ssl/kssl.c

   1 /* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */
   2 /* Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project 2000.
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    licensing@OpenSSL.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  *
  52  * This product includes cryptographic software written by Eric Young
  53  * (eay@cryptsoft.com).  This product includes software written by Tim
  54  * Hudson (tjh@cryptsoft.com).
  55  *
  56  */
  57
  58
  59 /*  ssl/kssl.c  --  Routines to support (& debug) Kerberos5 auth for openssl
  60 **
  61 **  19990701    VRS     Started.
  62 **  200011??    Jeffrey Altman, Richard Levitte
  63 **                      Generalized for Heimdal, Newer MIT, & Win32.
  64 **                      Integrated into main OpenSSL 0.9.7 snapshots.
  65 **  20010413    Simon Wilkinson, VRS
  66 **                      Real RFC2712 KerberosWrapper replaces AP_REQ.
  67 */
  68
  69 #include <openssl/opensslconf.h>
  70 #ifndef OPENSSL_NO_KRB5
  71 #define _XOPEN_SOURCE /* glibc2 needs this to declare strptime() */
  72 #include <time.h>
  73 #include <string.h>
  74
  75 #include <openssl/ssl.h>
  76 #include <openssl/evp.h>
  77 #include <openssl/objects.h>
  78 #include <openssl/krb5_asn.h>
  79
  80 /*
  81  * When OpenSSL is built on Windows, we do not want to require that
  82  * the Kerberos DLLs be available in order for the OpenSSL DLLs to
  83  * work.  Therefore, all Kerberos routines are loaded at run time
  84  * and we do not link to a .LIB file.
  85  */
  86
  87 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
  88 /*
  89  * The purpose of the following pre-processor statements is to provide
  90  * compatibility with different releases of MIT Kerberos for Windows.
  91  * All versions up to 1.2 used macros.  But macros do not allow for
  92  * a binary compatible interface for DLLs.  Therefore, all macros are
  93  * being replaced by function calls.  The following code will allow
  94  * an OpenSSL DLL built on Windows to work whether or not the macro
  95  * or function form of the routines are utilized.
  96  */
  97 #ifdef  krb5_cc_get_principal
  98 #define NO_DEF_KRB5_CCACHE
  99 #undef  krb5_cc_get_principal
 100 #endif
 101 #define krb5_cc_get_principal    kssl_krb5_cc_get_principal
 102
 103 #define krb5_free_data_contents  kssl_krb5_free_data_contents
 104 #define krb5_free_context        kssl_krb5_free_context
 105 #define krb5_auth_con_free       kssl_krb5_auth_con_free
 106 #define krb5_free_principal      kssl_krb5_free_principal
 107 #define krb5_mk_req_extended     kssl_krb5_mk_req_extended
 108 #define krb5_get_credentials     kssl_krb5_get_credentials
 109 #define krb5_cc_default          kssl_krb5_cc_default
 110 #define krb5_sname_to_principal  kssl_krb5_sname_to_principal
 111 #define krb5_init_context        kssl_krb5_init_context
 112 #define krb5_free_ticket         kssl_krb5_free_ticket
 113 #define krb5_rd_req              kssl_krb5_rd_req
 114 #define krb5_kt_default          kssl_krb5_kt_default
 115 #define krb5_kt_resolve          kssl_krb5_kt_resolve
 116 #define krb5_auth_con_init       kssl_krb5_auth_con_init
 117
 118 #define krb5_principal_compare   kssl_krb5_principal_compare
 119 /* macro  #define krb5_kt_get_entry        kssl_krb5_kt_get_entry  */
 120 #define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
 121 #define krb5_timeofday           kssl_krb5_timeofday
 122 #define krb5_rc_default           kssl_krb5_rc_default
 123 #define krb5_rc_initialize   kssl_krb5_rc_initialize
 124 #define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
 125 #define krb5_rc_destroy      kssl_krb5_rc_destroy
 126 #define valid_cksumtype      kssl_valid_cksumtype
 127 #define krb5_checksum_size   kssl_krb5_checksum_size
 128 #define krb5_kt_free_entry   kssl_krb5_kt_free_entry
 129 #define krb5_auth_con_setrcache  kssl_krb5_auth_con_setrcache
 130 #define krb5_auth_con_getrcache  kssl_krb5_auth_con_getrcache
 131 #define krb5_get_server_rcache   kssl_krb5_get_server_rcache
 132
 133 /* Prototypes for built in stubs */
 134 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
 135 void kssl_krb5_free_principal(krb5_context, krb5_principal );
 136 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
 137                                      krb5_const char *,
 138                                      krb5_keytab *);
 139 krb5_error_code kssl_krb5_kt_default(krb5_context,
 140                                      krb5_keytab *);
 141 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
 142 krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *,
 143                                  krb5_const krb5_data *,
 144                                  krb5_const_principal, krb5_keytab,
 145                                  krb5_flags *,krb5_ticket **);
 146
 147 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
 148                                          krb5_const_principal);
 149 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
 150                                           krb5_auth_context  *,
 151                                           krb5_const krb5_flags,
 152                                           krb5_data  *,
 153                                           krb5_creds  *,
 154                                           krb5_data  * );
 155 krb5_error_code kssl_krb5_init_context(krb5_context *);
 156 void kssl_krb5_free_context(krb5_context);
 157 krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache  *);
 158 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
 159                                              krb5_const char  *,
 160                                              krb5_const char  *,
 161                                              krb5_int32,
 162                                              krb5_principal  *);
 163 krb5_error_code kssl_krb5_get_credentials(krb5_context,
 164                                           krb5_const krb5_flags,
 165                                           krb5_ccache,
 166                                           krb5_creds  *,
 167                                           krb5_creds  *  *);
 168 krb5_error_code kssl_krb5_auth_con_init(krb5_context,
 169                                         krb5_auth_context  *);
 170 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context,
 171                                            krb5_ccache cache,
 172                                            krb5_principal *principal);
 173 krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
 174 size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
 175 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
 176 krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
 177 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context,
 178                                              krb5_auth_context,
 179                                              krb5_rcache);
 180 krb5_error_code kssl_krb5_get_server_rcache(krb5_context,
 181                                             krb5_const krb5_data *,
 182                                             krb5_rcache *);
 183 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context,
 184                                              krb5_auth_context,
 185                                              krb5_rcache *);
 186
 187 /* Function pointers (almost all Kerberos functions are _stdcall) */
 188 static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
 189         =NULL;
 190 static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
 191         =NULL;
 192 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
 193                         (krb5_context, krb5_const char *, krb5_keytab *)=NULL;
 194 static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
 195                                                      krb5_keytab *)=NULL;
 196 static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context,
 197                                                       krb5_ticket *)=NULL;
 198 static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context,
 199                                                  krb5_auth_context *,
 200                                                  krb5_const krb5_data *,
 201                                                  krb5_const_principal,
 202                                                  krb5_keytab, krb5_flags *,
 203                                                  krb5_ticket **)=NULL;
 204 static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
 205                         (krb5_context, krb5_auth_context *,
 206                          krb5_const krb5_flags, krb5_data *, krb5_creds *,
 207                          krb5_data * )=NULL;
 208 static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
 209 static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
 210 static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
 211                                                      krb5_ccache  *)=NULL;
 212 static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
 213                         (krb5_context, krb5_const char *, krb5_const char *,
 214                          krb5_int32, krb5_principal *)=NULL;
 215 static krb5_error_code (_stdcall *p_krb5_get_credentials)
 216                         (krb5_context, krb5_const krb5_flags, krb5_ccache,
 217                          krb5_creds *, krb5_creds **)=NULL;
 218 static krb5_error_code (_stdcall *p_krb5_auth_con_init)
 219                         (krb5_context, krb5_auth_context *)=NULL;
 220 static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
 221                         (krb5_context context, krb5_ccache cache,
 222                          krb5_principal *principal)=NULL;
 223 static krb5_error_code (_stdcall *p_krb5_auth_con_free)
 224                         (krb5_context, krb5_auth_context)=NULL;
 225 static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
 226                         (krb5_context, krb5_const krb5_keyblock *,
 227                                            krb5_ticket *)=NULL;
 228 static krb5_error_code (_stdcall *p_krb5_timeofday)
 229                         (krb5_context context, krb5_int32 *timeret)=NULL;
 230 static krb5_error_code (_stdcall *p_krb5_rc_default)
 231                         (krb5_context context, krb5_rcache *rc)=NULL;
 232 static krb5_error_code (_stdcall *p_krb5_rc_initialize)
 233                         (krb5_context context, krb5_rcache rc,
