crypto/external/bsd/heimdal/dist/lib/kafs/afskrb5.c

   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 }