ssl/kssl.c

   1 /* ssl/kssl.c -*- mode: C; c-file-style: "eay" -*- */
   2 /*
   3  * Written by Vern Staats <staatsvr@asc.hpc.mil> for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 /*-
  61  * ssl/kssl.c  --  Routines to support (& debug) Kerberos5 auth for openssl
  62  *
  63  *  19990701    VRS     Started.
  64  *  200011??    Jeffrey Altman, Richard Levitte
  65  *                      Generalized for Heimdal, Newer MIT, & Win32.
  66  *                      Integrated into main OpenSSL 0.9.7 snapshots.
  67  *  20010413    Simon Wilkinson, VRS
  68  *                      Real RFC2712 KerberosWrapper replaces AP_REQ.
  69  */
  70
  71 #include <openssl/opensslconf.h>
  72
  73 #include <string.h>
  74
  75 #define KRB5_PRIVATE    1
  76
  77 #include <openssl/ssl.h>
  78 #include <openssl/evp.h>
  79 #include <openssl/objects.h>
  80 #include <openssl/krb5_asn.h>
  81 #include "kssl_lcl.h"
  82 #include "ssl_locl.h"
  83
  84 #ifndef OPENSSL_NO_KRB5
  85
  86 # ifndef ENOMEM
  87 #  define ENOMEM KRB5KRB_ERR_GENERIC
  88 # endif
  89
  90 /*
  91  * When OpenSSL is built on Windows, we do not want to require that
  92  * the Kerberos DLLs be available in order for the OpenSSL DLLs to
  93  * work.  Therefore, all Kerberos routines are loaded at run time
  94  * and we do not link to a .LIB file.
  95  */
  96
  97 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
  98 /*
  99  * The purpose of the following pre-processor statements is to provide
 100  * compatibility with different releases of MIT Kerberos for Windows.
 101  * All versions up to 1.2 used macros.  But macros do not allow for
 102  * a binary compatible interface for DLLs.  Therefore, all macros are
 103  * being replaced by function calls.  The following code will allow
 104  * an OpenSSL DLL built on Windows to work whether or not the macro
 105  * or function form of the routines are utilized.
 106  */
 107 #  ifdef  krb5_cc_get_principal
 108 #   define NO_DEF_KRB5_CCACHE
 109 #   undef  krb5_cc_get_principal
 110 #  endif
 111 #  define krb5_cc_get_principal    kssl_krb5_cc_get_principal
 112
 113 #  define krb5_free_data_contents  kssl_krb5_free_data_contents
 114 #  define krb5_free_context        kssl_krb5_free_context
 115 #  define krb5_auth_con_free       kssl_krb5_auth_con_free
 116 #  define krb5_free_principal      kssl_krb5_free_principal
 117 #  define krb5_mk_req_extended     kssl_krb5_mk_req_extended
 118 #  define krb5_get_credentials     kssl_krb5_get_credentials
 119 #  define krb5_cc_default          kssl_krb5_cc_default
 120 #  define krb5_sname_to_principal  kssl_krb5_sname_to_principal
 121 #  define krb5_init_context        kssl_krb5_init_context
 122 #  define krb5_free_ticket         kssl_krb5_free_ticket
 123 #  define krb5_rd_req              kssl_krb5_rd_req
 124 #  define krb5_kt_default          kssl_krb5_kt_default
 125 #  define krb5_kt_resolve          kssl_krb5_kt_resolve
 126 /* macros in mit 1.2.2 and earlier; functions in mit 1.2.3 and greater */
 127 #  ifndef krb5_kt_close
 128 #   define krb5_kt_close            kssl_krb5_kt_close
 129 #  endif                        /* krb5_kt_close */
 130 #  ifndef krb5_kt_get_entry
 131 #   define krb5_kt_get_entry        kssl_krb5_kt_get_entry
 132 #  endif                        /* krb5_kt_get_entry */
 133 #  define krb5_auth_con_init       kssl_krb5_auth_con_init
 134
 135 #  define krb5_principal_compare   kssl_krb5_principal_compare
 136 #  define krb5_decrypt_tkt_part    kssl_krb5_decrypt_tkt_part
 137 #  define krb5_timeofday           kssl_krb5_timeofday
 138 #  define krb5_rc_default          kssl_krb5_rc_default
 139
 140 #  ifdef krb5_rc_initialize
 141 #   undef krb5_rc_initialize
 142 #  endif
 143 #  define krb5_rc_initialize   kssl_krb5_rc_initialize
 144
 145 #  ifdef krb5_rc_get_lifespan
 146 #   undef krb5_rc_get_lifespan
 147 #  endif
 148 #  define krb5_rc_get_lifespan kssl_krb5_rc_get_lifespan
 149
 150 #  ifdef krb5_rc_destroy
 151 #   undef krb5_rc_destroy
 152 #  endif
 153 #  define krb5_rc_destroy      kssl_krb5_rc_destroy
 154
 155 #  define valid_cksumtype      kssl_valid_cksumtype
 156 #  define krb5_checksum_size   kssl_krb5_checksum_size
 157 #  define krb5_kt_free_entry   kssl_krb5_kt_free_entry
 158 #  define krb5_auth_con_setrcache  kssl_krb5_auth_con_setrcache
 159 #  define krb5_auth_con_getrcache  kssl_krb5_auth_con_getrcache
 160 #  define krb5_get_server_rcache   kssl_krb5_get_server_rcache
 161
 162 /* Prototypes for built in stubs */
 163 void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
 164 void kssl_krb5_free_principal(krb5_context, krb5_principal);
 165 krb5_error_code kssl_krb5_kt_resolve(krb5_context,
 166                                      krb5_const char *, krb5_keytab *);
 167 krb5_error_code kssl_krb5_kt_default(krb5_context, krb5_keytab *);
 168 krb5_error_code kssl_krb5_free_ticket(krb5_context, krb5_ticket *);
 169 krb5_error_code kssl_krb5_rd_req(krb5_context, krb5_auth_context *,
 170                                  krb5_const krb5_data *,
 171                                  krb5_const_principal, krb5_keytab,
 172                                  krb5_flags *, krb5_ticket **);
 173
 174 krb5_boolean kssl_krb5_principal_compare(krb5_context, krb5_const_principal,
 175                                          krb5_const_principal);
 176 krb5_error_code kssl_krb5_mk_req_extended(krb5_context,
 177                                           krb5_auth_context *,
 178                                           krb5_const krb5_flags,
 179                                           krb5_data *,
 180                                           krb5_creds *, krb5_data *);
 181 krb5_error_code kssl_krb5_init_context(krb5_context *);
 182 void kssl_krb5_free_context(krb5_context);
 183 krb5_error_code kssl_krb5_cc_default(krb5_context, krb5_ccache *);
 184 krb5_error_code kssl_krb5_sname_to_principal(krb5_context,
 185                                              krb5_const char *,
 186                                              krb5_const char *,
 187                                              krb5_int32, krb5_principal *);
 188 krb5_error_code kssl_krb5_get_credentials(krb5_context,
 189                                           krb5_const krb5_flags,
 190                                           krb5_ccache,
 191                                           krb5_creds *, krb5_creds * *);
 192 krb5_error_code kssl_krb5_auth_con_init(krb5_context, krb5_auth_context *);
 193 krb5_error_code kssl_krb5_cc_get_principal(krb5_context context,
 194                                            krb5_ccache cache,
 195                                            krb5_principal *principal);
 196 krb5_error_code kssl_krb5_auth_con_free(krb5_context, krb5_auth_context);
 197 size_t kssl_krb5_checksum_size(krb5_context context, krb5_cksumtype ctype);
 198 krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
 199 krb5_error_code krb5_kt_free_entry(krb5_context, krb5_keytab_entry FAR *);
 200 krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context,
 201                                              krb5_auth_context, krb5_rcache);
 202 krb5_error_code kssl_krb5_get_server_rcache(krb5_context,
 203                                             krb5_const krb5_data *,
 204                                             krb5_rcache *);
 205 krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context,
 206                                              krb5_auth_context,
 207                                              krb5_rcache *);
 208
 209 /* Function pointers (almost all Kerberos functions are _stdcall) */
 210 static void (_stdcall *p_krb5_free_data_contents) (krb5_context, krb5_data *)
 211     = NULL;
 212 static void (_stdcall *p_krb5_free_principal) (krb5_context, krb5_principal)
 213     = NULL;
 214 static krb5_error_code(_stdcall *p_krb5_kt_resolve)
 215  (krb5_context, krb5_const char *, krb5_keytab *) = NULL;
 216 static krb5_error_code(_stdcall *p_krb5_kt_default) (krb5_context,
 217                                                      krb5_keytab *) = NULL;
 218 static krb5_error_code(_stdcall *p_krb5_free_ticket) (krb5_context,
 219                                                       krb5_ticket *) = NULL;
 220 static krb5_error_code(_stdcall *p_krb5_rd_req) (krb5_context,
 221                                                  krb5_auth_context *,
 222                                                  krb5_const krb5_data *,
 223                                                  krb5_const_principal,
 224                                                  krb5_keytab, krb5_flags *,
 225                                                  krb5_ticket **) = NULL;
 226 static krb5_error_code(_stdcall *p_krb5_mk_req_extended)
 227  (krb5_context, krb5_auth_context *,
 228   krb5_const krb5_flags, krb5_data *, krb5_creds *, krb5_data *) = NULL;
 229 static krb5_error_code(_stdcall *p_krb5_init_context) (krb5_context *) = NULL;
 230 static void (_stdcall *p_krb5_free_context) (krb5_context) = NULL;
 231 static krb5_error_code(_stdcall *p_krb5_cc_default) (krb5_context,
 232                                                      krb5_ccache *) = NULL;
 233 static krb5_error_code(_stdcall *p_krb5_sname_to_principal)
 234  (krb5_context, krb5_const char *, krb5_const char *,
 235   krb5_int32, krb5_principal *) = NULL;
 236 static krb5_error_code(_stdcall *p_krb5_get_credentials)
 237  (krb5_context, krb5_const krb5_flags, krb5_ccache,
 238   krb5_creds *, krb5_creds **) = NULL;
 239 static krb5_error_code(_stdcall *p_krb5_auth_con_init)
 240  (krb5_context, krb5_auth_context *) = NULL;
 241 static krb5_error_code(_stdcall *p_krb5_cc_get_principal)
 242  (krb5_context context, krb5_ccache cache, krb5_principal *principal) = NULL;
