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 500 /* glibc2 needs this to declare strptime() */
  72 #include <time.h>
  73 #if 0 /* Experimental */
  74 #undef _XOPEN_SOURCE /* To avoid clashes with anything else... */
  75 #endif
  76 #include <string.h>
  77
  78 #define KRB5_PRIVATE    1
  79
  80 #include <openssl/ssl.h>
  81 #include <openssl/evp.h>
  82 #include <openssl/objects.h>
  83 #include <openssl/krb5_asn.h>
  84
  85 #ifndef OPENSSL_NO_KRB5
  86
  87 #ifndef ENOMEM
  88 #define ENOMEM KRB5KRB_ERR_GENERIC
  89 #endif
  90
  91 /*
  92  * When OpenSSL is built on Windows, we do not want to require that
  93  * the Kerberos DLLs be available in order for the OpenSSL DLLs to
  94  * work.  Therefore, all Kerberos routines are loaded at run time
  95  * and we do not link to a .LIB file.
  96  */
  97
  98 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
  99 /*
 100  * The purpose of the following pre-processor statements is to provide
 101  * compatibility with different releases of MIT Kerberos for Windows.
 102  * All versions up to 1.2 used macros.  But macros do not allow for
 103  * a binary compatible interface for DLLs.  Therefore, all macros are
 104  * being replaced by function calls.  The following code will allow
 105  * an OpenSSL DLL built on Windows to work whether or not the macro
 106  * or function form of the routines are utilized.
 107  */
 108 #ifdef  krb5_cc_get_principal
 109 #define NO_DEF_KRB5_CCACHE
 110 #undef  krb5_cc_get_principal
 111 #endif
 112 #define krb5_cc_get_principal    kssl_krb5_cc_get_principal
 113
 114 #define krb5_free_data_contents  kssl_krb5_free_data_contents
 115 #define krb5_free_context        kssl_krb5_free_context
 116 #define krb5_auth_con_free       kssl_krb5_auth_con_free
 117 #define krb5_free_principal      kssl_krb5_free_principal
 118 #define krb5_mk_req_extended     kssl_krb5_mk_req_extended
 119 #define krb5_get_credentials     kssl_krb5_get_credentials
 120 #define krb5_cc_default          kssl_krb5_cc_default
 121 #define krb5_sname_to_principal  kssl_krb5_sname_to_principal
 122 #define krb5_init_context        kssl_krb5_init_context
 123 #define krb5_free_ticket         kssl_krb5_free_ticket
 124 #define krb5_rd_req              kssl_krb5_rd_req
 125 #define krb5_kt_default          kssl_krb5_kt_default
 126 #define krb5_kt_resolve          kssl_krb5_kt_resolve
 127 /* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */
 128 #ifndef krb5_kt_close
 129 #define krb5_kt_close            kssl_krb5_kt_close
 130 #endif /* krb5_kt_close */
 131 #ifndef krb5_kt_get_entry
 132 #define krb5_kt_get_entry        kssl_krb5_kt_get_entry
 133 #endif /* krb5_kt_get_entry */
 134 #define krb5_auth_con_init       kssl_krb5_auth_con_init
 135
 136 #define krb5_principal_compare   kssl_krb5_principal_compare
 137 #define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
 138 #define krb5_timeofday           kssl_krb5_timeofday
 139 #define krb5_rc_default           kssl_krb5_rc_default
 140
 141 #ifdef krb5_rc_initialize
 142 #undef krb5_rc_initialize
 143 #endif
 144 #define krb5_rc_initialize   kssl_krb5_rc_initialize
 145
 146 #ifdef krb5_rc_get_lifespan
 147 #undef krb5_rc_get_lifespan
 148 #endif
 149 #define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
 150
 151 #ifdef krb5_rc_destroy
 152 #undef krb5_rc_destroy
 153 #endif
 154 #define krb5_rc_destroy      kssl_krb5_rc_destroy
 155
 156 #define valid_cksumtype      kssl_valid_cksumtype
 157 #define krb5_checksum_size   kssl_krb5_checksum_size
 158 #define krb5_kt_free_entry   kssl_krb5_kt_free_entry
 159 #define krb5_auth_con_setrcache  kssl_krb5_auth_con_setrcache
 160 #define krb5_auth_con_getrcache  kssl_krb5_auth_con_getrcache
 161 #define krb5_get_server_rcache   kssl_krb5_get_server_rcache
 162
 163 /* Prototypes for built in stubs */
 164 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
 165 void kssl_krb5_free_principal(krb5_context, krb5_principal );
 166 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
 167                                      krb5_const char *,
 168                                      krb5_keytab *);
 169 krb5_error_code kssl_krb5_kt_default(krb5_context,
 170                                      krb5_keytab *);
 171 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
 172 krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *,
 173                                  krb5_const krb5_data *,
 174                                  krb5_const_principal, krb5_keytab,
 175                                  krb5_flags *,krb5_ticket **);
 176
 177 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
 178                                          krb5_const_principal);
 179 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
 180                                           krb5_auth_context  *,
 181                                           krb5_const krb5_flags,
 182                                           krb5_data  *,
 183                                           krb5_creds  *,
 184                                           krb5_data  * );
 185 krb5_error_code kssl_krb5_init_context(krb5_context *);
 186 void kssl_krb5_free_context(krb5_context);
 187 krb5_error_code kssl_krb5_cc_default(krb5_context,krb5_ccache  *);
 188 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
 189                                              krb5_const char  *,
 190                                              krb5_const char  *,
 191                                              krb5_int32,
 192                                              krb5_principal  *);
 193 krb5_error_code kssl_krb5_get_credentials(krb5_context,
 194                                           krb5_const krb5_flags,
 195                                           krb5_ccache,
 196                                           krb5_creds  *,
 197                                           krb5_creds  *  *);
 198 krb5_error_code kssl_krb5_auth_con_init(krb5_context,
 199                                         krb5_auth_context  *);
 200 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context,
 201                                            krb5_ccache cache,
 202                                            krb5_principal *principal);
 203 krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
 204 size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
 205 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
 206 krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
 207 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context,
 208                                              krb5_auth_context,
 209                                              krb5_rcache);
 210 krb5_error_code kssl_krb5_get_server_rcache(krb5_context,
 211                                             krb5_const krb5_data *,
 212                                             krb5_rcache *);
 213 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context,
 214                                              krb5_auth_context,
 215                                              krb5_rcache *);
 216
 217 /* Function pointers (almost all Kerberos functions are _stdcall) */
 218 static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
 219         =NULL;
 220 static void (_stdcall *p_krb5_free_principal)(krb5_context, krb5_principal )
 221         =NULL;
 222 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
 223                         (krb5_context, krb5_const char *, krb5_keytab *)=NULL;
 224 static krb5_error_code (_stdcall *p_krb5_kt_default)(krb5_context,
 225                                                      krb5_keytab *)=NULL;
 226 static krb5_error_code (_stdcall *p_krb5_free_ticket)(krb5_context,
 227                                                       krb5_ticket *)=NULL;
 228 static krb5_error_code (_stdcall *p_krb5_rd_req)(krb5_context,
 229                                                  krb5_auth_context *,
 230                                                  krb5_const krb5_data *,
 231                                                  krb5_const_principal,
 232                                                  krb5_keytab, krb5_flags *,
 233                                                  krb5_ticket **)=NULL;
 234 static krb5_error_code (_stdcall *p_krb5_mk_req_extended)
 235                         (krb5_context, krb5_auth_context *,
 236                          krb5_const krb5_flags, krb5_data *, krb5_creds *,
 237                          krb5_data * )=NULL;
 238 static krb5_error_code (_stdcall *p_krb5_init_context)(krb5_context *)=NULL;
 239 static void (_stdcall *p_krb5_free_context)(krb5_context)=NULL;
 240 static krb5_error_code (_stdcall *p_krb5_cc_default)(krb5_context,
 241                                                      krb5_ccache  *)=NULL;
 242 static krb5_error_code (_stdcall *p_krb5_sname_to_principal)
 243                         (krb5_context, krb5_const char *, krb5_const char *,
 244                          krb5_int32, krb5_principal *)=NULL;
 245 static krb5_error_code (_stdcall *p_krb5_get_credentials)
 246                         (krb5_context, krb5_const krb5_flags, krb5_ccache,
 247                          krb5_creds *, krb5_creds **)=NULL;
 248 static krb5_error_code (_stdcall *p_krb5_auth_con_init)
 249                         (krb5_context, krb5_auth_context *)=NULL;
 250 static krb5_error_code (_stdcall *p_krb5_cc_get_principal)
 251                         (krb5_context context, krb5_ccache cache,
 252                          krb5_principal *principal)=NULL;
 253 static krb5_error_code (_stdcall *p_krb5_auth_con_free)
 254                         (krb5_context, krb5_auth_context)=NULL;
 255 static krb5_error_code (_stdcall *p_krb5_decrypt_tkt_part)
 256                         (krb5_context, krb5_const krb5_keyblock *,
 257                                            krb5_ticket *)=NULL;
 258 static krb5_error_code (_stdcall *p_krb5_timeofday)
 259                         (krb5_context context, krb5_int32 *timeret)=NULL;
 260 static krb5_error_code (_stdcall *p_krb5_rc_default)
 261                         (krb5_context context, krb5_rcache *rc)=NULL;
 262 static krb5_error_code (_stdcall *p_krb5_rc_initialize)
 263                         (krb5_context context, krb5_rcache rc,
