/crypto/heimdal/kpasswd/kpasswd-generator.c

  1/*
  2 * Copyright (c) 2000 - 2004 Kungliga Tekniska Hรถgskolan
  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
 36RCSID("$Id$");
 37
 38static unsigned
 39read_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
 65static int
 66nop_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
 76static void
 77generate_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
162static int version_flag	= 0;
163static int help_flag	= 0;
164
165static struct getargs args[] = {
166    { "version", 	0,   arg_flag, &version_flag },
167    { "help",		0,   arg_flag, &help_flag }
168};
169
170static void
171usage (int ret)
172{
173    arg_printusage (args,
174		    sizeof(args)/sizeof(*args),
175		    NULL,
176		    "file [number]");
177    exit (ret);
178}
179
180int
181main(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}