Heimdal provides Kerberos PAC parsing routines. Use them.
[kai/samba.git] / source4 / kdc / pac-glue.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    PAC Glue between Samba and the KDC
5    
6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7
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 3 of the License, or
11    (at your option) any later version.
12    
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.
17
18    
19    You should have received a copy of the GNU General Public License
20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "dsdb/common/flags.h"
25 #include "lib/ldb/include/ldb.h"
26 #include "librpc/gen_ndr/ndr_krb5pac.h"
27 #include "librpc/gen_ndr/krb5pac.h"
28 #include "auth/auth.h"
29 #include "auth/auth_sam.h"
30 #include "auth/auth_sam_reply.h"
31 #include "param/param.h"
32 #include "kdc/kdc.h"
33
34 struct krb5_dh_moduli;
35 struct _krb5_krb_auth_data;
36
37 krb5_error_code samba_kdc_plugin_init(krb5_context context, void **ptr) 
38 {
39         *ptr = NULL;
40         return 0;
41 }
42
43 void    samba_kdc_plugin_fini(void *ptr) 
44 {
45         return;
46 }
47
48 static krb5_error_code make_pac(krb5_context context,
49                                 TALLOC_CTX *mem_ctx, 
50                                 struct smb_iconv_convenience *iconv_convenience,
51                                 struct auth_serversupplied_info *server_info,
52                                 krb5_pac *pac) 
53 {
54         union PAC_INFO info;
55         struct netr_SamInfo3 *info3;
56         krb5_data pac_data;
57         NTSTATUS nt_status;
58         enum ndr_err_code ndr_err;
59         DATA_BLOB pac_out;
60         krb5_error_code ret;
61
62         ZERO_STRUCT(info);
63
64         nt_status = auth_convert_server_info_saminfo3(mem_ctx, server_info, &info3);
65         if (!NT_STATUS_IS_OK(nt_status)) {
66                 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
67                 return EINVAL;
68         }
69
70         info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
71         if (!mem_ctx) {
72                 return ENOMEM;
73         }
74
75         info.logon_info.info->info3 = *info3;
76
77         ndr_err = ndr_push_union_blob(&pac_out, mem_ctx, iconv_convenience, &info,
78                                       PAC_TYPE_LOGON_INFO,
79                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
80         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
81                 nt_status = ndr_map_error2ntstatus(ndr_err);
82                 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
83                 return EINVAL;
84         }
85
86         ret = krb5_data_copy(&pac_data, pac_out.data, pac_out.length);
87         if (ret != 0) {
88                 return ret;
89         }
90
91         ret = krb5_pac_init(context, pac);
92         if (ret != 0) {
93                 krb5_data_free(&pac_data);
94                 return ret;
95         }
96
97         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
98         krb5_data_free(&pac_data);
99         if (ret != 0) {
100                 return ret;
101         }
102
103         return ret;
104 }
105
106 /* Given the right private pointer from hdb_ldb, get a PAC from the attached ldb messages */
107 krb5_error_code samba_kdc_get_pac(void *priv,
108                                   krb5_context context, 
109                                   struct hdb_entry_ex *client,
110                                   krb5_pac *pac)
111 {
112         krb5_error_code ret;
113         NTSTATUS nt_status;
114         struct auth_serversupplied_info *server_info;
115         struct hdb_ldb_private *private = talloc_get_type(client->ctx, struct hdb_ldb_private);
116         TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
117         unsigned int userAccountControl;
118
119         if (!mem_ctx) {
120                 return ENOMEM;
121         }
122
123         /* The user account may be set not to want the PAC */
124         userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
125         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
126                 *pac = NULL;
127                 return 0;
128         }
129
130         nt_status = authsam_make_server_info(mem_ctx, private->samdb, 
131                                              private->netbios_name,
132                                              private->msg, 
133                                              private->realm_ref_msg,
134                                              data_blob(NULL, 0),
135                                              data_blob(NULL, 0),
136                                              &server_info);
137         if (!NT_STATUS_IS_OK(nt_status)) {
138                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
139                           nt_errstr(nt_status)));
140                 return ENOMEM;
141         }
142
143         ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info, pac);
144
145         talloc_free(mem_ctx);
146         return ret;
147 }
148
149 /* Resign (and reform, including possibly new groups) a PAC */
150
151 krb5_error_code samba_kdc_reget_pac(void *priv, krb5_context context,
152                                 const krb5_principal client_principal,
153                                 struct hdb_entry_ex *client,  
154                                 struct hdb_entry_ex *server, krb5_pac *pac)
155 {
156         krb5_error_code ret;
157
158         unsigned int userAccountControl;
159
160         struct hdb_ldb_private *private = talloc_get_type(server->ctx, struct hdb_ldb_private);
