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 #define _XOPEN_SOURCE /* glibc2 needs this to declare strptime() */
  72 #include <time.h>
  73 #include <string.h>
  74
  75 #include <openssl/ssl.h>
  76 #include <openssl/evp.h>
  77 #include <openssl/objects.h>
  78 #include <openssl/krb5_asn.h>
  79
  80 #ifndef OPENSSL_NO_KRB5
  81
  82 /*
  83  * When OpenSSL is built on Windows, we do not want to require that
  84  * the Kerberos DLLs be available in order for the OpenSSL DLLs to
  85  * work.  Therefore, all Kerberos routines are loaded at run time
  86  * and we do not link to a .LIB file.
  87  */
  88
  89 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
  90 /*
  91  * The purpose of the following pre-processor statements is to provide
  92  * compatibility with different releases of MIT Kerberos for Windows.
  93  * All versions up to 1.2 used macros.  But macros do not allow for
  94  * a binary compatible interface for DLLs.  Therefore, all macros are
  95  * being replaced by function calls.  The following code will allow
  96  * an OpenSSL DLL built on Windows to work whether or not the macro
  97  * or function form of the routines are utilized.
  98  */
  99 #ifdef  krb5_cc_get_principal
 100 #define NO_DEF_KRB5_CCACHE
 101 #undef  krb5_cc_get_principal
 102 #endif
 103 #define krb5_cc_get_principal    kssl_krb5_cc_get_principal
 104
 105 #define krb5_free_data_contents  kssl_krb5_free_data_contents
 106 #define krb5_free_context        kssl_krb5_free_context
 107 #define krb5_auth_con_free       kssl_krb5_auth_con_free
 108 #define krb5_free_principal      kssl_krb5_free_principal
 109 #define krb5_mk_req_extended     kssl_krb5_mk_req_extended
 110 #define krb5_get_credentials     kssl_krb5_get_credentials
 111 #define krb5_cc_default          kssl_krb5_cc_default
 112 #define krb5_sname_to_principal  kssl_krb5_sname_to_principal
 113 #define krb5_init_context        kssl_krb5_init_context
 114 #define krb5_free_ticket         kssl_krb5_free_ticket
 115 #define krb5_rd_req              kssl_krb5_rd_req
 116 #define krb5_kt_default          kssl_krb5_kt_default
 117 #define krb5_kt_resolve          kssl_krb5_kt_resolve
 118 /* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */
 119 #ifndef krb5_kt_close
 120 #define krb5_kt_close            kssl_krb5_kt_close
 121 #endif /* krb5_kt_close */
 122 #ifndef krb5_kt_get_entry
 123 #define krb5_kt_get_entry        kssl_krb5_kt_get_entry
 124 #endif /* krb5_kt_get_entry */
 125 #define krb5_auth_con_init       kssl_krb5_auth_con_init
 126
 127 #define krb5_principal_compare   kssl_krb5_principal_compare
 128 #define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
 129 #define krb5_timeofday           kssl_krb5_timeofday
 130 #define krb5_rc_default           kssl_krb5_rc_default
 131
 132 #ifdef krb5_rc_initialize
 133 #undef krb5_rc_initialize
 134 #endif
 135 #define krb5_rc_initialize   kssl_krb5_rc_initialize
 136
 137 #ifdef krb5_rc_get_lifespan
 138 #undef krb5_rc_get_lifespan
 139 #endif
 140 #define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
 141
 142 #ifdef krb5_rc_destroy
 143 #undef krb5_rc_destroy
 144 #endif
 145 #define krb5_rc_destroy      kssl_krb5_rc_destroy
 146
 147 #define valid_cksumtype      kssl_valid_cksumtype
 148 #define krb5_checksum_size   kssl_krb5_checksum_size
 149 #define krb5_kt_free_entry   kssl_krb5_kt_free_entry
 150 #define krb5_auth_con_setrcache  kssl_krb5_auth_con_setrcache
 151 #define krb5_auth_con_getrcache  kssl_krb5_auth_con_getrcache
 152 #define krb5_get_server_rcache   kssl_krb5_get_server_rcache
 153
 154 /* Prototypes for built in stubs */
 155 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
 156 void kssl_krb5_free_principal(krb5_context, krb5_principal );
 157 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
 158                                      krb5_const char *,
 159                                      krb5_keytab *);
 160 krb5_error_code kssl_krb5_kt_default(krb5_context,
 161                                      krb5_keytab *);
 162 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
 163 krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *,
 164                                  krb5_const krb5_data *,
 165                                  krb5_const_principal, krb5_keytab,
 166                                  krb5_flags *,krb5_ticket **);
 167
 168 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
 169                                          krb5_const_principal);
 170 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
 171                                           krb5_auth_context  *,
 172                                           krb5_const krb5_flags,
 173                                           krb5_data  *,
 174                                           krb5_creds  *,
 175                                           krb5_data  * );
 176 krb5_error_code kssl_krb5_init_context(krb5_context *);
 177 void kssl_krb5_free_context(krb5_context);
 178 krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache  *);
 179 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
 180                                              krb5_const char  *,
 181                                              krb5_const char  *,
 182                                              krb5_int32,
 183                                              krb5_principal  *);
 184 krb5_error_code kssl_krb5_get_credentials(krb5_context,
 185                                           krb5_const krb5_flags,
 186                                           krb5_ccache,
 187                                           krb5_creds  *,
 188                                           krb5_creds  *  *);
 189 krb5_error_code kssl_krb5_auth_con_init(krb5_context,
 190                                         krb5_auth_context  *);
 191 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context,
 192                                            krb5_ccache cache,
 193                                            krb5_principal *principal);
 194 krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
 195 size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
 196 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
 197 krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
 198 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context,
 199                                              krb5_auth_context,
 200                                              krb5_rcache);
 201 krb5_error_code kssl_krb5_get_server_rcache(krb5_context,
 202                                             krb5_const krb5_data *,
 203                                             krb5_rcache *);
 204 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context,
 205                                              krb5_auth_context,
 206                                              krb5_rcache *);
 207
 208 /* Function pointers (almost all Kerberos functions are _stdcall) */
 209 static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
 210         =NULL;
 211 static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
 212         =NULL;
 213 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
 214                         (krb5_context, krb5_const char *, krb5_keytab *)=NULL;
 215 static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
 216                                                      krb5_keytab *)=NULL;
 217 static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context,
 218                                                       krb5_ticket *)=NULL;
 219 static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context,
 220                                                  krb5_auth_context *,
 221                                                  krb5_const krb5_data *,
 222                                                  krb5_const_principal,
 223                                                  krb5_keytab, krb5_flags *,
 224                                                  krb5_ticket **)=NULL;
 225 static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
 226                         (krb5_context, krb5_auth_context *,
 227                          krb5_const krb5_flags, krb5_data *, krb5_creds *,
 228                          krb5_data * )=NULL;
 229 static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
 230 static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
 231 static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
 232                                                      krb5_ccache  *)=NULL;
 233 static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
 234                         (krb5_context, krb5_const char *, krb5_const char *,
 235                          krb5_int32, krb5_principal *)=NULL;
 236 static krb5_error_code (_stdcall *p_krb5_get_credentials)
 237                         (krb5_context, krb5_const krb5_flags, krb5_ccache,
 238                          krb5_creds *, krb5_creds **)=NULL;
 239 static krb5_error_code (_stdcall *p_krb5_auth_con_init)
 240                         (krb5_context, krb5_auth_context *)=NULL;
 241 static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
 242                         (krb5_context context, krb5_ccache cache,
 243                          krb5_principal *principal)=NULL;
 244 static krb5_error_code (_stdcall *p_krb5_auth_con_free)
 245                         (krb5_context, krb5_auth_context)=NULL;
 246 static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
 247                         (krb5_context, krb5_const krb5_keyblock *,
 248                                            krb5_ticket *)=NULL;
 249 static krb5_error_code (_stdcall *p_krb5_timeofday)
 250                         (krb5_context context, krb5_int32 *timeret)=NULL;
 251 static krb5_error_code (_stdcall *p_krb5_rc_default)
 252                         (krb5_context context, krb5_rcache *rc)=NULL;
 253 static krb5_error_code (_stdcall *p_krb5_rc_initialize)
 254                         (krb5_context context, krb5_rcache rc,
 255                                      krb5_deltat lifespan)=NULL;
 256 static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
 257                         (krb5_context context, krb5_rcache rc,
