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-rw-r--r--source3/libads/kerberos_verify.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/source3/libads/kerberos_verify.c b/source3/libads/kerberos_verify.c
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+++ b/source3/libads/kerberos_verify.c
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+/*
+ Unix SMB/CIFS implementation.
+ kerberos utility library
+ Copyright (C) Andrew Tridgell 2001
+ Copyright (C) Remus Koos 2001
+
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+#ifdef HAVE_KRB5
+
+/*
+ verify an incoming ticket and parse out the principal name and
+ authorization_data if available
+*/
+NTSTATUS ads_verify_ticket(ADS_STRUCT *ads, const DATA_BLOB *ticket,
+ char **principal, DATA_BLOB *auth_data)
+{
+ krb5_context context;
+ krb5_auth_context auth_context = NULL;
+ krb5_keytab keytab = NULL;
+ krb5_data packet;
+ krb5_ticket *tkt = NULL;
+ krb5_data salt;
+ krb5_encrypt_block eblock;
+ int ret;
+ krb5_keyblock * key;
+ krb5_principal host_princ;
+ char *host_princ_s;
+ extern pstring global_myname;
+ fstring myname;
+ char *password_s;
+ krb5_data password;
+
+ if (!secrets_init()) {
+ DEBUG(1,("secrets_init failed\n"));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ password_s = secrets_fetch_machine_password();
+ if (!password_s) {
+ DEBUG(1,("failed to fetch machine password\n"));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ password.data = password_s;
+ password.length = strlen(password_s);
+
+ ret = krb5_init_context(&context);
+ if (ret) {
+ DEBUG(1,("krb5_init_context failed (%s)\n", error_message(ret)));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ ret = krb5_set_default_realm(context, ads->realm);
+ if (ret) {
+ DEBUG(1,("krb5_set_default_realm failed (%s)\n", error_message(ret)));
+ ads_destroy(&ads);
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ /* this whole process is far more complex than I would
+ like. We have to go through all this to allow us to store
+ the secret internally, instead of using /etc/krb5.keytab */
+ ret = krb5_auth_con_init(context, &auth_context);
+ if (ret) {
+ DEBUG(1,("krb5_auth_con_init failed (%s)\n", error_message(ret)));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ fstrcpy(myname, global_myname);
+ strlower(myname);
+ asprintf(&host_princ_s, "HOST/%s@%s", myname, lp_realm());
+ ret = krb5_parse_name(context, host_princ_s, &host_princ);
+ if (ret) {
+ DEBUG(1,("krb5_parse_name(%s) failed (%s)\n", host_princ_s, error_message(ret)));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ ret = krb5_principal2salt(context, host_princ, &salt);
+ if (ret) {
+ DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ if (!(key = (krb5_keyblock *)malloc(sizeof(*key)))) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ krb5_use_enctype(context, &eblock, ENCTYPE_DES_CBC_MD5);
+
+ ret = krb5_string_to_key(context, &eblock, key, &password, &salt);
+ if (ret) {
+ DEBUG(1,("krb5_string_to_key failed (%s)\n", error_message(ret)));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ krb5_auth_con_setuseruserkey(context, auth_context, key);
+
+ packet.length = ticket->length;
+ packet.data = (krb5_pointer)ticket->data;
+
+#if 0
+ file_save("/tmp/ticket.dat", ticket->data, ticket->length);
+#endif
+
+ if ((ret = krb5_rd_req(context, &auth_context, &packet,
+ NULL, keytab, NULL, &tkt))) {
+ DEBUG(3,("krb5_rd_req with auth failed (%s)\n",
+ error_message(ret)));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ if (tkt->enc_part2) {
+ *auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents,
+ tkt->enc_part2->authorization_data[0]->length);
+ }
+
+#if 0
+ if (tkt->enc_part2) {
+ file_save("/tmp/authdata.dat",
+ tkt->enc_part2->authorization_data[0]->contents,
+ tkt->enc_part2->authorization_data[0]->length);
+ }
+#endif
+
+ if ((ret = krb5_unparse_name(context, tkt->enc_part2->client, principal))) {
+ DEBUG(3,("krb5_unparse_name failed (%s)\n",
+ error_message(ret)));
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ return NT_STATUS_OK;
+}
+
+#endif