summaryrefslogtreecommitdiffstats
path: root/third_party/heimdal/kuser/kimpersonate.c
diff options
context:
space:
mode:
Diffstat (limited to 'third_party/heimdal/kuser/kimpersonate.c')
-rw-r--r--third_party/heimdal/kuser/kimpersonate.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/third_party/heimdal/kuser/kimpersonate.c b/third_party/heimdal/kuser/kimpersonate.c
new file mode 100644
index 0000000..35b4295
--- /dev/null
+++ b/third_party/heimdal/kuser/kimpersonate.c
@@ -0,0 +1,395 @@
+/*
+ * Copyright (c) 2000 - 2007 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "kuser_locl.h"
+#include <parse_units.h>
+
+static char *client_principal_str = NULL;
+static krb5_principal client_principal;
+static char *server_principal_str = NULL;
+static krb5_principal server_principal;
+
+static char *ccache_str = NULL;
+
+static char *ticket_flags_str = NULL;
+static TicketFlags ticket_flags;
+static char *keytab_file = NULL;
+static char *enctype_string = NULL;
+static char *session_enctype_string = NULL;
+static int expiration_time = 3600;
+static struct getarg_strings client_addresses;
+static int version_flag = 0;
+static int help_flag = 0;
+static int use_krb5 = 1;
+static int add_to_ccache = 0;
+static int use_referral_realm = 0;
+
+static const char *enc_type = "aes256-cts-hmac-sha1-96";
+static const char *session_enc_type = NULL;
+
+static void
+encode_ticket(krb5_context context,
+ EncryptionKey *skey,
+ krb5_enctype etype,
+ int skvno,
+ krb5_creds *cred)
+{
+ size_t len, size;
+ char *buf;
+ krb5_error_code ret;
+ krb5_crypto crypto;
+ EncryptedData enc_part;
+ EncTicketPart et;
+ Ticket ticket;
+
+ memset(&enc_part, 0, sizeof(enc_part));
+ memset(&ticket, 0, sizeof(ticket));
+
+ /*
+ * Set up `enc_part'
+ */
+
+ et.flags = cred->flags.b;
+ et.key = cred->session;
+ et.crealm = cred->client->realm;
+ et.cname = cred->client->name;
+ {
+ krb5_data empty_string;
+
+ krb5_data_zero(&empty_string);
+ et.transited.tr_type = domain_X500_Compress;
+ et.transited.contents = empty_string;
+ }
+ et.authtime = cred->times.authtime;
+ et.starttime = NULL;
+ et.endtime = cred->times.endtime;
+ et.renew_till = NULL;
+ et.caddr = &cred->addresses;
+ et.authorization_data = NULL; /* XXX allow random authorization_data */
+
+ /*
+ * Encrypt `enc_part' of ticket with service key
+ */
+
+ ASN1_MALLOC_ENCODE(EncTicketPart, buf, len, &et, &size, ret);
+ if (ret)
+ krb5_err(context, 1, ret, "EncTicketPart");
+
+ ret = krb5_crypto_init(context, skey, etype, &crypto);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_crypto_init");
+ ret = krb5_encrypt_EncryptedData(context,
+ crypto,
+ KRB5_KU_TICKET,
+ buf,
+ len,
+ skvno,
+ &ticket.enc_part);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_encrypt_EncryptedData");
+
+ free(buf);
+ krb5_crypto_destroy(context, crypto);
+
+ /*
+ * Encode ticket
+ */
+
+ ticket.tkt_vno = 5;
+ ticket.realm = cred->server->realm;
+ ticket.sname = cred->server->name;
+ ASN1_MALLOC_ENCODE(Ticket, cred->ticket.data, cred->ticket.length, &ticket, &size, ret);
+ free_EncryptedData(&ticket.enc_part);
+ if(ret)
+ krb5_err(context, 1, ret, "encode_Ticket");
+}
+
+/*
+ *
+ */
+
+static int
+create_krb5_tickets(krb5_context context, krb5_keytab kt)
+{
+ krb5_error_code ret;
+ krb5_keytab_entry entry;
+ krb5_creds cred;
+ krb5_enctype etype;
+ krb5_enctype session_etype;
+ krb5_ccache ccache;
+
+ memset(&cred, 0, sizeof(cred));
+