 258                                        krb5_deltat *lifespan)=NULL;
 259 static krb5_error_code (_stdcall *p_krb5_rc_destroy)
 260                         (krb5_context context, krb5_rcache rc)=NULL;
 261 static krb5_boolean (_stdcall *p_krb5_principal_compare)
 262                      (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
 263 static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
 264 static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
 265 static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
 266                         (krb5_context,krb5_keytab_entry * )=NULL;
 267 static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context,
 268                                                                krb5_auth_context,
 269                                                                krb5_rcache)=NULL;
 270 static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context,
 271                                                               krb5_const krb5_data *,
 272                                                               krb5_rcache *)=NULL;
 273 static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context,
 274                                                       krb5_auth_context,
 275                                                       krb5_rcache *)=NULL;
 276 static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context,
 277                                                     krb5_keytab keytab)=NULL;
 278 static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context,
 279                                                         krb5_keytab keytab,
 280                        krb5_const_principal principal, krb5_kvno vno,
 281                        krb5_enctype enctype, krb5_keytab_entry *entry)=NULL;
 282 static int krb5_loaded = 0;     /* only attempt to initialize func ptrs once */
 283
 284 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
 285 void
 286 load_krb5_dll(void)
 287         {
 288         HANDLE hKRB5_32;
 289
 290         krb5_loaded++;
 291         hKRB5_32 = LoadLibrary("KRB5_32");
 292         if (!hKRB5_32)
 293                 return;
 294
 295         (FARPROC) p_krb5_free_data_contents =
 296                 GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
 297         (FARPROC) p_krb5_free_context =
 298                 GetProcAddress( hKRB5_32, "krb5_free_context" );
 299         (FARPROC) p_krb5_auth_con_free =
 300                 GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
 301         (FARPROC) p_krb5_free_principal =
 302                 GetProcAddress( hKRB5_32, "krb5_free_principal" );
 303         (FARPROC) p_krb5_mk_req_extended =
 304                 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
 305         (FARPROC) p_krb5_get_credentials =
 306                 GetProcAddress( hKRB5_32, "krb5_get_credentials" );
 307         (FARPROC) p_krb5_cc_get_principal =
 308                 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
 309         (FARPROC) p_krb5_cc_default =
 310                 GetProcAddress( hKRB5_32, "krb5_cc_default" );
 311         (FARPROC) p_krb5_sname_to_principal =
 312                 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
 313         (FARPROC) p_krb5_init_context =
 314                 GetProcAddress( hKRB5_32, "krb5_init_context" );
 315         (FARPROC) p_krb5_free_ticket =
 316                 GetProcAddress( hKRB5_32, "krb5_free_ticket" );
 317         (FARPROC) p_krb5_rd_req =
 318                 GetProcAddress( hKRB5_32, "krb5_rd_req" );
 319         (FARPROC) p_krb5_principal_compare =
 320                 GetProcAddress( hKRB5_32, "krb5_principal_compare" );
 321         (FARPROC) p_krb5_decrypt_tkt_part =
 322                 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
 323         (FARPROC) p_krb5_timeofday =
 324                 GetProcAddress( hKRB5_32, "krb5_timeofday" );
 325         (FARPROC) p_krb5_rc_default =
 326                 GetProcAddress( hKRB5_32, "krb5_rc_default" );
 327         (FARPROC) p_krb5_rc_initialize =
 328                 GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
 329         (FARPROC) p_krb5_rc_get_lifespan =
 330                 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
 331         (FARPROC) p_krb5_rc_destroy =
 332                 GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
 333         (FARPROC) p_krb5_kt_default =
 334                 GetProcAddress( hKRB5_32, "krb5_kt_default" );
 335         (FARPROC) p_krb5_kt_resolve =
 336                 GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
 337         (FARPROC) p_krb5_auth_con_init =
 338                 GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
 339         (FARPROC) p_valid_cksumtype =
 340                 GetProcAddress( hKRB5_32, "valid_cksumtype" );
 341         (FARPROC) p_krb5_checksum_size =
 342                 GetProcAddress( hKRB5_32, "krb5_checksum_size" );
 343         (FARPROC) p_krb5_kt_free_entry =
 344                 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
 345         (FARPROC) p_krb5_auth_con_setrcache =
 346                 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
 347         (FARPROC) p_krb5_get_server_rcache =
 348                 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
 349         (FARPROC) p_krb5_auth_con_getrcache =
 350                 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
 351         (FARPROC) p_krb5_kt_close =
 352                 GetProcAddress( hKRB5_32, "krb5_kt_close" );
 353         (FARPROC) p_krb5_kt_get_entry =
 354                 GetProcAddress( hKRB5_32, "krb5_kt_get_entry" );
 355         }
 356
 357 /* Stubs for each function to be dynamicly loaded */
 358 void
 359 kssl_krb5_free_data_contents(krb5_context CO, krb5_data  * data)
 360         {
 361         if (!krb5_loaded)
 362                 load_krb5_dll();
 363
 364         if ( p_krb5_free_data_contents )
 365                 p_krb5_free_data_contents(CO,data);
 366         }
 367
 368 krb5_error_code
 369 kssl_krb5_mk_req_extended (krb5_context CO,
 370                           krb5_auth_context  * pACO,
 371                           krb5_const krb5_flags F,
 372                           krb5_data  * pD1,
 373                           krb5_creds  * pC,
 374                           krb5_data  * pD2)
 375         {
 376         if (!krb5_loaded)
 377                 load_krb5_dll();
 378
 379         if ( p_krb5_mk_req_extended )
 380                 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
 381         else
 382                 return KRB5KRB_ERR_GENERIC;
 383         }
 384 krb5_error_code
 385 kssl_krb5_auth_con_init(krb5_context CO,
 386                        krb5_auth_context  * pACO)
 387         {
 388         if (!krb5_loaded)
 389                 load_krb5_dll();
 390
 391         if ( p_krb5_auth_con_init )
 392                 return(p_krb5_auth_con_init(CO,pACO));
 393         else
 394                 return KRB5KRB_ERR_GENERIC;
 395         }
 396 krb5_error_code
 397 kssl_krb5_auth_con_free (krb5_context CO,
 398                         krb5_auth_context ACO)
 399         {
 400         if (!krb5_loaded)
 401                 load_krb5_dll();
 402
 403         if ( p_krb5_auth_con_free )
 404                 return(p_krb5_auth_con_free(CO,ACO));
 405         else
 406                 return KRB5KRB_ERR_GENERIC;
 407         }
 408 krb5_error_code
 409 kssl_krb5_get_credentials(krb5_context CO,
 410                          krb5_const krb5_flags F,
 411                          krb5_ccache CC,
 412                          krb5_creds  * pCR,
 413                          krb5_creds  ** ppCR)
 414         {
 415         if (!krb5_loaded)
 416                 load_krb5_dll();
 417
 418         if ( p_krb5_get_credentials )
 419                 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
 420         else
 421                 return KRB5KRB_ERR_GENERIC;
 422         }
 423 krb5_error_code
 424 kssl_krb5_sname_to_principal(krb5_context CO,
 425                             krb5_const char  * pC1,
 426                             krb5_const char  * pC2,
 427                             krb5_int32 I,
 428                             krb5_principal  * pPR)
 429         {
 430         if (!krb5_loaded)
 431                 load_krb5_dll();
 432
 433         if ( p_krb5_sname_to_principal )
 434                 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
 435         else
 436                 return KRB5KRB_ERR_GENERIC;
 437         }
 438
 439 krb5_error_code
 440 kssl_krb5_cc_default(krb5_context CO,
 441                     krb5_ccache  * pCC)
 442         {
 443         if (!krb5_loaded)
 444                 load_krb5_dll();
 445
 446         if ( p_krb5_cc_default )
 447                 return(p_krb5_cc_default(CO,pCC));
 448         else
 449                 return KRB5KRB_ERR_GENERIC;
 450         }
 451
 452 krb5_error_code
 453 kssl_krb5_init_context(krb5_context * pCO)
 454         {
 455         if (!krb5_loaded)
 456                 load_krb5_dll();
 457
 458         if ( p_krb5_init_context )
 459                 return(p_krb5_init_context(pCO));
 460         else
 461                 return KRB5KRB_ERR_GENERIC;
 462         }
 463
 464 void
 465 kssl_krb5_free_context(krb5_context CO)
 466         {
 467         if (!krb5_loaded)
 468                 load_krb5_dll();
 469
 470         if ( p_krb5_free_context )
 471                 p_krb5_free_context(CO);
 472         }
 473
 474 void
 475 kssl_krb5_free_principal(krb5_context c, krb5_principal p)
 476         {
 477         if (!krb5_loaded)
 478                 load_krb5_dll();
 479
 480         if ( p_krb5_free_principal )
 481                 p_krb5_free_principal(c,p);
 482         }
 483
 484 krb5_error_code
 485 kssl_krb5_kt_resolve(krb5_context con,
 486                     krb5_const char * sz,
 487                     krb5_keytab * kt)
 488         {
 489         if (!krb5_loaded)
 490                 load_krb5_dll();
 491
 492         if ( p_krb5_kt_resolve )
 493                 return(p_krb5_kt_resolve(con,sz,kt));
