73401c92a3e9be7a449c0e4be682100b6d6ea7aa
[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
71 #include <string.h>
72
73 #define KRB5_PRIVATE    1
74
75 #include <openssl/ssl.h>
76 #include <openssl/evp.h>
77 #include <openssl/objects.h>
78 #include <openssl/krb5_asn.h>
79
80 #ifndef OPENSSL_NO_KRB5
81
82 #ifndef ENOMEM
83 #define ENOMEM KRB5KRB_ERR_GENERIC
84 #endif
85
86 /* 
87  * When OpenSSL is built on Windows, we do not want to require that
88  * the Kerberos DLLs be available in order for the OpenSSL DLLs to
89  * work.  Therefore, all Kerberos routines are loaded at run time
90  * and we do not link to a .LIB file.
91  */
92
93 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
94 /* 
95  * The purpose of the following pre-processor statements is to provide
96  * compatibility with different releases of MIT Kerberos for Windows.
97  * All versions up to 1.2 used macros.  But macros do not allow for
98  * a binary compatible interface for DLLs.  Therefore, all macros are
99  * being replaced by function calls.  The following code will allow
100  * an OpenSSL DLL built on Windows to work whether or not the macro
101  * or function form of the routines are utilized.
102  */
103 #ifdef  krb5_cc_get_principal
104 #define NO_DEF_KRB5_CCACHE
105 #undef  krb5_cc_get_principal
106 #endif
107 #define krb5_cc_get_principal    kssl_krb5_cc_get_principal
108
109 #define krb5_free_data_contents  kssl_krb5_free_data_contents   
110 #define krb5_free_context        kssl_krb5_free_context         
111 #define krb5_auth_con_free       kssl_krb5_auth_con_free        
112 #define krb5_free_principal      kssl_krb5_free_principal       
113 #define krb5_mk_req_extended     kssl_krb5_mk_req_extended      
114 #define krb5_get_credentials     kssl_krb5_get_credentials      
115 #define krb5_cc_default          kssl_krb5_cc_default           
116 #define krb5_sname_to_principal  kssl_krb5_sname_to_principal   
117 #define krb5_init_context        kssl_krb5_init_context         
118 #define krb5_free_ticket         kssl_krb5_free_ticket          
119 #define krb5_rd_req              kssl_krb5_rd_req               
120 #define krb5_kt_default          kssl_krb5_kt_default           
121 #define krb5_kt_resolve          kssl_krb5_kt_resolve           
122 /* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */
123 #ifndef krb5_kt_close
124 #define krb5_kt_close            kssl_krb5_kt_close
125 #endif /* krb5_kt_close */
126 #ifndef krb5_kt_get_entry
127 #define krb5_kt_get_entry        kssl_krb5_kt_get_entry
128 #endif /* krb5_kt_get_entry */
129 #define krb5_auth_con_init       kssl_krb5_auth_con_init        
130
131 #define krb5_principal_compare   kssl_krb5_principal_compare
132 #define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
133 #define krb5_timeofday           kssl_krb5_timeofday
134 #define krb5_rc_default           kssl_krb5_rc_default
135
136 #ifdef krb5_rc_initialize
137 #undef krb5_rc_initialize
138 #endif
139 #define krb5_rc_initialize   kssl_krb5_rc_initialize
140
141 #ifdef krb5_rc_get_lifespan
142 #undef krb5_rc_get_lifespan
143 #endif
144 #define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
145
146 #ifdef krb5_rc_destroy
147 #undef krb5_rc_destroy
148 #endif
149 #define krb5_rc_destroy      kssl_krb5_rc_destroy
150
151 #define valid_cksumtype      kssl_valid_cksumtype
152 #define krb5_checksum_size   kssl_krb5_checksum_size
153 #define krb5_kt_free_entry   kssl_krb5_kt_free_entry
154 #define krb5_auth_con_setrcache  kssl_krb5_auth_con_setrcache
155 #define krb5_auth_con_getrcache  kssl_krb5_auth_con_getrcache
156 #define krb5_get_server_rcache   kssl_krb5_get_server_rcache
157
158 /* Prototypes for built in stubs */
159 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
160 void kssl_krb5_free_principal(krb5_context, krb5_principal );
161 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
162                                      krb5_const char *,
163                                      krb5_keytab *);
164 krb5_error_code kssl_krb5_kt_default(krb5_context,
165                                      krb5_keytab *);
166 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
167 krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *, 
168                                  krb5_const krb5_data *,
169                                  krb5_const_principal, krb5_keytab, 
170                                  krb5_flags *,krb5_ticket **);
171
172 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
173                                          krb5_const_principal);
174 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
175                                           krb5_auth_context  *,
176                                           krb5_const krb5_flags,
177                                           krb5_data  *,
178                                           krb5_creds  *,
179                                           krb5_data  * );
180 krb5_error_code kssl_krb5_init_context(krb5_context *);
181 void kssl_krb5_free_context(krb5_context);
182 krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache  *);
183 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
184                                              krb5_const char  *,
185                                              krb5_const char  *,
186                                              krb5_int32,
187                                              krb5_principal  *);
188 krb5_error_code kssl_krb5_get_credentials(krb5_context,
189                                           krb5_const krb5_flags,
190                                           krb5_ccache,
191                                           krb5_creds  *,
192                                           krb5_creds  *  *);
193 krb5_error_code kssl_krb5_auth_con_init(krb5_context,
194                                         krb5_auth_context  *);
195 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context, 
196                                            krb5_ccache cache,
197                                            krb5_principal *principal);
198 krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
199 size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
200 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
201 krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
202 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context, 
203                                              krb5_auth_context, 
204                                              krb5_rcache);
205 krb5_error_code kssl_krb5_get_server_rcache(krb5_context, 
206                                             krb5_const krb5_data *,
207                                             krb5_rcache *);
208 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context, 
209                                              krb5_auth_context,
210                                              krb5_rcache *);
211
212 /* Function pointers (almost all Kerberos functions are _stdcall) */
213 static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
214         =NULL;
215 static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
216         =NULL;
217 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
218                         (krb5_context, krb5_const char *, krb5_keytab *)=NULL;
219 static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
220                                                      krb5_keytab *)=NULL;
221 static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context, 
222                                                       krb5_ticket *)=NULL;
223 static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context, 
224                                                  krb5_auth_context *, 
225                                                  krb5_const krb5_data *,
226                                                  krb5_const_principal, 
227                                                  krb5_keytab, krb5_flags *,
228                                                  krb5_ticket **)=NULL;
229 static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
230                         (krb5_context, krb5_auth_context *,
231                          krb5_const krb5_flags, krb5_data *, krb5_creds *,
232                          krb5_data * )=NULL;
233 static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
234 static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
235 static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
236                                                      krb5_ccache  *)=NULL;
237 static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
238                         (krb5_context, krb5_const char *, krb5_const char *,
239                          krb5_int32, krb5_principal *)=NULL;
240 static krb5_error_code (_stdcall *p_krb5_get_credentials)
241                         (krb5_context, krb5_const krb5_flags, krb5_ccache,
242                          krb5_creds *, krb5_creds **)=NULL;
243 static krb5_error_code (_stdcall *p_krb5_auth_con_init)
244                         (krb5_context, krb5_auth_context *)=NULL;
245 static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
246                         (krb5_context context, krb5_ccache cache,
247                          krb5_principal *principal)=NULL;
248 static krb5_error_code (_stdcall *p_krb5_auth_con_free)
249                         (krb5_context, krb5_auth_context)=NULL;
250 static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
251                         (krb5_context, krb5_const krb5_keyblock *,
252                                            krb5_ticket *)=NULL;
253 static krb5_error_code (_stdcall *p_krb5_timeofday)
254                         (krb5_context context, krb5_int32 *timeret)=NULL;
255 static krb5_error_code (_stdcall *p_krb5_rc_default)
256                         (krb5_context context, krb5_rcache *rc)=NULL;
257 static krb5_error_code (_stdcall *p_krb5_rc_initialize)
258                         (krb5_context context, krb5_rcache rc,
259                                      krb5_deltat lifespan)=NULL;
260 static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
261                         (krb5_context context, krb5_rcache rc,
262                                        krb5_deltat *lifespan)=NULL;
263 static krb5_error_code (_stdcall *p_krb5_rc_destroy)
264                         (krb5_context context, krb5_rcache rc)=NULL;
265 static krb5_boolean (_stdcall *p_krb5_principal_compare)
266                      (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
267 static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