 264                                      krb5_deltat lifespan)=NULL;
 265 static krb5_error_code (_stdcall *p_krb5_rc_get_lifespan)
 266                         (krb5_context context, krb5_rcache rc,
 267                                        krb5_deltat *lifespan)=NULL;
 268 static krb5_error_code (_stdcall *p_krb5_rc_destroy)
 269                         (krb5_context context, krb5_rcache rc)=NULL;
 270 static krb5_boolean (_stdcall *p_krb5_principal_compare)
 271                      (krb5_context, krb5_const_principal, krb5_const_principal)=NULL;
 272 static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumtype ctype)=NULL;
 273 static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
 274 static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
 275                         (krb5_context,krb5_keytab_entry * )=NULL;
 276 static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context,
 277                                                                krb5_auth_context,
 278                                                                krb5_rcache)=NULL;
 279 static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context,
 280                                                               krb5_const krb5_data *,
 281                                                               krb5_rcache *)=NULL;
 282 static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context,
 283                                                       krb5_auth_context,
 284                                                       krb5_rcache *)=NULL;
 285 static krb5_error_code (_stdcall * p_krb5_kt_close)(krb5_context context,
 286                                                     krb5_keytab keytab)=NULL;
 287 static krb5_error_code (_stdcall * p_krb5_kt_get_entry)(krb5_context context,
 288                                                         krb5_keytab keytab,
 289                        krb5_const_principal principal, krb5_kvno vno,
 290                        krb5_enctype enctype, krb5_keytab_entry *entry)=NULL;
 291 static int krb5_loaded = 0;     /* only attempt to initialize func ptrs once */
 292
 293 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
 294 void
 295 load_krb5_dll(void)
 296         {
 297         HANDLE hKRB5_32;
 298
 299         krb5_loaded++;
 300         hKRB5_32 = LoadLibrary(TEXT("KRB5_32"));
 301         if (!hKRB5_32)
 302                 return;
 303
 304         (FARPROC) p_krb5_free_data_contents =
 305                 GetProcAddress( hKRB5_32, "krb5_free_data_contents" );
 306         (FARPROC) p_krb5_free_context =
 307                 GetProcAddress( hKRB5_32, "krb5_free_context" );
 308         (FARPROC) p_krb5_auth_con_free =
 309                 GetProcAddress( hKRB5_32, "krb5_auth_con_free" );
 310         (FARPROC) p_krb5_free_principal =
 311                 GetProcAddress( hKRB5_32, "krb5_free_principal" );
 312         (FARPROC) p_krb5_mk_req_extended =
 313                 GetProcAddress( hKRB5_32, "krb5_mk_req_extended" );
 314         (FARPROC) p_krb5_get_credentials =
 315                 GetProcAddress( hKRB5_32, "krb5_get_credentials" );
 316         (FARPROC) p_krb5_cc_get_principal =
 317                 GetProcAddress( hKRB5_32, "krb5_cc_get_principal" );
 318         (FARPROC) p_krb5_cc_default =
 319                 GetProcAddress( hKRB5_32, "krb5_cc_default" );
 320         (FARPROC) p_krb5_sname_to_principal =
 321                 GetProcAddress( hKRB5_32, "krb5_sname_to_principal" );
 322         (FARPROC) p_krb5_init_context =
 323                 GetProcAddress( hKRB5_32, "krb5_init_context" );
 324         (FARPROC) p_krb5_free_ticket =
 325                 GetProcAddress( hKRB5_32, "krb5_free_ticket" );
 326         (FARPROC) p_krb5_rd_req =
 327                 GetProcAddress( hKRB5_32, "krb5_rd_req" );
 328         (FARPROC) p_krb5_principal_compare =
 329                 GetProcAddress( hKRB5_32, "krb5_principal_compare" );
 330         (FARPROC) p_krb5_decrypt_tkt_part =
 331                 GetProcAddress( hKRB5_32, "krb5_decrypt_tkt_part" );
 332         (FARPROC) p_krb5_timeofday =
 333                 GetProcAddress( hKRB5_32, "krb5_timeofday" );
 334         (FARPROC) p_krb5_rc_default =
 335                 GetProcAddress( hKRB5_32, "krb5_rc_default" );
 336         (FARPROC) p_krb5_rc_initialize =
 337                 GetProcAddress( hKRB5_32, "krb5_rc_initialize" );
 338         (FARPROC) p_krb5_rc_get_lifespan =
 339                 GetProcAddress( hKRB5_32, "krb5_rc_get_lifespan" );
 340         (FARPROC) p_krb5_rc_destroy =
 341                 GetProcAddress( hKRB5_32, "krb5_rc_destroy" );
 342         (FARPROC) p_krb5_kt_default =
 343                 GetProcAddress( hKRB5_32, "krb5_kt_default" );
 344         (FARPROC) p_krb5_kt_resolve =
 345                 GetProcAddress( hKRB5_32, "krb5_kt_resolve" );
 346         (FARPROC) p_krb5_auth_con_init =
 347                 GetProcAddress( hKRB5_32, "krb5_auth_con_init" );
 348         (FARPROC) p_valid_cksumtype =
 349                 GetProcAddress( hKRB5_32, "valid_cksumtype" );
 350         (FARPROC) p_krb5_checksum_size =
 351                 GetProcAddress( hKRB5_32, "krb5_checksum_size" );
 352         (FARPROC) p_krb5_kt_free_entry =
 353                 GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
 354         (FARPROC) p_krb5_auth_con_setrcache =
 355                 GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
 356         (FARPROC) p_krb5_get_server_rcache =
 357                 GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
 358         (FARPROC) p_krb5_auth_con_getrcache =
 359                 GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
 360         (FARPROC) p_krb5_kt_close =
 361                 GetProcAddress( hKRB5_32, "krb5_kt_close" );
 362         (FARPROC) p_krb5_kt_get_entry =
 363                 GetProcAddress( hKRB5_32, "krb5_kt_get_entry" );
 364         }
 365
 366 /* Stubs for each function to be dynamicly loaded */
 367 void
 368 kssl_krb5_free_data_contents(krb5_context CO, krb5_data  * data)
 369         {
 370         if (!krb5_loaded)
 371                 load_krb5_dll();
 372
 373         if ( p_krb5_free_data_contents )
 374                 p_krb5_free_data_contents(CO,data);
 375         }
 376
 377 krb5_error_code
 378 kssl_krb5_mk_req_extended (krb5_context CO,
 379                           krb5_auth_context  * pACO,
 380                           krb5_const krb5_flags F,
 381                           krb5_data  * pD1,
 382                           krb5_creds  * pC,
 383                           krb5_data  * pD2)
 384         {
 385         if (!krb5_loaded)
 386                 load_krb5_dll();
 387
 388         if ( p_krb5_mk_req_extended )
 389                 return(p_krb5_mk_req_extended(CO,pACO,F,pD1,pC,pD2));
 390         else
 391                 return KRB5KRB_ERR_GENERIC;
 392         }
 393 krb5_error_code
 394 kssl_krb5_auth_con_init(krb5_context CO,
 395                        krb5_auth_context  * pACO)
 396         {
 397         if (!krb5_loaded)
 398                 load_krb5_dll();
 399
 400         if ( p_krb5_auth_con_init )
 401                 return(p_krb5_auth_con_init(CO,pACO));
 402         else
 403                 return KRB5KRB_ERR_GENERIC;
 404         }
 405 krb5_error_code
 406 kssl_krb5_auth_con_free (krb5_context CO,
 407                         krb5_auth_context ACO)
 408         {
 409         if (!krb5_loaded)
 410                 load_krb5_dll();
 411
 412         if ( p_krb5_auth_con_free )
 413                 return(p_krb5_auth_con_free(CO,ACO));
 414         else
 415                 return KRB5KRB_ERR_GENERIC;
 416         }
 417 krb5_error_code
 418 kssl_krb5_get_credentials(krb5_context CO,
 419                          krb5_const krb5_flags F,
 420                          krb5_ccache CC,
 421                          krb5_creds  * pCR,
 422                          krb5_creds  ** ppCR)
 423         {
 424         if (!krb5_loaded)
 425                 load_krb5_dll();
 426
 427         if ( p_krb5_get_credentials )
 428                 return(p_krb5_get_credentials(CO,F,CC,pCR,ppCR));
 429         else
 430                 return KRB5KRB_ERR_GENERIC;
 431         }
 432 krb5_error_code
 433 kssl_krb5_sname_to_principal(krb5_context CO,
 434                             krb5_const char  * pC1,
 435                             krb5_const char  * pC2,
 436                             krb5_int32 I,
 437                             krb5_principal  * pPR)
 438         {
 439         if (!krb5_loaded)
 440                 load_krb5_dll();
 441
 442         if ( p_krb5_sname_to_principal )
 443                 return(p_krb5_sname_to_principal(CO,pC1,pC2,I,pPR));
 444         else
 445                 return KRB5KRB_ERR_GENERIC;
 446         }
 447
 448 krb5_error_code
 449 kssl_krb5_cc_default(krb5_context CO,
 450                     krb5_ccache  * pCC)
 451         {
 452         if (!krb5_loaded)
 453                 load_krb5_dll();
 454
 455         if ( p_krb5_cc_default )
 456                 return(p_krb5_cc_default(CO,pCC));
 457         else
 458                 return KRB5KRB_ERR_GENERIC;
 459         }
 460
 461 krb5_error_code
 462 kssl_krb5_init_context(krb5_context * pCO)
 463         {
 464         if (!krb5_loaded)
 465                 load_krb5_dll();
 466
 467         if ( p_krb5_init_context )
 468                 return(p_krb5_init_context(pCO));
 469         else
 470                 return KRB5KRB_ERR_GENERIC;
 471         }
 472
 473 void
 474 kssl_krb5_free_context(krb5_context CO)
 475         {
 476         if (!krb5_loaded)
 477                 load_krb5_dll();
 478
 479         if ( p_krb5_free_context )
 480                 p_krb5_free_context(CO);
 481         }
 482
 483 void
 484 kssl_krb5_free_principal(krb5_context c, krb5_principal p)
 485         {
 486         if (!krb5_loaded)
 487                 load_krb5_dll();
 488
 489         if ( p_krb5_free_principal )
 490                 p_krb5_free_principal(c,p);
 491         }
 492
 493 krb5_error_code
 494 kssl_krb5_kt_resolve(krb5_context con,
 495                     krb5_const char * sz,
 496                     krb5_keytab * kt)
 497         {
