source: heimdal/trunk/kuser/kimpersonate.c

Last change on this file was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 9.0 KB
Line 
1/*
2 * Copyright (c) 2000 - 2007 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 "kuser_locl.h"
35#include <parse_units.h>
36
37static char *client_principal_str = NULL;
38static krb5_principal client_principal;
39static char *server_principal_str = NULL;
40static krb5_principal server_principal;
41
42static char *ccache_str = NULL;
43
44static char *ticket_flags_str = NULL;
45static TicketFlags ticket_flags;
46static char *keytab_file = NULL;
47static char *enctype_string = NULL;
48static int expiration_time = 3600;
49static struct getarg_strings client_addresses;
50static int version_flag = 0;
51static int help_flag = 0;
52static int use_krb5 = 1;
53
54static const char *enc_type = "des-cbc-md5";
55
56/*
57 *
58 */
59
60static void
61encode_ticket (krb5_context context,
62 EncryptionKey *skey,
63 krb5_enctype etype,
64 int skvno,
65 krb5_creds *cred)
66{
67 size_t len, size;
68 char *buf;
69 krb5_error_code ret;
70 krb5_crypto crypto;
71 EncryptedData enc_part;
72 EncTicketPart et;
73 Ticket ticket;
74
75 memset (&enc_part, 0, sizeof(enc_part));
76 memset (&ticket, 0, sizeof(ticket));
77
78 /*
79 * Set up `enc_part'
80 */
81
82 et.flags = cred->flags.b;
83 et.key = cred->session;
84 et.crealm = cred->client->realm;
85 copy_PrincipalName(&cred->client->name, &et.cname);
86 {
87 krb5_data empty_string;
88
89 krb5_data_zero(&empty_string);
90 et.transited.tr_type = DOMAIN_X500_COMPRESS;
91 et.transited.contents = empty_string;
92 }
93 et.authtime = cred->times.authtime;
94 et.starttime = NULL;
95 et.endtime = cred->times.endtime;
96 et.renew_till = NULL;
97 et.caddr = &cred->addresses;
98 et.authorization_data = NULL; /* XXX allow random authorization_data */
99
100 /*
101 * Encrypt `enc_part' of ticket with service key
102 */
103
104 ASN1_MALLOC_ENCODE(EncTicketPart, buf, len, &et, &size, ret);
105 if (ret)
106 krb5_err(context, 1, ret, "EncTicketPart");
107
108 ret = krb5_crypto_init(context, skey, etype, &crypto);
109 if (ret)
110 krb5_err(context, 1, ret, "krb5_crypto_init");
111 ret = krb5_encrypt_EncryptedData (context,
112 crypto,
113 KRB5_KU_TICKET,
114 buf,
115 len,
116 skvno,
117 &ticket.enc_part);
118 if (ret)
119 krb5_err(context, 1, ret, "krb5_encrypt_EncryptedData");
120
121 free(buf);
122 krb5_crypto_destroy(context, crypto);
123
124 /*
125 * Encode ticket
126 */
127
128 ticket.tkt_vno = 5;
129 ticket.realm = cred->server->realm;
130 copy_PrincipalName(&cred->server->name, &ticket.sname);
131
132 ASN1_MALLOC_ENCODE(Ticket, buf, len, &ticket, &size, ret);
133 if(ret)
134 krb5_err (context, 1, ret, "encode_Ticket");
135
136 krb5_data_copy(&cred->ticket, buf, len);
137 free(buf);
138}
139
140/*
141 *
142 */
143
144static int
145create_krb5_tickets (krb5_context context, krb5_keytab kt)
146{
147 krb5_error_code ret;
148 krb5_keytab_entry entry;
149 krb5_creds cred;
150 krb5_enctype etype;
151 krb5_ccache ccache;
152
153 memset (&cred, 0, sizeof(cred));
154
155 ret = krb5_string_to_enctype (context, enc_type, &etype);
156 if (ret)
157 krb5_err (context, 1, ret, "krb5_string_to_enctype");
158 ret = krb5_kt_get_entry (context, kt, server_principal,
159 0, etype, &entry);
160 if (ret)
161 krb5_err (context, 1, ret, "krb5_kt_get_entry");
162
163 /*
164 * setup cred
165 */
166
167
168 ret = krb5_copy_principal (context, client_principal, &cred.client);
169 if (ret)
170 krb5_err (context, 1, ret, "krb5_copy_principal");
171 ret = krb5_copy_principal (context, server_principal, &cred.server);
172 if (ret)
173 krb5_err (context, 1, ret, "krb5_copy_principal");
174 krb5_generate_random_keyblock(context, etype, &cred.session);
175
176 cred.times.authtime = time(NULL);
177 cred.times.starttime = time(NULL);
178 cred.times.endtime = time(NULL) + expiration_time;
179 cred.times.renew_till = 0;
180 krb5_data_zero(&cred.second_ticket);
181
182 ret = krb5_get_all_client_addrs (context, &cred.addresses);
183 if (ret)
