1 /* $NetBSD: creds.c,v 1.2 2017/01/28 21:31:49 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "krb5_locl.h"
37
38 /**
39 * Free content of krb5_creds.
40 *
41 * @param context Kerberos 5 context.
42 * @param c krb5_creds to free.
43 *
44 * @return Returns 0 to indicate success. Otherwise an kerberos et
45 * error code is returned, see krb5_get_error_message().
46 *
47 * @ingroup krb5
48 */
49
50 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_free_cred_contents(krb5_context context,krb5_creds * c)51 krb5_free_cred_contents (krb5_context context, krb5_creds *c)
52 {
53 krb5_free_principal (context, c->client);
54 c->client = NULL;
55 krb5_free_principal (context, c->server);
56 c->server = NULL;
57 krb5_free_keyblock_contents (context, &c->session);
58 krb5_data_free (&c->ticket);
59 krb5_data_free (&c->second_ticket);
60 free_AuthorizationData (&c->authdata);
61 krb5_free_addresses (context, &c->addresses);
62 memset(c, 0, sizeof(*c));
63 return 0;
64 }
65
66 /**
67 * Copy content of krb5_creds.
68 *
69 * @param context Kerberos 5 context.
70 * @param incred source credential
71 * @param c destination credential, free with krb5_free_cred_contents().
72 *
73 * @return Returns 0 to indicate success. Otherwise an kerberos et
74 * error code is returned, see krb5_get_error_message().
75 *
76 * @ingroup krb5
77 */
78
79 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_creds_contents(krb5_context context,const krb5_creds * incred,krb5_creds * c)80 krb5_copy_creds_contents (krb5_context context,
81 const krb5_creds *incred,
82 krb5_creds *c)
83 {
84 krb5_error_code ret;
85
86 memset(c, 0, sizeof(*c));
87 ret = krb5_copy_principal (context, incred->client, &c->client);
88 if (ret)
89 goto fail;
90 ret = krb5_copy_principal (context, incred->server, &c->server);
91 if (ret)
92 goto fail;
93 ret = krb5_copy_keyblock_contents (context, &incred->session, &c->session);
94 if (ret)
95 goto fail;
96 c->times = incred->times;
97 ret = krb5_data_copy (&c->ticket,
98 incred->ticket.data,
99 incred->ticket.length);
100 if (ret)
101 goto fail;
102 ret = krb5_data_copy (&c->second_ticket,
103 incred->second_ticket.data,
104 incred->second_ticket.length);
105 if (ret)
106 goto fail;
107 ret = copy_AuthorizationData(&incred->authdata, &c->authdata);
108 if (ret)
109 goto fail;
110 ret = krb5_copy_addresses (context,
111 &incred->addresses,
112 &c->addresses);
113 if (ret)
114 goto fail;
115 c->flags = incred->flags;
116 return 0;
117
118 fail:
119 krb5_free_cred_contents (context, c);
120 return ret;
121 }
122
123 /**
124 * Copy krb5_creds.
125 *
126 * @param context Kerberos 5 context.
127 * @param incred source credential
128 * @param outcred destination credential, free with krb5_free_creds().
129 *
130 * @return Returns 0 to indicate success. Otherwise an kerberos et
131 * error code is returned, see krb5_get_error_message().
132 *
133 * @ingroup krb5
134 */
135
136 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_creds(krb5_context context,const krb5_creds * incred,krb5_creds ** outcred)137 krb5_copy_creds (krb5_context context,
138 const krb5_creds *incred,
139 krb5_creds **outcred)
140 {
141 krb5_creds *c;
142
143 c = calloc(1, sizeof(*c));
144 if (c == NULL)
145 return krb5_enomem(context);
146 *outcred = c;
147 return krb5_copy_creds_contents (context, incred, c);
148 }
149
150 /**
151 * Free krb5_creds.
152 *
153 * @param context Kerberos 5 context.
154 * @param c krb5_creds to free.
155 *
156 * @return Returns 0 to indicate success. Otherwise an kerberos et
157 * error code is returned, see krb5_get_error_message().
158 *
159 * @ingroup krb5
160 */
161
162 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_free_creds(krb5_context context,krb5_creds * c)163 krb5_free_creds (krb5_context context, krb5_creds *c)
164 {
165 if (c != NULL)
166 krb5_free_cred_contents(context, c);
167 free(c);
168 return 0;
169 }
170
171 /* XXX this do not belong here */
172 static krb5_boolean
krb5_times_equal(const krb5_times * a,const krb5_times * b)173 krb5_times_equal(const krb5_times *a, const krb5_times *b)
174 {
175 return a->starttime == b->starttime &&
176 a->authtime == b->authtime &&
177 a->endtime == b->endtime &&
178 a->renew_till == b->renew_till;
179 }
180
181 /**
182 * Return TRUE if `mcreds' and `creds' are equal (`whichfields'
183 * determines what equal means).