268 static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
269 static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
270                         (krb5_context,krb5_keytab_entry * )=NULL;
271 static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context, 
272                                                                krb5_auth_context, 
273                                                                krb5_rcache)=NULL;
274 static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context, 
275                                                               krb5_const krb5_data *, 
276                                                               krb5_rcache *)=NULL;
277 static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context, 
278                                                       krb5_auth_context,
279                                                       krb5_rcache *)=NULL;
280 static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context, 
281                                                     krb5_keytab keytab)=NULL;
282 static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context, 
283                                                         krb5_keytab keytab,
284                        krb5_const_principal principal, krb5_kvno vno,
285                        krb5_enctype enctype, krb5_keytab_entry *entry)=NULL;
286 static int krb5_loaded = 0;     /* only attempt to initialize func ptrs once */
287
288 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
289 void
290 load_krb5_dll(void)
291         {
292         HANDLE hKRB5_32;
293     
294         krb5_loaded++;
295         hKRB5_32 = LoadLibrary(TEXT("KRB5_32"));
296         if (!hKRB5_32)
297                 return;
298
299         (FARPROC) p_krb5_free_data_contents =
300                 GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
301         (FARPROC) p_krb5_free_context =
302                 GetProcAddress( hKRB5_32, "krb5_free_context" );
303         (FARPROC) p_krb5_auth_con_free =
304                 GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
305         (FARPROC) p_krb5_free_principal =
306                 GetProcAddress( hKRB5_32, "krb5_free_principal" );
307         (FARPROC) p_krb5_mk_req_extended =
308                 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
309         (FARPROC) p_krb5_get_credentials =
310                 GetProcAddress( hKRB5_32, "krb5_get_credentials" );
311         (FARPROC) p_krb5_cc_get_principal =
312                 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
313         (FARPROC) p_krb5_cc_default =
314                 GetProcAddress( hKRB5_32, "krb5_cc_default" );
315         (FARPROC) p_krb5_sname_to_principal =
316                 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
317         (FARPROC) p_krb5_init_context =
318                 GetProcAddress( hKRB5_32, "krb5_init_context" );
319         (FARPROC) p_krb5_free_ticket =
320                 GetProcAddress( hKRB5_32, "krb5_free_ticket" );
321         (FARPROC) p_krb5_rd_req =
322                 GetProcAddress( hKRB5_32, "krb5_rd_req" );
323         (FARPROC) p_krb5_principal_compare =
324                 GetProcAddress( hKRB5_32, "krb5_principal_compare" );
325         (FARPROC) p_krb5_decrypt_tkt_part =
326                 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
327         (FARPROC) p_krb5_timeofday =
328                 GetProcAddress( hKRB5_32, "krb5_timeofday" );
329         (FARPROC) p_krb5_rc_default =
330                 GetProcAddress( hKRB5_32, "krb5_rc_default" );
331         (FARPROC) p_krb5_rc_initialize =
332                 GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
333         (FARPROC) p_krb5_rc_get_lifespan =
334                 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
335         (FARPROC) p_krb5_rc_destroy =
336                 GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
337         (FARPROC) p_krb5_kt_default =
338                 GetProcAddress( hKRB5_32, "krb5_kt_default" );
339         (FARPROC) p_krb5_kt_resolve =
340                 GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
341         (FARPROC) p_krb5_auth_con_init =
342                 GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
343         (FARPROC) p_valid_cksumtype =
344                 GetProcAddress( hKRB5_32, "valid_cksumtype" );
345         (FARPROC) p_krb5_checksum_size =
346                 GetProcAddress( hKRB5_32, "krb5_checksum_size" );
347         (FARPROC) p_krb5_kt_free_entry =
348                 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
349         (FARPROC) p_krb5_auth_con_setrcache =
350                 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
351         (FARPROC) p_krb5_get_server_rcache =
352                 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
353         (FARPROC) p_krb5_auth_con_getrcache =
354                 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
355         (FARPROC) p_krb5_kt_close =
356                 GetProcAddress( hKRB5_32, "krb5_kt_close" );
357         (FARPROC) p_krb5_kt_get_entry =
358                 GetProcAddress( hKRB5_32, "krb5_kt_get_entry" );
359         }
360
361 /* Stubs for each function to be dynamicly loaded */
362 void
363 kssl_krb5_free_data_contents(krb5_context CO, krb5_data  * data)
364         {
365         if (!krb5_loaded)
366                 load_krb5_dll();
367
368         if ( p_krb5_free_data_contents )
369                 p_krb5_free_data_contents(CO,data);
370         }
371
372 krb5_error_code
373 kssl_krb5_mk_req_extended (krb5_context CO,
374                           krb5_auth_context  * pACO,
375                           krb5_const krb5_flags F,
376                           krb5_data  * pD1,
377                           krb5_creds  * pC,
378                           krb5_data  * pD2)
379         {
380         if (!krb5_loaded)
381                 load_krb5_dll();
382
383         if ( p_krb5_mk_req_extended )
384                 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
385         else
386                 return KRB5KRB_ERR_GENERIC;
387         }
388 krb5_error_code
389 kssl_krb5_auth_con_init(krb5_context CO,
390                        krb5_auth_context  * pACO)
391         {
392         if (!krb5_loaded)
393                 load_krb5_dll();
394
395         if ( p_krb5_auth_con_init )
396                 return(p_krb5_auth_con_init(CO,pACO));
397         else
398                 return KRB5KRB_ERR_GENERIC;
399         }
400 krb5_error_code
401 kssl_krb5_auth_con_free (krb5_context CO,
402                         krb5_auth_context ACO)
403         {
404         if (!krb5_loaded)
405                 load_krb5_dll();
406
407         if ( p_krb5_auth_con_free )
408                 return(p_krb5_auth_con_free(CO,ACO));
409         else
410                 return KRB5KRB_ERR_GENERIC;
411         }
412 krb5_error_code
413 kssl_krb5_get_credentials(krb5_context CO,
414                          krb5_const krb5_flags F,
415                          krb5_ccache CC,
416                          krb5_creds  * pCR,
417                          krb5_creds  ** ppCR)
418         {
419         if (!krb5_loaded)
420                 load_krb5_dll();
421
422         if ( p_krb5_get_credentials )
423                 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
424         else
425                 return KRB5KRB_ERR_GENERIC;
426         }
427 krb5_error_code
428 kssl_krb5_sname_to_principal(krb5_context CO,
429                             krb5_const char  * pC1,
430                             krb5_const char  * pC2,
431                             krb5_int32 I,
432                             krb5_principal  * pPR)
433         {
434         if (!krb5_loaded)
435                 load_krb5_dll();
436
437         if ( p_krb5_sname_to_principal )
438                 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
439         else
440                 return KRB5KRB_ERR_GENERIC;
441         }
442
443 krb5_error_code
444 kssl_krb5_cc_default(krb5_context CO,
445                     krb5_ccache  * pCC)
446         {
447         if (!krb5_loaded)
448                 load_krb5_dll();
449
450         if ( p_krb5_cc_default )
451                 return(p_krb5_cc_default(CO,pCC));
452         else
453                 return KRB5KRB_ERR_GENERIC;
454         }
455
456 krb5_error_code
457 kssl_krb5_init_context(krb5_context * pCO)
458         {
459         if (!krb5_loaded)
460                 load_krb5_dll();
461
462         if ( p_krb5_init_context )
463                 return(p_krb5_init_context(pCO));
464         else
465                 return KRB5KRB_ERR_GENERIC;
466         }
467
468 void
469 kssl_krb5_free_context(krb5_context CO)
470         {
471         if (!krb5_loaded)
472                 load_krb5_dll();
473
474         if ( p_krb5_free_context )
475                 p_krb5_free_context(CO);
476         }
477
478 void
479 kssl_krb5_free_principal(krb5_context c, krb5_principal p)
480         {
481         if (!krb5_loaded)
482                 load_krb5_dll();
483
484         if ( p_krb5_free_principal )
485                 p_krb5_free_principal(c,p);
486         }
487
488 krb5_error_code
489 kssl_krb5_kt_resolve(krb5_context con,
490                     krb5_const char * sz,
491                     krb5_keytab * kt)
492         {
493         if (!krb5_loaded)
494                 load_krb5_dll();
495
496         if ( p_krb5_kt_resolve )
497                 return(p_krb5_kt_resolve(con,sz,kt));
498         else
499                 return KRB5KRB_ERR_GENERIC;
500         }
501
502 krb5_error_code
503 kssl_krb5_kt_default(krb5_context con,
504                     krb5_keytab * kt)
505         {
506         if (!krb5_loaded)
507                 load_krb5_dll();
508
509         if ( p_krb5_kt_default )
510                 return(p_krb5_kt_default(con,kt));
511         else
512                 return KRB5KRB_ERR_GENERIC;
513         }
514
515 krb5_error_code
516 kssl_krb5_free_ticket(krb5_context con,
517                      krb5_ticket * kt)
518         {
519         if (!krb5_loaded)
520                 load_krb5_dll();
521
522         if ( p_krb5_free_ticket )
523                 return(p_krb5_free_ticket(con,kt));
524         else
525                 return KRB5KRB_ERR_GENERIC;
526         }
527
528 krb5_error_code
529 kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
530                 krb5_const krb5_data * data,
531                 krb5_const_principal princ, krb5_keytab keytab,
