Increment array when comparing, from Harald Barth
[heimdal.git] / kcm / client.c
blob38a8449178588174d7cef1fd0a57b5ff96a38003
1 /*
2 * Copyright (c) 2005, PADL Software Pty Ltd.
3 * All rights reserved.
5 * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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.
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.
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.
35 #include "kcm_locl.h"
36 #include <pwd.h>
38 krb5_error_code
39 kcm_ccache_resolve_client(krb5_context context,
40 kcm_client *client,
41 kcm_operation opcode,
42 const char *name,
43 kcm_ccache *ccache)
45 krb5_error_code ret;
47 ret = kcm_ccache_resolve(context, name, ccache);
48 if (ret) {
49 kcm_log(1, "Failed to resolve cache %s: %s",
50 name, krb5_get_err_text(context, ret));
51 return ret;
54 ret = kcm_access(context, client, opcode, *ccache);
55 if (ret) {
56 ret = KRB5_FCC_NOFILE; /* don't disclose */
57 kcm_release_ccache(context, *ccache);
60 return ret;
63 krb5_error_code
64 kcm_ccache_destroy_client(krb5_context context,
65 kcm_client *client,
66 const char *name)
68 krb5_error_code ret;
69 kcm_ccache ccache;
71 ret = kcm_ccache_resolve(context, name, &ccache);
72 if (ret) {
73 kcm_log(1, "Failed to resolve cache %s: %s",
74 name, krb5_get_err_text(context, ret));
75 return ret;
78 ret = kcm_access(context, client, KCM_OP_DESTROY, ccache);
79 kcm_cleanup_events(context, ccache);
80 kcm_release_ccache(context, ccache);
81 if (ret)
82 return ret;
84 return kcm_ccache_destroy(context, name);
87 krb5_error_code
88 kcm_ccache_new_client(krb5_context context,
89 kcm_client *client,
90 const char *name,
91 kcm_ccache *ccache_p)
93 krb5_error_code ret;
94 kcm_ccache ccache;
96 /* We insist the ccache name starts with UID or UID: */
97 if (name_constraints != 0) {
98 char prefix[64];
99 size_t prefix_len;
100 int bad = 1;
102 snprintf(prefix, sizeof(prefix), "%ld:", (long)client->uid);
103 prefix_len = strlen(prefix);
105 if (strncmp(name, prefix, prefix_len) == 0)
106 bad = 0;
107 else {
108 prefix[prefix_len - 1] = '\0';
109 if (strcmp(name, prefix) == 0)
110 bad = 0;
113 /* Allow root to create badly-named ccaches */
114 if (bad && !CLIENT_IS_ROOT(client))
115 return KRB5_CC_BADNAME;
118 ret = kcm_ccache_resolve(context, name, &ccache);
119 if (ret == 0) {
120 if ((ccache->uid != client->uid ||
121 ccache->gid != client->gid) && !CLIENT_IS_ROOT(client))
122 return KRB5_FCC_PERM;
123 } else if (ret != KRB5_FCC_NOFILE && !(CLIENT_IS_ROOT(client) && ret == KRB5_FCC_PERM)) {
124 return ret;
127 if (ret == KRB5_FCC_NOFILE) {
128 ret = kcm_ccache_new(context, name, &ccache);
129 if (ret) {
130 kcm_log(1, "Failed to initialize cache %s: %s",
131 name, krb5_get_err_text(context, ret));
132 return ret;
135 /* bind to current client */
136 ccache->uid = client->uid;
137 ccache->gid = client->gid;
138 ccache->session = client->session;
139 } else {
140 ret = kcm_zero_ccache_data(context, ccache);
141 if (ret) {
142 kcm_log(1, "Failed to empty cache %s: %s",
143 name, krb5_get_err_text(context, ret));
144 kcm_release_ccache(context, ccache);
145 return ret;
147 kcm_cleanup_events(context, ccache);
150 ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache);
151 if (ret) {
152 kcm_release_ccache(context, ccache);
153 kcm_ccache_destroy(context, name);
154 return ret;
158 * Finally, if the user is root and the cache was created under
159 * another user's name, chown the cache to that user and their
160 * default gid.
162 if (CLIENT_IS_ROOT(client)) {
163 unsigned long uid;
164 int matches = sscanf(name,"%ld:",&uid);
165 if (matches == 0)
166 matches = sscanf(name,"%ld",&uid);
167 if (matches == 1) {
168 struct passwd *pwd = getpwuid(uid);
169 if (pwd != NULL) {
170 gid_t gid = pwd->pw_gid;
171 kcm_chown(context, client, ccache, uid, gid);
176 *ccache_p = ccache;
177 return 0;