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 static char *cred_cache_str;
  41
  42 static struct getargs args[] = {
  43     { "admin-principal",        0,   arg_string, &admin_principal_str, NULL,
  44          NULL },
  45     { "cache",                  'c', arg_string, &cred_cache_str, NULL, NULL },
  46     { "version",                0,   arg_flag, &version_flag, NULL, NULL },
  47     { "help",                   0,   arg_flag, &help_flag, NULL, NULL }
  48 };
  49
  50 static void
  51 usage (int ret, struct getargs *a, int num_args)
  52 {
  53     arg_printusage (a, num_args, NULL, "[principal ...]");
  54     exit (ret);
  55 }
  56
  57 static int
  58 change_password(krb5_context context,
  59                 krb5_principal principal,
  60                 krb5_ccache id)
  61 {
  62     krb5_data result_code_string, result_string;
  63     int result_code;
  64     krb5_error_code ret;
  65     char pwbuf[BUFSIZ];
  66     char *msg, *name;
  67     int aret;
  68
  69     krb5_data_zero (&result_code_string);
  70     krb5_data_zero (&result_string);
  71
  72     name = msg = NULL;
  73     if (principal == NULL)
  74         aret = asprintf(&msg, "New password: ");
  75     else {
  76         ret = krb5_unparse_name(context, principal, &name);
  77         if (ret)
  78             krb5_err(context, 1, ret, "krb5_unparse_name");
  79
  80         aret = asprintf(&msg, "New password for %s: ", name);
  81     }
  82
  83     if (aret == -1 || msg == NULL)
  84         krb5_errx (context, 1, "out of memory");
  85
  86     ret = UI_UTIL_read_pw_string (pwbuf, sizeof(pwbuf), msg,
  87                                   UI_UTIL_FLAG_VERIFY);
  88     free(msg);
  89     if (name)
  90         free(name);
  91     if (ret != 0) {
  92         return 1;
  93     }
  94
  95     ret = krb5_set_password_using_ccache (context, id, pwbuf,
  96                                           principal,
  97                                           &result_code,
  98                                           &result_code_string,
  99                                           &result_string);
 100     if (ret) {
 101         krb5_warn (context, ret, "krb5_set_password_using_ccache");
 102         return 1;
 103     }
 104
 105     printf ("%s%s%.*s\n", krb5_passwd_result_to_string(context, result_code),
 106             result_string.length > 0 ? " : " : "",
 107             (int)result_string.length,
 108             result_string.length > 0 ? (char *)result_string.data : "");
 109
 110     krb5_data_free (&result_code_string);
 111     krb5_data_free (&result_string);
 112
 113     return ret != 0;
 114 }
 115
 116
 117 int
 118 main (int argc, char **argv)
 119 {
 120     krb5_error_code ret;
 121     krb5_context context;
 122     krb5_principal principal;
 123     krb5_get_init_creds_opt *opt;
 124     krb5_ccache id = NULL;
 125     int exit_value;
 126     int optidx = 0;
 127
 128     setprogname(argv[0]);
 129
 130     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 131         usage(1, args, sizeof(args) / sizeof(args[0]));
 132     if (help_flag)
 133         usage(0, args, sizeof(args) / sizeof(args[0]));
 134     if (version_flag) {
 135         print_version(NULL);
 136         return 0;
 137     }
 138     argc -= optidx;
 139     argv += optidx;
 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 (cred_cache_str) {
 154         ret = krb5_cc_resolve(context, cred_cache_str, &id);
 155         if (ret)
 156             krb5_err (context, 1, ret, "krb5_cc_resolve");
 157     } else {
 158         ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, &id);
 159         if (ret)
 160             krb5_err (context, 1, ret, "krb5_cc_new_unique");
 161     }
 162
 163     if (cred_cache_str == NULL) {
 164         krb5_principal admin_principal = NULL;
 165         krb5_creds cred;
 166
 167         if (admin_principal_str) {
 168             ret = krb5_parse_name (context, admin_principal_str,
 169                                    &admin_principal);
 170             if (ret)
 171                 krb5_err (context, 1, ret, "krb5_parse_name");
 172         } else if (argc == 1) {
 173             ret = krb5_parse_name (context, argv[0], &admin_principal);
 174             if (ret)
 175                 krb5_err (context, 1, ret, "krb5_parse_name");
 176         } else {
 177             ret = krb5_get_default_principal (context, &admin_principal);
 178             if (ret)
 179                 krb5_err (context, 1, ret, "krb5_get_default_principal");
 180         }
 181
 182         ret = krb5_get_init_creds_password (context,
 183                                             &cred,
 184                                             admin_principal,
 185                                             NULL,
 186                                             krb5_prompter_posix,
 187                                             NULL,
 188                                             0,
 189                                             "kadmin/changepw",
 190                                             opt);
 191         switch (ret) {
 192         case 0:
 193             break;
 194         case KRB5_LIBOS_PWDINTR :
 195             return 1;
 196         case KRB5KRB_AP_ERR_BAD_INTEGRITY :
 197         case KRB5KRB_AP_ERR_MODIFIED :
 198             krb5_errx(context, 1, "Password incorrect");
 199             break;
 200         default:
 201             krb5_err(context, 1, ret, "krb5_get_init_creds");
 202         }
 203
 204         krb5_get_init_creds_opt_free(context, opt);
 205
 206         ret = krb5_cc_initialize(context, id, admin_principal);
 207         krb5_free_principal(context, admin_principal);
 208         if (ret)
 209             krb5_err(context, 1, ret, "krb5_cc_initialize");
 210
 211         ret = krb5_cc_store_cred(context, id, &cred);
 212         if (ret)
 213             krb5_err(context, 1, ret, "krb5_cc_store_cred");
 214
 215         krb5_free_cred_contents (context, &cred);
 216     }
 217
 218     if (argc == 0) {
 219         exit_value = change_password(context, NULL, id);
 220     } else {
 221         exit_value = 0;
 222
 223         while (argc-- > 0) {
 224
 225             ret = krb5_parse_name (context, argv[0], &principal);
 226             if (ret)
 227                 krb5_err (context, 1, ret, "krb5_parse_name");
 228
 229             ret = change_password(context, principal, id);
 230             if (ret)
 231                 exit_value = 1;
 232             krb5_free_principal(context, principal);
 233             argv++;
 234         }
 235     }
 236
 237     if (cred_cache_str == NULL) {
 238         ret = krb5_cc_destroy(context, id);
 239         if (ret)
 240             krb5_err (context, 1, ret, "krb5_cc_destroy");
 241     } else {
 242         ret = krb5_cc_close(context, id);
 243         if (ret)
 244             krb5_err (context, 1, ret, "krb5_cc_close");
 245     }
 246
 247     krb5_free_context (context);
 248     return exit_value;
 249 }