lib/gssapi/krb5/set_sec_context_option.c

   1 /*
   2  * Copyright (c) 2004, PADL Software Pty Ltd.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of PADL Software nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  *  glue routine for _gsskrb5_inquire_sec_context_by_oid
  35  */
  36
  37 #include "gsskrb5_locl.h"
  38
  39 static OM_uint32
  40 get_bool(OM_uint32 *minor_status,
  41          const gss_buffer_t value,
  42          int *flag)
  43 {
  44     if (value->value == NULL || value->length != 1) {
  45         *minor_status = EINVAL;
  46         return GSS_S_FAILURE;
  47     }
  48     *flag = *((const char *)value->value) != 0;
  49     return GSS_S_COMPLETE;
  50 }
  51
  52 static OM_uint32
  53 get_string(OM_uint32 *minor_status,
  54            const gss_buffer_t value,
  55            char **str)
  56 {
  57     if (value == NULL || value->length == 0) {
  58         *str = NULL;
  59     } else {
  60         *str = malloc(value->length + 1);
  61         if (*str == NULL) {
  62             *minor_status = 0;
  63             return GSS_S_UNAVAILABLE;
  64         }
  65         memcpy(*str, value->value, value->length);
  66         (*str)[value->length] = '\0';
  67     }
  68     return GSS_S_COMPLETE;
  69 }
  70
  71 static OM_uint32
  72 get_int32(OM_uint32 *minor_status,
  73           const gss_buffer_t value,
  74           OM_uint32 *ret)
  75 {
  76     *minor_status = 0;
  77     if (value == NULL || value->length == 0)
  78         *ret = 0;
  79     else if (value->length == sizeof(*ret))
  80         memcpy(ret, value->value, sizeof(*ret));
  81     else
  82         return GSS_S_UNAVAILABLE;
  83
  84     return GSS_S_COMPLETE;
  85 }
  86
  87 static OM_uint32
  88 set_int32(OM_uint32 *minor_status,
  89           const gss_buffer_t value,
  90           OM_uint32 set)
  91 {
  92     *minor_status = 0;
  93     if (value->length == sizeof(set))
  94         memcpy(value->value, &set, sizeof(set));
  95     else
  96         return GSS_S_UNAVAILABLE;
  97
  98     return GSS_S_COMPLETE;
  99 }
 100
 101 OM_uint32 GSSAPI_CALLCONV
 102 _gsskrb5_set_sec_context_option
 103            (OM_uint32 *minor_status,
 104             gss_ctx_id_t *context_handle,
 105             const gss_OID desired_object,
 106             const gss_buffer_t value)
 107 {
 108     krb5_context context;
 109     OM_uint32 maj_stat;
 110
 111     GSSAPI_KRB5_INIT (&context);
 112
 113     if (value == GSS_C_NO_BUFFER) {
 114         *minor_status = EINVAL;
 115         return GSS_S_FAILURE;
 116     }
 117
 118     if (gss_oid_equal(desired_object, GSS_KRB5_COMPAT_DES3_MIC_X)) {
 119         gsskrb5_ctx ctx;
 120         int flag;
 121
 122         if (*context_handle == GSS_C_NO_CONTEXT) {
 123             *minor_status = EINVAL;
 124             return GSS_S_NO_CONTEXT;
 125         }
 126
 127         maj_stat = get_bool(minor_status, value, &flag);
 128         if (maj_stat != GSS_S_COMPLETE)
 129             return maj_stat;
 130
 131         ctx = (gsskrb5_ctx)*context_handle;
 132         HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 133         if (flag)
 134             ctx->more_flags |= COMPAT_OLD_DES3;
 135         else
 136             ctx->more_flags &= ~COMPAT_OLD_DES3;
 137         ctx->more_flags |= COMPAT_OLD_DES3_SELECTED;
 138         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 139         return GSS_S_COMPLETE;
 140     } else if (gss_oid_equal(desired_object, GSS_KRB5_SET_DNS_CANONICALIZE_X)) {
 141         int flag;
 142
 143         maj_stat = get_bool(minor_status, value, &flag);
 144         if (maj_stat != GSS_S_COMPLETE)
 145             return maj_stat;
 146
 147         krb5_set_dns_canonicalize_hostname(context, flag);
 148         return GSS_S_COMPLETE;
 149
