lib/krb5_wrap/keytab_util.c

   1 /*
   2  * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * Copyright (c) 2011 Andrew Bartlett
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "includes.h"
  37 #include "krb5_samba.h"
  38
  39 static krb5_boolean
  40 compare_keyblock(const krb5_keyblock *a, const krb5_keyblock *b)
  41 {
  42     if (KRB5_KEY_TYPE(a) != KRB5_KEY_TYPE(b) ||
  43         KRB5_KEY_LENGTH(a) != KRB5_KEY_LENGTH(b) ||
  44         memcmp(KRB5_KEY_DATA(a), KRB5_KEY_DATA(b), KRB5_KEY_LENGTH(a)) != 0)
  45         return false;
  46     return true;
  47 }
  48
  49 static krb5_error_code copy_one_entry(krb5_context context,
  50                                       krb5_keytab src_keytab,
  51                                       krb5_keytab dst_keytab,
  52                                       krb5_keytab_entry entry)
  53 {
  54     krb5_error_code ret;
  55     krb5_keytab_entry dummy;
  56
  57     char *name_str;
  58     char *etype_str;
  59     ret = krb5_unparse_name (context, entry.principal, &name_str);
  60     if(ret) {
  61         krb5_set_error_message(context, ret, "krb5_unparse_name");
  62         name_str = NULL; /* XXX */
  63         return ret;
  64     }
  65     ret = smb_krb5_enctype_to_string(context,
  66                                         KRB5_KEY_TYPE(KRB5_KT_KEY(&entry)),
  67                                         &etype_str);
  68     if(ret) {
  69         krb5_set_error_message(context, ret, "krb5_enctype_to_string");
  70         etype_str = NULL; /* XXX */
  71         return ret;
  72     }
  73     ret = krb5_kt_get_entry(context, dst_keytab,
  74                             entry.principal,
  75                             entry.vno,
  76                             KRB5_KEY_TYPE(KRB5_KT_KEY(&entry)),
  77                             &dummy);
  78     if(ret == 0) {
  79         /* this entry is already in the new keytab, so no need to
  80            copy it; if the keyblocks are not the same, something
  81            is weird, so complain about that */
  82         if (!compare_keyblock(KRB5_KT_KEY(&entry), KRB5_KT_KEY(&dummy))) {
  83                 DEBUG(2, ("copy_one_entry: entry with different keyvalue "
  84                           "already exists for %s, keytype %s, kvno %d",
  85                           name_str, etype_str, entry.vno));
  86         }
  87         krb5_kt_free_entry(context, &dummy);
  88         krb5_kt_free_entry (context, &entry);
  89         free(name_str);
  90         free(etype_str);
  91         return ret;
  92     } else if(ret != KRB5_KT_NOTFOUND) {
  93         krb5_set_error_message (context, ret, "fetching %s/%s/%u",
  94                                 name_str, etype_str, entry.vno);
  95         krb5_kt_free_entry (context, &entry);
  96         free(name_str);
  97         free(etype_str);
  98         return ret;
  99     }
 100     ret = krb5_kt_add_entry (context, dst_keytab, &entry);
 101     krb5_kt_free_entry (context, &entry);
 102     if (ret) {
 103         krb5_set_error_message (context, ret, "adding %s/%s/%u",
 104                                 name_str, etype_str, entry.vno);
 105         free(name_str);
 106         free(etype_str);
 107         return ret;
 108     }
 109     free(name_str);
 110     free(etype_str);
 111     return ret;
 112 }
 113
 114 krb5_error_code kt_copy(krb5_context context, const char *from, const char *to)
 115 {
 116     krb5_error_code ret;
 117     krb5_keytab src_keytab, dst_keytab;
 118     krb5_kt_cursor cursor;
 119     krb5_keytab_entry entry;
 120
 121     ret = krb5_kt_resolve (context, from, &src_keytab);
 122     if (ret) {
 123         krb5_set_error_message (context, ret, "resolving src keytab `%s'", from);
 124         return ret;
 125     }
 126
 127     ret = krb5_kt_resolve (context, to, &dst_keytab);
 128     if (ret) {
 129         krb5_kt_close (context, src_keytab);
 130         krb5_set_error_message (context, ret, "resolving dst keytab `%s'", to);
 131         return ret;
 132     }
 133
 134     ret = krb5_kt_start_seq_get (context, src_keytab, &cursor);
 135     if (ret) {
 136         krb5_set_error_message (context, ret, "krb5_kt_start_seq_get %s", from);