 234                                      krb5_deltat lifespan)=NULL;
 235 static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
 236                         (krb5_context context, krb5_rcache rc,
 237                                        krb5_deltat *lifespan)=NULL;
 238 static krb5_error_code (_stdcall *p_krb5_rc_destroy)
 239                         (krb5_context context, krb5_rcache rc)=NULL;
 240 static krb5_boolean (_stdcall *p_krb5_principal_compare)
 241                      (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
 242 static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
 243 static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
 244 static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
 245                         (krb5_context,krb5_keytab_entry * )=NULL;
 246 static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context,
 247                                                                krb5_auth_context,
 248                                                                krb5_rcache)=NULL;
 249 static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context,
 250                                                               krb5_const krb5_data *,
 251                                                               krb5_rcache *)=NULL;
 252 static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context,
 253                                                       krb5_auth_context,
 254                                                       krb5_rcache *)=NULL;
 255 static int krb5_loaded = 0;     /* only attempt to initialize func ptrs once */
 256
 257 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
 258 void
 259 load_krb5_dll(void)
 260         {
 261         HANDLE hKRB5_32;
 262
 263         krb5_loaded++;
 264         hKRB5_32 = LoadLibrary("KRB5_32");
 265         if (!hKRB5_32)
 266                 return;
 267
 268         (FARPROC) p_krb5_free_data_contents =
 269                 GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
 270         (FARPROC) p_krb5_free_context =
 271                 GetProcAddress( hKRB5_32, "krb5_free_context" );
 272         (FARPROC) p_krb5_auth_con_free =
 273                 GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
 274         (FARPROC) p_krb5_free_principal =
 275                 GetProcAddress( hKRB5_32, "krb5_free_principal" );
 276         (FARPROC) p_krb5_mk_req_extended =
 277                 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
 278         (FARPROC) p_krb5_get_credentials =
 279                 GetProcAddress( hKRB5_32, "krb5_get_credentials" );
 280         (FARPROC) p_krb5_cc_get_principal =
 281                 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
 282         (FARPROC) p_krb5_cc_default =
 283                 GetProcAddress( hKRB5_32, "krb5_cc_default" );
 284         (FARPROC) p_krb5_sname_to_principal =
 285                 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
 286         (FARPROC) p_krb5_init_context =
 287                 GetProcAddress( hKRB5_32, "krb5_init_context" );
 288         (FARPROC) p_krb5_free_ticket =
 289                 GetProcAddress( hKRB5_32, "krb5_free_ticket" );
 290         (FARPROC) p_krb5_rd_req =
 291                 GetProcAddress( hKRB5_32, "krb5_rd_req" );
 292         (FARPROC) p_krb5_principal_compare =
 293                 GetProcAddress( hKRB5_32, "krb5_principal_compare" );
 294         (FARPROC) p_krb5_decrypt_tkt_part =
 295                 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
 296         (FARPROC) p_krb5_timeofday =
 297                 GetProcAddress( hKRB5_32, "krb5_timeofday" );
 298         (FARPROC) p_krb5_rc_default =
 299                 GetProcAddress( hKRB5_32, "krb5_rc_default" );
 300         (FARPROC) p_krb5_rc_initialize =
 301                 GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
 302         (FARPROC) p_krb5_rc_get_lifespan =
 303                 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
 304         (FARPROC) p_krb5_rc_destroy =
 305                 GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
 306         (FARPROC) p_krb5_kt_default =
 307                 GetProcAddress( hKRB5_32, "krb5_kt_default" );
 308         (FARPROC) p_krb5_kt_resolve =
 309                 GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
 310         (FARPROC) p_krb5_auth_con_init =
 311                 GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
 312         (FARPROC) p_valid_cksumtype =
 313                 GetProcAddress( hKRB5_32, "valid_cksumtype" );
 314         (FARPROC) p_krb5_checksum_size =
 315                 GetProcAddress( hKRB5_32, "krb5_checksum_size" );
 316         (FARPROC) p_krb5_kt_free_entry =
 317                 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
 318         (FARPROC) p_krb5_auth_con_setrcache =
 319                 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
 320         (FARPROC) p_krb5_get_server_rcache =
 321                 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
 322         (FARPROC) p_krb5_auth_con_getrcache =
 323                 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
 324         }
 325
 326 /* Stubs for each function to be dynamicly loaded */
 327 void
 328 kssl_krb5_free_data_contents(krb5_context CO, krb5_data  * data)
 329         {
 330         if (!krb5_loaded)
 331                 load_krb5_dll();
 332
 333         if ( p_krb5_free_data_contents )
 334                 p_krb5_free_data_contents(CO,data);
 335         }
 336
 337 krb5_error_code
 338 kssl_krb5_mk_req_extended (krb5_context CO,
 339                           krb5_auth_context  * pACO,
 340                           krb5_const krb5_flags F,
 341                           krb5_data  * pD1,
 342                           krb5_creds  * pC,
 343                           krb5_data  * pD2)
 344         {
 345         if (!krb5_loaded)
 346                 load_krb5_dll();
 347
 348         if ( p_krb5_mk_req_extended )
 349                 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
 350         else
 351                 return KRB5KRB_ERR_GENERIC;
 352         }
 353 krb5_error_code
 354 kssl_krb5_auth_con_init(krb5_context CO,
 355                        krb5_auth_context  * pACO)
 356         {
 357         if (!krb5_loaded)
 358                 load_krb5_dll();
 359
 360         if ( p_krb5_auth_con_init )
 361                 return(p_krb5_auth_con_init(CO,pACO));
 362         else
 363                 return KRB5KRB_ERR_GENERIC;
 364         }
 365 krb5_error_code
 366 kssl_krb5_auth_con_free (krb5_context CO,
 367                         krb5_auth_context ACO)
 368         {
 369         if (!krb5_loaded)
 370                 load_krb5_dll();
 371
 372         if ( p_krb5_auth_con_free )
 373                 return(p_krb5_auth_con_free(CO,ACO));
 374         else
 375                 return KRB5KRB_ERR_GENERIC;
 376         }
 377 krb5_error_code
 378 kssl_krb5_get_credentials(krb5_context CO,
 379                          krb5_const krb5_flags F,
 380                          krb5_ccache CC,
 381                          krb5_creds  * pCR,
 382                          krb5_creds  ** ppCR)
 383         {
 384         if (!krb5_loaded)
 385                 load_krb5_dll();
 386
 387         if ( p_krb5_get_credentials )
 388                 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
 389         else
 390                 return KRB5KRB_ERR_GENERIC;
 391         }
 392 krb5_error_code
 393 kssl_krb5_sname_to_principal(krb5_context CO,
 394                             krb5_const char  * pC1,
 395                             krb5_const char  * pC2,
 396                             krb5_int32 I,
 397                             krb5_principal  * pPR)
 398         {
 399         if (!krb5_loaded)
 400                 load_krb5_dll();
 401
 402         if ( p_krb5_sname_to_principal )
 403                 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
 404         else
 405                 return KRB5KRB_ERR_GENERIC;
 406         }
 407
 408 krb5_error_code
 409 kssl_krb5_cc_default(krb5_context CO,
 410                     krb5_ccache  * pCC)
 411         {
 412         if (!krb5_loaded)
 413                 load_krb5_dll();
 414
 415         if ( p_krb5_cc_default )
 416                 return(p_krb5_cc_default(CO,pCC));
 417         else
 418                 return KRB5KRB_ERR_GENERIC;
 419         }
 420
 421 krb5_error_code
 422 kssl_krb5_init_context(krb5_context * pCO)
 423         {
 424         if (!krb5_loaded)
 425                 load_krb5_dll();
 426
 427         if ( p_krb5_init_context )
 428                 return(p_krb5_init_context(pCO));
 429         else
 430                 return KRB5KRB_ERR_GENERIC;
 431         }
 432
 433 void
 434 kssl_krb5_free_context(krb5_context CO)
 435         {
 436         if (!krb5_loaded)
 437                 load_krb5_dll();
 438
 439         if ( p_krb5_free_context )
 440                 p_krb5_free_context(CO);
 441         }
 442
 443 void
 444 kssl_krb5_free_principal(krb5_context c, krb5_principal p)
 445         {
 446         if (!krb5_loaded)
 447                 load_krb5_dll();
 448
 449         if ( p_krb5_free_principal )
 450                 p_krb5_free_principal(c,p);
 451         }
 452
 453 krb5_error_code
 454 kssl_krb5_kt_resolve(krb5_context con,
 455                     krb5_const char * sz,
 456                     krb5_keytab * kt)
 457         {
 458         if (!krb5_loaded)
 459                 load_krb5_dll();
 460
 461         if ( p_krb5_kt_resolve )
 462                 return(p_krb5_kt_resolve(con,sz,kt));
 463         else
 464                 return KRB5KRB_ERR_GENERIC;
 465         }
 466
 467 krb5_error_code
 468 kssl_krb5_kt_default(krb5_context con,
 469                     krb5_keytab * kt)
 470         {
 471         if (!krb5_loaded)
 472                 load_krb5_dll();
 473
 474         if ( p_krb5_kt_default )
 475                 return(p_krb5_kt_default(con,kt));
 476         else
 477                 return KRB5KRB_ERR_GENERIC;
 478         }
 479
 480 krb5_error_code
 481 kssl_krb5_free_ticket(krb5_context con,
 482                      krb5_ticket * kt)
 483         {
 484         if (!krb5_loaded)
 485                 load_krb5_dll();
 486
 487         if ( p_krb5_free_ticket )
 488                 return(p_krb5_free_ticket(con,kt));
