kssl.c revision 296341
1/* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */ 2/* 3 * Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 4 * 2000. 5 */ 6/* ==================================================================== 7 * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60/*- 61 * ssl/kssl.c -- Routines to support (& debug) Kerberos5 auth for openssl 62 * 63 * 19990701 VRS Started. 64 * 200011?? Jeffrey Altman, Richard Levitte 65 * Generalized for Heimdal, Newer MIT, & Win32. 66 * Integrated into main OpenSSL 0.9.7 snapshots. 67 * 20010413 Simon Wilkinson, VRS 68 * Real RFC2712 KerberosWrapper replaces AP_REQ. 69 */ 70 71#include <openssl/opensslconf.h> 72 73#include <string.h> 74 75#define KRB5_PRIVATE 1 76 77#include <openssl/ssl.h> 78#include <openssl/evp.h> 79#include <openssl/objects.h> 80#include <openssl/krb5_asn.h> 81#include "kssl_lcl.h" 82 83#ifndef OPENSSL_NO_KRB5 84 85# ifndef ENOMEM 86# define ENOMEM KRB5KRB_ERR_GENERIC 87# endif 88 89/* 90 * When OpenSSL is built on Windows, we do not want to require that 91 * the Kerberos DLLs be available in order for the OpenSSL DLLs to 92 * work. Therefore, all Kerberos routines are loaded at run time 93 * and we do not link to a .LIB file. 94 */ 95 96# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) 97/* 98 * The purpose of the following pre-processor statements is to provide 99 * compatibility with different releases of MIT Kerberos for Windows. 100 * All versions up to 1.2 used macros. But macros do not allow for 101 * a binary compatible interface for DLLs. Therefore, all macros are 102 * being replaced by function calls. The following code will allow 103 * an OpenSSL DLL built on Windows to work whether or not the macro 104 * or function form of the routines are utilized. 105 */ 106# ifdef krb5_cc_get_principal 107# define NO_DEF_KRB5_CCACHE 108# undef krb5_cc_get_principal 109# endif 110# define krb5_cc_get_principal kssl_krb5_cc_get_principal 111 112# define krb5_free_data_contents kssl_krb5_free_data_contents 113# define krb5_free_context kssl_krb5_free_context 114# define krb5_auth_con_free kssl_krb5_auth_con_free 115# define krb5_free_principal kssl_krb5_free_principal 116# define krb5_mk_req_extended kssl_krb5_mk_req_extended 117# define krb5_get_credentials kssl_krb5_get_credentials 118# define krb5_cc_default kssl_krb5_cc_default 119# define krb5_sname_to_principal kssl_krb5_sname_to_principal 120# define krb5_init_context kssl_krb5_init_context 121# define krb5_free_ticket kssl_krb5_free_ticket 122# define krb5_rd_req kssl_krb5_rd_req 123# define krb5_kt_default kssl_krb5_kt_default 124# define krb5_kt_resolve kssl_krb5_kt_resolve 125/* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */ 126# ifndef krb5_kt_close 127# define krb5_kt_close kssl_krb5_kt_close 128# endif /* krb5_kt_close */ 129# ifndef krb5_kt_get_entry 130# define krb5_kt_get_entry kssl_krb5_kt_get_entry 131# endif /* krb5_kt_get_entry */ 132# define krb5_auth_con_init kssl_krb5_auth_con_init 133 134# define krb5_principal_compare kssl_krb5_principal_compare 135# define krb5_decrypt_tkt_part kssl_krb5_decrypt_tkt_part 136# define krb5_timeofday kssl_krb5_timeofday 137# define krb5_rc_default kssl_krb5_rc_default 138 139# ifdef krb5_rc_initialize 140# undef krb5_rc_initialize 141# endif 142# define krb5_rc_initialize kssl_krb5_rc_initialize 143 144# ifdef krb5_rc_get_lifespan 145# undef krb5_rc_get_lifespan 146# endif 147# define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan 148 149# ifdef krb5_rc_destroy 150# undef krb5_rc_destroy 151# endif 152# define krb5_rc_destroy kssl_krb5_rc_destroy 153 154# define valid_cksumtype kssl_valid_cksumtype 155# define krb5_checksum_size kssl_krb5_checksum_size 156# define krb5_kt_free_entry kssl_krb5_kt_free_entry 157# define krb5_auth_con_setrcache kssl_krb5_auth_con_setrcache 158# define krb5_auth_con_getrcache kssl_krb5_auth_con_getrcache 159# define krb5_get_server_rcache kssl_krb5_get_server_rcache 160 161/* Prototypes for built in stubs */ 162void kssl_krb5_free_data_contents(krb5_context, krb5_data *); 163void kssl_krb5_free_principal(krb5_context, krb5_principal); 164krb5_error_code kssl_krb5_kt_resolve(krb5_context, 165 krb5_const char *, krb5_keytab *); 166krb5_error_code kssl_krb5_kt_default(krb5_context, krb5_keytab *); 167krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *); 168krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, 169 krb5_const krb5_data *, 170 krb5_const_principal, krb5_keytab, 171 krb5_flags *, krb5_ticket **); 172 173krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal, 174 krb5_const_principal); 175krb5_error_code kssl_krb5_mk_req_extended(krb5_context, 176 krb5_auth_context *, 177 krb5_const krb5_flags, 178 krb5_data *, 179 krb5_creds *, 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, krb5_principal *); 187krb5_error_code kssl_krb5_get_credentials(krb5_context, 188 krb5_const krb5_flags, 189 krb5_ccache, 190 krb5_creds *, krb5_creds * *); 191krb5_error_code kssl_krb5_auth_con_init(krb5_context, krb5_auth_context *); 192krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, 193 krb5_ccache cache, 194 krb5_principal *principal); 195krb5_error_code kssl_krb5_auth_con_free(krb5_context, krb5_auth_context); 196size_t kssl_krb5_checksum_size(krb5_context context, krb5_cksumtype ctype); 197krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype); 198krb5_error_code krb5_kt_free_entry(krb5_context, krb5_keytab_entry FAR *); 199krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context, 200 krb5_auth_context, krb5_rcache); 201krb5_error_code kssl_krb5_get_server_rcache(krb5_context, 202 krb5_const krb5_data *, 203 krb5_rcache *); 204krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context, 205 krb5_auth_context, 206 krb5_rcache *); 207 208/* Function pointers (almost all Kerberos functions are _stdcall) */ 209static void (_stdcall *p_krb5_free_data_contents) (krb5_context, krb5_data *) 210 = NULL; 211static void (_stdcall *p_krb5_free_principal) (krb5_context, krb5_principal) 212 = NULL; 213static krb5_error_code(_stdcall *p_krb5_kt_resolve) 214 (krb5_context, krb5_const char *, krb5_keytab *) = NULL; 215static krb5_error_code(_stdcall *p_krb5_kt_default) (krb5_context, 216 krb5_keytab *) = NULL; 217static krb5_error_code(_stdcall *p_krb5_free_ticket) (krb5_context, 218 krb5_ticket *) = NULL; 219static krb5_error_code(_stdcall *p_krb5_rd_req) (krb5_context, 220 krb5_auth_context *, 221 krb5_const krb5_data *, 222 krb5_const_principal, 223 krb5_keytab, krb5_flags *, 224 krb5_ticket **) = NULL; 225static krb5_error_code(_stdcall *p_krb5_mk_req_extended) 226 (krb5_context, krb5_auth_context *, 227 krb5_const krb5_flags, krb5_data *, krb5_creds *, krb5_data *) = NULL; 228static krb5_error_code(_stdcall *p_krb5_init_context) (krb5_context *) = NULL; 229static void (_stdcall *p_krb5_free_context) (krb5_context) = NULL; 230static krb5_error_code(_stdcall *p_krb5_cc_default) (krb5_context, 231 krb5_ccache *) = NULL; 232static krb5_error_code(_stdcall *p_krb5_sname_to_principal) 233 (krb5_context, krb5_const char *, krb5_const char *, 234 krb5_int32, krb5_principal *) = NULL; 235static krb5_error_code(_stdcall *p_krb5_get_credentials) 236 (krb5_context, krb5_const krb5_flags, krb5_ccache, 237 krb5_creds *, krb5_creds **) = NULL; 238static krb5_error_code(_stdcall *p_krb5_auth_con_init) 239 (krb5_context, krb5_auth_context *) = NULL; 240static krb5_error_code(_stdcall *p_krb5_cc_get_principal) 241 (krb5_context context, krb5_ccache cache, krb5_principal *principal) = NULL; 242static krb5_error_code(_stdcall *p_krb5_auth_con_free) 243 (krb5_context, krb5_auth_context) = NULL; 244static krb5_error_code(_stdcall *p_krb5_decrypt_tkt_part) 245 (krb5_context, krb5_const krb5_keyblock *, krb5_ticket *) = NULL; 246static krb5_error_code(_stdcall *p_krb5_timeofday) 247 (krb5_context context, krb5_int32 *timeret) = NULL; 248static krb5_error_code(_stdcall *p_krb5_rc_default) 249 (krb5_context context, krb5_rcache *rc) = NULL; 250static krb5_error_code(_stdcall *p_krb5_rc_initialize) 251 (krb5_context context, krb5_rcache rc, krb5_deltat lifespan) = NULL; 252static krb5_error_code(_stdcall *p_krb5_rc_get_lifespan) 253 (krb5_context context, krb5_rcache rc, krb5_deltat *lifespan) = NULL; 254static krb5_error_code(_stdcall *p_krb5_rc_destroy) 255 (krb5_context context, krb5_rcache