crypto/dist/heimdal/kuser/kimpersonate.c

   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 __RCSID("$Heimdal: kimpersonate.c 22117 2007-12-03 21:24:16Z lha $"
  36         "$NetBSD$");
  37 #include <parse_units.h>
  38
  39 static char *client_principal_str = NULL;
  40 static krb5_principal client_principal;
  41 static char *server_principal_str = NULL;
  42 static krb5_principal server_principal;
  43
  44 static char *ccache_str = NULL;
  45
  46 static char *ticket_flags_str = NULL;
  47 static TicketFlags ticket_flags;
  48 static char *keytab_file = NULL;
  49 static char *enc_type = "des-cbc-md5";
  50 static int   expiration_time = 3600;
  51 static struct getarg_strings client_addresses;
  52 static int   version_flag = 0;
  53 static int   help_flag = 0;
  54 static int   use_krb5 = 1;
  55
  56 /*
  57  *
  58  */
  59
  60 static void
  61 encode_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 = *krb5_princ_realm (context, cred->client);
  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     krb5_crypto_init(context, skey, etype, &crypto);
 109     krb5_encrypt_EncryptedData (context,
 110                                 crypto,
 111                                 KRB5_KU_TICKET,
 112                                 buf,
 113                                 len,
 114                                 skvno,
 115                                 &ticket.enc_part);
 116     free(buf);
 117     krb5_crypto_destroy(context, crypto);
 118
 119     /*
 120      * Encode ticket
 121      */
 122
 123     ticket.tkt_vno = 5;
 124     ticket.realm = *krb5_princ_realm (context, cred->server);
 125     copy_PrincipalName(&cred->server->name, &ticket.sname);
 126
 127     ASN1_MALLOC_ENCODE(Ticket, buf, len, &ticket, &size, ret);
 128     if(ret)
 129         krb5_err (context, 1, ret, "encode_Ticket");
 130
 131     krb5_data_copy(&cred->ticket, buf, len);
 132 }
 133
 134 /*
 135  *
 136  */
 137
 138 static int
 139 create_krb5_tickets (krb5_context context, krb5_keytab kt)
 140 {
 141     krb5_error_code ret;
 142     krb5_keytab_entry entry;
 143     krb5_creds cred;
 144     krb5_enctype etype;
 145     krb5_ccache ccache;
 146
 147     memset (&cred, 0, sizeof(cred));
 148
 149     ret = krb5_string_to_enctype (context, enc_type, &etype);
 150     if (ret)
 151         krb5_err (context, 1, ret, "krb5_string_to_enctype");
 152     ret = krb5_kt_get_entry (context, kt, server_principal,
 153                              0, etype, &entry);
 154     if (ret)
 155         krb5_err (context, 1, ret, "krb5_kt_get_entry");
 156
 157     /*
 158      * setup cred
 159      */
 160
 161
 162     ret = krb5_copy_principal (context, client_principal, &cred.client);
 163     if (ret)
 164         krb5_err (context, 1, ret, "krb5_copy_principal");
 165     ret = krb5_copy_principal (context, server_principal, &cred.server);
 166     if (ret)
 167         krb5_err (context, 1, ret, "krb5_copy_principal");
 168     krb5_generate_random_keyblock(context, etype, &cred.session);
 169
 170     cred.times.authtime = time(NULL);
 171     cred.times.starttime = time(NULL);
 172     cred.times.endtime = time(NULL) + expiration_time;
 173     cred.times.renew_till = 0;
 174     krb5_data_zero(&cred.second_ticket);
 175
 176     ret = krb5_get_all_client_addrs (context, &cred.addresses);
 177     if (ret)
 178         krb5_err (context, 1, ret, "krb5_get_all_client_addrs");
 179     cred.flags.b = ticket_flags;
 180
 181
 182     /*
 183      * Encode encrypted part of ticket
 184      */
 185
 186     encode_ticket (context, &entry.keyblock, etype, entry.vno, &cred);
 187
 188     /*
 189      * Write to cc
 190      */
 191
 192     if (ccache_str) {
 193         ret = krb5_cc_resolve(context, ccache_str, &ccache);
 194         if (ret)
 195             krb5_err (context, 1, ret, "krb5_cc_resolve");
 196     } else {
 197         ret = krb5_cc_default (context, &ccache);
 198         if (ret)
 199             krb5_err (context, 1, ret, "krb5_cc_default");
 200     }
 201
 202     ret = krb5_cc_initialize (context, ccache, cred.client);
