1 /* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */
2 /* Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 2000.
3 */
4 /* ====================================================================
5 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
55 *
56 */
57
58
59 /* ssl/kssl.c -- Routines to support (& debug) Kerberos5 auth for openssl
60 **
61 ** 19990701 VRS Started.
62 ** 200011?? Jeffrey Altman, Richard Levitte
63 ** Generalized for Heimdal, Newer MIT, & Win32.
64 ** Integrated into main OpenSSL 0.9.7 snapshots.
65 ** 20010413 Simon Wilkinson, VRS
66 ** Real RFC2712 KerberosWrapper replaces AP_REQ.
67 */
68
69 #include <openssl/opensslconf.h>
70
71 #define _XOPEN_SOURCE 500 /* glibc2 needs this to declare strptime() */
72 #include <time.h>
73 #if 0 /* experimental */
74 #undef _XOPEN_SOURCE /* To avoid clashes with anything else... */
75 #endif
76 #include <string.h>
77
78 #define KRB5_PRIVATE 1
79
80 #include <openssl/ssl.h>
81 #include <openssl/evp.h>
82 #include <openssl/objects.h>
83 #include <openssl/krb5_asn.h>
84
85 #ifndef OPENSSL_NO_KRB5
86
87 #ifndef ENOMEM
88 #define ENOMEM KRB5KRB_ERR_GENERIC
89 #endif
90
91 /*
92 * When OpenSSL is built on Windows, we do not want to require that
93 * the Kerberos DLLs be available in order for the OpenSSL DLLs to
94 * work. Therefore, all Kerberos routines are loaded at run time
95 * and we do not link to a .LIB file.
96 */
97
98 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
99 /*
100 * The purpose of the following pre-processor statements is to provide
101 * compatibility with different releases of MIT Kerberos for Windows.
102 * All versions up to 1.2 used macros. But macros do not allow for
103 * a binary compatible interface for DLLs. Therefore, all macros are
104 * being replaced by function calls. The following code will allow
105 * an OpenSSL DLL built on Windows to work whether or not the macro
106 * or function form of the routines are utilized.
107 */
108 #ifdef krb5_cc_get_principal
109 #define NO_DEF_KRB5_CCACHE
110 #undef krb5_cc_get_principal
111 #endif
112 #define krb5_cc_get_principal kssl_krb5_cc_get_principal
113
114 #define krb5_free_data_contents kssl_krb5_free_data_contents
115 #define krb5_free_context kssl_krb5_free_context
116 #define krb5_auth_con_free kssl_krb5_auth_con_free
117 #define krb5_free_principal kssl_krb5_free_principal
118 #define krb5_mk_req_extended kssl_krb5_mk_req_extended
119 #define krb5_get_credentials kssl_krb5_get_credentials
120 #define krb5_cc_default kssl_krb5_cc_default
121 #define krb5_sname_to_principal kssl_krb5_sname_to_principal
122 #define krb5_init_context kssl_krb5_init_context
123 #define krb5_free_ticket kssl_krb5_free_ticket
124 #define krb5_rd_req kssl_krb5_rd_req
125 #define krb5_kt_default kssl_krb5_kt_default
126 #define krb5_kt_resolve kssl_krb5_kt_resolve
127 /* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */
128 #ifndef krb5_kt_close
129 #define krb5_kt_close kssl_krb5_kt_close
130 #endif /* krb5_kt_close */
131 #ifndef krb5_kt_get_entry
132 #define krb5_kt_get_entry kssl_krb5_kt_get_entry
133 #endif /* krb5_kt_get_entry */
134 #define krb5_auth_con_init kssl_krb5_auth_con_init
135
136 #define krb5_principal_compare kssl_krb5_principal_compare
137 #define krb5_decrypt_tkt_part kssl_krb5_decrypt_tkt_part
138 #define krb5_timeofday kssl_krb5_timeofday
139 #define krb5_rc_default kssl_krb5_rc_default
140
141 #ifdef krb5_rc_initialize
142 #undef krb5_rc_initialize
143 #endif
144 #define krb5_rc_initialize kssl_krb5_rc_initialize
145
146 #ifdef krb5_rc_get_lifespan
147 #undef krb5_rc_get_lifespan
148 #endif
149 #define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
150
151 #ifdef krb5_rc_destroy
152 #undef krb5_rc_destroy
153 #endif
154 #define krb5_rc_destroy kssl_krb5_rc_destroy
155
156 #define valid_cksumtype kssl_valid_cksumtype
157 #define krb5_checksum_size kssl_krb5_checksum_size
158 #define krb5_kt_free_entry kssl_krb5_kt_free_entry
159 #define krb5_auth_con_setrcache kssl_krb5_auth_con_setrcache
160 #define krb5_auth_con_getrcache kssl_krb5_auth_con_getrcache
161 #define krb5_get_server_rcache kssl_krb5_get_server_rcache
162
163 /* Prototypes for built in stubs */
164 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
165 void kssl_krb5_free_principal(krb5_context, krb5_principal );
166 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
167 krb5_const char *,
168 krb5_keytab *);
169 krb5_error_code kssl_krb5_kt_default(krb5_context,
170 krb5_keytab *);
171 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
172 krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *,
173 krb5_const krb5_data *,
174 krb5_const_principal, krb5_keytab,
175 krb5_flags *,krb5_ticket **);
176
177 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
178 krb5_const_principal);
179 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
180 krb5_auth_context *,
181 krb5_const krb5_flags,
182 krb5_data *,
183 krb5_creds *,
184 krb5_data * );
185 krb5_error_code kssl_krb5_init_context(krb5_context *);
186 void kssl_krb5_free_context(krb5_context);
187 krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache *);
188 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
189 krb5_const char *,
190 krb5_const char *,
191 krb5_int32,
192 krb5_principal *);
193 krb5_error_code kssl_krb5_get_credentials(krb5_context,
194 krb5_const krb5_flags,
195 krb5_ccache,
196 krb5_creds *,
197 krb5_creds * *);
198 krb5_error_code kssl_krb5_auth_con_init(krb5_context,
199 krb5_auth_context *);
200 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context,
201 krb5_ccache cache,
202 krb5_principal *principal);
203 krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
204 size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
205 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
206 krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
207 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context,
208 krb5_auth_context,
209 krb5_rcache);
210 krb5_error_code kssl_krb5_get_server_rcache(krb5_context,
211 krb5_const krb5_data *,
212 krb5_rcache *);
213 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context,
214 krb5_auth_context,
215 krb5_rcache *);
216
217 /* Function pointers (almost all Kerberos functions are _stdcall) */
218 static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
219 =NULL;
220 static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
221 =NULL;
222 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
223 (krb5_context, krb5_const char *, krb5_keytab *)=NULL;
224 static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
225 krb5_keytab *)=NULL;
226 static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context,
227 krb5_ticket *)=NULL;
228 static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context,
229 krb5_auth_context *,
230 krb5_const krb5_data *,
231 krb5_const_principal,
232 krb5_keytab, krb5_flags *,
233 krb5_ticket **)=NULL;
234 static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
235 (krb5_context, krb5_auth_context *,
236 krb5_const krb5_flags, krb5_data *, krb5_creds *,
237 krb5_data * )=NULL;
238 static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
239 static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
240 static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
241 krb5_ccache *)=NULL;
242 static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
243 (krb5_context, krb5_const char *, krb5_const char *,
244 krb5_int32, krb5_principal *)=NULL;
245 static krb5_error_code (_stdcall *p_krb5_get_credentials)
246 (krb5_context, krb5_const krb5_flags, krb5_ccache,
247 krb5_creds *, krb5_creds **)=NULL;
248 static krb5_error_code (_stdcall *p_krb5_auth_con_init)
249 (krb5_context, krb5_auth_context *)=NULL;
250 static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
251 (krb5_context context, krb5_ccache cache,
252 krb5_principal *principal)=NULL;
253 static krb5_error_code (_stdcall *p_krb5_auth_con_free)
254 (krb5_context, krb5_auth_context)=NULL;
255 static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
256 (krb5_context, krb5_const krb5_keyblock *,
257 krb5_ticket *)=NULL;
258 static krb5_error_code (_stdcall *p_krb5_timeofday)
259 (krb5_context context, krb5_int32 *timeret)=NULL;
260 static krb5_error_code (_stdcall *p_krb5_rc_default)
261 (krb5_context context, krb5_rcache *rc)=NULL;
262 static krb5_error_code (_stdcall *p_krb5_rc_initialize)
263 (krb5_context context, krb5_rcache rc,
264 krb5_deltat lifespan)=NULL;
265 static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
