1 /* $NetBSD: verify_user.c,v 1.2 2017/01/28 21:31:49 christos 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 return krb5_enomem(context);
107 krb5_verify_opt_init(*opt);
108 return 0;
109 }
110
111 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_free(krb5_verify_opt * opt)112 krb5_verify_opt_free(krb5_verify_opt *opt)
113 {
114 free(opt);
115 }
116
117 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_ccache(krb5_verify_opt * opt,krb5_ccache ccache)118 krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache)
119 {
120 opt->ccache = ccache;
121 }
122
123 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_keytab(krb5_verify_opt * opt,krb5_keytab keytab)124 krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab)
125 {
126 opt->keytab = keytab;
127 }
128
129 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_secure(krb5_verify_opt * opt,krb5_boolean secure)130 krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure)
131 {
132 opt->secure = secure;
133 }
134
135 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_service(krb5_verify_opt * opt,const char * service)136 krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service)
137 {
138 opt->service = service;
139 }
140
141 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_verify_opt_set_flags(krb5_verify_opt * opt,unsigned int flags)142 krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags)
143 {
144 opt->flags |= flags;
145 }
146
147 static krb5_error_code
verify_user_opt_int(krb5_context context,krb5_principal principal,const char * password,krb5_verify_opt * vopt)148 verify_user_opt_int(krb5_context context,
149 krb5_principal principal,
150 const char *password,
151 krb5_verify_opt *vopt)
152
153 {
154 krb5_error_code ret;
155 krb5_get_init_creds_opt *opt;
156 krb5_creds cred;
157
158 ret = krb5_get_init_creds_opt_alloc (context, &opt);
159 if (ret)
160 return ret;
161 krb5_get_init_creds_opt_set_default_flags(context, NULL,
162 krb5_principal_get_realm(context, principal),
163 opt);
164 ret = krb5_get_init_creds_password (context,
165 &cred,
166 principal,
167 password,
168 krb5_prompter_posix,
169 NULL,
170 0,
171 NULL,
172 opt);
173 krb5_get_init_creds_opt_free(context, opt);
174 if(ret)
175 return ret;
176 #define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D))
177 return verify_common (context, principal, OPT(ccache, NULL),
178 OPT(keytab, NULL), vopt ? vopt->secure : TRUE,
179 OPT(service, "host"), cred);
180 #undef OPT
181 }
182
183 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)184 krb5_verify_user_opt(krb5_context context,
185 krb5_principal principal,
186 const char *password,
187 krb5_verify_opt *opt)
188 {
189 krb5_error_code ret;
190
191 if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) {
192 krb5_realm *realms, *r;
193 ret = krb5_get_default_realms (context, &realms);
194 if (ret)
195 return ret;
196 ret = KRB5_CONFIG_NODEFREALM;
197
198 for (r = realms; *r != NULL && ret != 0; ++r) {
199 ret = krb5_principal_set_realm(context, principal, *r);
200 if (ret) {
201 krb5_free_host_realm (context, realms);
202 return ret;
203 }
204
205 ret = verify_user_opt_int(context, principal, password, opt);
206 }
207 krb5_free_host_realm (context, realms);
208 if(ret)
209 return ret;
210 } else
211 ret = verify_user_opt_int(context, principal, password, opt);
212 return ret;
213 }
214
215 /* compat function that calls above */
216
217 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)218 krb5_verify_user(krb5_context context,
219 krb5_principal principal,
220 krb5_ccache ccache,
221 const char *password,
222 krb5_boolean secure,
223 const char *service)
224 {
225 krb5_verify_opt opt;
226
227 krb5_verify_opt_init(&opt);
228
229 krb5_verify_opt_set_ccache(&opt, ccache);
230 krb5_verify_opt_set_secure(&opt, secure);
231 krb5_verify_opt_set_service(&opt, service);
232
233 return krb5_verify_user_opt(context, principal, password, &opt);
234 }
235
236 /*
237 * A variant of `krb5_verify_user'. The realm of `principal' is
238 * ignored and all the local realms are tried.
239 */
240
241 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)242 krb5_verify_user_lrealm(krb5_context context,
243 krb5_principal principal,
244 krb5_ccache ccache,
245 const char *password,
246 krb5_boolean secure,
247 const char *service)
248 {
249 krb5_verify_opt opt;
250
251 krb5_verify_opt_init(&opt);
252
253 krb5_verify_opt_set_ccache(&opt, ccache);
254 krb5_verify_opt_set_secure(&opt, secure);
255 krb5_verify_opt_set_service(&opt, service);
256 krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS);
257
258 return krb5_verify_user_opt(context, principal, password, &opt);
259 }
260