 137         goto out;
 138     }
 139
 140     while((ret = krb5_kt_next_entry(context, src_keytab,
 141                                     &entry, &cursor)) == 0) {
 142         ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
 143         if (ret) {
 144             break;
 145         }
 146     }
 147     krb5_kt_end_seq_get (context, src_keytab, &cursor);
 148
 149   out:
 150     krb5_kt_close (context, src_keytab);
 151     krb5_kt_close (context, dst_keytab);
 152     if (ret == KRB5_KT_END) {
 153         return 0;
 154     } else if (ret == 0) {
 155         return EINVAL;
 156     }
 157     return ret;
 158 }
 159
 160 krb5_error_code kt_copy_one_principal(krb5_context context,
 161                                       const char *from,
 162                                       const char *to,
 163                                       const char *principal,
 164                                       krb5_kvno kvno,
 165                                       krb5_enctype *enctypes)
 166 {
 167     krb5_error_code ret;
 168     krb5_keytab src_keytab, dst_keytab;
 169     krb5_keytab_entry entry;
 170     krb5_principal princ;
 171     int i;
 172     bool found_one = false;
 173
 174     ret = krb5_parse_name (context, principal, &princ);
 175     if(ret) {
 176             krb5_set_error_message(context, ret, "krb5_unparse_name");
 177             return ret;
 178     }
 179
 180     ret = krb5_kt_resolve (context, from, &src_keytab);
 181     if (ret) {
 182         krb5_set_error_message(context, ret, "resolving src keytab `%s'", from);
 183         return ret;
 184     }
 185
 186     ret = krb5_kt_resolve (context, to, &dst_keytab);
 187     if (ret) {
 188         krb5_kt_close (context, src_keytab);
 189         krb5_set_error_message(context, ret, "resolving dst keytab `%s'", to);
 190         return ret;
 191     }
 192
 193     for (i=0; enctypes[i]; i++) {
 194         ret = krb5_kt_get_entry(context, src_keytab,
 195                                 princ,
 196                                 kvno,
 197                                 enctypes[i],
 198                                 &entry);
 199         if (ret == KRB5_KT_NOTFOUND) {
 200             continue;
 201         } else if (ret) {
 202             break;
 203         }
 204         found_one = true;
 205         ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
 206         if (ret) {
 207             break;
 208         }
 209     }
 210     if (ret == KRB5_KT_NOTFOUND) {
 211         if (!found_one) {
 212             char *princ_string;
 213             int ret2 = krb5_unparse_name (context, princ, &princ_string);
 214             if (ret2) {
 215                 krb5_set_error_message(context, ret,
 216                                         "failed to fetch principal %s",
 217                                         princ_string);
 218             }
 219         } else {
 220             /* Not finding an enc type is not an error,
 221              * as long as we copied one for the principal */
 222             ret = 0;
 223         }
 224     }
 225
 226     krb5_kt_close (context, src_keytab);
 227     krb5_kt_close (context, dst_keytab);
 228     return ret;
 229 }
 230
 231 #if !defined(HAVE_KRB5_KT_COMPARE)
 232 krb5_boolean smb_krb5_kt_compare(krb5_context context,
 233                                  krb5_keytab_entry *entry,
 234                                  krb5_const_principal principal,
 235                                  krb5_kvno kvno,
 236                                  krb5_enctype enctype)
 237 {
 238         if (principal) {
 239                 if (!krb5_principal_compare(context,
 240                                             entry->principal, principal)) {
 241                         return false;
 242                 }
 243         }
 244         if (kvno) {
 245                 if (entry->vno != kvno) {
 246                         return false;
 247                 }
 248         }
 249         if (enctype) {
 250                 if (KRB5_KEY_TYPE(KRB5_KT_KEY(entry)) != enctype) {
 251                         return false;
 252                 }
 253         }
 254
 255         return true;
 256 }
 257 #endif
 258