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
40krb5_error_code
41kcm_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
138out:
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