+ ret = krb5_string_to_enctype(context, enc_type, &etype);
+ if (ret)
+ krb5_err (context, 1, ret, "krb5_string_to_enctype (enc-type)");
+ ret = krb5_string_to_enctype(context, session_enc_type, &session_etype);
+ if (ret)
+ krb5_err (context, 1, ret, "krb5_string_to_enctype (session-enc-type)");
+ ret = krb5_kt_get_entry(context, kt, server_principal, 0, etype, &entry);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_kt_get_entry (perhaps use different --enc-type)");
+
+ /*
+ * setup cred
+ */
+
+
+ ret = krb5_copy_principal(context, client_principal, &cred.client);
+ if (ret == 0)
+ ret = krb5_copy_principal(context, server_principal, &cred.server);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_copy_principal");
+ ret = krb5_generate_random_keyblock(context, session_etype, &cred.session);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_generate_random_keyblock");
+
+ cred.times.authtime = time(NULL);
+ cred.times.starttime = time(NULL);
+ cred.times.endtime = time(NULL) + expiration_time;
+ cred.times.renew_till = 0;
+ krb5_data_zero(&cred.second_ticket);
+
+ ret = krb5_get_all_client_addrs(context, &cred.addresses);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_get_all_client_addrs");
+ cred.flags.b = ticket_flags;
+
+
+ /*
+ * Encode encrypted part of ticket
+ */
+
+ encode_ticket(context, &entry.keyblock, etype, entry.vno, &cred);
+ krb5_kt_free_entry(context, &entry);
+
+ /*
+ * Write to cc
+ */
+
+ if (ccache_str) {
+ ret = krb5_cc_resolve(context, ccache_str, &ccache);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_cc_resolve");
+ } else {
+ ret = krb5_cc_default(context, &ccache);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_cc_default");
+ }
+
+ if (add_to_ccache) {
+ krb5_principal def_princ = NULL;
+
+ /*
+ * Force fcache to read the ccache header, otherwise the store
+ * will fail.
+ */
+ ret = krb5_cc_get_principal(context, ccache, &def_princ);
+ if (ret) {
+ krb5_warn(context, ret,
+ "Given ccache appears not to exist; initializing it");
+ ret = krb5_cc_initialize(context, ccache, cred.client);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_cc_initialize");
+ }
+ krb5_free_principal(context, def_princ);
+ } else {
+ ret = krb5_cc_initialize(context, ccache, cred.client);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_cc_initialize");
+ }
+
+ if (use_referral_realm &&
+ strcmp(krb5_principal_get_realm(context, cred.server), "") != 0) {
+ krb5_free_principal(context, cred.server);
+ ret = krb5_copy_principal(context, server_principal, &cred.server);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_copy_principal");
+ ret = krb5_principal_set_realm(context, cred.server, "");
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_principal_set_realm");
+ ret = krb5_cc_store_cred(context, ccache, &cred);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_cc_store_cred");
+
+ krb5_free_principal(context, cred.server);
+ ret = krb5_copy_principal(context, server_principal, &cred.server);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_copy_principal");
+ }
+ ret = krb5_cc_store_cred(context, ccache, &cred);
+ if (ret)
+ krb5_err(context, 1, ret, "krb5_cc_store_cred");
+
+ krb5_free_cred_contents(context, &cred);
+ krb5_cc_close(context, ccache);
+
+ return 0;
+}
+
+/*
+ *
+ */
+
+static void
+setup_env(krb5_context context, krb5_keytab *kt)
+{
+ krb5_error_code ret;
+
+ if (keytab_file)