 243 static krb5_error_code(_stdcall *p_krb5_auth_con_free)
 244  (krb5_context, krb5_auth_context) = NULL;
 245 static krb5_error_code(_stdcall *p_krb5_decrypt_tkt_part)
 246  (krb5_context, krb5_const krb5_keyblock *, krb5_ticket *) = NULL;
 247 static krb5_error_code(_stdcall *p_krb5_timeofday)
 248  (krb5_context context, krb5_int32 *timeret) = NULL;
 249 static krb5_error_code(_stdcall *p_krb5_rc_default)
 250  (krb5_context context, krb5_rcache *rc) = NULL;
 251 static krb5_error_code(_stdcall *p_krb5_rc_initialize)
 252  (krb5_context context, krb5_rcache rc, krb5_deltat lifespan) = NULL;
 253 static krb5_error_code(_stdcall *p_krb5_rc_get_lifespan)
 254  (krb5_context context, krb5_rcache rc, krb5_deltat *lifespan) = NULL;
 255 static krb5_error_code(_stdcall *p_krb5_rc_destroy)
 256  (krb5_context context, krb5_rcache rc) = NULL;
 257 static krb5_boolean(_stdcall *p_krb5_principal_compare)
 258  (krb5_context, krb5_const_principal, krb5_const_principal) = NULL;
 259 static size_t (_stdcall *p_krb5_checksum_size) (krb5_context context,
 260                                                 krb5_cksumtype ctype) = NULL;
 261 static krb5_boolean(_stdcall *p_valid_cksumtype) (krb5_cksumtype ctype) =
 262     NULL;
 263 static krb5_error_code(_stdcall *p_krb5_kt_free_entry)
 264  (krb5_context, krb5_keytab_entry *) = NULL;
 265 static krb5_error_code(_stdcall *p_krb5_auth_con_setrcache) (krb5_context,
 266                                                              krb5_auth_context,
 267                                                              krb5_rcache) =
 268     NULL;
 269 static krb5_error_code(_stdcall *p_krb5_get_server_rcache) (krb5_context,
 270                                                             krb5_const
 271                                                             krb5_data *,
 272                                                             krb5_rcache *) =
 273     NULL;
 274 static krb5_error_code(*p_krb5_auth_con_getrcache) (krb5_context,
 275                                                     krb5_auth_context,
 276                                                     krb5_rcache *) = NULL;
 277 static krb5_error_code(_stdcall *p_krb5_kt_close) (krb5_context context,
 278                                                    krb5_keytab keytab) = NULL;
 279 static krb5_error_code(_stdcall *p_krb5_kt_get_entry) (krb5_context context,
 280                                                        krb5_keytab keytab,
 281                                                        krb5_const_principal
 282                                                        principal,
 283                                                        krb5_kvno vno,
 284                                                        krb5_enctype enctype,
 285                                                        krb5_keytab_entry
 286                                                        *entry) = NULL;
 287 static int krb5_loaded = 0;     /* only attempt to initialize func ptrs once */
 288
 289 /* Function to Load the Kerberos 5 DLL and initialize function pointers */
 290 void load_krb5_dll(void)
 291 {
 292     HANDLE hKRB5_32;
 293
 294     krb5_loaded++;
 295     hKRB5_32 = LoadLibrary(TEXT("KRB5_32"));
 296     if (!hKRB5_32)
 297         return;
 298
 299     (FARPROC) p_krb5_free_data_contents =
 300         GetProcAddress(hKRB5_32, "krb5_free_data_contents");
 301     (FARPROC) p_krb5_free_context =
 302         GetProcAddress(hKRB5_32, "krb5_free_context");
 303     (FARPROC) p_krb5_auth_con_free =
 304         GetProcAddress(hKRB5_32, "krb5_auth_con_free");
 305     (FARPROC) p_krb5_free_principal =
 306         GetProcAddress(hKRB5_32, "krb5_free_principal");
 307     (FARPROC) p_krb5_mk_req_extended =
 308         GetProcAddress(hKRB5_32, "krb5_mk_req_extended");
 309     (FARPROC) p_krb5_get_credentials =
 310         GetProcAddress(hKRB5_32, "krb5_get_credentials");
 311     (FARPROC) p_krb5_cc_get_principal =
 312         GetProcAddress(hKRB5_32, "krb5_cc_get_principal");
 313     (FARPROC) p_krb5_cc_default = GetProcAddress(hKRB5_32, "krb5_cc_default");
 314     (FARPROC) p_krb5_sname_to_principal =
 315         GetProcAddress(hKRB5_32, "krb5_sname_to_principal");
 316     (FARPROC) p_krb5_init_context =
 317         GetProcAddress(hKRB5_32, "krb5_init_context");
 318     (FARPROC) p_krb5_free_ticket =
 319         GetProcAddress(hKRB5_32, "krb5_free_ticket");
 320     (FARPROC) p_krb5_rd_req = GetProcAddress(hKRB5_32, "krb5_rd_req");
 321     (FARPROC) p_krb5_principal_compare =
 322         GetProcAddress(hKRB5_32, "krb5_principal_compare");
 323     (FARPROC) p_krb5_decrypt_tkt_part =
 324         GetProcAddress(hKRB5_32, "krb5_decrypt_tkt_part");
 325     (FARPROC) p_krb5_timeofday = GetProcAddress(hKRB5_32, "krb5_timeofday");
 326     (FARPROC) p_krb5_rc_default = GetProcAddress(hKRB5_32, "krb5_rc_default");
 327     (FARPROC) p_krb5_rc_initialize =
 328         GetProcAddress(hKRB5_32, "krb5_rc_initialize");
 329     (FARPROC) p_krb5_rc_get_lifespan =
 330         GetProcAddress(hKRB5_32, "krb5_rc_get_lifespan");
 331     (FARPROC) p_krb5_rc_destroy = GetProcAddress(hKRB5_32, "krb5_rc_destroy");
 332     (FARPROC) p_krb5_kt_default = GetProcAddress(hKRB5_32, "krb5_kt_default");
 333     (FARPROC) p_krb5_kt_resolve = GetProcAddress(hKRB5_32, "krb5_kt_resolve");
 334     (FARPROC) p_krb5_auth_con_init =
 335         GetProcAddress(hKRB5_32, "krb5_auth_con_init");
 336     (FARPROC) p_valid_cksumtype = GetProcAddress(hKRB5_32, "valid_cksumtype");
 337     (FARPROC) p_krb5_checksum_size =
 338         GetProcAddress(hKRB5_32, "krb5_checksum_size");
 339     (FARPROC) p_krb5_kt_free_entry =
 340         GetProcAddress(hKRB5_32, "krb5_kt_free_entry");
 341     (FARPROC) p_krb5_auth_con_setrcache =
 342         GetProcAddress(hKRB5_32, "krb5_auth_con_setrcache");
 343     (FARPROC) p_krb5_get_server_rcache =
 344         GetProcAddress(hKRB5_32, "krb5_get_server_rcache");
 345     (FARPROC) p_krb5_auth_con_getrcache =
 346         GetProcAddress(hKRB5_32, "krb5_auth_con_getrcache");
 347     (FARPROC) p_krb5_kt_close = GetProcAddress(hKRB5_32, "krb5_kt_close");
 348     (FARPROC) p_krb5_kt_get_entry =
 349         GetProcAddress(hKRB5_32, "krb5_kt_get_entry");
 350 }
 351
 352 /* Stubs for each function to be dynamicly loaded */
 353 void kssl_krb5_free_data_contents(krb5_context CO, krb5_data *data)
 354 {
 355     if (!krb5_loaded)
 356         load_krb5_dll();
 357
 358     if (p_krb5_free_data_contents)
 359         p_krb5_free_data_contents(CO, data);
 360 }
 361
 362 krb5_error_code
 363 kssl_krb5_mk_req_extended(krb5_context CO,
 364                           krb5_auth_context *pACO,
 365                           krb5_const krb5_flags F,
 366                           krb5_data *pD1, krb5_creds *pC, krb5_data *pD2)
 367 {
 368     if (!krb5_loaded)
 369         load_krb5_dll();
 370
 371     if (p_krb5_mk_req_extended)
 372         return (p_krb5_mk_req_extended(CO, pACO, F, pD1, pC, pD2));
 373     else
 374         return KRB5KRB_ERR_GENERIC;
 375 }
 376
 377 krb5_error_code
 378 kssl_krb5_auth_con_init(krb5_context CO, krb5_auth_context *pACO)
 379 {
 380     if (!krb5_loaded)
 381         load_krb5_dll();
 382
 383     if (p_krb5_auth_con_init)
 384         return (p_krb5_auth_con_init(CO, pACO));
 385     else
 386         return KRB5KRB_ERR_GENERIC;
 387 }
 388
 389 krb5_error_code
 390 kssl_krb5_auth_con_free(krb5_context CO, krb5_auth_context ACO)
 391 {
 392     if (!krb5_loaded)
 393         load_krb5_dll();
 394
 395     if (p_krb5_auth_con_free)
 396         return (p_krb5_auth_con_free(CO, ACO));
 397     else
 398         return KRB5KRB_ERR_GENERIC;
 399 }
 400
 401 krb5_error_code
 402 kssl_krb5_get_credentials(krb5_context CO,
 403                           krb5_const krb5_flags F,
 404                           krb5_ccache CC, krb5_creds *pCR, krb5_creds **ppCR)
 405 {
 406     if (!krb5_loaded)
 407         load_krb5_dll();
 408
 409     if (p_krb5_get_credentials)
 410         return (p_krb5_get_credentials(CO, F, CC, pCR, ppCR));
 411     else
 412         return KRB5KRB_ERR_GENERIC;
 413 }
 414
 415 krb5_error_code
 416 kssl_krb5_sname_to_principal(krb5_context CO,
 417                              krb5_const char *pC1,
 418                              krb5_const char *pC2,
 419                              krb5_int32 I, krb5_principal *pPR)
 420 {
 421     if (!krb5_loaded)
 422         load_krb5_dll();
 423
 424     if (p_krb5_sname_to_principal)
 425         return (p_krb5_sname_to_principal(CO, pC1, pC2, I, pPR));
 426     else
 427         return KRB5KRB_ERR_GENERIC;
 428 }
 429
 430 krb5_error_code kssl_krb5_cc_default(krb5_context CO, krb5_ccache *pCC)
 431 {
 432     if (!krb5_loaded)
 433         load_krb5_dll();
 434
 435     if (p_krb5_cc_default)
 436         return (p_krb5_cc_default(CO, pCC));
 437     else
 438         return KRB5KRB_ERR_GENERIC;
 439 }
 440
 441 krb5_error_code kssl_krb5_init_context(krb5_context *pCO)
 442 {
 443     if (!krb5_loaded)
 444         load_krb5_dll();
 445
 446     if (p_krb5_init_context)
 447         return (p_krb5_init_context(pCO));
 448     else
 449         return KRB5KRB_ERR_GENERIC;
 450 }
 451
 452 void kssl_krb5_free_context(krb5_context CO)
 453 {
 454     if (!krb5_loaded)
 455         load_krb5_dll();
 456
 457     if (p_krb5_free_context)
 458         p_krb5_free_context(CO);
 459 }
 460
 461 void kssl_krb5_free_principal(krb5_context c, krb5_principal p)
 462 {
 463     if (!krb5_loaded)
 464         load_krb5_dll();
 465
 466     if (p_krb5_free_principal)
 467         p_krb5_free_principal(c, p);
 468 }
 469
 470 krb5_error_code
