error building ticket server principal.\n"); 1255 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1256 return krb5rc; /* or KRB5KRB_ERR_GENERIC; */ 1257 } 1258 1259 krb5_princ_type(krb5context, new5ticket->server) = 1260 asn1ticket->sname->nametype->data[0]; 1261 new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0]; 1262 new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0]; 1263 new5ticket->enc_part.ciphertext.length = 1264 asn1ticket->encdata->cipher->length; 1265 if ((new5ticket->enc_part.ciphertext.data = 1266 calloc(1, asn1ticket->encdata->cipher->length)) == NULL) 1267 { 1268 free(new5ticket); 1269 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1270 "Error allocating cipher in krb5ticket.\n"); 1271 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1272 return KRB5KRB_ERR_GENERIC; 1273 } 1274 else 1275 { 1276 memcpy(new5ticket->enc_part.ciphertext.data, 1277 asn1ticket->encdata->cipher->data, 1278 asn1ticket->encdata->cipher->length); 1279 } 1280 1281 *krb5ticket = new5ticket; 1282 return 0; 1283 } 1284 1285 1286/* Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"), 1287** and krb5 AP_REQ message & message length, 1288** Return Kerberos session key and client principle 1289** to SSL Server in KSSL_CTX *kssl_ctx. 1290** 1291** 19990702 VRS Started. 1292*/ 1293krb5_error_code 1294kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1295 /* IN */ krb5_data *indata, 1296 /* OUT */ krb5_ticket_times *ttimes, 1297 /* OUT */ KSSL_ERR *kssl_err ) 1298 { 1299 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1300 static krb5_context krb5context = NULL; 1301 static krb5_auth_context krb5auth_context = NULL; 1302 krb5_ticket *krb5ticket = NULL; 1303 KRB5_TKTBODY *asn1ticket = NULL; 1304 const unsigned char *p; 1305 krb5_keytab krb5keytab = NULL; 1306 krb5_keytab_entry kt_entry; 1307 krb5_principal krb5server; 1308 krb5_rcache rcache = NULL; 1309 1310 kssl_err_set(kssl_err, 0, ""); 1311 1312 if (!kssl_ctx) 1313 { 1314 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1315 "No kssl_ctx defined.\n"); 1316 goto err; 1317 } 1318 1319#ifdef KSSL_DEBUG 1320 printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name)); 1321#endif /* KSSL_DEBUG */ 1322 1323 if (!krb5context && (krb5rc = krb5_init_context(&krb5context))) 1324 { 1325 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1326 "krb5_init_context() fails.\n"); 1327 goto err; 1328 } 1329 if (krb5auth_context && 1330 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context))) 1331 { 1332 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1333 "krb5_auth_con_free() fails.\n"); 1334 goto err; 1335 } 1336 else krb5auth_context = NULL; 1337 if (!krb5auth_context && 1338 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context))) 1339 { 1340 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1341 "krb5_auth_con_init() fails.\n"); 1342 goto err; 1343 } 1344 1345 1346 if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context, 1347 &rcache))) 1348 { 1349 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1350 "krb5_auth_con_getrcache() fails.\n"); 1351 goto err; 1352 } 1353 1354 if ((krb5rc = krb5_sname_to_principal(krb5context, NULL, 1355 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1356 KRB5_NT_SRV_HST, &krb5server)) != 0) 1357 { 1358 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1359 "krb5_sname_to_principal() fails.\n"); 1360 goto err; 1361 } 1362 1363 if (rcache == NULL) 1364 { 1365 if ((krb5rc = krb5_get_server_rcache(krb5context, 1366 krb5_princ_component(krb5context, krb5server, 0), 1367 &rcache))) 1368 { 1369 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1370 "krb5_get_server_rcache() fails.