1/*
2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
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
36/**
37 * Free content of krb5_creds.
38 *
39 * @param context Kerberos 5 context.
40 * @param c krb5_creds to free.
41 *
42 * @return Returns 0 to indicate success. Otherwise an kerberos et
43 * error code is returned, see krb5_get_error_message().
44 *
45 * @ingroup krb5
46 */
47
48KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
49krb5_free_cred_contents (krb5_context context, krb5_creds *c)
50{
51    krb5_free_principal (context, c->client);
52    c->client = NULL;
53    krb5_free_principal (context, c->server);
54    c->server = NULL;
55    krb5_free_keyblock_contents (context, &c->session);
56    krb5_data_free (&c->ticket);
57    krb5_data_free (&c->second_ticket);
58    free_AuthorizationData (&c->authdata);
59    krb5_free_addresses (context, &c->addresses);
60    memset(c, 0, sizeof(*c));
61    return 0;
62}
63
64/**
65 * Copy content of krb5_creds.
66 *
67 * @param context Kerberos 5 context.
68 * @param incred source credential
69 * @param c destination credential, free with krb5_free_cred_contents().
70 *
71 * @return Returns 0 to indicate success. Otherwise an kerberos et
72 * error code is returned, see krb5_get_error_message().
73 *
74 * @ingroup krb5
75 */
76
77KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
78krb5_copy_creds_contents (krb5_context context,
79			  const krb5_creds *incred,
80			  krb5_creds *c)
81{
82    krb5_error_code ret;
83
84    memset(c, 0, sizeof(*c));
85    ret = krb5_copy_principal (context, incred->client, &c->client);
86    if (ret)
87	goto fail;
88    ret = krb5_copy_principal (context, incred->server, &c->server);
89    if (ret)
90	goto fail;
91    ret = krb5_copy_keyblock_contents (context, &incred->session, &c->session);
92    if (ret)
93	goto fail;
94    c->times = incred->times;
95    ret = krb5_data_copy (&c->ticket,
96			  incred->ticket.data,
97			  incred->ticket.length);
98    if (ret)
99	goto fail;
100    ret = krb5_data_copy (&c->second_ticket,
101			  incred->second_ticket.data,
102			  incred->second_ticket.length);
103    if (ret)
104	goto fail;
105    ret = copy_AuthorizationData(&incred->authdata, &c->authdata);
106    if (ret)
107	goto fail;
108    ret = krb5_copy_addresses (context,
109			       &incred->addresses,
110			       &c->addresses);
111    if (ret)
112	goto fail;
113    c->flags = incred->flags;
114    return 0;
115
116fail:
117    krb5_free_cred_contents (context, c);
118    return ret;
119}
120
121/**
122 * Copy krb5_creds.
123 *
124 * @param context Kerberos 5 context.
125 * @param incred source credential
126 * @param outcred destination credential, free with krb5_free_creds().
127 *
128 * @return Returns 0 to indicate success. Otherwise an kerberos et
129 * error code is returned, see krb5_get_error_message().
130 *
131 * @ingroup krb5
132 */
133
134KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
135krb5_copy_creds (krb5_context context,
136		 const krb5_creds *incred,
137		 krb5_creds **outcred)
138{
139    krb5_creds *c;
140
141    c = malloc (sizeof (*c));
142    if (c == NULL) {
143	krb5_set_error_message (context, ENOMEM,
144				N_("malloc: out of memory", ""));
145	return ENOMEM;
146    }
147    memset (c, 0, sizeof(*c));
148    *outcred = c;
149    return krb5_copy_creds_contents (context, incred, c);
150}
151
152/**
153 * Free krb5_creds.
154 *
155 * @param context Kerberos 5 context.
156 * @param c krb5_creds to free.
157 *
158 * @return Returns 0 to indicate success. Otherwise an kerberos et
159 * error code is returned, see krb5_get_error_message().
160 *
161 * @ingroup krb5
162 */
163
164KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
165krb5_free_creds (krb5_context context, krb5_creds *c)
166{
167    krb5_free_cred_contents (context, c);
168    free (c);
169    return 0;
170}
171
172/* XXX this do not belong here */
173static krb5_boolean
174krb5_times_equal(const krb5_times *a, const krb5_times *b)
175{
176    return a->starttime == b->starttime &&
177	a->authtime == b->authtime &&
178	a->endtime == b->endtime &&
179	a->renew_till == b->renew_till;
180}
181
182/**
183 * Return TRUE if `mcreds' and `creds' are equal (`whichfields'
184 * determines what equal means).