 471 kssl_krb5_kt_resolve(krb5_context con, krb5_const char *sz, krb5_keytab *kt)
 472 {
 473     if (!krb5_loaded)
 474         load_krb5_dll();
 475
 476     if (p_krb5_kt_resolve)
 477         return (p_krb5_kt_resolve(con, sz, kt));
 478     else
 479         return KRB5KRB_ERR_GENERIC;
 480 }
 481
 482 krb5_error_code kssl_krb5_kt_default(krb5_context con, krb5_keytab *kt)
 483 {
 484     if (!krb5_loaded)
 485         load_krb5_dll();
 486
 487     if (p_krb5_kt_default)
 488         return (p_krb5_kt_default(con, kt));
 489     else
 490         return KRB5KRB_ERR_GENERIC;
 491 }
 492
 493 krb5_error_code kssl_krb5_free_ticket(krb5_context con, krb5_ticket *kt)
 494 {
 495     if (!krb5_loaded)
 496         load_krb5_dll();
 497
 498     if (p_krb5_free_ticket)
 499         return (p_krb5_free_ticket(con, kt));
 500     else
 501         return KRB5KRB_ERR_GENERIC;
 502 }
 503
 504 krb5_error_code
 505 kssl_krb5_rd_req(krb5_context con, krb5_auth_context *pacon,
 506                  krb5_const krb5_data *data,
 507                  krb5_const_principal princ, krb5_keytab keytab,
 508                  krb5_flags *flags, krb5_ticket **pptkt)
 509 {
 510     if (!krb5_loaded)
 511         load_krb5_dll();
 512
 513     if (p_krb5_rd_req)
 514         return (p_krb5_rd_req(con, pacon, data, princ, keytab, flags, pptkt));
 515     else
 516         return KRB5KRB_ERR_GENERIC;
 517 }
 518
 519 krb5_boolean
 520 krb5_principal_compare(krb5_context con, krb5_const_principal princ1,
 521                        krb5_const_principal princ2)
 522 {
 523     if (!krb5_loaded)
 524         load_krb5_dll();
 525
 526     if (p_krb5_principal_compare)
 527         return (p_krb5_principal_compare(con, princ1, princ2));
 528     else
 529         return KRB5KRB_ERR_GENERIC;
 530 }
 531
 532 krb5_error_code
 533 krb5_decrypt_tkt_part(krb5_context con, krb5_const krb5_keyblock *keys,
 534                       krb5_ticket *ticket)
 535 {
 536     if (!krb5_loaded)
 537         load_krb5_dll();
 538
 539     if (p_krb5_decrypt_tkt_part)
 540         return (p_krb5_decrypt_tkt_part(con, keys, ticket));
 541     else
 542         return KRB5KRB_ERR_GENERIC;
 543 }
 544
 545 krb5_error_code krb5_timeofday(krb5_context con, krb5_int32 *timeret)
 546 {
 547     if (!krb5_loaded)
 548         load_krb5_dll();
 549
 550     if (p_krb5_timeofday)
 551         return (p_krb5_timeofday(con, timeret));
 552     else
 553         return KRB5KRB_ERR_GENERIC;
 554 }
 555
 556 krb5_error_code krb5_rc_default(krb5_context con, krb5_rcache *rc)
 557 {
 558     if (!krb5_loaded)
 559         load_krb5_dll();
 560
 561     if (p_krb5_rc_default)
 562         return (p_krb5_rc_default(con, rc));
 563     else
 564         return KRB5KRB_ERR_GENERIC;
 565 }
 566
 567 krb5_error_code
 568 krb5_rc_initialize(krb5_context con, krb5_rcache rc, krb5_deltat lifespan)
 569 {
 570     if (!krb5_loaded)
 571         load_krb5_dll();
 572
 573     if (p_krb5_rc_initialize)
 574         return (p_krb5_rc_initialize(con, rc, lifespan));
 575     else
 576         return KRB5KRB_ERR_GENERIC;
 577 }
 578
 579 krb5_error_code
 580 krb5_rc_get_lifespan(krb5_context con, krb5_rcache rc, krb5_deltat *lifespanp)
 581 {
 582     if (!krb5_loaded)
 583         load_krb5_dll();
 584
 585     if (p_krb5_rc_get_lifespan)
 586         return (p_krb5_rc_get_lifespan(con, rc, lifespanp));
 587     else
 588         return KRB5KRB_ERR_GENERIC;
 589 }
 590
 591 krb5_error_code krb5_rc_destroy(krb5_context con, krb5_rcache rc)
 592 {
 593     if (!krb5_loaded)
 594         load_krb5_dll();
 595
 596     if (p_krb5_rc_destroy)
 597         return (p_krb5_rc_destroy(con, rc));
 598     else
 599         return KRB5KRB_ERR_GENERIC;
 600 }
 601
 602 size_t krb5_checksum_size(krb5_context context, krb5_cksumtype ctype)
 603 {
 604     if (!krb5_loaded)
 605         load_krb5_dll();
 606
 607     if (p_krb5_checksum_size)
 608         return (p_krb5_checksum_size(context, ctype));
 609     else
 610         return KRB5KRB_ERR_GENERIC;
 611 }
 612
 613 krb5_boolean valid_cksumtype(krb5_cksumtype ctype)
 614 {
 615     if (!krb5_loaded)
 616         load_krb5_dll();
 617
 618     if (p_valid_cksumtype)
 619         return (p_valid_cksumtype(ctype));
 620     else
 621         return KRB5KRB_ERR_GENERIC;
 622 }
 623
 624 krb5_error_code krb5_kt_free_entry(krb5_context con, krb5_keytab_entry *entry)
 625 {
 626     if (!krb5_loaded)
 627         load_krb5_dll();
 628
 629     if (p_krb5_kt_free_entry)
 630         return (p_krb5_kt_free_entry(con, entry));
 631     else
 632         return KRB5KRB_ERR_GENERIC;
 633 }
 634
 635 /* Structure definitions  */
 636 #  ifndef NO_DEF_KRB5_CCACHE
 637 #   ifndef krb5_x
 638 #    define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
 639 #    define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
 640 #   endif
 641
 642 typedef krb5_pointer krb5_cc_cursor; /* cursor for sequential lookup */
 643
 644 typedef struct _krb5_ccache {
 645     krb5_magic magic;
 646     struct _krb5_cc_ops FAR *ops;
 647     krb5_pointer data;
 648 } *krb5_ccache;
 649
 650 typedef struct _krb5_cc_ops {
 651     krb5_magic magic;
 652     char *prefix;
 653     char *(KRB5_CALLCONV *get_name)
 654      (krb5_context, krb5_ccache);
 655      krb5_error_code(KRB5_CALLCONV *resolve)
 656      (krb5_context, krb5_ccache *, const char *);
 657      krb5_error_code(KRB5_CALLCONV *gen_new)
 658      (krb5_context, krb5_ccache *);
 659      krb5_error_code(KRB5_CALLCONV *init)
 660      (krb5_context, krb5_ccache, krb5_principal);
 661      krb5_error_code(KRB5_CALLCONV *destroy)
 662      (krb5_context, krb5_ccache);
 663      krb5_error_code(KRB5_CALLCONV *close)
 664      (krb5_context, krb5_ccache);
 665      krb5_error_code(KRB5_CALLCONV *store)
 666      (krb5_context, krb5_ccache, krb5_creds *);
 667      krb5_error_code(KRB5_CALLCONV *retrieve)
 668      (krb5_context, krb5_ccache, krb5_flags, krb5_creds *, krb5_creds *);
 669      krb5_error_code(KRB5_CALLCONV *get_princ)
 670      (krb5_context, krb5_ccache, krb5_principal *);
 671      krb5_error_code(KRB5_CALLCONV *get_first)
 672      (krb5_context, krb5_ccache, krb5_cc_cursor *);
 673      krb5_error_code(KRB5_CALLCONV *get_next)
 674      (krb5_context, krb5_ccache, krb5_cc_cursor *, krb5_creds *);
 675      krb5_error_code(KRB5_CALLCONV *end_get)
 676      (krb5_context, krb5_ccache, krb5_cc_cursor *);
 677      krb5_error_code(KRB5_CALLCONV *remove_cred)
 678      (krb5_context, krb5_ccache, krb5_flags, krb5_creds *);
 679      krb5_error_code(KRB5_CALLCONV *set_flags)
 680      (krb5_context, krb5_ccache, krb5_flags);
 681 } krb5_cc_ops;
 682 #  endif                        /* NO_DEF_KRB5_CCACHE */
 683
 684 krb5_error_code
 685     kssl_krb5_cc_get_principal
 686     (krb5_context context, krb5_ccache cache, krb5_principal *principal) {
 687     if (p_krb5_cc_get_principal)
 688         return (p_krb5_cc_get_principal(context, cache, principal));
 689     else
 690         return (krb5_x((cache)->ops->get_princ, (context, cache, principal)));
 691 }
 692
 693 krb5_error_code
 694 kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
 695                              krb5_rcache rcache)
 696 {
 697     if (p_krb5_auth_con_setrcache)
 698         return (p_krb5_auth_con_setrcache(con, acon, rcache));
 699     else
 700         return KRB5KRB_ERR_GENERIC;
 701 }
 702
 703 krb5_error_code
 704 kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data *data,
 705                             krb5_rcache *rcache)
 706 {
 707     if (p_krb5_get_server_rcache)
 708         return (p_krb5_get_server_rcache(con, data, rcache));
 709     else
 710         return KRB5KRB_ERR_GENERIC;
 711 }
 712
 713 krb5_error_code
 714 kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
 715                              krb5_rcache *prcache)
 716 {
 717     if (p_krb5_auth_con_getrcache)
 718         return (p_krb5_auth_con_getrcache(con, acon, prcache));
 719     else
 720         return KRB5KRB_ERR_GENERIC;
 721 }
 722
 723 krb5_error_code kssl_krb5_kt_close(krb5_context context, krb5_keytab keytab)
 724 {
 725     if (p_krb5_kt_close)
 726         return (p_krb5_kt_close(context, keytab));
 727     else
 728         return KRB5KRB_ERR_GENERIC;
 729 }
 730
 731 krb5_error_code
 732 kssl_krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
 733                        krb5_const_principal principal, krb5_kvno vno,
 734                        krb5_enctype enctype, krb5_keytab_entry *entry)
 735 {
 736     if (p_krb5_kt_get_entry)
 737         return (p_krb5_kt_get_entry
 738                 (context, keytab, principal, vno, enctype, entry));
 739     else
 740         return KRB5KRB_ERR_GENERIC;
 741 }
 742 # endif                         /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
 743
 744 /*
 745  * memory allocation functions for non-temporary storage (e.g. stuff that
 746  * gets saved into the kssl context)
 747  */
 748 static void *kssl_calloc(size_t nmemb, size_t size)
 749 {
 750     void *p;
 751
 752     p = OPENSSL_malloc(nmemb * size);
 753     if (p) {
 754         memset(p, 0, nmemb * size);
 755     }
 756     return p;
 757 }
 758
 759 # define kssl_malloc(size) OPENSSL_malloc((size))
 760 # define kssl_realloc(ptr, size) OPENSSL_realloc(ptr, size)
 761 # define kssl_free(ptr) OPENSSL_free((ptr))
 762
 763 char
 764 *kstring(char *string)
 765 {
 766     static char *null = "[NULL]";
 767
 768     return ((string == NULL) ? null : string);
 769 }
 770
 771 /*
 772  * Given KRB5 enctype (basically DES or 3DES), return closest match openssl
 773  * EVP_ encryption algorithm.  Return NULL for unknown or problematic
 774  * (krb5_dk_encrypt) enctypes.  Assume ENCTYPE_*_RAW (krb5_raw_encrypt) are
 775  * OK.
