1 /* $NetBSD: acquire.c,v 1.2 2017/01/28 21:31:44 christos Exp $ */
2
3 /*
4 * Copyright (c) 2005, 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 "kcm_locl.h"
36
37 /*
38 * Get a new ticket using a keytab/cached key and swap it into
39 * an existing redentials cache
40 */
41
42 krb5_error_code
kcm_ccache_acquire(krb5_context context,kcm_ccache ccache,krb5_creds ** credp)43 kcm_ccache_acquire(krb5_context context,
44 kcm_ccache ccache,
45 krb5_creds **credp)
46 {
47 krb5_error_code ret = 0;
48 krb5_creds cred;
49 krb5_const_realm realm;
50 krb5_get_init_creds_opt *opt = NULL;
51 krb5_ccache_data ccdata;
52 char *in_tkt_service = NULL;
53 const char *estr;
54
55 *credp = NULL;
56 memset(&cred, 0, sizeof(cred));
57
58 KCM_ASSERT_VALID(ccache);
59
60 /* We need a cached key or keytab to acquire credentials */
61 if (ccache->flags & KCM_FLAGS_USE_CACHED_KEY) {
62 if (ccache->key.keyblock.keyvalue.length == 0)
63 krb5_abortx(context,
64 "kcm_ccache_acquire: KCM_FLAGS_USE_CACHED_KEY without key");
65 } else if (ccache->flags & KCM_FLAGS_USE_KEYTAB) {
66 if (ccache->key.keytab == NULL)
67 krb5_abortx(context,
68 "kcm_ccache_acquire: KCM_FLAGS_USE_KEYTAB without keytab");
69 } else {
70 kcm_log(0, "Cannot acquire initial credentials for cache %s without key",
71 ccache->name);
72 return KRB5_FCC_INTERNAL;
73 }
74
75 HEIMDAL_MUTEX_lock(&ccache->mutex);
76
77 /* Fake up an internal ccache */
78 kcm_internal_ccache(context, ccache, &ccdata);
79
80 /* Now, actually acquire the creds */
81 if (ccache->server != NULL) {
82 ret = krb5_unparse_name(context, ccache->server, &in_tkt_service);
83 if (ret) {
84 estr = krb5_get_error_message(context, ret);
85 kcm_log(0, "Failed to unparse service principal name for cache %s: %s",
86 ccache->name, estr);
87 krb5_free_error_message(context, estr);
88 goto out;
89 }
90 }
91
92 realm = krb5_principal_get_realm(context, ccache->client);
93
94 ret = krb5_get_init_creds_opt_alloc(context, &opt);
95 if (ret)
96 goto out;
97 krb5_get_init_creds_opt_set_default_flags(context, "kcm", realm, opt);
98 if (ccache->tkt_life != 0)
99 krb5_get_init_creds_opt_set_tkt_life(opt, ccache->tkt_life);
100 if (ccache->renew_life != 0)
101 krb5_get_init_creds_opt_set_renew_life(opt, ccache->renew_life);
102
103 if (ccache->flags & KCM_FLAGS_USE_CACHED_KEY) {
104 ret = krb5_get_init_creds_keyblock(context,
105 &cred,
106 ccache->client,
107 &ccache->key.keyblock,
108 0,
109 in_tkt_service,
110 opt);
111 } else {
112 /* loosely based on lib/krb5/init_creds_pw.c */
113 ret = krb5_get_init_creds_keytab(context,
114 &cred,
115 ccache->client,
116 ccache->key.keytab,
117 0,
118 in_tkt_service,
119 opt);
120 }
121
122 if (ret) {
123 estr = krb5_get_error_message(context, ret);
124 kcm_log(0, "Failed to acquire credentials for cache %s: %s",
125 ccache->name, estr);
126 krb5_free_error_message(context, estr);
127 goto out;
128 }
129
130 /* Swap them in */
131 kcm_ccache_remove_creds_internal(context, ccache);
132
133 ret = kcm_ccache_store_cred_internal(context, ccache, &cred, 0, credp);
134 if (ret) {
135 estr = krb5_get_error_message(context, ret);
136 kcm_log(0, "Failed to store credentials for cache %s: %s",
137 ccache->name, estr);
138 krb5_free_error_message(context, estr);
139 krb5_free_cred_contents(context, &cred);
140 goto out;
141 }
142
143 out:
144 free(in_tkt_service);
145 if (opt)
146 krb5_get_init_creds_opt_free(context, opt);
147
148 HEIMDAL_MUTEX_unlock(&ccache->mutex);
149
150 return ret;
151 }
152