 150     } else if (gss_oid_equal(desired_object, GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X)) {
 151         char *str;
 152
 153         maj_stat = get_string(minor_status, value, &str);
 154         if (maj_stat != GSS_S_COMPLETE)
 155             return maj_stat;
 156
 157         maj_stat = _gsskrb5_register_acceptor_identity(minor_status, str);
 158         free(str);
 159
 160         return maj_stat;
 161
 162     } else if (gss_oid_equal(desired_object, GSS_KRB5_SET_DEFAULT_REALM_X)) {
 163         char *str;
 164
 165         maj_stat = get_string(minor_status, value, &str);
 166         if (maj_stat != GSS_S_COMPLETE)
 167             return maj_stat;
 168         if (str == NULL) {
 169             *minor_status = 0;
 170             return GSS_S_CALL_INACCESSIBLE_READ;
 171         }
 172
 173         krb5_set_default_realm(context, str);
 174         free(str);
 175
 176         *minor_status = 0;
 177         return GSS_S_COMPLETE;
 178
 179     } else if (gss_oid_equal(desired_object, GSS_KRB5_SEND_TO_KDC_X)) {
 180
 181         if (value == NULL || value->length == 0) {
 182             krb5_set_send_to_kdc_func(context, NULL, NULL);
 183         } else {
 184             struct gsskrb5_send_to_kdc c;
 185
 186             if (value->length != sizeof(c)) {
 187                 *minor_status = EINVAL;
 188                 return GSS_S_FAILURE;
 189             }
 190             memcpy(&c, value->value, sizeof(c));
 191             krb5_set_send_to_kdc_func(context,
 192                                       (krb5_send_to_kdc_func)c.func,
 193                                       c.ptr);
 194         }
 195
 196         *minor_status = 0;
 197         return GSS_S_COMPLETE;
 198     } else if (gss_oid_equal(desired_object, GSS_KRB5_CCACHE_NAME_X)) {
 199         char *str;
 200
 201         maj_stat = get_string(minor_status, value, &str);
 202         if (maj_stat != GSS_S_COMPLETE)
 203             return maj_stat;
 204         if (str == NULL) {
 205             *minor_status = 0;
 206             return GSS_S_CALL_INACCESSIBLE_READ;
 207         }
 208
 209         *minor_status = krb5_cc_set_default_name(context, str);
 210         free(str);
 211         if (*minor_status)
 212             return GSS_S_FAILURE;
 213
 214         return GSS_S_COMPLETE;
 215     } else if (gss_oid_equal(desired_object, GSS_KRB5_SET_TIME_OFFSET_X)) {
 216         OM_uint32 offset;
 217         time_t t;
 218
 219         maj_stat = get_int32(minor_status, value, &offset);
 220         if (maj_stat != GSS_S_COMPLETE)
 221             return maj_stat;
 222
 223         t = time(NULL) + offset;
 224
 225         krb5_set_real_time(context, t, 0);
 226
 227         *minor_status = 0;
 228         return GSS_S_COMPLETE;
 229     } else if (gss_oid_equal(desired_object, GSS_KRB5_GET_TIME_OFFSET_X)) {
 230         krb5_timestamp sec;
 231         int32_t usec;
 232         time_t t;
 233
 234         t = time(NULL);
 235
 236         krb5_us_timeofday (context, &sec, &usec);
 237
 238         maj_stat = set_int32(minor_status, value, sec - t);
 239         if (maj_stat != GSS_S_COMPLETE)
 240             return maj_stat;
 241
 242         *minor_status = 0;
 243         return GSS_S_COMPLETE;
 244     } else if (gss_oid_equal(desired_object, GSS_KRB5_PLUGIN_REGISTER_X)) {
 245         struct gsskrb5_krb5_plugin c;
 246
 247         if (value->length != sizeof(c)) {
 248             *minor_status = EINVAL;
 249             return GSS_S_FAILURE;
 250         }
 251         memcpy(&c, value->value, sizeof(c));
 252         krb5_plugin_register(context, c.type, c.name, c.symbol);
 253
 254         *minor_status = 0;
 255         return GSS_S_COMPLETE;
 256     }
 257
 258     *minor_status = EINVAL;
 259     return GSS_S_FAILURE;
 260 }