summaryrefslogtreecommitdiff
path: root/source4/kdc/wdc-samba4.c
blob: a58d0c2d661eb187dfbfd8281cd1551771b58c97 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/*
   Unix SMB/CIFS implementation.

   PAC Glue between Samba and the KDC

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
   Copyright (C) Simo Sorce <idra@samba.org> 2010

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "../libds/common/flags.h"
#include "auth/auth.h"
#include "kdc/kdc.h"
#include "param/param.h"
#include "kdc/pac-glue.h"

/* Given the right private pointer from hdb_samba4, get a PAC from the attached ldb messages */
static krb5_error_code samba_wdc_get_pac(void *priv, krb5_context context,
					 struct hdb_entry_ex *client,
					 krb5_pac *pac)
{
	TALLOC_CTX *mem_ctx;
	DATA_BLOB *pac_blob;
	krb5_error_code ret;
	NTSTATUS nt_status;

	mem_ctx = talloc_named(client->ctx, 0, "samba_get_pac context");
	if (!mem_ctx) {
		return ENOMEM;
	}

	nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob);
	if (!NT_STATUS_IS_OK(nt_status)) {
		talloc_free(mem_ctx);
		return EINVAL;
	}

	ret = samba_make_krb5_pac(context, pac_blob, pac);

	talloc_free(mem_ctx);
	return ret;
}

/* Resign (and reform, including possibly new groups) a PAC */

static krb5_error_code samba_wdc_reget_pac(void *priv, krb5_context context,
					   const krb5_principal client_principal,
					   struct hdb_entry_ex *client,
					   struct hdb_entry_ex *server, krb5_pac *pac)
{
	struct samba_kdc_entry *p = talloc_get_type(server->ctx, struct samba_kdc_entry);
	TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_kdc_reget_pac context");
	DATA_BLOB *pac_blob;
	krb5_error_code ret;
	NTSTATUS nt_status;

	if (!mem_ctx) {
		return ENOMEM;
	}

	pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
	if (!pac_blob) {
		talloc_free(mem_ctx);
		return ENOMEM;
	}

	/* The user account may be set not to want the PAC */
	if (!samba_princ_needs_pac(server)) {
		talloc_free(mem_ctx);
		return EINVAL;
	}

	nt_status = samba_kdc_update_pac_blob(mem_ctx, context,
					      p->kdc_db_ctx->ic_ctx,
					      pac, pac_blob);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0, ("Building PAC failed: %s\n",
			  nt_errstr(nt_status)));
		talloc_free(mem_ctx);
		return EINVAL;
	}

	/* We now completly regenerate this pac */
	krb5_pac_free(context, *pac);

	ret = samba_make_krb5_pac(context, pac_blob, pac);

	talloc_free(mem_ctx);
	return ret;
}

/* Given an hdb entry (and in particular it's private member), consult
 * the account_ok routine in auth/auth_sam.c for consistancy */
static krb5_error_code samba_wdc_check_client_access(void *priv,
						     krb5_context context,
						     krb5_kdc_configuration *config,
						     hdb_entry_ex *client_ex, const char *client_name,
						     hdb_entry_ex *server_ex, const char *server_name,
						     KDC_REQ *req,
						     krb5_data *e_data)
{
	krb5_error_code ret;
	NTSTATUS nt_status;
	TALLOC_CTX *tmp_ctx;
	struct samba_kdc_entry *p;
	char *workstation = NULL;
	HostAddresses *addresses = req->req_body.addresses;
	int i;
	bool password_change;

	tmp_ctx = talloc_new(client_ex->ctx);
	p = talloc_get_type(client_ex->ctx, struct samba_kdc_entry);

	if (!tmp_ctx) {
		return ENOMEM;
	}

	if (addresses) {
		for (i=0; i < addresses->len; i++) {
			if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
				workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
				if (workstation) {
					break;
				}
			}
		}
	}

	/* Strip space padding */
	if (workstation) {
		i = MIN(strlen(workstation), 15);
		for (; i > 0 && workstation[i - 1] == ' '; i--) {
			workstation[i - 1] = '\0';
		}
	}

	password_change = (server_ex && server_ex->entry.flags.change_pw);

	/* we allow all kinds of trusts here */
	nt_status = authsam_account_ok(tmp_ctx,
				       p->kdc_db_ctx->samdb,
				       MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
				       p->realm_dn,
				       p->msg,
				       workstation,
				       client_name, true, password_change);

	if (NT_STATUS_IS_OK(nt_status)) {
		/* Now do the standard Heimdal check */
		ret = kdc_check_flags(context, config,
				      client_ex, client_name,
				      server_ex, server_name,
				      req->msg_type == krb_as_req);
	} else {
		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
			ret = KRB5KDC_ERR_KEY_EXPIRED;
		else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
			ret = KRB5KDC_ERR_KEY_EXPIRED;
		else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
			ret = KRB5KDC_ERR_CLIENT_REVOKED;
		else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
			ret = KRB5KDC_ERR_CLIENT_REVOKED;
		else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
			ret = KRB5KDC_ERR_CLIENT_REVOKED;
		else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
			ret = KRB5KDC_ERR_CLIENT_REVOKED;
		else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
			ret = KRB5KDC_ERR_POLICY;
		else
			ret = KRB5KDC_ERR_POLICY;

		samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
	}

	return ret;
}

static krb5_error_code samba_wdc_plugin_init(krb5_context context, void **ptr)
{
	*ptr = NULL;
	return 0;
}

static void samba_wdc_plugin_fini(void *ptr)
{
	return;
}

struct krb5plugin_windc_ftable windc_plugin_table = {
	.minor_version = KRB5_WINDC_PLUGING_MINOR,
	.init = samba_wdc_plugin_init,
	.fini = samba_wdc_plugin_fini,
	.pac_generate = samba_wdc_get_pac,
	.pac_verify = samba_wdc_reget_pac,
	.client_access = samba_wdc_check_client_access,
};