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 #include "kssl_lcl.h"
80
81 #ifndef OPENSSL_NO_KRB5
82
83 #ifndef ENOMEM
84 #define ENOMEM KRB5KRB_ERR_GENERIC
85 #endif
86
87 /*
88 * When OpenSSL is built on Windows, we do not want to require that
89 * the Kerberos DLLs be available in order for the OpenSSL DLLs to
90 * work. Therefore, all Kerberos routines are loaded at run time
91 * and we do not link to a .LIB file.
92 */
93
94 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
95 /*
96 * The purpose of the following pre-processor statements is to provide
97 * compatibility with different releases of MIT Kerberos for Windows.
98 * All versions up to 1.2 used macros. But macros do not allow for
99 * a binary compatible interface for DLLs. Therefore, all macros are
100 * being replaced by function calls. The following code will allow
101 * an OpenSSL DLL built on Windows to work whether or not the macro
102 * or function form of the routines are utilized.
103 */
104 #ifdef krb5_cc_get_principal
105 #define NO_DEF_KRB5_CCACHE
106 #undef krb5_cc_get_principal
107 #endif
108 #define krb5_cc_get_principal kssl_krb5_cc_get_principal
109
110 #define krb5_free_data_contents kssl_krb5_free_data_contents
111 #define krb5_free_context kssl_krb5_free_context
112 #define krb5_auth_con_free kssl_krb5_auth_con_free
113 #define krb5_free_principal kssl_krb5_free_principal
114 #define krb5_mk_req_extended kssl_krb5_mk_req_extended
115 #define krb5_get_credentials kssl_krb5_get_credentials
116 #define krb5_cc_default kssl_krb5_cc_default
117 #define krb5_sname_to_principal kssl_krb5_sname_to_principal
118 #define krb5_init_context kssl_krb5_init_context
119 #define krb5_free_ticket kssl_krb5_free_ticket
120 #define krb5_rd_req kssl_krb5_rd_req
121 #define krb5_kt_default kssl_krb5_kt_default
122 #define krb5_kt_resolve kssl_krb5_kt_resolve
123 /* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */
124 #ifndef krb5_kt_close
125 #define krb5_kt_close kssl_krb5_kt_close
126 #endif /* krb5_kt_close */
127 #ifndef krb5_kt_get_entry
128 #define krb5_kt_get_entry kssl_krb5_kt_get_entry
129 #endif /* krb5_kt_get_entry */
130 #define krb5_auth_con_init kssl_krb5_auth_con_init
131
132 #define krb5_principal_compare kssl_krb5_principal_compare
133 #define krb5_decrypt_tkt_part kssl_krb5_decrypt_tkt_part
134 #define krb5_timeofday kssl_krb5_timeofday
135 #define krb5_rc_default kssl_krb5_rc_default
136
137 #ifdef krb5_rc_initialize
138 #undef krb5_rc_initialize
139 #endif
140 #define krb5_rc_initialize kssl_krb5_rc_initialize
141
142 #ifdef krb5_rc_get_lifespan
143 #undef krb5_rc_get_lifespan
144 #endif
145 #define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
146
147 #ifdef krb5_rc_destroy
148 #undef krb5_rc_destroy
149 #endif
150 #define krb5_rc_destroy kssl_krb5_rc_destroy
151
152 #define valid_cksumtype kssl_valid_cksumtype
153 #define krb5_checksum_size kssl_krb5_checksum_size
154 #define krb5_kt_free_entry kssl_krb5_kt_free_entry
155 #define krb5_auth_con_setrcache kssl_krb5_auth_con_setrcache
156 #define krb5_auth_con_getrcache kssl_krb5_auth_con_getrcache
157 #define krb5_get_server_rcache kssl_krb5_get_server_rcache
158
159 /* Prototypes for built in stubs */
160 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
161 void kssl_krb5_free_principal(krb5_context, krb5_principal );
162 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
163 krb5_const char *,
164 krb5_keytab *);
165 krb5_error_code kssl_krb5_kt_default(krb5_context,
166 krb5_keytab *);
167 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
168 krb5_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
173 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
174 krb5_const_principal);
175 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
176 krb5_auth_context *,
177 krb5_const krb5_flags,
178 krb5_data *,
179 krb5_creds *,
180 krb5_data * );
181 krb5_error_code kssl_krb5_init_context(krb5_context *);
182 void kssl_krb5_free_context(krb5_context);
183 krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache *);
184 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
185 krb5_const char *,
186 krb5_const char *,
187 krb5_int32,
188 krb5_principal *);
189 krb5_error_code kssl_krb5_get_credentials(krb5_context,
190 krb5_const krb5_flags,
191 krb5_ccache,
192 krb5_creds *,
193 krb5_creds * *);
194 krb5_error_code kssl_krb5_auth_con_init(krb5_context,
195 krb5_auth_context *);
196 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context,
197 krb5_ccache cache,
198 krb5_principal *principal);
199 krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
200 size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
201 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
202 krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
203 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context,
204 krb5_auth_context,
205 krb5_rcache);
206 krb5_error_code kssl_krb5_get_server_rcache(krb5_context,
207 krb5_const krb5_data *,
208 krb5_rcache *);
209 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context,
210 krb5_auth_context,
211 krb5_rcache *);
212
213 /* Function pointers (almost all Kerberos functions are _stdcall) */
214 static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
215 =NULL;
216 static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
217 =NULL;
218 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
219 (krb5_context, krb5_const char *, krb5_keytab *)=NULL;
220 static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
221 krb5_keytab *)=NULL;
222 static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context,
223 krb5_ticket *)=NULL;
224 static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context,
225 krb5_auth_context *,
226 krb5_const krb5_data *,
227 krb5_const_principal,
228 krb5_keytab, krb5_flags *,
229 krb5_ticket **)=NULL;
230 static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
231 (krb5_context, krb5_auth_context *,
232 krb5_const krb5_flags, krb5_data *, krb5_creds *,
233 krb5_data * )=NULL;
234 static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
235 static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
236 static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
237 krb5_ccache *)=NULL;
238 static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
239 (krb5_context, krb5_const char *, krb5_const char *,
240 krb5_int32, krb5_principal *)=NULL;
241 static krb5_error_code (_stdcall *p_krb5_get_credentials)
242 (krb5_context, krb5_const krb5_flags, krb5_ccache,
243 krb5_creds *, krb5_creds **)=NULL;
244 static krb5_error_code (_stdcall *p_krb5_auth_con_init)
245 (krb5_context, krb5_auth_context *)=NULL;
246 static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
247 (krb5_context context, krb5_ccache cache,
248 krb5_principal *principal)=NULL;
249 static krb5_error_code (_stdcall *p_krb5_auth_con_free)
250 (krb5_context, krb5_auth_context)=NULL;
251 static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
252 (krb5_context, krb5_const krb5_keyblock *,
253 krb5_ticket *)=NULL;
254 static krb5_error_code (_stdcall *p_krb5_timeofday)
255 (krb5_context context, krb5_int32 *timeret)=NULL;
256 static krb5_error_code (_stdcall *p_krb5_rc_default)
257 (krb5_context context, krb5_rcache *rc)=NULL;
258 static krb5_error_code (_stdcall *p_krb5_rc_initialize)
259 (krb5_context context, krb5_rcache rc,
260 krb5_deltat lifespan)=NULL;
261 static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
262 (krb5_context context, krb5_rcache rc,
263 krb5_deltat *lifespan)=NULL;
264 static krb5_error_code (_stdcall *p_krb5_rc_destroy)
265 (krb5_context context, krb5_rcache rc)=NULL;
266 static krb5_boolean (_stdcall *p_krb5_principal_compare)
267 (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
268 static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