266 (krb5_context context, krb5_rcache rc,
267 krb5_deltat *lifespan)=NULL;
268 static krb5_error_code (_stdcall *p_krb5_rc_destroy)
269 (krb5_context context, krb5_rcache rc)=NULL;
270 static krb5_boolean (_stdcall *p_krb5_principal_compare)
271 (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
272 static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
273 static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
274 static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
275 (krb5_context,krb5_keytab_entry * )=NULL;
276 static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context,
277 krb5_auth_context,
278 krb5_rcache)=NULL;
279 static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context,
280 krb5_const krb5_data *,
281 krb5_rcache *)=NULL;
282 static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context,
283 krb5_auth_context,
284 krb5_rcache *)=NULL;
285 static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context,
286 krb5_keytab keytab)=NULL;
287 static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context,
288 krb5_keytab keytab,
289 krb5_const_principal principal, krb5_kvno vno,
290 krb5_enctype enctype, krb5_keytab_entry *entry)=NULL;
291 static int krb5_loaded = 0; /* only attempt to initialize func ptrs once */
292
293 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
294 void
load_krb5_dll(void)295 load_krb5_dll(void)
296 {
297 HANDLE hKRB5_32;
298
299 krb5_loaded++;
300 hKRB5_32 = LoadLibrary(TEXT("KRB5_32"));
301 if (!hKRB5_32)
302 return;
303
304 (FARPROC) p_krb5_free_data_contents =
305 GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
306 (FARPROC) p_krb5_free_context =
307 GetProcAddress( hKRB5_32, "krb5_free_context" );
308 (FARPROC) p_krb5_auth_con_free =
309 GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
310 (FARPROC) p_krb5_free_principal =
311 GetProcAddress( hKRB5_32, "krb5_free_principal" );
312 (FARPROC) p_krb5_mk_req_extended =
313 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
314 (FARPROC) p_krb5_get_credentials =
315 GetProcAddress( hKRB5_32, "krb5_get_credentials" );
316 (FARPROC) p_krb5_cc_get_principal =
317 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
318 (FARPROC) p_krb5_cc_default =
319 GetProcAddress( hKRB5_32, "krb5_cc_default" );
320 (FARPROC) p_krb5_sname_to_principal =
321 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
322 (FARPROC) p_krb5_init_context =
323 GetProcAddress( hKRB5_32, "krb5_init_context" );
324 (FARPROC) p_krb5_free_ticket =
325 GetProcAddress( hKRB5_32, "krb5_free_ticket" );
326 (FARPROC) p_krb5_rd_req =
327 GetProcAddress( hKRB5_32, "krb5_rd_req" );
328 (FARPROC) p_krb5_principal_compare =
329 GetProcAddress( hKRB5_32, "krb5_principal_compare" );
330 (FARPROC) p_krb5_decrypt_tkt_part =
331 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
332 (FARPROC) p_krb5_timeofday =
333 GetProcAddress( hKRB5_32, "krb5_timeofday" );
334 (FARPROC) p_krb5_rc_default =
335 GetProcAddress( hKRB5_32, "krb5_rc_default" );
336 (FARPROC) p_krb5_rc_initialize =
337 GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
338 (FARPROC) p_krb5_rc_get_lifespan =
339 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
340 (FARPROC) p_krb5_rc_destroy =
341 GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
342 (FARPROC) p_krb5_kt_default =
343 GetProcAddress( hKRB5_32, "krb5_kt_default" );
344 (FARPROC) p_krb5_kt_resolve =
345 GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
346 (FARPROC) p_krb5_auth_con_init =
347 GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
348 (FARPROC) p_valid_cksumtype =
349 GetProcAddress( hKRB5_32, "valid_cksumtype" );
350 (FARPROC) p_krb5_checksum_size =
351 GetProcAddress( hKRB5_32, "krb5_checksum_size" );
352 (FARPROC) p_krb5_kt_free_entry =
353 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
354 (FARPROC) p_krb5_auth_con_setrcache =
355 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
356 (FARPROC) p_krb5_get_server_rcache =
357 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
358 (FARPROC) p_krb5_auth_con_getrcache =
359 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
360 (FARPROC) p_krb5_kt_close =
361 GetProcAddress( hKRB5_32, "krb5_kt_close" );
362 (FARPROC) p_krb5_kt_get_entry =
363 GetProcAddress( hKRB5_32, "krb5_kt_get_entry" );
364 }
365
366 /* Stubs for each function to be dynamicly loaded */
367 void
kssl_krb5_free_data_contents(krb5_context CO,krb5_data * data)368 kssl_krb5_free_data_contents(krb5_context CO, krb5_data * data)
369 {
370 if (!krb5_loaded)
371 load_krb5_dll();
372
373 if ( p_krb5_free_data_contents )
374 p_krb5_free_data_contents(CO,data);
375 }
376
377 krb5_error_code
kssl_krb5_mk_req_extended(krb5_context CO,krb5_auth_context * pACO,krb5_const krb5_flags F,krb5_data * pD1,krb5_creds * pC,krb5_data * pD2)378 kssl_krb5_mk_req_extended (krb5_context CO,
379 krb5_auth_context * pACO,
380 krb5_const krb5_flags F,
381 krb5_data * pD1,
382 krb5_creds * pC,
383 krb5_data * pD2)
384 {
385 if (!krb5_loaded)
386 load_krb5_dll();
387
388 if ( p_krb5_mk_req_extended )
389 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
390 else
391 return KRB5KRB_ERR_GENERIC;
392 }
393 krb5_error_code
kssl_krb5_auth_con_init(krb5_context CO,krb5_auth_context * pACO)394 kssl_krb5_auth_con_init(krb5_context CO,
395 krb5_auth_context * pACO)
396 {
397 if (!krb5_loaded)
398 load_krb5_dll();
399
400 if ( p_krb5_auth_con_init )
401 return(p_krb5_auth_con_init(CO,pACO));
402 else
403 return KRB5KRB_ERR_GENERIC;
404 }
405 krb5_error_code
kssl_krb5_auth_con_free(krb5_context CO,krb5_auth_context ACO)406 kssl_krb5_auth_con_free (krb5_context CO,
407 krb5_auth_context ACO)
408 {
409 if (!krb5_loaded)
410 load_krb5_dll();
411
412 if ( p_krb5_auth_con_free )
413 return(p_krb5_auth_con_free(CO,ACO));
414 else
415 return KRB5KRB_ERR_GENERIC;
416 }
417 krb5_error_code
kssl_krb5_get_credentials(krb5_context CO,krb5_const krb5_flags F,krb5_ccache CC,krb5_creds * pCR,krb5_creds ** ppCR)418 kssl_krb5_get_credentials(krb5_context CO,
419 krb5_const krb5_flags F,
420 krb5_ccache CC,
421 krb5_creds * pCR,
422 krb5_creds ** ppCR)
423 {
424 if (!krb5_loaded)
425 load_krb5_dll();
426
427 if ( p_krb5_get_credentials )
428 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
429 else
430 return KRB5KRB_ERR_GENERIC;
431 }
432 krb5_error_code
kssl_krb5_sname_to_principal(krb5_context CO,krb5_const char * pC1,krb5_const char * pC2,krb5_int32 I,krb5_principal * pPR)433 kssl_krb5_sname_to_principal(krb5_context CO,
434 krb5_const char * pC1,
435 krb5_const char * pC2,
436 krb5_int32 I,
437 krb5_principal * pPR)
438 {
439 if (!krb5_loaded)
440 load_krb5_dll();
441
442 if ( p_krb5_sname_to_principal )
443 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
444 else
445 return KRB5KRB_ERR_GENERIC;
446 }
447
448 krb5_error_code
kssl_krb5_cc_default(krb5_context CO,krb5_ccache * pCC)449 kssl_krb5_cc_default(krb5_context CO,
450 krb5_ccache * pCC)
451 {
452 if (!krb5_loaded)
453 load_krb5_dll();
454
455 if ( p_krb5_cc_default )
456 return(p_krb5_cc_default(CO,pCC));
457 else
458 return KRB5KRB_ERR_GENERIC;
459 }
460
461 krb5_error_code
kssl_krb5_init_context(krb5_context * pCO)462 kssl_krb5_init_context(krb5_context * pCO)
463 {
464 if (!krb5_loaded)
465 load_krb5_dll();
466
467 if ( p_krb5_init_context )
468 return(p_krb5_init_context(pCO));
469 else
470 return KRB5KRB_ERR_GENERIC;
471 }
472
473 void
kssl_krb5_free_context(krb5_context CO)474 kssl_krb5_free_context(krb5_context CO)
475 {
476 if (!krb5_loaded)
477 load_krb5_dll();
478
479 if ( p_krb5_free_context )
480 p_krb5_free_context(CO);
481 }
482
483 void
kssl_krb5_free_principal(krb5_context c,krb5_principal p)484 kssl_krb5_free_principal(krb5_context c, krb5_principal p)
485 {
486 if (!krb5_loaded)
487 load_krb5_dll();
488
489 if ( p_krb5_free_principal )
490 p_krb5_free_principal(c,p);
491 }
492
493 krb5_error_code
kssl_krb5_kt_resolve(krb5_context con,krb5_const char * sz,krb5_keytab * kt)494 kssl_krb5_kt_resolve(krb5_context con,
495 krb5_const char * sz,
496 krb5_keytab * kt)
497 {
498 if (!krb5_loaded)
499 load_krb5_dll();
500
501 if ( p_krb5_kt_resolve )
502 return(p_krb5_kt_resolve(con,sz,kt));
503 else
504 return KRB5KRB_ERR_GENERIC;
505 }
506
507 krb5_error_code
kssl_krb5_kt_default(krb5_context con,krb5_keytab * kt)508 kssl_krb5_kt_default(krb5_context con,
509 krb5_keytab * kt)
510 {
511 if (!krb5_loaded)
512 load_krb5_dll();
513
514 if ( p_krb5_kt_default )
515 return(p_krb5_kt_default(con,kt));
516 else
517 return KRB5KRB_ERR_GENERIC;
518 }
519
520 krb5_error_code
