kssl.c revision 194206
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 */ 786 787 788/* memory allocation functions for non-temporary storage 789 * (e.g. stuff that gets saved into the kssl context) */ 790static void* kssl_calloc(size_t nmemb, size_t size) 791{ 792 void* p; 793 794 p=OPENSSL_malloc(nmemb*size); 795 if (p){ 796 memset(p, 0, nmemb*size); 797 } 798 return p; 799} 800 801#define kssl_malloc(size) OPENSSL_malloc((size)) 802#define kssl_realloc(ptr, size) OPENSSL_realloc(ptr, size) 803#define kssl_free(ptr) OPENSSL_free((ptr)) 804 805 806char 807*kstring(char *string) 808 { 809 static char *null = "[NULL]"; 810 811 return ((string == NULL)? null: string); 812 } 813 814/* Given KRB5 enctype (basically DES or 3DES), 815** return closest match openssl EVP_ encryption algorithm. 816** Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes. 817** Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK. 818*/ 819const EVP_CIPHER * 820kssl_map_enc(krb5_enctype enctype) 821 { 822 switch (enctype) 823 { 824 case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */ 825 case ENCTYPE_DES_CBC_CRC: 826 case ENCTYPE_DES_CBC_MD4: 827 case ENCTYPE_DES_CBC_MD5: 828 case ENCTYPE_DES_CBC_RAW: 829 return EVP_des_cbc(); 830 break; 831 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 832 case ENCTYPE_DES3_CBC_SHA: 833 case ENCTYPE_DES3_CBC_RAW: 834 return EVP_des_ede3_cbc(); 835 break; 836 default: return NULL; 837 break; 838 } 839 } 840 841 842/* Return true:1 if p "looks like" the start of the real authenticator 843** described in kssl_skip_confound() below. The ASN.1 pattern is 844** "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and 845** xx and yy are possibly multi-byte length fields. 846*/ 847int kssl_test_confound(unsigned char *p) 848 { 849 int len = 2; 850 int xx = 0, yy = 0; 851 852 if (*p++ != 0x62) return 0; 853 if (*p > 0x82) return 0; 854 switch(*p) { 855 case 0x82: p++; xx = (*p++ << 8); xx += *p++; break; 856 case 0x81: p++; xx = *p++; break; 857 case 0x80: return 0; 858 default: xx = *p++; break; 859 } 860 if (*p++ != 0x30) return 0; 861 if (*p > 0x82) return 0; 862 switch(*p) { 863 case 0x82: p++; len+=2; yy = (*p++ << 8); yy += *p++; break; 864 case 0x81: p++; len++; yy = *p++; break; 865 case 0x80: return 0; 866 default: yy = *p++; break; 867 } 868 869 return (xx - len == yy)? 1: 0; 870 } 871 872/* Allocate, fill, and return cksumlens array of checksum lengths. 873** This array holds just the unique elements from the krb5_cksumarray[]. 874** array[n] == 0 signals end of data. 875** 876** The krb5_cksumarray[] was an internal variable that has since been 877** replaced by a more general method for storing the data. It should 878** not be used. Instead we use real API calls and make a guess for 879** what the highest assigned CKSUMTYPE_ constant is. As of 1.2.2 880** it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3). So we will use 0x0010. 881*/ 882size_t *populate_cksumlens(void) 883 { 884 int i, j, n; 885 static size_t *cklens = NULL; 886 887#ifdef KRB5_MIT_OLD11 888 n = krb5_max_cksum; 889#else 890 n = 0x0010; 891#endif /* KRB5_MIT_OLD11 */ 892 893#ifdef KRB5CHECKAUTH 894 if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1))) return NULL; 895 896 for (i=0; i < n; i++) { 897 if (!valid_cksumtype(i)) continue; /* array has holes */ 898 for (j=0; j < n; j++) { 899 if (cklens[j] == 0) { 900 cklens[j] = krb5_checksum_size(NULL,i); 901 break; /* krb5 elem was new: add */ 902 } 903 if (cklens[j] == krb5_checksum_size(NULL,i)) { 904 break; /* ignore duplicate elements */ 905 } 906 } 907 } 908#endif /* KRB5CHECKAUTH */ 909 910 return cklens; 911 } 912 913/* Return pointer to start of real authenticator within authenticator, or 914** return NULL on error. 915** Decrypted authenticator looks like this: 916** [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r] 917** This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the 918** krb5_auth_con_getcksumtype() function advertised in its krb5.h. 919*/ 920unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a) 921 { 922 int i, conlen; 923 size_t cklen; 924 static size_t *cksumlens = NULL; 925 unsigned char *test_auth; 926 927 conlen = (etype)? 8: 0; 928 929 if (!cksumlens && !(cksumlens = populate_cksumlens())) return NULL; 930 for (i=0; (cklen = cksumlens[i]) != 0; i++) 931 { 932 test_auth = a + conlen + cklen; 933 if (kssl_test_confound(test_auth)) return test_auth; 934 } 935 936 return NULL; 937 } 938 939 940/* Set kssl_err error info when reason text is a simple string 941** kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; } 942*/ 943void 944kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text) 945 { 946 if (kssl_err == NULL) return; 947 948 kssl_err->reason = reason; 949 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "%s", text); 950 return; 951 } 952 953 954/* Display contents of krb5_data struct, for debugging 955*/ 956void 957print_krb5_data(char *label, krb5_data *kdata) 958 { 959 int i; 960 961 printf("%s[%d] ", label, kdata->length); 962 for (i=0; i < (int)kdata->length; i++) 963 { 964 if (0 && isprint((int) kdata->data[i])) 965 printf( "%c ", kdata->data[i]); 966 else 967 printf( "%02x ", (unsigned char) kdata->data[i]); 968 } 969 printf("\n"); 970 } 971 972 973/* Display contents of krb5_authdata struct, for debugging 974*/ 975void 976print_krb5_authdata(char *label, krb5_authdata **adata) 977 { 978 if (adata == NULL) 979 { 980 printf("%s, authdata==0\n", label); 981 return; 982 } 983 printf("%s [%p]\n", label, (void *)adata); 984#if 0 985 { 986 int i; 987 printf("%s[at%d:%d] ", label, adata->ad_type, adata->length); 988 for (i=0; i < adata->length; i++) 989 { 990 printf((isprint(adata->contents[i]))? "%c ": "%02x", 991 adata->contents[i]); 992 } 993 printf("\n"); 994 } 995#endif 996 } 997 998 999/* Display contents of krb5_keyblock struct, for debugging 1000*/ 1001void 1002print_krb5_keyblock(char *label, krb5_keyblock *keyblk) 1003 { 1004 int i; 1005 1006 if (keyblk == NULL) 1007 { 1008 printf("%s, keyblk==0\n", label); 1009 return; 1010 } 1011#ifdef KRB5_HEIMDAL 1012 printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype, 1013 keyblk->keyvalue->length); 1014 for (i=0; i < (int)keyblk->keyvalue->length; i++) 1015 { 1016 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]); 1017 } 1018 printf("\n"); 1019#else 1020 printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length); 1021 for (i=0; i < (int)keyblk->length; i++) 1022 { 1023 printf("%02x",keyblk->contents[i]); 1024 } 1025 printf("\n"); 1026#endif 1027 } 1028 1029 1030/* Display contents of krb5_principal_data struct, for debugging 1031** (krb5_principal is typedef'd == krb5_principal_data *) 1032*/ 1033void 1034print_krb5_princ(char *label, krb5_principal_data *princ) 1035 { 1036 int i, ui, uj; 1037 1038 printf("%s principal Realm: ", label); 1039 if (princ == NULL) return; 1040 for (ui=0; ui < (int)princ->realm.length; ui++) putchar(princ->realm.data[ui]); 1041 printf(" (nametype %d) has %d strings:\n", princ->type,princ->length); 1042 for (i=0; i < (int)princ->length; i++) 1043 { 1044 printf("\t%d [%d]: ", i, princ->data[i].length); 1045 for (uj=0; uj < (int)princ->data[i].length; uj++) { 1046 putchar(princ->data[i].data[uj]); 1047 } 1048 printf("\n"); 1049 } 1050 return; 1051 } 1052 1053 1054/* Given krb5 service (typically "kssl") and hostname in kssl_ctx, 1055** Return encrypted Kerberos ticket for service @ hostname. 1056** If authenp is non-NULL, also return encrypted authenticator, 1057** whose data should be freed by caller. 1058** (Originally was: Create Kerberos AP_REQ message for SSL Client.) 1059** 1060** 19990628 VRS Started; Returns Kerberos AP_REQ message. 1061** 20010409 VRS Modified for RFC2712; Returns enc tkt. 1062** 20010606 VRS May also return optional authenticator. 1063*/ 1064krb5_error_code 1065kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1066 /* OUT */ krb5_data **enc_ticketp, 1067 /* UPDATE */ krb5_data *authenp, 1068 /* OUT */ KSSL_ERR *kssl_err) 1069 { 1070 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1071 krb5_context krb5context = NULL; 1072 krb5_auth_context krb5auth_context = NULL; 1073 krb5_ccache krb5ccdef = NULL; 1074 krb5_creds krb5creds, *krb5credsp = NULL; 1075 krb5_data krb5_app_req; 1076 1077 kssl_err_set(kssl_err, 0, ""); 1078 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1079 1080 if (!kssl_ctx) 1081 { 1082 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1083 "No kssl_ctx defined.\n"); 1084 goto err; 1085 } 1086 else if (!kssl_ctx->service_host) 1087 { 1088 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1089 "kssl_ctx service_host undefined.\n"); 1090 goto err; 1091 } 1092 1093 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1094 { 1095 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, 1096 "krb5_init_context() fails: %d\n", krb5rc); 1097 kssl_err->reason = SSL_R_KRB5_C_INIT; 1098 goto err; 1099 } 1100 1101 if ((krb5rc = krb5_sname_to_principal(krb5context, 1102 kssl_ctx->service_host, 1103 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1104 KRB5_NT_SRV_HST, &krb5creds.server)) != 0) 1105 { 1106 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX, 1107 "krb5_sname_to_principal() fails for %s/%s\n", 1108 kssl_ctx->service_host, 1109 (kssl_ctx->service_name)? kssl_ctx->service_name: 1110 KRB5SVC); 1111 kssl_err->reason = SSL_R_KRB5_C_INIT; 1112 goto err; 1113 } 1114 1115 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1116 { 1117 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1118 "krb5_cc_default fails.\n"); 1119 goto err; 1120 } 1121 1122 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1123 &krb5creds.client)) != 0) 1124 { 1125 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1126 "krb5_cc_get_principal() fails.\n"); 1127 goto err; 1128 } 1129 1130 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1131 &krb5creds, &krb5credsp)) != 0) 1132 { 1133 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED, 1134 "krb5_get_credentials() fails.\n"); 1135 goto err; 1136 } 1137 1138 *enc_ticketp = &krb5credsp->ticket; 1139#ifdef KRB5_HEIMDAL 1140 kssl_ctx->enctype = krb5credsp->session.keytype; 1141#else 1142 kssl_ctx->enctype = krb5credsp->keyblock.enctype; 1143#endif 1144 1145 krb5rc = KRB5KRB_ERR_GENERIC; 1146 /* caller should free data of krb5_app_req */ 1147 /* 20010406 VRS deleted for real KerberosWrapper 1148 ** 20010605 VRS reinstated to offer Authenticator to KerberosWrapper 1149 */ 1150 krb5_app_req.length = 0; 1151 if (authenp) 1152 { 1153 krb5_data krb5in_data; 1154 const unsigned char *p; 1155 long arlen; 1156 KRB5_APREQBODY *ap_req; 1157 1158 authenp->length = 0; 1159 krb5in_data.data = NULL; 1160 krb5in_data.length = 0; 1161 if ((krb5rc = krb5_mk_req_extended(krb5context, 1162 &krb5auth_context, 0, &krb5in_data, krb5credsp, 1163 &krb5_app_req)) != 0) 1164 { 1165 kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ, 1166 "krb5_mk_req_extended() fails.