1 /* 2 * Copyright (c) 1995-2003 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "kafs_locl.h" 35 36 RCSID("$Id: afskrb5.c 17032 2006-04-10 08:45:04Z lha $"); 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 if(strcasecmp(val, "yes") == 0 || 136 strcasecmp(val, "true") == 0 || 137 atoi(val)) { 138 struct credentials cred4; 139 140 if (id == NULL) 141 ret = krb524_convert_creds_kdc(context, cred, &cred4); 142 else 143 ret = krb524_convert_creds_kdc_ccache(context, id, cred, &cred4); 144 if (ret) 145 goto out; 146 147 ret = _kafs_v4_to_kt(&cred4, uid, kt); 148 } else 149 ret = v5_to_kt(cred, uid, kt, 0); 150 151 out: 152 free(val); 153 return ret; 154 } 155 156 157 /* 158 * 159 */ 160 161 static int 162 get_cred(struct kafs_data *data, const char *name, const char *inst, 163 const char *realm, uid_t uid, struct kafs_token *kt) 164 { 165 krb5_error_code ret; 166 krb5_creds in_creds, *out_creds; 167 struct krb5_kafs_data *d = data->data; 168 169 memset(&in_creds, 0, sizeof(in_creds)); 170 ret = krb5_425_conv_principal(d->context, name, inst, realm, 171 &in_creds.server); 172 if(ret) 173 return ret; 174 ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client); 175 if(ret){ 176 krb5_free_principal(d->context, in_creds.server); 177 return ret; 178 } 179 in_creds.session.keytype = ETYPE_DES_CBC_CRC; 180 ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds); 181 krb5_free_principal(d->context, in_creds.server); 182 krb5_free_principal(d->context, in_creds.client); 183 if(ret) 184 return ret; 185 186 ret = v5_convert(d->context, d->id, out_creds, uid, 187 (inst != NULL && inst[0] != '\0') ? inst : realm, kt); 188 krb5_free_creds(d->context, out_creds); 189 190 return ret; 191 } 192 193 static krb5_error_code 194 afslog_uid_int(struct kafs_data *data, const char *cell, const char *rh, 195 uid_t uid, const char *homedir) 196 { 197 krb5_error_code ret; 198 struct kafs_token kt; 199 krb5_principal princ; 200 const char *trealm; /* ticket realm */ 201 struct krb5_kafs_data *d = data->data; 202 203 if (cell == 0 || cell[0] == 0) 204 return _kafs_afslog_all_local_cells (data, uid, homedir); 205 206 ret = krb5_cc_get_principal (d->context, d->id, &princ); 207 if (ret) 208 return ret; 209 210 trealm = krb5_principal_get_realm (d->context, princ); 211 212 kt.ticket = NULL; 213 ret = _kafs_get_cred(data, cell, d->realm, trealm, uid, &kt); 214 krb5_free_principal (d->context, princ); 215 216 if(ret == 0) { 217 ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len); 218 free(kt.ticket); 219 } 220 return ret; 221 } 222 223 static char * 224 get_realm(struct kafs_data *data, const char *host) 225 { 226 struct krb5_kafs_data *d = data->data; 227 krb5_realm *realms; 228 char *r; 229 if(krb5_get_host_realm(d->context, host, &realms)) 230 return NULL; 231 r = strdup(realms[0]); 232 krb5_free_host_realm(d->context, realms); 233 return r; 234 } 235 236 krb5_error_code 237 krb5_afslog_uid_home(krb5_context context, 238 krb5_ccache id, 239 const char *cell, 240 krb5_const_realm realm, 241 uid_t uid, 242 const char *homedir) 243 { 244 struct kafs_data kd; 245 struct krb5_kafs_data d; 246 krb5_error_code ret; 247 248 kd.name = "krb5"; 249 kd.afslog_uid = afslog_uid_int; 250 kd.get_cred = get_cred; 251 kd.get_realm = get_realm; 252 kd.data = &d; 253 if (context == NULL) { 254 ret = krb5_init_context(&d.context); 255 if (ret) 256 return ret; 257 } else 258 d.context = context; 259 if (id == NULL) { 260 ret = krb5_cc_default(d.context, &d.id); 261 if (ret) 262 goto out; 263 } else 264 d.id = id; 265 d.realm = realm; 266 ret = afslog_uid_int(&kd, cell, 0, uid, homedir); 267 if (id == NULL) 268 krb5_cc_close(context, d.id); 269 out: 270 if (context == NULL) 271 krb5_free_context(d.context); 272 return ret; 273 } 274 275 krb5_error_code 276 krb5_afslog_uid(krb5_context context, 277 krb5_ccache id, 278 const char *cell, 279 krb5_const_realm realm, 280 uid_t uid) 281 { 282 return krb5_afslog_uid_home (context, id, cell, realm, uid, NULL); 283 } 284 285 krb5_error_code 286 krb5_afslog(krb5_context context, 287 krb5_ccache id, 288 const char *cell, 289 krb5_const_realm realm) 290 { 291 return krb5_afslog_uid (context, id, cell, realm, getuid()); 292 } 293 294 krb5_error_code 295 krb5_afslog_home(krb5_context context, 296 krb5_ccache id, 297 const char *cell, 298 krb5_const_realm realm, 299 const char *homedir) 300 { 301 return krb5_afslog_uid_home (context, id, cell, realm, getuid(), homedir); 302 } 303 304 /* 305 * 306 */ 307 308 krb5_error_code 309 krb5_realm_of_cell(const char *cell, char **realm) 310 { 311 struct kafs_data kd; 312 313 kd.name = "krb5"; 314 kd.get_realm = get_realm; 315 return _kafs_realm_of_cell(&kd, cell, realm); 316 } 317 318 /* 319 * 320 */ 321 322 int 323 kafs_settoken5(krb5_context context, const char *cell, uid_t uid, 324 krb5_creds *cred) 325 { 326 struct kafs_token kt; 327 int ret; 328 329 ret = v5_convert(context, NULL, cred, uid, cell, &kt); 330 if (ret) 331 return ret; 332 333 ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len); 334 335 free(kt.ticket); 336 337 return ret; 338 } 339