kssl_krb5_free_ticket(krb5_context con,krb5_ticket * kt)521 kssl_krb5_free_ticket(krb5_context con,
522 krb5_ticket * kt)
523 {
524 if (!krb5_loaded)
525 load_krb5_dll();
526
527 if ( p_krb5_free_ticket )
528 return(p_krb5_free_ticket(con,kt));
529 else
530 return KRB5KRB_ERR_GENERIC;
531 }
532
533 krb5_error_code
kssl_krb5_rd_req(krb5_context con,krb5_auth_context * pacon,krb5_const krb5_data * data,krb5_const_principal princ,krb5_keytab keytab,krb5_flags * flags,krb5_ticket ** pptkt)534 kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
535 krb5_const krb5_data * data,
536 krb5_const_principal princ, krb5_keytab keytab,
537 krb5_flags * flags, krb5_ticket ** pptkt)
538 {
539 if (!krb5_loaded)
540 load_krb5_dll();
541
542 if ( p_krb5_rd_req )
543 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
544 else
545 return KRB5KRB_ERR_GENERIC;
546 }
547
548 krb5_boolean
krb5_principal_compare(krb5_context con,krb5_const_principal princ1,krb5_const_principal princ2)549 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
550 krb5_const_principal princ2)
551 {
552 if (!krb5_loaded)
553 load_krb5_dll();
554
555 if ( p_krb5_principal_compare )
556 return(p_krb5_principal_compare(con,princ1,princ2));
557 else
558 return KRB5KRB_ERR_GENERIC;
559 }
560
561 krb5_error_code
krb5_decrypt_tkt_part(krb5_context con,krb5_const krb5_keyblock * keys,krb5_ticket * ticket)562 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
563 krb5_ticket *ticket)
564 {
565 if (!krb5_loaded)
566 load_krb5_dll();
567
568 if ( p_krb5_decrypt_tkt_part )
569 return(p_krb5_decrypt_tkt_part(con,keys,ticket));
570 else
571 return KRB5KRB_ERR_GENERIC;
572 }
573
574 krb5_error_code
krb5_timeofday(krb5_context con,krb5_int32 * timeret)575 krb5_timeofday(krb5_context con, krb5_int32 *timeret)
576 {
577 if (!krb5_loaded)
578 load_krb5_dll();
579
580 if ( p_krb5_timeofday )
581 return(p_krb5_timeofday(con,timeret));
582 else
583 return KRB5KRB_ERR_GENERIC;
584 }
585
586 krb5_error_code
krb5_rc_default(krb5_context con,krb5_rcache * rc)587 krb5_rc_default(krb5_context con, krb5_rcache *rc)
588 {
589 if (!krb5_loaded)
590 load_krb5_dll();
591
592 if ( p_krb5_rc_default )
593 return(p_krb5_rc_default(con,rc));
594 else
595 return KRB5KRB_ERR_GENERIC;
596 }
597
598 krb5_error_code
krb5_rc_initialize(krb5_context con,krb5_rcache rc,krb5_deltat lifespan)599 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
600 {
601 if (!krb5_loaded)
602 load_krb5_dll();
603
604 if ( p_krb5_rc_initialize )
605 return(p_krb5_rc_initialize(con, rc, lifespan));
606 else
607 return KRB5KRB_ERR_GENERIC;
608 }
609
610 krb5_error_code
krb5_rc_get_lifespan(krb5_context con,krb5_rcache rc,krb5_deltat * lifespanp)611 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
612 {
613 if (!krb5_loaded)
614 load_krb5_dll();
615
616 if ( p_krb5_rc_get_lifespan )
617 return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
618 else
619 return KRB5KRB_ERR_GENERIC;
620 }
621
622 krb5_error_code
krb5_rc_destroy(krb5_context con,krb5_rcache rc)623 krb5_rc_destroy(krb5_context con, krb5_rcache rc)
624 {
625 if (!krb5_loaded)
626 load_krb5_dll();
627
628 if ( p_krb5_rc_destroy )
629 return(p_krb5_rc_destroy(con, rc));
630 else
631 return KRB5KRB_ERR_GENERIC;
632 }
633
634 size_t
krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)635 krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
636 {
637 if (!krb5_loaded)
638 load_krb5_dll();
639
640 if ( p_krb5_checksum_size )
641 return(p_krb5_checksum_size(context, ctype));
642 else
643 return KRB5KRB_ERR_GENERIC;
644 }
645
646 krb5_boolean
valid_cksumtype(krb5_cksumtype ctype)647 valid_cksumtype(krb5_cksumtype ctype)
648 {
649 if (!krb5_loaded)
650 load_krb5_dll();
651
652 if ( p_valid_cksumtype )
653 return(p_valid_cksumtype(ctype));
654 else
655 return KRB5KRB_ERR_GENERIC;
656 }
657
658 krb5_error_code
krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)659 krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
660 {
661 if (!krb5_loaded)
662 load_krb5_dll();
663
664 if ( p_krb5_kt_free_entry )
665 return(p_krb5_kt_free_entry(con,entry));
666 else
667 return KRB5KRB_ERR_GENERIC;
668 }
669
670 /* Structure definitions */
671 #ifndef NO_DEF_KRB5_CCACHE
672 #ifndef krb5_x
673 #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
674 #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
675 #endif
676
677 typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */
678
679 typedef struct _krb5_ccache
680 {
681 krb5_magic magic;
682 struct _krb5_cc_ops FAR *ops;
683 krb5_pointer data;
684 } *krb5_ccache;
685
686 typedef struct _krb5_cc_ops
687 {
688 krb5_magic magic;
689 char *prefix;
690 char * (KRB5_CALLCONV *get_name)
691 (krb5_context, krb5_ccache);
692 krb5_error_code (KRB5_CALLCONV *resolve)
693 (krb5_context, krb5_ccache *, const char *);
694 krb5_error_code (KRB5_CALLCONV *gen_new)
695 (krb5_context, krb5_ccache *);
696 krb5_error_code (KRB5_CALLCONV *init)
697 (krb5_context, krb5_ccache, krb5_principal);
698 krb5_error_code (KRB5_CALLCONV *destroy)
699 (krb5_context, krb5_ccache);
700 krb5_error_code (KRB5_CALLCONV *close)
701 (krb5_context, krb5_ccache);
702 krb5_error_code (KRB5_CALLCONV *store)
703 (krb5_context, krb5_ccache, krb5_creds *);
704 krb5_error_code (KRB5_CALLCONV *retrieve)
705 (krb5_context, krb5_ccache,
706 krb5_flags, krb5_creds *, krb5_creds *);
707 krb5_error_code (KRB5_CALLCONV *get_princ)
708 (krb5_context, krb5_ccache, krb5_principal *);
709 krb5_error_code (KRB5_CALLCONV *get_first)
710 (krb5_context, krb5_ccache, krb5_cc_cursor *);
711 krb5_error_code (KRB5_CALLCONV *get_next)
712 (krb5_context, krb5_ccache,
713 krb5_cc_cursor *, krb5_creds *);
714 krb5_error_code (KRB5_CALLCONV *end_get)
715 (krb5_context, krb5_ccache, krb5_cc_cursor *);
716 krb5_error_code (KRB5_CALLCONV *remove_cred)
717 (krb5_context, krb5_ccache,
718 krb5_flags, krb5_creds *);
719 krb5_error_code (KRB5_CALLCONV *set_flags)
720 (krb5_context, krb5_ccache, krb5_flags);
721 } krb5_cc_ops;
722 #endif /* NO_DEF_KRB5_CCACHE */
723
724 krb5_error_code
kssl_krb5_cc_get_principal(krb5_context context,krb5_ccache cache,krb5_principal * principal)725 kssl_krb5_cc_get_principal
726 (krb5_context context, krb5_ccache cache,
727 krb5_principal *principal)
728 {
729 if ( p_krb5_cc_get_principal )
730 return(p_krb5_cc_get_principal(context,cache,principal));
731 else
732 return(krb5_x
733 ((cache)->ops->get_princ,(context, cache, principal)));
734 }
735
736 krb5_error_code
kssl_krb5_auth_con_setrcache(krb5_context con,krb5_auth_context acon,krb5_rcache rcache)737 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
738 krb5_rcache rcache)
739 {
740 if ( p_krb5_auth_con_setrcache )
741 return(p_krb5_auth_con_setrcache(con,acon,rcache));
742 else
743 return KRB5KRB_ERR_GENERIC;
744 }
745
746 krb5_error_code
kssl_krb5_get_server_rcache(krb5_context con,krb5_const krb5_data * data,krb5_rcache * rcache)747 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
748 krb5_rcache * rcache)
749 {
750 if ( p_krb5_get_server_rcache )
751 return(p_krb5_get_server_rcache(con,data,rcache));
752 else
753 return KRB5KRB_ERR_GENERIC;
754 }
755
756 krb5_error_code
kssl_krb5_auth_con_getrcache(krb5_context con,krb5_auth_context acon,krb5_rcache * prcache)757 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
758 krb5_rcache * prcache)
759 {
760 if ( p_krb5_auth_con_getrcache )
761 return(p_krb5_auth_con_getrcache(con,acon, prcache));
762 else
763 return KRB5KRB_ERR_GENERIC;
764 }
765
766 krb5_error_code
kssl_krb5_kt_close(krb5_context context,krb5_keytab keytab)767 kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab)
768 {
769 if ( p_krb5_kt_close )
770 return(p_krb5_kt_close(context,keytab));
771 else
772 return KRB5KRB_ERR_GENERIC;
773 }
774
775 krb5_error_code
kssl_krb5_kt_get_entry(krb5_context context,krb5_keytab keytab,krb5_const_principal principal,krb5_kvno vno,krb5_enctype enctype,krb5_keytab_entry * entry)776 kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
777 krb5_const_principal principal, krb5_kvno vno,
778 krb5_enctype enctype, krb5_keytab_entry *entry)
779 {
780 if ( p_krb5_kt_get_entry )
781 return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry));
782 else
783 return KRB5KRB_ERR_GENERIC;
784 }
785 #endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
786
787 char
kstring(char * string)788 *kstring(char *string)
789 {
790 static char *null = "[NULL]";
791
792 return ((string == NULL)? null: string);
793 }
794
795 /* Given KRB5 enctype (basically DES or 3DES),
796 ** return closest match openssl EVP_ encryption algorithm.
