lib/kadm5/get_s.c

   1 /*
   2  * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
   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 <krb5_locl.h>
  35 #include "kadm5_locl.h"
  36 #include <assert.h>
  37
  38 RCSID("$Id$");
  39
  40 static kadm5_ret_t
  41 add_tl_data(kadm5_principal_ent_t ent, int16_t type,
  42             const void *data, size_t size)
  43 {
  44     krb5_tl_data *tl;
  45
  46     tl = calloc(1, sizeof(*tl));
  47     if (tl == NULL)
  48         return _kadm5_error_code(ENOMEM);
  49
  50     tl->tl_data_type = type;
  51     tl->tl_data_length = size;
  52     tl->tl_data_contents = malloc(size);
  53     if (tl->tl_data_contents == NULL && size != 0) {
  54         free(tl);
  55         return _kadm5_error_code(ENOMEM);
  56     }
  57     memcpy(tl->tl_data_contents, data, size);
  58
  59     tl->tl_data_next = ent->tl_data;
  60     ent->tl_data = tl;
  61     ent->n_tl_data++;
  62
  63     return 0;
  64 }
  65
  66 static
  67 krb5_error_code
  68 copy_keyset_to_kadm5(kadm5_server_context *context, krb5_kvno kvno,
  69                      size_t n_keys, Key *keys, krb5_salt *salt,
  70                      kadm5_principal_ent_t out)
  71 {
  72     size_t i;
  73     Key *key;
  74     krb5_key_data *kd;
  75     krb5_data *sp;
  76     krb5_error_code ret = 0;
  77
  78     for (i = 0; i < n_keys; i++) {
  79         key = &keys[i];
  80         kd = &out->key_data[out->n_key_data];
  81         kd->key_data_ver = 2;
  82         kd->key_data_kvno = kvno;
  83         kd->key_data_type[0] = key->key.keytype;
  84         if(key->salt)
  85             kd->key_data_type[1] = key->salt->type;
  86         else
  87             kd->key_data_type[1] = KRB5_PADATA_PW_SALT;
  88         /* setup key */
  89         kd->key_data_length[0] = key->key.keyvalue.length;
  90         kd->key_data_contents[0] = malloc(kd->key_data_length[0]);
  91         if(kd->key_data_contents[0] == NULL && kd->key_data_length[0] != 0){
  92             ret = ENOMEM;
  93             break;
  94         }
  95         memcpy(kd->key_data_contents[0], key->key.keyvalue.data,
  96                kd->key_data_length[0]);
  97         /* setup salt */
  98         if(key->salt)
  99             sp = &key->salt->salt;
 100         else
 101             sp = &salt->saltvalue;
 102         kd->key_data_length[1] = sp->length;
 103         kd->key_data_contents[1] = malloc(kd->key_data_length[1]);
 104         if(kd->key_data_length[1] != 0
 105            && kd->key_data_contents[1] == NULL) {
 106             memset(kd->key_data_contents[0], 0, kd->key_data_length[0]);
 107             ret = ENOMEM;
 108             break;
 109         }
 110         memcpy(kd->key_data_contents[1], sp->data, kd->key_data_length[1]);
 111         out->n_key_data++;
 112     }
 113
 114     return ret;
 115 }
 116
 117 kadm5_ret_t
 118 kadm5_s_get_principal(void *server_handle,
 119                       krb5_principal princ,
 120                       kadm5_principal_ent_t out,
 121                       uint32_t mask)
 122 {
 123     kadm5_server_context *context = server_handle;
 124     kadm5_ret_t ret;
 125     hdb_entry_ex ent;
 126     int hdb_is_rw = 1;
 127
 128     memset(&ent, 0, sizeof(ent));
 129     memset(out, 0, sizeof(*out));
 130
 131     if (!context->keep_open) {
 132         ret = context->db->hdb_open(context->context, context->db, O_RDWR, 0);
 133         if (ret == EPERM || ret == EACCES) {
 134             ret = context->db->hdb_open(context->context, context->db, O_RDONLY, 0);
 135             hdb_is_rw = 0;
 136         }
 137         if (ret)
 138             return ret;
 139     }
 140
 141     /*
 142      * Attempt to recover the log.  This will generally fail on slaves,
 143      * and we can't tell if we're on a slave here.
 144      *
 145      * Perhaps we could set a flag in the kadm5_server_context to
 146      * indicate whether a read has been done without recovering the log,
 147      * in which case we could fail any subsequent writes.
