1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
25 */
26 /*
27 * Copyright 1990 by the Massachusetts Institute of Technology.
28 * All Rights Reserved.
29 *
30 * Export of this software from the United States of America may
31 * require a specific license from the United States Government.
32 * It is the responsibility of any person or organization contemplating
33 * export to obtain such a license before exporting.
34 *
35 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
36 * distribute this software and its documentation for any purpose and
37 * without fee is hereby granted, provided that the above copyright
38 * notice appear in all copies and that both that copyright notice and
39 * this permission notice appear in supporting documentation, and that
40 * the name of M.I.T. not be used in advertising or publicity pertaining
41 * to distribution of the software without specific, written prior
42 * permission. Furthermore if you modify this software you must label
43 * your software as modified software and not distribute it in such a
44 * fashion that it might be confused with the original M.I.T. software.
45 * M.I.T. makes no representations about the suitability of
46 * this software for any purpose. It is provided "as is" without express
47 * or implied warranty.
48 *
49 *
50 * Initialize a credentials cache.
51 */
52 #include <kerberosv5/krb5.h>
53 #include <kerberosv5/com_err.h>
54 #include <assert.h>
55 #include <stdio.h>
56 #include <syslog.h>
57 #include <errno.h>
58
59 #include <smbsrv/libsmbns.h>
60 #include <smbns_krb.h>
61
62 int
smb_kinit(char * domain_name,char * principal_name,char * principal_passwd)63 smb_kinit(char *domain_name, char *principal_name, char *principal_passwd)
64 {
65 char default_realm[MAXHOSTNAMELEN];
66 krb5_context ctx = NULL;
67 krb5_ccache cc = NULL;
68 krb5_principal me = NULL;
69 krb5_creds my_creds;
70 krb5_error_code code;
71 const char *doing = NULL;
72 smb_ads_status_t err;
73
74 assert(principal_name != NULL);
75 assert(principal_passwd != NULL);
76
77 (void) memset(&my_creds, 0, sizeof (my_creds));
78
79 /*
80 * From this point on, we can goto cleanup because the key variables
81 * are initialized.
82 */
83
84 code = krb5_init_context(&ctx);
85 if (code) {
86 err = SMB_ADS_KRB5_INIT_CTX;
87 doing = "smbns_krb: initializing context";
88 goto cleanup;
89 }
90
91 /*
92 * In case krb5.conf is not configured, set the default realm.
93 */
94 (void) strlcpy(default_realm, domain_name, sizeof (default_realm));
95 (void) smb_strupr(default_realm);
96 (void) krb5_set_default_realm(ctx, default_realm);
97
98 code = krb5_cc_default(ctx, &cc);
99 if (code != 0) {
100 err = SMB_ADS_KRB5_CC_DEFAULT;
101 doing = "smbns_krb: resolve default credentials cache";
102 goto cleanup;
103 }
104
105 /* Use specified name */
106 code = krb5_parse_name(ctx, principal_name, &me);
107 if (code != 0) {
108 err = SMB_ADS_KRB5_PARSE_PRINCIPAL;
109 doing = "smbns_krb: parsing principal name";
110 goto cleanup;
111 }
112
113 code = krb5_get_init_creds_password(ctx, &my_creds, me,
114 principal_passwd, NULL, 0, (krb5_deltat)0,
115 NULL, NULL);
116 if (code != 0) {
117 doing = "smbns_krb: getting initial credentials";
118 switch (code) {
119
120 case KRB5KRB_AP_ERR_BAD_INTEGRITY:
121 err = SMB_ADS_KRB5_GET_INIT_CREDS_PW;
122 break;
123
124 case KRB5KRB_AP_ERR_SKEW:
125 err = SMB_ADS_KRB5_GET_INIT_CREDS_SKEW;
126 break;
127
128 default:
129 err = SMB_ADS_KRB5_GET_INIT_CREDS_OTHER;
130 break;
131 }
132
133 goto cleanup;
134 }
135
136 code = krb5_cc_initialize(ctx, cc, me);
137 if (code != 0) {
138 err = SMB_ADS_KRB5_CC_INITIALIZE;
139 doing = "smbns_krb: initializing cache";
140 goto cleanup;
141 }
142
143 code = krb5_cc_store_cred(ctx, cc, &my_creds);
144 if (code != 0) {
145 err = SMB_ADS_KRB5_CC_STORE_CRED;
146 doing = "smbns_krb: storing credentials";
147 goto cleanup;
148 }
149
150 /* SUCCESS! */
151 err = SMB_ADS_SUCCESS;
152
153 cleanup:
154 if (code != 0) {
155 smb_krb5_log_errmsg(ctx, doing, code);
156 }
157
158 if (my_creds.client == me) {
159 my_creds.client = NULL;
160 }
161 krb5_free_cred_contents(ctx, &my_creds);
162
163 if (me)
164 krb5_free_principal(ctx, me);
165 if (cc)
166 (void) krb5_cc_close(ctx, cc);
167 if (ctx)
168 krb5_free_context(ctx);
169
170 return (err);
171 }
172
173 /*
174 * Invoke krb5_get_error_message() to generate a richer error message.
175 */
176 void
smb_krb5_log_errmsg(krb5_context ctx,const char * prefix,krb5_error_code code)177 smb_krb5_log_errmsg(krb5_context ctx, const char *prefix, krb5_error_code code)
178 {
179 const char *msg;
180
181 msg = krb5_get_error_message(ctx, code);
182 syslog(LOG_ERR, "%s (%s)", prefix, msg);
183 krb5_free_error_message(ctx, msg);
184 }
185
186 /*
187 * smb_ccache_init
188 *
189 * Creates the directory where the Kerberos ccache file is located
190 * and set KRB5CCNAME in the environment.
191 *
192 * Returns 0 upon succcess. Otherwise, returns
193 * -1 if it fails to create the specified directory fails.
194 * -2 if it fails to set the KRB5CCNAME environment variable.
195 */
196 int
smb_ccache_init(char * dir,char * filename)197 smb_ccache_init(char *dir, char *filename)
198 {
199 static char buf[MAXPATHLEN];
200
201 if ((mkdir(dir, 0700) < 0) && (errno != EEXIST))
202 return (-1);
203
204 (void) snprintf(buf, MAXPATHLEN, "KRB5CCNAME=%s/%s", dir, filename);
205 if (putenv(buf) != 0)
206 return (-2);
207 return (0);
208 }
209
210 void
smb_ccache_remove(char * path)211 smb_ccache_remove(char *path)
212 {
213 if ((remove(path) < 0) && (errno != ENOENT))
214 syslog(LOG_ERR, "smbns_krb: failed to remove ccache (%s)",
215 path);
216 }
217