 498         if (!krb5_loaded)
 499                 load_krb5_dll();
 500
 501         if ( p_krb5_kt_resolve )
 502                 return(p_krb5_kt_resolve(con,sz,kt));
 503         else
 504                 return KRB5KRB_ERR_GENERIC;
 505         }
 506
 507 krb5_error_code
 508 kssl_krb5_kt_default(krb5_context con,
 509                     krb5_keytab * kt)
 510         {
 511         if (!krb5_loaded)
 512                 load_krb5_dll();
 513
 514         if ( p_krb5_kt_default )
 515                 return(p_krb5_kt_default(con,kt));
 516         else
 517                 return KRB5KRB_ERR_GENERIC;
 518         }
 519
 520 krb5_error_code
 521 kssl_krb5_free_ticket(krb5_context con,
 522                      krb5_ticket * kt)
 523         {
 524         if (!krb5_loaded)
 525                 load_krb5_dll();
 526
 527         if ( p_krb5_free_ticket )
 528                 return(p_krb5_free_ticket(con,kt));
 529         else
 530                 return KRB5KRB_ERR_GENERIC;
 531         }
 532
 533 krb5_error_code
 534 kssl_krb5_rd_req(krb5_context con, krb5_auth_context * pacon,
 535                 krb5_const krb5_data * data,
 536                 krb5_const_principal princ, krb5_keytab keytab,
 537                 krb5_flags * flags, krb5_ticket ** pptkt)
 538         {
 539         if (!krb5_loaded)
 540                 load_krb5_dll();
 541
 542         if ( p_krb5_rd_req )
 543                 return(p_krb5_rd_req(con,pacon,data,princ,keytab,flags,pptkt));
 544         else
 545                 return KRB5KRB_ERR_GENERIC;
 546         }
 547
 548 krb5_boolean
 549 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
 550                 krb5_const_principal princ2)
 551         {
 552         if (!krb5_loaded)
 553                 load_krb5_dll();
 554
 555         if ( p_krb5_principal_compare )
 556                 return(p_krb5_principal_compare(con,princ1,princ2));
 557         else
 558                 return KRB5KRB_ERR_GENERIC;
 559         }
 560
 561 krb5_error_code
 562 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
 563                 krb5_ticket *ticket)
 564         {
 565         if (!krb5_loaded)
 566                 load_krb5_dll();
 567
 568         if ( p_krb5_decrypt_tkt_part )
 569                 return(p_krb5_decrypt_tkt_part(con,keys,ticket));
 570         else
 571                 return KRB5KRB_ERR_GENERIC;
 572         }
 573
 574 krb5_error_code
 575 krb5_timeofday(krb5_context con, krb5_int32 *timeret)
 576         {
 577         if (!krb5_loaded)
 578                 load_krb5_dll();
 579
 580         if ( p_krb5_timeofday )
 581                 return(p_krb5_timeofday(con,timeret));
 582         else
 583                 return KRB5KRB_ERR_GENERIC;
 584         }
 585
 586 krb5_error_code
 587 krb5_rc_default(krb5_context con, krb5_rcache *rc)
 588         {
 589         if (!krb5_loaded)
 590                 load_krb5_dll();
 591
 592         if ( p_krb5_rc_default )
 593                 return(p_krb5_rc_default(con,rc));
 594         else
 595                 return KRB5KRB_ERR_GENERIC;
 596         }
 597
 598 krb5_error_code
 599 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
 600         {
 601         if (!krb5_loaded)
 602                 load_krb5_dll();
 603
 604         if ( p_krb5_rc_initialize )
 605                 return(p_krb5_rc_initialize(con, rc, lifespan));
 606         else
 607                 return KRB5KRB_ERR_GENERIC;
 608         }
 609
 610 krb5_error_code
 611 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
 612         {
 613         if (!krb5_loaded)
 614                 load_krb5_dll();
 615
 616         if ( p_krb5_rc_get_lifespan )
 617                 return(p_krb5_rc_get_lifespan(con, rc, lifespanp));
 618         else
 619                 return KRB5KRB_ERR_GENERIC;
 620         }
 621
 622 krb5_error_code
 623 krb5_rc_destroy(krb5_context con, krb5_rcache rc)
 624         {
 625         if (!krb5_loaded)
 626                 load_krb5_dll();
 627
 628         if ( p_krb5_rc_destroy )
 629                 return(p_krb5_rc_destroy(con, rc));
 630         else
 631                 return KRB5KRB_ERR_GENERIC;
 632         }
 633
 634 size_t
 635 krb5_checksum_size(krb5_context context,krb5_cksumtype ctype)
 636         {
 637         if (!krb5_loaded)
 638                 load_krb5_dll();
 639
 640         if ( p_krb5_checksum_size )
 641                 return(p_krb5_checksum_size(context, ctype));
 642         else
 643                 return KRB5KRB_ERR_GENERIC;
 644         }
 645
 646 krb5_boolean
 647 valid_cksumtype(krb5_cksumtype ctype)
 648         {
 649         if (!krb5_loaded)
 650                 load_krb5_dll();
 651
 652         if ( p_valid_cksumtype )
 653                 return(p_valid_cksumtype(ctype));
 654         else
 655                 return KRB5KRB_ERR_GENERIC;
 656         }
 657
 658 krb5_error_code
 659 krb5_kt_free_entry(krb5_context con,krb5_keytab_entry * entry)
 660         {
 661         if (!krb5_loaded)
 662                 load_krb5_dll();
 663
 664         if ( p_krb5_kt_free_entry )
 665                 return(p_krb5_kt_free_entry(con,entry));
 666         else
 667                 return KRB5KRB_ERR_GENERIC;
 668         }
 669
 670 /* Structure definitions  */
 671 #ifndef NO_DEF_KRB5_CCACHE
 672 #ifndef krb5_x
 673 #define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
 674 #define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
 675 #endif
 676
 677 typedef krb5_pointer    krb5_cc_cursor; /* cursor for sequential lookup */
 678
 679 typedef struct _krb5_ccache
 680         {
 681         krb5_magic magic;
 682         struct _krb5_cc_ops FAR *ops;
 683         krb5_pointer data;
 684         } *krb5_ccache;
 685
 686 typedef struct _krb5_cc_ops
 687         {
 688         krb5_magic magic;
 689         char  *prefix;
 690         char  * (KRB5_CALLCONV *get_name)
 691                 (krb5_context, krb5_ccache);
 692         krb5_error_code (KRB5_CALLCONV *resolve)
 693                 (krb5_context, krb5_ccache  *, const char  *);
 694         krb5_error_code (KRB5_CALLCONV *gen_new)
 695                 (krb5_context, krb5_ccache  *);
 696         krb5_error_code (KRB5_CALLCONV *init)
 697                 (krb5_context, krb5_ccache, krb5_principal);
 698         krb5_error_code (KRB5_CALLCONV *destroy)
 699                 (krb5_context, krb5_ccache);
 700         krb5_error_code (KRB5_CALLCONV *close)
 701                 (krb5_context, krb5_ccache);
 702         krb5_error_code (KRB5_CALLCONV *store)
 703                 (krb5_context, krb5_ccache, krb5_creds  *);
 704         krb5_error_code (KRB5_CALLCONV *retrieve)
 705                 (krb5_context, krb5_ccache,
 706                 krb5_flags, krb5_creds  *, krb5_creds  *);
 707         krb5_error_code (KRB5_CALLCONV *get_princ)
 708                 (krb5_context, krb5_ccache, krb5_principal  *);
 709         krb5_error_code (KRB5_CALLCONV *get_first)
 710                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
 711         krb5_error_code (KRB5_CALLCONV *get_next)
 712                 (krb5_context, krb5_ccache,
 713                 krb5_cc_cursor  *, krb5_creds  *);
 714         krb5_error_code (KRB5_CALLCONV *end_get)
 715                 (krb5_context, krb5_ccache, krb5_cc_cursor  *);
 716         krb5_error_code (KRB5_CALLCONV *remove_cred)
 717                 (krb5_context, krb5_ccache,
 718                 krb5_flags, krb5_creds  *);
 719         krb5_error_code (KRB5_CALLCONV *set_flags)
 720                 (krb5_context, krb5_ccache, krb5_flags);
 721         } krb5_cc_ops;
 722 #endif /* NO_DEF_KRB5_CCACHE */
 723
 724 krb5_error_code
 725 kssl_krb5_cc_get_principal
 726     (krb5_context context, krb5_ccache cache,
 727       krb5_principal *principal)
 728         {
 729         if ( p_krb5_cc_get_principal )
 730                 return(p_krb5_cc_get_principal(context,cache,principal));
 731         else
 732                 return(krb5_x
 733                         ((cache)->ops->get_princ,(context, cache, principal)));
 734         }
 735
 736 krb5_error_code
 737 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
 738                              krb5_rcache rcache)
 739         {
 740         if ( p_krb5_auth_con_setrcache )
 741                  return(p_krb5_auth_con_setrcache(con,acon,rcache));
 742         else
 743                  return KRB5KRB_ERR_GENERIC;
 744         }
 745
 746 krb5_error_code
 747 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
 748                             krb5_rcache * rcache)
 749         {
 750         if ( p_krb5_get_server_rcache )
 751                 return(p_krb5_get_server_rcache(con,data,rcache));
 752         else
 753                 return KRB5KRB_ERR_GENERIC;
 754         }
 755
 756 krb5_error_code
 757 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
 758                              krb5_rcache * prcache)
 759         {
 760         if ( p_krb5_auth_con_getrcache )
 761                 return(p_krb5_auth_con_getrcache(con,acon, prcache));
 762         else
 763                 return KRB5KRB_ERR_GENERIC;
 764         }
 765
 766 krb5_error_code
 767 kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab)
 768         {
 769         if ( p_krb5_kt_close )
 770                 return(p_krb5_kt_close(context,keytab));
 771         else
 772                 return KRB5KRB_ERR_GENERIC;
 773         }
 774
 775 krb5_error_code
 776 kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
 777                        krb5_const_principal principal, krb5_kvno vno,
 778                        krb5_enctype enctype, krb5_keytab_entry *entry)
 779         {
 780         if ( p_krb5_kt_get_entry )
 781                 return(p_krb5_kt_get_entry(context,keytab,principal,vno,enctype,entry));
 782         else
 783                 return KRB5KRB_ERR_GENERIC;
 784         }
 785 #endif  /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
 786
 787 char
 788 *kstring(char *string)
 789         {
 790         static char     *null = "[NULL]";
 791
 792         return ((string == NULL)? null: string);
 793         }
 794
 795 /*      Given KRB5 enctype (basically DES or 3DES),
 796 **      return closest match openssl EVP_ encryption algorithm.