rc) = NULL; 256static krb5_boolean(_stdcall *p_krb5_principal_compare) 257 (krb5_context, krb5_const_principal, krb5_const_principal) = NULL; 258static size_t (_stdcall *p_krb5_checksum_size) (krb5_context context, 259 krb5_cksumtype ctype) = NULL; 260static krb5_boolean(_stdcall *p_valid_cksumtype) (krb5_cksumtype ctype) = 261 NULL; 262static krb5_error_code(_stdcall *p_krb5_kt_free_entry) 263 (krb5_context, krb5_keytab_entry *) = NULL; 264static krb5_error_code(_stdcall *p_krb5_auth_con_setrcache) (krb5_context, 265 krb5_auth_context, 266 krb5_rcache) = 267 NULL; 268static krb5_error_code(_stdcall *p_krb5_get_server_rcache) (krb5_context, 269 krb5_const 270 krb5_data *, 271 krb5_rcache *) = 272 NULL; 273static krb5_error_code(*p_krb5_auth_con_getrcache) (krb5_context, 274 krb5_auth_context, 275 krb5_rcache *) = NULL; 276static krb5_error_code(_stdcall *p_krb5_kt_close) (krb5_context context, 277 krb5_keytab keytab) = NULL; 278static krb5_error_code(_stdcall *p_krb5_kt_get_entry) (krb5_context context, 279 krb5_keytab keytab, 280 krb5_const_principal 281 principal, 282 krb5_kvno vno, 283 krb5_enctype enctype, 284 krb5_keytab_entry 285 *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 load_krb5_dll(void) 290{ 291 HANDLE hKRB5_32; 292 293 krb5_loaded++; 294 hKRB5_32 = LoadLibrary(TEXT("KRB5_32")); 295 if (!hKRB5_32) 296 return; 297 298 (FARPROC) p_krb5_free_data_contents = 299 GetProcAddress(hKRB5_32, "krb5_free_data_contents"); 300 (FARPROC) p_krb5_free_context = 301 GetProcAddress(hKRB5_32, "krb5_free_context"); 302 (FARPROC) p_krb5_auth_con_free = 303 GetProcAddress(hKRB5_32, "krb5_auth_con_free"); 304 (FARPROC) p_krb5_free_principal = 305 GetProcAddress(hKRB5_32, "krb5_free_principal"); 306 (FARPROC) p_krb5_mk_req_extended = 307 GetProcAddress(hKRB5_32, "krb5_mk_req_extended"); 308 (FARPROC) p_krb5_get_credentials = 309 GetProcAddress(hKRB5_32, "krb5_get_credentials"); 310 (FARPROC) p_krb5_cc_get_principal = 311 GetProcAddress(hKRB5_32, "krb5_cc_get_principal"); 312 (FARPROC) p_krb5_cc_default = GetProcAddress(hKRB5_32, "krb5_cc_default"); 313 (FARPROC) p_krb5_sname_to_principal = 314 GetProcAddress(hKRB5_32, "krb5_sname_to_principal"); 315 (FARPROC) p_krb5_init_context = 316 GetProcAddress(hKRB5_32, "krb5_init_context"); 317 (FARPROC) p_krb5_free_ticket = 318 GetProcAddress(hKRB5_32, "krb5_free_ticket"); 319 (FARPROC) p_krb5_rd_req = GetProcAddress(hKRB5_32, "krb5_rd_req"); 320 (FARPROC) p_krb5_principal_compare = 321 GetProcAddress(hKRB5_32, "krb5_principal_compare"); 322 (FARPROC) p_krb5_decrypt_tkt_part = 323 GetProcAddress(hKRB5_32, "krb5_decrypt_tkt_part"); 324 (FARPROC) p_krb5_timeofday = GetProcAddress(hKRB5_32, "krb5_timeofday"); 325 (FARPROC) p_krb5_rc_default = GetProcAddress(hKRB5_32, "krb5_rc_default"); 326 (FARPROC) p_krb5_rc_initialize = 327 GetProcAddress(hKRB5_32, "krb5_rc_initialize"); 328 (FARPROC) p_krb5_rc_get_lifespan = 329 GetProcAddress(hKRB5_32, "krb5_rc_get_lifespan"); 330 (FARPROC) p_krb5_rc_destroy = GetProcAddress(hKRB5_32, "krb5_rc_destroy"); 331 (FARPROC) p_krb5_kt_default = GetProcAddress(hKRB5_32, "krb5_kt_default"); 332 (FARPROC) p_krb5_kt_resolve = GetProcAddress(hKRB5_32, "krb5_kt_resolve"); 333 (FARPROC) p_krb5_auth_con_init = 334 GetProcAddress(hKRB5_32, "krb5_auth_con_init"); 335 (FARPROC) p_valid_cksumtype = GetProcAddress(hKRB5_32, "valid_cksumtype"); 336 (FARPROC) p_krb5_checksum_size = 337 GetProcAddress(hKRB5_32, "krb5_checksum_size"); 338 (FARPROC) p_krb5_kt_free_entry = 339 GetProcAddress(hKRB5_32, "krb5_kt_free_entry"); 340 (FARPROC) p_krb5_auth_con_setrcache = 341 GetProcAddress(hKRB5_32, "krb5_auth_con_setrcache"); 342 (FARPROC) p_krb5_get_server_rcache = 343 GetProcAddress(hKRB5_32, "krb5_get_server_rcache"); 344 (FARPROC) p_krb5_auth_con_getrcache = 345 GetProcAddress(hKRB5_32, "krb5_auth_con_getrcache"); 346 (FARPROC) p_krb5_kt_close = GetProcAddress(hKRB5_32, "krb5_kt_close"); 347 (FARPROC) p_krb5_kt_get_entry = 348 GetProcAddress(hKRB5_32, "krb5_kt_get_entry"); 349} 350 351/* Stubs for each function to be dynamicly loaded */ 352void kssl_krb5_free_data_contents(krb5_context CO, krb5_data *data) 353{ 354 if (!krb5_loaded) 355 load_krb5_dll(); 356 357 if (p_krb5_free_data_contents) 358 p_krb5_free_data_contents(CO, data); 359} 360 361krb5_error_code 362kssl_krb5_mk_req_extended(krb5_context CO, 363 krb5_auth_context *pACO, 364 krb5_const krb5_flags F, 365 krb5_data *pD1, krb5_creds *pC, krb5_data *pD2) 366{ 367 if (!krb5_loaded) 368 load_krb5_dll(); 369 370 if (p_krb5_mk_req_extended) 371 return (p_krb5_mk_req_extended(CO, pACO, F, pD1, pC, pD2)); 372 else 373 return KRB5KRB_ERR_GENERIC; 374} 375 376krb5_error_code 377kssl_krb5_auth_con_init(krb5_context CO, krb5_auth_context *pACO) 378{ 379 if (!krb5_loaded) 380 load_krb5_dll(); 381 382 if (p_krb5_auth_con_init) 383 return (p_krb5_auth_con_init(CO, pACO)); 384 else 385 return KRB5KRB_ERR_GENERIC; 386} 387 388krb5_error_code 389kssl_krb5_auth_con_free(krb5_context CO, krb5_auth_context ACO) 390{ 391 if (!krb5_loaded) 392 load_krb5_dll(); 393 394 if (p_krb5_auth_con_free) 395 return (p_krb5_auth_con_free(CO, ACO)); 396 else 397 return KRB5KRB_ERR_GENERIC; 398} 399 400krb5_error_code 401kssl_krb5_get_credentials(krb5_context CO, 402 krb5_const krb5_flags F, 403 krb5_ccache CC, krb5_creds *pCR, krb5_creds **ppCR) 404{ 405 if (!krb5_loaded) 406 load_krb5_dll(); 407 408 if (p_krb5_get_credentials) 409 return (p_krb5_get_credentials(CO, F, CC, pCR, ppCR)); 410 else 411 return KRB5KRB_ERR_GENERIC; 412} 413 414krb5_error_code 415kssl_krb5_sname_to_principal(krb5_context CO, 416 krb5_const char *pC1, 417 krb5_const char *pC2, 418 krb5_int32 I, krb5_principal *pPR) 419{ 420 if (!krb5_loaded) 421 load_krb5_dll(); 422 423 if (p_krb5_sname_to_principal) 424 return (p_krb5_sname_to_principal(CO, pC1, pC2, I, pPR)); 425 else 426 return KRB5KRB_ERR_GENERIC; 427} 428 429krb5_error_code kssl_krb5_cc_default(krb5_context CO, krb5_ccache *pCC) 430{ 431 if (!krb5_loaded) 432 load_krb5_dll(); 433 434 if (p_krb5_cc_default) 435 return (p_krb5_cc_default(CO, pCC)); 436 else 437 return KRB5KRB_ERR_GENERIC; 438} 439 440krb5_error_code kssl_krb5_init_context(krb5_context *pCO) 441{ 442 if (!krb5_loaded) 443 load_krb5_dll(); 444 445 if (p_krb5_init_context) 446 return (p_krb5_init_context(pCO)); 447 else 448 return KRB5KRB_ERR_GENERIC; 449} 450 451void kssl_krb5_free_context(krb5_context CO) 452{ 453 if (!krb5_loaded) 454 load_krb5_dll(); 455 456 if (p_krb5_free_context) 457 p_krb5_free_context(CO); 458} 459 460void kssl_krb5_free_principal(krb5_context c, krb5_principal p) 461{ 462 if (!krb5_loaded) 463 load_krb5_dll(); 464 465 if (p_krb5_free_principal) 466 p_krb5_free_principal(c, p); 467} 468 469krb5_error_code 470kssl_krb5_kt_resolve(krb5_context con, krb5_const char *sz, krb5_keytab *kt) 471{ 472 if (!krb5_loaded) 473 load_krb5_dll(); 474 475 if (p_krb5_kt_resolve) 476 return (p_krb5_kt_resolve(con, sz, kt)); 477 else 478 return KRB5KRB_ERR_GENERIC; 479} 480 481krb5_error_code kssl_krb5_kt_default(krb5_context con, krb5_keytab *kt) 482{ 483 if (!krb5_loaded) 484 load_krb5_dll(); 485 486 if (p_krb5_kt_default) 487 return (p_krb5_kt_default(con, kt)); 488 else 489 return KRB5KRB_ERR_GENERIC; 490} 491 492krb5_error_code kssl_krb5_free_ticket(krb5_context con, krb5_ticket *kt) 493{ 494 if (!krb5_loaded) 495 load_krb5_dll(); 496 497 if (p_krb5_free_ticket) 498 return (p_krb5_free_ticket(con, kt)); 499 else 500 return KRB5KRB_ERR_GENERIC; 501} 502 503krb5_error_code 504kssl_krb5_rd_req(krb5_context con, krb5_auth_context *pacon, 505 krb5_const krb5_data *data, 506 krb5_const_principal princ, krb5_keytab keytab, 507 krb5_flags *flags, krb5_ticket **pptkt) 508{ 509 if (!krb5_loaded) 510 load_krb5_dll(); 511 512 if (p_krb5_rd_req) 513 return (p_krb5_rd_req(con, pacon, data, princ, keytab, flags, pptkt)); 514 else 515 return KRB5KRB_ERR_GENERIC; 516} 517 518krb5_boolean 519krb5_principal_compare(krb5_context con, krb5_const_principal princ1, 520 krb5_const_principal princ2) 521{ 522 if (!krb5_loaded) 523 load_krb5_dll(); 524 525 if (p_krb5_principal_compare) 526 return (p_krb5_principal_compare(con, princ1, princ2)); 527 else 528 return KRB5KRB_ERR_GENERIC; 529} 530 531krb5_error_code 532krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys, 533 krb5_ticket *ticket) 534{ 535 if (!krb5_loaded) 536 load_krb5_dll(); 537 538 if (p_krb5_decrypt_tkt_part) 539 return (p_krb5_decrypt_tkt_part(con, keys, ticket)); 540 else 541 return KRB5KRB_ERR_GENERIC; 542} 543 544krb5_error_code krb5_timeofday(krb5_context con, krb5_int32 *timeret) 545{ 546 if (!krb5_loaded) 547 load_krb5_dll(); 548 549 if (p_krb5_timeofday) 550 return (p_krb5_timeofday(con, timeret)); 551 else 552 return KRB5KRB_ERR_GENERIC; 553} 554 555krb5_error_code krb5_rc_default(krb5_context con, krb5_rcache *rc) 556{ 557 if (!krb5_loaded) 558 load_krb5_dll(); 559 560 if (p_krb5_rc_default) 561 return (p_krb5_rc_default(con, rc)); 562 else 563 return KRB5KRB_ERR_GENERIC; 564} 565 566krb5_error_code 567krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan) 568{ 569 if (!krb5_loaded) 570 load_krb5_dll(); 571 572 if (p_krb5_rc_initialize) 573 return (p_krb5_rc_initialize(con, rc, lifespan)); 574 else 575 return KRB5KRB_ERR_GENERIC; 576} 577 578krb5_error_code 579krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp) 580{ 581 if (!krb5_loaded) 582 load_krb5_dll(); 583 584 if (p_krb5_rc_get_lifespan) 585 return (p_krb5_rc_get_lifespan(con, rc, lifespanp)); 586 else 587 return KRB5KRB_ERR_GENERIC; 588} 589 590krb5_error_code krb5_rc_destroy(krb5_context con, krb5_rcache rc) 591{ 592 if (!krb5_loaded) 593 load_krb5_dll(); 594 595 if (p_krb5_rc_destroy) 596 return (p_krb5_rc_destroy(con, rc)); 597 else 598 return KRB5KRB_ERR_GENERIC; 599} 600 601size_t krb5_checksum_size(krb5_context context, krb5_cksumtype ctype) 602{ 603 if (!krb5_loaded) 604 load_krb5_dll(); 605 606 if (p_krb5_checksum_size) 607 return (p_krb5_checksum_size(context, ctype)); 608 else 609 return KRB5KRB_ERR_GENERIC; 610} 611 612krb5_boolean valid_cksumtype(krb5_cksumtype ctype) 613{ 614 if (!krb5_loaded) 615 load_krb5_dll(); 616 617 if (p_valid_cksumtype) 618 return (p_valid_cksumtype(ctype)); 619 else 620 return KRB5KRB_ERR_GENERIC; 621} 622 623krb5_error_code krb5_kt_free_entry(krb5_context con, krb5_keytab_entry *entry) 624{ 625 if (!krb5_loaded) 626 load_krb5_dll(); 627 628 if (p_krb5_kt_free_entry) 629 return (p_krb5_kt_free_entry(con, entry)); 630 else 631 return KRB5KRB_ERR_GENERIC; 632} 633 634/* Structure definitions */ 635# ifndef NO_DEF_KRB5_CCACHE 636# ifndef krb5_x 637# define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1)) 638# define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0)) 639# endif 640 641typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */ 642 643typedef struct _krb5_ccache { 644 krb5_magic magic; 645 struct _krb5_cc_ops FAR *ops; 646 krb5_pointer data; 647} *krb5_ccache; 648 649typedef struct _krb5_cc_ops { 650 krb5_magic magic; 651 char *prefix; 652 char *(KRB5_CALLCONV *get_name) 653 (krb5_context, krb5_ccache); 654 krb5_error_code(KRB5_CALLCONV *resolve) 655 (krb5_context, krb5_ccache *, const char *); 656 krb5_error_code(KRB5_CALLCONV *gen_new) 657 (krb5_context, krb5_ccache *); 658 krb5_error_code(KRB5_CALLCONV *init) 659 (krb5_context, krb5_ccache, krb5_principal); 660 krb5_error_code(KRB5_CALLCONV *destroy) 661 (krb5_context, krb5_ccache); 662 krb5_error_code(KRB5_CALLCONV *close) 663 (krb5_context, krb5_ccache); 664 krb5_error_code(KRB5_CALLCONV *store) 665 (krb5_context, krb5_ccache, krb5_creds *); 666 krb5_error_code(KRB5_CALLCONV *retrieve) 667 (krb5_context, krb5_ccache, krb5_flags, krb5_creds *, krb5_creds *); 668 krb5_error_code(KRB5_CALLCONV *get_princ) 669 (krb5_context, krb5_ccache, krb5_principal *); 670 krb5_error_code(KRB5_CALLCONV *get_first) 671 (krb5_context, krb5_ccache, krb5_cc_cursor *); 672 krb5_error_code(KRB5_CALLCONV *get_next) 673 (krb5_context, krb5_ccache, krb5_cc_cursor *, krb5_creds *); 674 krb5_error_code(KRB5_CALLCONV *end_get) 675 (krb5_context, krb5_ccache, krb5_cc_cursor *); 676 krb5_error_code(KRB5_CALLCONV *remove_cred) 677 (krb5_context, krb5_ccache, krb5_flags, krb5_creds *); 678 krb5_error_code(KRB5_CALLCONV *set_flags) 679 (krb5_context, krb5_ccache, krb5_flags); 680} krb5_cc_ops; 681# endif /* NO_DEF_KRB5_CCACHE */ 682 683krb5_error_code 684 kssl_krb5_cc_get_principal 685 (krb5_context context, krb5_ccache cache, krb5_principal *principal) { 686 if (p_krb5_cc_get_principal) 687 return (p_krb5_cc_get_principal(context, cache, principal)); 688 else 689 return (krb5_x((cache)->ops->get_princ, (context, cache, principal))); 690} 691 692krb5_error_code 693kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon, 694 krb5_rcache rcache) 695{ 696 if (p_krb5_auth_con_setrcache) 697 return (p_krb5_auth_con_setrcache(con, acon, rcache)); 698 else 699 return KRB5KRB_ERR_GENERIC; 700} 701 702krb5_error_code 703kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data *data, 704 krb5_rcache *rcache) 705{ 706 if (p_krb5_get_server_rcache) 707 return (p_krb5_get_server_rcache(con, data, rcache)); 708 else 709 return KRB5KRB_ERR_GENERIC; 710} 711 712krb5_error_code 713kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon, 714 krb5_rcache *prcache) 715{ 716 if (p_krb5_auth_con_getrcache) 717 return (p_krb5_auth_con_getrcache(con, acon, prcache)); 718 else 719 return KRB5KRB_ERR_GENERIC; 720} 721 722krb5_error_code kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab) 723{ 724 if (p_krb5_kt_close) 725 return (p_krb5_kt_close(context, keytab)); 726 else 727 return KRB5KRB_ERR_GENERIC; 728} 729 730krb5_error_code 731kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab, 732 krb5_const_principal principal, krb5_kvno vno, 733 krb5_enctype enctype, krb5_keytab_entry *entry) 734{ 735 if (p_krb5_kt_get_entry) 736 return (p_krb5_kt_get_entry 737 (context, keytab, principal, vno, enctype, entry)); 738 else 739 return KRB5KRB_ERR_GENERIC; 740} 741# endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */ 742 743/* 744 * memory allocation functions for non-temporary storage (e.g. stuff that 745 * gets saved into the kssl context) 746 */ 747static void *kssl_calloc(size_t nmemb, size_t size) 748{ 749 void *p; 750 751 p = OPENSSL_malloc(nmemb * size); 752 if (p) { 753 memset(p, 0, nmemb * size); 754 } 755 return p; 756} 757 758# define kssl_malloc(size) OPENSSL_malloc((size)) 759# define kssl_realloc(ptr, size) OPENSSL_realloc(ptr, size) 760# define kssl_free(ptr) OPENSSL_free((ptr)) 761 762char 763*kstring(char *string) 764{ 765 static char *null = "[NULL]"; 766 767 return ((string == NULL) ? null : string); 768} 769 770/* 771 * Given KRB5 enctype (basically DES or 3DES), return closest match openssl 772 * EVP_ encryption algorithm. Return NULL for unknown or problematic 773 * (krb5_dk_encrypt) enctypes. Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are 774 * OK. 775 */ 776const EVP_CIPHER *kssl_map_enc(krb5_enctype enctype) 777{ 778 switch (enctype) { 779 case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */ 780 case ENCTYPE_DES_CBC_CRC: 781 case ENCTYPE_DES_CBC_MD4: 782 case ENCTYPE_DES_CBC_MD5: 783 case ENCTYPE_DES_CBC_RAW: 784 return EVP_des_cbc(); 785 break; 786 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 787 case ENCTYPE_DES3_CBC_SHA: 788 case ENCTYPE_DES3_CBC_RAW: 789 return EVP_des_ede3_cbc(); 790 break; 791 default: 792 return NULL; 793 break; 794 } 795} 796 797/* 798 * Return true:1 if p "looks like" the start of the real authenticator 799 * described in kssl_skip_confound() below. The ASN.1 pattern is "62 xx 30 800 * yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and xx and yy are 801 * possibly multi-byte length fields. 802 */ 803static int kssl_test_confound(unsigned char *p) 804{ 805 int len = 2; 806 int xx = 0, yy = 0; 807 808 if (*p++ != 0x62) 809 return 0; 810 if (*p > 0x82) 811 return 0; 812 switch (*p) { 813 case 0x82: 814 p++; 815 xx = (*p++ << 8); 816 xx += *p++; 817 break; 818 case 0x81: 819 p++; 820 xx = *p++; 821 break; 822 case 0x80: 823 return 0; 824 default: 825 xx = *p++; 826 break; 827 } 828 if (*p++ != 0x30) 829 return 0; 830 if (*p > 0x82) 831 return 0; 832 switch (*p) { 833 case 0x82: 834 p++; 835 len += 2; 836 yy = (*p++ << 8); 837 yy += *p++; 838 break; 839 case 0x81: 840 p++; 841 len++; 842 yy = *p++; 843 break; 844 case 0x80: 845 return 0; 846 default: 847 yy = *p++; 848 break; 849 } 850 851 return (xx - len == yy) ? 