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 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <strings.h> 33 #include <unistd.h> 34 #include <ctype.h> 35 #include <errno.h> 36 #include <syslog.h> 37 #include <kerberosv5/krb5.h> 38 #include <kerberosv5/com_err.h> 39 #include <smbns_krb.h> 40 41 static int smb_krb5_open_wrfile(krb5_context ctx, char *fname, 42 krb5_keytab *kt); 43 static int smb_krb5_ktadd(krb5_context ctx, krb5_keytab kt, 44 const krb5_principal princ, krb5_enctype enctype, krb5_kvno kvno, 45 const char *pw); 46 static krb5_error_code smb_krb5_ktremove(krb5_context ctx, krb5_keytab kt, 47 const krb5_principal princ); 48 49 50 /* 51 * smb_krb5_ctx_init 52 * 53 * Initialize the kerberos context. 54 * Return 0 on success. Otherwise, return -1. 55 */ 56 int 57 smb_krb5_ctx_init(krb5_context *ctx) 58 { 59 if (krb5_init_context(ctx) != 0) 60 return (-1); 61 62 return (0); 63 } 64 65 /* 66 * smb_krb5_get_principal 67 * 68 * Setup the krb5_principal given the host principal in string format. 69 * Return 0 on success. Otherwise, return -1. 70 */ 71 int 72 smb_krb5_get_principal(krb5_context ctx, char *princ_str, krb5_principal *princ) 73 { 74 if (krb5_parse_name(ctx, princ_str, princ) != 0) 75 return (-1); 76 77 return (0); 78 } 79 80 /* 81 * smb_krb5_ctx_fini 82 * 83 * Free the kerberos context. 84 */ 85 void 86 smb_krb5_ctx_fini(krb5_context ctx) 87 { 88 krb5_free_context(ctx); 89 } 90 91 /* 92 * smb_ksetpw 93 * 94 * Set the workstation trust account password. 95 * Returns 0 on success. Otherwise, returns non-zero value. 96 */ 97 int 98 smb_krb5_setpwd(krb5_context ctx, krb5_principal princ, char *passwd) 99 { 100 krb5_error_code code; 101 krb5_ccache cc = NULL; 102 int result_code; 103 krb5_data result_code_string, result_string; 104 105 (void) memset(&result_code_string, 0, sizeof (result_code_string)); 106 (void) memset(&result_string, 0, sizeof (result_string)); 107 108 if ((code = krb5_cc_default(ctx, &cc)) != 0) { 109 syslog(LOG_ERR, "smb_krb5_setpwd: failed to find a ccache\n"); 110 return (-1); 111 } 112 113 code = krb5_set_password_using_ccache(ctx, cc, passwd, princ, 114 &result_code, &result_code_string, &result_string); 115 116 krb5_cc_close(ctx, cc); 117 118 if (code != 0) 119 (void) syslog(LOG_ERR, 120 "smb_krb5_setpwd: Result: %.*s (%d) %.*s\n", 121 result_code == 0 ? 122 strlen("success") : result_code_string.length, 123 result_code == 0 ? "success" : result_code_string.data, 124 result_code, result_string.length, result_string.data); 125 return (code); 126 } 127 128 /* 129 * smb_krb5_open_wrfile 130 * 131 * Open the keytab file for writing. 132 * The keytab should be closed by calling krb5_kt_close(). 133 */ 134 static int 135 smb_krb5_open_wrfile(krb5_context ctx, char *fname, krb5_keytab *kt) 136 { 137 char *ktname; 138 int len; 139 140 *kt = NULL; 141 len = snprintf(NULL, 0, "WRFILE:%s", fname) + 1; 142 if ((ktname = malloc(len)) == NULL) { 143 syslog(LOG_ERR, "smb_krb5_write_keytab: resource shortage"); 144 return (-1); 145 } 146 147 (void) snprintf(ktname, len, "WRFILE:%s", fname); 148 149 if (krb5_kt_resolve(ctx, ktname, kt) != 0) { 150 syslog(LOG_ERR, "smb_krb5_write_keytab: failed to open/create " 151 "keytab %s\n", fname); 152 free(ktname); 153 return (-1); 154 } 155 156 free(ktname); 157 return (0); 158 } 159 160 /* 161 * smb_krb5_remove_keytab_entries 162 * 163 * Remove the keys from the keytab for the specified principal. 164 */ 165 int 166 smb_krb5_remove_keytab_entries(krb5_context ctx, krb5_principal princ, 167 char *fname) 168 { 169 krb5_keytab kt = NULL; 170 int rc = 0; 171 krb5_error_code code; 172 173 if (smb_krb5_open_wrfile(ctx, fname, &kt) != 0) 174 return (-1); 175 176 if ((code = smb_krb5_ktremove(ctx, kt, princ)) != 0) { 177 syslog(LOG_ERR, "smb_krb5_remove_keytab_entries: %s", 178 error_message(code)); 179 rc = -1; 180 } 181 182 krb5_kt_close(ctx, kt); 183 return (rc); 184 } 185 186 /* 187 * smb_krb5_update_keytab_entries 188 * 189 * Update the keys for the specified principal in the keytab. 