 797 **      Return NULL for unknown or problematic (krb5_dk_encrypt) enctypes.
 798 **      Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are OK.
 799 */
 800 const EVP_CIPHER *
 801 kssl_map_enc(krb5_enctype enctype)
 802         {
 803         switch (enctype)
 804                 {
 805         case ENCTYPE_DES_HMAC_SHA1:             /*    EVP_des_cbc();       */
 806         case ENCTYPE_DES_CBC_CRC:
 807         case ENCTYPE_DES_CBC_MD4:
 808         case ENCTYPE_DES_CBC_MD5:
 809         case ENCTYPE_DES_CBC_RAW:
 810                                 return EVP_des_cbc();
 811                                 break;
 812         case ENCTYPE_DES3_CBC_SHA1:             /*    EVP_des_ede3_cbc();  */
 813         case ENCTYPE_DES3_CBC_SHA:
 814         case ENCTYPE_DES3_CBC_RAW:
 815                                 return EVP_des_ede3_cbc();
 816                                 break;
 817         default:                return NULL;
 818                                 break;
 819                 }
 820         }
 821
 822
 823 /*      Return true:1 if p "looks like" the start of the real authenticator
 824 **      described in kssl_skip_confound() below.  The ASN.1 pattern is
 825 **      "62 xx 30 yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and
 826 **      xx and yy are possibly multi-byte length fields.
 827 */
 828 int     kssl_test_confound(unsigned char *p)
 829         {
 830         int     len = 2;
 831         int     xx = 0, yy = 0;
 832
 833         if (*p++ != 0x62)  return 0;
 834         if (*p > 0x82)  return 0;
 835         switch(*p)  {
 836                 case 0x82:  p++;          xx = (*p++ << 8);  xx += *p++;  break;
 837                 case 0x81:  p++;          xx =  *p++;  break;
 838                 case 0x80:  return 0;
 839                 default:    xx = *p++;  break;
 840                 }
 841         if (*p++ != 0x30)  return 0;
 842         if (*p > 0x82)  return 0;
 843         switch(*p)  {
 844                 case 0x82:  p++; len+=2;  yy = (*p++ << 8);  yy += *p++;  break;
 845                 case 0x81:  p++; len++;   yy =  *p++;  break;
 846                 case 0x80:  return 0;
 847                 default:    yy = *p++;  break;
 848                 }
 849
 850         return (xx - len == yy)? 1: 0;
 851         }
 852
 853 /*      Allocate, fill, and return cksumlens array of checksum lengths.
 854 **      This array holds just the unique elements from the krb5_cksumarray[].
 855 **      array[n] == 0 signals end of data.
 856 **
 857 **      The krb5_cksumarray[] was an internal variable that has since been
 858 **      replaced by a more general method for storing the data.  It should
 859 **      not be used.  Instead we use real API calls and make a guess for
 860 **      what the highest assigned CKSUMTYPE_ constant is.  As of 1.2.2
 861 **      it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3).  So we will use 0x0010.
 862 */
 863 size_t  *populate_cksumlens(void)
 864         {
 865         int             i, j, n;
 866         static size_t   *cklens = NULL;
 867
 868 #ifdef KRB5_MIT_OLD11
 869         n = krb5_max_cksum;
 870 #else
 871         n = 0x0010;
 872 #endif  /* KRB5_MIT_OLD11 */
 873
 874 #ifdef KRB5CHECKAUTH
 875         if (!cklens && !(cklens = (size_t *) calloc(sizeof(int),n+1)))  return NULL;
 876
 877         for (i=0; i < n; i++)  {
 878                 if (!valid_cksumtype(i))  continue;     /*  array has holes  */
 879                 for (j=0; j < n; j++)  {
 880                         if (cklens[j] == 0)  {
 881                                 cklens[j] = krb5_checksum_size(NULL,i);
 882                                 break;          /*  krb5 elem was new: add   */
 883                                 }
 884                         if (cklens[j] == krb5_checksum_size(NULL,i))  {
 885                                 break;          /*  ignore duplicate elements */
 886                                 }
 887                         }
 888                 }
 889 #endif  /* KRB5CHECKAUTH */
 890
 891         return cklens;
 892         }
 893
 894 /*      Return pointer to start of real authenticator within authenticator, or
 895 **      return NULL on error.
 896 **      Decrypted authenticator looks like this:
 897 **              [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
 898 **      This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
 899 **      krb5_auth_con_getcksumtype() function advertised in its krb5.h.
 900 */
 901 unsigned char   *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
 902         {
 903         int             i, conlen;
 904         size_t          cklen;
 905         static size_t   *cksumlens = NULL;
 906         unsigned char   *test_auth;
 907
 908         conlen = (etype)? 8: 0;
 909
 910         if (!cksumlens  &&  !(cksumlens = populate_cksumlens()))  return NULL;
 911         for (i=0; (cklen = cksumlens[i]) != 0; i++)
 912                 {
 913                 test_auth = a + conlen + cklen;
 914                 if (kssl_test_confound(test_auth))  return test_auth;
 915                 }
 916
 917         return NULL;
 918         }
 919
 920
 921 /*      Set kssl_err error info when reason text is a simple string
 922 **              kssl_err = struct { int reason; char text[KSSL_ERR_MAX+1]; }
 923 */
 924 void
 925 kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
 926         {
 927         if (kssl_err == NULL)  return;
 928
 929         kssl_err->reason = reason;
 930         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, text);
 931         return;
 932         }
 933
 934
 935 /*      Display contents of krb5_data struct, for debugging
 936 */
 937 void
 938 print_krb5_data(char *label, krb5_data *kdata)
 939         {
 940         int i;
 941
 942         printf("%s[%d] ", label, kdata->length);
 943         for (i=0; i < (int)kdata->length; i++)
 944                 {
 945                 if (0 &&  isprint((int) kdata->data[i]))
 946                         printf( "%c ",  kdata->data[i]);
 947                 else
 948                         printf( "%02x ", (unsigned char) kdata->data[i]);
 949                 }
 950         printf("\n");
 951         }
 952
 953
 954 /*      Display contents of krb5_authdata struct, for debugging
 955 */
 956 void
 957 print_krb5_authdata(char *label, krb5_authdata **adata)
 958         {
 959         if (adata == NULL)
 960                 {
 961                 printf("%s, authdata==0\n", label);
 962                 return;
 963                 }
 964         printf("%s [%p]\n", label, (void *)adata);
 965 #if 0
 966         {
 967         int     i;
 968         printf("%s[at%d:%d] ", label, adata->ad_type, adata->length);
 969         for (i=0; i < adata->length; i++)
 970                 {
 971                 printf((isprint(adata->contents[i]))? "%c ": "%02x",
 972                         adata->contents[i]);
 973                 }
 974         printf("\n");
 975         }
 976 #endif
 977         }
 978
 979
 980 /*      Display contents of krb5_keyblock struct, for debugging
 981 */
 982 void
 983 print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
 984         {
 985         int i;
 986
 987         if (keyblk == NULL)
 988                 {
 989                 printf("%s, keyblk==0\n", label);
 990                 return;
 991                 }
 992 #ifdef KRB5_HEIMDAL
 993         printf("%s\n\t[et%d:%d]: ", label, keyblk->keytype,
 994                                            keyblk->keyvalue->length);
 995         for (i=0; i < (int)keyblk->keyvalue->length; i++)
 996                 {
 997                 printf("%02x",(unsigned char *)(keyblk->keyvalue->contents)[i]);
 998                 }
 999         printf("\n");
1000 #else
1001         printf("%s\n\t[et%d:%d]: ", label, keyblk->enctype, keyblk->length);
1002         for (i=0; i < (int)keyblk->length; i++)
1003                 {
1004                 printf("%02x",keyblk->contents[i]);
1005                 }
1006         printf("\n");
1007 #endif
1008         }
1009
1010
1011 /*      Display contents of krb5_principal_data struct, for debugging
1012 **      (krb5_principal is typedef'd == krb5_principal_data *)
1013 */
1014 void
1015 print_krb5_princ(char *label, krb5_principal_data *princ)
1016         {
1017         int i, ui, uj;
1018
1019         printf("%s principal Realm: ", label);
1020         if (princ == NULL)  return;
1021         for (ui=0; ui < (int)princ->realm.length; ui++)  putchar(princ->realm.data[ui]);
1022         printf(" (nametype %d) has %d strings:\n", princ->type,princ->length);
1023         for (i=0; i < (int)princ->length; i++)
1024                 {
1025                 printf("\t%d [%d]: ", i, princ->data[i].length);
1026                 for (uj=0; uj < (int)princ->data[i].length; uj++)  {
1027                         putchar(princ->data[i].data[uj]);
1028                         }
1029                 printf("\n");
1030                 }
1031         return;
1032         }
1033
1034
1035 /*      Given krb5 service (typically "kssl") and hostname in kssl_ctx,
1036 **      Return encrypted Kerberos ticket for service @ hostname.
1037 **      If authenp is non-NULL, also return encrypted authenticator,
1038 **      whose data should be freed by caller.
1039 **      (Originally was: Create Kerberos AP_REQ message for SSL Client.)
1040 **
1041 **      19990628        VRS     Started; Returns Kerberos AP_REQ message.
1042 **      20010409        VRS     Modified for RFC2712; Returns enc tkt.
1043 **      20010606        VRS     May also return optional authenticator.
