6fd8e7ea0793427f2804087b0b6a67529e745f9f
[openssl.git] / ssl / kssl.c
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 #ifndef OPENSSL_NO_KRB5
71 #define _XOPEN_SOURCE /* glibc2 needs this to declare strptime() */
72 #include <time.h>
73 #include <string.h>
74
75 #include <openssl/ssl.h>
76 #include <openssl/evp.h>
77 #include <openssl/objects.h>
78 #include <openssl/krb5_asn.h>
79
80 /* 
81  * When OpenSSL is built on Windows, we do not want to require that
82  * the Kerberos DLLs be available in order for the OpenSSL DLLs to
83  * work.  Therefore, all Kerberos routines are loaded at run time
84  * and we do not link to a .LIB file.
85  */
86
87 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
88 /* 
89  * The purpose of the following pre-processor statements is to provide
90  * compatibility with different releases of MIT Kerberos for Windows.
91  * All versions up to 1.2 used macros.  But macros do not allow for
92  * a binary compatible interface for DLLs.  Therefore, all macros are
93  * being replaced by function calls.  The following code will allow
94  * an OpenSSL DLL built on Windows to work whether or not the macro
95  * or function form of the routines are utilized.
96  */
97 #ifdef  krb5_cc_get_principal
98 #define NO_DEF_KRB5_CCACHE
99 #undef  krb5_cc_get_principal
100 #endif
101 #define krb5_cc_get_principal    kssl_krb5_cc_get_principal
102
103 #define krb5_free_data_contents  kssl_krb5_free_data_contents   
104 #define krb5_free_context        kssl_krb5_free_context         
105 #define krb5_auth_con_free       kssl_krb5_auth_con_free        
106 #define krb5_free_principal      kssl_krb5_free_principal       
107 #define krb5_mk_req_extended     kssl_krb5_mk_req_extended      
108 #define krb5_get_credentials     kssl_krb5_get_credentials      
109 #define krb5_cc_default          kssl_krb5_cc_default           
110 #define krb5_sname_to_principal  kssl_krb5_sname_to_principal   
111 #define krb5_init_context        kssl_krb5_init_context         
112 #define krb5_free_ticket         kssl_krb5_free_ticket          
113 #define krb5_rd_req              kssl_krb5_rd_req               
114 #define krb5_kt_default          kssl_krb5_kt_default           
115 #define krb5_kt_resolve          kssl_krb5_kt_resolve           
116 #define krb5_auth_con_init       kssl_krb5_auth_con_init        
117
118 #define krb5_principal_compare   kssl_krb5_principal_compare
119 /* macro  #define krb5_kt_get_entry        kssl_krb5_kt_get_entry  */
120 #define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
121 #define krb5_timeofday           kssl_krb5_timeofday
122 #define krb5_rc_default           kssl_krb5_rc_default
123 #define krb5_rc_initialize   kssl_krb5_rc_initialize
124 #define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
125 #define krb5_rc_destroy      kssl_krb5_rc_destroy
126 #define valid_cksumtype      kssl_valid_cksumtype
127 #define krb5_checksum_size   kssl_krb5_checksum_size
128 #define krb5_kt_free_entry   kssl_krb5_kt_free_entry
129 #define krb5_auth_con_setrcache  kssl_krb5_auth_con_setrcache
130 #define krb5_auth_con_getrcache  kssl_krb5_auth_con_getrcache
131 #define krb5_get_server_rcache   kssl_krb5_get_server_rcache
132
133 /* Prototypes for built in stubs */
134 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
135 void kssl_krb5_free_principal(krb5_context, krb5_principal );
136 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
137                                      krb5_const char *,
138                                      krb5_keytab *);
139 krb5_error_code kssl_krb5_kt_default(krb5_context,
140                                      krb5_keytab *);
141 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
142 krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, 
143                                  krb5_const krb5_data *,
144                                  krb5_const_principal, krb5_keytab, 
145                                  krb5_flags *,krb5_ticket **);
146
147 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
148                                          krb5_const_principal);
149 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
150                                           krb5_auth_context  *,
151                                           krb5_const krb5_flags,
152                                           krb5_data  *,
153                                           krb5_creds  *,
154                                           krb5_data  * );
155 krb5_error_code kssl_krb5_init_context(krb5_context *);
156 void kssl_krb5_free_context(krb5_context);
157 krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache  *);
158 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
159                                              krb5_const char  *,
160                                              krb5_const char  *,
161                                              krb5_int32,
162                                              krb5_principal  *);
163 krb5_error_code kssl_krb5_get_credentials(krb5_context,
164                                           krb5_const krb5_flags,
165                                           krb5_ccache,
166                                           krb5_creds  *,
167                                           krb5_creds  *  *);
168 krb5_error_code kssl_krb5_auth_con_init(krb5_context,
169                                         krb5_auth_context  *);
170 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, 
171                                            krb5_ccache cache,
172                                            krb5_principal *principal);
173 krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
174 size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
175 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
176 krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
177 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context, 
178                                              krb5_auth_context, 
179                                              krb5_rcache);
180 krb5_error_code kssl_krb5_get_server_rcache(krb5_context, 
181                                             krb5_const krb5_data *,
182                                             krb5_rcache *);
183 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context, 
184                                              krb5_auth_context,
185                                              krb5_rcache *);
186
187 /* Function pointers (almost all Kerberos functions are _stdcall) */
188 static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
189         =NULL;
190 static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
191         =NULL;
192 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
193                         (krb5_context, krb5_const char *, krb5_keytab *)=NULL;
194 static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
195                                                      krb5_keytab *)=NULL;
196 static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context, 
197                                                       krb5_ticket *)=NULL;
198 static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context, 
199                                                  krb5_auth_context *, 
200                                                  krb5_const krb5_data *,
201                                                  krb5_const_principal, 
202                                                  krb5_keytab, krb5_flags *,
203                                                  krb5_ticket **)=NULL;
204 static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
205                         (krb5_context, krb5_auth_context *,
206                          krb5_const krb5_flags, krb5_data *, krb5_creds *,
207                          krb5_data * )=NULL;
208 static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
209 static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
210 static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
211                                                      krb5_ccache  *)=NULL;
212 static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
213                         (krb5_context, krb5_const char *, krb5_const char *,
214                          krb5_int32, krb5_principal *)=NULL;
215 static krb5_error_code (_stdcall *p_krb5_get_credentials)
216                         (krb5_context, krb5_const krb5_flags, krb5_ccache,
217                          krb5_creds *, krb5_creds **)=NULL;
218 static krb5_error_code (_stdcall *p_krb5_auth_con_init)
219                         (krb5_context, krb5_auth_context *)=NULL;
220 static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
221                         (krb5_context context, krb5_ccache cache,
222                          krb5_principal *principal)=NULL;
223 static krb5_error_code (_stdcall *p_krb5_auth_con_free)
224                         (krb5_context, krb5_auth_context)=NULL;
225 static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
226                         (krb5_context, krb5_const krb5_keyblock *,
227                                            krb5_ticket *)=NULL;
228 static krb5_error_code (_stdcall *p_krb5_timeofday)
229                         (krb5_context context, krb5_int32 *timeret)=NULL;
230 static krb5_error_code (_stdcall *p_krb5_rc_default)
231                         (krb5_context context, krb5_rcache *rc)=NULL;
232 static krb5_error_code (_stdcall *p_krb5_rc_initialize)
233                         (krb5_context context, krb5_rcache rc,
234                                      krb5_deltat lifespan)=NULL;
235 static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
236                         (krb5_context context, krb5_rcache rc,
237                                        krb5_deltat *lifespan)=NULL;
238 static krb5_error_code (_stdcall *p_krb5_rc_destroy)
239                         (krb5_context context, krb5_rcache rc)=NULL;
240 static krb5_boolean (_stdcall *p_krb5_principal_compare)
241                      (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
242 static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
243 static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
244 static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