1 : 0; 852} 853 854/* 855 * Allocate, fill, and return cksumlens array of checksum lengths. This 856 * array holds just the unique elements from the krb5_cksumarray[]. array[n] 857 * == 0 signals end of data. The krb5_cksumarray[] was an internal variable 858 * that has since been replaced by a more general method for storing the 859 * data. It should not be used. Instead we use real API calls and make a 860 * guess for what the highest assigned CKSUMTYPE_ constant is. As of 1.2.2 861 * it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3). So we will use 0x0010. 862 */ 863static size_t *populate_cksumlens(void) 864{ 865 int i, j, n; 866 static size_t *cklens = NULL; 867 868# ifdef KRB5_MIT_OLD11 869 n = krb5_max_cksum; 870# else 871 n = 0x0010; 872# endif /* KRB5_MIT_OLD11 */ 873 874# ifdef KRB5CHECKAUTH 875 if (!cklens && !(cklens = (size_t *)calloc(sizeof(int), n + 1))) 876 return NULL; 877 878 for (i = 0; i < n; i++) { 879 if (!valid_cksumtype(i)) 880 continue; /* array has holes */ 881 for (j = 0; j < n; j++) { 882 if (cklens[j] == 0) { 883 cklens[j] = krb5_checksum_size(NULL, i); 884 break; /* krb5 elem was new: add */ 885 } 886 if (cklens[j] == krb5_checksum_size(NULL, i)) { 887 break; /* ignore duplicate elements */ 888 } 889 } 890 } 891# endif /* KRB5CHECKAUTH */ 892 893 return cklens; 894} 895 896/*- 897 * Return pointer to start of real authenticator within authenticator, or 898 * return NULL on error. 899 * Decrypted authenticator looks like this: 900 * [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r] 901 * This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the 902 * krb5_auth_con_getcksumtype() function advertised in its krb5.h. 903 */ 904unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a) 905{ 906 int i, conlen; 907 size_t cklen; 908 static size_t *cksumlens = NULL; 909 unsigned char *test_auth; 910 911 conlen = (etype) ? 8 : 0; 912 913 if (!cksumlens && !(cksumlens = populate_cksumlens())) 914 return NULL; 915 for (i = 0; (cklen = cksumlens[i]) != 0; i++) { 916 test_auth = a + conlen + cklen; 917 if (kssl_test_confound(test_auth)) 918 return test_auth; 919 } 920 921 return NULL; 922} 923 924/* 925 * Set kssl_err error info when reason text is a simple string kssl_err = 926 * struct { int reason; char text[KSSL_ERR_MAX+1]; } 927 */ 928void kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text) 929{ 930 if (kssl_err == NULL) 931 return; 932 933 kssl_err->reason = reason; 934 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "%s", text); 935 return; 936} 937 938/* 939 * Display contents of krb5_data struct, for debugging 940 */ 941void print_krb5_data(char *label, krb5_data *kdata) 942{ 943 int i; 944 945 fprintf(stderr, "%s[%d] ", label, kdata->length); 946 for (i = 0; i < (int)kdata->length; i++) { 947 if (0 && isprint((int)kdata->data[i])) 948 fprintf(stderr, "%c ", kdata->data[i]); 949 else 950 fprintf(stderr, "%02x ", (unsigned char)kdata->data[i]); 951 } 952 fprintf(stderr, "\n"); 953} 954 955/* 956 * Display contents of krb5_authdata struct, for debugging 957 */ 958void print_krb5_authdata(char *label, krb5_authdata **adata) 959{ 960 if (adata == NULL) { 961 fprintf(stderr, "%s, authdata==0\n", label); 962 return; 963 } 964 fprintf(stderr, "%s [%p]\n", label, (void *)adata); 965# if 0 966 { 967 int i; 968 fprintf(stderr, "%s[at%d:%d] ", label, adata->ad_type, adata->length); 969 for (i = 0; i < adata->length; i++) { 970 fprintf(stderr, (isprint(adata->contents[i])) ? "%c " : "%02x", 971 adata->contents[i]); 972 } 973 fprintf(stderr, "\n"); 974 } 975# endif 976} 977 978/* 979 * Display contents of krb5_keyblock struct, for debugging 980 */ 981void print_krb5_keyblock(char *label, krb5_keyblock *keyblk) 982{ 983 int i; 984 985 if (keyblk == NULL) { 986 fprintf(stderr, "%s, keyblk==0\n", label); 987 return; 988 } 989# ifdef KRB5_HEIMDAL 990 fprintf(stderr, "%s\n\t[et%d:%d]: ", label, keyblk->keytype, 991 keyblk->keyvalue->length); 992 for (i = 0; i < (int)keyblk->keyvalue->length; i++) { 993 fprintf(stderr, "%02x", 994 (unsigned char *)(keyblk->keyvalue->contents)[i]); 995 } 996 fprintf(stderr, "\n"); 997# else 998 fprintf(stderr, "%s\n\t[et%d:%d]: ", label, keyblk->enctype, 999 keyblk->length); 1000 for (i = 0; i < (int)keyblk->length; i++) { 1001 fprintf(stderr, "%02x", keyblk->contents[i]); 1002 } 1003 fprintf(stderr, "\n"); 1004# endif 1005} 1006 1007/* 1008 * Display contents of krb5_principal_data struct, for debugging 1009 * (krb5_principal is typedef'd == krb5_principal_data *) 1010 */ 1011static void print_krb5_princ(char *label, krb5_principal_data *princ) 1012{ 1013 int i, ui, uj; 1014 1015 fprintf(stderr, "%s principal Realm: ", label); 1016 if (princ == NULL) 1017 return; 1018 for (ui = 0; ui < (int)princ->realm.length; ui++) 1019 putchar(princ->realm.data[ui]); 1020 fprintf(stderr, " (nametype %d) has %d strings:\n", princ->type, 1021 princ->length); 1022 for (i = 0; i < (int)princ->length; i++) { 1023 fprintf(stderr, "\t%d [%d]: ", i, princ->data[i].length); 1024 for (uj = 0; uj < (int)princ->data[i].length; uj++) { 1025 putchar(princ->data[i].data[uj]); 1026 } 1027 fprintf(stderr, "\n"); 1028 } 1029 return; 1030} 1031 1032/*- Given krb5 service (typically "kssl") and hostname in kssl_ctx, 1033 * Return encrypted Kerberos ticket for service @ hostname. 1034 * If authenp is non-NULL, also return encrypted authenticator, 1035 * whose data should be freed by caller. 1036 * (Originally was: Create Kerberos AP_REQ message for SSL Client.) 1037 * 1038 * 19990628 VRS Started; Returns Kerberos AP_REQ message. 1039 * 20010409 VRS Modified for RFC2712; Returns enc tkt. 1040 * 20010606 VRS May also return optional authenticator. 1041 */ 1042krb5_error_code kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1043 /* 1044 * OUT 1045 */ krb5_data **enc_ticketp, 1046 /* 1047 * UPDATE 1048 */ krb5_data *authenp, 1049 /* 1050 * OUT 1051 */ KSSL_ERR *kssl_err) 1052{ 1053 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1054 krb5_context krb5context = NULL; 1055 krb5_auth_context krb5auth_context = NULL; 1056 krb5_ccache krb5ccdef = NULL; 1057 krb5_creds krb5creds, *krb5credsp = NULL; 1058 krb5_data krb5_app_req; 1059 1060 kssl_err_set(kssl_err, 0, ""); 1061 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1062 1063 if (!kssl_ctx) { 1064 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n"); 1065 goto err; 1066 } else if (!kssl_ctx->service_host) { 1067 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1068 "kssl_ctx service_host undefined.\n"); 1069 goto err; 1070 } 1071 1072 if ((krb5rc = krb5_init_context(&krb5context)) != 0) { 1073 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1074 "krb5_init_context() fails: %d\n", krb5rc); 1075 kssl_err->reason = SSL_R_KRB5_C_INIT; 1076 goto err; 1077 } 1078 1079 if ((krb5rc = krb5_sname_to_principal(krb5context, 1080 kssl_ctx->service_host, 1081 (kssl_ctx->service_name) ? 1082 kssl_ctx->service_name : KRB5SVC, 1083 KRB5_NT_SRV_HST, 1084 &krb5creds.server)) != 0) { 1085 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1086 "krb5_sname_to_principal() fails for %s/%s\n", 1087 kssl_ctx->service_host, 1088 (kssl_ctx-> 1089 service_name) ? kssl_ctx->service_name : KRB5SVC); 1090 kssl_err->reason = SSL_R_KRB5_C_INIT; 1091 goto err; 1092 } 1093 1094 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) { 1095 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1096 "krb5_cc_default fails.\n"); 1097 goto err; 1098 } 1099 1100 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1101 &krb5creds.client)) != 0) { 1102 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC, 1103 "krb5_cc_get_principal() fails.\n"); 1104 goto err; 1105 } 1106 1107 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1108 &krb5creds, &krb5credsp)) != 0) { 1109 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED, 1110 "krb5_get_credentials() fails.\n"); 1111 goto err; 1112 } 1113 1114 *enc_ticketp = &krb5credsp->ticket; 1115# ifdef KRB5_HEIMDAL 1116 kssl_ctx->enctype = krb5credsp->session.keytype; 1117# else 1118 kssl_ctx->enctype = krb5credsp->keyblock.enctype; 1119# endif 1120 1121 krb5rc = KRB5KRB_ERR_GENERIC; 1122 /* caller should free data of krb5_app_req */ 1123 /* 1124 * 20010406 VRS deleted for real KerberosWrapper 20010605 VRS reinstated 1125 * to offer Authenticator to KerberosWrapper 1126 */ 1127 krb5_app_req.length = 0; 1128 if (authenp) { 1129 krb5_data krb5in_data; 1130 const unsigned char *p; 1131 long arlen; 1132 KRB5_APREQBODY *ap_req; 1133 1134 authenp->length = 0; 1135 krb5in_data.data = NULL; 1136 krb5in_data.length = 0; 1137 if ((krb5rc = krb5_mk_req_extended(krb5context, 1138 &krb5auth_context, 0, &krb5in_data, 1139 krb5credsp, &krb5_app_req)) != 0) { 1140 kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ, 1141 "krb5_mk_req_extended() fails.