 776  */
 777 const EVP_CIPHER *kssl_map_enc(krb5_enctype enctype)
 778 {
 779     switch (enctype) {
 780     case ENCTYPE_DES_HMAC_SHA1: /* EVP_des_cbc(); */
 781     case ENCTYPE_DES_CBC_CRC:
 782     case ENCTYPE_DES_CBC_MD4:
 783     case ENCTYPE_DES_CBC_MD5:
 784     case ENCTYPE_DES_CBC_RAW:
 785         return EVP_des_cbc();
 786         break;
 787     case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */
 788     case ENCTYPE_DES3_CBC_SHA:
 789     case ENCTYPE_DES3_CBC_RAW:
 790         return EVP_des_ede3_cbc();
 791         break;
 792     default:
 793         return NULL;
 794         break;
 795     }
 796 }
 797
 798 /*
 799  * Return true:1 if p "looks like" the start of the real authenticator
 800  * described in kssl_skip_confound() below.  The ASN.1 pattern is "62 xx 30
 801  * yy" (APPLICATION-2, SEQUENCE), where xx-yy =~ 2, and xx and yy are
 802  * possibly multi-byte length fields.
 803  */
 804 static int kssl_test_confound(unsigned char *p)
 805 {
 806     int len = 2;
 807     int xx = 0, yy = 0;
 808
 809     if (*p++ != 0x62)
 810         return 0;
 811     if (*p > 0x82)
 812         return 0;
 813     switch (*p) {
 814     case 0x82:
 815         p++;
 816         xx = (*p++ << 8);
 817         xx += *p++;
 818         break;
 819     case 0x81:
 820         p++;
 821         xx = *p++;
 822         break;
 823     case 0x80:
 824         return 0;
 825     default:
 826         xx = *p++;
 827         break;
 828     }
 829     if (*p++ != 0x30)
 830         return 0;
 831     if (*p > 0x82)
 832         return 0;
 833     switch (*p) {
 834     case 0x82:
 835         p++;
 836         len += 2;
 837         yy = (*p++ << 8);
 838         yy += *p++;
 839         break;
 840     case 0x81:
 841         p++;
 842         len++;
 843         yy = *p++;
 844         break;
 845     case 0x80:
 846         return 0;
 847     default:
 848         yy = *p++;
 849         break;
 850     }
 851
 852     return (xx - len == yy) ? 1 : 0;
 853 }
 854
 855 /*
 856  * Allocate, fill, and return cksumlens array of checksum lengths.  This
 857  * array holds just the unique elements from the krb5_cksumarray[].  array[n]
 858  * == 0 signals end of data.  The krb5_cksumarray[] was an internal variable
 859  * that has since been replaced by a more general method for storing the
 860  * data.  It should not be used.  Instead we use real API calls and make a
 861  * guess for what the highest assigned CKSUMTYPE_ constant is.  As of 1.2.2
 862  * it is 0x000c (CKSUMTYPE_HMAC_SHA1_DES3).  So we will use 0x0010.
 863  */
 864 static size_t *populate_cksumlens(void)
 865 {
 866     int i, j, n;
 867     static size_t *cklens = NULL;
 868
 869 # ifdef KRB5_MIT_OLD11
 870     n = krb5_max_cksum;
 871 # else
 872     n = 0x0010;
 873 # endif                         /* KRB5_MIT_OLD11 */
 874
 875 # ifdef KRB5CHECKAUTH
 876     if (!cklens && !(cklens = (size_t *)calloc(sizeof(int), n + 1)))
 877         return NULL;
 878
 879     for (i = 0; i < n; i++) {
 880         if (!valid_cksumtype(i))
 881             continue;           /* array has holes */
 882         for (j = 0; j < n; j++) {
 883             if (cklens[j] == 0) {
 884                 cklens[j] = krb5_checksum_size(NULL, i);
 885                 break;          /* krb5 elem was new: add */
 886             }
 887             if (cklens[j] == krb5_checksum_size(NULL, i)) {
 888                 break;          /* ignore duplicate elements */
 889             }
 890         }
 891     }
 892 # endif                         /* KRB5CHECKAUTH */
 893
 894     return cklens;
 895 }
 896
 897 /*-
 898  *      Return pointer to start of real authenticator within authenticator, or
 899  *      return NULL on error.
 900  *      Decrypted authenticator looks like this:
 901  *              [0 or 8 byte confounder] [4-24 byte checksum] [real authent'r]
 902  *      This hackery wouldn't be necessary if MIT KRB5 1.0.6 had the
 903  *      krb5_auth_con_getcksumtype() function advertised in its krb5.h.
 904  */
 905 unsigned char *kssl_skip_confound(krb5_enctype etype, unsigned char *a)
 906 {
 907     int i, conlen;
 908     size_t cklen;
 909     static size_t *cksumlens = NULL;
 910     unsigned char *test_auth;
 911
 912     conlen = (etype) ? 8 : 0;
 913
 914     if (!cksumlens && !(cksumlens = populate_cksumlens()))
 915         return NULL;
 916     for (i = 0; (cklen = cksumlens[i]) != 0; i++) {
 917         test_auth = a + conlen + cklen;
 918         if (kssl_test_confound(test_auth))
 919             return test_auth;
 920     }
 921
 922     return NULL;
 923 }
 924
 925 /*
 926  * Set kssl_err error info when reason text is a simple string kssl_err =
 927  * struct { int reason; char text[KSSL_ERR_MAX+1]; }
 928  */
 929 void kssl_err_set(KSSL_ERR *kssl_err, int reason, char *text)
 930 {
 931     if (kssl_err == NULL)
 932         return;
 933
 934     kssl_err->reason = reason;
 935     BIO_snprintf(kssl_err->text, KSSL_ERR_MAX, "%s", text);
 936     return;
 937 }
 938
 939 /*
 940  * Display contents of krb5_data struct, for debugging
 941  */
 942 void print_krb5_data(char *label, krb5_data *kdata)
 943 {
 944     int i;
 945
 946     fprintf(stderr, "%s[%d] ", label, kdata->length);
 947     for (i = 0; i < (int)kdata->length; i++) {
 948         if (0 && isprint((int)kdata->data[i]))
 949             fprintf(stderr, "%c ", kdata->data[i]);
 950         else
 951             fprintf(stderr, "%02x ", (unsigned char)kdata->data[i]);
 952     }
 953     fprintf(stderr, "\n");
 954 }
 955
 956 /*
 957  * Display contents of krb5_authdata struct, for debugging
 958  */
 959 void print_krb5_authdata(char *label, krb5_authdata **adata)
 960 {
 961     if (adata == NULL) {
 962         fprintf(stderr, "%s, authdata==0\n", label);
 963         return;
 964     }
 965     fprintf(stderr, "%s [%p]\n", label, (void *)adata);
 966 }
 967
 968 /*
 969  * Display contents of krb5_keyblock struct, for debugging
 970  */
 971 void print_krb5_keyblock(char *label, krb5_keyblock *keyblk)
 972 {
 973     int i;
 974
 975     if (keyblk == NULL) {
 976         fprintf(stderr, "%s, keyblk==0\n", label);
 977         return;
 978     }
 979 # ifdef KRB5_HEIMDAL
 980     fprintf(stderr, "%s\n\t[et%d:%d]: ", label, keyblk->keytype,
 981             keyblk->keyvalue->length);
 982     for (i = 0; i < (int)keyblk->keyvalue->length; i++) {
 983         fprintf(stderr, "%02x",
 984                 (unsigned char *)(keyblk->keyvalue->contents)[i]);
 985     }
 986     fprintf(stderr, "\n");
 987 # else
 988     fprintf(stderr, "%s\n\t[et%d:%d]: ", label, keyblk->enctype,
 989             keyblk->length);
 990     for (i = 0; i < (int)keyblk->length; i++) {
 991         fprintf(stderr, "%02x", keyblk->contents[i]);
 992     }
 993     fprintf(stderr, "\n");
 994 # endif
 995 }
 996
 997 /*
 998  * Display contents of krb5_principal_data struct, for debugging
 999  * (krb5_principal is typedef'd == krb5_principal_data *)
1000  */
1001 static void print_krb5_princ(char *label, krb5_principal_data *princ)
1002 {
1003     int i, ui, uj;
1004
1005     fprintf(stderr, "%s principal Realm: ", label);
1006     if (princ == NULL)
1007         return;
1008     for (ui = 0; ui < (int)princ->realm.length; ui++)
1009         putchar(princ->realm.data[ui]);
1010     fprintf(stderr, " (nametype %d) has %d strings:\n", princ->type,
1011             princ->length);
1012     for (i = 0; i < (int)princ->length; i++) {
1013         fprintf(stderr, "\t%d [%d]: ", i, princ->data[i].length);
1014         for (uj = 0; uj < (int)princ->data[i].length; uj++) {
1015             putchar(princ->data[i].data[uj]);
1016         }
1017         fprintf(stderr, "\n");
1018     }
1019     return;
1020 }
1021
1022 /*-     Given krb5 service (typically "kssl") and hostname in kssl_ctx,
1023  *      Return encrypted Kerberos ticket for service @ hostname.
1024  *      If authenp is non-NULL, also return encrypted authenticator,
1025  *      whose data should be freed by caller.
1026  *      (Originally was: Create Kerberos AP_REQ message for SSL Client.)
1027  *
1028  *      19990628        VRS     Started; Returns Kerberos AP_REQ message.
1029  *      20010409        VRS     Modified for RFC2712; Returns enc tkt.
1030  *      20010606        VRS     May also return optional authenticator.
1031  */
1032 krb5_error_code kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
1033                               /*
1034                                * OUT
1035                                */ krb5_data **enc_ticketp,
1036                               /*
1037                                * UPDATE
1038                                */ krb5_data *authenp,
1039                               /*
1040                                * OUT
1041                                */ KSSL_ERR *kssl_err)
1042 {
1043     krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1044     krb5_context krb5context = NULL;
1045     krb5_auth_context krb5auth_context = NULL;
1046     krb5_ccache krb5ccdef = NULL;
1047     krb5_creds krb5creds, *krb5credsp = NULL;
1048     krb5_data krb5_app_req;
1049
1050     kssl_err_set(kssl_err, 0, "");
1051     memset((char *)&krb5creds, 0, sizeof(krb5creds));
1052
1053     if (!kssl_ctx) {
1054         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n");
1055         goto err;
1056     } else if (!kssl_ctx->service_host) {
1057         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1058                      "kssl_ctx service_host undefined.\n");
1059         goto err;
1060     }
1061
1062     if ((krb5rc = krb5_init_context(&krb5context)) != 0) {
1063         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1064                      "krb5_init_context() fails: %d\n", krb5rc);
1065         kssl_err->reason = SSL_R_KRB5_C_INIT;
1066         goto err;
1067     }
1068
1069     if ((krb5rc = krb5_sname_to_principal(krb5context,
1070                                           kssl_ctx->service_host,
1071                                           (kssl_ctx->service_name) ?