245                         (krb5_context,krb5_keytab_entry * )=NULL;
246 static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context, 
247                                                                krb5_auth_context, 
248                                                                krb5_rcache)=NULL;
249 static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context, 
250                                                               krb5_const krb5_data *, 
251                                                               krb5_rcache *)=NULL;
252 static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context, 
253                                                       krb5_auth_context,
254                                                       krb5_rcache *)=NULL;
255 static int krb5_loaded = 0;     /* only attempt to initialize func ptrs once */
256
257 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
258 void
259 load_krb5_dll(void)
260         {
261         HANDLE hKRB5_32;
262     
263         krb5_loaded++;
264         hKRB5_32 = LoadLibrary("KRB5_32");
265         if (!hKRB5_32)
266                 return;
267
268         (FARPROC) p_krb5_free_data_contents =
269                 GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
270         (FARPROC) p_krb5_free_context =
271                 GetProcAddress( hKRB5_32, "krb5_free_context" );
272         (FARPROC) p_krb5_auth_con_free =
273                 GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
274         (FARPROC) p_krb5_free_principal =
275                 GetProcAddress( hKRB5_32, "krb5_free_principal" );
276         (FARPROC) p_krb5_mk_req_extended =
277                 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
278         (FARPROC) p_krb5_get_credentials =
279                 GetProcAddress( hKRB5_32, "krb5_get_credentials" );
280         (FARPROC) p_krb5_cc_get_principal =
281                 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
282         (FARPROC) p_krb5_cc_default =
283                 GetProcAddress( hKRB5_32, "krb5_cc_default" );
284         (FARPROC) p_krb5_sname_to_principal =
285                 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
286         (FARPROC) p_krb5_init_context =
287                 GetProcAddress( hKRB5_32, "krb5_init_context" );
288         (FARPROC) p_krb5_free_ticket =
289                 GetProcAddress( hKRB5_32, "krb5_free_ticket" );
290         (FARPROC) p_krb5_rd_req =
291                 GetProcAddress( hKRB5_32, "krb5_rd_req" );
292         (FARPROC) p_krb5_principal_compare =
293                 GetProcAddress( hKRB5_32, "krb5_principal_compare" );
294         (FARPROC) p_krb5_decrypt_tkt_part =
295                 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
296         (FARPROC) p_krb5_timeofday =
297                 GetProcAddress( hKRB5_32, "krb5_timeofday" );
298         (FARPROC) p_krb5_rc_default =
299                 GetProcAddress( hKRB5_32, "krb5_rc_default" );
300         (FARPROC) p_krb5_rc_initialize =
301                 GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
302         (FARPROC) p_krb5_rc_get_lifespan =
303                 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
304         (FARPROC) p_krb5_rc_destroy =
305                 GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
306         (FARPROC) p_krb5_kt_default =
307                 GetProcAddress( hKRB5_32, "krb5_kt_default" );
308         (FARPROC) p_krb5_kt_resolve =
309                 GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
310         (FARPROC) p_krb5_auth_con_init =
311                 GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
312         (FARPROC) p_valid_cksumtype =
313                 GetProcAddress( hKRB5_32, "valid_cksumtype" );
314         (FARPROC) p_krb5_checksum_size =
315                 GetProcAddress( hKRB5_32, "krb5_checksum_size" );
316         (FARPROC) p_krb5_kt_free_entry =
317                 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
318         (FARPROC) p_krb5_auth_con_setrcache =
319                 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
320         (FARPROC) p_krb5_get_server_rcache =
321                 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
322         (FARPROC) p_krb5_auth_con_getrcache =
323                 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
324         }
325
326 /* Stubs for each function to be dynamicly loaded */
327 void
328 kssl_krb5_free_data_contents(krb5_context CO, krb5_data  * data)
329         {
330         if (!krb5_loaded)
331                 load_krb5_dll();
332
333         if ( p_krb5_free_data_contents )
334                 p_krb5_free_data_contents(CO,data);
335         }
336
337 krb5_error_code
338 kssl_krb5_mk_req_extended (krb5_context CO,
339                           krb5_auth_context  * pACO,
340                           krb5_const krb5_flags F,
341                           krb5_data  * pD1,
342                           krb5_creds  * pC,
343                           krb5_data  * pD2)
344         {
345         if (!krb5_loaded)
346                 load_krb5_dll();
347
348         if ( p_krb5_mk_req_extended )
349                 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
350         else
351                 return KRB5KRB_ERR_GENERIC;
352         }
353 krb5_error_code
354 kssl_krb5_auth_con_init(krb5_context CO,
355                        krb5_auth_context  * pACO)
356         {
357         if (!krb5_loaded)
358                 load_krb5_dll();
359
360         if ( p_krb5_auth_con_init )
361                 return(p_krb5_auth_con_init(CO,pACO));
362         else
363                 return KRB5KRB_ERR_GENERIC;
364         }
365 krb5_error_code
366 kssl_krb5_auth_con_free (krb5_context CO,
367                         krb5_auth_context ACO)
368         {
369         if (!krb5_loaded)
370                 load_krb5_dll();
371
372         if ( p_krb5_auth_con_free )
373                 return(p_krb5_auth_con_free(CO,ACO));
374         else
375                 return KRB5KRB_ERR_GENERIC;
376         }
377 krb5_error_code
378 kssl_krb5_get_credentials(krb5_context CO,
379                          krb5_const krb5_flags F,
380                          krb5_ccache CC,
381                          krb5_creds  * pCR,
382                          krb5_creds  ** ppCR)
383         {
384         if (!krb5_loaded)
385                 load_krb5_dll();
386
387         if ( p_krb5_get_credentials )
388                 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
389         else
390                 return KRB5KRB_ERR_GENERIC;
391         }
392 krb5_error_code
393 kssl_krb5_sname_to_principal(krb5_context CO,
394                             krb5_const char  * pC1,
395                             krb5_const char  * pC2,
396                             krb5_int32 I,
397                             krb5_principal  * pPR)
398         {
399         if (!krb5_loaded)
400                 load_krb5_dll();
401
402         if ( p_krb5_sname_to_principal )
403                 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
404         else
405                 return KRB5KRB_ERR_GENERIC;
406         }
407
408 krb5_error_code
409 kssl_krb5_cc_default(krb5_context CO,
410                     krb5_ccache  * pCC)
411         {
412         if (!krb5_loaded)
413                 load_krb5_dll();
414
415         if ( p_krb5_cc_default )
416                 return(p_krb5_cc_default(CO,pCC));
417         else
418                 return KRB5KRB_ERR_GENERIC;
419         }
420
421 krb5_error_code
422 kssl_krb5_init_context(krb5_context * pCO)
423         {
424         if (!krb5_loaded)
425                 load_krb5_dll();
426
427         if ( p_krb5_init_context )
428                 return(p_krb5_init_context(pCO));
429         else
430                 return KRB5KRB_ERR_GENERIC;
431         }
432
433 void
434 kssl_krb5_free_context(krb5_context CO)
435         {
436         if (!krb5_loaded)
437                 load_krb5_dll();
438
439         if ( p_krb5_free_context )
440                 p_krb5_free_context(CO);
441         }
442
443 void
444 kssl_krb5_free_principal(krb5_context c, krb5_principal p)
445         {
446         if (!krb5_loaded)
447                 load_krb5_dll();
448
449         if ( p_krb5_free_principal )
450                 p_krb5_free_principal(c,p);
451         }
452
453 krb5_error_code
454 kssl_krb5_kt_resolve(krb5_context con,
455                     krb5_const char * sz,
456                     krb5_keytab * kt)
457         {
458         if (!krb5_loaded)
459                 load_krb5_dll();
460
461         if ( p_krb5_kt_resolve )
462                 return(p_krb5_kt_resolve(con,sz,kt));
463         else
464                 return KRB5KRB_ERR_GENERIC;
465         }
466
467 krb5_error_code
468 kssl_krb5_kt_default(krb5_context con,
469                     krb5_keytab * kt)
470         {
471         if (!krb5_loaded)
472                 load_krb5_dll();
473
474         if ( p_krb5_kt_default )
475                 return(p_krb5_kt_default(con,kt));
476         else
477                 return KRB5KRB_ERR_GENERIC;
478         }
479
480 krb5_error_code
481 kssl_krb5_free_ticket(krb5_context con,
482                      krb5_ticket * kt)
483         {
484         if (!krb5_loaded)
485                 load_krb5_dll();
486
487         if ( p_krb5_free_ticket )
488                 return(p_krb5_free_ticket(con,kt));
489         else
490                 return KRB5KRB_ERR_GENERIC;
491         }
492
493 krb5_error_code
494 kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
495                 krb5_const krb5_data * data,
496                 krb5_const_principal princ, krb5_keytab keytab,
497                 krb5_flags * flags, krb5_ticket ** pptkt)
498         {
499         if (!krb5_loaded)
500                 load_krb5_dll();
501
502         if ( p_krb5_rd_req )
503                 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
504         else
505                 return KRB5KRB_ERR_GENERIC;
506         }
507
508 krb5_boolean
509 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
510                 krb5_const_principal princ2)
511         {