\n"); 1142 goto err; 1143 } 1144 1145 arlen = krb5_app_req.length; 1146 p = (unsigned char *)krb5_app_req.data; 1147 ap_req = (KRB5_APREQBODY *)d2i_KRB5_APREQ(NULL, &p, arlen); 1148 if (ap_req) { 1149 authenp->length = i2d_KRB5_ENCDATA(ap_req->authenticator, NULL); 1150 if (authenp->length && (authenp->data = malloc(authenp->length))) { 1151 unsigned char *adp = (unsigned char *)authenp->data; 1152 authenp->length = 1153 i2d_KRB5_ENCDATA(ap_req->authenticator, &adp); 1154 } 1155 } 1156 1157 if (ap_req) 1158 KRB5_APREQ_free((KRB5_APREQ *) ap_req); 1159 if (krb5_app_req.length) 1160 kssl_krb5_free_data_contents(krb5context, &krb5_app_req); 1161 } 1162# ifdef KRB5_HEIMDAL 1163 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session)) { 1164 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1165 "kssl_ctx_setkey() fails.\n"); 1166 } 1167# else 1168 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock)) { 1169 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT, 1170 "kssl_ctx_setkey() fails.\n"); 1171 } 1172# endif 1173 else 1174 krb5rc = 0; 1175 1176 err: 1177# ifdef KSSL_DEBUG 1178 kssl_ctx_show(kssl_ctx); 1179# endif /* KSSL_DEBUG */ 1180 1181 if (krb5creds.client) 1182 krb5_free_principal(krb5context, krb5creds.client); 1183 if (krb5creds.server) 1184 krb5_free_principal(krb5context, krb5creds.server); 1185 if (krb5auth_context) 1186 krb5_auth_con_free(krb5context, krb5auth_context); 1187 if (krb5context) 1188 krb5_free_context(krb5context); 1189 return (krb5rc); 1190} 1191 1192/*- 1193 * Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket. 1194 * Return Kerberos error code and kssl_err struct on error. 1195 * Allocates krb5_ticket and krb5_principal; caller should free these. 1196 * 1197 * 20010410 VRS Implemented krb5_decode_ticket() as 1198 * old_krb5_decode_ticket(). Missing from MIT1.0.6. 1199 * 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions. 1200 * Re-used some of the old krb5_decode_ticket() 1201 * code here. This tkt should alloc/free just 1202 * like the real thing. 1203 */ 1204static krb5_error_code kssl_TKT2tkt( /* IN */ krb5_context krb5context, 1205 /* 1206 * IN 1207 */ KRB5_TKTBODY *asn1ticket, 1208 /* 1209 * OUT 1210 */ krb5_ticket **krb5ticket, 1211 /* 1212 * OUT 1213 */ KSSL_ERR *kssl_err) 1214{ 1215 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1216 krb5_ticket *new5ticket = NULL; 1217 ASN1_GENERALSTRING *gstr_svc, *gstr_host; 1218 1219 *krb5ticket = NULL; 1220 1221 if (asn1ticket == NULL || asn1ticket->realm == NULL || 1222 asn1ticket->sname == NULL || 1223 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2) { 1224 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1225 "Null field in asn1ticket.\n"); 1226 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1227 return KRB5KRB_ERR_GENERIC; 1228 } 1229 1230 if ((new5ticket = (krb5_ticket *)calloc(1, sizeof(krb5_ticket))) == NULL) { 1231 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1232 "Unable to allocate new krb5_ticket.\n"); 1233 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1234 return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */ 1235 } 1236 1237 gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0); 1238 gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1); 1239 1240 if ((krb5rc = kssl_build_principal_2(krb5context, 1241 &new5ticket->server, 1242 asn1ticket->realm->length, 1243 (char *)asn1ticket->realm->data, 1244 gstr_svc->length, 1245 (char *)gstr_svc->data, 1246 gstr_host->length, 1247 (char *)gstr_host->data)) != 0) { 1248 free(new5ticket); 1249 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1250 "Error building ticket server principal.\n"); 1251 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1252 return krb5rc; /* or KRB5KRB_ERR_GENERIC; */ 1253 } 1254 1255 krb5_princ_type(krb5context, new5ticket->server) = 1256 asn1ticket->sname->nametype->data[0]; 1257 new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0]; 1258 new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0]; 1259 new5ticket->enc_part.ciphertext.length = 1260 asn1ticket->encdata->cipher->length; 1261 if ((new5ticket->enc_part.ciphertext.data = 1262 calloc(1, asn1ticket->encdata->cipher->length)) == NULL) { 1263 free(new5ticket); 1264 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1265 "Error allocating cipher in krb5ticket.\n"); 1266 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1267 return KRB5KRB_ERR_GENERIC; 1268 } else { 1269 memcpy(new5ticket->enc_part.ciphertext.data, 1270 asn1ticket->encdata->cipher->data, 1271 asn1ticket->encdata->cipher->length); 1272 } 1273 1274 *krb5ticket = new5ticket; 1275 return 0; 1276} 1277 1278/*- 1279 * Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"), 1280 * and krb5 AP_REQ message & message length, 1281 * Return Kerberos session key and client principle 1282 * to SSL Server in KSSL_CTX *kssl_ctx. 1283 * 1284 * 19990702 VRS Started. 1285 */ 1286krb5_error_code kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx, 1287 /* 1288 * IN 1289 */ krb5_data *indata, 1290 /* 1291 * OUT 1292 */ krb5_ticket_times *ttimes, 1293 /* 1294 * OUT 1295 */ KSSL_ERR *kssl_err) 1296{ 1297 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1298 static krb5_context krb5context = NULL; 1299 static krb5_auth_context krb5auth_context = NULL; 1300 krb5_ticket *krb5ticket = NULL; 1301 KRB5_TKTBODY *asn1ticket = NULL; 1302 const unsigned char *p; 1303 krb5_keytab krb5keytab = NULL; 1304 krb5_keytab_entry kt_entry; 1305 krb5_principal krb5server; 1306 krb5_rcache rcache = NULL; 1307 1308 kssl_err_set(kssl_err, 0, ""); 1309 1310 if (!kssl_ctx) { 1311 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n"); 1312 goto err; 1313 } 1314# ifdef KSSL_DEBUG 1315 fprintf(stderr, "in kssl_sget_tkt(%s)\n", 1316 kstring(kssl_ctx->service_name)); 1317# endif /* KSSL_DEBUG */ 1318 1319 if (!krb5context && (krb5rc = krb5_init_context(&krb5context))) { 1320 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1321 "krb5_init_context() fails.\n"); 1322 goto err; 1323 } 1324 if (krb5auth_context && 1325 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context))) { 1326 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1327 "krb5_auth_con_free() fails.\n"); 1328 goto err; 1329 } else 1330 krb5auth_context = NULL; 1331 if (!krb5auth_context && 1332 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context))) { 1333 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1334 "krb5_auth_con_init() fails.\n"); 1335 goto err; 1336 } 1337 1338 if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context, 1339 &rcache))) { 1340 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1341 "krb5_auth_con_getrcache() fails.\n"); 1342 goto err; 1343 } 1344 1345 if ((krb5rc = krb5_sname_to_principal(krb5context, NULL, 1346 (kssl_ctx->service_name) ? 1347 kssl_ctx->service_name : KRB5SVC, 1348 KRB5_NT_SRV_HST, 1349 &krb5server)) != 0) { 1350 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1351 "krb5_sname_to_principal() fails.\n"); 1352 goto err; 1353 } 1354 1355 if (rcache == NULL) { 1356 if ((krb5rc = krb5_get_server_rcache(krb5context, 1357 krb5_princ_component(krb5context, 1358 krb5server, 1359 0), 1360 &rcache))) { 1361 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1362 "krb5_get_server_rcache() fails.\n"); 1363 goto err; 1364 } 1365 } 1366 1367 if ((krb5rc = 1368 krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache))) { 1369 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1370 "krb5_auth_con_setrcache() fails.\n"); 1371 goto err; 1372 } 1373 1374 /* 1375 * kssl_ctx->keytab_file == NULL ==> use Kerberos default 1376 */ 1377 if (kssl_ctx->keytab_file) { 1378 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1379 &krb5keytab); 1380 if (krb5rc) { 1381 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1382 "krb5_kt_resolve() fails.\n"); 1383 goto err; 1384 } 1385 } else { 1386 krb5rc = krb5_kt_default(krb5context, &krb5keytab); 1387 if (krb5rc) { 1388 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 1389 "krb5_kt_default() fails.