+ ret = krb5_kt_resolve(context, keytab_file, kt);
+ else
+ ret = krb5_kt_default(context, kt);
+ if (ret)
+ krb5_err(context, 1, ret, "resolving keytab");
+
+ if (client_principal_str == NULL)
+ krb5_errx(context, 1, "missing client principal");
+ ret = krb5_parse_name(context, client_principal_str, &client_principal);
+ if (ret)
+ krb5_err(context, 1, ret, "resolving client name");
+
+ if (server_principal_str == NULL)
+ krb5_errx(context, 1, "missing server principal");
+ ret = krb5_parse_name(context, server_principal_str, &server_principal);
+ if (ret)
+ krb5_err(context, 1, ret, "resolving server name");
+
+ /* If no session-enc-type specified on command line and this is an afs */
+ /* service ticket, change default of session_enc_type to DES. */
+ if (session_enctype_string == NULL
+ && strcmp("afs", *server_principal->name.name_string.val) == 0)
+ session_enc_type = "des-cbc-crc";
+
+ if (ticket_flags_str) {
+ int ticket_flags_int;
+
+ ticket_flags_int = parse_flags(ticket_flags_str,
+ asn1_TicketFlags_units(), 0);
+ if (ticket_flags_int <= 0) {
+ krb5_warnx(context, "bad ticket flags: `%s'", ticket_flags_str);
+ print_flags_table(asn1_TicketFlags_units(), stderr);
+ exit(1);
+ }
+ if (ticket_flags_int)
+ ticket_flags = int2TicketFlags(ticket_flags_int);
+ }
+}
+
+/*
+ *
+ */
+
+struct getargs args[] = {
+ { "ccache", 0, arg_string, &ccache_str,
+ "name of kerberos 5 credential cache", "cache-name"},
+ { "server", 's', arg_string, &server_principal_str,
+ "name of server principal", NULL },
+ { "client", 'c', arg_string, &client_principal_str,
+ "name of client principal", NULL },
+ { "keytab", 'k', arg_string, &keytab_file,
+ "name of keytab file", NULL },
+ { "krb5", '5', arg_flag, &use_krb5,
+ "create a kerberos 5 ticket", NULL },
+ { "add", 'A', arg_flag, &add_to_ccache,
+ "add to ccache without re-initializing it", NULL },
+ { "referral", 'R', arg_flag, &use_referral_realm,
+ "store an additional entry for the service with the empty realm", NULL },
+ { "expire-time", 'e', arg_integer, &expiration_time,
+ "lifetime of ticket in seconds", NULL },
+ { "client-addresses", 'a', arg_strings, &client_addresses,
+ "addresses of client", NULL },
+ { "enc-type", 't', arg_string, &enctype_string,
+ "encryption type", NULL },
+ { "session-enc-type", 0, arg_string,&session_enctype_string,
+ "encryption type", NULL },
+ { "ticket-flags", 'f', arg_string, &ticket_flags_str,
+ "ticket flags for krb5 ticket", NULL },
+ { "version", 0, arg_flag, &version_flag, "Print version",
+ NULL },
+ { "help", 0, arg_flag, &help_flag, NULL,
+ NULL }
+};
+
+static void
+usage(int ret)
+{
+ arg_printusage(args,
+ sizeof(args) / sizeof(args[0]),
+ NULL,
+ "");
+ exit(ret);
+}
+
+int
+main(int argc, char **argv)
+{
+ int optidx = 0;
+ krb5_error_code ret;
+ krb5_context context;
+ krb5_keytab kt;
+
+ setprogname(argv[0]);
+
+ ret = krb5_init_context(&context);
+ if (ret)
+ errx(1, "krb5_init_context failed: %u", ret);
+
+ if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
+ usage(1);
+
+ if (help_flag)
+ usage(0);
+
+ if (version_flag) {
+ print_version(NULL);
+ return 0;
+ }
+
+ if (enctype_string)
+ enc_type = enctype_string;
+ if (session_enctype_string)
+ session_enc_type = session_enctype_string;
+ else
+ session_enc_type = enc_type;
+
+ setup_env(context, &kt);
+
+ if (use_krb5)
+ create_krb5_tickets(context, kt);
+
+ krb5_kt_close(context, kt);
+ krb5_free_context(context);
+
+ return 0;
+}