797 ** Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes.
798 ** Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK.
799 */
800 const EVP_CIPHER *
kssl_map_enc(krb5_enctype enctype)801 kssl_map_enc(krb5_enctype enctype)
802 {
803 switch (enctype)
804 {
805 case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */
806 case ENCTYPE_DES_CBC_CRC:
807 case ENCTYPE_DES_CBC_MD4:
808 case ENCTYPE_DES_CBC_MD5:
809 case ENCTYPE_DES_CBC_RAW:
810 return EVP_des_cbc();
811 break;
812 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */
813 case ENCTYPE_DES3_CBC_SHA:
814 case ENCTYPE_DES3_CBC_RAW:
815 return EVP_des_ede3_cbc();
816 break;
817 default: return NULL;
818 break;
819 }
820 }
821
822
823 /* Return true:1 if p "looks like" the start of the real authenticator
824 ** described in kssl_skip_confound() below. The ASN.1 pattern is
825 ** "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
826 ** xx and yy are possibly multi-byte length fields.
827 */
kssl_test_confound(unsigned char * p)828 int kssl_test_confound(unsigned char *p)
829 {
830 int len = 2;
831 int xx = 0, yy = 0;
832
833 if (*p++ != 0x62) return 0;
834 if (*p > 0x82) return 0;
835 switch(*p) {
836 case 0x82: p++; xx = (*p++ << 8); xx += *p++; break;
837 case 0x81: p++; xx = *p++; break;
838 case 0x80: return 0;
839 default: xx = *p++; break;
840 }
841 if (*p++ != 0x30) return 0;
842 if (*p > 0x82) return 0;
843 switch(*p) {
844 case 0x82: p++; len+=2; yy = (*p++ << 8); yy += *p++; break;
845 case 0x81: p++; len++; yy = *p++; break;
846 case 0x80: return 0;
847 default: yy = *p++; break;
848 }
849
850 return (xx - len == yy)? 1: 0;
851 }
852
853 /* Allocate, fill, and return cksumlens array of checksum lengths.
854 ** This array holds just the unique elements from the krb5_cksumarray[].
855 ** array[n] == 0 signals end of data.
856 **
857 ** The krb5_cksumarray[] was an internal variable that has since been
858 ** replaced by a more general method for storing the data. It should
859 ** not be used. Instead we use real API calls and make a guess for
860 ** what the highest assigned CKSUMTYPE_ constant is. As of 1.2.2
861 ** it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3). So we will use 0x0010.
862 */
populate_cksumlens(void)863 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))) return NULL;
876
877 for (i=0; i < n; i++) {
878 if (!valid_cksumtype(i)) continue; /* array has holes */
879 for (j=0; j < n; j++) {
880 if (cklens[j] == 0) {
881 cklens[j] = krb5_checksum_size(NULL,i);
882 break; /* krb5 elem was new: add */
883 }
884 if (cklens[j] == krb5_checksum_size(NULL,i)) {
885 break; /* ignore duplicate elements */
886 }
887 }
888 }
889 #endif /* KRB5CHECKAUTH */
890
891 return cklens;
892 }
893
894 /* Return pointer to start of real authenticator within authenticator, or
895 ** return NULL on error.
896 ** Decrypted authenticator looks like this:
897 ** [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
898 ** This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
899 ** krb5_auth_con_getcksumtype() function advertised in its krb5.h.
900 */
kssl_skip_confound(krb5_enctype etype,unsigned char * a)901 unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
902 {
903 int i, conlen;
904 size_t cklen;
905 static size_t *cksumlens = NULL;
906 unsigned char *test_auth;
907
908 conlen = (etype)? 8: 0;
909
910 if (!cksumlens && !(cksumlens = populate_cksumlens())) return NULL;
911 for (i=0; (cklen = cksumlens[i]) != 0; i++)
912 {
913 test_auth = a + conlen + cklen;
914 if (kssl_test_confound(test_auth)) return test_auth;
915 }
916
917 return NULL;
918 }
919
920
921 /* Set kssl_err error info when reason text is a simple string
922 ** kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
923 */
924 void
kssl_err_set(KSSL_ERR * kssl_err,int reason,char * text)925 kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
926 {
927 if (kssl_err == NULL) return;
928
929 kssl_err->reason = reason;
930 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text);
931 return;
932 }
933
934
935 /* Display contents of krb5_data struct, for debugging
936 */
937 void
print_krb5_data(char * label,krb5_data * kdata)938 print_krb5_data(char *label, krb5_data *kdata)
939 {
940 int i;
941
942 printf("%s[%d] ", label, kdata->length);
943 for (i=0; i < (int)kdata->length; i++)
944 {
945 if (0 && isprint((int) kdata->data[i]))
946 printf( "%c ", kdata->data[i]);
947 else
948 printf( "%02x ", (unsigned char) kdata->data[i]);
949 }
950 printf("\n");
951 }
952
953
954 /* Display contents of krb5_authdata struct, for debugging
955 */
956 void
print_krb5_authdata(char * label,krb5_authdata ** adata)957 print_krb5_authdata(char *label, krb5_authdata **adata)
958 {
959 if (adata == NULL)
960 {
961 printf("%s, authdata==0\n", label);
962 return;
963 }
964 printf("%s [%p]\n", label, (void *)adata);
965 #if 0
966 {
967 int i;
968 printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
969 for (i=0; i < adata->length; i++)
970 {
971 printf((isprint(adata->contents[i]))? "%c ": "%02x",
972 adata->contents[i]);
973 }
974 printf("\n");
975 }
976 #endif
977 }
978
979
980 /* Display contents of krb5_keyblock struct, for debugging
981 */
982 void
print_krb5_keyblock(char * label,krb5_keyblock * keyblk)983 print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
984 {
985 int i;
986
987 if (keyblk == NULL)
988 {
989 printf("%s, keyblk==0\n", label);
990 return;
991 }
992 #ifdef KRB5_HEIMDAL
993 printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
994 keyblk->keyvalue->length);
995 for (i=0; i < (int)keyblk->keyvalue->length; i++)
996 {
997 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
998 }
999 printf("\n");
1000 #else
1001 printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
1002 for (i=0; i < (int)keyblk->length; i++)
1003 {
1004 printf("%02x",keyblk->contents[i]);
1005 }
1006 printf("\n");
1007 #endif
1008 }
1009
1010
1011 /* Display contents of krb5_principal_data struct, for debugging
1012 ** (krb5_principal is typedef'd == krb5_principal_data *)
1013 */
1014 void
print_krb5_princ(char * label,krb5_principal_data * princ)1015 print_krb5_princ(char *label, krb5_principal_data *princ)
1016 {
1017 int i, ui, uj;
1018
1019 printf("%s principal Realm: ", label);
1020 if (princ == NULL) return;
1021 for (ui=0; ui < (int)princ->realm.length; ui++) putchar(princ->realm.data[ui]);
1022 printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
1023 for (i=0; i < (int)princ->length; i++)
1024 {
1025 printf("\t%d [%d]: ", i, princ->data[i].length);
1026 for (uj=0; uj < (int)princ->data[i].length; uj++) {
1027 putchar(princ->data[i].data[uj]);
1028 }
1029 printf("\n");
1030 }
1031 return;
1032 }
1033
1034
1035 /* Given krb5 service (typically "kssl") and hostname in kssl_ctx,
1036 ** Return encrypted Kerberos ticket for service @ hostname.
1037 ** If authenp is non-NULL, also return encrypted authenticator,
1038 ** whose data should be freed by caller.
1039 ** (Originally was: Create Kerberos AP_REQ message for SSL Client.)
1040 **
1041 ** 19990628 VRS Started; Returns Kerberos AP_REQ message.
1042 ** 20010409 VRS Modified for RFC2712; Returns enc tkt.
1043 ** 20010606 VRS May also return optional authenticator.