1044 */
1045 krb5_error_code
1046 kssl_cget_tkt(  /* UPDATE */    KSSL_CTX *kssl_ctx,
1047                 /* OUT    */    krb5_data **enc_ticketp,
1048                 /* UPDATE */    krb5_data *authenp,
1049                 /* OUT    */    KSSL_ERR *kssl_err)
1050         {
1051         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1052         krb5_context            krb5context = NULL;
1053         krb5_auth_context       krb5auth_context = NULL;
1054         krb5_ccache             krb5ccdef = NULL;
1055         krb5_creds              krb5creds, *krb5credsp = NULL;
1056         krb5_data               krb5_app_req;
1057
1058         kssl_err_set(kssl_err, 0, "");
1059         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1060
1061         if (!kssl_ctx)
1062                 {
1063                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1064                         "No kssl_ctx defined.\n");
1065                 goto err;
1066                 }
1067         else if (!kssl_ctx->service_host)
1068                 {
1069                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1070                         "kssl_ctx service_host undefined.\n");
1071                 goto err;
1072                 }
1073
1074         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1075                 {
1076                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1077                         "krb5_init_context() fails: %d\n", krb5rc);
1078                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1079                 goto err;
1080                 }
1081
1082         if ((krb5rc = krb5_sname_to_principal(krb5context,
1083                 kssl_ctx->service_host,
1084                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1085                 KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1086                 {
1087                 BIO_snprintf(kssl_err->text,KSSL_ERR_MAX,
1088                         "krb5_sname_to_principal() fails for %s/%s\n",
1089                         kssl_ctx->service_host,
1090                         (kssl_ctx->service_name)? kssl_ctx->service_name:
1091                                                   KRB5SVC);
1092                 kssl_err->reason = SSL_R_KRB5_C_INIT;
1093                 goto err;
1094                 }
1095
1096         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1097                 {
1098                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1099                         "krb5_cc_default fails.\n");
1100                 goto err;
1101                 }
1102
1103         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1104                 &krb5creds.client)) != 0)
1105                 {
1106                 kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1107                         "krb5_cc_get_principal() fails.\n");
1108                 goto err;
1109                 }
1110
1111         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1112                 &krb5creds, &krb5credsp)) != 0)
1113                 {
1114                 kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1115                         "krb5_get_credentials() fails.\n");
1116                 goto err;
1117                 }
1118
1119         *enc_ticketp = &krb5credsp->ticket;
1120 #ifdef KRB5_HEIMDAL
1121         kssl_ctx->enctype = krb5credsp->session.keytype;
1122 #else
1123         kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1124 #endif
1125
1126         krb5rc = KRB5KRB_ERR_GENERIC;
1127         /*      caller should free data of krb5_app_req  */
1128         /*  20010406 VRS deleted for real KerberosWrapper
1129         **  20010605 VRS reinstated to offer Authenticator to KerberosWrapper
1130         */
1131         krb5_app_req.length = 0;
1132         if (authenp)
1133                 {
1134                 krb5_data       krb5in_data;
1135                 const unsigned char     *p;
1136                 long            arlen;
1137                 KRB5_APREQBODY  *ap_req;
1138
1139                 authenp->length = 0;
1140                 krb5in_data.data = NULL;
1141                 krb5in_data.length = 0;
1142                 if ((krb5rc = krb5_mk_req_extended(krb5context,
1143                         &krb5auth_context, 0, &krb5in_data, krb5credsp,
1144                         &krb5_app_req)) != 0)
1145                         {
1146                         kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1147                                 "krb5_mk_req_extended() fails.\n");
1148                         goto err;
1149                         }
1150
1151                 arlen = krb5_app_req.length;
1152                 p = (unsigned char *)krb5_app_req.data;
1153                 ap_req = (KRB5_APREQBODY *) d2i_KRB5_APREQ(NULL, &p, arlen);
1154                 if (ap_req)
1155                         {
1156                         authenp->length = i2d_KRB5_ENCDATA(
1157                                         ap_req->authenticator, NULL);
1158                         if (authenp->length  &&
1159                                 (authenp->data = malloc(authenp->length)))
1160                                 {
1161                                 unsigned char   *adp = (unsigned char *)authenp->data;
1162                                 authenp->length = i2d_KRB5_ENCDATA(
1163                                                 ap_req->authenticator, &adp);
1164                                 }
1165                         }
1166
1167                 if (ap_req)  KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1168                 if (krb5_app_req.length)
1169                         kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
1170                 }
1171 #ifdef KRB5_HEIMDAL
1172         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
1173                 {
1174                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1175                         "kssl_ctx_setkey() fails.\n");
1176                 }
1177 #else
1178         if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock))
1179                 {
1180                 kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1181                         "kssl_ctx_setkey() fails.\n");
1182                 }
1183 #endif
1184         else    krb5rc = 0;
1185
1186  err:
1187 #ifdef KSSL_DEBUG
1188         kssl_ctx_show(kssl_ctx);
1189 #endif  /* KSSL_DEBUG */
1190
1191         if (krb5creds.client)   krb5_free_principal(krb5context,
1192                                                         krb5creds.client);
1193         if (krb5creds.server)   krb5_free_principal(krb5context,
1194                                                         krb5creds.server);
1195         if (krb5auth_context)   krb5_auth_con_free(krb5context,
1196                                                         krb5auth_context);
1197         if (krb5context)        krb5_free_context(krb5context);
1198         return (krb5rc);
1199         }
1200
1201
1202 /*  Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1203 **  Return Kerberos error code and kssl_err struct on error.
1204 **  Allocates krb5_ticket and krb5_principal; caller should free these.
1205 **
1206 **      20010410        VRS     Implemented krb5_decode_ticket() as
1207 **                              old_krb5_decode_ticket(). Missing from MIT1.0.6.
1208 **      20010615        VRS     Re-cast as openssl/asn1 d2i_*() functions.
1209 **                              Re-used some of the old krb5_decode_ticket()
1210 **                              code here.  This tkt should alloc/free just
1211 **                              like the real thing.
1212 */
1213 krb5_error_code
1214 kssl_TKT2tkt(   /* IN     */    krb5_context    krb5context,
1215                 /* IN     */    KRB5_TKTBODY    *asn1ticket,
1216                 /* OUT    */    krb5_ticket     **krb5ticket,
1217                 /* OUT    */    KSSL_ERR *kssl_err  )
1218         {
1219         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1220         krb5_ticket                     *new5ticket = NULL;
1221         ASN1_GENERALSTRING              *gstr_svc, *gstr_host;
1222
1223         *krb5ticket = NULL;
1224
1225         if (asn1ticket == NULL  ||  asn1ticket->realm == NULL  ||
1226                 asn1ticket->sname == NULL  ||
1227                 sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2)
1228                 {
1229                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1230                         "Null field in asn1ticket.\n");
1231                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1232                 return KRB5KRB_ERR_GENERIC;
1233                 }
1234
1235         if ((new5ticket = (krb5_ticket *) calloc(1, sizeof(krb5_ticket)))==NULL)
1236                 {
1237                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1238                         "Unable to allocate new krb5_ticket.\n");
1239                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1240                 return ENOMEM;          /*  or  KRB5KRB_ERR_GENERIC;    */
1241                 }
1242
1243         gstr_svc  = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0);
1244         gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1);
1245
1246         if ((krb5rc = kssl_build_principal_2(krb5context,
1247                         &new5ticket->server,
1248                         asn1ticket->realm->length, (char *)asn1ticket->realm->data,
1249                         gstr_svc->length,  (char *)gstr_svc->data,
1250                         gstr_host->length, (char *)gstr_host->data)) != 0)
1251                 {
1252                 free(new5ticket);
1253                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1254                         "Error building ticket server principal.\n");
1255                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1256                 return krb5rc;          /*  or  KRB5KRB_ERR_GENERIC;    */
1257                 }
1258
1259         krb5_princ_type(krb5context, new5ticket->server) =
1260                         asn1ticket->sname->nametype->data[0];
1261         new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1262         new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1263         new5ticket->enc_part.ciphertext.length =
1264                         asn1ticket->encdata->cipher->length;
1265         if ((new5ticket->enc_part.ciphertext.data =
1266                 calloc(1, asn1ticket->encdata->cipher->length)) == NULL)
1267                 {
1268                 free(new5ticket);
1269                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1270                         "Error allocating cipher in krb5ticket.\n");
1271                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1272                 return KRB5KRB_ERR_GENERIC;
1273                 }
1274         else
1275                 {
1276                 memcpy(new5ticket->enc_part.ciphertext.data,
1277                         asn1ticket->encdata->cipher->data,
1278                         asn1ticket->encdata->cipher->length);
1279                 }
1280
1281         *krb5ticket = new5ticket;
1282         return 0;
1283         }
1284
1285
1286 /*      Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1287 **              and krb5 AP_REQ message & message length,
1288 **      Return Kerberos session key and client principle
1289 **              to SSL Server in KSSL_CTX *kssl_ctx.
1290 **
1291 **      19990702        VRS     Started.