512         if (!krb5_loaded)
513                 load_krb5_dll();
514
515         if ( p_krb5_principal_compare )
516                 return(p_krb5_principal_compare(con,princ1,princ2));
517         else
518                 return KRB5KRB_ERR_GENERIC;
519         }
520
521 krb5_error_code
522 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
523                 krb5_ticket *ticket)
524         {
525         if (!krb5_loaded)
526                 load_krb5_dll();
527
528         if ( p_krb5_decrypt_tkt_part )
529                 return(p_krb5_decrypt_tkt_part(con,keys,ticket));
530         else
531                 return KRB5KRB_ERR_GENERIC;
532         }
533
534 krb5_error_code
535 krb5_timeofday(krb5_context con, krb5_int32 *timeret)
536         {
537         if (!krb5_loaded)
538                 load_krb5_dll();
539
540         if ( p_krb5_timeofday )
541                 return(p_krb5_timeofday(con,timeret));
542         else
543                 return KRB5KRB_ERR_GENERIC;
544         }
545
546 krb5_error_code
547 krb5_rc_default(krb5_context con, krb5_rcache *rc)
548         {
549         if (!krb5_loaded)
550                 load_krb5_dll();
551
552         if ( p_krb5_rc_default )
553                 return(p_krb5_rc_default(con,rc));
554         else
555                 return KRB5KRB_ERR_GENERIC;
556         }
557
558 krb5_error_code
559 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
560         {
561         if (!krb5_loaded)
562                 load_krb5_dll();
563
564         if ( p_krb5_rc_initialize )
565                 return(p_krb5_rc_initialize(con, rc, lifespan));
566         else
567                 return KRB5KRB_ERR_GENERIC;
568         }
569
570 krb5_error_code
571 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
572         {
573         if (!krb5_loaded)
574                 load_krb5_dll();
575
576         if ( p_krb5_rc_get_lifespan )
577                 return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
578         else
579                 return KRB5KRB_ERR_GENERIC;
580         }
581
582 krb5_error_code
583 krb5_rc_destroy(krb5_context con, krb5_rcache rc)
584         {
585         if (!krb5_loaded)
586                 load_krb5_dll();
587
588         if ( p_krb5_rc_destroy )
589                 return(p_krb5_rc_destroy(con, rc));
590         else
591                 return KRB5KRB_ERR_GENERIC;
592         }
593
594 size_t 
595 krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
596         {
597         if (!krb5_loaded)
598                 load_krb5_dll();
599
600         if ( p_krb5_checksum_size )
601                 return(p_krb5_checksum_size(context, ctype));
602         else
603                 return KRB5KRB_ERR_GENERIC;
604         }
605
606 krb5_boolean 
607 valid_cksumtype(krb5_cksumtype ctype)
608         {
609         if (!krb5_loaded)
610                 load_krb5_dll();
611
612         if ( p_valid_cksumtype )
613                 return(p_valid_cksumtype(ctype));
614         else
615                 return KRB5KRB_ERR_GENERIC;
616         }
617
618 krb5_error_code 
619 krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
620         {
621         if (!krb5_loaded)
622                 load_krb5_dll();
623
624         if ( p_krb5_kt_free_entry )
625                 return(p_krb5_kt_free_entry(con,entry));
626         else
627                 return KRB5KRB_ERR_GENERIC;
628         }
629                  
630 /* Structure definitions  */
631 #ifndef NO_DEF_KRB5_CCACHE
632 #ifndef krb5_x
633 #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
634 #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
635 #endif 
636
637 typedef krb5_pointer    krb5_cc_cursor; /* cursor for sequential lookup */
638
639 typedef struct _krb5_ccache
640         {
641         krb5_magic magic;
642         struct _krb5_cc_ops FAR *ops;
643         krb5_pointer data;
644         } *krb5_ccache;
645
646 typedef struct _krb5_cc_ops
647         {
648         krb5_magic magic;
649         char  *prefix;
650         char  * (KRB5_CALLCONV *get_name)
651                 (krb5_context, krb5_ccache);
652         krb5_error_code (KRB5_CALLCONV *resolve)
653                 (krb5_context, krb5_ccache  *, const char  *);
654         krb5_error_code (KRB5_CALLCONV *gen_new)
655                 (krb5_context, krb5_ccache  *);
656         krb5_error_code (KRB5_CALLCONV *init)
657                 (krb5_context, krb5_ccache, krb5_principal);
658         krb5_error_code (KRB5_CALLCONV *destroy)
659                 (krb5_context, krb5_ccache);
660         krb5_error_code (KRB5_CALLCONV *close)
661                 (krb5_context, krb5_ccache);
662         krb5_error_code (KRB5_CALLCONV *store)
663                 (krb5_context, krb5_ccache, krb5_creds  *);
664         krb5_error_code (KRB5_CALLCONV *retrieve)
665                 (krb5_context, krb5_ccache,
666                 krb5_flags, krb5_creds  *, krb5_creds  *);
667         krb5_error_code (KRB5_CALLCONV *get_princ)
668                 (krb5_context, krb5_ccache, krb5_principal  *);
669         krb5_error_code (KRB5_CALLCONV *get_first)
670                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
671         krb5_error_code (KRB5_CALLCONV *get_next)
672                 (krb5_context, krb5_ccache,
673                 krb5_cc_cursor  *, krb5_creds  *);
674         krb5_error_code (KRB5_CALLCONV *end_get)
675                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
676         krb5_error_code (KRB5_CALLCONV *remove_cred)
677                 (krb5_context, krb5_ccache,
678                 krb5_flags, krb5_creds  *);
679         krb5_error_code (KRB5_CALLCONV *set_flags)
680                 (krb5_context, krb5_ccache, krb5_flags);
681         } krb5_cc_ops;
682 #endif /* NO_DEF_KRB5_CCACHE */
683
684 krb5_error_code 
685 kssl_krb5_cc_get_principal
686     (krb5_context context, krb5_ccache cache,
687       krb5_principal *principal)
688         {
689         if ( p_krb5_cc_get_principal )
690                 return(p_krb5_cc_get_principal(context,cache,principal));
691         else
692                 return(krb5_x
693                         ((cache)->ops->get_princ,(context, cache, principal)));
694         }
695
696 krb5_error_code
697 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
698                              krb5_rcache rcache)
699         {
700         if ( p_krb5_auth_con_setrcache )
701                  return(p_krb5_auth_con_setrcache(con,acon,rcache));
702         else
703                  return KRB5KRB_ERR_GENERIC;
704         }
705
706 krb5_error_code
707 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
708                             krb5_rcache * rcache) 
709         {
710                  if ( p_krb5_get_server_rcache )
711                          return(p_krb5_get_server_rcache(con,data,rcache));
712                  else
713                          return KRB5KRB_ERR_GENERIC;
714         }
715
716 krb5_error_code
717 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
718                              krb5_rcache * prcache)
719         {
720                  if ( p_krb5_auth_con_getrcache )
721                          return(p_krb5_auth_con_getrcache(con,acon, prcache));
722                  else
723                          return KRB5KRB_ERR_GENERIC;
724         }
725 #endif  /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
726
727 char
728 *kstring(char *string)
729         {
730         static char     *null = "[NULL]";
731
732         return ((string == NULL)? null: string);
733         }
734
735 #define MAXKNUM 255
736 char
737 *knumber(int len, krb5_octet *contents)
738         {
739         static char     buf[MAXKNUM+1];
740         int             i;
741
742         BIO_snprintf(buf, MAXKNUM, "[%d] ", len);
743
744         for (i=0; i < len  &&  MAXKNUM > strlen(buf)+3; i++)
745                 {
746                 BIO_snprintf(&buf[strlen(buf)], 3, "%02x", contents[i]);
747                 }
748
749         return (buf);
750         }
751
752
753 /*      Given KRB5 enctype (basically DES or 3DES), return
754 */
755 EVP_CIPHER *
756 kssl_map_enc(krb5_enctype enctype)
757         {
758         switch (enctype)
759                 {
760         case ENCTYPE_DES_CBC_CRC:
761         case ENCTYPE_DES_CBC_MD4:
762         case ENCTYPE_DES_CBC_MD5:
763         case ENCTYPE_DES_CBC_RAW:
764 #if ! defined(KRB5_MIT_OLD11)
765         case ENCTYPE_DES_HMAC_SHA1:
766 #endif
767                                 return (EVP_CIPHER *) EVP_des_cbc();
768                                 break;
769         case ENCTYPE_DES3_CBC_SHA:
770         case ENCTYPE_DES3_CBC_RAW:
771 #if ! defined(KRB5_MIT_OLD11)
772         case ENCTYPE_DES3_CBC_SHA1:
773 #endif
774                                 return (EVP_CIPHER *) EVP_des_ede3_cbc();
775                                 break;
776         default:                return (EVP_CIPHER *) NULL;
777                                 break;
778                 }
779         }
780
781
782 /*      Return true:1 if p "looks like" the start of the real authenticator
783 **      described in kssl_skip_confound() below.  The ASN.1 pattern is
784 **      "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
785 **      xx and yy are possibly multi-byte length fields.
786 */
787 int     kssl_test_confound(unsigned char *p)
788         {
789         int     len = 2;
790         int     xx = 0, yy = 0;
791
792         if (*p++ != 0x62)  return 0;
793         if (*p > 0x82)  return 0;
794         switch(*p)  {
795                 case 0x82:  p++;          xx = (*p++ << 8);  xx += *p++;  break;
796                 case 0x81:  p++;          xx =  *p++;  break;
797                 case 0x80:  return 0;
798                 default:    xx = *p++;  break;
799                 }
800         if (*p++ != 0x30)  return 0;
801         if (*p > 0x82)  return 0;
802         switch(*p)  {
803                 case 0x82:  p++; len+=2;  yy = (*p++ << 8);  yy += *p++;  break;
804                 case 0x81:  p++; len++;   yy =  *p++;  break;
805                 case 0x80:  return 0;
806                 default:    yy = *p++;  break;
807                 }
808
809         return (xx - len == yy)? 1: 0;
810         }
811
812 /*      Allocate, fill, and return cksumlens array of checksum lengths.