 489         else
 490                 return KRB5KRB_ERR_GENERIC;
 491         }
 492
 493 krb5_error_code
 494 kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
 495                 krb5_const krb5_data * data,
 496                 krb5_const_principal princ, krb5_keytab keytab,
 497                 krb5_flags * flags, krb5_ticket ** pptkt)
 498         {
 499         if (!krb5_loaded)
 500                 load_krb5_dll();
 501
 502         if ( p_krb5_rd_req )
 503                 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
 504         else
 505                 return KRB5KRB_ERR_GENERIC;
 506         }
 507
 508 krb5_boolean
 509 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
 510                 krb5_const_principal princ2)
 511         {
 512         if (!krb5_loaded)
 513                 load_krb5_dll();
 514
 515         if ( p_krb5_principal_compare )
 516                 return(p_krb5_principal_compare(con,princ1,princ2));
 517         else
 518                 return KRB5KRB_ERR_GENERIC;
 519         }
 520
 521 krb5_error_code
 522 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
 523                 krb5_ticket *ticket)
 524         {
 525         if (!krb5_loaded)
 526                 load_krb5_dll();
 527
 528         if ( p_krb5_decrypt_tkt_part )
 529                 return(p_krb5_decrypt_tkt_part(con,keys,ticket));
 530         else
 531                 return KRB5KRB_ERR_GENERIC;
 532         }
 533
 534 krb5_error_code
 535 krb5_timeofday(krb5_context con, krb5_int32 *timeret)
 536         {
 537         if (!krb5_loaded)
 538                 load_krb5_dll();
 539
 540         if ( p_krb5_timeofday )
 541                 return(p_krb5_timeofday(con,timeret));
 542         else
 543                 return KRB5KRB_ERR_GENERIC;
 544         }
 545
 546 krb5_error_code
 547 krb5_rc_default(krb5_context con, krb5_rcache *rc)
 548         {
 549         if (!krb5_loaded)
 550                 load_krb5_dll();
 551
 552         if ( p_krb5_rc_default )
 553                 return(p_krb5_rc_default(con,rc));
 554         else
 555                 return KRB5KRB_ERR_GENERIC;
 556         }
 557
 558 krb5_error_code
 559 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
 560         {
 561         if (!krb5_loaded)
 562                 load_krb5_dll();
 563
 564         if ( p_krb5_rc_initialize )
 565                 return(p_krb5_rc_initialize(con, rc, lifespan));
 566         else
 567                 return KRB5KRB_ERR_GENERIC;
 568         }
 569
 570 krb5_error_code
 571 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
 572         {
 573         if (!krb5_loaded)
 574                 load_krb5_dll();
 575
 576         if ( p_krb5_rc_get_lifespan )
 577                 return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
 578         else
 579                 return KRB5KRB_ERR_GENERIC;
 580         }
 581
 582 krb5_error_code
 583 krb5_rc_destroy(krb5_context con, krb5_rcache rc)
 584         {
 585         if (!krb5_loaded)
 586                 load_krb5_dll();
 587
 588         if ( p_krb5_rc_destroy )
 589                 return(p_krb5_rc_destroy(con, rc));
 590         else
 591                 return KRB5KRB_ERR_GENERIC;
 592         }
 593
 594 size_t
 595 krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
 596         {
 597         if (!krb5_loaded)
 598                 load_krb5_dll();
 599
 600         if ( p_krb5_checksum_size )
 601                 return(p_krb5_checksum_size(context, ctype));
 602         else
 603                 return KRB5KRB_ERR_GENERIC;
 604         }
 605
 606 krb5_boolean
 607 valid_cksumtype(krb5_cksumtype ctype)
 608         {
 609         if (!krb5_loaded)
 610                 load_krb5_dll();
 611
 612         if ( p_valid_cksumtype )
 613                 return(p_valid_cksumtype(ctype));
 614         else
 615                 return KRB5KRB_ERR_GENERIC;
 616         }
 617
 618 krb5_error_code
 619 krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
 620         {
 621         if (!krb5_loaded)
 622                 load_krb5_dll();
 623
 624         if ( p_krb5_kt_free_entry )
 625                 return(p_krb5_kt_free_entry(con,entry));
 626         else
 627                 return KRB5KRB_ERR_GENERIC;
 628         }
 629
 630 /* Structure definitions  */
 631 #ifndef NO_DEF_KRB5_CCACHE
 632 #ifndef krb5_x
 633 #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
 634 #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
 635 #endif
 636
 637 typedef krb5_pointer    krb5_cc_cursor; /* cursor for sequential lookup */
 638
 639 typedef struct _krb5_ccache
 640         {
 641         krb5_magic magic;
 642         struct _krb5_cc_ops FAR *ops;
 643         krb5_pointer data;
 644         } *krb5_ccache;
 645
 646 typedef struct _krb5_cc_ops
 647         {
 648         krb5_magic magic;
 649         char  *prefix;
 650         char  * (KRB5_CALLCONV *get_name)
 651                 (krb5_context, krb5_ccache);
 652         krb5_error_code (KRB5_CALLCONV *resolve)
 653                 (krb5_context, krb5_ccache  *, const char  *);
 654         krb5_error_code (KRB5_CALLCONV *gen_new)
 655                 (krb5_context, krb5_ccache  *);
 656         krb5_error_code (KRB5_CALLCONV *init)
 657                 (krb5_context, krb5_ccache, krb5_principal);
 658         krb5_error_code (KRB5_CALLCONV *destroy)
 659                 (krb5_context, krb5_ccache);
 660         krb5_error_code (KRB5_CALLCONV *close)
 661                 (krb5_context, krb5_ccache);
 662         krb5_error_code (KRB5_CALLCONV *store)
 663                 (krb5_context, krb5_ccache, krb5_creds  *);
 664         krb5_error_code (KRB5_CALLCONV *retrieve)
 665                 (krb5_context, krb5_ccache,
 666                 krb5_flags, krb5_creds  *, krb5_creds  *);
 667         krb5_error_code (KRB5_CALLCONV *get_princ)
 668                 (krb5_context, krb5_ccache, krb5_principal  *);
 669         krb5_error_code (KRB5_CALLCONV *get_first)
 670                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
 671         krb5_error_code (KRB5_CALLCONV *get_next)
 672                 (krb5_context, krb5_ccache,
 673                 krb5_cc_cursor  *, krb5_creds  *);
 674         krb5_error_code (KRB5_CALLCONV *end_get)
 675                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
 676         krb5_error_code (KRB5_CALLCONV *remove_cred)
 677                 (krb5_context, krb5_ccache,
 678                 krb5_flags, krb5_creds  *);
 679         krb5_error_code (KRB5_CALLCONV *set_flags)
 680                 (krb5_context, krb5_ccache, krb5_flags);
 681         } krb5_cc_ops;
 682 #endif /* NO_DEF_KRB5_CCACHE */
 683
 684 krb5_error_code
 685 kssl_krb5_cc_get_principal
 686     (krb5_context context, krb5_ccache cache,
 687       krb5_principal *principal)
 688         {
 689         if ( p_krb5_cc_get_principal )
 690                 return(p_krb5_cc_get_principal(context,cache,principal));
 691         else
 692                 return(krb5_x
 693                         ((cache)->ops->get_princ,(context, cache, principal)));
 694         }
 695
 696 krb5_error_code
 697 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
 698                              krb5_rcache rcache)
 699         {
 700         if ( p_krb5_auth_con_setrcache )
 701                  return(p_krb5_auth_con_setrcache(con,acon,rcache));
 702         else
 703                  return KRB5KRB_ERR_GENERIC;
 704         }
 705
 706 krb5_error_code
 707 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
 708                             krb5_rcache * rcache)
 709         {
 710                  if ( p_krb5_get_server_rcache )
 711                          return(p_krb5_get_server_rcache(con,data,rcache));
 712                  else
 713                          return KRB5KRB_ERR_GENERIC;
 714         }
 715
 716 krb5_error_code
 717 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
 718                              krb5_rcache * prcache)
 719         {
 720                  if ( p_krb5_auth_con_getrcache )
 721                          return(p_krb5_auth_con_getrcache(con,acon, prcache));
 722                  else
 723                          return KRB5KRB_ERR_GENERIC;
 724         }
 725 #endif  /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
 726
 727 char
 728 *kstring(char *string)
 729         {
 730         static char     *null = "[NULL]";
 731
 732         return ((string == NULL)? null: string);
 733         }
 734
 735 #define MAXKNUM 255
 736 char
 737 *knumber(int len, krb5_octet *contents)
 738         {
 739         static char     buf[MAXKNUM+1];
 740         int             i;
 741
 742         BIO_snprintf(buf, MAXKNUM, "[%d] ", len);
 743
 744         for (i=0; i < len  &&  MAXKNUM > strlen(buf)+3; i++)
 745                 {
 746                 BIO_snprintf(&buf[strlen(buf)], 3, "%02x", contents[i]);
 747                 }
 748
 749         return (buf);
 750         }
 751
 752
 753 /*      Given KRB5 enctype (basically DES or 3DES),
 754 **      return closest match openssl EVP_ encryption algorithm.
 755 **      Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes.
 756 **      Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK.
 757 */
 758 EVP_CIPHER *
 759 kssl_map_enc(krb5_enctype enctype)
 760         {
 761         switch (enctype)
 762                 {
 763         case ENCTYPE_DES_HMAC_SHA1:             /*    EVP_des_cbc();       */
 764         case ENCTYPE_DES_CBC_CRC:
 765         case ENCTYPE_DES_CBC_MD4:
 766         case ENCTYPE_DES_CBC_MD5:
 767         case ENCTYPE_DES_CBC_RAW:
 768                                 return (EVP_CIPHER *) EVP_des_cbc();
 769                                 break;
 770         case ENCTYPE_DES3_CBC_SHA1:             /*    EVP_des_ede3_cbc();  */
 771         case ENCTYPE_DES3_CBC_SHA:
 772         case ENCTYPE_DES3_CBC_RAW:
 773                                 return (EVP_CIPHER *) EVP_des_ede3_cbc();
 774                                 break;
 775         default:                return (EVP_CIPHER *) NULL;
 776                                 break;
 777                 }
 778         }
 779
 780
 781 /*      Return true:1 if p "looks like" the start of the real authenticator
 782 **      described in kssl_skip_confound() below.  The ASN.1 pattern is
 783 **      "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
 784 **      xx and yy are possibly multi-byte length fields.