532                 krb5_flags * flags, krb5_ticket ** pptkt)
533         {
534         if (!krb5_loaded)
535                 load_krb5_dll();
536
537         if ( p_krb5_rd_req )
538                 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
539         else
540                 return KRB5KRB_ERR_GENERIC;
541         }
542
543 krb5_boolean
544 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
545                 krb5_const_principal princ2)
546         {
547         if (!krb5_loaded)
548                 load_krb5_dll();
549
550         if ( p_krb5_principal_compare )
551                 return(p_krb5_principal_compare(con,princ1,princ2));
552         else
553                 return KRB5KRB_ERR_GENERIC;
554         }
555
556 krb5_error_code
557 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
558                 krb5_ticket *ticket)
559         {
560         if (!krb5_loaded)
561                 load_krb5_dll();
562
563         if ( p_krb5_decrypt_tkt_part )
564                 return(p_krb5_decrypt_tkt_part(con,keys,ticket));
565         else
566                 return KRB5KRB_ERR_GENERIC;
567         }
568
569 krb5_error_code
570 krb5_timeofday(krb5_context con, krb5_int32 *timeret)
571         {
572         if (!krb5_loaded)
573                 load_krb5_dll();
574
575         if ( p_krb5_timeofday )
576                 return(p_krb5_timeofday(con,timeret));
577         else
578                 return KRB5KRB_ERR_GENERIC;
579         }
580
581 krb5_error_code
582 krb5_rc_default(krb5_context con, krb5_rcache *rc)
583         {
584         if (!krb5_loaded)
585                 load_krb5_dll();
586
587         if ( p_krb5_rc_default )
588                 return(p_krb5_rc_default(con,rc));
589         else
590                 return KRB5KRB_ERR_GENERIC;
591         }
592
593 krb5_error_code
594 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
595         {
596         if (!krb5_loaded)
597                 load_krb5_dll();
598
599         if ( p_krb5_rc_initialize )
600                 return(p_krb5_rc_initialize(con, rc, lifespan));
601         else
602                 return KRB5KRB_ERR_GENERIC;
603         }
604
605 krb5_error_code
606 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
607         {
608         if (!krb5_loaded)
609                 load_krb5_dll();
610
611         if ( p_krb5_rc_get_lifespan )
612                 return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
613         else
614                 return KRB5KRB_ERR_GENERIC;
615         }
616
617 krb5_error_code
618 krb5_rc_destroy(krb5_context con, krb5_rcache rc)
619         {
620         if (!krb5_loaded)
621                 load_krb5_dll();
622
623         if ( p_krb5_rc_destroy )
624                 return(p_krb5_rc_destroy(con, rc));
625         else
626                 return KRB5KRB_ERR_GENERIC;
627         }
628
629 size_t 
630 krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
631         {
632         if (!krb5_loaded)
633                 load_krb5_dll();
634
635         if ( p_krb5_checksum_size )
636                 return(p_krb5_checksum_size(context, ctype));
637         else
638                 return KRB5KRB_ERR_GENERIC;
639         }
640
641 krb5_boolean 
642 valid_cksumtype(krb5_cksumtype ctype)
643         {
644         if (!krb5_loaded)
645                 load_krb5_dll();
646
647         if ( p_valid_cksumtype )
648                 return(p_valid_cksumtype(ctype));
649         else
650                 return KRB5KRB_ERR_GENERIC;
651         }
652
653 krb5_error_code 
654 krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
655         {
656         if (!krb5_loaded)
657                 load_krb5_dll();
658
659         if ( p_krb5_kt_free_entry )
660                 return(p_krb5_kt_free_entry(con,entry));
661         else
662                 return KRB5KRB_ERR_GENERIC;
663         }
664                  
665 /* Structure definitions  */
666 #ifndef NO_DEF_KRB5_CCACHE
667 #ifndef krb5_x
668 #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
669 #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
670 #endif 
671
672 typedef krb5_pointer    krb5_cc_cursor; /* cursor for sequential lookup */
673
674 typedef struct _krb5_ccache
675         {
676         krb5_magic magic;
677         struct _krb5_cc_ops FAR *ops;
678         krb5_pointer data;
679         } *krb5_ccache;
680
681 typedef struct _krb5_cc_ops
682         {
683         krb5_magic magic;
684         char  *prefix;
685         char  * (KRB5_CALLCONV *get_name)
686                 (krb5_context, krb5_ccache);
687         krb5_error_code (KRB5_CALLCONV *resolve)
688                 (krb5_context, krb5_ccache  *, const char  *);
689         krb5_error_code (KRB5_CALLCONV *gen_new)
690                 (krb5_context, krb5_ccache  *);
691         krb5_error_code (KRB5_CALLCONV *init)
692                 (krb5_context, krb5_ccache, krb5_principal);
693         krb5_error_code (KRB5_CALLCONV *destroy)
694                 (krb5_context, krb5_ccache);
695         krb5_error_code (KRB5_CALLCONV *close)
696                 (krb5_context, krb5_ccache);
697         krb5_error_code (KRB5_CALLCONV *store)
698                 (krb5_context, krb5_ccache, krb5_creds  *);
699         krb5_error_code (KRB5_CALLCONV *retrieve)
700                 (krb5_context, krb5_ccache,
701                 krb5_flags, krb5_creds  *, krb5_creds  *);
702         krb5_error_code (KRB5_CALLCONV *get_princ)
703                 (krb5_context, krb5_ccache, krb5_principal  *);
704         krb5_error_code (KRB5_CALLCONV *get_first)
705                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
706         krb5_error_code (KRB5_CALLCONV *get_next)
707                 (krb5_context, krb5_ccache,
708                 krb5_cc_cursor  *, krb5_creds  *);
709         krb5_error_code (KRB5_CALLCONV *end_get)
710                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
711         krb5_error_code (KRB5_CALLCONV *remove_cred)
712                 (krb5_context, krb5_ccache,
713                 krb5_flags, krb5_creds  *);
714         krb5_error_code (KRB5_CALLCONV *set_flags)
715                 (krb5_context, krb5_ccache, krb5_flags);
716         } krb5_cc_ops;
717 #endif /* NO_DEF_KRB5_CCACHE */
718
719 krb5_error_code 
720 kssl_krb5_cc_get_principal
721     (krb5_context context, krb5_ccache cache,
722       krb5_principal *principal)
723         {
724         if ( p_krb5_cc_get_principal )
725                 return(p_krb5_cc_get_principal(context,cache,principal));
726         else
727                 return(krb5_x
728                         ((cache)->ops->get_princ,(context, cache, principal)));
729         }
730
731 krb5_error_code
732 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
733                              krb5_rcache rcache)
734         {
735         if ( p_krb5_auth_con_setrcache )
736                  return(p_krb5_auth_con_setrcache(con,acon,rcache));
737         else
738                  return KRB5KRB_ERR_GENERIC;
739         }
740
741 krb5_error_code
742 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
743                             krb5_rcache * rcache) 
744         {
745         if ( p_krb5_get_server_rcache )
746                 return(p_krb5_get_server_rcache(con,data,rcache));
747         else
748                 return KRB5KRB_ERR_GENERIC;
749         }
750
751 krb5_error_code
752 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
753                              krb5_rcache * prcache)
754         {
755         if ( p_krb5_auth_con_getrcache )
756                 return(p_krb5_auth_con_getrcache(con,acon, prcache));
757         else
758                 return KRB5KRB_ERR_GENERIC;
759         }
760  
761 krb5_error_code
762 kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab)
763         {
764         if ( p_krb5_kt_close )
765                 return(p_krb5_kt_close(context,keytab));
766         else 
767                 return KRB5KRB_ERR_GENERIC;
768         }
769
770 krb5_error_code
771 kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
772                        krb5_const_principal principal, krb5_kvno vno,
773                        krb5_enctype enctype, krb5_keytab_entry *entry)
774         {
775         if ( p_krb5_kt_get_entry )
776                 return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry));
777         else
778                 return KRB5KRB_ERR_GENERIC;
779         }
780 #endif  /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
781
782
783 /* memory allocation functions for non-temporary storage
784  * (e.g. stuff that gets saved into the kssl context) */
785 static void* kssl_calloc(size_t nmemb, size_t size)
786 {
787         void* p;
788         
789         p=OPENSSL_malloc(nmemb*size);
790         if (p){
791                 memset(p, 0, nmemb*size);
792         }
793         return p;
794 }
795
796 #define kssl_malloc(size) OPENSSL_malloc((size))
797 #define kssl_realloc(ptr, size) OPENSSL_realloc(ptr, size)
798 #define kssl_free(ptr) OPENSSL_free((ptr))
799
800
801 char
802 *kstring(char *string)
803         {
804         static char     *null = "[NULL]";
805
806         return ((string == NULL)? null: string);
807         }
808
809 /*      Given KRB5 enctype (basically DES or 3DES),
810 **      return closest match openssl EVP_ encryption algorithm.
811 **      Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes.
812 **      Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK.
813 */
814 const EVP_CIPHER *
815 kssl_map_enc(krb5_enctype enctype)
816         {
817         switch (enctype)
818                 {
819         case ENCTYPE_DES_HMAC_SHA1:             /*    EVP_des_cbc();       */
820         case ENCTYPE_DES_CBC_CRC:
821         case ENCTYPE_DES_CBC_MD4:
822         case ENCTYPE_DES_CBC_MD5:
823         case ENCTYPE_DES_CBC_RAW:
824                                 return EVP_des_cbc();
825                                 break;
826         case ENCTYPE_DES3_CBC_SHA1:             /*    EVP_des_ede3_cbc();  */
827         case ENCTYPE_DES3_CBC_SHA:
828         case ENCTYPE_DES3_CBC_RAW:
829                                 return EVP_des_ede3_cbc();
830                                 break;
831         default:                return NULL;
832                                 break;
833                 }
834         }
835
836
837 /*      Return true:1 if p "looks like" the start of the real authenticator
838 **      described in kssl_skip_confound() below.  The ASN.1 pattern is
839 **      "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
840 **      xx and yy are possibly multi-byte length fields.
