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/password and swap it into
37 * an existing redentials cache
38 */
39
40krb5_error_code
41kcm_ccache_acquire(krb5_context context,
42		   kcm_ccache ccache,
43		   time_t *expire)
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    *expire = 0;
53    memset(&cred, 0, sizeof(cred));
54
55    KCM_ASSERT_VALID(ccache);
56
57    /* We need a cached key or keytab to acquire credentials */
58    if (ccache->flags & KCM_FLAGS_USE_PASSWORD) {
59	if (ccache->password == NULL)
60	    krb5_abortx(context,
61			"kcm_ccache_acquire: KCM_FLAGS_USE_PASSWORD without password");
62    } else if (ccache->flags & KCM_FLAGS_USE_KEYTAB) {
63	if (ccache->keytab == NULL)
64	    krb5_abortx(context,
65			"kcm_ccache_acquire: KCM_FLAGS_USE_KEYTAB without keytab");
66    } else {
67	kcm_log(0, "Cannot acquire initial credentials for cache %s without key",
68		ccache->name);
69	return KRB5_FCC_INTERNAL;
70    }
71
72    /* Fake up an internal ccache */
73    kcm_internal_ccache(context, ccache, &ccdata);
74
75    /* Now, actually acquire the creds */
76    if (ccache->server != NULL) {
77	ret = krb5_unparse_name(context, ccache->server, &in_tkt_service);
78	if (ret) {
79	    kcm_log(0, "Failed to unparse service name for cache %s",
80		    ccache->name);
81	    return ret;
82	}
83    }
84
85    realm = krb5_principal_get_realm(context, ccache->client);
86
87    ret = krb5_get_init_creds_opt_alloc(context, &opt);
88    if (ret)
89	goto out;
90    krb5_get_init_creds_opt_set_default_flags(context, "kcm", realm, opt);
91    if (ccache->tkt_life != 0)
92	krb5_get_init_creds_opt_set_tkt_life(opt, ccache->tkt_life);
93    if (ccache->renew_life != 0)
94	krb5_get_init_creds_opt_set_renew_life(opt, ccache->renew_life);
95
96    if (ccache->flags & KCM_FLAGS_USE_PASSWORD) {
97	ret = krb5_get_init_creds_password(context,
98					   &cred,
99					   ccache->client,
100					   ccache->password,
101					   NULL,
102					   NULL,
103					   0,
104					   in_tkt_service,
105					   opt);
106    } else {
107	ret = krb5_get_init_creds_keytab(context,
108					 &cred,
109					 ccache->client,
110					 ccache->keytab,
111					 0,
112					 in_tkt_service,
113					 opt);
114    }
115
116    if (ret) {
117	const char *msg = krb5_get_error_message(context, ret);
118	kcm_log(0, "Failed to acquire credentials for cache %s: %s",
119		ccache->name, msg);
120	krb5_free_error_message(context, msg);
121	if (in_tkt_service != NULL)
122	    free(in_tkt_service);
123	goto out;
124    }
125
126    if (in_tkt_service != NULL)
127	free(in_tkt_service);
128
129    /* Swap them in */
130    kcm_ccache_remove_creds_internal(context, ccache);
131
132    ret = kcm_ccache_store_cred_internal(context, ccache, &cred, NULL, 0);
133    if (ret) {
134	const char *msg = krb5_get_error_message(context, ret);
135	kcm_log(0, "Failed to store credentials for cache %s: %s",
136		ccache->name, msg);
137	krb5_free_error_message(context, msg);
138	krb5_free_cred_contents(context, &cred);
139	goto out;
140    }
141
142    *expire = cred.times.endtime;
143
144out:
145    if (opt)
146	krb5_get_init_creds_opt_free(context, opt);
147
148    return ret;
149}
150