184 *
185 *
186 * The following flags, set in whichfields affects the comparison:
187 * - KRB5_TC_MATCH_SRV_NAMEONLY Consider all realms equal when comparing the service principal.
188 * - KRB5_TC_MATCH_KEYTYPE Compare enctypes.
189 * - KRB5_TC_MATCH_FLAGS_EXACT Make sure that the ticket flags are identical.
190 * - KRB5_TC_MATCH_FLAGS Make sure that all ticket flags set in mcreds are also present in creds .
191 * - KRB5_TC_MATCH_TIMES_EXACT Compares the ticket times exactly.
192 * - KRB5_TC_MATCH_TIMES Compares only the expiration times of the creds.
193 * - KRB5_TC_MATCH_AUTHDATA Compares the authdata fields.
194 * - KRB5_TC_MATCH_2ND_TKT Compares the second tickets (used by user-to-user authentication).
195 * - KRB5_TC_MATCH_IS_SKEY Compares the existance of the second ticket.
196 *
197 * @param context Kerberos 5 context.
198 * @param whichfields which fields to compare.
199 * @param mcreds cred to compare with.
200 * @param creds cred to compare with.
201 *
202 * @return return TRUE if mcred and creds are equal, FALSE if not.
203 *
204 * @ingroup krb5
205 */
206
207 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
krb5_compare_creds(krb5_context context,krb5_flags whichfields,const krb5_creds * mcreds,const krb5_creds * creds)208 krb5_compare_creds(krb5_context context, krb5_flags whichfields,
209 const krb5_creds * mcreds, const krb5_creds * creds)
210 {
211 krb5_boolean match = TRUE;
212
213 if (match && mcreds->server) {
214 if (whichfields & (KRB5_TC_DONT_MATCH_REALM | KRB5_TC_MATCH_SRV_NAMEONLY))
215 match = krb5_principal_compare_any_realm (context, mcreds->server,
216 creds->server);
217 else
218 match = krb5_principal_compare (context, mcreds->server,
219 creds->server);
220 }
221
222 if (match && mcreds->client) {
223 if(whichfields & KRB5_TC_DONT_MATCH_REALM)
224 match = krb5_principal_compare_any_realm (context, mcreds->client,
225 creds->client);
226 else
227 match = krb5_principal_compare (context, mcreds->client,
228 creds->client);
229 }
230
231 if (match && (whichfields & KRB5_TC_MATCH_KEYTYPE))
232 match = mcreds->session.keytype == creds->session.keytype;
233
234 if (match && (whichfields & KRB5_TC_MATCH_FLAGS_EXACT))
235 match = mcreds->flags.i == creds->flags.i;
236
237 if (match && (whichfields & KRB5_TC_MATCH_FLAGS))
238 match = (creds->flags.i & mcreds->flags.i) == mcreds->flags.i;
239
240 if (match && (whichfields & KRB5_TC_MATCH_TIMES_EXACT))
241 match = krb5_times_equal(&mcreds->times, &creds->times);
242
243 if (match && (whichfields & KRB5_TC_MATCH_TIMES))
244 /* compare only expiration times */
245 match = (mcreds->times.renew_till <= creds->times.renew_till) &&
246 (mcreds->times.endtime <= creds->times.endtime);
247
248 if (match && (whichfields & KRB5_TC_MATCH_AUTHDATA)) {
249 unsigned int i;
250 if(mcreds->authdata.len != creds->authdata.len)
251 match = FALSE;
252 else
253 for(i = 0; match && i < mcreds->authdata.len; i++)
254 match = (mcreds->authdata.val[i].ad_type ==
255 creds->authdata.val[i].ad_type) &&
256 (krb5_data_cmp(&mcreds->authdata.val[i].ad_data,
257 &creds->authdata.val[i].ad_data) == 0);
258 }
259 if (match && (whichfields & KRB5_TC_MATCH_2ND_TKT))
260 match = (krb5_data_cmp(&mcreds->second_ticket, &creds->second_ticket) == 0);
261
262 if (match && (whichfields & KRB5_TC_MATCH_IS_SKEY))
263 match = ((mcreds->second_ticket.length == 0) ==
264 (creds->second_ticket.length == 0));
265
266 return match;
267 }
268
269 /**
270 * Returns the ticket flags for the credentials in creds.
271 * See also krb5_ticket_get_flags().
272 *
273 * @param creds credential to get ticket flags from
274 *
275 * @return ticket flags
276 *
277 * @ingroup krb5
278 */
279
280 KRB5_LIB_FUNCTION unsigned long KRB5_LIB_CALL
krb5_creds_get_ticket_flags(krb5_creds * creds)281 krb5_creds_get_ticket_flags(krb5_creds *creds)
282 {
283 return TicketFlags2int(creds->flags.b);
284 }
285