331 lines
8.8 KiB
C
331 lines
8.8 KiB
C
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/*
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* Copyright (c) 2000 - 2007 Kungliga Tekniska H<EFBFBD>gskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kuser_locl.h"
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RCSID("$Id: kimpersonate.c 22117 2007-12-03 21:24:16Z lha $");
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#include <parse_units.h>
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static char *client_principal_str = NULL;
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static krb5_principal client_principal;
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static char *server_principal_str = NULL;
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static krb5_principal server_principal;
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static char *ccache_str = NULL;
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static char *ticket_flags_str = NULL;
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static TicketFlags ticket_flags;
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static char *keytab_file = NULL;
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static char *enc_type = "des-cbc-md5";
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static int expiration_time = 3600;
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static struct getarg_strings client_addresses;
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static int version_flag = 0;
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static int help_flag = 0;
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static int use_krb5 = 1;
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/*
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*
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*/
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static void
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encode_ticket (krb5_context context,
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EncryptionKey *skey,
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krb5_enctype etype,
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int skvno,
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krb5_creds *cred)
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{
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size_t len, size;
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char *buf;
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krb5_error_code ret;
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krb5_crypto crypto;
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EncryptedData enc_part;
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EncTicketPart et;
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Ticket ticket;
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memset (&enc_part, 0, sizeof(enc_part));
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memset (&ticket, 0, sizeof(ticket));
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/*
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* Set up `enc_part'
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*/
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et.flags = cred->flags.b;
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et.key = cred->session;
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et.crealm = *krb5_princ_realm (context, cred->client);
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copy_PrincipalName(&cred->client->name, &et.cname);
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{
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krb5_data empty_string;
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krb5_data_zero(&empty_string);
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et.transited.tr_type = DOMAIN_X500_COMPRESS;
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et.transited.contents = empty_string;
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}
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et.authtime = cred->times.authtime;
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et.starttime = NULL;
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et.endtime = cred->times.endtime;
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et.renew_till = NULL;
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et.caddr = &cred->addresses;
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et.authorization_data = NULL; /* XXX allow random authorization_data */
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/*
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* Encrypt `enc_part' of ticket with service key
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*/
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ASN1_MALLOC_ENCODE(EncTicketPart, buf, len, &et, &size, ret);
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if (ret)
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krb5_err(context, 1, ret, "EncTicketPart");
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krb5_crypto_init(context, skey, etype, &crypto);
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krb5_encrypt_EncryptedData (context,
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crypto,
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KRB5_KU_TICKET,
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buf,
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len,
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skvno,
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&ticket.enc_part);
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free(buf);
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krb5_crypto_destroy(context, crypto);
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/*
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* Encode ticket
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*/
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ticket.tkt_vno = 5;
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ticket.realm = *krb5_princ_realm (context, cred->server);
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copy_PrincipalName(&cred->server->name, &ticket.sname);
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ASN1_MALLOC_ENCODE(Ticket, buf, len, &ticket, &size, ret);
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if(ret)
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krb5_err (context, 1, ret, "encode_Ticket");
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krb5_data_copy(&cred->ticket, buf, len);
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}
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/*
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*
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*/
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static int
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create_krb5_tickets (krb5_context context, krb5_keytab kt)
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{
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krb5_error_code ret;
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krb5_keytab_entry entry;
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krb5_creds cred;
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krb5_enctype etype;
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krb5_ccache ccache;
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memset (&cred, 0, sizeof(cred));
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ret = krb5_string_to_enctype (context, enc_type, &etype);
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if (ret)
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krb5_err (context, 1, ret, "krb5_string_to_enctype");
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ret = krb5_kt_get_entry (context, kt, server_principal,
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0, etype, &entry);
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if (ret)
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krb5_err (context, 1, ret, "krb5_kt_get_entry");
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/*
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* setup cred
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*/
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ret = krb5_copy_principal (context, client_principal, &cred.client);
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if (ret)
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krb5_err (context, 1, ret, "krb5_copy_principal");
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ret = krb5_copy_principal (context, server_principal, &cred.server);
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if (ret)
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krb5_err (context, 1, ret, "krb5_copy_principal");
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krb5_generate_random_keyblock(context, etype, &cred.session);
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cred.times.authtime = time(NULL);
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cred.times.starttime = time(NULL);
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cred.times.endtime = time(NULL) + expiration_time;
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cred.times.renew_till = 0;
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krb5_data_zero(&cred.second_ticket);
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ret = krb5_get_all_client_addrs (context, &cred.addresses);
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if (ret)
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krb5_err (context, 1, ret, "krb5_get_all_client_addrs");
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cred.flags.b = ticket_flags;
