1/*
2 * Copyright (c) 1997-2004 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
36static krb5_error_code
37verify_common (krb5_context context,
38	       krb5_principal principal,
39	       krb5_principal server_principal,
40	       krb5_ccache ccache,
41	       krb5_keytab keytab,
42	       krb5_boolean secure,
43	       const char *service,
44	       krb5_creds *cred)
45{
46    krb5_error_code ret;
47    krb5_verify_init_creds_opt vopt;
48    krb5_ccache id;
49
50    krb5_verify_init_creds_opt_init(&vopt);
51    krb5_verify_init_creds_opt_set_ap_req_nofail(&vopt, secure);
52    krb5_verify_init_creds_opt_set_service(&vopt, service);
53
54    ret = krb5_verify_init_creds(context,
55				 cred,
56				 server_principal,
57				 keytab,
58				 NULL,
59				 &vopt);
60    if(ret)
61	return ret;
62    if(ccache == NULL)
63	ret = krb5_cc_default (context, &id);
64    else
65	id = ccache;
66    if(ret == 0){
67	ret = krb5_cc_initialize(context, id, principal);
68	if(ret == 0){
69	    ret = krb5_cc_store_cred(context, id, cred);
70	}
71	if(ccache == NULL)
72	    krb5_cc_close(context, id);
73    }
74    return ret;
75}
76
77struct krb5_verify_opt {
78    unsigned int flags;
79    krb5_ccache ccache;
80    krb5_keytab keytab;
81    krb5_boolean secure;
82    const char *service;
83    krb5_principal server;
84    krb5_prompter_fct prompter;
85    void *prompter_data;
86};
87
88/*
89 * Verify user `principal' with `password'.
90 *
91 * If `secure', also verify against local service key for `service'.
92 *
93 * As a side effect, fresh tickets are obtained and stored in `ccache'.
94 */
95
96KRB5_LIB_FUNCTION void KRB5_LIB_CALL
97krb5_verify_opt_init(krb5_verify_opt *opt)
98{
99    memset(opt, 0, sizeof(*opt));
100    opt->secure = TRUE;
101    opt->service = "host";
102    opt->prompter = krb5_prompter_posix;
103}
104
105KRB5_LIB_FUNCTION int KRB5_LIB_CALL
106krb5_verify_opt_alloc(krb5_context context, krb5_verify_opt **opt)
107{
108    *opt = calloc(1, sizeof(**opt));
109    if ((*opt) == NULL) {
110	krb5_set_error_message(context, ENOMEM,
111			       N_("malloc: out of memory", ""));
112	return ENOMEM;
113    }
114    krb5_verify_opt_init(*opt);
115    return 0;
116}
117
118KRB5_LIB_FUNCTION void KRB5_LIB_CALL
119krb5_verify_opt_free(krb5_verify_opt *opt)
120{
121    free(opt);
122}
123
124KRB5_LIB_FUNCTION void KRB5_LIB_CALL
125krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache)
126{
127    opt->ccache = ccache;
128}
129
130KRB5_LIB_FUNCTION void KRB5_LIB_CALL
131krb5_verify_opt_set_server(krb5_verify_opt *opt, krb5_principal server)
132{
133    opt->server = server;
134}
135
136KRB5_LIB_FUNCTION void KRB5_LIB_CALL
137krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab)
138{
139    opt->keytab = keytab;
140}
141
142KRB5_LIB_FUNCTION void KRB5_LIB_CALL
143krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure)
144{
145    opt->secure = secure;
146}
147
148KRB5_LIB_FUNCTION void KRB5_LIB_CALL
149krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service)
150{
151    opt->service = service;
152}
153
154KRB5_LIB_FUNCTION void KRB5_LIB_CALL
155krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags)
156{
157    opt->flags |= flags;
158}
159
160KRB5_LIB_FUNCTION void KRB5_LIB_CALL
161krb5_verify_opt_set_prompter(krb5_verify_opt *opt,
162			     krb5_prompter_fct prompter,
163			     void *prompter_data)
164{
165    opt->prompter = prompter;
166    opt->prompter_data = prompter_data;
167}
168
169
170static krb5_error_code