1072                                           kssl_ctx->service_name : KRB5SVC,
1073                                           KRB5_NT_SRV_HST,
1074                                           &krb5creds.server)) != 0) {
1075         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1076                      "krb5_sname_to_principal() fails for %s/%s\n",
1077                      kssl_ctx->service_host,
1078                      (kssl_ctx->
1079                       service_name) ? kssl_ctx->service_name : KRB5SVC);
1080         kssl_err->reason = SSL_R_KRB5_C_INIT;
1081         goto err;
1082     }
1083
1084     if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0) {
1085         kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1086                      "krb5_cc_default fails.\n");
1087         goto err;
1088     }
1089
1090     if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1091                                         &krb5creds.client)) != 0) {
1092         kssl_err_set(kssl_err, SSL_R_KRB5_C_CC_PRINC,
1093                      "krb5_cc_get_principal() fails.\n");
1094         goto err;
1095     }
1096
1097     if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1098                                        &krb5creds, &krb5credsp)) != 0) {
1099         kssl_err_set(kssl_err, SSL_R_KRB5_C_GET_CRED,
1100                      "krb5_get_credentials() fails.\n");
1101         goto err;
1102     }
1103
1104     *enc_ticketp = &krb5credsp->ticket;
1105 # ifdef KRB5_HEIMDAL
1106     kssl_ctx->enctype = krb5credsp->session.keytype;
1107 # else
1108     kssl_ctx->enctype = krb5credsp->keyblock.enctype;
1109 # endif
1110
1111     krb5rc = KRB5KRB_ERR_GENERIC;
1112     /*      caller should free data of krb5_app_req  */
1113     /*
1114      * 20010406 VRS deleted for real KerberosWrapper 20010605 VRS reinstated
1115      * to offer Authenticator to KerberosWrapper
1116      */
1117     krb5_app_req.length = 0;
1118     if (authenp) {
1119         krb5_data krb5in_data;
1120         const unsigned char *p;
1121         long arlen;
1122         KRB5_APREQBODY *ap_req;
1123
1124         authenp->length = 0;
1125         krb5in_data.data = NULL;
1126         krb5in_data.length = 0;
1127         if ((krb5rc = krb5_mk_req_extended(krb5context,
1128                                            &krb5auth_context, 0, &krb5in_data,
1129                                            krb5credsp, &krb5_app_req)) != 0) {
1130             kssl_err_set(kssl_err, SSL_R_KRB5_C_MK_REQ,
1131                          "krb5_mk_req_extended() fails.\n");
1132             goto err;
1133         }
1134
1135         arlen = krb5_app_req.length;
1136         p = (unsigned char *)krb5_app_req.data;
1137         ap_req = (KRB5_APREQBODY *)d2i_KRB5_APREQ(NULL, &p, arlen);
1138         if (ap_req) {
1139             authenp->length = i2d_KRB5_ENCDATA(ap_req->authenticator, NULL);
1140             if (authenp->length && (authenp->data = malloc(authenp->length))) {
1141                 unsigned char *adp = (unsigned char *)authenp->data;
1142                 authenp->length =
1143                     i2d_KRB5_ENCDATA(ap_req->authenticator, &adp);
1144             }
1145         }
1146
1147         if (ap_req)
1148             KRB5_APREQ_free((KRB5_APREQ *) ap_req);
1149         if (krb5_app_req.length)
1150             kssl_krb5_free_data_contents(krb5context, &krb5_app_req);
1151     }
1152 # ifdef KRB5_HEIMDAL
1153     if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session)) {
1154         kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1155                      "kssl_ctx_setkey() fails.\n");
1156     }
1157 # else
1158     if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->keyblock)) {
1159         kssl_err_set(kssl_err, SSL_R_KRB5_C_INIT,
1160                      "kssl_ctx_setkey() fails.\n");
1161     }
1162 # endif
1163     else
1164         krb5rc = 0;
1165
1166  err:
1167 # ifdef KSSL_DEBUG
1168     kssl_ctx_show(kssl_ctx);
1169 # endif                         /* KSSL_DEBUG */
1170
1171     if (krb5creds.client)
1172         krb5_free_principal(krb5context, krb5creds.client);
1173     if (krb5creds.server)
1174         krb5_free_principal(krb5context, krb5creds.server);
1175     if (krb5auth_context)
1176         krb5_auth_con_free(krb5context, krb5auth_context);
1177     if (krb5context)
1178         krb5_free_context(krb5context);
1179     return (krb5rc);
1180 }
1181
1182 /*-
1183  *  Given d2i_-decoded asn1ticket, allocate and return a new krb5_ticket.
1184  *  Return Kerberos error code and kssl_err struct on error.
1185  *  Allocates krb5_ticket and krb5_principal; caller should free these.
1186  *
1187  *      20010410        VRS     Implemented krb5_decode_ticket() as
1188  *                              old_krb5_decode_ticket(). Missing from MIT1.0.6.
1189  *      20010615        VRS     Re-cast as openssl/asn1 d2i_*() functions.
1190  *                              Re-used some of the old krb5_decode_ticket()
1191  *                              code here.  This tkt should alloc/free just
1192  *                              like the real thing.
1193  */
1194 static krb5_error_code kssl_TKT2tkt( /* IN */ krb5_context krb5context,
1195                                     /*
1196                                      * IN
1197                                      */ KRB5_TKTBODY *asn1ticket,
1198                                     /*
1199                                      * OUT
1200                                      */ krb5_ticket **krb5ticket,
1201                                     /*
1202                                      * OUT
1203                                      */ KSSL_ERR *kssl_err)
1204 {
1205     krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1206     krb5_ticket *new5ticket = NULL;
1207     ASN1_GENERALSTRING *gstr_svc, *gstr_host;
1208
1209     *krb5ticket = NULL;
1210
1211     if (asn1ticket == NULL || asn1ticket->realm == NULL ||
1212         asn1ticket->sname == NULL ||
1213         sk_ASN1_GENERALSTRING_num(asn1ticket->sname->namestring) < 2) {
1214         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1215                      "Null field in asn1ticket.\n");
1216         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1217         return KRB5KRB_ERR_GENERIC;
1218     }
1219
1220     if ((new5ticket = (krb5_ticket *)calloc(1, sizeof(krb5_ticket))) == NULL) {
1221         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1222                      "Unable to allocate new krb5_ticket.\n");
1223         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1224         return ENOMEM;          /* or KRB5KRB_ERR_GENERIC; */
1225     }
1226
1227     gstr_svc = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 0);
1228     gstr_host = sk_ASN1_GENERALSTRING_value(asn1ticket->sname->namestring, 1);
1229
1230     if ((krb5rc = kssl_build_principal_2(krb5context,
1231                                          &new5ticket->server,
1232                                          asn1ticket->realm->length,
1233                                          (char *)asn1ticket->realm->data,
1234                                          gstr_svc->length,
1235                                          (char *)gstr_svc->data,
1236                                          gstr_host->length,
1237                                          (char *)gstr_host->data)) != 0) {
1238         free(new5ticket);
1239         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1240                      "Error building ticket server principal.\n");
1241         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1242         return krb5rc;          /* or KRB5KRB_ERR_GENERIC; */
1243     }
1244
1245     krb5_princ_type(krb5context, new5ticket->server) =
1246         asn1ticket->sname->nametype->data[0];
1247     new5ticket->enc_part.enctype = asn1ticket->encdata->etype->data[0];
1248     new5ticket->enc_part.kvno = asn1ticket->encdata->kvno->data[0];
1249     new5ticket->enc_part.ciphertext.length =
1250         asn1ticket->encdata->cipher->length;
1251     if ((new5ticket->enc_part.ciphertext.data =
1252          calloc(1, asn1ticket->encdata->cipher->length)) == NULL) {
1253         free(new5ticket);
1254         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1255                      "Error allocating cipher in krb5ticket.\n");
1256         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1257         return KRB5KRB_ERR_GENERIC;
1258     } else {
1259         memcpy(new5ticket->enc_part.ciphertext.data,
1260                asn1ticket->encdata->cipher->data,
1261                asn1ticket->encdata->cipher->length);
1262     }
1263
1264     *krb5ticket = new5ticket;
1265     return 0;
1266 }
1267
1268 /*-
1269  *      Given krb5 service name in KSSL_CTX *kssl_ctx (typically "kssl"),
1270  *              and krb5 AP_REQ message & message length,
1271  *      Return Kerberos session key and client principle
1272  *              to SSL Server in KSSL_CTX *kssl_ctx.
1273  *
1274  *      19990702        VRS     Started.
1275  */
1276 krb5_error_code kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
1277                               /*
1278                                * IN
1279                                */ krb5_data *indata,
1280                               /*
1281                                * OUT
1282                                */ krb5_ticket_times *ttimes,
1283                               /*
1284                                * OUT
1285                                */ KSSL_ERR *kssl_err)
1286 {
1287     krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1288     static krb5_context krb5context = NULL;
1289     static krb5_auth_context krb5auth_context = NULL;
1290     krb5_ticket *krb5ticket = NULL;
1291     KRB5_TKTBODY *asn1ticket = NULL;
1292     const unsigned char *p;
1293     krb5_keytab krb5keytab = NULL;
1294     krb5_keytab_entry kt_entry;
1295     krb5_principal krb5server;
1296     krb5_rcache rcache = NULL;
1297
1298     kssl_err_set(kssl_err, 0, "");
1299
1300     if (!kssl_ctx) {
1301         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT, "No kssl_ctx defined.\n");
1302         goto err;
1303     }
1304 # ifdef KSSL_DEBUG
1305     fprintf(stderr, "in kssl_sget_tkt(%s)\n",
1306             kstring(kssl_ctx->service_name));
1307 # endif                         /* KSSL_DEBUG */
1308
1309     if (!krb5context && (krb5rc = krb5_init_context(&krb5context))) {
1310         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1311                      "krb5_init_context() fails.\n");
1312         goto err;
1313     }
1314     if (krb5auth_context &&
1315         (krb5rc = krb5_auth_con_free(krb5context, krb5auth_context))) {
1316         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1317                      "krb5_auth_con_free() fails.\n");
1318         goto err;
1319     } else
1320         krb5auth_context = NULL;
1321     if (!krb5auth_context &&
1322         (krb5rc = krb5_auth_con_init(krb5context, &krb5auth_context))) {
1323         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1324                      "krb5_auth_con_init() fails.\n");
1325         goto err;
1326     }
1327
1328     if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
1329                                           &rcache))) {
1330         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1331                      "krb5_auth_con_getrcache() fails.\n");
1332         goto err;
1333     }
1334
1335     if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
1336                                           (kssl_ctx->service_name) ?