\n"); 1371 goto err; 1372 } 1373 } 1374 1375 if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache))) 1376 { 1377 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1378 "krb5_auth_con_setrcache() fails.\n"); 1379 goto err; 1380 } 1381 1382 1383 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default 1384 */ 1385 if (kssl_ctx->keytab_file) 1386 { 1387 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1388 &krb5keytab); 1389 if (krb5rc) 1390 { 1391 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1392 "krb5_kt_resolve() fails.\n"); 1393 goto err; 1394 } 1395 } 1396 else 1397 { 1398 krb5rc = krb5_kt_default(krb5context,&krb5keytab); 1399 if (krb5rc) 1400 { 1401 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1402 "krb5_kt_default() fails.\n"); 1403 goto err; 1404 } 1405 } 1406 1407 /* Actual Kerberos5 krb5_recvauth() has initial conversation here 1408 ** o check KRB5_SENDAUTH_BADAUTHVERS 1409 ** unless KRB5_RECVAUTH_SKIP_VERSION 1410 ** o check KRB5_SENDAUTH_BADAPPLVERS 1411 ** o send "0" msg if all OK 1412 */ 1413 1414 /* 20010411 was using AP_REQ instead of true KerberosWrapper 1415 ** 1416 ** if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context, 1417 ** &krb5in_data, krb5server, krb5keytab, 1418 ** &ap_option, &krb5ticket)) != 0) { Error } 1419 */ 1420 1421 p = (unsigned char *)indata->data; 1422 if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p, 1423 (long) indata->length)) == NULL) 1424 { 1425 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1426 "d2i_KRB5_TICKET() ASN.1 decode failure.\n"); 1427 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1428 goto err; 1429 } 1430 1431 /* Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */ 1432 if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket, 1433 kssl_err)) != 0) 1434 { 1435 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1436 "Error converting ASN.1 ticket to krb5_ticket.\n"); 1437 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1438 goto err; 1439 } 1440 1441 if (! krb5_principal_compare(krb5context, krb5server, 1442 krb5ticket->server)) { 1443 krb5rc = KRB5_PRINC_NOMATCH; 1444 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1445 "server principal != ticket principal\n"); 1446 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1447 goto err; 1448 } 1449 if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1450 krb5ticket->server, krb5ticket->enc_part.kvno, 1451 krb5ticket->enc_part.enctype, &kt_entry)) != 0) { 1452 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1453 "krb5_kt_get_entry() fails with %x.\n", krb5rc); 1454 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1455 goto err; 1456 } 1457 if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key, 1458 krb5ticket)) != 0) { 1459 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1460 "krb5_decrypt_tkt_part() failed.\n"); 1461 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1462 goto err; 1463 } 1464 else { 1465 krb5_kt_free_entry(krb5context, &kt_entry); 1466#ifdef KSSL_DEBUG 1467 { 1468 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs; 1469 printf("Decrypted ticket fields:\n"); 1470 printf("\tflags: %X, transit-type: %X", 1471 krb5ticket->enc_part2->flags, 1472 krb5ticket->enc_part2->transited.tr_type); 1473 print_krb5_data("\ttransit-data: ", 1474 &(krb5ticket->enc_part2->transited.tr_contents)); 1475 printf("\tcaddrs: %p, authdata: %p\n", 1476 krb5ticket->enc_part2->caddrs, 1477 