1292 */
1293 krb5_error_code
1294 kssl_sget_tkt(  /* UPDATE */    KSSL_CTX                *kssl_ctx,
1295                 /* IN     */    krb5_data               *indata,
1296                 /* OUT    */    krb5_ticket_times       *ttimes,
1297                 /* OUT    */    KSSL_ERR                *kssl_err  )
1298         {
1299         krb5_error_code                 krb5rc = KRB5KRB_ERR_GENERIC;
1300         static krb5_context             krb5context = NULL;
1301         static krb5_auth_context        krb5auth_context = NULL;
1302         krb5_ticket                     *krb5ticket = NULL;
1303         KRB5_TKTBODY                    *asn1ticket = NULL;
1304         const unsigned char             *p;
1305         krb5_keytab                     krb5keytab = NULL;
1306         krb5_keytab_entry               kt_entry;
1307         krb5_principal                  krb5server;
1308         krb5_rcache                     rcache = NULL;
1309
1310         kssl_err_set(kssl_err, 0, "");
1311
1312         if (!kssl_ctx)
1313                 {
1314                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1315                         "No kssl_ctx defined.\n");
1316                 goto err;
1317                 }
1318
1319 #ifdef KSSL_DEBUG
1320         printf("in kssl_sget_tkt(%s)\n", kstring(kssl_ctx->service_name));
1321 #endif  /* KSSL_DEBUG */
1322
1323         if (!krb5context  &&  (krb5rc = krb5_init_context(&krb5context)))
1324                 {
1325                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1326                         "krb5_init_context() fails.\n");
1327                 goto err;
1328                 }
1329         if (krb5auth_context  &&
1330                 (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context)))
1331                 {
1332                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1333                         "krb5_auth_con_free() fails.\n");
1334                 goto err;
1335                 }
1336         else  krb5auth_context = NULL;
1337         if (!krb5auth_context  &&
1338                 (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context)))
1339                 {
1340                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1341                         "krb5_auth_con_init() fails.\n");
1342                 goto err;
1343                 }
1344
1345
1346         if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1347                 &rcache)))
1348                 {
1349                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1350                         "krb5_auth_con_getrcache() fails.\n");
1351                 goto err;
1352                 }
1353
1354         if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1355                 (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1356                 KRB5_NT_SRV_HST, &krb5server)) != 0)
1357                 {
1358                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1359                         "krb5_sname_to_principal() fails.\n");
1360                 goto err;
1361                 }
1362
1363         if (rcache == NULL)
1364                 {
1365                 if ((krb5rc = krb5_get_server_rcache(krb5context,
1366                         krb5_princ_component(krb5context, krb5server, 0),
1367                         &rcache)))
1368                         {
1369                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1370                                 "krb5_get_server_rcache() fails.\n");
1371                         goto err;
1372                         }
1373                 }
1374
1375         if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
1376                 {
1377                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1378                         "krb5_auth_con_setrcache() fails.\n");
1379                 goto err;
1380                 }
1381
1382
1383         /*      kssl_ctx->keytab_file == NULL ==> use Kerberos default
1384         */
1385         if (kssl_ctx->keytab_file)
1386                 {
1387                 krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1388                         &krb5keytab);
1389                 if (krb5rc)
1390                         {
1391                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1392                                 "krb5_kt_resolve() fails.\n");
1393                         goto err;
1394                         }
1395                 }
1396         else
1397                 {
1398                 krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1399                 if (krb5rc)
1400                         {
1401                         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1402                                 "krb5_kt_default() fails.\n");
1403                         goto err;
1404                         }
1405                 }
1406
1407         /*      Actual Kerberos5 krb5_recvauth() has initial conversation here
1408         **      o       check KRB5_SENDAUTH_BADAUTHVERS
1409         **              unless KRB5_RECVAUTH_SKIP_VERSION
1410         **      o       check KRB5_SENDAUTH_BADAPPLVERS
1411         **      o       send "0" msg if all OK
1412         */
1413
1414         /*  20010411 was using AP_REQ instead of true KerberosWrapper
1415         **
1416         **  if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1417         **                      &krb5in_data, krb5server, krb5keytab,
1418         **                      &ap_option, &krb5ticket)) != 0)  { Error }
1419         */
1420
1421         p = (unsigned char *)indata->data;
1422         if ((asn1ticket = (KRB5_TKTBODY *) d2i_KRB5_TICKET(NULL, &p,
1423                                                 (long) indata->length)) == NULL)
1424                 {
1425                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1426                         "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1427                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1428                 goto err;
1429                 }
1430
1431         /* Was:  krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0) */
1432         if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1433                                         kssl_err)) != 0)
1434                 {
1435                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1436                         "Error converting ASN.1 ticket to krb5_ticket.\n");
1437                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1438                 goto err;
1439                 }
1440
1441         if (! krb5_principal_compare(krb5context, krb5server,
1442                                                   krb5ticket->server))  {
1443                 krb5rc = KRB5_PRINC_NOMATCH;
1444                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1445                         "server principal != ticket principal\n");
1446                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1447                 goto err;
1448                 }
1449         if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1450                         krb5ticket->server, krb5ticket->enc_part.kvno,
1451                         krb5ticket->enc_part.enctype, &kt_entry)) != 0)  {
1452                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1453                         "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1454                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1455                 goto err;
1456                 }
1457         if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1458                         krb5ticket)) != 0)  {
1459                 BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1460                         "krb5_decrypt_tkt_part() failed.\n");
1461                 kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1462                 goto err;
1463                 }
1464         else  {
1465                 krb5_kt_free_entry(krb5context, &kt_entry);
1466 #ifdef KSSL_DEBUG
1467                 {
1468                 int i; krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1469                 printf("Decrypted ticket fields:\n");
1470                 printf("\tflags: %X, transit-type: %X",
1471                         krb5ticket->enc_part2->flags,
1472                         krb5ticket->enc_part2->transited.tr_type);
1473                 print_krb5_data("\ttransit-data: ",
1474                         &(krb5ticket->enc_part2->transited.tr_contents));
1475                 printf("\tcaddrs: %p, authdata: %p\n",
1476                         krb5ticket->enc_part2->caddrs,
1477                         krb5ticket->enc_part2->authorization_data);
1478                 if (paddr)
1479                         {
1480                         printf("\tcaddrs:\n");
1481                         for (i=0; paddr[i] != NULL; i++)
1482                                 {
1483                                 krb5_data d;
1484                                 d.length=paddr[i]->length;
1485                                 d.data=paddr[i]->contents;
1486                                 print_krb5_data("\t\tIP: ", &d);
1487                                 }
1488                         }
1489                 printf("\tstart/auth/end times: %d / %d / %d\n",
1490                         krb5ticket->enc_part2->times.starttime,
1491                         krb5ticket->enc_part2->times.authtime,
1492                         krb5ticket->enc_part2->times.endtime);
1493                 }
1494 #endif  /* KSSL_DEBUG */
1495                 }
1496
1497         krb5rc = KRB5_NO_TKT_SUPPLIED;
1498         if (!krb5ticket  ||     !krb5ticket->enc_part2  ||
1499                 !krb5ticket->enc_part2->client  ||
1500                 !krb5ticket->enc_part2->client->data  ||
1501                 !krb5ticket->enc_part2->session)
1502                 {
1503                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1504                         "bad ticket from krb5_rd_req.\n");
1505                 }
1506         else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1507                  &krb5ticket->enc_part2->client->realm,
1508                  krb5ticket->enc_part2->client->data,
1509                  krb5ticket->enc_part2->client->length))
1510                 {
1511                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1512                         "kssl_ctx_setprinc() fails.\n");
1513                 }
1514         else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session))
1515                 {
1516                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1517                         "kssl_ctx_setkey() fails.\n");
1518                 }
1519         else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID)
1520                 {
1521                 krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1522                 kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1523                         "invalid ticket from krb5_rd_req.\n");
1524                 }
1525         else    krb5rc = 0;
1526
1527         kssl_ctx->enctype       = krb5ticket->enc_part.enctype;
1528         ttimes->authtime        = krb5ticket->enc_part2->times.authtime;
1529         ttimes->starttime       = krb5ticket->enc_part2->times.starttime;
1530         ttimes->endtime         = krb5ticket->enc_part2->times.endtime;
1531         ttimes->renew_till      = krb5ticket->enc_part2->times.renew_till;
1532
1533  err:
1534 #ifdef KSSL_DEBUG
1535         kssl_ctx_show(kssl_ctx);
1536 #endif  /* KSSL_DEBUG */
1537
1538         if (asn1ticket)         KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1539         if (krb5keytab)         krb5_kt_close(krb5context, krb5keytab);
1540         if (krb5ticket)         krb5_free_ticket(krb5context, krb5ticket);
1541         if (krb5server)         krb5_free_principal(krb5context, krb5server);
1542         return (krb5rc);
1543         }
1544
1545
1546 /*      Allocate & return a new kssl_ctx struct.
1547 */
1548 KSSL_CTX        *
1549 kssl_ctx_new(void)
1550         {
1551         return ((KSSL_CTX *) calloc(1, sizeof(KSSL_CTX)));
1552         }
1553
1554
1555 /*      Frees a kssl_ctx struct and any allocated memory it holds.
1556 **      Returns NULL.
1557 */
1558 KSSL_CTX        *
1559 kssl_ctx_free(KSSL_CTX *kssl_ctx)
1560         {
1561         if (kssl_ctx == NULL)  return kssl_ctx;
1562
1563         if (kssl_ctx->key)              OPENSSL_cleanse(kssl_ctx->key,
1564                                                               kssl_ctx->length);
1565         if (kssl_ctx->key)              free(kssl_ctx->key);
1566         if (kssl_ctx->client_princ)     free(kssl_ctx->client_princ);
1567         if (kssl_ctx->service_host)     free(kssl_ctx->service_host);
1568         if (kssl_ctx->service_name)     free(kssl_ctx->service_name);
1569         if (kssl_ctx->keytab_file)      free(kssl_ctx->keytab_file);
1570
1571         free(kssl_ctx);
1572         return (KSSL_CTX *) NULL;
1573         }
1574
1575
1576 /*      Given an array of (krb5_data *) entity (and optional realm),
1577 **      set the plain (char *) client_princ or service_host member
1578 **      of the kssl_ctx struct.
1579 */
1580 krb5_error_code
1581 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1582         krb5_data *realm, krb5_data *entity, int nentities)
1583         {
1584         char    **princ;
1585         int     length;
1586         int i;
1587
1588         if (kssl_ctx == NULL  ||  entity == NULL)  return KSSL_CTX_ERR;
1589
1590         switch (which)
1591                 {
1592         case KSSL_CLIENT:       princ = &kssl_ctx->client_princ;        break;
1593         case KSSL_SERVER:       princ = &kssl_ctx->service_host;        break;
1594         default:                return KSSL_CTX_ERR;                    break;
1595                 }
1596         if (*princ)  free(*princ);
1597
1598         /* Add up all the entity->lengths */
1599         length = 0;
1600         for (i=0; i < nentities; i++)
1601                 {
1602                 length += entity[i].length;
1603                 }
1604         /* Add in space for the '/' character(s) (if any) */
1605         length += nentities-1;
1606         /* Space for the ('@'+realm+NULL | NULL) */
1607         length += ((realm)? realm->length + 2: 1);
1608
1609         if ((*princ = calloc(1, length)) == NULL)
1610                 return KSSL_CTX_ERR;
1611         else
1612                 {
1613                 for (i = 0; i < nentities; i++)
1614                         {
1615                         strncat(*princ, entity[i].data, entity[i].length);
1616                         if (i < nentities-1)
1617                                 {
1618                                 strcat (*princ, "/");
1619                                 }
1620                         }
1621                 if (realm)
1622                         {
1623                         strcat (*princ, "@");
1624                         (void) strncat(*princ, realm->data, realm->length);
1625                         }
1626                 }
1627
1628         return KSSL_CTX_OK;
1629         }
1630
1631
1632 /*      Set one of the plain (char *) string members of the kssl_ctx struct.