813 **      This array holds just the unique elements from the krb5_cksumarray[].
814 **      array[n] == 0 signals end of data.
815 **
816 **      The krb5_cksumarray[] was an internal variable that has since been
817 **      replaced by a more general method for storing the data.  It should
818 **      not be used.  Instead we use real API calls and make a guess for 
819 **      what the highest assigned CKSUMTYPE_ constant is.  As of 1.2.2
820 **      it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3).  So we will use 0x0010.
821 */
822 int     *populate_cksumlens(void)
823         {
824         int             i, j, n = 0x0010+1;
825         static size_t   *cklens = NULL;
826
827 #ifdef KRB5CHECKAUTH
828         if (!cklens && !(cklens = (size_t *) calloc(sizeof(int), n)))  return NULL;
829
830         for (i=0; i < n; i++)  {
831                 if (!valid_cksumtype(i))  continue;     /*  array has holes  */
832                 for (j=0; j < n; j++)  {
833                         if (cklens[j] == 0)  {
834                                 cklens[j] = krb5_checksum_size(NULL,i);
835                                 break;          /*  krb5 elem was new: add   */
836                                 }
837                         if (cklens[j] == krb5_checksum_size(NULL,i))  {
838                                 break;          /*  ignore duplicate elements */
839                                 }
840                         }
841                 }
842 #endif  /* KRB5CHECKAUTH */
843
844         return cklens;
845         }
846
847 /*      Return pointer to start of real authenticator within authenticator, or
848 **      return NULL on error.
849 **      Decrypted authenticator looks like this:
850 **              [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
851 **      This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
852 **      krb5_auth_con_getcksumtype() function advertised in its krb5.h.
853 */
854 unsigned char   *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
855         {
856         int             i, cklen, conlen;
857         static int      *cksumlens = NULL;
858         unsigned char   *test_auth;
859
860         conlen = (etype)? 8: 0;
861
862         if (!cksumlens  &&  !(cksumlens = populate_cksumlens()))  return NULL;
863         for (i=0; (cklen = cksumlens[i]) != 0; i++)
864                 {
865                 test_auth = a + conlen + cklen;
866                 if (kssl_test_confound(test_auth))  return test_auth;
867                 }
868
869         return NULL;
870         }
871
872
873 /*      Set kssl_err error info when reason text is a simple string
874 **              kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
875 */
876 void
877 kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
878         {
879         if (kssl_err == NULL)  return;
880
881         kssl_err->reason = reason;
882         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text);
883         return;
884         }
885
886
887 /*      Display contents of krb5_data struct, for debugging
888 */
889 void
890 print_krb5_data(char *label, krb5_data *kdata)
891         {
892         unsigned int    i;
893
894         printf("%s[%d] ", label, kdata->length);
895         for (i=0; i < kdata->length; i++)
896                 {
897                 if (0 &&  isprint((int) kdata->data[i]))
898                         printf( "%c ",  kdata->data[i]);
899                 else
900                         printf( "%02x ", (unsigned char) kdata->data[i]);
901                 }
902         printf("\n");
903         }
904
905
906 /*      Display contents of krb5_authdata struct, for debugging
907 */
908 void
909 print_krb5_authdata(char *label, krb5_authdata **adata)
910         {
911         if (adata == NULL)
912                 {
913                 printf("%s, authdata==0\n", label);
914                 return;
915                 }
916         printf("%s [%p]\n", label, adata);
917 #if 0
918         {
919         int     i;
920         printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
921         for (i=0; i < adata->length; i++)
922                 {
923                 printf((isprint(adata->contents[i]))? "%c ": "%02x",
924                         adata->contents[i]);
925                 }
926         printf("\n");
927         }
928 #endif
929         }
930
931
932 /*      Display contents of krb5_keyblock struct, for debugging
933 */
934 void
935 print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
936         {
937         unsigned int    i;
938
939         if (keyblk == NULL)
940                 {
941                 printf("%s, keyblk==0\n", label);
942                 return;
943                 }
944 #ifdef KRB5_HEIMDAL
945         printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
946                                            keyblk->keyvalue->length);
947         for (i=0; i < keyblk->keyvalue->length; i++)
948                 {
949                 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
950                 }
951         printf("\n");
952 #else
953         printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
954         for (i=0; i < keyblk->length; i++)
955                 {
956                 printf("%02x",keyblk->contents[i]);
957                 }
958         printf("\n");
959 #endif
960         }
961
962
963 /*      Display contents of krb5_principal_data struct, for debugging
964 **      (krb5_principal is typedef'd == krb5_principal_data *)
965 */
966 void
967 print_krb5_princ(char *label, krb5_principal_data *princ)
968         {
969         unsigned int    ui, uj;
970         int i;
971
972         printf("%s principal Realm: ", label);
973         if (princ == NULL)  return;
974         for (ui=0; ui < princ->realm.length; ui++)  putchar(princ->realm.data[ui]);
975         printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
976         for (i=0; i < princ->length; i++)
977                 {
978                 printf("\t%d [%d]: ", i, princ->data[i].length);
979                 for (uj=0; uj < princ->data[i].length; uj++)  {
980                         putchar(princ->data[i].data[uj]);
981                         }
982                 printf("\n");
983                 }
984         return;
985         }
986
987
988 /*      Given krb5 service (typically "kssl") and hostname in kssl_ctx,
989 **      Return encrypted Kerberos ticket for service @ hostname.
990 **      If authenp is non-NULL, also return encrypted authenticator,
991 **      whose data should be freed by caller.
992 **      (Originally was: Create Kerberos AP_REQ message for SSL Client.)
993 **
994 **      19990628        VRS     Started; Returns Kerberos AP_REQ message.
995 **      20010409        VRS     Modified for RFC2712; Returns enc tkt.
996 **      20010606        VRS     May also return optional authenticator.
997 */
998 krb5_error_code
999 kssl_cget_tkt(  /* UPDATE */    KSSL_CTX *kssl_ctx,
1000                 /* OUT    */    krb5_data **enc_ticketp,
1001                 /* UPDATE */    krb5_data *authenp,
1002                 /* OUT    */    KSSL_ERR *kssl_err)
1003         {
1004         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1005         krb5_context            krb5context = NULL;
1006         krb5_auth_context       krb5auth_context = NULL;
1007         krb5_ccache             krb5ccdef = NULL;
1008         krb5_creds              krb5creds, *krb5credsp = NULL;
1009         krb5_data               krb5_app_req;
1010
1011         kssl_err_set(kssl_err, 0, "");
1012         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1013
1014         if (!kssl_ctx)
1015                 {
1016                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1017                         "No kssl_ctx defined.\n");
1018                 goto err;
1019                 }
1020         else if (!kssl_ctx->service_host)
1021                 {
1022                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1023                         "kssl_ctx service_host undefined.\n");
1024                 goto err;
1025                 }
1026
1027         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1028                 {
1029                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1030                         "krb5_init_context() fails: %d\n", krb5rc);
1031                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1032                 goto err;
1033                 }
1034
1035         if ((krb5rc = krb5_sname_to_principal(krb5context,
1036                 kssl_ctx->service_host,
1037                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1038                 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1039                 {
1040                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1041                         "krb5_sname_to_principal() fails for %s/%s\n",
1042                         kssl_ctx->service_host,
1043                         (kssl_ctx->service_name)? kssl_ctx->service_name:
1044                                                   KRB5SVC);
1045                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1046                 goto err;
1047                 }
1048
1049         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1050                 {
1051                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1052                         "krb5_cc_default fails.\n");
1053                 goto err;
1054                 }
1055
1056         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1057                 &krb5creds.client)) != 0)
1058                 {
1059                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1060                         "krb5_cc_get_principal() fails.\n");
1061                 goto err;
1062                 }
1063
1064         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1065                 &krb5creds, &krb5credsp)) != 0)
1066                 {
1067                 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1068                         "krb5_get_credentials() fails.\n");
1069                 goto err;
1070                 }
1071
1072         *enc_ticketp = &krb5credsp->ticket;
1073 #ifdef KRB5_HEIMDAL
1074         kssl_ctx->enctype = krb5credsp->session.keytype;
1075 #else
1076         kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1077 #endif
1078
1079         krb5rc = KRB5KRB_ERR_GENERIC;
1080         /*      caller should free data of krb5_app_req  */
1081         /*  20010406 VRS deleted for real KerberosWrapper
1082         **  20010605 VRS reinstated to offer Authenticator to KerberosWrapper
1083         */
1084         krb5_app_req.length = 0;
1085         if (authenp)
1086                 {
1087                 krb5_data       krb5in_data;
1088                 unsigned char   *p;
1089                 long            arlen;
1090                 KRB5_APREQBODY  *ap_req;
1091
1092                 authenp->length = 0;
1093                 krb5in_data.data = NULL;
1094                 krb5in_data.length = 0;
1095                 if ((krb5rc = krb5_mk_req_extended(krb5context,
1096                         &krb5auth_context, 0, &krb5in_data, krb5credsp,
1097                         &krb5_app_req)) != 0)
1098                         {
1099                         kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1100                                 "krb5_mk_req_extended() fails.\n");
1101                         goto err;
1102                         }
1103
1104                 arlen = krb5_app_req.length;
1105                 p = krb5_app_req.data;
1106                 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
1107                 if (ap_req)
1108                         {
1109                         authenp->length = i2d_KRB5_ENCDATA(
1110                                         ap_req->authenticator, NULL);
1111                         if (authenp->length  && 
1112                                 (authenp->data = malloc(authenp->length)))
1113                                 {
1114                                 unsigned char   *p = authenp->data;
1115                                 authenp->length = i2d_KRB5_ENCDATA(
1116                                                 ap_req->authenticator, &p);
1117                                 }
1118                         }
1119
1120                 if (ap_req)  KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1121                 if (krb5_app_req.length)  
1122                         kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1123                 }
1124 #ifdef KRB5_HEIMDAL
1125         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1126                 {
1127                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1128                         "kssl_ctx_setkey() fails.\n");
1129                 }
1130 #else
1131         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1132                 {
1133                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1134                         "kssl_ctx_setkey() fails.\n");
1135                 }
1136 #endif
1137         else    krb5rc = 0;
1138
1139  err:
1140 #ifdef KSSL_DEBUG
1141         kssl_ctx_show(kssl_ctx);
1142 #endif  /* KSSL_DEBUG */
1143
1144         if (krb5creds.client)   krb5_free_principal(krb5context,
1145                                                         krb5creds.client);
1146         if (krb5creds.server)   krb5_free_principal(krb5context,
1147                                                         krb5creds.server);
1148         if (krb5auth_context)   krb5_auth_con_free(krb5context,
1149                                                         krb5auth_context);
1150         if (krb5context)        krb5_free_context(krb5context);
1151         return (krb5rc);
1152         }
1153
1154
1155 /*  Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1156 **  Return Kerberos error code and kssl_err struct on error.