269 static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
270 static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
271 (krb5_context,krb5_keytab_entry * )=NULL;
272 static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context,
273 krb5_auth_context,
274 krb5_rcache)=NULL;
275 static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context,
276 krb5_const krb5_data *,
277 krb5_rcache *)=NULL;
278 static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context,
279 krb5_auth_context,
280 krb5_rcache *)=NULL;
281 static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context,
282 krb5_keytab keytab)=NULL;
283 static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context,
284 krb5_keytab keytab,
285 krb5_const_principal principal, krb5_kvno vno,
286 krb5_enctype enctype, krb5_keytab_entry *entry)=NULL;
287 static int krb5_loaded = 0; /* only attempt to initialize func ptrs once */
288
289 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
290 void
291 load_krb5_dll(void)
292 {
293 HANDLE hKRB5_32;
294
295 krb5_loaded++;
296 hKRB5_32 = LoadLibrary(TEXT("KRB5_32"));
297 if (!hKRB5_32)
298 return;
299
300 (FARPROC) p_krb5_free_data_contents =
301 GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
302 (FARPROC) p_krb5_free_context =
303 GetProcAddress( hKRB5_32, "krb5_free_context" );
304 (FARPROC) p_krb5_auth_con_free =
305 GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
306 (FARPROC) p_krb5_free_principal =
307 GetProcAddress( hKRB5_32, "krb5_free_principal" );
308 (FARPROC) p_krb5_mk_req_extended =
309 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
310 (FARPROC) p_krb5_get_credentials =
311 GetProcAddress( hKRB5_32, "krb5_get_credentials" );
312 (FARPROC) p_krb5_cc_get_principal =
313 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
314 (FARPROC) p_krb5_cc_default =
315 GetProcAddress( hKRB5_32, "krb5_cc_default" );
316 (FARPROC) p_krb5_sname_to_principal =
317 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
318 (FARPROC) p_krb5_init_context =
319 GetProcAddress( hKRB5_32, "krb5_init_context" );
320 (FARPROC) p_krb5_free_ticket =
321 GetProcAddress( hKRB5_32, "krb5_free_ticket" );
322 (FARPROC) p_krb5_rd_req =
323 GetProcAddress( hKRB5_32, "krb5_rd_req" );
324 (FARPROC) p_krb5_principal_compare =
325 GetProcAddress( hKRB5_32, "krb5_principal_compare" );
326 (FARPROC) p_krb5_decrypt_tkt_part =
327 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
328 (FARPROC) p_krb5_timeofday =
329 GetProcAddress( hKRB5_32, "krb5_timeofday" );
330 (FARPROC) p_krb5_rc_default =
331 GetProcAddress( hKRB5_32, "krb5_rc_default" );
332 (FARPROC) p_krb5_rc_initialize =
333 GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
334 (FARPROC) p_krb5_rc_get_lifespan =
335 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
336 (FARPROC) p_krb5_rc_destroy =
337 GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
338 (FARPROC) p_krb5_kt_default =
339 GetProcAddress( hKRB5_32, "krb5_kt_default" );
340 (FARPROC) p_krb5_kt_resolve =
341 GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
342 (FARPROC) p_krb5_auth_con_init =
343 GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
344 (FARPROC) p_valid_cksumtype =
345 GetProcAddress( hKRB5_32, "valid_cksumtype" );
346 (FARPROC) p_krb5_checksum_size =
347 GetProcAddress( hKRB5_32, "krb5_checksum_size" );
348 (FARPROC) p_krb5_kt_free_entry =
349 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
350 (FARPROC) p_krb5_auth_con_setrcache =
351 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
352 (FARPROC) p_krb5_get_server_rcache =
353 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
354 (FARPROC) p_krb5_auth_con_getrcache =
355 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
356 (FARPROC) p_krb5_kt_close =
357 GetProcAddress( hKRB5_32, "krb5_kt_close" );
358 (FARPROC) p_krb5_kt_get_entry =
359 GetProcAddress( hKRB5_32, "krb5_kt_get_entry" );
360 }
361
362 /* Stubs for each function to be dynamicly loaded */
363 void
364 kssl_krb5_free_data_contents(krb5_context CO, krb5_data * data)
365 {
366 if (!krb5_loaded)
367 load_krb5_dll();
368
369 if ( p_krb5_free_data_contents )
370 p_krb5_free_data_contents(CO,data);
371 }
372
373 krb5_error_code
374 kssl_krb5_mk_req_extended (krb5_context CO,
375 krb5_auth_context * pACO,
376 krb5_const krb5_flags F,
377 krb5_data * pD1,
378 krb5_creds * pC,
379 krb5_data * pD2)
380 {
381 if (!krb5_loaded)
382 load_krb5_dll();
383
384 if ( p_krb5_mk_req_extended )
385 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
386 else
387 return KRB5KRB_ERR_GENERIC;
388 }
389 krb5_error_code
390 kssl_krb5_auth_con_init(krb5_context CO,
391 krb5_auth_context * pACO)
392 {
393 if (!krb5_loaded)
394 load_krb5_dll();
395
396 if ( p_krb5_auth_con_init )
397 return(p_krb5_auth_con_init(CO,pACO));
398 else
399 return KRB5KRB_ERR_GENERIC;
400 }
401 krb5_error_code
402 kssl_krb5_auth_con_free (krb5_context CO,
403 krb5_auth_context ACO)
404 {
405 if (!krb5_loaded)
406 load_krb5_dll();
407
408 if ( p_krb5_auth_con_free )
409 return(p_krb5_auth_con_free(CO,ACO));
410 else
411 return KRB5KRB_ERR_GENERIC;
412 }
413 krb5_error_code
414 kssl_krb5_get_credentials(krb5_context CO,
415 krb5_const krb5_flags F,
416 krb5_ccache CC,
417 krb5_creds * pCR,
418 krb5_creds ** ppCR)
419 {
420 if (!krb5_loaded)
421 load_krb5_dll();
422
423 if ( p_krb5_get_credentials )
424 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
425 else
426 return KRB5KRB_ERR_GENERIC;
427 }
428 krb5_error_code
429 kssl_krb5_sname_to_principal(krb5_context CO,
430 krb5_const char * pC1,
431 krb5_const char * pC2,
432 krb5_int32 I,
433 krb5_principal * pPR)
434 {
435 if (!krb5_loaded)
436 load_krb5_dll();
437
438 if ( p_krb5_sname_to_principal )
439 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
440 else
441 return KRB5KRB_ERR_GENERIC;
442 }
443
444 krb5_error_code
445 kssl_krb5_cc_default(krb5_context CO,
446 krb5_ccache * pCC)
447 {
448 if (!krb5_loaded)
449 load_krb5_dll();
450
451 if ( p_krb5_cc_default )
452 return(p_krb5_cc_default(CO,pCC));
453 else
454 return KRB5KRB_ERR_GENERIC;
455 }
456
457 krb5_error_code
458 kssl_krb5_init_context(krb5_context * pCO)
459 {
460 if (!krb5_loaded)
461 load_krb5_dll();
462
463 if ( p_krb5_init_context )
464 return(p_krb5_init_context(pCO));
465 else
466 return KRB5KRB_ERR_GENERIC;
467 }
468
469 void
470 kssl_krb5_free_context(krb5_context CO)
471 {
472 if (!krb5_loaded)
473 load_krb5_dll();
474
475 if ( p_krb5_free_context )
476 p_krb5_free_context(CO);
477 }
478
479 void
480 kssl_krb5_free_principal(krb5_context c, krb5_principal p)
481 {
482 if (!krb5_loaded)
483 load_krb5_dll();
484
485 if ( p_krb5_free_principal )
486 p_krb5_free_principal(c,p);
487 }
488
489 krb5_error_code
490 kssl_krb5_kt_resolve(krb5_context con,
491 krb5_const char * sz,
492 krb5_keytab * kt)
493 {
494 if (!krb5_loaded)
495 load_krb5_dll();
496
497 if ( p_krb5_kt_resolve )
498 return(p_krb5_kt_resolve(con,sz,kt));
499 else
500 return KRB5KRB_ERR_GENERIC;
501 }
502
503 krb5_error_code
504 kssl_krb5_kt_default(krb5_context con,
505 krb5_keytab * kt)
506 {
507 if (!krb5_loaded)
508 load_krb5_dll();
509
510 if ( p_krb5_kt_default )
511 return(p_krb5_kt_default(con,kt));
512 else
513 return KRB5KRB_ERR_GENERIC;
514 }
515
516 krb5_error_code
517 kssl_krb5_free_ticket(krb5_context con,
518 krb5_ticket * kt)
519 {
520 if (!krb5_loaded)
521 load_krb5_dll();
522
523 if ( p_krb5_free_ticket )
524 return(p_krb5_free_ticket(con,kt));
525 else
526 return KRB5KRB_ERR_GENERIC;
527 }
528
529 krb5_error_code
530 kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
531 krb5_const krb5_data * data,
532 krb5_const_principal princ, krb5_keytab keytab,
533 krb5_flags * flags, krb5_ticket ** pptkt)
534 {
535 if (!krb5_loaded)
536 load_krb5_dll();
537
538 if ( p_krb5_rd_req )
539 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
540 else
541 return KRB5KRB_ERR_GENERIC;
542 }
