admin/add.c

   1 /*
   2  * Copyright (c) 1997-2005 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 static char *
  39 readstring(const char *prompt, char *buf, size_t len)
  40 {
  41     printf("%s", prompt);
  42     if (fgets(buf, len, stdin) == NULL)
  43         return NULL;
  44     buf[strcspn(buf, "\r\n")] = '\0';
  45     return buf;
  46 }
  47
  48 int
  49 kt_add(struct add_options *opt, int argc, char **argv)
  50 {
  51     krb5_error_code ret;
  52     krb5_keytab keytab;
  53     krb5_keytab_entry entry;
  54     char buf[1024];
  55     krb5_enctype enctype;
  56
  57     if((keytab = ktutil_open_keytab()) == NULL)
  58         return 1;
  59
  60     memset(&entry, 0, sizeof(entry));
  61     if(opt->principal_string == NULL) {
  62         if(readstring("Principal: ", buf, sizeof(buf)) == NULL)
  63             return 1;
  64         opt->principal_string = buf;
  65     }
  66     ret = krb5_parse_name(context, opt->principal_string, &entry.principal);
  67     if(ret) {
  68         krb5_warn(context, ret, "%s", opt->principal_string);
  69         goto out;
  70     }
  71     if(opt->enctype_string == NULL) {
  72         if(readstring("Encryption type: ", buf, sizeof(buf)) == NULL) {
  73             ret = 1;
  74             goto out;
  75         }
  76         opt->enctype_string = buf;
  77     }
  78     ret = krb5_string_to_enctype(context, opt->enctype_string, &enctype);
  79     if(ret) {
  80         int t;
  81         if(sscanf(opt->enctype_string, "%d", &t) == 1)
  82             enctype = t;
  83         else {
  84             krb5_warn(context, ret, "%s", opt->enctype_string);
  85             goto out;
  86         }
  87     }
  88     if(opt->kvno_integer == -1) {
  89         if(readstring("Key version: ", buf, sizeof(buf)) == NULL) {
  90             ret = 1;
  91             goto out;
  92         }
  93         if(sscanf(buf, "%u", &opt->kvno_integer) != 1)
  94             goto out;
  95     }
  96     if(opt->password_string == NULL && opt->random_flag == 0) {
  97         if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Password: ", 1)) {
  98             ret = 1;
  99             goto out;
 100         }
 101         opt->password_string = buf;
 102     }
 103     if(opt->password_string) {
 104         if (opt->hex_flag) {
 105             size_t len;
 106             void *data;
 107
 108             len = (strlen(opt->password_string) + 1) / 2;
 109
 110             data = malloc(len);
 111             if (data == NULL) {
 112                 krb5_warn(context, ENOMEM, "malloc");
 113                 goto out;
 114             }
 115
 116             if ((size_t)hex_decode(opt->password_string, data, len) != len) {
 117                 free(data);
 118                 krb5_warn(context, ENOMEM, "hex decode failed");
 119                 goto out;
 120             }
 121
 122             ret = krb5_keyblock_init(context, enctype,
 123                                      data, len, &entry.keyblock);
 124             free(data);
 125         } else if (!opt->salt_flag) {
 126             krb5_salt salt;
 127             krb5_data pw;
 128
 129             salt.salttype         = KRB5_PW_SALT;
 130             salt.saltvalue.data   = NULL;
 131             salt.saltvalue.length = 0;
 132             pw.data = (void*)opt->password_string;
 133             pw.length = strlen(opt->password_string);
 134             ret = krb5_string_to_key_data_salt(context, enctype, pw, salt,
 135                                                &entry.keyblock);
 136         } else {
 137             ret = krb5_string_to_key(context, enctype, opt->password_string,
 138                                      entry.principal, &entry.keyblock);
 139         }
 140         memset (opt->password_string, 0, strlen(opt->password_string));
 141     } else {
 142         ret = krb5_generate_random_keyblock(context, enctype, &entry.keyblock);
 143     }
 144     if(ret) {
 145         krb5_warn(context, ret, "add");
 146         goto out;
 147     }
 148     entry.vno = opt->kvno_integer;
 149     entry.timestamp = time (NULL);
 150     ret = krb5_kt_add_entry(context, keytab, &entry);
 151     if(ret)
 152         krb5_warn(context, ret, "add");
 153  out:
 154     krb5_kt_free_entry(context, &entry);
 155     krb5_kt_close(context, keytab);
 156     return ret != 0;
 157 }