 785 */
 786 int     kssl_test_confound(unsigned char *p)
 787         {
 788         int     len = 2;
 789         int     xx = 0, yy = 0;
 790
 791         if (*p++ != 0x62)  return 0;
 792         if (*p > 0x82)  return 0;
 793         switch(*p)  {
 794                 case 0x82:  p++;          xx = (*p++ << 8);  xx += *p++;  break;
 795                 case 0x81:  p++;          xx =  *p++;  break;
 796                 case 0x80:  return 0;
 797                 default:    xx = *p++;  break;
 798                 }
 799         if (*p++ != 0x30)  return 0;
 800         if (*p > 0x82)  return 0;
 801         switch(*p)  {
 802                 case 0x82:  p++; len+=2;  yy = (*p++ << 8);  yy += *p++;  break;
 803                 case 0x81:  p++; len++;   yy =  *p++;  break;
 804                 case 0x80:  return 0;
 805                 default:    yy = *p++;  break;
 806                 }
 807
 808         return (xx - len == yy)? 1: 0;
 809         }
 810
 811 /*      Allocate, fill, and return cksumlens array of checksum lengths.
 812 **      This array holds just the unique elements from the krb5_cksumarray[].
 813 **      array[n] == 0 signals end of data.
 814 **
 815 **      The krb5_cksumarray[] was an internal variable that has since been
 816 **      replaced by a more general method for storing the data.  It should
 817 **      not be used.  Instead we use real API calls and make a guess for
 818 **      what the highest assigned CKSUMTYPE_ constant is.  As of 1.2.2
 819 **      it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3).  So we will use 0x0010.
 820 */
 821 size_t  *populate_cksumlens(void)
 822         {
 823         int             i, j, n;
 824         static size_t   *cklens = NULL;
 825
 826 #ifdef KRB5_MIT_OLD11
 827         n = krb5_max_cksum;
 828 #else
 829         n = 0x0010;
 830 #endif  /* KRB5_MIT_OLD11 */
 831
 832 #ifdef KRB5CHECKAUTH
 833         if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1)))  return NULL;
 834
 835         for (i=0; i < n; i++)  {
 836                 if (!valid_cksumtype(i))  continue;     /*  array has holes  */
 837                 for (j=0; j < n; j++)  {
 838                         if (cklens[j] == 0)  {
 839                                 cklens[j] = krb5_checksum_size(NULL,i);
 840                                 break;          /*  krb5 elem was new: add   */
 841                                 }
 842                         if (cklens[j] == krb5_checksum_size(NULL,i))  {
 843                                 break;          /*  ignore duplicate elements */
 844                                 }
 845                         }
 846                 }
 847 #endif  /* KRB5CHECKAUTH */
 848
 849         return cklens;
 850         }
 851
 852 /*      Return pointer to start of real authenticator within authenticator, or
 853 **      return NULL on error.
 854 **      Decrypted authenticator looks like this:
 855 **              [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
 856 **      This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
 857 **      krb5_auth_con_getcksumtype() function advertised in its krb5.h.
 858 */
 859 unsigned char   *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
 860         {
 861         int             i, conlen;
 862         size_t          cklen;
 863         static size_t   *cksumlens = NULL;
 864         unsigned char   *test_auth;
 865
 866         conlen = (etype)? 8: 0;
 867
 868         if (!cksumlens  &&  !(cksumlens = populate_cksumlens()))  return NULL;
 869         for (i=0; (cklen = cksumlens[i]) != 0; i++)
 870                 {
 871                 test_auth = a + conlen + cklen;
 872                 if (kssl_test_confound(test_auth))  return test_auth;
 873                 }
 874
 875         return NULL;
 876         }
 877
 878
 879 /*      Set kssl_err error info when reason text is a simple string
 880 **              kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
 881 */
 882 void
 883 kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
 884         {
 885         if (kssl_err == NULL)  return;
 886
 887         kssl_err->reason = reason;
 888         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text);
 889         return;
 890         }
 891
 892
 893 /*      Display contents of krb5_data struct, for debugging
 894 */
 895 void
 896 print_krb5_data(char *label, krb5_data *kdata)
 897         {
 898         unsigned int    i;
 899
 900         printf("%s[%d] ", label, kdata->length);
 901         for (i=0; i < kdata->length; i++)
 902                 {
 903                 if (0 &&  isprint((int) kdata->data[i]))
 904                         printf( "%c ",  kdata->data[i]);
 905                 else
 906                         printf( "%02x ", (unsigned char) kdata->data[i]);
 907                 }
 908         printf("\n");
 909         }
 910
 911
 912 /*      Display contents of krb5_authdata struct, for debugging
 913 */
 914 void
 915 print_krb5_authdata(char *label, krb5_authdata **adata)
 916         {
 917         if (adata == NULL)
 918                 {
 919                 printf("%s, authdata==0\n", label);
 920                 return;
 921                 }
 922         printf("%s [%p]\n", label, adata);
 923 #if 0
 924         {
 925         int     i;
 926         printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
 927         for (i=0; i < adata->length; i++)
 928                 {
 929                 printf((isprint(adata->contents[i]))? "%c ": "%02x",
 930                         adata->contents[i]);
 931                 }
 932         printf("\n");
 933         }
 934 #endif
 935         }
 936
 937
 938 /*      Display contents of krb5_keyblock struct, for debugging
 939 */
 940 void
 941 print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
 942         {
 943         unsigned int    i;
 944
 945         if (keyblk == NULL)
 946                 {
 947                 printf("%s, keyblk==0\n", label);
 948                 return;
 949                 }
 950 #ifdef KRB5_HEIMDAL
 951         printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
 952                                            keyblk->keyvalue->length);
 953         for (i=0; i < keyblk->keyvalue->length; i++)
 954                 {
 955                 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
 956                 }
 957         printf("\n");
 958 #else
 959         printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
 960         for (i=0; i < keyblk->length; i++)
 961                 {
 962                 printf("%02x",keyblk->contents[i]);
 963                 }
 964         printf("\n");
 965 #endif
 966         }
 967
 968
 969 /*      Display contents of krb5_principal_data struct, for debugging
 970 **      (krb5_principal is typedef'd == krb5_principal_data *)
 971 */
 972 void
 973 print_krb5_princ(char *label, krb5_principal_data *princ)
 974         {
 975         unsigned int    ui, uj;
 976         int i;
 977
 978         printf("%s principal Realm: ", label);
 979         if (princ == NULL)  return;
 980         for (ui=0; ui < princ->realm.length; ui++)  putchar(princ->realm.data[ui]);
 981         printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
 982         for (i=0; i < princ->length; i++)
 983                 {
 984                 printf("\t%d [%d]: ", i, princ->data[i].length);
 985                 for (uj=0; uj < princ->data[i].length; uj++)  {
 986                         putchar(princ->data[i].data[uj]);
 987                         }
 988                 printf("\n");
 989                 }
 990         return;
 991         }
 992
 993
 994 /*      Given krb5 service (typically "kssl") and hostname in kssl_ctx,
 995 **      Return encrypted Kerberos ticket for service @ hostname.
 996 **      If authenp is non-NULL, also return encrypted authenticator,
 997 **      whose data should be freed by caller.
 998 **      (Originally was: Create Kerberos AP_REQ message for SSL Client.)
 999 **
1000 **      19990628        VRS     Started; Returns Kerberos AP_REQ message.
1001 **      20010409        VRS     Modified for RFC2712; Returns enc tkt.
1002 **      20010606        VRS     May also return optional authenticator.
