less dup rk_
[heimdal.git] / kcm / acl.c
blob2823260cab0e28c5b49fd205fdeacace3eadef3c
1 /*
2 * Copyright (c) 2005, PADL Software Pty Ltd.
3 * All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of PADL Software nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
33 #include "kcm_locl.h"
35 RCSID("$Id$");
37 krb5_error_code
38 kcm_access(krb5_context context,
39 kcm_client *client,
40 kcm_operation opcode,
41 kcm_ccache ccache)
43 int read_p = 0;
44 int write_p = 0;
45 uint16_t mask;
46 krb5_error_code ret;
48 KCM_ASSERT_VALID(ccache);
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 write_p = 1;
62 read_p = 0;
63 break;
64 case KCM_OP_NOOP:
65 case KCM_OP_GET_NAME:
66 case KCM_OP_RESOLVE:
67 case KCM_OP_GEN_NEW:
68 case KCM_OP_RETRIEVE:
69 case KCM_OP_GET_PRINCIPAL:
70 case KCM_OP_GET_FIRST:
71 case KCM_OP_GET_NEXT:
72 case KCM_OP_END_GET:
73 case KCM_OP_MAX:
74 write_p = 0;
75 read_p = 1;
76 break;
79 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) {
80 /* System caches cannot be reinitialized or destroyed by users */
81 if (opcode == KCM_OP_INITIALIZE ||
82 opcode == KCM_OP_DESTROY ||
83 opcode == KCM_OP_REMOVE_CRED ||
84 opcode == KCM_OP_MOVE_CACHE) {
85 ret = KRB5_FCC_PERM;
86 goto out;
89 /* Let root always read system caches */
90 if (client->uid == 0) {
91 ret = 0;
92 goto out;
96 mask = 0;
98 /* Root may do whatever they like */
99 if (client->uid == ccache->uid || CLIENT_IS_ROOT(client)) {
100 if (read_p)
101 mask |= S_IRUSR;
102 if (write_p)
103 mask |= S_IWUSR;
104 } else if (client->gid == ccache->gid || CLIENT_IS_ROOT(client)) {
105 if (read_p)
106 mask |= S_IRGRP;
107 if (write_p)
108 mask |= S_IWGRP;
109 } else {
110 if (read_p)
111 mask |= S_IROTH;
112 if (write_p)
113 mask |= S_IWOTH;
116 ret = ((ccache->mode & mask) == mask) ? 0 : KRB5_FCC_PERM;
118 out:
119 if (ret) {
120 kcm_log(2, "Process %d is not permitted to call %s on cache %s",
121 client->pid, kcm_op2string(opcode), ccache->name);
124 return ret;
127 krb5_error_code
128 kcm_chmod(krb5_context context,
129 kcm_client *client,
130 kcm_ccache ccache,
131 uint16_t mode)
133 KCM_ASSERT_VALID(ccache);
135 /* System cache mode can only be set at startup */
136 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM)
137 return KRB5_FCC_PERM;
139 if (ccache->uid != client->uid)
140 return KRB5_FCC_PERM;
142 if (ccache->gid != client->gid)
143 return KRB5_FCC_PERM;
145 HEIMDAL_MUTEX_lock(&ccache->mutex);
147 ccache->mode = mode;
149 HEIMDAL_MUTEX_unlock(&ccache->mutex);
151 return 0;
154 krb5_error_code
155 kcm_chown(krb5_context context,
156 kcm_client *client,
157 kcm_ccache ccache,
158 uid_t uid,
159 gid_t gid)
161 KCM_ASSERT_VALID(ccache);
163 /* System cache owner can only be set at startup */
164 if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM)
165 return KRB5_FCC_PERM;
167 if (ccache->uid != client->uid)
168 return KRB5_FCC_PERM;
170 if (ccache->gid != client->gid)
171 return KRB5_FCC_PERM;
173 HEIMDAL_MUTEX_lock(&ccache->mutex);
175 ccache->uid = uid;
176 ccache->gid = gid;
178 HEIMDAL_MUTEX_unlock(&ccache->mutex);
180 return 0;