1 /* $NetBSD: afskrb5.c,v 1.1.1.2 2014/04/24 12:45:49 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1995-2003 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 "kafs_locl.h" 37 38 struct krb5_kafs_data { 39 krb5_context context; 40 krb5_ccache id; 41 krb5_const_realm realm; 42 }; 43 44 enum { 45 KAFS_RXKAD_2B_KVNO = 213, 46 KAFS_RXKAD_K5_KVNO = 256 47 }; 48 49 static int 50 v5_to_kt(krb5_creds *cred, uid_t uid, struct kafs_token *kt, int local524) 51 { 52 int kvno, ret; 53 54 kt->ticket = NULL; 55 56 /* check if des key */ 57 if (cred->session.keyvalue.length != 8) 58 return EINVAL; 59 60 if (local524) { 61 Ticket t; 62 unsigned char *buf; 63 size_t buf_len; 64 size_t len; 65 66 kvno = KAFS_RXKAD_2B_KVNO; 67 68 ret = decode_Ticket(cred->ticket.data, cred->ticket.length, &t, &len); 69 if (ret) 70 return ret; 71 if (t.tkt_vno != 5) 72 return -1; 73 74 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_len, &t.enc_part, 75 &len, ret); 76 free_Ticket(&t); 77 if (ret) 78 return ret; 79 if(buf_len != len) { 80 free(buf); 81 return KRB5KRB_ERR_GENERIC; 82 } 83 84 kt->ticket = buf; 85 kt->ticket_len = buf_len; 86 87 } else { 88 kvno = KAFS_RXKAD_K5_KVNO; 89 kt->ticket = malloc(cred->ticket.length); 90 if (kt->ticket == NULL) 91 return ENOMEM; 92 kt->ticket_len = cred->ticket.length; 93 memcpy(kt->ticket, cred->ticket.data, kt->ticket_len); 94 95 ret = 0; 96 } 97 98 99 /* 100 * Build a struct ClearToken 101 */ 102 103 kt->ct.AuthHandle = kvno; 104 memcpy(kt->ct.HandShakeKey, cred->session.keyvalue.data, 8); 105 kt->ct.ViceId = uid; 106 kt->ct.BeginTimestamp = cred->times.starttime; 107 kt->ct.EndTimestamp = cred->times.endtime; 108 109 _kafs_fixup_viceid(&kt->ct, uid); 110 111 return 0; 112 } 113 114 static krb5_error_code 115 v5_convert(krb5_context context, krb5_ccache id, 116 krb5_creds *cred, uid_t uid, 117 const char *cell, 118 struct kafs_token *kt) 119 { 120 krb5_error_code ret; 121 char *c, *val; 122 123 c = strdup(cell); 124 if (c == NULL) 125 return ENOMEM; 126 _kafs_foldup(c, c); 127 krb5_appdefault_string (context, "libkafs", 128 c, 129 "afs-use-524", "2b", &val); 130 free(c); 131 132 if (strcasecmp(val, "local") == 0 || 133 strcasecmp(val, "2b") == 0) 134 ret = v5_to_kt(cred, uid, kt, 1); 135 else 136 ret = v5_to_kt(cred, uid, kt, 0); 137 138 free(val); 139 return ret; 140 } 141 142 143 /* 144 * 145 */ 146 147 static int 148 get_cred(struct kafs_data *data, const char *name, const char *inst, 149 const char *realm, uid_t uid, struct kafs_token *kt) 150 { 151 krb5_error_code ret; 152 krb5_creds in_creds, *out_creds; 153 struct krb5_kafs_data *d = data->data; 154 int invalid; 155 156 memset(&in_creds, 0, sizeof(in_creds)); 157 158 ret = krb5_make_principal(d->context, &in_creds.server, 159 realm, name, inst, NULL); 160 if(ret) 161 return ret; 162 ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client); 163 if(ret){ 164 krb5_free_principal(d->context, in_creds.server); 165 return ret; 166 } 167 168 in_creds.session.keytype = ETYPE_DES_CBC_CRC; 169 170 /* check if des is disable, and in that case enable it for afs */ 171 invalid = krb5_enctype_valid(d->context, in_creds.session.keytype); 172 if (invalid) 173 krb5_enctype_enable(d->context, in_creds.session.keytype); 174 175 ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds); 176 if (ret) { 177 in_creds.session.keytype = ETYPE_DES_CBC_MD5; 178 ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds); 179 } 180 181 if (invalid) 182 krb5_enctype_disable(d->context, in_creds.session.keytype); 183 184 krb5_free_principal(d->context, in_creds.server); 185 krb5_free_principal(d->context, in_creds.client); 186 if(ret) 187 return ret; 188 189 ret = v5_convert(d->context, d->id, out_creds, uid, 190 (inst != NULL && inst[0] != '\0') ? inst : realm, kt); 191 krb5_free_creds(d->context, out_creds); 192 193 return ret; 194 } 195 