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 *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 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 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 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