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/*
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* Encode encrypted part of ticket
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*/
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encode_ticket (context, &entry.keyblock, etype, entry.vno, &cred);
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/*
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* Write to cc
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*/
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if (ccache_str) {
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ret = krb5_cc_resolve(context, ccache_str, &ccache);
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if (ret)
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krb5_err (context, 1, ret, "krb5_cc_resolve");
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} else {
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ret = krb5_cc_default (context, &ccache);
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if (ret)
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krb5_err (context, 1, ret, "krb5_cc_default");
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}
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ret = krb5_cc_initialize (context, ccache, cred.client);
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if (ret)
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krb5_err (context, 1, ret, "krb5_cc_initialize");
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ret = krb5_cc_store_cred (context, ccache, &cred);
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if (ret)
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krb5_err (context, 1, ret, "krb5_cc_store_cred");
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krb5_free_cred_contents (context, &cred);
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krb5_cc_close (context, ccache);
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return 0;
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}
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/*
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*
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*/
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static void
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setup_env (krb5_context context, krb5_keytab *kt)
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{
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krb5_error_code ret;
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if (keytab_file)
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ret = krb5_kt_resolve (context, keytab_file, kt);
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else
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ret = krb5_kt_default (context, kt);
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if (ret)
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krb5_err (context, 1, ret, "resolving keytab");
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if (client_principal_str == NULL)
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krb5_errx (context, 1, "missing client principal");
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ret = krb5_parse_name (context, client_principal_str, &client_principal);
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if (ret)
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krb5_err (context, 1, ret, "resolvning client name");
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if (server_principal_str == NULL)
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krb5_errx (context, 1, "missing server principal");
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ret = krb5_parse_name (context, server_principal_str, &server_principal);
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if (ret)
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krb5_err (context, 1, ret, "resolvning client name");
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if (ticket_flags_str) {
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int ticket_flags_int;
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ticket_flags_int = parse_flags(ticket_flags_str,
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asn1_TicketFlags_units(), 0);
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if (ticket_flags_int <= 0) {
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krb5_warnx (context, "bad ticket flags: `%s'", ticket_flags_str);
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print_flags_table (asn1_TicketFlags_units(), stderr);
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exit (1);
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}
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if (ticket_flags_int)
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ticket_flags = int2TicketFlags (ticket_flags_int);
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}
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}
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/*
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*
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*/
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struct getargs args[] = {
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{ "ccache", 0, arg_string, &ccache_str,
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"name of kerberos 5 credential cache", "cache-name"},
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{ "server", 's', arg_string, &server_principal_str,
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"name of server principal" },
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{ "client", 'c', arg_string, &client_principal_str,
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"name of client principal" },
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{ "keytab", 'k', arg_string, &keytab_file,
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"name of keytab file" },
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{ "krb5", '5', arg_flag, &use_krb5,
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"create a kerberos 5 ticket"},
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{ "expire-time", 'e', arg_integer, &expiration_time,
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"lifetime of ticket in seconds" },
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{ "client-addresses", 'a', arg_strings, &client_addresses,
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"addresses of client" },
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{ "enc-type", 't', arg_string, &enc_type,
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"encryption type" },
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{ "ticket-flags", 'f', arg_string, &ticket_flags_str,
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"ticket flags for krb5 ticket" },
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{ "version", 0, arg_flag, &version_flag, "Print version",
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NULL },
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{ "help", 0, arg_flag, &help_flag, NULL,
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NULL }
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};
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static void
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usage (int ret)
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{
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arg_printusage (args,
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sizeof(args) / sizeof(args[0]),
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NULL,
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"");
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exit (ret);
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}
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int
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main (int argc, char **argv)
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{
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int optind = 0;
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krb5_error_code ret;
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krb5_context context;
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krb5_keytab kt;
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setprogname (argv[0]);
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ret = krb5_init_context (&context);
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if (ret)
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errx(1, "krb5_init_context failed: %u", ret);
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if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
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&optind))
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usage (1);
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if (help_flag)
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usage (0);
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if (version_flag) {
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print_version(NULL);
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return 0;
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}
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setup_env (context, &kt);
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if (use_krb5)
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create_krb5_tickets (context, kt);
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krb5_kt_close (context, kt);
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return 0;
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}
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