krb5ticket->enc_part2->authorization_data); 1478 if (paddr) 1479 { 1480 printf("\tcaddrs:\n"); 1481 for (i=0; paddr[i] != NULL; i++) 1482 { 1483 krb5_data d; 1484 d.length=paddr[i]->length; 1485 d.data=paddr[i]->contents; 1486 print_krb5_data("\t\tIP: ", &d); 1487 } 1488 } 1489 printf("\tstart/auth/end times: %d / %d / %d\n", 1490 krb5ticket->enc_part2->times.starttime, 1491 krb5ticket->enc_part2->times.authtime, 1492 krb5ticket->enc_part2->times.endtime); 1493 } 1494#endif /* KSSL_DEBUG */ 1495 } 1496 1497 krb5rc = KRB5_NO_TKT_SUPPLIED; 1498 if (!krb5ticket || !krb5ticket->enc_part2 || 1499 !krb5ticket->enc_part2->client || 1500 !krb5ticket->enc_part2->client->data || 1501 !krb5ticket->enc_part2->session) 1502 { 1503 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1504 "bad ticket from krb5_rd_req.\n"); 1505 } 1506 else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT, 1507 &krb5ticket->enc_part2->client->realm, 1508 krb5ticket->enc_part2->client->data, 1509 krb5ticket->enc_part2->client->length)) 1510 { 1511 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1512 "kssl_ctx_setprinc() fails.\n"); 1513 } 1514 else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session)) 1515 { 1516 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1517 "kssl_ctx_setkey() fails.\n"); 1518 } 1519 else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID) 1520 { 1521 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID; 1522 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1523 "invalid ticket from krb5_rd_req.\n"); 1524 } 1525 else krb5rc = 0; 1526 1527 kssl_ctx->enctype = krb5ticket->enc_part.enctype; 1528 ttimes->authtime = krb5ticket->enc_part2->times.authtime; 1529 ttimes->starttime = krb5ticket->enc_part2->times.starttime; 1530 ttimes->endtime = krb5ticket->enc_part2->times.endtime; 1531 ttimes->renew_till = krb5ticket->enc_part2->times.renew_till; 1532 1533 err: 1534#ifdef KSSL_DEBUG 1535 kssl_ctx_show(kssl_ctx); 1536#endif /* KSSL_DEBUG */ 1537 1538 if (asn1ticket) KRB5_TICKET_free((KRB5_TICKET *) asn1ticket); 1539 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab); 1540 if (krb5ticket) krb5_free_ticket(krb5context, krb5ticket); 1541 if (krb5server) krb5_free_principal(krb5context, krb5server); 1542 return (krb5rc); 1543 } 1544 1545 1546/* Allocate & return a new kssl_ctx struct. 1547*/ 1548KSSL_CTX * 1549kssl_ctx_new(void) 1550 { 1551 return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX))); 1552 } 1553 1554 1555/* Frees a kssl_ctx struct and any allocated memory it holds. 1556** Returns NULL. 1557*/ 1558KSSL_CTX * 1559kssl_ctx_free(KSSL_CTX *kssl_ctx) 1560 { 1561 if (kssl_ctx == NULL) return kssl_ctx; 1562 1563 if (kssl_ctx->key) OPENSSL_cleanse(kssl_ctx->key, 1564 kssl_ctx->length); 1565 if (kssl_ctx->key) free(kssl_ctx->key); 1566 if (kssl_ctx->client_princ) free(kssl_ctx->client_princ); 1567 if (kssl_ctx->service_host) free(kssl_ctx->service_host); 1568 if (kssl_ctx->service_name) free(kssl_ctx->service_name); 1569 if (kssl_ctx->keytab_file) free(kssl_ctx->keytab_file); 1570 1571 free(kssl_ctx); 1572 return (KSSL_CTX *) NULL; 1573 } 1574 1575 1576/* Given an array of (krb5_data *) entity (and optional realm), 1577** set the plain (char *) client_princ or service_host member 1578** of the kssl_ctx struct. 