 148      */
 149     if (hdb_is_rw && kadm5_log_init_nb(context) == 0)
 150         (void) kadm5_log_end(context);
 151
 152     ret = context->db->hdb_fetch_kvno(context->context, context->db, princ,
 153                                       HDB_F_DECRYPT|HDB_F_ALL_KVNOS|
 154                                       HDB_F_GET_ANY|HDB_F_ADMIN_DATA, 0, &ent);
 155
 156     if (!context->keep_open)
 157         context->db->hdb_close(context->context, context->db);
 158     if(ret)
 159         return _kadm5_error_code(ret);
 160
 161     if(mask & KADM5_PRINCIPAL)
 162         ret  = krb5_copy_principal(context->context, ent.entry.principal,
 163                                    &out->principal);
 164     if(ret)
 165         goto out;
 166     if(mask & KADM5_PRINC_EXPIRE_TIME && ent.entry.valid_end)
 167         out->princ_expire_time = *ent.entry.valid_end;
 168     if(mask & KADM5_PW_EXPIRATION && ent.entry.pw_end)
 169         out->pw_expiration = *ent.entry.pw_end;
 170     if(mask & KADM5_LAST_PWD_CHANGE)
 171         hdb_entry_get_pw_change_time(&ent.entry, &out->last_pwd_change);
 172     if(mask & KADM5_ATTRIBUTES){
 173         out->attributes |= ent.entry.flags.postdate ? 0 : KRB5_KDB_DISALLOW_POSTDATED;
 174         out->attributes |= ent.entry.flags.forwardable ? 0 : KRB5_KDB_DISALLOW_FORWARDABLE;
 175         out->attributes |= ent.entry.flags.initial ? KRB5_KDB_DISALLOW_TGT_BASED : 0;
 176         out->attributes |= ent.entry.flags.renewable ? 0 : KRB5_KDB_DISALLOW_RENEWABLE;
 177         out->attributes |= ent.entry.flags.proxiable ? 0 : KRB5_KDB_DISALLOW_PROXIABLE;
 178         out->attributes |= ent.entry.flags.invalid ? KRB5_KDB_DISALLOW_ALL_TIX : 0;
 179         out->attributes |= ent.entry.flags.require_preauth ? KRB5_KDB_REQUIRES_PRE_AUTH : 0;
 180         out->attributes |= ent.entry.flags.require_pwchange ? KRB5_KDB_REQUIRES_PWCHANGE : 0;
 181         out->attributes |= ent.entry.flags.server ? 0 : KRB5_KDB_DISALLOW_SVR;
 182         out->attributes |= ent.entry.flags.change_pw ? KRB5_KDB_PWCHANGE_SERVICE : 0;
 183         out->attributes |= ent.entry.flags.ok_as_delegate ? KRB5_KDB_OK_AS_DELEGATE : 0;
 184         out->attributes |= ent.entry.flags.trusted_for_delegation ? KRB5_KDB_TRUSTED_FOR_DELEGATION : 0;
 185         out->attributes |= ent.entry.flags.allow_kerberos4 ? KRB5_KDB_ALLOW_KERBEROS4 : 0;
 186         out->attributes |= ent.entry.flags.allow_digest ? KRB5_KDB_ALLOW_DIGEST : 0;
 187     }
 188     if(mask & KADM5_MAX_LIFE) {
 189         if(ent.entry.max_life)
 190             out->max_life = *ent.entry.max_life;
 191         else
 192             out->max_life = INT_MAX;
 193     }
 194     if(mask & KADM5_MOD_TIME) {
 195         if(ent.entry.modified_by)
 196             out->mod_date = ent.entry.modified_by->time;
 197         else
 198             out->mod_date = ent.entry.created_by.time;
 199     }
 200     if(mask & KADM5_MOD_NAME) {
 201         if(ent.entry.modified_by) {
 202             if (ent.entry.modified_by->principal != NULL)
 203                 ret = krb5_copy_principal(context->context,
 204                                           ent.entry.modified_by->principal,
 205                                           &out->mod_name);
 206         } else if(ent.entry.created_by.principal != NULL)
 207             ret = krb5_copy_principal(context->context,
 208                                       ent.entry.created_by.principal,
 209                                       &out->mod_name);
 210         else
 211             out->mod_name = NULL;
 212     }
 213     if(ret)
 214         goto out;
 215
 216     if(mask & KADM5_KVNO)
 217         out->kvno = ent.entry.kvno;
 218     if(mask & KADM5_MKVNO) {
 219         size_t n;
 220         out->mkvno = 0; /* XXX */
 221         for(n = 0; n < ent.entry.keys.len; n++)
 222             if(ent.entry.keys.val[n].mkvno) {
 223                 out->mkvno = *ent.entry.keys.val[n].mkvno; /* XXX this isn't right */
 224                 break;
 225             }
 226     }
 227 #if 0 /* XXX implement */
 228     if(mask & KADM5_AUX_ATTRIBUTES)
 229         ;
 230     if(mask & KADM5_LAST_SUCCESS)
 231         ;
 232     if(mask & KADM5_LAST_FAILED)
 233         ;
 234     if(mask & KADM5_FAIL_AUTH_COUNT)
 235         ;
 236 #endif
 237     if(mask & KADM5_POLICY) {
 238         HDB_extension *ext;
 239
 240         ext = hdb_find_extension(&ent.entry, choice_HDB_extension_data_policy);
 241         if (ext == NULL) {
 242             out->policy = strdup("default");
 243             /* It's OK if we retun NULL instead of "default" */
 244         } else {
 245             out->policy = strdup(ext->data.u.policy);
 246             if (out->policy == NULL) {
 247                 ret = ENOMEM;
 248                 goto out;
 249             }
 250         }
 251     }