184 krb5_err (context, 1, ret, "krb5_get_all_client_addrs");
185 cred.flags.b = ticket_flags;
186
187
188 /*
189 * Encode encrypted part of ticket
190 */
191
192 encode_ticket (context, &entry.keyblock, etype, entry.vno, &cred);
193
194 /*
195 * Write to cc
196 */
197
198 if (ccache_str) {
199 ret = krb5_cc_resolve(context, ccache_str, &ccache);
200 if (ret)
201 krb5_err (context, 1, ret, "krb5_cc_resolve");
202 } else {
203 ret = krb5_cc_default (context, &ccache);
204 if (ret)
205 krb5_err (context, 1, ret, "krb5_cc_default");
206 }
207
208 ret = krb5_cc_initialize (context, ccache, cred.client);
209 if (ret)
210 krb5_err (context, 1, ret, "krb5_cc_initialize");
211
212 ret = krb5_cc_store_cred (context, ccache, &cred);
213 if (ret)
214 krb5_err (context, 1, ret, "krb5_cc_store_cred");
215
216 krb5_free_cred_contents (context, &cred);
217 krb5_cc_close (context, ccache);
218
219 return 0;
220}
221
222/*
223 *
224 */
225
226static void
227setup_env (krb5_context context, krb5_keytab *kt)
228{
229 krb5_error_code ret;
230
231 if (keytab_file)
232 ret = krb5_kt_resolve (context, keytab_file, kt);
233 else
234 ret = krb5_kt_default (context, kt);
235 if (ret)
236 krb5_err (context, 1, ret, "resolving keytab");
237
238 if (client_principal_str == NULL)
239 krb5_errx (context, 1, "missing client principal");
240 ret = krb5_parse_name (context, client_principal_str, &client_principal);
241 if (ret)
242 krb5_err (context, 1, ret, "resolvning client name");
243
244 if (server_principal_str == NULL)
245 krb5_errx (context, 1, "missing server principal");
246 ret = krb5_parse_name (context, server_principal_str, &server_principal);
247 if (ret)
248 krb5_err (context, 1, ret, "resolvning client name");
249
250 if (ticket_flags_str) {
251 int ticket_flags_int;
252
253 ticket_flags_int = parse_flags(ticket_flags_str,
254 asn1_TicketFlags_units(), 0);
255 if (ticket_flags_int <= 0) {
256 krb5_warnx (context, "bad ticket flags: `%s'", ticket_flags_str);
257 print_flags_table (asn1_TicketFlags_units(), stderr);
258 exit (1);
259 }
260 if (ticket_flags_int)
261 ticket_flags = int2TicketFlags (ticket_flags_int);
262 }
263}
264
265/*
266 *
267 */
268
269struct getargs args[] = {
270 { "ccache", 0, arg_string, &ccache_str,
271 "name of kerberos 5 credential cache", "cache-name"},
272 { "server", 's', arg_string, &server_principal_str,
273 "name of server principal", NULL },
274 { "client", 'c', arg_string, &client_principal_str,
275 "name of client principal", NULL },
276 { "keytab", 'k', arg_string, &keytab_file,
277 "name of keytab file", NULL },
278 { "krb5", '5', arg_flag, &use_krb5,
279 "create a kerberos 5 ticket", NULL },
280 { "expire-time", 'e', arg_integer, &expiration_time,
281 "lifetime of ticket in seconds", NULL },
282 { "client-addresses", 'a', arg_strings, &client_addresses,
283 "addresses of client", NULL },
284 { "enc-type", 't', arg_string, &enctype_string,
285 "encryption type", NULL },
286 { "ticket-flags", 'f', arg_string, &ticket_flags_str,
287 "ticket flags for krb5 ticket", NULL },
288 { "version", 0, arg_flag, &version_flag, "Print version",
289 NULL },
290 { "help", 0, arg_flag, &help_flag, NULL,
291 NULL }
292};
293
294static void
295usage (int ret)
296{
297 arg_printusage (args,
298 sizeof(args) / sizeof(args[0]),
299 NULL,
300 "");
301 exit (ret);
302}
303
304int
305main (int argc, char **argv)
306{
307 int optidx = 0;
308 krb5_error_code ret;
309 krb5_context context;
310 krb5_keytab kt;
311
312 setprogname (argv[0]);
313
314 ret = krb5_init_context (&context);
315 if (ret)
316 errx(1, "krb5_init_context failed: %u", ret);
317
318 if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
319 usage(1);
320
321 if (help_flag)
322 usage(0);
323
324 if (version_flag) {
325 print_version(NULL);
326 return 0;
327 }
328
329 if (enctype_string)
330 enc_type = enctype_string;
331
332 setup_env(context, &kt);
333
334 if (use_krb5)
335 create_krb5_tickets(context, kt);
336
337 krb5_kt_close(context, kt);
338
339 return 0;
340}
Note: See TracBrowser for help on using the repository browser.