841 */
842 int     kssl_test_confound(unsigned char *p)
843         {
844         int     len = 2;
845         int     xx = 0, yy = 0;
846
847         if (*p++ != 0x62)  return 0;
848         if (*p > 0x82)  return 0;
849         switch(*p)  {
850                 case 0x82:  p++;          xx = (*p++ << 8);  xx += *p++;  break;
851                 case 0x81:  p++;          xx =  *p++;  break;
852                 case 0x80:  return 0;
853                 default:    xx = *p++;  break;
854                 }
855         if (*p++ != 0x30)  return 0;
856         if (*p > 0x82)  return 0;
857         switch(*p)  {
858                 case 0x82:  p++; len+=2;  yy = (*p++ << 8);  yy += *p++;  break;
859                 case 0x81:  p++; len++;   yy =  *p++;  break;
860                 case 0x80:  return 0;
861                 default:    yy = *p++;  break;
862                 }
863
864         return (xx - len == yy)? 1: 0;
865         }
866
867 /*      Allocate, fill, and return cksumlens array of checksum lengths.
868 **      This array holds just the unique elements from the krb5_cksumarray[].
869 **      array[n] == 0 signals end of data.
870 **
871 **      The krb5_cksumarray[] was an internal variable that has since been
872 **      replaced by a more general method for storing the data.  It should
873 **      not be used.  Instead we use real API calls and make a guess for 
874 **      what the highest assigned CKSUMTYPE_ constant is.  As of 1.2.2
875 **      it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3).  So we will use 0x0010.
876 */
877 size_t  *populate_cksumlens(void)
878         {
879         int             i, j, n;
880         static size_t   *cklens = NULL;
881
882 #ifdef KRB5_MIT_OLD11
883         n = krb5_max_cksum;
884 #else
885         n = 0x0010;
886 #endif  /* KRB5_MIT_OLD11 */
887  
888 #ifdef KRB5CHECKAUTH
889         if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1)))  return NULL;
890
891         for (i=0; i < n; i++)  {
892                 if (!valid_cksumtype(i))  continue;     /*  array has holes  */
893                 for (j=0; j < n; j++)  {
894                         if (cklens[j] == 0)  {
895                                 cklens[j] = krb5_checksum_size(NULL,i);
896                                 break;          /*  krb5 elem was new: add   */
897                                 }
898                         if (cklens[j] == krb5_checksum_size(NULL,i))  {
899                                 break;          /*  ignore duplicate elements */
900                                 }
901                         }
902                 }
903 #endif  /* KRB5CHECKAUTH */
904
905         return cklens;
906         }
907
908 /*      Return pointer to start of real authenticator within authenticator, or
909 **      return NULL on error.
910 **      Decrypted authenticator looks like this:
911 **              [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
912 **      This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
913 **      krb5_auth_con_getcksumtype() function advertised in its krb5.h.
914 */
915 unsigned char   *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
916         {
917         int             i, conlen;
918         size_t          cklen;
919         static size_t   *cksumlens = NULL;
920         unsigned char   *test_auth;
921
922         conlen = (etype)? 8: 0;
923
924         if (!cksumlens  &&  !(cksumlens = populate_cksumlens()))  return NULL;
925         for (i=0; (cklen = cksumlens[i]) != 0; i++)
926                 {
927                 test_auth = a + conlen + cklen;
928                 if (kssl_test_confound(test_auth))  return test_auth;
929                 }
930
931         return NULL;
932         }
933
934
935 /*      Set kssl_err error info when reason text is a simple string
936 **              kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
937 */
938 void
939 kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
940         {
941         if (kssl_err == NULL)  return;
942
943         kssl_err->reason = reason;
944         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "%s", text);
945         return;
946         }
947
948
949 /*      Display contents of krb5_data struct, for debugging
950 */
951 void
952 print_krb5_data(char *label, krb5_data *kdata)
953         {
954         int i;
955
956         printf("%s[%d] ", label, kdata->length);
957         for (i=0; i < (int)kdata->length; i++)
958                 {
959                 if (0 &&  isprint((int) kdata->data[i]))
960                         printf( "%c ",  kdata->data[i]);
961                 else
962                         printf( "%02x ", (unsigned char) kdata->data[i]);
963                 }
964         printf("\n");
965         }
966
967
968 /*      Display contents of krb5_authdata struct, for debugging
969 */
970 void
971 print_krb5_authdata(char *label, krb5_authdata **adata)
972         {
973         if (adata == NULL)
974                 {
975                 printf("%s, authdata==0\n", label);
976                 return;
977                 }
978         printf("%s [%p]\n", label, (void *)adata);
979 #if 0
980         {
981         int     i;
982         printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
983         for (i=0; i < adata->length; i++)
984                 {
985                 printf((isprint(adata->contents[i]))? "%c ": "%02x",
986                         adata->contents[i]);
987                 }
988         printf("\n");
989         }
990 #endif
991         }
992
993
994 /*      Display contents of krb5_keyblock struct, for debugging
995 */
996 void
997 print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
998         {
999         int i;
1000
1001         if (keyblk == NULL)
1002                 {
1003                 printf("%s, keyblk==0\n", label);
1004                 return;
1005                 }
1006 #ifdef KRB5_HEIMDAL
1007         printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
1008                                            keyblk->keyvalue->length);
1009         for (i=0; i < (int)keyblk->keyvalue->length; i++)
1010                 {
1011                 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
1012                 }
1013         printf("\n");
1014 #else
1015         printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
1016         for (i=0; i < (int)keyblk->length; i++)
1017                 {
1018                 printf("%02x",keyblk->contents[i]);
1019                 }
1020         printf("\n");
1021 #endif
1022         }
1023
1024
1025 /*      Display contents of krb5_principal_data struct, for debugging
1026 **      (krb5_principal is typedef'd == krb5_principal_data *)
1027 */
1028 void
1029 print_krb5_princ(char *label, krb5_principal_data *princ)
1030         {
1031         int i, ui, uj;
1032
1033         printf("%s principal Realm: ", label);
1034         if (princ == NULL)  return;
1035         for (ui=0; ui < (int)princ->realm.length; ui++)  putchar(princ->realm.data[ui]);
1036         printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
1037         for (i=0; i < (int)princ->length; i++)
1038                 {
1039                 printf("\t%d [%d]: ", i, princ->data[i].length);
1040                 for (uj=0; uj < (int)princ->data[i].length; uj++)  {
1041                         putchar(princ->data[i].data[uj]);
1042                         }
1043                 printf("\n");
1044                 }
1045         return;
1046         }
1047
1048
1049 /*      Given krb5 service (typically "kssl") and hostname in kssl_ctx,
1050 **      Return encrypted Kerberos ticket for service @ hostname.
1051 **      If authenp is non-NULL, also return encrypted authenticator,
1052 **      whose data should be freed by caller.
1053 **      (Originally was: Create Kerberos AP_REQ message for SSL Client.)
1054 **
1055 **      19990628        VRS     Started; Returns Kerberos AP_REQ message.
1056 **      20010409        VRS     Modified for RFC2712; Returns enc tkt.
1057 **      20010606        VRS     May also return optional authenticator.