1044 */
1045 krb5_error_code
kssl_cget_tkt(KSSL_CTX * kssl_ctx,krb5_data ** enc_ticketp,krb5_data * authenp,KSSL_ERR * kssl_err)1046 kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
1047 /* OUT */ krb5_data **enc_ticketp,
1048 /* UPDATE */ krb5_data *authenp,
1049 /* OUT */ KSSL_ERR *kssl_err)
1050 {
1051 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1052 krb5_context krb5context = NULL;
1053 krb5_auth_context krb5auth_context = NULL;
1054 krb5_ccache krb5ccdef = NULL;
1055 krb5_creds krb5creds, *krb5credsp = NULL;
1056 krb5_data krb5_app_req;
1057
1058 kssl_err_set(kssl_err, 0, "");
1059 memset((char *)&krb5creds, 0, sizeof(krb5creds));
1060
1061 if (!kssl_ctx)
1062 {
1063 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1064 "No kssl_ctx defined.\n");
1065 goto err;
1066 }
1067 else if (!kssl_ctx->service_host)
1068 {
1069 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1070 "kssl_ctx service_host undefined.\n");
1071 goto err;
1072 }
1073
1074 if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1075 {
1076 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1077 "krb5_init_context() fails: %d\n", krb5rc);
1078 kssl_err->reason = SSL_R_KRB5_C_INIT;
1079 goto err;
1080 }
1081
1082 if ((krb5rc = krb5_sname_to_principal(krb5context,
1083 kssl_ctx->service_host,
1084 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1085 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1086 {
1087 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1088 "krb5_sname_to_principal() fails for %s/%s\n",
1089 kssl_ctx->service_host,
1090 (kssl_ctx->service_name)? kssl_ctx->service_name:
1091 KRB5SVC);
1092 kssl_err->reason = SSL_R_KRB5_C_INIT;
1093 goto err;
1094 }
1095
1096 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1097 {
1098 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1099 "krb5_cc_default fails.\n");
1100 goto err;
1101 }
1102
1103 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1104 &krb5creds.client)) != 0)
1105 {
1106 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1107 "krb5_cc_get_principal() fails.\n");
1108 goto err;
1109 }
1110
1111 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1112 &krb5creds, &krb5credsp)) != 0)
1113 {
1114 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1115 "krb5_get_credentials() fails.\n");
1116 goto err;
1117 }
1118
1119 *enc_ticketp = &krb5credsp->ticket;
1120 #ifdef KRB5_HEIMDAL
1121 kssl_ctx->enctype = krb5credsp->session.keytype;
1122 #else
1123 kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1124 #endif
1125
1126 krb5rc = KRB5KRB_ERR_GENERIC;
1127 /* caller should free data of krb5_app_req */
1128 /* 20010406 VRS deleted for real KerberosWrapper
1129 ** 20010605 VRS reinstated to offer Authenticator to KerberosWrapper
1130 */
1131 krb5_app_req.length = 0;
1132 if (authenp)
1133 {
1134 krb5_data krb5in_data;
1135 const unsigned char *p;
1136 long arlen;
1137 KRB5_APREQBODY *ap_req;
1138
1139 authenp->length = 0;
1140 krb5in_data.data = NULL;
1141 krb5in_data.length = 0;
1142 if ((krb5rc = krb5_mk_req_extended(krb5context,
1143 &krb5auth_context, 0, &krb5in_data, krb5credsp,
1144 &krb5_app_req)) != 0)
1145 {
1146 kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1147 "krb5_mk_req_extended() fails.\n");
1148 goto err;
1149 }
1150
1151 arlen = krb5_app_req.length;
1152 p = (unsigned char *)krb5_app_req.data;
1153 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
1154 if (ap_req)
1155 {
1156 authenp->length = i2d_KRB5_ENCDATA(
1157 ap_req->authenticator, NULL);
1158 if (authenp->length &&
1159 (authenp->data = malloc(authenp->length)))
1160 {
1161 unsigned char *adp = (unsigned char *)authenp->data;
1162 authenp->length = i2d_KRB5_ENCDATA(
1163 ap_req->authenticator, &adp);
1164 }
1165 }
1166
1167 if (ap_req) KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1168 if (krb5_app_req.length)
1169 kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1170 }
1171 #ifdef KRB5_HEIMDAL
1172 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1173 {
1174 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1175 "kssl_ctx_setkey() fails.\n");
1176 }
1177 #else
1178 if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1179 {
1180 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1181 "kssl_ctx_setkey() fails.\n");
1182 }
1183 #endif
1184 else krb5rc = 0;
1185
1186 err:
1187 #ifdef KSSL_DEBUG
1188 kssl_ctx_show(kssl_ctx);
1189 #endif /* KSSL_DEBUG */
1190
1191 if (krb5creds.client) krb5_free_principal(krb5context,
1192 krb5creds.client);
1193 if (krb5creds.server) krb5_free_principal(krb5context,
1194 krb5creds.server);
1195 if (krb5auth_context) krb5_auth_con_free(krb5context,
1196 krb5auth_context);
1197 if (krb5context) krb5_free_context(krb5context);
1198 return (krb5rc);
1199 }
1200
1201
1202 /* Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1203 ** Return Kerberos error code and kssl_err struct on error.
1204 ** Allocates krb5_ticket and krb5_principal; caller should free these.
1205 **
1206 ** 20010410 VRS Implemented krb5_decode_ticket() as
1207 ** old_krb5_decode_ticket(). Missing from MIT1.0.6.
1208 ** 20010615 VRS Re-cast as openssl/asn1 d2i_*() functions.
1209 ** Re-used some of the old krb5_decode_ticket()
1210 ** code here. This tkt should alloc/free just
1211 ** like the real thing.
1212 */
1213 krb5_error_code
kssl_TKT2tkt(krb5_context krb5context,KRB5_TKTBODY * asn1ticket,krb5_ticket ** krb5ticket,KSSL_ERR * kssl_err)1214 kssl_TKT2tkt( /* IN */ krb5_context krb5context,
1215 /* IN */ KRB5_TKTBODY *asn1ticket,
1216 /* OUT */ krb5_ticket **krb5ticket,
1217 /* OUT */ KSSL_ERR *kssl_err )
1218 {
1219 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1220 krb5_ticket *new5ticket = NULL;
1221 ASN1_GENERALSTRING *gstr_svc, *gstr_host;
1222
1223 *krb5ticket = NULL;
1224
1225 if (asn1ticket == NULL || asn1ticket->realm == NULL ||
1226 asn1ticket->sname == NULL ||
1227 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2)
1228 {
1229 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1230 "Null field in asn1ticket.\n");
1231 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1232 return KRB5KRB_ERR_GENERIC;
1233 }
1234
1235 if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
1236 {
1237 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1238 "Unable to allocate new krb5_ticket.\n");
1239 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1240 return ENOMEM; /* or KRB5KRB_ERR_GENERIC; */
1241 }
1242
1243 gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0);
1244 gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1);
1245
1246 if ((krb5rc = kssl_build_principal_2(krb5context,
1247 &new5ticket->server,
1248 asn1ticket->realm->length, (char *)asn1ticket->realm->data,
1249 gstr_svc->length, (char *)gstr_svc->data,
1250 gstr_host->length, (char *)gstr_host->data)) != 0)
1251 {
1252 free(new5ticket);
1253 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1254 "Error building ticket server principal.\n");
1255 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1256 return krb5rc; /* or KRB5KRB_ERR_GENERIC; */
1257 }
1258
1259 krb5_princ_type(krb5context, new5ticket->server) =
1260 asn1ticket->sname->nametype->data[0];
1261 new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1262 new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1263 new5ticket->enc_part.ciphertext.length =
1264 asn1ticket->encdata->cipher->length;
1265 if ((new5ticket->enc_part.ciphertext.data =
1266 calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
1267 {
1268 free(new5ticket);
1269 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1270 "Error allocating cipher in krb5ticket.\n");
1271 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1272 return KRB5KRB_ERR_GENERIC;
1273 }
1274 else
1275 {
1276 memcpy(new5ticket->enc_part.ciphertext.data,
1277 asn1ticket->encdata->cipher->data,
1278 asn1ticket->encdata->cipher->length);
1279 }
1280
1281 *krb5ticket = new5ticket;
1282 return 0;
1283 }
1284
1285
1286 /* Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1287 ** and krb5 AP_REQ message & message length,
1288 ** Return Kerberos session key and client principle
1289 ** to SSL Server in KSSL_CTX *kssl_ctx.
1290 **
1291 ** 19990702 VRS Started.