1337                                           kssl_ctx->service_name : KRB5SVC,
1338                                           KRB5_NT_SRV_HST,
1339                                           &krb5server)) != 0) {
1340         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1341                      "krb5_sname_to_principal() fails.\n");
1342         goto err;
1343     }
1344
1345     if (rcache == NULL) {
1346         if ((krb5rc = krb5_get_server_rcache(krb5context,
1347                                              krb5_princ_component(krb5context,
1348                                                                   krb5server,
1349                                                                   0),
1350                                              &rcache))) {
1351             kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1352                          "krb5_get_server_rcache() fails.\n");
1353             goto err;
1354         }
1355     }
1356
1357     if ((krb5rc =
1358          krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache))) {
1359         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1360                      "krb5_auth_con_setrcache() fails.\n");
1361         goto err;
1362     }
1363
1364     /*
1365      * kssl_ctx->keytab_file == NULL ==> use Kerberos default
1366      */
1367     if (kssl_ctx->keytab_file) {
1368         krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1369                                  &krb5keytab);
1370         if (krb5rc) {
1371             kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1372                          "krb5_kt_resolve() fails.\n");
1373             goto err;
1374         }
1375     } else {
1376         krb5rc = krb5_kt_default(krb5context, &krb5keytab);
1377         if (krb5rc) {
1378             kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
1379                          "krb5_kt_default() fails.\n");
1380             goto err;
1381         }
1382     }
1383
1384     /*-     Actual Kerberos5 krb5_recvauth() has initial conversation here
1385      *      o       check KRB5_SENDAUTH_BADAUTHVERS
1386      *              unless KRB5_RECVAUTH_SKIP_VERSION
1387      *      o       check KRB5_SENDAUTH_BADAPPLVERS
1388      *      o       send "0" msg if all OK
1389      */
1390
1391     /*-
1392      * 20010411 was using AP_REQ instead of true KerberosWrapper
1393      *
1394      *  if ((krb5rc = krb5_rd_req(krb5context, &krb5auth_context,
1395      *                      &krb5in_data, krb5server, krb5keytab,
1396      *                      &ap_option, &krb5ticket)) != 0)  { Error }
1397      */
1398
1399     p = (unsigned char *)indata->data;
1400     if ((asn1ticket = (KRB5_TKTBODY *)d2i_KRB5_TICKET(NULL, &p,
1401                                                       (long)indata->length))
1402         == NULL) {
1403         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1404                      "d2i_KRB5_TICKET() ASN.1 decode failure.\n");
1405         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1406         goto err;
1407     }
1408
1409     /*
1410      * Was: krb5rc = krb5_decode_ticket(krb5in_data,&krb5ticket)) != 0)
1411      */
1412     if ((krb5rc = kssl_TKT2tkt(krb5context, asn1ticket, &krb5ticket,
1413                                kssl_err)) != 0) {
1414         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1415                      "Error converting ASN.1 ticket to krb5_ticket.\n");
1416         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1417         goto err;
1418     }
1419
1420     if (!krb5_principal_compare(krb5context, krb5server, krb5ticket->server)) {
1421         krb5rc = KRB5_PRINC_NOMATCH;
1422         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1423                      "server principal != ticket principal\n");
1424         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1425         goto err;
1426     }
1427     if ((krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
1428                                     krb5ticket->server,
1429                                     krb5ticket->enc_part.kvno,
1430                                     krb5ticket->enc_part.enctype,
1431                                     &kt_entry)) != 0) {
1432         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1433                      "krb5_kt_get_entry() fails with %x.\n", krb5rc);
1434         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1435         goto err;
1436     }
1437     if ((krb5rc = krb5_decrypt_tkt_part(krb5context, &kt_entry.key,
1438                                         krb5ticket)) != 0) {
1439         BIO_snprintf(kssl_err->text, KSSL_ERR_MAX,
1440                      "krb5_decrypt_tkt_part() failed.\n");
1441         kssl_err->reason = SSL_R_KRB5_S_RD_REQ;
1442         goto err;
1443     } else {
1444         krb5_kt_free_entry(krb5context, &kt_entry);
1445 # ifdef KSSL_DEBUG
1446         {
1447             int i;
1448             krb5_address **paddr = krb5ticket->enc_part2->caddrs;
1449             fprintf(stderr, "Decrypted ticket fields:\n");
1450             fprintf(stderr, "\tflags: %X, transit-type: %X",
1451                     krb5ticket->enc_part2->flags,
1452                     krb5ticket->enc_part2->transited.tr_type);
1453             print_krb5_data("\ttransit-data: ",
1454                             &(krb5ticket->enc_part2->transited.tr_contents));
1455             fprintf(stderr, "\tcaddrs: %p, authdata: %p\n",
1456                     krb5ticket->enc_part2->caddrs,
1457                     krb5ticket->enc_part2->authorization_data);
1458             if (paddr) {
1459                 fprintf(stderr, "\tcaddrs:\n");
1460                 for (i = 0; paddr[i] != NULL; i++) {
1461                     krb5_data d;
1462                     d.length = paddr[i]->length;
1463                     d.data = paddr[i]->contents;
1464                     print_krb5_data("\t\tIP: ", &d);
1465                 }
1466             }
1467             fprintf(stderr, "\tstart/auth/end times: %d / %d / %d\n",
1468                     krb5ticket->enc_part2->times.starttime,
1469                     krb5ticket->enc_part2->times.authtime,
1470                     krb5ticket->enc_part2->times.endtime);
1471         }
1472 # endif                         /* KSSL_DEBUG */
1473     }
1474
1475     krb5rc = KRB5_NO_TKT_SUPPLIED;
1476     if (!krb5ticket || !krb5ticket->enc_part2 ||
1477         !krb5ticket->enc_part2->client ||
1478         !krb5ticket->enc_part2->client->data ||
1479         !krb5ticket->enc_part2->session) {
1480         kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1481                      "bad ticket from krb5_rd_req.\n");
1482     } else if (kssl_ctx_setprinc(kssl_ctx, KSSL_CLIENT,
1483                                  &krb5ticket->enc_part2->client->realm,
1484                                  krb5ticket->enc_part2->client->data,
1485                                  krb5ticket->enc_part2->client->length)) {
1486         kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1487                      "kssl_ctx_setprinc() fails.\n");
1488     } else if (kssl_ctx_setkey(kssl_ctx, krb5ticket->enc_part2->session)) {
1489         kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1490                      "kssl_ctx_setkey() fails.\n");
1491     } else if (krb5ticket->enc_part2->flags & TKT_FLG_INVALID) {
1492         krb5rc = KRB5KRB_AP_ERR_TKT_INVALID;
1493         kssl_err_set(kssl_err, SSL_R_KRB5_S_BAD_TICKET,
1494                      "invalid ticket from krb5_rd_req.\n");
1495     } else
1496         krb5rc = 0;
1497
1498     kssl_ctx->enctype = krb5ticket->enc_part.enctype;
1499     ttimes->authtime = krb5ticket->enc_part2->times.authtime;
1500     ttimes->starttime = krb5ticket->enc_part2->times.starttime;
1501     ttimes->endtime = krb5ticket->enc_part2->times.endtime;
1502     ttimes->renew_till = krb5ticket->enc_part2->times.renew_till;
1503
1504  err:
1505 # ifdef KSSL_DEBUG
1506     kssl_ctx_show(kssl_ctx);
1507 # endif                         /* KSSL_DEBUG */
1508
1509     if (asn1ticket)
1510         KRB5_TICKET_free((KRB5_TICKET *) asn1ticket);
1511     if (krb5keytab)
1512         krb5_kt_close(krb5context, krb5keytab);
1513     if (krb5ticket)
1514         krb5_free_ticket(krb5context, krb5ticket);
1515     if (krb5server)
1516         krb5_free_principal(krb5context, krb5server);
1517     return (krb5rc);
1518 }
1519
1520 /*
1521  * Allocate & return a new kssl_ctx struct.
1522  */
1523 KSSL_CTX *kssl_ctx_new(void)
1524 {
1525     return ((KSSL_CTX *)kssl_calloc(1, sizeof(KSSL_CTX)));
1526 }
1527
1528 /*
1529  * Frees a kssl_ctx struct and any allocated memory it holds.  Returns NULL.
1530  */
1531 KSSL_CTX *kssl_ctx_free(KSSL_CTX *kssl_ctx)
1532 {
1533     if (kssl_ctx == NULL)
1534         return kssl_ctx;
1535
1536     if (kssl_ctx->key)
1537         OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
1538     if (kssl_ctx->key)
1539         kssl_free(kssl_ctx->key);
1540     if (kssl_ctx->client_princ)
1541         kssl_free(kssl_ctx->client_princ);
1542     if (kssl_ctx->service_host)
1543         kssl_free(kssl_ctx->service_host);
1544     if (kssl_ctx->service_name)
1545         kssl_free(kssl_ctx->service_name);
1546     if (kssl_ctx->keytab_file)
1547         kssl_free(kssl_ctx->keytab_file);
1548
1549     kssl_free(kssl_ctx);
1550     return (KSSL_CTX *)NULL;
1551 }
1552
1553 /*
1554  * Given an array of (krb5_data *) entity (and optional realm), set the plain
1555  * (char *) client_princ or service_host member of the kssl_ctx struct.
1556  */
1557 krb5_error_code
1558 kssl_ctx_setprinc(KSSL_CTX *kssl_ctx, int which,
1559                   krb5_data *realm, krb5_data *entity, int nentities)
1560 {
1561     char **princ;
1562     int length;
1563     int i;
1564
1565     if (kssl_ctx == NULL || entity == NULL)
1566         return KSSL_CTX_ERR;
1567
1568     switch (which) {
1569     case KSSL_CLIENT:
1570         princ = &kssl_ctx->client_princ;
1571         break;
1572     case KSSL_SERVER:
1573         princ = &kssl_ctx->service_host;
1574         break;
1575     default:
1576         return KSSL_CTX_ERR;
1577         break;
1578     }
1579     if (*princ)
1580         kssl_free(*princ);
1581
1582     /* Add up all the entity->lengths */
1583     length = 0;
1584     for (i = 0; i < nentities; i++) {
1585         length += entity[i].length;
1586     }
1587     /* Add in space for the '/' character(s) (if any) */
1588     length += nentities - 1;
1589     /* Space for the ('@'+realm+NULL | NULL) */
1590     length += ((realm) ? realm->length + 2 : 1);
1591
1592     if ((*princ = kssl_calloc(1, length)) == NULL)
1593         return KSSL_CTX_ERR;
1594     else {
1595         for (i = 0; i < nentities; i++) {
1596             strncat(*princ, entity[i].data, entity[i].length);
1597             if (i < nentities - 1) {
1598                 strcat(*princ, "/");
1599             }
1600         }
1601         if (realm) {
1602             strcat(*princ, "@");
1603             (void)strncat(*princ, realm->data, realm->length);
1604         }
1605     }
1606
1607     return KSSL_CTX_OK;
1608 }
1609
1610 /*-     Set one of the plain (char *) string members of the kssl_ctx struct.
1611  *      Default values should be:
1612  *              which == KSSL_SERVICE   =>      "khost" (KRB5SVC)
1613  *              which == KSSL_KEYTAB    =>      "/etc/krb5.keytab" (KRB5KEYTAB)
1614  */
1615 krb5_error_code kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text)
1616 {
1617     char **string;
1618
1619     if (!kssl_ctx)
1620         return KSSL_CTX_ERR;
1621
1622     switch (which) {
1623     case KSSL_SERVICE:
1624         string = &kssl_ctx->service_name;
1625         break;
1626     case KSSL_SERVER:
1627         string = &kssl_ctx->service_host;
1628         break;
1629     case KSSL_CLIENT:
1630         string = &kssl_ctx->client_princ;
1631         break;
1632     case KSSL_KEYTAB:
1633         string = &kssl_ctx->keytab_file;
1634         break;
1635     default:
1636         return KSSL_CTX_ERR;
1637         break;
1638     }
1639     if (*string)
1640         kssl_free(*string);
1641
1642     if (!text) {
1643         *string = '\0';
1644         return KSSL_CTX_OK;
1645     }
1646
1647     if ((*string = kssl_calloc(1, strlen(text) + 1)) == NULL)
1648         return KSSL_CTX_ERR;
1649     else
1650         strcpy(*string, text);
1651
1652     return KSSL_CTX_OK;
1653 }
1654
1655 /*
1656  * Copy the Kerberos session key from a (krb5_keyblock *) to a kssl_ctx
1657  * struct.  Clear kssl_ctx->key if Kerberos session key is NULL.