543
544 krb5_boolean
545 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
546 krb5_const_principal princ2)
547 {
548 if (!krb5_loaded)
549 load_krb5_dll();
550
551 if ( p_krb5_principal_compare )
552 return(p_krb5_principal_compare(con,princ1,princ2));
553 else
554 return KRB5KRB_ERR_GENERIC;
555 }
556
557 krb5_error_code
558 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
559 krb5_ticket *ticket)
560 {
561 if (!krb5_loaded)
562 load_krb5_dll();
563
564 if ( p_krb5_decrypt_tkt_part )
565 return(p_krb5_decrypt_tkt_part(con,keys,ticket));
566 else
567 return KRB5KRB_ERR_GENERIC;
568 }
569
570 krb5_error_code
571 krb5_timeofday(krb5_context con, krb5_int32 *timeret)
572 {
573 if (!krb5_loaded)
574 load_krb5_dll();
575
576 if ( p_krb5_timeofday )
577 return(p_krb5_timeofday(con,timeret));
578 else
579 return KRB5KRB_ERR_GENERIC;
580 }
581
582 krb5_error_code
583 krb5_rc_default(krb5_context con, krb5_rcache *rc)
584 {
585 if (!krb5_loaded)
586 load_krb5_dll();
587
588 if ( p_krb5_rc_default )
589 return(p_krb5_rc_default(con,rc));
590 else
591 return KRB5KRB_ERR_GENERIC;
592 }
593
594 krb5_error_code
595 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
596 {
597 if (!krb5_loaded)
598 load_krb5_dll();
599
600 if ( p_krb5_rc_initialize )
601 return(p_krb5_rc_initialize(con, rc, lifespan));
602 else
603 return KRB5KRB_ERR_GENERIC;
604 }
605
606 krb5_error_code
607 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
608 {
609 if (!krb5_loaded)
610 load_krb5_dll();
611
612 if ( p_krb5_rc_get_lifespan )
613 return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
614 else
615 return KRB5KRB_ERR_GENERIC;
616 }
617
618 krb5_error_code
619 krb5_rc_destroy(krb5_context con, krb5_rcache rc)
620 {
621 if (!krb5_loaded)
622 load_krb5_dll();
623
624 if ( p_krb5_rc_destroy )
625 return(p_krb5_rc_destroy(con, rc));
626 else
627 return KRB5KRB_ERR_GENERIC;
628 }
629
630 size_t
631 krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
632 {
633 if (!krb5_loaded)
634 load_krb5_dll();
635
636 if ( p_krb5_checksum_size )
637 return(p_krb5_checksum_size(context, ctype));
638 else
639 return KRB5KRB_ERR_GENERIC;
640 }
641
642 krb5_boolean
643 valid_cksumtype(krb5_cksumtype ctype)
644 {
645 if (!krb5_loaded)
646 load_krb5_dll();
647
648 if ( p_valid_cksumtype )
649 return(p_valid_cksumtype(ctype));
650 else
651 return KRB5KRB_ERR_GENERIC;
652 }
653
654 krb5_error_code
655 krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
656 {
657 if (!krb5_loaded)
658 load_krb5_dll();
659
660 if ( p_krb5_kt_free_entry )
661 return(p_krb5_kt_free_entry(con,entry));
662 else
663 return KRB5KRB_ERR_GENERIC;
664 }
665
666 /* Structure definitions */
667 #ifndef NO_DEF_KRB5_CCACHE
668 #ifndef krb5_x
669 #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
670 #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
671 #endif
672
673 typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */
674
675 typedef struct _krb5_ccache
676 {
677 krb5_magic magic;
678 struct _krb5_cc_ops FAR *ops;
679 krb5_pointer data;
680 } *krb5_ccache;
681
682 typedef struct _krb5_cc_ops
683 {
684 krb5_magic magic;
685 char *prefix;
686 char * (KRB5_CALLCONV *get_name)
687 (krb5_context, krb5_ccache);
688 krb5_error_code (KRB5_CALLCONV *resolve)
689 (krb5_context, krb5_ccache *, const char *);
690 krb5_error_code (KRB5_CALLCONV *gen_new)
691 (krb5_context, krb5_ccache *);
692 krb5_error_code (KRB5_CALLCONV *init)
693 (krb5_context, krb5_ccache, krb5_principal);
694 krb5_error_code (KRB5_CALLCONV *destroy)
695 (krb5_context, krb5_ccache);
696 krb5_error_code (KRB5_CALLCONV *close)
697 (krb5_context, krb5_ccache);
698 krb5_error_code (KRB5_CALLCONV *store)
699 (krb5_context, krb5_ccache, krb5_creds *);
700 krb5_error_code (KRB5_CALLCONV *retrieve)
701 (krb5_context, krb5_ccache,
702 krb5_flags, krb5_creds *, krb5_creds *);
703 krb5_error_code (KRB5_CALLCONV *get_princ)
704 (krb5_context, krb5_ccache, krb5_principal *);
705 krb5_error_code (KRB5_CALLCONV *get_first)
706 (krb5_context, krb5_ccache, krb5_cc_cursor *);
707 krb5_error_code (KRB5_CALLCONV *get_next)
708 (krb5_context, krb5_ccache,
709 krb5_cc_cursor *, krb5_creds *);
710 krb5_error_code (KRB5_CALLCONV *end_get)
711 (krb5_context, krb5_ccache, krb5_cc_cursor *);
712 krb5_error_code (KRB5_CALLCONV *remove_cred)
713 (krb5_context, krb5_ccache,
714 krb5_flags, krb5_creds *);
715 krb5_error_code (KRB5_CALLCONV *set_flags)
716 (krb5_context, krb5_ccache, krb5_flags);
717 } krb5_cc_ops;
718 #endif /* NO_DEF_KRB5_CCACHE */
719
720 krb5_error_code
721 kssl_krb5_cc_get_principal
722 (krb5_context context, krb5_ccache cache,
723 krb5_principal *principal)
724 {
725 if ( p_krb5_cc_get_principal )
726 return(p_krb5_cc_get_principal(context,cache,principal));
727 else
728 return(krb5_x
729 ((cache)->ops->get_princ,(context, cache, principal)));
730 }
731
732 krb5_error_code
733 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
734 krb5_rcache rcache)
735 {
736 if ( p_krb5_auth_con_setrcache )
737 return(p_krb5_auth_con_setrcache(con,acon,rcache));
738 else
739 return KRB5KRB_ERR_GENERIC;
740 }
741
742 krb5_error_code
743 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
744 krb5_rcache * rcache)
745 {
746 if ( p_krb5_get_server_rcache )
747 return(p_krb5_get_server_rcache(con,data,rcache));
748 else
749 return KRB5KRB_ERR_GENERIC;
750 }
751
752 krb5_error_code
753 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
754 krb5_rcache * prcache)
755 {
756 if ( p_krb5_auth_con_getrcache )
757 return(p_krb5_auth_con_getrcache(con,acon, prcache));
758 else
759 return KRB5KRB_ERR_GENERIC;
760 }
761
762 krb5_error_code
763 kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab)
764 {
765 if ( p_krb5_kt_close )
766 return(p_krb5_kt_close(context,keytab));
767 else
768 return KRB5KRB_ERR_GENERIC;
769 }
770
771 krb5_error_code
772 kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
773 krb5_const_principal principal, krb5_kvno vno,
774 krb5_enctype enctype, krb5_keytab_entry *entry)
775 {
776 if ( p_krb5_kt_get_entry )
777 return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry));
778 else
779 return KRB5KRB_ERR_GENERIC;
780 }
781 #endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
782
783
784 /* memory allocation functions for non-temporary storage
785 * (e.g. stuff that gets saved into the kssl context) */
786 static void* kssl_calloc(size_t nmemb, size_t size)
787 {
788 void* p;
789
790 p=OPENSSL_malloc(nmemb*size);
791 if (p){
792 memset(p, 0, nmemb*size);
793 }
794 return p;
795 }
796
797 #define kssl_malloc(size) OPENSSL_malloc((size))
798 #define kssl_realloc(ptr, size) OPENSSL_realloc(ptr, size)
799 #define kssl_free(ptr) OPENSSL_free((ptr))
800
801
802 char
803 *kstring(char *string)
804 {
805 static char *null = "[NULL]";
806
807 return ((string == NULL)? null: string);
808 }
809
810 /* Given KRB5 enctype (basically DES or 3DES),
811 ** return closest match openssl EVP_ encryption algorithm.
812 ** Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes.
813 ** Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK.
814 */
815 const EVP_CIPHER *
816 kssl_map_enc(krb5_enctype enctype)
817 {
818 switch (enctype)
819 {
820 case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */
821 case ENCTYPE_DES_CBC_CRC:
822 case ENCTYPE_DES_CBC_MD4:
823 case ENCTYPE_DES_CBC_MD5:
824 case ENCTYPE_DES_CBC_RAW:
825 return EVP_des_cbc();
826 break;
827 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */
828 case ENCTYPE_DES3_CBC_SHA:
829 case ENCTYPE_DES3_CBC_RAW:
830 return EVP_des_ede3_cbc();
831 break;
832 default: return NULL;
833 break;
834 }
835 }
836
837
838 /* Return true:1 if p "looks like" the start of the real authenticator
839 ** described in kssl_skip_confound() below. The ASN.1 pattern is
840 ** "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
841 ** xx and yy are possibly multi-byte length fields.