 494         else
 495                 return KRB5KRB_ERR_GENERIC;
 496         }
 497
 498 krb5_error_code
 499 kssl_krb5_kt_default(krb5_context con,
 500                     krb5_keytab * kt)
 501         {
 502         if (!krb5_loaded)
 503                 load_krb5_dll();
 504
 505         if ( p_krb5_kt_default )
 506                 return(p_krb5_kt_default(con,kt));
 507         else
 508                 return KRB5KRB_ERR_GENERIC;
 509         }
 510
 511 krb5_error_code
 512 kssl_krb5_free_ticket(krb5_context con,
 513                      krb5_ticket * kt)
 514         {
 515         if (!krb5_loaded)
 516                 load_krb5_dll();
 517
 518         if ( p_krb5_free_ticket )
 519                 return(p_krb5_free_ticket(con,kt));
 520         else
 521                 return KRB5KRB_ERR_GENERIC;
 522         }
 523
 524 krb5_error_code
 525 kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
 526                 krb5_const krb5_data * data,
 527                 krb5_const_principal princ, krb5_keytab keytab,
 528                 krb5_flags * flags, krb5_ticket ** pptkt)
 529         {
 530         if (!krb5_loaded)
 531                 load_krb5_dll();
 532
 533         if ( p_krb5_rd_req )
 534                 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
 535         else
 536                 return KRB5KRB_ERR_GENERIC;
 537         }
 538
 539 krb5_boolean
 540 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
 541                 krb5_const_principal princ2)
 542         {
 543         if (!krb5_loaded)
 544                 load_krb5_dll();
 545
 546         if ( p_krb5_principal_compare )
 547                 return(p_krb5_principal_compare(con,princ1,princ2));
 548         else
 549                 return KRB5KRB_ERR_GENERIC;
 550         }
 551
 552 krb5_error_code
 553 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
 554                 krb5_ticket *ticket)
 555         {
 556         if (!krb5_loaded)
 557                 load_krb5_dll();
 558
 559         if ( p_krb5_decrypt_tkt_part )
 560                 return(p_krb5_decrypt_tkt_part(con,keys,ticket));
 561         else
 562                 return KRB5KRB_ERR_GENERIC;
 563         }
 564
 565 krb5_error_code
 566 krb5_timeofday(krb5_context con, krb5_int32 *timeret)
 567         {
 568         if (!krb5_loaded)
 569                 load_krb5_dll();
 570
 571         if ( p_krb5_timeofday )
 572                 return(p_krb5_timeofday(con,timeret));
 573         else
 574                 return KRB5KRB_ERR_GENERIC;
 575         }
 576
 577 krb5_error_code
 578 krb5_rc_default(krb5_context con, krb5_rcache *rc)
 579         {
 580         if (!krb5_loaded)
 581                 load_krb5_dll();
 582
 583         if ( p_krb5_rc_default )
 584                 return(p_krb5_rc_default(con,rc));
 585         else
 586                 return KRB5KRB_ERR_GENERIC;
 587         }
 588
 589 krb5_error_code
 590 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
 591         {
 592         if (!krb5_loaded)
 593                 load_krb5_dll();
 594
 595         if ( p_krb5_rc_initialize )
 596                 return(p_krb5_rc_initialize(con, rc, lifespan));
 597         else
 598                 return KRB5KRB_ERR_GENERIC;
 599         }
 600
 601 krb5_error_code
 602 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
 603         {
 604         if (!krb5_loaded)
 605                 load_krb5_dll();
 606
 607         if ( p_krb5_rc_get_lifespan )
 608                 return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
 609         else
 610                 return KRB5KRB_ERR_GENERIC;
 611         }
 612
 613 krb5_error_code
 614 krb5_rc_destroy(krb5_context con, krb5_rcache rc)
 615         {
 616         if (!krb5_loaded)
 617                 load_krb5_dll();
 618
 619         if ( p_krb5_rc_destroy )
 620                 return(p_krb5_rc_destroy(con, rc));
 621         else
 622                 return KRB5KRB_ERR_GENERIC;
 623         }
 624
 625 size_t
 626 krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
 627         {
 628         if (!krb5_loaded)
 629                 load_krb5_dll();
 630
 631         if ( p_krb5_checksum_size )
 632                 return(p_krb5_checksum_size(context, ctype));
 633         else
 634                 return KRB5KRB_ERR_GENERIC;
 635         }
 636
 637 krb5_boolean
 638 valid_cksumtype(krb5_cksumtype ctype)
 639         {
 640         if (!krb5_loaded)
 641                 load_krb5_dll();
 642
 643         if ( p_valid_cksumtype )
 644                 return(p_valid_cksumtype(ctype));
 645         else
 646                 return KRB5KRB_ERR_GENERIC;
 647         }
 648
 649 krb5_error_code
 650 krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
 651         {
 652         if (!krb5_loaded)
 653                 load_krb5_dll();
 654
 655         if ( p_krb5_kt_free_entry )
 656                 return(p_krb5_kt_free_entry(con,entry));
 657         else
 658                 return KRB5KRB_ERR_GENERIC;
 659         }
 660
 661 /* Structure definitions  */
 662 #ifndef NO_DEF_KRB5_CCACHE
 663 #ifndef krb5_x
 664 #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
 665 #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
 666 #endif
 667
 668 typedef krb5_pointer    krb5_cc_cursor; /* cursor for sequential lookup */
 669
 670 typedef struct _krb5_ccache
 671         {
 672         krb5_magic magic;
 673         struct _krb5_cc_ops FAR *ops;
 674         krb5_pointer data;
 675         } *krb5_ccache;
 676
 677 typedef struct _krb5_cc_ops
 678         {
 679         krb5_magic magic;
 680         char  *prefix;
 681         char  * (KRB5_CALLCONV *get_name)
 682                 (krb5_context, krb5_ccache);
 683         krb5_error_code (KRB5_CALLCONV *resolve)
 684                 (krb5_context, krb5_ccache  *, const char  *);
 685         krb5_error_code (KRB5_CALLCONV *gen_new)
 686                 (krb5_context, krb5_ccache  *);
 687         krb5_error_code (KRB5_CALLCONV *init)
 688                 (krb5_context, krb5_ccache, krb5_principal);
 689         krb5_error_code (KRB5_CALLCONV *destroy)
 690                 (krb5_context, krb5_ccache);
 691         krb5_error_code (KRB5_CALLCONV *close)
 692                 (krb5_context, krb5_ccache);
 693         krb5_error_code (KRB5_CALLCONV *store)
 694                 (krb5_context, krb5_ccache, krb5_creds  *);
 695         krb5_error_code (KRB5_CALLCONV *retrieve)
 696                 (krb5_context, krb5_ccache,
 697                 krb5_flags, krb5_creds  *, krb5_creds  *);
 698         krb5_error_code (KRB5_CALLCONV *get_princ)
 699                 (krb5_context, krb5_ccache, krb5_principal  *);
 700         krb5_error_code (KRB5_CALLCONV *get_first)
 701                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
 702         krb5_error_code (KRB5_CALLCONV *get_next)
 703                 (krb5_context, krb5_ccache,
 704                 krb5_cc_cursor  *, krb5_creds  *);
 705         krb5_error_code (KRB5_CALLCONV *end_get)
 706                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
 707         krb5_error_code (KRB5_CALLCONV *remove_cred)
 708                 (krb5_context, krb5_ccache,
 709                 krb5_flags, krb5_creds  *);
 710         krb5_error_code (KRB5_CALLCONV *set_flags)
 711                 (krb5_context, krb5_ccache, krb5_flags);
 712         } krb5_cc_ops;
 713 #endif /* NO_DEF_KRB5_CCACHE */
 714
 715 krb5_error_code
 716 kssl_krb5_cc_get_principal
 717     (krb5_context context, krb5_ccache cache,
 718       krb5_principal *principal)
 719         {
 720         if ( p_krb5_cc_get_principal )
 721                 return(p_krb5_cc_get_principal(context,cache,principal));
 722         else
 723                 return(krb5_x
 724                         ((cache)->ops->get_princ,(context, cache, principal)));
 725         }
 726
 727 krb5_error_code
 728 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
 729                              krb5_rcache rcache)
 730         {
 731         if ( p_krb5_auth_con_setrcache )
 732                  return(p_krb5_auth_con_setrcache(con,acon,rcache));
 733         else
 734                  return KRB5KRB_ERR_GENERIC;
 735         }
 736
 737 krb5_error_code
 738 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
 739                             krb5_rcache * rcache)
 740         {
 741         if ( p_krb5_get_server_rcache )
 742                 return(p_krb5_get_server_rcache(con,data,rcache));
 743         else
 744                 return KRB5KRB_ERR_GENERIC;
 745         }
 746
 747 krb5_error_code
 748 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
 749                              krb5_rcache * prcache)
 750         {
 751         if ( p_krb5_auth_con_getrcache )
 752                 return(p_krb5_auth_con_getrcache(con,acon, prcache));
 753         else
 754                 return KRB5KRB_ERR_GENERIC;
 755         }
 756
 757 krb5_error_code
 758 kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab)
 759         {
 760         if ( p_krb5_kt_close )
 761                 return(p_krb5_kt_close(context,keytab));
 762         else
 763                 return KRB5KRB_ERR_GENERIC;
 764         }
 765
 766 krb5_error_code
 767 kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
 768                        krb5_const_principal principal, krb5_kvno vno,
 769                        krb5_enctype enctype, krb5_keytab_entry *entry)
 770         {
 771         if ( p_krb5_kt_get_entry )
 772                 return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry));
 773         else
 774                 return KRB5KRB_ERR_GENERIC;
 775         }
 776 #endif  /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
 777
 778 char
 779 *kstring(char *string)
 780         {
 781         static char     *null = "[NULL]";
 782
 783         return ((string == NULL)? null: string);
 784         }
 785
 786 /*      Given KRB5 enctype (basically DES or 3DES),
 787 **      return closest match openssl EVP_ encryption algorithm.
 788 **      Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes.
 789 **      Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK.
