source4/auth/kerberos/keytab_copy.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 "system/kerberos.h"
  38 #include "auth/kerberos/kerberos.h"
  39
  40 static krb5_boolean
  41 compare_keyblock(const krb5_keyblock *a, const krb5_keyblock *b)
  42 {
  43     if(a->keytype != b->keytype ||
  44        a->keyvalue.length != b->keyvalue.length ||
  45        memcmp(a->keyvalue.data, b->keyvalue.data, a->keyvalue.length) != 0)
  46         return FALSE;
  47     return TRUE;
  48 }
  49
  50 static krb5_error_code copy_one_entry(krb5_context context,
  51                                       krb5_keytab src_keytab, krb5_keytab dst_keytab, krb5_keytab_entry entry)
  52 {
  53     krb5_error_code ret;
  54     krb5_keytab_entry dummy;
  55
  56     char *name_str;
  57     char *etype_str;
  58     ret = krb5_unparse_name (context, entry.principal, &name_str);
  59     if(ret) {
  60         krb5_set_error_message(context, ret, "krb5_unparse_name");
  61         name_str = NULL; /* XXX */
  62         return ret;
  63     }
  64     ret = krb5_enctype_to_string(context, entry.keyblock.keytype, &etype_str);
  65     if(ret) {
  66         krb5_set_error_message(context, ret, "krb5_enctype_to_string");
  67         etype_str = NULL; /* XXX */
  68         return ret;
  69     }
  70     ret = krb5_kt_get_entry(context, dst_keytab,
  71                             entry.principal,
  72                             entry.vno,
  73                             entry.keyblock.keytype,
  74                             &dummy);
  75     if(ret == 0) {
  76         /* this entry is already in the new keytab, so no need to
  77            copy it; if the keyblocks are not the same, something
  78            is weird, so complain about that */
  79         if(!compare_keyblock(&entry.keyblock, &dummy.keyblock)) {
  80                 krb5_warn(context, 0, "entry with different keyvalue "
  81                           "already exists for %s, keytype %s, kvno %d",
  82                           name_str, etype_str, entry.vno);
  83         }
  84         krb5_kt_free_entry(context, &dummy);
  85         krb5_kt_free_entry (context, &entry);
  86         free(name_str);
  87         free(etype_str);
  88         return ret;
  89     } else if(ret != KRB5_KT_NOTFOUND) {
  90         krb5_set_error_message (context, ret, "fetching %s/%s/%u",
  91                                 name_str, etype_str, entry.vno);
  92         krb5_kt_free_entry (context, &entry);
  93         free(name_str);
  94         free(etype_str);
  95         return ret;
  96     }
  97     ret = krb5_kt_add_entry (context, dst_keytab, &entry);
  98     krb5_kt_free_entry (context, &entry);
  99     if (ret) {
 100         krb5_set_error_message (context, ret, "adding %s/%s/%u",
 101                                 name_str, etype_str, entry.vno);
 102         free(name_str);
 103         free(etype_str);
 104         return ret;
 105     }
 106     free(name_str);
 107     free(etype_str);
 108     return ret;
 109 }
 110
 111 krb5_error_code kt_copy (krb5_context context, const char *from, const char *to)
 112 {
 113     krb5_error_code ret;
 114     krb5_keytab src_keytab, dst_keytab;
 115     krb5_kt_cursor cursor;
 116     krb5_keytab_entry entry;
 117
 118     ret = krb5_kt_resolve (context, from, &src_keytab);
 119     if (ret) {
 120         krb5_set_error_message (context, ret, "resolving src keytab `%s'", from);
 121         return ret;
 122     }
 123
 124     ret = krb5_kt_resolve (context, to, &dst_keytab);
 125     if (ret) {
 126         krb5_kt_close (context, src_keytab);
 127         krb5_set_error_message (context, ret, "resolving dst keytab `%s'", to);
 128         return ret;
 129     }
 130
 131     ret = krb5_kt_start_seq_get (context, src_keytab, &cursor);
 132     if (ret) {
 133         krb5_set_error_message (context, ret, "krb5_kt_start_seq_get %s", from);
 134         goto out;
 135     }
 136
 137     while((ret = krb5_kt_next_entry(context, src_keytab,
 138                                     &entry, &cursor)) == 0) {
 139         ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
 140         if (ret) {
 141             break;
 142         }
 143     }
 144     krb5_kt_end_seq_get (context, src_keytab, &cursor);
 145
 146   out:
 147     krb5_kt_close (context, src_keytab);
 148     krb5_kt_close (context, dst_keytab);
 149     if (ret == KRB5_KT_END) {
 150         return 0;
 151     } else if (ret == 0) {
 152         return EINVAL;
 153     }
 154     return ret;
 155 }
 156
 157 krb5_error_code kt_copy_one_principal (krb5_context context, const char *from, const char *to,
 158                                        const char *principal, krb5_kvno kvno, krb5_enctype *enctypes)
 159 {
 160     krb5_error_code ret;
 161     krb5_keytab src_keytab, dst_keytab;
 162     krb5_keytab_entry entry;
 163     krb5_principal princ;
 164     int i;
 165     bool found_one = false;
 166
 167     ret = krb5_parse_name (context, principal, &princ);
 168     if(ret) {
 169             krb5_set_error_message(context, ret, "krb5_unparse_name");
 170             return ret;
 171     }
 172
 173     ret = krb5_kt_resolve (context, from, &src_keytab);
 174     if (ret) {
 175         krb5_set_error_message(context, ret, "resolving src keytab `%s'", from);
 176         return ret;
 177     }
 178
 179     ret = krb5_kt_resolve (context, to, &dst_keytab);
 180     if (ret) {
 181         krb5_kt_close (context, src_keytab);
 182         krb5_set_error_message(context, ret, "resolving dst keytab `%s'", to);
 183         return ret;
 184     }
 185
 186     for (i=0; enctypes[i]; i++) {
 187         ret = krb5_kt_get_entry(context, src_keytab,
 188                                 princ,
 189                                 kvno,
 190                                 enctypes[i],
 191                                 &entry);
 192         if (ret == KRB5_KT_NOTFOUND) {
 193             continue;
 194         } else if (ret) {
 195             break;
 196         }
 197         found_one = true;
 198         ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
 199         if (ret) {
 200             break;
 201         }
 202     }
 203     if (ret == KRB5_KT_NOTFOUND) {
 204         if (!found_one) {
 205             char *princ_string;
 206             int ret2 = krb5_unparse_name (context, princ, &princ_string);
 207             if (ret2) {
 208                 krb5_set_error_message(context, ret, "failed to fetch principal %s", princ_string);
 209             }
 210         } else {
 211             /* Not finding an enc type is not an error, as long as we copied one for the principal */
 212             ret = 0;
 213         }
 214     }
 215
 216     krb5_kt_close (context, src_keytab);
 217     krb5_kt_close (context, dst_keytab);
 218     return ret;
 219 }