\n"); 1390 goto err; 1391 } 1392 } 1393 1394 /*- Actual Kerberos5 krb5_recvauth() has initial conversation here 1395 * o check KRB5_SENDAUTH_BADAUTHVERS 1396 * unless KRB5_RECVAUTH_SKIP_VERSION 1397 * o check KRB5_SENDAUTH_BADAPPLVERS 1398 * o send "0" msg if all OK 1399 */ 1400 1401 /*- 1402 * 20010411 was using AP_REQ instead of true KerberosWrapper 1403 * 1404 * if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context, 1405 * &krb5in_data, krb5server, krb5keytab, 1406 * &ap_option, &krb5ticket)) != 0) { Error } 1407 */ 1408 1409 p = (unsigned char *)indata->data; 1410 if ((asn1ticket = (KRB5_TKTBODY *)d2i_KRB5_TICKET(NULL, &p, 1411 (long)indata->length)) 1412 == NULL) { 1413 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1414 "d2i_KRB5_TICKET() ASN.1 decode failure.\n"); 1415 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1416 goto err; 1417 } 1418 1419 /* 1420 * Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) 1421 */ 1422 if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket, 1423 kssl_err)) != 0) { 1424 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1425 "Error converting ASN.1 ticket to krb5_ticket.\n"); 1426 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1427 goto err; 1428 } 1429 1430 if (!krb5_principal_compare(krb5context, krb5server, krb5ticket->server)) { 1431 krb5rc = KRB5_PRINC_NOMATCH; 1432 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1433 "server principal != ticket principal\n"); 1434 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1435 goto err; 1436 } 1437 if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 1438 krb5ticket->server, 1439 krb5ticket->enc_part.kvno, 1440 krb5ticket->enc_part.enctype, 1441 &kt_entry)) != 0) { 1442 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1443 "krb5_kt_get_entry() fails with %x.\n", krb5rc); 1444 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1445 goto err; 1446 } 1447 if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key, 1448 krb5ticket)) != 0) { 1449 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, 1450 "krb5_decrypt_tkt_part() failed.\n"); 1451 kssl_err->reason = SSL_R_KRB5_S_RD_REQ; 1452 goto err; 1453 } else { 1454 krb5_kt_free_entry(krb5context, &kt_entry); 1455# ifdef KSSL_DEBUG 1456 { 1457 int i; 1458 krb5_address **paddr = krb5ticket->enc_part2->caddrs; 1459 fprintf(stderr, "Decrypted ticket fields:\n"); 1460 fprintf(stderr, "\tflags: %X, transit-type: %X", 1461 krb5ticket->enc_part2->flags, 1462 krb5ticket->enc_part2->transited.tr_type); 1463 print_krb5_data("\ttransit-data: ", 1464 &(krb5ticket->enc_part2->transited.tr_contents)); 1465 fprintf(stderr, "\tcaddrs: %p, authdata: %p\n", 1466 krb5ticket->enc_part2->caddrs, 1467 krb5ticket->enc_part2->authorization_data); 1468 if (paddr) { 1469 fprintf(stderr, "\tcaddrs:\n"); 1470 for (i = 0; paddr[i] != NULL; i++) { 1471 krb5_data d; 1472 d.length = paddr[i]->length; 1473 d.data = paddr[i]->contents; 1474 print_krb5_data("\t\tIP: ", &d); 1475 } 1476 } 1477 fprintf(stderr, "\tstart/auth/end times: %d / %d / %d\n", 1478 krb5ticket->enc_part2->times.starttime, 1479 krb5ticket->enc_part2->times.authtime, 1480 krb5ticket->enc_part2->times.endtime); 1481 } 1482# endif /* KSSL_DEBUG */ 1483 } 1484 1485 krb5rc = KRB5_NO_TKT_SUPPLIED; 1486 if (!krb5ticket || !krb5ticket->enc_part2 || 1487 !krb5ticket->enc_part2->client || 1488 !krb5ticket->enc_part2->client->data || 1489 !krb5ticket->enc_part2->session) { 1490 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1491 "bad ticket from krb5_rd_req.\n"); 1492 } else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT, 1493 &krb5ticket->enc_part2->client->realm, 1494 krb5ticket->enc_part2->client->data, 1495 krb5ticket->enc_part2->client->length)) { 1496 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1497 "kssl_ctx_setprinc() fails.\n"); 1498 } else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session)) { 1499 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1500 "kssl_ctx_setkey() fails.\n"); 1501 } else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID) { 1502 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID; 1503 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET, 1504 "invalid ticket from krb5_rd_req.\n"); 1505 } else 1506 krb5rc = 0; 1507 1508 kssl_ctx->enctype = krb5ticket->enc_part.enctype; 1509 ttimes->authtime = krb5ticket->enc_part2->times.authtime; 1510 ttimes->starttime = krb5ticket->enc_part2->times.starttime; 1511 ttimes->endtime = krb5ticket->enc_part2->times.endtime; 1512 ttimes->renew_till = krb5ticket->enc_part2->times.renew_till; 1513 1514 err: 1515# ifdef KSSL_DEBUG 1516 kssl_ctx_show(kssl_ctx); 1517# endif /* KSSL_DEBUG */ 1518 1519 if (asn1ticket) 1520 KRB5_TICKET_free((KRB5_TICKET *) asn1ticket); 1521 if (krb5keytab) 1522 krb5_kt_close(krb5context, krb5keytab); 1523 if (krb5ticket) 1524 krb5_free_ticket(krb5context, krb5ticket); 1525 if (krb5server) 1526 krb5_free_principal(krb5context, krb5server); 1527 return (krb5rc); 1528} 1529 1530/* 1531 * Allocate & return a new kssl_ctx struct. 1532 */ 1533KSSL_CTX *kssl_ctx_new(void) 1534{ 1535 return ((KSSL_CTX *)kssl_calloc(1, sizeof(KSSL_CTX))); 1536} 1537 1538/* 1539 * Frees a kssl_ctx struct and any allocated memory it holds. Returns NULL. 1540 */ 1541KSSL_CTX *kssl_ctx_free(KSSL_CTX *kssl_ctx) 1542{ 1543 if (kssl_ctx == NULL) 1544 return kssl_ctx; 1545 1546 if (kssl_ctx->key) 1547 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length); 1548 if (kssl_ctx->key) 1549 kssl_free(kssl_ctx->key); 1550 if (kssl_ctx->client_princ) 1551 kssl_free(kssl_ctx->client_princ); 1552 if (kssl_ctx->service_host) 1553 kssl_free(kssl_ctx->service_host); 1554 if (kssl_ctx->service_name) 1555 kssl_free(kssl_ctx->service_name); 1556 if (kssl_ctx->keytab_file) 1557 kssl_free(kssl_ctx->keytab_file); 1558 1559 kssl_free(kssl_ctx); 1560 return (KSSL_CTX *)NULL; 1561} 1562 1563/* 1564 * Given an array of (krb5_data *) entity (and optional realm), set the plain 1565 * (char *) client_princ or service_host member of the kssl_ctx struct. 1566 */ 1567krb5_error_code 1568kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which, 1569 krb5_data *realm, krb5_data *entity, int nentities) 1570{ 1571 char **princ; 1572 int length; 1573 int i; 1574 1575 if (kssl_ctx == NULL || entity == NULL) 1576 return KSSL_CTX_ERR; 1577 1578 switch (which) { 1579 case KSSL_CLIENT: 1580 princ = &kssl_ctx->client_princ; 1581 break; 1582 case KSSL_SERVER: 1583 princ = &kssl_ctx->service_host; 1584 break; 1585 default: 1586 return KSSL_CTX_ERR; 1587 break; 1588 } 1589 if (*princ) 1590 kssl_free(*princ); 1591 1592 /* Add up all the entity->lengths */ 1593 length = 0; 1594 for (i = 0; i < nentities; i++) { 1595 length += entity[i].length; 1596 } 1597 /* Add in space for the '/' character(s) (if any) */ 1598 length += nentities - 1; 1599 /* Space for the ('@'+realm+NULL | NULL) */ 1600 length += ((realm) ? realm->length + 2 : 1); 1601 1602 if ((*princ = kssl_calloc(1, length)) == NULL) 1603 return KSSL_CTX_ERR; 1604 else { 1605 for (i = 0; i < nentities; i++) { 1606 strncat(*princ, entity[i].data, entity[i].length); 1607 if (i < nentities - 1) { 1608 strcat(*princ, "/"); 1609 } 1610 } 1611 if (realm) { 1612 strcat(*princ, "@"); 1613 (void)strncat(*princ, realm->data, realm->length); 1614 } 1615 } 1616 1617 return KSSL_CTX_OK; 1618} 1619 1620/*- Set one of the plain (char *) string members of the kssl_ctx struct. 