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 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 *errmsg = NULL; 72 const char *doing = NULL; 73 smb_ads_status_t err; 74 75 assert(principal_name != NULL); 76 assert(principal_passwd != NULL); 77 78 (void) memset(&my_creds, 0, sizeof (my_creds)); 79 80 /* 81 * From this point on, we can goto cleanup because the key variables 82 * are initialized. 83 */ 84 85 code = krb5_init_context(&ctx); 86 if (code) { 87 err = SMB_ADS_KRB5_INIT_CTX; 88 doing = "smbns_krb: initializing context"; 89 goto cleanup; 90 } 91 92 /* 93 * In case krb5.conf is not configured, set the default realm. 94 */ 95 (void) strlcpy(default_realm, domain_name, sizeof (default_realm)); 96 (void) smb_strupr(default_realm); 97 (void) krb5_set_default_realm(ctx, default_realm); 98 99 code = krb5_cc_default(ctx, &cc); 100 if (code != 0) { 101 err = SMB_ADS_KRB5_CC_DEFAULT; 102 doing = "smbns_krb: resolve default credentials cache"; 103 goto cleanup; 104 } 105 106 /* Use specified name */ 107 code = krb5_parse_name(ctx, principal_name, &me); 108 if (code != 0) { 109 err = SMB_ADS_KRB5_PARSE_PRINCIPAL; 110 doing = "smbns_krb: parsing principal name"; 111 goto cleanup; 112 } 113 114 code = krb5_get_init_creds_password(ctx, &my_creds, me, 115 principal_passwd, NULL, 0, (krb5_deltat)0, 116 NULL, NULL); 117 if (code != 0) { 118 err = SMB_ADS_KRB5_GET_INIT_CREDS_PW; 119 doing = "smbns_krb: getting initial credentials"; 120 121 if (code == KRB5KRB_AP_ERR_BAD_INTEGRITY) { 122 errmsg = "smbns_krb: Password incorrect"; 123 } 124 125 goto cleanup; 126 } 127 128 code = krb5_cc_initialize(ctx, cc, me); 129 if (code != 0) { 130 err = SMB_ADS_KRB5_CC_INITIALIZE; 131 doing = "smbns_krb: initializing cache"; 132 goto cleanup; 133 } 134 135 code = krb5_cc_store_cred(ctx, cc, &my_creds); 136 if (code != 0) { 137 err = SMB_ADS_KRB5_CC_STORE_CRED; 138 doing = "smbns_krb: storing credentials"; 139 goto cleanup; 140 } 141 142 /* SUCCESS! */ 143 err = SMB_ADS_SUCCESS; 144 145 cleanup: 146 if (code != 0) { 147 if (errmsg == NULL) 148 smb_krb5_log_errmsg(ctx, doing, code); 149 else 150 syslog(LOG_ERR, "%s (%s)", doing, errmsg); 151 } 152 153 if (my_creds.client == me) { 154 my_creds.client = NULL; 155 } 156 krb5_free_cred_contents(ctx, &my_creds); 157 158 if (me) 159 krb5_free_principal(ctx, me); 160 if (cc) 161 (void) krb5_cc_close(ctx, cc); 162 if (ctx) 163 krb5_free_context(ctx); 164 165 return (err); 166 } 167 168 /* 169 * Invoke krb5_get_error_message() to generate a richer error message. 170 */ 171 void 172 smb_krb5_log_errmsg(krb5_context ctx, const char *prefix, krb5_error_code code) 173 { 174 const char *msg; 175 176 msg = krb5_get_error_message(ctx, code); 177 syslog(LOG_ERR, "%s (%s)", prefix, msg); 178 krb5_free_error_message(ctx, msg); 179 } 180 181 /* 182 * smb_ccache_init 183 * 184 * Creates the directory where the Kerberos ccache file is located 185 * and set KRB5CCNAME in the environment. 186 * 187 * Returns 0 upon succcess. Otherwise, returns 188 * -1 if it fails to create the specified directory fails. 189 * -2 if it fails to set the KRB5CCNAME environment variable. 190 */ 191 int 192 smb_ccache_init(char *dir, char *filename) 193 { 194 static char buf[MAXPATHLEN]; 195 196 if ((mkdir(dir, 0700) < 0) && (errno != EEXIST)) 197 return (-1); 198 199 (void) snprintf(buf, MAXPATHLEN, "KRB5CCNAME=%s/%s", dir, filename); 200 if (putenv(buf) != 0) 201 return (-2); 202 return (0); 203 } 204 205 void 206 smb_ccache_remove(char *path) 207 { 208 if ((remove(path) < 0) && (errno != ENOENT)) 209 syslog(LOG_ERR, "smbns_krb: failed to remove ccache (%s)", 210 path); 211 } 212