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     return n;
  62 }
  63
  64 static int
  65 nop_prompter (krb5_context context,
  66               void *data,
  67               const char *name,
  68               const char *banner,
  69               int num_prompts,
  70               krb5_prompt prompts[])
  71 {
  72     return 0;
  73 }
  74
  75 static void
  76 generate_requests (const char *filename, unsigned nreq)
  77 {
  78     krb5_context context;
  79     krb5_error_code ret;
  80     int i;
  81     char **words;
  82     unsigned nwords;
  83
  84     ret = krb5_init_context (&context);
  85     if (ret)
  86         errx (1, "krb5_init_context failed: %d", ret);
  87
  88     nwords = read_words (filename, &words);
  89
  90     for (i = 0; i < nreq; ++i) {
  91         char *name = words[rand() % nwords];
  92         krb5_get_init_creds_opt *opt;
  93         krb5_creds cred;
  94         krb5_principal principal;
  95         int result_code;
  96         krb5_data result_code_string, result_string;
  97         char *old_pwd, *new_pwd;
  98
  99         krb5_get_init_creds_opt_alloc (context, &opt);
 100         krb5_get_init_creds_opt_set_tkt_life (opt, 300);
 101         krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
 102         krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
 103
 104         ret = krb5_parse_name (context, name, &principal);
 105         if (ret)
 106             krb5_err (context, 1, ret, "krb5_parse_name %s", name);
 107
 108         asprintf (&old_pwd, "%s", name);
 109         asprintf (&new_pwd, "%s2", name);
 110
 111         ret = krb5_get_init_creds_password (context,
 112                                             &cred,
 113                                             principal,
 114                                             old_pwd,
 115                                             nop_prompter,
 116                                             NULL,
 117                                             0,
 118                                             "kadmin/changepw",
 119                                             opt);
 120         if( ret == KRB5KRB_AP_ERR_BAD_INTEGRITY
 121             || ret == KRB5KRB_AP_ERR_MODIFIED) {
 122             char *tmp;
 123
 124             tmp = new_pwd;
 125             new_pwd = old_pwd;
 126             old_pwd = tmp;
 127
 128             ret = krb5_get_init_creds_password (context,
 129                                                 &cred,
 130                                                 principal,
 131                                                 old_pwd,
 132                                                 nop_prompter,
 133                                                 NULL,
 134                                                 0,
 135                                                 "kadmin/changepw",
 136                                                 opt);
 137         }
 138         if (ret)
 139             krb5_err (context, 1, ret, "krb5_get_init_creds_password");
 140
 141         krb5_free_principal (context, principal);
 142
 143         ret = krb5_change_password (context, &cred, new_pwd,
 144                                     &result_code,
 145                                     &result_code_string,
 146                                     &result_string);
 147         if (ret)
 148             krb5_err (context, 1, ret, "krb5_change_password");
 149
 150         free (old_pwd);
 151         free (new_pwd);
 152         krb5_free_cred_contents (context, &cred);
 153         krb5_get_init_creds_opt_free(context, opt);
 154     }
 155 }
 156
 157 static int version_flag = 0;
 158 static int help_flag    = 0;
 159
 160 static struct getargs args[] = {
 161     { "version",        0,   arg_flag, &version_flag },
 162     { "help",           0,   arg_flag, &help_flag }
 163 };
 164
 165 static void
 166 usage (int ret)
 167 {
 168     arg_printusage (args,
 169                     sizeof(args)/sizeof(*args),
 170                     NULL,
 171                     "file [number]");
 172     exit (ret);
 173 }
 174
 175 int
 176 main(int argc, char **argv)
 177 {
 178     int optind = 0;
 179     int nreq;
 180     char *end;
 181
 182     setprogname(argv[0]);
 183     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optind))
 184         usage(1);
 185     if (help_flag)
 186         usage (0);
 187     if (version_flag) {
 188         print_version(NULL);
 189         return 0;
 190     }
 191     argc -= optind;
 192     argv += optind;
 193
 194     if (argc != 2)
 195         usage (1);
 196     srand (0);
 197     nreq = strtol (argv[1], &end, 0);
 198     if (argv[1] == end || *end != '\0')
 199         usage (1);
 200     generate_requests (argv[0], nreq);
 201     return 0;
 202 }