verify_user.c revision 272461 
1/*
2 * Copyright (c) 1997-2004 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
36static krb5_error_code
37verify_common (krb5_context context,
38	       krb5_principal principal,
39	       krb5_ccache ccache,
40	       krb5_keytab keytab,
41	       krb5_boolean secure,
42	       const char *service,
43	       krb5_creds cred)
44{
45    krb5_error_code ret;
46    krb5_principal server;
47    krb5_verify_init_creds_opt vopt;
48    krb5_ccache id;
49
50    ret = krb5_sname_to_principal (context, NULL, service, KRB5_NT_SRV_HST,
51				   &server);
52    if(ret)
53	return ret;
54
55    krb5_verify_init_creds_opt_init(&vopt);
56    krb5_verify_init_creds_opt_set_ap_req_nofail(&vopt, secure);
57
58    ret = krb5_verify_init_creds(context,
59				 &cred,
60				 server,
61				 keytab,
62				 NULL,
63				 &vopt);
64    krb5_free_principal(context, server);
65    if(ret)
66	return ret;
67    if(ccache == NULL)
68	ret = krb5_cc_default (context, &id);
69    else
70	id = ccache;
71    if(ret == 0){
72	ret = krb5_cc_initialize(context, id, principal);
73	if(ret == 0){
74	    ret = krb5_cc_store_cred(context, id, &cred);
75	}
76	if(ccache == NULL)
77	    krb5_cc_close(context, id);
78    }
79    krb5_free_cred_contents(context, &cred);
80    return ret;
81}
82
83/*
84 * Verify user `principal' with `password'.
85 *
86 * If `secure', also verify against local service key for `service'.
87 *
88 * As a side effect, fresh tickets are obtained and stored in `ccache'.
89 */
90
91KRB5_LIB_FUNCTION void KRB5_LIB_CALL
92krb5_verify_opt_init(krb5_verify_opt *opt)
93{
94    memset(opt, 0, sizeof(*opt));
95    opt->secure = TRUE;
96    opt->service = "host";
97}
98
99KRB5_LIB_FUNCTION int KRB5_LIB_CALL
100krb5_verify_opt_alloc(krb5_context context, krb5_verify_opt **opt)
101{
102    *opt = calloc(1, sizeof(**opt));
103    if ((*opt) == NULL) {
104	krb5_set_error_message(context, ENOMEM,
105			       N_("malloc: out of memory", ""));
106	return ENOMEM;
107    }
108    krb5_verify_opt_init(*opt);
109    return 0;
110}
111
112KRB5_LIB_FUNCTION void KRB5_LIB_CALL
113krb5_verify_opt_free(krb5_verify_opt *opt)
114{
115    free(opt);
116}
117
118KRB5_LIB_FUNCTION void KRB5_LIB_CALL
119krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache)
120{
121    opt->ccache = ccache;
122}
123
124KRB5_LIB_FUNCTION void KRB5_LIB_CALL
125krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab)
126{
127    opt->keytab = keytab;
128}
129
130KRB5_LIB_FUNCTION void KRB5_LIB_CALL
131krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure)
132{
133    opt->secure = secure;
134}
135
136KRB5_LIB_FUNCTION void KRB5_LIB_CALL
137krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service)
138{
139    opt->service = service;
140}
141
142KRB5_LIB_FUNCTION void KRB5_LIB_CALL
143krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags)
144{
145    opt->flags |= flags;
146}
147
148static krb5_error_code
149verify_user_opt_int(krb5_context context,
150		    krb5_principal principal,
151		    const char *password,
152		    krb5_verify_opt *vopt)
153
154{
155    krb5_error_code ret;
156    krb5_get_init_creds_opt *opt;
157    krb5_creds cred;
158
159    ret = krb5_get_init_creds_opt_alloc (context, &opt);
160    if (ret)
161	return ret;
162    krb5_get_init_creds_opt_set_default_flags(context, NULL,
163					      krb5_principal_get_realm(context, principal),
164					      opt);
165    ret = krb5_get_init_creds_password (context,
166					&cred,
167					principal,
168					password,
169					krb5_prompter_posix,
170					NULL,
171					0,
172					NULL,
173					opt);
174    krb5_get_init_creds_opt_free(context, opt);
175    if(ret)
176	return ret;
177#define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D))
178    return verify_common (context, principal, OPT(ccache, NULL),
179			  OPT(keytab, NULL), vopt ? vopt->secure : TRUE,
180			  OPT(service, "host"), cred);
181#undef OPT
182}
183
184KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
185krb5_verify_user_opt(krb5_context context,
186		     krb5_principal principal,
187		     const char *password,
188		     krb5_verify_opt *opt)
189{
190    krb5_error_code ret;
191
192    if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) {
193	krb5_realm *realms, *r;
194	ret = krb5_get_default_realms (context, &realms);
195	if (ret)
196	    return ret;
197	ret = KRB5_CONFIG_NODEFREALM;
198
199	for (r = realms; *r != NULL && ret != 0; ++r) {
200	    ret = krb5_principal_set_realm(context, principal, *r);
201	    if (ret) {
202		krb5_free_host_realm (context, realms);
203		return ret;
204	    }
205
206	    ret = verify_user_opt_int(context, principal, password, opt);
207	}
208	krb5_free_host_realm (context, realms);
209	if(ret)
210	    return ret;
211    } else
212	ret = verify_user_opt_int(context, principal, password, opt);
213    return ret;
214}
215
216/* compat function that calls above */
217
218KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
219krb5_verify_user(krb5_context context,
220		 krb5_principal principal,
221		 krb5_ccache ccache,
222		 const char *password,
223		 krb5_boolean secure,
224		 const char *service)
225{
226    krb5_verify_opt opt;
227
228    krb5_verify_opt_init(&opt);
229
230    krb5_verify_opt_set_ccache(&opt, ccache);
231    krb5_verify_opt_set_secure(&opt, secure);
232    krb5_verify_opt_set_service(&opt, service);
233
234    return krb5_verify_user_opt(context, principal, password, &opt);
235}
236
237/*
238 * A variant of `krb5_verify_user'.  The realm of `principal' is
239 * ignored and all the local realms are tried.
240 */
241
242KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
243krb5_verify_user_lrealm(krb5_context context,
244			krb5_principal principal,
245			krb5_ccache ccache,
246			const char *password,
247			krb5_boolean secure,
248			const char *service)
249{
250    krb5_verify_opt opt;
251
252    krb5_verify_opt_init(&opt);
253
254    krb5_verify_opt_set_ccache(&opt, ccache);
255    krb5_verify_opt_set_secure(&opt, secure);
256    krb5_verify_opt_set_service(&opt, service);
257    krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS);
258
259    return krb5_verify_user_opt(context, principal, password, &opt);
260}
261