196 static const char * 197 get_error(struct kafs_data *data, int error) 198 { 199 struct krb5_kafs_data *d = data->data; 200 return krb5_get_error_message(d->context, error); 201 } 202 203 static void 204 free_error(struct kafs_data *data, const char *str) 205 { 206 struct krb5_kafs_data *d = data->data; 207 krb5_free_error_message(d->context, str); 208 } 209 210 static krb5_error_code 211 afslog_uid_int(struct kafs_data *data, const char *cell, const char *rh, 212 uid_t uid, const char *homedir) 213 { 214 krb5_error_code ret; 215 struct kafs_token kt; 216 krb5_principal princ; 217 const char *trealm; /* ticket realm */ 218 struct krb5_kafs_data *d = data->data; 219 220 if (cell == 0 || cell[0] == 0) 221 return _kafs_afslog_all_local_cells (data, uid, homedir); 222 223 ret = krb5_cc_get_principal (d->context, d->id, &princ); 224 if (ret) 225 return ret; 226 227 trealm = krb5_principal_get_realm (d->context, princ); 228 229 kt.ticket = NULL; 230 ret = _kafs_get_cred(data, cell, d->realm, trealm, uid, &kt); 231 krb5_free_principal (d->context, princ); 232 233 if(ret == 0) { 234 ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len); 235 free(kt.ticket); 236 } 237 return ret; 238 } 239 240 static char * 241 get_realm(struct kafs_data *data, const char *host) 242 { 243 struct krb5_kafs_data *d = data->data; 244 krb5_realm *realms; 245 char *r; 246 if(krb5_get_host_realm(d->context, host, &realms)) 247 return NULL; 248 r = strdup(realms[0]); 249 krb5_free_host_realm(d->context, realms); 250 return r; 251 } 252 253 krb5_error_code 254 krb5_afslog_uid_home(krb5_context context, 255 krb5_ccache id, 256 const char *cell, 257 krb5_const_realm realm, 258 uid_t uid, 259 const char *homedir) 260 { 261 struct kafs_data kd; 262 struct krb5_kafs_data d; 263 krb5_error_code ret; 264 265 kd.name = "krb5"; 266 kd.afslog_uid = afslog_uid_int; 267 kd.get_cred = get_cred; 268 kd.get_realm = get_realm; 269 kd.get_error = get_error; 270 kd.free_error = free_error; 271 kd.data = &d; 272 if (context == NULL) { 273 ret = krb5_init_context(&d.context); 274 if (ret) 275 return ret; 276 } else 277 d.context = context; 278 if (id == NULL) { 279 ret = krb5_cc_default(d.context, &d.id); 280 if (ret) 281 goto out; 282 } else 283 d.id = id; 284 d.realm = realm; 285 ret = afslog_uid_int(&kd, cell, 0, uid, homedir); 286 if (id == NULL) 287 krb5_cc_close(context, d.id); 288 out: 289 if (context == NULL) 290 krb5_free_context(d.context); 291 return ret; 292 } 293 294 krb5_error_code 295 krb5_afslog_uid(krb5_context context, 296 krb5_ccache id, 297 const char *cell, 298 krb5_const_realm realm, 299 uid_t uid) 300 { 301 return krb5_afslog_uid_home (context, id, cell, realm, uid, NULL); 302 } 303 304 krb5_error_code 305 krb5_afslog(krb5_context context, 306 krb5_ccache id, 307 const char *cell, 308 krb5_const_realm realm) 309 { 310 return krb5_afslog_uid (context, id, cell, realm, getuid()); 311 } 312 313 krb5_error_code 314 krb5_afslog_home(krb5_context context, 315 krb5_ccache id, 316 const char *cell, 317 krb5_const_realm realm, 318 const char *homedir) 319 { 320 return krb5_afslog_uid_home (context, id, cell, realm, getuid(), homedir); 321 } 322 323 /* 324 * 325 */ 326 327 krb5_error_code 328 krb5_realm_of_cell(const char *cell, char **realm) 329 { 330 struct kafs_data kd; 331 332 kd.name = "krb5"; 333 kd.get_realm = get_realm; 334 kd.get_error = get_error; 335 kd.free_error = free_error; 336 return _kafs_realm_of_cell(&kd, cell, realm); 337 } 338 339 /* 340 * 341 */ 342 343 int 344 kafs_settoken5(krb5_context context, const char *cell, uid_t uid, 345 krb5_creds *cred) 346 { 347 struct kafs_token kt; 348 int ret; 349 350 ret = v5_convert(context, NULL, cred, uid, cell, &kt); 351 if (ret) 352 return ret; 353 354 ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len); 355 356 free(kt.ticket); 357 358 return ret; 359 } 360