1579*/ 1580krb5_error_code 1581kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which, 1582 krb5_data *realm, krb5_data *entity, int nentities) 1583 { 1584 char **princ; 1585 int length; 1586 int i; 1587 1588 if (kssl_ctx == NULL || entity == NULL) return KSSL_CTX_ERR; 1589 1590 switch (which) 1591 { 1592 case KSSL_CLIENT: princ = &kssl_ctx->client_princ; break; 1593 case KSSL_SERVER: princ = &kssl_ctx->service_host; break; 1594 default: return KSSL_CTX_ERR; break; 1595 } 1596 if (*princ) free(*princ); 1597 1598 /* Add up all the entity->lengths */ 1599 length = 0; 1600 for (i=0; i < nentities; i++) 1601 { 1602 length += entity[i].length; 1603 } 1604 /* Add in space for the '/' character(s) (if any) */ 1605 length += nentities-1; 1606 /* Space for the ('@'+realm+NULL | NULL) */ 1607 length += ((realm)? realm->length + 2: 1); 1608 1609 if ((*princ = calloc(1, length)) == NULL) 1610 return KSSL_CTX_ERR; 1611 else 1612 { 1613 for (i = 0; i < nentities; i++) 1614 { 1615 strncat(*princ, entity[i].data, entity[i].length); 1616 if (i < nentities-1) 1617 { 1618 strcat (*princ, "/"); 1619 } 1620 } 1621 if (realm) 1622 { 1623 strcat (*princ, "@"); 1624 (void) strncat(*princ, realm->data, realm->length); 1625 } 1626 } 1627 1628 return KSSL_CTX_OK; 1629 } 1630 1631 1632/* Set one of the plain (char *) string members of the kssl_ctx struct. 1633** Default values should be: 1634** which == KSSL_SERVICE => "khost" (KRB5SVC) 1635** which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB) 1636*/ 1637krb5_error_code 1638kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text) 1639 { 1640 char **string; 1641 1642 if (!kssl_ctx) return KSSL_CTX_ERR; 1643 1644 switch (which) 1645 { 1646 case KSSL_SERVICE: string = &kssl_ctx->service_name; break; 1647 case KSSL_SERVER: string = &kssl_ctx->service_host; break; 1648 case KSSL_CLIENT: string = &kssl_ctx->client_princ; break; 1649 case KSSL_KEYTAB: string = &kssl_ctx->keytab_file; break; 1650 default: return KSSL_CTX_ERR; break; 1651 } 1652 if (*string) free(*string); 1653 1654 if (!text) 1655 { 1656 *string = '\0'; 1657 return KSSL_CTX_OK; 1658 } 1659 1660 if ((*string = calloc(1, strlen(text) + 1)) == NULL) 1661 return KSSL_CTX_ERR; 1662 else 1663 strcpy(*string, text); 1664 1665 return KSSL_CTX_OK; 1666 } 1667 1668 1669/* Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx 1670** struct. Clear kssl_ctx->key if Kerberos session key is NULL. 1671*/ 1672krb5_error_code 1673kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session) 1674 { 1675 int length; 1676 krb5_enctype enctype; 1677 krb5_octet FAR *contents = NULL; 1678 1679 if (!kssl_ctx) return KSSL_CTX_ERR; 1680 1681 if (kssl_ctx->key) 1682 { 1683 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length); 1684 free(kssl_ctx->key); 1685 } 1686 1687 if (session) 1688 { 1689 1690#ifdef KRB5_HEIMDAL 1691 length = session->keyvalue->length; 1692 enctype = session->keytype; 1693 contents = session->keyvalue->contents; 1694#else 1695 length = session->length; 1696 enctype = session->enctype; 1697 contents = session->contents; 1698#endif 1699 kssl_ctx->enctype = enctype; 1700 kssl_ctx->length = length; 1701 } 1702 else 1703 { 1704 kssl_ctx->enctype = ENCTYPE_UNKNOWN; 1705 kssl_ctx->length = 0; 1706 return KSSL_CTX_OK; 1707 } 1708 1709 if ((kssl_ctx->key = 1710 (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL) 1711 { 1712 kssl_ctx->length = 0; 1713 return KSSL_CTX_ERR; 1714 } 1715 else 1716 memcpy(kssl_ctx->key, contents, length); 1717 1718 return KSSL_CTX_OK; 1719 } 1720 1721 1722/* Display contents of kssl_ctx struct 1723*/ 1724void 1725kssl_ctx_show(KSSL_CTX *kssl_ctx) 1726 { 1727 int i; 1728 1729 printf("kssl_ctx: "); 1730 if (kssl_ctx == NULL) 1731 { 1732 printf("NULL\n"); 1733 return; 1734 } 1735 else 1736 printf("%p\n", (void *)kssl_ctx); 1737 1738 printf("\tservice:\t%s\n", 