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,
  52                                       krb5_keytab dst_keytab,
  53                                       krb5_keytab_entry entry)
  54 {
  55     krb5_error_code ret;
  56     krb5_keytab_entry dummy;
  57
  58     char *name_str;
  59     char *etype_str;
  60     ret = krb5_unparse_name (context, entry.principal, &name_str);
  61     if(ret) {
  62         krb5_set_error_message(context, ret, "krb5_unparse_name");
  63         name_str = NULL; /* XXX */
  64         return ret;
  65     }
  66     ret = krb5_enctype_to_string(context, entry.keyblock.keytype, &etype_str);
  67     if(ret) {
  68         krb5_set_error_message(context, ret, "krb5_enctype_to_string");
  69         etype_str = NULL; /* XXX */
  70         return ret;
  71     }
  72     ret = krb5_kt_get_entry(context, dst_keytab,
  73                             entry.principal,
  74                             entry.vno,
  75                             entry.keyblock.keytype,
  76                             &dummy);
  77     if(ret == 0) {
  78         /* this entry is already in the new keytab, so no need to
  79            copy it; if the keyblocks are not the same, something
  80            is weird, so complain about that */
  81         if(!compare_keyblock(&entry.keyblock, &dummy.keyblock)) {
  82                 krb5_warn(context, 0, "entry with different keyvalue "
  83                           "already exists for %s, keytype %s, kvno %d",
  84                           name_str, etype_str, entry.vno);
  85         }
  86         krb5_kt_free_entry(context, &dummy);
  87         krb5_kt_free_entry (context, &entry);
  88         free(name_str);
  89         free(etype_str);
  90         return ret;
  91     } else if(ret != KRB5_KT_NOTFOUND) {
  92         krb5_set_error_message (context, ret, "fetching %s/%s/%u",
  93                                 name_str, etype_str, entry.vno);
  94         krb5_kt_free_entry (context, &entry);
  95         free(name_str);
  96         free(etype_str);
  97         return ret;
  98     }
  99     ret = krb5_kt_add_entry (context, dst_keytab, &entry);
 100     krb5_kt_free_entry (context, &entry);
 101     if (ret) {
 102         krb5_set_error_message (context, ret, "adding %s/%s/%u",
 103                                 name_str, etype_str, entry.vno);
 104         free(name_str);
 105         free(etype_str);
 106         return ret;
 107     }
 108     free(name_str);
 109     free(etype_str);
 110     return ret;
 111 }
 112
 113 krb5_error_code kt_copy(krb5_context context, const char *from, const char *to)
 114 {
 115     krb5_error_code ret;
 116     krb5_keytab src_keytab, dst_keytab;
 117     krb5_kt_cursor cursor;
 118     krb5_keytab_entry entry;
 119
 120     ret = krb5_kt_resolve (context, from, &src_keytab);
 121     if (ret) {
 122         krb5_set_error_message (context, ret, "resolving src keytab `%s'", from);
 123         return ret;
 124     }
 125
 126     ret = krb5_kt_resolve (context, to, &dst_keytab);
 127     if (ret) {
 128         krb5_kt_close (context, src_keytab);
 129         krb5_set_error_message (context, ret, "resolving dst keytab `%s'", to);
 130         return ret;
 131     }
 132
 133     ret = krb5_kt_start_seq_get (context, src_keytab, &cursor);
 134     if (ret) {
 135         krb5_set_error_message (context, ret, "krb5_kt_start_seq_get %s", from);
 136         goto out;
 137     }
 138
 139     while((ret = krb5_kt_next_entry(context, src_keytab,
 140                                     &entry, &cursor)) == 0) {
 141         ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
 142         if (ret) {
 143             break;
 144         }
 145     }
 146     krb5_kt_end_seq_get (context, src_keytab, &cursor);
 147
 148   out:
 149     krb5_kt_close (context, src_keytab);
 150     krb5_kt_close (context, dst_keytab);
 151     if (ret == KRB5_KT_END) {
 152         return 0;
 153     } else if (ret == 0) {
 154         return EINVAL;
 155     }
 156     return ret;
 157 }
 158
 159 krb5_error_code kt_copy_one_principal(krb5_context context,
 160                                       const char *from,
 161                                       const char *to,
 162                                       const char *principal,
 163                                       krb5_kvno kvno,
 164                                       krb5_enctype *enctypes)
 165 {
 166     krb5_error_code ret;
 167     krb5_keytab src_keytab, dst_keytab;
 168     krb5_keytab_entry entry;
 169     krb5_principal princ;
 170     int i;
 171     bool found_one = false;
 172
 173     ret = krb5_parse_name (context, principal, &princ);
 174     if(ret) {
 175             krb5_set_error_message(context, ret, "krb5_unparse_name");
 176             return ret;
 177     }
 178
 179     ret = krb5_kt_resolve (context, from, &src_keytab);
 180     if (ret) {
 181         krb5_set_error_message(context, ret, "resolving src keytab `%s'", from);
 182         return ret;
 183     }
 184
 185     ret = krb5_kt_resolve (context, to, &dst_keytab);
 186     if (ret) {
 187         krb5_kt_close (context, src_keytab);
 188         krb5_set_error_message(context, ret, "resolving dst keytab `%s'", to);
 189         return ret;
 190     }
 191
 192     for (i=0; enctypes[i]; i++) {
 193         ret = krb5_kt_get_entry(context, src_keytab,
 194                                 princ,
 195                                 kvno,
 196                                 enctypes[i],
 197                                 &entry);
 198         if (ret == KRB5_KT_NOTFOUND) {
 199             continue;
 200         } else if (ret) {
 201             break;
 202         }
 203         found_one = true;
 204         ret = copy_one_entry(context, src_keytab, dst_keytab, entry);
 205         if (ret) {
 206             break;
 207         }
 208     }
 209     if (ret == KRB5_KT_NOTFOUND) {
 210         if (!found_one) {
 211             char *princ_string;
 212             int ret2 = krb5_unparse_name (context, princ, &princ_string);
 213             if (ret2) {
 214                 krb5_set_error_message(context, ret,
 215                                         "failed to fetch principal %s",
 216                                         princ_string);
 217             }
 218         } else {
 219             /* Not finding an enc type is not an error,
 220              * as long as we copied one for the principal */
 221             ret = 0;
 222         }
 223     }
 224
 225     krb5_kt_close (context, src_keytab);
 226     krb5_kt_close (context, dst_keytab);
 227     return ret;
 228 }