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, 1);
  87     free(msg);
  88     if (name)
  89         free(name);
  90     if (ret != 0) {
  91         return 1;
  92     }
  93
  94     ret = krb5_set_password_using_ccache (context, id, pwbuf,
  95                                           principal,
  96                                           &result_code,
  97                                           &result_code_string,
  98                                           &result_string);
  99     if (ret) {
 100         krb5_warn (context, ret, "krb5_set_password_using_ccache");
 101         return 1;
 102     }
 103
 104     printf ("%s%s%.*s\n", krb5_passwd_result_to_string(context, result_code),
 105             result_string.length > 0 ? " : " : "",
 106             (int)result_string.length,
 107             result_string.length > 0 ? (char *)result_string.data : "");
 108
 109     krb5_data_free (&result_code_string);
 110     krb5_data_free (&result_string);
 111
 112     return ret != 0;
 113 }
 114
 115
 116 int
 117 main (int argc, char **argv)
 118 {
 119     krb5_error_code ret;
 120     krb5_context context;
 121     krb5_principal principal;
 122     krb5_get_init_creds_opt *opt;
 123     krb5_ccache id = NULL;
 124     int exit_value;
 125     int optidx = 0;
 126
 127     setprogname(argv[0]);
 128
 129     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 130         usage(1, args, sizeof(args) / sizeof(args[0]));
 131     if (help_flag)
 132         usage(0, args, sizeof(args) / sizeof(args[0]));
 133     if (version_flag) {
 134         print_version(NULL);
 135         return 0;
 136     }
 137     argc -= optidx;
 138     argv += optidx;
 139
 140     ret = krb5_init_context (&context);
 141     if (ret)
 142         errx (1, "krb5_init_context failed: %d", ret);
 143
 144     ret = krb5_get_init_creds_opt_alloc (context, &opt);
 145     if (ret)
 146         krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
 147
 148     krb5_get_init_creds_opt_set_tkt_life (opt, 300);
 149     krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
 150     krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
 151
 152     if (cred_cache_str) {
 153         ret = krb5_cc_resolve(context, cred_cache_str, &id);
 154         if (ret)
 155             krb5_err (context, 1, ret, "krb5_cc_resolve");
 156     } else {
 157         ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, &id);
 158         if (ret)
 159             krb5_err (context, 1, ret, "krb5_cc_new_unique");
 160     }
 161
 162     if (cred_cache_str == NULL) {
 163         krb5_principal admin_principal = NULL;
 164         krb5_creds cred;
 165
 166         if (admin_principal_str) {
 167             ret = krb5_parse_name (context, admin_principal_str,
 168                                    &admin_principal);
 169             if (ret)
 170                 krb5_err (context, 1, ret, "krb5_parse_name");
 171         } else if (argc == 1) {
 172             ret = krb5_parse_name (context, argv[0], &admin_principal);
 173             if (ret)
 174                 krb5_err (context, 1, ret, "krb5_parse_name");
 175         } else {
 176             ret = krb5_get_default_principal (context, &admin_principal);
 177             if (ret)
 178                 krb5_err (context, 1, ret, "krb5_get_default_principal");
 179         }
 180
 181         ret = krb5_get_init_creds_password (context,
 182                                             &cred,
 183                                             admin_principal,
 184                                             NULL,
 185                                             krb5_prompter_posix,
 186                                             NULL,
 187                                             0,
 188                                             "kadmin/changepw",
 189                                             opt);
 190         switch (ret) {
 191         case 0:
 192             break;
 193         case KRB5_LIBOS_PWDINTR :
 194             return 1;
 195         case KRB5KRB_AP_ERR_BAD_INTEGRITY :
 196         case KRB5KRB_AP_ERR_MODIFIED :
 197             krb5_errx(context, 1, "Password incorrect");
 198             break;
 199         default:
 200             krb5_err(context, 1, ret, "krb5_get_init_creds");
 201         }
 202
 203         krb5_get_init_creds_opt_free(context, opt);
 204
 205         ret = krb5_cc_initialize(context, id, admin_principal);
 206         krb5_free_principal(context, admin_principal);
 207         if (ret)
 208             krb5_err(context, 1, ret, "krb5_cc_initialize");
 209
 210         ret = krb5_cc_store_cred(context, id, &cred);
 211         if (ret)
 212             krb5_err(context, 1, ret, "krb5_cc_store_cred");
 213
 214         krb5_free_cred_contents (context, &cred);
 215     }
 216
 217     if (argc == 0) {
 218         exit_value = change_password(context, NULL, id);
 219     } else {
 220         exit_value = 0;
 221
 222         while (argc-- > 0) {
 223
 224             ret = krb5_parse_name (context, argv[0], &principal);
 225             if (ret)
 226                 krb5_err (context, 1, ret, "krb5_parse_name");
 227
 228             ret = change_password(context, principal, id);
 229             if (ret)
 230                 exit_value = 1;
 231             krb5_free_principal(context, principal);
 232             argv++;
 233         }
 234     }
 235
 236     if (cred_cache_str == NULL) {
 237         ret = krb5_cc_destroy(context, id);
 238         if (ret)
 239             krb5_err (context, 1, ret, "krb5_cc_destroy");
 240     } else {
 241         ret = krb5_cc_close(context, id);
 242         if (ret)
 243             krb5_err (context, 1, ret, "krb5_cc_close");
 244     }
 245
 246     krb5_free_context (context);
 247     return exit_value;
 248 }