1058 */
1059 krb5_error_code
1060 kssl_cget_tkt(  /* UPDATE */    KSSL_CTX *kssl_ctx,
1061                 /* OUT    */    krb5_data **enc_ticketp,
1062                 /* UPDATE */    krb5_data *authenp,
1063                 /* OUT    */    KSSL_ERR *kssl_err)
1064         {
1065         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1066         krb5_context            krb5context = NULL;
1067         krb5_auth_context       krb5auth_context = NULL;
1068         krb5_ccache             krb5ccdef = NULL;
1069         krb5_creds              krb5creds, *krb5credsp = NULL;
1070         krb5_data               krb5_app_req;
1071
1072         kssl_err_set(kssl_err, 0, "");
1073         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1074
1075         if (!kssl_ctx)
1076                 {
1077                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1078                         "No kssl_ctx defined.\n");
1079                 goto err;
1080                 }
1081         else if (!kssl_ctx->service_host)
1082                 {
1083                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1084                         "kssl_ctx service_host undefined.\n");
1085                 goto err;
1086                 }
1087
1088         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1089                 {
1090                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1091                         "krb5_init_context() fails: %d\n", krb5rc);
1092                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1093                 goto err;
1094                 }
1095
1096         if ((krb5rc = krb5_sname_to_principal(krb5context,
1097                 kssl_ctx->service_host,
1098                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1099                 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1100                 {
1101                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1102                         "krb5_sname_to_principal() fails for %s/%s\n",
1103                         kssl_ctx->service_host,
1104                         (kssl_ctx->service_name)? kssl_ctx->service_name:
1105                                                   KRB5SVC);
1106                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1107                 goto err;
1108                 }
1109
1110         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1111                 {
1112                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1113                         "krb5_cc_default fails.\n");
1114                 goto err;
1115                 }
1116
1117         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1118                 &krb5creds.client)) != 0)
1119                 {
1120                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1121                         "krb5_cc_get_principal() fails.\n");
1122                 goto err;
1123                 }
1124
1125         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1126                 &krb5creds, &krb5credsp)) != 0)
1127                 {
1128                 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1129                         "krb5_get_credentials() fails.\n");
1130                 goto err;
1131                 }
1132
1133         *enc_ticketp = &krb5credsp->ticket;
1134 #ifdef KRB5_HEIMDAL
1135         kssl_ctx->enctype = krb5credsp->session.keytype;
1136 #else
1137         kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1138 #endif
1139
1140         krb5rc = KRB5KRB_ERR_GENERIC;
1141         /*      caller should free data of krb5_app_req  */
1142         /*  20010406 VRS deleted for real KerberosWrapper
1143         **  20010605 VRS reinstated to offer Authenticator to KerberosWrapper
1144         */
1145         krb5_app_req.length = 0;
1146         if (authenp)
1147                 {
1148                 krb5_data       krb5in_data;
1149                 const unsigned char     *p;
1150                 long            arlen;
1151                 KRB5_APREQBODY  *ap_req;
1152
1153                 authenp->length = 0;
1154                 krb5in_data.data = NULL;
1155                 krb5in_data.length = 0;
1156                 if ((krb5rc = krb5_mk_req_extended(krb5context,
1157                         &krb5auth_context, 0, &krb5in_data, krb5credsp,
1158                         &krb5_app_req)) != 0)
1159                         {
1160                         kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1161                                 "krb5_mk_req_extended() fails.\n");
1162                         goto err;
1163                         }
1164
1165                 arlen = krb5_app_req.length;
1166                 p = (unsigned char *)krb5_app_req.data;
1167                 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
1168                 if (ap_req)
1169                         {
1170                         authenp->length = i2d_KRB5_ENCDATA(
1171                                         ap_req->authenticator, NULL);
1172                         if (authenp->length  && 
1173                                 (authenp->data = malloc(authenp->length)))
1174                                 {
1175                                 unsigned char   *adp = (unsigned char *)authenp->data;
1176                                 authenp->length = i2d_KRB5_ENCDATA(
1177                                                 ap_req->authenticator, &adp);
1178                                 }
1179                         }
1180
1181                 if (ap_req)  KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1182                 if (krb5_app_req.length)  
1183                         kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1184                 }
1185 #ifdef KRB5_HEIMDAL
1186         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1187                 {
1188                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1189                         "kssl_ctx_setkey() fails.\n");
1190                 }
1191 #else
1192         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1193                 {
1194                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1195                         "kssl_ctx_setkey() fails.\n");
1196                 }
1197 #endif
1198         else    krb5rc = 0;
1199
1200  err:
1201 #ifdef KSSL_DEBUG
1202         kssl_ctx_show(kssl_ctx);
1203 #endif  /* KSSL_DEBUG */
1204
1205         if (krb5creds.client)   krb5_free_principal(krb5context,
1206                                                         krb5creds.client);
1207         if (krb5creds.server)   krb5_free_principal(krb5context,
1208                                                         krb5creds.server);
1209         if (krb5auth_context)   krb5_auth_con_free(krb5context,
1210                                                         krb5auth_context);
1211         if (krb5context)        krb5_free_context(krb5context);
1212         return (krb5rc);
1213         }
1214
1215
1216 /*  Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1217 **  Return Kerberos error code and kssl_err struct on error.
1218 **  Allocates krb5_ticket and krb5_principal; caller should free these.
1219 **
1220 **      20010410        VRS     Implemented krb5_decode_ticket() as
1221 **                              old_krb5_decode_ticket(). Missing from MIT1.0.6.
1222 **      20010615        VRS     Re-cast as openssl/asn1 d2i_*() functions.
1223 **                              Re-used some of the old krb5_decode_ticket()
1224 **                              code here.  This tkt should alloc/free just
1225 **                              like the real thing.
1226 */
1227 krb5_error_code
1228 kssl_TKT2tkt(   /* IN     */    krb5_context    krb5context,
1229                 /* IN     */    KRB5_TKTBODY    *asn1ticket,
1230                 /* OUT    */    krb5_ticket     **krb5ticket,
1231                 /* OUT    */    KSSL_ERR *kssl_err  )
1232         {
1233         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1234         krb5_ticket                     *new5ticket = NULL;
1235         ASN1_GENERALSTRING              *gstr_svc, *gstr_host;
1236
1237         *krb5ticket = NULL;
1238
1239         if (asn1ticket == NULL  ||  asn1ticket->realm == NULL  ||
1240                 asn1ticket->sname == NULL  || 
1241                 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2)
1242                 {
1243                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1244                         "Null field in asn1ticket.\n");
1245                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1246                 return KRB5KRB_ERR_GENERIC;
1247                 }
1248
1249         if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
1250                 {
1251                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1252                         "Unable to allocate new krb5_ticket.\n");
1253                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1254                 return ENOMEM;          /*  or  KRB5KRB_ERR_GENERIC;    */
1255                 }
1256
1257         gstr_svc  = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0);
1258         gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1);
1259
1260         if ((krb5rc = kssl_build_principal_2(krb5context,
1261                         &new5ticket->server,
1262                         asn1ticket->realm->length, (char *)asn1ticket->realm->data,
1263                         gstr_svc->length,  (char *)gstr_svc->data,
1264                         gstr_host->length, (char *)gstr_host->data)) != 0)
1265                 {
1266                 free(new5ticket);
1267                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1268                         "Error building ticket server principal.\n");
1269                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1270                 return krb5rc;          /*  or  KRB5KRB_ERR_GENERIC;    */
1271                 }
1272
1273         krb5_princ_type(krb5context, new5ticket->server) =
1274                         asn1ticket->sname->nametype->data[0];
1275         new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1276         new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1277         new5ticket->enc_part.ciphertext.length =
1278                         asn1ticket->encdata->cipher->length;
1279         if ((new5ticket->enc_part.ciphertext.data =
1280                 calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
1281                 {
1282                 free(new5ticket);
1283                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1284                         "Error allocating cipher in krb5ticket.\n");
1285                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1286                 return KRB5KRB_ERR_GENERIC;
1287                 }
1288         else
1289                 {
1290                 memcpy(new5ticket->enc_part.ciphertext.data,
1291                         asn1ticket->encdata->cipher->data,
1292                         asn1ticket->encdata->cipher->length);
1293                 }
1294
1295         *krb5ticket = new5ticket;
1296         return 0;
1297         }
1298
1299
1300 /*      Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1301 **              and krb5 AP_REQ message & message length,
1302 **      Return Kerberos session key and client principle
1303 **              to SSL Server in KSSL_CTX *kssl_ctx.
1304 **
1305 **      19990702        VRS     Started.
1306 */
1307 krb5_error_code
1308 kssl_sget_tkt(  /* UPDATE */    KSSL_CTX                *kssl_ctx,
1309                 /* IN     */    krb5_data               *indata,
1310                 /* OUT    */    krb5_ticket_times       *ttimes,
1311                 /* OUT    */    KSSL_ERR                *kssl_err  )
1312         {
1313         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1314         static krb5_context             krb5context = NULL;
1315         static krb5_auth_context        krb5auth_context = NULL;
1316         krb5_ticket                     *krb5ticket = NULL;
1317         KRB5_TKTBODY                    *asn1ticket = NULL;
1318         const unsigned char             *p;
1319         krb5_keytab                     krb5keytab = NULL;
1320         krb5_keytab_entry               kt_entry;
1321         krb5_principal                  krb5server;
1322         krb5_rcache                     rcache = NULL;
1323
1324         kssl_err_set(kssl_err, 0, "");
1325
1326         if (!kssl_ctx)
1327                 {
1328                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1329                         "No kssl_ctx defined.\n");
1330                 goto err;
1331                 }
1332
1333 #ifdef KSSL_DEBUG
1334         printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
1335 #endif  /* KSSL_DEBUG */
1336
1337         if (!krb5context  &&  (krb5rc = krb5_init_context(&krb5context)))
1338                 {
1339                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1340                         "krb5_init_context() fails.\n");
1341                 goto err;
1342                 }
1343         if (krb5auth_context  &&
1344                 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
1345                 {
1346                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1347                         "krb5_auth_con_free() fails.\n");