842 */
843 static int kssl_test_confound(unsigned char *p)
844 {
845 int len = 2;
846 int xx = 0, yy = 0;
847
848 if (*p++ != 0x62) return 0;
849 if (*p > 0x82) return 0;
850 switch(*p) {
851 case 0x82: p++; xx = (*p++ << 8); xx += *p++; break;
852 case 0x81: p++; xx = *p++; break;
853 case 0x80: return 0;
854 default: xx = *p++; break;
855 }
856 if (*p++ != 0x30) return 0;
857 if (*p > 0x82) return 0;
858 switch(*p) {
859 case 0x82: p++; len+=2; yy = (*p++ << 8); yy += *p++; break;
860 case 0x81: p++; len++; yy = *p++; break;
861 case 0x80: return 0;
862 default: yy = *p++; break;
863 }
864
865 return (xx - len == yy)? 1: 0;
866 }
867
868 /* Allocate, fill, and return cksumlens array of checksum lengths.
869 ** This array holds just the unique elements from the krb5_cksumarray[].
870 ** array[n] == 0 signals end of data.
871 **
872 ** The krb5_cksumarray[] was an internal variable that has since been
873 ** replaced by a more general method for storing the data. It should
874 ** not be used. Instead we use real API calls and make a guess for
875 ** what the highest assigned CKSUMTYPE_ constant is. As of 1.2.2
876 ** it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3). So we will use 0x0010.
877 */
878 static size_t *populate_cksumlens(void)
879 {
880 int i, j, n;
881 static size_t *cklens = NULL;
882
883 #ifdef KRB5_MIT_OLD11
884 n = krb5_max_cksum;
885 #else
886 n = 0x0010;
887 #endif /* KRB5_MIT_OLD11 */
888
889 #ifdef KRB5CHECKAUTH
890 if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1))) return NULL;
891
892 for (i=0; i < n; i++) {
893 if (!valid_cksumtype(i)) continue; /* array has holes */
894 for (j=0; j < n; j++) {
895 if (cklens[j] == 0) {
896 cklens[j] = krb5_checksum_size(NULL,i);
897 break; /* krb5 elem was new: add */
898 }
899 if (cklens[j] == krb5_checksum_size(NULL,i)) {
900 break; /* ignore duplicate elements */
901 }
902 }
903 }
904 #endif /* KRB5CHECKAUTH */
905
906 return cklens;
907 }
908
909 /* Return pointer to start of real authenticator within authenticator, or
910 ** return NULL on error.
911 ** Decrypted authenticator looks like this:
912 ** [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
913 ** This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
914 ** krb5_auth_con_getcksumtype() function advertised in its krb5.h.
915 */
916 unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
917 {
918 int i, conlen;
919 size_t cklen;
920 static size_t *cksumlens = NULL;
921 unsigned char *test_auth;
922
923 conlen = (etype)? 8: 0;
924
925 if (!cksumlens && !(cksumlens = populate_cksumlens())) return NULL;
926 for (i=0; (cklen = cksumlens[i]) != 0; i++)
927 {
928 test_auth = a + conlen + cklen;
929 if (kssl_test_confound(test_auth)) return test_auth;
930 }
931
932 return NULL;
933 }
934
935
936 /* Set kssl_err error info when reason text is a simple string
937 ** kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
938 */
939 void
940 kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
941 {
942 if (kssl_err == NULL) return;
943
944 kssl_err->reason = reason;
945 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "%s", text);
946 return;
947 }
948
949
950 /* Display contents of krb5_data struct, for debugging
951 */
952 void
953 print_krb5_data(char *label, krb5_data *kdata)
954 {
955 int i;
956
957 printf("%s[%d] ", label, kdata->length);
958 for (i=0; i < (int)kdata->length; i++)
959 {
960 if (0 && isprint((int) kdata->data[i]))
961 printf( "%c ", kdata->data[i]);
962 else
963 printf( "%02x ", (unsigned char) kdata->data[i]);
964 }
965 printf("\n");
966 }
967
968
969 /* Display contents of krb5_authdata struct, for debugging
970 */
971 void
972 print_krb5_authdata(char *label, krb5_authdata **adata)
973 {
974 if (adata == NULL)
975 {
976 printf("%s, authdata==0\n", label);
977 return;
978 }
979 printf("%s [%p]\n", label, (void *)adata);
980 #if 0
981 {
982 int i;
983 printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
984 for (i=0; i < adata->length; i++)
985 {
986 printf((isprint(adata->contents[i]))? "%c ": "%02x",
987 adata->contents[i]);
988 }
989 printf("\n");
990 }
991 #endif
992 }
993
994
995 /* Display contents of krb5_keyblock struct, for debugging
996 */
997 void
998 print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
999 {
1000 int i;
1001
1002 if (keyblk == NULL)
1003 {
1004 printf("%s, keyblk==0\n", label);
1005 return;
1006 }
1007 #ifdef KRB5_HEIMDAL
1008 printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
1009 keyblk->keyvalue->length);
1010 for (i=0; i < (int)keyblk->keyvalue->length; i++)
1011 {
1012 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
1013 }
1014 printf("\n");
1015 #else
1016 printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
1017 for (i=0; i < (int)keyblk->length; i++)
1018 {
1019 printf("%02x",keyblk->contents[i]);
1020 }
1021 printf("\n");
1022 #endif
1023 }
1024
1025
1026 /* Display contents of krb5_principal_data struct, for debugging
1027 ** (krb5_principal is typedef'd == krb5_principal_data *)
1028 */
1029 static void
1030 print_krb5_princ(char *label, krb5_principal_data *princ)
1031 {
1032 int i, ui, uj;
1033
1034 printf("%s principal Realm: ", label);
1035 if (princ == NULL) return;
1036 for (ui=0; ui < (int)princ->realm.length; ui++) putchar(princ->realm.data[ui]);
1037 printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
1038 for (i=0; i < (int)princ->length; i++)
1039 {
1040 printf("\t%d [%d]: ", i, princ->data[i].length);
1041 for (uj=0; uj < (int)princ->data[i].length; uj++) {
1042 putchar(princ->data[i].data[uj]);
1043 }
1044 printf("\n");
1045 }
1046 return;
1047 }
1048
1049
1050 /* Given krb5 service (typically "kssl") and hostname in kssl_ctx,
1051 ** Return encrypted Kerberos ticket for service @ hostname.
1052 ** If authenp is non-NULL, also return encrypted authenticator,
1053 ** whose data should be freed by caller.
1054 ** (Originally was: Create Kerberos AP_REQ message for SSL Client.)
1055 **
1056 ** 19990628 VRS Started; Returns Kerberos AP_REQ message.
1057 ** 20010409 VRS Modified for RFC2712; Returns enc tkt.
1058 ** 20010606 VRS May also return optional authenticator.