 790 */
 791 const EVP_CIPHER *
 792 kssl_map_enc(krb5_enctype enctype)
 793         {
 794         switch (enctype)
 795                 {
 796         case ENCTYPE_DES_HMAC_SHA1:             /*    EVP_des_cbc();       */
 797         case ENCTYPE_DES_CBC_CRC:
 798         case ENCTYPE_DES_CBC_MD4:
 799         case ENCTYPE_DES_CBC_MD5:
 800         case ENCTYPE_DES_CBC_RAW:
 801                                 return EVP_des_cbc();
 802                                 break;
 803         case ENCTYPE_DES3_CBC_SHA1:             /*    EVP_des_ede3_cbc();  */
 804         case ENCTYPE_DES3_CBC_SHA:
 805         case ENCTYPE_DES3_CBC_RAW:
 806                                 return EVP_des_ede3_cbc();
 807                                 break;
 808         default:                return NULL;
 809                                 break;
 810                 }
 811         }
 812
 813
 814 /*      Return true:1 if p "looks like" the start of the real authenticator
 815 **      described in kssl_skip_confound() below.  The ASN.1 pattern is
 816 **      "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
 817 **      xx and yy are possibly multi-byte length fields.
 818 */
 819 int     kssl_test_confound(unsigned char *p)
 820         {
 821         int     len = 2;
 822         int     xx = 0, yy = 0;
 823
 824         if (*p++ != 0x62)  return 0;
 825         if (*p > 0x82)  return 0;
 826         switch(*p)  {
 827                 case 0x82:  p++;          xx = (*p++ << 8);  xx += *p++;  break;
 828                 case 0x81:  p++;          xx =  *p++;  break;
 829                 case 0x80:  return 0;
 830                 default:    xx = *p++;  break;
 831                 }
 832         if (*p++ != 0x30)  return 0;
 833         if (*p > 0x82)  return 0;
 834         switch(*p)  {
 835                 case 0x82:  p++; len+=2;  yy = (*p++ << 8);  yy += *p++;  break;
 836                 case 0x81:  p++; len++;   yy =  *p++;  break;
 837                 case 0x80:  return 0;
 838                 default:    yy = *p++;  break;
 839                 }
 840
 841         return (xx - len == yy)? 1: 0;
 842         }
 843
 844 /*      Allocate, fill, and return cksumlens array of checksum lengths.
 845 **      This array holds just the unique elements from the krb5_cksumarray[].
 846 **      array[n] == 0 signals end of data.
 847 **
 848 **      The krb5_cksumarray[] was an internal variable that has since been
 849 **      replaced by a more general method for storing the data.  It should
 850 **      not be used.  Instead we use real API calls and make a guess for
 851 **      what the highest assigned CKSUMTYPE_ constant is.  As of 1.2.2
 852 **      it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3).  So we will use 0x0010.
 853 */
 854 size_t  *populate_cksumlens(void)
 855         {
 856         int             i, j, n;
 857         static size_t   *cklens = NULL;
 858
 859 #ifdef KRB5_MIT_OLD11
 860         n = krb5_max_cksum;
 861 #else
 862         n = 0x0010;
 863 #endif  /* KRB5_MIT_OLD11 */
 864
 865 #ifdef KRB5CHECKAUTH
 866         if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1)))  return NULL;
 867
 868         for (i=0; i < n; i++)  {
 869                 if (!valid_cksumtype(i))  continue;     /*  array has holes  */
 870                 for (j=0; j < n; j++)  {
 871                         if (cklens[j] == 0)  {
 872                                 cklens[j] = krb5_checksum_size(NULL,i);
 873                                 break;          /*  krb5 elem was new: add   */
 874                                 }
 875                         if (cklens[j] == krb5_checksum_size(NULL,i))  {
 876                                 break;          /*  ignore duplicate elements */
 877                                 }
 878                         }
 879                 }
 880 #endif  /* KRB5CHECKAUTH */
 881
 882         return cklens;
 883         }
 884
 885 /*      Return pointer to start of real authenticator within authenticator, or
 886 **      return NULL on error.
 887 **      Decrypted authenticator looks like this:
 888 **              [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
 889 **      This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
 890 **      krb5_auth_con_getcksumtype() function advertised in its krb5.h.
 891 */
 892 unsigned char   *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
 893         {
 894         int             i, conlen;
 895         size_t          cklen;
 896         static size_t   *cksumlens = NULL;
 897         unsigned char   *test_auth;
 898
 899         conlen = (etype)? 8: 0;
 900
 901         if (!cksumlens  &&  !(cksumlens = populate_cksumlens()))  return NULL;
 902         for (i=0; (cklen = cksumlens[i]) != 0; i++)
 903                 {
 904                 test_auth = a + conlen + cklen;
 905                 if (kssl_test_confound(test_auth))  return test_auth;
 906                 }
 907
 908         return NULL;
 909         }
 910
 911
 912 /*      Set kssl_err error info when reason text is a simple string
 913 **              kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
 914 */
 915 void
 916 kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
 917         {
 918         if (kssl_err == NULL)  return;
 919
 920         kssl_err->reason = reason;
 921         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text);
 922         return;
 923         }
 924
 925
 926 /*      Display contents of krb5_data struct, for debugging
 927 */
 928 void
 929 print_krb5_data(char *label, krb5_data *kdata)
 930         {
 931         int i;
 932
 933         printf("%s[%d] ", label, kdata->length);
 934         for (i=0; i < kdata->length; i++)
 935                 {
 936                 if (0 &&  isprint((int) kdata->data[i]))
 937                         printf( "%c ",  kdata->data[i]);
 938                 else
 939                         printf( "%02x ", (unsigned char) kdata->data[i]);
 940                 }
 941         printf("\n");
 942         }
 943
 944
 945 /*      Display contents of krb5_authdata struct, for debugging
 946 */
 947 void
 948 print_krb5_authdata(char *label, krb5_authdata **adata)
 949         {
 950         if (adata == NULL)
 951                 {
 952                 printf("%s, authdata==0\n", label);
 953                 return;
 954                 }
 955         printf("%s [%p]\n", label, adata);
 956 #if 0
 957         {
 958         int     i;
 959         printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
 960         for (i=0; i < adata->length; i++)
 961                 {
 962                 printf((isprint(adata->contents[i]))? "%c ": "%02x",
 963                         adata->contents[i]);
 964                 }
 965         printf("\n");
 966         }
 967 #endif
 968         }
 969
 970
 971 /*      Display contents of krb5_keyblock struct, for debugging
 972 */
 973 void
 974 print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
 975         {
 976         int i;
 977
 978         if (keyblk == NULL)
 979                 {
 980                 printf("%s, keyblk==0\n", label);
 981                 return;
 982                 }
 983 #ifdef KRB5_HEIMDAL
 984         printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
 985                                            keyblk->keyvalue->length);
 986         for (i=0; i < keyblk->keyvalue->length; i++)
 987                 {
 988                 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
 989                 }
 990         printf("\n");
 991 #else
 992         printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
 993         for (i=0; i < keyblk->length; i++)
 994                 {
 995                 printf("%02x",keyblk->contents[i]);
 996                 }
 997         printf("\n");
 998 #endif
 999         }
1000
1001
1002 /*      Display contents of krb5_principal_data struct, for debugging
1003 **      (krb5_principal is typedef'd == krb5_principal_data *)
1004 */
1005 void
1006 print_krb5_princ(char *label, krb5_principal_data *princ)
1007         {
1008         int i, ui, uj;
1009
1010         printf("%s principal Realm: ", label);
1011         if (princ == NULL)  return;
1012         for (ui=0; ui < princ->realm.length; ui++)  putchar(princ->realm.data[ui]);
1013         printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
1014         for (i=0; i < princ->length; i++)
1015                 {
1016                 printf("\t%d [%d]: ", i, princ->data[i].length);
1017                 for (uj=0; uj < princ->data[i].length; uj++)  {
1018                         putchar(princ->data[i].data[uj]);
1019                         }
1020                 printf("\n");
1021                 }
1022         return;
1023         }
1024
1025
1026 /*      Given krb5 service (typically "kssl") and hostname in kssl_ctx,
1027 **      Return encrypted Kerberos ticket for service @ hostname.
1028 **      If authenp is non-NULL, also return encrypted authenticator,
1029 **      whose data should be freed by caller.
1030 **      (Originally was: Create Kerberos AP_REQ message for SSL Client.)
1031 **
1032 **      19990628        VRS     Started; Returns Kerberos AP_REQ message.
1033 **      20010409        VRS     Modified for RFC2712; Returns enc tkt.
1034 **      20010606        VRS     May also return optional authenticator.
