2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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34 #include "krb5_locl.h"
41 /*! @mainpage Heimdal database backend library
43 * @section intro Introduction
45 * Heimdal libhdb library provides the backend support for Heimdal kdc
46 * and kadmind. Its here where plugins for diffrent database engines
47 * can be pluged in and extend support for here Heimdal get the
48 * principal and policy data from.
50 * Example of Heimdal backend are:
58 * The project web page: http://www.h5l.org/
62 const int hdb_interface_version = HDB_INTERFACE_VERSION;
64 static struct hdb_method methods[] = {
65 #if HAVE_DB1 || HAVE_DB3
66 { HDB_INTERFACE_VERSION, "db:", hdb_db_create},
69 { HDB_INTERFACE_VERSION, "ndbm:", hdb_ndbm_create},
71 #if defined(OPENLDAP) && !defined(OPENLDAP_MODULE)
72 { HDB_INTERFACE_VERSION, "ldap:", hdb_ldap_create},
73 { HDB_INTERFACE_VERSION, "ldapi:", hdb_ldapi_create},
75 { HDB_INTERFACE_VERSION, "sqlite:", hdb_sqlite_create},
79 #if HAVE_DB1 || HAVE_DB3
80 static struct hdb_method dbmetod =
81 { HDB_INTERFACE_VERSION, "", hdb_db_create };
82 #elif defined(HAVE_NDBM)
83 static struct hdb_method dbmetod =
84 { HDB_INTERFACE_VERSION, "", hdb_ndbm_create };
89 hdb_next_enctype2key(krb5_context context,
96 for (k = *key ? (*key) + 1 : e->keys.val;
97 k < e->keys.val + e->keys.len;
100 if(k->key.keytype == enctype){
105 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
106 "No next enctype %d for hdb-entry",
108 return KRB5_PROG_ETYPE_NOSUPP; /* XXX */
112 hdb_enctype2key(krb5_context context,
114 krb5_enctype enctype,
118 return hdb_next_enctype2key(context, e, enctype, key);
122 hdb_free_key(Key *key)
124 memset(key->key.keyvalue.data,
126 key->key.keyvalue.length);
133 hdb_lock(int fd, int operation)
137 for(i = 0; i < 3; i++){
138 code = flock(fd, (operation == HDB_RLOCK ? LOCK_SH : LOCK_EX) | LOCK_NB);
139 if(code == 0 || errno != EWOULDBLOCK)
145 if(errno == EWOULDBLOCK)
146 return HDB_ERR_DB_INUSE;
147 return HDB_ERR_CANT_LOCK_DB;
154 code = flock(fd, LOCK_UN);
156 return 4711 /* XXX */;
161 hdb_free_entry(krb5_context context, hdb_entry_ex *ent)
166 (*ent->free_entry)(context, ent);
168 for(i = 0; i < ent->entry.keys.len; ++i) {
169 Key *k = &ent->entry.keys.val[i];
171 memset (k->key.keyvalue.data, 0, k->key.keyvalue.length);
173 free_hdb_entry(&ent->entry);
177 hdb_foreach(krb5_context context,
180 hdb_foreach_func_t func,
185 ret = db->hdb_firstkey(context, db, flags, &entry);
187 krb5_clear_error_message(context);
189 ret = (*func)(context, db, &entry, data);
190 hdb_free_entry(context, &entry);
192 ret = db->hdb_nextkey(context, db, flags, &entry);
194 if(ret == HDB_ERR_NOENTRY)
200 hdb_check_db_format(krb5_context context, HDB *db)
204 krb5_error_code ret, ret2;
208 ret = db->hdb_lock(context, db, HDB_RLOCK);
212 tag.data = HDB_DB_FORMAT_ENTRY;
213 tag.length = strlen(tag.data);
214 ret = (*db->hdb__get)(context, db, tag, &version);
215 ret2 = db->hdb_unlock(context, db);
220 foo = sscanf(version.data, "%u", &ver);
221 krb5_data_free (&version);
223 return HDB_ERR_BADVERSION;
224 if(ver != HDB_DB_FORMAT)
225 return HDB_ERR_BADVERSION;
230 hdb_init_db(krb5_context context, HDB *db)
232 krb5_error_code ret, ret2;
237 ret = hdb_check_db_format(context, db);
238 if(ret != HDB_ERR_NOENTRY)
241 ret = db->hdb_lock(context, db, HDB_WLOCK);
245 tag.data = HDB_DB_FORMAT_ENTRY;
246 tag.length = strlen(tag.data);
247 snprintf(ver, sizeof(ver), "%u", HDB_DB_FORMAT);
249 version.length = strlen(version.data) + 1; /* zero terminated */
250 ret = (*db->hdb__put)(context, db, 0, tag, version);
251 ret2 = db->hdb_unlock(context, db);
254 krb5_clear_error_message(context);
263 * Load a dynamic backend from /usr/heimdal/lib/hdb_NAME.so,
264 * looking for the hdb_NAME_create symbol.