\n"); 1167 goto err; 1168 } 1169 1170 arlen = krb5_app_req.length; 1171 p = (unsigned char *)krb5_app_req.data; 1172 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen); 1173 if (ap_req) 1174 { 1175 authenp->length = i2d_KRB5_ENCDATA( 1176 ap_req->authenticator, NULL); 1177 if (authenp->length && 1178 (authenp->data = malloc(authenp->length))) 1179 { 1180 unsigned char *adp = (unsigned char *)authenp->data; 1181 authenp->length = i2d_KRB5_ENCDATA( 1182 ap_req->authenticator, &adp); 1183 } 1184 } 1185 1186 if (ap_req) KRB5_APREQ_free((KRB5_APREQ *) ap_req); 1187 if (krb5_app_req.length) 1188 kssl_krb5_free_data_contents(krb5context,&krb5_app_req); 1189 } 1190#ifdef KRB5_HEIMDAL 1191 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session)) 1192 { 1193 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1194 "kssl_ctx_setkey() fails.\n"); 1195 } 1196#else 1197 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock)) 1198 { 1199 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1200 "kssl_ctx_setkey() fails.\n"); 1201 } 1202#endif 1203 else krb5rc = 0; 1204 1205 err: 1206#ifdef KSSL_DEBUG 1207 kssl_ctx_show(kssl_ctx); 1208#endif /* KSSL_DEBUG */ 1209 1210 if (krb5creds.client) krb5_free_principal(krb5context, 1211 krb5creds.client); 1212 if (krb5creds.server) krb5_free_principal(krb5context, 1213 krb5creds.server); 1214 if (krb5auth_context) krb5_auth_con_free(krb5context, 1215 krb5auth_context); 1216 if (krb5context) krb5_free_context(krb5context); 1217 return (krb5rc); 1218 } 1219 1220 1221/* Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket. 1222** Return Kerberos error code and kssl_err struct on error. 1223** Allocates krb5_ticket and krb5_principal; caller should free these. 1224** 1225** 20010410 VRS Implemented krb5_decode_ticket() as 1226** old_krb5_decode_ticket(). Missing from MIT1.0.6. 1227** 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions. 1228** Re-used some of the old krb5_decode_ticket() 1229** code here. This tkt should alloc/free just 1230** like the real thing. 1231*/ 1232krb5_error_code 1233kssl_TKT2tkt( /* IN */ krb5_context krb5context, 1234 /* IN */ KRB5_TKTBODY *asn1ticket, 1235 /* OUT */ krb5_ticket **krb5ticket, 1236 /* OUT */ KSSL_ERR *kssl_err ) 1237 { 1238 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1239 krb5_ticket *new5ticket = NULL; 1240 ASN1_GENERALSTRING *gstr_svc, *gstr_host; 1241 1242 *krb5ticket = NULL; 1243 1244 if (asn1ticket == NULL || asn1ticket->realm == NULL || 1245 asn1ticket->sname == NULL || 1246 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2) 1247 { 1248 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1249 "Null field in asn1ticket.\n"); 1250 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1251 return KRB5KRB_ERR_GENERIC; 1252 } 1253 1254 if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL) 1255 { 1256 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1257 "Unable to allocate new krb5_ticket.\n"); 1258 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1259 return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */ 1260 } 1261 1262 gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0); 1263 gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1); 1264 1265 if ((krb5rc = kssl_build_principal_2(krb5context, 1266 &new5ticket->server, 1267 asn1ticket->realm->length, (char *)asn1ticket->realm->data, 1268 gstr_svc->length, (char *)gstr_svc->data, 1269 gstr_host->length, (char *)gstr_host->data)) != 0) 1270 { 1271 free(new5ticket); 1272 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1273 "Error building ticket server principal.\n"); 1274 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1275 return krb5rc; /* or KRB5KRB_ERR_GENERIC; */ 1276 } 1277 1278 krb5_princ_type(krb5context, new5ticket->server) = 1279 asn1ticket->sname->nametype->data[0]; 1280 new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0]; 1281 new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0]; 1282 new5ticket->enc_part.ciphertext.length = 1283 asn1ticket->encdata->cipher->length; 1284 if ((new5ticket->enc_part.ciphertext.data = 1285 calloc(1, asn1ticket->encdata->cipher->length)) == NULL) 1286 { 1287 free(new5ticket); 1288 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1289 "Error allocating cipher in krb5ticket.\n"); 1290 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1291 return KRB5KRB_ERR_GENERIC; 1292 } 1293 else 1294 { 1295 memcpy(new5ticket->enc_part.ciphertext.data, 1296 asn1ticket->encdata->cipher->data, 1297 asn1ticket->encdata->cipher->length); 1298 } 1299 1300 *krb5ticket = new5ticket; 1301 return 0; 1302 } 1303 1304 1305/* Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"), 1306** and krb5 AP_REQ message & message length, 1307** Return Kerberos session key and client principle 1308** to SSL Server in KSSL_CTX *kssl_ctx. 1309** 1310** 19990702 VRS Started. 