kpasswd/kpasswd-generator.c

   1 /*
   2  * Copyright (c) 2000 - 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
  36 RCSID("$Id$");
  37
  38 static unsigned
  39 read_words (const char *filename, char ***ret_w)
  40 {
  41     unsigned n, alloc;
  42     FILE *f;
  43     char buf[256];
  44     char **w = NULL;
  45
  46     f = fopen (filename, "r");
  47     if (f == NULL)
  48         err (1, "cannot open %s", filename);
  49     alloc = n = 0;
  50     while (fgets (buf, sizeof(buf), f) != NULL) {
  51         buf[strcspn(buf, "\r\n")] = '\0';
  52         if (n >= alloc) {
  53             alloc += 16;
  54             w = erealloc (w, alloc * sizeof(char **));
  55         }
  56         w[n++] = estrdup (buf);
  57     }
  58     *ret_w = w;
  59     if (n == 0)
  60         errx(1, "%s is an empty file, no words to try", filename);
  61     fclose(f);
  62     return n;
  63 }
  64
  65 static int
  66 nop_prompter (krb5_context context,
  67               void *data,
  68               const char *name,
  69               const char *banner,
  70               int num_prompts,
  71               krb5_prompt prompts[])
  72 {
  73     return 0;
  74 }
  75
  76 static void
  77 generate_requests (const char *filename, unsigned nreq)
  78 {
  79     krb5_context context;
  80     krb5_error_code ret;
  81     int i;
  82     char **words;
  83     unsigned nwords;
  84
  85     ret = krb5_init_context (&context);
  86     if (ret)
  87         errx (1, "krb5_init_context failed: %d", ret);
  88
  89     nwords = read_words (filename, &words);
  90
  91     for (i = 0; i < nreq; ++i) {
  92         char *name = words[rand() % nwords];
  93         krb5_get_init_creds_opt *opt;
  94         krb5_creds cred;
  95         krb5_principal principal;
  96         int result_code;
  97         krb5_data result_code_string, result_string;
  98         char *old_pwd, *new_pwd;
  99
 100         krb5_get_init_creds_opt_alloc (context, &opt);
 101         krb5_get_init_creds_opt_set_tkt_life (opt, 300);
 102         krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
 103         krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
 104
 105         ret = krb5_parse_name (context, name, &principal);
 106         if (ret)
 107             krb5_err (context, 1, ret, "krb5_parse_name %s", name);
 108
 109         asprintf (&old_pwd, "%s", name);
 110         asprintf (&new_pwd, "%s2", name);
 111
 112         ret = krb5_get_init_creds_password (context,
 113                                             &cred,
 114                                             principal,
 115                                             old_pwd,
 116                                             nop_prompter,
 117                                             NULL,
 118                                             0,
 119                                             "kadmin/changepw",
 120                                             opt);
 121         if( ret == KRB5KRB_AP_ERR_BAD_INTEGRITY
 122             || ret == KRB5KRB_AP_ERR_MODIFIED) {
 123             char *tmp;
 124
 125             tmp = new_pwd;
 126             new_pwd = old_pwd;
 127             old_pwd = tmp;
 128
 129             ret = krb5_get_init_creds_password (context,
 130                                                 &cred,
 131                                                 principal,
 132                                                 old_pwd,
 133                                                 nop_prompter,
 134                                                 NULL,
 135                                                 0,
 136                                                 "kadmin/changepw",
 137                                                 opt);
 138         }
 139         if (ret)
 140             krb5_err (context, 1, ret, "krb5_get_init_creds_password");
 141
 142         krb5_free_principal (context, principal);
 143
 144
 145         ret = krb5_set_password (context,
 146                                  &cred,
 147                                  new_pwd,
 148                                  NULL,
 149                                  &result_code,
 150                                  &result_code_string,
 151                                  &result_string);
 152         if (ret)
 153             krb5_err (context, 1, ret, "krb5_change_password");
 154
 155         free (old_pwd);
 156         free (new_pwd);
 157         krb5_free_cred_contents (context, &cred);
 158         krb5_get_init_creds_opt_free(context, opt);
 159     }
 160 }
 161
 162 static int version_flag = 0;
 163 static int help_flag    = 0;
 164
 165 static struct getargs args[] = {
 166     { "version",        0,   arg_flag, &version_flag },
 167     { "help",           0,   arg_flag, &help_flag }
 168 };
 169
 170 static void
 171 usage (int ret)
 172 {
 173     arg_printusage (args,
 174                     sizeof(args)/sizeof(*args),
 175                     NULL,
 176                     "file [number]");
 177     exit (ret);
 178 }
 179
 180 int
 181 main(int argc, char **argv)
 182 {
 183     int optind = 0;
 184     int nreq;
 185     char *end;
 186
 187     setprogname(argv[0]);
 188     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optind))
 189         usage(1);
 190     if (help_flag)
 191         usage (0);
 192     if (version_flag) {
 193         print_version(NULL);
 194         return 0;
 195     }
 196     argc -= optind;
 197     argv += optind;
 198
 199     if (argc != 2)
 200         usage (1);
 201     srand (0);
 202     nreq = strtol (argv[1], &end, 0);
 203     if (argv[1] == end || *end != '\0')
 204         usage (1);
 205     generate_requests (argv[0], nreq);
 206     return 0;
 207 }