190 * Returns 0 on success. Otherwise, returns -1. 191 */ 192 int 193 smb_krb5_update_keytab_entries(krb5_context ctx, krb5_principal princ, 194 char *fname, krb5_kvno kvno, char *passwd, krb5_enctype *enctypes, 195 int enctype_count) 196 { 197 krb5_keytab kt = NULL; 198 int rc = 0, i; 199 krb5_error_code code; 200 201 if (smb_krb5_open_wrfile(ctx, fname, &kt) != 0) 202 return (-1); 203 204 if ((code = smb_krb5_ktremove(ctx, kt, princ)) != 0) { 205 syslog(LOG_ERR, "smb_krb5_update_keytab_entries: %s", 206 error_message(code)); 207 krb5_kt_close(ctx, kt); 208 return (-1); 209 } 210 211 for (i = 0; i < enctype_count; i++) { 212 if (smb_krb5_ktadd(ctx, kt, princ, enctypes[i], kvno, passwd) 213 != 0) { 214 rc = -1; 215 break; 216 } 217 218 } 219 220 krb5_kt_close(ctx, kt); 221 return (rc); 222 } 223 224 /* 225 * smb_krb5_ktremove 226 * 227 * Removes the old entries for the specified principal from the keytab. 228 * 229 * Returns 0 upon success. Otherwise, returns KRB5 error code. 230 */ 231 static krb5_error_code 232 smb_krb5_ktremove(krb5_context ctx, krb5_keytab kt, const krb5_principal princ) 233 { 234 krb5_keytab_entry entry; 235 krb5_kt_cursor cursor; 236 int code; 237 238 code = krb5_kt_get_entry(ctx, kt, princ, 0, 0, &entry); 239 if (code != 0) { 240 if (code == ENOENT || code == KRB5_KT_NOTFOUND) 241 return (0); 242 243 return (code); 244 } 245 246 krb5_kt_free_entry(ctx, &entry); 247 248 if ((code = krb5_kt_start_seq_get(ctx, kt, &cursor)) != 0) 249 return (code); 250 251 while ((code = krb5_kt_next_entry(ctx, kt, &entry, &cursor)) == 0) { 252 if (krb5_principal_compare(ctx, princ, entry.principal)) { 253 254 code = krb5_kt_end_seq_get(ctx, kt, &cursor); 255 if (code != 0) { 256 krb5_kt_free_entry(ctx, &entry); 257 return (code); 258 } 259 260 code = krb5_kt_remove_entry(ctx, kt, &entry); 261 if (code != 0) { 262 krb5_kt_free_entry(ctx, &entry); 263 return (code); 264 } 265 266 code = krb5_kt_start_seq_get(ctx, kt, &cursor); 267 if (code != 0) { 268 krb5_kt_free_entry(ctx, &entry); 269 return (code); 270 } 271 272 } 273 krb5_kt_free_entry(ctx, &entry); 274 } 275 276 if (code && code != KRB5_KT_END) { 277 (void) krb5_kt_end_seq_get(ctx, kt, &cursor); 278 return (code); 279 } 280 281 if ((code = krb5_kt_end_seq_get(ctx, kt, &cursor))) 282 return (code); 283 284 return (0); 285 } 286 287 /* 288 * smb_krb5_ktadd 289 * 290 * Add a Keberos key to the keytab file. 291 * Returns 0 on success. Otherwise, returns -1. 292 */ 293 static int 294 smb_krb5_ktadd(krb5_context ctx, krb5_keytab kt, const krb5_principal princ, 295 krb5_enctype enctype, krb5_kvno kvno, const char *pw) 296 { 297 krb5_keytab_entry *entry; 298 krb5_data password, salt; 299 krb5_keyblock key; 300 krb5_error_code code; 301 char buf[100]; 302 int rc = 0; 303 304 if ((code = krb5_enctype_to_string(enctype, buf, sizeof (buf)))) { 305 syslog(LOG_ERR, "smb_krb5_ktadd[%d]: unknown enctype", 306 enctype); 307 return (-1); 308 } 309 310 if ((entry = (krb5_keytab_entry *) malloc(sizeof (*entry))) == NULL) { 311 syslog(LOG_ERR, "smb_krb5_ktadd[%d]: resource shortage", 312 enctype); 313 return (-1); 314 } 315 316 (void) memset((char *)entry, 0, sizeof (*entry)); 317 318 password.length = strlen(pw); 319 password.data = (char *)pw; 320 321 if ((code = krb5_principal2salt(ctx, princ, &salt)) != 0) { 322 syslog(LOG_ERR, "smb_krb5_ktadd[%d]: failed to compute salt", 323 enctype); 324 free(entry); 325 return (-1); 326 } 327 328 code = krb5_c_string_to_key(ctx, enctype, &password, &salt, &key); 329 krb5_xfree(salt.data); 330 if (code != 0) { 331 syslog(LOG_ERR, "smb_krb5_ktadd[%d]: failed to generate key", 332 enctype); 333 free(entry); 334 return (-1); 335 } 336 337 (void) memcpy(&entry->key, &key, sizeof (krb5_keyblock)); 338 entry->vno = kvno; 339 entry->principal = princ; 340 341 if ((code = krb5_kt_add_entry(ctx, kt, entry)) != 0) { 342 syslog(LOG_ERR, "smb_krb5_ktadd[%d] failed to add entry to " 343 "keytab (%d)", enctype, code); 344 rc = -1; 345 } 346 347 free(entry); 348 return (rc); 349 } 350