2 Unix SMB/CIFS implementation.
3 kerberos utility library
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Remus Koos 2001
6 Copyright (C) Luke Howard 2003
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 verify an incoming ticket and parse out the principal name and
29 authorization_data if available
31 NTSTATUS ads_verify_ticket(ADS_STRUCT *ads, const DATA_BLOB *ticket,
32 char **principal, DATA_BLOB *auth_data,
34 uint8 session_key[16])
36 NTSTATUS sret = NT_STATUS_LOGON_FAILURE;
37 krb5_context context = NULL;
38 krb5_auth_context auth_context = NULL;
39 krb5_keytab keytab = NULL;
41 krb5_ticket *tkt = NULL;
42 krb5_rcache rcache = NULL;
44 krb5_keyblock *key = NULL;
45 krb5_principal host_princ;
46 char *host_princ_s = NULL;
48 char *password_s = NULL;
50 krb5_enctype *enctypes = NULL;
52 krb5_address local_addr;
53 krb5_address remote_addr;
58 ZERO_STRUCT(password);
59 ZERO_STRUCTP(auth_data);
62 if (!secrets_init()) {
63 DEBUG(1,("secrets_init failed\n"));
64 return NT_STATUS_LOGON_FAILURE;
67 password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
69 DEBUG(1,("failed to fetch machine password\n"));
70 return NT_STATUS_LOGON_FAILURE;
73 password.data = password_s;
74 password.length = strlen(password_s);
76 ret = krb5_init_context(&context);
78 DEBUG(1,("krb5_init_context failed (%s)\n", error_message(ret)));
79 return NT_STATUS_LOGON_FAILURE;
82 ret = krb5_set_default_realm(context, ads->auth.realm);
84 DEBUG(1,("krb5_set_default_realm failed (%s)\n", error_message(ret)));
85 sret = NT_STATUS_LOGON_FAILURE;
89 /* This whole process is far more complex than I would
90 like. We have to go through all this to allow us to store
91 the secret internally, instead of using /etc/krb5.keytab */
93 ret = krb5_auth_con_init(context, &auth_context);
95 DEBUG(1,("krb5_auth_con_init failed (%s)\n", error_message(ret)));
96 sret = NT_STATUS_LOGON_FAILURE;
100 fstrcpy(myname, global_myname());
102 asprintf(&host_princ_s, "HOST/%s@%s", myname, lp_realm());
103 ret = krb5_parse_name(context, host_princ_s, &host_princ);
105 DEBUG(1,("krb5_parse_name(%s) failed (%s)\n", host_princ_s, error_message(ret)));
106 sret = NT_STATUS_LOGON_FAILURE;
111 * JRA. We must set the rcache and the allowed addresses in the auth_context
112 * here. This will prevent replay attacks and ensure the client has got a key from
113 * the correct IP address.
116 ret = krb5_get_server_rcache(context, krb5_princ_component(context, host_princ, 0), &rcache);
118 DEBUG(1,("krb5_get_server_rcache failed (%s)\n", error_message(ret)));
119 sret = NT_STATUS_LOGON_FAILURE;
123 ret = krb5_auth_con_setrcache(context, auth_context, rcache);
125 DEBUG(1,("krb5_auth_con_setrcache failed (%s)\n", error_message(ret)));
126 sret = NT_STATUS_LOGON_FAILURE;
130 /* Now we need to add the addresses.... JRA. */
132 if (!(key = (krb5_keyblock *)malloc(sizeof(*key)))) {
133 sret = NT_STATUS_NO_MEMORY;
137 if ((ret = get_kerberos_allowed_etypes(context, &enctypes))) {
138 DEBUG(1,("krb5_get_permitted_enctypes failed (%s)\n",
139 error_message(ret)));
140 sret = NT_STATUS_LOGON_FAILURE;
144 /* we need to setup a auth context with each possible encoding type in turn */
145 for (i=0;enctypes[i];i++) {
146 if (create_kerberos_key_from_string(context, host_princ, &password, key, enctypes[i])) {
150 krb5_auth_con_setuseruserkey(context, auth_context, key);
152 packet.length = ticket->length;
153 packet.data = (krb5_pointer)ticket->data;
155 if (!(ret = krb5_rd_req(context, &auth_context, &packet,
156 NULL, keytab, NULL, &tkt))) {
157 free_kerberos_etypes(context, enctypes);
164 DEBUG(3,("krb5_rd_req with auth failed (%s)\n",
165 error_message(ret)));
166 sret = NT_STATUS_LOGON_FAILURE;
170 ret = krb5_mk_rep(context, auth_context, &packet);
172 DEBUG(3,("Failed to generate mutual authentication reply (%s)\n",
173 error_message(ret)));
174 sret = NT_STATUS_LOGON_FAILURE;
178 *ap_rep = data_blob(packet.data, packet.length);
181 get_krb5_smb_session_key(context, auth_context, session_key, True);
182 #ifdef DEBUG_PASSWORD
183 DEBUG(10,("SMB session key (from ticket) follows:\n"));
184 dump_data(10, session_key, 16);
188 file_save("/tmp/ticket.dat", ticket->data, ticket->length);
191 get_auth_data_from_tkt(auth_data, tkt);
194 TALLOC_CTX *ctx = talloc_init("pac data");
195 decode_pac_data(auth_data, ctx);
200 if (tkt->enc_part2) {
201 file_save("/tmp/authdata.dat",
202 tkt->enc_part2->authorization_data[0]->contents,
203 tkt->enc_part2->authorization_data[0]->length);
206 if ((ret = krb5_unparse_name(context, get_principal_from_tkt(tkt),
208 DEBUG(3,("krb5_unparse_name failed (%s)\n",
209 error_message(ret)));
210 sret = NT_STATUS_LOGON_FAILURE;
218 if (!NT_STATUS_IS_OK(sret))
219 data_blob_free(auth_data);
221 if (!NT_STATUS_IS_OK(sret))
222 data_blob_free(ap_rep);
224 SAFE_FREE(host_princ_s);
225 SAFE_FREE(password_s);
228 krb5_auth_con_free(context, auth_context);
231 krb5_free_context(context);
236 #endif /* HAVE_KRB5 */