1658  */
1659 krb5_error_code kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
1660 {
1661     int length;
1662     krb5_enctype enctype;
1663     krb5_octet FAR *contents = NULL;
1664
1665     if (!kssl_ctx)
1666         return KSSL_CTX_ERR;
1667
1668     if (kssl_ctx->key) {
1669         OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
1670         kssl_free(kssl_ctx->key);
1671     }
1672
1673     if (session) {
1674
1675 # ifdef KRB5_HEIMDAL
1676         length = session->keyvalue->length;
1677         enctype = session->keytype;
1678         contents = session->keyvalue->contents;
1679 # else
1680         length = session->length;
1681         enctype = session->enctype;
1682         contents = session->contents;
1683 # endif
1684         kssl_ctx->enctype = enctype;
1685         kssl_ctx->length = length;
1686     } else {
1687         kssl_ctx->enctype = ENCTYPE_UNKNOWN;
1688         kssl_ctx->length = 0;
1689         return KSSL_CTX_OK;
1690     }
1691
1692     if ((kssl_ctx->key =
1693          (krb5_octet FAR *)kssl_calloc(1, kssl_ctx->length)) == NULL) {
1694         kssl_ctx->length = 0;
1695         return KSSL_CTX_ERR;
1696     } else
1697         memcpy(kssl_ctx->key, contents, length);
1698
1699     return KSSL_CTX_OK;
1700 }
1701
1702 /*
1703  * Display contents of kssl_ctx struct
1704  */
1705 void kssl_ctx_show(KSSL_CTX *kssl_ctx)
1706 {
1707     int i;
1708
1709     printf("kssl_ctx: ");
1710     if (kssl_ctx == NULL) {
1711         printf("NULL\n");
1712         return;
1713     } else
1714         printf("%p\n", (void *)kssl_ctx);
1715
1716     printf("\tservice:\t%s\n",
1717            (kssl_ctx->service_name) ? kssl_ctx->service_name : "NULL");
1718     printf("\tclient:\t%s\n",
1719            (kssl_ctx->client_princ) ? kssl_ctx->client_princ : "NULL");
1720     printf("\tserver:\t%s\n",
1721            (kssl_ctx->service_host) ? kssl_ctx->service_host : "NULL");
1722     printf("\tkeytab:\t%s\n",
1723            (kssl_ctx->keytab_file) ? kssl_ctx->keytab_file : "NULL");
1724     printf("\tkey [%d:%d]:\t", kssl_ctx->enctype, kssl_ctx->length);
1725
1726     for (i = 0; i < kssl_ctx->length && kssl_ctx->key; i++) {
1727         printf("%02x", kssl_ctx->key[i]);
1728     }
1729     printf("\n");
1730     return;
1731 }
1732
1733 int kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
1734 {
1735     krb5_context krb5context = NULL;
1736     krb5_keytab krb5keytab = NULL;
1737     krb5_keytab_entry entry;
1738     krb5_principal princ = NULL;
1739     krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1740     int rc = 0;
1741
1742     if ((krb5rc = krb5_init_context(&krb5context)))
1743         return (0);
1744
1745     /*
1746      * kssl_ctx->keytab_file == NULL ==> use Kerberos default
1747      */
1748     if (kssl_ctx->keytab_file) {
1749         krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
1750                                  &krb5keytab);
1751         if (krb5rc)
1752             goto exit;
1753     } else {
1754         krb5rc = krb5_kt_default(krb5context, &krb5keytab);
1755         if (krb5rc)
1756             goto exit;
1757     }
1758
1759     /* the host key we are looking for */
1760     krb5rc = krb5_sname_to_principal(krb5context, NULL,
1761                                      kssl_ctx->
1762                                      service_name ? kssl_ctx->service_name :
1763                                      KRB5SVC, KRB5_NT_SRV_HST, &princ);
1764
1765     if (krb5rc)
1766         goto exit;
1767
1768     krb5rc = krb5_kt_get_entry(krb5context, krb5keytab, princ,
1769                                /* IGNORE_VNO */
1770                                0,
1771                                /* IGNORE_ENCTYPE */
1772                                0, &entry);
1773     if (krb5rc == KRB5_KT_NOTFOUND) {
1774         rc = 1;
1775         goto exit;
1776     } else if (krb5rc)
1777         goto exit;
1778
1779     krb5_kt_free_entry(krb5context, &entry);
1780     rc = 1;
1781
1782  exit:
1783     if (krb5keytab)
1784         krb5_kt_close(krb5context, krb5keytab);
1785     if (princ)
1786         krb5_free_principal(krb5context, princ);
1787     if (krb5context)
1788         krb5_free_context(krb5context);
1789     return (rc);
1790 }
1791
1792 int kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
1793 {
1794     krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
1795     krb5_context krb5context = NULL;
1796     krb5_ccache krb5ccdef = NULL;
1797     krb5_creds krb5creds, *krb5credsp = NULL;
1798     int rc = 0;
1799
1800     memset((char *)&krb5creds, 0, sizeof(krb5creds));
1801
1802     if (!kssl_ctx)
1803         return (0);
1804
1805     if (!kssl_ctx->service_host)
1806         return (0);
1807
1808     if ((krb5rc = krb5_init_context(&krb5context)) != 0)
1809         goto err;
1810
1811     if ((krb5rc = krb5_sname_to_principal(krb5context,
1812                                           kssl_ctx->service_host,
1813                                           (kssl_ctx->service_name) ?
1814                                           kssl_ctx->service_name : KRB5SVC,
1815                                           KRB5_NT_SRV_HST,
1816                                           &krb5creds.server)) != 0)
1817         goto err;
1818
1819     if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
1820         goto err;
1821
1822     if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
1823                                         &krb5creds.client)) != 0)
1824         goto err;
1825
1826     if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
1827                                        &krb5creds, &krb5credsp)) != 0)
1828         goto err;
1829
1830     rc = 1;
1831
1832  err:
1833 # ifdef KSSL_DEBUG
1834     kssl_ctx_show(kssl_ctx);
1835 # endif                         /* KSSL_DEBUG */
1836
1837     if (krb5creds.client)
1838         krb5_free_principal(krb5context, krb5creds.client);
1839     if (krb5creds.server)
1840         krb5_free_principal(krb5context, krb5creds.server);
1841     if (krb5context)
1842         krb5_free_context(krb5context);
1843     return (rc);
1844 }
1845
1846 # if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
1847 void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
1848 {
1849 #  ifdef KRB5_HEIMDAL
1850     data->length = 0;
1851     if (data->data)
1852         free(data->data);
1853 #  elif defined(KRB5_MIT_OLD11)
1854     if (data->data) {
1855         krb5_xfree(data->data);
1856         data->data = 0;
1857     }
1858 #  else
1859     krb5_free_data_contents(NULL, data);
1860 #  endif
1861 }
1862 # endif
1863 /* !OPENSSL_SYS_WINDOWS && !OPENSSL_SYS_WIN32 */
1864
1865 /*
1866  * Given pointers to KerberosTime and struct tm structs, convert the
1867  * KerberosTime string to struct tm.  Note that KerberosTime is a
1868  * ASN1_GENERALIZEDTIME value, constrained to GMT with no fractional seconds
1869  * as defined in RFC 1510.  Return pointer to the (partially) filled in
1870  * struct tm on success, return NULL on failure.
1871  */
1872 static struct tm *k_gmtime(ASN1_GENERALIZEDTIME *gtime, struct tm *k_tm)
1873 {
1874     char c, *p;
1875
1876     if (!k_tm)
1877         return NULL;
1878     if (gtime == NULL || gtime->length < 14)
1879         return NULL;
1880     if (gtime->data == NULL)
1881         return NULL;
1882
1883     p = (char *)&gtime->data[14];
1884
1885     c = *p;
1886     *p = '\0';
1887     p -= 2;
1888     k_tm->tm_sec = atoi(p);
1889     *(p + 2) = c;
1890     c = *p;
1891     *p = '\0';
1892     p -= 2;
1893     k_tm->tm_min = atoi(p);
1894     *(p + 2) = c;
1895     c = *p;
1896     *p = '\0';
1897     p -= 2;
1898     k_tm->tm_hour = atoi(p);
1899     *(p + 2) = c;
1900     c = *p;
1901     *p = '\0';
1902     p -= 2;
1903     k_tm->tm_mday = atoi(p);
1904     *(p + 2) = c;
1905     c = *p;
1906     *p = '\0';
1907     p -= 2;
1908     k_tm->tm_mon = atoi(p) - 1;
1909     *(p + 2) = c;
1910     c = *p;
1911     *p = '\0';
1912     p -= 4;
1913     k_tm->tm_year = atoi(p) - 1900;
1914     *(p + 4) = c;
1915
1916     return k_tm;
1917 }
1918
1919 /*
1920  * Helper function for kssl_validate_times().  We need context->clockskew,
1921  * but krb5_context is an opaque struct.  So we try to sneek the clockskew
1922  * out through the replay cache.  If that fails just return a likely default
1923  * (300 seconds).
1924  */
1925 static krb5_deltat get_rc_clockskew(krb5_context context)
1926 {
1927     krb5_rcache rc;
1928     krb5_deltat clockskew;
1929
1930     if (krb5_rc_default(context, &rc))
1931         return KSSL_CLOCKSKEW;
1932     if (krb5_rc_initialize(context, rc, 0))
1933         return KSSL_CLOCKSKEW;
1934     if (krb5_rc_get_lifespan(context, rc, &clockskew)) {
1935         clockskew = KSSL_CLOCKSKEW;
1936     }
1937     (void)krb5_rc_destroy(context, rc);
1938     return clockskew;
1939 }
1940
1941 /*
1942  * kssl_validate_times() combines (and more importantly exposes) the MIT KRB5
1943  * internal function krb5_validate_times() and the in_clock_skew() macro.