1311*/ 1312krb5_error_code 1313kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1314 /* IN */ krb5_data *indata, 1315 /* OUT */ krb5_ticket_times *ttimes, 1316 /* OUT */ KSSL_ERR *kssl_err ) 1317 { 1318 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1319 static krb5_context krb5context = NULL; 1320 static krb5_auth_context krb5auth_context = NULL; 1321 krb5_ticket *krb5ticket = NULL; 1322 KRB5_TKTBODY *asn1ticket = NULL; 1323 const unsigned char *p; 1324 krb5_keytab krb5keytab = NULL; 1325 krb5_keytab_entry kt_entry; 1326 krb5_principal krb5server; 1327 krb5_rcache rcache = NULL; 1328 1329 kssl_err_set(kssl_err, 0, ""); 1330 1331 if (!kssl_ctx) 1332 { 1333 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1334 "No kssl_ctx defined.\n"); 1335 goto err; 1336 } 1337 1338#ifdef KSSL_DEBUG 1339 printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name)); 1340#endif /* KSSL_DEBUG */ 1341 1342 if (!krb5context && (krb5rc = krb5_init_context(&krb5context))) 1343 { 1344 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1345 "krb5_init_context() fails.\n"); 1346 goto err; 1347 } 1348 if (krb5auth_context && 1349 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context))) 1350 { 1351 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1352 "krb5_auth_con_free() fails.\n"); 1353 goto err; 1354 } 1355 else krb5auth_context = NULL; 1356 if (!krb5auth_context && 1357 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context))) 1358 { 1359 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1360 "krb5_auth_con_init() fails.\n"); 1361 goto err; 1362 } 1363 1364 1365 if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context, 1366 &rcache))) 1367 { 1368 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1369 "krb5_auth_con_getrcache() fails.\n"); 1370 goto err; 1371 } 1372 1373 if ((krb5rc = krb5_sname_to_principal(krb5context, NULL, 1374 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1375 KRB5_NT_SRV_HST, &krb5server)) != 0) 1376 { 1377 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1378 "krb5_sname_to_principal() fails.\n"); 1379 goto err; 1380 } 1381 1382 if (rcache == NULL) 1383 { 1384 if ((krb5rc = krb5_get_server_rcache(krb5context, 1385 krb5_princ_component(krb5context, krb5server, 0), 1386 &rcache))) 1387 { 1388 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1389 "krb5_get_server_rcache() fails.\n"); 1390 goto err; 1391 } 1392 } 1393 1394 if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache))) 1395 { 1396 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1397 "krb5_auth_con_setrcache() fails.\n"); 1398 goto err; 1399 } 1400 1401 1402 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default 1403 */ 1404 if (kssl_ctx->keytab_file) 1405 { 1406 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1407 &krb5keytab); 1408 if (krb5rc) 1409 { 1410 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1411 "krb5_kt_resolve() fails.\n"); 1412 goto err; 1413 } 1414 } 1415 else 1416 { 1417 krb5rc = krb5_kt_default(krb5context,&krb5keytab); 1418 if (krb5rc) 1419 { 1420 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1421 "krb5_kt_default() fails.\n"); 1422 goto err; 1423 } 1424 } 1425 1426 /* Actual Kerberos5 krb5_recvauth() has initial conversation here 1427 ** o check KRB5_SENDAUTH_BADAUTHVERS 1428 ** unless KRB5_RECVAUTH_SKIP_VERSION 1429 ** o check KRB5_SENDAUTH_BADAPPLVERS 1430 ** o send "0" msg if all OK 1431 */ 1432 1433 /* 20010411 was using AP_REQ instead of true KerberosWrapper 1434 ** 1435 ** if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context, 1436 ** &krb5in_data, krb5server, krb5keytab, 1437 ** &ap_option, &krb5ticket)) != 0) { Error } 1438 */ 1439 1440 p = (unsigned char *)indata->data; 1441 if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p, 1442 (long) indata->length)) == NULL) 1443 { 1444 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1445 "d2i_KRB5_TICKET() ASN.1 decode failure.\n"); 1446 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1447 goto err; 1448 } 1449 1450 /* Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */ 1451 if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket, 1452 kssl_err)) != 0) 1453 { 1454 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1455 "Error converting ASN.1 ticket to krb5_ticket.\n"); 1456 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1457 goto err; 1458 } 1459 1460 if (! krb5_principal_compare(krb5context, krb5server, 1461 krb5ticket->server)) { 1462 krb5rc = KRB5_PRINC_NOMATCH; 1463 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1464 "server principal != ticket principal\n"); 1465 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1466 goto err; 1467 } 1468 if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1469 krb5ticket->server, krb5ticket->enc_part.kvno, 1470 krb5ticket->enc_part.enctype, &kt_entry)) != 0) { 1471 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1472 "krb5_kt_get_entry() fails with %x.\n", krb5rc); 1473 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1474 goto err; 1475 } 1476 if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key, 1477 krb5ticket)) != 0) { 1478 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1479 "krb5_decrypt_tkt_part() failed.