267 static const struct hdb_method *
268 find_dynamic_method (krb5_context context,
269 const char *filename,
272 static struct hdb_method method;
273 struct hdb_so_method *mso;
274 char *prefix, *path, *symbol;
279 p = strchr(filename, ':');
281 /* if no prefix, don't know what module to load, just ignore it */
286 *rest = filename + len + 1;
288 prefix = malloc(len + 1);
290 krb5_errx(context, 1, "out of memory");
291 strlcpy(prefix, filename, len + 1);
293 if (asprintf(&path, LIBDIR "/hdb_%s.so", prefix) == -1)
294 krb5_errx(context, 1, "out of memory");
300 #define RTLD_GLOBAL 0
303 dl = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
305 krb5_warnx(context, "error trying to load dynamic module %s: %s\n",
312 if (asprintf(&symbol, "hdb_%s_interface", prefix) == -1)
313 krb5_errx(context, 1, "out of memory");
315 mso = dlsym(dl, symbol);
317 krb5_warnx(context, "error finding symbol %s in %s: %s\n",
318 symbol, path, dlerror());
328 if (mso->version != HDB_INTERFACE_VERSION) {
330 "error wrong version in shared module %s "
331 "version: %d should have been %d\n",
332 prefix, mso->version, HDB_INTERFACE_VERSION);
338 if (mso->create == NULL) {
339 krb5_errx(context, 1,
340 "no entry point function in shared mod %s ",
347 method.create = mso->create;
348 method.prefix = prefix;
352 #endif /* HAVE_DLOPEN */
355 * find the relevant method for `filename', returning a pointer to the
357 * return NULL if there's no such method.
360 static const struct hdb_method *
361 find_method (const char *filename, const char **rest)
363 const struct hdb_method *h;
365 for (h = methods; h->prefix != NULL; ++h) {
366 if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0) {
367 *rest = filename + strlen(h->prefix);
371 #if defined(HAVE_DB1) || defined(HAVE_DB3) || defined(HAVE_NDBM)
372 if (strncmp(filename, "/", 1) == 0
373 || strncmp(filename, "./", 2) == 0
374 || strncmp(filename, "../", 3) == 0)
385 hdb_list_builtin(krb5_context context, char **list)
387 const struct hdb_method *h;
391 for (h = methods; h->prefix != NULL; ++h) {
392 if (h->prefix[0] == '\0')
394 len += strlen(h->prefix) + 2;
400 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
405 for (h = methods; h->prefix != NULL; ++h) {
407 strlcat(buf, ", ", len);
408 strlcat(buf, h->prefix, len);
415 * Create a handle for a Kerberos database
417 * Create a handle for a Kerberos database backend specified by a
418 * filename. Doesn't create a file if its doesn't exists, you have to
419 * use O_CREAT to tell the backend to create the file.
423 hdb_create(krb5_context context, HDB **db, const char *filename)
425 const struct hdb_method *h;
426 const char *residual;
428 struct krb5_plugin *list = NULL, *e;
431 filename = HDB_DEFAULT_DB;
432 krb5_add_et_list(context, initialize_hdb_error_table_r);
433 h = find_method (filename, &residual);
436 ret = _krb5_plugin_find(context, PLUGIN_TYPE_DATA, "hdb", &list);
437 if(ret == 0 && list != NULL) {
438 for (e = list; e != NULL; e = _krb5_plugin_get_next(e)) {
439 h = _krb5_plugin_get_symbol(e);
440 if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0
441 && h->interface_version == HDB_INTERFACE_VERSION) {
442 residual = filename + strlen(h->prefix);
448 _krb5_plugin_free(list);
455 h = find_dynamic_method (context, filename, &residual);
458 krb5_errx(context, 1, "No database support for %s", filename);
459 return (*h->create)(context, db, residual);