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