1003 */
1004 krb5_error_code
1005 kssl_cget_tkt(  /* UPDATE */    KSSL_CTX *kssl_ctx,
1006                 /* OUT    */    krb5_data **enc_ticketp,
1007                 /* UPDATE */    krb5_data *authenp,
1008                 /* OUT    */    KSSL_ERR *kssl_err)
1009         {
1010         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1011         krb5_context            krb5context = NULL;
1012         krb5_auth_context       krb5auth_context = NULL;
1013         krb5_ccache             krb5ccdef = NULL;
1014         krb5_creds              krb5creds, *krb5credsp = NULL;
1015         krb5_data               krb5_app_req;
1016
1017         kssl_err_set(kssl_err, 0, "");
1018         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1019
1020         if (!kssl_ctx)
1021                 {
1022                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1023                         "No kssl_ctx defined.\n");
1024                 goto err;
1025                 }
1026         else if (!kssl_ctx->service_host)
1027                 {
1028                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1029                         "kssl_ctx service_host undefined.\n");
1030                 goto err;
1031                 }
1032
1033         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1034                 {
1035                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1036                         "krb5_init_context() fails: %d\n", krb5rc);
1037                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1038                 goto err;
1039                 }
1040
1041         if ((krb5rc = krb5_sname_to_principal(krb5context,
1042                 kssl_ctx->service_host,
1043                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1044                 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1045                 {
1046                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1047                         "krb5_sname_to_principal() fails for %s/%s\n",
1048                         kssl_ctx->service_host,
1049                         (kssl_ctx->service_name)? kssl_ctx->service_name:
1050                                                   KRB5SVC);
1051                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1052                 goto err;
1053                 }
1054
1055         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1056                 {
1057                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1058                         "krb5_cc_default fails.\n");
1059                 goto err;
1060                 }
1061
1062         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1063                 &krb5creds.client)) != 0)
1064                 {
1065                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1066                         "krb5_cc_get_principal() fails.\n");
1067                 goto err;
1068                 }
1069
1070         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1071                 &krb5creds, &krb5credsp)) != 0)
1072                 {
1073                 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1074                         "krb5_get_credentials() fails.\n");
1075                 goto err;
1076                 }
1077
1078         *enc_ticketp = &krb5credsp->ticket;
1079 #ifdef KRB5_HEIMDAL
1080         kssl_ctx->enctype = krb5credsp->session.keytype;
1081 #else
1082         kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1083 #endif
1084
1085         krb5rc = KRB5KRB_ERR_GENERIC;
1086         /*      caller should free data of krb5_app_req  */
1087         /*  20010406 VRS deleted for real KerberosWrapper
1088         **  20010605 VRS reinstated to offer Authenticator to KerberosWrapper
1089         */
1090         krb5_app_req.length = 0;
1091         if (authenp)
1092                 {
1093                 krb5_data       krb5in_data;
1094                 unsigned char   *p;
1095                 long            arlen;
1096                 KRB5_APREQBODY  *ap_req;
1097
1098                 authenp->length = 0;
1099                 krb5in_data.data = NULL;
1100                 krb5in_data.length = 0;
1101                 if ((krb5rc = krb5_mk_req_extended(krb5context,
1102                         &krb5auth_context, 0, &krb5in_data, krb5credsp,
1103                         &krb5_app_req)) != 0)
1104                         {
1105                         kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1106                                 "krb5_mk_req_extended() fails.\n");
1107                         goto err;
1108                         }
1109
1110                 arlen = krb5_app_req.length;
1111                 p = (unsigned char *)krb5_app_req.data;
1112                 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
1113                 if (ap_req)
1114                         {
1115                         authenp->length = i2d_KRB5_ENCDATA(
1116                                         ap_req->authenticator, NULL);
1117                         if (authenp->length  &&
1118                                 (authenp->data = malloc(authenp->length)))
1119                                 {
1120                                 unsigned char   *adp = (unsigned char *)authenp->data;
1121                                 authenp->length = i2d_KRB5_ENCDATA(
1122                                                 ap_req->authenticator, &adp);
1123                                 }
1124                         }
1125
1126                 if (ap_req)  KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1127                 if (krb5_app_req.length)
1128                         kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1129                 }
1130 #ifdef KRB5_HEIMDAL
1131         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1132                 {
1133                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1134                         "kssl_ctx_setkey() fails.\n");
1135                 }
1136 #else
1137         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1138                 {
1139                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1140                         "kssl_ctx_setkey() fails.\n");
1141                 }
1142 #endif
1143         else    krb5rc = 0;
1144
1145  err:
1146 #ifdef KSSL_DEBUG
1147         kssl_ctx_show(kssl_ctx);
1148 #endif  /* KSSL_DEBUG */
1149
1150         if (krb5creds.client)   krb5_free_principal(krb5context,
1151                                                         krb5creds.client);
1152         if (krb5creds.server)   krb5_free_principal(krb5context,
1153                                                         krb5creds.server);
1154         if (krb5auth_context)   krb5_auth_con_free(krb5context,
1155                                                         krb5auth_context);
1156         if (krb5context)        krb5_free_context(krb5context);
1157         return (krb5rc);
1158         }
1159
1160
1161 /*  Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1162 **  Return Kerberos error code and kssl_err struct on error.
1163 **  Allocates krb5_ticket and krb5_principal; caller should free these.
1164 **
1165 **      20010410        VRS     Implemented krb5_decode_ticket() as
1166 **                              old_krb5_decode_ticket(). Missing from MIT1.0.6.
1167 **      20010615        VRS     Re-cast as openssl/asn1 d2i_*() functions.
1168 **                              Re-used some of the old krb5_decode_ticket()
1169 **                              code here.  This tkt should alloc/free just
1170 **                              like the real thing.
1171 */
1172 krb5_error_code
1173 kssl_TKT2tkt(   /* IN     */    krb5_context    krb5context,
1174                 /* IN     */    KRB5_TKTBODY    *asn1ticket,
1175                 /* OUT    */    krb5_ticket     **krb5ticket,
1176                 /* OUT    */    KSSL_ERR *kssl_err  )
1177         {
1178         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1179         krb5_ticket                     *new5ticket = NULL;
1180         ASN1_GENERALSTRING              *gstr_svc, *gstr_host;
1181
1182         *krb5ticket = NULL;
1183
1184         if (asn1ticket == NULL  ||  asn1ticket->realm == NULL  ||
1185                 asn1ticket->sname == NULL  ||
1186                 asn1ticket->sname->namestring == NULL  ||
1187                 asn1ticket->sname->namestring->num < 2)
1188                 {
1189                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1190                         "Null field in asn1ticket.\n");
1191                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1192                 return KRB5KRB_ERR_GENERIC;
1193                 }
1194
1195         if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
1196                 {
1197                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1198                         "Unable to allocate new krb5_ticket.\n");
1199                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1200                 return ENOMEM;          /*  or  KRB5KRB_ERR_GENERIC;    */
1201                 }
1202
1203         gstr_svc  = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[0];
1204         gstr_host = (ASN1_GENERALSTRING*)asn1ticket->sname->namestring->data[1];
1205
1206         if ((krb5rc = kssl_build_principal_2(krb5context,
1207                         &new5ticket->server,
1208                         asn1ticket->realm->length, asn1ticket->realm->data,
1209                         gstr_svc->length,  gstr_svc->data,
1210                         gstr_host->length, gstr_host->data)) != 0)
1211                 {
1212                 free(new5ticket);
1213                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1214                         "Error building ticket server principal.\n");
1215                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1216                 return krb5rc;          /*  or  KRB5KRB_ERR_GENERIC;    */
1217                 }
1218
1219         krb5_princ_type(krb5context, new5ticket->server) =
1220                         asn1ticket->sname->nametype->data[0];
1221         new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1222         new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1223         new5ticket->enc_part.ciphertext.length =
1224                         asn1ticket->encdata->cipher->length;
1225         if ((new5ticket->enc_part.ciphertext.data =
1226                 calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
1227                 {
1228                 free(new5ticket);
1229                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1230                         "Error allocating cipher in krb5ticket.\n");
1231                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1232                 return KRB5KRB_ERR_GENERIC;
1233                 }
1234         else
1235                 {
1236                 memcpy(new5ticket->enc_part.ciphertext.data,
1237                         asn1ticket->encdata->cipher->data,
1238                         asn1ticket->encdata->cipher->length);
1239                 }
1240
1241         *krb5ticket = new5ticket;
1242         return 0;
1243         }
1244
1245
1246 /*      Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1247 **              and krb5 AP_REQ message & message length,
1248 **      Return Kerberos session key and client principle
1249 **              to SSL Server in KSSL_CTX *kssl_ctx.
1250 **
1251 **      19990702        VRS     Started.