1059 */
1060 krb5_error_code
1061 kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
1062 /* OUT */ krb5_data **enc_ticketp,
1063 /* UPDATE */ krb5_data *authenp,
1064 /* OUT */ KSSL_ERR *kssl_err)
1065 {
1066 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1067 krb5_context krb5context = NULL;
1068 krb5_auth_context krb5auth_context = NULL;
1069 krb5_ccache krb5ccdef = NULL;
1070 krb5_creds krb5creds, *krb5credsp = NULL;
1071 krb5_data krb5_app_req;
1072
1073 kssl_err_set(kssl_err, 0, "");
1074 memset((char *)&krb5creds, 0, sizeof(krb5creds));
1075
1076 if (!kssl_ctx)
1077 {
1078 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1079 "No kssl_ctx defined.\n");
1080 goto err;
1081 }
1082 else if (!kssl_ctx->service_host)
1083 {
1084 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1085 "kssl_ctx service_host undefined.\n");
1086 goto err;
1087 }
1088
1089 if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1090 {
1091 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1092 "krb5_init_context() fails: %d\n", krb5rc);
1093 kssl_err->reason = SSL_R_KRB5_C_INIT;
1094 goto err;
1095 }
1096
1097 if ((krb5rc = krb5_sname_to_principal(krb5context,
1098 kssl_ctx->service_host,
1099 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1100 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1101 {
1102 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1103 "krb5_sname_to_principal() fails for %s/%s\n",
1104 kssl_ctx->service_host,
1105 (kssl_ctx->service_name)? kssl_ctx->service_name:
1106 KRB5SVC);
1107 kssl_err->reason = SSL_R_KRB5_C_INIT;
1108 goto err;
1109 }
1110
1111 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1112 {
1113 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1114 "krb5_cc_default fails.\n");
1115 goto err;
1116 }
1117
1118 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1119 &krb5creds.client)) != 0)
1120 {
1121 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1122 "krb5_cc_get_principal() fails.\n");
1123 goto err;
1124 }
1125
1126 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1127 &krb5creds, &krb5credsp)) != 0)
1128 {
1129 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1130 "krb5_get_credentials() fails.\n");
1131 goto err;
1132 }
1133
1134 *enc_ticketp = &krb5credsp->ticket;
1135 #ifdef KRB5_HEIMDAL
1136 kssl_ctx->enctype = krb5credsp->session.keytype;
1137 #else
1138 kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1139 #endif
1140
1141 krb5rc = KRB5KRB_ERR_GENERIC;
1142 /* caller should free data of krb5_app_req */
1143 /* 20010406 VRS deleted for real KerberosWrapper
1144 ** 20010605 VRS reinstated to offer Authenticator to KerberosWrapper
1145 */
1146 krb5_app_req.length = 0;
1147 if (authenp)
1148 {
1149 krb5_data krb5in_data;
1150 const unsigned char *p;
1151 long arlen;
1152 KRB5_APREQBODY *ap_req;
1153
1154 authenp->length = 0;
1155 krb5in_data.data = NULL;
1156 krb5in_data.length = 0;
1157 if ((krb5rc = krb5_mk_req_extended(krb5context,
1158 &krb5auth_context, 0, &krb5in_data, krb5credsp,
1159 &krb5_app_req)) != 0)
1160 {
1161 kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1162 "krb5_mk_req_extended() fails.\n");
1163 goto err;
1164 }
1165
1166 arlen = krb5_app_req.length;
1167 p = (unsigned char *)krb5_app_req.data;
1168 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
1169 if (ap_req)
1170 {
1171 authenp->length = i2d_KRB5_ENCDATA(
1172 ap_req->authenticator, NULL);
1173 if (authenp->length &&
1174 (authenp->data = malloc(authenp->length)))
1175 {
1176 unsigned char *adp = (unsigned char *)authenp->data;
1177 authenp->length = i2d_KRB5_ENCDATA(
1178 ap_req->authenticator, &adp);
1179 }
1180 }
1181
1182 if (ap_req) KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1183 if (krb5_app_req.length)
1184 kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1185 }
1186 #ifdef KRB5_HEIMDAL
1187 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1188 {
1189 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1190 "kssl_ctx_setkey() fails.\n");
1191 }
1192 #else
1193 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1194 {
1195 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1196 "kssl_ctx_setkey() fails.\n");
1197 }
1198 #endif
1199 else krb5rc = 0;
1200
1201 err:
1202 #ifdef KSSL_DEBUG
1203 kssl_ctx_show(kssl_ctx);
1204 #endif /* KSSL_DEBUG */
1205
1206 if (krb5creds.client) krb5_free_principal(krb5context,
1207 krb5creds.client);
1208 if (krb5creds.server) krb5_free_principal(krb5context,
1209 krb5creds.server);
1210 if (krb5auth_context) krb5_auth_con_free(krb5context,
1211 krb5auth_context);
1212 if (krb5context) krb5_free_context(krb5context);
1213 return (krb5rc);
1214 }
1215
1216
1217 /* Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1218 ** Return Kerberos error code and kssl_err struct on error.
1219 ** Allocates krb5_ticket and krb5_principal; caller should free these.
1220 **
1221 ** 20010410 VRS Implemented krb5_decode_ticket() as
1222 ** old_krb5_decode_ticket(). Missing from MIT1.0.6.
1223 ** 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions.
1224 ** Re-used some of the old krb5_decode_ticket()
1225 ** code here. This tkt should alloc/free just
1226 ** like the real thing.
1227 */
1228 static krb5_error_code
1229 kssl_TKT2tkt( /* IN */ krb5_context krb5context,
1230 /* IN */ KRB5_TKTBODY *asn1ticket,
1231 /* OUT */ krb5_ticket **krb5ticket,
1232 /* OUT */ KSSL_ERR *kssl_err )
1233 {
1234 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1235 krb5_ticket *new5ticket = NULL;
1236 ASN1_GENERALSTRING *gstr_svc, *gstr_host;
1237
1238 *krb5ticket = NULL;
1239
1240 if (asn1ticket == NULL || asn1ticket->realm == NULL ||
1241 asn1ticket->sname == NULL ||
1242 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2)
1243 {
1244 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1245 "Null field in asn1ticket.\n");
1246 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1247 return KRB5KRB_ERR_GENERIC;
1248 }
1249
1250 if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
1251 {
1252 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1253 "Unable to allocate new krb5_ticket.\n");
1254 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1255 return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */
1256 }
1257
1258 gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0);
1259 gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1);
1260
1261 if ((krb5rc = kssl_build_principal_2(krb5context,
1262 &new5ticket->server,
1263 asn1ticket->realm->length, (char *)asn1ticket->realm->data,
1264 gstr_svc->length, (char *)gstr_svc->data,
1265 gstr_host->length, (char *)gstr_host->data)) != 0)
1266 {
1267 free(new5ticket);
1268 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1269 "Error building ticket server principal.\n");
1270 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1271 return krb5rc; /* or KRB5KRB_ERR_GENERIC; */
1272 }
1273
1274 krb5_princ_type(krb5context, new5ticket->server) =
1275 asn1ticket->sname->nametype->data[0];
1276 new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1277 new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1278 new5ticket->enc_part.ciphertext.length =
1279 asn1ticket->encdata->cipher->length;
1280 if ((new5ticket->enc_part.ciphertext.data =
1281 calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
1282 {
1283 free(new5ticket);
1284 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1285 "Error allocating cipher in krb5ticket.\n");
1286 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1287 return KRB5KRB_ERR_GENERIC;
1288 }
1289 else
1290 {
1291 memcpy(new5ticket->enc_part.ciphertext.data,
1292 asn1ticket->encdata->cipher->data,
1293 asn1ticket->encdata->cipher->length);
1294 }
1295
1296 *krb5ticket = new5ticket;
1297 return 0;
1298 }
1299
1300
1301 /* Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1302 ** and krb5 AP_REQ message & message length,
1303 ** Return Kerberos session key and client principle
1304 ** to SSL Server in KSSL_CTX *kssl_ctx.
1305 **
1306 ** 19990702 VRS Started.
1307 */
1308 krb5_error_code
1309 kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
1310 /* IN */ krb5_data *indata,
1311 /* OUT */ krb5_ticket_times *ttimes,
1312 /* OUT */ KSSL_ERR *kssl_err )
1313 {
1314 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1315 static krb5_context krb5context = NULL;
1316 static krb5_auth_context krb5auth_context = NULL;
1317 krb5_ticket *krb5ticket = NULL;
1318 KRB5_TKTBODY *asn1ticket = NULL;
1319 const unsigned char *p;
1320 krb5_keytab krb5keytab = NULL;
1321 krb5_keytab_entry kt_entry;
1322 krb5_principal krb5server;
1323 krb5_rcache rcache = NULL;
1324
1325 kssl_err_set(kssl_err, 0, "");
1326
1327 if (!kssl_ctx)
1328 {
1329 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1330 "No kssl_ctx defined.\n");
1331 goto err;
1332 }
1333
1334 #ifdef KSSL_DEBUG
1335 printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
1336 #endif /* KSSL_DEBUG */
1337
1338 if (!krb5context && (krb5rc = krb5_init_context(&krb5context)))
1339 {
1340 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1341 "krb5_init_context() fails.\n");
1342 goto err;
1343 }
1344 if (krb5auth_context &&
1345 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
1346 {
1347 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1348 "krb5_auth_con_free() fails.\n");
1349 goto err;
1350 }
1351 else krb5auth_context = NULL;
1352 if (!krb5auth_context &&
1353 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
1354 {
1355 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1356 "krb5_auth_con_init() fails.\n");
1357 goto err;
1358 }
1359
1360
1361 if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1362 &rcache)))
1363 {
1364 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1365 "krb5_auth_con_getrcache() fails.\n");