1348                 goto err;
1349                 }
1350         else  krb5auth_context = NULL;
1351         if (!krb5auth_context  &&
1352                 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
1353                 {
1354                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1355                         "krb5_auth_con_init() fails.\n");
1356                 goto err;
1357                 }
1358
1359  
1360         if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1361                 &rcache)))
1362                 {
1363                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1364                         "krb5_auth_con_getrcache() fails.\n");
1365                 goto err;
1366                 }
1367  
1368         if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1369                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1370                 KRB5_NT_SRV_HST, &krb5server)) != 0)
1371                 {
1372                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1373                         "krb5_sname_to_principal() fails.\n");
1374                 goto err;
1375                 }
1376
1377         if (rcache == NULL) 
1378                 {
1379                 if ((krb5rc = krb5_get_server_rcache(krb5context,
1380                         krb5_princ_component(krb5context, krb5server, 0),
1381                         &rcache)))
1382                         {
1383                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1384                                 "krb5_get_server_rcache() fails.\n");
1385                         goto err;
1386                         }
1387                 }
1388
1389         if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
1390                 {
1391                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1392                         "krb5_auth_con_setrcache() fails.\n");
1393                 goto err;
1394                 }
1395
1396
1397         /*      kssl_ctx->keytab_file == NULL ==> use Kerberos default
1398         */
1399         if (kssl_ctx->keytab_file)
1400                 {
1401                 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1402                         &krb5keytab);
1403                 if (krb5rc)
1404                         {
1405                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1406                                 "krb5_kt_resolve() fails.\n");
1407                         goto err;
1408                         }
1409                 }
1410         else
1411                 {
1412                 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1413                 if (krb5rc)
1414                         {
1415                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, 
1416                                 "krb5_kt_default() fails.\n");
1417                         goto err;
1418                         }
1419                 }
1420
1421         /*      Actual Kerberos5 krb5_recvauth() has initial conversation here
1422         **      o       check KRB5_SENDAUTH_BADAUTHVERS
1423         **              unless KRB5_RECVAUTH_SKIP_VERSION
1424         **      o       check KRB5_SENDAUTH_BADAPPLVERS
1425         **      o       send "0" msg if all OK
1426         */
1427
1428         /*  20010411 was using AP_REQ instead of true KerberosWrapper
1429         **
1430         **  if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1431         **                      &krb5in_data, krb5server, krb5keytab,
1432         **                      &ap_option, &krb5ticket)) != 0)  { Error }
1433         */
1434
1435         p = (unsigned char *)indata->data;
1436         if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
1437                                                 (long) indata->length)) == NULL)
1438                 {
1439                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1440                         "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1441                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1442                 goto err;
1443                 }
1444         
1445         /* Was:  krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
1446         if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1447                                         kssl_err)) != 0)
1448                 {
1449                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1450                         "Error converting ASN.1 ticket to krb5_ticket.\n");
1451                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1452                 goto err;
1453                 }
1454
1455         if (! krb5_principal_compare(krb5context, krb5server,
1456                                                   krb5ticket->server))  {
1457                 krb5rc = KRB5_PRINC_NOMATCH;
1458                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1459                         "server principal != ticket principal\n");
1460                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1461                 goto err;
1462                 }
1463         if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1464                         krb5ticket->server, krb5ticket->enc_part.kvno,
1465                         krb5ticket->enc_part.enctype, &kt_entry)) != 0)  {
1466                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1467                         "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1468                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1469                 goto err;
1470                 }
1471         if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1472                         krb5ticket)) != 0)  {
1473                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1474                         "krb5_decrypt_tkt_part() failed.\n");
1475                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1476                 goto err;
1477                 }
1478         else  {
1479                 krb5_kt_free_entry(krb5context, &kt_entry);
1480 #ifdef KSSL_DEBUG
1481                 {
1482                 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1483                 printf("Decrypted ticket fields:\n");
1484                 printf("\tflags: %X, transit-type: %X",
1485                         krb5ticket->enc_part2->flags,
1486                         krb5ticket->enc_part2->transited.tr_type);
1487                 print_krb5_data("\ttransit-data: ",
1488                         &(krb5ticket->enc_part2->transited.tr_contents));
1489                 printf("\tcaddrs: %p, authdata: %p\n",
1490                         krb5ticket->enc_part2->caddrs,
1491                         krb5ticket->enc_part2->authorization_data);
1492                 if (paddr)
1493                         {
1494                         printf("\tcaddrs:\n");
1495                         for (i=0; paddr[i] != NULL; i++)
1496                                 {
1497                                 krb5_data d;
1498                                 d.length=paddr[i]->length;
1499                                 d.data=paddr[i]->contents;
1500                                 print_krb5_data("\t\tIP: ", &d);
1501                                 }
1502                         }
1503                 printf("\tstart/auth/end times: %d / %d / %d\n",
1504                         krb5ticket->enc_part2->times.starttime,
1505                         krb5ticket->enc_part2->times.authtime,
1506                         krb5ticket->enc_part2->times.endtime);
1507                 }
1508 #endif  /* KSSL_DEBUG */
1509                 }
1510
1511         krb5rc = KRB5_NO_TKT_SUPPLIED;
1512         if (!krb5ticket  ||     !krb5ticket->enc_part2  ||
1513                 !krb5ticket->enc_part2->client  ||
1514                 !krb5ticket->enc_part2->client->data  ||
1515                 !krb5ticket->enc_part2->session)
1516                 {
1517                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1518                         "bad ticket from krb5_rd_req.\n");
1519                 }
1520         else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1521                  &krb5ticket->enc_part2->client->realm,
1522                  krb5ticket->enc_part2->client->data,
1523                  krb5ticket->enc_part2->client->length))
1524                 {
1525                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1526                         "kssl_ctx_setprinc() fails.\n");
1527                 }
1528         else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
1529                 {
1530                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1531                         "kssl_ctx_setkey() fails.\n");
1532                 }
1533         else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
1534                 {
1535                 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1536                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1537                         "invalid ticket from krb5_rd_req.\n");
1538                 }
1539         else    krb5rc = 0;
1540
1541         kssl_ctx->enctype       = krb5ticket->enc_part.enctype;
1542         ttimes->authtime        = krb5ticket->enc_part2->times.authtime;
1543         ttimes->starttime       = krb5ticket->enc_part2->times.starttime;
1544         ttimes->endtime         = krb5ticket->enc_part2->times.endtime;
1545         ttimes->renew_till      = krb5ticket->enc_part2->times.renew_till;
1546
1547  err:
1548 #ifdef KSSL_DEBUG
1549         kssl_ctx_show(kssl_ctx);
1550 #endif  /* KSSL_DEBUG */
1551
1552         if (asn1ticket)         KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1553         if (krb5keytab)         krb5_kt_close(krb5context, krb5keytab);
1554         if (krb5ticket)         krb5_free_ticket(krb5context, krb5ticket);
1555         if (krb5server)         krb5_free_principal(krb5context, krb5server);
1556         return (krb5rc);
1557         }
1558
1559
1560 /*      Allocate & return a new kssl_ctx struct.
1561 */
1562 KSSL_CTX        *
1563 kssl_ctx_new(void)
1564         {
1565         return ((KSSL_CTX *) kssl_calloc(1, sizeof(KSSL_CTX)));
1566         }
1567
1568
1569 /*      Frees a kssl_ctx struct and any allocated memory it holds.
1570 **      Returns NULL.
1571 */
1572 KSSL_CTX        *
1573 kssl_ctx_free(KSSL_CTX *kssl_ctx)
1574         {
1575         if (kssl_ctx == NULL)  return kssl_ctx;
1576
1577         if (kssl_ctx->key)              OPENSSL_cleanse(kssl_ctx->key,
1578                                                               kssl_ctx->length);
1579         if (kssl_ctx->key)              kssl_free(kssl_ctx->key);
1580         if (kssl_ctx->client_princ)     kssl_free(kssl_ctx->client_princ);
1581         if (kssl_ctx->service_host)     kssl_free(kssl_ctx->service_host);
1582         if (kssl_ctx->service_name)     kssl_free(kssl_ctx->service_name);
1583         if (kssl_ctx->keytab_file)      kssl_free(kssl_ctx->keytab_file);
1584
1585         kssl_free(kssl_ctx);
1586         return (KSSL_CTX *) NULL;
1587         }
1588
1589
1590 /*      Given an array of (krb5_data *) entity (and optional realm),
1591 **      set the plain (char *) client_princ or service_host member
1592 **      of the kssl_ctx struct.
1593 */
1594 krb5_error_code
1595 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1596         krb5_data *realm, krb5_data *entity, int nentities)
1597         {
1598         char    **princ;
1599         int     length;
1600         int i;
1601
1602         if (kssl_ctx == NULL  ||  entity == NULL)  return KSSL_CTX_ERR;
1603
1604         switch (which)
1605                 {
1606         case KSSL_CLIENT:       princ = &kssl_ctx->client_princ;        break;
1607         case KSSL_SERVER:       princ = &kssl_ctx->service_host;        break;
1608         default:                return KSSL_CTX_ERR;                    break;
1609                 }
1610         if (*princ)  kssl_free(*princ);
1611
1612         /* Add up all the entity->lengths */
1613         length = 0;
1614         for (i=0; i < nentities; i++)
1615                 {
1616                 length += entity[i].length;
1617                 }
1618         /* Add in space for the '/' character(s) (if any) */
1619         length += nentities-1;
1620         /* Space for the ('@'+realm+NULL | NULL) */
1621         length += ((realm)? realm->length + 2: 1);
1622
1623         if ((*princ = kssl_calloc(1, length)) == NULL)
1624                 return KSSL_CTX_ERR;
1625         else
1626                 {
1627                 for (i = 0; i < nentities; i++)
1628                         {
1629                         strncat(*princ, entity[i].data, entity[i].length);
1630                         if (i < nentities-1)
1631                                 {
1632                                 strcat (*princ, "/");
1633                                 }
1634                         }
1635                 if (realm)
1636                         {
1637                         strcat (*princ, "@");
1638                         (void) strncat(*princ, realm->data, realm->length);
1639                         }
1640                 }
1641
1642         return KSSL_CTX_OK;
1643         }
1644
1645
1646 /*      Set one of the plain (char *) string members of the kssl_ctx struct.