1739 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL"); 1740 printf("\tclient:\t%s\n", 1741 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL"); 1742 printf("\tserver:\t%s\n", 1743 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL"); 1744 printf("\tkeytab:\t%s\n", 1745 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL"); 1746 printf("\tkey [%d:%d]:\t", 1747 kssl_ctx->enctype, kssl_ctx->length); 1748 1749 for (i=0; i < kssl_ctx->length && kssl_ctx->key; i++) 1750 { 1751 printf("%02x", kssl_ctx->key[i]); 1752 } 1753 printf("\n"); 1754 return; 1755 } 1756 1757 int 1758 kssl_keytab_is_available(KSSL_CTX *kssl_ctx) 1759{ 1760 krb5_context krb5context = NULL; 1761 krb5_keytab krb5keytab = NULL; 1762 krb5_keytab_entry entry; 1763 krb5_principal princ = NULL; 1764 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1765 int rc = 0; 1766 1767 if ((krb5rc = krb5_init_context(&krb5context))) 1768 return(0); 1769 1770 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default 1771 */ 1772 if (kssl_ctx->keytab_file) 1773 { 1774 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1775 &krb5keytab); 1776 if (krb5rc) 1777 goto exit; 1778 } 1779 else 1780 { 1781 krb5rc = krb5_kt_default(krb5context,&krb5keytab); 1782 if (krb5rc) 1783 goto exit; 1784 } 1785 1786 /* the host key we are looking for */ 1787 krb5rc = krb5_sname_to_principal(krb5context, NULL, 1788 kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC, 1789 KRB5_NT_SRV_HST, &princ); 1790 1791 krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1792 princ, 1793 0 /* IGNORE_VNO */, 1794 0 /* IGNORE_ENCTYPE */, 1795 &entry); 1796 if ( krb5rc == KRB5_KT_NOTFOUND ) { 1797 rc = 1; 1798 goto exit; 1799 } else if ( krb5rc ) 1800 goto exit; 1801 1802 krb5_kt_free_entry(krb5context, &entry); 1803 rc = 1; 1804 1805 exit: 1806 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab); 1807 if (princ) krb5_free_principal(krb5context, princ); 1808 if (krb5context) krb5_free_context(krb5context); 1809 return(rc); 1810} 1811 1812int 1813kssl_tgt_is_available(KSSL_CTX *kssl_ctx) 1814 { 1815 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1816 krb5_context krb5context = NULL; 1817 krb5_ccache krb5ccdef = NULL; 1818 krb5_creds krb5creds, *krb5credsp = NULL; 1819 int rc = 0; 1820 1821 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1822 1823 if (!kssl_ctx) 1824 return(0); 1825 1826 if (!kssl_ctx->service_host) 1827 return(0); 1828 1829 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1830 goto err; 1831 1832 if ((krb5rc = krb5_sname_to_principal(krb5context, 1833 kssl_ctx->service_host, 1834 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1835 KRB5_NT_SRV_HST, &krb5creds.server)) != 0) 1836 goto err; 1837 1838 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1839 goto err; 1840 1841 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1842 &krb5creds.client)) != 0) 1843 goto err; 1844 1845 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1846 &krb5creds, &krb5credsp)) != 0) 1847 goto err; 1848 1849 rc = 1; 1850 1851 err: 1852#ifdef KSSL_DEBUG 1853 kssl_ctx_show(kssl_ctx); 1854#endif /* KSSL_DEBUG */ 1855 1856 if (krb5creds.client) krb5_free_principal(krb5context, krb5creds.client); 1857 if (krb5creds.server) krb5_free_principal(krb5context, krb5creds.server); 1858 if (krb5context) krb5_free_context(krb5context); 1859 return(rc); 1860 } 1861 1862#if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32) 1863void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data) 1864 { 1865#ifdef KRB5_HEIMDAL 1866 data->length = 0; 