161
162         struct auth_serversupplied_info *server_info_out;
163
164         TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
165         
166         if (!mem_ctx) {
167                 return ENOMEM;
168         }
169
170         /* The service account may be set not to want the PAC */
171         userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
172         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
173                 talloc_free(mem_ctx);
174                 *pac = NULL;
175                 return 0;
176         }
177
178         ret = kerberos_pac_to_server_info(mem_ctx, private->iconv_convenience,
179                                           *pac, context, &server_info_out);
180
181         /* We will compleatly regenerate this pac */
182         krb5_pac_free(context, *pac);
183
184         if (ret) {
185                 talloc_free(mem_ctx);
186                 return ret;
187         }
188
189         ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info_out, pac);
190
191         talloc_free(mem_ctx);
192         return ret;
193 }
194
195 static void samba_kdc_build_edata_reply(TALLOC_CTX *tmp_ctx, krb5_data *e_data,
196                                        NTSTATUS nt_status)
197 {
198         PA_DATA pa;
199         unsigned char *buf;
200         size_t len;
201         krb5_error_code ret = 0;
202
203         if (!e_data)
204                 return;
205
206         pa.padata_type          = KRB5_PADATA_PW_SALT;
207         pa.padata_value.length  = 12;
208         pa.padata_value.data    = malloc(pa.padata_value.length);
209         if (!pa.padata_value.data) {
210                 e_data->length = 0;
211                 e_data->data = NULL;
212                 return;
213         }
214
215         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
216         SIVAL(pa.padata_value.data, 4, 0);
217         SIVAL(pa.padata_value.data, 8, 1);
218
219         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
220         free(pa.padata_value.data);
221
222         e_data->data   = buf;
223         e_data->length = len;
224
225         return;
226 }
227
228 /* Given an hdb entry (and in particular it's private member), consult
229  * the account_ok routine in auth/auth_sam.c for consistancy */
230
231
232 krb5_error_code samba_kdc_check_client_access(void *priv, 
233                                               krb5_context context, hdb_entry_ex *entry_ex, 
234                                               KDC_REQ *req,
235                                               krb5_data *e_data)
236 {
237         krb5_error_code ret;
238         NTSTATUS nt_status;
239         TALLOC_CTX *tmp_ctx = talloc_new(entry_ex->ctx);
240         struct hdb_ldb_private *private = talloc_get_type(entry_ex->ctx, struct hdb_ldb_private);
241         char *name, *workstation = NULL;
242         HostAddresses *addresses = req->req_body.addresses;
243         int i;
244
245         if (!tmp_ctx) {
246                 return ENOMEM;
247         }
248         
249         ret = krb5_unparse_name(context, entry_ex->entry.principal, &name);
250         if (ret != 0) {
251                 talloc_free(tmp_ctx);
252                 return ret;
253         }
254
255         if (addresses) {
256                 for (i=0; i < addresses->len; i++) {
257                         if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
258                                 workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
259                                 if (workstation) {
260                                         break;
261                                 }
262                         }
263                 }
264         }
265
266         /* Strip space padding */
267         if (workstation) {
268                 i = MIN(strlen(workstation), 15);
269                 for (; i > 0 && workstation[i - 1] == ' '; i--) {
270                         workstation[i - 1] = '\0';
271                 }
272         }
273
274         nt_status = authsam_account_ok(tmp_ctx, 
275                                        private->samdb, 
276                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
277                                        private->msg,
278                                        private->realm_ref_msg,
279                                        workstation,
280                                        name);
281         free(name);
282
283         if (NT_STATUS_IS_OK(nt_status))
284                 return 0;
285
286         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
287                 ret = KRB5KDC_ERR_KEY_EXPIRED;
288         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
289                 ret = KRB5KDC_ERR_KEY_EXPIRED;
290         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
291                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
292         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
293                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
294         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
295                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
296         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
297                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
298         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
299                 ret = KRB5KDC_ERR_POLICY;
300         else
301                 ret = KRB5KDC_ERR_POLICY;
302
303         samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
304
305         return ret;
306 }
307