1366 goto err;
1367 }
1368
1369 if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1370 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1371 KRB5_NT_SRV_HST, &krb5server)) != 0)
1372 {
1373 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1374 "krb5_sname_to_principal() fails.\n");
1375 goto err;
1376 }
1377
1378 if (rcache == NULL)
1379 {
1380 if ((krb5rc = krb5_get_server_rcache(krb5context,
1381 krb5_princ_component(krb5context, krb5server, 0),
1382 &rcache)))
1383 {
1384 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1385 "krb5_get_server_rcache() fails.\n");
1386 goto err;
1387 }
1388 }
1389
1390 if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
1391 {
1392 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1393 "krb5_auth_con_setrcache() fails.\n");
1394 goto err;
1395 }
1396
1397
1398 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default
1399 */
1400 if (kssl_ctx->keytab_file)
1401 {
1402 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1403 &krb5keytab);
1404 if (krb5rc)
1405 {
1406 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1407 "krb5_kt_resolve() fails.\n");
1408 goto err;
1409 }
1410 }
1411 else
1412 {
1413 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1414 if (krb5rc)
1415 {
1416 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1417 "krb5_kt_default() fails.\n");
1418 goto err;
1419 }
1420 }
1421
1422 /* Actual Kerberos5 krb5_recvauth() has initial conversation here
1423 ** o check KRB5_SENDAUTH_BADAUTHVERS
1424 ** unless KRB5_RECVAUTH_SKIP_VERSION
1425 ** o check KRB5_SENDAUTH_BADAPPLVERS
1426 ** o send "0" msg if all OK
1427 */
1428
1429 /* 20010411 was using AP_REQ instead of true KerberosWrapper
1430 **
1431 ** if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1432 ** &krb5in_data, krb5server, krb5keytab,
1433 ** &ap_option, &krb5ticket)) != 0) { Error }
1434 */
1435
1436 p = (unsigned char *)indata->data;
1437 if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
1438 (long) indata->length)) == NULL)
1439 {
1440 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1441 "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1442 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1443 goto err;
1444 }
1445
1446 /* Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
1447 if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1448 kssl_err)) != 0)
1449 {
1450 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1451 "Error converting ASN.1 ticket to krb5_ticket.\n");
1452 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1453 goto err;
1454 }
1455
1456 if (! krb5_principal_compare(krb5context, krb5server,
1457 krb5ticket->server)) {
1458 krb5rc = KRB5_PRINC_NOMATCH;
1459 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1460 "server principal != ticket principal\n");
1461 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1462 goto err;
1463 }
1464 if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1465 krb5ticket->server, krb5ticket->enc_part.kvno,
1466 krb5ticket->enc_part.enctype, &kt_entry)) != 0) {
1467 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1468 "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1469 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1470 goto err;
1471 }
1472 if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1473 krb5ticket)) != 0) {
1474 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1475 "krb5_decrypt_tkt_part() failed.\n");
1476 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1477 goto err;
1478 }
1479 else {
1480 krb5_kt_free_entry(krb5context, &kt_entry);
1481 #ifdef KSSL_DEBUG
1482 {
1483 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1484 printf("Decrypted ticket fields:\n");
1485 printf("\tflags: %X, transit-type: %X",
1486 krb5ticket->enc_part2->flags,
1487 krb5ticket->enc_part2->transited.tr_type);
1488 print_krb5_data("\ttransit-data: ",
1489 &(krb5ticket->enc_part2->transited.tr_contents));
1490 printf("\tcaddrs: %p, authdata: %p\n",
1491 krb5ticket->enc_part2->caddrs,
1492 krb5ticket->enc_part2->authorization_data);
1493 if (paddr)
1494 {
1495 printf("\tcaddrs:\n");
1496 for (i=0; paddr[i] != NULL; i++)
1497 {
1498 krb5_data d;
1499 d.length=paddr[i]->length;
1500 d.data=paddr[i]->contents;
1501 print_krb5_data("\t\tIP: ", &d);
1502 }
1503 }
1504 printf("\tstart/auth/end times: %d / %d / %d\n",
1505 krb5ticket->enc_part2->times.starttime,
1506 krb5ticket->enc_part2->times.authtime,
1507 krb5ticket->enc_part2->times.endtime);
1508 }
1509 #endif /* KSSL_DEBUG */
1510 }
1511
1512 krb5rc = KRB5_NO_TKT_SUPPLIED;
1513 if (!krb5ticket || !krb5ticket->enc_part2 ||
1514 !krb5ticket->enc_part2->client ||
1515 !krb5ticket->enc_part2->client->data ||
1516 !krb5ticket->enc_part2->session)
1517 {
1518 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1519 "bad ticket from krb5_rd_req.\n");
1520 }
1521 else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1522 &krb5ticket->enc_part2->client->realm,
1523 krb5ticket->enc_part2->client->data,
1524 krb5ticket->enc_part2->client->length))
1525 {
1526 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1527 "kssl_ctx_setprinc() fails.\n");
1528 }
1529 else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
1530 {
1531 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1532 "kssl_ctx_setkey() fails.\n");
1533 }
1534 else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
1535 {
1536 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1537 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1538 "invalid ticket from krb5_rd_req.\n");
1539 }
1540 else krb5rc = 0;
1541
1542 kssl_ctx->enctype = krb5ticket->enc_part.enctype;
1543 ttimes->authtime = krb5ticket->enc_part2->times.authtime;
1544 ttimes->starttime = krb5ticket->enc_part2->times.starttime;
1545 ttimes->endtime = krb5ticket->enc_part2->times.endtime;
1546 ttimes->renew_till = krb5ticket->enc_part2->times.renew_till;
1547
1548 err:
1549 #ifdef KSSL_DEBUG
1550 kssl_ctx_show(kssl_ctx);
1551 #endif /* KSSL_DEBUG */
1552
1553 if (asn1ticket) KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1554 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab);
1555 if (krb5ticket) krb5_free_ticket(krb5context, krb5ticket);
1556 if (krb5server) krb5_free_principal(krb5context, krb5server);
1557 return (krb5rc);
1558 }
1559
1560
1561 /* Allocate & return a new kssl_ctx struct.
1562 */
1563 KSSL_CTX *
1564 kssl_ctx_new(void)
1565 {
1566 return ((KSSL_CTX *) kssl_calloc(1, sizeof(KSSL_CTX)));
1567 }
1568
1569
1570 /* Frees a kssl_ctx struct and any allocated memory it holds.
1571 ** Returns NULL.
1572 */
1573 KSSL_CTX *
1574 kssl_ctx_free(KSSL_CTX *kssl_ctx)
1575 {
1576 if (kssl_ctx == NULL) return kssl_ctx;
1577
1578 if (kssl_ctx->key) OPENSSL_cleanse(kssl_ctx->key,
1579 kssl_ctx->length);
1580 if (kssl_ctx->key) kssl_free(kssl_ctx->key);
1581 if (kssl_ctx->client_princ) kssl_free(kssl_ctx->client_princ);
1582 if (kssl_ctx->service_host) kssl_free(kssl_ctx->service_host);
1583 if (kssl_ctx->service_name) kssl_free(kssl_ctx->service_name);
1584 if (kssl_ctx->keytab_file) kssl_free(kssl_ctx->keytab_file);
1585
1586 kssl_free(kssl_ctx);
1587 return (KSSL_CTX *) NULL;
1588 }
1589
1590
1591 /* Given an array of (krb5_data *) entity (and optional realm),
1592 ** set the plain (char *) client_princ or service_host member
1593 ** of the kssl_ctx struct.
1594 */
1595 krb5_error_code
1596 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1597 krb5_data *realm, krb5_data *entity, int nentities)
1598 {
1599 char **princ;
1600 int length;
1601 int i;
1602
1603 if (kssl_ctx == NULL || entity == NULL) return KSSL_CTX_ERR;
1604
1605 switch (which)
1606 {
1607 case KSSL_CLIENT: princ = &kssl_ctx->client_princ; break;
1608 case KSSL_SERVER: princ = &kssl_ctx->service_host; break;
1609 default: return KSSL_CTX_ERR; break;
1610 }
1611 if (*princ) kssl_free(*princ);
1612
1613 /* Add up all the entity->lengths */
1614 length = 0;
1615 for (i=0; i < nentities; i++)
1616 {
1617 length += entity[i].length;
1618 }
1619 /* Add in space for the '/' character(s) (if any) */
1620 length += nentities-1;
1621 /* Space for the ('@'+realm+NULL | NULL) */
1622 length += ((realm)? realm->length + 2: 1);
1623
1624 if ((*princ = kssl_calloc(1, length)) == NULL)
1625 return KSSL_CTX_ERR;
1626 else
1627 {
1628 for (i = 0; i < nentities; i++)
1629 {
1630 strncat(*princ, entity[i].data, entity[i].length);
1631 if (i < nentities-1)
1632 {
1633 strcat (*princ, "/");
1634 }
1635 }
1636 if (realm)
1637 {
1638 strcat (*princ, "@");
1639 (void) strncat(*princ, realm->data, realm->length);
1640 }
1641 }
1642
1643 return KSSL_CTX_OK;
1644 }
1645
1646
1647 /* Set one of the plain (char *) string members of the kssl_ctx struct.
1648 ** Default values should be:
1649 ** which == KSSL_SERVICE => "khost" (KRB5SVC)
1650 ** which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB)
1651 */
1652 krb5_error_code
1653 kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1654 {
1655 char **string;
1656
1657 if (!kssl_ctx) return KSSL_CTX_ERR;
1658
1659 switch (which)
1660 {
1661 case KSSL_SERVICE: string = &kssl_ctx->service_name; break;
1662 case KSSL_SERVER: string = &kssl_ctx->service_host; break;
1663 case KSSL_CLIENT: string = &kssl_ctx->client_princ; break;
1664 case KSSL_KEYTAB: string = &kssl_ctx->keytab_file; break;
1665 default: return KSSL_CTX_ERR; break;
1666 }
1667 if (*string) kssl_free(*string);
1668
1669 if (!text)
1670 {
1671 *string = '\0';
1672 return KSSL_CTX_OK;
1673 }
1674
1675 if ((*string = kssl_calloc(1, strlen(text) + 1)) == NULL)
1676 return KSSL_CTX_ERR;
1677 else
1678 strcpy(*string, text);
1679
1680 return KSSL_CTX_OK;
1681 }
1682
1683
1684 /* Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1685 ** struct. Clear kssl_ctx->key if Kerberos session key is NULL.