1867 if (data->data) 1868 free(data->data); 1869#elif defined(KRB5_MIT_OLD11) 1870 if (data->data) { 1871 krb5_xfree(data->data); 1872 data->data = 0; 1873 } 1874#else 1875 krb5_free_data_contents(NULL, data); 1876#endif 1877 } 1878#endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */ 1879 1880 1881/* Given pointers to KerberosTime and struct tm structs, convert the 1882** KerberosTime string to struct tm. Note that KerberosTime is a 1883** ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional 1884** seconds as defined in RFC 1510. 1885** Return pointer to the (partially) filled in struct tm on success, 1886** return NULL on failure. 1887*/ 1888struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm) 1889 { 1890 char c, *p; 1891 1892 if (!k_tm) return NULL; 1893 if (gtime == NULL || gtime->length < 14) return NULL; 1894 if (gtime->data == NULL) return NULL; 1895 1896 p = (char *)>ime->data[14]; 1897 1898 c = *p; *p = '\0'; p -= 2; k_tm->tm_sec = atoi(p); *(p+2) = c; 1899 c = *p; *p = '\0'; p -= 2; k_tm->tm_min = atoi(p); *(p+2) = c; 1900 c = *p; *p = '\0'; p -= 2; k_tm->tm_hour = atoi(p); *(p+2) = c; 1901 c = *p; *p = '\0'; p -= 2; k_tm->tm_mday = atoi(p); *(p+2) = c; 1902 c = *p; *p = '\0'; p -= 2; k_tm->tm_mon = atoi(p)-1; *(p+2) = c; 1903 c = *p; *p = '\0'; p -= 4; k_tm->tm_year = atoi(p)-1900; *(p+4) = c; 1904 1905 return k_tm; 1906 } 1907 1908 1909/* Helper function for kssl_validate_times(). 1910** We need context->clockskew, but krb5_context is an opaque struct. 1911** So we try to sneek the clockskew out through the replay cache. 1912** If that fails just return a likely default (300 seconds). 1913*/ 1914krb5_deltat get_rc_clockskew(krb5_context context) 1915 { 1916 krb5_rcache rc; 1917 krb5_deltat clockskew; 1918 1919 if (krb5_rc_default(context, &rc)) return KSSL_CLOCKSKEW; 1920 if (krb5_rc_initialize(context, rc, 0)) return KSSL_CLOCKSKEW; 1921 if (krb5_rc_get_lifespan(context, rc, &clockskew)) { 1922 clockskew = KSSL_CLOCKSKEW; 1923 } 1924 (void) krb5_rc_destroy(context, rc); 1925 return clockskew; 1926 } 1927 1928 1929/* kssl_validate_times() combines (and more importantly exposes) 1930** the MIT KRB5 internal function krb5_validate_times() and the 1931** in_clock_skew() macro. The authenticator client time is checked 1932** to be within clockskew secs of the current time and the current 1933** time is checked to be within the ticket start and expire times. 1934** Either check may be omitted by supplying a NULL value. 1935** Returns 0 for valid times, SSL_R_KRB5* error codes otherwise. 1936** See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c 1937** 20010420 VRS 1938*/ 1939krb5_error_code kssl_validate_times( krb5_timestamp atime, 1940 krb5_ticket_times *ttimes) 1941 { 1942 krb5_deltat skew; 1943 krb5_timestamp start, now; 1944 krb5_error_code rc; 1945 krb5_context context; 1946 1947 if ((rc = krb5_init_context(&context))) return SSL_R_KRB5_S_BAD_TICKET; 1948 skew = get_rc_clockskew(context); 1949 if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET; 1950 krb5_free_context(context); 1951 1952 if (atime && labs(atime - now) >= skew) return SSL_R_KRB5_S_TKT_SKEW; 1953 1954 if (! ttimes) return 0; 1955 1956 start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime; 1957 if (start - now > skew) return SSL_R_KRB5_S_TKT_NYV; 1958 if ((now - ttimes->endtime) > skew) return SSL_R_KRB5_S_TKT_EXPIRED; 1959 1960#ifdef KSSL_DEBUG 1961 printf("kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n", 1962 start, atime, now, skew, ttimes->endtime); 1963#endif /* KSSL_DEBUG */ 1964 1965 return 0; 1966 } 1967 1968 1969/* Decode and decrypt given DER-encoded authenticator, then pass 1970** authenticator ctime back in *atimep (or 0 if time unavailable). 