1157 **  Allocates krb5_ticket and krb5_principal; caller should free these.
1158 **
1159 **      20010410        VRS     Implemented krb5_decode_ticket() as
1160 **                              old_krb5_decode_ticket(). Missing from MIT1.0.6.
1161 **      20010615        VRS     Re-cast as openssl/asn1 d2i_*() functions.
1162 **                              Re-used some of the old krb5_decode_ticket()
1163 **                              code here.  This tkt should alloc/free just
1164 **                              like the real thing.
1165 */
1166 krb5_error_code
1167 kssl_TKT2tkt(   /* IN     */    krb5_context    krb5context,
1168                 /* IN     */    KRB5_TKTBODY    *asn1ticket,
1169                 /* OUT    */    krb5_ticket     **krb5ticket,
1170                 /* OUT    */    KSSL_ERR *kssl_err  )
1171         {
1172         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1173         krb5_ticket                     *new5ticket = NULL;
1174         ASN1_GENERALSTRING              *gstr_svc, *gstr_host;
1175
1176         *krb5ticket = NULL;
1177
1178         if (asn1ticket == NULL  ||  asn1ticket->realm == NULL  ||
1179                 asn1ticket->sname == NULL  || 
1180                 asn1ticket->sname->namestring == NULL  ||
1181                 asn1ticket->sname->namestring->num < 2)
1182                 {
1183                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1184                         "Null field in asn1ticket.\n");
1185                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1186                 return KRB5KRB_ERR_GENERIC;
1187                 }
1188
1189         if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
1190                 {
1191                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1192                         "Unable to allocate new krb5_ticket.\n");
1193                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1194                 return ENOMEM;          /*  or  KRB5KRB_ERR_GENERIC;    */
1195                 }
1196
1197         gstr_svc  = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[0];
1198         gstr_host = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[1];
1199
1200         if ((krb5rc = kssl_build_principal_2(krb5context,
1201                         &new5ticket->server,
1202                         asn1ticket->realm->length, asn1ticket->realm->data,
1203                         gstr_svc->length,  gstr_svc->data,
1204                         gstr_host->length, gstr_host->data)) != 0)
1205                 {
1206                 free(new5ticket);
1207                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1208                         "Error building ticket server principal.\n");
1209                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1210                 return krb5rc;          /*  or  KRB5KRB_ERR_GENERIC;    */
1211                 }
1212
1213         krb5_princ_type(krb5context, new5ticket->server) =
1214                         asn1ticket->sname->nametype->data[0];
1215         new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1216         new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1217         new5ticket->enc_part.ciphertext.length =
1218                         asn1ticket->encdata->cipher->length;
1219         if ((new5ticket->enc_part.ciphertext.data =
1220                 calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
1221                 {
1222                 free(new5ticket);
1223                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1224                         "Error allocating cipher in krb5ticket.\n");
1225                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1226                 return KRB5KRB_ERR_GENERIC;
1227                 }
1228         else
1229                 {
1230                 memcpy(new5ticket->enc_part.ciphertext.data,
1231                         asn1ticket->encdata->cipher->data,
1232                         asn1ticket->encdata->cipher->length);
1233                 }
1234
1235         *krb5ticket = new5ticket;
1236         return 0;
1237         }
1238
1239
1240 /*      Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1241 **              and krb5 AP_REQ message & message length,
1242 **      Return Kerberos session key and client principle
1243 **              to SSL Server in KSSL_CTX *kssl_ctx.
1244 **
1245 **      19990702        VRS     Started.
1246 */
1247 krb5_error_code
1248 kssl_sget_tkt(  /* UPDATE */    KSSL_CTX                *kssl_ctx,
1249                 /* IN     */    krb5_data               *indata,
1250                 /* OUT    */    krb5_ticket_times       *ttimes,
1251                 /* OUT    */    KSSL_ERR                *kssl_err  )
1252         {
1253         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1254         static krb5_context             krb5context = NULL;
1255         static krb5_auth_context        krb5auth_context = NULL;
1256         krb5_ticket                     *krb5ticket = NULL;
1257         KRB5_TKTBODY                    *asn1ticket = NULL;
1258         unsigned char                   *p;
1259         krb5_keytab                     krb5keytab = NULL;
1260         krb5_keytab_entry               kt_entry;
1261         krb5_principal                  krb5server;
1262         krb5_rcache                     rcache = NULL;
1263
1264         kssl_err_set(kssl_err, 0, "");
1265
1266         if (!kssl_ctx)
1267                 {
1268                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1269                         "No kssl_ctx defined.\n");
1270                 goto err;
1271                 }
1272
1273 #ifdef KSSL_DEBUG
1274         printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
1275 #endif  /* KSSL_DEBUG */
1276
1277         if (!krb5context  &&  (krb5rc = krb5_init_context(&krb5context)))
1278                 {
1279                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1280                         "krb5_init_context() fails.\n");
1281                 goto err;
1282                 }
1283         if (krb5auth_context  &&
1284                 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
1285                 {
1286                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1287                         "krb5_auth_con_free() fails.\n");
1288                 goto err;
1289                 }
1290         else  krb5auth_context = NULL;
1291         if (!krb5auth_context  &&
1292                 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
1293                 {
1294                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1295                         "krb5_auth_con_init() fails.\n");
1296                 goto err;
1297                 }
1298
1299  
1300         if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1301                 &rcache)))
1302                 {
1303                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1304                         "krb5_auth_con_getrcache() fails.\n");
1305                 goto err;
1306                 }
1307  
1308         if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1309                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1310                 KRB5_NT_SRV_HST, &krb5server)) != 0)
1311                 {
1312                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1313                         "krb5_sname_to_principal() fails.\n");
1314                 goto err;
1315                 }
1316
1317         if (rcache == NULL) 
1318                 {
1319                 if ((krb5rc = krb5_get_server_rcache(krb5context,
1320                         krb5_princ_component(krb5context, krb5server, 0),
1321                         &rcache)))
1322                         {
1323                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1324                                 "krb5_get_server_rcache() fails.\n");
1325                         goto err;
1326                         }
1327                 }
1328
1329         if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
1330                 {
1331                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1332                         "krb5_auth_con_setrcache() fails.\n");
1333                 goto err;
1334                 }
1335
1336
1337         /*      kssl_ctx->keytab_file == NULL ==> use Kerberos default
1338         */
1339         if (kssl_ctx->keytab_file)
1340                 {
1341                 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1342                         &krb5keytab);
1343                 if (krb5rc)
1344                         {
1345                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1346                                 "krb5_kt_resolve() fails.\n");
1347                         goto err;
1348                         }
1349                 }
1350         else
1351                 {
1352                 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1353                 if (krb5rc)
1354                         {
1355                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 
1356                                 "krb5_kt_default() fails.\n");
1357                         goto err;
1358                         }
1359                 }
1360
1361         /*      Actual Kerberos5 krb5_recvauth() has initial conversation here
1362         **      o       check KRB5_SENDAUTH_BADAUTHVERS
1363         **              unless KRB5_RECVAUTH_SKIP_VERSION
1364         **      o       check KRB5_SENDAUTH_BADAPPLVERS
1365         **      o       send "0" msg if all OK
1366         */
1367
1368         /*  20010411 was using AP_REQ instead of true KerberosWrapper
1369         **
1370         **  if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1371         **                      &krb5in_data, krb5server, krb5keytab,
1372         **                      &ap_option, &krb5ticket)) != 0)  { Error }
1373         */
1374
1375         p = indata->data;
1376         if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
1377                                                 (long) indata->length)) == NULL)