1647 **      Default values should be:
1648 **              which == KSSL_SERVICE   =>      "khost" (KRB5SVC)
1649 **              which == KSSL_KEYTAB    =>      "/etc/krb5.keytab" (KRB5KEYTAB)
1650 */
1651 krb5_error_code
1652 kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1653         {
1654         char    **string;
1655
1656         if (!kssl_ctx)  return KSSL_CTX_ERR;
1657
1658         switch (which)
1659                 {
1660         case KSSL_SERVICE:      string = &kssl_ctx->service_name;       break;
1661         case KSSL_SERVER:       string = &kssl_ctx->service_host;       break;
1662         case KSSL_CLIENT:       string = &kssl_ctx->client_princ;       break;
1663         case KSSL_KEYTAB:       string = &kssl_ctx->keytab_file;        break;
1664         default:                return KSSL_CTX_ERR;                    break;
1665                 }
1666         if (*string)  kssl_free(*string);
1667
1668         if (!text)
1669                 {
1670                 *string = '\0';
1671                 return KSSL_CTX_OK;
1672                 }
1673
1674         if ((*string = kssl_calloc(1, strlen(text) + 1)) == NULL)
1675                 return KSSL_CTX_ERR;
1676         else
1677                 strcpy(*string, text);
1678
1679         return KSSL_CTX_OK;
1680         }
1681
1682
1683 /*      Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1684 **      struct.  Clear kssl_ctx->key if Kerberos session key is NULL.
1685 */
1686 krb5_error_code
1687 kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1688         {
1689         int             length;
1690         krb5_enctype    enctype;
1691         krb5_octet FAR  *contents = NULL;
1692
1693         if (!kssl_ctx)  return KSSL_CTX_ERR;
1694
1695         if (kssl_ctx->key)
1696                 {
1697                 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
1698                 kssl_free(kssl_ctx->key);
1699                 }
1700
1701         if (session)
1702                 {
1703
1704 #ifdef KRB5_HEIMDAL
1705                 length = session->keyvalue->length;
1706                 enctype = session->keytype;
1707                 contents = session->keyvalue->contents;
1708 #else
1709                 length = session->length;
1710                 enctype = session->enctype;
1711                 contents = session->contents;
1712 #endif
1713                 kssl_ctx->enctype = enctype;
1714                 kssl_ctx->length  = length;
1715                 }
1716         else
1717                 {
1718                 kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1719                 kssl_ctx->length  = 0;
1720                 return KSSL_CTX_OK;
1721                 }
1722
1723         if ((kssl_ctx->key =
1724                 (krb5_octet FAR *) kssl_calloc(1, kssl_ctx->length)) == NULL)
1725                 {
1726                 kssl_ctx->length  = 0;
1727                 return KSSL_CTX_ERR;
1728                 }
1729         else
1730                 memcpy(kssl_ctx->key, contents, length);
1731
1732         return KSSL_CTX_OK;
1733         }
1734
1735
1736 /*      Display contents of kssl_ctx struct
1737 */
1738 void
1739 kssl_ctx_show(KSSL_CTX *kssl_ctx)
1740         {
1741         int     i;
1742
1743         printf("kssl_ctx: ");
1744         if (kssl_ctx == NULL)
1745                 {
1746                 printf("NULL\n");
1747                 return;
1748                 }
1749         else
1750                 printf("%p\n", (void *)kssl_ctx);
1751
1752         printf("\tservice:\t%s\n",
1753                 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
1754         printf("\tclient:\t%s\n",
1755                 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
1756         printf("\tserver:\t%s\n",
1757                 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
1758         printf("\tkeytab:\t%s\n",
1759                 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
1760         printf("\tkey [%d:%d]:\t",
1761                 kssl_ctx->enctype, kssl_ctx->length);
1762
1763         for (i=0; i < kssl_ctx->length  &&  kssl_ctx->key; i++)
1764                 {
1765                 printf("%02x", kssl_ctx->key[i]);
1766                 }
1767         printf("\n");
1768         return;
1769         }
1770
1771     int 
1772     kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1773 {
1774     krb5_context                krb5context = NULL;
1775     krb5_keytab                 krb5keytab = NULL;
1776     krb5_keytab_entry           entry;
1777     krb5_principal              princ = NULL;
1778     krb5_error_code             krb5rc = KRB5KRB_ERR_GENERIC;
1779     int rc = 0;
1780
1781     if ((krb5rc = krb5_init_context(&krb5context)))
1782         return(0);
1783
1784     /*  kssl_ctx->keytab_file == NULL ==> use Kerberos default
1785     */
1786     if (kssl_ctx->keytab_file)
1787     {
1788         krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1789                                   &krb5keytab);
1790         if (krb5rc)
1791             goto exit;
1792     }
1793     else
1794     {
1795         krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1796         if (krb5rc)
1797             goto exit;
1798     }
1799
1800     /* the host key we are looking for */
1801     krb5rc = krb5_sname_to_principal(krb5context, NULL, 
1802                                      kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
1803                                      KRB5_NT_SRV_HST, &princ);
1804
1805     krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, 
1806                                 princ,
1807                                 0 /* IGNORE_VNO */,
1808                                 0 /* IGNORE_ENCTYPE */,
1809                                 &entry);
1810     if ( krb5rc == KRB5_KT_NOTFOUND ) {
1811         rc = 1;
1812         goto exit;
1813     } else if ( krb5rc )
1814         goto exit;
1815     
1816     krb5_kt_free_entry(krb5context, &entry);
1817     rc = 1;
1818
1819   exit:
1820     if (krb5keytab)     krb5_kt_close(krb5context, krb5keytab);
1821     if (princ)          krb5_free_principal(krb5context, princ);
1822     if (krb5context)    krb5_free_context(krb5context);
1823     return(rc);
1824 }
1825
1826 int 
1827 kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1828         {
1829         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1830         krb5_context            krb5context = NULL;
1831         krb5_ccache             krb5ccdef = NULL;
1832         krb5_creds              krb5creds, *krb5credsp = NULL;
1833         int                     rc = 0;
1834
1835         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1836
1837         if (!kssl_ctx)
1838             return(0);
1839
1840         if (!kssl_ctx->service_host)
1841             return(0);
1842
1843         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1844             goto err;
1845
1846         if ((krb5rc = krb5_sname_to_principal(krb5context,
1847                                               kssl_ctx->service_host,
1848                                               (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1849                                               KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1850             goto err;
1851
1852         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1853             goto err;
1854
1855         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1856                                              &krb5creds.client)) != 0)
1857             goto err;
1858
1859         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1860                                             &krb5creds, &krb5credsp)) != 0)
1861             goto err;
1862
1863         rc = 1;
1864
1865       err:
1866 #ifdef KSSL_DEBUG
1867         kssl_ctx_show(kssl_ctx);
1868 #endif  /* KSSL_DEBUG */
1869
1870         if (krb5creds.client)   krb5_free_principal(krb5context, krb5creds.client);
1871         if (krb5creds.server)   krb5_free_principal(krb5context, krb5creds.server);
1872         if (krb5context)        krb5_free_context(krb5context);
1873         return(rc);
1874         }
1875
1876 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1877 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1878         {
1879 #ifdef KRB5_HEIMDAL
1880         data->length = 0;
1881         if (data->data)
1882             free(data->data);
1883 #elif defined(KRB5_MIT_OLD11)
1884         if (data->data)  {
1885                 krb5_xfree(data->data);
1886                 data->data = 0;
1887                 }
1888 #else
1889         krb5_free_data_contents(NULL, data);
1890 #endif
1891         }
1892 #endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1893
1894
1895 /*  Given pointers to KerberosTime and struct tm structs, convert the
1896 **  KerberosTime string to struct tm.  Note that KerberosTime is a
1897 **  ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional
1898 **  seconds as defined in RFC 1510.
1899 **  Return pointer to the (partially) filled in struct tm on success,
1900 **  return NULL on failure.
1901 */
1902 struct tm       *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
1903         {
1904         char            c, *p;
1905
1906         if (!k_tm)  return NULL;
1907         if (gtime == NULL  ||  gtime->length < 14)  return NULL;
1908         if (gtime->data == NULL)  return NULL;
1909
1910         p = (char *)&gtime->data[14];
1911
1912         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_sec  = atoi(p);      *(p+2) = c;
1913         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_min  = atoi(p);      *(p+2) = c;
1914         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_hour = atoi(p);      *(p+2) = c;
1915         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mday = atoi(p);      *(p+2) = c;
1916         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mon  = atoi(p)-1;    *(p+2) = c;
1917         c = *p;  *p = '\0';  p -= 4;  k_tm->tm_year = atoi(p)-1900; *(p+4) = c;
1918
1919         return k_tm;
1920         }
1921
1922
1923 /*  Helper function for kssl_validate_times().
1924 **  We need context->clockskew, but krb5_context is an opaque struct.
1925 **  So we try to sneek the clockskew out through the replay cache.
1926 **      If that fails just return a likely default (300 seconds).
1927 */
1928 krb5_deltat     get_rc_clockskew(krb5_context context)
1929         {
1930         krb5_rcache     rc;
1931         krb5_deltat     clockskew;
1932
1933         if (krb5_rc_default(context, &rc))  return KSSL_CLOCKSKEW;
1934         if (krb5_rc_initialize(context, rc, 0))  return KSSL_CLOCKSKEW;
1935         if (krb5_rc_get_lifespan(context, rc, &clockskew))  {
1936                 clockskew = KSSL_CLOCKSKEW;
1937                 }
1938         (void) krb5_rc_destroy(context, rc);
1939         return clockskew;
1940         }
1941
1942
1943 /*  kssl_validate_times() combines (and more importantly exposes)
1944 **  the MIT KRB5 internal function krb5_validate_times() and the
1945 **  in_clock_skew() macro.  The authenticator client time is checked
1946 **  to be within clockskew secs of the current time and the current
1947 **  time is checked to be within the ticket start and expire times.