1292 */
1293 krb5_error_code
kssl_sget_tkt(KSSL_CTX * kssl_ctx,krb5_data * indata,krb5_ticket_times * ttimes,KSSL_ERR * kssl_err)1294 kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
1295 /* IN */ krb5_data *indata,
1296 /* OUT */ krb5_ticket_times *ttimes,
1297 /* OUT */ KSSL_ERR *kssl_err )
1298 {
1299 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1300 static krb5_context krb5context = NULL;
1301 static krb5_auth_context krb5auth_context = NULL;
1302 krb5_ticket *krb5ticket = NULL;
1303 KRB5_TKTBODY *asn1ticket = NULL;
1304 const unsigned char *p;
1305 krb5_keytab krb5keytab = NULL;
1306 krb5_keytab_entry kt_entry;
1307 krb5_principal krb5server;
1308 krb5_rcache rcache = NULL;
1309
1310 kssl_err_set(kssl_err, 0, "");
1311
1312 if (!kssl_ctx)
1313 {
1314 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1315 "No kssl_ctx defined.\n");
1316 goto err;
1317 }
1318
1319 #ifdef KSSL_DEBUG
1320 printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
1321 #endif /* KSSL_DEBUG */
1322
1323 if (!krb5context && (krb5rc = krb5_init_context(&krb5context)))
1324 {
1325 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1326 "krb5_init_context() fails.\n");
1327 goto err;
1328 }
1329 if (krb5auth_context &&
1330 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
1331 {
1332 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1333 "krb5_auth_con_free() fails.\n");
1334 goto err;
1335 }
1336 else krb5auth_context = NULL;
1337 if (!krb5auth_context &&
1338 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
1339 {
1340 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1341 "krb5_auth_con_init() fails.\n");
1342 goto err;
1343 }
1344
1345
1346 if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1347 &rcache)))
1348 {
1349 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1350 "krb5_auth_con_getrcache() fails.\n");
1351 goto err;
1352 }
1353
1354 if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1355 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1356 KRB5_NT_SRV_HST, &krb5server)) != 0)
1357 {
1358 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1359 "krb5_sname_to_principal() fails.\n");
1360 goto err;
1361 }
1362
1363 if (rcache == NULL)
1364 {
1365 if ((krb5rc = krb5_get_server_rcache(krb5context,
1366 krb5_princ_component(krb5context, krb5server, 0),
1367 &rcache)))
1368 {
1369 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1370 "krb5_get_server_rcache() fails.\n");
1371 goto err;
1372 }
1373 }
1374
1375 if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
1376 {
1377 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1378 "krb5_auth_con_setrcache() fails.\n");
1379 goto err;
1380 }
1381
1382
1383 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default
1384 */
1385 if (kssl_ctx->keytab_file)
1386 {
1387 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1388 &krb5keytab);
1389 if (krb5rc)
1390 {
1391 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1392 "krb5_kt_resolve() fails.\n");
1393 goto err;
1394 }
1395 }
1396 else
1397 {
1398 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1399 if (krb5rc)
1400 {
1401 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1402 "krb5_kt_default() fails.\n");
1403 goto err;
1404 }
1405 }
1406
1407 /* Actual Kerberos5 krb5_recvauth() has initial conversation here
1408 ** o check KRB5_SENDAUTH_BADAUTHVERS
1409 ** unless KRB5_RECVAUTH_SKIP_VERSION
1410 ** o check KRB5_SENDAUTH_BADAPPLVERS
1411 ** o send "0" msg if all OK
1412 */
1413
1414 /* 20010411 was using AP_REQ instead of true KerberosWrapper
1415 **
1416 ** if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1417 ** &krb5in_data, krb5server, krb5keytab,
1418 ** &ap_option, &krb5ticket)) != 0) { Error }
1419 */
1420
1421 p = (unsigned char *)indata->data;
1422 if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
1423 (long) indata->length)) == NULL)
1424 {
1425 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1426 "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1427 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1428 goto err;
1429 }
1430
1431 /* Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
1432 if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1433 kssl_err)) != 0)
1434 {
1435 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1436 "Error converting ASN.1 ticket to krb5_ticket.\n");
1437 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1438 goto err;
1439 }
1440
1441 if (! krb5_principal_compare(krb5context, krb5server,
1442 krb5ticket->server)) {
1443 krb5rc = KRB5_PRINC_NOMATCH;
1444 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1445 "server principal != ticket principal\n");
1446 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1447 goto err;
1448 }
1449 if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1450 krb5ticket->server, krb5ticket->enc_part.kvno,
1451 krb5ticket->enc_part.enctype, &kt_entry)) != 0) {
1452 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1453 "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1454 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1455 goto err;
1456 }
1457 if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1458 krb5ticket)) != 0) {
1459 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1460 "krb5_decrypt_tkt_part() failed.\n");
1461 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1462 goto err;
1463 }
1464 else {
1465 krb5_kt_free_entry(krb5context, &kt_entry);
1466 #ifdef KSSL_DEBUG
1467 {
1468 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1469 printf("Decrypted ticket fields:\n");
1470 printf("\tflags: %X, transit-type: %X",
1471 krb5ticket->enc_part2->flags,
1472 krb5ticket->enc_part2->transited.tr_type);
1473 print_krb5_data("\ttransit-data: ",
1474 &(krb5ticket->enc_part2->transited.tr_contents));
1475 printf("\tcaddrs: %p, authdata: %p\n",
1476 krb5ticket->enc_part2->caddrs,
1477 krb5ticket->enc_part2->authorization_data);
1478 if (paddr)
1479 {
1480 printf("\tcaddrs:\n");
1481 for (i=0; paddr[i] != NULL; i++)
1482 {
1483 krb5_data d;
1484 d.length=paddr[i]->length;
1485 d.data=paddr[i]->contents;
1486 print_krb5_data("\t\tIP: ", &d);
1487 }
1488 }
1489 printf("\tstart/auth/end times: %d / %d / %d\n",
1490 krb5ticket->enc_part2->times.starttime,
1491 krb5ticket->enc_part2->times.authtime,
1492 krb5ticket->enc_part2->times.endtime);
1493 }
1494 #endif /* KSSL_DEBUG */
1495 }
1496
1497 krb5rc = KRB5_NO_TKT_SUPPLIED;
1498 if (!krb5ticket || !krb5ticket->enc_part2 ||
1499 !krb5ticket->enc_part2->client ||
1500 !krb5ticket->enc_part2->client->data ||
1501 !krb5ticket->enc_part2->session)
1502 {
1503 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1504 "bad ticket from krb5_rd_req.\n");
1505 }
1506 else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1507 &krb5ticket->enc_part2->client->realm,
1508 krb5ticket->enc_part2->client->data,
1509 krb5ticket->enc_part2->client->length))
1510 {
1511 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1512 "kssl_ctx_setprinc() fails.\n");
1513 }
1514 else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
1515 {
1516 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1517 "kssl_ctx_setkey() fails.\n");
1518 }
1519 else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
1520 {
1521 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1522 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1523 "invalid ticket from krb5_rd_req.\n");
1524 }
1525 else krb5rc = 0;
1526
1527 kssl_ctx->enctype = krb5ticket->enc_part.enctype;
1528 ttimes->authtime = krb5ticket->enc_part2->times.authtime;
1529 ttimes->starttime = krb5ticket->enc_part2->times.starttime;
1530 ttimes->endtime = krb5ticket->enc_part2->times.endtime;
1531 ttimes->renew_till = krb5ticket->enc_part2->times.renew_till;
1532
1533 err:
1534 #ifdef KSSL_DEBUG
1535 kssl_ctx_show(kssl_ctx);
1536 #endif /* KSSL_DEBUG */
1537
1538 if (asn1ticket) KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1539 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab);
1540 if (krb5ticket) krb5_free_ticket(krb5context, krb5ticket);
1541 if (krb5server) krb5_free_principal(krb5context, krb5server);
1542 return (krb5rc);
1543 }
1544
1545
1546 /* Allocate & return a new kssl_ctx struct.
1547 */
1548 KSSL_CTX *
kssl_ctx_new(void)1549 kssl_ctx_new(void)
1550 {
1551 return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX)));
1552 }
1553
1554
1555 /* Frees a kssl_ctx struct and any allocated memory it holds.
1556 ** Returns NULL.
1557 */
1558 KSSL_CTX *
kssl_ctx_free(KSSL_CTX * kssl_ctx)1559 kssl_ctx_free(KSSL_CTX *kssl_ctx)
1560 {
1561 if (kssl_ctx == NULL) return kssl_ctx;
1562
1563 if (kssl_ctx->key) OPENSSL_cleanse(kssl_ctx->key,
1564 kssl_ctx->length);
1565 if (kssl_ctx->key) free(kssl_ctx->key);
1566 if (kssl_ctx->client_princ) free(kssl_ctx->client_princ);
1567 if (kssl_ctx->service_host) free(kssl_ctx->service_host);
1568 if (kssl_ctx->service_name) free(kssl_ctx->service_name);
1569 if (kssl_ctx->keytab_file) free(kssl_ctx->keytab_file);
1570
1571 free(kssl_ctx);
1572 return (KSSL_CTX *) NULL;
1573 }
1574
1575
1576 /* Given an array of (krb5_data *) entity (and optional realm),
1577 ** set the plain (char *) client_princ or service_host member
1578 ** of the kssl_ctx struct.
1579 */
1580 krb5_error_code
kssl_ctx_setprinc(KSSL_CTX * kssl_ctx,int which,krb5_data * realm,krb5_data * entity,int nentities)1581 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1582 krb5_data *realm, krb5_data *entity, int nentities)
1583 {
1584 char **princ;
1585 int length;
1586 int i;
1587
1588 if (kssl_ctx == NULL || entity == NULL) return KSSL_CTX_ERR;
1589
1590 switch (which)
1591 {
1592 case KSSL_CLIENT: princ = &kssl_ctx->client_princ; break;
1593 case KSSL_SERVER: princ = &kssl_ctx->service_host; break;
1594 default: return KSSL_CTX_ERR; break;
1595 }
1596 if (*princ) free(*princ);
1597
1598 /* Add up all the entity->lengths */
1599 length = 0;
1600 for (i=0; i < nentities; i++)
1601 {
1602 length += entity[i].length;
1603 }
1604 /* Add in space for the '/' character(s) (if any) */
1605 length += nentities-1;
1606 /* Space for the ('@'+realm+NULL | NULL) */
1607 length += ((realm)? realm->length + 2: 1);
1608
1609 if ((*princ = calloc(1, length)) == NULL)
1610 return KSSL_CTX_ERR;
1611 else
1612 {
1613 for (i = 0; i < nentities; i++)
1614 {
1615 strncat(*princ, entity[i].data, entity[i].length);
1616 if (i < nentities-1)
1617 {
1618 strcat (*princ, "/");
1619 }
1620 }
1621 if (realm)
1622 {
1623 strcat (*princ, "@");
1624 (void) strncat(*princ, realm->data, realm->length);
1625 }
1626 }
1627
1628 return KSSL_CTX_OK;
1629 }
1630
1631
1632 /* Set one of the plain (char *) string members of the kssl_ctx struct.
