source4/auth/kerberos/keytab_copy.c

   1 /*
   2  * Copyright (c) 1997-2004 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 "includes.h"
  35 #include "system/kerberos.h"
  36 #include "auth/kerberos/kerberos.h"
  37
  38 static const krb5_boolean verbose_flag = FALSE;
  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 krb5_error_code kt_copy (krb5_context context, const char *from, const char *to)
  51 {
  52     krb5_error_code ret;
  53     krb5_keytab src_keytab, dst_keytab;
  54     krb5_kt_cursor cursor;
  55     krb5_keytab_entry entry, dummy;
  56
  57     ret = krb5_kt_resolve (context, from, &src_keytab);
  58     if (ret) {
  59         krb5_warn (context, ret, "resolving src keytab `%s'", from);
  60         return 1;
  61     }
  62
  63     ret = krb5_kt_resolve (context, to, &dst_keytab);
  64     if (ret) {
  65         krb5_kt_close (context, src_keytab);
  66         krb5_warn (context, ret, "resolving dst keytab `%s'", to);
  67         return 1;
  68     }
  69
  70     ret = krb5_kt_start_seq_get (context, src_keytab, &cursor);
  71     if (ret) {
  72         krb5_warn (context, ret, "krb5_kt_start_seq_get %s", from);
  73         goto out;
  74     }
  75
  76     if (verbose_flag)
  77         fprintf(stderr, "copying %s to %s\n", from, to);
  78
  79     while((ret = krb5_kt_next_entry(context, src_keytab,
  80                                     &entry, &cursor)) == 0) {
  81         char *name_str;
  82         char *etype_str;
  83         ret = krb5_unparse_name (context, entry.principal, &name_str);
  84         if(ret) {
  85             krb5_warn(context, ret, "krb5_unparse_name");
  86             name_str = NULL; /* XXX */
  87         }
  88         ret = krb5_enctype_to_string(context, entry.keyblock.keytype, &etype_str);
  89         if(ret) {
  90             krb5_warn(context, ret, "krb5_enctype_to_string");
  91             etype_str = NULL; /* XXX */
  92         }
  93         ret = krb5_kt_get_entry(context, dst_keytab,
  94                                 entry.principal,
  95                                 entry.vno,
  96                                 entry.keyblock.keytype,
  97                                 &dummy);
  98         if(ret == 0) {
  99             /* this entry is already in the new keytab, so no need to
 100                copy it; if the keyblocks are not the same, something
 101                is weird, so complain about that */
 102             if(!compare_keyblock(&entry.keyblock, &dummy.keyblock)) {
 103                 krb5_warnx(context, "entry with different keyvalue "
 104                            "already exists for %s, keytype %s, kvno %d",
 105                            name_str, etype_str, entry.vno);
 106             }
 107             krb5_kt_free_entry(context, &dummy);
 108             krb5_kt_free_entry (context, &entry);
 109             free(name_str);
 110             free(etype_str);
 111             continue;
 112         } else if(ret != KRB5_KT_NOTFOUND) {
 113             krb5_warn (context, ret, "%s: fetching %s/%s/%u",
 114                        to, name_str, etype_str, entry.vno);
 115             krb5_kt_free_entry (context, &entry);
 116             free(name_str);
 117             free(etype_str);
 118             break;
 119         }
 120         if (verbose_flag)
 121             fprintf (stderr, "copying %s, keytype %s, kvno %d\n", name_str,
 122                      etype_str, entry.vno);
 123         ret = krb5_kt_add_entry (context, dst_keytab, &entry);
 124         krb5_kt_free_entry (context, &entry);
 125         if (ret) {
 126             krb5_warn (context, ret, "%s: adding %s/%s/%u",
 127                        to, name_str, etype_str, entry.vno);
 128             free(name_str);
 129             free(etype_str);
 130             break;
 131         }
 132         free(name_str);
 133         free(etype_str);
 134     }
 135     krb5_kt_end_seq_get (context, src_keytab, &cursor);
 136
 137   out:
 138     krb5_kt_close (context, src_keytab);
 139     krb5_kt_close (context, dst_keytab);
 140     if (ret == KRB5_KT_END) {
 141         return 0;
 142     } else if (ret == 0) {
 143         return EINVAL;
 144     }
 145     return ret;
 146 }