1971** Returns krb5_error_code and kssl_err on error. A NULL 1972** authenticator (authentp->length == 0) is not considered an error. 1973** Note that kssl_check_authent() makes use of the KRB5 session key; 1974** you must call kssl_sget_tkt() to get the key before calling this routine. 1975*/ 1976krb5_error_code kssl_check_authent( 1977 /* IN */ KSSL_CTX *kssl_ctx, 1978 /* IN */ krb5_data *authentp, 1979 /* OUT */ krb5_timestamp *atimep, 1980 /* OUT */ KSSL_ERR *kssl_err ) 1981 { 1982 krb5_error_code krb5rc = 0; 1983 KRB5_ENCDATA *dec_authent = NULL; 1984 KRB5_AUTHENTBODY *auth = NULL; 1985 krb5_enctype enctype; 1986 EVP_CIPHER_CTX ciph_ctx; 1987 const EVP_CIPHER *enc = NULL; 1988 unsigned char iv[EVP_MAX_IV_LENGTH]; 1989 const unsigned char *p; 1990 unsigned char *unenc_authent; 1991 int outl, unencbufsize; 1992 struct tm tm_time, *tm_l, *tm_g; 1993 time_t now, tl, tg, tr, tz_offset; 1994 1995 EVP_CIPHER_CTX_init(&ciph_ctx); 1996 *atimep = 0; 1997 kssl_err_set(kssl_err, 0, ""); 1998 1999#ifndef KRB5CHECKAUTH 2000 authentp = NULL; 2001#else 2002#if KRB5CHECKAUTH == 0 2003 authentp = NULL; 2004#endif 2005#endif /* KRB5CHECKAUTH */ 2006 2007 if (authentp == NULL || authentp->length == 0) return 0; 2008 2009#ifdef KSSL_DEBUG 2010 { 2011 unsigned int ui; 2012 printf("kssl_check_authent: authenticator[%d]:\n",authentp->length); 2013 p = authentp->data; 2014 for (ui=0; ui < authentp->length; ui++) printf("%02x ",p[ui]); 2015 printf("\n"); 2016 } 2017#endif /* KSSL_DEBUG */ 2018 2019 unencbufsize = 2 * authentp->length; 2020 if ((unenc_authent = calloc(1, unencbufsize)) == NULL) 2021 { 2022 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2023 "Unable to allocate authenticator buffer.\n"); 2024 krb5rc = KRB5KRB_ERR_GENERIC; 2025 goto err; 2026 } 2027 2028 p = (unsigned char *)authentp->data; 2029 if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p, 2030 (long) authentp->length)) == NULL) 2031 { 2032 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2033 "Error decoding authenticator.\n"); 2034 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2035 goto err; 2036 } 2037 2038 enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */ 2039#if !defined(KRB5_MIT_OLD11) 2040 switch ( enctype ) { 2041 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 2042 case ENCTYPE_DES3_CBC_SHA: 2043 case ENCTYPE_DES3_CBC_RAW: 2044 krb5rc = 0; /* Skip, can't handle derived keys */ 2045 goto err; 2046 } 2047#endif 2048 enc = kssl_map_enc(enctype); 2049 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2050 2051 if (enc == NULL) 2052 { 2053 /* Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1. 2054 ** This enctype indicates the authenticator was encrypted 2055 ** using key-usage derived keys which openssl cannot decrypt. 2056 */ 2057 goto err; 2058 } 2059 2060 if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0)) 2061 { 2062 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2063 "EVP_CipherInit error decrypting authenticator.\n"); 2064 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2065 goto err; 2066 } 2067 outl = dec_authent->cipher->length; 2068 if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl)) 2069 { 2070 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2071 "EVP_Cipher error decrypting authenticator.