1686 */
1687 krb5_error_code
1688 kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1689 {
1690 int length;
1691 krb5_enctype enctype;
1692 krb5_octet FAR *contents = NULL;
1693
1694 if (!kssl_ctx) return KSSL_CTX_ERR;
1695
1696 if (kssl_ctx->key)
1697 {
1698 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
1699 kssl_free(kssl_ctx->key);
1700 }
1701
1702 if (session)
1703 {
1704
1705 #ifdef KRB5_HEIMDAL
1706 length = session->keyvalue->length;
1707 enctype = session->keytype;
1708 contents = session->keyvalue->contents;
1709 #else
1710 length = session->length;
1711 enctype = session->enctype;
1712 contents = session->contents;
1713 #endif
1714 kssl_ctx->enctype = enctype;
1715 kssl_ctx->length = length;
1716 }
1717 else
1718 {
1719 kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1720 kssl_ctx->length = 0;
1721 return KSSL_CTX_OK;
1722 }
1723
1724 if ((kssl_ctx->key =
1725 (krb5_octet FAR *) kssl_calloc(1, kssl_ctx->length)) == NULL)
1726 {
1727 kssl_ctx->length = 0;
1728 return KSSL_CTX_ERR;
1729 }
1730 else
1731 memcpy(kssl_ctx->key, contents, length);
1732
1733 return KSSL_CTX_OK;
1734 }
1735
1736
1737 /* Display contents of kssl_ctx struct
1738 */
1739 void
1740 kssl_ctx_show(KSSL_CTX *kssl_ctx)
1741 {
1742 int i;
1743
1744 printf("kssl_ctx: ");
1745 if (kssl_ctx == NULL)
1746 {
1747 printf("NULL\n");
1748 return;
1749 }
1750 else
1751 printf("%p\n", (void *)kssl_ctx);
1752
1753 printf("\tservice:\t%s\n",
1754 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
1755 printf("\tclient:\t%s\n",
1756 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
1757 printf("\tserver:\t%s\n",
1758 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
1759 printf("\tkeytab:\t%s\n",
1760 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
1761 printf("\tkey [%d:%d]:\t",
1762 kssl_ctx->enctype, kssl_ctx->length);
1763
1764 for (i=0; i < kssl_ctx->length && kssl_ctx->key; i++)
1765 {
1766 printf("%02x", kssl_ctx->key[i]);
1767 }
1768 printf("\n");
1769 return;
1770 }
1771
1772 int
1773 kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1774 {
1775 krb5_context krb5context = NULL;
1776 krb5_keytab krb5keytab = NULL;
1777 krb5_keytab_entry entry;
1778 krb5_principal princ = NULL;
1779 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1780 int rc = 0;
1781
1782 if ((krb5rc = krb5_init_context(&krb5context)))
1783 return(0);
1784
1785 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default
1786 */
1787 if (kssl_ctx->keytab_file)
1788 {
1789 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1790 &krb5keytab);
1791 if (krb5rc)
1792 goto exit;
1793 }
1794 else
1795 {
1796 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1797 if (krb5rc)
1798 goto exit;
1799 }
1800
1801 /* the host key we are looking for */
1802 krb5rc = krb5_sname_to_principal(krb5context, NULL,
1803 kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
1804 KRB5_NT_SRV_HST, &princ);
1805
1806 if (krb5rc)
1807 goto exit;
1808
1809 krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1810 princ,
1811 0 /* IGNORE_VNO */,
1812 0 /* IGNORE_ENCTYPE */,
1813 &entry);
1814 if ( krb5rc == KRB5_KT_NOTFOUND ) {
1815 rc = 1;
1816 goto exit;
1817 } else if ( krb5rc )
1818 goto exit;
1819
1820 krb5_kt_free_entry(krb5context, &entry);
1821 rc = 1;
1822
1823 exit:
1824 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab);
1825 if (princ) krb5_free_principal(krb5context, princ);
1826 if (krb5context) krb5_free_context(krb5context);
1827 return(rc);
1828 }
1829
1830 int
1831 kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1832 {
1833 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1834 krb5_context krb5context = NULL;
1835 krb5_ccache krb5ccdef = NULL;
1836 krb5_creds krb5creds, *krb5credsp = NULL;
1837 int rc = 0;
1838
1839 memset((char *)&krb5creds, 0, sizeof(krb5creds));
1840
1841 if (!kssl_ctx)
1842 return(0);
1843
1844 if (!kssl_ctx->service_host)
1845 return(0);
1846
1847 if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1848 goto err;
1849
1850 if ((krb5rc = krb5_sname_to_principal(krb5context,
1851 kssl_ctx->service_host,
1852 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1853 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1854 goto err;
1855
1856 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1857 goto err;
1858
1859 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1860 &krb5creds.client)) != 0)
1861 goto err;
1862
1863 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1864 &krb5creds, &krb5credsp)) != 0)
1865 goto err;
1866
1867 rc = 1;
1868
1869 err:
1870 #ifdef KSSL_DEBUG
1871 kssl_ctx_show(kssl_ctx);
1872 #endif /* KSSL_DEBUG */
1873
1874 if (krb5creds.client) krb5_free_principal(krb5context, krb5creds.client);
1875 if (krb5creds.server) krb5_free_principal(krb5context, krb5creds.server);
1876 if (krb5context) krb5_free_context(krb5context);
1877 return(rc);
1878 }
1879
1880 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1881 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1882 {
1883 #ifdef KRB5_HEIMDAL
1884 data->length = 0;
1885 if (data->data)
1886 free(data->data);
1887 #elif defined(KRB5_MIT_OLD11)
1888 if (data->data) {
1889 krb5_xfree(data->data);
1890 data->data = 0;
1891 }
1892 #else
1893 krb5_free_data_contents(NULL, data);
1894 #endif
1895 }
1896 #endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1897
1898
1899 /* Given pointers to KerberosTime and struct tm structs, convert the
1900 ** KerberosTime string to struct tm. Note that KerberosTime is a
1901 ** ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional
1902 ** seconds as defined in RFC 1510.
1903 ** Return pointer to the (partially) filled in struct tm on success,
1904 ** return NULL on failure.
1905 */
1906 static struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
1907 {
1908 char c, *p;
1909
1910 if (!k_tm) return NULL;
1911 if (gtime == NULL || gtime->length < 14) return NULL;
1912 if (gtime->data == NULL) return NULL;
1913
1914 p = (char *)>ime->data[14];
1915
1916 c = *p; *p = '\0'; p -= 2; k_tm->tm_sec = atoi(p); *(p+2) = c;
1917 c = *p; *p = '\0'; p -= 2; k_tm->tm_min = atoi(p); *(p+2) = c;
1918 c = *p; *p = '\0'; p -= 2; k_tm->tm_hour = atoi(p); *(p+2) = c;
1919 c = *p; *p = '\0'; p -= 2; k_tm->tm_mday = atoi(p); *(p+2) = c;
1920 c = *p; *p = '\0'; p -= 2; k_tm->tm_mon = atoi(p)-1; *(p+2) = c;
1921 c = *p; *p = '\0'; p -= 4; k_tm->tm_year = atoi(p)-1900; *(p+4) = c;
1922
1923 return k_tm;
1924 }
1925
1926
1927 /* Helper function for kssl_validate_times().
1928 ** We need context->clockskew, but krb5_context is an opaque struct.
1929 ** So we try to sneek the clockskew out through the replay cache.
1930 ** If that fails just return a likely default (300 seconds).
1931 */
1932 static krb5_deltat get_rc_clockskew(krb5_context context)
1933 {
1934 krb5_rcache rc;
1935 krb5_deltat clockskew;
1936
1937 if (krb5_rc_default(context, &rc)) return KSSL_CLOCKSKEW;
1938 if (krb5_rc_initialize(context, rc, 0)) return KSSL_CLOCKSKEW;
1939 if (krb5_rc_get_lifespan(context, rc, &clockskew)) {
1940 clockskew = KSSL_CLOCKSKEW;
1941 }
1942 (void) krb5_rc_destroy(context, rc);
1943 return clockskew;
1944 }
1945
1946
1947 /* kssl_validate_times() combines (and more importantly exposes)
1948 ** the MIT KRB5 internal function krb5_validate_times() and the
1949 ** in_clock_skew() macro. The authenticator client time is checked
1950 ** to be within clockskew secs of the current time and the current
1951 ** time is checked to be within the ticket start and expire times.
1952 ** Either check may be omitted by supplying a NULL value.