1378                 {
1379                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1380                         "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1381                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1382                 goto err;
1383                 }
1384         
1385         /* Was:  krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
1386         if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1387                                         kssl_err)) != 0)
1388                 {
1389                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1390                         "Error converting ASN.1 ticket to krb5_ticket.\n");
1391                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1392                 goto err;
1393                 }
1394
1395         if (! krb5_principal_compare(krb5context, krb5server,
1396                                                   krb5ticket->server))  {
1397                 krb5rc = KRB5_PRINC_NOMATCH;
1398                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1399                         "server principal != ticket principal\n");
1400                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1401                 goto err;
1402                 }
1403         if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1404                         krb5ticket->server, krb5ticket->enc_part.kvno,
1405                         krb5ticket->enc_part.enctype, &kt_entry)) != 0)  {
1406                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1407                         "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1408                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1409                 goto err;
1410                 }
1411         if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1412                         krb5ticket)) != 0)  {
1413                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1414                         "krb5_decrypt_tkt_part() failed.\n");
1415                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1416                 goto err;
1417                 }
1418         else  {
1419                 krb5_kt_free_entry(krb5context, &kt_entry);
1420 #ifdef KSSL_DEBUG
1421                 {
1422                 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1423                 printf("Decrypted ticket fields:\n");
1424                 printf("\tflags: %X, transit-type: %X",
1425                         krb5ticket->enc_part2->flags,
1426                         krb5ticket->enc_part2->transited.tr_type);
1427                 print_krb5_data("\ttransit-data: ",
1428                         &(krb5ticket->enc_part2->transited.tr_contents));
1429                 printf("\tcaddrs: %p, authdata: %p\n",
1430                         krb5ticket->enc_part2->caddrs,
1431                         krb5ticket->enc_part2->authorization_data);
1432                 if (paddr)
1433                         {
1434                         printf("\tcaddrs:\n");
1435                         for (i=0; paddr[i] != NULL; i++)
1436                                 {
1437                                 krb5_data d;
1438                                 d.length=paddr[i]->length;
1439                                 d.data=paddr[i]->contents;
1440                                 print_krb5_data("\t\tIP: ", &d);
1441                                 }
1442                         }
1443                 printf("\tstart/auth/end times: %d / %d / %d\n",
1444                         krb5ticket->enc_part2->times.starttime,
1445                         krb5ticket->enc_part2->times.authtime,
1446                         krb5ticket->enc_part2->times.endtime);
1447                 }
1448 #endif  /* KSSL_DEBUG */
1449                 }
1450
1451         krb5rc = KRB5_NO_TKT_SUPPLIED;
1452         if (!krb5ticket  ||     !krb5ticket->enc_part2  ||
1453                 !krb5ticket->enc_part2->client  ||
1454                 !krb5ticket->enc_part2->client->data  ||
1455                 !krb5ticket->enc_part2->session)
1456                 {
1457                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1458                         "bad ticket from krb5_rd_req.\n");
1459                 }
1460         else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1461                 &krb5ticket->enc_part2->client->realm,
1462                 krb5ticket->enc_part2->client->data))
1463                 {
1464                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1465                         "kssl_ctx_setprinc() fails.\n");
1466                 }
1467         else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
1468                 {
1469                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1470                         "kssl_ctx_setkey() fails.\n");
1471                 }
1472         else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
1473                 {
1474                 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1475                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1476                         "invalid ticket from krb5_rd_req.\n");
1477                 }
1478         else    krb5rc = 0;
1479
1480         kssl_ctx->enctype       = krb5ticket->enc_part.enctype;
1481         ttimes->authtime        = krb5ticket->enc_part2->times.authtime;
1482         ttimes->starttime       = krb5ticket->enc_part2->times.starttime;
1483         ttimes->endtime         = krb5ticket->enc_part2->times.endtime;
1484         ttimes->renew_till      = krb5ticket->enc_part2->times.renew_till;
1485
1486  err:
1487 #ifdef KSSL_DEBUG
1488         kssl_ctx_show(kssl_ctx);
1489 #endif  /* KSSL_DEBUG */
1490
1491         if (asn1ticket)         KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1492         if (krb5keytab)         krb5_kt_close(krb5context, krb5keytab);
1493         if (krb5ticket)         krb5_free_ticket(krb5context, krb5ticket);
1494         if (krb5server)         krb5_free_principal(krb5context, krb5server);
1495         return (krb5rc);
1496         }
1497
1498
1499 /*      Allocate & return a new kssl_ctx struct.
1500 */
1501 KSSL_CTX        *
1502 kssl_ctx_new(void)
1503         {
1504         return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX)));
1505         }
1506
1507
1508 /*      Frees a kssl_ctx struct and any allocated memory it holds.
1509 **      Returns NULL.
1510 */
1511 KSSL_CTX        *
1512 kssl_ctx_free(KSSL_CTX *kssl_ctx)
1513         {
1514         if (kssl_ctx == NULL)  return kssl_ctx;
1515
1516         if (kssl_ctx->key)              memset(kssl_ctx->key, 0,
1517                                                               kssl_ctx->length);
1518         if (kssl_ctx->key)              free(kssl_ctx->key);
1519         if (kssl_ctx->client_princ)     free(kssl_ctx->client_princ);
1520         if (kssl_ctx->service_host)     free(kssl_ctx->service_host);
1521         if (kssl_ctx->service_name)     free(kssl_ctx->service_name);
1522         if (kssl_ctx->keytab_file)      free(kssl_ctx->keytab_file);
1523
1524         free(kssl_ctx);
1525         return (KSSL_CTX *) NULL;
1526         }
1527
1528
1529 /*      Given a (krb5_data *) entity (and optional realm),
1530 **      set the plain (char *) client_princ or service_host member
1531 **      of the kssl_ctx struct.
1532 */
1533 krb5_error_code
1534 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1535         krb5_data *realm, krb5_data *entity)
1536         {
1537         char    **princ;
1538         int     length;
1539
1540         if (kssl_ctx == NULL  ||  entity == NULL)  return KSSL_CTX_ERR;
1541
1542         switch (which)
1543                 {
1544         case KSSL_CLIENT:       princ = &kssl_ctx->client_princ;        break;
1545         case KSSL_SERVER:       princ = &kssl_ctx->service_host;        break;
1546         default:                return KSSL_CTX_ERR;                    break;
1547                 }
1548         if (*princ)  free(*princ);
1549
1550         length = entity->length + ((realm)? realm->length + 2: 1);
1551         if ((*princ = calloc(1, length)) == NULL)
1552                 return KSSL_CTX_ERR;
1553         else
1554                 {
1555                 strncpy(*princ, entity->data, entity->length);
1556                 if (realm)
1557                         {
1558                         strcat (*princ, "@");
1559                         (void) strncat(*princ, realm->data, realm->length);
1560                         }
1561                 }
1562
1563         return KSSL_CTX_OK;
1564         }
1565
1566
1567 /*      Set one of the plain (char *) string members of the kssl_ctx struct.
1568 **      Default values should be:
1569 **              which == KSSL_SERVICE   =>      "khost" (KRB5SVC)
1570 **              which == KSSL_KEYTAB    =>      "/etc/krb5.keytab" (KRB5KEYTAB)
1571 */
1572 krb5_error_code
1573 kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1574         {
1575         char    **string;
1576
1577         if (!kssl_ctx)  return KSSL_CTX_ERR;
1578
1579         switch (which)
1580                 {
1581         case KSSL_SERVICE:      string = &kssl_ctx->service_name;       break;
1582         case KSSL_SERVER:       string = &kssl_ctx->service_host;       break;
1583         case KSSL_CLIENT:       string = &kssl_ctx->client_princ;       break;
1584         case KSSL_KEYTAB:       string = &kssl_ctx->keytab_file;        break;
1585         default:                return KSSL_CTX_ERR;                    break;
1586                 }
1587         if (*string)  free(*string);
1588
1589         if (!text)
1590                 {
1591                 *string = '\0';
1592                 return KSSL_CTX_OK;
1593                 }
1594
1595         if ((*string = calloc(1, strlen(text) + 1)) == NULL)
1596                 return KSSL_CTX_ERR;
1597         else
1598                 strcpy(*string, text);
1599
1600         return KSSL_CTX_OK;
1601         }
1602
1603
1604 /*      Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1605 **      struct.  Clear kssl_ctx->key if Kerberos session key is NULL.
