/* * Copyright (c) 1999 - 2002 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "hdb_locl.h" /* keytab backend for HDB databases */ struct hdb_data { char *dbname; char *mkey; }; /* * the format for HDB keytabs is: * HDB:[database:file:mkey] */ static krb5_error_code hdb_resolve(krb5_context context, const char *name, krb5_keytab id) { struct hdb_data *d; const char *db, *mkey; d = malloc(sizeof(*d)); if(d == NULL) { krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); return ENOMEM; } db = name; mkey = strchr(name, ':'); if(mkey == NULL || mkey[1] == '\0') { if(*name == '\0') d->dbname = NULL; else { d->dbname = strdup(name); if(d->dbname == NULL) { free(d); krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); return ENOMEM; } } d->mkey = NULL; } else { if((mkey - db) == 0) { d->dbname = NULL; } else { d->dbname = malloc(mkey - db + 1); if(d->dbname == NULL) { free(d); krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); return ENOMEM; } memmove(d->dbname, db, mkey - db); d->dbname[mkey - db] = '\0'; } d->mkey = strdup(mkey + 1); if(d->mkey == NULL) { free(d->dbname); free(d); krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); return ENOMEM; } } id->data = d; return 0; } static krb5_error_code hdb_close(krb5_context context, krb5_keytab id) { struct hdb_data *d = id->data; free(d->dbname); free(d->mkey); free(d); return 0; } static krb5_error_code hdb_get_name(krb5_context context, krb5_keytab id, char *name, size_t namesize) { struct hdb_data *d = id->data; snprintf(name, namesize, "%s%s%s", d->dbname ? d->dbname : "", (d->dbname || d->mkey) ? ":" : "", d->mkey ? d->mkey : ""); return 0; } /* * try to figure out the database (`dbname') and master-key (`mkey') * that should be used for `principal'. */ static krb5_error_code find_db (krb5_context context, char **dbname, char **mkey, krb5_const_principal principal) { krb5_const_realm realm = krb5_principal_get_realm(context, principal); krb5_error_code ret; struct hdb_dbinfo *head, *dbinfo = NULL; *dbname = *mkey = NULL; ret = hdb_get_dbinfo(context, &head); if (ret) return ret; while ((dbinfo = hdb_dbinfo_get_next(head, dbinfo)) != NULL) { const char *p = hdb_dbinfo_get_realm(context, dbinfo); if (p && strcmp (realm, p) == 0) { p = hdb_dbinfo_get_dbname(context, dbinfo); if (p) *dbname = strdup(p); p = hdb_dbinfo_get_mkey_file(context, dbinfo); if (p) *mkey = strdup(p); break; } } hdb_free_dbinfo(context, &head); if (*dbname == NULL) *dbname = strdup(HDB_DEFAULT_DB); return 0; } /* * find the keytab entry in `id' for `principal, kvno, enctype' and return * it in `entry'. return 0 or an error code */ static krb5_error_code hdb_get_entry(krb5_context context, krb5_keytab id, krb5_const_principal principal, krb5_kvno kvno, krb5_enctype enctype, krb5_keytab_entry *entry) { hdb_entry_ex ent; krb5_error_code ret; struct hdb_data *d = id->data; const char *dbname = d->dbname; const char *mkey = d->mkey; char *fdbname = NULL, *fmkey = NULL; HDB *db; int i; memset(&ent, 0, sizeof(ent)); if (dbname == NULL) { ret = find_db(context, &fdbname, &fmkey, principal); if (ret) return ret; dbname = fdbname; mkey = fmkey; } ret = hdb_create (context, &db, dbname); if (ret) goto out2; ret = hdb_set_master_keyfile (context, db, mkey); if (ret) { (*db->hdb_destroy)(context, db); goto out2; } ret = (*db->hdb_open)(context, db, O_RDONLY, 0); if (ret) { (*db->hdb_destroy)(context, db); goto out2; } ret = (*db->hdb_fetch)(context, db, principal, HDB_F_DECRYPT| HDB_F_GET_CLIENT|HDB_F_GET_SERVER|HDB_F_GET_KRBTGT, &ent); if(ret == HDB_ERR_NOENTRY) { ret = KRB5_KT_NOTFOUND; goto out; }else if(ret) goto out; if(kvno && ent.entry.kvno != kvno) { hdb_free_entry(context, &ent); ret = KRB5_KT_NOTFOUND; goto out; } if(enctype == 0) if(ent.entry.keys.len > 0) enctype = ent.entry.keys.val[0].key.keytype; ret = KRB5_KT_NOTFOUND; for(i = 0; i < ent.entry.keys.len; i++) { if(ent.entry.keys.val[i].key.keytype == enctype) { krb5_copy_principal(context, principal, &entry->principal); entry->vno = ent.entry.kvno; krb5_copy_keyblock_contents(context, &ent.entry.keys.val[i].key, &entry->keyblock); ret = 0; break; } } hdb_free_entry(context, &ent); out: (*db->hdb_close)(context, db); (*db->hdb_destroy)(context, db); out2: free(fdbname); free(fmkey); return ret; } krb5_kt_ops hdb_kt_ops = { "HDB", hdb_resolve, hdb_get_name, hdb_close, NULL, /* destroy */ hdb_get_entry, NULL, /* start_seq_get */ NULL, /* next_entry */ NULL, /* end_seq_get */ NULL, /* add */ NULL /* remove */ };