1621 * Default values should be: 1622 * which == KSSL_SERVICE => "khost" (KRB5SVC) 1623 * which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB) 1624 */ 1625krb5_error_code kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text) 1626{ 1627 char **string; 1628 1629 if (!kssl_ctx) 1630 return KSSL_CTX_ERR; 1631 1632 switch (which) { 1633 case KSSL_SERVICE: 1634 string = &kssl_ctx->service_name; 1635 break; 1636 case KSSL_SERVER: 1637 string = &kssl_ctx->service_host; 1638 break; 1639 case KSSL_CLIENT: 1640 string = &kssl_ctx->client_princ; 1641 break; 1642 case KSSL_KEYTAB: 1643 string = &kssl_ctx->keytab_file; 1644 break; 1645 default: 1646 return KSSL_CTX_ERR; 1647 break; 1648 } 1649 if (*string) 1650 kssl_free(*string); 1651 1652 if (!text) { 1653 *string = '\0'; 1654 return KSSL_CTX_OK; 1655 } 1656 1657 if ((*string = kssl_calloc(1, strlen(text) + 1)) == NULL) 1658 return KSSL_CTX_ERR; 1659 else 1660 strcpy(*string, text); 1661 1662 return KSSL_CTX_OK; 1663} 1664 1665/* 1666 * Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx 1667 * struct. Clear kssl_ctx->key if Kerberos session key is NULL. 1668 */ 1669krb5_error_code kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session) 1670{ 1671 int length; 1672 krb5_enctype enctype; 1673 krb5_octet FAR *contents = NULL; 1674 1675 if (!kssl_ctx) 1676 return KSSL_CTX_ERR; 1677 1678 if (kssl_ctx->key) { 1679 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length); 1680 kssl_free(kssl_ctx->key); 1681 } 1682 1683 if (session) { 1684 1685# ifdef KRB5_HEIMDAL 1686 length = session->keyvalue->length; 1687 enctype = session->keytype; 1688 contents = session->keyvalue->contents; 1689# else 1690 length = session->length; 1691 enctype = session->enctype; 1692 contents = session->contents; 1693# endif 1694 kssl_ctx->enctype = enctype; 1695 kssl_ctx->length = length; 1696 } else { 1697 kssl_ctx->enctype = ENCTYPE_UNKNOWN; 1698 kssl_ctx->length = 0; 1699 return KSSL_CTX_OK; 1700 } 1701 1702 if ((kssl_ctx->key = 1703 (krb5_octet FAR *)kssl_calloc(1, kssl_ctx->length)) == NULL) { 1704 kssl_ctx->length = 0; 1705 return KSSL_CTX_ERR; 1706 } else 1707 memcpy(kssl_ctx->key, contents, length); 1708 1709 return KSSL_CTX_OK; 1710} 1711 1712/* 1713 * Display contents of kssl_ctx struct 1714 */ 1715void kssl_ctx_show(KSSL_CTX *kssl_ctx) 1716{ 1717 int i; 1718 1719 printf("kssl_ctx: "); 1720 if (kssl_ctx == NULL) { 1721 printf("NULL\n"); 1722 return; 1723 } else 1724 printf("%p\n", (void *)kssl_ctx); 1725 1726 printf("\tservice:\t%s\n", 1727 (kssl_ctx->service_name) ? kssl_ctx->service_name : "NULL"); 1728 printf("\tclient:\t%s\n", 1729 (kssl_ctx->client_princ) ? kssl_ctx->client_princ : "NULL"); 1730 printf("\tserver:\t%s\n", 1731 (kssl_ctx->service_host) ? kssl_ctx->service_host : "NULL"); 1732 printf("\tkeytab:\t%s\n", 1733 (kssl_ctx->keytab_file) ? kssl_ctx->keytab_file : "NULL"); 1734 printf("\tkey [%d:%d]:\t", kssl_ctx->enctype, kssl_ctx->length); 1735 1736 for (i = 0; i < kssl_ctx->length && kssl_ctx->key; i++) { 1737 printf("%02x", kssl_ctx->key[i]); 1738 } 1739 printf("\n"); 1740 return; 1741} 1742 1743int kssl_keytab_is_available(KSSL_CTX *kssl_ctx) 1744{ 1745 krb5_context krb5context = NULL; 1746 krb5_keytab krb5keytab = NULL; 1747 krb5_keytab_entry entry; 1748 krb5_principal princ = NULL; 1749 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1750 int rc = 0; 1751 1752 if ((krb5rc = krb5_init_context(&krb5context))) 1753 return (0); 1754 1755 /* 1756 * kssl_ctx->keytab_file == NULL ==> use Kerberos default 1757 */ 1758 if (kssl_ctx->keytab_file) { 1759 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file, 1760 &krb5keytab); 1761 if (krb5rc) 1762 goto exit; 1763 } else { 1764 krb5rc = krb5_kt_default(krb5context, &krb5keytab); 1765 if (krb5rc) 1766 goto exit; 1767 } 1768 1769 /* the host key we are looking for */ 1770 krb5rc = krb5_sname_to_principal(krb5context, NULL, 1771 kssl_ctx-> 1772 service_name ? kssl_ctx->service_name : 1773 KRB5SVC, KRB5_NT_SRV_HST, &princ); 1774 1775 if (krb5rc) 1776 goto exit; 1777 1778 krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, princ, 1779 /* IGNORE_VNO */ 1780 0, 1781 /* IGNORE_ENCTYPE */ 1782 0, &entry); 1783 if (krb5rc == KRB5_KT_NOTFOUND) { 1784 rc = 1; 1785 goto exit; 1786 } else if (krb5rc) 1787 goto exit; 1788 1789 krb5_kt_free_entry(krb5context, &entry); 1790 rc = 1; 1791 1792 exit: 1793 if (krb5keytab) 1794 krb5_kt_close(krb5context, krb5keytab); 1795 if (princ) 1796 krb5_free_principal(krb5context, princ); 1797 if (krb5context) 1798 krb5_free_context(krb5context); 1799 return (rc); 1800} 1801 1802int kssl_tgt_is_available(KSSL_CTX *kssl_ctx) 1803{ 1804 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC; 1805 krb5_context krb5context = NULL; 1806 krb5_ccache krb5ccdef = NULL; 1807 krb5_creds krb5creds, *krb5credsp = NULL; 1808 int rc = 0; 1809 1810 memset((char *)&krb5creds, 0, sizeof(krb5creds)); 1811 1812 if (!kssl_ctx) 1813 return (0); 1814 1815 if (!kssl_ctx->service_host) 1816 return (0); 1817 1818 if ((krb5rc = krb5_init_context(&krb5context)) != 0) 1819 goto err; 1820 1821 if ((krb5rc = krb5_sname_to_principal(krb5context, 1822 kssl_ctx->service_host, 1823 (kssl_ctx->service_name) ? 1824 kssl_ctx->service_name : KRB5SVC, 1825 KRB5_NT_SRV_HST, 1826 &krb5creds.server)) != 0) 1827 goto err; 1828 1829 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) 1830 goto err; 1831 1832 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef, 1833 &krb5creds.client)) != 0) 1834 goto err; 1835 1836 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef, 1837 &krb5creds, &krb5credsp)) != 0) 1838 goto err; 1839 1840 rc = 1; 1841 1842 err: 1843# ifdef KSSL_DEBUG 1844 kssl_ctx_show(kssl_ctx); 1845# endif /* KSSL_DEBUG */ 1846 1847 if (krb5creds.client) 1848 krb5_free_principal(krb5context, krb5creds.client); 1849 if (krb5creds.server) 1850 krb5_free_principal(krb5context, krb5creds.server); 1851 if (krb5context) 1852 krb5_free_context(krb5context); 1853 return (rc); 1854} 1855 1856# if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32) 1857void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data) 1858{ 1859# ifdef KRB5_HEIMDAL 1860 data->length = 0; 1861 if (data->data) 1862 free(data->data); 1863# elif defined(KRB5_MIT_OLD11) 1864 if (data->data) { 1865 krb5_xfree(data->data); 1866 data->data = 0; 1867 } 1868# else 1869 krb5_free_data_contents(NULL, data); 1870# endif 1871} 1872# endif 1873/* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */ 1874 1875/* 1876 * Given pointers to KerberosTime and struct tm structs, convert the 1877 * KerberosTime string to struct tm. Note that KerberosTime is a 1878 * ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional seconds 1879 * as defined in RFC 1510. Return pointer to the (partially) filled in 1880 * struct tm on success, return NULL on failure. 1881 */ 1882static struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm) 1883{ 1884 char c, *p; 1885 1886 if (!k_tm) 1887 return NULL; 1888 if (gtime == NULL || gtime->length < 14) 1889 return NULL; 1890 if (gtime->data == NULL) 1891 return NULL; 1892 1893 p = (char *)>ime->data[14]; 1894 1895 c = *p; 1896 *p = '\0'; 1897 p -= 2; 1898 k_tm->tm_sec = atoi(p); 1899 *(p + 2) = c; 1900 c = *p; 1901 *p = '\0'; 1902 p -= 2; 1903 k_tm->tm_min = atoi(p); 1904 *(p + 2) = c; 1905 c = *p; 1906 *p = '\0'; 1907 p -= 2; 1908 k_tm->tm_hour = atoi(p); 1909 *(p + 2) = c; 1910 c = *p; 1911 *p = '\0'; 1912 p -= 2; 1913 k_tm->tm_mday = atoi(p); 1914 *(p + 2) = c; 1915 c = *p; 1916 *p = '\0'; 1917 p -= 2; 1918 k_tm->tm_mon = atoi(p) - 1; 1919 *(p + 2) = c; 1920 c = *p; 1921 *p = '\0'; 1922 p -= 4; 1923 k_tm->tm_year = atoi(p) - 1900; 1924 *(p + 4) = c; 1925 1926 return k_tm; 1927} 1928 1929/* 1930 * Helper function for kssl_validate_times(). We need context->clockskew, 1931 * but krb5_context is an opaque struct. So we try to sneek the clockskew 1932 * out through the replay cache. If that fails just return a likely default 1933 * (300 seconds). 1934 */ 1935static krb5_deltat get_rc_clockskew(krb5_context context) 1936{ 1937 krb5_rcache rc; 1938 krb5_deltat clockskew; 1939 1940 if (krb5_rc_default(context, &rc)) 1941 return KSSL_CLOCKSKEW; 1942 if (krb5_rc_initialize(context, rc, 0)) 1943 return KSSL_CLOCKSKEW; 1944 if (krb5_rc_get_lifespan(context, rc, &clockskew)) { 1945 clockskew = KSSL_CLOCKSKEW; 1946 } 1947 (void)krb5_rc_destroy(context, rc); 1948 return clockskew; 1949} 1950 1951/* 1952 * kssl_validate_times() combines (and more importantly exposes) the MIT KRB5 1953 * internal function krb5_validate_times() and the in_clock_skew() macro. 