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