\n"); 1480 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1481 goto err; 1482 } 1483 else { 1484 krb5_kt_free_entry(krb5context, &kt_entry); 1485#ifdef KSSL_DEBUG 1486 { 1487 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs; 1488 printf("Decrypted ticket fields:\n"); 1489 printf("\tflags: %X, transit-type: %X", 1490 krb5ticket->enc_part2->flags, 1491 krb5ticket->enc_part2->transited.tr_type); 1492 print_krb5_data("\ttransit-data: ", 1493 &(krb5ticket->enc_part2->transited.tr_contents)); 1494 printf("\tcaddrs: %p, authdata: %p\n", 1495 krb5ticket->enc_part2->caddrs, 1496 krb5ticket->enc_part2->authorization_data); 1497 if (paddr) 1498 { 1499 printf("\tcaddrs:\n"); 1500 for (i=0; paddr[i] != NULL; i++) 1501 { 1502 krb5_data d; 1503 d.length=paddr[i]->length; 1504 d.data=paddr[i]->contents; 1505 print_krb5_data("\t\tIP: ", &d); 1506 } 1507 } 1508 printf("\tstart/auth/end times: %d / %d / %d\n", 1509 krb5ticket->enc_part2->times.starttime, 1510 krb5ticket->enc_part2->times.authtime, 1511 krb5ticket->enc_part2->times.endtime); 1512 } 1513#endif /* KSSL_DEBUG */ 1514 } 1515 1516 krb5rc = KRB5_NO_TKT_SUPPLIED; 1517 if (!krb5ticket || !krb5ticket->enc_part2 || 1518 !krb5ticket->enc_part2->client || 1519 !krb5ticket->enc_part2->client->data || 1520 !krb5ticket->enc_part2->session) 1521 { 1522 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1523 "bad ticket from krb5_rd_req.\n"); 1524 } 1525 else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT, 1526 &krb5ticket->enc_part2->client->realm, 1527 krb5ticket->enc_part2->client->data, 1528 krb5ticket->enc_part2->client->length)) 1529 { 1530 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1531 "kssl_ctx_setprinc() fails.\n"); 1532 } 1533 else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session)) 1534 { 1535 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1536 "kssl_ctx_setkey() fails.\n"); 1537 } 1538 else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID) 1539 { 1540 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID; 1541 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1542 "invalid ticket from krb5_rd_req.\n"); 1543 } 1544 else krb5rc = 0; 1545 1546 kssl_ctx->enctype = krb5ticket->enc_part.enctype; 1547 ttimes->authtime = krb5ticket->enc_part2->times.authtime; 1548 ttimes->starttime = krb5ticket->enc_part2->times.starttime; 1549 ttimes->endtime = krb5ticket->enc_part2->times.endtime; 1550 ttimes->renew_till = krb5ticket->enc_part2->times.renew_till; 1551 1552 err: 1553#ifdef KSSL_DEBUG 1554 kssl_ctx_show(kssl_ctx); 1555#endif /* KSSL_DEBUG */ 1556 1557 if (asn1ticket) KRB5_TICKET_free((KRB5_TICKET *) asn1ticket); 1558 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab); 1559 if (krb5ticket) krb5_free_ticket(krb5context, krb5ticket); 1560 if (krb5server) krb5_free_principal(krb5context, krb5server); 1561 return (krb5rc); 1562 } 1563 1564 1565/* Allocate & return a new kssl_ctx struct. 1566*/ 1567KSSL_CTX * 1568kssl_ctx_new(void) 1569 { 1570 return ((KSSL_CTX *) kssl_calloc(1, sizeof(KSSL_CTX))); 1571 } 1572 1573 1574/* Frees a kssl_ctx struct and any allocated memory it holds. 1575** Returns NULL. 1576*/ 1577KSSL_CTX * 1578kssl_ctx_free(KSSL_CTX *kssl_ctx) 1579 { 1580 if (kssl_ctx == NULL) return kssl_ctx; 1581 1582 if (kssl_ctx->key) OPENSSL_cleanse(kssl_ctx->key, 1583 kssl_ctx->length); 1584 if (kssl_ctx->key) kssl_free(kssl_ctx->key); 1585 if (kssl_ctx->client_princ) kssl_free(kssl_ctx->client_princ); 1586 if (kssl_ctx->service_host) kssl_free(kssl_ctx->service_host); 1587 if (kssl_ctx->service_name) kssl_free(kssl_ctx->service_name); 1588 if (kssl_ctx->keytab_file) kssl_free(kssl_ctx->keytab_file); 1589 1590 kssl_free(kssl_ctx); 1591 return (KSSL_CTX *) NULL; 1592 } 1593 1594 1595/* Given an array of (krb5_data *) entity (and optional realm), 1596** set the plain (char *) client_princ or service_host member 1597** of the kssl_ctx struct. 1598*/ 1599krb5_error_code 1600kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which, 1601 krb5_data *realm, krb5_data *entity, int nentities) 1602 { 1603 char **princ; 1604 int length; 1605 int i; 1606 1607 if (kssl_ctx == NULL || entity == NULL) return KSSL_CTX_ERR; 1608 1609 switch (which) 1610 { 1611 case KSSL_CLIENT: princ = &kssl_ctx->client_princ; break; 1612 case KSSL_SERVER: princ = &kssl_ctx->service_host; break; 1613 default: return KSSL_CTX_ERR; break; 1614 } 1615 if (*princ) kssl_free(*princ); 1616 1617 /* Add up all the entity->lengths */ 1618 length = 0; 1619 for (i=0; i < nentities; i++) 1620 { 1621 length += entity[i].length; 1622 } 1623 /* Add in space for the '/' character(s) (if any) */ 1624 length += nentities-1; 1625 /* Space for the ('@'+realm+NULL | NULL) */ 1626 length += ((realm)? realm->length + 2: 1); 1627 1628 if ((*princ = kssl_calloc(1, length)) == NULL) 1629 return KSSL_CTX_ERR; 1630 else 1631 { 1632 for (i = 0; i < nentities; i++) 1633 { 1634 strncat(*princ, entity[i].data, entity[i].length); 1635 if (i < nentities-1) 1636 { 1637 strcat (*princ, "/"); 1638 } 1639 } 1640 if (realm) 1641 { 1642 strcat (*princ, "@"); 1643 (void) strncat(*princ, realm->data, realm->length); 1644 } 1645 } 1646 1647 return KSSL_CTX_OK; 1648 } 1649 1650 1651/* Set one of the plain (char *) string members of the kssl_ctx struct. 