1633 ** Default values should be:
1634 ** which == KSSL_SERVICE => "khost" (KRB5SVC)
1635 ** which == KSSL_KEYTAB => "/etc/krb5.keytab" (KRB5KEYTAB)
1636 */
1637 krb5_error_code
kssl_ctx_setstring(KSSL_CTX * kssl_ctx,int which,char * text)1638 kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1639 {
1640 char **string;
1641
1642 if (!kssl_ctx) return KSSL_CTX_ERR;
1643
1644 switch (which)
1645 {
1646 case KSSL_SERVICE: string = &kssl_ctx->service_name; break;
1647 case KSSL_SERVER: string = &kssl_ctx->service_host; break;
1648 case KSSL_CLIENT: string = &kssl_ctx->client_princ; break;
1649 case KSSL_KEYTAB: string = &kssl_ctx->keytab_file; break;
1650 default: return KSSL_CTX_ERR; break;
1651 }
1652 if (*string) free(*string);
1653
1654 if (!text)
1655 {
1656 *string = '\0';
1657 return KSSL_CTX_OK;
1658 }
1659
1660 if ((*string = calloc(1, strlen(text) + 1)) == NULL)
1661 return KSSL_CTX_ERR;
1662 else
1663 strcpy(*string, text);
1664
1665 return KSSL_CTX_OK;
1666 }
1667
1668
1669 /* Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1670 ** struct. Clear kssl_ctx->key if Kerberos session key is NULL.
1671 */
1672 krb5_error_code
kssl_ctx_setkey(KSSL_CTX * kssl_ctx,krb5_keyblock * session)1673 kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1674 {
1675 int length;
1676 krb5_enctype enctype;
1677 krb5_octet FAR *contents = NULL;
1678
1679 if (!kssl_ctx) return KSSL_CTX_ERR;
1680
1681 if (kssl_ctx->key)
1682 {
1683 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
1684 free(kssl_ctx->key);
1685 }
1686
1687 if (session)
1688 {
1689
1690 #ifdef KRB5_HEIMDAL
1691 length = session->keyvalue->length;
1692 enctype = session->keytype;
1693 contents = session->keyvalue->contents;
1694 #else
1695 length = session->length;
1696 enctype = session->enctype;
1697 contents = session->contents;
1698 #endif
1699 kssl_ctx->enctype = enctype;
1700 kssl_ctx->length = length;
1701 }
1702 else
1703 {
1704 kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1705 kssl_ctx->length = 0;
1706 return KSSL_CTX_OK;
1707 }
1708
1709 if ((kssl_ctx->key =
1710 (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL)
1711 {
1712 kssl_ctx->length = 0;
1713 return KSSL_CTX_ERR;
1714 }
1715 else
1716 memcpy(kssl_ctx->key, contents, length);
1717
1718 return KSSL_CTX_OK;
1719 }
1720
1721
1722 /* Display contents of kssl_ctx struct
1723 */
1724 void
kssl_ctx_show(KSSL_CTX * kssl_ctx)1725 kssl_ctx_show(KSSL_CTX *kssl_ctx)
1726 {
1727 int i;
1728
1729 printf("kssl_ctx: ");
1730 if (kssl_ctx == NULL)
1731 {
1732 printf("NULL\n");
1733 return;
1734 }
1735 else
1736 printf("%p\n", (void *)kssl_ctx);
1737
1738 printf("\tservice:\t%s\n",
1739 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
1740 printf("\tclient:\t%s\n",
1741 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
1742 printf("\tserver:\t%s\n",
1743 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
1744 printf("\tkeytab:\t%s\n",
1745 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
1746 printf("\tkey [%d:%d]:\t",
1747 kssl_ctx->enctype, kssl_ctx->length);
1748
1749 for (i=0; i < kssl_ctx->length && kssl_ctx->key; i++)
1750 {
1751 printf("%02x", kssl_ctx->key[i]);
1752 }
1753 printf("\n");
1754 return;
1755 }
1756
1757 int
kssl_keytab_is_available(KSSL_CTX * kssl_ctx)1758 kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1759 {
1760 krb5_context krb5context = NULL;
1761 krb5_keytab krb5keytab = NULL;
1762 krb5_keytab_entry entry;
1763 krb5_principal princ = NULL;
1764 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1765 int rc = 0;
1766
1767 if ((krb5rc = krb5_init_context(&krb5context)))
1768 return(0);
1769
1770 /* kssl_ctx->keytab_file == NULL ==> use Kerberos default
1771 */
1772 if (kssl_ctx->keytab_file)
1773 {
1774 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1775 &krb5keytab);
1776 if (krb5rc)
1777 goto exit;
1778 }
1779 else
1780 {
1781 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1782 if (krb5rc)
1783 goto exit;
1784 }
1785
1786 /* the host key we are looking for */
1787 krb5rc = krb5_sname_to_principal(krb5context, NULL,
1788 kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
1789 KRB5_NT_SRV_HST, &princ);
1790
1791 krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1792 princ,
1793 0 /* IGNORE_VNO */,
1794 0 /* IGNORE_ENCTYPE */,
1795 &entry);
1796 if ( krb5rc == KRB5_KT_NOTFOUND ) {
1797 rc = 1;
1798 goto exit;
1799 } else if ( krb5rc )
1800 goto exit;
1801
1802 krb5_kt_free_entry(krb5context, &entry);
1803 rc = 1;
1804
1805 exit:
1806 if (krb5keytab) krb5_kt_close(krb5context, krb5keytab);
1807 if (princ) krb5_free_principal(krb5context, princ);
1808 if (krb5context) krb5_free_context(krb5context);
1809 return(rc);
1810 }
1811
1812 int
kssl_tgt_is_available(KSSL_CTX * kssl_ctx)1813 kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1814 {
1815 krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1816 krb5_context krb5context = NULL;
1817 krb5_ccache krb5ccdef = NULL;
1818 krb5_creds krb5creds, *krb5credsp = NULL;
1819 int rc = 0;
1820
1821 memset((char *)&krb5creds, 0, sizeof(krb5creds));
1822
1823 if (!kssl_ctx)
1824 return(0);
1825
1826 if (!kssl_ctx->service_host)
1827 return(0);
1828
1829 if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1830 goto err;
1831
1832 if ((krb5rc = krb5_sname_to_principal(krb5context,
1833 kssl_ctx->service_host,
1834 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1835 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1836 goto err;
1837
1838 if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1839 goto err;
1840
1841 if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1842 &krb5creds.client)) != 0)
1843 goto err;
1844
1845 if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1846 &krb5creds, &krb5credsp)) != 0)
1847 goto err;
1848
1849 rc = 1;
1850
1851 err:
1852 #ifdef KSSL_DEBUG
1853 kssl_ctx_show(kssl_ctx);
1854 #endif /* KSSL_DEBUG */
1855
1856 if (krb5creds.client) krb5_free_principal(krb5context, krb5creds.client);
1857 if (krb5creds.server) krb5_free_principal(krb5context, krb5creds.server);
1858 if (krb5context) krb5_free_context(krb5context);
1859 return(rc);
1860 }
1861
1862 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
kssl_krb5_free_data_contents(krb5_context context,krb5_data * data)1863 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1864 {
1865 #ifdef KRB5_HEIMDAL
1866 data->length = 0;
1867 if (data->data)
1868 free(data->data);
1869 #elif defined(KRB5_MIT_OLD11)
1870 if (data->data) {
1871 krb5_xfree(data->data);
1872 data->data = 0;
1873 }
1874 #else
1875 krb5_free_data_contents(NULL, data);
1876 #endif
1877 }
1878 #endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1879
1880
1881 /* Given pointers to KerberosTime and struct tm structs, convert the
1882 ** KerberosTime string to struct tm. Note that KerberosTime is a
1883 ** ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional
1884 ** seconds as defined in RFC 1510.
1885 ** Return pointer to the (partially) filled in struct tm on success,
1886 ** return NULL on failure.
1887 */
k_gmtime(ASN1_GENERALIZEDTIME * gtime,struct tm * k_tm)1888 struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
1889 {
1890 char c, *p;
1891
1892 if (!k_tm) return NULL;
1893 if (gtime == NULL || gtime->length < 14) return NULL;
1894 if (gtime->data == NULL) return NULL;
1895
1896 p = (char *)>ime->data[14];
1897
1898 c = *p; *p = '\0'; p -= 2; k_tm->tm_sec = atoi(p); *(p+2) = c;
1899 c = *p; *p = '\0'; p -= 2; k_tm->tm_min = atoi(p); *(p+2) = c;
1900 c = *p; *p = '\0'; p -= 2; k_tm->tm_hour = atoi(p); *(p+2) = c;
1901 c = *p; *p = '\0'; p -= 2; k_tm->tm_mday = atoi(p); *(p+2) = c;
1902 c = *p; *p = '\0'; p -= 2; k_tm->tm_mon = atoi(p)-1; *(p+2) = c;
1903 c = *p; *p = '\0'; p -= 4; k_tm->tm_year = atoi(p)-1900; *(p+4) = c;
1904
1905 return k_tm;
1906 }
1907
1908
1909 /* Helper function for kssl_validate_times().
1910 ** We need context->clockskew, but krb5_context is an opaque struct.
1911 ** So we try to sneek the clockskew out through the replay cache.
1912 ** If that fails just return a likely default (300 seconds).
1913 */
get_rc_clockskew(krb5_context context)1914 krb5_deltat get_rc_clockskew(krb5_context context)
1915 {
1916 krb5_rcache rc;
1917 krb5_deltat clockskew;
1918
1919 if (krb5_rc_default(context, &rc)) return KSSL_CLOCKSKEW;
1920 if (krb5_rc_initialize(context, rc, 0)) return KSSL_CLOCKSKEW;
1921 if (krb5_rc_get_lifespan(context, rc, &clockskew)) {
1922 clockskew = KSSL_CLOCKSKEW;
1923 }
1924 (void) krb5_rc_destroy(context, rc);
1925 return clockskew;
1926 }
1927
1928
1929 /* kssl_validate_times() combines (and more importantly exposes)
1930 ** the MIT KRB5 internal function krb5_validate_times() and the
1931 ** in_clock_skew() macro. The authenticator client time is checked
1932 ** to be within clockskew secs of the current time and the current
1933 ** time is checked to be within the ticket start and expire times.
