kpasswd/kpasswd.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 "kpasswd_locl.h"
  35 RCSID("$Id$");
  36
  37 static int version_flag;
  38 static int help_flag;
  39 static char *admin_principal_str;
  40
  41 static struct getargs args[] = {
  42     { "admin-principal",        0,   arg_string, &admin_principal_str },
  43     { "version",                0,   arg_flag, &version_flag },
  44     { "help",                   0,   arg_flag, &help_flag }
  45 };
  46
  47 static void
  48 usage (int ret, struct getargs *a, int num_args)
  49 {
  50     arg_printusage (a, num_args, NULL, "[principal ...]");
  51     exit (ret);
  52 }
  53
  54 static int
  55 change_password(krb5_context context,
  56                 krb5_principal principal,
  57                 krb5_ccache id)
  58 {
  59     krb5_data result_code_string, result_string;
  60     int result_code;
  61     krb5_error_code ret;
  62     char pwbuf[BUFSIZ];
  63     char *msg, *name;
  64
  65     krb5_data_zero (&result_code_string);
  66     krb5_data_zero (&result_string);
  67
  68     name = msg = NULL;
  69     if (principal == NULL)
  70         asprintf(&msg, "New password: ");
  71     else {
  72         ret = krb5_unparse_name(context, principal, &name);
  73         if (ret)
  74             krb5_err(context, 1, ret, "krb5_unparse_name");
  75
  76         asprintf(&msg, "New password for %s: ", name);
  77     }
  78
  79     if (msg == NULL)
  80         krb5_errx (context, 1, "out of memory");
  81
  82     ret = UI_UTIL_read_pw_string (pwbuf, sizeof(pwbuf), msg, 1);
  83     free(msg);
  84     if (name)
  85         free(name);
  86     if (ret != 0) {
  87         return 1;
  88     }
  89
  90     ret = krb5_set_password_using_ccache (context, id, pwbuf,
  91                                           principal,
  92                                           &result_code,
  93                                           &result_code_string,
  94                                           &result_string);
  95     if (ret) {
  96         krb5_warn (context, ret, "krb5_set_password_using_ccache");
  97         return 1;
  98     }
  99
 100     printf ("%s%s%.*s\n", krb5_passwd_result_to_string(context, result_code),
 101             result_string.length > 0 ? " : " : "",
 102             (int)result_string.length,
 103             result_string.length > 0 ? (char *)result_string.data : "");
 104
 105     krb5_data_free (&result_code_string);
 106     krb5_data_free (&result_string);
 107
 108     return ret != 0;
 109 }
 110
 111
 112 int
 113 main (int argc, char **argv)
 114 {
 115     krb5_error_code ret;
 116     krb5_context context;
 117     krb5_principal principal;
 118     krb5_principal admin_principal;
 119     int optind = 0;
 120     krb5_get_init_creds_opt *opt;
 121     krb5_creds cred;
 122     krb5_ccache id;
 123     int exit_value;
 124
 125     optind = krb5_program_setup(&context, argc, argv,
 126                                 args, sizeof(args) / sizeof(args[0]), usage);
 127
 128     if (help_flag)
 129         usage (0, args, sizeof(args) / sizeof(args[0]));
 130
 131     if(version_flag){
 132         print_version (NULL);
 133         exit(0);
 134     }
 135
 136     admin_principal = NULL;
 137
 138     argc -= optind;
 139     argv += optind;
 140
 141     ret = krb5_init_context (&context);
 142     if (ret)
 143         errx (1, "krb5_init_context failed: %d", ret);
 144
 145     ret = krb5_get_init_creds_opt_alloc (context, &opt);
 146     if (ret)
 147         krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
 148
 149     krb5_get_init_creds_opt_set_tkt_life (opt, 300);
 150     krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
 151     krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
 152
 153     if (admin_principal_str) {
 154         ret = krb5_parse_name (context, admin_principal_str, &admin_principal);
 155         if (ret)
 156             krb5_err (context, 1, ret, "krb5_parse_name");
 157     } else if (argc == 1) {
 158         ret = krb5_parse_name (context, argv[0], &admin_principal);
 159         if (ret)
 160             krb5_err (context, 1, ret, "krb5_parse_name");
 161     } else {
 162         ret = krb5_get_default_principal (context, &admin_principal);
 163         if (ret)
 164             krb5_err (context, 1, ret, "krb5_get_default_principal");
 165     }
 166
 167     ret = krb5_cc_gen_new(context, &krb5_mcc_ops, &id);
 168
 169     ret = krb5_get_init_creds_password (context,
 170                                         &cred,
 171                                         admin_principal,
 172                                         NULL,
 173                                         krb5_prompter_posix,
 174                                         NULL,
 175                                         0,
 176                                         "kadmin/changepw",
 177                                         opt);
 178     switch (ret) {
 179     case 0:
 180         break;
 181     case KRB5_LIBOS_PWDINTR :
 182         return 1;
 183     case KRB5KRB_AP_ERR_BAD_INTEGRITY :
 184     case KRB5KRB_AP_ERR_MODIFIED :
 185         krb5_errx(context, 1, "Password incorrect");
 186         break;
 187     default:
 188         krb5_err(context, 1, ret, "krb5_get_init_creds");
 189     }
 190
 191     krb5_get_init_creds_opt_free(opt);
 192
 193     ret = krb5_cc_initialize(context, id, admin_principal);
 194     if (ret)
 195         krb5_err(context, 1, ret, "krb5_cc_initialize");
 196
 197     ret = krb5_cc_store_cred(context, id, &cred);
 198     if (ret)
 199         krb5_err(context, 1, ret, "krb5_cc_store_cred");
 200
 201     krb5_free_cred_contents (context, &cred);
 202
 203     if (argc == 0) {
 204         exit_value = change_password(context, NULL, id);
 205     } else {
 206         exit_value = 0;
 207
 208         while (argc-- > 0) {
 209
 210             ret = krb5_parse_name (context, argv[0], &principal);
 211             if (ret)
 212                 krb5_err (context, 1, ret, "krb5_parse_name");
 213
 214             ret = change_password(context, principal, id);
 215             if (ret)
 216                 exit_value = 1;
 217             krb5_free_principal(context, principal);
 218             argv++;
 219         }
 220     }
 221
 222     ret = krb5_cc_destroy(context, id);
 223     if (ret)
 224         krb5_err (context, 1, ret, "krb5_cc_destroy");
 225
 226     krb5_free_context (context);
 227     return ret;
 228 }