\n"); 2072 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2073 goto err; 2074 } 2075 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2076 2077#ifdef KSSL_DEBUG 2078 printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl); 2079 for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]); 2080 printf("\n"); 2081#endif /* KSSL_DEBUG */ 2082 2083 if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL) 2084 { 2085 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2086 "confounded by authenticator.\n"); 2087 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2088 goto err; 2089 } 2090 outl -= p - unenc_authent; 2091 2092 if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p, 2093 (long) outl))==NULL) 2094 { 2095 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2096 "Error decoding authenticator body.\n"); 2097 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2098 goto err; 2099 } 2100 2101 memset(&tm_time,0,sizeof(struct tm)); 2102 if (k_gmtime(auth->ctime, &tm_time) && 2103 ((tr = mktime(&tm_time)) != (time_t)(-1))) 2104 { 2105 now = time(&now); 2106 tm_l = localtime(&now); tl = mktime(tm_l); 2107 tm_g = gmtime(&now); tg = mktime(tm_g); 2108 tz_offset = tg - tl; 2109 2110 *atimep = tr - tz_offset; 2111 } 2112 2113#ifdef KSSL_DEBUG 2114 printf("kssl_check_authent: returns %d for client time ", *atimep); 2115 if (auth && auth->ctime && auth->ctime->length && auth->ctime->data) 2116 printf("%.*s\n", auth->ctime->length, auth->ctime->data); 2117 else printf("NULL\n"); 2118#endif /* KSSL_DEBUG */ 2119 2120 err: 2121 if (auth) KRB5_AUTHENT_free((KRB5_AUTHENT *) auth); 2122 if (dec_authent) KRB5_ENCDATA_free(dec_authent); 2123 if (unenc_authent) free(unenc_authent); 2124 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2125 return krb5rc; 2126 } 2127 2128 2129/* Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host), 2130** because I dont't know how to stub varargs. 2131** Returns krb5_error_code == ENOMEM on alloc error, otherwise 2132** passes back newly constructed principal, which should be freed by caller. 2133*/ 2134krb5_error_code kssl_build_principal_2( 2135 /* UPDATE */ krb5_context context, 2136 /* OUT */ krb5_principal *princ, 2137 /* IN */ int rlen, const char *realm, 2138 /* IN */ int slen, const char *svc, 2139 /* IN */ int hlen, const char *host) 2140 { 2141 krb5_data *p_data = NULL; 2142 krb5_principal new_p = NULL; 2143 char *new_r = NULL; 2144 2145 if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL || 2146 (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data))) 2147 == NULL) goto err; 2148 new_p->length = 2; 2149 new_p->data = p_data; 2150 2151 if ((new_r = calloc(1, rlen + 1)) == NULL) goto err; 2152 memcpy(new_r, realm, rlen); 2153 krb5_princ_set_realm_length(context, new_p, rlen); 2154 krb5_princ_set_realm_data(context, new_p, new_r); 2155 2156 if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) goto err; 2157 memcpy(new_p->data[0].data, svc, slen); 2158 new_p->data[0].length = slen; 2159 2160 if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) goto err; 2161 memcpy(new_p->data[1].data, host, hlen); 2162 new_p->data[1].length = hlen; 2163 2164 krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN; 2165 *princ = new_p; 2166 return 0; 2167 2168 err: 2169 if (new_p && new_p[0].data) free(new_p[0].data); 2170 if (new_p && new_p[1].data) free(new_p[1].data); 2171 if (new_p) free(new_p); 2172 if (new_r) free(new_r); 2173 return ENOMEM; 2174 } 2175 2176 2177#else /* !OPENSSL_NO_KRB5 */ 2178 2179#if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS) 2180static int dummy=(int)&dummy; 2181#endif 2182 2183#endif /* !OPENSSL_NO_KRB5 */ 2184 2185