source: heimdal/trunk/kcm/acl.c@ 5

Last change on this file since 5 was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 5.0 KB
Line 
1/*
2 * Copyright (c) 2005, PADL Software Pty Ltd.
3 * All rights reserved.
4 *
5 * Portions Copyright (c) 2009 Apple Inc. 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 "kcm_locl.h"
36
37krb5_error_code
38kcm_access(krb5_context context,
39 kcm_client *client,
40 kcm_operation opcode,
41 kcm_ccache ccache)
42{
43 int read_p = 0;
44 int write_p = 0;
45 uint16_t mask;
46 krb5_error_code ret;
47
48 KCM_ASSERT_VALID(ccache);
49
50 switch (opcode) {
51 case KCM_OP_INITIALIZE:
52 case KCM_OP_DESTROY:
53 case KCM_OP_STORE:
54 case KCM_OP_REMOVE_CRED:
55 case KCM_OP_SET_FLAGS:
56 case KCM_OP_CHOWN:
57 case KCM_OP_CHMOD:
58 case KCM_OP_GET_INITIAL_TICKET:
59 case KCM_OP_GET_TICKET:
60 case KCM_OP_MOVE_CACHE:
61 case KCM_OP_SET_DEFAULT_CACHE:
62 case KCM_OP_SET_KDC_OFFSET:
63 write_p = 1;
64 read_p = 0;
65 break;
66 case KCM_OP_NOOP:
67 case KCM_OP_GET_NAME:
68 case KCM_OP_RESOLVE:
69 case KCM_OP_GEN_NEW:
70 case KCM_OP_RETRIEVE:
71 case KCM_OP_GET_PRINCIPAL:
72 case KCM_OP_GET_CRED_UUID_LIST:
73 case KCM_OP_GET_CRED_BY_UUID:
74 case KCM_OP_GET_CACHE_UUID_LIST:
75 case KCM_OP_GET_CACHE_BY_UUID:
76 case KCM_OP_GET_DEFAULT_CACHE:
77 case KCM_OP_GET_KDC_OFFSET:
78 write_p = 0;
79 read_p = 1;
80 break;
81 default:
82 ret = KRB5_FCC_PERM;
83 goto out;
84 }
85
86 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) {
87 /* System caches cannot be reinitialized or destroyed by users */
88 if (opcode == KCM_OP_INITIALIZE ||
89 opcode == KCM_OP_DESTROY ||
90 opcode == KCM_OP_REMOVE_CRED ||
91 opcode == KCM_OP_MOVE_CACHE) {
92 ret = KRB5_FCC_PERM;
93 goto out;
94 }
95
96 /* Let root always read system caches */
97 if (CLIENT_IS_ROOT(client)) {
98 ret = 0;
99 goto out;
100 }
101 }
102
103 /* start out with "other" mask */
104 mask = S_IROTH|S_IWOTH;
105
106 /* root can do anything */
107 if (CLIENT_IS_ROOT(client)) {
108 if (read_p)
109 mask |= S_IRUSR|S_IRGRP|S_IROTH;
110 if (write_p)
111 mask |= S_IWUSR|S_IWGRP|S_IWOTH;
112 }
113 /* same session same as owner */
114 if (kcm_is_same_session(client, ccache->uid, ccache->session)) {
115 if (read_p)
116 mask |= S_IROTH;
117 if (write_p)
118 mask |= S_IWOTH;
119 }
120 /* owner */
121 if (client->uid == ccache->uid) {
122 if (read_p)
123 mask |= S_IRUSR;
124 if (write_p)
125 mask |= S_IWUSR;
126 }
127 /* group */
128 if (client->gid == ccache->gid) {
129 if (read_p)
130 mask |= S_IRGRP;
131 if (write_p)
132 mask |= S_IWGRP;
133 }
134
135 ret = (ccache->mode & mask) ? 0 : KRB5_FCC_PERM;
136
137out:
138 if (ret) {
139 kcm_log(2, "Process %d is not permitted to call %s on cache %s",
140 client->pid, kcm_op2string(opcode), ccache->name);
141 }
142
143 return ret;
144}
145
146krb5_error_code
147kcm_chmod(krb5_context context,
148 kcm_client *client,
149 kcm_ccache ccache,
150 uint16_t mode)
151{
152 KCM_ASSERT_VALID(ccache);
153
154 /* System cache mode can only be set at startup */
155 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM)
156 return KRB5_FCC_PERM;
157
158 if (ccache->uid != client->uid)
159 return KRB5_FCC_PERM;
160
161 if (ccache->gid != client->gid)
162 return KRB5_FCC_PERM;
163
164 HEIMDAL_MUTEX_lock(&ccache->mutex);
165
166 ccache->mode = mode;
167
168 HEIMDAL_MUTEX_unlock(&ccache->mutex);
169
170 return 0;
171}
172
173krb5_error_code
174kcm_chown(krb5_context context,
175 kcm_client *client,
176 kcm_ccache ccache,
177 uid_t uid,
178 gid_t gid)
179{
180 KCM_ASSERT_VALID(ccache);
181
182 /* System cache owner can only be set at startup */
183 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM)
184 return KRB5_FCC_PERM;
185
186 if (ccache->uid != client->uid)
187 return KRB5_FCC_PERM;
188
189 if (ccache->gid != client->gid)
190 return KRB5_FCC_PERM;
191
192 HEIMDAL_MUTEX_lock(&ccache->mutex);
193
194 ccache->uid = uid;
195 ccache->gid = gid;
196
197 HEIMDAL_MUTEX_unlock(&ccache->mutex);
198
199 return 0;
200}
201
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