get_for_creds.c revision 72445 
1/*
2 * Copyright (c) 1997 - 2000 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <krb5_locl.h>
35
36RCSID("$Id: get_for_creds.c,v 1.27 2000/08/18 06:47:40 assar Exp $");
37
38static krb5_error_code
39add_addrs(krb5_context context,
40	  krb5_addresses *addr,
41	  struct addrinfo *ai)
42{
43    krb5_error_code ret;
44    unsigned n, i, j;
45    void *tmp;
46    struct addrinfo *a;
47
48    n = 0;
49    for (a = ai; a != NULL; a = a->ai_next)
50	++n;
51
52    i = addr->len;
53    addr->len += n;
54    tmp = realloc(addr->val, addr->len * sizeof(*addr->val));
55    if (tmp == NULL) {
56	ret = ENOMEM;
57	goto fail;
58    }
59    addr->val = tmp;
60    for (j = i; j < addr->len; ++j) {
61	addr->val[i].addr_type = 0;
62	krb5_data_zero(&addr->val[i].address);
63    }
64    for (a = ai; a != NULL; a = a->ai_next) {
65	ret = krb5_sockaddr2address (a->ai_addr, &addr->val[i]);
66	if (ret == 0)
67	    ++i;
68	else if (ret != KRB5_PROG_ATYPE_NOSUPP)
69	    goto fail;
70    }
71    addr->len = i;
72    return 0;
73fail:
74    krb5_free_addresses (context, addr);
75    return ret;
76}
77
78/*
79 *
80 */
81
82krb5_error_code
83krb5_fwd_tgt_creds (krb5_context	context,
84		    krb5_auth_context	auth_context,
85		    const char		*hostname,
86		    krb5_principal	client,
87		    krb5_principal	server,
88		    krb5_ccache		ccache,
89		    int			forwardable,
90		    krb5_data		*out_data)
91{
92    krb5_flags flags = 0;
93    krb5_creds creds;
94    krb5_error_code ret;
95
96    flags |= KDC_OPT_FORWARDED;
97
98    if (forwardable)
99	flags |= KDC_OPT_FORWARDABLE;
100
101
102    memset (&creds, 0, sizeof(creds));
103    creds.client = client;
104    creds.server = server;
105
106    ret = krb5_get_forwarded_creds (context,
107				    auth_context,
108				    ccache,
109				    flags,
110				    hostname,
111				    &creds,
112				    out_data);
113    return ret;
114}
115
116/*
117 *
118 */
119
120krb5_error_code
121krb5_get_forwarded_creds (krb5_context	    context,
122			  krb5_auth_context auth_context,
123			  krb5_ccache       ccache,
124			  krb5_flags        flags,
125			  const char        *hostname,
126			  krb5_creds        *in_creds,
127			  krb5_data         *out_data)
128{
129    krb5_error_code ret;
130    krb5_creds *out_creds;
131    krb5_addresses addrs;
132    KRB_CRED cred;
133    KrbCredInfo *krb_cred_info;
134    EncKrbCredPart enc_krb_cred_part;
135    size_t len;
136    u_char buf[1024];
137    int32_t sec, usec;
138    krb5_kdc_flags kdc_flags;
139    krb5_crypto crypto;
140    struct addrinfo *ai;
141
142    addrs.len = 0;
143    addrs.val = NULL;
144
145    ret = getaddrinfo (hostname, NULL, NULL, &ai);
146    if (ret)
147	return krb5_eai_to_heim_errno(ret);
148
149    ret = add_addrs (context, &addrs, ai);
150    freeaddrinfo (ai);
151    if (ret)
152	return ret;
153
154    kdc_flags.i = flags;
155
156    ret = krb5_get_kdc_cred (context,
157			     ccache,
158			     kdc_flags,
159			     &addrs,
160			     NULL,
161			     in_creds,
162			     &out_creds);
163    krb5_free_addresses (context, &addrs);
164    if (ret) {
165	return ret;
166    }
167
168    memset (&cred, 0, sizeof(cred));
169    cred.pvno = 5;
170    cred.msg_type = krb_cred;
171    ALLOC_SEQ(&cred.tickets, 1);
172    if (cred.tickets.val == NULL) {
173	ret = ENOMEM;
174	goto out2;
175    }
176    ret = decode_Ticket(out_creds->ticket.data,
177			out_creds->ticket.length,
178			cred.tickets.val, &len);
179    if (ret)
180	goto out3;
181
182    memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
183    ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1);
184    if (enc_krb_cred_part.ticket_info.val == NULL) {
