admin/purge.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 "ktutil_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 /*
  39  * keep track of the highest version for every principal.
  40  */
  41
  42 struct e {
  43     krb5_principal principal;
  44     int max_vno;
  45     time_t timestamp;
  46     struct e *next;
  47 };
  48
  49 static struct e *
  50 get_entry (krb5_principal princ, struct e *head)
  51 {
  52     struct e *e;
  53
  54     for (e = head; e != NULL; e = e->next)
  55         if (krb5_principal_compare (context, princ, e->principal))
  56             return e;
  57     return NULL;
  58 }
  59
  60 static void
  61 add_entry (krb5_principal princ, int vno, time_t timestamp, struct e **head)
  62 {
  63     krb5_error_code ret;
  64     struct e *e;
  65
  66     e = get_entry (princ, *head);
  67     if (e != NULL) {
  68         if(e->max_vno < vno) {
  69             e->max_vno = vno;
  70             e->timestamp = timestamp;
  71         }
  72         return;
  73     }
  74     e = malloc (sizeof (*e));
  75     if (e == NULL)
  76         krb5_errx (context, 1, "malloc: out of memory");
  77     ret = krb5_copy_principal (context, princ, &e->principal);
  78     if (ret)
  79         krb5_err (context, 1, ret, "krb5_copy_principal");
  80     e->max_vno = vno;
  81     e->timestamp = timestamp;
  82     e->next    = *head;
  83     *head      = e;
  84 }
  85
  86 static void
  87 delete_list (struct e *head)
  88 {
  89     while (head != NULL) {
  90         struct e *next = head->next;
  91         krb5_free_principal (context, head->principal);
  92         free (head);
  93         head = next;
  94     }
  95 }
  96
  97 /*
  98  * Remove all entries that have newer versions and that are older
  99  * than `age'
 100  */
 101
 102 int
 103 kt_purge(struct purge_options *opt, int argc, char **argv)
 104 {
 105     krb5_error_code ret = 0;
 106     krb5_kt_cursor cursor;
 107     krb5_keytab keytab;
 108     krb5_keytab_entry entry;
 109     int age;
 110     struct e *head = NULL;
 111     time_t judgement_day;
 112
 113     age = parse_time(opt->age_string, "s");
 114     if(age < 0) {
 115         krb5_warnx(context, "unparasable time `%s'", opt->age_string);
 116         return 1;
 117     }
 118
 119     if((keytab = ktutil_open_keytab()) == NULL)
 120         return 1;
 121
 122     ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 123     if(ret){
 124         krb5_warn(context, ret, "%s", keytab_string);
 125         goto out;
 126     }
 127
 128     while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0) {
 129         add_entry (entry.principal, entry.vno, entry.timestamp, &head);
 130         krb5_kt_free_entry(context, &entry);
 131     }
 132     krb5_kt_end_seq_get(context, keytab, &cursor);
 133
 134     judgement_day = time (NULL);
 135
 136     ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 137     if(ret){
 138         krb5_warn(context, ret, "%s", keytab_string);
 139         goto out;
 140     }
 141
 142     while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0) {
 143         struct e *e = get_entry (entry.principal, head);
 144
 145         if (e == NULL) {
 146             krb5_warnx (context, "ignoring extra entry");
 147             continue;
 148         }
 149
 150         if (entry.vno < e->max_vno
 151             && judgement_day - e->timestamp > age) {
 152             if (verbose_flag) {
 153                 char *name_str;
 154
 155                 krb5_unparse_name (context, entry.principal, &name_str);
 156                 printf ("removing %s vno %d\n", name_str, entry.vno);
 157                 free (name_str);
 158             }
 159             ret = krb5_kt_remove_entry (context, keytab, &entry);
 160             if (ret)
 161                 krb5_warn (context, ret, "remove");
 162         }
 163         krb5_kt_free_entry(context, &entry);
 164     }
 165     ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 166
 167     delete_list (head);
 168
 169  out:
 170     krb5_kt_close (context, keytab);
 171     return ret != 0;
 172 }