1633 **      Default values should be:
1634 **              which == KSSL_SERVICE   =>      "khost" (KRB5SVC)
1635 **              which == KSSL_KEYTAB    =>      "/etc/krb5.keytab" (KRB5KEYTAB)
1636 */
1637 krb5_error_code
1638 kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1639         {
1640         char    **string;
1641
1642         if (!kssl_ctx)  return KSSL_CTX_ERR;
1643
1644         switch (which)
1645                 {
1646         case KSSL_SERVICE:      string = &kssl_ctx->service_name;       break;
1647         case KSSL_SERVER:       string = &kssl_ctx->service_host;       break;
1648         case KSSL_CLIENT:       string = &kssl_ctx->client_princ;       break;
1649         case KSSL_KEYTAB:       string = &kssl_ctx->keytab_file;        break;
1650         default:                return KSSL_CTX_ERR;                    break;
1651                 }
1652         if (*string)  free(*string);
1653
1654         if (!text)
1655                 {
1656                 *string = '\0';
1657                 return KSSL_CTX_OK;
1658                 }
1659
1660         if ((*string = calloc(1, strlen(text) + 1)) == NULL)
1661                 return KSSL_CTX_ERR;
1662         else
1663                 strcpy(*string, text);
1664
1665         return KSSL_CTX_OK;
1666         }
1667
1668
1669 /*      Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1670 **      struct.  Clear kssl_ctx->key if Kerberos session key is NULL.
1671 */
1672 krb5_error_code
1673 kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1674         {
1675         int             length;
1676         krb5_enctype    enctype;
1677         krb5_octet FAR  *contents = NULL;
1678
1679         if (!kssl_ctx)  return KSSL_CTX_ERR;
1680
1681         if (kssl_ctx->key)
1682                 {
1683                 OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
1684                 free(kssl_ctx->key);
1685                 }
1686
1687         if (session)
1688                 {
1689
1690 #ifdef KRB5_HEIMDAL
1691                 length = session->keyvalue->length;
1692                 enctype = session->keytype;
1693                 contents = session->keyvalue->contents;
1694 #else
1695                 length = session->length;
1696                 enctype = session->enctype;
1697                 contents = session->contents;
1698 #endif
1699                 kssl_ctx->enctype = enctype;
1700                 kssl_ctx->length  = length;
1701                 }
1702         else
1703                 {
1704                 kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1705                 kssl_ctx->length  = 0;
1706                 return KSSL_CTX_OK;
1707                 }
1708
1709         if ((kssl_ctx->key =
1710                 (krb5_octet FAR *) calloc(1, kssl_ctx->length)) == NULL)
1711                 {
1712                 kssl_ctx->length  = 0;
1713                 return KSSL_CTX_ERR;
1714                 }
1715         else
1716                 memcpy(kssl_ctx->key, contents, length);
1717
1718         return KSSL_CTX_OK;
1719         }
1720
1721
1722 /*      Display contents of kssl_ctx struct
1723 */
1724 void
1725 kssl_ctx_show(KSSL_CTX *kssl_ctx)
1726         {
1727         int     i;
1728
1729         printf("kssl_ctx: ");
1730         if (kssl_ctx == NULL)
1731                 {
1732                 printf("NULL\n");
1733                 return;
1734                 }
1735         else
1736                 printf("%p\n", (void *)kssl_ctx);
1737
1738         printf("\tservice:\t%s\n",
1739                 (kssl_ctx->service_name)? kssl_ctx->service_name: "NULL");
1740         printf("\tclient:\t%s\n",
1741                 (kssl_ctx->client_princ)? kssl_ctx->client_princ: "NULL");
1742         printf("\tserver:\t%s\n",
1743                 (kssl_ctx->service_host)? kssl_ctx->service_host: "NULL");
1744         printf("\tkeytab:\t%s\n",
1745                 (kssl_ctx->keytab_file)? kssl_ctx->keytab_file: "NULL");
1746         printf("\tkey [%d:%d]:\t",
1747                 kssl_ctx->enctype, kssl_ctx->length);
1748
1749         for (i=0; i < kssl_ctx->length  &&  kssl_ctx->key; i++)
1750                 {
1751                 printf("%02x", kssl_ctx->key[i]);
1752                 }
1753         printf("\n");
1754         return;
1755         }
1756
1757     int
1758     kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1759 {
1760     krb5_context                krb5context = NULL;
1761     krb5_keytab                 krb5keytab = NULL;
1762     krb5_keytab_entry           entry;
1763     krb5_principal              princ = NULL;
1764     krb5_error_code             krb5rc = KRB5KRB_ERR_GENERIC;
1765     int rc = 0;
1766
1767     if ((krb5rc = krb5_init_context(&krb5context)))
1768         return(0);
1769
1770     /*  kssl_ctx->keytab_file == NULL ==> use Kerberos default
1771     */
1772     if (kssl_ctx->keytab_file)
1773     {
1774         krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1775                                   &krb5keytab);
1776         if (krb5rc)
1777             goto exit;
1778     }
1779     else
1780     {
1781         krb5rc = krb5_kt_default(krb5context,&krb5keytab);
1782         if (krb5rc)
1783             goto exit;
1784     }
1785
1786     /* the host key we are looking for */
1787     krb5rc = krb5_sname_to_principal(krb5context, NULL,
1788                                      kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
1789                                      KRB5_NT_SRV_HST, &princ);
1790
1791     krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1792                                 princ,
1793                                 0 /* IGNORE_VNO */,
1794                                 0 /* IGNORE_ENCTYPE */,
1795                                 &entry);
1796     if ( krb5rc == KRB5_KT_NOTFOUND ) {
1797         rc = 1;
1798         goto exit;
1799     } else if ( krb5rc )
1800         goto exit;
1801
1802     krb5_kt_free_entry(krb5context, &entry);
1803     rc = 1;
1804
1805   exit:
1806     if (krb5keytab)     krb5_kt_close(krb5context, krb5keytab);
1807     if (princ)          krb5_free_principal(krb5context, princ);
1808     if (krb5context)    krb5_free_context(krb5context);
1809     return(rc);
1810 }
1811
1812 int
1813 kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1814         {
1815         krb5_error_code         krb5rc = KRB5KRB_ERR_GENERIC;
1816         krb5_context            krb5context = NULL;
1817         krb5_ccache             krb5ccdef = NULL;
1818         krb5_creds              krb5creds, *krb5credsp = NULL;
1819         int                     rc = 0;
1820
1821         memset((char *)&krb5creds, 0, sizeof(krb5creds));
1822
1823         if (!kssl_ctx)
1824             return(0);
1825
1826         if (!kssl_ctx->service_host)
1827             return(0);
1828
1829         if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1830             goto err;
1831
1832         if ((krb5rc = krb5_sname_to_principal(krb5context,
1833                                               kssl_ctx->service_host,
1834                                               (kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
1835                                               KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
1836             goto err;
1837
1838         if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1839             goto err;
1840
1841         if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1842                                              &krb5creds.client)) != 0)
1843             goto err;
1844
1845         if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1846                                             &krb5creds, &krb5credsp)) != 0)
1847             goto err;
1848
1849         rc = 1;
1850
1851       err:
1852 #ifdef KSSL_DEBUG
1853         kssl_ctx_show(kssl_ctx);
1854 #endif  /* KSSL_DEBUG */
1855
1856         if (krb5creds.client)   krb5_free_principal(krb5context, krb5creds.client);
1857         if (krb5creds.server)   krb5_free_principal(krb5context, krb5creds.server);
1858         if (krb5context)        krb5_free_context(krb5context);
1859         return(rc);
1860         }
1861
1862 #if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1863 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1864         {
1865 #ifdef KRB5_HEIMDAL
1866         data->length = 0;
1867         if (data->data)
1868             free(data->data);
1869 #elif defined(KRB5_MIT_OLD11)
1870         if (data->data)  {
1871                 krb5_xfree(data->data);
1872                 data->data = 0;
1873                 }
1874 #else
1875         krb5_free_data_contents(NULL, data);
1876 #endif
1877         }
1878 #endif /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1879
1880
1881 /*  Given pointers to KerberosTime and struct tm structs, convert the
1882 **  KerberosTime string to struct tm.  Note that KerberosTime is a
1883 **  ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional
1884 **  seconds as defined in RFC 1510.
1885 **  Return pointer to the (partially) filled in struct tm on success,
1886 **  return NULL on failure.
1887 */
1888 struct tm       *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
1889         {
1890         char            c, *p;
1891
1892         if (!k_tm)  return NULL;
1893         if (gtime == NULL  ||  gtime->length < 14)  return NULL;
1894         if (gtime->data == NULL)  return NULL;
1895
1896         p = (char *)&gtime->data[14];
1897
1898         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_sec  = atoi(p);      *(p+2) = c;
1899         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_min  = atoi(p);      *(p+2) = c;
1900         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_hour = atoi(p);      *(p+2) = c;
1901         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mday = atoi(p);      *(p+2) = c;
1902         c = *p;  *p = '\0';  p -= 2;  k_tm->tm_mon  = atoi(p)-1;    *(p+2) = c;
1903         c = *p;  *p = '\0';  p -= 4;  k_tm->tm_year = atoi(p)-1900; *(p+4) = c;
1904
1905         return k_tm;
1906         }
1907
1908
1909 /*  Helper function for kssl_validate_times().
1910 **  We need context->clockskew, but krb5_context is an opaque struct.
1911 **  So we try to sneek the clockskew out through the replay cache.
1912 **      If that fails just return a likely default (300 seconds).
1913 */
1914 krb5_deltat     get_rc_clockskew(krb5_context context)
1915         {
1916         krb5_rcache     rc;
1917         krb5_deltat     clockskew;
1918
1919         if (krb5_rc_default(context, &rc))  return KSSL_CLOCKSKEW;
1920         if (krb5_rc_initialize(context, rc, 0))  return KSSL_CLOCKSKEW;
1921         if (krb5_rc_get_lifespan(context, rc, &clockskew))  {
1922                 clockskew = KSSL_CLOCKSKEW;
1923                 }
1924         (void) krb5_rc_destroy(context, rc);
1925         return clockskew;
1926         }
1927
1928
1929 /*  kssl_validate_times() combines (and more importantly exposes)
1930 **  the MIT KRB5 internal function krb5_validate_times() and the
1931 **  in_clock_skew() macro.  The authenticator client time is checked
1932 **  to be within clockskew secs of the current time and the current
1933 **  time is checked to be within the ticket start and expire times.
