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, k;
  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         int aret;
 100
 101         krb5_get_init_creds_opt_alloc(context, &opt);
 102         krb5_get_init_creds_opt_set_tkt_life (opt, 300);
 103         krb5_get_init_creds_opt_set_forwardable (opt, FALSE);
 104         krb5_get_init_creds_opt_set_proxiable (opt, FALSE);
 105
 106         ret = krb5_parse_name(context, name, &principal);
 107         if (ret)
 108             krb5_err(context, 1, ret, "krb5_parse_name %s", name);
 109
 110         aret = asprintf(&old_pwd, "%s", name);
 111         if (aret == -1)
 112             krb5_errx(context, 1, "out of memory");
 113         aret = asprintf(&new_pwd, "%s2", name);
 114         if (aret == -1)
 115             krb5_errx(context, 1, "out of memory");
 116
 117         ret = krb5_get_init_creds_password(context,
 118                                            &cred,
 119                                            principal,
 120                                            old_pwd,
 121                                            nop_prompter,
 122                                            NULL,
 123                                            0,
 124                                            "kadmin/changepw",
 125                                            opt);
 126         if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY
 127             || ret == KRB5KRB_AP_ERR_MODIFIED) {
 128             char *tmp;
 129
 130             tmp = new_pwd;
 131             new_pwd = old_pwd;
 132             old_pwd = tmp;
 133
 134             ret = krb5_get_init_creds_password(context,
 135                                                &cred,
 136                                                principal,
 137                                                old_pwd,
 138                                                nop_prompter,
 139                                                NULL,
 140                                                0,
 141                                                "kadmin/changepw",
 142                                                opt);
 143         }
 144         if (ret)
 145             krb5_err(context, 1, ret, "krb5_get_init_creds_password");
 146
 147         krb5_free_principal(context, principal);
 148
 149
 150         ret = krb5_set_password(context,
 151                                 &cred,
 152                                 new_pwd,
 153                                 NULL,
 154                                 &result_code,
 155                                 &result_code_string,
 156                                 &result_string);
 157         if (ret)
 158             krb5_err(context, 1, ret, "krb5_change_password");
 159
 160         free(old_pwd);
 161         free(new_pwd);
 162         krb5_free_cred_contents(context, &cred);
 163         krb5_get_init_creds_opt_free(context, opt);
 164     }
 165
 166     for (k = 0; k < nwords; k++)
 167         free(words[k]);
 168     free(words);
 169 }
 170
 171 static int version_flag = 0;
 172 static int help_flag    = 0;
 173
 174 static struct getargs args[] = {
 175     { "version",        0,   arg_flag, &version_flag, NULL, NULL },
 176     { "help",           0,   arg_flag, &help_flag,    NULL, NULL }
 177 };
 178
 179 static void
 180 usage(int ret)
 181 {
 182     arg_printusage(args,
 183                    sizeof(args)/sizeof(*args),
 184                    NULL,
 185                    "file [number]");
 186     exit (ret);
 187 }
 188
 189 int
 190 main(int argc, char **argv)
 191 {
 192     int optidx = 0;
 193     int nreq;
 194     char *end;
 195
 196     setprogname(argv[0]);
 197     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 198         usage(1);
 199     if (help_flag)
 200         usage (0);
 201     if (version_flag) {
 202         print_version(NULL);
 203         return 0;
 204     }
 205     argc -= optidx;
 206     argv += optidx;
 207
 208     if (argc != 2)
 209         usage (1);
 210     srand (0);
 211     nreq = strtol(argv[1], &end, 0);
 212     if (argv[1] == end || *end != '\0')
 213         usage (1);
 214     generate_requests(argv[0], nreq);
 215     return 0;
 216 }