1 /* $NetBSD: verify_user.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $ */
2
3 /*
4 * Copyright (c) 1997-2004 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 static krb5_error_code
verify_common(krb5_context context,krb5_principal principal,krb5_ccache ccache,krb5_keytab keytab,krb5_boolean secure,const char * service,krb5_creds cred)39 verify_common (krb5_context context,
40 krb5_principal principal,
41 krb5_ccache ccache,
42 krb5_keytab keytab,
43 krb5_boolean secure,
44 const char *service,
45 krb5_creds cred)
46 {
47 krb5_error_code ret;
48 krb5_principal server;
49 krb5_verify_init_creds_opt vopt;
50 krb5_ccache id;
51
52 ret = krb5_sname_to_principal (context, NULL, service, KRB5_NT_SRV_HST,
53 &server);
54 if(ret)
55 return ret;
56
57 krb5_verify_init_creds_opt_init(&vopt);
58 krb5_verify_init_creds_opt_set_ap_req_nofail(&vopt, secure);
59
60 ret = krb5_verify_init_creds(context,
61 &cred,
62 server,
63 keytab,
64 NULL,
65 &vopt);
66 krb5_free_principal(context, server);
67 if(ret)
68 return ret;
69 if(ccache == NULL)
70 ret = krb5_cc_default (context, &id);
71 else
72 id = ccache;
73 if(ret == 0){
74 ret = krb5_cc_initialize(context, id, principal);
75 if(ret == 0){
76 ret = krb5_cc_store_cred(context, id, &cred);
77 }
78 if(ccache == NULL)
79 krb5_cc_close(context, id);
80 }
81 krb5_free_cred_contents(context, &cred);
82 return ret;
83 }
84
85 /*
86 * Verify user `principal' with `password'.
87 *
88 * If `secure', also verify against local service key for `service'.
89 *
90 * As a side effect, fresh tickets are obtained and stored in `ccache'.
91 */
92
93 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_init(krb5_verify_opt * opt)94 krb5_verify_opt_init(krb5_verify_opt *opt)
95 {
96 memset(opt, 0, sizeof(*opt));
97 opt->secure = TRUE;
98 opt->service = "host";
99 }
100
101 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
krb5_verify_opt_alloc(krb5_context context,krb5_verify_opt ** opt)102 krb5_verify_opt_alloc(krb5_context context, krb5_verify_opt **opt)
103 {
104 *opt = calloc(1, sizeof(**opt));
105 if ((*opt) == NULL) {
106 krb5_set_error_message(context, ENOMEM,
107 N_("malloc: out of memory", ""));
108 return ENOMEM;
109 }
110 krb5_verify_opt_init(*opt);
111 return 0;
112 }
113
114 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_free(krb5_verify_opt * opt)115 krb5_verify_opt_free(krb5_verify_opt *opt)
116 {
117 free(opt);
118 }
119
120 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_ccache(krb5_verify_opt * opt,krb5_ccache ccache)121 krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache)
122 {
123 opt->ccache = ccache;
124 }
125
126 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_keytab(krb5_verify_opt * opt,krb5_keytab keytab)127 krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab)
128 {
129 opt->keytab = keytab;
130 }
131
132 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_secure(krb5_verify_opt * opt,krb5_boolean secure)133 krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure)
134 {
135 opt->secure = secure;
136 }
137
138 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_service(krb5_verify_opt * opt,const char * service)139 krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service)
140 {
141 opt->service = service;
142 }
143
144 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_flags(krb5_verify_opt * opt,unsigned int flags)145 krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags)
146 {
147 opt->flags |= flags;
148 }
149
150 static krb5_error_code
verify_user_opt_int(krb5_context context,krb5_principal principal,const char * password,krb5_verify_opt * vopt)151 verify_user_opt_int(krb5_context context,
152 krb5_principal principal,
153 const char *password,
154 krb5_verify_opt *vopt)
155
156 {
157 krb5_error_code ret;
158 krb5_get_init_creds_opt *opt;
159 krb5_creds cred;
160
161 ret = krb5_get_init_creds_opt_alloc (context, &opt);
162 if (ret)
163 return ret;
164 krb5_get_init_creds_opt_set_default_flags(context, NULL,
165 krb5_principal_get_realm(context, principal),
166 opt);
167 ret = krb5_get_init_creds_password (context,
168 &cred,
169 principal,
170 password,
171 krb5_prompter_posix,
172 NULL,
173 0,
174 NULL,
175 opt);
176 krb5_get_init_creds_opt_free(context, opt);
177 if(ret)
178 return ret;
179 #define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D))
180 return verify_common (context, principal, OPT(ccache, NULL),
181 OPT(keytab, NULL), vopt ? vopt->secure : TRUE,
182 OPT(service, "host"), cred);
183 #undef OPT
184 }
185
186 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_verify_user_opt(krb5_context context,krb5_principal principal,const char * password,krb5_verify_opt * opt)187 krb5_verify_user_opt(krb5_context context,
188 krb5_principal principal,
189 const char *password,
190 krb5_verify_opt *opt)
191 {
192 krb5_error_code ret;
193
194 if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) {
195 krb5_realm *realms, *r;
196 ret = krb5_get_default_realms (context, &realms);
197 if (ret)
198 return ret;
199 ret = KRB5_CONFIG_NODEFREALM;
200
201 for (r = realms; *r != NULL && ret != 0; ++r) {
202 ret = krb5_principal_set_realm(context, principal, *r);
203 if (ret) {
204 krb5_free_host_realm (context, realms);
205 return ret;
206 }
207
208 ret = verify_user_opt_int(context, principal, password, opt);
209 }
210 krb5_free_host_realm (context, realms);
211 if(ret)
212 return ret;
213 } else
214 ret = verify_user_opt_int(context, principal, password, opt);
215 return ret;
216 }
217
218 /* compat function that calls above */
219
220 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_verify_user(krb5_context context,krb5_principal principal,krb5_ccache ccache,const char * password,krb5_boolean secure,const char * service)221 krb5_verify_user(krb5_context context,
222 krb5_principal principal,
223 krb5_ccache ccache,
224 const char *password,
225 krb5_boolean secure,
226 const char *service)
227 {
228 krb5_verify_opt opt;
229
230 krb5_verify_opt_init(&opt);
231
232 krb5_verify_opt_set_ccache(&opt, ccache);
233 krb5_verify_opt_set_secure(&opt, secure);
234 krb5_verify_opt_set_service(&opt, service);
235
236 return krb5_verify_user_opt(context, principal, password, &opt);
237 }
238
239 /*
240 * A variant of `krb5_verify_user'. The realm of `principal' is
241 * ignored and all the local realms are tried.
242 */
243
244 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_verify_user_lrealm(krb5_context context,krb5_principal principal,krb5_ccache ccache,const char * password,krb5_boolean secure,const char * service)245 krb5_verify_user_lrealm(krb5_context context,
246 krb5_principal principal,
247 krb5_ccache ccache,
248 const char *password,
249 krb5_boolean secure,
250 const char *service)
251 {
252 krb5_verify_opt opt;
253
254 krb5_verify_opt_init(&opt);
255
256 krb5_verify_opt_set_ccache(&opt, ccache);
257 krb5_verify_opt_set_secure(&opt, secure);
258 krb5_verify_opt_set_service(&opt, service);
259 krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS);
260
261 return krb5_verify_user_opt(context, principal, password, &opt);
262 }
263