1606 */
1607 krb5_error_code
1608 kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1609         {
1610         int             length;
1611         krb5_enctype    enctype;
1612         krb5_octet FAR  *contents = NULL;
1613
1614         if (!kssl_ctx)  return KSSL_CTX_ERR;
1615
1616         if (kssl_ctx->key)
1617                 {
1618                 memset(kssl_ctx->key, 0, kssl_ctx->length);
1619                 free(kssl_ctx->key);
1620                 }
1621
1622         if (session)
1623                 {
1624
1625 #ifdef KRB5_HEIMDAL
1626                 length = session->keyvalue->length;
1627                 enctype = session->keytype;
1628                 contents = session->keyvalue->contents;
1629 #else
1630                 length = session->length;
1631                 enctype = session->enctype;
1632                 contents = session->contents;
1633 #endif
1634                 kssl_ctx->enctype = enctype;
1635                 kssl_ctx->length  = length;
1636                 }
1637         else
1638                 {
1639                 kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1640                 kssl_ctx->length  = 0;
1641                 return KSSL_CTX_OK;
1642                 }
1643
1644         if ((kssl_ctx->key =
1645                 (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL)
1646                 {
1647                 kssl_ctx->length  = 0;
1648                 return KSSL_CTX_ERR;
1649                 }
1650         else
1651                 memcpy(kssl_ctx->key, contents, length);
1652
1653         return KSSL_CTX_OK;
1654         }
1655
1656
1657 /*      Display contents of kssl_ctx struct
1658 */
1659 void
1660 kssl_ctx_show(KSSL_CTX *kssl_ctx)
1661         {
1662         int     i;
1663
1664         printf("kssl_ctx: ");
1665         if (kssl_ctx == NULL)
1666                 {
1667                 printf("NULL\n");
1668                 return;
1669                 }
1670         else
1671                 printf("%p\n", kssl_ctx);
1672
1673         printf("\tservice:\t%s\n",
1674                 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
1675         printf("\tclient:\t%s\n",
1676                 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
1677         printf("\tserver:\t%s\n",
1678                 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
1679         printf("\tkeytab:\t%s\n",
1680                 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
1681         printf("\tkey [%d:%d]:\t",
1682                 kssl_ctx->enctype, kssl_ctx->length);
1683
1684         for (i=0; i < kssl_ctx->length  &&  kssl_ctx->key; i++)
1685                 {
1686                 printf("%02x", kssl_ctx->key[i]);
1687                 }
1688         printf("\n");
1689         return;
1690         }
1691
1692     int 
1693     kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1694 {
1695     krb5_context                krb5context = NULL;
1696     krb5_keytab                 krb5keytab = NULL;
1697     krb5_keytab_entry           entry;
1698     krb5_principal              princ = NULL;
1699     krb5_error_code             krb5rc = KRB5KRB_ERR_GENERIC;
1700     int rc = 0;
1701
1702     if ((krb5rc = krb5_init_context(&krb5context)))
1703         return(0);
1704
1705     /*  kssl_ctx->keytab_file == NULL ==> use Kerberos default
1706     */
1707     if (kssl_ctx->keytab_file)
1708     {
1709         krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1710                                   &krb5keytab);
1711         if (krb5rc)
1712             goto exit;
1713     }
1714     else
1715     {
1716         krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1717         if (krb5rc)
1718             goto exit;
1719     }
1720
1721     /* the host key we are looking for */
1722     krb5rc = krb5_sname_to_principal(krb5context, NULL, 
1723                                      kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
1724                                      KRB5_NT_SRV_HST, &princ);
1725
1726     krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 
1727                                 princ,
1728                                 0 /* IGNORE_VNO */,
1729                                 0 /* IGNORE_ENCTYPE */,
1730                                 &entry);
1731     if ( krb5rc == KRB5_KT_NOTFOUND ) {
1732         rc = 1;
1733         goto exit;
1734     } else if ( krb5rc )
1735         goto exit;
1736     
1737     krb5_kt_free_entry(krb5context, &entry);
1738     rc = 1;
1739
1740   exit:
1741     if (krb5keytab)     krb5_kt_close(krb5context, krb5keytab);
1742     if (princ)          krb5_free_principal(krb5context, princ);
1743     if (krb5context)    krb5_free_context(krb5context);
1744     return(rc);
1745 }
1746
1747 int 
1748 kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1749         {
1750         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1751         krb5_context            krb5context = NULL;
1752         krb5_ccache             krb5ccdef = NULL;
1753         krb5_creds              krb5creds, *krb5credsp = NULL;
1754         int                     rc = 0;
1755
1756         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1757
1758         if (!kssl_ctx)
1759             return(0);
1760
1761         if (!kssl_ctx->service_host)
1762             return(0);
1763
1764         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1765             goto err;
1766
1767         if ((krb5rc = krb5_sname_to_principal(krb5context,
1768                                               kssl_ctx->service_host,
1769                                               (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1770                                               KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1771             goto err;
1772
1773         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1774             goto err;
1775
1776         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1777                                              &krb5creds.client)) != 0)
1778             goto err;
1779
1780         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1781                                             &krb5creds, &krb5credsp)) != 0)
1782             goto err;
1783
1784         rc = 1;
1785
1786       err:
1787 #ifdef KSSL_DEBUG
1788         kssl_ctx_show(kssl_ctx);
1789 #endif  /* KSSL_DEBUG */
1790
1791         if (krb5creds.client)   krb5_free_principal(krb5context, krb5creds.client);
1792         if (krb5creds.server)   krb5_free_principal(krb5context, krb5creds.server);
1793         if (krb5context)        krb5_free_context(krb5context);
1794         return(rc);
1795         }
1796
1797 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1798 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1799         {
1800 #ifdef KRB5_HEIMDAL
1801         data->length = 0;
1802         if (data->data)
1803             free(data->data);
1804 #elif defined(KRB5_MIT_OLD11)
1805         if (data->data)  {
1806                 krb5_xfree(data->data);
1807                 data->data = 0;
1808                 }
1809 #else
1810         krb5_free_data_contents(NULL, data);
1811 #endif
1812         }
1813 #endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1814
1815 /*  Helper function for kssl_validate_times().
1816 **  We need context->clockskew, but krb5_context is an opaque struct.
1817 **  So we try to sneek the clockskew out through the replay cache.
1818 **      If that fails just return a likely default (300 seconds).
1819 */
1820 krb5_deltat     get_rc_clockskew(krb5_context context)
1821         {
1822         krb5_rcache     rc;
1823         krb5_deltat     clockskew;
1824
1825         if (krb5_rc_default(context, &rc))  return KSSL_CLOCKSKEW;
1826         if (krb5_rc_initialize(context, rc, 0))  return KSSL_CLOCKSKEW;
1827         if (krb5_rc_get_lifespan(context, rc, &clockskew))  {
1828                 clockskew = KSSL_CLOCKSKEW;
1829                 }
1830         (void) krb5_rc_destroy(context, rc);
1831         return clockskew;
1832         }
1833
1834
1835 /*  kssl_validate_times() combines (and more importantly exposes)
1836 **  the MIT KRB5 internal function krb5_validate_times() and the
1837 **  in_clock_skew() macro.  The authenticator client time is checked
1838 **  to be within clockskew secs of the current time and the current
1839 **  time is checked to be within the ticket start and expire times.
1840 **  Either check may be omitted by supplying a NULL value.
1841 **  Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
1842 **  See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
1843 **  20010420 VRS
1844 */
1845 krb5_error_code  kssl_validate_times(   krb5_timestamp atime,
1846                                         krb5_ticket_times *ttimes)
1847         {
1848         krb5_deltat     skew;
1849         krb5_timestamp  start, now;
1850         krb5_error_code rc;
1851         krb5_context    context;
1852
1853         if ((rc = krb5_init_context(&context)))  return SSL_R_KRB5_S_BAD_TICKET;
1854         skew = get_rc_clockskew(context); 
1855         if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
1856         krb5_free_context(context);
1857
1858         if (atime  &&  labs(atime - now) >= skew)  return SSL_R_KRB5_S_TKT_SKEW;
1859
1860         if (! ttimes)  return 0;
1861
1862         start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
1863         if (start - now > skew)  return SSL_R_KRB5_S_TKT_NYV;
1864         if ((now - ttimes->endtime) > skew)  return SSL_R_KRB5_S_TKT_EXPIRED;
1865
1866 #ifdef KSSL_DEBUG
1867         printf("kssl_validate_times: %d |<-  | %d - %d | < %d  ->| %d\n",
1868                 start, atime, now, skew, ttimes->endtime);
1869 #endif  /* KSSL_DEBUG */
1870
1871         return 0;
1872         }
1873
1874
1875 /*  Decode and decrypt given DER-encoded authenticator, then pass
1876 **  authenticator ctime back in *atimep (or 0 if time unavailable).
1877 **  Returns krb5_error_code and kssl_err on error.  A NULL 
1878 **  authenticator (authentp->length == 0) is not considered an error.
