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 },
  44     { "cache",                  'c', arg_string, &cred_cache_str },
  45     { "version",                0,   arg_flag, &version_flag },
  46     { "help",                   0,   arg_flag, &help_flag }
  47 };
  48
  49 static void
  50 usage (int ret, struct getargs *a, int num_args)
  51 {
  52     arg_printusage (a, num_args, NULL, "[principal ...]");
  53     exit (ret);
  54 }
  55
  56 static int
  57 change_password(krb5_context context,
  58                 krb5_principal principal,
  59                 krb5_ccache id)
  60 {
  61     krb5_data result_code_string, result_string;
  62     int result_code;
  63     krb5_error_code ret;
  64     char pwbuf[BUFSIZ];
  65     char *msg, *name;
  66
  67     krb5_data_zero (&result_code_string);
  68     krb5_data_zero (&result_string);
  69
  70     name = msg = NULL;
  71     if (principal == NULL)
  72         asprintf(&msg, "New password: ");
  73     else {
  74         ret = krb5_unparse_name(context, principal, &name);
  75         if (ret)
  76             krb5_err(context, 1, ret, "krb5_unparse_name");
  77
  78         asprintf(&msg, "New password for %s: ", name);
  79     }
  80
  81     if (msg == NULL)
  82         krb5_errx (context, 1, "out of memory");
  83
  84     ret = UI_UTIL_read_pw_string (pwbuf, sizeof(pwbuf), msg, 1);
  85     free(msg);
  86     if (name)
  87         free(name);
  88     if (ret != 0) {
  89         return 1;
  90     }
  91
  92     ret = krb5_set_password_using_ccache (context, id, pwbuf,
  93                                           principal,
  94                                           &result_code,
  95                                           &result_code_string,
  96                                           &result_string);
  97     if (ret) {
  98         krb5_warn (context, ret, "krb5_set_password_using_ccache");
  99         return 1;
 100     }
 101
 102     printf ("%s%s%.*s\n", krb5_passwd_result_to_string(context, result_code),
 103             result_string.length > 0 ? " : " : "",
 104             (int)result_string.length,
 105             result_string.length > 0 ? (char *)result_string.data : "");
 106
 107     krb5_data_free (&result_code_string);
 108     krb5_data_free (&result_string);
 109
 110     return ret != 0;
 111 }
 112
 113
 114 int
 115 main (int argc, char **argv)
 116 {
 117     krb5_error_code ret;
 118     krb5_context context;
 119     krb5_principal principal;
 120     krb5_get_init_creds_opt *opt;
 121     krb5_ccache id = NULL;
 122     int exit_value;
 123     int optidx = 0;
 124
 125     setprogname(argv[0]);
 126
 127     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 128         usage(1, args, sizeof(args) / sizeof(args[0]));
 129     if (help_flag)
 130         usage(0, args, sizeof(args) / sizeof(args[0]));
 131     if (version_flag) {
 132         print_version(NULL);
 133         return 0;
 134     }
 135     argc -= optidx;
 136     argv += optidx;
 137
 138     ret = krb5_init_context (&context);
 139     if (ret)
 140         errx (1, "krb5_init_context failed: %d", ret);
 141
 142     ret = krb5_get_init_creds_opt_alloc (context, &opt);
 143     if (ret)
 144         krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
 145
 146     krb5_get_init_creds_opt_set_tkt_life (opt, 300);
 147     krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
 148     krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
 149
 150     if (cred_cache_str) {
 151         ret = krb5_cc_resolve(context, cred_cache_str, &id);
 152         if (ret)
 153             krb5_err (context, 1, ret, "krb5_cc_resolve");
 154     } else {
 155         ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, &id);
 156         if (ret)
 157             krb5_err (context, 1, ret, "krb5_cc_new_unique");
 158     }
 159
 160     if (cred_cache_str == NULL) {
 161         krb5_principal admin_principal = NULL;
 162         krb5_creds cred;
 163
 164         if (admin_principal_str) {
 165             ret = krb5_parse_name (context, admin_principal_str,
 166                                    &admin_principal);
 167             if (ret)
 168                 krb5_err (context, 1, ret, "krb5_parse_name");
 169         } else if (argc == 1) {
 170             ret = krb5_parse_name (context, argv[0], &admin_principal);
 171             if (ret)
 172                 krb5_err (context, 1, ret, "krb5_parse_name");
 173         } else {
 174             ret = krb5_get_default_principal (context, &admin_principal);
 175             if (ret)
 176                 krb5_err (context, 1, ret, "krb5_get_default_principal");
 177         }
 178
 179         ret = krb5_get_init_creds_password (context,
 180                                             &cred,
 181                                             admin_principal,
 182                                             NULL,
 183                                             krb5_prompter_posix,
 184                                             NULL,
 185                                             0,
 186                                             "kadmin/changepw",
 187                                             opt);
 188         switch (ret) {
 189         case 0:
 190             break;
 191         case KRB5_LIBOS_PWDINTR :
 192             return 1;
 193         case KRB5KRB_AP_ERR_BAD_INTEGRITY :
 194         case KRB5KRB_AP_ERR_MODIFIED :
 195             krb5_errx(context, 1, "Password incorrect");
 196             break;
 197         default:
 198             krb5_err(context, 1, ret, "krb5_get_init_creds");
 199         }
 200
 201         krb5_get_init_creds_opt_free(context, opt);
 202
 203         ret = krb5_cc_initialize(context, id, admin_principal);
 204         krb5_free_principal(context, admin_principal);
 205         if (ret)
 206             krb5_err(context, 1, ret, "krb5_cc_initialize");
 207
 208         ret = krb5_cc_store_cred(context, id, &cred);
 209         if (ret)
 210             krb5_err(context, 1, ret, "krb5_cc_store_cred");
 211
 212         krb5_free_cred_contents (context, &cred);
 213     }
 214
 215     if (argc == 0) {
 216         exit_value = change_password(context, NULL, id);
 217     } else {
 218         exit_value = 0;
 219
 220         while (argc-- > 0) {
 221
 222             ret = krb5_parse_name (context, argv[0], &principal);
 223             if (ret)
 224                 krb5_err (context, 1, ret, "krb5_parse_name");
 225
 226             ret = change_password(context, principal, id);
 227             if (ret)
 228                 exit_value = 1;
 229             krb5_free_principal(context, principal);
 230             argv++;
 231         }
 232     }
 233
 234     if (cred_cache_str == NULL) {
 235         ret = krb5_cc_destroy(context, id);
 236         if (ret)
 237             krb5_err (context, 1, ret, "krb5_cc_destroy");
 238     } else {
 239         ret = krb5_cc_close(context, id);
 240         if (ret)
 241             krb5_err (context, 1, ret, "krb5_cc_close");
 242     }
 243
 244     krb5_free_context (context);
 245     return exit_value;
 246 }