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1 /*-
2  * Copyright (c) 2005 Doug Rabson
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  *      $FreeBSD$
27  */
28
29 #include <gssapi/gssapi.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <errno.h>
33
34 #include "mech_switch.h"
35 #include "utils.h"
36 #include "name.h"
37
38 static OM_uint32
39 _gss_import_export_name(OM_uint32 *minor_status,
40     const gss_buffer_t input_name_buffer,
41     gss_name_t *output_name)
42 {
43         OM_uint32 major_status;
44         unsigned char *p = input_name_buffer->value;
45         size_t len = input_name_buffer->length;
46         size_t t;
47         gss_OID_desc mech_oid;
48         struct _gss_mech_switch *m;
49         struct _gss_name *name;
50         struct _gss_mechanism_name *mn;
51         gss_name_t new_canonical_name;
52
53         *minor_status = 0;
54         *output_name = 0;
55
56         /*
57          * Make sure that TOK_ID is {4, 1}.
58          */
59         if (len < 2)
60                 return (GSS_S_BAD_NAME);
61         if (p[0] != 4 || p[1] != 1)
62                 return (GSS_S_BAD_NAME);
63         p += 2;
64         len -= 2;
65
66         /*
67          * Get the mech length and the name length and sanity
68          * check the size of of the buffer.
69          */
70         if (len < 2)
71                 return (GSS_S_BAD_NAME);
72         t = (p[0] << 8) + p[1];
73         p += 2;
74         len -= 2;
75
76         /*
77          * Check the DER encoded OID to make sure it agrees with the
78          * length we just decoded.
79          */
80         if (p[0] != 6)          /* 6=OID */
81                 return (GSS_S_BAD_NAME);
82         p++;
83         len--;
84         t--;
85         if (p[0] & 0x80) {
86                 int digits = p[0];
87                 p++;
88                 len--;
89                 t--;
90                 mech_oid.length = 0;
91                 while (digits--) {
92                         mech_oid.length = (mech_oid.length << 8) | p[0];
93                         p++;
94                         len--;
95                         t--;
96                 }
97         } else {
98                 mech_oid.length = p[0];
99                 p++;
100                 len--;
101                 t--;
102         }
103         if (mech_oid.length != t)
104                 return (GSS_S_BAD_NAME);
105
106         mech_oid.elements = p;
107
108         if (len < t + 4)
109                 return (GSS_S_BAD_NAME);
110         p += t;
111         len -= t;
112
113         t = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
114         p += 4;
115         len -= 4;
116
117         if (len != t)
118                 return (GSS_S_BAD_NAME);
119
120         m = _gss_find_mech_switch(&mech_oid);
121         if (!m)
122                 return (GSS_S_BAD_MECH);
123
124         /*
125          * Ask the mechanism to import the name.
126          */
127         major_status = m->gm_import_name(minor_status,
128             input_name_buffer, GSS_C_NT_EXPORT_NAME, &new_canonical_name);
129
130         /*
131          * Now we make a new name and mark it as an MN.
132          */
133         name = _gss_make_name(m, new_canonical_name);
134         if (!name) {
135                 m->gm_release_name(minor_status, &new_canonical_name);
136                 return (GSS_S_FAILURE);
137         }
138
139         *output_name = (gss_name_t) name;
140
141         *minor_status = 0;
142         return (GSS_S_COMPLETE);
143 }
144
145 OM_uint32
146 gss_import_name(OM_uint32 *minor_status,
147     const gss_buffer_t input_name_buffer,
148     const gss_OID input_name_type,
149     gss_name_t *output_name)
150 {
151         gss_OID                 name_type = input_name_type;
152         OM_uint32               major_status;
153         struct _gss_name        *name;
154
155         if (input_name_buffer->length == 0) {
156                 *minor_status = 0;
157                 *output_name = 0;
158                 return (GSS_S_BAD_NAME);
159         }
160
161         /*
162          * Use GSS_NT_USER_NAME as default name type.
163          */
164         if (name_type == GSS_C_NO_OID)
165                 name_type = GSS_C_NT_USER_NAME;
166
167         /*
168          * If this is an exported name, we need to parse it to find
169          * the mechanism and then import it as an MN. See RFC 2743
170          * section 3.2 for a description of the format.
171          */
172         if (_gss_oid_equal(name_type, GSS_C_NT_EXPORT_NAME)) {
173                 return _gss_import_export_name(minor_status,
174                     input_name_buffer, output_name);
175         }
176
177         /*
178          * Only allow certain name types. This is pretty bogus - we
179          * should figure out the list of supported name types using
180          * gss_inquire_names_for_mech.
181          */
182         if (!_gss_oid_equal(name_type, GSS_C_NT_USER_NAME)
183             && !_gss_oid_equal(name_type, GSS_C_NT_MACHINE_UID_NAME)
184             && !_gss_oid_equal(name_type, GSS_C_NT_STRING_UID_NAME)
185             && !_gss_oid_equal(name_type, GSS_C_NT_HOSTBASED_SERVICE_X)
186             && !_gss_oid_equal(name_type, GSS_C_NT_HOSTBASED_SERVICE)
187             && !_gss_oid_equal(name_type, GSS_C_NT_ANONYMOUS)
188             && !_gss_oid_equal(name_type, GSS_KRB5_NT_PRINCIPAL_NAME)) {
189                 *minor_status = 0;
190                 *output_name = 0;
191                 return (GSS_S_BAD_NAMETYPE);
192         }
193
194         *minor_status = 0;
195         name = malloc(sizeof(struct _gss_name));
196         if (!name) {
197                 *minor_status = ENOMEM;
198                 return (GSS_S_FAILURE);
199         }
200         memset(name, 0, sizeof(struct _gss_name));
201
202         major_status = _gss_copy_oid(minor_status,
203             name_type, &name->gn_type);
204         if (major_status) {
205                 free(name);
206                 return (GSS_S_FAILURE);
207         }
208
209         major_status = _gss_copy_buffer(minor_status,
210             input_name_buffer, &name->gn_value);
211         if (major_status) {
212                 gss_release_name(minor_status, (gss_name_t*) &name);
213                 return (GSS_S_FAILURE);
214         }
215
216         SLIST_INIT(&name->gn_mn);
217
218         *output_name = (gss_name_t) name;
219         return (GSS_S_COMPLETE);
220 }