1035 */
1036 krb5_error_code
1037 kssl_cget_tkt(  /* UPDATE */    KSSL_CTX *kssl_ctx,
1038                 /* OUT    */    krb5_data **enc_ticketp,
1039                 /* UPDATE */    krb5_data *authenp,
1040                 /* OUT    */    KSSL_ERR *kssl_err)
1041         {
1042         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1043         krb5_context            krb5context = NULL;
1044         krb5_auth_context       krb5auth_context = NULL;
1045         krb5_ccache             krb5ccdef = NULL;
1046         krb5_creds              krb5creds, *krb5credsp = NULL;
1047         krb5_data               krb5_app_req;
1048
1049         kssl_err_set(kssl_err, 0, "");
1050         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1051
1052         if (!kssl_ctx)
1053                 {
1054                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1055                         "No kssl_ctx defined.\n");
1056                 goto err;
1057                 }
1058         else if (!kssl_ctx->service_host)
1059                 {
1060                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1061                         "kssl_ctx service_host undefined.\n");
1062                 goto err;
1063                 }
1064
1065         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1066                 {
1067                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1068                         "krb5_init_context() fails: %d\n", krb5rc);
1069                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1070                 goto err;
1071                 }
1072
1073         if ((krb5rc = krb5_sname_to_principal(krb5context,
1074                 kssl_ctx->service_host,
1075                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1076                 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1077                 {
1078                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1079                         "krb5_sname_to_principal() fails for %s/%s\n",
1080                         kssl_ctx->service_host,
1081                         (kssl_ctx->service_name)? kssl_ctx->service_name:
1082                                                   KRB5SVC);
1083                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1084                 goto err;
1085                 }
1086
1087         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1088                 {
1089                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1090                         "krb5_cc_default fails.\n");
1091                 goto err;
1092                 }
1093
1094         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1095                 &krb5creds.client)) != 0)
1096                 {
1097                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1098                         "krb5_cc_get_principal() fails.\n");
1099                 goto err;
1100                 }
1101
1102         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1103                 &krb5creds, &krb5credsp)) != 0)
1104                 {
1105                 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1106                         "krb5_get_credentials() fails.\n");
1107                 goto err;
1108                 }
1109
1110         *enc_ticketp = &krb5credsp->ticket;
1111 #ifdef KRB5_HEIMDAL
1112         kssl_ctx->enctype = krb5credsp->session.keytype;
1113 #else
1114         kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1115 #endif
1116
1117         krb5rc = KRB5KRB_ERR_GENERIC;
1118         /*      caller should free data of krb5_app_req  */
1119         /*  20010406 VRS deleted for real KerberosWrapper
1120         **  20010605 VRS reinstated to offer Authenticator to KerberosWrapper
1121         */
1122         krb5_app_req.length = 0;
1123         if (authenp)
1124                 {
1125                 krb5_data       krb5in_data;
1126                 unsigned char   *p;
1127                 long            arlen;
1128                 KRB5_APREQBODY  *ap_req;
1129
1130                 authenp->length = 0;
1131                 krb5in_data.data = NULL;
1132                 krb5in_data.length = 0;
1133                 if ((krb5rc = krb5_mk_req_extended(krb5context,
1134                         &krb5auth_context, 0, &krb5in_data, krb5credsp,
1135                         &krb5_app_req)) != 0)
1136                         {
1137                         kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1138                                 "krb5_mk_req_extended() fails.\n");
1139                         goto err;
1140                         }
1141
1142                 arlen = krb5_app_req.length;
1143                 p = (unsigned char *)krb5_app_req.data;
1144                 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
1145                 if (ap_req)
1146                         {
1147                         authenp->length = i2d_KRB5_ENCDATA(
1148                                         ap_req->authenticator, NULL);
1149                         if (authenp->length  &&
1150                                 (authenp->data = malloc(authenp->length)))
1151                                 {
1152                                 unsigned char   *adp = (unsigned char *)authenp->data;
1153                                 authenp->length = i2d_KRB5_ENCDATA(
1154                                                 ap_req->authenticator, &adp);
1155                                 }
1156                         }
1157
1158                 if (ap_req)  KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1159                 if (krb5_app_req.length)
1160                         kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1161                 }
1162 #ifdef KRB5_HEIMDAL
1163         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1164                 {
1165                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1166                         "kssl_ctx_setkey() fails.\n");
1167                 }
1168 #else
1169         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1170                 {
1171                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1172                         "kssl_ctx_setkey() fails.\n");
1173                 }
1174 #endif
1175         else    krb5rc = 0;
1176
1177  err:
1178 #ifdef KSSL_DEBUG
1179         kssl_ctx_show(kssl_ctx);
1180 #endif  /* KSSL_DEBUG */
1181
1182         if (krb5creds.client)   krb5_free_principal(krb5context,
1183                                                         krb5creds.client);
1184         if (krb5creds.server)   krb5_free_principal(krb5context,
1185                                                         krb5creds.server);
1186         if (krb5auth_context)   krb5_auth_con_free(krb5context,
1187                                                         krb5auth_context);
1188         if (krb5context)        krb5_free_context(krb5context);
1189         return (krb5rc);
1190         }
1191
1192
1193 /*  Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1194 **  Return Kerberos error code and kssl_err struct on error.
1195 **  Allocates krb5_ticket and krb5_principal; caller should free these.
1196 **
1197 **      20010410        VRS     Implemented krb5_decode_ticket() as
1198 **                              old_krb5_decode_ticket(). Missing from MIT1.0.6.
1199 **      20010615        VRS     Re-cast as openssl/asn1 d2i_*() functions.
1200 **                              Re-used some of the old krb5_decode_ticket()
1201 **                              code here.  This tkt should alloc/free just
1202 **                              like the real thing.
1203 */
1204 krb5_error_code
1205 kssl_TKT2tkt(   /* IN     */    krb5_context    krb5context,
1206                 /* IN     */    KRB5_TKTBODY    *asn1ticket,
1207                 /* OUT    */    krb5_ticket     **krb5ticket,
1208                 /* OUT    */    KSSL_ERR *kssl_err  )
1209         {
1210         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1211         krb5_ticket                     *new5ticket = NULL;
1212         ASN1_GENERALSTRING              *gstr_svc, *gstr_host;
1213
1214         *krb5ticket = NULL;
1215
1216         if (asn1ticket == NULL  ||  asn1ticket->realm == NULL  ||
1217                 asn1ticket->sname == NULL  ||
1218                 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2)
1219                 {
1220                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1221                         "Null field in asn1ticket.\n");
1222                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1223                 return KRB5KRB_ERR_GENERIC;
1224                 }
1225
1226         if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
1227                 {
1228                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1229                         "Unable to allocate new krb5_ticket.\n");
1230                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1231                 return ENOMEM;          /*  or  KRB5KRB_ERR_GENERIC;    */
1232                 }
1233
1234         gstr_svc  = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0);
1235         gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1);
1236
1237         if ((krb5rc = kssl_build_principal_2(krb5context,
1238                         &new5ticket->server,
1239                         asn1ticket->realm->length, (char *)asn1ticket->realm->data,
1240                         gstr_svc->length,  (char *)gstr_svc->data,
1241                         gstr_host->length, (char *)gstr_host->data)) != 0)
1242                 {
1243                 free(new5ticket);
1244                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1245                         "Error building ticket server principal.\n");
1246                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1247                 return krb5rc;          /*  or  KRB5KRB_ERR_GENERIC;    */
1248                 }
1249
1250         krb5_princ_type(krb5context, new5ticket->server) =
1251                         asn1ticket->sname->nametype->data[0];
1252         new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1253         new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1254         new5ticket->enc_part.ciphertext.length =
1255                         asn1ticket->encdata->cipher->length;
1256         if ((new5ticket->enc_part.ciphertext.data =
1257                 calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
1258                 {
1259                 free(new5ticket);
1260                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1261                         "Error allocating cipher in krb5ticket.\n");
1262                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1263                 return KRB5KRB_ERR_GENERIC;
1264                 }
1265         else
1266                 {
1267                 memcpy(new5ticket->enc_part.ciphertext.data,
1268                         asn1ticket->encdata->cipher->data,
1269                         asn1ticket->encdata->cipher->length);
1270                 }
1271
1272         *krb5ticket = new5ticket;
1273         return 0;
1274         }
1275
1276
1277 /*      Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1278 **              and krb5 AP_REQ message & message length,
1279 **      Return Kerberos session key and client principle
1280 **              to SSL Server in KSSL_CTX *kssl_ctx.
1281 **
1282 **      19990702        VRS     Started.