1652** Default values should be: 1653** which == KSSL_SERVICE => "khost" (KRB5SVC) 1654** which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB) 1655*/ 1656krb5_error_code 1657kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text) 1658 { 1659 char **string; 1660 1661 if (!kssl_ctx) return KSSL_CTX_ERR; 1662 1663 switch (which) 1664 { 1665 case KSSL_SERVICE: string = &kssl_ctx->service_name; break; 1666 case KSSL_SERVER: string = &kssl_ctx->service_host; break; 1667 case KSSL_CLIENT: string = &kssl_ctx->client_princ; break; 1668 case KSSL_KEYTAB: string = &kssl_ctx->keytab_file; break; 1669 default: return KSSL_CTX_ERR; break; 1670 } 1671 if (*string) kssl_free(*string); 1672 1673 if (!text) 1674 { 1675 *string = '\0'; 1676 return KSSL_CTX_OK; 1677 } 1678 1679 if ((*string = kssl_calloc(1, strlen(text) + 1)) == NULL) 1680 return KSSL_CTX_ERR; 1681 else 1682 strcpy(*string, text); 1683 1684 return KSSL_CTX_OK; 1685 } 1686 1687 1688/* Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx 1689** struct. Clear kssl_ctx->key if Kerberos session key is NULL. 1690*/ 1691krb5_error_code 1692kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session) 1693 { 1694 int length; 1695 krb5_enctype enctype; 1696 krb5_octet FAR *contents = NULL; 1697 1698 if (!kssl_ctx) return KSSL_CTX_ERR; 1699 1700 if (kssl_ctx->key) 1701 { 1702 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length); 1703 kssl_free(kssl_ctx->key); 1704 } 1705 1706 if (session) 1707 { 1708 1709#ifdef KRB5_HEIMDAL 1710 length = session->keyvalue->length; 1711 enctype = session->keytype; 1712 contents = session->keyvalue->contents; 1713#else 1714 length = session->length; 1715 enctype = session->enctype; 1716 contents = session->contents; 1717#endif 1718 kssl_ctx->enctype = enctype; 1719 kssl_ctx->length = length; 1720 } 1721 else 1722 { 1723 kssl_ctx->enctype = ENCTYPE_UNKNOWN; 1724 kssl_ctx->length = 0; 1725 return KSSL_CTX_OK; 1726 } 1727 1728 if ((kssl_ctx->key = 1729 (krb5_octet FAR *) kssl_calloc(1, kssl_ctx->length)) == NULL) 1730 { 1731 kssl_ctx->length = 0; 1732 return KSSL_CTX_ERR; 1733 } 1734 else 1735 memcpy(kssl_ctx->key, contents, length); 1736 1737 return KSSL_CTX_OK; 1738 } 1739 1740 1741/* Display contents of kssl_ctx struct 1742*/ 1743void 1744kssl_ctx_show(KSSL_CTX *kssl_ctx) 1745 { 1746 int i; 1747 1748 printf("kssl_ctx: "); 1749 if (kssl_ctx == NULL) 1750 { 1751 printf("NULL\n"); 1752 return; 1753 } 1754 else 1755 printf("%p\n", (void *)kssl_ctx); 1756 1757 printf("\tservice:\t%s\n", 1758 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL"); 1759 printf("\tclient:\t%s\n", 1760 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL"); 1761 printf("\tserver:\t%s\n", 1762 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL"); 1763 printf("\tkeytab:\t%s\n", 1764 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL"); 1765 printf("\tkey [%d:%d]:\t", 1766 kssl_ctx->enctype, kssl_ctx->length); 1767 1768 for (i=0; i < kssl_ctx->length && kssl_ctx->key; i++) 1769 { 1770 printf("%02x", kssl_ctx->key[i]); 1771 } 1772 printf("\n"); 1773 return; 1774 } 1775 1776 int 1777 kssl_keytab_is_available(KSSL_CTX *kssl_ctx) 1778{ 1779 krb5_context krb5context = NULL; 1780 krb5_keytab krb5keytab = NULL; 1781 krb5_keytab_entry entry; 1782 krb5_principal princ = NULL; 1783 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1784 int rc = 0; 1785 1786 if ((krb5rc = krb5_init_context(&krb5context))) 1787 return(0); 1788 1789 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default 1790 */ 1791 if (kssl_ctx->keytab_file) 1792 { 1793 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1794 &krb5keytab); 1795 if (krb5rc) 1796 goto exit; 1797 } 1798 else 1799 { 1800 krb5rc = krb5_kt_default(krb5context,&krb5keytab); 1801 if (krb5rc) 1802 goto exit; 1803 } 1804 1805 /* the host key we are looking for */ 1806 krb5rc = krb5_sname_to_principal(krb5context, NULL, 1807 kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC, 1808 KRB5_NT_SRV_HST, &princ); 1809 1810 krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1811 princ, 1812 0 /* IGNORE_VNO */, 1813 0 /* IGNORE_ENCTYPE */, 1814 &entry); 1815 if ( krb5rc == KRB5_KT_NOTFOUND ) { 1816 rc = 1; 1817 goto exit; 1818 } else if ( krb5rc ) 1819 goto exit; 1820 1821 krb5_kt_free_entry(krb5context, &entry); 1822 rc = 1; 1823 1824 exit: 1825 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab); 1826 if (princ) krb5_free_principal(krb5context, princ); 1827 if (krb5context) krb5_free_context(krb5context); 1828 return(rc); 1829} 1830 1831int 1832kssl_tgt_is_available(KSSL_CTX *kssl_ctx) 1833 { 1834 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1835 krb5_context krb5context = NULL; 1836 krb5_ccache krb5ccdef = NULL; 1837 krb5_creds krb5creds, *krb5credsp = NULL; 1838 int rc = 0; 1839 1840 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1841 1842 if (!kssl_ctx) 1843 return(0); 1844 1845 if (!kssl_ctx->service_host) 1846 return(0); 1847 1848 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1849 goto err; 1850 1851 if ((krb5rc = krb5_sname_to_principal(krb5context, 1852 kssl_ctx->service_host, 1853 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC, 1854 KRB5_NT_SRV_HST, &krb5creds.server)) != 0) 1855 goto err; 1856 1857 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1858 goto err; 1859 1860 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1861 &krb5creds.client)) != 0) 1862 goto err; 1863 1864 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1865 &krb5creds, &krb5credsp)) != 0) 1866 goto err; 1867 1868 rc = 1; 1869 1870 err: 1871#ifdef KSSL_DEBUG 1872 kssl_ctx_show(kssl_ctx); 1873#endif /* KSSL_DEBUG */ 1874 1875 if (krb5creds.client) krb5_free_principal(krb5context, krb5creds.client); 1876 if (krb5creds.server) krb5_free_principal(krb5context, krb5creds.server); 1877 if (krb5context) krb5_free_context(krb5context); 1878 return(rc); 1879 } 1880 1881#if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32) 1882void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data) 1883 { 1884#ifdef KRB5_HEIMDAL 1885 data->length = 0; 1886 if (data->data) 1887 free(data->data); 1888#elif defined(KRB5_MIT_OLD11) 1889 if (data->data) { 1890 krb5_xfree(data->data); 1891 data->data = 0; 1892 } 1893#else 1894 krb5_free_data_contents(NULL, data); 1895#endif 1896 } 1897#endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */ 1898 1899 1900/* Given pointers to KerberosTime and struct tm structs, convert the 1901** KerberosTime string to struct tm. Note that KerberosTime is a 1902** ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional 1903** seconds as defined in RFC 1510. 