1252 */
1253 krb5_error_code
1254 kssl_sget_tkt(  /* UPDATE */    KSSL_CTX                *kssl_ctx,
1255                 /* IN     */    krb5_data               *indata,
1256                 /* OUT    */    krb5_ticket_times       *ttimes,
1257                 /* OUT    */    KSSL_ERR                *kssl_err  )
1258         {
1259         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1260         static krb5_context             krb5context = NULL;
1261         static krb5_auth_context        krb5auth_context = NULL;
1262         krb5_ticket                     *krb5ticket = NULL;
1263         KRB5_TKTBODY                    *asn1ticket = NULL;
1264         unsigned char                   *p;
1265         krb5_keytab                     krb5keytab = NULL;
1266         krb5_keytab_entry               kt_entry;
1267         krb5_principal                  krb5server;
1268         krb5_rcache                     rcache = NULL;
1269
1270         kssl_err_set(kssl_err, 0, "");
1271
1272         if (!kssl_ctx)
1273                 {
1274                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1275                         "No kssl_ctx defined.\n");
1276                 goto err;
1277                 }
1278
1279 #ifdef KSSL_DEBUG
1280         printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
1281 #endif  /* KSSL_DEBUG */
1282
1283         if (!krb5context  &&  (krb5rc = krb5_init_context(&krb5context)))
1284                 {
1285                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1286                         "krb5_init_context() fails.\n");
1287                 goto err;
1288                 }
1289         if (krb5auth_context  &&
1290                 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
1291                 {
1292                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1293                         "krb5_auth_con_free() fails.\n");
1294                 goto err;
1295                 }
1296         else  krb5auth_context = NULL;
1297         if (!krb5auth_context  &&
1298                 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
1299                 {
1300                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1301                         "krb5_auth_con_init() fails.\n");
1302                 goto err;
1303                 }
1304
1305
1306         if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1307                 &rcache)))
1308                 {
1309                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1310                         "krb5_auth_con_getrcache() fails.\n");
1311                 goto err;
1312                 }
1313
1314         if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1315                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1316                 KRB5_NT_SRV_HST, &krb5server)) != 0)
1317                 {
1318                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1319                         "krb5_sname_to_principal() fails.\n");
1320                 goto err;
1321                 }
1322
1323         if (rcache == NULL)
1324                 {
1325                 if ((krb5rc = krb5_get_server_rcache(krb5context,
1326                         krb5_princ_component(krb5context, krb5server, 0),
1327                         &rcache)))
1328                         {
1329                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1330                                 "krb5_get_server_rcache() fails.\n");
1331                         goto err;
1332                         }
1333                 }
1334
1335         if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
1336                 {
1337                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1338                         "krb5_auth_con_setrcache() fails.\n");
1339                 goto err;
1340                 }
1341
1342
1343         /*      kssl_ctx->keytab_file == NULL ==> use Kerberos default
1344         */
1345         if (kssl_ctx->keytab_file)
1346                 {
1347                 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1348                         &krb5keytab);
1349                 if (krb5rc)
1350                         {
1351                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1352                                 "krb5_kt_resolve() fails.\n");
1353                         goto err;
1354                         }
1355                 }
1356         else
1357                 {
1358                 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1359                 if (krb5rc)
1360                         {
1361                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1362                                 "krb5_kt_default() fails.\n");
1363                         goto err;
1364                         }
1365                 }
1366
1367         /*      Actual Kerberos5 krb5_recvauth() has initial conversation here
1368         **      o       check KRB5_SENDAUTH_BADAUTHVERS
1369         **              unless KRB5_RECVAUTH_SKIP_VERSION
1370         **      o       check KRB5_SENDAUTH_BADAPPLVERS
1371         **      o       send "0" msg if all OK
1372         */
1373
1374         /*  20010411 was using AP_REQ instead of true KerberosWrapper
1375         **
1376         **  if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1377         **                      &krb5in_data, krb5server, krb5keytab,
1378         **                      &ap_option, &krb5ticket)) != 0)  { Error }
1379         */
1380
1381         p = (unsigned char *)indata->data;
1382         if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
1383                                                 (long) indata->length)) == NULL)
1384                 {
1385                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1386                         "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1387                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1388                 goto err;
1389                 }
1390
1391         /* Was:  krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
1392         if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1393                                         kssl_err)) != 0)
1394                 {
1395                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1396                         "Error converting ASN.1 ticket to krb5_ticket.\n");
1397                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1398                 goto err;
1399                 }
1400
1401         if (! krb5_principal_compare(krb5context, krb5server,
1402                                                   krb5ticket->server))  {
1403                 krb5rc = KRB5_PRINC_NOMATCH;
1404                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1405                         "server principal != ticket principal\n");
1406                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1407                 goto err;
1408                 }
1409         if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1410                         krb5ticket->server, krb5ticket->enc_part.kvno,
1411                         krb5ticket->enc_part.enctype, &kt_entry)) != 0)  {
1412                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1413                         "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1414                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1415                 goto err;
1416                 }
1417         if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1418                         krb5ticket)) != 0)  {
1419                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1420                         "krb5_decrypt_tkt_part() failed.\n");
1421                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1422                 goto err;
1423                 }
1424         else  {
1425                 krb5_kt_free_entry(krb5context, &kt_entry);
1426 #ifdef KSSL_DEBUG
1427                 {
1428                 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1429                 printf("Decrypted ticket fields:\n");
1430                 printf("\tflags: %X, transit-type: %X",
1431                         krb5ticket->enc_part2->flags,
1432                         krb5ticket->enc_part2->transited.tr_type);
1433                 print_krb5_data("\ttransit-data: ",
1434                         &(krb5ticket->enc_part2->transited.tr_contents));
1435                 printf("\tcaddrs: %p, authdata: %p\n",
1436                         krb5ticket->enc_part2->caddrs,
1437                         krb5ticket->enc_part2->authorization_data);
1438                 if (paddr)
1439                         {
1440                         printf("\tcaddrs:\n");
1441                         for (i=0; paddr[i] != NULL; i++)
1442                                 {
1443                                 krb5_data d;
1444                                 d.length=paddr[i]->length;
1445                                 d.data=paddr[i]->contents;
1446                                 print_krb5_data("\t\tIP: ", &d);
1447                                 }
1448                         }
1449                 printf("\tstart/auth/end times: %d / %d / %d\n",
1450                         krb5ticket->enc_part2->times.starttime,
1451                         krb5ticket->enc_part2->times.authtime,
1452                         krb5ticket->enc_part2->times.endtime);
1453                 }
1454 #endif  /* KSSL_DEBUG */
1455                 }
1456
1457         krb5rc = KRB5_NO_TKT_SUPPLIED;
1458         if (!krb5ticket  ||     !krb5ticket->enc_part2  ||
1459                 !krb5ticket->enc_part2->client  ||
1460                 !krb5ticket->enc_part2->client->data  ||
1461                 !krb5ticket->enc_part2->session)
1462                 {
1463                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1464                         "bad ticket from krb5_rd_req.\n");
1465                 }
1466         else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1467                 &krb5ticket->enc_part2->client->realm,
1468                 krb5ticket->enc_part2->client->data))
1469                 {
1470                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1471                         "kssl_ctx_setprinc() fails.\n");
1472                 }
1473         else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
1474                 {
1475                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1476                         "kssl_ctx_setkey() fails.\n");
1477                 }
1478         else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
1479                 {
1480                 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1481                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1482                         "invalid ticket from krb5_rd_req.\n");
1483                 }
1484         else    krb5rc = 0;
1485
1486         kssl_ctx->enctype       = krb5ticket->enc_part.enctype;
1487         ttimes->authtime        = krb5ticket->enc_part2->times.authtime;
1488         ttimes->starttime       = krb5ticket->enc_part2->times.starttime;
1489         ttimes->endtime         = krb5ticket->enc_part2->times.endtime;
1490         ttimes->renew_till      = krb5ticket->enc_part2->times.renew_till;
1491
1492  err:
1493 #ifdef KSSL_DEBUG
1494         kssl_ctx_show(kssl_ctx);
1495 #endif  /* KSSL_DEBUG */
1496
1497         if (asn1ticket)         KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1498         if (krb5keytab)         krb5_kt_close(krb5context, krb5keytab);
1499         if (krb5ticket)         krb5_free_ticket(krb5context, krb5ticket);
1500         if (krb5server)         krb5_free_principal(krb5context, krb5server);
1501         return (krb5rc);
1502         }
1503
1504
1505 /*      Allocate & return a new kssl_ctx struct.
1506 */
1507 KSSL_CTX        *
1508 kssl_ctx_new(void)
1509         {
1510         return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX)));
1511         }
1512
1513
1514 /*      Frees a kssl_ctx struct and any allocated memory it holds.
1515 **      Returns NULL.
1516 */
1517 KSSL_CTX        *
1518 kssl_ctx_free(KSSL_CTX *kssl_ctx)
1519         {
1520         if (kssl_ctx == NULL)  return kssl_ctx;
1521
1522         if (kssl_ctx->key)              memset(kssl_ctx->key, 0,
1523                                                               kssl_ctx->length);
1524         if (kssl_ctx->key)              free(kssl_ctx->key);
1525         if (kssl_ctx->client_princ)     free(kssl_ctx->client_princ);
1526         if (kssl_ctx->service_host)     free(kssl_ctx->service_host);
1527         if (kssl_ctx->service_name)     free(kssl_ctx->service_name);
1528         if (kssl_ctx->keytab_file)      free(kssl_ctx->keytab_file);
1529
1530         free(kssl_ctx);
1531         return (KSSL_CTX *) NULL;
1532         }
1533
1534
1535 /*      Given a (krb5_data *) entity (and optional realm),
1536 **      set the plain (char *) client_princ or service_host member
1537 **      of the kssl_ctx struct.
1538 */
1539 krb5_error_code
1540 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1541         krb5_data *realm, krb5_data *entity)
1542         {
1543         char    **princ;
1544         int     length;
1545
1546         if (kssl_ctx == NULL  ||  entity == NULL)  return KSSL_CTX_ERR;
1547
1548         switch (which)
1549                 {
1550         case KSSL_CLIENT:       princ = &kssl_ctx->client_princ;        break;
1551         case KSSL_SERVER:       princ = &kssl_ctx->service_host;        break;
1552         default:                return KSSL_CTX_ERR;                    break;
1553                 }
1554         if (*princ)  free(*princ);
1555
1556         length = entity->length + ((realm)? realm->length + 2: 1);
1557         if ((*princ = calloc(1, length)) == NULL)
1558                 return KSSL_CTX_ERR;
1559         else
1560                 {
1561                 strncpy(*princ, entity->data, entity->length);
1562                 if (realm)
1563                         {
1564                         strcat (*princ, "@");
1565                         (void) strncat(*princ, realm->data, realm->length);
1566                         }
1567                 }
1568
1569         return KSSL_CTX_OK;
1570         }
1571
1572
1573 /*      Set one of the plain (char *) string members of the kssl_ctx struct.
1574 **      Default values should be:
1575 **              which == KSSL_SERVICE   =>      "khost" (KRB5SVC)
1576 **              which == KSSL_KEYTAB    =>      "/etc/krb5.keytab" (KRB5KEYTAB)
1577 */
1578 krb5_error_code
1579 kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1580         {
1581         char    **string;
1582
1583         if (!kssl_ctx)  return KSSL_CTX_ERR;
1584
1585         switch (which)
1586                 {
1587         case KSSL_SERVICE:      string = &kssl_ctx->service_name;       break;
1588         case KSSL_SERVER:       string = &kssl_ctx->service_host;       break;
1589         case KSSL_CLIENT:       string = &kssl_ctx->client_princ;       break;
1590         case KSSL_KEYTAB:       string = &kssl_ctx->keytab_file;        break;
1591         default:                return KSSL_CTX_ERR;                    break;
1592                 }
1593         if (*string)  free(*string);
1594
1595         if (!text)
1596                 {
1597                 *string = '\0';
1598                 return KSSL_CTX_OK;
1599                 }
1600
1601         if ((*string = calloc(1, strlen(text) + 1)) == NULL)
1602                 return KSSL_CTX_ERR;
1603         else
1604                 strcpy(*string, text);
1605
1606         return KSSL_CTX_OK;
1607         }
1608
1609
1610 /*      Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1611 **      struct.  Clear kssl_ctx->key if Kerberos session key is NULL.