1948 **  Either check may be omitted by supplying a NULL value.
1949 **  Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
1950 **  See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
1951 **  20010420 VRS
1952 */
1953 krb5_error_code  kssl_validate_times(   krb5_timestamp atime,
1954                                         krb5_ticket_times *ttimes)
1955         {
1956         krb5_deltat     skew;
1957         krb5_timestamp  start, now;
1958         krb5_error_code rc;
1959         krb5_context    context;
1960
1961         if ((rc = krb5_init_context(&context)))  return SSL_R_KRB5_S_BAD_TICKET;
1962         skew = get_rc_clockskew(context); 
1963         if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
1964         krb5_free_context(context);
1965
1966         if (atime  &&  labs(atime - now) >= skew)  return SSL_R_KRB5_S_TKT_SKEW;
1967
1968         if (! ttimes)  return 0;
1969
1970         start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
1971         if (start - now > skew)  return SSL_R_KRB5_S_TKT_NYV;
1972         if ((now - ttimes->endtime) > skew)  return SSL_R_KRB5_S_TKT_EXPIRED;
1973
1974 #ifdef KSSL_DEBUG
1975         printf("kssl_validate_times: %d |<-  | %d - %d | < %d  ->| %d\n",
1976                 start, atime, now, skew, ttimes->endtime);
1977 #endif  /* KSSL_DEBUG */
1978
1979         return 0;
1980         }
1981
1982
1983 /*  Decode and decrypt given DER-encoded authenticator, then pass
1984 **  authenticator ctime back in *atimep (or 0 if time unavailable).
1985 **  Returns krb5_error_code and kssl_err on error.  A NULL 
1986 **  authenticator (authentp->length == 0) is not considered an error.
1987 **  Note that kssl_check_authent() makes use of the KRB5 session key;
1988 **  you must call kssl_sget_tkt() to get the key before calling this routine.
1989 */
1990 krb5_error_code  kssl_check_authent(
1991                         /* IN     */    KSSL_CTX        *kssl_ctx,
1992                         /* IN     */    krb5_data       *authentp,
1993                         /* OUT    */    krb5_timestamp  *atimep,
1994                         /* OUT    */    KSSL_ERR        *kssl_err  )
1995         {
1996         krb5_error_code         krb5rc = 0;
1997         KRB5_ENCDATA            *dec_authent = NULL;
1998         KRB5_AUTHENTBODY        *auth = NULL;
1999         krb5_enctype            enctype;
2000         EVP_CIPHER_CTX          ciph_ctx;
2001         const EVP_CIPHER        *enc = NULL;
2002         unsigned char           iv[EVP_MAX_IV_LENGTH];
2003         const unsigned char     *p;
2004         unsigned char           *unenc_authent;
2005         int                     outl, unencbufsize;
2006         struct tm               tm_time, *tm_l, *tm_g;
2007         time_t                  now, tl, tg, tr, tz_offset;
2008
2009         EVP_CIPHER_CTX_init(&ciph_ctx);
2010         *atimep = 0;
2011         kssl_err_set(kssl_err, 0, "");
2012
2013 #ifndef KRB5CHECKAUTH
2014         authentp = NULL;
2015 #else
2016 #if     KRB5CHECKAUTH == 0
2017         authentp = NULL;
2018 #endif
2019 #endif  /* KRB5CHECKAUTH */
2020
2021         if (authentp == NULL  ||  authentp->length == 0)  return 0;
2022
2023 #ifdef KSSL_DEBUG
2024         {
2025         unsigned int ui;
2026         printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
2027         p = authentp->data; 
2028         for (ui=0; ui < authentp->length; ui++)  printf("%02x ",p[ui]);
2029         printf("\n");
2030         }
2031 #endif  /* KSSL_DEBUG */
2032
2033         unencbufsize = 2 * authentp->length;
2034         if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
2035                 {
2036                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2037                         "Unable to allocate authenticator buffer.\n");
2038                 krb5rc = KRB5KRB_ERR_GENERIC;
2039                 goto err;
2040                 }
2041
2042         p = (unsigned char *)authentp->data;
2043         if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
2044                                         (long) authentp->length)) == NULL) 
2045                 {
2046                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2047                         "Error decoding authenticator.\n");
2048                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2049                 goto err;
2050                 }
2051
2052         enctype = dec_authent->etype->data[0];  /* should = kssl_ctx->enctype */
2053 #if !defined(KRB5_MIT_OLD11)
2054             switch ( enctype ) {
2055             case ENCTYPE_DES3_CBC_SHA1:         /*    EVP_des_ede3_cbc();  */
2056             case ENCTYPE_DES3_CBC_SHA:
2057             case ENCTYPE_DES3_CBC_RAW:
2058                 krb5rc = 0;                     /* Skip, can't handle derived keys */
2059                 goto err;
2060             }
2061 #endif
2062         enc = kssl_map_enc(enctype);
2063         memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2064
2065         if (enc == NULL)
2066                 {
2067                 /*  Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.
2068                 **  This enctype indicates the authenticator was encrypted
2069                 **  using key-usage derived keys which openssl cannot decrypt.
2070                 */
2071                 goto err;
2072                 }
2073
2074         if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0))
2075                 {
2076                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2077                         "EVP_CipherInit error decrypting authenticator.\n");
2078                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2079                 goto err;
2080                 }
2081         outl = dec_authent->cipher->length;
2082         if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl))
2083                 {
2084                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2085                         "EVP_Cipher error decrypting authenticator.\n");
2086                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2087                 goto err;
2088                 }
2089         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2090
2091 #ifdef KSSL_DEBUG
2092         printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
2093         for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
2094         printf("\n");
2095 #endif  /* KSSL_DEBUG */
2096
2097         if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
2098                 {
2099                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2100                         "confounded by authenticator.\n");
2101                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2102                 goto err;
2103                 }
2104         outl -= p - unenc_authent;
2105
2106         if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
2107                                                           (long) outl))==NULL)
2108                 {
2109                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2110                         "Error decoding authenticator body.\n");
2111                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2112                 goto err;
2113                 }
2114
2115         memset(&tm_time,0,sizeof(struct tm));
2116         if (k_gmtime(auth->ctime, &tm_time)  &&
2117                 ((tr = mktime(&tm_time)) != (time_t)(-1)))
2118                 {
2119                 now  = time(&now);
2120                 tm_l = localtime(&now);         tl = mktime(tm_l);
2121                 tm_g = gmtime(&now);            tg = mktime(tm_g);
2122                 tz_offset = tg - tl;
2123
2124                 *atimep = tr - tz_offset;
2125                 }
2126
2127 #ifdef KSSL_DEBUG
2128         printf("kssl_check_authent: returns %d for client time ", *atimep);
2129         if (auth && auth->ctime && auth->ctime->length && auth->ctime->data)
2130                 printf("%.*s\n", auth->ctime->length, auth->ctime->data);
2131         else    printf("NULL\n");
2132 #endif  /* KSSL_DEBUG */
2133
2134  err:
2135         if (auth)               KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2136         if (dec_authent)        KRB5_ENCDATA_free(dec_authent);
2137         if (unenc_authent)      free(unenc_authent);
2138         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2139         return krb5rc;
2140         }
2141
2142
2143 /*  Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2144 **  because I dont't know how to stub varargs.
2145 **  Returns krb5_error_code == ENOMEM on alloc error, otherwise
2146 **  passes back newly constructed principal, which should be freed by caller.
2147 */
2148 krb5_error_code  kssl_build_principal_2(
2149                         /* UPDATE */    krb5_context    context,
2150                         /* OUT    */    krb5_principal  *princ,
2151                         /* IN     */    int rlen,  const char *realm,
2152                         /* IN     */    int slen,  const char *svc,
2153                         /* IN     */    int hlen,  const char *host)
2154         {
2155         krb5_data               *p_data = NULL;
2156         krb5_principal          new_p = NULL;
2157         char                    *new_r = NULL;
2158
2159         if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL  ||
2160             (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
2161                         == NULL)  goto err;
2162         new_p->length = 2;
2163         new_p->data = p_data;
2164
2165         if ((new_r = calloc(1, rlen + 1)) == NULL)  goto err;
2166         memcpy(new_r, realm, rlen);
2167         krb5_princ_set_realm_length(context, new_p, rlen);
2168         krb5_princ_set_realm_data(context, new_p, new_r);
2169
2170         if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL)  goto err;
2171         memcpy(new_p->data[0].data, svc, slen);
2172         new_p->data[0].length = slen;
2173
2174         if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL)  goto err;
2175         memcpy(new_p->data[1].data, host, hlen);
2176         new_p->data[1].length = hlen;
2177         
2178         krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2179         *princ = new_p;
2180         return 0;
2181
2182  err:
2183         if (new_p  &&  new_p[0].data)   free(new_p[0].data);
2184         if (new_p  &&  new_p[1].data)   free(new_p[1].data);
2185         if (new_p)      free(new_p);
2186         if (new_r)      free(new_r);
2187         return ENOMEM;
2188         }
2189
2190
2191 #else /* !OPENSSL_NO_KRB5 */
2192
2193 #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2194 static void *dummy=&dummy;
2195 #endif
2196
2197 #endif  /* !OPENSSL_NO_KRB5     */
2198