185 *
186 *
187 * The following flags, set in whichfields affects the comparison:
188 * - KRB5_TC_MATCH_SRV_NAMEONLY Consider all realms equal when comparing the service principal.
189 * - KRB5_TC_MATCH_KEYTYPE Compare enctypes.
190 * - KRB5_TC_MATCH_FLAGS_EXACT Make sure that the ticket flags are identical.
191 * - KRB5_TC_MATCH_FLAGS Make sure that all ticket flags set in mcreds are also present in creds .
192 * - KRB5_TC_MATCH_TIMES_EXACT Compares the ticket times exactly.
193 * - KRB5_TC_MATCH_TIMES Compares only the expiration times of the creds.
194 * - KRB5_TC_MATCH_AUTHDATA Compares the authdata fields.
195 * - KRB5_TC_MATCH_2ND_TKT Compares the second tickets (used by user-to-user authentication).
196 * - KRB5_TC_MATCH_IS_SKEY Compares the existance of the second ticket.
197 *
198 * @param context Kerberos 5 context.
199 * @param whichfields which fields to compare.
200 * @param mcreds cred to compare with.
201 * @param creds cred to compare with.
202 *
203 * @return return TRUE if mcred and creds are equal, FALSE if not.
204 *
205 * @ingroup krb5
206 */
207
208KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
209krb5_compare_creds(krb5_context context, krb5_flags whichfields,
210		   const krb5_creds * mcreds, const krb5_creds * creds)
211{
212    krb5_boolean match = TRUE;
213
214    if (match && mcreds->server) {
215	if (whichfields & (KRB5_TC_DONT_MATCH_REALM | KRB5_TC_MATCH_SRV_NAMEONLY))
216	    match = krb5_principal_compare_any_realm (context, mcreds->server,
217						      creds->server);
218	else
219	    match = krb5_principal_compare (context, mcreds->server,
220					    creds->server);
221    }
222
223    if (match && mcreds->client) {
224	if(whichfields & KRB5_TC_DONT_MATCH_REALM)
225	    match = krb5_principal_compare_any_realm (context, mcreds->client,
226						      creds->client);
227	else
228	    match = krb5_principal_compare (context, mcreds->client,
229					    creds->client);
230    }
231
232    if (match && (whichfields & KRB5_TC_MATCH_KEYTYPE))
233        match = mcreds->session.keytype == creds->session.keytype;
234
235    if (match && (whichfields & KRB5_TC_MATCH_FLAGS_EXACT))
236	match = mcreds->flags.i == creds->flags.i;
237
238    if (match && (whichfields & KRB5_TC_MATCH_FLAGS))
239	match = (creds->flags.i & mcreds->flags.i) == mcreds->flags.i;
240
241    if (match && (whichfields & KRB5_TC_MATCH_TIMES_EXACT))
242	match = krb5_times_equal(&mcreds->times, &creds->times);
243
244    if (match && (whichfields & KRB5_TC_MATCH_TIMES))
245	/* compare only expiration times */
246	match = (mcreds->times.renew_till <= creds->times.renew_till) &&
247	    (mcreds->times.endtime <= creds->times.endtime);
248
249    if (match && (whichfields & KRB5_TC_MATCH_AUTHDATA)) {
250	unsigned int i;
251	if(mcreds->authdata.len != creds->authdata.len)
252	    match = FALSE;
253	else
254	    for(i = 0; match && i < mcreds->authdata.len; i++)
255		match = (mcreds->authdata.val[i].ad_type ==
256			 creds->authdata.val[i].ad_type) &&
257		    (krb5_data_cmp(&mcreds->authdata.val[i].ad_data,
258				   &creds->authdata.val[i].ad_data) == 0);
259    }
260    if (match && (whichfields & KRB5_TC_MATCH_2ND_TKT))
261	match = (krb5_data_cmp(&mcreds->second_ticket, &creds->second_ticket) == 0);
262
263    if (match && (whichfields & KRB5_TC_MATCH_IS_SKEY))
264	match = ((mcreds->second_ticket.length == 0) ==
265		 (creds->second_ticket.length == 0));
266
267    return match;
268}
269
270/**
271 * Returns the ticket flags for the credentials in creds.
272 * See also krb5_ticket_get_flags().
273 *
274 * @param creds credential to get ticket flags from
275 *
276 * @return ticket flags
277 *
278 * @ingroup krb5
279 */
280
281KRB5_LIB_FUNCTION unsigned long KRB5_LIB_CALL
282krb5_creds_get_ticket_flags(krb5_creds *creds)
283{
284    return TicketFlags2int(creds->flags.b);
285}
286