1283 */
1284 krb5_error_code
1285 kssl_sget_tkt(  /* UPDATE */    KSSL_CTX                *kssl_ctx,
1286                 /* IN     */    krb5_data               *indata,
1287                 /* OUT    */    krb5_ticket_times       *ttimes,
1288                 /* OUT    */    KSSL_ERR                *kssl_err  )
1289         {
1290         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1291         static krb5_context             krb5context = NULL;
1292         static krb5_auth_context        krb5auth_context = NULL;
1293         krb5_ticket                     *krb5ticket = NULL;
1294         KRB5_TKTBODY                    *asn1ticket = NULL;
1295         unsigned char                   *p;
1296         krb5_keytab                     krb5keytab = NULL;
1297         krb5_keytab_entry               kt_entry;
1298         krb5_principal                  krb5server;
1299         krb5_rcache                     rcache = NULL;
1300
1301         kssl_err_set(kssl_err, 0, "");
1302
1303         if (!kssl_ctx)
1304                 {
1305                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1306                         "No kssl_ctx defined.\n");
1307                 goto err;
1308                 }
1309
1310 #ifdef KSSL_DEBUG
1311         printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
1312 #endif  /* KSSL_DEBUG */
1313
1314         if (!krb5context  &&  (krb5rc = krb5_init_context(&krb5context)))
1315                 {
1316                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1317                         "krb5_init_context() fails.\n");
1318                 goto err;
1319                 }
1320         if (krb5auth_context  &&
1321                 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
1322                 {
1323                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1324                         "krb5_auth_con_free() fails.\n");
1325                 goto err;
1326                 }
1327         else  krb5auth_context = NULL;
1328         if (!krb5auth_context  &&
1329                 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
1330                 {
1331                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1332                         "krb5_auth_con_init() fails.\n");
1333                 goto err;
1334                 }
1335
1336
1337         if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1338                 &rcache)))
1339                 {
1340                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1341                         "krb5_auth_con_getrcache() fails.\n");
1342                 goto err;
1343                 }
1344
1345         if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1346                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1347                 KRB5_NT_SRV_HST, &krb5server)) != 0)
1348                 {
1349                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1350                         "krb5_sname_to_principal() fails.\n");
1351                 goto err;
1352                 }
1353
1354         if (rcache == NULL)
1355                 {
1356                 if ((krb5rc = krb5_get_server_rcache(krb5context,
1357                         krb5_princ_component(krb5context, krb5server, 0),
1358                         &rcache)))
1359                         {
1360                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1361                                 "krb5_get_server_rcache() fails.\n");
1362                         goto err;
1363                         }
1364                 }
1365
1366         if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
1367                 {
1368                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1369                         "krb5_auth_con_setrcache() fails.\n");
1370                 goto err;
1371                 }
1372
1373
1374         /*      kssl_ctx->keytab_file == NULL ==> use Kerberos default
1375         */
1376         if (kssl_ctx->keytab_file)
1377                 {
1378                 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1379                         &krb5keytab);
1380                 if (krb5rc)
1381                         {
1382                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1383                                 "krb5_kt_resolve() fails.\n");
1384                         goto err;
1385                         }
1386                 }
1387         else
1388                 {
1389                 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1390                 if (krb5rc)
1391                         {
1392                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1393                                 "krb5_kt_default() fails.\n");
1394                         goto err;
1395                         }
1396                 }
1397
1398         /*      Actual Kerberos5 krb5_recvauth() has initial conversation here
1399         **      o       check KRB5_SENDAUTH_BADAUTHVERS
1400         **              unless KRB5_RECVAUTH_SKIP_VERSION
1401         **      o       check KRB5_SENDAUTH_BADAPPLVERS
1402         **      o       send "0" msg if all OK
1403         */
1404
1405         /*  20010411 was using AP_REQ instead of true KerberosWrapper
1406         **
1407         **  if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1408         **                      &krb5in_data, krb5server, krb5keytab,
1409         **                      &ap_option, &krb5ticket)) != 0)  { Error }
1410         */
1411
1412         p = (unsigned char *)indata->data;
1413         if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
1414                                                 (long) indata->length)) == NULL)
1415                 {
1416                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1417                         "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1418                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1419                 goto err;
1420                 }
1421
1422         /* Was:  krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
1423         if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1424                                         kssl_err)) != 0)
1425                 {
1426                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1427                         "Error converting ASN.1 ticket to krb5_ticket.\n");
1428                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1429                 goto err;
1430                 }
1431
1432         if (! krb5_principal_compare(krb5context, krb5server,
1433                                                   krb5ticket->server))  {
1434                 krb5rc = KRB5_PRINC_NOMATCH;
1435                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1436                         "server principal != ticket principal\n");
1437                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1438                 goto err;
1439                 }
1440         if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1441                         krb5ticket->server, krb5ticket->enc_part.kvno,
1442                         krb5ticket->enc_part.enctype, &kt_entry)) != 0)  {
1443                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1444                         "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1445                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1446                 goto err;
1447                 }
1448         if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1449                         krb5ticket)) != 0)  {
1450                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1451                         "krb5_decrypt_tkt_part() failed.\n");
1452                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1453                 goto err;
1454                 }
1455         else  {
1456                 krb5_kt_free_entry(krb5context, &kt_entry);
1457 #ifdef KSSL_DEBUG
1458                 {
1459                 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1460                 printf("Decrypted ticket fields:\n");
1461                 printf("\tflags: %X, transit-type: %X",
1462                         krb5ticket->enc_part2->flags,
1463                         krb5ticket->enc_part2->transited.tr_type);
1464                 print_krb5_data("\ttransit-data: ",
1465                         &(krb5ticket->enc_part2->transited.tr_contents));
1466                 printf("\tcaddrs: %p, authdata: %p\n",
1467                         krb5ticket->enc_part2->caddrs,
1468                         krb5ticket->enc_part2->authorization_data);
1469                 if (paddr)
1470                         {
1471                         printf("\tcaddrs:\n");
1472                         for (i=0; paddr[i] != NULL; i++)
1473                                 {
1474                                 krb5_data d;
1475                                 d.length=paddr[i]->length;
1476                                 d.data=paddr[i]->contents;
1477                                 print_krb5_data("\t\tIP: ", &d);
1478                                 }
1479                         }
1480                 printf("\tstart/auth/end times: %d / %d / %d\n",
1481                         krb5ticket->enc_part2->times.starttime,
1482                         krb5ticket->enc_part2->times.authtime,
1483                         krb5ticket->enc_part2->times.endtime);
1484                 }
1485 #endif  /* KSSL_DEBUG */
1486                 }
1487
1488         krb5rc = KRB5_NO_TKT_SUPPLIED;
1489         if (!krb5ticket  ||     !krb5ticket->enc_part2  ||
1490                 !krb5ticket->enc_part2->client  ||
1491                 !krb5ticket->enc_part2->client->data  ||
1492                 !krb5ticket->enc_part2->session)
1493                 {
1494                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1495                         "bad ticket from krb5_rd_req.\n");
1496                 }
1497         else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1498                 &krb5ticket->enc_part2->client->realm,
1499                 krb5ticket->enc_part2->client->data))
1500                 {
1501                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1502                         "kssl_ctx_setprinc() fails.\n");
1503                 }
1504         else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
1505                 {
1506                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1507                         "kssl_ctx_setkey() fails.\n");
1508                 }
1509         else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
1510                 {
1511                 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1512                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1513                         "invalid ticket from krb5_rd_req.\n");
1514                 }
1515         else    krb5rc = 0;
1516
1517         kssl_ctx->enctype       = krb5ticket->enc_part.enctype;
1518         ttimes->authtime        = krb5ticket->enc_part2->times.authtime;
1519         ttimes->starttime       = krb5ticket->enc_part2->times.starttime;
1520         ttimes->endtime         = krb5ticket->enc_part2->times.endtime;
1521         ttimes->renew_till      = krb5ticket->enc_part2->times.renew_till;
1522
1523  err:
1524 #ifdef KSSL_DEBUG
1525         kssl_ctx_show(kssl_ctx);
1526 #endif  /* KSSL_DEBUG */
1527
1528         if (asn1ticket)         KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1529         if (krb5keytab)         krb5_kt_close(krb5context, krb5keytab);
1530         if (krb5ticket)         krb5_free_ticket(krb5context, krb5ticket);
1531         if (krb5server)         krb5_free_principal(krb5context, krb5server);
1532         return (krb5rc);
1533         }
1534
1535
1536 /*      Allocate & return a new kssl_ctx struct.
1537 */
1538 KSSL_CTX        *
1539 kssl_ctx_new(void)
1540         {
1541         return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX)));
1542         }
1543
1544
1545 /*      Frees a kssl_ctx struct and any allocated memory it holds.
1546 **      Returns NULL.
1547 */
1548 KSSL_CTX        *
1549 kssl_ctx_free(KSSL_CTX *kssl_ctx)
1550         {
1551         if (kssl_ctx == NULL)  return kssl_ctx;
1552
1553         if (kssl_ctx->key)              OPENSSL_cleanse(kssl_ctx->key,
1554                                                               kssl_ctx->length);
1555         if (kssl_ctx->key)              free(kssl_ctx->key);
1556         if (kssl_ctx->client_princ)     free(kssl_ctx->client_princ);
1557         if (kssl_ctx->service_host)     free(kssl_ctx->service_host);
1558         if (kssl_ctx->service_name)     free(kssl_ctx->service_name);
1559         if (kssl_ctx->keytab_file)      free(kssl_ctx->keytab_file);
1560
1561         free(kssl_ctx);
1562         return (KSSL_CTX *) NULL;
1563         }
1564
1565
1566 /*      Given a (krb5_data *) entity (and optional realm),
1567 **      set the plain (char *) client_princ or service_host member
1568 **      of the kssl_ctx struct.
1569 */
1570 krb5_error_code
1571 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1572         krb5_data *realm, krb5_data *entity)
1573         {
1574         char    **princ;
1575         int     length;
1576
1577         if (kssl_ctx == NULL  ||  entity == NULL)  return KSSL_CTX_ERR;
1578
1579         switch (which)
1580                 {
1581         case KSSL_CLIENT:       princ = &kssl_ctx->client_princ;        break;
1582         case KSSL_SERVER:       princ = &kssl_ctx->service_host;        break;
1583         default:                return KSSL_CTX_ERR;                    break;
1584                 }
1585         if (*princ)  free(*princ);
1586
1587         length = entity->length + ((realm)? realm->length + 2: 1);
1588         if ((*princ = calloc(1, length)) == NULL)
1589                 return KSSL_CTX_ERR;
1590         else
1591                 {
1592                 strncpy(*princ, entity->data, entity->length);
1593                 (*princ)[entity->length]='\0';
1594                 if (realm)
1595                         {
1596                         strcat (*princ, "@");
1597                         (void) strncat(*princ, realm->data, realm->length);
1598                         (*princ)[entity->length+1+realm->length]='\0';
1599                         }
1600                 }
1601
1602         return KSSL_CTX_OK;
1603         }
1604
1605
1606 /*      Set one of the plain (char *) string members of the kssl_ctx struct.
