gss_authorize_localname.c revision 1.1.1.1.8.2 
1/*	$NetBSD: gss_authorize_localname.c,v 1.1.1.1.8.2 2014/08/19 23:45:17 tls Exp $	*/
2
3/*
4 * Copyright (c) 2011, PADL Software Pty Ltd.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * 3. Neither the name of PADL Software nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "mech_locl.h"
36
37gss_buffer_desc GSSAPI_LIB_VARIABLE __gss_c_attr_local_login_user =  {
38    sizeof("local-login-user") - 1,
39    "local-login-user"
40};
41
42static OM_uint32
43mech_authorize_localname(OM_uint32 *minor_status,
44	                 const struct _gss_name *name,
45	                 const struct _gss_name *user)
46{
47    OM_uint32 major_status = GSS_S_NAME_NOT_MN;
48    struct _gss_mechanism_name *mn;
49
50    HEIM_SLIST_FOREACH(mn, &name->gn_mn, gmn_link) {
51        gssapi_mech_interface m = mn->gmn_mech;
52
53        if (m->gm_authorize_localname == NULL) {
54            major_status = GSS_S_UNAVAILABLE;
55            continue;
56        }
57
58        major_status = m->gm_authorize_localname(minor_status,
59                                                 mn->gmn_name,
60                                                 &user->gn_value,
61                                                 &user->gn_type);
62        if (major_status != GSS_S_UNAUTHORIZED)
63            break;
64    }
65
66    return major_status;
67}
68
69/*
70 * Naming extensions based local login authorization.
71 */
72static OM_uint32
73attr_authorize_localname(OM_uint32 *minor_status,
74	                 const struct _gss_name *name,
75	                 const struct _gss_name *user)
76{
77    OM_uint32 major_status = GSS_S_UNAVAILABLE;
78    int more = -1;
79
80    if (!gss_oid_equal(&user->gn_type, GSS_C_NT_USER_NAME))
81        return GSS_S_BAD_NAMETYPE;
82
83    while (more != 0 && major_status != GSS_S_COMPLETE) {
84	OM_uint32 tmpMajor, tmpMinor;
85	gss_buffer_desc value;
86	gss_buffer_desc display_value;
87	int authenticated = 0, complete = 0;
88
89	tmpMajor = gss_get_name_attribute(minor_status,
90					  (gss_name_t)name,
91					  GSS_C_ATTR_LOCAL_LOGIN_USER,
92					  &authenticated,
93					  &complete,
94					  &value,
95					  &display_value,
96					  &more);
97	if (GSS_ERROR(tmpMajor)) {
98	    major_status = tmpMajor;
99	    break;
100	}
101
102	/* If attribute is present, return an authoritative error code. */
103	if (authenticated &&
104	    value.length == user->gn_value.length &&
105	    memcmp(value.value, user->gn_value.value, user->gn_value.length) == 0)
106	    major_status = GSS_S_COMPLETE;
107	else
108	    major_status = GSS_S_UNAUTHORIZED;
109
110	gss_release_buffer(&tmpMinor, &value);
111	gss_release_buffer(&tmpMinor, &display_value);
112    }
113
114    return major_status;
115}
116
117GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
118gss_authorize_localname(OM_uint32 *minor_status,
119	                const gss_name_t gss_name,
120	                const gss_name_t gss_user)
121
122{
123    OM_uint32 major_status;
124    const struct _gss_name *name = (const struct _gss_name *) gss_name;
125    const struct _gss_name *user = (const struct _gss_name *) gss_user;
126    int mechAvailable = 0;
127
128    *minor_status = 0;
129
130    if (gss_name == GSS_C_NO_NAME || gss_user == GSS_C_NO_NAME)
131        return GSS_S_CALL_INACCESSIBLE_READ;
132
133    /*
134     * We should check that the user name is not a mechanism name, but
135     * as Heimdal always calls the mechanism's gss_import_name(), it's
136     * not possible to make this check.
137     */
138#if 0
139    if (HEIM_SLIST_FIRST(&user->gn_mn) != NULL)
140        return GSS_S_BAD_NAME;
141#endif
142
143    /* If mech returns yes, we return yes */
144    major_status = mech_authorize_localname(minor_status, name, user);
145    if (major_status == GSS_S_COMPLETE)
146	return GSS_S_COMPLETE;
147    else if (major_status != GSS_S_UNAVAILABLE)
148	mechAvailable = 1;
149
150    /* If attribute exists, it is authoritative */
151    major_status = attr_authorize_localname(minor_status, name, user);
152    if (major_status == GSS_S_COMPLETE || major_status == GSS_S_UNAUTHORIZED)
153	return major_status;
154
155    /* If mechanism did not implement SPI, compare the local name */
156    if (mechAvailable == 0) {
157	int match = 0;
158
159        major_status = gss_compare_name(minor_status, gss_name,
160                                        gss_user, &match);
161	if (major_status == GSS_S_COMPLETE && match == 0)
162	    major_status = GSS_S_UNAUTHORIZED;
163    }
164
165    return major_status;
166}
167
168GSSAPI_LIB_FUNCTION int GSSAPI_LIB_CALL
169gss_userok(const gss_name_t name,
170           const char *user)
171{
172    OM_uint32 major_status, minor_status;
173    gss_buffer_desc userBuf;
174    gss_name_t userName;
175
176    userBuf.value = (void *)user;
177    userBuf.length = strlen(user);
178
179    major_status = gss_import_name(&minor_status, &userBuf,
180                                   GSS_C_NT_USER_NAME, &userName);
181    if (GSS_ERROR(major_status))
182        return 0;
183
184    major_status = gss_authorize_localname(&minor_status, name, userName);
185
186    gss_release_name(&minor_status, &userName);
187
188    return (major_status == GSS_S_COMPLETE);
189}
190