185	ret = ENOMEM;
186	goto out4;
187    }
188
189    krb5_us_timeofday (context, &sec, &usec);
190
191    ALLOC(enc_krb_cred_part.timestamp, 1);
192    if (enc_krb_cred_part.timestamp == NULL) {
193	ret = ENOMEM;
194	goto out4;
195    }
196    *enc_krb_cred_part.timestamp = sec;
197    ALLOC(enc_krb_cred_part.usec, 1);
198    if (enc_krb_cred_part.usec == NULL) {
199 	ret = ENOMEM;
200	goto out4;
201    }
202    *enc_krb_cred_part.usec      = usec;
203
204    if (auth_context->local_address && auth_context->local_port) {
205	ret = krb5_make_addrport (&enc_krb_cred_part.s_address,
206				  auth_context->local_address,
207				  auth_context->local_port);
208	if (ret)
209	    goto out4;
210    }
211
212    if (auth_context->remote_address) {
213	ALLOC(enc_krb_cred_part.r_address, 1);
214	if (enc_krb_cred_part.r_address == NULL) {
215	    ret = ENOMEM;
216	    goto out4;
217	}
218
219	ret = krb5_copy_address (context, auth_context->remote_address,
220				 enc_krb_cred_part.r_address);
221	if (ret)
222	    goto out4;
223    }
224
225    /* fill ticket_info.val[0] */
226
227    enc_krb_cred_part.ticket_info.len = 1;
228
229    krb_cred_info = enc_krb_cred_part.ticket_info.val;
230
231    copy_EncryptionKey (&out_creds->session, &krb_cred_info->key);
232    ALLOC(krb_cred_info->prealm, 1);
233    copy_Realm (&out_creds->client->realm, krb_cred_info->prealm);
234    ALLOC(krb_cred_info->pname, 1);
235    copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname);
236    ALLOC(krb_cred_info->flags, 1);
237    *krb_cred_info->flags          = out_creds->flags.b;
238    ALLOC(krb_cred_info->authtime, 1);
239    *krb_cred_info->authtime       = out_creds->times.authtime;
240    ALLOC(krb_cred_info->starttime, 1);
241    *krb_cred_info->starttime      = out_creds->times.starttime;
242    ALLOC(krb_cred_info->endtime, 1);
243    *krb_cred_info->endtime        = out_creds->times.endtime;
244    ALLOC(krb_cred_info->renew_till, 1);
245    *krb_cred_info->renew_till = out_creds->times.renew_till;
246    ALLOC(krb_cred_info->srealm, 1);
247    copy_Realm (&out_creds->server->realm, krb_cred_info->srealm);
248    ALLOC(krb_cred_info->sname, 1);
249    copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname);
250    ALLOC(krb_cred_info->caddr, 1);
251    copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr);
252
253    krb5_free_creds (context, out_creds);
254
255    /* encode EncKrbCredPart */
256
257    ret = krb5_encode_EncKrbCredPart (context,
258				      buf + sizeof(buf) - 1, sizeof(buf),
259				      &enc_krb_cred_part, &len);
260    free_EncKrbCredPart (&enc_krb_cred_part);
261    if (ret) {
262	free_KRB_CRED(&cred);
263	return ret;
264    }
265
266    ret = krb5_crypto_init(context, auth_context->local_subkey, 0, &crypto);
267    if (ret) {
268	free_KRB_CRED(&cred);
269	return ret;
270    }
271    ret = krb5_encrypt_EncryptedData (context,
272				      crypto,
273				      KRB5_KU_KRB_CRED,
274				      buf + sizeof(buf) - len,
275				      len,
276				      0,
277				      &cred.enc_part);
278    krb5_crypto_destroy(context, crypto);
279    if (ret) {
280	free_KRB_CRED(&cred);
281	return ret;
282    }
283
284    ret = encode_KRB_CRED (buf + sizeof(buf) - 1, sizeof(buf),
285			   &cred, &len);
286    free_KRB_CRED (&cred);
287    if (ret)
288	return ret;
289    out_data->length = len;
290    out_data->data   = malloc(len);
291    if (out_data->data == NULL)
292	return ENOMEM;
293    memcpy (out_data->data, buf + sizeof(buf) - len, len);
294    return 0;
295out4:
296    free_EncKrbCredPart(&enc_krb_cred_part);
297out3:
298    free_KRB_CRED(&cred);
299out2:
300    krb5_free_creds (context, out_creds);
301    return ret;
302}
303