1 /*
2 * Copyright (c) 2005, PADL Software Pty Ltd.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
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.
15 *
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.
19 *
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.
31 */
32
33 #include "kcm_locl.h"
34
35 /*
36 * Get a new ticket using a keytab/cached key and swap it into
37 * an existing redentials cache
38 */
39
40 krb5_error_code
kcm_ccache_acquire(krb5_context context,kcm_ccache ccache,krb5_creds ** credp)41 kcm_ccache_acquire(krb5_context context,
42 kcm_ccache ccache,
43 krb5_creds **credp)
44 {
45 krb5_error_code ret = 0;
46 krb5_creds cred;
47 krb5_const_realm realm;
48 krb5_get_init_creds_opt *opt = NULL;
49 krb5_ccache_data ccdata;
50 char *in_tkt_service = NULL;
51
52 memset(&cred, 0, sizeof(cred));
53
54 KCM_ASSERT_VALID(ccache);
55
56 /* We need a cached key or keytab to acquire credentials */
57 if (ccache->flags & KCM_FLAGS_USE_CACHED_KEY) {
58 if (ccache->key.keyblock.keyvalue.length == 0)
59 krb5_abortx(context,
60 "kcm_ccache_acquire: KCM_FLAGS_USE_CACHED_KEY without key");
61 } else if (ccache->flags & KCM_FLAGS_USE_KEYTAB) {
62 if (ccache->key.keytab == NULL)
63 krb5_abortx(context,
64 "kcm_ccache_acquire: KCM_FLAGS_USE_KEYTAB without keytab");
65 } else {
66 kcm_log(0, "Cannot acquire initial credentials for cache %s without key",
67 ccache->name);
68 return KRB5_FCC_INTERNAL;
69 }
70
71 HEIMDAL_MUTEX_lock(&ccache->mutex);
72
73 /* Fake up an internal ccache */
74 kcm_internal_ccache(context, ccache, &ccdata);
75
76 /* Now, actually acquire the creds */
77 if (ccache->server != NULL) {
78 ret = krb5_unparse_name(context, ccache->server, &in_tkt_service);
79 if (ret) {
80 kcm_log(0, "Failed to unparse service principal name for cache %s: %s",
81 ccache->name, krb5_get_err_text(context, ret));
82 return ret;
83 }
84 }
85
86 realm = krb5_principal_get_realm(context, ccache->client);
87
88 ret = krb5_get_init_creds_opt_alloc(context, &opt);
89 if (ret)
90 goto out;
91 krb5_get_init_creds_opt_set_default_flags(context, "kcm", realm, opt);
92 if (ccache->tkt_life != 0)
93 krb5_get_init_creds_opt_set_tkt_life(opt, ccache->tkt_life);
94 if (ccache->renew_life != 0)
95 krb5_get_init_creds_opt_set_renew_life(opt, ccache->renew_life);
96
97 if (ccache->flags & KCM_FLAGS_USE_CACHED_KEY) {
98 ret = krb5_get_init_creds_keyblock(context,
99 &cred,
100 ccache->client,
101 &ccache->key.keyblock,
102 0,
103 in_tkt_service,
104 opt);
105 } else {
106 /* loosely based on lib/krb5/init_creds_pw.c */
107 ret = krb5_get_init_creds_keytab(context,
108 &cred,
109 ccache->client,
110 ccache->key.keytab,
111 0,
112 in_tkt_service,
113 opt);
114 }
115
116 if (ret) {
117 kcm_log(0, "Failed to acquire credentials for cache %s: %s",
118 ccache->name, krb5_get_err_text(context, ret));
119 if (in_tkt_service != NULL)
120 free(in_tkt_service);
121 goto out;
122 }
123
124 if (in_tkt_service != NULL)
125 free(in_tkt_service);
126
127 /* Swap them in */
128 kcm_ccache_remove_creds_internal(context, ccache);
129
130 ret = kcm_ccache_store_cred_internal(context, ccache, &cred, 0, credp);
131 if (ret) {
132 kcm_log(0, "Failed to store credentials for cache %s: %s",
133 ccache->name, krb5_get_err_text(context, ret));
134 krb5_free_cred_contents(context, &cred);
135 goto out;
136 }
137
138 out:
139 if (opt)
140 krb5_get_init_creds_opt_free(context, opt);
141
142 HEIMDAL_MUTEX_unlock(&ccache->mutex);
143
144 return ret;
145 }
146