1934 ** Either check may be omitted by supplying a NULL value.
1935 ** Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
1936 ** See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
1937 ** 20010420 VRS
1938 */
kssl_validate_times(krb5_timestamp atime,krb5_ticket_times * ttimes)1939 krb5_error_code kssl_validate_times( krb5_timestamp atime,
1940 krb5_ticket_times *ttimes)
1941 {
1942 krb5_deltat skew;
1943 krb5_timestamp start, now;
1944 krb5_error_code rc;
1945 krb5_context context;
1946
1947 if ((rc = krb5_init_context(&context))) return SSL_R_KRB5_S_BAD_TICKET;
1948 skew = get_rc_clockskew(context);
1949 if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
1950 krb5_free_context(context);
1951
1952 if (atime && labs(atime - now) >= skew) return SSL_R_KRB5_S_TKT_SKEW;
1953
1954 if (! ttimes) return 0;
1955
1956 start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
1957 if (start - now > skew) return SSL_R_KRB5_S_TKT_NYV;
1958 if ((now - ttimes->endtime) > skew) return SSL_R_KRB5_S_TKT_EXPIRED;
1959
1960 #ifdef KSSL_DEBUG
1961 printf("kssl_validate_times: %d |<- | %d - %d | < %d ->| %d\n",
1962 start, atime, now, skew, ttimes->endtime);
1963 #endif /* KSSL_DEBUG */
1964
1965 return 0;
1966 }
1967
1968
1969 /* Decode and decrypt given DER-encoded authenticator, then pass
1970 ** authenticator ctime back in *atimep (or 0 if time unavailable).
1971 ** Returns krb5_error_code and kssl_err on error. A NULL
1972 ** authenticator (authentp->length == 0) is not considered an error.
1973 ** Note that kssl_check_authent() makes use of the KRB5 session key;
1974 ** you must call kssl_sget_tkt() to get the key before calling this routine.
1975 */
kssl_check_authent(KSSL_CTX * kssl_ctx,krb5_data * authentp,krb5_timestamp * atimep,KSSL_ERR * kssl_err)1976 krb5_error_code kssl_check_authent(
1977 /* IN */ KSSL_CTX *kssl_ctx,
1978 /* IN */ krb5_data *authentp,
1979 /* OUT */ krb5_timestamp *atimep,
1980 /* OUT */ KSSL_ERR *kssl_err )
1981 {
1982 krb5_error_code krb5rc = 0;
1983 KRB5_ENCDATA *dec_authent = NULL;
1984 KRB5_AUTHENTBODY *auth = NULL;
1985 krb5_enctype enctype;
1986 EVP_CIPHER_CTX ciph_ctx;
1987 const EVP_CIPHER *enc = NULL;
1988 unsigned char iv[EVP_MAX_IV_LENGTH];
1989 const unsigned char *p;
1990 unsigned char *unenc_authent;
1991 int outl, unencbufsize;
1992 struct tm tm_time, *tm_l, *tm_g;
1993 time_t now, tl, tg, tr, tz_offset;
1994
1995 EVP_CIPHER_CTX_init(&ciph_ctx);
1996 *atimep = 0;
1997 kssl_err_set(kssl_err, 0, "");
1998
1999 #ifndef KRB5CHECKAUTH
2000 authentp = NULL;
2001 #else
2002 #if KRB5CHECKAUTH == 0
2003 authentp = NULL;
2004 #endif
2005 #endif /* KRB5CHECKAUTH */
2006
2007 if (authentp == NULL || authentp->length == 0) return 0;
2008
2009 #ifdef KSSL_DEBUG
2010 {
2011 unsigned int ui;
2012 printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
2013 p = authentp->data;
2014 for (ui=0; ui < authentp->length; ui++) printf("%02x ",p[ui]);
2015 printf("\n");
2016 }
2017 #endif /* KSSL_DEBUG */
2018
2019 unencbufsize = 2 * authentp->length;
2020 if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
2021 {
2022 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2023 "Unable to allocate authenticator buffer.\n");
2024 krb5rc = KRB5KRB_ERR_GENERIC;
2025 goto err;
2026 }
2027
2028 p = (unsigned char *)authentp->data;
2029 if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
2030 (long) authentp->length)) == NULL)
2031 {
2032 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2033 "Error decoding authenticator.\n");
2034 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2035 goto err;
2036 }
2037
2038 enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */
2039 #if !defined(KRB5_MIT_OLD11)
2040 switch ( enctype ) {
2041 case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */
2042 case ENCTYPE_DES3_CBC_SHA:
2043 case ENCTYPE_DES3_CBC_RAW:
2044 krb5rc = 0; /* Skip, can't handle derived keys */
2045 goto err;
2046 }
2047 #endif
2048 enc = kssl_map_enc(enctype);
2049 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2050
2051 if (enc == NULL)
2052 {
2053 /* Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.
2054 ** This enctype indicates the authenticator was encrypted
2055 ** using key-usage derived keys which openssl cannot decrypt.
2056 */
2057 goto err;
2058 }
2059
2060 if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0))
2061 {
2062 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2063 "EVP_CipherInit error decrypting authenticator.\n");
2064 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2065 goto err;
2066 }
2067 outl = dec_authent->cipher->length;
2068 if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl))
2069 {
2070 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2071 "EVP_Cipher error decrypting authenticator.\n");
2072 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2073 goto err;
2074 }
2075 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2076
2077 #ifdef KSSL_DEBUG
2078 printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
2079 for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
2080 printf("\n");
2081 #endif /* KSSL_DEBUG */
2082
2083 if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
2084 {
2085 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2086 "confounded by authenticator.\n");
2087 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2088 goto err;
2089 }
2090 outl -= p - unenc_authent;
2091
2092 if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
2093 (long) outl))==NULL)
2094 {
2095 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2096 "Error decoding authenticator body.\n");
2097 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2098 goto err;
2099 }
2100
2101 memset(&tm_time,0,sizeof(struct tm));
2102 if (k_gmtime(auth->ctime, &tm_time) &&
2103 ((tr = mktime(&tm_time)) != (time_t)(-1)))
2104 {
2105 now = time(&now);
2106 tm_l = localtime(&now); tl = mktime(tm_l);
2107 tm_g = gmtime(&now); tg = mktime(tm_g);
2108 tz_offset = tg - tl;
2109
2110 *atimep = tr - tz_offset;
2111 }
2112
2113 #ifdef KSSL_DEBUG
2114 printf("kssl_check_authent: returns %d for client time ", *atimep);
2115 if (auth && auth->ctime && auth->ctime->length && auth->ctime->data)
2116 printf("%.*s\n", auth->ctime->length, auth->ctime->data);
2117 else printf("NULL\n");
2118 #endif /* KSSL_DEBUG */
2119
2120 err:
2121 if (auth) KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2122 if (dec_authent) KRB5_ENCDATA_free(dec_authent);
2123 if (unenc_authent) free(unenc_authent);
2124 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2125 return krb5rc;
2126 }
2127
2128
2129 /* Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2130 ** because I dont't know how to stub varargs.
2131 ** Returns krb5_error_code == ENOMEM on alloc error, otherwise
2132 ** passes back newly constructed principal, which should be freed by caller.
2133 */
kssl_build_principal_2(krb5_context context,krb5_principal * princ,int rlen,const char * realm,int slen,const char * svc,int hlen,const char * host)2134 krb5_error_code kssl_build_principal_2(
2135 /* UPDATE */ krb5_context context,
2136 /* OUT */ krb5_principal *princ,
2137 /* IN */ int rlen, const char *realm,
2138 /* IN */ int slen, const char *svc,
2139 /* IN */ int hlen, const char *host)
2140 {
2141 krb5_data *p_data = NULL;
2142 krb5_principal new_p = NULL;
2143 char *new_r = NULL;
2144
2145 if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL ||
2146 (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
2147 == NULL) goto err;
2148 new_p->length = 2;
2149 new_p->data = p_data;
2150
2151 if ((new_r = calloc(1, rlen + 1)) == NULL) goto err;
2152 memcpy(new_r, realm, rlen);
2153 krb5_princ_set_realm_length(context, new_p, rlen);
2154 krb5_princ_set_realm_data(context, new_p, new_r);
2155
2156 if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL) goto err;
2157 memcpy(new_p->data[0].data, svc, slen);
2158 new_p->data[0].length = slen;
2159
2160 if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL) goto err;
2161 memcpy(new_p->data[1].data, host, hlen);
2162 new_p->data[1].length = hlen;
2163
2164 krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2165 *princ = new_p;
2166 return 0;
2167
2168 err:
2169 if (new_p && new_p[0].data) free(new_p[0].data);
2170 if (new_p && new_p[1].data) free(new_p[1].data);
2171 if (new_p) free(new_p);
2172 if (new_r) free(new_r);
2173 return ENOMEM;
2174 }
2175
2176
2177 #else /* !OPENSSL_NO_KRB5 */
2178
2179 #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2180 static int dummy=(int)&dummy;
2181 #endif
2182
2183 #endif /* !OPENSSL_NO_KRB5 */
2184
2185