1934 **  Either check may be omitted by supplying a NULL value.
1935 **  Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.
1936 **  See Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c
1937 **  20010420 VRS
1938 */
1939 krb5_error_code  kssl_validate_times(   krb5_timestamp atime,
1940                                         krb5_ticket_times *ttimes)
1941         {
1942         krb5_deltat     skew;
1943         krb5_timestamp  start, now;
1944         krb5_error_code rc;
1945         krb5_context    context;
1946
1947         if ((rc = krb5_init_context(&context)))  return SSL_R_KRB5_S_BAD_TICKET;
1948         skew = get_rc_clockskew(context);
1949         if ((rc = krb5_timeofday(context,&now))) return SSL_R_KRB5_S_BAD_TICKET;
1950         krb5_free_context(context);
1951
1952         if (atime  &&  labs(atime - now) >= skew)  return SSL_R_KRB5_S_TKT_SKEW;
1953
1954         if (! ttimes)  return 0;
1955
1956         start = (ttimes->starttime != 0)? ttimes->starttime: ttimes->authtime;
1957         if (start - now > skew)  return SSL_R_KRB5_S_TKT_NYV;
1958         if ((now - ttimes->endtime) > skew)  return SSL_R_KRB5_S_TKT_EXPIRED;
1959
1960 #ifdef KSSL_DEBUG
1961         printf("kssl_validate_times: %d |<-  | %d - %d | < %d  ->| %d\n",
1962                 start, atime, now, skew, ttimes->endtime);
1963 #endif  /* KSSL_DEBUG */
1964
1965         return 0;
1966         }
1967
1968
1969 /*  Decode and decrypt given DER-encoded authenticator, then pass
1970 **  authenticator ctime back in *atimep (or 0 if time unavailable).
1971 **  Returns krb5_error_code and kssl_err on error.  A NULL
1972 **  authenticator (authentp->length == 0) is not considered an error.
1973 **  Note that kssl_check_authent() makes use of the KRB5 session key;
1974 **  you must call kssl_sget_tkt() to get the key before calling this routine.
1975 */
1976 krb5_error_code  kssl_check_authent(
1977                         /* IN     */    KSSL_CTX        *kssl_ctx,
1978                         /* IN     */    krb5_data       *authentp,
1979                         /* OUT    */    krb5_timestamp  *atimep,
1980                         /* OUT    */    KSSL_ERR        *kssl_err  )
1981         {
1982         krb5_error_code         krb5rc = 0;
1983         KRB5_ENCDATA            *dec_authent = NULL;
1984         KRB5_AUTHENTBODY        *auth = NULL;
1985         krb5_enctype            enctype;
1986         EVP_CIPHER_CTX          ciph_ctx;
1987         const EVP_CIPHER        *enc = NULL;
1988         unsigned char           iv[EVP_MAX_IV_LENGTH];
1989         const unsigned char     *p;
1990         unsigned char           *unenc_authent;
1991         int                     outl, unencbufsize;
1992         struct tm               tm_time, *tm_l, *tm_g;
1993         time_t                  now, tl, tg, tr, tz_offset;
1994
1995         EVP_CIPHER_CTX_init(&ciph_ctx);
1996         *atimep = 0;
1997         kssl_err_set(kssl_err, 0, "");
1998
1999 #ifndef KRB5CHECKAUTH
2000         authentp = NULL;
2001 #else
2002 #if     KRB5CHECKAUTH == 0
2003         authentp = NULL;
2004 #endif
2005 #endif  /* KRB5CHECKAUTH */
2006
2007         if (authentp == NULL  ||  authentp->length == 0)  return 0;
2008
2009 #ifdef KSSL_DEBUG
2010         {
2011         unsigned int ui;
2012         printf("kssl_check_authent: authenticator[%d]:\n",authentp->length);
2013         p = authentp->data;
2014         for (ui=0; ui < authentp->length; ui++)  printf("%02x ",p[ui]);
2015         printf("\n");
2016         }
2017 #endif  /* KSSL_DEBUG */
2018
2019         unencbufsize = 2 * authentp->length;
2020         if ((unenc_authent = calloc(1, unencbufsize)) == NULL)
2021                 {
2022                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2023                         "Unable to allocate authenticator buffer.\n");
2024                 krb5rc = KRB5KRB_ERR_GENERIC;
2025                 goto err;
2026                 }
2027
2028         p = (unsigned char *)authentp->data;
2029         if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
2030                                         (long) authentp->length)) == NULL)
2031                 {
2032                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2033                         "Error decoding authenticator.\n");
2034                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2035                 goto err;
2036                 }
2037
2038         enctype = dec_authent->etype->data[0];  /* should = kssl_ctx->enctype */
2039 #if !defined(KRB5_MIT_OLD11)
2040             switch ( enctype ) {
2041             case ENCTYPE_DES3_CBC_SHA1:         /*    EVP_des_ede3_cbc();  */
2042             case ENCTYPE_DES3_CBC_SHA:
2043             case ENCTYPE_DES3_CBC_RAW:
2044                 krb5rc = 0;                     /* Skip, can't handle derived keys */
2045                 goto err;
2046             }
2047 #endif
2048         enc = kssl_map_enc(enctype);
2049         memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2050
2051         if (enc == NULL)
2052                 {
2053                 /*  Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.
2054                 **  This enctype indicates the authenticator was encrypted
2055                 **  using key-usage derived keys which openssl cannot decrypt.
2056                 */
2057                 goto err;
2058                 }
2059
2060         if (!EVP_CipherInit(&ciph_ctx,enc,kssl_ctx->key,iv,0))
2061                 {
2062                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2063                         "EVP_CipherInit error decrypting authenticator.\n");
2064                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2065                 goto err;
2066                 }
2067         outl = dec_authent->cipher->length;
2068         if (!EVP_Cipher(&ciph_ctx,unenc_authent,dec_authent->cipher->data,outl))
2069                 {
2070                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2071                         "EVP_Cipher error decrypting authenticator.\n");
2072                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2073                 goto err;
2074                 }
2075         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2076
2077 #ifdef KSSL_DEBUG
2078         printf("kssl_check_authent: decrypted authenticator[%d] =\n", outl);
2079         for (padl=0; padl < outl; padl++) printf("%02x ",unenc_authent[padl]);
2080         printf("\n");
2081 #endif  /* KSSL_DEBUG */
2082
2083         if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL)
2084                 {
2085                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2086                         "confounded by authenticator.\n");
2087                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2088                 goto err;
2089                 }
2090         outl -= p - unenc_authent;
2091
2092         if ((auth = (KRB5_AUTHENTBODY *) d2i_KRB5_AUTHENT(NULL, &p,
2093                                                           (long) outl))==NULL)
2094                 {
2095                 kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2096                         "Error decoding authenticator body.\n");
2097                 krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2098                 goto err;
2099                 }
2100
2101         memset(&tm_time,0,sizeof(struct tm));
2102         if (k_gmtime(auth->ctime, &tm_time)  &&
2103                 ((tr = mktime(&tm_time)) != (time_t)(-1)))
2104                 {
2105                 now  = time(&now);
2106                 tm_l = localtime(&now);         tl = mktime(tm_l);
2107                 tm_g = gmtime(&now);            tg = mktime(tm_g);
2108                 tz_offset = tg - tl;
2109
2110                 *atimep = tr - tz_offset;
2111                 }
2112
2113 #ifdef KSSL_DEBUG
2114         printf("kssl_check_authent: returns %d for client time ", *atimep);
2115         if (auth && auth->ctime && auth->ctime->length && auth->ctime->data)
2116                 printf("%.*s\n", auth->ctime->length, auth->ctime->data);
2117         else    printf("NULL\n");
2118 #endif  /* KSSL_DEBUG */
2119
2120  err:
2121         if (auth)               KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2122         if (dec_authent)        KRB5_ENCDATA_free(dec_authent);
2123         if (unenc_authent)      free(unenc_authent);
2124         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2125         return krb5rc;
2126         }
2127
2128
2129 /*  Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2130 **  because I dont't know how to stub varargs.
2131 **  Returns krb5_error_code == ENOMEM on alloc error, otherwise
2132 **  passes back newly constructed principal, which should be freed by caller.
2133 */
2134 krb5_error_code  kssl_build_principal_2(
2135                         /* UPDATE */    krb5_context    context,
2136                         /* OUT    */    krb5_principal  *princ,
2137                         /* IN     */    int rlen,  const char *realm,
2138                         /* IN     */    int slen,  const char *svc,
2139                         /* IN     */    int hlen,  const char *host)
2140         {
2141         krb5_data               *p_data = NULL;
2142         krb5_principal          new_p = NULL;
2143         char                    *new_r = NULL;
2144
2145         if ((p_data = (krb5_data *) calloc(2, sizeof(krb5_data))) == NULL  ||
2146             (new_p = (krb5_principal) calloc(1, sizeof(krb5_principal_data)))
2147                         == NULL)  goto err;
2148         new_p->length = 2;
2149         new_p->data = p_data;
2150
2151         if ((new_r = calloc(1, rlen + 1)) == NULL)  goto err;
2152         memcpy(new_r, realm, rlen);
2153         krb5_princ_set_realm_length(context, new_p, rlen);
2154         krb5_princ_set_realm_data(context, new_p, new_r);
2155
2156         if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL)  goto err;
2157         memcpy(new_p->data[0].data, svc, slen);
2158         new_p->data[0].length = slen;
2159
2160         if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL)  goto err;
2161         memcpy(new_p->data[1].data, host, hlen);
2162         new_p->data[1].length = hlen;
2163
2164         krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2165         *princ = new_p;
2166         return 0;
2167
2168  err:
2169         if (new_p  &&  new_p[0].data)   free(new_p[0].data);
2170         if (new_p  &&  new_p[1].data)   free(new_p[1].data);
2171         if (new_p)      free(new_p);
2172         if (new_r)      free(new_r);
2173         return ENOMEM;
2174         }
2175
2176
2177 #else /* !OPENSSL_NO_KRB5 */
2178
2179 #if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2180 static void *dummy=&dummy;
2181 #endif
2182
2183 #endif  /* !OPENSSL_NO_KRB5     */
2184