1612 */
1613 krb5_error_code
1614 kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1615         {
1616         int             length;
1617         krb5_enctype    enctype;
1618         krb5_octet FAR  *contents = NULL;
1619
1620         if (!kssl_ctx)  return KSSL_CTX_ERR;
1621
1622         if (kssl_ctx->key)
1623                 {
1624                 memset(kssl_ctx->key, 0, kssl_ctx->length);
1625                 free(kssl_ctx->key);
1626                 }
1627
1628         if (session)
1629                 {
1630
1631 #ifdef KRB5_HEIMDAL
1632                 length = session->keyvalue->length;
1633                 enctype = session->keytype;
1634                 contents = session->keyvalue->contents;
1635 #else
1636                 length = session->length;
1637                 enctype = session->enctype;
1638                 contents = session->contents;
1639 #endif
1640                 kssl_ctx->enctype = enctype;
1641                 kssl_ctx->length  = length;
1642                 }
1643         else
1644                 {
1645                 kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1646                 kssl_ctx->length  = 0;
1647                 return KSSL_CTX_OK;
1648                 }
1649
1650         if ((kssl_ctx->key =
1651                 (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL)
1652                 {
1653                 kssl_ctx->length  = 0;
1654                 return KSSL_CTX_ERR;
1655                 }
1656         else
1657                 memcpy(kssl_ctx->key, contents, length);
1658
1659         return KSSL_CTX_OK;
1660         }
1661
1662
1663 /*      Display contents of kssl_ctx struct
1664 */
1665 void
1666 kssl_ctx_show(KSSL_CTX *kssl_ctx)
1667         {
1668         int     i;
1669
1670         printf("kssl_ctx: ");
1671         if (kssl_ctx == NULL)
1672                 {
1673                 printf("NULL\n");
1674                 return;
1675                 }
1676         else
1677                 printf("%p\n", kssl_ctx);
1678
1679         printf("\tservice:\t%s\n",
1680                 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
1681         printf("\tclient:\t%s\n",
1682                 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
1683         printf("\tserver:\t%s\n",
1684                 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
1685         printf("\tkeytab:\t%s\n",
1686                 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
1687         printf("\tkey [%d:%d]:\t",
1688                 kssl_ctx->enctype, kssl_ctx->length);
1689
1690         for (i=0; i < kssl_ctx->length  &&  kssl_ctx->key; i++)
1691                 {
1692                 printf("%02x", kssl_ctx->key[i]);
1693                 }
1694         printf("\n");
1695         return;
1696         }
1697
1698     int
1699     kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1700 {
1701     krb5_context                krb5context = NULL;
1702     krb5_keytab                 krb5keytab = NULL;
1703     krb5_keytab_entry           entry;
1704     krb5_principal              princ = NULL;
1705     krb5_error_code             krb5rc = KRB5KRB_ERR_GENERIC;
1706     int rc = 0;
1707
1708     if ((krb5rc = krb5_init_context(&krb5context)))
1709         return(0);
1710
1711     /*  kssl_ctx->keytab_file == NULL ==> use Kerberos default
1712     */
1713     if (kssl_ctx->keytab_file)
1714     {
1715         krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1716                                   &krb5keytab);
1717         if (krb5rc)
1718             goto exit;
1719     }
1720     else
1721     {
1722         krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1723         if (krb5rc)
1724             goto exit;
1725     }
1726
1727     /* the host key we are looking for */
1728     krb5rc = krb5_sname_to_principal(krb5context, NULL,
1729                                      kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
1730                                      KRB5_NT_SRV_HST, &princ);
1731
1732     krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1733                                 princ,
1734                                 0 /* IGNORE_VNO */,
1735                                 0 /* IGNORE_ENCTYPE */,
1736                                 &entry);
1737     if ( krb5rc == KRB5_KT_NOTFOUND ) {
1738         rc = 1;
1739         goto exit;
1740     } else if ( krb5rc )
1741         goto exit;
1742
1743     krb5_kt_free_entry(krb5context, &entry);
1744     rc = 1;
1745
1746   exit:
1747     if (krb5keytab)     krb5_kt_close(krb5context, krb5keytab);
1748     if (princ)          krb5_free_principal(krb5context, princ);
1749     if (krb5context)    krb5_free_context(krb5context);
1750     return(rc);
1751 }
1752
1753 int
1754 kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1755         {
1756         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1757         krb5_context            krb5context = NULL;
1758         krb5_ccache             krb5ccdef = NULL;
1759         krb5_creds              krb5creds, *krb5credsp = NULL;
1760         int                     rc = 0;
1761
1762         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1763
1764         if (!kssl_ctx)
1765             return(0);
1766
1767         if (!kssl_ctx->service_host)
1768             return(0);
1769
1770         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1771             goto err;
1772
1773         if ((krb5rc = krb5_sname_to_principal(krb5context,
1774                                               kssl_ctx->service_host,
1775                                               (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1776                                               KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1777             goto err;
1778
1779         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1780             goto err;
1781
1782         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1783                                              &krb5creds.client)) != 0)
1784             goto err;
1785
1786         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1787                                             &krb5creds, &krb5credsp)) != 0)
1788             goto err;
1789
1790         rc = 1;
1791
1792       err:
1793 #ifdef KSSL_DEBUG
1794         kssl_ctx_show(kssl_ctx);
1795 #endif  /* KSSL_DEBUG */
1796
1797         if (krb5creds.client)   krb5_free_principal(krb5context, krb5creds.client);
1798         if (krb5creds.server)   krb5_free_principal(krb5context, krb5creds.server);
1799         if (krb5context)        krb5_free_context(krb5context);
1800         return(rc);
1801         }
1802
1803 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1804 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1805         {
1806 #ifdef KRB5_HEIMDAL
1807         data->length = 0;
1808         if (data->data)
1809             free(data->data);
1810 #elif defined(KRB5_MIT_OLD11)
1811         if (data->data)  {
1812                 krb5_xfree(data->data);
1813                 data->data = 0;
1814                 }
1815 #else
1816         krb5_free_data_contents(NULL, data);
1817 #endif
1818         }
1819 #endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1820
1821
1822 /*  Given pointers to KerberosTime and struct tm structs, convert the
1823 **  KerberosTime string to struct tm.  Note that KerberosTime is a
1824 **  ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional
1825 **  seconds as defined in RFC 1510.
1826 **  Return pointer to the (partially) filled in struct tm on success,
1827 **  return NULL on failure.
1828 */
1829 struct tm       *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
1830         {
1831         char            c, *p;
1832
1833         if (!k_tm)  return NULL;
1834         if (gtime == NULL  ||  gtime->length < 14)  return NULL;
1835         if (gtime->data == NULL)  return NULL;
1836
1837         p = (char *)&gtime->data[14];
1838
1839         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_sec  = atoi(p);      *(p+2) = c;
1840         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_min  = atoi(p);      *(p+2) = c;
1841         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_hour = atoi(p);      *(p+2) = c;
1842         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mday = atoi(p);      *(p+2) = c;
1843         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mon  = atoi(p)-1;    *(p+2) = c;
1844         c = *p;  *p = '\0';  p -= 4;  k_tm->tm_year = atoi(p)-1900; *(p+4) = c;
1845
1846         return k_tm;
1847         }
1848
1849
1850 /*  Helper function for kssl_validate_times().
1851 **  We need context->clockskew, but krb5_context is an opaque struct.
1852 **  So we try to sneek the clockskew out through the replay cache.
1853 **      If that fails just return a likely default (300 seconds).
1854 */
1855 krb5_deltat     get_rc_clockskew(krb5_context context)
1856         {
1857         krb5_rcache     rc;
1858         krb5_deltat     clockskew;
1859
1860         if (krb5_rc_default(context, &rc))  return KSSL_CLOCKSKEW;
1861         if (krb5_rc_initialize(context, rc, 0))  return KSSL_CLOCKSKEW;
1862         if (krb5_rc_get_lifespan(context, rc, &clockskew))  {
1863                 clockskew = KSSL_CLOCKSKEW;
1864                 }
1865         (void) krb5_rc_destroy(context, rc);
1866         return clockskew;
1867         }
1868
1869
1870 /*  kssl_validate_times() combines (and more importantly exposes)
1871 **  the MIT KRB5 internal function krb5_validate_times() and the
1872 **  in_clock_skew() macro.  The authenticator client time is checked
1873 **  to be within clockskew secs of the current time and the current
1874 **  time is checked to be within the ticket start and expire times.
1875 **  Either check may be omitted by supplying a NULL value.