1904** Return pointer to the (partially) filled in struct tm on success, 1905** return NULL on failure. 1906*/ 1907struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm) 1908 { 1909 char c, *p; 1910 1911 if (!k_tm) return NULL; 1912 if (gtime == NULL || gtime->length < 14) return NULL; 1913 if (gtime->data == NULL) return NULL; 1914 1915 p = (char *)>ime->data[14]; 1916 1917 c = *p; *p = '\0'; p -= 2; k_tm->tm_sec = atoi(p); *(p+2) = c; 1918 c = *p; *p = '\0'; p -= 2; k_tm->tm_min = atoi(p); *(p+2) = c; 1919 c = *p; *p = '\0'; p -= 2; k_tm->tm_hour = atoi(p); *(p+2) = c; 1920 c = *p; *p = '\0'; p -= 2; k_tm->tm_mday = atoi(p); *(p+2) = c; 1921 c = *p; *p = '\0'; p -= 2; k_tm->tm_mon = atoi(p)-1; *(p+2) = c; 1922 c = *p; *p = '\0'; p -= 4; k_tm->tm_year = atoi(p)-1900; *(p+4) = c; 1923 1924 return k_tm; 1925 } 1926 1927 1928/* Helper function for kssl_validate_times(). 1929** We need context->clockskew, but krb5_context is an opaque struct. 1930** So we try to sneek the clockskew out through the replay cache. 1931** If that fails just return a likely default (300 seconds). 1932*/ 1933krb5_deltat get_rc_clockskew(krb5_context context) 1934 { 1935 krb5_rcache rc; 1936 krb5_deltat clockskew; 1937 1938 if (krb5_rc_default(context, &rc)) return KSSL_CLOCKSKEW; 1939 if (krb5_rc_initialize(context, rc, 0)) return KSSL_CLOCKSKEW; 1940 if (krb5_rc_get_lifespan(context, rc, &clockskew)) { 1941 clockskew = KSSL_CLOCKSKEW; 1942 } 1943 (void) krb5_rc_destroy(context, rc); 1944 return clockskew; 1945 } 1946 1947 1948/* kssl_validate_times() combines (and more importantly exposes) 1949** the MIT KRB5 internal function krb5_validate_times() and the 1950** in_clock_skew() macro. The authenticator client time is checked 1951** to be within clockskew secs of the current time and the current 1952** time is checked to be within the ticket start and expire times. 1953** Either check may be omitted by supplying a NULL value. 1954** Returns 0 for valid times, SSL_R_KRB5* error codes otherwise. 1955** See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c 1956** 20010420 VRS 1957*/ 1958krb5_error_code kssl_validate_times( krb5_timestamp atime, 1959 krb5_ticket_times *ttimes) 1960 { 1961 krb5_deltat skew; 1962 krb5_timestamp start, now; 1963 krb5_error_code rc; 1964 krb5_context context; 1965 1966 if ((rc = krb5_init_context(&context))) return SSL_R_KRB5_S_BAD_TICKET; 1967 skew = get_rc_clockskew(context); 1968 if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET; 1969 krb5_free_context(context); 1970 1971 if (atime && labs(atime - now) >= skew) return SSL_R_KRB5_S_TKT_SKEW; 1972 1973 if (! ttimes) return 0; 1974 1975 start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime; 1976 if (start - now > skew) return SSL_R_KRB5_S_TKT_NYV; 1977 if ((now - ttimes->endtime) > skew) return SSL_R_KRB5_S_TKT_EXPIRED; 1978 1979#ifdef KSSL_DEBUG 1980 printf("kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n", 1981 start, atime, now, skew, ttimes->endtime); 1982#endif /* KSSL_DEBUG */ 1983 1984 return 0; 1985 } 1986 1987 1988/* Decode and decrypt given DER-encoded authenticator, then pass 1989** authenticator ctime back in *atimep (or 0 if time unavailable). 1990** Returns krb5_error_code and kssl_err on error. A NULL 1991** authenticator (authentp->length == 0) is not considered an error. 1992** Note that kssl_check_authent() makes use of the KRB5 session key; 1993** you must call kssl_sget_tkt() to get the key before calling this routine. 1994*/ 1995krb5_error_code kssl_check_authent( 1996 /* IN */ KSSL_CTX *kssl_ctx, 1997 /* IN */ krb5_data *authentp, 1998 /* OUT */ krb5_timestamp *atimep, 1999 /* OUT */ KSSL_ERR *kssl_err ) 2000 { 2001 krb5_error_code krb5rc = 0; 2002 KRB5_ENCDATA *dec_authent = NULL; 2003 KRB5_AUTHENTBODY *auth = NULL; 2004 krb5_enctype enctype; 2005 EVP_CIPHER_CTX ciph_ctx; 2006 const EVP_CIPHER *enc = NULL; 2007 unsigned char iv[EVP_MAX_IV_LENGTH]; 2008 const unsigned char *p; 2009 unsigned char *unenc_authent; 2010 int outl, unencbufsize; 2011 struct tm tm_time, *tm_l, *tm_g; 2012 time_t now, tl, tg, tr, tz_offset; 2013 2014 EVP_CIPHER_CTX_init(&ciph_ctx); 2015 *atimep = 0; 2016 kssl_err_set(kssl_err, 0, ""); 2017 2018#ifndef KRB5CHECKAUTH 2019 authentp = NULL; 2020#else 2021#if KRB5CHECKAUTH == 0 2022 authentp = NULL; 2023#endif 2024#endif /* KRB5CHECKAUTH */ 2025 2026 if (authentp == NULL || authentp->length == 0) return 0; 2027 2028#ifdef KSSL_DEBUG 2029 { 2030 unsigned int ui; 2031 printf("kssl_check_authent: authenticator[%d]:\n",authentp->length); 2032 p = authentp->data; 2033 for (ui=0; ui < authentp->length; ui++) printf("%02x ",p[ui]); 2034 printf("\n"); 2035 } 2036#endif /* KSSL_DEBUG */ 2037 2038 unencbufsize = 2 * authentp->length; 2039 if ((unenc_authent = calloc(1, unencbufsize)) == NULL) 2040 { 2041 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2042 "Unable to allocate authenticator buffer.