6be0de718e0a6aff60183fc5aa8b8a851e6e2d81
[ira/wip.git] / source4 / kdc / wdc-samba4.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> 2005-2009
7    Copyright (C) Simo Sorce <idra@samba.org> 2010
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 3 of the License, or
12    (at your option) any later version.
13
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18
19
20    You should have received a copy of the GNU General Public License
21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "../libds/common/flags.h"
26 #include "auth/auth.h"
27 #include "kdc/kdc.h"
28 #include "param/param.h"
29 #include "kdc/pac-glue.h"
30
31 /* Given the right private pointer from hdb_samba4, get a PAC from the attached ldb messages */
32 static krb5_error_code samba_wdc_get_pac(void *priv, krb5_context context,
33                                          struct hdb_entry_ex *client,
34                                          krb5_pac *pac)
35 {
36         TALLOC_CTX *mem_ctx;
37         DATA_BLOB *pac_blob;
38         krb5_error_code ret;
39         NTSTATUS nt_status;
40
41         mem_ctx = talloc_named(client->ctx, 0, "samba_get_pac context");
42         if (!mem_ctx) {
43                 return ENOMEM;
44         }
45
46         nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob);
47         if (!NT_STATUS_IS_OK(nt_status)) {
48                 talloc_free(mem_ctx);
49                 return EINVAL;
50         }
51
52         ret = samba_make_krb5_pac(context, pac_blob, pac);
53
54         talloc_free(mem_ctx);
55         return ret;
56 }
57
58 /* Resign (and reform, including possibly new groups) a PAC */
59
60 static krb5_error_code samba_wdc_reget_pac(void *priv, krb5_context context,
61                                            const krb5_principal client_principal,
62                                            struct hdb_entry_ex *client,
63                                            struct hdb_entry_ex *server, krb5_pac *pac)
64 {
65         struct samba_kdc_entry *p = talloc_get_type(server->ctx, struct samba_kdc_entry);
66         TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_kdc_reget_pac context");
67         DATA_BLOB *pac_blob;
68         krb5_error_code ret;
69         NTSTATUS nt_status;
70
71         if (!mem_ctx) {
72                 return ENOMEM;
73         }
74
75         pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
76         if (!pac_blob) {
77                 talloc_free(mem_ctx);
78                 return ENOMEM;
79         }
80
81         /* The user account may be set not to want the PAC */
82         if (!samba_princ_needs_pac(server)) {
83                 talloc_free(mem_ctx);
84                 return EINVAL;
85         }
86
87         nt_status = samba_kdc_update_pac_blob(mem_ctx, context,
88                                               p->kdc_db_ctx->ic_ctx,
89                                               pac, pac_blob);
90         if (!NT_STATUS_IS_OK(nt_status)) {
91                 DEBUG(0, ("Building PAC failed: %s\n",
92                           nt_errstr(nt_status)));
93                 talloc_free(mem_ctx);
94                 return EINVAL;
95         }
96
97         /* We now completly regenerate this pac */
98         krb5_pac_free(context, *pac);
99
100         ret = samba_make_krb5_pac(context, pac_blob, pac);
101
102         talloc_free(mem_ctx);
103         return ret;
104 }
105
106 /* Given an hdb entry (and in particular it's private member), consult
107  * the account_ok routine in auth/auth_sam.c for consistancy */
108 static krb5_error_code samba_wdc_check_client_access(void *priv,
109                                                      krb5_context context,
110                                                      krb5_kdc_configuration *config,
111                                                      hdb_entry_ex *client_ex, const char *client_name,
112                                                      hdb_entry_ex *server_ex, const char *server_name,
113                                                      KDC_REQ *req,
114                                                      krb5_data *e_data)
115 {
116         krb5_error_code ret;
117         NTSTATUS nt_status;
118         TALLOC_CTX *tmp_ctx;
119         struct samba_kdc_entry *p;
120         char *workstation = NULL;
121         HostAddresses *addresses = req->req_body.addresses;
122         int i;
123         bool password_change;
124
125         tmp_ctx = talloc_new(client_ex->ctx);
126         p = talloc_get_type(client_ex->ctx, struct samba_kdc_entry);
127
128         if (!tmp_ctx) {
129                 return ENOMEM;
130         }
131
132         if (addresses) {
133                 for (i=0; i < addresses->len; i++) {
134                         if (addresses->val[i].addr_type == KRB5_ADDRESS_NETBIOS) {
135                                 workstation = talloc_strndup(tmp_ctx, addresses->val[i].address.data, MIN(addresses->val[i].address.length, 15));
136                                 if (workstation) {
137                                         break;
138                                 }
139                         }
140                 }
141         }
142
143         /* Strip space padding */
144         if (workstation) {
145                 i = MIN(strlen(workstation), 15);
146                 for (; i > 0 && workstation[i - 1] == ' '; i--) {
147                         workstation[i - 1] = '\0';
148                 }
149         }
150
151         password_change = (server_ex && server_ex->entry.flags.change_pw);
152
153         /* we allow all kinds of trusts here */
154         nt_status = authsam_account_ok(tmp_ctx,
155                                        p->kdc_db_ctx->samdb,
156                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
157                                        p->realm_dn,
158                                        p->msg,
159                                        workstation,
160                                        client_name, true, password_change);
161
162         if (NT_STATUS_IS_OK(nt_status)) {
163                 /* Now do the standard Heimdal check */
164                 ret = kdc_check_flags(context, config,
165                                       client_ex, client_name,
166                                       server_ex, server_name,
167                                       req->msg_type == krb_as_req);
168         } else {
169                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
170                         ret = KRB5KDC_ERR_KEY_EXPIRED;
171                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
172                         ret = KRB5KDC_ERR_KEY_EXPIRED;
173                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
174                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
175                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
176                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
177                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
178                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
179                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
180                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
181                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
182                         ret = KRB5KDC_ERR_POLICY;
183                 else
184                         ret = KRB5KDC_ERR_POLICY;
185
186                 samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
187         }
188
189         return ret;
190 }
191
192 static krb5_error_code samba_wdc_plugin_init(krb5_context context, void **ptr)
193 {
194         *ptr = NULL;
195         return 0;
196 }
197
198 static void samba_wdc_plugin_fini(void *ptr)
199 {
200         return;
201 }
202
203 struct krb5plugin_windc_ftable windc_plugin_table = {
204         .minor_version = KRB5_WINDC_PLUGING_MINOR,
205         .init = samba_wdc_plugin_init,
206         .fini = samba_wdc_plugin_fini,
207         .pac_generate = samba_wdc_get_pac,
208         .pac_verify = samba_wdc_reget_pac,
209         .client_access = samba_wdc_check_client_access,
210 };
211
212