1876 **  Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
1877 **  See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
1878 **  20010420 VRS
1879 */
1880 krb5_error_code  kssl_validate_times(   krb5_timestamp atime,
1881                                         krb5_ticket_times *ttimes)
1882         {
1883         krb5_deltat     skew;
1884         krb5_timestamp  start, now;
1885         krb5_error_code rc;
1886         krb5_context    context;
1887
1888         if ((rc = krb5_init_context(&context)))  return SSL_R_KRB5_S_BAD_TICKET;
1889         skew = get_rc_clockskew(context);
1890         if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
1891         krb5_free_context(context);
1892
1893         if (atime  &&  labs(atime - now) >= skew)  return SSL_R_KRB5_S_TKT_SKEW;
1894
1895         if (! ttimes)  return 0;
1896
1897         start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
1898         if (start - now > skew)  return SSL_R_KRB5_S_TKT_NYV;
1899         if ((now - ttimes->endtime) > skew)  return SSL_R_KRB5_S_TKT_EXPIRED;
1900
1901 #ifdef KSSL_DEBUG
1902         printf("kssl_validate_times: %d |<-  | %d - %d | < %d  ->| %d\n",
1903                 start, atime, now, skew, ttimes->endtime);
1904 #endif  /* KSSL_DEBUG */
1905
1906         return 0;
1907         }
1908
1909
1910 /*  Decode and decrypt given DER-encoded authenticator, then pass
1911 **  authenticator ctime back in *atimep (or 0 if time unavailable).
1912 **  Returns krb5_error_code and kssl_err on error.  A NULL
1913 **  authenticator (authentp->length == 0) is not considered an error.
1914 **  Note that kssl_check_authent() makes use of the KRB5 session key;
1915 **  you must call kssl_sget_tkt() to get the key before calling this routine.
1916 */
1917 krb5_error_code  kssl_check_authent(
1918                         /* IN     */    KSSL_CTX        *kssl_ctx,
1919                         /* IN     */    krb5_data       *authentp,
1920                         /* OUT    */    krb5_timestamp  *atimep,
1921                         /* OUT    */    KSSL_ERR        *kssl_err  )
1922         {
1923         krb5_error_code         krb5rc = 0;
1924         KRB5_ENCDATA            *dec_authent = NULL;
1925         KRB5_AUTHENTBODY        *auth = NULL;
1926         krb5_enctype            enctype;
1927         EVP_CIPHER_CTX          ciph_ctx;
1928         EVP_CIPHER              *enc = NULL;
1929         unsigned char           iv[EVP_MAX_IV_LENGTH];
1930         unsigned char           *p, *unenc_authent;
1931         int                     padl, outl, unencbufsize;
1932         struct tm               tm_time, *tm_l, *tm_g;
1933         time_t                  now, tl, tg, tr, tz_offset;
1934
1935         *atimep = 0;
1936         kssl_err_set(kssl_err, 0, "");
1937
1938 #ifndef KRB5CHECKAUTH
1939         authentp = NULL;
1940 #else
1941 #if     KRB5CHECKAUTH == 0
1942         authentp = NULL;
1943 #endif
1944 #endif  /* KRB5CHECKAUTH */
1945
1946         if (authentp == NULL  ||  authentp->length == 0)  return 0;
1947
1948 #ifdef KSSL_DEBUG
1949         {
1950         unsigned int ui;
1951         printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
1952         p = authentp->data;
1953         for (ui=0; ui < authentp->length; ui++)  printf("%02x ",p[ui]);
1954         printf("\n");
1955         }
1956 #endif  /* KSSL_DEBUG */
1957
1958         unencbufsize = 2 * authentp->length;
1959         if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
1960                 {
1961                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1962                         "Unable to allocate authenticator buffer.\n");
1963                 krb5rc = KRB5KRB_ERR_GENERIC;
1964                 goto err;
1965                 }
1966
1967         p = (unsigned char *)authentp->data;
1968         if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
1969                                         (long) authentp->length)) == NULL)
1970                 {
1971                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1972                         "Error decoding authenticator.\n");
1973                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1974                 goto err;
1975                 }
1976
1977         enctype = dec_authent->etype->data[0];  /* should = kssl_ctx->enctype */
1978 #if !defined(KRB5_MIT_OLD11)
1979             switch ( enctype ) {
1980             case ENCTYPE_DES3_CBC_SHA1:         /*    EVP_des_ede3_cbc();  */
1981             case ENCTYPE_DES3_CBC_SHA:
1982             case ENCTYPE_DES3_CBC_RAW:
1983                 krb5rc = 0;                     /* Skip, can't handle derived keys */
1984                 goto err;
1985             }
1986 #endif
1987         enc = kssl_map_enc(enctype);
1988         memset(iv, 0, EVP_MAX_IV_LENGTH);       /* per RFC 1510 */
1989
1990         if (enc == NULL)
1991                 {
1992                 /*  Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.
1993                 **  This enctype indicates the authenticator was encrypted
1994                 **  using key-usage derived keys which openssl cannot decrypt.
1995                 */
1996                 goto err;
1997                 }
1998         if (!EVP_DecryptInit(&ciph_ctx, enc, kssl_ctx->key, iv))
1999                 {
2000                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2001                         "EVP_DecryptInit error decrypting authenticator.\n");
2002                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2003                 goto err;
2004                 }
2005         if (!EVP_DecryptUpdate(&ciph_ctx, unenc_authent, &outl,
2006                         dec_authent->cipher->data, dec_authent->cipher->length))
2007                 {
2008                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2009                         "EVP_DecryptUpdate error decrypting authenticator.\n");
2010                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2011                 goto err;
2012                 }
2013         if (outl > unencbufsize)
2014                 {
2015                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2016                         "Buffer overflow decrypting authenticator.\n");
2017                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2018                 goto err;
2019                 }
2020         if (!EVP_DecryptFinal(&ciph_ctx, &(unenc_authent[outl]), &padl))
2021                 {
2022                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2023                         "EVP_DecryptFinal error decrypting authenticator.\n");
2024                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2025                 goto err;
2026                 }
2027         outl += padl;
2028         if (outl > unencbufsize)
2029                 {
2030                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2031                         "Buffer overflow decrypting authenticator.\n");
2032                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2033                 goto err;
2034                 }
2035         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2036
2037 #ifdef KSSL_DEBUG
2038         printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
2039         for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
2040         printf("\n");
2041 #endif  /* KSSL_DEBUG */
2042
2043         if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
2044                 {
2045                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2046                         "confounded by authenticator.\n");
2047                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2048                 goto err;
2049                 }
2050         outl -= p - unenc_authent;
2051
2052         if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
2053                                                           (long) outl))==NULL)
2054                 {
2055                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2056                         "Error decoding authenticator body.\n");
2057                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2058                 goto err;
2059                 }
2060
2061         memset(&tm_time,0,sizeof(struct tm));
2062         if (k_gmtime(auth->ctime, &tm_time)  &&
2063                 ((tr = mktime(&tm_time)) != (time_t)(-1)))
2064                 {
2065                 now  = time(&now);
2066                 tm_l = localtime(&now);         tl = mktime(tm_l);
2067                 tm_g = gmtime(&now);            tg = mktime(tm_g);
2068                 tz_offset = tg - tl;
2069
2070                 *atimep = tr - tz_offset;
2071                 }
2072
2073 #ifdef KSSL_DEBUG
2074         printf("kssl_check_authent: returns %d for client time ", *atimep);
2075         if (auth && auth->ctime && auth->ctime->length && auth->ctime->data)
2076                 printf("%.*s\n", auth->ctime->length, auth->ctime->data);
2077         else    printf("NULL\n");
2078 #endif  /* KSSL_DEBUG */
2079
2080  err:
2081         if (auth)               KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2082         if (dec_authent)        KRB5_ENCDATA_free(dec_authent);
2083         if (unenc_authent)      free(unenc_authent);
2084         return krb5rc;
2085         }
2086
2087
2088 /*  Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2089 **  because I dont't know how to stub varargs.
2090 **  Returns krb5_error_code == ENOMEM on alloc error, otherwise
2091 **  passes back newly constructed principal, which should be freed by caller.
2092 */
2093 krb5_error_code  kssl_build_principal_2(
2094                         /* UPDATE */    krb5_context    context,
2095                         /* OUT    */    krb5_principal  *princ,
2096                         /* IN     */    int rlen,  const char *realm,
2097                         /* IN     */    int slen,  const char *svc,
2098                         /* IN     */    int hlen,  const char *host)
2099         {
2100         krb5_data               *p_data = NULL;
2101         krb5_principal          new_p = NULL;
2102         char                    *new_r = NULL;
2103
2104         if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL  ||
2105             (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
2106                         == NULL)  goto err;
2107         new_p->length = 2;
2108         new_p->data = p_data;
2109
2110         if ((new_r = calloc(1, rlen + 1)) == NULL)  goto err;
2111         memcpy(new_r, realm, rlen);
2112         krb5_princ_set_realm_length(context, new_p, rlen);
2113         krb5_princ_set_realm_data(context, new_p, new_r);
2114
2115         if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL)  goto err;
2116         memcpy(new_p->data[0].data, svc, slen);
2117         new_p->data[0].length = slen;
2118
2119         if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL)  goto err;
2120         memcpy(new_p->data[1].data, host, hlen);
2121         new_p->data[1].length = hlen;
2122
2123         krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2124         *princ = new_p;
2125         return 0;
2126
2127  err:
2128         if (new_p  &&  new_p[0].data)   free(new_p[0].data);
2129         if (new_p  &&  new_p[1].data)   free(new_p[1].data);
2130         if (new_p)      free(new_p);
2131         if (new_r)      free(new_r);
2132         return ENOMEM;
2133         }
2134
2135
2136 #else /* !OPENSSL_NO_KRB5 */
2137
2138 #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2139 static int dummy=(int)&dummy;
2140 #endif
2141
2142 #endif  /* !OPENSSL_NO_KRB5     */
2143