 203     if (ret)
 204         krb5_err (context, 1, ret, "krb5_cc_initialize");
 205
 206     ret = krb5_cc_store_cred (context, ccache, &cred);
 207     if (ret)
 208         krb5_err (context, 1, ret, "krb5_cc_store_cred");
 209
 210     krb5_free_cred_contents (context, &cred);
 211     krb5_cc_close (context, ccache);
 212
 213     return 0;
 214 }
 215
 216 /*
 217  *
 218  */
 219
 220 static void
 221 setup_env (krb5_context context, krb5_keytab *kt)
 222 {
 223     krb5_error_code ret;
 224
 225     if (keytab_file)
 226         ret = krb5_kt_resolve (context, keytab_file, kt);
 227     else
 228         ret = krb5_kt_default (context, kt);
 229     if (ret)
 230         krb5_err (context, 1, ret, "resolving keytab");
 231
 232     if (client_principal_str == NULL)
 233         krb5_errx (context, 1, "missing client principal");
 234     ret = krb5_parse_name (context, client_principal_str, &client_principal);
 235     if (ret)
 236         krb5_err (context, 1, ret, "resolvning client name");
 237
 238     if (server_principal_str == NULL)
 239         krb5_errx (context, 1, "missing server principal");
 240     ret = krb5_parse_name (context, server_principal_str, &server_principal);
 241     if (ret)
 242         krb5_err (context, 1, ret, "resolvning client name");
 243
 244     if (ticket_flags_str) {
 245         int ticket_flags_int;
 246
 247         ticket_flags_int = parse_flags(ticket_flags_str,
 248                                        asn1_TicketFlags_units(), 0);
 249         if (ticket_flags_int <= 0) {
 250             krb5_warnx (context, "bad ticket flags: `%s'", ticket_flags_str);
 251             print_flags_table (asn1_TicketFlags_units(), stderr);
 252             exit (1);
 253         }
 254         if (ticket_flags_int)
 255             ticket_flags = int2TicketFlags (ticket_flags_int);
 256     }
 257 }
 258
 259 /*
 260  *
 261  */
 262
 263 struct getargs args[] = {
 264     { "ccache", 0, arg_string, &ccache_str,
 265       "name of kerberos 5 credential cache", "cache-name"},
 266     { "server", 's', arg_string, &server_principal_str,
 267       "name of server principal" },
 268     { "client", 'c', arg_string, &client_principal_str,
 269       "name of client principal" },
 270     { "keytab", 'k', arg_string, &keytab_file,
 271       "name of keytab file" },
 272     { "krb5", '5', arg_flag,     &use_krb5,
 273       "create a kerberos 5 ticket"},
 274     { "expire-time", 'e', arg_integer, &expiration_time,
 275       "lifetime of ticket in seconds" },
 276     { "client-addresses", 'a', arg_strings, &client_addresses,
 277       "addresses of client" },
 278     { "enc-type", 't', arg_string,      &enc_type,
 279       "encryption type" },
 280     { "ticket-flags", 'f', arg_string,   &ticket_flags_str,
 281       "ticket flags for krb5 ticket" },
 282     { "version", 0,  arg_flag,          &version_flag,  "Print version",
 283       NULL },
 284     { "help",    0,  arg_flag,          &help_flag,     NULL,
 285       NULL }
 286 };
 287
 288 static void
 289 usage (int ret)
 290 {
 291     arg_printusage (args,
 292                     sizeof(args) / sizeof(args[0]),
 293                     NULL,
 294                     "");
 295     exit (ret);
 296 }
 297
 298 int
 299 main (int argc, char **argv)
 300 {
 301     int optind = 0;
 302     krb5_error_code ret;
 303     krb5_context context;
 304     krb5_keytab kt;
 305
 306     setprogname (argv[0]);
 307
 308     ret = krb5_init_context (&context);
 309     if (ret)
 310         errx(1, "krb5_init_context failed: %u", ret);
 311
 312     if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
 313                 &optind))
 314         usage (1);
 315
 316     if (help_flag)
 317         usage (0);
 318
 319     if (version_flag) {
 320         print_version(NULL);
 321         return 0;
 322     }
 323
 324     setup_env (context, &kt);
 325
 326     if (use_krb5)
 327         create_krb5_tickets (context, kt);
 328
 329     krb5_kt_close (context, kt);
 330     return 0;
 331 }