1607 **      Default values should be:
1608 **              which == KSSL_SERVICE   =>      "khost" (KRB5SVC)
1609 **              which == KSSL_KEYTAB    =>      "/etc/krb5.keytab" (KRB5KEYTAB)
1610 */
1611 krb5_error_code
1612 kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1613         {
1614         char    **string;
1615
1616         if (!kssl_ctx)  return KSSL_CTX_ERR;
1617
1618         switch (which)
1619                 {
1620         case KSSL_SERVICE:      string = &kssl_ctx->service_name;       break;
1621         case KSSL_SERVER:       string = &kssl_ctx->service_host;       break;
1622         case KSSL_CLIENT:       string = &kssl_ctx->client_princ;       break;
1623         case KSSL_KEYTAB:       string = &kssl_ctx->keytab_file;        break;
1624         default:                return KSSL_CTX_ERR;                    break;
1625                 }
1626         if (*string)  free(*string);
1627
1628         if (!text)
1629                 {
1630                 *string = '\0';
1631                 return KSSL_CTX_OK;
1632                 }
1633
1634         if ((*string = calloc(1, strlen(text) + 1)) == NULL)
1635                 return KSSL_CTX_ERR;
1636         else
1637                 strcpy(*string, text);
1638
1639         return KSSL_CTX_OK;
1640         }
1641
1642
1643 /*      Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1644 **      struct.  Clear kssl_ctx->key if Kerberos session key is NULL.
1645 */
1646 krb5_error_code
1647 kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1648         {
1649         int             length;
1650         krb5_enctype    enctype;
1651         krb5_octet FAR  *contents = NULL;
1652
1653         if (!kssl_ctx)  return KSSL_CTX_ERR;
1654
1655         if (kssl_ctx->key)
1656                 {
1657                 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
1658                 free(kssl_ctx->key);
1659                 }
1660
1661         if (session)
1662                 {
1663
1664 #ifdef KRB5_HEIMDAL
1665                 length = session->keyvalue->length;
1666                 enctype = session->keytype;
1667                 contents = session->keyvalue->contents;
1668 #else
1669                 length = session->length;
1670                 enctype = session->enctype;
1671                 contents = session->contents;
1672 #endif
1673                 kssl_ctx->enctype = enctype;
1674                 kssl_ctx->length  = length;
1675                 }
1676         else
1677                 {
1678                 kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1679                 kssl_ctx->length  = 0;
1680                 return KSSL_CTX_OK;
1681                 }
1682
1683         if ((kssl_ctx->key =
1684                 (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL)
1685                 {
1686                 kssl_ctx->length  = 0;
1687                 return KSSL_CTX_ERR;
1688                 }
1689         else
1690                 memcpy(kssl_ctx->key, contents, length);
1691
1692         return KSSL_CTX_OK;
1693         }
1694
1695
1696 /*      Display contents of kssl_ctx struct
1697 */
1698 void
1699 kssl_ctx_show(KSSL_CTX *kssl_ctx)
1700         {
1701         int     i;
1702
1703         printf("kssl_ctx: ");
1704         if (kssl_ctx == NULL)
1705                 {
1706                 printf("NULL\n");
1707                 return;
1708                 }
1709         else
1710                 printf("%p\n", kssl_ctx);
1711
1712         printf("\tservice:\t%s\n",
1713                 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
1714         printf("\tclient:\t%s\n",
1715                 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
1716         printf("\tserver:\t%s\n",
1717                 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
1718         printf("\tkeytab:\t%s\n",
1719                 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
1720         printf("\tkey [%d:%d]:\t",
1721                 kssl_ctx->enctype, kssl_ctx->length);
1722
1723         for (i=0; i < kssl_ctx->length  &&  kssl_ctx->key; i++)
1724                 {
1725                 printf("%02x", kssl_ctx->key[i]);
1726                 }
1727         printf("\n");
1728         return;
1729         }
1730
1731     int
1732     kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1733 {
1734     krb5_context                krb5context = NULL;
1735     krb5_keytab                 krb5keytab = NULL;
1736     krb5_keytab_entry           entry;
1737     krb5_principal              princ = NULL;
1738     krb5_error_code             krb5rc = KRB5KRB_ERR_GENERIC;
1739     int rc = 0;
1740
1741     if ((krb5rc = krb5_init_context(&krb5context)))
1742         return(0);
1743
1744     /*  kssl_ctx->keytab_file == NULL ==> use Kerberos default
1745     */
1746     if (kssl_ctx->keytab_file)
1747     {
1748         krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1749                                   &krb5keytab);
1750         if (krb5rc)
1751             goto exit;
1752     }
1753     else
1754     {
1755         krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1756         if (krb5rc)
1757             goto exit;
1758     }
1759
1760     /* the host key we are looking for */
1761     krb5rc = krb5_sname_to_principal(krb5context, NULL,
1762                                      kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
1763                                      KRB5_NT_SRV_HST, &princ);
1764
1765     krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1766                                 princ,
1767                                 0 /* IGNORE_VNO */,
1768                                 0 /* IGNORE_ENCTYPE */,
1769                                 &entry);
1770     if ( krb5rc == KRB5_KT_NOTFOUND ) {
1771         rc = 1;
1772         goto exit;
1773     } else if ( krb5rc )
1774         goto exit;
1775
1776     krb5_kt_free_entry(krb5context, &entry);
1777     rc = 1;
1778
1779   exit:
1780     if (krb5keytab)     krb5_kt_close(krb5context, krb5keytab);
1781     if (princ)          krb5_free_principal(krb5context, princ);
1782     if (krb5context)    krb5_free_context(krb5context);
1783     return(rc);
1784 }
1785
1786 int
1787 kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1788         {
1789         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1790         krb5_context            krb5context = NULL;
1791         krb5_ccache             krb5ccdef = NULL;
1792         krb5_creds              krb5creds, *krb5credsp = NULL;
1793         int                     rc = 0;
1794
1795         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1796
1797         if (!kssl_ctx)
1798             return(0);
1799
1800         if (!kssl_ctx->service_host)
1801             return(0);
1802
1803         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1804             goto err;
1805
1806         if ((krb5rc = krb5_sname_to_principal(krb5context,
1807                                               kssl_ctx->service_host,
1808                                               (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1809                                               KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1810             goto err;
1811
1812         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1813             goto err;
1814
1815         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1816                                              &krb5creds.client)) != 0)
1817             goto err;
1818
1819         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1820                                             &krb5creds, &krb5credsp)) != 0)
1821             goto err;
1822
1823         rc = 1;
1824
1825       err:
1826 #ifdef KSSL_DEBUG
1827         kssl_ctx_show(kssl_ctx);
1828 #endif  /* KSSL_DEBUG */
1829
1830         if (krb5creds.client)   krb5_free_principal(krb5context, krb5creds.client);
1831         if (krb5creds.server)   krb5_free_principal(krb5context, krb5creds.server);
1832         if (krb5context)        krb5_free_context(krb5context);
1833         return(rc);
1834         }
1835
1836 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1837 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1838         {
1839 #ifdef KRB5_HEIMDAL
1840         data->length = 0;
1841         if (data->data)
1842             free(data->data);
1843 #elif defined(KRB5_MIT_OLD11)
1844         if (data->data)  {
1845                 krb5_xfree(data->data);
1846                 data->data = 0;
1847                 }
1848 #else
1849         krb5_free_data_contents(NULL, data);
1850 #endif
1851         }
1852 #endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1853
1854
1855 /*  Given pointers to KerberosTime and struct tm structs, convert the
1856 **  KerberosTime string to struct tm.  Note that KerberosTime is a
1857 **  ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional
1858 **  seconds as defined in RFC 1510.
1859 **  Return pointer to the (partially) filled in struct tm on success,
1860 **  return NULL on failure.
1861 */
1862 struct tm       *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
1863         {
1864         char            c, *p;
1865
1866         if (!k_tm)  return NULL;
1867         if (gtime == NULL  ||  gtime->length < 14)  return NULL;
1868         if (gtime->data == NULL)  return NULL;
1869
1870         p = (char *)&gtime->data[14];
1871
1872         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_sec  = atoi(p);      *(p+2) = c;
1873         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_min  = atoi(p);      *(p+2) = c;
1874         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_hour = atoi(p);      *(p+2) = c;
1875         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mday = atoi(p);      *(p+2) = c;
1876         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mon  = atoi(p)-1;    *(p+2) = c;
1877         c = *p;  *p = '\0';  p -= 4;  k_tm->tm_year = atoi(p)-1900; *(p+4) = c;
1878
1879         return k_tm;
1880         }
1881
1882
1883 /*  Helper function for kssl_validate_times().
1884 **  We need context->clockskew, but krb5_context is an opaque struct.
1885 **  So we try to sneek the clockskew out through the replay cache.
1886 **      If that fails just return a likely default (300 seconds).
1887 */
1888 krb5_deltat     get_rc_clockskew(krb5_context context)
1889         {
1890         krb5_rcache     rc;
1891         krb5_deltat     clockskew;
1892
1893         if (krb5_rc_default(context, &rc))  return KSSL_CLOCKSKEW;
1894         if (krb5_rc_initialize(context, rc, 0))  return KSSL_CLOCKSKEW;
1895         if (krb5_rc_get_lifespan(context, rc, &clockskew))  {
1896                 clockskew = KSSL_CLOCKSKEW;
1897                 }
1898         (void) krb5_rc_destroy(context, rc);
1899         return clockskew;
1900         }
1901
1902
1903 /*  kssl_validate_times() combines (and more importantly exposes)
1904 **  the MIT KRB5 internal function krb5_validate_times() and the
1905 **  in_clock_skew() macro.  The authenticator client time is checked
1906 **  to be within clockskew secs of the current time and the current
1907 **  time is checked to be within the ticket start and expire times.