 252     if(mask & KADM5_MAX_RLIFE) {
 253         if(ent.entry.max_renew)
 254             out->max_renewable_life = *ent.entry.max_renew;
 255         else
 256             out->max_renewable_life = INT_MAX;
 257     }
 258     if(mask & KADM5_KEY_DATA){
 259         size_t i;
 260         size_t n_keys = ent.entry.keys.len;
 261         krb5_salt salt;
 262         HDB_extension *ext;
 263         HDB_Ext_KeySet *hist_keys = NULL;
 264
 265         /* Don't return stale keys to kadm5 clients */
 266         ret = hdb_prune_keys(context->context, &ent.entry);
 267         if (ret)
 268             goto out;
 269         ext = hdb_find_extension(&ent.entry, choice_HDB_extension_data_hist_keys);
 270         if (ext != NULL)
 271             hist_keys = &ext->data.u.hist_keys;
 272
 273         krb5_get_pw_salt(context->context, ent.entry.principal, &salt);
 274         for (i = 0; hist_keys != NULL && i < hist_keys->len; i++)
 275             n_keys += hist_keys->val[i].keys.len;
 276         out->key_data = malloc(n_keys * sizeof(*out->key_data));
 277         if (out->key_data == NULL && n_keys != 0) {
 278             ret = ENOMEM;
 279             goto out;
 280         }
 281         out->n_key_data = 0;
 282         ret = copy_keyset_to_kadm5(context, ent.entry.kvno, ent.entry.keys.len,
 283                                    ent.entry.keys.val, &salt, out);
 284         if (ret)
 285             goto out;
 286         for (i = 0; hist_keys != NULL && i < hist_keys->len; i++) {
 287             ret = copy_keyset_to_kadm5(context, hist_keys->val[i].kvno,
 288                                        hist_keys->val[i].keys.len,
 289                                        hist_keys->val[i].keys.val,
 290                                        &salt, out);
 291             if (ret)
 292                 goto out;
 293         }
 294         krb5_free_salt(context->context, salt);
 295         assert( out->n_key_data == n_keys );
 296     }
 297     if (ret)
 298         goto out;
 299     if(mask & KADM5_TL_DATA) {
 300         time_t last_pw_expire;
 301         const HDB_Ext_PKINIT_acl *acl;
 302         const HDB_Ext_Aliases *aliases;
 303
 304         ret = hdb_entry_get_pw_change_time(&ent.entry, &last_pw_expire);
 305         if (ret == 0 && last_pw_expire) {
 306             unsigned char buf[4];
 307             _krb5_put_int(buf, last_pw_expire, sizeof(buf));
 308             ret = add_tl_data(out, KRB5_TL_LAST_PWD_CHANGE, buf, sizeof(buf));
 309         }
 310         if (ret)
 311             goto out;
 312         /*
 313          * If the client was allowed to get key data, let it have the
 314          * password too.
 315          */
 316         if (mask & KADM5_KEY_DATA) {
 317             heim_utf8_string pw;
 318
 319             ret = hdb_entry_get_password(context->context,
 320                                          context->db, &ent.entry, &pw);
 321             if (ret == 0) {
 322                 ret = add_tl_data(out, KRB5_TL_PASSWORD, pw, strlen(pw) + 1);
 323                 free(pw);
 324             }
 325             krb5_clear_error_message(context->context);
 326         }
 327
 328         ret = hdb_entry_get_pkinit_acl(&ent.entry, &acl);
 329         if (ret == 0 && acl) {
 330             krb5_data buf;
 331             size_t len;
 332
 333             ASN1_MALLOC_ENCODE(HDB_Ext_PKINIT_acl, buf.data, buf.length,
 334                                 acl, &len, ret);
 335             if (ret)
 336                 goto out;
 337             if (len != buf.length)
 338                 krb5_abortx(context->context,
 339                             "internal ASN.1 encoder error");
 340             ret = add_tl_data(out, KRB5_TL_PKINIT_ACL, buf.data, buf.length);
 341             free(buf.data);
 342             if (ret)
 343                 goto out;
 344         }
 345         if (ret)
 346             goto out;
 347
 348         ret = hdb_entry_get_aliases(&ent.entry, &aliases);
 349         if (ret == 0 && aliases) {
 350             krb5_data buf;
 351             size_t len;
 352
 353             ASN1_MALLOC_ENCODE(HDB_Ext_Aliases, buf.data, buf.length,
 354                                aliases, &len, ret);
 355             if (ret)
 356                 goto out;
 357             if (len != buf.length)
 358                 krb5_abortx(context->context,
 359                             "internal ASN.1 encoder error");
 360             ret = add_tl_data(out, KRB5_TL_ALIASES, buf.data, buf.length);
 361             free(buf.data);
 362             if (ret)
 363                 goto out;
 364         }
 365         if (ret)
 366             goto out;
 367     }
 368
 369  out:
 370     if (ret)
 371         kadm5_free_principal_ent(context, out);
 372     hdb_free_entry(context->context, &ent);
 373
 374     return _kadm5_error_code(ret);
 375 }