\n"); 2043 krb5rc = KRB5KRB_ERR_GENERIC; 2044 goto err; 2045 } 2046 2047 p = (unsigned char *)authentp->data; 2048 if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p, 2049 (long) authentp->length)) == NULL) 2050 { 2051 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2052 "Error decoding authenticator.\n"); 2053 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2054 goto err; 2055 } 2056 2057 enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */ 2058#if !defined(KRB5_MIT_OLD11) 2059 switch ( enctype ) { 2060 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 2061 case ENCTYPE_DES3_CBC_SHA: 2062 case ENCTYPE_DES3_CBC_RAW: 2063 krb5rc = 0; /* Skip, can't handle derived keys */ 2064 goto err; 2065 } 2066#endif 2067 enc = kssl_map_enc(enctype); 2068 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2069 2070 if (enc == NULL) 2071 { 2072 /* Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1. 2073 ** This enctype indicates the authenticator was encrypted 2074 ** using key-usage derived keys which openssl cannot decrypt. 2075 */ 2076 goto err; 2077 } 2078 2079 if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0)) 2080 { 2081 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2082 "EVP_CipherInit error decrypting authenticator.\n"); 2083 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2084 goto err; 2085 } 2086 outl = dec_authent->cipher->length; 2087 if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl)) 2088 { 2089 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2090 "EVP_Cipher error decrypting authenticator.\n"); 2091 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2092 goto err; 2093 } 2094 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2095 2096#ifdef KSSL_DEBUG 2097 printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl); 2098 for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]); 2099 printf("\n"); 2100#endif /* KSSL_DEBUG */ 2101 2102 if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL) 2103 { 2104 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2105 "confounded by authenticator.\n"); 2106 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2107 goto err; 2108 } 2109 outl -= p - unenc_authent; 2110 2111 if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p, 2112 (long) outl))==NULL) 2113 { 2114 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2115 "Error decoding authenticator body.\n"); 2116 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2117 goto err; 2118 } 2119 2120 memset(&tm_time,0,sizeof(struct tm)); 2121 if (k_gmtime(auth->ctime, &tm_time) && 2122 ((tr = mktime(&tm_time)) != (time_t)(-1))) 2123 { 2124 now = time(&now); 2125 tm_l = localtime(&now); tl = mktime(tm_l); 2126 tm_g = gmtime(&now); tg = mktime(tm_g); 2127 tz_offset = tg - tl; 2128 2129 *atimep = tr - tz_offset; 2130 } 2131 2132#ifdef KSSL_DEBUG 2133 printf("kssl_check_authent: returns %d for client time ", *atimep); 2134 if (auth && auth->ctime && auth->ctime->length && auth->ctime->data) 2135 printf("%.*s\n", auth->ctime->length, auth->ctime->data); 2136 else printf("NULL\n"); 2137#endif /* KSSL_DEBUG */ 2138 2139 err: 2140 if (auth) KRB5_AUTHENT_free((KRB5_AUTHENT *) auth); 2141 if (dec_authent) KRB5_ENCDATA_free(dec_authent); 2142 if (unenc_authent) free(unenc_authent); 2143 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2144 return krb5rc; 2145 } 2146 2147 2148/* Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host), 2149** because I dont't know how to stub varargs. 2150** Returns krb5_error_code == ENOMEM on alloc error, otherwise 2151** passes back newly constructed principal, which should be freed by caller. 2152*/ 2153krb5_error_code kssl_build_principal_2( 2154 /* UPDATE */ krb5_context context, 2155 /* OUT */ krb5_principal *princ, 2156 /* IN */ int rlen, const char *realm, 2157 /* IN */ int slen, const char *svc, 2158 /* IN */ int hlen, const char *host) 2159 { 2160 krb5_data *p_data = NULL; 2161 krb5_principal new_p = NULL; 2162 char *new_r = NULL; 2163 2164 if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL || 2165 (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data))) 2166 == NULL) goto err; 2167 new_p->length = 2; 2168 new_p->data = p_data; 2169 2170 if ((new_r = calloc(1, rlen + 1)) == NULL) goto err; 2171 memcpy(new_r, realm, rlen); 2172 krb5_princ_set_realm_length(context, new_p, rlen); 2173 krb5_princ_set_realm_data(context, new_p, new_r); 2174 2175 if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) goto err; 2176 memcpy(new_p->data[0].data, svc, slen); 2177 new_p->data[0].length = slen; 2178 2179 if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) goto err; 2180 memcpy(new_p->data[1].data, host, hlen); 2181 new_p->data[1].length = hlen; 2182 2183 krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN; 2184 *princ = new_p; 2185 return 0; 2186 2187 err: 2188 if (new_p && new_p[0].data) free(new_p[0].data); 2189 if (new_p && new_p[1].data) free(new_p[1].data); 2190 if (new_p) free(new_p); 2191 if (new_r) free(new_r); 2192 return ENOMEM; 2193 } 2194 2195 2196#else /* !OPENSSL_NO_KRB5 */ 2197 2198#if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS) 2199static void *dummy=&dummy; 2200#endif 2201 2202#endif /* !OPENSSL_NO_KRB5 */ 2203 2204