1954 * The authenticator client time is checked to be within clockskew secs of 1955 * the current time and the current time is checked to be within the ticket 1956 * start and expire times. Either check may be omitted by supplying a NULL 1957 * value. Returns 0 for valid times, SSL_R_KRB5* error codes otherwise. See 1958 * Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c 20010420 VRS 1959 */ 1960krb5_error_code kssl_validate_times(krb5_timestamp atime, 1961 krb5_ticket_times *ttimes) 1962{ 1963 krb5_deltat skew; 1964 krb5_timestamp start, now; 1965 krb5_error_code rc; 1966 krb5_context context; 1967 1968 if ((rc = krb5_init_context(&context))) 1969 return SSL_R_KRB5_S_BAD_TICKET; 1970 skew = get_rc_clockskew(context); 1971 if ((rc = krb5_timeofday(context, &now))) 1972 return SSL_R_KRB5_S_BAD_TICKET; 1973 krb5_free_context(context); 1974 1975 if (atime && labs(atime - now) >= skew) 1976 return SSL_R_KRB5_S_TKT_SKEW; 1977 1978 if (!ttimes) 1979 return 0; 1980 1981 start = (ttimes->starttime != 0) ? ttimes->starttime : ttimes->authtime; 1982 if (start - now > skew) 1983 return SSL_R_KRB5_S_TKT_NYV; 1984 if ((now - ttimes->endtime) > skew) 1985 return SSL_R_KRB5_S_TKT_EXPIRED; 1986 1987# ifdef KSSL_DEBUG 1988 fprintf(stderr, "kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n", 1989 start, atime, now, skew, ttimes->endtime); 1990# endif /* KSSL_DEBUG */ 1991 1992 return 0; 1993} 1994 1995/* 1996 * Decode and decrypt given DER-encoded authenticator, then pass 1997 * authenticator ctime back in *atimep (or 0 if time unavailable). Returns 1998 * krb5_error_code and kssl_err on error. A NULL authenticator 1999 * (authentp->length == 0) is not considered an error. Note that 2000 * kssl_check_authent() makes use of the KRB5 session key; you must call 2001 * kssl_sget_tkt() to get the key before calling this routine. 2002 */ 2003krb5_error_code kssl_check_authent( 2004 /* 2005 * IN 2006 */ KSSL_CTX *kssl_ctx, 2007 /* 2008 * IN 2009 */ krb5_data *authentp, 2010 /* 2011 * OUT 2012 */ krb5_timestamp *atimep, 2013 /* 2014 * OUT 2015 */ KSSL_ERR *kssl_err) 2016{ 2017 krb5_error_code krb5rc = 0; 2018 KRB5_ENCDATA *dec_authent = NULL; 2019 KRB5_AUTHENTBODY *auth = NULL; 2020 krb5_enctype enctype; 2021 EVP_CIPHER_CTX ciph_ctx; 2022 const EVP_CIPHER *enc = NULL; 2023 unsigned char iv[EVP_MAX_IV_LENGTH]; 2024 const unsigned char *p; 2025 unsigned char *unenc_authent; 2026 int outl, unencbufsize; 2027 struct tm tm_time, *tm_l, *tm_g; 2028 time_t now, tl, tg, tr, tz_offset; 2029 2030 EVP_CIPHER_CTX_init(&ciph_ctx); 2031 *atimep = 0; 2032 kssl_err_set(kssl_err, 0, ""); 2033 2034# ifndef KRB5CHECKAUTH 2035 authentp = NULL; 2036# else 2037# if KRB5CHECKAUTH == 0 2038 authentp = NULL; 2039# endif 2040# endif /* KRB5CHECKAUTH */ 2041 2042 if (authentp == NULL || authentp->length == 0) 2043 return 0; 2044 2045# ifdef KSSL_DEBUG 2046 { 2047 unsigned int ui; 2048 fprintf(stderr, "kssl_check_authent: authenticator[%d]:\n", 2049 authentp->length); 2050 p = authentp->data; 2051 for (ui = 0; ui < authentp->length; ui++) 2052 fprintf(stderr, "%02x ", p[ui]); 2053 fprintf(stderr, "\n"); 2054 } 2055# endif /* KSSL_DEBUG */ 2056 2057 unencbufsize = 2 * authentp->length; 2058 if ((unenc_authent = calloc(1, unencbufsize)) == NULL) { 2059 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2060 "Unable to allocate authenticator buffer.\n"); 2061 krb5rc = KRB5KRB_ERR_GENERIC; 2062 goto err; 2063 } 2064 2065 p = (unsigned char *)authentp->data; 2066 if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p, 2067 (long)authentp->length)) == NULL) { 2068 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2069 "Error decoding authenticator.\n"); 2070 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2071 goto err; 2072 } 2073 2074 enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */ 2075# if !defined(KRB5_MIT_OLD11) 2076 switch (enctype) { 2077 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */ 2078 case ENCTYPE_DES3_CBC_SHA: 2079 case ENCTYPE_DES3_CBC_RAW: 2080 krb5rc = 0; /* Skip, can't handle derived keys */ 2081 goto err; 2082 } 2083# endif 2084 enc = kssl_map_enc(enctype); 2085 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2086 2087 if (enc == NULL) { 2088 /* 2089 * Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1. This 2090 * enctype indicates the authenticator was encrypted using key-usage 2091 * derived keys which openssl cannot decrypt. 2092 */ 2093 goto err; 2094 } 2095 2096 if (!EVP_CipherInit(&ciph_ctx, enc, kssl_ctx->key, iv, 0)) { 2097 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2098 "EVP_CipherInit error decrypting authenticator.\n"); 2099 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2100 goto err; 2101 } 2102 outl = dec_authent->cipher->length; 2103 if (!EVP_Cipher 2104 (&ciph_ctx, unenc_authent, dec_authent->cipher->data, outl)) { 2105 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2106 "EVP_Cipher error decrypting authenticator.\n"); 2107 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2108 goto err; 2109 } 2110 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2111 2112# ifdef KSSL_DEBUG 2113 { 2114 int padl; 2115 fprintf(stderr, "kssl_check_authent: decrypted authenticator[%d] =\n", 2116 outl); 2117 for (padl = 0; padl < outl; padl++) 2118 fprintf(stderr, "%02x ", unenc_authent[padl]); 2119 fprintf(stderr, "\n"); 2120 } 2121# endif /* KSSL_DEBUG */ 2122 2123 if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL) { 2124 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2125 "confounded by authenticator.\n"); 2126 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2127 goto err; 2128 } 2129 outl -= p - unenc_authent; 2130 2131 if ((auth = (KRB5_AUTHENTBODY *)d2i_KRB5_AUTHENT(NULL, &p, 2132 (long)outl)) == NULL) { 2133 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 2134 "Error decoding authenticator body.\n"); 2135 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY; 2136 goto err; 2137 } 2138 2139 memset(&tm_time, 0, sizeof(struct tm)); 2140 if (k_gmtime(auth->ctime, &tm_time) && 2141 ((tr = mktime(&tm_time)) != (time_t)(-1))) { 2142 now = time(&now); 2143 tm_l = localtime(&now); 2144 tl = mktime(tm_l); 2145 tm_g = gmtime(&now); 2146 tg = mktime(tm_g); 2147 tz_offset = tg - tl; 2148 2149 *atimep = (krb5_timestamp)(tr - tz_offset); 2150 } 2151# ifdef KSSL_DEBUG 2152 fprintf(stderr, "kssl_check_authent: returns %d for client time ", 2153 *atimep); 2154 if (auth && auth->ctime && auth->ctime->length && auth->ctime->data) 2155 fprintf(stderr, "%.*s\n", auth->ctime->length, auth->ctime->data); 2156 else 2157 fprintf(stderr, "NULL\n"); 2158# endif /* KSSL_DEBUG */ 2159 2160 err: 2161 if (auth) 2162 KRB5_AUTHENT_free((KRB5_AUTHENT *) auth); 2163 if (dec_authent) 2164 KRB5_ENCDATA_free(dec_authent); 2165 if (unenc_authent) 2166 free(unenc_authent); 2167 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2168 return krb5rc; 2169} 2170 2171/* 2172 * Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host), 2173 * because I don't know how to stub varargs. Returns krb5_error_code == 2174 * ENOMEM on alloc error, otherwise passes back newly constructed principal, 2175 * which should be freed by caller. 2176 */ 2177krb5_error_code kssl_build_principal_2( 2178 /* 2179 * UPDATE 2180 */ krb5_context context, 2181 /* 2182 * OUT 2183 */ krb5_principal *princ, 2184 /* 2185 * IN 2186 */ int rlen, const char *realm, 2187 /* 2188 * IN 2189 */ int slen, const char *svc, 2190 /* 2191 * IN 2192 */ int hlen, const char *host) 2193{ 2194 krb5_data *p_data = NULL; 2195 krb5_principal new_p = NULL; 2196 char *new_r = NULL; 2197 2198 if ((p_data = (krb5_data *)calloc(2, sizeof(krb5_data))) == NULL || 2199 (new_p = (krb5_principal)calloc(1, sizeof(krb5_principal_data))) 2200 == NULL) 2201 goto err; 2202 new_p->length = 2; 2203 new_p->data = p_data; 2204 2205 if ((new_r = calloc(1, rlen + 1)) == NULL) 2206 goto err; 2207 memcpy(new_r, realm, rlen); 2208 krb5_princ_set_realm_length(context, new_p, rlen); 2209 krb5_princ_set_realm_data(context, new_p, new_r); 2210 2211 if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) 2212 goto err; 2213 memcpy(new_p->data[0].data, svc, slen); 2214 new_p->data[0].length = slen; 2215 2216 if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) 2217 goto err; 2218 memcpy(new_p->data[1].data, host, hlen); 2219 new_p->data[1].length = hlen; 2220 2221 krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN; 2222 *princ = new_p; 2223 return 0; 2224 2225 err: 2226 if (new_p && new_p[0].data) 2227 free(new_p[0].data); 2228 if (new_p && new_p[1].data) 2229 free(new_p[1].data); 2230 if (new_p) 2231 free(new_p); 2232 if (new_r) 2233 free(new_r); 2234 return ENOMEM; 2235} 2236 2237void SSL_set0_kssl_ctx(SSL *s, KSSL_CTX *kctx) 2238{ 2239 s->kssl_ctx = kctx; 2240} 2241 2242KSSL_CTX *SSL_get0_kssl_ctx(SSL *s) 2243{ 2244 return s->kssl_ctx; 2245} 2246 2247char *kssl_ctx_get0_client_princ(KSSL_CTX *kctx) 2248{ 2249 if (kctx) 2250 return kctx->client_princ; 2251 return NULL; 2252} 2253 2254#else /* !OPENSSL_NO_KRB5 */ 2255 2256# if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS) 2257static void *dummy = &dummy; 2258# endif 2259 2260#endif /* !OPENSSL_NO_KRB5 */ 2261