1944  * The authenticator client time is checked to be within clockskew secs of
1945  * the current time and the current time is checked to be within the ticket
1946  * start and expire times.  Either check may be omitted by supplying a NULL
1947  * value.  Returns 0 for valid times, SSL_R_KRB5* error codes otherwise.  See
1948  * Also: (Kerberos source)/krb5/lib/krb5/krb/valid_times.c 20010420 VRS
1949  */
1950 krb5_error_code kssl_validate_times(krb5_timestamp atime,
1951                                     krb5_ticket_times *ttimes)
1952 {
1953     krb5_deltat skew;
1954     krb5_timestamp start, now;
1955     krb5_error_code rc;
1956     krb5_context context;
1957
1958     if ((rc = krb5_init_context(&context)))
1959         return SSL_R_KRB5_S_BAD_TICKET;
1960     skew = get_rc_clockskew(context);
1961     if ((rc = krb5_timeofday(context, &now)))
1962         return SSL_R_KRB5_S_BAD_TICKET;
1963     krb5_free_context(context);
1964
1965     if (atime && labs(atime - now) >= skew)
1966         return SSL_R_KRB5_S_TKT_SKEW;
1967
1968     if (!ttimes)
1969         return 0;
1970
1971     start = (ttimes->starttime != 0) ? ttimes->starttime : ttimes->authtime;
1972     if (start - now > skew)
1973         return SSL_R_KRB5_S_TKT_NYV;
1974     if ((now - ttimes->endtime) > skew)
1975         return SSL_R_KRB5_S_TKT_EXPIRED;
1976
1977 # ifdef KSSL_DEBUG
1978     fprintf(stderr, "kssl_validate_times: %d |<-  | %d - %d | < %d  ->| %d\n",
1979             start, atime, now, skew, ttimes->endtime);
1980 # endif                         /* KSSL_DEBUG */
1981
1982     return 0;
1983 }
1984
1985 /*
1986  * Decode and decrypt given DER-encoded authenticator, then pass
1987  * authenticator ctime back in *atimep (or 0 if time unavailable).  Returns
1988  * krb5_error_code and kssl_err on error.  A NULL authenticator
1989  * (authentp->length == 0) is not considered an error.  Note that
1990  * kssl_check_authent() makes use of the KRB5 session key; you must call
1991  * kssl_sget_tkt() to get the key before calling this routine.
1992  */
1993 krb5_error_code kssl_check_authent(
1994                                       /*
1995                                        * IN
1996                                        */ KSSL_CTX *kssl_ctx,
1997                                       /*
1998                                        * IN
1999                                        */ krb5_data *authentp,
2000                                       /*
2001                                        * OUT
2002                                        */ krb5_timestamp *atimep,
2003                                       /*
2004                                        * OUT
2005                                        */ KSSL_ERR *kssl_err)
2006 {
2007     krb5_error_code krb5rc = 0;
2008     KRB5_ENCDATA *dec_authent = NULL;
2009     KRB5_AUTHENTBODY *auth = NULL;
2010     krb5_enctype enctype;
2011     EVP_CIPHER_CTX ciph_ctx;
2012     const EVP_CIPHER *enc = NULL;
2013     unsigned char iv[EVP_MAX_IV_LENGTH];
2014     const unsigned char *p;
2015     unsigned char *unenc_authent;
2016     int outl, unencbufsize;
2017     struct tm tm_time, *tm_l, *tm_g;
2018     time_t now, tl, tg, tr, tz_offset;
2019
2020     EVP_CIPHER_CTX_init(&ciph_ctx);
2021     *atimep = 0;
2022     kssl_err_set(kssl_err, 0, "");
2023
2024 # ifndef KRB5CHECKAUTH
2025     authentp = NULL;
2026 # else
2027 #  if     KRB5CHECKAUTH == 0
2028     authentp = NULL;
2029 #  endif
2030 # endif                         /* KRB5CHECKAUTH */
2031
2032     if (authentp == NULL || authentp->length == 0)
2033         return 0;
2034
2035 # ifdef KSSL_DEBUG
2036     {
2037         unsigned int ui;
2038         fprintf(stderr, "kssl_check_authent: authenticator[%d]:\n",
2039                 authentp->length);
2040         p = authentp->data;
2041         for (ui = 0; ui < authentp->length; ui++)
2042             fprintf(stderr, "%02x ", p[ui]);
2043         fprintf(stderr, "\n");
2044     }
2045 # endif                         /* KSSL_DEBUG */
2046
2047     unencbufsize = 2 * authentp->length;
2048     if ((unenc_authent = calloc(1, unencbufsize)) == NULL) {
2049         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2050                      "Unable to allocate authenticator buffer.\n");
2051         krb5rc = KRB5KRB_ERR_GENERIC;
2052         goto err;
2053     }
2054
2055     p = (unsigned char *)authentp->data;
2056     if ((dec_authent = d2i_KRB5_ENCDATA(NULL, &p,
2057                                         (long)authentp->length)) == NULL) {
2058         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2059                      "Error decoding authenticator.\n");
2060         krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2061         goto err;
2062     }
2063
2064     enctype = dec_authent->etype->data[0]; /* should = kssl_ctx->enctype */
2065 # if !defined(KRB5_MIT_OLD11)
2066     switch (enctype) {
2067     case ENCTYPE_DES3_CBC_SHA1: /* EVP_des_ede3_cbc(); */
2068     case ENCTYPE_DES3_CBC_SHA:
2069     case ENCTYPE_DES3_CBC_RAW:
2070         krb5rc = 0;             /* Skip, can't handle derived keys */
2071         goto err;
2072     }
2073 # endif
2074     enc = kssl_map_enc(enctype);
2075     memset(iv, 0, sizeof iv);   /* per RFC 1510 */
2076
2077     if (enc == NULL) {
2078         /*
2079          * Disable kssl_check_authent for ENCTYPE_DES3_CBC_SHA1.  This
2080          * enctype indicates the authenticator was encrypted using key-usage
2081          * derived keys which openssl cannot decrypt.
2082          */
2083         goto err;
2084     }
2085
2086     if (!EVP_CipherInit(&ciph_ctx, enc, kssl_ctx->key, iv, 0)) {
2087         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2088                      "EVP_CipherInit error decrypting authenticator.\n");
2089         krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2090         goto err;
2091     }
2092     outl = dec_authent->cipher->length;
2093     if (!EVP_Cipher
2094         (&ciph_ctx, unenc_authent, dec_authent->cipher->data, outl)) {
2095         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2096                      "EVP_Cipher error decrypting authenticator.\n");
2097         krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2098         goto err;
2099     }
2100     EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2101
2102 # ifdef KSSL_DEBUG
2103     {
2104         int padl;
2105         fprintf(stderr, "kssl_check_authent: decrypted authenticator[%d] =\n",
2106                 outl);
2107         for (padl = 0; padl < outl; padl++)
2108             fprintf(stderr, "%02x ", unenc_authent[padl]);
2109         fprintf(stderr, "\n");
2110     }
2111 # endif                         /* KSSL_DEBUG */
2112
2113     if ((p = kssl_skip_confound(enctype, unenc_authent)) == NULL) {
2114         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2115                      "confounded by authenticator.\n");
2116         krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2117         goto err;
2118     }
2119     outl -= p - unenc_authent;
2120
2121     if ((auth = (KRB5_AUTHENTBODY *)d2i_KRB5_AUTHENT(NULL, &p,
2122                                                      (long)outl)) == NULL) {
2123         kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
2124                      "Error decoding authenticator body.\n");
2125         krb5rc = KRB5KRB_AP_ERR_BAD_INTEGRITY;
2126         goto err;
2127     }
2128
2129     memset(&tm_time, 0, sizeof(struct tm));
2130     if (k_gmtime(auth->ctime, &tm_time) &&
2131         ((tr = mktime(&tm_time)) != (time_t)(-1))) {
2132         now = time(&now);
2133         tm_l = localtime(&now);
2134         tl = mktime(tm_l);
2135         tm_g = gmtime(&now);
2136         tg = mktime(tm_g);
2137         tz_offset = tg - tl;
2138
2139         *atimep = (krb5_timestamp)(tr - tz_offset);
2140     }
2141 # ifdef KSSL_DEBUG
2142     fprintf(stderr, "kssl_check_authent: returns %d for client time ",
2143             *atimep);
2144     if (auth->ctime && auth->ctime->length && auth->ctime->data)
2145         fprintf(stderr, "%.*s\n", auth->ctime->length, auth->ctime->data);
2146     else
2147         fprintf(stderr, "NULL\n");
2148 # endif                         /* KSSL_DEBUG */
2149
2150  err:
2151     if (auth)
2152         KRB5_AUTHENT_free((KRB5_AUTHENT *) auth);
2153     if (dec_authent)
2154         KRB5_ENCDATA_free(dec_authent);
2155     if (unenc_authent)
2156         free(unenc_authent);
2157     EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2158     return krb5rc;
2159 }
2160
2161 /*
2162  * Replaces krb5_build_principal_ext(), with varargs length == 2 (svc, host),
2163  * because I don't know how to stub varargs.  Returns krb5_error_code ==
2164  * ENOMEM on alloc error, otherwise passes back newly constructed principal,
2165  * which should be freed by caller.
2166  */
2167 krb5_error_code kssl_build_principal_2(
2168                                           /*
2169                                            * UPDATE
2170                                            */ krb5_context context,
2171                                           /*
2172                                            * OUT
2173                                            */ krb5_principal *princ,
2174                                           /*
2175                                            * IN
2176                                            */ int rlen, const char *realm,
2177                                           /*
2178                                            * IN
2179                                            */ int slen, const char *svc,
2180                                           /*
2181                                            * IN
2182                                            */ int hlen, const char *host)
2183 {
2184     krb5_data *p_data = NULL;
2185     krb5_principal new_p = NULL;
2186     char *new_r = NULL;
2187
2188     if ((p_data = (krb5_data *)calloc(2, sizeof(krb5_data))) == NULL ||
2189         (new_p = (krb5_principal)calloc(1, sizeof(krb5_principal_data)))
2190         == NULL)
2191         goto err;
2192     new_p->length = 2;
2193     new_p->data = p_data;
2194
2195     if ((new_r = calloc(1, rlen + 1)) == NULL)
2196         goto err;
2197     memcpy(new_r, realm, rlen);
2198     krb5_princ_set_realm_length(context, new_p, rlen);
2199     krb5_princ_set_realm_data(context, new_p, new_r);
2200
2201     if ((new_p->data[0].data = calloc(1, slen + 1)) == NULL)
2202         goto err;
2203     memcpy(new_p->data[0].data, svc, slen);
2204     new_p->data[0].length = slen;
2205
2206     if ((new_p->data[1].data = calloc(1, hlen + 1)) == NULL)
2207         goto err;
2208     memcpy(new_p->data[1].data, host, hlen);
2209     new_p->data[1].length = hlen;
2210
2211     krb5_princ_type(context, new_p) = KRB5_NT_UNKNOWN;
2212     *princ = new_p;
2213     return 0;
2214
2215  err:
2216     if (new_p && new_p[0].data)
2217         free(new_p[0].data);
2218     if (new_p && new_p[1].data)
2219         free(new_p[1].data);
2220     if (new_p)
2221         free(new_p);
2222     if (new_r)
2223         free(new_r);
2224     return ENOMEM;
2225 }
2226
2227 void SSL_set0_kssl_ctx(SSL *s, KSSL_CTX *kctx)
2228 {
2229     s->kssl_ctx = kctx;
2230 }
2231
2232 KSSL_CTX *SSL_get0_kssl_ctx(SSL *s)
2233 {
2234     return s->kssl_ctx;
2235 }
2236
2237 char *kssl_ctx_get0_client_princ(KSSL_CTX *kctx)
2238 {
2239     if (kctx)
2240         return kctx->client_princ;
2241     return NULL;
2242 }
2243
2244 #else                           /* !OPENSSL_NO_KRB5 */
2245
2246 # if defined(PEDANTIC) || defined(OPENSSL_SYS_VMS)
2247 static void *dummy = &dummy;
2248 # endif
2249
2250 #endif                          /* !OPENSSL_NO_KRB5 */