1908 **  Either check may be omitted by supplying a NULL value.
1909 **  Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
1910 **  See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
1911 **  20010420 VRS
1912 */
1913 krb5_error_code  kssl_validate_times(   krb5_timestamp atime,
1914                                         krb5_ticket_times *ttimes)
1915         {
1916         krb5_deltat     skew;
1917         krb5_timestamp  start, now;
1918         krb5_error_code rc;
1919         krb5_context    context;
1920
1921         if ((rc = krb5_init_context(&context)))  return SSL_R_KRB5_S_BAD_TICKET;
1922         skew = get_rc_clockskew(context);
1923         if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
1924         krb5_free_context(context);
1925
1926         if (atime  &&  labs(atime - now) >= skew)  return SSL_R_KRB5_S_TKT_SKEW;
1927
1928         if (! ttimes)  return 0;
1929
1930         start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
1931         if (start - now > skew)  return SSL_R_KRB5_S_TKT_NYV;
1932         if ((now - ttimes->endtime) > skew)  return SSL_R_KRB5_S_TKT_EXPIRED;
1933
1934 #ifdef KSSL_DEBUG
1935         printf("kssl_validate_times: %d |<-  | %d - %d | < %d  ->| %d\n",
1936                 start, atime, now, skew, ttimes->endtime);
1937 #endif  /* KSSL_DEBUG */
1938
1939         return 0;
1940         }
1941
1942
1943 /*  Decode and decrypt given DER-encoded authenticator, then pass
1944 **  authenticator ctime back in *atimep (or 0 if time unavailable).
1945 **  Returns krb5_error_code and kssl_err on error.  A NULL
1946 **  authenticator (authentp->length == 0) is not considered an error.
1947 **  Note that kssl_check_authent() makes use of the KRB5 session key;
1948 **  you must call kssl_sget_tkt() to get the key before calling this routine.
1949 */
1950 krb5_error_code  kssl_check_authent(
1951                         /* IN     */    KSSL_CTX        *kssl_ctx,
1952                         /* IN     */    krb5_data       *authentp,
1953                         /* OUT    */    krb5_timestamp  *atimep,
1954                         /* OUT    */    KSSL_ERR        *kssl_err  )
1955         {
1956         krb5_error_code         krb5rc = 0;
1957         KRB5_ENCDATA            *dec_authent = NULL;
1958         KRB5_AUTHENTBODY        *auth = NULL;
1959         krb5_enctype            enctype;
1960         EVP_CIPHER_CTX          ciph_ctx;
1961         const EVP_CIPHER        *enc = NULL;
1962         unsigned char           iv[EVP_MAX_IV_LENGTH];
1963         unsigned char           *p, *unenc_authent;
1964         int                     outl, unencbufsize;
1965         struct tm               tm_time, *tm_l, *tm_g;
1966         time_t                  now, tl, tg, tr, tz_offset;
1967
1968         EVP_CIPHER_CTX_init(&ciph_ctx);
1969         *atimep = 0;
1970         kssl_err_set(kssl_err, 0, "");
1971
1972 #ifndef KRB5CHECKAUTH
1973         authentp = NULL;
1974 #else
1975 #if     KRB5CHECKAUTH == 0
1976         authentp = NULL;
1977 #endif
1978 #endif  /* KRB5CHECKAUTH */
1979
1980         if (authentp == NULL  ||  authentp->length == 0)  return 0;
1981
1982 #ifdef KSSL_DEBUG
1983         {
1984         unsigned int ui;
1985         printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
1986         p = authentp->data;
1987         for (ui=0; ui < authentp->length; ui++)  printf("%02x ",p[ui]);
1988         printf("\n");
1989         }
1990 #endif  /* KSSL_DEBUG */
1991
1992         unencbufsize = 2 * authentp->length;
1993         if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
1994                 {
1995                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1996                         "Unable to allocate authenticator buffer.\n");
1997                 krb5rc = KRB5KRB_ERR_GENERIC;
1998                 goto err;
1999                 }
2000
2001         p = (unsigned char *)authentp->data;
2002         if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
2003                                         (long) authentp->length)) == NULL)
2004                 {
2005                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2006                         "Error decoding authenticator.\n");
2007                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2008                 goto err;
2009                 }
2010
2011         enctype = dec_authent->etype->data[0];  /* should = kssl_ctx->enctype */
2012 #if !defined(KRB5_MIT_OLD11)
2013             switch ( enctype ) {
2014             case ENCTYPE_DES3_CBC_SHA1:         /*    EVP_des_ede3_cbc();  */
2015             case ENCTYPE_DES3_CBC_SHA:
2016             case ENCTYPE_DES3_CBC_RAW:
2017                 krb5rc = 0;                     /* Skip, can't handle derived keys */
2018                 goto err;
2019             }
2020 #endif
2021         enc = kssl_map_enc(enctype);
2022         memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2023
2024         if (enc == NULL)
2025                 {
2026                 /*  Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.
2027                 **  This enctype indicates the authenticator was encrypted
2028                 **  using key-usage derived keys which openssl cannot decrypt.
2029                 */
2030                 goto err;
2031                 }
2032
2033         if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0))
2034                 {
2035                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2036                         "EVP_CipherInit error decrypting authenticator.\n");
2037                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2038                 goto err;
2039                 }
2040         outl = dec_authent->cipher->length;
2041         if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl))
2042                 {
2043                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2044                         "EVP_Cipher error decrypting authenticator.\n");
2045                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2046                 goto err;
2047                 }
2048         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2049
2050 #ifdef KSSL_DEBUG
2051         printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
2052         for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
2053         printf("\n");
2054 #endif  /* KSSL_DEBUG */
2055
2056         if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
2057                 {
2058                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2059                         "confounded by authenticator.\n");
2060                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2061                 goto err;
2062                 }
2063         outl -= p - unenc_authent;
2064
2065         if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
2066                                                           (long) outl))==NULL)
2067                 {
2068                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2069                         "Error decoding authenticator body.\n");
2070                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2071                 goto err;
2072                 }
2073
2074         memset(&tm_time,0,sizeof(struct tm));
2075         if (k_gmtime(auth->ctime, &tm_time)  &&
2076                 ((tr = mktime(&tm_time)) != (time_t)(-1)))
2077                 {
2078                 now  = time(&now);
2079                 tm_l = localtime(&now);         tl = mktime(tm_l);
2080                 tm_g = gmtime(&now);            tg = mktime(tm_g);
2081                 tz_offset = tg - tl;
2082
2083                 *atimep = tr - tz_offset;
2084                 }
2085
2086 #ifdef KSSL_DEBUG
2087         printf("kssl_check_authent: returns %d for client time ", *atimep);
2088         if (auth && auth->ctime && auth->ctime->length && auth->ctime->data)
2089                 printf("%.*s\n", auth->ctime->length, auth->ctime->data);
2090         else    printf("NULL\n");
2091 #endif  /* KSSL_DEBUG */
2092
2093  err:
2094         if (auth)               KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2095         if (dec_authent)        KRB5_ENCDATA_free(dec_authent);
2096         if (unenc_authent)      free(unenc_authent);
2097         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2098         return krb5rc;
2099         }
2100
2101
2102 /*  Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2103 **  because I dont't know how to stub varargs.
2104 **  Returns krb5_error_code == ENOMEM on alloc error, otherwise
2105 **  passes back newly constructed principal, which should be freed by caller.
2106 */
2107 krb5_error_code  kssl_build_principal_2(
2108                         /* UPDATE */    krb5_context    context,
2109                         /* OUT    */    krb5_principal  *princ,
2110                         /* IN     */    int rlen,  const char *realm,
2111                         /* IN     */    int slen,  const char *svc,
2112                         /* IN     */    int hlen,  const char *host)
2113         {
2114         krb5_data               *p_data = NULL;
2115         krb5_principal          new_p = NULL;
2116         char                    *new_r = NULL;
2117
2118         if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL  ||
2119             (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
2120                         == NULL)  goto err;
2121         new_p->length = 2;
2122         new_p->data = p_data;
2123
2124         if ((new_r = calloc(1, rlen + 1)) == NULL)  goto err;
2125         memcpy(new_r, realm, rlen);
2126         krb5_princ_set_realm_length(context, new_p, rlen);
2127         krb5_princ_set_realm_data(context, new_p, new_r);
2128
2129         if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL)  goto err;
2130         memcpy(new_p->data[0].data, svc, slen);
2131         new_p->data[0].length = slen;
2132
2133         if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL)  goto err;
2134         memcpy(new_p->data[1].data, host, hlen);
2135         new_p->data[1].length = hlen;
2136
2137         krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2138         *princ = new_p;
2139         return 0;
2140
2141  err:
2142         if (new_p  &&  new_p[0].data)   free(new_p[0].data);
2143         if (new_p  &&  new_p[1].data)   free(new_p[1].data);
2144         if (new_p)      free(new_p);
2145         if (new_r)      free(new_r);
2146         return ENOMEM;
2147         }
2148
2149
2150 #else /* !OPENSSL_NO_KRB5 */
2151
2152 #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2153 static int dummy=(int)&dummy;
2154 #endif
2155
2156 #endif  /* !OPENSSL_NO_KRB5     */
2157