lib/gssapi/krb5/compat.c

   1 /*
   2  * Copyright (c) 2003 - 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "gssapi_locl.h"
  35
  36 RCSID("$Id$");
  37
  38
  39 krb5_error_code
  40 _gss_check_compat(OM_uint32 *minor_status, gss_name_t name,
  41                   const char *option, krb5_boolean *compat,
  42                   krb5_boolean match_val)
  43 {
  44     krb5_error_code ret = 0;
  45     char **p, **q;
  46     krb5_principal match;
  47
  48
  49     p = krb5_config_get_strings(gssapi_krb5_context, NULL, "gssapi",
  50                                 option, NULL);
  51     if(p == NULL)
  52         return 0;
  53
  54     match = NULL;
  55     for(q = p; *q; q++) {
  56         ret = krb5_parse_name(gssapi_krb5_context, *q, &match);
  57         if (ret)
  58             break;
  59
  60         if (krb5_principal_match(gssapi_krb5_context, name, match)) {
  61             *compat = match_val;
  62             break;
  63         }
  64
  65         krb5_free_principal(gssapi_krb5_context, match);
  66         match = NULL;
  67     }
  68     if (match)
  69         krb5_free_principal(gssapi_krb5_context, match);
  70     krb5_config_free_strings(p);
  71
  72     if (ret) {
  73         if (minor_status)
  74             *minor_status = ret;
  75         return GSS_S_FAILURE;
  76     }
  77
  78     return 0;
  79 }
  80
  81 /*
  82  * ctx->ctx_id_mutex is assumed to be locked
  83  */
  84
  85 OM_uint32
  86 _gss_DES3_get_mic_compat(OM_uint32 *minor_status, gss_ctx_id_t ctx)
  87 {
  88     krb5_boolean use_compat = FALSE;
  89     OM_uint32 ret;
  90
  91     if ((ctx->more_flags & COMPAT_OLD_DES3_SELECTED) == 0) {
  92         ret = _gss_check_compat(minor_status, ctx->target,
  93                                 "broken_des3_mic", &use_compat, TRUE);
  94         if (ret)
  95             return ret;
  96         ret = _gss_check_compat(minor_status, ctx->target,
  97                                 "correct_des3_mic", &use_compat, FALSE);
  98         if (ret)
  99             return ret;
 100
 101         if (use_compat)
 102             ctx->more_flags |= COMPAT_OLD_DES3;
 103         ctx->more_flags |= COMPAT_OLD_DES3_SELECTED;
 104     }
 105     return 0;
 106 }
 107
 108 OM_uint32
 109 gss_krb5_compat_des3_mic(OM_uint32 *minor_status, gss_ctx_id_t ctx, int on)
 110 {
 111     *minor_status = 0;
 112
 113     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 114     if (on) {
 115         ctx->more_flags |= COMPAT_OLD_DES3;
 116     } else {
 117         ctx->more_flags &= ~COMPAT_OLD_DES3;
 118     }
 119     ctx->more_flags |= COMPAT_OLD_DES3_SELECTED;
 120     HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 121
 122     return 0;
 123 }
 124
 125 /*
 126  * For compatability with the Windows SPNEGO implementation, the
 127  * default is to ignore the mechListMIC unless the initiator specified
 128  * CFX or configured in krb5.conf with the option
 129  *      [gssapi]require_mechlist_mic=target-principal-pattern.
 130  * The option is valid for both initiator and acceptor.
 131  */
 132 OM_uint32
 133 _gss_spnego_require_mechlist_mic(OM_uint32 *minor_status,
 134                                  gss_ctx_id_t ctx,
 135                                  krb5_boolean *require_mic)
 136 {
 137     OM_uint32 ret;
 138     int is_cfx = 0;
 139
 140     gsskrb5_is_cfx(ctx, &is_cfx);
 141     if (is_cfx) {
 142         /* CFX session key was used */
 143         *require_mic = TRUE;
 144     } else {
 145         *require_mic = FALSE;
 146         ret = _gss_check_compat(minor_status, ctx->target,
 147                                 "require_mechlist_mic",
 148                                 require_mic, TRUE);
 149         if (ret)
 150             return ret;
 151     }
 152     *minor_status = 0;
 153     return GSS_S_COMPLETE;
 154 }