1879 **  Note that kssl_check_authent() makes use of the KRB5 session key;
1880 **  you must call kssl_sget_tkt() to get the key before calling this routine.
1881 */
1882 krb5_error_code  kssl_check_authent(
1883                         /* IN     */    KSSL_CTX        *kssl_ctx,
1884                         /* IN     */    krb5_data       *authentp,
1885                         /* OUT    */    krb5_timestamp  *atimep,
1886                         /* OUT    */    KSSL_ERR        *kssl_err  )
1887         {
1888         krb5_error_code         krb5rc = 0;
1889         KRB5_ENCDATA            *dec_authent = NULL;
1890         KRB5_AUTHENTBODY        *auth = NULL;
1891         krb5_enctype            enctype;
1892         EVP_CIPHER_CTX          ciph_ctx;
1893         EVP_CIPHER              *enc = NULL;
1894         unsigned char           iv[EVP_MAX_IV_LENGTH];
1895         unsigned char           *p, *unenc_authent, *tbuf = NULL;
1896         int                     padl, outl, unencbufsize;
1897
1898         *atimep = 0;
1899         kssl_err_set(kssl_err, 0, "");
1900
1901 #ifndef KRB5CHECKAUTH
1902         authentp = NULL;
1903 #else
1904 #if     KRB5CHECKAUTH == 0
1905         authentp = NULL;
1906 #endif
1907 #endif  /* KRB5CHECKAUTH */
1908
1909         if (authentp == NULL  ||  authentp->length == 0)  return 0;
1910
1911 #ifdef KSSL_DEBUG
1912         printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
1913         p = authentp->data; 
1914         for (padl=0; padl < authentp->length; padl++)  printf("%02x ",p[padl]);
1915         printf("\n");
1916 #endif  /* KSSL_DEBUG */
1917
1918         unencbufsize = 2 * authentp->length;
1919         if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
1920                 {
1921                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1922                         "Unable to allocate authenticator buffer.\n");
1923                 krb5rc = KRB5KRB_ERR_GENERIC;
1924                 goto err;
1925                 }
1926
1927         p = authentp->data;
1928         if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
1929                                         (long) authentp->length)) == NULL) 
1930                 {
1931                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1932                         "Error decoding authenticator.\n");
1933                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1934                 goto err;
1935                 }
1936
1937         enctype = dec_authent->etype->data[0];  /* should = kssl_ctx->enctype */
1938         enc = kssl_map_enc(enctype);
1939         memset(iv, 0, EVP_MAX_IV_LENGTH);       /* per RFC 1510 */
1940
1941         EVP_DecryptInit(&ciph_ctx, enc, kssl_ctx->key, iv);
1942         EVP_DecryptUpdate(&ciph_ctx, unenc_authent, &outl,
1943                         dec_authent->cipher->data, dec_authent->cipher->length);
1944         if (outl > unencbufsize)
1945                 {
1946                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1947                         "Buffer overflow decrypting authenticator.\n");
1948                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1949                 goto err;
1950                 }
1951         EVP_DecryptFinal(&ciph_ctx, &(unenc_authent[outl]), &padl);
1952         outl += padl;
1953         if (outl > unencbufsize)
1954                 {
1955                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1956                         "Buffer overflow decrypting authenticator.\n");
1957                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1958                 goto err;
1959                 }
1960         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1961
1962 #ifdef KSSL_DEBUG
1963         printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
1964         for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
1965         printf("\n");
1966 #endif  /* KSSL_DEBUG */
1967
1968         if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
1969                 {
1970                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1971                         "confounded by authenticator.\n");
1972                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1973                 goto err;
1974                 }
1975         outl -= p - unenc_authent;
1976
1977         if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
1978                                                           (long) outl))==NULL)
1979                 {
1980                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1981                         "Error decoding authenticator body.\n");
1982                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1983                 goto err;
1984                 }
1985         if ((tbuf = calloc(1, auth->ctime->length + 1)) == NULL)
1986                 {
1987                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1988                         "Unable to allocate atime buffer.\n");
1989                 krb5rc = KRB5KRB_ERR_GENERIC;
1990                 goto err;
1991                 }
1992         else    strncpy(tbuf, auth->ctime->data, auth->ctime->length);
1993         
1994         if ( auth->ctime->length >= 9 && auth->ctime->length <= 14  )  
1995                 /* tbuf == "%Y%m%d%H%M%S" */
1996                 {
1997                 struct tm               tm_time, *tm_l, *tm_g;
1998                 time_t                  now, tl, tg, tr, tz_offset;
1999                 int                     i;
2000                 char                    *p = tbuf;
2001  
2002                 memset(&tm_time,0,sizeof(struct tm));
2003                 for ( i=0; 
2004                       i<4 && isdigit(*p);
2005                       i++, p++ )
2006                         tm_time.tm_year = tm_time.tm_year*10 + (*p-'0');
2007                 for ( i=0; 
2008                       i<2 && isdigit(*p) && tm_time.tm_mon <= 1; 
2009                       i++, p++ )
2010                         tm_time.tm_mon = tm_time.tm_mon*10 + (*p-'0');
2011                 for ( i=0; 
2012                       i<2 && isdigit(*p) && tm_time.tm_mday <= 3;
2013                       i++, p++ )
2014                         tm_time.tm_mday = tm_time.tm_mday*10 + (*p-'0');
2015                 for ( i=0; 
2016                       i<2 && isdigit(*p) && tm_time.tm_hour <= 2;
2017                       i++, p++ )
2018                         tm_time.tm_hour = tm_time.tm_hour*10 + (*p-'0');
2019                 for ( i=0;
2020                       i<2 && isdigit(*p) && tm_time.tm_min <= 6;
2021                       i++, p++ )
2022                         tm_time.tm_min = tm_time.tm_min*10 + (*p-'0');
2023                 for ( i=0; 
2024                       i<2 && isdigit(*p) && tm_time.tm_sec <= 6;
2025                       i++, p++ )
2026                         tm_time.tm_sec = tm_time.tm_sec*10 + (*p-'0');
2027
2028                 now  = time(&now);
2029                 tm_l = localtime(&now);         tl = mktime(tm_l);
2030                 tm_g = gmtime(&now);            tg = mktime(tm_g);
2031                 tz_offset = tg - tl;
2032                 tr = mktime(&tm_time);
2033
2034                 if (tr != (time_t)(-1))
2035                         *atimep = mktime(&tm_time) - tz_offset;
2036                 }
2037 #ifdef KSSL_DEBUG
2038         printf("kssl_check_authent: client time %s = %d\n", tbuf, *atimep);
2039 #endif  /* KSSL_DEBUG */
2040
2041  err:
2042         if (tbuf)               free(tbuf);
2043         if (auth)               KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2044         if (dec_authent)        KRB5_ENCDATA_free(dec_authent);
2045         if (unenc_authent)      free(unenc_authent);
2046         return krb5rc;
2047         }
2048
2049
2050 /*  Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2051 **  because I dont't know how to stub varargs.
2052 **  Returns krb5_error_code == ENOMEM on alloc error, otherwise
2053 **  passes back newly constructed principal, which should be freed by caller.
2054 */
2055 krb5_error_code  kssl_build_principal_2(
2056                         /* UPDATE */    krb5_context    context,
2057                         /* OUT    */    krb5_principal  *princ,
2058                         /* IN     */    int rlen,  const char *realm,
2059                         /* IN     */    int slen,  const char *svc,
2060                         /* IN     */    int hlen,  const char *host)
2061         {
2062         krb5_data               *p_data = NULL;
2063         krb5_principal          new_p = NULL;
2064         char                    *new_r = NULL;
2065
2066         if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL  ||
2067             (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
2068                         == NULL)  goto err;
2069         new_p->length = 2;
2070         new_p->data = p_data;
2071
2072         if ((new_r = calloc(1, rlen + 1)) == NULL)  goto err;
2073         memcpy(new_r, realm, rlen);
2074         krb5_princ_set_realm_length(context, new_p, rlen);
2075         krb5_princ_set_realm_data(context, new_p, new_r);
2076
2077         if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL)  goto err;
2078         memcpy(new_p->data[0].data, svc, slen);
2079         new_p->data[0].length = slen;
2080
2081         if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL)  goto err;
2082         memcpy(new_p->data[1].data, host, hlen);
2083         new_p->data[1].length = hlen;
2084         
2085         krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2086         *princ = new_p;
2087         return 0;
2088
2089  err:
2090         if (new_p  &&  new_p[0].data)   free(new_p[0].data);
2091         if (new_p  &&  new_p[1].data)   free(new_p[1].data);
2092         if (new_p)      free(new_p);
2093         if (new_r)      free(new_r);
2094         return ENOMEM;
2095         }
2096
2097
2098 #else /* !OPENSSL_NO_KRB5 */
2099
2100 #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2101 static int dummy=(int)&dummy;
2102 #endif
2103
2104 #endif  /* !OPENSSL_NO_KRB5     */
2105