1953 ** Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
1954 ** See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
1955 ** 20010420 VRS
1956 */
1957 krb5_error_code kssl_validate_times( krb5_timestamp atime,
1958 krb5_ticket_times *ttimes)
1959 {
1960 krb5_deltat skew;
1961 krb5_timestamp start, now;
1962 krb5_error_code rc;
1963 krb5_context context;
1964
1965 if ((rc = krb5_init_context(&context))) return SSL_R_KRB5_S_BAD_TICKET;
1966 skew = get_rc_clockskew(context);
1967 if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
1968 krb5_free_context(context);
1969
1970 if (atime && labs(atime - now) >= skew) return SSL_R_KRB5_S_TKT_SKEW;
1971
1972 if (! ttimes) return 0;
1973
1974 start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
1975 if (start - now > skew) return SSL_R_KRB5_S_TKT_NYV;
1976 if ((now - ttimes->endtime) > skew) return SSL_R_KRB5_S_TKT_EXPIRED;
1977
1978 #ifdef KSSL_DEBUG
1979 printf("kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n",
1980 start, atime, now, skew, ttimes->endtime);
1981 #endif /* KSSL_DEBUG */
1982
1983 return 0;
1984 }
1985
1986
1987 /* Decode and decrypt given DER-encoded authenticator, then pass
1988 ** authenticator ctime back in *atimep (or 0 if time unavailable).
1989 ** Returns krb5_error_code and kssl_err on error. A NULL
1990 ** authenticator (authentp->length == 0) is not considered an error.
1991 ** Note that kssl_check_authent() makes use of the KRB5 session key;
1992 ** you must call kssl_sget_tkt() to get the key before calling this routine.
1993 */
1994 krb5_error_code kssl_check_authent(
1995 /* IN */ KSSL_CTX *kssl_ctx,
1996 /* IN */ krb5_data *authentp,
1997 /* OUT */ krb5_timestamp *atimep,
1998 /* OUT */ KSSL_ERR *kssl_err )
1999 {
2000 krb5_error_code krb5rc = 0;
2001 KRB5_ENCDATA *dec_authent = NULL;
2002 KRB5_AUTHENTBODY *auth = NULL;
2003 krb5_enctype enctype;
2004 EVP_CIPHER_CTX ciph_ctx;
2005 const EVP_CIPHER *enc = NULL;
2006 unsigned char iv[EVP_MAX_IV_LENGTH];
2007 const unsigned char *p;
2008 unsigned char *unenc_authent;
2009 int outl, unencbufsize;
2010 struct tm tm_time, *tm_l, *tm_g;
2011 time_t now, tl, tg, tr, tz_offset;
2012
2013 EVP_CIPHER_CTX_init(&ciph_ctx);
2014 *atimep = 0;
2015 kssl_err_set(kssl_err, 0, "");
2016
2017 #ifndef KRB5CHECKAUTH
2018 authentp = NULL;
2019 #else
2020 #if KRB5CHECKAUTH == 0
2021 authentp = NULL;
2022 #endif
2023 #endif /* KRB5CHECKAUTH */
2024
2025 if (authentp == NULL || authentp->length == 0) return 0;
2026
2027 #ifdef KSSL_DEBUG
2028 {
2029 unsigned int ui;
2030 printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
2031 p = authentp->data;
2032 for (ui=0; ui < authentp->length; ui++) printf("%02x ",p[ui]);
2033 printf("\n");
2034 }
2035 #endif /* KSSL_DEBUG */
2036
2037 unencbufsize = 2 * authentp->length;
2038 if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
2039 {
2040 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2041 "Unable to allocate authenticator buffer.\n");
2042 krb5rc = KRB5KRB_ERR_GENERIC;
2043 goto err;
2044 }
2045
2046 p = (unsigned char *)authentp->data;
2047 if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
2048 (long) authentp->length)) == NULL)
2049 {
2050 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2051 "Error decoding authenticator.\n");
2052 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2053 goto err;
2054 }
2055
2056 enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */
2057 #if !defined(KRB5_MIT_OLD11)
2058 switch ( enctype ) {
2059 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */
2060 case ENCTYPE_DES3_CBC_SHA:
2061 case ENCTYPE_DES3_CBC_RAW:
2062 krb5rc = 0; /* Skip, can't handle derived keys */
2063 goto err;
2064 }
2065 #endif
2066 enc = kssl_map_enc(enctype);
2067 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2068
2069 if (enc == NULL)
2070 {
2071 /* Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.
2072 ** This enctype indicates the authenticator was encrypted
2073 ** using key-usage derived keys which openssl cannot decrypt.
2074 */
2075 goto err;
2076 }
2077
2078 if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0))
2079 {
2080 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2081 "EVP_CipherInit error decrypting authenticator.\n");
2082 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2083 goto err;
2084 }
2085 outl = dec_authent->cipher->length;
2086 if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl))
2087 {
2088 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2089 "EVP_Cipher error decrypting authenticator.\n");
2090 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2091 goto err;
2092 }
2093 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2094
2095 #ifdef KSSL_DEBUG
2096 {
2097 int padl;
2098 printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
2099 for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
2100 printf("\n");
2101 }
2102 #endif /* KSSL_DEBUG */
2103
2104 if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
2105 {
2106 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2107 "confounded by authenticator.\n");
2108 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2109 goto err;
2110 }
2111 outl -= p - unenc_authent;
2112
2113 if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
2114 (long) outl))==NULL)
2115 {
2116 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2117 "Error decoding authenticator body.\n");
2118 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2119 goto err;
2120 }
2121
2122 memset(&tm_time,0,sizeof(struct tm));
2123 if (k_gmtime(auth->ctime, &tm_time) &&
2124 ((tr = mktime(&tm_time)) != (time_t)(-1)))
2125 {
2126 now = time(&now);
2127 tm_l = localtime(&now); tl = mktime(tm_l);
2128 tm_g = gmtime(&now); tg = mktime(tm_g);
2129 tz_offset = tg - tl;
2130
2131 *atimep = (krb5_timestamp)(tr - tz_offset);
2132 }
2133
2134 #ifdef KSSL_DEBUG
2135 printf("kssl_check_authent: returns %d for client time ", *atimep);
2136 if (auth && auth->ctime && auth->ctime->length && auth->ctime->data)
2137 printf("%.*s\n", auth->ctime->length, auth->ctime->data);
2138 else printf("NULL\n");
2139 #endif /* KSSL_DEBUG */
2140
2141 err:
2142 if (auth) KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2143 if (dec_authent) KRB5_ENCDATA_free(dec_authent);
2144 if (unenc_authent) free(unenc_authent);
2145 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2146 return krb5rc;
2147 }
2148
2149
2150 /* Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2151 ** because I dont't know how to stub varargs.
2152 ** Returns krb5_error_code == ENOMEM on alloc error, otherwise
2153 ** passes back newly constructed principal, which should be freed by caller.
2154 */
2155 krb5_error_code kssl_build_principal_2(
2156 /* UPDATE */ krb5_context context,
2157 /* OUT */ krb5_principal *princ,
2158 /* IN */ int rlen, const char *realm,
2159 /* IN */ int slen, const char *svc,
2160 /* IN */ int hlen, const char *host)
2161 {
2162 krb5_data *p_data = NULL;
2163 krb5_principal new_p = NULL;
2164 char *new_r = NULL;
2165
2166 if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL ||
2167 (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
2168 == NULL) goto err;
2169 new_p->length = 2;
2170 new_p->data = p_data;
2171
2172 if ((new_r = calloc(1, rlen + 1)) == NULL) goto err;
2173 memcpy(new_r, realm, rlen);
2174 krb5_princ_set_realm_length(context, new_p, rlen);
2175 krb5_princ_set_realm_data(context, new_p, new_r);
2176
2177 if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) goto err;
2178 memcpy(new_p->data[0].data, svc, slen);
2179 new_p->data[0].length = slen;
2180
2181 if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) goto err;
2182 memcpy(new_p->data[1].data, host, hlen);
2183 new_p->data[1].length = hlen;
2184
2185 krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2186 *princ = new_p;
2187 return 0;
2188
2189 err:
2190 if (new_p && new_p[0].data) free(new_p[0].data);
2191 if (new_p && new_p[1].data) free(new_p[1].data);
2192 if (new_p) free(new_p);
2193 if (new_r) free(new_r);
2194 return ENOMEM;
2195 }
2196
2197 void SSL_set0_kssl_ctx(SSL *s, KSSL_CTX *kctx)
2198 {
2199 s->kssl_ctx = kctx;
2200 }
2201
2202 KSSL_CTX * SSL_get0_kssl_ctx(SSL *s)
2203 {
2204 return s->kssl_ctx;
2205 }
2206
2207 char *kssl_ctx_get0_client_princ(KSSL_CTX *kctx)
2208 {
2209 if (kctx)
2210 return kctx->client_princ;
2211 return NULL;
2212 }
2213
2214 #else /* !OPENSSL_NO_KRB5 */
2215
2216 #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2217 static void *dummy=&dummy;
2218 #endif
2219
2220 #endif /* !OPENSSL_NO_KRB5 */