1/*
2 * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "gsskrb5_locl.h"
35
36static OM_uint32
37parse_krb5_name (OM_uint32 *minor_status,
38		 krb5_context context,
39		 const char *name,
40		 gss_name_t *output_name)
41{
42    krb5_principal princ;
43    krb5_error_code kerr;
44
45    kerr = krb5_parse_name (context, name, &princ);
46
47    if (kerr == 0) {
48	*output_name = (gss_name_t)princ;
49	return GSS_S_COMPLETE;
50    }
51    *minor_status = kerr;
52
53    if (kerr == KRB5_PARSE_ILLCHAR || kerr == KRB5_PARSE_MALFORMED)
54	return GSS_S_BAD_NAME;
55
56    return GSS_S_FAILURE;
57}
58
59static OM_uint32
60import_krb5_name (OM_uint32 *minor_status,
61		  krb5_context context,
62		  const gss_buffer_t input_name_buffer,
63		  gss_name_t *output_name)
64{
65    OM_uint32 ret;
66    char *tmp;
67
68    tmp = malloc (input_name_buffer->length + 1);
69    if (tmp == NULL) {
70	*minor_status = ENOMEM;
71	return GSS_S_FAILURE;
72    }
73    memcpy (tmp,
74	    input_name_buffer->value,
75	    input_name_buffer->length);
76    tmp[input_name_buffer->length] = '\0';
77
78    ret = parse_krb5_name(minor_status, context, tmp, output_name);
79    free(tmp);
80
81    return ret;
82}
83
84OM_uint32
85_gsskrb5_canon_name(OM_uint32 *minor_status, krb5_context context,
86		    int use_dns, krb5_const_principal sourcename, gss_name_t targetname,
87		    krb5_principal *out)
88{
89    krb5_principal p = (krb5_principal)targetname;
90    krb5_error_code ret;
91    char *hostname = NULL, *service;
92
93    *minor_status = 0;
94
95    /* If its not a hostname */
96    if (krb5_principal_get_type(context, p) != MAGIC_HOSTBASED_NAME_TYPE) {
97	ret = krb5_copy_principal(context, p, out);
98    } else if (!use_dns) {
99	ret = krb5_copy_principal(context, p, out);
100	if (ret)
101	    goto out;
102	krb5_principal_set_type(context, *out, KRB5_NT_SRV_HST);
103	if (sourcename)
104	    ret = krb5_principal_set_realm(context, *out, sourcename->realm);
105    } else {
106	if (p->name.name_string.len == 0)
107	    return GSS_S_BAD_NAME;
108	else if (p->name.name_string.len > 1)
109	    hostname = p->name.name_string.val[1];
110
111	service = p->name.name_string.val[0];
112
113	ret = krb5_sname_to_principal(context,
114				      hostname,
115				      service,
116				      KRB5_NT_SRV_HST,
117				      out);
118    }
119
120 out:
121    if (ret) {
122	*minor_status = ret;
123	return GSS_S_FAILURE;
124    }
125
126    return 0;
127}
128
129
130static OM_uint32
131import_hostbased_name (OM_uint32 *minor_status,
132		       krb5_context context,
133		       const gss_buffer_t input_name_buffer,
134		       gss_name_t *output_name)
135{
136    krb5_principal princ = NULL;
137    krb5_error_code kerr;
138    char *tmp, *p, *host = NULL;
139
140    tmp = malloc (input_name_buffer->length + 1);
141    if (tmp == NULL) {
142	*minor_status = ENOMEM;
143	return GSS_S_FAILURE;
144    }
145    memcpy (tmp,
146	    input_name_buffer->value,
147	    input_name_buffer->length);
148    tmp[input_name_buffer->length] = '\0';
149
150    p = strchr (tmp, '@');
151    if (p != NULL) {
152	*p = '\0';
153	host = p + 1;
154    }
155
156    kerr = krb5_make_principal(context, &princ, NULL, tmp, host, NULL);
157    free (tmp);
158    *minor_status = kerr;
159    if (kerr == KRB5_PARSE_ILLCHAR || kerr == KRB5_PARSE_MALFORMED)
160	return GSS_S_BAD_NAME;
161    else if (kerr)
162	return GSS_S_FAILURE;
163
164    krb5_principal_set_type(context, princ, MAGIC_HOSTBASED_NAME_TYPE);
165    *output_name = (gss_name_t)princ;
166
167    return 0;
168}
169
170static OM_uint32
171import_export_name (OM_uint32 *minor_status,
172		    krb5_context context,
173		    const gss_buffer_t input_name_buffer,
174		    gss_name_t *output_name)
175{
176    unsigned char *p;
177    uint32_t length;
178    OM_uint32 ret;
179    char *name;
180
181    if (input_name_buffer->length < 10 + GSS_KRB5_MECHANISM->length)
182	return GSS_S_BAD_NAME;
183
184    /* TOK, MECH_OID_LEN, DER(MECH_OID), NAME_LEN, NAME */
185
186    p = input_name_buffer->value;
187
188    if (memcmp(&p[0], "\x04\x01\x00", 3) != 0 ||
189	p[3] != GSS_KRB5_MECHANISM->length + 2 ||
190	p[4] != 0x06 ||
191	p[5] != GSS_KRB5_MECHANISM->length ||
192	memcmp(&p[6], GSS_KRB5_MECHANISM->elements,
193	       GSS_KRB5_MECHANISM->length) != 0)
194	return GSS_S_BAD_NAME;
195
196    p += 6 + GSS_KRB5_MECHANISM->length;
197
198    length = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
199    p += 4;
200
201    if (length > input_name_buffer->length - 10 - GSS_KRB5_MECHANISM->length)
202	return GSS_S_BAD_NAME;
203
204    name = malloc(length + 1);
205    if (name == NULL) {
206	*minor_status = ENOMEM;
207	return GSS_S_FAILURE;
208    }
209    memcpy(name, p, length);
210    name[length] = '\0';
211
212    ret = parse_krb5_name(minor_status, context, name, output_name);
213    free(name);
214
215    return ret;
216}
217
218OM_uint32 GSSAPI_CALLCONV _gsskrb5_import_name
219           (OM_uint32 * minor_status,
220            const gss_buffer_t input_name_buffer,
221            const gss_OID input_name_type,
222            gss_name_t * output_name
223           )
224{
225    krb5_context context;
226
227    *minor_status = 0;
228    *output_name = GSS_C_NO_NAME;
229
230    GSSAPI_KRB5_INIT (&context);
231
232    if (gss_oid_equal(input_name_type, GSS_C_NT_HOSTBASED_SERVICE) ||
233	gss_oid_equal(input_name_type, GSS_C_NT_HOSTBASED_SERVICE_X))
234	return import_hostbased_name (minor_status,
235				      context,
236				      input_name_buffer,
237				      output_name);
238    else if (input_name_type == GSS_C_NO_OID
239	     || gss_oid_equal(input_name_type, GSS_C_NT_USER_NAME)
240	     || gss_oid_equal(input_name_type, GSS_KRB5_NT_PRINCIPAL_NAME))
241 	/* default printable syntax */
242	return import_krb5_name (minor_status,
243				 context,
244				 input_name_buffer,
245				 output_name);
246    else if (gss_oid_equal(input_name_type, GSS_C_NT_EXPORT_NAME)) {
247	return import_export_name(minor_status,
248				  context,
249				  input_name_buffer,
250				  output_name);
251    } else {
252	*minor_status = 0;
253	return GSS_S_BAD_NAMETYPE;
254    }
255}
256