171verify_user_opt_int(krb5_context context,
172		    krb5_principal principal,
173		    const char *password,
174		    krb5_verify_opt *vopt)
175
176{
177    krb5_error_code ret;
178    krb5_get_init_creds_opt *opt;
179    krb5_creds cred;
180
181    memset(&cred, 0, sizeof(cred));
182
183    ret = krb5_get_init_creds_opt_alloc(context, &opt);
184    if (ret)
185	return ret;
186    krb5_get_init_creds_opt_set_default_flags(context, NULL,
187					      krb5_principal_get_realm(context, principal),
188					      opt);
189
190    ret = krb5_get_init_creds_password(context,
191				       &cred,
192				       principal,
193				       password,
194				       vopt->prompter,
195				       vopt->prompter_data,
196				       0,
197				       NULL,
198				       opt);
199    if (ret) {
200	krb5_get_init_creds_opt_free(context, opt);
201	return ret;
202    }
203#define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D))
204    ret = verify_common(context, principal, OPT(server, NULL),
205			OPT(ccache, NULL),
206			OPT(keytab, NULL),
207			vopt ? vopt->secure : TRUE,
208			OPT(service, "host"), &cred);
209#undef OPT
210    krb5_free_cred_contents(context, &cred);
211    krb5_get_init_creds_opt_free(context, opt);
212    return ret;
213}
214
215KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
216krb5_verify_user_opt(krb5_context context,
217		     krb5_principal principal,
218		     const char *password,
219		     krb5_verify_opt *opt)
220{
221    krb5_error_code ret;
222
223    if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) {
224	krb5_realm *realms, *r;
225	ret = krb5_get_default_realms (context, &realms);
226	if (ret)
227	    return ret;
228	ret = KRB5_CONFIG_NODEFREALM;
229
230	for (r = realms; *r != NULL && ret != 0; ++r) {
231	    ret = krb5_principal_set_realm(context, principal, *r);
232	    if (ret) {
233		krb5_free_host_realm (context, realms);
234		return ret;
235	    }
236
237	    ret = verify_user_opt_int(context, principal, password, opt);
238	}
239	krb5_free_host_realm (context, realms);
240	if(ret)
241	    return ret;
242    } else
243	ret = verify_user_opt_int(context, principal, password, opt);
244    return ret;
245}
246
247/* compat function that calls above */
248
249KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
250krb5_verify_user(krb5_context context,
251		 krb5_principal principal,
252		 krb5_ccache ccache,
253		 const char *password,
254		 krb5_boolean secure,
255		 const char *service)
256{
257    krb5_verify_opt opt;
258
259    krb5_verify_opt_init(&opt);
260
261    krb5_verify_opt_set_ccache(&opt, ccache);
262    krb5_verify_opt_set_secure(&opt, secure);
263    krb5_verify_opt_set_service(&opt, service);
264
265    return krb5_verify_user_opt(context, principal, password, &opt);
266}
267
268/*
269 * A variant of `krb5_verify_user'.  The realm of `principal' is
270 * ignored and all the local realms are tried.
271 */
272
273KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
274krb5_verify_user_lrealm(krb5_context context,
275			krb5_principal principal,
276			krb5_ccache ccache,
277			const char *password,
278			krb5_boolean secure,
279			const char *service)
280{
281    krb5_verify_opt opt;
282
283    krb5_verify_opt_init(&opt);
284
285    krb5_verify_opt_set_ccache(&opt, ccache);
286    krb5_verify_opt_set_secure(&opt, secure);
287    krb5_verify_opt_set_service(&opt, service);
288    krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS);
289
290    return krb5_verify_user_opt(context, principal, password, &opt);
291}
292